From 2ad97d473db57ab866f0756806bb94515f7f2551 Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Fri, 13 Dec 2019 17:47:09 -0800 Subject: 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 Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191214014710.3449601-4-andriin@fb.com --- tools/bpf/bpftool/gen.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'tools/bpf/bpftool') 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; -- cgit v1.2.3