1. 根目录:
2. arch
3. sparc
4. net
5. bpf_jit.h

#ifndef _BPF_JIT_H
#define _BPF_JIT_H

/* Conventions:
 *  %g1 : temporary
 *  %g2 : Secondary temporary used by SKB data helper stubs.
 *  %g3 : packet offset passed into SKB data helper stubs.
 *  %o0 : pointer to skb (first argument given to JIT function)
 *  %o1 : BPF A accumulator
 *  %o2 : BPF X accumulator
 *  %o3 : Holds saved %o7 so we can call helper functions without needing
 *        to allocate a register window.
 *  %o4 : skb->len - skb->data_len
 *  %o5 : skb->data
 */

#ifndef __ASSEMBLER__
#define G0		0x00
#define G1		0x01
#define G3		0x03
#define G6		0x06
#define O0		0x08
#define O1		0x09
#define O2		0x0a
#define O3		0x0b
#define O4		0x0c
#define O5		0x0d
#define SP		0x0e
#define O7		0x0f
#define FP		0x1e

#define r_SKB		O0
#define r_A		O1
#define r_X		O2
#define r_saved_O7	O3
#define r_HEADLEN	O4
#define r_SKB_DATA	O5
#define r_TMP		G1
#define r_TMP2		G2
#define r_OFF		G3

/* assembly code in arch/sparc/net/bpf_jit_asm.S */
extern u32 bpf_jit_load_word[];
extern u32 bpf_jit_load_half[];
extern u32 bpf_jit_load_byte[];
extern u32 bpf_jit_load_byte_msh[];
extern u32 bpf_jit_load_word_positive_offset[];
extern u32 bpf_jit_load_half_positive_offset[];
extern u32 bpf_jit_load_byte_positive_offset[];
extern u32 bpf_jit_load_byte_msh_positive_offset[];
extern u32 bpf_jit_load_word_negative_offset[];
extern u32 bpf_jit_load_half_negative_offset[];
extern u32 bpf_jit_load_byte_negative_offset[];
extern u32 bpf_jit_load_byte_msh_negative_offset[];

#else
#define r_SKB		%o0
#define r_A		%o1
#define r_X		%o2
#define r_saved_O7	%o3
#define r_HEADLEN	%o4
#define r_SKB_DATA	%o5
#define r_TMP		%g1
#define r_TMP2		%g2
#define r_OFF		%g3
#endif

#endif /* _BPF_JIT_H */