Function find_elf_code

dpdk/lib/bpf/bpf_load_elf.c:134–178

* helper function, find executable section by name. */

 * helper function, find executable section by name.
 */
static int
find_elf_code(Elf *elf, const char *section, Elf_Data **psd, size_t *pidx)
{
	Elf_Scn *sc;
	const Elf64_Ehdr *eh;
	const Elf64_Shdr *sh;
	Elf_Data *sd;
	const char *sn;
	int32_t rc;

	eh = elf64_getehdr(elf);
	if (eh == NULL) {
		rc = elf_errno();
		RTE_BPF_LOG(ERR, "%s(%p, %s) error code: %d(%s)\n",
			__func__, elf, section, rc, elf_errmsg(rc));
		return -EINVAL;
	}

	if (check_elf_header(eh) != 0)
		return -EINVAL;

	/* find given section by name */
	for (sc = elf_nextscn(elf, NULL); sc != NULL;
			sc = elf_nextscn(elf, sc)) {
		sh = elf64_getshdr(sc);
		sn = elf_strptr(elf, eh->e_shstrndx, sh->sh_name);
		if (sn != NULL && strcmp(section, sn) == 0 &&
				sh->sh_type == SHT_PROGBITS &&
				sh->sh_flags == (SHF_ALLOC | SHF_EXECINSTR))
			break;
	}

	sd = elf_getdata(sc, NULL);
	if (sd == NULL || sd->d_size == 0 ||
			sd->d_size % sizeof(struct ebpf_insn) != 0) {
		rc = elf_errno();
		RTE_BPF_LOG(ERR, "%s(%p, %s) error code: %d(%s)\n",
			__func__, elf, section, rc, elf_errmsg(rc));
		return -EINVAL;
	}

	*psd = sd;
	*pidx = elf_ndxscn(sc);
	return 0;
}

/*
 * helper function to process data from relocation table.