/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2001 PPC64 Team, IBM Corp * * This struct defines the way the registers are stored on the * kernel stack during a system call or other kernel entry. * * this should only contain volatile regs * since we can keep non-volatile in the thread_struct * should set this up when only volatiles are saved * by intr code. * * Since this is going on the stack, *CARE MUST BE TAKEN* to insure * that the overall structure is a multiple of 16 bytes in length. * * Note that the offsets of the fields in this struct correspond with * the PT_* values below. This simplifies arch/powerpc/kernel/ptrace.c. */ #ifndef _ASM_POWERPC_PTRACE_H #define _ASM_POWERPC_PTRACE_H #include <linux/err.h> #include <uapi/asm/ptrace.h> #include <asm/asm-const.h> #include <asm/reg.h> #ifndef __ASSEMBLY__ struct pt_regs { union { struct user_pt_regs user_regs; struct { unsigned long gpr[32]; unsigned long nip; unsigned long msr; unsigned long orig_gpr3; unsigned long ctr; unsigned long link; unsigned long xer; unsigned long ccr; #ifdef CONFIG_PPC64 unsigned long softe; #else unsigned long mq; #endif unsigned long trap; union { unsigned long dar; unsigned long dear; }; union { unsigned long dsisr; unsigned long esr; }; unsigned long result; }; }; #if defined(CONFIG_PPC64) || defined(CONFIG_PPC_KUAP) union { struct { #ifdef CONFIG_PPC64 unsigned long ppr; unsigned long exit_result; #endif union { #ifdef CONFIG_PPC_KUAP unsigned long kuap; #endif #ifdef CONFIG_PPC_PKEY unsigned long amr; #endif }; #ifdef CONFIG_PPC_PKEY unsigned long iamr; #endif }; unsigned long __pad[4]; /* Maintain 16 byte interrupt stack alignment */ }; #endif #if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE) struct { /* Must be a multiple of 16 bytes */ unsigned long mas0; unsigned long mas1; unsigned long mas2; unsigned long mas3; unsigned long mas6; unsigned long mas7; unsigned long srr0; unsigned long srr1; unsigned long csrr0; unsigned long csrr1; unsigned long dsrr0; unsigned long dsrr1; }; #endif }; #endif // Always displays as "REGS" in memory dumps #ifdef CONFIG_CPU_BIG_ENDIAN #define STACK_FRAME_REGS_MARKER ASM_CONST(0x52454753) #else #define STACK_FRAME_REGS_MARKER ASM_CONST(0x53474552) #endif #ifdef __powerpc64__ /* * Size of redzone that userspace is allowed to use below the stack * pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in * the new ELFv2 little-endian ABI, so we allow the larger amount. * * For kernel code we allow a 288-byte redzone, in order to conserve * kernel stack space; gcc currently only uses 288 bytes, and will * hopefully allow explicit control of the redzone size in future. */ #define USER_REDZONE_SIZE 512 #define KERNEL_REDZONE_SIZE 288 #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */ #ifdef CONFIG_PPC64_ELF_ABI_V2 #define STACK_FRAME_MIN_SIZE 32 #define STACK_USER_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_MIN_SIZE + 16) #define STACK_INT_FRAME_REGS (STACK_FRAME_MIN_SIZE + 16) #define STACK_INT_FRAME_MARKER STACK_FRAME_MIN_SIZE #define STACK_SWITCH_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_MIN_SIZE + 16) #define STACK_SWITCH_FRAME_REGS (STACK_FRAME_MIN_SIZE + 16) #else /* * The ELFv1 ABI specifies 48 bytes plus a minimum 64 byte parameter save * area. This parameter area is not used by calls to C from interrupt entry, * so the second from last one of those is used for the frame marker. */ #define STACK_FRAME_MIN_SIZE 112 #define STACK_USER_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_MIN_SIZE) #define STACK_INT_FRAME_REGS STACK_FRAME_MIN_SIZE #define STACK_INT_FRAME_MARKER (STACK_FRAME_MIN_SIZE - 16) #define STACK_SWITCH_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_MIN_SIZE) #define STACK_SWITCH_FRAME_REGS STACK_FRAME_MIN_SIZE #endif /* Size of dummy stack frame allocated when calling signal handler. */ #define __SIGNAL_FRAMESIZE 128 #define __SIGNAL_FRAMESIZE32 64 #else /* __powerpc64__ */ #define USER_REDZONE_SIZE 0 #define KERNEL_REDZONE_SIZE 0 #define STACK_FRAME_MIN_SIZE 16 #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */ #define STACK_USER_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_MIN_SIZE) #define STACK_INT_FRAME_REGS STACK_FRAME_MIN_SIZE #define STACK_INT_FRAME_MARKER (STACK_FRAME_MIN_SIZE - 8) #define STACK_SWITCH_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_MIN_SIZE) #define STACK_SWITCH_FRAME_REGS STACK_FRAME_MIN_SIZE /* Size of stack frame allocated when calling signal handler. */ #define __SIGNAL_FRAMESIZE 64 #endif /* __powerpc64__ */ #define STACK_INT_FRAME_SIZE (KERNEL_REDZONE_SIZE + STACK_USER_INT_FRAME_SIZE) #define STACK_INT_FRAME_MARKER_LONGS (STACK_INT_FRAME_MARKER/sizeof(long)) #ifndef __ASSEMBLY__ #include <asm/paca.h> #ifdef CONFIG_SMP extern unsigned long profile_pc(struct pt_regs *regs); #else #define profile_pc(regs) instruction_pointer(regs) #endif long do_syscall_trace_enter(struct pt_regs *regs); void do_syscall_trace_leave(struct pt_regs *regs); static inline void set_return_regs_changed(void) { #ifdef CONFIG_PPC_BOOK3S_64 local_paca->hsrr_valid = 0; local_paca->srr_valid = 0; #endif } static inline void regs_set_return_ip(struct pt_regs *regs, unsigned long ip) { regs->nip = ip; set_return_regs_changed(); } static inline void regs_set_return_msr(struct pt_regs *regs, unsigned long msr) { regs->msr = msr; set_return_regs_changed(); } static inline void regs_add_return_ip(struct pt_regs *regs, long