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llext: add a function for finding ELF sections

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Applications can use custom ELF sections for their own purposes, add
a function for finding them.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
This commit is contained in:
Guennadi Liakhovetski 2023-09-22 16:15:18 +02:00 • committed by Anas Nashif
commit f98b8bb48f
2 changed files with 36 additions and 0 deletions
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9
include/zephyr/llext/llext.h
View file

@ -142,6 +142,15 @@ int llext_call_fn(struct llext *ext, const char *sym_name);
*/
void arch_elf_relocate(elf_rela_t *rel, uintptr_t opaddr, uintptr_t opval);
/**
* @brief Find an ELF section
*
* @param loader Extension loader data and context
* @param search_name Section name to search for
* @retval Section offset or a negative error code
*/
ssize_t llext_find_section(struct llext_loader *loader, const char *search_name);
/**
* @brief Architecture specific function for updating addresses via relocation table
*

27
subsys/llext/llext.c
View file

@ -47,6 +47,33 @@ sys_slist_t *llext_list(void)
return &_llext_list;
}
ssize_t llext_find_section(struct llext_loader *ldr, const char *search_name)
{
elf_shdr_t *shdr;
unsigned int i;
size_t pos;
for (i = 0, pos = ldr->hdr.e_shoff;
i < ldr->hdr.e_shnum;
i++, pos += ldr->hdr.e_shentsize) {
shdr = llext_peek(ldr, pos);
if (!shdr) {
/* The peek() method isn't supported */
return -EOPNOTSUPP;
}
const char *name = llext_peek(ldr,
ldr->sects[LLEXT_SECT_SHSTRTAB].sh_offset +
shdr->sh_name);
if (!strcmp(name, search_name)) {
return shdr->sh_offset;
}
}
return -ENOENT;
}
struct llext *llext_by_name(const char *name)
{
sys_slist_t *mlist = llext_list();