Release 4.14 arch/x86/kvm/emulate.c

/******************************************************************************
 * emulate.c
 *
 * Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
 *
 * Copyright (c) 2005 Keir Fraser
 *
 * Linux coding style, mod r/m decoder, segment base fixes, real-mode
 * privileged instructions:
 *
 * Copyright (C) 2006 Qumranet
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 *
 *   Avi Kivity <avi@qumranet.com>
 *   Yaniv Kamay <yaniv@qumranet.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
 */

#include <linux/kvm_host.h>
#include "kvm_cache_regs.h"
#include <asm/kvm_emulate.h>
#include <linux/stringify.h>
#include <asm/debugreg.h>

#include "x86.h"
#include "tss.h"
#include "mmu.h"

/*
 * Operand types
 */

#define OpNone             0ull

#define OpImplicit         1ull  
/* No generic decode */

#define OpReg              2ull  
/* Register */

#define OpMem              3ull  
/* Memory */

#define OpAcc              4ull  
/* Accumulator: AL/AX/EAX/RAX */

#define OpDI               5ull  
/* ES:DI/EDI/RDI */

#define OpMem64            6ull  
/* Memory, 64-bit */

#define OpImmUByte         7ull  
/* Zero-extended 8-bit immediate */

#define OpDX               8ull  
/* DX register */

#define OpCL               9ull  
/* CL register (for shifts) */

#define OpImmByte         10ull  
/* 8-bit sign extended immediate */

#define OpOne             11ull  
/* Implied 1 */

#define OpImm             12ull  
/* Sign extended up to 32-bit immediate */

#define OpMem16           13ull  
/* Memory operand (16-bit). */

#define OpMem32           14ull  
/* Memory operand (32-bit). */

#define OpImmU            15ull  
/* Immediate operand, zero extended */

#define OpSI              16ull  
/* SI/ESI/RSI */

#define OpImmFAddr        17ull  
/* Immediate far address */

#define OpMemFAddr        18ull  
/* Far address in memory */

#define OpImmU16          19ull  
/* Immediate operand, 16 bits, zero extended */

#define OpES              20ull  
/* ES */

#define OpCS              21ull  
/* CS */

#define OpSS              22ull  
/* SS */

#define OpDS              23ull  
/* DS */

#define OpFS              24ull  
/* FS */

#define OpGS              25ull  
/* GS */

#define OpMem8            26ull  
/* 8-bit zero extended memory operand */

#define OpImm64           27ull  
/* Sign extended 16/32/64-bit immediate */

#define OpXLat            28ull  
/* memory at BX/EBX/RBX + zero-extended AL */

#define OpAccLo           29ull  
/* Low part of extended acc (AX/AX/EAX/RAX) */

#define OpAccHi           30ull  
/* High part of extended acc (-/DX/EDX/RDX) */


#define OpBits             5  
/* Width of operand field */

#define OpMask             ((1ull << OpBits) - 1)

/*
 * Opcode effective-address decode tables.
 * Note that we only emulate instructions that have at least one memory
 * operand (excluding implicit stack references). We assume that stack
 * references and instruction fetches will never occur in special memory
 * areas that require emulation. So, for example, 'mov <imm>,<reg>' need
 * not be handled.
 */

/* Operand sizes: 8-bit operands or specified/overridden size. */

#define ByteOp      (1<<0)	
/* 8-bit operands. */
/* Destination operand type. */

#define DstShift    1

#define ImplicitOps (OpImplicit << DstShift)

#define DstReg      (OpReg << DstShift)

#define DstMem      (OpMem << DstShift)

#define DstAcc      (OpAcc << DstShift)

#define DstDI       (OpDI << DstShift)

#define DstMem64    (OpMem64 << DstShift)

#define DstMem16    (OpMem16 << DstShift)

#define DstImmUByte (OpImmUByte << DstShift)

#define DstDX       (OpDX << DstShift)

#define DstAccLo    (OpAccLo << DstShift)

#define DstMask     (OpMask << DstShift)
/* Source operand type. */

#define SrcShift    6

#define SrcNone     (OpNone << SrcShift)

#define SrcReg      (OpReg << SrcShift)

#define SrcMem      (OpMem << SrcShift)

#define SrcMem16    (OpMem16 << SrcShift)

#define SrcMem32    (OpMem32 << SrcShift)

#define SrcImm      (OpImm << SrcShift)

#define SrcImmByte  (OpImmByte << SrcShift)

#define SrcOne      (OpOne << SrcShift)

#define SrcImmUByte (OpImmUByte << SrcShift)

#define SrcImmU     (OpImmU << SrcShift)

#define SrcSI       (OpSI << SrcShift)

#define SrcXLat     (OpXLat << SrcShift)

#define SrcImmFAddr (OpImmFAddr << SrcShift)

#define SrcMemFAddr (OpMemFAddr << SrcShift)

#define SrcAcc      (OpAcc << SrcShift)

#define SrcImmU16   (OpImmU16 << SrcShift)

#define SrcImm64    (OpImm64 << SrcShift)

#define SrcDX       (OpDX << SrcShift)

#define SrcMem8     (OpMem8 << SrcShift)

#define SrcAccHi    (OpAccHi << SrcShift)

#define SrcMask     (OpMask << SrcShift)

#define BitOp       (1<<11)

#define MemAbs      (1<<12)      
/* Memory operand is absolute displacement */

#define String      (1<<13)     
/* String instruction (rep capable) */

#define Stack       (1<<14)     
/* Stack instruction (push/pop) */

#define GroupMask   (7<<15)     
/* Opcode uses one of the group mechanisms */

#define Group       (1<<15)     
/* Bits 3:5 of modrm byte extend opcode */

#define GroupDual   (2<<15)     
/* Alternate decoding of mod == 3 */

#define Prefix      (3<<15)     
/* Instruction varies with 66/f2/f3 prefix */

#define RMExt       (4<<15)     
/* Opcode extension in ModRM r/m if mod == 3 */

#define Escape      (5<<15)     
/* Escape to coprocessor instruction */

#define InstrDual   (6<<15)     
/* Alternate instruction decoding of mod == 3 */

#define ModeDual    (7<<15)     
/* Different instruction for 32/64 bit */

#define Sse         (1<<18)     
/* SSE Vector instruction */
/* Generic ModRM decode. */

#define ModRM       (1<<19)
/* Destination is only written; never read. */

#define Mov         (1<<20)
/* Misc flags */

#define Prot        (1<<21) 
/* instruction generates #UD if not in prot-mode */

#define EmulateOnUD (1<<22) 
/* Emulate if unsupported by the host */

#define NoAccess    (1<<23) 
/* Don't access memory (lea/invlpg/verr etc) */

#define Op3264      (1<<24) 
/* Operand is 64b in long mode, 32b otherwise */

#define Undefined   (1<<25) 
/* No Such Instruction */

#define Lock        (1<<26) 
/* lock prefix is allowed for the instruction */

#define Priv        (1<<27) 
/* instruction generates #GP if current CPL != 0 */

#define No64	    (1<<28)

#define PageTable   (1 << 29)   
/* instruction used to write page table */

#define NotImpl     (1 << 30)   
/* instruction is not implemented */
/* Source 2 operand type */

#define Src2Shift   (31)

#define Src2None    (OpNone << Src2Shift)

#define Src2Mem     (OpMem << Src2Shift)

#define Src2CL      (OpCL << Src2Shift)

#define Src2ImmByte (OpImmByte << Src2Shift)

#define Src2One     (OpOne << Src2Shift)

#define Src2Imm     (OpImm << Src2Shift)

#define Src2ES      (OpES << Src2Shift)

#define Src2CS      (OpCS << Src2Shift)

#define Src2SS      (OpSS << Src2Shift)

#define Src2DS      (OpDS << Src2Shift)

#define Src2FS      (OpFS << Src2Shift)

#define Src2GS      (OpGS << Src2Shift)

#define Src2Mask    (OpMask << Src2Shift)

#define Mmx         ((u64)1 << 40)  
/* MMX Vector instruction */

#define AlignMask   ((u64)7 << 41)

#define Aligned     ((u64)1 << 41)  
/* Explicitly aligned (e.g. MOVDQA) */

#define Unaligned   ((u64)2 << 41)  
/* Explicitly unaligned (e.g. MOVDQU) */

#define Avx         ((u64)3 << 41)  
/* Advanced Vector Extensions */

#define Aligned16   ((u64)4 << 41)  
/* Aligned to 16 byte boundary (e.g. FXSAVE) */

#define Fastop      ((u64)1 << 44)  
/* Use opcode::u.fastop */

#define NoWrite     ((u64)1 << 45)  
/* No writeback */

#define SrcWrite    ((u64)1 << 46)  
/* Write back src operand */

#define NoMod	    ((u64)1 << 47)  
/* Mod field is ignored */

#define Intercept   ((u64)1 << 48)  
/* Has valid intercept field */

#define CheckPerm   ((u64)1 << 49)  
/* Has valid check_perm field */

#define PrivUD      ((u64)1 << 51)  
/* #UD instead of #GP on CPL > 0 */

#define NearBranch  ((u64)1 << 52)  
/* Near branches */

#define No16	    ((u64)1 << 53)  
/* No 16 bit operand */

#define IncSP       ((u64)1 << 54)  
/* SP is incremented before ModRM calc */

#define TwoMemOp    ((u64)1 << 55)  
/* Instruction has two memory operand */


#define DstXacc     (DstAccLo | SrcAccHi | SrcWrite)


#define X2(x...) x, x

#define X3(x...) X2(x), x

#define X4(x...) X2(x), X2(x)

#define X5(x...) X4(x), x

#define X6(x...) X4(x), X2(x)

#define X7(x...) X4(x), X3(x)

#define X8(x...) X4(x), X4(x)

#define X16(x...) X8(x), X8(x)


#define NR_FASTOP (ilog2(sizeof(ulong)) + 1)

#define FASTOP_SIZE 8

/*
 * fastop functions have a special calling convention:
 *
 * dst:    rax        (in/out)
 * src:    rdx        (in/out)
 * src2:   rcx        (in)
 * flags:  rflags     (in/out)
 * ex:     rsi        (in:fastop pointer, out:zero if exception)
 *
 * Moreover, they are all exactly FASTOP_SIZE bytes long, so functions for
 * different operand sizes can be reached by calculation, rather than a jump
 * table (which would be bigger than the code).
 *
 * fastop functions are declared as taking a never-defined fastop parameter,
 * so they can't be called from C directly.
 */

struct fastop;


struct opcode {
	
u64 flags : 56;
	
u64 intercept : 8;
	union {
		
int (*execute)(struct x86_emulate_ctxt *ctxt);
		
const struct opcode *group;
		
const struct group_dual *gdual;
		
const struct gprefix *gprefix;
		
const struct escape *esc;
		
const struct instr_dual *idual;
		
const struct mode_dual *mdual;
		
void (*fastop)(struct fastop *fake);
	
} u;
	
int (*check_perm)(struct x86_emulate_ctxt *ctxt);
};


struct group_dual {
	
struct opcode mod012[8];
	
struct opcode mod3[8];
};


struct gprefix {
	
struct opcode pfx_no;
	
struct opcode pfx_66;
	
struct opcode pfx_f2;
	
struct opcode pfx_f3;
};


struct escape {
	
struct opcode op[8];
	
struct opcode high[64];
};


struct instr_dual {
	
struct opcode mod012;
	
struct opcode mod3;
};


struct mode_dual {
	
struct opcode mode32;
	
struct opcode mode64;
};


#define EFLG_RESERVED_ZEROS_MASK 0xffc0802a


enum x86_transfer_type {
	
X86_TRANSFER_NONE,
	
X86_TRANSFER_CALL_JMP,
	
X86_TRANSFER_RET,
	
X86_TRANSFER_TASK_SWITCH,
};



static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr)
{
	if (!(ctxt->regs_valid & (1 << nr))) {
		ctxt->regs_valid |= 1 << nr;
		ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr);
	}
	return ctxt->_regs[nr];
}

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static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr)
{
	ctxt->regs_valid |= 1 << nr;
	ctxt->regs_dirty |= 1 << nr;
	return &ctxt->_regs[nr];
}

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static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr)
{
	reg_read(ctxt, nr);
	return reg_write(ctxt, nr);
}

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static void writeback_registers(struct x86_emulate_ctxt *ctxt)
{
	unsigned reg;

	for_each_set_bit(reg, (ulong *)&ctxt->regs_dirty, 16)
		ctxt->ops->write_gpr(ctxt, reg, ctxt->_regs[reg]);
}

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static void invalidate_registers(struct x86_emulate_ctxt *ctxt)
{
	ctxt->regs_dirty = 0;
	ctxt->regs_valid = 0;
}

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/*
 * These EFLAGS bits are restored from saved value during emulation, and
 * any changes are written back to the saved value after emulation.
 */

#define EFLAGS_MASK (X86_EFLAGS_OF|X86_EFLAGS_SF|X86_EFLAGS_ZF|X86_EFLAGS_AF|\
                     X86_EFLAGS_PF|X86_EFLAGS_CF)

#ifdef CONFIG_X86_64

#define ON64(x) x
#else

#define ON64(x)
#endif

static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));


#define FOP_FUNC(name) \
	".align " __stringify(FASTOP_SIZE) " \n\t" \
        ".type " name ", @function \n\t" \
        name ":\n\t"


#define FOP_RET   "ret \n\t"


#define FOP_START(op) \
	extern void em_##op(struct fastop *fake); \
        asm(".pushsection .text, \"ax\" \n\t" \
            ".global em_" #op " \n\t" \
            FOP_FUNC("em_" #op)


#define FOP_END \
	    ".popsection")


#define FOPNOP() \
	FOP_FUNC(__stringify(__UNIQUE_ID(nop))) \
        FOP_RET


#define FOP1E(op,  dst) \
	FOP_FUNC(#op "_" #dst) \
        "10: " #op " %" #dst " \n\t" FOP_RET


#define FOP1EEX(op,  dst) \
	FOP1E(op, dst) _ASM_EXTABLE(10b, kvm_fastop_exception)


#define FASTOP1(op) \
	FOP_START(op) \
        FOP1E(op##b, al) \
        FOP1E(op##w, ax) \
        FOP1E(op##l, eax) \
        ON64(FOP1E(op##q, rax)) \
        FOP_END

/* 1-operand, using src2 (for MUL/DIV r/m) */

#define FASTOP1SRC2(op, name) \
	FOP_START(name) \
        FOP1E(op, cl) \
        FOP1E(op, cx) \
        FOP1E(op, ecx) \
        ON64(FOP1E(op, rcx)) \
        FOP_END

/* 1-operand, using src2 (for MUL/DIV r/m), with exceptions */

#define FASTOP1SRC2EX(op, name) \
	FOP_START(name) \
        FOP1EEX(op, cl) \
        FOP1EEX(op, cx) \
        FOP1EEX(op, ecx) \
        ON64(FOP1EEX(op, rcx)) \
        FOP_END


#define FOP2E(op,  dst, src)	   \
	FOP_FUNC(#op "_" #dst "_" #src) \
        #op " %" #src ", %" #dst " \n\t" FOP_RET


#define FASTOP2(op) \
	FOP_START(op) \
        FOP2E(op##b, al, dl) \
        FOP2E(op##w, ax, dx) \
        FOP2E(op##l, eax, edx) \
        ON64(FOP2E(op##q, rax, rdx)) \
        FOP_END

/* 2 operand, word only */

#define FASTOP2W(op) \
	FOP_START(op) \
        FOPNOP() \
        FOP2E(op##w, ax, dx) \
        FOP2E(op##l, eax, edx) \
        ON64(FOP2E(op##q, rax, rdx)) \
        FOP_END

/* 2 operand, src is CL */

#define FASTOP2CL(op) \
	FOP_START(op) \
        FOP2E(op##b, al, cl) \
        FOP2E(op##w, ax, cl) \
        FOP2E(op##l, eax, cl) \
        ON64(FOP2E(op##q, rax, cl)) \
        FOP_END

/* 2 operand, src and dest are reversed */

#define FASTOP2R(op, name) \
	FOP_START(name) \
        FOP2E(op##b, dl, al) \
        FOP2E(op##w, dx, ax) \
        FOP2E(op##l, edx, eax) \
        ON64(FOP2E(op##q, rdx, rax)) \
        FOP_END


#define FOP3E(op,  dst, src, src2) \
	FOP_FUNC(#op "_" #dst "_" #src "_" #src2) \
        #op " %" #src2 ", %" #src ", %" #dst " \n\t" FOP_RET

/* 3-operand, word-only, src2=cl */

#define FASTOP3WCL(op) \
	FOP_START(op) \
        FOPNOP() \
        FOP3E(op##w, ax, dx, cl) \
        FOP3E(op##l, eax, edx, cl) \
        ON64(FOP3E(op##q, rax, rdx, cl)) \
        FOP_END

/* Special case for SETcc - 1 instruction per cc */

#define FOP_SETCC(op) \
	".align 4 \n\t" \
        ".type " #op ", @function \n\t" \
        #op ": \n\t" \
        #op " %al \n\t" \
        FOP_RET

asm(".pushsection .fixup, \"ax\"\n"
    ".global kvm_fastop_exception \n"
    "kvm_fastop_exception: xor %esi, %esi; ret\n"
    ".popsection");

FOP_START(setcc)
FOP_SETCC(seto)
FOP_SETCC(setno)
FOP_SETCC(setc)
FOP_SETCC(setnc)
FOP_SETCC(setz)
FOP_SETCC(setnz)
FOP_SETCC(setbe)
FOP_SETCC(setnbe)
FOP_SETCC(sets)
FOP_SETCC(setns)
FOP_SETCC(setp)
FOP_SETCC(setnp)
FOP_SETCC(setl)
FOP_SETCC(setnl)
FOP_SETCC(setle)
FOP_SETCC(setnle)
FOP_END;

FOP_START(salc) "pushf; sbb %al, %al; popf \n\t" FOP_RET

FOP_END;

/*
 * XXX: inoutclob user must know where the argument is being expanded.
 *      Relying on CC_HAVE_ASM_GOTO would allow us to remove _fault.
 */

#define asm_safe(insn, inoutclob...) \
({ \
        int _fault = 0; \
 \
        asm volatile("1:" insn "\n" \
                     "2:\n" \
                     ".pushsection .fixup, \"ax\"\n" \
                     "3: movl $1, %[_fault]\n" \
                     "   jmp  2b\n" \
                     ".popsection\n" \
                     _ASM_EXTABLE(1b, 3b) \
                     : [_fault] "+qm"(_fault) inoutclob ); \
 \
        _fault ? X86EMUL_UNHANDLEABLE : X86EMUL_CONTINUE; \
})



static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt,
				    enum x86_intercept intercept,
				    enum x86_intercept_stage stage)
{
	struct x86_instruction_info info = {
		.intercept  = intercept,
		.rep_prefix = ctxt->rep_prefix,
		.modrm_mod  = ctxt->modrm_mod,
		.modrm_reg  = ctxt->modrm_reg,
		.modrm_rm   = ctxt->modrm_rm,
		.src_val    = ctxt->src.val64,
		.dst_val    = ctxt->dst.val64,
		.src_bytes  = ctxt->src.bytes,
		.dst_bytes  = ctxt->dst.bytes,
		.ad_bytes   = ctxt->ad_bytes,
		.next_rip   = ctxt->eip,
        };

	return ctxt->ops->intercept(ctxt, &info, stage);
}

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static void assign_masked(ulong *dest, ulong src, ulong mask)
{
	*dest = (*dest & ~mask) | (src & mask);
}

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static void assign_register(unsigned long *reg, u64 val, int bytes)
{
	/* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */
	switch (bytes) {
	case 1:
		*(u8 *)reg = (u8)val;
		break;
	case 2:
		*(u16 *)reg = (u16)val;
		break;
	case 4:
		*reg = (u32)val;
		break;	/* 64b: zero-extend */
	case 8:
		*reg = val;
		break;
	}
}

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static inline unsigned long ad_mask(struct x86_emulate_ctxt *ctxt)
{
	return (1UL << (ctxt->ad_bytes << 3)) - 1;
}

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static ulong stack_mask(struct x86_emulate_ctxt *ctxt)
{
	u16 sel;
	struct desc_struct ss;

	if (ctxt->mode == X86EMUL_MODE_PROT64)
		return ~0UL;
	ctxt->ops->get_segment(ctxt, &sel, &ss, NULL, VCPU_SREG_SS);
	return ~0U >> ((ss.d ^ 1) * 16);  /* d=0: 0xffff; d=1: 0xffffffff */
}

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static int stack_size(struct x86_emulate_ctxt *ctxt)
{
	return (__fls(stack_mask(ctxt)) + 1) >> 3;
}

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/* Access/update address held in a register, based on addressing mode. */

static inline unsigned long

address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg)
{
	if (ctxt->ad_bytes == sizeof(unsigned long))
		return reg;
	else
		return reg & ad_mask(ctxt);
}

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static inline unsigned long

register_address(struct x86_emulate_ctxt *ctxt, int reg)
{
	return address_mask(ctxt, reg_read(ctxt, reg));
}

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static void masked_increment(ulong *reg, ulong mask, int inc)
{
	assign_masked(reg, *reg + inc, mask);
}

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Avi Kivity
28
100.00%
1
100.00%
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28
100.00%
1
100.00%


static inline void

register_address_increment(struct x86_emulate_ctxt *ctxt, int reg, int inc)
{
	ulong *preg = reg_rmw(ctxt, reg);

	assign_register(preg, *preg + inc, ctxt->ad_bytes);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
23
53.49%
3
60.00%
Nadav Amit
14
32.56%
1
20.00%
Paolo Bonzini
6
13.95%
1
20.00%
Total
43
100.00%
5
100.00%



static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc)
{
	masked_increment(reg_rmw(ctxt, VCPU_REGS_RSP), stack_mask(ctxt), inc);
}

Contributors
Person
Tokens
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Avi Kivity
31
100.00%
5
100.00%
Total
31
100.00%
5
100.00%



static u32 desc_limit_scaled(struct desc_struct *desc)
{
	u32 limit = get_desc_limit(desc);

	return desc->g ? (limit << 12) | 0xfff : limit;
}

Contributors
Person
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Avi Kivity
34
100.00%
1
100.00%
Total
34
100.00%
1
100.00%



static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg)
{
	if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS)
		return 0;

	return ctxt->ops->get_cached_segment_base(ctxt, seg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
40
95.24%
2
66.67%
Takuya Yoshikawa
2
4.76%
1
33.33%
Total
42
100.00%
3
100.00%



static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec,
			     u32 error, bool valid)
{
	WARN_ON(vec > 0x1f);
	ctxt->exception.vector = vec;
	ctxt->exception.error_code = error;
	ctxt->exception.error_code_valid = valid;
	return X86EMUL_PROPAGATE_FAULT;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
47
87.04%
3
75.00%
Paolo Bonzini
7
12.96%
1
25.00%
Total
54
100.00%
4
100.00%



static int emulate_db(struct x86_emulate_ctxt *ctxt)
{
	return emulate_exception(ctxt, DB_VECTOR, 0, false);
}

Contributors
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Joerg Roedel
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%



static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err)
{
	return emulate_exception(ctxt, GP_VECTOR, err, true);
}

Contributors
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Avi Kivity
26
100.00%
3
100.00%
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26
100.00%
3
100.00%



static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err)
{
	return emulate_exception(ctxt, SS_VECTOR, err, true);
}

Contributors
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Avi Kivity
26
100.00%
1
100.00%
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26
100.00%
1
100.00%



static int emulate_ud(struct x86_emulate_ctxt *ctxt)
{
	return emulate_exception(ctxt, UD_VECTOR, 0, false);
}

Contributors
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Avi Kivity
23
100.00%
3
100.00%
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23
100.00%
3
100.00%



static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err)
{
	return emulate_exception(ctxt, TS_VECTOR, err, true);
}

Contributors
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Avi Kivity
26
100.00%
3
100.00%
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26
100.00%
3
100.00%



static int emulate_de(struct x86_emulate_ctxt *ctxt)
{
	return emulate_exception(ctxt, DE_VECTOR, 0, false);
}

Contributors
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Avi Kivity
23
100.00%
2
100.00%
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23
100.00%
2
100.00%



static int emulate_nm(struct x86_emulate_ctxt *ctxt)
{
	return emulate_exception(ctxt, NM_VECTOR, 0, false);
}

Contributors
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Avi Kivity
23
100.00%
1
100.00%
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23
100.00%
1
100.00%



static u16 get_segment_selector(struct x86_emulate_ctxt *ctxt, unsigned seg)
{
	u16 selector;
	struct desc_struct desc;

	ctxt->ops->get_segment(ctxt, &selector, &desc, NULL, seg);
	return selector;
}

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Avi Kivity
43
100.00%
1
100.00%
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43
100.00%
1
100.00%



static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector,
				 unsigned seg)
{
	u16 dummy;
	u32 base3;
	struct desc_struct desc;

	ctxt->ops->get_segment(ctxt, &dummy, &desc, &base3, seg);
	ctxt->ops->set_segment(ctxt, selector, &desc, base3, seg);
}

Contributors
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Avi Kivity
65
100.00%
1
100.00%
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65
100.00%
1
100.00%

/*
 * x86 defines three classes of vector instructions: explicitly
 * aligned, explicitly unaligned, and the rest, which change behaviour
 * depending on whether they're AVX encoded or not.
 *
 * Also included is CMPXCHG16B which is not a vector instruction, yet it is
 * subject to the same check.  FXSAVE and FXRSTOR are checked here too as their
 * 512 bytes of data must be aligned to a 16 byte boundary.
 */


static unsigned insn_alignment(struct x86_emulate_ctxt *ctxt, unsigned size)
{
	u64 alignment = ctxt->d & AlignMask;

	if (likely(size < 16))
		return 1;

	switch (alignment) {
	case Unaligned:
	case Avx:
		return 1;
	case Aligned16:
		return 16;
	case Aligned:
	default:
		return size;
	}
}

Contributors
Person
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CommitProp
Avi Kivity
33
52.38%
1
33.33%
Radim Krčmář
30
47.62%
2
66.67%
Total
63
100.00%
3
100.00%



static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,
				       struct segmented_address addr,
				       unsigned *max_size, unsigned size,
				       bool write, bool fetch,
				       enum x86emul_mode mode, ulong *linear)
{
	struct desc_struct desc;
	bool usable;
	ulong la;
	u32 lim;
	u16 sel;
	u8  va_bits;

	la = seg_base(ctxt, addr.seg) + addr.ea;
	*max_size = 0;
	switch (mode) {
	case X86EMUL_MODE_PROT64:
		*linear = la;
		va_bits = ctxt_virt_addr_bits(ctxt);
		if (get_canonical(la, va_bits) != la)
			goto bad;

		*max_size = min_t(u64, ~0u, (1ull << va_bits) - la);
		if (size > *max_size)
			goto bad;
		break;
	default:
		*linear = la = (u32)la;
		usable = ctxt->ops->get_segment(ctxt, &sel, &desc, NULL,
						addr.seg);
		if (!usable)
			goto bad;
		/* code segment in protected mode or read-only data segment */
		if ((((ctxt->mode != X86EMUL_MODE_REAL) && (desc.type & 8))
					|| !(desc.type & 2)) && write)
			goto bad;
		/* unreadable code segment */
		if (!fetch && (desc.type & 8) && !(desc.type & 2))
			goto bad;
		lim = desc_limit_scaled(&desc);
		if (!(desc.type & 8) && (desc.type & 4)) {
			/* expand-down segment */
			if (addr.ea <= lim)
				goto bad;
			lim = desc.d ? 0xffffffff : 0xffff;
		}
		if (addr.ea > lim)
			goto bad;
		if (lim == 0xffffffff)
			*max_size = ~0u;
		else {
			*max_size = (u64)lim + 1 - addr.ea;
			if (size > *max_size)
				goto bad;
		}
		break;
	}
	if (la & (insn_alignment(ctxt, size) - 1))
		return emulate_gp(ctxt, 0);
	return X86EMUL_CONTINUE;
bad:
	if (addr.seg == VCPU_SREG_SS)
		return emulate_ss(ctxt, 0);
	else
		return emulate_gp(ctxt, 0);
}

