Function process_reloc

dpdk/lib/bpf/bpf_load_elf.c:183–227

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

 * helper function to process data from relocation table.
 */
static int
process_reloc(Elf *elf, size_t sym_idx, Elf64_Rel *re, size_t re_sz,
	struct ebpf_insn *ins, size_t ins_sz, const struct rte_bpf_prm *prm)
{
	int32_t rc;
	uint32_t i, n;
	size_t ofs, sym;
	const char *sn;
	const Elf64_Ehdr *eh;
	Elf_Scn *sc;
	const Elf_Data *sd;
	Elf64_Sym *sm;

	eh = elf64_getehdr(elf);

	/* get symtable by section index */
	sc = elf_getscn(elf, sym_idx);
	sd = elf_getdata(sc, NULL);
	if (sd == NULL)
		return -EINVAL;
	sm = sd->d_buf;

	n = re_sz / sizeof(re[0]);
	for (i = 0; i != n; i++) {

		ofs = re[i].r_offset;

		/* retrieve index in the symtable */
		sym = ELF64_R_SYM(re[i].r_info);
		if (sym * sizeof(sm[0]) >= sd->d_size)
			return -EINVAL;

		sn = elf_strptr(elf, eh->e_shstrndx, sm[sym].st_name);

		rc = resolve_xsym(sn, ofs, ins, ins_sz, prm);
		if (rc != 0) {
			RTE_BPF_LOG(ERR,
				"resolve_xsym(%s, %zu) error code: %d\n",
				sn, ofs, rc);
			return rc;
		}
	}

	return 0;
}

/*
 * helper function, find relocation information (if any)