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bpftool: Generate externs datasec in BPF skeleton

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Add support for generation of mmap()-ed read-only view of libbpf-provided
extern variables. As externs are not supposed to be provided by user code
(that's what .data, .bss, and .rodata is for), don't mmap() it initially. Only
after skeleton load is performed, map .extern contents as read-only memory.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191214014710.3449601-4-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2019-12-13 17:47:09 -08:00
committed by Alexei Starovoitov
parent 166750bc1d
commit 2ad97d473d
2 changed files with 9 additions and 5 deletions
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4
tools/bpf/bpftool/gen.c
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@@ -82,6 +82,8 @@ static const char *get_map_ident(const struct bpf_map *map)
return "rodata";
else if (str_has_suffix(name, ".bss"))
return "bss";
else if (str_has_suffix(name, ".extern"))
return "externs"; /* extern is a C keyword */
else
return NULL;
}
@@ -109,6 +111,8 @@ static int codegen_datasec_def(struct bpf_object *obj,
sec_ident = "bss";
else if (strcmp(sec_name, ".rodata") == 0)
sec_ident = "rodata";
else if (strcmp(sec_name, ".extern") == 0)
sec_ident = "externs"; /* extern is a C keyword */
else
return 0;