Contributors
Person
Tokens
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CommitProp
Avi Kivity
259
64.59%
6
28.57%
Paolo Bonzini
79
19.70%
5
23.81%
Nadav Amit
24
5.99%
5
23.81%
Yu Zhang
16
3.99%
1
4.76%
Gleb Natapov
11
2.74%
1
4.76%
Nelson Elhage
7
1.75%
1
4.76%
Radim Krčmář
4
1.00%
1
4.76%
Guo Chao
1
0.25%
1
4.76%
Total
401
100.00%
21
100.00%



static int linearize(struct x86_emulate_ctxt *ctxt,
		     struct segmented_address addr,
		     unsigned size, bool write,
		     ulong *linear)
{
	unsigned max_size;
	return __linearize(ctxt, addr, &max_size, size, write, false,
			   ctxt->mode, linear);
}

Contributors
Person
Tokens
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CommitProp
Nelson Elhage
37
72.55%
1
25.00%
Nadav Amit
8
15.69%
1
25.00%
Paolo Bonzini
5
9.80%
1
25.00%
Avi Kivity
1
1.96%
1
25.00%
Total
51
100.00%
4
100.00%



static inline int assign_eip(struct x86_emulate_ctxt *ctxt, ulong dst,
			     enum x86emul_mode mode)
{
	ulong linear;
	int rc;
	unsigned max_size;
	struct segmented_address addr = { .seg = VCPU_SREG_CS,
					   .ea = dst };

	if (ctxt->op_bytes != sizeof(unsigned long))
		addr.ea = dst & ((1UL << (ctxt->op_bytes << 3)) - 1);
	rc = __linearize(ctxt, addr, &max_size, 1, false, true, mode, &linear);
	if (rc == X86EMUL_CONTINUE)
		ctxt->_eip = addr.ea;
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nadav Amit
102
86.44%
1
33.33%
Avi Kivity
14
11.86%
1
33.33%
Nelson Elhage
2
1.69%
1
33.33%
Total
118
100.00%
3
100.00%



static inline int assign_eip_near(struct x86_emulate_ctxt *ctxt, ulong dst)
{
	return assign_eip(ctxt, dst, ctxt->mode);
}

Contributors
Person
Tokens
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CommitProp
Nadav Amit
24
88.89%
1
50.00%
Nelson Elhage
3
11.11%
1
50.00%
Total
27
100.00%
2
100.00%



static int assign_eip_far(struct x86_emulate_ctxt *ctxt, ulong dst,
			  const struct desc_struct *cs_desc)
{
	enum x86emul_mode mode = ctxt->mode;
	int rc;

#ifdef CONFIG_X86_64
	if (ctxt->mode >= X86EMUL_MODE_PROT16) {
		if (cs_desc->l) {
			u64 efer = 0;

			ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
			if (efer & EFER_LMA)
				mode = X86EMUL_MODE_PROT64;
		} else
			mode = X86EMUL_MODE_PROT32; /* temporary value */
	}
#endif
	if (mode == X86EMUL_MODE_PROT16 || mode == X86EMUL_MODE_PROT32)
		mode = cs_desc->d ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
	rc = assign_eip(ctxt, dst, mode);
	if (rc == X86EMUL_CONTINUE)
		ctxt->mode = mode;
	return rc;
}

Contributors
Person
Tokens
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Commits
CommitProp
Nadav Amit
112
82.96%
2
33.33%
Avi Kivity
23
17.04%
4
66.67%
Total
135
100.00%
6
100.00%



static inline int jmp_rel(struct x86_emulate_ctxt *ctxt, int rel)
{
	return assign_eip_near(ctxt, ctxt->_eip + rel);
}

Contributors
Person
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CommitProp
Nelson Elhage
17
62.96%
1
50.00%
Nadav Amit
10
37.04%
1
50.00%
Total
27
100.00%
2
100.00%



static int segmented_read_std(struct x86_emulate_ctxt *ctxt,
			      struct segmented_address addr,
			      void *data,
			      unsigned size)
{
	int rc;
	ulong linear;

	rc = linearize(ctxt, addr, size, false, &linear);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	return ctxt->ops->read_std(ctxt, linear, data, size, &ctxt->exception);
}

Contributors
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Avi Kivity
74
100.00%
4
100.00%
Total
74
100.00%
4
100.00%



static int segmented_write_std(struct x86_emulate_ctxt *ctxt,
			       struct segmented_address addr,
			       void *data,
			       unsigned int size)
{
	int rc;
	ulong linear;

	rc = linearize(ctxt, addr, size, true, &linear);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	return ctxt->ops->write_std(ctxt, linear, data, size, &ctxt->exception);
}

Contributors
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Steve Rutherford
75
100.00%
1
100.00%
Total
75
100.00%
1
100.00%

/*
 * Prefetch the remaining bytes of the instruction without crossing page
 * boundary if they are not in fetch_cache yet.
 */


static int __do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt, int op_size)
{
	int rc;
	unsigned size, max_size;
	unsigned long linear;
	int cur_size = ctxt->fetch.end - ctxt->fetch.data;
	struct segmented_address addr = { .seg = VCPU_SREG_CS,
					   .ea = ctxt->eip + cur_size };

	/*
         * We do not know exactly how many bytes will be needed, and
         * __linearize is expensive, so fetch as much as possible.  We
         * just have to avoid going beyond the 15 byte limit, the end
         * of the segment, or the end of the page.
         *
         * __linearize is called with size 0 so that it does not do any
         * boundary check itself.  Instead, we use max_size to check
         * against op_size.
         */
	rc = __linearize(ctxt, addr, &max_size, 0, false, true, ctxt->mode,
			 &linear);
	if (unlikely(rc != X86EMUL_CONTINUE))
		return rc;

	size = min_t(unsigned, 15UL ^ cur_size, max_size);
	size = min_t(unsigned, size, PAGE_SIZE - offset_in_page(linear));

	/*
         * One instruction can only straddle two pages,
         * and one has been loaded at the beginning of
         * x86_decode_insn.  So, if not enough bytes
         * still, we must have hit the 15-byte boundary.
         */
	if (unlikely(size < op_size))
		return emulate_gp(ctxt, 0);

	rc = ctxt->ops->fetch(ctxt, linear, ctxt->fetch.end,
			      size, &ctxt->exception);
	if (unlikely(rc != X86EMUL_CONTINUE))
		return rc;
	ctxt->fetch.end += size;
	return X86EMUL_CONTINUE;
}

Contributors
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Paolo Bonzini
85
43.59%
5
33.33%
Avi Kivity
51
26.15%
4
26.67%
Nelson Elhage
46
23.59%
2
13.33%
Takuya Yoshikawa
9
4.62%
3
20.00%
Nadav Amit
4
2.05%
1
6.67%
Total
195
100.00%
15
100.00%



static __always_inline int do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt,
					       unsigned size)
{
	unsigned done_size = ctxt->fetch.end - ctxt->fetch.ptr;

	if (unlikely(done_size < size))
		return __do_insn_fetch_bytes(ctxt, size - done_size);
	else
		return X86EMUL_CONTINUE;
}

Contributors
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Paolo Bonzini
22
41.51%
4
57.14%
Avi Kivity
20
37.74%
2
28.57%
Nadav Amit
11
20.75%
1
14.29%
Total
53
100.00%
7
100.00%

/* Fetch next part of the instruction being emulated. */

#define insn_fetch(_type, _ctxt)					\
({      _type _x;                                                       \
                                                                        \
        rc = do_insn_fetch_bytes(_ctxt, sizeof(_type));                 \
        if (rc != X86EMUL_CONTINUE)                                     \
                goto done;                                              \
        ctxt->_eip += sizeof(_type);                                    \
        memcpy(&_x, ctxt->fetch.ptr, sizeof(_type));                    \
        ctxt->fetch.ptr += sizeof(_type);                               \
        _x;                                                             \
})


#define insn_fetch_arr(_arr, _size, _ctxt)				\
({                                                                      \
        rc = do_insn_fetch_bytes(_ctxt, _size);                         \
        if (rc != X86EMUL_CONTINUE)                                     \
                goto done;                                              \
        ctxt->_eip += (_size);                                          \
        memcpy(_arr, ctxt->fetch.ptr, _size);                           \
        ctxt->fetch.ptr += (_size);                                     \
})

/*
 * Given the 'reg' portion of a ModRM byte, and a register block, return a
 * pointer into the block that addresses the relevant register.
 * @highbyte_regs specifies whether to decode AH,CH,DH,BH.
 */


static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg,
			     int byteop)
{
	void *p;
	int highbyte_regs = (ctxt->rex_prefix == 0) && byteop;

	if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8)
		p = (unsigned char *)reg_rmw(ctxt, modrm_reg & 3) + 1;
	else
		p = reg_rmw(ctxt, modrm_reg);
	return p;
}

Contributors
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Tokens
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CommitProp
Avi Kivity
64
82.05%
2
66.67%
Gleb Natapov
14
17.95%
1
33.33%
Total
78
100.00%
3
100.00%



static int read_descriptor(struct x86_emulate_ctxt *ctxt,
			   struct segmented_address addr,
			   u16 *size, unsigned long *address, int op_bytes)
{
	int rc;

	if (op_bytes == 2)
		op_bytes = 3;
	*address = 0;
	rc = segmented_read_std(ctxt, addr, size, 2);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	addr.ea += 2;
	rc = segmented_read_std(ctxt, addr, address, op_bytes);
	return rc;
}

Contributors
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Avi Kivity
89
100.00%
6
100.00%
Total
89
100.00%
6
100.00%


FASTOP2(add);

FASTOP2(or);

FASTOP2(adc);

FASTOP2(sbb);

FASTOP2(and);

FASTOP2(sub);

FASTOP2(xor);

FASTOP2(cmp);

FASTOP2(test);

FASTOP1SRC2(mul, mul_ex);
FASTOP1SRC2(imul, imul_ex);
FASTOP1SRC2EX(div, div_ex);
FASTOP1SRC2EX(idiv, idiv_ex);


FASTOP3WCL(shld);

FASTOP3WCL(shrd);


FASTOP2W(imul);


FASTOP1(not);

FASTOP1(neg);

FASTOP1(inc);

FASTOP1(dec);


FASTOP2CL(rol);

FASTOP2CL(ror);

FASTOP2CL(rcl);

FASTOP2CL(rcr);

FASTOP2CL(shl);

FASTOP2CL(shr);

FASTOP2CL(sar);


FASTOP2W(bsf);

FASTOP2W(bsr);

FASTOP2W(bt);

FASTOP2W(bts);

FASTOP2W(btr);

FASTOP2W(btc);


FASTOP2(xadd);

FASTOP2R(cmp, cmp_r);



static int em_bsf_c(struct x86_emulate_ctxt *ctxt)
{
	/* If src is zero, do not writeback, but update flags */
	if (ctxt->src.val == 0)
		ctxt->dst.type = OP_NONE;
	return fastop(ctxt, em_bsf);
}

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CommitProp
Nadav Amit
38
100.00%
1
100.00%
Total
38
100.00%
1
100.00%



static int em_bsr_c(struct x86_emulate_ctxt *ctxt)
{
	/* If src is zero, do not writeback, but update flags */
	if (ctxt->src.val == 0)
		ctxt->dst.type = OP_NONE;
	return fastop(ctxt, em_bsr);
}

Contributors
Person
Tokens
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Commits
CommitProp
Nadav Amit
38
100.00%
1
100.00%
Total
38
100.00%
1
100.00%



static __always_inline u8 test_cc(unsigned int condition, unsigned long flags)
{
	u8 rc;
	void (*fop)(void) = (void *)em_setcc + 4 * (condition & 0xf);

	flags = (flags & EFLAGS_MASK) | X86_EFLAGS_IF;
	asm("push %[flags]; popf; call *%[fastop]"
            : "=a"(rc) : [fastop]"r"(fop), [flags]"r"(flags));
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
54
98.18%
3
75.00%
Josh Poimboeuf
1
1.82%
1
25.00%
Total
55
100.00%
4
100.00%



static void fetch_register_operand(struct operand *op)
{
	switch (op->bytes) {
	case 1:
		op->val = *(u8 *)op->addr.reg;
		break;
	case 2:
		op->val = *(u16 *)op->addr.reg;
		break;
	case 4:
		op->val = *(u32 *)op->addr.reg;
		break;
	case 8:
		op->val = *(u64 *)op->addr.reg;
		break;
	}
}

Contributors
Person
Tokens
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Commits
CommitProp
Avi Kivity
95
100.00%
1
100.00%
Total
95
100.00%
1
100.00%



static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg)
{
	ctxt->ops->get_fpu(ctxt);
	switch (reg) {
	case 0: asm("movdqa %%xmm0, %0" : "=m"(*data)); break;
	case 1: asm("movdqa %%xmm1, %0" : "=m"(*data)); break;
	case 2: asm("movdqa %%xmm2, %0" : "=m"(*data)); break;
	case 3: asm("movdqa %%xmm3, %0" : "=m"(*data)); break;
	case 4: asm("movdqa %%xmm4, %0" : "=m"(*data)); break;
	case 5: asm("movdqa %%xmm5, %0" : "=m"(*data)); break;
	case 6: asm("movdqa %%xmm6, %0" : "=m"(*data)); break;
	case 7: asm("movdqa %%xmm7, %0" : "=m"(*data)); break;
#ifdef CONFIG_X86_64
	case 8: asm("movdqa %%xmm8, %0" : "=m"(*data)); break;
	case 9: asm("movdqa %%xmm9, %0" : "=m"(*data)); break;
	case 10: asm("movdqa %%xmm10, %0" : "=m"(*data)); break;
	case 11: asm("movdqa %%xmm11, %0" : "=m"(*data)); break;
	case 12: asm("movdqa %%xmm12, %0" : "=m"(*data)); break;
	case 13: asm("movdqa %%xmm13, %0" : "=m"(*data)); break;
	case 14: asm("movdqa %%xmm14, %0" : "=m"(*data)); break;
	case 15: asm("movdqa %%xmm15, %0" : "=m"(*data)); break;
#endif
	default: BUG();
	}
	ctxt->ops->put_fpu(ctxt);
}

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50.00%
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131
100.00%
2
100.00%



static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data,
			  int reg)
{
	ctxt->ops->get_fpu(ctxt);
	switch (reg) {
	case 0: asm("movdqa %0, %%xmm0" : : "m"(*data)); break;
	case 1: asm("movdqa %0, %%xmm1" : : "m"(*data)); break;
	case 2: asm("movdqa %0, %%xmm2" : : "m"(*data)); break;
	case 3: asm("movdqa %0, %%xmm3" : : "m"(*data)); break;
	case 4: asm("movdqa %0, %%xmm4" : : "m"(*data)); break;
	case 5: asm("movdqa %0, %%xmm5" : : "m"(*data)); break;
	case 6: asm("movdqa %0, %%xmm6" : : "m"(*data)); break;
	case 7: asm("movdqa %0, %%xmm7" : : "m"(*data)); break;
#ifdef CONFIG_X86_64
	case 8: asm("movdqa %0, %%xmm8" : : "m"(*data)); break;
	case 9: asm("movdqa %0, %%xmm9" : : "m"(*data)); break;
	case 10: asm("movdqa %0, %%xmm10" : : "m"(*data)); break;
	case 11: asm("movdqa %0, %%xmm11" : : "m"(*data)); break;
	case 12: asm("movdqa %0, %%xmm12" : : "m"(*data)); break;
	case 13: asm("movdqa %0, %%xmm13" : : "m"(*data)); break;
	case 14: asm("movdqa %0, %%xmm14" : : "m"(*data)); break;
	case 15: asm("movdqa %0, %%xmm15" : : "m"(*data)); break;
#endif
	default: BUG();
	}
	ctxt->ops->put_fpu(ctxt);
}

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115
87.79%
1
50.00%
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16
12.21%
1
50.00%
Total
131
100.00%
2
100.00%



static void read_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg)
{
	ctxt->ops->get_fpu(ctxt);
	switch (reg) {
	case 0: asm("movq %%mm0, %0" : "=m"(*data)); break;
	case 1: asm("movq %%mm1, %0" : "=m"(*data)); break;
	case 2: asm("movq %%mm2, %0" : "=m"(*data)); break;
	case 3: asm("movq %%mm3, %0" : "=m"(*data)); break;
	case 4: asm("movq %%mm4, %0" : "=m"(*data)); break;
	case 5: asm("movq %%mm5, %0" : "=m"(*data)); break;
	case 6: asm("movq %%mm6, %0" : "=m"(*data)); break;
	case 7: asm("movq %%mm7, %0" : "=m"(*data)); break;
	default: BUG();
	}
	ctxt->ops->put_fpu(ctxt);
}

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86
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1
100.00%



static void write_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg)
{
	ctxt->ops->get_fpu(ctxt);
	switch (reg) {
	case 0: asm("movq %0, %%mm0" : : "m"(*data)); break;
	case 1: asm("movq %0, %%mm1" : : "m"(*data)); break;
	case 2: asm("movq %0, %%mm2" : : "m"(*data)); break;
	case 3: asm("movq %0, %%mm3" : : "m"(*data)); break;
	case 4: asm("movq %0, %%mm4" : : "m"(*data)); break;
	case 5: asm("movq %0, %%mm5" : : "m"(*data)); break;
	case 6: asm("movq %0, %%mm6" : : "m"(*data)); break;
	case 7: asm("movq %0, %%mm7" : : "m"(*data)); break;
	default: BUG();
	}
	ctxt->ops->put_fpu(ctxt);
}

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86
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86
100.00%
1
100.00%



static int em_fninit(struct x86_emulate_ctxt *ctxt)
{
	if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
		return emulate_nm(ctxt);

	ctxt->ops->get_fpu(ctxt);
	asm volatile("fninit");
	ctxt->ops->put_fpu(ctxt);
	return X86EMUL_CONTINUE;
}

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60
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1
100.00%
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60
100.00%
1
100.00%



static int em_fnstcw(struct x86_emulate_ctxt *ctxt)
{
	u16 fcw;

	if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
		return emulate_nm(ctxt);

	ctxt->ops->get_fpu(ctxt);
	asm volatile("fnstcw %0": "+m"(fcw));
	ctxt->ops->put_fpu(ctxt);

	ctxt->dst.val = fcw;

	return X86EMUL_CONTINUE;
}

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71
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1
100.00%
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71
100.00%
1
100.00%



static int em_fnstsw(struct x86_emulate_ctxt *ctxt)
{
	u16 fsw;

	if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
		return emulate_nm(ctxt);

	ctxt->ops->get_fpu(ctxt);
	asm volatile("fnstsw %0": "+m"(fsw));
	ctxt->ops->put_fpu(ctxt);

	ctxt->dst.val = fsw;

	return X86EMUL_CONTINUE;
}

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Gleb Natapov
71
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1
100.00%
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71
100.00%
1
100.00%



static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
				    struct operand *op)
{
	unsigned reg = ctxt->modrm_reg;

	if (!(ctxt->d & ModRM))
		reg = (ctxt->b & 7) | ((ctxt->rex_prefix & 1) << 3);

	if (ctxt->d & Sse) {
		op->type = OP_XMM;
		op->bytes = 16;
		op->addr.xmm = reg;
		read_sse_reg(ctxt, &op->vec_val, reg);
		return;
	}
	if (ctxt->d & Mmx) {
		reg &= 7;
		op->type = OP_MM;
		op->bytes = 8;
		op->addr.mm = reg;
		return;
	}

	op->type = OP_REG;
	op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
	op->addr.reg = decode_register(ctxt, reg, ctxt->d & ByteOp);

	fetch_register_operand(op);
	op->orig_val = op->val;
}

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Avi Kivity
176
92.63%
10
90.91%
Gleb Natapov
14
7.37%
1
9.09%
Total
190
100.00%
11
100.00%



static void adjust_modrm_seg(struct x86_emulate_ctxt *ctxt, int base_reg)
{
	if (base_reg == VCPU_REGS_RSP || base_reg == VCPU_REGS_RBP)
		ctxt->modrm_seg = VCPU_SREG_SS;
}

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30
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1
100.00%



static int decode_modrm(struct x86_emulate_ctxt *ctxt,
			struct operand *op)
{
	u8 sib;
	int index_reg, base_reg, scale;
	int rc = X86EMUL_CONTINUE;
	ulong modrm_ea = 0;

	ctxt->modrm_reg = ((ctxt->rex_prefix << 1) & 8); /* REX.R */
	index_reg = (ctxt->rex_prefix << 2) & 8; /* REX.X */
	base_reg = (ctxt->rex_prefix << 3) & 8; /* REX.B */

	ctxt->modrm_mod = (ctxt->modrm & 0xc0) >> 6;
	ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3;
	ctxt->modrm_rm = base_reg | (ctxt->modrm & 0x07);
	ctxt->modrm_seg = VCPU_SREG_DS;

	if (ctxt->modrm_mod == 3 || (ctxt->d & NoMod)) {
		op->type = OP_REG;
		op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
		op->addr.reg = decode_register(ctxt, ctxt->modrm_rm,
				ctxt->d & ByteOp);
		if (ctxt->d & Sse) {
			op->type = OP_XMM;
			op->bytes = 16;
			op->addr.xmm = ctxt->modrm_rm;
			read_sse_reg(ctxt, &op->vec_val, ctxt->modrm_rm);
			return rc;
		}
		if (ctxt->d & Mmx) {
			op->type = OP_MM;
			op->bytes = 8;
			op->addr.mm = ctxt->modrm_rm & 7;
			return rc;
		}
		fetch_register_operand(op);
		return rc;
	}

	op->type = OP_MEM;

	if (ctxt->ad_bytes == 2) {
		unsigned bx = reg_read(ctxt, VCPU_REGS_RBX);
		unsigned bp = reg_read(ctxt, VCPU_REGS_RBP);
		unsigned si = reg_read(ctxt, VCPU_REGS_RSI);
		unsigned di = reg_read(ctxt, VCPU_REGS_RDI);

		/* 16-bit ModR/M decode. */
		switch (ctxt->modrm_mod) {
		case 0:
			if (ctxt->modrm_rm == 6)
				modrm_ea += insn_fetch(u16, ctxt);
			break;
		case 1:
			modrm_ea += insn_fetch(s8, ctxt);
			break;
		case 2:
			modrm_ea += insn_fetch(u16, ctxt);
			break;
		}
		switch (ctxt->modrm_rm) {
		case 0:
			modrm_ea += bx + si;
			break;
		case 1:
			modrm_ea += bx + di;
			break;
		case 2:
			modrm_ea += bp + si;
			break;
		case 3:
			modrm_ea += bp + di;
			break;
		case 4:
			modrm_ea += si;
			break;
		case 5:
			modrm_ea += di;
			break;
		case 6:
			if (ctxt->modrm_mod != 0)
				modrm_ea += bp;
			break;
		case 7:
			modrm_ea += bx;
			break;
		}
		if (ctxt->modrm_rm == 2 || ctxt->modrm_rm == 3 ||
		    (ctxt->modrm_rm == 6 && ctxt->modrm_mod != 0))
			ctxt->modrm_seg = VCPU_SREG_SS;
		modrm_ea = (u16)modrm_ea;
	} else {
		/* 32/64-bit ModR/M decode. */
		if ((ctxt->modrm_rm & 7) == 4) {
			sib = insn_fetch(u8, ctxt);
			index_reg |= (sib >> 3) & 7;
			base_reg |= sib & 7;
			scale = sib >> 6;

			if ((base_reg & 7) == 5 && ctxt->modrm_mod == 0)
				modrm_ea += insn_fetch(s32, ctxt);
			else {
				modrm_ea += reg_read(ctxt, base_reg);
				adjust_modrm_seg(ctxt, base_reg);
				/* Increment ESP on POP [ESP] */
				if ((ctxt->d & IncSP) &&
				    base_reg == VCPU_REGS_RSP)
					modrm_ea += ctxt->op_bytes;
			}
			if (index_reg != 4)
				modrm_ea += reg_read(ctxt, index_reg) << scale;
		} else if ((ctxt->modrm_rm & 7) == 5 && ctxt->modrm_mod == 0) {
			modrm_ea += insn_fetch(s32, ctxt);
			if (ctxt->mode == X86EMUL_MODE_PROT64)
				ctxt->rip_relative = 1;
		} else {
			base_reg = ctxt->modrm_rm;
			modrm_ea += reg_read(ctxt, base_reg);
			adjust_modrm_seg(ctxt, base_reg);
		}
		switch (ctxt->modrm_mod) {
		case 1:
			modrm_ea += insn_fetch(s8, ctxt);
			break;
		case 2:
			modrm_ea += insn_fetch(s32, ctxt);
			break;
		}
	}
	op->addr.mem.ea = modrm_ea;
	if (ctxt->ad_bytes != 8)
		ctxt->memop.addr.mem.ea = (u32)ctxt->memop.addr.mem.ea;

done:
	return rc;
}

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Avi Kivity
719
89.32%
12
66.67%
Bandan Das
47
5.84%
2
11.11%
Nadav Amit
38
4.72%
3
16.67%
Paolo Bonzini
1
0.12%
1
5.56%
Total
805
100.00%
18
100.00%



static int decode_abs(struct x86_emulate_ctxt *ctxt,
		      struct operand *op)
{
	int rc = X86EMUL_CONTINUE;

	op->type = OP_MEM;
	switch (ctxt->ad_bytes) {
	case 2:
		op->addr.mem.ea = insn_fetch(u16, ctxt);
		break;
	case 4:
		op->addr.mem.ea = insn_fetch(u32, ctxt);
		break;
	case 8:
		op->addr.mem.ea = insn_fetch(u64, ctxt);
		break;
	}
done:
	return rc;
}

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Avi Kivity
97
100.00%
5
100.00%
Total
97
100.00%
5
100.00%



static void fetch_bit_operand(struct x86_emulate_ctxt *ctxt)
{
	long sv = 0, mask;

	if (ctxt->dst.type == OP_MEM && ctxt->src.type == OP_REG) {
		mask = ~((long)ctxt->dst.bytes * 8 - 1);

		if (ctxt->src.bytes == 2)
			sv = (s16)ctxt->src.val & (s16)mask;
		else if (ctxt->src.bytes == 4)
			sv = (s32)ctxt->src.val & (s32)mask;
		else
			sv = (s64)ctxt->src.val & (s64)mask;

		ctxt->dst.addr.mem.ea = address_mask(ctxt,
					   ctxt->dst.addr.mem.ea + (sv >> 3));
	}

	/* only subword offset */
	ctxt->src.val &= (ctxt->dst.bytes << 3) - 1;
}

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Wei Yongjun
124
70.45%
3
37.50%
Nadav Amit
36
20.45%
2
25.00%
Avi Kivity
14
7.95%
2
25.00%
Sheng Yang
2
1.14%
1
12.50%
Total
176
100.00%
8
100.00%



static int read_emulated(struct x86_emulate_ctxt *ctxt,
			 unsigned long addr, void *dest, unsigned size)
{
	int rc;
	struct read_cache *mc = &ctxt->mem_read;

	if (mc->pos < mc->end)
		goto read_cached;

