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libelf:support find symbol by symbol name

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Add libelf_findsymbol() to locate a symbol in the ELF symbol table by
name, reusing the existing libelf_findsymtab/libelf_readsym/libelf_symname
helpers, and expose its prototype in include/nuttx/lib/elf.h.

Signed-off-by: anjiahao <anjiahao@xiaomi.com>
This commit is contained in:
anjiahao 2025-03-07 17:15:30 +08:00 • committed by Alan C. Assis
parent d89019aa78
commit c8b71df614
2 changed files with 95 additions and 0 deletions
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75
libs/libc/elf/elf_symbols.c
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@ -640,3 +640,78 @@ void libelf_freesymtab(FAR struct module_s *modp)
lib_free((FAR void *)symbol);
}
}
/****************************************************************************
* Name: libelf_findsymbol
*
* Description:
* Locate a symbol in the ELF symbol table by its name.
*
* Input Parameters:
* loadinfo - Load state information containing the symbol table
* name - The name of the symbol to search for
* sym - Pointer to store the located symbol's table entry
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int libelf_findsymbol(FAR struct mod_loadinfo_s *loadinfo,
FAR const char *name, FAR Elf_Sym *sym)
{
size_t num;
int ret;
int i;
if (loadinfo == NULL || name == NULL)
{
return -EINVAL;
}
if (loadinfo->symtabidx == 0)
{
ret = libelf_findsymtab(loadinfo);
if (ret < 0)
{
berr("ERROR: Failed to find symbol table\n");
return ret;
}
}
/* Loop through all symbols in the symbol table */
num = loadinfo->shdr[loadinfo->symtabidx].sh_size / sizeof(Elf_Sym);
for (i = 0; i < num; i++)
{
/* Read the symbol entry */
ret = libelf_readsym(loadinfo, i, sym,
&loadinfo->shdr[loadinfo->symtabidx]);
if (ret)
{
berr("ERROR: Failed to read symbol entry\n");
return ret;
}
/* Get the symbol name */
ret = libelf_symname(loadinfo, sym,
loadinfo->shdr[loadinfo->strtabidx].sh_offset);
if (ret < 0 && ret != -ESRCH)
{
berr("ERROR: Failed to get symbol name\n");
return ret;
}
/* Compare the symbol name with the given name */
if (strcmp((FAR const char *)loadinfo->iobuffer, name) == 0)
{
return ret;
}
}
return -ENOENT;
}