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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sparc/net/bpf_jit_32.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#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_32.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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