	WARN_ON((mc->end + size) >= sizeof(mc->data));

	rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size,
				      &ctxt->exception);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	mc->end += size;

read_cached:
	memcpy(dest, mc->data + mc->pos, size);
	mc->pos += size;
	return X86EMUL_CONTINUE;
}

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Avi Kivity
111
82.22%
4
66.67%
Xiao Guangrong
22
16.30%
1
16.67%
Takuya Yoshikawa
2
1.48%
1
16.67%
Total
135
100.00%
6
100.00%



static int segmented_read(struct x86_emulate_ctxt *ctxt,
			  struct segmented_address addr,
			  void *data,
			  unsigned size)
{
	int rc;
	ulong linear;

	rc = linearize(ctxt, addr, size, false, &linear);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	return read_emulated(ctxt, linear, data, size);
}

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Avi Kivity
65
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3
100.00%
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65
100.00%
3
100.00%



static int segmented_write(struct x86_emulate_ctxt *ctxt,
			   struct segmented_address addr,
			   const void *data,
			   unsigned size)
{
	int rc;
	ulong linear;

	rc = linearize(ctxt, addr, size, true, &linear);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	return ctxt->ops->write_emulated(ctxt, linear, data, size,
					 &ctxt->exception);
}

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75
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4
100.00%
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75
100.00%
4
100.00%



static int segmented_cmpxchg(struct x86_emulate_ctxt *ctxt,
			     struct segmented_address addr,
			     const void *orig_data, const void *data,
			     unsigned size)
{
	int rc;
	ulong linear;

	rc = linearize(ctxt, addr, size, true, &linear);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	return ctxt->ops->cmpxchg_emulated(ctxt, linear, orig_data, data,
					   size, &ctxt->exception);
}

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82
100.00%
4
100.00%



static int pio_in_emulated(struct x86_emulate_ctxt *ctxt,
			   unsigned int size, unsigned short port,
			   void *dest)
{
	struct read_cache *rc = &ctxt->io_read;

	if (rc->pos == rc->end) { /* refill pio read ahead */
		unsigned int in_page, n;
		unsigned int count = ctxt->rep_prefix ?
			address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) : 1;
		in_page = (ctxt->eflags & X86_EFLAGS_DF) ?
			offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)) :
			PAGE_SIZE - offset_in_page(reg_read(ctxt, VCPU_REGS_RDI));
		n = min3(in_page, (unsigned int)sizeof(rc->data) / size, count);
		if (n == 0)
			n = 1;
		rc->pos = rc->end = 0;
		if (!ctxt->ops->pio_in_emulated(ctxt, size, port, rc->data, n))
			return 0;
		rc->end = n * size;
	}

	if (ctxt->rep_prefix && (ctxt->d & String) &&
	    !(ctxt->eflags & X86_EFLAGS_DF)) {
		ctxt->dst.data = rc->data + rc->pos;
		ctxt->dst.type = OP_MEM_STR;
		ctxt->dst.count = (rc->end - rc->pos) / size;
		rc->pos = rc->end;
	} else {
		memcpy(dest, rc->data + rc->pos, size);
		rc->pos += size;
	}
	return 1;
}

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Avi Kivity
201
71.53%
5
50.00%
Gleb Natapov
67
23.84%
1
10.00%
Nadav Amit
10
3.56%
2
20.00%
Takuya Yoshikawa
2
0.71%
1
10.00%
Mark D Rustad
1
0.36%
1
10.00%
Total
281
100.00%
10
100.00%



static int read_interrupt_descriptor(struct x86_emulate_ctxt *ctxt,
				     u16 index, struct desc_struct *desc)
{
	struct desc_ptr dt;
	ulong addr;

	ctxt->ops->get_idt(ctxt, &dt);

	if (dt.size < index * 8 + 7)
		return emulate_gp(ctxt, index << 3 | 0x2);

	addr = dt.address + index * 8;
	return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc,
				   &ctxt->exception);
}

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Kevin Wolf
95
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1
100.00%
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95
100.00%
1
100.00%



static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt,
				     u16 selector, struct desc_ptr *dt)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	u32 base3 = 0;

	if (selector & 1 << 2) {
		struct desc_struct desc;
		u16 sel;

		memset (dt, 0, sizeof *dt);
		if (!ops->get_segment(ctxt, &sel, &desc, &base3,
				      VCPU_SREG_LDTR))
			return;

		dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */
		dt->address = get_desc_base(&desc) | ((u64)base3 << 32);
	} else
		ops->get_gdt(ctxt, dt);
}

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Avi Kivity
97
78.23%
4
50.00%
Nadav Amit
16
12.90%
1
12.50%
Takuya Yoshikawa
9
7.26%
1
12.50%
Gleb Natapov
1
0.81%
1
12.50%
Mathias Krause
1
0.81%
1
12.50%
Total
124
100.00%
8
100.00%



static int get_descriptor_ptr(struct x86_emulate_ctxt *ctxt,
			      u16 selector, ulong *desc_addr_p)
{
	struct desc_ptr dt;
	u16 index = selector >> 3;
	ulong addr;

	get_descriptor_table_ptr(ctxt, selector, &dt);

	if (dt.size < index * 8 + 7)
		return emulate_gp(ctxt, selector & 0xfffc);

	addr = dt.address + index * 8;

#ifdef CONFIG_X86_64
	if (addr >> 32 != 0) {
		u64 efer = 0;

		ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
		if (!(efer & EFER_LMA))
			addr &= (u32)-1;
	}
#endif

	*desc_addr_p = addr;
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
72
54.14%
4
80.00%
Nadav Amit
61
45.86%
1
20.00%
Total
133
100.00%
5
100.00%

/* allowed just for 8 bytes segments */


static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt,
				   u16 selector, struct desc_struct *desc,
				   ulong *desc_addr_p)
{
	int rc;

	rc = get_descriptor_ptr(ctxt, selector, desc_addr_p);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	return ctxt->ops->read_std(ctxt, *desc_addr_p, desc, sizeof(*desc),
				   &ctxt->exception);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nadav Amit
50
69.44%
1
20.00%
Avi Kivity
19
26.39%
3
60.00%
Takuya Yoshikawa
3
4.17%
1
20.00%
Total
72
100.00%
5
100.00%

/* allowed just for 8 bytes segments */


static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
				    u16 selector, struct desc_struct *desc)
{
	int rc;
	ulong addr;

	rc = get_descriptor_ptr(ctxt, selector, &addr);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	return ctxt->ops->write_std(ctxt, addr, desc, sizeof *desc,
				    &ctxt->exception);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
52
75.36%
4
57.14%
Nadav Amit
10
14.49%
1
14.29%
Guillaume Thouvenin
4
5.80%
1
14.29%
Takuya Yoshikawa
3
4.35%
1
14.29%
Total
69
100.00%
7
100.00%



static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
				     u16 selector, int seg, u8 cpl,
				     enum x86_transfer_type transfer,
				     struct desc_struct *desc)
{
	struct desc_struct seg_desc, old_desc;
	u8 dpl, rpl;
	unsigned err_vec = GP_VECTOR;
	u32 err_code = 0;
	bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */
	ulong desc_addr;
	int ret;
	u16 dummy;
	u32 base3 = 0;

	memset(&seg_desc, 0, sizeof seg_desc);

	if (ctxt->mode == X86EMUL_MODE_REAL) {
		/* set real mode segment descriptor (keep limit etc. for
                 * unreal mode) */
		ctxt->ops->get_segment(ctxt, &dummy, &seg_desc, NULL, seg);
		set_desc_base(&seg_desc, selector << 4);
		goto load;
	} else if (seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86) {
		/* VM86 needs a clean new segment descriptor */
		set_desc_base(&seg_desc, selector << 4);
		set_desc_limit(&seg_desc, 0xffff);
		seg_desc.type = 3;
		seg_desc.p = 1;
		seg_desc.s = 1;
		seg_desc.dpl = 3;
		goto load;
	}

	rpl = selector & 3;

	/* TR should be in GDT only */
	if (seg == VCPU_SREG_TR && (selector & (1 << 2)))
		goto exception;

	/* NULL selector is not valid for TR, CS and (except for long mode) SS */
	if (null_selector) {
		if (seg == VCPU_SREG_CS || seg == VCPU_SREG_TR)
			goto exception;

		if (seg == VCPU_SREG_SS) {
			if (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl)
				goto exception;

			/*
                         * ctxt->ops->set_segment expects the CPL to be in
                         * SS.DPL, so fake an expand-up 32-bit data segment.
                         */
			seg_desc.type = 3;
			seg_desc.p = 1;
			seg_desc.s = 1;
			seg_desc.dpl = cpl;
			seg_desc.d = 1;
			seg_desc.g = 1;
		}

		/* Skip all following checks */
		goto load;
	}

	ret = read_segment_descriptor(ctxt, selector, &seg_desc, &desc_addr);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	err_code = selector & 0xfffc;
	err_vec = (transfer == X86_TRANSFER_TASK_SWITCH) ? TS_VECTOR :
							   GP_VECTOR;

	/* can't load system descriptor into segment selector */
	if (seg <= VCPU_SREG_GS && !seg_desc.s) {
		if (transfer == X86_TRANSFER_CALL_JMP)
			return X86EMUL_UNHANDLEABLE;
		goto exception;
	}

	if (!seg_desc.p) {
		err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR;
		goto exception;
	}

	dpl = seg_desc.dpl;

	switch (seg) {
	case VCPU_SREG_SS:
		/*
                 * segment is not a writable data segment or segment
                 * selector's RPL != CPL or segment selector's RPL != CPL
                 */
		if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl)
			goto exception;
		break;
	case VCPU_SREG_CS:
		if (!(seg_desc.type & 8))
			goto exception;

		if (seg_desc.type & 4) {
			/* conforming */
			if (dpl > cpl)
				goto exception;
		} else {
			/* nonconforming */
			if (rpl > cpl || dpl != cpl)
				goto exception;
		}
		/* in long-mode d/b must be clear if l is set */
		if (seg_desc.d && seg_desc.l) {
			u64 efer = 0;

			ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
			if (efer & EFER_LMA)
				goto exception;
		}

		/* CS(RPL) <- CPL */
		selector = (selector & 0xfffc) | cpl;
		break;
	case VCPU_SREG_TR:
		if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9))
			goto exception;
		old_desc = seg_desc;
		seg_desc.type |= 2; /* busy */
		ret = ctxt->ops->cmpxchg_emulated(ctxt, desc_addr, &old_desc, &seg_desc,
						  sizeof(seg_desc), &ctxt->exception);
		if (ret != X86EMUL_CONTINUE)
			return ret;
		break;
	case VCPU_SREG_LDTR:
		if (seg_desc.s || seg_desc.type != 2)
			goto exception;
		break;
	default: /*  DS, ES, FS, or GS */
		/*
                 * segment is not a data or readable code segment or
                 * ((segment is a data or nonconforming code segment)
                 * and (both RPL and CPL > DPL))
                 */
		if ((seg_desc.type & 0xa) == 0x8 ||
		    (((seg_desc.type & 0xc) != 0xc) &&
		     (rpl > dpl && cpl > dpl)))
			goto exception;
		break;
	}

	if (seg_desc.s) {
		/* mark segment as accessed */
		if (!(seg_desc.type & 1)) {
			seg_desc.type |= 1;
			ret = write_segment_descriptor(ctxt, selector,
						       &seg_desc);
			if (ret != X86EMUL_CONTINUE)
				return ret;
		}
	} else if (ctxt->mode == X86EMUL_MODE_PROT64) {
		ret = ctxt->ops->read_std(ctxt, desc_addr+8, &base3,
				sizeof(base3), &ctxt->exception);
		if (ret != X86EMUL_CONTINUE)
			return ret;
		if (emul_is_noncanonical_address(get_desc_base(&seg_desc) |
				((u64)base3 << 32), ctxt))
			return emulate_gp(ctxt, 0);
	}
load:
	ctxt->ops->set_segment(ctxt, selector, &seg_desc, base3, seg);
	if (desc)
		*desc = seg_desc;
	return X86EMUL_CONTINUE;
exception:
	return emulate_exception(ctxt, err_vec, err_code, true);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
528
62.04%
8
33.33%
Nadav Amit
168
19.74%
6
25.00%
Paolo Bonzini
86
10.11%
5
20.83%
Kevin Wolf
62
7.29%
1
4.17%
Yu Zhang
3
0.35%
1
4.17%
Takuya Yoshikawa
2
0.24%
1
4.17%
Guo Chao
1
0.12%
1
4.17%
Gleb Natapov
1
0.12%
1
4.17%
Total
851
100.00%
24
100.00%



static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
				   u16 selector, int seg)
{
	u8 cpl = ctxt->ops->cpl(ctxt);

	/*
         * None of MOV, POP and LSS can load a NULL selector in CPL=3, but
         * they can load it at CPL<3 (Intel's manual says only LSS can,
         * but it's wrong).
         *
         * However, the Intel manual says that putting IST=1/DPL=3 in
         * an interrupt gate will result in SS=3 (the AMD manual instead
         * says it doesn't), so allow SS=3 in __load_segment_descriptor
         * and only forbid it here.
         */
	if (seg == VCPU_SREG_SS && selector == 3 &&
	    ctxt->mode == X86EMUL_MODE_PROT64)
		return emulate_exception(ctxt, GP_VECTOR, 0, true);

	return __load_segment_descriptor(ctxt, selector, seg, cpl,
					 X86_TRANSFER_NONE, NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
71
95.95%
3
60.00%
Nadav Amit
3
4.05%
2
40.00%
Total
74
100.00%
5
100.00%



static void write_register_operand(struct operand *op)
{
	return assign_register(op->addr.reg, op->val, op->bytes);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
13
44.83%
3
60.00%
Wei Yongjun
8
27.59%
1
20.00%
Nadav Amit
8
27.59%
1
20.00%
Total
29
100.00%
5
100.00%



static int writeback(struct x86_emulate_ctxt *ctxt, struct operand *op)
{
	switch (op->type) {
	case OP_REG:
		write_register_operand(op);
		break;
	case OP_MEM:
		if (ctxt->lock_prefix)
			return segmented_cmpxchg(ctxt,
						 op->addr.mem,
						 &op->orig_val,
						 &op->val,
						 op->bytes);
		else
			return segmented_write(ctxt,
					       op->addr.mem,
					       &op->val,
					       op->bytes);
		break;
	case OP_MEM_STR:
		return segmented_write(ctxt,
				       op->addr.mem,
				       op->data,
				       op->bytes * op->count);
		break;
	case OP_XMM:
		write_sse_reg(ctxt, &op->vec_val, op->addr.xmm);
		break;
	case OP_MM:
		write_mmx_reg(ctxt, &op->mm_val, op->addr.mm);
		break;
	case OP_NONE:
		/* no writeback */
		break;
	default:
		break;
	}
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
119
70.41%
8
72.73%
Wei Yongjun
23
13.61%
1
9.09%
Gleb Natapov
23
13.61%
1
9.09%
Paolo Bonzini
4
2.37%
1
9.09%
Total
169
100.00%
11
100.00%



static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes)
{
	struct segmented_address addr;

	rsp_increment(ctxt, -bytes);
	addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt);
	addr.seg = VCPU_SREG_SS;

	return segmented_write(ctxt, addr, data, bytes);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
60
93.75%
8
88.89%
Takuya Yoshikawa
4
6.25%
1
11.11%
Total
64
100.00%
9
100.00%



static int em_push(struct x86_emulate_ctxt *ctxt)
{
	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return push(ctxt, &ctxt->src.val, ctxt->op_bytes);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takuya Yoshikawa
22
59.46%
1
25.00%
Avi Kivity
15
40.54%
3
75.00%
Total
37
100.00%
4
100.00%



static int emulate_pop(struct x86_emulate_ctxt *ctxt,
		       void *dest, int len)
{
	int rc;
	struct segmented_address addr;

	addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt);
	addr.seg = VCPU_SREG_SS;
	rc = segmented_read(ctxt, addr, dest, len);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	rsp_increment(ctxt, len);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
73
92.41%
6
75.00%
Harvey Harrison
3
3.80%
1
12.50%
Gleb Natapov
3
3.80%
1
12.50%
Total
79
100.00%
8
100.00%



static int em_pop(struct x86_emulate_ctxt *ctxt)
{
	return emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takuya Yoshikawa
26
92.86%
1
50.00%
Avi Kivity
2
7.14%
1
50.00%
Total
28
100.00%
2
100.00%



static int emulate_popf(struct x86_emulate_ctxt *ctxt,
			void *dest, int len)
{
	int rc;
	unsigned long val, change_mask;
	int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> X86_EFLAGS_IOPL_BIT;
	int cpl = ctxt->ops->cpl(ctxt);

	rc = emulate_pop(ctxt, &val, len);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	change_mask = X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
		      X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF |
		      X86_EFLAGS_TF | X86_EFLAGS_DF | X86_EFLAGS_NT |
		      X86_EFLAGS_AC | X86_EFLAGS_ID;

	switch(ctxt->mode) {
	case X86EMUL_MODE_PROT64:
	case X86EMUL_MODE_PROT32:
	case X86EMUL_MODE_PROT16:
		if (cpl == 0)
			change_mask |= X86_EFLAGS_IOPL;
		if (cpl <= iopl)
			change_mask |= X86_EFLAGS_IF;
		break;
	case X86EMUL_MODE_VM86:
		if (iopl < 3)
			return emulate_gp(ctxt, 0);
		change_mask |= X86_EFLAGS_IF;
		break;
	default: /* real mode */
		change_mask |= (X86_EFLAGS_IOPL | X86_EFLAGS_IF);
		break;
	}

	*(unsigned long *)dest =
		(ctxt->eflags & ~change_mask) | (val & change_mask);

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
158
81.44%
2
33.33%
Nadav Amit
17
8.76%
1
16.67%
Harvey Harrison
15
7.73%
1
16.67%
Takuya Yoshikawa
2
1.03%
1
16.67%
Laurent Vivier
2
1.03%
1
16.67%
Total
194
100.00%
6
100.00%



static int em_popf(struct x86_emulate_ctxt *ctxt)
{
	ctxt->dst.type = OP_REG;
	ctxt->dst.addr.reg = &ctxt->eflags;
	ctxt->dst.bytes = ctxt->op_bytes;
	return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takuya Yoshikawa
54
91.53%
1
50.00%
Avi Kivity
5
8.47%
1
50.00%
Total
59
100.00%
2
100.00%



static int em_enter(struct x86_emulate_ctxt *ctxt)
{
	int rc;
	unsigned frame_size = ctxt->src.val;
	unsigned nesting_level = ctxt->src2.val & 31;
	ulong rbp;

	if (nesting_level)
		return X86EMUL_UNHANDLEABLE;

	rbp = reg_read(ctxt, VCPU_REGS_RBP);
	rc = push(ctxt, &rbp, stack_size(ctxt));
	if (rc != X86EMUL_CONTINUE)
		return rc;
	assign_masked(reg_rmw(ctxt, VCPU_REGS_RBP), reg_read(ctxt, VCPU_REGS_RSP),
		      stack_mask(ctxt));
	assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP),
		      reg_read(ctxt, VCPU_REGS_RSP) - frame_size,
		      stack_mask(ctxt));
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
126
100.00%
2
100.00%
Total
126
100.00%
2
100.00%



static int em_leave(struct x86_emulate_ctxt *ctxt)
{
	assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), reg_read(ctxt, VCPU_REGS_RBP),
		      stack_mask(ctxt));
	return emulate_pop(ctxt, reg_rmw(ctxt, VCPU_REGS_RBP), ctxt->op_bytes);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
50
100.00%
2
100.00%
Total
50
100.00%
2
100.00%



static int em_push_sreg(struct x86_emulate_ctxt *ctxt)
{
	int seg = ctxt->src2.val;

	ctxt->src.val = get_segment_selector(ctxt, seg);
	if (ctxt->op_bytes == 4) {
		rsp_increment(ctxt, -2);
		ctxt->op_bytes = 2;
	}

	return em_push(ctxt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
28
44.44%
4
50.00%
Nadav Amit
24
38.10%
1
12.50%
Harvey Harrison
7
11.11%
1
12.50%
Takuya Yoshikawa
4
6.35%
2
25.00%
Total
63
100.00%
8
100.00%



static int em_pop_sreg(struct x86_emulate_ctxt *ctxt)
{
	int seg = ctxt->src2.val;
	unsigned long selector;
	int rc;

	rc = emulate_pop(ctxt, &selector, 2);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	if (ctxt->modrm_reg == VCPU_SREG_SS)
		ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
	if (ctxt->op_bytes > 2)
		rsp_increment(ctxt, ctxt->op_bytes - 2);

	rc = load_segment_descriptor(ctxt, (u16)selector, seg);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
50
51.02%
3
50.00%
Nadav Amit
19
19.39%
1
16.67%
Paolo Bonzini
15
15.31%
1
16.67%
Harvey Harrison
14
14.29%
1
16.67%
Total
98
100.00%
6
100.00%



static int em_pusha(struct x86_emulate_ctxt *ctxt)
{
	unsigned long old_esp = reg_read(ctxt, VCPU_REGS_RSP);
	int rc = X86EMUL_CONTINUE;
	int reg = VCPU_REGS_RAX;

	while (reg <= VCPU_REGS_RDI) {
		(reg == VCPU_REGS_RSP) ?
		(ctxt->src.val = old_esp) : (ctxt->src.val = reg_read(ctxt, reg));

		rc = em_push(ctxt);
		if (rc != X86EMUL_CONTINUE)
			return rc;

		++reg;
	}

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
85
91.40%
4
50.00%
Harvey Harrison
4
4.30%
1
12.50%
Takuya Yoshikawa
2
2.15%
2
25.00%
Nitin A. Kamble
2
2.15%
1
12.50%
Total
93
100.00%
8
100.00%



static int em_pushf(struct x86_emulate_ctxt *ctxt)
{
	ctxt->src.val = (unsigned long)ctxt->eflags & ~X86_EFLAGS_VM;
	return em_push(ctxt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takuya Yoshikawa
31
91.18%
1
33.33%
Nadav Amit
3
8.82%
2
66.67%
Total
34
100.00%
3
100.00%



static int em_popa(struct x86_emulate_ctxt *ctxt)
{
	int rc = X86EMUL_CONTINUE;
	int reg = VCPU_REGS_RDI;
	u32 val;

	while (reg >= VCPU_REGS_RAX) {
		if (reg == VCPU_REGS_RSP) {
			rsp_increment(ctxt, ctxt->op_bytes);
			--reg;
		}

		rc = emulate_pop(ctxt, &val, ctxt->op_bytes);
		if (rc != X86EMUL_CONTINUE)
			break;
		assign_register(reg_rmw(ctxt, reg), val, ctxt->op_bytes);
		--reg;
	}
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
73
76.84%
4
66.67%
Nadav Amit
21
22.11%
1
16.67%
Takuya Yoshikawa
1
1.05%
1
16.67%
Total
95
100.00%
6
100.00%



static int __emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	int rc;
	struct desc_ptr dt;
	gva_t cs_addr;
	gva_t eip_addr;
	u16 cs, eip;

	/* TODO: Add limit checks */
	ctxt->src.val = ctxt->eflags;
	rc = em_push(ctxt);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	ctxt->eflags &= ~(X86_EFLAGS_IF | X86_EFLAGS_TF | X86_EFLAGS_AC);

	ctxt->src.val = get_segment_selector(ctxt, VCPU_SREG_CS);
	rc = em_push(ctxt);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	ctxt->src.val = ctxt->_eip;
	rc = em_push(ctxt);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	ops->get_idt(ctxt, &dt);

	eip_addr = dt.address + (irq << 2);
	cs_addr = dt.address + (irq << 2) + 2;

	rc = ops->read_std(ctxt, cs_addr, &cs, 2, &ctxt->exception);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	rc = ops->read_std(ctxt, eip_addr, &eip, 2, &ctxt->exception);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	rc = load_segment_descriptor(ctxt, cs, VCPU_SREG_CS);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	ctxt->_eip = eip;

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mohammed Gamal
179
68.32%
1
8.33%
Avi Kivity
68
25.95%
7
58.33%
Takuya Yoshikawa
11
4.20%
2
16.67%
Nadav Amit
3
1.15%
1
8.33%
Mathias Krause
1
0.38%
1
8.33%
Total
262
100.00%
12
100.00%



int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq)
{
	int rc;

	invalidate_registers(ctxt);
	rc = __emulate_int_real(ctxt, irq);
	if (rc == X86EMUL_CONTINUE)
		writeback_registers(ctxt);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
44
100.00%
1
100.00%
Total
44
100.00%
1
100.00%



static int emulate_int(struct x86_emulate_ctxt *ctxt, int irq)
{
	switch(ctxt->mode) {
	case X86EMUL_MODE_REAL:
		return __emulate_int_real(ctxt, irq);
	case X86EMUL_MODE_VM86:
	case X86EMUL_MODE_PROT16:
	case X86EMUL_MODE_PROT32:
	case X86EMUL_MODE_PROT64:
	default:
		/* Protected mode interrupts unimplemented yet */
		return X86EMUL_UNHANDLEABLE;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mohammed Gamal
49
98.00%
1
50.00%
Avi Kivity
1
2.00%
1
50.00%
Total
50
100.00%
2
100.00%



static int emulate_iret_real(struct x86_emulate_ctxt *ctxt)
{
	int rc = X86EMUL_CONTINUE;
	unsigned long temp_eip = 0;
	unsigned long temp_eflags = 0;
	unsigned long cs = 0;
	unsigned long mask = X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
			     X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_TF |
			     X86_EFLAGS_IF | X86_EFLAGS_DF | X86_EFLAGS_OF |
			     X86_EFLAGS_IOPL | X86_EFLAGS_NT | X86_EFLAGS_RF |
			     X86_EFLAGS_AC | X86_EFLAGS_ID |
			     X86_EFLAGS_FIXED;
	unsigned long vm86_mask = X86_EFLAGS_VM | X86_EFLAGS_VIF |
				  X86_EFLAGS_VIP;

	/* TODO: Add stack limit check */

	rc = emulate_pop(ctxt, &temp_eip, ctxt->op_bytes);

	if (rc != X86EMUL_CONTINUE)
		return rc;

	if (temp_eip & ~0xffff)
		return emulate_gp(ctxt, 0);

	rc = emulate_pop(ctxt, &cs, ctxt->op_bytes);

	if (rc != X86EMUL_CONTINUE)
		return rc;

	rc = emulate_pop(ctxt, &temp_eflags, ctxt->op_bytes);

	if (rc != X86EMUL_CONTINUE)
		return rc;

	rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS);

	if (rc != X86EMUL_CONTINUE)
		return rc;

	ctxt->_eip = temp_eip;

	if (ctxt->op_bytes == 4)
		ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask));
	else if (ctxt->op_bytes == 2) {
		ctxt->eflags &= ~0xffff;
		ctxt->eflags |= temp_eflags;
	}

	ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */
	ctxt->eflags |= X86_EFLAGS_FIXED;
	ctxt->ops->set_nmi_mask(ctxt, false);

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
225
82.72%
6
60.00%
Nadav Amit
28
10.29%
2
20.00%
Gleb Natapov
17
6.25%
1
10.00%
Wanpeng Li
2
0.74%
1
10.00%
Total
272
100.00%
10
100.00%



static int em_iret(struct x86_emulate_ctxt *ctxt)
{
	switch(ctxt->mode) {
	case X86EMUL_MODE_REAL:
		return emulate_iret_real(ctxt);
	case X86EMUL_MODE_VM86:
	case X86EMUL_MODE_PROT16:
	case X86EMUL_MODE_PROT32:
	case X86EMUL_MODE_PROT64:
	default:
		/* iret from protected mode unimplemented yet */
		return X86EMUL_UNHANDLEABLE;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
45
100.00%
2
100.00%
Total
45
100.00%
2
100.00%



static int em_jmp_far(struct x86_emulate_ctxt *ctxt)
{
	int rc;
	unsigned short sel;
	struct desc_struct new_desc;
	u8 cpl = ctxt->ops->cpl(ctxt);

	memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);

	rc = __load_segment_descriptor(ctxt, sel, VCPU_SREG_CS, cpl,
				       X86_TRANSFER_CALL_JMP,
				       &new_desc);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc);
	/* Error handling is not implemented. */
	if (rc != X86EMUL_CONTINUE)
		return X86EMUL_UNHANDLEABLE;

