libbpf: Add BPF_EMBED_OBJ macro for embedding BPF .o files
Add a convenience macro BPF_EMBED_OBJ, which allows to embed other files (typically used to embed BPF .o files) into a hosting userspace programs. To C program it is exposed as struct bpf_embed_data, containing a pointer to raw data and its size in bytes. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20191214014341.3442258-5-andriin@fb.com
This commit is contained in:
committed by
Alexei Starovoitov
parent
612d05be25
commit
917f6b7b07
@ -615,6 +615,41 @@ bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear);
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*/
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LIBBPF_API int libbpf_num_possible_cpus(void);
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struct bpf_embed_data {
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void *data;
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size_t size;
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};
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#define BPF_EMBED_OBJ_DECLARE(NAME) \
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extern struct bpf_embed_data NAME##_embed; \
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extern char NAME##_data[]; \
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extern char NAME##_data_end[];
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#define __BPF_EMBED_OBJ(NAME, PATH, SZ, ASM_TYPE) \
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asm ( \
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" .pushsection \".rodata\", \"a\", @progbits \n" \
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" .global "#NAME"_data \n" \
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#NAME"_data: \n" \
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" .incbin \"" PATH "\" \n" \
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" .global "#NAME"_data_end \n" \
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#NAME"_data_end: \n" \
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" .global "#NAME"_embed \n" \
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" .type "#NAME"_embed, @object \n" \
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" .size "#NAME"_size, "#SZ" \n" \
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" .align 8, \n" \
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#NAME"_embed: \n" \
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" "ASM_TYPE" "#NAME"_data \n" \
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" "ASM_TYPE" "#NAME"_data_end - "#NAME"_data \n" \
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" .popsection \n" \
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); \
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BPF_EMBED_OBJ_DECLARE(NAME)
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#if __SIZEOF_POINTER__ == 4
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#define BPF_EMBED_OBJ(NAME, PATH) __BPF_EMBED_OBJ(NAME, PATH, 8, ".long")
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#else
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#define BPF_EMBED_OBJ(NAME, PATH) __BPF_EMBED_OBJ(NAME, PATH, 16, ".quad")
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#endif
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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