diff options
| author | Andrii Nakryiko <andriin@fb.com> | 2019-12-13 17:47:09 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2019-12-15 16:41:12 -0800 |
| commit | 2ad97d473db57ab866f0756806bb94515f7f2551 (patch) | |
| tree | 6823aff4884341d6aa088f33cc1504375a6d2504 /tools/bpf | |
| parent | 166750bc1dd256b2184b22588fb9fe6d3fbb93ae (diff) | |
bpftool: Generate externs datasec in BPF skeleton
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
Diffstat (limited to 'tools/bpf')
| -rw-r--r-- | tools/bpf/bpftool/gen.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c index 7379dae35dca..a07c80429c7a 100644 --- a/tools/bpf/bpftool/gen.c +++ b/tools/bpf/bpftool/gen.c @@ -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; |