offset) { regs_set_return_ip(regs, regs->nip + offset); } static inline unsigned long instruction_pointer(struct pt_regs *regs) { return regs->nip; } static inline void instruction_pointer_set(struct pt_regs *regs, unsigned long val) { regs_set_return_ip(regs, val); } static inline unsigned long user_stack_pointer(struct pt_regs *regs) { return regs->gpr[1]; } static inline unsigned long frame_pointer(struct pt_regs *regs) { return 0; } #define user_mode(regs) (((regs)->msr & MSR_PR) != 0) #define force_successful_syscall_return() \ do { \ set_thread_flag(TIF_NOERROR); \ } while(0) #define current_pt_regs() \ ((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1) /* * The 4 low bits (0xf) are available as flags to overload the trap word, * because interrupt vectors have minimum alignment of 0x10. TRAP_FLAGS_MASK * must cover the bits used as flags, including bit 0 which is used as the * "norestart" bit. */ #ifdef __powerpc64__ #define TRAP_FLAGS_MASK 0x1 #else /* * On 4xx we use bit 1 in the trap word to indicate whether the exception * is a critical exception (1 means it is). */ #define TRAP_FLAGS_MASK 0xf #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0) #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0) #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0) #endif /* __powerpc64__ */ #define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK) static __always_inline void set_trap(struct pt_regs *regs, unsigned long val) { regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK); } static inline bool trap_is_scv(struct pt_regs *regs) { return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000); } static inline bool trap_is_unsupported_scv(struct pt_regs *regs) { return IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x7ff0; } static inline bool trap_is_syscall(struct pt_regs *regs) { return (trap_is_scv(regs) || TRAP(regs) == 0xc00); } static inline bool trap_norestart(struct pt_regs *regs) { return regs->trap & 0x1; } static __always_inline void set_trap_norestart(struct pt_regs *regs) { regs->trap |= 0x1; } #define kernel_stack_pointer(regs) ((regs)->gpr[1]) static inline int is_syscall_success(struct pt_regs *regs) { if (trap_is_scv(regs)) return !IS_ERR_VALUE((unsigned long)regs->gpr[3]); else return !(regs->ccr & 0x10000000); } static inline long regs_return_value(struct pt_regs *regs) { if (trap_is_scv(regs)) return regs->gpr[3]; if (is_syscall_success(regs)) return regs->gpr[3]; else return -regs->gpr[3]; } static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc) { regs->gpr[3] = rc; } static inline bool cpu_has_msr_ri(void) { return !IS_ENABLED(CONFIG_BOOKE_OR_40x); } static inline bool regs_is_unrecoverable(struct pt_regs *regs) { return unlikely(cpu_has_msr_ri() && !(regs->msr & MSR_RI)); } static inline void regs_set_recoverable(struct pt_regs *regs) { if (cpu_has_msr_ri()) regs_set_return_msr(regs, regs->msr | MSR_RI); } static inline void regs_set_unrecoverable(struct pt_regs *regs) { if (cpu_has_msr_ri()) regs_set_return_msr(regs, regs->msr & ~MSR_RI); } #define arch_has_single_step() (1) #define arch_has_block_step() (true) #define ARCH_HAS_USER_SINGLE_STEP_REPORT /* * kprobe-based event tracer support */ #include <linux/stddef.h> #include <linux/thread_info.h> extern int regs_query_register_offset(const char *name); extern const char *regs_query_register_name(unsigned int offset); #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr)) /** * regs_get_register() - get register value from its offset * @regs: pt_regs from which register value is gotten * @offset: offset number of the register. * * regs_get_register returns the value of a register whose offset from @regs. * The @offset is the offset of the register in struct pt_regs. * If @offset is bigger than MAX_REG_OFFSET, this returns 0. */ static inline unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) { if (unlikely(offset > MAX_REG_OFFSET)) return 0; return *(unsigned long *)((unsigned long)regs + offset); } /** * regs_within_kernel_stack() - check the address in the stack * @regs: pt_regs which contains kernel stack pointer. * @addr: address which is checked. * * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). * If @addr is within the kernel stack, it returns true. If not, returns false. */ static inline bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) { return ((addr & ~(THREAD_SIZE - 1)) == (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); } /** * regs_get_kernel_stack_nth() - get Nth entry of the stack * @regs: pt_regs which contains kernel stack pointer. * @n: stack entry number. * * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which * is specified by @regs. If the @n th entry is NOT in the kernel stack, * this returns 0. */ static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) { unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); addr += n; if (regs_within_kernel_stack(regs, (unsigned long)addr)) return *addr; else return 0; } #endif /* __ASSEMBLY__ */ #ifndef __powerpc64__ /* We need PT_SOFTE defined at all time to avoid #ifdefs */ #define PT_SOFTE PT_MQ #else /* __powerpc64__ */ #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */ #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */ #define PT_VSCR_32 (PT_VR0 + 32*4 + 3) #define PT_VRSAVE_32 (PT_VR0 + 33*4) #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */ #endif /* __powerpc64__ */ #endif /* _ASM_POWERPC_PTRACE_H */