Release 4.14 arch/powerpc/net/bpf_jit32.h

/*
 * bpf_jit32.h: BPF JIT compiler for PPC
 *
 * Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation
 *
 * Split from bpf_jit.h
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 */
#ifndef _BPF_JIT32_H

#define _BPF_JIT32_H

#include "bpf_jit.h"

#ifdef CONFIG_PPC64

#define BPF_PPC_STACK_R3_OFF	48

#define BPF_PPC_STACK_LOCALS	32

#define BPF_PPC_STACK_BASIC	(48+64)

#define BPF_PPC_STACK_SAVE	(18*8)

#define BPF_PPC_STACKFRAME	(BPF_PPC_STACK_BASIC+BPF_PPC_STACK_LOCALS+ \
                                 BPF_PPC_STACK_SAVE)

#define BPF_PPC_SLOWPATH_FRAME	(48+64)
#else

#define BPF_PPC_STACK_R3_OFF	24

#define BPF_PPC_STACK_LOCALS	16

#define BPF_PPC_STACK_BASIC	(24+32)

#define BPF_PPC_STACK_SAVE	(18*4)

#define BPF_PPC_STACKFRAME	(BPF_PPC_STACK_BASIC+BPF_PPC_STACK_LOCALS+ \
                                 BPF_PPC_STACK_SAVE)

#define BPF_PPC_SLOWPATH_FRAME	(24+32)
#endif


#define REG_SZ         (BITS_PER_LONG/8)

/*
 * Generated code register usage:
 *
 * As normal PPC C ABI (e.g. r1=sp, r2=TOC), with:
 *
 * skb          r3      (Entry parameter)
 * A register   r4
 * X register   r5
 * addr param   r6
 * r7-r10       scratch
 * skb->data    r14
 * skb headlen  r15     (skb->len - skb->data_len)
 * m[0]         r16
 * m[...]       ...
 * m[15]        r31
 */

#define r_skb		3

#define r_ret		3

#define r_A		4

#define r_X		5

#define r_addr		6

#define r_scratch1	7

#define r_scratch2	8

#define r_D		14

#define r_HL		15

#define r_M		16

#ifndef __ASSEMBLY__

/*
 * Assembly helpers from arch/powerpc/net/bpf_jit.S:
 */

#define DECLARE_LOAD_FUNC(func)	\
	extern u8 func[], func##_negative_offset[], func##_positive_offset[]


DECLARE_LOAD_FUNC(sk_load_word);

DECLARE_LOAD_FUNC(sk_load_half);

DECLARE_LOAD_FUNC(sk_load_byte);

DECLARE_LOAD_FUNC(sk_load_byte_msh);


#define PPC_LBZ_OFFS(r, base, i) do { if ((i) < 32768) PPC_LBZ(r, base, i);   \
                else {  PPC_ADDIS(r, base, IMM_HA(i));                        \
                        PPC_LBZ(r, r, IMM_L(i)); } } while(0)


#define PPC_LD_OFFS(r, base, i) do { if ((i) < 32768) PPC_LD(r, base, i);     \
                else {  PPC_ADDIS(r, base, IMM_HA(i));                        \
                        PPC_LD(r, r, IMM_L(i)); } } while(0)


#define PPC_LWZ_OFFS(r, base, i) do { if ((i) < 32768) PPC_LWZ(r, base, i);   \
                else {  PPC_ADDIS(r, base, IMM_HA(i));                        \
                        PPC_LWZ(r, r, IMM_L(i)); } } while(0)


#define PPC_LHZ_OFFS(r, base, i) do { if ((i) < 32768) PPC_LHZ(r, base, i);   \
                else {  PPC_ADDIS(r, base, IMM_HA(i));                        \
                        PPC_LHZ(r, r, IMM_L(i)); } } while(0)

#ifdef CONFIG_PPC64

#define PPC_LL_OFFS(r, base, i) do { PPC_LD_OFFS(r, base, i); } while(0)
#else

#define PPC_LL_OFFS(r, base, i) do { PPC_LWZ_OFFS(r, base, i); } while(0)
#endif

#ifdef CONFIG_SMP
#ifdef CONFIG_PPC64

#define PPC_BPF_LOAD_CPU(r)		\
	do { BUILD_BUG_ON(FIELD_SIZEOF(struct paca_struct, paca_index) != 2);   \
                PPC_LHZ_OFFS(r, 13, offsetof(struct paca_struct, paca_index));  \
        } while (0)
#else

#define PPC_BPF_LOAD_CPU(r)     \
	do { BUILD_BUG_ON(FIELD_SIZEOF(struct thread_info, cpu) != 4);          \
                PPC_LHZ_OFFS(r, (1 & ~(THREAD_SIZE - 1)),                       \
                                offsetof(struct thread_info, cpu));             \
        } while(0)
#endif
#else

#define PPC_BPF_LOAD_CPU(r) do { PPC_LI(r, 0); } while(0)
#endif


#define PPC_LHBRX_OFFS(r, base, i) \
		do { PPC_LI32(r, i); PPC_LHBRX(r, r, base); } while(0)
#ifdef __LITTLE_ENDIAN__

#define PPC_NTOHS_OFFS(r, base, i)	PPC_LHBRX_OFFS(r, base, i)
#else

#define PPC_NTOHS_OFFS(r, base, i)	PPC_LHZ_OFFS(r, base, i)
#endif


#define SEEN_DATAREF 0x10000 
/* might call external helpers */

#define SEEN_XREG    0x20000 
/* X reg is used */

#define SEEN_MEM     0x40000 
/* SEEN_MEM+(1<<n) = use mem[n] for temporary
                              * storage */

#define SEEN_MEM_MSK 0x0ffff


struct codegen_context {
	
unsigned int seen;
	
unsigned int idx;
	
int pc_ret0; /* bpf index of first RET #0 instruction (if any) */
};

#endif

#endif
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