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
66
61.11%
4
50.00%
Nadav Amit
40
37.04%
3
37.50%
Radim Krčmář
2
1.85%
1
12.50%
Total
108
100.00%
8
100.00%



static int em_jmp_abs(struct x86_emulate_ctxt *ctxt)
{
	return assign_eip_near(ctxt, ctxt->src.val);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nadav Amit
10
43.48%
1
20.00%
Avi Kivity
8
34.78%
3
60.00%
Nitin A. Kamble
5
21.74%
1
20.00%
Total
23
100.00%
5
100.00%



static int em_call_near_abs(struct x86_emulate_ctxt *ctxt)
{
	int rc;
	long int old_eip;

	old_eip = ctxt->_eip;
	rc = assign_eip_near(ctxt, ctxt->src.val);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	ctxt->src.val = old_eip;
	rc = em_push(ctxt);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
27
42.19%
3
33.33%
Nadav Amit
17
26.56%
2
22.22%
Nitin A. Kamble
11
17.19%
1
11.11%
Takuya Yoshikawa
9
14.06%
3
33.33%
Total
64
100.00%
9
100.00%



static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt)
{
	u64 old = ctxt->dst.orig_val64;

	if (ctxt->dst.bytes == 16)
		return X86EMUL_UNHANDLEABLE;

	if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) ||
	    ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) {
		*reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0);
		*reg_write(ctxt, VCPU_REGS_RDX) = (u32) (old >> 32);
		ctxt->eflags &= ~X86_EFLAGS_ZF;
	} else {
		ctxt->dst.val64 = ((u64)reg_read(ctxt, VCPU_REGS_RCX) << 32) |
			(u32) reg_read(ctxt, VCPU_REGS_RBX);

		ctxt->eflags |= X86_EFLAGS_ZF;
	}
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
146
90.12%
6
66.67%
Nadav Amit
15
9.26%
2
22.22%
Takuya Yoshikawa
1
0.62%
1
11.11%
Total
162
100.00%
9
100.00%



static int em_ret(struct x86_emulate_ctxt *ctxt)
{
	int rc;
	unsigned long eip;

	rc = emulate_pop(ctxt, &eip, ctxt->op_bytes);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	return assign_eip_near(ctxt, eip);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nadav Amit
26
53.06%
1
33.33%
Takuya Yoshikawa
21
42.86%
1
33.33%
Avi Kivity
2
4.08%
1
33.33%
Total
49
100.00%
3
100.00%



static int em_ret_far(struct x86_emulate_ctxt *ctxt)
{
	int rc;
	unsigned long eip, cs;
	int cpl = ctxt->ops->cpl(ctxt);
	struct desc_struct new_desc;

	rc = emulate_pop(ctxt, &eip, ctxt->op_bytes);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	rc = emulate_pop(ctxt, &cs, ctxt->op_bytes);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	/* Outer-privilege level return is not implemented */
	if (ctxt->mode >= X86EMUL_MODE_PROT16 && (cs & 3) > cpl)
		return X86EMUL_UNHANDLEABLE;
	rc = __load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS, cpl,
				       X86_TRANSFER_RET,
				       &new_desc);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	rc = assign_eip_far(ctxt, eip, &new_desc);
	/* Error handling is not implemented. */
	if (rc != X86EMUL_CONTINUE)
		return X86EMUL_UNHANDLEABLE;

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nadav Amit
76
48.41%
5
41.67%
Avi Kivity
76
48.41%
5
41.67%
Radim Krčmář
4
2.55%
1
8.33%
Takuya Yoshikawa
1
0.64%
1
8.33%
Total
157
100.00%
12
100.00%



static int em_ret_far_imm(struct x86_emulate_ctxt *ctxt)
{
        int rc;

        rc = em_ret_far(ctxt);
        if (rc != X86EMUL_CONTINUE)
                return rc;
        rsp_increment(ctxt, ctxt->src.val);
        return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Bruce Rogers
44
100.00%
1
100.00%
Total
44
100.00%
1
100.00%



static int em_cmpxchg(struct x86_emulate_ctxt *ctxt)
{
	/* Save real source value, then compare EAX against destination. */
	ctxt->dst.orig_val = ctxt->dst.val;
	ctxt->dst.val = reg_read(ctxt, VCPU_REGS_RAX);
	ctxt->src.orig_val = ctxt->src.val;
	ctxt->src.val = ctxt->dst.orig_val;
	fastop(ctxt, em_cmp);

	if (ctxt->eflags & X86_EFLAGS_ZF) {
		/* Success: write back to memory; no update of EAX */
		ctxt->src.type = OP_NONE;
		ctxt->dst.val = ctxt->src.orig_val;
	} else {
		/* Failure: write the value we saw to EAX. */
		ctxt->src.type = OP_REG;
		ctxt->src.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
		ctxt->src.val = ctxt->dst.orig_val;
		/* Create write-cycle to dest by writing the same value */
		ctxt->dst.val = ctxt->dst.orig_val;
	}
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takuya Yoshikawa
80
51.95%
1
16.67%
Nadav Amit
64
41.56%
3
50.00%
Avi Kivity
10
6.49%
2
33.33%
Total
154
100.00%
6
100.00%



static int em_lseg(struct x86_emulate_ctxt *ctxt)
{
	int seg = ctxt->src2.val;
	unsigned short sel;
	int rc;

	memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);

	rc = load_segment_descriptor(ctxt, sel, seg);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	ctxt->dst.val = ctxt->src.val;
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wei Yongjun
66
82.50%
1
33.33%
Avi Kivity
14
17.50%
2
66.67%
Total
80
100.00%
3
100.00%



static int emulator_has_longmode(struct x86_emulate_ctxt *ctxt)
{
	u32 eax, ebx, ecx, edx;

	eax = 0x80000001;
	ecx = 0;
	ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx, false);
	return edx & bit(X86_FEATURE_LM);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
57
96.61%
1
50.00%
Yu Zhang
2
3.39%
1
50.00%
Total
59
100.00%
2
100.00%


#define GET_SMSTATE(type, smbase, offset)				  \
	({                                                                \
         type __val;                                                      \
         int r = ctxt->ops->read_phys(ctxt, smbase + offset, &__val,      \
                                      sizeof(__val));                     \
         if (r != X86EMUL_CONTINUE)                                       \
                 return X86EMUL_UNHANDLEABLE;                             \
         __val;                                                           \
        })



static void rsm_set_desc_flags(struct desc_struct *desc, u32 flags)
{
	desc->g    = (flags >> 23) & 1;
	desc->d    = (flags >> 22) & 1;
	desc->l    = (flags >> 21) & 1;
	desc->avl  = (flags >> 20) & 1;
	desc->p    = (flags >> 15) & 1;
	desc->dpl  = (flags >> 13) & 3;
	desc->s    = (flags >> 12) & 1;
	desc->type = (flags >>  8) & 15;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
110
100.00%
1
100.00%
Total
110
100.00%
1
100.00%



static int rsm_load_seg_32(struct x86_emulate_ctxt *ctxt, u64 smbase, int n)
{
	struct desc_struct desc;
	int offset;
	u16 selector;

	selector = GET_SMSTATE(u32, smbase, 0x7fa8 + n * 4);

	if (n < 3)
		offset = 0x7f84 + n * 12;
	else
		offset = 0x7f2c + (n - 3) * 12;

	set_desc_base(&desc,      GET_SMSTATE(u32, smbase, offset + 8));
	set_desc_limit(&desc,     GET_SMSTATE(u32, smbase, offset + 4));
	rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smbase, offset));
	ctxt->ops->set_segment(ctxt, selector, &desc, 0, n);
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
139
100.00%
1
100.00%
Total
139
100.00%
1
100.00%



static int rsm_load_seg_64(struct x86_emulate_ctxt *ctxt, u64 smbase, int n)
{
	struct desc_struct desc;
	int offset;
	u16 selector;
	u32 base3;

	offset = 0x7e00 + n * 16;

	selector =                GET_SMSTATE(u16, smbase, offset);
	rsm_set_desc_flags(&desc, GET_SMSTATE(u16, smbase, offset + 2) << 8);
	set_desc_limit(&desc,     GET_SMSTATE(u32, smbase, offset + 4));
	set_desc_base(&desc,      GET_SMSTATE(u32, smbase, offset + 8));
	base3 =                   GET_SMSTATE(u32, smbase, offset + 12);

	ctxt->ops->set_segment(ctxt, selector, &desc, base3, n);
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
136
100.00%
1
100.00%
Total
136
100.00%
1
100.00%



static int rsm_enter_protected_mode(struct x86_emulate_ctxt *ctxt,
				     u64 cr0, u64 cr4)
{
	int bad;

	/*
         * First enable PAE, long mode needs it before CR0.PG = 1 is set.
         * Then enable protected mode.  However, PCID cannot be enabled
         * if EFER.LMA=0, so set it separately.
         */
	bad = ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE);
	if (bad)
		return X86EMUL_UNHANDLEABLE;

	bad = ctxt->ops->set_cr(ctxt, 0, cr0);
	if (bad)
		return X86EMUL_UNHANDLEABLE;

	if (cr4 & X86_CR4_PCIDE) {
		bad = ctxt->ops->set_cr(ctxt, 4, cr4);
		if (bad)
			return X86EMUL_UNHANDLEABLE;
	}

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
101
100.00%
1
100.00%
Total
101
100.00%
1
100.00%



static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt, u64 smbase)
{
	struct desc_struct desc;
	struct desc_ptr dt;
	u16 selector;
	u32 val, cr0, cr4;
	int i;

	cr0 =                      GET_SMSTATE(u32, smbase, 0x7ffc);
	ctxt->ops->set_cr(ctxt, 3, GET_SMSTATE(u32, smbase, 0x7ff8));
	ctxt->eflags =             GET_SMSTATE(u32, smbase, 0x7ff4) | X86_EFLAGS_FIXED;
	ctxt->_eip =               GET_SMSTATE(u32, smbase, 0x7ff0);

	for (i = 0; i < 8; i++)
		*reg_write(ctxt, i) = GET_SMSTATE(u32, smbase, 0x7fd0 + i * 4);

	val = GET_SMSTATE(u32, smbase, 0x7fcc);
	ctxt->ops->set_dr(ctxt, 6, (val & DR6_VOLATILE) | DR6_FIXED_1);
	val = GET_SMSTATE(u32, smbase, 0x7fc8);
	ctxt->ops->set_dr(ctxt, 7, (val & DR7_VOLATILE) | DR7_FIXED_1);

	selector =                 GET_SMSTATE(u32, smbase, 0x7fc4);
	set_desc_base(&desc,       GET_SMSTATE(u32, smbase, 0x7f64));
	set_desc_limit(&desc,      GET_SMSTATE(u32, smbase, 0x7f60));
	rsm_set_desc_flags(&desc,  GET_SMSTATE(u32, smbase, 0x7f5c));
	ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_TR);

	selector =                 GET_SMSTATE(u32, smbase, 0x7fc0);
	set_desc_base(&desc,       GET_SMSTATE(u32, smbase, 0x7f80));
	set_desc_limit(&desc,      GET_SMSTATE(u32, smbase, 0x7f7c));
	rsm_set_desc_flags(&desc,  GET_SMSTATE(u32, smbase, 0x7f78));
	ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_LDTR);

	dt.address =               GET_SMSTATE(u32, smbase, 0x7f74);
	dt.size =                  GET_SMSTATE(u32, smbase, 0x7f70);
	ctxt->ops->set_gdt(ctxt, &dt);

	dt.address =               GET_SMSTATE(u32, smbase, 0x7f58);
	dt.size =                  GET_SMSTATE(u32, smbase, 0x7f54);
	ctxt->ops->set_idt(ctxt, &dt);

	for (i = 0; i < 6; i++) {
		int r = rsm_load_seg_32(ctxt, smbase, i);
		if (r != X86EMUL_CONTINUE)
			return r;
	}

	cr4 = GET_SMSTATE(u32, smbase, 0x7f14);

	ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smbase, 0x7ef8));

	return rsm_enter_protected_mode(ctxt, cr0, cr4);
}

Contributors
Person
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Paolo Bonzini
487
100.00%
1
100.00%
Total
487
100.00%
1
100.00%



static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt, u64 smbase)
{
	struct desc_struct desc;
	struct desc_ptr dt;
	u64 val, cr0, cr4;
	u32 base3;
	u16 selector;
	int i, r;

	for (i = 0; i < 16; i++)
		*reg_write(ctxt, i) = GET_SMSTATE(u64, smbase, 0x7ff8 - i * 8);

	ctxt->_eip   = GET_SMSTATE(u64, smbase, 0x7f78);
	ctxt->eflags = GET_SMSTATE(u32, smbase, 0x7f70) | X86_EFLAGS_FIXED;

	val = GET_SMSTATE(u32, smbase, 0x7f68);
	ctxt->ops->set_dr(ctxt, 6, (val & DR6_VOLATILE) | DR6_FIXED_1);
	val = GET_SMSTATE(u32, smbase, 0x7f60);
	ctxt->ops->set_dr(ctxt, 7, (val & DR7_VOLATILE) | DR7_FIXED_1);

	cr0 =                       GET_SMSTATE(u64, smbase, 0x7f58);
	ctxt->ops->set_cr(ctxt, 3,  GET_SMSTATE(u64, smbase, 0x7f50));
	cr4 =                       GET_SMSTATE(u64, smbase, 0x7f48);
	ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smbase, 0x7f00));
	val =                       GET_SMSTATE(u64, smbase, 0x7ed0);
	ctxt->ops->set_msr(ctxt, MSR_EFER, val & ~EFER_LMA);

	selector =                  GET_SMSTATE(u32, smbase, 0x7e90);
	rsm_set_desc_flags(&desc,   GET_SMSTATE(u32, smbase, 0x7e92) << 8);
	set_desc_limit(&desc,       GET_SMSTATE(u32, smbase, 0x7e94));
	set_desc_base(&desc,        GET_SMSTATE(u32, smbase, 0x7e98));
	base3 =                     GET_SMSTATE(u32, smbase, 0x7e9c);
	ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_TR);

	dt.size =                   GET_SMSTATE(u32, smbase, 0x7e84);
	dt.address =                GET_SMSTATE(u64, smbase, 0x7e88);
	ctxt->ops->set_idt(ctxt, &dt);

	selector =                  GET_SMSTATE(u32, smbase, 0x7e70);
	rsm_set_desc_flags(&desc,   GET_SMSTATE(u32, smbase, 0x7e72) << 8);
	set_desc_limit(&desc,       GET_SMSTATE(u32, smbase, 0x7e74));
	set_desc_base(&desc,        GET_SMSTATE(u32, smbase, 0x7e78));
	base3 =                     GET_SMSTATE(u32, smbase, 0x7e7c);
	ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_LDTR);

	dt.size =                   GET_SMSTATE(u32, smbase, 0x7e64);
	dt.address =                GET_SMSTATE(u64, smbase, 0x7e68);
	ctxt->ops->set_gdt(ctxt, &dt);

	r = rsm_enter_protected_mode(ctxt, cr0, cr4);
	if (r != X86EMUL_CONTINUE)
		return r;

	for (i = 0; i < 6; i++) {
		r = rsm_load_seg_64(ctxt, smbase, i);
		if (r != X86EMUL_CONTINUE)
			return r;
	}

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
557
100.00%
2
100.00%
Total
557
100.00%
2
100.00%



static int em_rsm(struct x86_emulate_ctxt *ctxt)
{
	unsigned long cr0, cr4, efer;
	u64 smbase;
	int ret;

	if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_MASK) == 0)
		return emulate_ud(ctxt);

	/*
         * Get back to real mode, to prepare a safe state in which to load
         * CR0/CR3/CR4/EFER.  It's all a bit more complicated if the vCPU
         * supports long mode.
         */
	cr4 = ctxt->ops->get_cr(ctxt, 4);
	if (emulator_has_longmode(ctxt)) {
		struct desc_struct cs_desc;

		/* Zero CR4.PCIDE before CR0.PG.  */
		if (cr4 & X86_CR4_PCIDE) {
			ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE);
			cr4 &= ~X86_CR4_PCIDE;
		}

		/* A 32-bit code segment is required to clear EFER.LMA.  */
		memset(&cs_desc, 0, sizeof(cs_desc));
		cs_desc.type = 0xb;
		cs_desc.s = cs_desc.g = cs_desc.p = 1;
		ctxt->ops->set_segment(ctxt, 0, &cs_desc, 0, VCPU_SREG_CS);
	}

	/* For the 64-bit case, this will clear EFER.LMA.  */
	cr0 = ctxt->ops->get_cr(ctxt, 0);
	if (cr0 & X86_CR0_PE)
		ctxt->ops->set_cr(ctxt, 0, cr0 & ~(X86_CR0_PG | X86_CR0_PE));

	/* Now clear CR4.PAE (which must be done before clearing EFER.LME).  */
	if (cr4 & X86_CR4_PAE)
		ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PAE);

	/* And finally go back to 32-bit mode.  */
	efer = 0;
	ctxt->ops->set_msr(ctxt, MSR_EFER, efer);

	smbase = ctxt->ops->get_smbase(ctxt);
	if (emulator_has_longmode(ctxt))
		ret = rsm_load_state_64(ctxt, smbase + 0x8000);
	else
		ret = rsm_load_state_32(ctxt, smbase + 0x8000);

	if (ret != X86EMUL_CONTINUE) {
		/* FIXME: should triple fault */
		return X86EMUL_UNHANDLEABLE;
	}

	if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_INSIDE_NMI_MASK) == 0)
		ctxt->ops->set_nmi_mask(ctxt, false);

	ctxt->ops->set_hflags(ctxt, ctxt->ops->get_hflags(ctxt) &
		~(X86EMUL_SMM_INSIDE_NMI_MASK | X86EMUL_SMM_MASK));
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
317
91.35%
3
75.00%
Ladi Prosek
30
8.65%
1
25.00%
Total
347
100.00%
4
100.00%


static void

setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
			struct desc_struct *cs, struct desc_struct *ss)
{
	cs->l = 0;		/* will be adjusted later */
	set_desc_base(cs, 0);	/* flat segment */
	cs->g = 1;		/* 4kb granularity */
	set_desc_limit(cs, 0xfffff);	/* 4GB limit */
	cs->type = 0x0b;	/* Read, Execute, Accessed */
	cs->s = 1;
	cs->dpl = 0;		/* will be adjusted later */
	cs->p = 1;
	cs->d = 1;
	cs->avl = 0;

	set_desc_base(ss, 0);	/* flat segment */
	set_desc_limit(ss, 0xfffff);	/* 4GB limit */
	ss->g = 1;		/* 4kb granularity */
	ss->s = 1;
	ss->type = 0x03;	/* Read/Write, Accessed */
	ss->d = 1;		/* 32bit stack segment */
	ss->dpl = 0;
	ss->p = 1;
	ss->l = 0;
	ss->avl = 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
132
84.62%
4
57.14%
Gleb Natapov
18
11.54%
1
14.29%
Laurent Vivier
6
3.85%
2
28.57%
Total
156
100.00%
7
100.00%



static bool vendor_intel(struct x86_emulate_ctxt *ctxt)
{
	u32 eax, ebx, ecx, edx;

	eax = ecx = 0;
	ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx, false);
	return ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx
		&& ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx
		&& edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
60
96.77%
2
66.67%
Yu Zhang
2
3.23%
1
33.33%
Total
62
100.00%
3
100.00%



static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	u32 eax, ebx, ecx, edx;

	/*
         * syscall should always be enabled in longmode - so only become
         * vendor specific (cpuid) if other modes are active...
         */
	if (ctxt->mode == X86EMUL_MODE_PROT64)
		return true;

	eax = 0x00000000;
	ecx = 0x00000000;
	ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx, false);
	/*
         * Intel ("GenuineIntel")
         * remark: Intel CPUs only support "syscall" in 64bit
         * longmode. Also an 64bit guest with a
         * 32bit compat-app running will #UD !! While this
         * behaviour can be fixed (by emulating) into AMD
         * response - CPUs of AMD can't behave like Intel.
         */
	if (ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx &&
	    ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx &&
	    edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx)
		return false;

	/* AMD ("AuthenticAMD") */
	if (ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx &&
	    ecx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx &&
	    edx == X86EMUL_CPUID_VENDOR_AuthenticAMD_edx)
		return true;

	/* AMD ("AMDisbetter!") */
	if (ebx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx &&
	    ecx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx &&
	    edx == X86EMUL_CPUID_VENDOR_AMDisbetterI_edx)
		return true;

	/* default: (not Intel, not AMD), apply Intel's stricter rules... */
	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephan Bärwolf
124
96.12%
1
25.00%
Yu Zhang
2
1.55%
1
25.00%
Avi Kivity
2
1.55%
1
25.00%
Mathias Krause
1
0.78%
1
25.00%
Total
129
100.00%
4
100.00%



static int em_syscall(struct x86_emulate_ctxt *ctxt)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	struct desc_struct cs, ss;
	u64 msr_data;
	u16 cs_sel, ss_sel;
	u64 efer = 0;

	/* syscall is not available in real mode */
	if (ctxt->mode == X86EMUL_MODE_REAL ||
	    ctxt->mode == X86EMUL_MODE_VM86)
		return emulate_ud(ctxt);

	if (!(em_syscall_is_enabled(ctxt)))
		return emulate_ud(ctxt);

	ops->get_msr(ctxt, MSR_EFER, &efer);
	setup_syscalls_segments(ctxt, &cs, &ss);

	if (!(efer & EFER_SCE))
		return emulate_ud(ctxt);

	ops->get_msr(ctxt, MSR_STAR, &msr_data);
	msr_data >>= 32;
	cs_sel = (u16)(msr_data & 0xfffc);
	ss_sel = (u16)(msr_data + 8);

	if (efer & EFER_LMA) {
		cs.d = 0;
		cs.l = 1;
	}
	ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
	ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);

	*reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip;
	if (efer & EFER_LMA) {
#ifdef CONFIG_X86_64
		*reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags;

		ops->get_msr(ctxt,
			     ctxt->mode == X86EMUL_MODE_PROT64 ?
			     MSR_LSTAR : MSR_CSTAR, &msr_data);
		ctxt->_eip = msr_data;

		ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data);
		ctxt->eflags &= ~msr_data;
		ctxt->eflags |= X86_EFLAGS_FIXED;
#endif
	} else {
		/* legacy mode */
		ops->get_msr(ctxt, MSR_STAR, &msr_data);
		ctxt->_eip = (u32)msr_data;

		ctxt->eflags &= ~(X86_EFLAGS_VM | X86_EFLAGS_IF);
	}

	ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0;
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
269
77.75%
13
54.17%
Stephan Bärwolf
31
8.96%
1
4.17%
Paolo Bonzini
14
4.05%
1
4.17%
Takuya Yoshikawa
10
2.89%
2
8.33%
Laurent Vivier
9
2.60%
2
8.33%
Nadav Amit
7
2.02%
2
8.33%
Gleb Natapov
4
1.16%
1
4.17%
Mathias Krause
1
0.29%
1
4.17%
Wanpeng Li
1
0.29%
1
4.17%
Total
346
100.00%
24
100.00%



static int em_sysenter(struct x86_emulate_ctxt *ctxt)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	struct desc_struct cs, ss;
	u64 msr_data;
	u16 cs_sel, ss_sel;
	u64 efer = 0;

	ops->get_msr(ctxt, MSR_EFER, &efer);
	/* inject #GP if in real mode */
	if (ctxt->mode == X86EMUL_MODE_REAL)
		return emulate_gp(ctxt, 0);

	/*
         * Not recognized on AMD in compat mode (but is recognized in legacy
         * mode).
         */
	if ((ctxt->mode != X86EMUL_MODE_PROT64) && (efer & EFER_LMA)
	    && !vendor_intel(ctxt))
		return emulate_ud(ctxt);

	/* sysenter/sysexit have not been tested in 64bit mode. */
	if (ctxt->mode == X86EMUL_MODE_PROT64)
		return X86EMUL_UNHANDLEABLE;

	setup_syscalls_segments(ctxt, &cs, &ss);

	ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
	if ((msr_data & 0xfffc) == 0x0)
		return emulate_gp(ctxt, 0);

	ctxt->eflags &= ~(X86_EFLAGS_VM | X86_EFLAGS_IF);
	cs_sel = (u16)msr_data & ~SEGMENT_RPL_MASK;
	ss_sel = cs_sel + 8;
	if (efer & EFER_LMA) {
		cs.d = 0;
		cs.l = 1;
	}

	ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
	ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);

	ops->get_msr(ctxt, MSR_IA32_SYSENTER_EIP, &msr_data);
	ctxt->_eip = (efer & EFER_LMA) ? msr_data : (u32)msr_data;

	ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data);
	*reg_write(ctxt, VCPU_REGS_RSP) = (efer & EFER_LMA) ? msr_data :
							      (u32)msr_data;

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
245
83.05%
14
56.00%
Nadav Amit
30
10.17%
4
16.00%
Takuya Yoshikawa
10
3.39%
2
8.00%
Gleb Natapov
7
2.37%
3
12.00%
Laurent Vivier
2
0.68%
1
4.00%
Mathias Krause
1
0.34%
1
4.00%
Total
295
100.00%
25
100.00%



static int em_sysexit(struct x86_emulate_ctxt *ctxt)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	struct desc_struct cs, ss;
	u64 msr_data, rcx, rdx;
	int usermode;
	u16 cs_sel = 0, ss_sel = 0;

	/* inject #GP if in real mode or Virtual 8086 mode */
	if (ctxt->mode == X86EMUL_MODE_REAL ||
	    ctxt->mode == X86EMUL_MODE_VM86)
		return emulate_gp(ctxt, 0);

	setup_syscalls_segments(ctxt, &cs, &ss);

	if ((ctxt->rex_prefix & 0x8) != 0x0)
		usermode = X86EMUL_MODE_PROT64;
	else
		usermode = X86EMUL_MODE_PROT32;

	rcx = reg_read(ctxt, VCPU_REGS_RCX);
	rdx = reg_read(ctxt, VCPU_REGS_RDX);

	cs.dpl = 3;
	ss.dpl = 3;
	ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
	switch (usermode) {
	case X86EMUL_MODE_PROT32:
		cs_sel = (u16)(msr_data + 16);
		if ((msr_data & 0xfffc) == 0x0)
			return emulate_gp(ctxt, 0);
		ss_sel = (u16)(msr_data + 24);
		rcx = (u32)rcx;
		rdx = (u32)rdx;
		break;
	case X86EMUL_MODE_PROT64:
		cs_sel = (u16)(msr_data + 32);
		if (msr_data == 0x0)
			return emulate_gp(ctxt, 0);
		ss_sel = cs_sel + 8;
		cs.d = 0;
		cs.l = 1;
		if (emul_is_noncanonical_address(rcx, ctxt) ||
		    emul_is_noncanonical_address(rdx, ctxt))
			return emulate_gp(ctxt, 0);
		break;
	}
	cs_sel |= SEGMENT_RPL_MASK;
	ss_sel |= SEGMENT_RPL_MASK;

	ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
	ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);

	ctxt->_eip = rdx;
	*reg_write(ctxt, VCPU_REGS_RSP) = rcx;

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
251
74.48%
12
52.17%
Nadav Amit
58
17.21%
3
13.04%
Takuya Yoshikawa
10
2.97%
2
8.70%
Yu Zhang
6
1.78%
1
4.35%
Xiao Guangrong
4
1.19%
1
4.35%
Gleb Natapov
4
1.19%
1
4.35%
Guillaume Thouvenin
2
0.59%
1
4.35%
Mathias Krause
1
0.30%
1
4.35%
Laurent Vivier
1
0.30%
1
4.35%
Total
337
100.00%
23
100.00%



static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt)
{
	int iopl;
	if (ctxt->mode == X86EMUL_MODE_REAL)
		return false;
	if (ctxt->mode == X86EMUL_MODE_VM86)
		return true;
	iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> X86_EFLAGS_IOPL_BIT;
	return ctxt->ops->cpl(ctxt) > iopl;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
57
95.00%
3
60.00%
Takuya Yoshikawa
2
3.33%
1
20.00%
Nadav Amit
1
1.67%
1
20.00%
Total
60
100.00%
5
100.00%



static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt,
					    u16 port, u16 len)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	struct desc_struct tr_seg;
	u32 base3;
	int r;
	u16 tr, io_bitmap_ptr, perm, bit_idx = port & 0x7;
	unsigned mask = (1 << len) - 1;
	unsigned long base;

	ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR);
	if (!tr_seg.p)
		return false;
	if (desc_limit_scaled(&tr_seg) < 103)
		return false;
	base = get_desc_base(&tr_seg);
#ifdef CONFIG_X86_64
	base |= ((u64)base3) << 32;
#endif
	r = ops->read_std(ctxt, base + 102, &io_bitmap_ptr, 2, NULL);
	if (r != X86EMUL_CONTINUE)
		return false;
	if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg))
		return false;
	r = ops->read_std(ctxt, base + io_bitmap_ptr + port/8, &perm, 2, NULL);
	if (r != X86EMUL_CONTINUE)
		return false;
	if ((perm >> bit_idx) & mask)
		return false;
	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
177
78.67%
7
63.64%
Gleb Natapov
38
16.89%
2
18.18%
Takuya Yoshikawa
9
4.00%
1
9.09%
Mathias Krause
1
0.44%
1
9.09%
Total
225
100.00%
11
100.00%



static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt,
				 u16 port, u16 len)
{
	if (ctxt->perm_ok)
		return true;

	if (emulator_bad_iopl(ctxt))
		if (!emulator_io_port_access_allowed(ctxt, port, len))
			return false;

	ctxt->perm_ok = true;

	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
42
73.68%
4
80.00%
Gleb Natapov
15
26.32%
1
20.00%
Total
57
100.00%
5
100.00%



static void string_registers_quirk(struct x86_emulate_ctxt *ctxt)
{
	/*
         * Intel CPUs mask the counter and pointers in quite strange
         * manner when ECX is zero due to REP-string optimizations.
         */
#ifdef CONFIG_X86_64
	if (ctxt->ad_bytes != 4 || !vendor_intel(ctxt))
		return;

	*reg_write(ctxt, VCPU_REGS_RCX) = 0;

	switch (ctxt->b) {
	case 0xa4:	/* movsb */
	case 0xa5:	/* movsd/w */
		*reg_rmw(ctxt, VCPU_REGS_RSI) &= (u32)-1;
		/* fall through */
	case 0xaa:	/* stosb */
	case 0xab:	/* stosd/w */
		*reg_rmw(ctxt, VCPU_REGS_RDI) &= (u32)-1;
	}
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nadav Amit
95
100.00%
1
100.00%
Total
95
100.00%
1
100.00%



static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt,
				struct tss_segment_16 *tss)
{
	tss->ip = ctxt->_eip;
	tss->flag = ctxt->eflags;
	tss->ax = reg_read(ctxt, VCPU_REGS_RAX);
	tss->cx = reg_read(ctxt, VCPU_REGS_RCX);
	tss->dx = reg_read(ctxt, VCPU_REGS_RDX);
	tss->bx = reg_read(ctxt, VCPU_REGS_RBX);
	tss->sp = reg_read(ctxt, VCPU_REGS_RSP);
	tss->bp = reg_read(ctxt, VCPU_REGS_RBP);
	tss->si = reg_read(ctxt, VCPU_REGS_RSI);
	tss->di = reg_read(ctxt, VCPU_REGS_RDI);

	tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
	tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
	tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
	tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
	tss->ldt = get_segment_selector(ctxt, VCPU_SREG_LDTR);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
175
100.00%
10
100.00%
Total
175
100.00%
10
100.00%



static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt,
				 struct tss_segment_16 *tss)
{
	int ret;
	u8 cpl;

	ctxt->_eip = tss->ip;
	ctxt->eflags = tss->flag | 2;
	*reg_write(ctxt, VCPU_REGS_RAX) = tss->ax;
	*reg_write(ctxt, VCPU_REGS_RCX) = tss->cx;
	*reg_write(ctxt, VCPU_REGS_RDX) = tss->dx;
	*reg_write(ctxt, VCPU_REGS_RBX) = tss->bx;
	*reg_write(ctxt, VCPU_REGS_RSP) = tss->sp;
	*reg_write(ctxt, VCPU_REGS_RBP) = tss->bp;
	*reg_write(ctxt, VCPU_REGS_RSI) = tss->si;
	*reg_write(ctxt, VCPU_REGS_RDI) = tss->di;

	/*
         * SDM says that segment selectors are loaded before segment
         * descriptors
         */
	set_segment_selector(ctxt, tss->ldt, VCPU_SREG_LDTR);
	set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
	set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
	set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
	set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);

	cpl = tss->cs & 3;

	/*
         * Now load segment descriptors. If fault happens at this stage
         * it is handled in a context of new task
         */
	ret = __load_segment_descriptor(ctxt, tss->ldt, VCPU_SREG_LDTR, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
281
81.69%
10
50.00%
Paolo Bonzini
31
9.01%
2
10.00%
Nadav Amit
15
4.36%
2
10.00%
Gleb Natapov
11
3.20%
2
10.00%
Wei Yongjun
2
0.58%
1
5.00%
Aurelien Jarno
2
0.58%
1
5.00%
Laurent Vivier
1
0.29%
1
5.00%
Guo Chao
1
0.29%
1
5.00%
Total
344
100.00%
20
100.00%



static int task_switch_16(struct x86_emulate_ctxt *ctxt,
			  u16 tss_selector, u16 old_tss_sel,
			  ulong old_tss_base, struct desc_struct *new_desc)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	struct tss_segment_16 tss_seg;
	int ret;
	u32 new_tss_base = get_desc_base(new_desc);

	ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
			    &ctxt->exception);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	save_state_to_tss16(ctxt, &tss_seg);

	ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
			     &ctxt->exception);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
			    &ctxt->exception);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	if (old_tss_sel != 0xffff) {
		tss_seg.prev_task_link = old_tss_sel;

		ret = ops->write_std(ctxt, new_tss_base,
				     &tss_seg.prev_task_link,
				     sizeof tss_seg.prev_task_link,
				     &ctxt->exception);
		if (ret != X86EMUL_CONTINUE)
			return ret;
	}

	return load_state_from_tss16(ctxt, &tss_seg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
187
89.47%
5
45.45%
Takuya Yoshikawa
9
4.31%
1
9.09%
Wei Yongjun
7
3.35%
1
9.09%
Guillaume Thouvenin
3
1.44%
2
18.18%
Gleb Natapov
2
0.96%
1
9.09%
Mathias Krause
1
0.48%
1
9.09%
Total
209
100.00%
11
100.00%



static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt,
				struct tss_segment_32 *tss)
{
	/* CR3 and ldt selector are not saved intentionally */
	tss->eip = ctxt->_eip;
	tss->eflags = ctxt->eflags;
	tss->eax = reg_read(ctxt, VCPU_REGS_RAX);
	tss->ecx = reg_read(ctxt, VCPU_REGS_RCX);
	tss->edx = reg_read(ctxt, VCPU_REGS_RDX);
	tss->ebx = reg_read(ctxt, VCPU_REGS_RBX);
	tss->esp = reg_read(ctxt, VCPU_REGS_RSP);
	tss->ebp = reg_read(ctxt, VCPU_REGS_RBP);
	tss->esi = reg_read(ctxt, VCPU_REGS_RSI);
	tss->edi = reg_read(ctxt, VCPU_REGS_RDI);

	tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
	tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
	tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
	tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
	tss->fs = get_segment_selector(ctxt, VCPU_SREG_FS);
	tss->gs = get_segment_selector(ctxt, VCPU_SREG_GS);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
172
91.98%
8
53.33%
Gleb Natapov
9
4.81%
3
20.00%
Guillaume Thouvenin
4
2.14%
2
13.33%
Nadav Amit
1
0.53%
1
6.67%
Laurent Vivier
1
0.53%
1
6.67%
Total
187
100.00%
15
100.00%



static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt,
				 struct tss_segment_32 *tss)
{
	int ret;
	u8 cpl;

	if (ctxt->ops->set_cr(ctxt, 3, tss->cr3))
		return emulate_gp(ctxt, 0);
	ctxt->_eip = tss->eip;
	ctxt->eflags = tss->eflags | 2;

	/* General purpose registers */
	*reg_write(ctxt, VCPU_REGS_RAX) = tss->eax;
	*reg_write(ctxt, VCPU_REGS_RCX) = tss->ecx;
	*reg_write(ctxt, VCPU_REGS_RDX) = tss->edx;
	*reg_write(ctxt, VCPU_REGS_RBX) = tss->ebx;
	*reg_write(ctxt, VCPU_REGS_RSP) = tss->esp;
	*reg_write(ctxt, VCPU_REGS_RBP) = tss->ebp;
	*reg_write(ctxt, VCPU_REGS_RSI) = tss->esi;
	*reg_write(ctxt, VCPU_REGS_RDI) = tss->edi;

	/*
         * SDM says that segment selectors are loaded before segment
         * descriptors.  This is important because CPL checks will
         * use CS.RPL.
         */
	set_segment_selector(ctxt, tss->ldt_selector, VCPU_SREG_LDTR);
	set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
	set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
	set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
	set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);
	set_segment_selector(ctxt, tss->fs, VCPU_SREG_FS);
	set_segment_selector(ctxt, tss->gs, VCPU_SREG_GS);

	/*
         * If we're switching between Protected Mode and VM86, we need to make
         * sure to update the mode before loading the segment descriptors so
         * that the selectors are interpreted correctly.
         */
	if (ctxt->eflags & X86_EFLAGS_VM) {
		ctxt->mode = X86EMUL_MODE_VM86;
		cpl = 3;
	} else {
		ctxt->mode = X86EMUL_MODE_PROT32;
		cpl = tss->cs & 3;
	}

	/*
         * Now load segment descriptors. If fault happenes at this stage
         * it is handled in a context of new task
         */
	ret = __load_segment_descriptor(ctxt, tss->ldt_selector, VCPU_SREG_LDTR,
					cpl, X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->fs, VCPU_SREG_FS, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = __load_segment_descriptor(ctxt, tss->gs, VCPU_SREG_GS, cpl,
					X86_TRANSFER_TASK_SWITCH, NULL);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
334
71.22%
8
38.10%
Paolo Bonzini
47
10.02%
2
9.52%
Gleb Natapov
38
8.10%
5
23.81%
Kevin Wolf
24
5.12%
1
4.76%
Nadav Amit
21
4.48%
2
9.52%
Guillaume Thouvenin
2
0.43%
1
4.76%
Takuya Yoshikawa
2
0.43%
1
4.76%
Laurent Vivier
1
0.21%
1
4.76%
Total
469
100.00%
21
100.00%



static int task_switch_32(struct x86_emulate_ctxt *ctxt,
			  u16 tss_selector, u16 old_tss_sel,
			  ulong old_tss_base, struct desc_struct *new_desc)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	struct tss_segment_32 tss_seg;
	int ret;
	u32 new_tss_base = get_desc_base(new_desc);
	u32 eip_offset = offsetof(struct tss_segment_32, eip);
	u32 ldt_sel_offset = offsetof(struct tss_segment_32, ldt_selector);

	ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
			    &ctxt->exception);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	save_state_to_tss32(ctxt, &tss_seg);

	/* Only GP registers and segment selectors are saved */
	ret = ops->write_std(ctxt, old_tss_base + eip_offset, &tss_seg.eip,
			     ldt_sel_offset - eip_offset, &ctxt->exception);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
			    &ctxt->exception);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	if (old_tss_sel != 0xffff) {
		tss_seg.prev_task_link = old_tss_sel;

		ret = ops->write_std(ctxt, new_tss_base,
				     &tss_seg.prev_task_link,
				     sizeof tss_seg.prev_task_link,
				     &ctxt->exception);
		if (ret != X86EMUL_CONTINUE)
			return ret;
	}

	return load_state_from_tss32(ctxt, &tss_seg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
183
77.22%
6
50.00%
Nadav Amit
30
12.66%
1
8.33%
Laurent Vivier
9
3.80%
2
16.67%
Takuya Yoshikawa
9
3.80%
1
8.33%
Gleb Natapov
5
2.11%
1
8.33%
Mathias Krause
1
0.42%
1
8.33%
Total
237
100.00%
12
100.00%



static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
				   u16 tss_selector, int idt_index, int reason,
				   bool has_error_code, u32 error_code)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	struct desc_struct curr_tss_desc, next_tss_desc;
	int ret;
	u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR);
	ulong old_tss_base =
		ops->get_cached_segment_base(ctxt, VCPU_SREG_TR);
	u32 desc_limit;
	ulong desc_addr, dr7;

	/* FIXME: old_tss_base == ~0 ? */

	ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc, &desc_addr);
	if (ret != X86EMUL_CONTINUE)
		return ret;
	ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc, &desc_addr);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	/* FIXME: check that next_tss_desc is tss */

	/*
         * Check privileges. The three cases are task switch caused by...
         *
         * 1. jmp/call/int to task gate: Check against DPL of the task gate
         * 2. Exception/IRQ/iret: No check is performed
         * 3. jmp/call to TSS/task-gate: No check is performed since the
         *    hardware checks it before exiting.
         */
	if (reason == TASK_SWITCH_GATE) {
		if (idt_index != -1) {
			/* Software interrupts */
			struct desc_struct task_gate_desc;
			int dpl;

			ret = read_interrupt_descriptor(ctxt, idt_index,
							&task_gate_desc);
			if (ret != X86EMUL_CONTINUE)
				return ret;

			dpl = task_gate_desc.dpl;
			if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl)
				return emulate_gp(ctxt, (idt_index << 3) | 0x2);
		}
	}

	desc_limit = desc_limit_scaled(&next_tss_desc);
	if (!next_tss_desc.p ||
	    ((desc_limit < 0x67 && (next_tss_desc.type & 8)) ||
	     desc_limit < 0x2b)) {
		return emulate_ts(ctxt, tss_selector & 0xfffc);
	}

	if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
		curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */
		write_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc);
	}

	if (reason == TASK_SWITCH_IRET)
		ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT;

	/* set back link to prev task only if NT bit is set in eflags
           note that old_tss_sel is not used after this point */
	if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
		old_tss_sel = 0xffff;

	if (next_tss_desc.type & 8)
		ret = task_switch_32(ctxt, tss_selector, old_tss_sel,
				     old_tss_base, &next_tss_desc);
	else
		ret = task_switch_16(ctxt, tss_selector, old_tss_sel,
				     old_tss_base, &next_tss_desc);
	if (ret != X86EMUL_CONTINUE)
		return ret;

	if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE)
		ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT;

	if (reason != TASK_SWITCH_IRET) {
		next_tss_desc.type |= (1 << 1); /* set busy flag */
		write_segment_descriptor(ctxt, tss_selector, &next_tss_desc);
	}

	ops->set_cr(ctxt, 0,  ops->get_cr(ctxt, 0) | X86_CR0_TS);
	ops->set_segment(ctxt, tss_selector, &next_tss_desc, 0, VCPU_SREG_TR);

	if (has_error_code) {
		ctxt->op_bytes = ctxt->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2;
		ctxt->lock_prefix = 0;
		ctxt->src.val = (unsigned long) error_code;
		ret = em_push(ctxt);
	}

	ops->get_dr(ctxt, 7, &dr7);
	ops->set_dr(ctxt, 7, dr7 & ~(DR_LOCAL_ENABLE_MASK | DR_LOCAL_SLOWDOWN));

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
372
68.51%
7
33.33%
Kevin Wolf
65
11.97%
1
4.76%
Gleb Natapov
44
8.10%
3
14.29%
Nadav Amit
33
6.08%
2
9.52%
Mohammed Gamal
14
2.58%
2
9.52%
Takuya Yoshikawa
12
2.21%
3
14.29%
Paolo Bonzini
1
0.18%
1
4.76%
Mathias Krause
1
0.18%
1
4.76%
Guo Chao
1
0.18%
1
4.76%
Total
543
100.00%
21
100.00%



int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
			 u16 tss_selector, int idt_index, int reason,
			 bool has_error_code, u32 error_code)
{
	int rc;

	invalidate_registers(ctxt);
	ctxt->_eip = ctxt->eip;
	ctxt->dst.type = OP_NONE;

	rc = emulator_do_task_switch(ctxt, tss_selector, idt_index, reason,
				     has_error_code, error_code);

	if (rc == X86EMUL_CONTINUE) {
		ctxt->eip = ctxt->_eip;
		writeback_registers(ctxt);
	}

	return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
83
84.69%
5
55.56%
Mohammed Gamal
7
7.14%
1
11.11%
Kevin Wolf
5
5.10%
1
11.11%
Gleb Natapov
3
3.06%
2
22.22%
Total
98
100.00%
9
100.00%



static void string_addr_inc(struct x86_emulate_ctxt *ctxt, int reg,
		struct operand *op)
{
	int df = (ctxt->eflags & X86_EFLAGS_DF) ? -op->count : op->count;

	register_address_increment(ctxt, reg, df * op->bytes);
	op->addr.mem.ea = register_address(ctxt, reg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
54
80.60%
6
60.00%
Gleb Natapov
9
13.43%
2
20.00%
Mohammed Gamal
3
4.48%
1
10.00%
Nadav Amit
1
1.49%
1
10.00%
Total
67
100.00%
10
100.00%



static int em_das(struct x86_emulate_ctxt *ctxt)
{
	u8 al, old_al;
	bool af, cf, old_cf;

	cf = ctxt->eflags & X86_EFLAGS_CF;
	al = ctxt->dst.val;

	old_al = al;
	old_cf = cf;
	cf = false;
	af = ctxt->eflags & X86_EFLAGS_AF;
	if ((al & 0x0f) > 9 || af) {
		al -= 6;
		cf = old_cf | (al >= 250);
		af = true;
	} else {
		af = false;
	}
	if (old_al > 0x99 || old_cf) {
		al -= 0x60;
		cf = true;
	}

	ctxt->dst.val = al;
	/* Set PF, ZF, SF */
	ctxt->src.type = OP_IMM;
	ctxt->src.val = 0;
	ctxt->src.bytes = 1;
	fastop(ctxt, em_or);
	ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);
	if (cf)
		ctxt->eflags |= X86_EFLAGS_CF;
	if (af)
		ctxt->eflags |= X86_EFLAGS_AF;
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
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CommitProp
Avi Kivity
190
100.00%
3
100.00%
Total
190
100.00%
3
100.00%



static int em_aam(struct x86_emulate_ctxt *ctxt)
{
	u8 al, ah;

	if (ctxt->src.val == 0)
		return emulate_de(ctxt);

	al = ctxt->dst.val & 0xff;
	ah = al / ctxt->src.val;
	al %= ctxt->src.val;

	ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al | (ah << 8);

	/* Set PF, ZF, SF */
	ctxt->src.type = OP_IMM;
	ctxt->src.val = 0;
	ctxt->src.bytes = 1;
	fastop(ctxt, em_or);

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
119
100.00%
1
100.00%
Total
119
100.00%
1
100.00%



static int em_aad(struct x86_emulate_ctxt *ctxt)
{
	u8 al = ctxt->dst.val & 0xff;
	u8 ah = (ctxt->dst.val >> 8) & 0xff;

	al = (al + (ah * ctxt->src.val)) & 0xff;

	ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al;

	/* Set PF, ZF, SF */
	ctxt->src.type = OP_IMM;
	ctxt->src.val = 0;
	ctxt->src.bytes = 1;
	fastop(ctxt, em_or);

	return X86EMUL_CONTINUE;
}

Contributors
Person
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Gleb Natapov
108
100.00%
2
100.00%
Total
108
100.00%
2
100.00%



static int em_call(struct x86_emulate_ctxt *ctxt)
{
	int rc;
	long rel = ctxt->src.val;

	ctxt->src.val = (unsigned long)ctxt->_eip;
	rc = jmp_rel(ctxt, rel);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	return em_push(ctxt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takuya Yoshikawa
47
77.05%
1
50.00%
Nadav Amit
14
22.95%
1
50.00%
Total
61
100.00%
2
100.00%



static int em_call_far(struct x86_emulate_ctxt *ctxt)
{
	u16 sel, old_cs;
	ulong old_eip;
	int rc;
	struct desc_struct old_desc, new_desc;
	const struct x86_emulate_ops *ops = ctxt->ops;
	int cpl = ctxt->ops->cpl(ctxt);
	enum x86emul_mode prev_mode = ctxt->mode;

	old_eip = ctxt->_eip;
	ops->get_segment(ctxt, &old_cs, &old_desc, NULL, VCPU_SREG_CS);

	memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
	rc = __load_segment_descriptor(ctxt, sel, VCPU_SREG_CS, cpl,
				       X86_TRANSFER_CALL_JMP, &new_desc);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc);
	if (rc != X86EMUL_CONTINUE)
		goto fail;

	ctxt->src.val = old_cs;
	rc = em_push(ctxt);
	if (rc != X86EMUL_CONTINUE)
		goto fail;

	ctxt->src.val = old_eip;
	rc = em_push(ctxt);
	/* If we failed, we tainted the memory, but the very least we should
           restore cs */
	if (rc != X86EMUL_CONTINUE) {
		pr_warn_once("faulting far call emulation tainted memory\n");
		goto fail;
	}
	return rc;
fail:
	ops->set_segment(ctxt, old_cs, &old_desc, 0, VCPU_SREG_CS);
	ctxt->mode = prev_mode;
	return rc;

}

Contributors
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Nadav Amit
133
56.12%
5
55.56%
Avi Kivity
102
43.04%
3
33.33%
Takuya Yoshikawa
2
0.84%
1
11.11%
Total
237
100.00%
9
100.00%



static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
{
	int rc;
	unsigned long eip;

	rc = emulate_pop(ctxt, &eip, ctxt->op_bytes);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	rc = assign_eip_near(ctxt, eip);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	rsp_increment(ctxt, ctxt->src.val);
	return X86EMUL_CONTINUE;
}

Contributors
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Avi Kivity
51
69.86%
3
75.00%
Nadav Amit
22
30.14%
1
25.00%
Total
73
100.00%
4
100.00%



static int em_xchg(struct x86_emulate_ctxt *ctxt)
{
	/* Write back the register source. */
	ctxt->src.val = ctxt->dst.val;
	write_register_operand(&ctxt->src);

	/* Write back the memory destination with implicit LOCK prefix. */
	ctxt->dst.val = ctxt->src.orig_val;
	ctxt->lock_prefix = 1;
	return X86EMUL_CONTINUE;
}

Contributors
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Takuya Yoshikawa
48
88.89%
1
50.00%
Avi Kivity
6
11.11%
1
50.00%
Total
54
100.00%
2
100.00%



static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
{
	ctxt->dst.val = ctxt->src2.val;
	return fastop(ctxt, em_imul);
}

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Avi Kivity
31
100.00%
3
100.00%
Total
31
100.00%
3
100.00%



static int em_cwd(struct x86_emulate_ctxt *ctxt)
{
	ctxt->dst.type = OP_REG;
	ctxt->dst.bytes = ctxt->src.bytes;
	ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
	ctxt->dst.val = ~((ctxt->src.val >> (ctxt->src.bytes * 8 - 1)) - 1);

	return X86EMUL_CONTINUE;
}

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Avi Kivity
80
100.00%
3
100.00%
Total
80
100.00%
3
100.00%



static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
{
	u64 tsc = 0;

	ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc);
	*reg_write(ctxt, VCPU_REGS_RAX) = (u32)tsc;
	*reg_write(ctxt, VCPU_REGS_RDX) = tsc >> 32;
	return X86EMUL_CONTINUE;
}

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Avi Kivity
58
100.00%
3
100.00%
Total
58
100.00%
3
100.00%



static int em_rdpmc(struct x86_emulate_ctxt *ctxt)
{
	u64 pmc;

	if (ctxt->ops->read_pmc(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &pmc))
		return emulate_gp(ctxt, 0);
	*reg_write(ctxt, VCPU_REGS_RAX) = (u32)pmc;
	*reg_write(ctxt, VCPU_REGS_RDX) = pmc >> 32;
	return X86EMUL_CONTINUE;
}

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Avi Kivity
71
100.00%
2
100.00%
Total
71
100.00%
2
100.00%



static int em_mov(struct x86_emulate_ctxt *ctxt)
{
	memcpy(ctxt->dst.valptr, ctxt->src.valptr, sizeof(ctxt->src.valptr));
	return X86EMUL_CONTINUE;
}

Contributors
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Avi Kivity
23
60.53%
2
50.00%
Stefan Hajnoczi
9
23.68%
1
25.00%
Paolo Bonzini
6
15.79%
1
25.00%
Total
38
100.00%
4
100.00%


#define FFL(x) bit(X86_FEATURE_##x)



static int em_movbe(struct x86_emulate_ctxt *ctxt)
{
	u32 ebx, ecx, edx, eax = 1;
	u16 tmp;

	/*
         * Check MOVBE is set in the guest-visible CPUID leaf.
         */
	ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx, false);
	if (!(ecx & FFL(MOVBE)))
		return emulate_ud(ctxt);

	switch (ctxt->op_bytes) {
	case 2:
		/*
                 * From MOVBE definition: "...When the operand size is 16 bits,
                 * the upper word of the destination register remains unchanged
                 * ..."
                 *
                 * Both casting ->valptr and ->val to u16 breaks strict aliasing
                 * rules so we have to do the operation almost per hand.
                 */
		tmp = (u16)ctxt->src.val;
		ctxt->dst.val &= ~0xffffUL;
		ctxt->dst.val |= (unsigned long)swab16(tmp);
		break;
	case 4:
		ctxt->dst.val = swab32((u32)ctxt->src.val);
		break;
	case 8:
		ctxt->dst.val = swab64(ctxt->src.val);
		break;
	default:
		BUG();
	}
	return X86EMUL_CONTINUE;
}

Contributors
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Borislav Petkov
158
96.93%
1
33.33%
Paolo Bonzini
3
1.84%
1
33.33%
Yu Zhang
2
1.23%
1
33.33%
Total
163
100.00%
3
100.00%



static int em_cr_write(struct x86_emulate_ctxt *ctxt)
{
	if (ctxt->ops->set_cr(ctxt, ctxt->modrm_reg, ctxt->src.val))
		return emulate_gp(ctxt, 0);

	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return X86EMUL_CONTINUE;
}

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Takuya Yoshikawa
52
100.00%
1
100.00%
Total
52
100.00%
1
100.00%



static int em_dr_write(struct x86_emulate_ctxt *ctxt)
{
	unsigned long val;

	if (ctxt->mode == X86EMUL_MODE_PROT64)
		val = ctxt->src.val & ~0ULL;
	else
		val = ctxt->src.val & ~0U;

