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authorMatt Smith <alastorze@fb.com>2021-09-01 12:44:38 -0700
committerAndrii Nakryiko <andrii@kernel.org>2021-09-07 17:41:23 -0700
commita6cc6b34b93e3660149a7cb947be98a9b239ffce (patch)
tree4bfc19f41b9e95c4273493d25318e714f9cbe2c9 /tools/bpf
parent08a6f22ef6f843d0ea7252087787b5ab04610bec (diff)
bpftool: Provide a helper method for accessing skeleton's embedded ELF data
This adds a skeleton method X__elf_bytes() which returns the binary data of the compiled and embedded BPF object file. It additionally sets the size of the return data to the provided size_t pointer argument. The assignment to s->data is cast to void * to ensure no warning is issued if compiled with a previous version of libbpf where the bpf_object_skeleton field is void * instead of const void * Signed-off-by: Matt Smith <alastorze@fb.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210901194439.3853238-3-alastorze@fb.com
Diffstat (limited to 'tools/bpf')
-rw-r--r--tools/bpf/bpftool/gen.c31
1 files changed, 19 insertions, 12 deletions
diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index d40d92bbf0e4..e3ec47a6a612 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -238,8 +238,8 @@ static void codegen(const char *template, ...)
} else if (c == '\n') {
break;
} else {
- p_err("unrecognized character at pos %td in template '%s'",
- src - template - 1, template);
+ p_err("unrecognized character at pos %td in template '%s': '%c'",
+ src - template - 1, template, c);
free(s);
exit(-1);
}
@@ -406,7 +406,7 @@ static void codegen_destroy(struct bpf_object *obj, const char *obj_name)
}
bpf_object__for_each_map(map, obj) {
- const char * ident;
+ const char *ident;
ident = get_map_ident(map);
if (!ident)
@@ -862,6 +862,8 @@ static int do_skeleton(int argc, char **argv)
codegen("\
\n\
\n\
+ static inline const void *%1$s__elf_bytes(size_t *sz); \n\
+ \n\
static inline int \n\
%1$s__create_skeleton(struct %1$s *obj) \n\
{ \n\
@@ -943,10 +945,20 @@ static int do_skeleton(int argc, char **argv)
codegen("\
\n\
\n\
- s->data_sz = %d; \n\
- s->data = (void *)\"\\ \n\
- ",
- file_sz);
+ s->data = (void *)%2$s__elf_bytes(&s->data_sz); \n\
+ \n\
+ return 0; \n\
+ err: \n\
+ bpf_object__destroy_skeleton(s); \n\
+ return -ENOMEM; \n\
+ } \n\
+ \n\
+ static inline const void *%2$s__elf_bytes(size_t *sz) \n\
+ { \n\
+ *sz = %1$d; \n\
+ return (const void *)\"\\ \n\
+ "
+ , file_sz, obj_name);
/* embed contents of BPF object file */
print_hex(obj_data, file_sz);
@@ -954,11 +966,6 @@ static int do_skeleton(int argc, char **argv)
codegen("\
\n\
\"; \n\
- \n\
- return 0; \n\
- err: \n\
- bpf_object__destroy_skeleton(s); \n\
- return -ENOMEM; \n\
} \n\
\n\
#endif /* %s */ \n\