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libbpf: Add elf_resolve_pattern_offsets function

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Adding elf_resolve_pattern_offsets function that looks up
offsets for symbols specified by pattern argument.

The 'pattern' argument allows wildcards (*?' supported).

Offsets are returned in allocated array together with its
size and needs to be released by the caller.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230809083440.3209381-13-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa
2023-08-09 10:34:24 +02:00
committed by Andrii Nakryiko
parent 91fd655644
commit c7ef3a169e
3 changed files with 67 additions and 1 deletions
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61
src/elf.c
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@@ -377,3 +377,64 @@ out:
elf_close(&elf_fd);
return err;
}
/*
* Return offsets in @poffsets for symbols specified by @pattern argument.
* On success returns 0 and offsets are returned in allocated @poffsets
* array with the @pctn size, that needs to be released by the caller.
*/
int elf_resolve_pattern_offsets(const char *binary_path, const char *pattern,
unsigned long **poffsets, size_t *pcnt)
{
int sh_types[2] = { SHT_SYMTAB, SHT_DYNSYM };
unsigned long *offsets = NULL;
size_t cap = 0, cnt = 0;
struct elf_fd elf_fd;
int err = 0, i;
err = elf_open(binary_path, &elf_fd);
if (err)
return err;
for (i = 0; i < ARRAY_SIZE(sh_types); i++) {
struct elf_sym_iter iter;
struct elf_sym *sym;
err = elf_sym_iter_new(&iter, elf_fd.elf, binary_path, sh_types[i], STT_FUNC);
if (err == -ENOENT)
continue;
if (err)
goto out;
while ((sym = elf_sym_iter_next(&iter))) {
if (!glob_match(sym->name, pattern))
continue;
err = libbpf_ensure_mem((void **) &offsets, &cap, sizeof(*offsets),
cnt + 1);
if (err)
goto out;
offsets[cnt++] = elf_sym_offset(sym);
}
/* If we found anything in the first symbol section,
* do not search others to avoid duplicates.
*/
if (cnt)
break;
}
if (cnt) {
*poffsets = offsets;
*pcnt = cnt;
} else {
err = -ENOENT;
}
out:
if (err)
free(offsets);
elf_close(&elf_fd);
return err;
}