	/* #UD condition is already handled. */
	if (ctxt->ops->set_dr(ctxt, ctxt->modrm_reg, val) < 0)
		return emulate_gp(ctxt, 0);

	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return X86EMUL_CONTINUE;
}

Contributors
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Takuya Yoshikawa
86
100.00%
1
100.00%
Total
86
100.00%
1
100.00%



static int em_wrmsr(struct x86_emulate_ctxt *ctxt)
{
	u64 msr_data;

	msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX)
		| ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32);
	if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data))
		return emulate_gp(ctxt, 0);

	return X86EMUL_CONTINUE;
}

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Takuya Yoshikawa
59
83.10%
1
50.00%
Avi Kivity
12
16.90%
1
50.00%
Total
71
100.00%
2
100.00%



static int em_rdmsr(struct x86_emulate_ctxt *ctxt)
{
	u64 msr_data;

	if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data))
		return emulate_gp(ctxt, 0);

	*reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data;
	*reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32;
	return X86EMUL_CONTINUE;
}

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Takuya Yoshikawa
57
80.28%
1
50.00%
Avi Kivity
14
19.72%
1
50.00%
Total
71
100.00%
2
100.00%



static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt)
{
	if (ctxt->modrm_reg > VCPU_SREG_GS)
		return emulate_ud(ctxt);

	ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg);
	if (ctxt->dst.bytes == 4 && ctxt->dst.type == OP_MEM)
		ctxt->dst.bytes = 2;
	return X86EMUL_CONTINUE;
}

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Takuya Yoshikawa
40
57.97%
1
33.33%
Nadav Amit
26
37.68%
1
33.33%
Avi Kivity
3
4.35%
1
33.33%
Total
69
100.00%
3
100.00%



static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
{
	u16 sel = ctxt->src.val;

	if (ctxt->modrm_reg == VCPU_SREG_CS || ctxt->modrm_reg > VCPU_SREG_GS)
		return emulate_ud(ctxt);

	if (ctxt->modrm_reg == VCPU_SREG_SS)
		ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;

	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg);
}

Contributors
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Takuya Yoshikawa
69
92.00%
1
50.00%
Avi Kivity
6
8.00%
1
50.00%
Total
75
100.00%
2
100.00%



static int em_lldt(struct x86_emulate_ctxt *ctxt)
{
	u16 sel = ctxt->src.val;

	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR);
}

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Avi Kivity
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%



static int em_ltr(struct x86_emulate_ctxt *ctxt)
{
	u16 sel = ctxt->src.val;

	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return load_segment_descriptor(ctxt, sel, VCPU_SREG_TR);
}

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Avi Kivity
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%



static int em_invlpg(struct x86_emulate_ctxt *ctxt)
{
	int rc;
	ulong linear;

	rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear);
	if (rc == X86EMUL_CONTINUE)
		ctxt->ops->invlpg(ctxt, linear);
	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return X86EMUL_CONTINUE;
}

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Avi Kivity
68
100.00%
5
100.00%
Total
68
100.00%
5
100.00%



static int em_clts(struct x86_emulate_ctxt *ctxt)
{
	ulong cr0;

	cr0 = ctxt->ops->get_cr(ctxt, 0);
	cr0 &= ~X86_CR0_TS;
	ctxt->ops->set_cr(ctxt, 0, cr0);
	return X86EMUL_CONTINUE;
}

Contributors
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Avi Kivity
48
100.00%
1
100.00%
Total
48
100.00%
1
100.00%



static int em_hypercall(struct x86_emulate_ctxt *ctxt)
{
	int rc = ctxt->ops->fix_hypercall(ctxt);

	if (rc != X86EMUL_CONTINUE)
		return rc;

	/* Let the processor re-execute the fixed hypercall */
	ctxt->_eip = ctxt->eip;
	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
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CommitProp
Avi Kivity
50
94.34%
3
60.00%
Nadav Amit
2
3.77%
1
20.00%
Jan Kiszka
1
1.89%
1
20.00%
Total
53
100.00%
5
100.00%



static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt,
				  void (*get)(struct x86_emulate_ctxt *ctxt,
					      struct desc_ptr *ptr))
{
	struct desc_ptr desc_ptr;

	if (ctxt->mode == X86EMUL_MODE_PROT64)
		ctxt->op_bytes = 8;
	get(ctxt, &desc_ptr);
	if (ctxt->op_bytes == 2) {
		ctxt->op_bytes = 4;
		desc_ptr.address &= 0x00ffffff;
	}
	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return segmented_write_std(ctxt, ctxt->dst.addr.mem,
				   &desc_ptr, 2 + ctxt->op_bytes);
}

Contributors
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Avi Kivity
107
99.07%
1
50.00%
Steve Rutherford
1
0.93%
1
50.00%
Total
108
100.00%
2
100.00%



static int em_sgdt(struct x86_emulate_ctxt *ctxt)
{
	return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt);
}

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Avi Kivity
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%



static int em_sidt(struct x86_emulate_ctxt *ctxt)
{
	return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt);
}

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Avi Kivity
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%



static int em_lgdt_lidt(struct x86_emulate_ctxt *ctxt, bool lgdt)
{
	struct desc_ptr desc_ptr;
	int rc;

	if (ctxt->mode == X86EMUL_MODE_PROT64)
		ctxt->op_bytes = 8;
	rc = read_descriptor(ctxt, ctxt->src.addr.mem,
			     &desc_ptr.size, &desc_ptr.address,
			     ctxt->op_bytes);
	if (rc != X86EMUL_CONTINUE)
		return rc;
	if (ctxt->mode == X86EMUL_MODE_PROT64 &&
	    emul_is_noncanonical_address(desc_ptr.address, ctxt))
		return emulate_gp(ctxt, 0);
	if (lgdt)
		ctxt->ops->set_gdt(ctxt, &desc_ptr);
	else
		ctxt->ops->set_idt(ctxt, &desc_ptr);
	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return X86EMUL_CONTINUE;
}

Contributors
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Avi Kivity
93
66.91%
3
50.00%
Nadav Amit
43
30.94%
2
33.33%
Yu Zhang
3
2.16%
1
16.67%
Total
139
100.00%
6
100.00%



static int em_lgdt(struct x86_emulate_ctxt *ctxt)
{
	return em_lgdt_lidt(ctxt, true);
}

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Nadav Amit
17
89.47%
1
50.00%
Avi Kivity
2
10.53%
1
50.00%
Total
19
100.00%
2
100.00%



static int em_lidt(struct x86_emulate_ctxt *ctxt)
{
	return em_lgdt_lidt(ctxt, false);
}

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Avi Kivity
17
89.47%
1
50.00%
Nadav Amit
2
10.53%
1
50.00%
Total
19
100.00%
2
100.00%



static int em_smsw(struct x86_emulate_ctxt *ctxt)
{
	if (ctxt->dst.type == OP_MEM)
		ctxt->dst.bytes = 2;
	ctxt->dst.val = ctxt->ops->get_cr(ctxt, 0);
	return X86EMUL_CONTINUE;
}

Contributors
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Avi Kivity
39
79.59%
2
66.67%
Nadav Amit
10
20.41%
1
33.33%
Total
49
100.00%
3
100.00%



static int em_lmsw(struct x86_emulate_ctxt *ctxt)
{
	ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul)
			  | (ctxt->src.val & 0x0f));
	ctxt->dst.type = OP_NONE;
	return X86EMUL_CONTINUE;
}

Contributors
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Avi Kivity
59
100.00%
2
100.00%
Total
59
100.00%
2
100.00%



static int em_loop(struct x86_emulate_ctxt *ctxt)
{
	int rc = X86EMUL_CONTINUE;

	register_address_increment(ctxt, VCPU_REGS_RCX, -1);
	if ((address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) != 0) &&
	    (ctxt->b == 0xe2 || test_cc(ctxt->b ^ 0x5, ctxt->eflags)))
		rc = jmp_rel(ctxt, ctxt->src.val);

	return rc;
}

Contributors
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Takuya Yoshikawa
62
76.54%
1
25.00%
Avi Kivity
11
13.58%
2
50.00%
Nadav Amit
8
9.88%
1
25.00%
Total
81
100.00%
4
100.00%



static int em_jcxz(struct x86_emulate_ctxt *ctxt)
{
	int rc = X86EMUL_CONTINUE;

	if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0)
		rc = jmp_rel(ctxt, ctxt->src.val);

	return rc;
}

Contributors
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Takuya Yoshikawa
32
66.67%
1
25.00%
Avi Kivity
8
16.67%
2
50.00%
Nadav Amit
8
16.67%
1
25.00%
Total
48
100.00%
4
100.00%



static int em_in(struct x86_emulate_ctxt *ctxt)
{
	if (!pio_in_emulated(ctxt, ctxt->dst.bytes, ctxt->src.val,
			     &ctxt->dst.val))
		return X86EMUL_IO_NEEDED;

	return X86EMUL_CONTINUE;
}

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Takuya Yoshikawa
44
100.00%
1
100.00%
Total
44
100.00%
1
100.00%



static int em_out(struct x86_emulate_ctxt *ctxt)
{
	ctxt->ops->pio_out_emulated(ctxt, ctxt->src.bytes, ctxt->dst.val,
				    &ctxt->src.val, 1);
	/* Disable writeback. */
	ctxt->dst.type = OP_NONE;
	return X86EMUL_CONTINUE;
}

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Takuya Yoshikawa
53
100.00%
1
100.00%
Total
53
100.00%
1
100.00%



static int em_cli(struct x86_emulate_ctxt *ctxt)
{
	if (emulator_bad_iopl(ctxt))
		return emulate_gp(ctxt, 0);

	ctxt->eflags &= ~X86_EFLAGS_IF;
	return X86EMUL_CONTINUE;
}

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Takuya Yoshikawa
36
100.00%
1
100.00%
Total
36
100.00%
1
100.00%



static int em_sti(struct x86_emulate_ctxt *ctxt)
{
	if (emulator_bad_iopl(ctxt))
		return emulate_gp(ctxt, 0);

	ctxt->interruptibility = KVM_X86_SHADOW_INT_STI;
	ctxt->eflags |= X86_EFLAGS_IF;
	return X86EMUL_CONTINUE;
}

Contributors
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Takuya Yoshikawa
41
100.00%
1
100.00%
Total
41
100.00%
1
100.00%



static int em_cpuid(struct x86_emulate_ctxt *ctxt)
{
	u32 eax, ebx, ecx, edx;
	u64 msr = 0;

	ctxt->ops->get_msr(ctxt, MSR_MISC_FEATURES_ENABLES, &msr);
	if (msr & MSR_MISC_FEATURES_ENABLES_CPUID_FAULT &&
	    ctxt->ops->cpl(ctxt)) {
		return emulate_gp(ctxt, 0);
	}

	eax = reg_read(ctxt, VCPU_REGS_RAX);
	ecx = reg_read(ctxt, VCPU_REGS_RCX);
	ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx, true);
	*reg_write(ctxt, VCPU_REGS_RAX) = eax;
	*reg_write(ctxt, VCPU_REGS_RBX) = ebx;
	*reg_write(ctxt, VCPU_REGS_RCX) = ecx;
	*reg_write(ctxt, VCPU_REGS_RDX) = edx;
	return X86EMUL_CONTINUE;
}

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Avi Kivity
102
68.92%
2
50.00%
Kyle Huey
44
29.73%
1
25.00%
Yu Zhang
2
1.35%
1
25.00%
Total
148
100.00%
4
100.00%



static int em_sahf(struct x86_emulate_ctxt *ctxt)
{
	u32 flags;

	flags = X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
		X86_EFLAGS_SF;
	flags &= *reg_rmw(ctxt, VCPU_REGS_RAX) >> 8;

	ctxt->eflags &= ~0xffUL;
	ctxt->eflags |= flags | X86_EFLAGS_FIXED;
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Bonzini
51
91.07%
1
50.00%
Nadav Amit
5
8.93%
1
50.00%
Total
56
100.00%
2
100.00%



static int em_lahf(struct x86_emulate_ctxt *ctxt)
{
	*reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL;
	*reg_rmw(ctxt, VCPU_REGS_RAX) |= (ctxt->eflags & 0xff) << 8;
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
43
100.00%
2
100.00%
Total
43
100.00%
2
100.00%



static int em_bswap(struct x86_emulate_ctxt *ctxt)
{
	switch (ctxt->op_bytes) {
#ifdef CONFIG_X86_64
	case 8:
		asm("bswap %0" : "+r"(ctxt->dst.val));
		break;
#endif
	default:
		asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val));
		break;
	}
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
35
100.00%
1
100.00%
Total
35
100.00%
1
100.00%



static int em_clflush(struct x86_emulate_ctxt *ctxt)
{
	/* emulating clflush regardless of cpuid */
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nadav Amit
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



static int em_movsxd(struct x86_emulate_ctxt *ctxt)
{
	ctxt->dst.val = (s32) ctxt->src.val;
	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nadav Amit
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%



static int check_fxsr(struct x86_emulate_ctxt *ctxt)
{
	u32 eax = 1, ebx, ecx = 0, edx;

	ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx, false);
	if (!(edx & FFL(FXSR)))
		return emulate_ud(ctxt);

	if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
		return emulate_nm(ctxt);

	/*
         * Don't emulate a case that should never be hit, instead of working
         * around a lack of fxsave64/fxrstor64 on old compilers.
         */
	if (ctxt->mode >= X86EMUL_MODE_PROT64)
		return X86EMUL_UNHANDLEABLE;

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Radim Krčmář
77
73.33%
1
25.00%
Joerg Roedel
25
23.81%
1
25.00%
Yu Zhang
2
1.90%
1
25.00%
Avi Kivity
1
0.95%
1
25.00%
Total
105
100.00%
4
100.00%

/*
 * Hardware doesn't save and restore XMM 0-7 without CR4.OSFXSR, but does save
 * and restore MXCSR.
 */


static size_t __fxstate_size(int nregs)
{
	return offsetof(struct fxregs_state, xmm_space[0]) + nregs * 16;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nick Desaulniers
25
100.00%
1
100.00%
Total
25
100.00%
1
100.00%



static inline size_t fxstate_size(struct x86_emulate_ctxt *ctxt)
{
	bool cr4_osfxsr;
	if (ctxt->mode == X86EMUL_MODE_PROT64)
		return __fxstate_size(16);

	cr4_osfxsr = ctxt->ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR;
	return __fxstate_size(cr4_osfxsr ? 8 : 0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nick Desaulniers
54
100.00%
1
100.00%
Total
54
100.00%
1
100.00%

/*
 * FXSAVE and FXRSTOR have 4 different formats depending on execution mode,
 *  1) 16 bit mode
 *  2) 32 bit mode
 *     - like (1), but FIP and FDP (foo) are only 16 bit.  At least Intel CPUs
 *       preserve whole 32 bit values, though, so (1) and (2) are the same wrt.
 *       save and restore
 *  3) 64-bit mode with REX.W prefix
 *     - like (2), but XMM 8-15 are being saved and restored
 *  4) 64-bit mode without REX.W prefix
 *     - like (3), but FIP and FDP are 64 bit
 *
 * Emulation uses (3) for (1) and (2) and preserves XMM 8-15 to reach the
 * desired result.  (4) is not emulated.
 *
 * Note: Guest and host CPUID.(EAX=07H,ECX=0H):EBX[bit 13] (deprecate FPU CS
 * and FPU DS) should match.
 */


static int em_fxsave(struct x86_emulate_ctxt *ctxt)
{
	struct fxregs_state fx_state;
	int rc;

	rc = check_fxsr(ctxt);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	ctxt->ops->get_fpu(ctxt);

	rc = asm_safe("fxsave %[fx]", , [fx] "+m"(fx_state));

	ctxt->ops->put_fpu(ctxt);

	if (rc != X86EMUL_CONTINUE)
		return rc;

	return segmented_write_std(ctxt, ctxt->memop.addr.mem, &fx_state,
		                   fxstate_size(ctxt));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Radim Krčmář
81
82.65%
1
20.00%
Joerg Roedel
11
11.22%
1
20.00%
Nick Desaulniers
4
4.08%
1
20.00%
Avi Kivity
1
1.02%
1
20.00%
Steve Rutherford
1
1.02%
1
20.00%
Total
98
100.00%
5
100.00%



static int em_fxrstor(struct x86_emulate_ctxt *ctxt)
{
	struct fxregs_state fx_state;
	int rc;
	size_t size;

	rc = check_fxsr(ctxt);
	if (rc != X86EMUL_CONTINUE)
		return rc;

	ctxt->ops->get_fpu(ctxt);

	size = fxstate_size(ctxt);
	if (size < __fxstate_size(16)) {
		rc = asm_safe("fxsave %[fx]", , [fx] "+m"(fx_state));
		if (rc != X86EMUL_CONTINUE)
			goto out;
	}

	rc = segmented_read_std(ctxt, ctxt->memop.addr.mem, &fx_state, size);
	if (rc != X86EMUL_CONTINUE)
		goto out;

	if (fx_state.mxcsr >> 16) {
		rc = emulate_gp(ctxt, 0);
		goto out;
	}

	if (rc == X86EMUL_CONTINUE)
		rc = asm_safe("fxrstor %[fx]", : [fx] "m"(fx_state));

out:
	ctxt->ops->put_fpu(ctxt);

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Radim Krčmář
122
70.11%
1
33.33%
Nick Desaulniers
51
29.31%
1
33.33%
Steve Rutherford
1
0.57%
1
33.33%
Total
174
100.00%
3
100.00%



static bool valid_cr(int nr)
{
	switch (nr) {
	case 0:
	case 2 ... 4:
	case 8:
		return true;
	default:
		return false;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
33
100.00%
1
100.00%
Total
33
100.00%
1
100.00%



static int check_cr_read(struct x86_emulate_ctxt *ctxt)
{
	if (!valid_cr(ctxt->modrm_reg))
		return emulate_ud(ctxt);

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
29
96.67%
1
50.00%
Avi Kivity
1
3.33%
1
50.00%
Total
30
100.00%
2
100.00%



static int check_cr_write(struct x86_emulate_ctxt *ctxt)
{
	u64 new_val = ctxt->src.val64;
	int cr = ctxt->modrm_reg;
	u64 efer = 0;

	static u64 cr_reserved_bits[] = {
		0xffffffff00000000ULL,
		0, 0, 0, /* CR3 checked later */
		CR4_RESERVED_BITS,
		0, 0, 0,
		CR8_RESERVED_BITS,
        };

	if (!valid_cr(cr))
		return emulate_ud(ctxt);

	if (new_val & cr_reserved_bits[cr])
		return emulate_gp(ctxt, 0);

	switch (cr) {
	case 0: {
		u64 cr4;
		if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) ||
		    ((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD)))
			return emulate_gp(ctxt, 0);

		cr4 = ctxt->ops->get_cr(ctxt, 4);
		ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);

		if ((new_val & X86_CR0_PG) && (efer & EFER_LME) &&
		    !(cr4 & X86_CR4_PAE))
			return emulate_gp(ctxt, 0);

		break;
		}
	case 3: {
		u64 rsvd = 0;

		ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
		if (efer & EFER_LMA) {
			u64 maxphyaddr;
			u32 eax, ebx, ecx, edx;

			eax = 0x80000008;
			ecx = 0;
			if (ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx,
						 &edx, false))
				maxphyaddr = eax & 0xff;
			else
				maxphyaddr = 36;
			rsvd = rsvd_bits(maxphyaddr, 62);
		}

		if (new_val & rsvd)
			return emulate_gp(ctxt, 0);

		break;
		}
	case 4: {
		ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);

		if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE))
			return emulate_gp(ctxt, 0);

		break;
		}
	}

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
268
74.86%
1
14.29%
Yu Zhang
64
17.88%
2
28.57%
Avi Kivity
25
6.98%
3
42.86%
Nadav Amit
1
0.28%
1
14.29%
Total
358
100.00%
7
100.00%



static int check_dr7_gd(struct x86_emulate_ctxt *ctxt)
{
	unsigned long dr7;

	ctxt->ops->get_dr(ctxt, 7, &dr7);

	/* Check if DR7.Global_Enable is set */
	return dr7 & (1 << 13);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
37
94.87%
1
50.00%
Avi Kivity
2
5.13%
1
50.00%
Total
39
100.00%
2
100.00%



static int check_dr_read(struct x86_emulate_ctxt *ctxt)
{
	int dr = ctxt->modrm_reg;
	u64 cr4;

	if (dr > 7)
		return emulate_ud(ctxt);

	cr4 = ctxt->ops->get_cr(ctxt, 4);
	if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5))
		return emulate_ud(ctxt);

	if (check_dr7_gd(ctxt)) {
		ulong dr6;

		ctxt->ops->get_dr(ctxt, 6, &dr6);
		dr6 &= ~15;
		dr6 |= DR6_BD | DR6_RTM;
		ctxt->ops->set_dr(ctxt, 6, dr6);
		return emulate_db(ctxt);
	}

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
83
64.34%
1
25.00%
Nadav Amit
43
33.33%
1
25.00%
Avi Kivity
3
2.33%
2
50.00%
Total
129
100.00%
4
100.00%



static int check_dr_write(struct x86_emulate_ctxt *ctxt)
{
	u64 new_val = ctxt->src.val64;
	int dr = ctxt->modrm_reg;

	if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL))
		return emulate_gp(ctxt, 0);

	return check_dr_read(ctxt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
57
96.61%
1
50.00%
Avi Kivity
2
3.39%
1
50.00%
Total
59
100.00%
2
100.00%



static int check_svme(struct x86_emulate_ctxt *ctxt)
{
	u64 efer = 0;

	ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);

	if (!(efer & EFER_SVME))
		return emulate_ud(ctxt);

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
46
95.83%
1
50.00%
Radim Krčmář
2
4.17%
1
50.00%
Total
48
100.00%
2
100.00%



static int check_svme_pa(struct x86_emulate_ctxt *ctxt)
{
	u64 rax = reg_read(ctxt, VCPU_REGS_RAX);

	/* Valid physical address? */
	if (rax & 0xffff000000000000ULL)
		return emulate_gp(ctxt, 0);

	return check_svme(ctxt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
37
88.10%
1
33.33%
Avi Kivity
4
9.52%
1
33.33%
Randy Dunlap
1
2.38%
1
33.33%
Total
42
100.00%
3
100.00%



static int check_rdtsc(struct x86_emulate_ctxt *ctxt)
{
	u64 cr4 = ctxt->ops->get_cr(ctxt, 4);

	if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt))
		return emulate_ud(ctxt);

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
47
95.92%
1
50.00%
Avi Kivity
2
4.08%
1
50.00%
Total
49
100.00%
2
100.00%



static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
{
	u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
	u64 rcx = reg_read(ctxt, VCPU_REGS_RCX);

	if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) ||
	    ctxt->ops->check_pmc(ctxt, rcx))
		return emulate_gp(ctxt, 0);

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
62
80.52%
1
25.00%
Nadav Amit
9
11.69%
1
25.00%
Avi Kivity
6
7.79%
2
50.00%
Total
77
100.00%
4
100.00%



static int check_perm_in(struct x86_emulate_ctxt *ctxt)
{
	ctxt->dst.bytes = min(ctxt->dst.bytes, 4u);
	if (!emulator_io_permited(ctxt, ctxt->src.val, ctxt->dst.bytes))
		return emulate_gp(ctxt, 0);

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
56
94.92%
1
50.00%
Avi Kivity
3
5.08%
1
50.00%
Total
59
100.00%
2
100.00%



static int check_perm_out(struct x86_emulate_ctxt *ctxt)
{
	ctxt->src.bytes = min(ctxt->src.bytes, 4u);
	if (!emulator_io_permited(ctxt, ctxt->dst.val, ctxt->src.bytes))
		return emulate_gp(ctxt, 0);

	return X86EMUL_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joerg Roedel
56
94.92%
1
50.00%
Avi Kivity
3
5.08%
1
50.00%
Total
59
100.00%
2
100.00%


#define D(_y) { .flags = (_y) }

#define DI(_y, _i) { .flags = (_y)|Intercept, .intercept = x86_intercept_##_i }

#define DIP(_y, _i, _p) { .flags = (_y)|Intercept|CheckPerm, \
                      .intercept = x86_intercept_##_i, .check_perm = (_p) }

#define N    D(NotImpl)

#define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) }

#define G(_f, _g) { .flags = ((_f) | Group | ModRM), .u.group = (_g) }

#define GD(_f, _g) { .flags = ((_f) | GroupDual | ModRM), .u.gdual = (_g) }

#define ID(_f, _i) { .flags = ((_f) | InstrDual | ModRM), .u.idual = (_i) }

#define MD(_f, _m) { .flags = ((_f) | ModeDual), .u.mdual = (_m) }

#define E(_f, _e) { .flags = ((_f) | Escape | ModRM), .u.esc = (_e) }

#define I(_f, _e) { .flags = (_f), .u.execute = (_e) }

#define F(_f, _e) { .flags = (_f) | Fastop, .u.fastop = (_e) }

#define II(_f, _e, _i) \
	{ .flags = (_f)|Intercept, .u.execute = (_e), .intercept = x86_intercept_##_i }

#define IIP(_f, _e, _i, _p) \
	{ .flags = (_f)|Intercept|CheckPerm, .u.execute = (_e), \
          .intercept = x86_intercept_##_i, .check_perm = (_p) }

#define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) }


#define D2bv(_f)      D((_f) | ByteOp), D(_f)

#define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p)

#define I2bv(_f, _e)  I((_f) | ByteOp, _e), I(_f, _e)

#define F2bv(_f, _e)  F((_f) | ByteOp, _e), F(_f, _e)

#define I2bvIP(_f, _e, _i, _p) \
	IIP((_f) | ByteOp, _e, _i, _p), IIP(_f, _e, _i, _p)


