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linux-sg2042/arch/sparc/net/bpf_jit.h

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net: filter: Just In Time compiler for sparc Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-16 11:06:27 +08:00
#ifndef _BPF_JIT_H
#define _BPF_JIT_H
/* Conventions:
* %g1 : temporary
* %g2 : Secondary temporary used by SKB data helper stubs.
net: filter: Fix some minor issues in sparc JIT. Correct conventions comments. %o4 and %o5 were swapped, %g3 was not documented. Use r_TMP instead of r_SKB_DATA + r_OFF where possible in assembler stubs. Correct discussion of %o4 and %o5 in one of bpf_jit_compile()'s comments. Based upon feedback from Richard Mortimer. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-18 04:08:29 +08:00
* %g3 : packet offset passed into SKB data helper stubs.
net: filter: Just In Time compiler for sparc Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-16 11:06:27 +08:00
* %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.
net: filter: Fix some minor issues in sparc JIT. Correct conventions comments. %o4 and %o5 were swapped, %g3 was not documented. Use r_TMP instead of r_SKB_DATA + r_OFF where possible in assembler stubs. Correct discussion of %o4 and %o5 in one of bpf_jit_compile()'s comments. Based upon feedback from Richard Mortimer. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-18 04:08:29 +08:00
* %o4 : skb->len - skb->data_len
* %o5 : skb->data
net: filter: Just In Time compiler for sparc Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-16 11:06:27 +08:00
*/
#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
net: filter: Fix some more small issues in sparc JIT. Fix mixed space and tabs. Put bpf_jit_load_*[] externs into bpf_jit.h "while(0)" --> "while (0)" "COND (X)" --> "COND(X)" Document branch offset calculations, and bpf_error's return sequence. Document the reason we need to emit three nops between the %y register write and the divide instruction. Remove erroneous trailing semicolons from emit_read_y() and emit_write_y(). Based upon feedback from Sam Ravnborg. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-18 04:38:16 +08:00
/* 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[];
net: filter: Just In Time compiler for sparc Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-16 11:06:27 +08:00
#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 */