584c5e2ad3
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>
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
#ifndef _BPF_JIT_H
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#define _BPF_JIT_H
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/* Conventions:
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* %g1 : temporary
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* %g2 : Secondary temporary used by SKB data helper stubs.
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* %g3 : packet offset passed into SKB data helper stubs.
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* %o0 : pointer to skb (first argument given to JIT function)
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* %o1 : BPF A accumulator
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* %o2 : BPF X accumulator
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* %o3 : Holds saved %o7 so we can call helper functions without needing
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* to allocate a register window.
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* %o4 : skb->len - skb->data_len
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* %o5 : skb->data
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*/
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#ifndef __ASSEMBLER__
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#define G0 0x00
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#define G1 0x01
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#define G3 0x03
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#define G6 0x06
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#define O0 0x08
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#define O1 0x09
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#define O2 0x0a
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#define O3 0x0b
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#define O4 0x0c
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#define O5 0x0d
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#define SP 0x0e
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#define O7 0x0f
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#define FP 0x1e
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#define r_SKB O0
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#define r_A O1
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#define r_X O2
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#define r_saved_O7 O3
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#define r_HEADLEN O4
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#define r_SKB_DATA O5
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#define r_TMP G1
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#define r_TMP2 G2
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#define r_OFF G3
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/* assembly code in arch/sparc/net/bpf_jit_asm.S */
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extern u32 bpf_jit_load_word[];
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extern u32 bpf_jit_load_half[];
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extern u32 bpf_jit_load_byte[];
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extern u32 bpf_jit_load_byte_msh[];
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extern u32 bpf_jit_load_word_positive_offset[];
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extern u32 bpf_jit_load_half_positive_offset[];
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extern u32 bpf_jit_load_byte_positive_offset[];
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extern u32 bpf_jit_load_byte_msh_positive_offset[];
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extern u32 bpf_jit_load_word_negative_offset[];
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extern u32 bpf_jit_load_half_negative_offset[];
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extern u32 bpf_jit_load_byte_negative_offset[];
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extern u32 bpf_jit_load_byte_msh_negative_offset[];
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#else
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#define r_SKB %o0
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#define r_A %o1
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#define r_X %o2
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#define r_saved_O7 %o3
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#define r_HEADLEN %o4
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#define r_SKB_DATA %o5
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#define r_TMP %g1
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#define r_TMP2 %g2
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#define r_OFF %g3
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#endif
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#endif /* _BPF_JIT_H */
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