#define F6ALU(_f, _e) F2bv((_f) | DstMem | SrcReg | ModRM, _e),               \
                F2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e),     \
                F2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e)


static const struct opcode group7_rm0[] = {
	N,
	I(SrcNone | Priv | EmulateOnUD,	em_hypercall),
	N, N, N, N, N, N,
};


static const struct opcode group7_rm1[] = {
	DI(SrcNone | Priv, monitor),
	DI(SrcNone | Priv, mwait),
	N, N, N, N, N, N,
};


static const struct opcode group7_rm3[] = {
	DIP(SrcNone | Prot | Priv,		vmrun,		check_svme_pa),
	II(SrcNone  | Prot | EmulateOnUD,	em_hypercall,	vmmcall),
	DIP(SrcNone | Prot | Priv,		vmload,		check_svme_pa),
	DIP(SrcNone | Prot | Priv,		vmsave,		check_svme_pa),
	DIP(SrcNone | Prot | Priv,		stgi,		check_svme),
	DIP(SrcNone | Prot | Priv,		clgi,		check_svme),
	DIP(SrcNone | Prot | Priv,		skinit,		check_svme),
	DIP(SrcNone | Prot | Priv,		invlpga,	check_svme),
};


static const struct opcode group7_rm7[] = {
	N,
	DIP(SrcNone, rdtscp, check_rdtsc),
	N, N, N, N, N, N,
};


static const struct opcode group1[] = {
	F(Lock, em_add),
	F(Lock | PageTable, em_or),
	F(Lock, em_adc),
	F(Lock, em_sbb),
	F(Lock | PageTable, em_and),
	F(Lock, em_sub),
	F(Lock, em_xor),
	F(NoWrite, em_cmp),
};


static const struct opcode group1A[] = {
	I(DstMem | SrcNone | Mov | Stack | IncSP | TwoMemOp, em_pop), N, N, N, N, N, N, N,
};


static const struct opcode group2[] = {
	F(DstMem | ModRM, em_rol),
	F(DstMem | ModRM, em_ror),
	F(DstMem | ModRM, em_rcl),
	F(DstMem | ModRM, em_rcr),
	F(DstMem | ModRM, em_shl),
	F(DstMem | ModRM, em_shr),
	F(DstMem | ModRM, em_shl),
	F(DstMem | ModRM, em_sar),
};


static const struct opcode group3[] = {
	F(DstMem | SrcImm | NoWrite, em_test),
	F(DstMem | SrcImm | NoWrite, em_test),
	F(DstMem | SrcNone | Lock, em_not),
	F(DstMem | SrcNone | Lock, em_neg),
	F(DstXacc | Src2Mem, em_mul_ex),
	F(DstXacc | Src2Mem, em_imul_ex),
	F(DstXacc | Src2Mem, em_div_ex),
	F(DstXacc | Src2Mem, em_idiv_ex),
};


static const struct opcode group4[] = {
	F(ByteOp | DstMem | SrcNone | Lock, em_inc),
	F(ByteOp | DstMem | SrcNone | Lock, em_dec),
	N, N, N, N, N, N,
};


static const struct opcode group5[] = {
	F(DstMem | SrcNone | Lock,		em_inc),
	F(DstMem | SrcNone | Lock,		em_dec),
	I(SrcMem | NearBranch,			em_call_near_abs),
	I(SrcMemFAddr | ImplicitOps,		em_call_far),
	I(SrcMem | NearBranch,			em_jmp_abs),
	I(SrcMemFAddr | ImplicitOps,		em_jmp_far),
	I(SrcMem | Stack | TwoMemOp,		em_push), D(Undefined),
};


static const struct opcode group6[] = {
	DI(Prot | DstMem,	sldt),
	DI(Prot | DstMem,	str),
	II(Prot | Priv | SrcMem16, em_lldt, lldt),
	II(Prot | Priv | SrcMem16, em_ltr, ltr),
	N, N, N, N,
};


static const struct group_dual group7 = { {
	II(Mov | DstMem,			em_sgdt, sgdt),
	II(Mov | DstMem,			em_sidt, sidt),
	II(SrcMem | Priv,			em_lgdt, lgdt),
	II(SrcMem | Priv,			em_lidt, lidt),
	II(SrcNone | DstMem | Mov,		em_smsw, smsw), N,
	II(SrcMem16 | Mov | Priv,		em_lmsw, lmsw),
	II(SrcMem | ByteOp | Priv | NoAccess,	em_invlpg, invlpg),
}, {
	EXT(0, group7_rm0),
	EXT(0, group7_rm1),
	N, EXT(0, group7_rm3),
	II(SrcNone | DstMem | Mov,		em_smsw, smsw), N,
	II(SrcMem16 | Mov | Priv,		em_lmsw, lmsw),
	EXT(0, group7_rm7),
} };


static const struct opcode group8[] = {
	N, N, N, N,
	F(DstMem | SrcImmByte | NoWrite,		em_bt),
	F(DstMem | SrcImmByte | Lock | PageTable,	em_bts),
	F(DstMem | SrcImmByte | Lock,			em_btr),
	F(DstMem | SrcImmByte | Lock | PageTable,	em_btc),
};


static const struct group_dual group9 = { {
	N, I(DstMem64 | Lock | PageTable, em_cmpxchg8b), N, N, N, N, N, N,
}, {
	N, N, N, N, N, N, N, N,
} };


static const struct opcode group11[] = {
	I(DstMem | SrcImm | Mov | PageTable, em_mov),
	X7(D(Undefined)),
};


static const struct gprefix pfx_0f_ae_7 = {
	I(SrcMem | ByteOp, em_clflush), N, N, N,
};


static const struct group_dual group15 = { {
	I(ModRM | Aligned16, em_fxsave),
	I(ModRM | Aligned16, em_fxrstor),
	N, N, N, N, N, GP(0, &pfx_0f_ae_7),
}, {
	N, N, N, N, N, N, N, N,
} };


static const struct gprefix pfx_0f_6f_0f_7f = {
	I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov),
};


static const struct instr_dual instr_dual_0f_2b = {
	I(0, em_mov), N
};


static const struct gprefix pfx_0f_2b = {
	ID(0, &instr_dual_0f_2b), ID(0, &instr_dual_0f_2b), N, N,
};


static const struct gprefix pfx_0f_28_0f_29 = {
	I(Aligned, em_mov), I(Aligned, em_mov), N, N,
};


static const struct gprefix pfx_0f_e7 = {
	N, I(Sse, em_mov), N, N,
};


static const struct escape escape_d9 = { {
	N, N, N, N, N, N, N, I(DstMem16 | Mov, em_fnstcw),
}, {
	/* 0xC0 - 0xC7 */
	N, N, N, N, N, N, N, N,
	/* 0xC8 - 0xCF */
	N, N, N, N, N, N, N, N,
	/* 0xD0 - 0xC7 */
	N, N, N, N, N, N, N, N,
	/* 0xD8 - 0xDF */
	N, N, N, N, N, N, N, N,
	/* 0xE0 - 0xE7 */
	N, N, N, N, N, N, N, N,
	/* 0xE8 - 0xEF */
	N, N, N, N, N, N, N, N,
	/* 0xF0 - 0xF7 */
	N, N, N, N, N, N, N, N,
	/* 0xF8 - 0xFF */
	N, N, N, N, N, N, N, N,
} };


static const struct escape escape_db = { {
	N, N, N, N, N, N, N, N,
}, {
	/* 0xC0 - 0xC7 */
	N, N, N, N, N, N, N, N,
	/* 0xC8 - 0xCF */
	N, N, N, N, N, N, N, N,
	/* 0xD0 - 0xC7 */
	N, N, N, N, N, N, N, N,
	/* 0xD8 - 0xDF */
	N, N, N, N, N, N, N, N,
	/* 0xE0 - 0xE7 */
	N, N, N, I(ImplicitOps, em_fninit), N, N, N, N,
	/* 0xE8 - 0xEF */
	N, N, N, N, N, N, N, N,
	/* 0xF0 - 0xF7 */
	N, N, N, N, N, N, N, N,
	/* 0xF8 - 0xFF */
	N, N, N, N, N, N, N, N,
} };


static const struct escape escape_dd = { {
	N, N, N, N, N, N, N, I(DstMem16 | Mov, em_fnstsw),
}, {
	/* 0xC0 - 0xC7 */
	N, N, N, N, N, N, N, N,
	/* 0xC8 - 0xCF */
	N, N, N, N, N, N, N, N,
	/* 0xD0 - 0xC7 */
	N, N, N, N, N, N, N, N,
	/* 0xD8 - 0xDF */
	N, N, N, N, N, N, N, N,
	/* 0xE0 - 0xE7 */
	N, N, N, N, N, N, N, N,
	/* 0xE8 - 0xEF */
	N, N, N, N, N, N, N, N,
	/* 0xF0 - 0xF7 */
	N, N, N, N, N, N, N, N,
	/* 0xF8 - 0xFF */
	N, N, N, N, N, N, N, N,
} };


static const struct instr_dual instr_dual_0f_c3 = {
	I(DstMem | SrcReg | ModRM | No16 | Mov, em_mov), N
};


static const struct mode_dual mode_dual_63 = {
	N, I(DstReg | SrcMem32 | ModRM | Mov, em_movsxd)
};


static const struct opcode opcode_table[256] = {
	/* 0x00 - 0x07 */
	F6ALU(Lock, em_add),
	I(ImplicitOps | Stack | No64 | Src2ES, em_push_sreg),
	I(ImplicitOps | Stack | No64 | Src2ES, em_pop_sreg),
	/* 0x08 - 0x0F */
	F6ALU(Lock | PageTable, em_or),
	I(ImplicitOps | Stack | No64 | Src2CS, em_push_sreg),
	N,
	/* 0x10 - 0x17 */
	F6ALU(Lock, em_adc),
	I(ImplicitOps | Stack | No64 | Src2SS, em_push_sreg),
	I(ImplicitOps | Stack | No64 | Src2SS, em_pop_sreg),
	/* 0x18 - 0x1F */
	F6ALU(Lock, em_sbb),
	I(ImplicitOps | Stack | No64 | Src2DS, em_push_sreg),
	I(ImplicitOps | Stack | No64 | Src2DS, em_pop_sreg),
	/* 0x20 - 0x27 */
	F6ALU(Lock | PageTable, em_and), N, N,
	/* 0x28 - 0x2F */
	F6ALU(Lock, em_sub), N, I(ByteOp | DstAcc | No64, em_das),
	/* 0x30 - 0x37 */
	F6ALU(Lock, em_xor), N, N,
	/* 0x38 - 0x3F */
	F6ALU(NoWrite, em_cmp), N, N,
	/* 0x40 - 0x4F */
	X8(F(DstReg, em_inc)), X8(F(DstReg, em_dec)),
	/* 0x50 - 0x57 */
	X8(I(SrcReg | Stack, em_push)),
	/* 0x58 - 0x5F */
	X8(I(DstReg | Stack, em_pop)),
	/* 0x60 - 0x67 */
	I(ImplicitOps | Stack | No64, em_pusha),
	I(ImplicitOps | Stack | No64, em_popa),
	N, MD(ModRM, &mode_dual_63),
	N, N, N, N,
	/* 0x68 - 0x6F */
	I(SrcImm | Mov | Stack, em_push),
	I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op),
	I(SrcImmByte | Mov | Stack, em_push),
	I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op),
	I2bvIP(DstDI | SrcDX | Mov | String | Unaligned, em_in, ins, check_perm_in), /* insb, insw/insd */
	I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */
	/* 0x70 - 0x7F */
	X16(D(SrcImmByte | NearBranch)),
	/* 0x80 - 0x87 */
	G(ByteOp | DstMem | SrcImm, group1),
	G(DstMem | SrcImm, group1),
	G(ByteOp | DstMem | SrcImm | No64, group1),
	G(DstMem | SrcImmByte, group1),
	F2bv(DstMem | SrcReg | ModRM | NoWrite, em_test),
	I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_xchg),
	/* 0x88 - 0x8F */
	I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov),
	I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
	I(DstMem | SrcNone | ModRM | Mov | PageTable, em_mov_rm_sreg),
	D(ModRM | SrcMem | NoAccess | DstReg),
	I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm),
	G(0, group1A),
	/* 0x90 - 0x97 */
	DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)),
	/* 0x98 - 0x9F */
	D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),
	I(SrcImmFAddr | No64, em_call_far), N,
	II(ImplicitOps | Stack, em_pushf, pushf),
	II(ImplicitOps | Stack, em_popf, popf),
	I(ImplicitOps, em_sahf), I(ImplicitOps, em_lahf),
	/* 0xA0 - 0xA7 */
	I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
	I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov),
	I2bv(SrcSI | DstDI | Mov | String | TwoMemOp, em_mov),
	F2bv(SrcSI | DstDI | String | NoWrite | TwoMemOp, em_cmp_r),
	/* 0xA8 - 0xAF */
	F2bv(DstAcc | SrcImm | NoWrite, em_test),
	I2bv(SrcAcc | DstDI | Mov | String, em_mov),
	I2bv(SrcSI | DstAcc | Mov | String, em_mov),
	F2bv(SrcAcc | DstDI | String | NoWrite, em_cmp_r),
	/* 0xB0 - 0xB7 */
	X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
	/* 0xB8 - 0xBF */
	X8(I(DstReg | SrcImm64 | Mov, em_mov)),
	/* 0xC0 - 0xC7 */
	G(ByteOp | Src2ImmByte, group2), G(Src2ImmByte, group2),
	I(ImplicitOps | NearBranch | SrcImmU16, em_ret_near_imm),
	I(ImplicitOps | NearBranch, em_ret),
	I(DstReg | SrcMemFAddr | ModRM | No64 | Src2ES, em_lseg),
	I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg),
	G(ByteOp, group11), G(0, group11),
	/* 0xC8 - 0xCF */
	I(Stack | SrcImmU16 | Src2ImmByte, em_enter), I(Stack, em_leave),
	I(ImplicitOps | SrcImmU16, em_ret_far_imm),
	I(ImplicitOps, em_ret_far),
	D(ImplicitOps), DI(SrcImmByte, intn),
	D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret),
	/* 0xD0 - 0xD7 */
	G(Src2One | ByteOp, group2), G(Src2One, group2),
	G(Src2CL | ByteOp, group2), G(Src2CL, group2),
	I(DstAcc | SrcImmUByte | No64, em_aam),
	I(DstAcc | SrcImmUByte | No64, em_aad),
	F(DstAcc | ByteOp | No64, em_salc),
	I(DstAcc | SrcXLat | ByteOp, em_mov),
	/* 0xD8 - 0xDF */
	N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N,
	/* 0xE0 - 0xE7 */
	X3(I(SrcImmByte | NearBranch, em_loop)),
	I(SrcImmByte | NearBranch, em_jcxz),
	I2bvIP(SrcImmUByte | DstAcc, em_in,  in,  check_perm_in),
	I2bvIP(SrcAcc | DstImmUByte, em_out, out, check_perm_out),
	/* 0xE8 - 0xEF */
	I(SrcImm | NearBranch, em_call), D(SrcImm | ImplicitOps | NearBranch),
	I(SrcImmFAddr | No64, em_jmp_far),
	D(SrcImmByte | ImplicitOps | NearBranch),
	I2bvIP(SrcDX | DstAcc, em_in,  in,  check_perm_in),
	I2bvIP(SrcAcc | DstDX, em_out, out, check_perm_out),
	/* 0xF0 - 0xF7 */
	N, DI(ImplicitOps, icebp), N, N,
	DI(ImplicitOps | Priv, hlt), D(ImplicitOps),
	G(ByteOp, group3), G(0, group3),
	/* 0xF8 - 0xFF */
	D(ImplicitOps), D(ImplicitOps),
	I(ImplicitOps, em_cli), I(ImplicitOps, em_sti),
	D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5),
};


static const struct opcode twobyte_table[256] = {
	/* 0x00 - 0x0F */
	G(0, group6), GD(0, &group7), N, N,
	N, I(ImplicitOps | EmulateOnUD, em_syscall),
	II(ImplicitOps | Priv, em_clts, clts), N,
	DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N,
	N, D(ImplicitOps | ModRM | SrcMem | NoAccess), N, N,
	/* 0x10 - 0x1F */
	N, N, N, N, N, N, N, N,
	D(ImplicitOps | ModRM | SrcMem | NoAccess),
	N, N, N, N, N, N, D(ImplicitOps | ModRM | SrcMem | NoAccess),
	/* 0x20 - 0x2F */
	DIP(ModRM | DstMem | Priv | Op3264 | NoMod, cr_read, check_cr_read),
	DIP(ModRM | DstMem | Priv | Op3264 | NoMod, dr_read, check_dr_read),
	IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_cr_write, cr_write,
						check_cr_write),
	IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_dr_write, dr_write,
						check_dr_write),
	N, N, N, N,
	GP(ModRM | DstReg | SrcMem | Mov | Sse, &pfx_0f_28_0f_29),
	GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_28_0f_29),
	N, GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_2b),
	N, N, N, N,
	/* 0x30 - 0x3F */
	II(ImplicitOps | Priv, em_wrmsr, wrmsr),
	IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
	II(ImplicitOps | Priv, em_rdmsr, rdmsr),
	IIP(ImplicitOps, em_rdpmc, rdpmc, check_rdpmc),
	I(ImplicitOps | EmulateOnUD, em_sysenter),
	I(ImplicitOps | Priv | EmulateOnUD, em_sysexit),
	N, N,
	N, N, N, N, N, N, N, N,
	/* 0x40 - 0x4F */
	X16(D(DstReg | SrcMem | ModRM)),
	/* 0x50 - 0x5F */
	N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
	/* 0x60 - 0x6F */
	N, N, N, N,
	N, N, N, N,
	N, N, N, N,
	N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f),
	/* 0x70 - 0x7F */
	N, N, N, N,
	N, N, N, N,
	N, N, N, N,
	N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f),
	/* 0x80 - 0x8F */
	X16(D(SrcImm | NearBranch)),
	/* 0x90 - 0x9F */
	X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
	/* 0xA0 - 0xA7 */
	I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg),
	II(ImplicitOps, em_cpuid, cpuid),
	F(DstMem | SrcReg | ModRM | BitOp | NoWrite, em_bt),
	F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shld),
	F(DstMem | SrcReg | Src2CL | ModRM, em_shld), N, N,
	/* 0xA8 - 0xAF */
	I(Stack | Src2GS, em_push_sreg), I(Stack | Src2GS, em_pop_sreg),
	II(EmulateOnUD | ImplicitOps, em_rsm, rsm),
	F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_bts),
	F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shrd),
	F(DstMem | SrcReg | Src2CL | ModRM, em_shrd),
	GD(0, &group15), F(DstReg | SrcMem | ModRM, em_imul),
	/* 0xB0 - 0xB7 */
	I2bv(DstMem | SrcReg | ModRM | Lock | PageTable | SrcWrite, em_cmpxchg),
	I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg),
	F(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr),
	I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg),
	I(DstReg | SrcMemFAddr | ModRM | Src2GS, em_lseg),
	D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
	/* 0xB8 - 0xBF */
	N, N,
	G(BitOp, group8),
	F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc),
	I(DstReg | SrcMem | ModRM, em_bsf_c),
	I(DstReg | SrcMem | ModRM, em_bsr_c),
	D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
	/* 0xC0 - 0xC7 */
	F2bv(DstMem | SrcReg | ModRM | SrcWrite | Lock, em_xadd),
	N, ID(0, &instr_dual_0f_c3),
	N, N, N, GD(0, &group9),
	/* 0xC8 - 0xCF */
	X8(I(DstReg, em_bswap)),
	/* 0xD0 - 0xDF */
	N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
	/* 0xE0 - 0xEF */
	N, N, N, N, N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_e7),
	N, N, N, N, N, N, N, N,
	/* 0xF0 - 0xFF */
	N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N
};


static const struct instr_dual instr_dual_0f_38_f0 = {
	I(DstReg | SrcMem | Mov, em_movbe), N
};


static const struct instr_dual instr_dual_0f_38_f1 = {
	I(DstMem | SrcReg | Mov, em_movbe), N
};


static const struct gprefix three_byte_0f_38_f0 = {
	ID(0, &instr_dual_0f_38_f0), N, N, N
};


static const struct gprefix three_byte_0f_38_f1 = {
	ID(0, &instr_dual_0f_38_f1), N, N, N
};

/*
 * Insns below are selected by the prefix which indexed by the third opcode
 * byte.
 */

static const struct opcode opcode_map_0f_38[256] = {
	/* 0x00 - 0x7f */
	X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N),
	/* 0x80 - 0xef */
	X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N),
	/* 0xf0 - 0xf1 */
	GP(EmulateOnUD | ModRM, &three_byte_0f_38_f0),
	GP(EmulateOnUD | ModRM, &three_byte_0f_38_f1),
	/* 0xf2 - 0xff */
	N, N, X4(N), X8(N)
};


#undef D

#undef N

#undef G

#undef GD

#undef I

#undef GP

#undef EXT

#undef MD

#undef ID


#undef D2bv

#undef D2bvIP

#undef I2bv

#undef I2bvIP

#undef I6ALU



static unsigned imm_size(struct x86_emulate_ctxt *ctxt)
{
	unsigned size;

	size = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
	if (size == 8)
		size = 4;
	return size;
}

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static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op,
		      unsigned size, bool sign_extension)
{
	int rc = X86EMUL_CONTINUE;

	op->type = OP_IMM;
	op->bytes = size;
	op->addr.mem.ea = ctxt->_eip;
	/* NB. Immediates are sign-extended as necessary. */
	switch (op->bytes) {
	case 1:
		op->val = insn_fetch(s8, ctxt);
		break;
	case 2:
		op->val = insn_fetch(s16, ctxt);
		break;
	case 4:
		op->val = insn_fetch(s32, ctxt);
		break;
	case 8:
		op->val = insn_fetch(s64, ctxt);
		break;
	}
	if (!sign_extension) {
		switch (op->bytes) {
		case 1:
			op->val &= 0xff;
			break;
		case 2:
			op->val &= 0xffff;
			break;
		case 4:
			op->val &= 0xffffffff;
			break;
		}
	}
done:
	return rc;
}

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static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
			  unsigned d)
{
	int rc = X86EMUL_CONTINUE;

	switch (d) {
	case OpReg:
		decode_register_operand(ctxt, op);
		break;
	case OpImmUByte:
		rc = decode_imm(ctxt, op, 1, false);
		break;
	case OpMem:
		ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
	mem_common:
		*op = ctxt->memop;
		ctxt->memopp = op;
		if (ctxt->d & BitOp)
			fetch_bit_operand(ctxt);
		op->orig_val = op->val;
		break;
	case OpMem64:
		ctxt->memop.bytes = (ctxt->op_bytes == 8) ? 16 : 8;
		goto mem_common;
	case OpAcc:
		op->type = OP_REG;
		op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
		op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
		fetch_register_operand(op);
		op->orig_val = op->val;
		break;
	case OpAccLo:
		op->type = OP_REG;
		op->bytes = (ctxt->d & ByteOp) ? 2 : ctxt->op_bytes;
		op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
		fetch_register_operand(op);
		op->orig_val = op->val;
		break;
	case OpAccHi:
		if (ctxt->d & ByteOp) {
			op->type = OP_NONE;
			break;
		}
		op->type = OP_REG;
		op->bytes = ctxt->op_bytes;
		op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
		fetch_register_operand(op);
		op->orig_val = op->val;
		break;
	case OpDI:
		op->type = OP_MEM;
		op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
		op->addr.mem.ea =
			register_address(ctxt, VCPU_REGS_RDI);
		op->addr.mem.seg = VCPU_SREG_ES;
		op->val = 0;
		op->count = 1;
		break;
	case OpDX:
		op->type = OP_REG;
		op->bytes = 2;
		op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
		fetch_register_operand(op);
		break;
	case OpCL:
		op->type = OP_IMM;
		op->bytes = 1;
		op->val = reg_read(ctxt, VCPU_REGS_RCX) & 0xff;
		break;
	case OpImmByte:
		rc = decode_imm(ctxt, op, 1, true);
		break;
	case OpOne:
		op->type = OP_IMM;
		op->bytes = 1;
		op->val = 1;
		break;
	case OpImm:
		rc = decode_imm(ctxt, op, imm_size(ctxt), true);
		break;
	case OpImm64:
		rc = decode_imm(ctxt, op, ctxt->op_bytes, true);
		break;
	case OpMem8:
		ctxt->memop.bytes = 1;
		if (ctxt->memop.type == OP_REG) {
			ctxt->memop.addr.reg = decode_register(ctxt,
					ctxt->modrm_rm, true);
			fetch_register_operand(&ctxt->memop);
		}
		goto mem_common;
	case OpMem16:
		ctxt->memop.bytes = 2;
		goto mem_common;
	case OpMem32:
		ctxt->memop.bytes = 4;
		goto mem_common;
	case OpImmU16:
		rc = decode_imm(ctxt, op, 2, false);
		break;
	case OpImmU:
		rc = decode_imm(ctxt, op, imm_size(ctxt), false);
		break;
	case OpSI:
		op->type = OP_MEM;
		op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
		op->addr.mem.ea =
			register_address(ctxt, VCPU_REGS_RSI);
		op->addr.mem.seg = ctxt->seg_override;
		op->val = 0;
		op->count = 1;
		break;
	case OpXLat:
		op->type = OP_MEM;
		op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
		op->addr.mem.ea =
			address_mask(ctxt,
				reg_read(ctxt, VCPU_REGS_RBX) +
				(reg_read(ctxt, VCPU_REGS_RAX) & 0xff));
		op->addr.mem.seg = ctxt->seg_override;
		op->val = 0;
		break;
	case OpImmFAddr:
		op->type = OP_IMM;
		op->addr.mem.ea = ctxt->_eip;
		op->bytes = ctxt->op_bytes + 2;
		insn_fetch_arr(op->valptr, op->bytes, ctxt);
		break;
	case OpMemFAddr:
		ctxt->memop.bytes = ctxt->op_bytes + 2;
		goto mem_common;
	case OpES:
		op->type = OP_IMM;
		op->val = VCPU_SREG_ES;
		break;
	case OpCS:
		op->type = OP_IMM;
		op->val = VCPU_SREG_CS;
		break;
	case OpSS:
		op->type = OP_IMM;
		op->val = VCPU_SREG_SS;
		break;
	case OpDS:
		op->type = OP_IMM;
		op->val = VCPU_SREG_DS;
		break;
	case OpFS:
		op->type = OP_IMM;
		op->val = VCPU_SREG_FS;
		break;
	case OpGS:
		op->type = OP_IMM;
		op->val = VCPU_SREG_GS;
		break;
	case OpImplicit:
		/* Special instructions do their own operand decoding. */
	default:
		op->type = OP_NONE; /* Disable writeback. */
		break;
	}

done:
	return rc;
}

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Avi Kivity
701
73.33%
15
48.39%
Nadav Amit
77
8.05%
3
9.68%
Paolo Bonzini
75
7.85%
2
6.45%
Gleb Natapov
69
7.22%
5
16.13%
Andre Przywara
20
2.09%
2
6.45%
Laurent Vivier
7
0.73%
1
3.23%
Bandan Das
4
0.42%
1
3.23%
Glauber de Oliveira Costa
2
0.21%
1
3.23%
Takuya Yoshikawa
1
0.10%
1
3.23%
Total
956
100.00%
31
100.00%



int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
{
	int rc = X86EMUL_CONTINUE;
	int mode = ctxt->mode;
	int def_op_bytes, def_ad_bytes, goffset, simd_prefix;
	bool op_prefix = false;
	bool has_seg_override = false;
	struct opcode opcode;

	ctxt->memop.type = OP_NONE;
	ctxt->memopp = NULL;
	ctxt->_eip = ctxt->eip;
	ctxt->fetch.ptr = ctxt->fetch.data;
	ctxt->fetch.end = ctxt->fetch.data + insn_len;
	ctxt->opcode_len = 1;
	if (insn_len > 0)
		memcpy(ctxt->fetch.data, insn, insn_len);
	else {
		rc = __do_insn_fetch_bytes(ctxt, 1);
		if (rc != X86EMUL_CONTINUE)
			return rc;
	}

	switch (mode) {
	case X86EMUL_MODE_REAL:
	case X86EMUL_MODE_VM86:
	case X86EMUL_MODE_PROT16:
		def_op_bytes = def_ad_bytes = 2;
		break;
	case X86EMUL_MODE_PROT32:
		def_op_bytes = def_ad_bytes = 4;
		break;
#ifdef CONFIG_X86_64
	case X86EMUL_MODE_PROT64:
		def_op_bytes = 4;
		def_ad_bytes = 8;
		break;
#endif
	default:
		return EMULATION_FAILED;
	}

	ctxt->op_bytes = def_op_bytes;
	ctxt->ad_bytes = def_ad_bytes;

	/* Legacy prefixes. */
	for (;;) {
		switch (ctxt->b = insn_fetch(u8, ctxt)) {
		case 0x66:	/* operand-size override */
			op_prefix = true;
			/* switch between 2/4 bytes */
			ctxt->op_bytes = def_op_bytes ^ 6;
			break;
		case 0x67:	/* address-size override */
			if (mode == X86EMUL_MODE_PROT64)
				/* switch between 4/8 bytes */
				ctxt->ad_bytes = def_ad_bytes ^ 12;
			else
				/* switch between 2/4 bytes */
				ctxt->ad_bytes = def_ad_bytes ^ 6;
			break;
		case 0x26:	/* ES override */
		case 0x2e:	/* CS override */
		case 0x36:	/* SS override */
		case 0x3e:	/* DS override */
			has_seg_override = true;
			ctxt->seg_override = (ctxt->b >> 3) & 3;
			break;
		case 0x64:	/* FS override */
		case 0x65:	/* GS override */
			has_seg_override = true;
			ctxt->seg_override = ctxt->b & 7;
			break;
		case 0x40 ... 0x4f: /* REX */
			if (mode != X86EMUL_MODE_PROT64)
				goto done_prefixes;
			ctxt->rex_prefix = ctxt->b;
			continue;
		case 0xf0:	/* LOCK */
			ctxt->lock_prefix = 1;
			break;
		case 0xf2:	/* REPNE/REPNZ */
		case 0xf3:	/* REP/REPE/REPZ */
			ctxt->rep_prefix = ctxt->b;
			break;
		default:
			goto done_prefixes;
		}

		/* Any legacy prefix after a REX prefix nullifies its effect. */

		ctxt->rex_prefix = 0;
	}

done_prefixes:

	/* REX prefix. */
	if (ctxt->rex_prefix & 8)
		ctxt->op_bytes = 8;	/* REX.W */

	/* Opcode byte(s). */
	opcode = opcode_table[ctxt->b];
	/* Two-byte opcode? */
	if (ctxt->b == 0x0f) {
		ctxt->opcode_len = 2;
		ctxt->b = insn_fetch(u8, ctxt);
		opcode = twobyte_table[ctxt->b];

		/* 0F_38 opcode map */
		if (ctxt->b == 0x38) {
			ctxt->opcode_len = 3;
			ctxt->b = insn_fetch(u8, ctxt);
			opcode = opcode_map_0f_38[ctxt->b];
		}
	}
	ctxt->d = opcode.flags;

	if (ctxt->d & ModRM)
		ctxt->modrm = insn_fetch(u8, ctxt);

	/* vex-prefix instructions are not implemented */
	if (ctxt->opcode_len == 1 && (ctxt->b == 0xc5 || ctxt->b == 0xc4) &&
	    (mode == X86EMUL_MODE_PROT64 || (ctxt->modrm & 0xc0) == 0xc0)) {
		ctxt->d = NotImpl;
	}

	while (ctxt->d & GroupMask) {
		switch (ctxt->d & GroupMask) {
		case Group:
			goffset = (ctxt->modrm >> 3) & 7;
			opcode = opcode.u.group[goffset];
			break;
		case GroupDual:
			goffset = (ctxt->modrm >> 3) & 7;
			if ((ctxt->modrm >> 6) == 3)
				opcode = opcode.u.gdual->mod3[goffset];
			else
				opcode = opcode.u.gdual->mod012[goffset];
			break;
		case RMExt:
			goffset = ctxt->modrm & 7;
			opcode = opcode.u.group[goffset];
			break;
		case Prefix:
			if (ctxt->rep_prefix && op_prefix)
				return EMULATION_FAILED;
			simd_prefix = op_prefix ? 0x66 : ctxt->rep_prefix;
			switch (simd_prefix) {
			case 0x00: opcode = opcode.u.gprefix->pfx_no; break;
			case 0x66: opcode = opcode.u.gprefix->pfx_66; break;
			case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break;
			case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break;
			}
			break;
		case Escape:
			if (ctxt->modrm > 0xbf)
				opcode = opcode.u.esc->high[ctxt->modrm - 0xc0];
			else
				opcode = opcode.u.esc->op[(ctxt->modrm >> 3) & 7];
			break;
		case InstrDual:
			if ((ctxt->modrm >> 6) == 3)
				opcode = opcode.u.idual->mod3;
			else
				opcode = opcode.u.idual->mod012;
			break;
		case ModeDual:
			if (ctxt->mode == X86EMUL_MODE_PROT64)
				opcode = opcode.u.mdual->mode64;
			else
				opcode = opcode.u.mdual->mode32;
			break;
		default:
			return EMULATION_FAILED;
		}

		ctxt->d &= ~(u64)GroupMask;
		ctxt->d |= opcode.flags;
	}

	/* Unrecognised? */
	if (ctxt->d == 0)
		return EMULATION_FAILED;

	ctxt->execute = opcode.u.execute;

	if (unlikely(ctxt->ud) && likely(!(ctxt->d & EmulateOnUD)))
		return EMULATION_FAILED;

	if (unlikely(ctxt->d &
	    (NotImpl|Stack|Op3264|Sse|Mmx|Intercept|CheckPerm|NearBranch|
	     No16))) {
		/*
                 * These are copied unconditionally here, and checked unconditionally
                 * in x86_emulate_insn.
                 */
		ctxt->check_perm = opcode.check_perm;
		ctxt->intercept = opcode.intercept;

		if (ctxt->d & NotImpl)
			return EMULATION_FAILED;

		if (mode == X86EMUL_MODE_PROT64) {
			if (ctxt->op_bytes == 4 && (ctxt->d & Stack))
				ctxt->op_bytes = 8;
			else if (ctxt->d & NearBranch)
				ctxt->op_bytes = 8;
		}

		if (ctxt->d & Op3264) {
			if (mode == X86EMUL_MODE_PROT64)
				ctxt->op_bytes = 8;
			else
				ctxt->op_bytes = 4;
		}

		if ((ctxt->d & No16) && ctxt->op_bytes == 2)
			ctxt->op_bytes = 4;

		if (ctxt->d & Sse)
			ctxt->op_bytes = 16;
		else if (ctxt->d & Mmx)
			ctxt->op_bytes = 8;
	}

	/* ModRM and SIB bytes. */
	if (ctxt->d & ModRM) {
		rc = decode_modrm(ctxt, &ctxt->memop);
		if (!has_seg_override) {
			has_seg_override = true;
			ctxt->seg_override = ctxt->modrm_seg;
		}
	} else if (ctxt->d & MemAbs)
		rc = decode_abs(ctxt, &ctxt->memop);
	if (rc != X86EMUL_CONTINUE)
		goto done;

	if (!has_seg_override)
		ctxt->seg_override = VCPU_SREG_DS;

	ctxt->memop.addr.mem.seg = ctxt->seg_override;

	/*
         * Decode and fetch the source operand: register, memory
         * or immediate.
         */
	rc = decode_operand(ctxt, &ctxt->src, (ctxt->d >> SrcShift) & OpMask);
	if (rc != X86EMUL_CONTINUE)
		goto done;

	/*
         * Decode and fetch the second source operand: register, memory
         * or immediate.
         */
	rc = decode_operand(ctxt, &ctxt->src2, (ctxt->d >> Src2Shift) & OpMask);
	if (rc != X86EMUL_CONTINUE)
		goto done;

	/* Decode and fetch the destination operand: register or memory. */
	rc = decode_operand(ctxt, &ctxt->dst, (ctxt->d >> DstShift) & OpMask);

	if (ctxt->rip_relative && likely(ctxt->memopp))
		ctxt->memopp->addr.mem.ea = address_mask(ctxt,
					ctxt->memopp->addr.mem.ea + ctxt->_eip);

done:
	return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK;
}

Contributors
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Avi Kivity
925
65.93%
22
39.29%
Nadav Amit
208
14.83%
8
14.29%
Gleb Natapov
68
4.85%
5
8.93%
Paolo Bonzini
68
4.85%
7
12.50%
Borislav Petkov
45
3.21%
2
3.57%
Bandan Das
33
2.35%
1
1.79%
Takuya Yoshikawa
23
1.64%
3
5.36%
Andre Przywara
18
1.28%
3
5.36%
Owen Hofmann
7
0.50%
1
1.79%
Joerg Roedel
6
0.43%
2
3.57%
Marcelo Tosatti
1
0.07%
1
1.79%
Wei Yongjun
1
0.07%
1
1.79%
Total
1403
100.00%
56
100.00%



bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt)
{
	return ctxt->d & PageTable;
}

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Xiao Guangrong
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%



static bool string_insn_completed(struct x86_emulate_ctxt *ctxt)
{
	/* The second termination condition only applies for REPE
         * and REPNE. Test if the repeat string operation prefix is
         * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
         * corresponding termination condition according to:
         *      - if REPE/REPZ and ZF = 0 then done
         *      - if REPNE/REPNZ and ZF = 1 then done
         */
	if (((ctxt->b == 0xa6) || (ctxt->b == 0xa7) ||
	     (ctxt->b == 0xae) || (ctxt->b == 0xaf))
	    && (((ctxt->rep_prefix == REPE_PREFIX) &&
		 ((ctxt->eflags & X86_EFLAGS_ZF) == 0))
		|| ((ctxt->rep_prefix == REPNE_PREFIX) &&
		    ((ctxt->eflags & X86_EFLAGS_ZF) == X86_EFLAGS_ZF))))
		return true;

	return false;
}

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Gleb Natapov
91
91.00%
1
33.33%
Avi Kivity
6
6.00%
1
33.33%
Nadav Amit
3
3.00%
1
33.33%
Total
100
100.00%
3
100.00%



static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt)
{
	int rc;

	ctxt->ops->get_fpu(ctxt);
	rc = asm_safe("fwait");
	ctxt->ops->put_fpu(ctxt);

	if (unlikely(rc != X86EMUL_CONTINUE))
		return emulate_exception(ctxt, MF_VECTOR, 0, false);

	return X86EMUL_CONTINUE;
}

Contributors
Person
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Avi Kivity
51
80.95%
1
50.00%
Radim Krčmář
12
19.05%
1
50.00%
Total
63
100.00%
2
100.00%



static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt,
				       struct operand *op)
{
	if (op->type == OP_MM)
		read_mmx_reg(ctxt, &op->mm_val, op->addr.mm);
}

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Avi Kivity
40
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1
100.00%
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40
100.00%
1
100.00%



static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *))
{
	ulong flags = (ctxt->eflags & EFLAGS_MASK) | X86_EFLAGS_IF;

	if (!(ctxt->d & ByteOp))
		fop += __ffs(ctxt->dst.bytes) * FASTOP_SIZE;

	asm("push %[flags]; popf; call *%[fastop]; pushf; pop %[flags]\n"
            : "+a"(ctxt->dst.val), "+d"(ctxt->src.val), [flags]"+D"(flags),
              [fastop]"+S"(fop), ASM_CALL_CONSTRAINT
            : "c"(ctxt->src2.val));

	ctxt->eflags = (ctxt->eflags & ~EFLAGS_MASK) | (flags & EFLAGS_MASK);
	if (!fop) /* exception is returned in fop variable */
		return emulate_de(ctxt);
	return X86EMUL_CONTINUE;
}

Contributors
Person
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Avi Kivity
93
98.94%
3
75.00%
Josh Poimboeuf
1
1.06%
1
25.00%
Total
94
100.00%
4
100.00%



void init_decode_cache(struct x86_emulate_ctxt *ctxt)
{
	memset(&ctxt->rip_relative, 0,
	       (void *)&ctxt->modrm - (void *)&ctxt->rip_relative);

	ctxt->io_read.pos = 0;
	ctxt->io_read.end = 0;
	ctxt->mem_read.end = 0;
}

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62
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3
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62
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3
100.00%



int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
{
	const struct x86_emulate_ops *ops = ctxt->ops;
	int rc = X86EMUL_CONTINUE;
	int saved_dst_type = ctxt->dst.type;
	unsigned emul_flags;

	ctxt->mem_read.pos = 0;

	/* LOCK prefix is allowed only with some instructions */
	if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) {
		rc = emulate_ud(ctxt);
		goto done;
	}

	if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) {
		rc = emulate_ud(ctxt);
		goto done;
	}

	emul_flags = ctxt->ops->get_hflags(ctxt);
	if (unlikely(ctxt->d &
		     (No64|Undefined|Sse|Mmx|Intercept|CheckPerm|Priv|Prot|String))) {
		if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
				(ctxt->d & Undefined)) {
			rc = emulate_ud(ctxt);
			goto done;
		}

		if (((ctxt->d & (Sse|Mmx)) && ((ops->get_cr(ctxt, 0) & X86_CR0_EM)))
		    || ((ctxt->d & Sse) && !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) {
			rc = emulate_ud(ctxt);
			goto done;
		}

		if ((ctxt->d & (Sse|Mmx)) && (ops->get_cr(ctxt, 0) & X86_CR0_TS)) {
			rc = emulate_nm(ctxt);
			goto done;
		}

		if (ctxt->d & Mmx) {
			rc = flush_pending_x87_faults(ctxt);
			if (rc != X86EMUL_CONTINUE)
				goto done;
			/*
                         * Now that we know the fpu is exception safe, we can fetch
                         * operands from it.
                         */
			fetch_possible_mmx_operand(ctxt, &ctxt->src);
			fetch_possible_mmx_operand(ctxt, &ctxt->src2);
			if (!(ctxt->d & Mov))
				fetch_possible_mmx_operand(ctxt, &ctxt->dst);
		}

		if (unlikely(emul_flags & X86EMUL_GUEST_MASK) && ctxt->intercept) {
			rc = emulator_check_intercept(ctxt, ctxt->intercept,
						      X86_ICPT_PRE_EXCEPT);
			if (rc != X86EMUL_CONTINUE)
				goto done;
		}

		/* Instruction can only be executed in protected mode */
		if ((ctxt->d & Prot) && ctxt->mode < X86EMUL_MODE_PROT16) {
			rc = emulate_ud(ctxt);
			goto done;
		}

		/* Privileged instruction can be executed only in CPL=0 */
		if ((ctxt->d & Priv) && ops->cpl(ctxt)) {
			if (ctxt->d & PrivUD)
				rc = emulate_ud(ctxt);
			else
				rc = emulate_gp(ctxt, 0);
			goto done;
		}

		/* Do instruction specific permission checks */
		if (ctxt->d & CheckPerm) {
			rc = ctxt->check_perm(ctxt);
			if (rc != X86EMUL_CONTINUE)
				goto done;
		}

		if (unlikely(emul_flags & X86EMUL_GUEST_MASK) && (ctxt->d & Intercept)) {
			rc = emulator_check_intercept(ctxt, ctxt->intercept,
						      X86_ICPT_POST_EXCEPT);
			if (rc != X86EMUL_CONTINUE)
				goto done;
		}

		if (ctxt->rep_prefix && (ctxt->d & String)) {
			/* All REP prefixes have the same first termination condition */
			if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) {
				string_registers_quirk(ctxt);
				ctxt->eip = ctxt->_eip;
				ctxt->eflags &= ~X86_EFLAGS_RF;
				goto done;
			}
		}
	}

	if ((ctxt->src.type == OP_MEM) && !(ctxt->d & NoAccess)) {
		rc = segmented_read(ctxt, ctxt->src.addr.mem,
				    ctxt->src.valptr, ctxt->src.bytes);
		if (rc != X86EMUL_CONTINUE)
			goto done;
		ctxt->src.orig_val64 = ctxt->src.val64;
	}

	if (ctxt->src2.type == OP_MEM) {
		rc = segmented_read(ctxt, ctxt->src2.addr.mem,
				    &ctxt->src2.val, ctxt->src2.bytes);
		if (rc != X86EMUL_CONTINUE)
			goto done;
	}

	if ((ctxt->d & DstMask) == ImplicitOps)
		goto special_insn;


	if ((ctxt->dst.type == OP_MEM) && !(ctxt->d & Mov)) {
		/* optimisation - avoid slow emulated read if Mov */
		rc = segmented_read(ctxt, ctxt->dst.addr.mem,
				   &ctxt->dst.val, ctxt->dst.bytes);
		if (rc != X86EMUL_CONTINUE) {
			if (!(ctxt->d & NoWrite) &&
			    rc == X86EMUL_PROPAGATE_FAULT &&
			    ctxt->exception.vector == PF_VECTOR)
				ctxt->exception.error_code |= PFERR_WRITE_MASK;
			goto done;
		}
	}
	/* Copy full 64-bit value for CMPXCHG8B.  */
	ctxt->dst.orig_val64 = ctxt->dst.val64;

special_insn:

	if (unlikely(emul_flags & X86EMUL_GUEST_MASK) && (ctxt->d & Intercept)) {
		rc = emulator_check_intercept(ctxt, ctxt->intercept,
					      X86_ICPT_POST_MEMACCESS);
		if (rc != X86EMUL_CONTINUE)
			goto done;
	}

	if (ctxt->rep_prefix && (ctxt->d & String))
		ctxt->eflags |= X86_EFLAGS_RF;
	else
		ctxt->eflags &= ~X86_EFLAGS_RF;

	if (ctxt->execute) {
		if (ctxt->d & Fastop) {
			void (*fop)(struct fastop *) = (void *)ctxt->execute;
			rc = fastop(ctxt, fop);
			if (rc != X86EMUL_CONTINUE)
				goto done;
			goto writeback;
		}
		rc = ctxt->execute(ctxt);
		if (rc != X86EMUL_CONTINUE)
			goto done;
		goto writeback;
	}

	if (ctxt->opcode_len == 2)
		goto twobyte_insn;
	else if (ctxt->opcode_len == 3)
		goto threebyte_insn;

	switch (ctxt->b) {
	case 0x70 ... 0x7f: /* jcc (short) */
		if (test_cc(ctxt->b, ctxt->eflags))
			rc = jmp_rel(ctxt, ctxt->src.val);
		break;
	case 0x8d: /* lea r16/r32, m */
		ctxt->dst.val = ctxt->src.addr.mem.ea;
		break;
	case 0x90 ... 0x97: /* nop / xchg reg, rax */
		if (ctxt->dst.addr.reg == reg_rmw(ctxt, VCPU_REGS_RAX))
			ctxt->dst.type = OP_NONE;
		else
			rc = em_xchg(ctxt);
		break;
	case 0x98: /* cbw/cwde/cdqe */
		switch (ctxt->op_bytes) {
		case 2: ctxt->dst.val = (s8)ctxt->dst.val; break;
		case 4: ctxt->dst.val = (s16)ctxt->dst.val; break;
		case 8: ctxt->dst.val = (s32)ctxt->dst.val; break;
		}
		break;
	case 0xcc:		/* int3 */
		rc = emulate_int(ctxt, 3);
		break;
	case 0xcd:		/* int n */
		rc = emulate_int(ctxt, ctxt->src.val);
		break;
	case 0xce:		/* into */
		if (ctxt->eflags & X86_EFLAGS_OF)
			rc = emulate_int(ctxt, 4);
		break;
	case 0xe9: /* jmp rel */
	case 0xeb: /* jmp rel short */
		rc = jmp_rel(ctxt, ctxt->src.val);
		ctxt->dst.type = OP_NONE; /* Disable writeback. */
		break;
	case 0xf4:              /* hlt */
		ctxt->ops->halt(ctxt);
		break;
	case 0xf5:	/* cmc */
		/* complement carry flag from eflags reg */
		ctxt->eflags ^= X86_EFLAGS_CF;
		break;
	case 0xf8: /* clc */
		ctxt->eflags &= ~X86_EFLAGS_CF;
		break;
	case 0xf9: /* stc */
		ctxt->eflags |= X86_EFLAGS_CF;
		break;
	case 0xfc: /* cld */
		ctxt->eflags &= ~X86_EFLAGS_DF;
		break;
	case 0xfd: /* std */
		ctxt->eflags |= X86_EFLAGS_DF;
		break;
	default:
		goto cannot_emulate;
	}

	if (rc != X86EMUL_CONTINUE)
		goto done;

writeback:
	if (ctxt->d & SrcWrite) {
		BUG_ON(ctxt->src.type == OP_MEM || ctxt->src.type == OP_MEM_STR);
		rc = writeback(ctxt, &ctxt->src);
		if (rc != X86EMUL_CONTINUE)
			goto done;
	}
	if (!(ctxt->d & NoWrite)) {
		rc = writeback(ctxt, &ctxt->dst);
		if (rc != X86EMUL_CONTINUE)
			goto done;
	}

	/*
         * restore dst type in case the decoding will be reused
         * (happens for string instruction )
         */
	ctxt->dst.type = saved_dst_type;

	if ((ctxt->d & SrcMask) == SrcSI)
		string_addr_inc(ctxt, VCPU_REGS_RSI, &ctxt->src);

	if ((ctxt->d & DstMask) == DstDI)
		string_addr_inc(ctxt, VCPU_REGS_RDI, &ctxt->dst);

	if (ctxt->rep_prefix && (ctxt->d & String)) {
		unsigned int count;
		struct read_cache *r = &ctxt->io_read;
		if ((ctxt->d & SrcMask) == SrcSI)
			count = ctxt->src.count;
		else
			count = ctxt->dst.count;
		register_address_increment(ctxt, VCPU_REGS_RCX, -count);

		if (!string_insn_completed(ctxt)) {
			/*
                         * Re-enter guest when pio read ahead buffer is empty
                         * or, if it is not used, after each 1024 iteration.
                         */
			if ((r->end != 0 || reg_read(ctxt, VCPU_REGS_RCX) & 0x3ff) &&
			    (r->end == 0 || r->end != r->pos)) {
				/*
                                 * Reset read cache. Usually happens before
                                 * decode, but since instruction is restarted
                                 * we have to do it here.
                                 */
				ctxt->mem_read.end = 0;
				writeback_registers(ctxt);
				return EMULATION_RESTART;
			}
			goto done; /* skip rip writeback */
		}
		ctxt->eflags &= ~X86_EFLAGS_RF;
	}

	ctxt->eip = ctxt->_eip;

done:
	if (rc == X86EMUL_PROPAGATE_FAULT) {
		WARN_ON(ctxt->exception.vector > 0x1f);
		ctxt->have_exception = true;
	}
	if (rc == X86EMUL_INTERCEPTED)
		return EMULATION_INTERCEPTED;

	if (rc == X86EMUL_CONTINUE)
		writeback_registers(ctxt);

	return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;

twobyte_insn:
	switch (ctxt->b) {
	case 0x09:		/* wbinvd */
		(ctxt->ops->wbinvd)(ctxt);
		break;
	case 0x08:		/* invd */
	case 0x0d:		/* GrpP (prefetch) */
	case 0x18:		/* Grp16 (prefetch/nop) */
	case 0x1f:		/* nop */
		break;
	case 0x20: /* mov cr, reg */
		ctxt->dst.val = ops->get_cr(ctxt, ctxt->modrm_reg);
		break;
	case 0x21: /* mov from dr to reg */
		ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val);
		break;
	case 0x40 ... 0x4f:	/* cmov */
		if (test_cc(ctxt->b, ctxt->eflags))
			ctxt->dst.val = ctxt->src.val;
		else if (ctxt->op_bytes != 4)
			ctxt->dst.type = OP_NONE; /* no writeback */
		break;
	case 0x80 ... 0x8f: /* jnz rel, etc*/
		if (test_cc(ctxt->b, ctxt->eflags))
			rc = jmp_rel(ctxt, ctxt->src.val);
		break;
	case 0x90 ... 0x9f:     /* setcc r/m8 */
		ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags);
		break;
	case 0xb6 ... 0xb7:	/* movzx */
		ctxt->dst.bytes = ctxt->op_bytes;
		ctxt->dst.val = (ctxt->src.bytes == 1) ? (u8) ctxt->src.val
						       : (u16) ctxt->src.val;
		break;
	case 0xbe ... 0xbf:	/* movsx */
		ctxt->dst.bytes = ctxt->op_bytes;
		ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val :
							(s16) ctxt->src.val;
		break;
	default:
		goto cannot_emulate;
	}

threebyte_insn:

	if (rc != X86EMUL_CONTINUE)
		goto done;

	goto writeback;

cannot_emulate:
	return EMULATION_FAILED;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
984
48.19%
37
31.90%
Gleb Natapov
330
16.16%
26
22.41%
Nadav Amit
179
8.77%
11
9.48%
Laurent Vivier
121
5.93%
4
3.45%
Paolo Bonzini
101
4.95%
7
6.03%
Wei Yongjun
91
4.46%
3
2.59%
Mohammed Gamal
74
3.62%
6
5.17%
Takuya Yoshikawa
38
1.86%
6
5.17%
Nitin A. Kamble
28
1.37%
3
2.59%
Joerg Roedel
27
1.32%
2
1.72%
Borislav Petkov
17
0.83%
2
1.72%
Ladi Prosek
14
0.69%
1
0.86%
Bandan Das
13
0.64%
1
0.86%
Sheng Yang
10
0.49%
2
1.72%
Harvey Harrison
6
0.29%
1
0.86%
Mike Day
4
0.20%
1
0.86%
Anthony Liguori
2
0.10%
1
0.86%
Clemens Noss
2
0.10%
1
0.86%
Mathias Krause
1
0.05%
1
0.86%
Total
2042
100.00%
116
100.00%



void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt)
{
	invalidate_registers(ctxt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt)
{
	writeback_registers(ctxt);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt)
{
	if (ctxt->rep_prefix && (ctxt->d & String))
		return false;

	if (ctxt->d & TwoMemOp)
		return false;

	return true;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Lendacky
41
100.00%
1
100.00%
Total
41
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Avi Kivity
16913
54.79%
178
34.97%
Paolo Bonzini
2906
9.41%
38
7.47%
Nadav Amit
2795
9.06%
76
14.93%
Gleb Natapov
1969
6.38%
47
9.23%
Joerg Roedel
1427
4.62%
11
2.16%
Takuya Yoshikawa
1407
4.56%
39
7.66%
Wei Yongjun
433
1.40%
18
3.54%
Borislav Petkov
430
1.39%
4
0.79%
Radim Krčmář
376
1.22%
7
1.38%
Mohammed Gamal
339
1.10%
10
1.96%
Kevin Wolf
251
0.81%
3
0.59%
Laurent Vivier
165
0.53%
7
1.38%
Bandan Das
159
0.52%
6
1.18%
Stephan Bärwolf
155
0.50%
1
0.20%
Nick Desaulniers
136
0.44%
2
0.39%
Nelson Elhage
112
0.36%
2
0.39%
Yu Zhang
107
0.35%
4
0.79%
Xiao Guangrong
78
0.25%
4
0.79%
Steve Rutherford
78
0.25%
1
0.20%
Mathias Krause
63
0.20%
3
0.59%
Igor Mammedov
56
0.18%
2
0.39%
Tom Lendacky
54
0.17%
1
0.20%
Bruce Rogers
52
0.17%
1
0.20%
Harvey Harrison
49
0.16%
3
0.59%
Nitin A. Kamble
46
0.15%
4
0.79%
Ladi Prosek
44
0.14%
1
0.20%
Kyle Huey
44
0.14%
1
0.20%
Andre Przywara
40
0.13%
5
0.98%
Guillaume Thouvenin
36
0.12%
6
1.18%
Alex Williamson
34
0.11%
1
0.20%
Marcelo Tosatti
24
0.08%
2
0.39%
Stefan Hajnoczi
18
0.06%
1
0.20%
Josh Poimboeuf
17
0.06%
4
0.79%
Jan Kiszka
12
0.04%
2
0.39%
Sheng Yang
12
0.04%
3
0.59%
Owen Hofmann
7
0.02%
1
0.20%
Mike Day
4
0.01%
1
0.20%
Guo Chao
4
0.01%
1
0.20%
Wanpeng Li
3
0.01%
1
0.20%
Glauber de Oliveira Costa
2
0.01%
1
0.20%
Anthony Liguori
2
0.01%
1
0.20%
Aurelien Jarno
2
0.01%
1
0.20%
Clemens Noss
2
0.01%
1
0.20%
Randy Dunlap
1
0.00%
1
0.20%
Nicolas Kaiser
1
0.00%
1
0.20%
Mark D Rustad
1
0.00%
1
0.20%
Total
30866
100.00%
509
100.00%
Directory: arch/x86/kvm

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