20 #include <elf.h>
33 	/* positional (not necessarily ELF) index in an array of sections */
35 	/* positional (not necessarily ELF) index of a matching section in a final object file */
39 	/* whether section is omitted from the final ELF file */
41 	/* whether section is an ephemeral section, not mapped to an ELF section */
44 	/* ELF info */
57 	Elf *elf;  member
70 	/* mapping of symbol indices from src to dst ELF */
84 	/* ELF symbol index */
108 	/* positional (not necessarily ELF) index in an array of sections */
113 	/* ELF info */
141 	Elf *elf;  member
156 	/* global (including extern) ELF symbols */
199 	if (linker->elf)  in bpf_linker__free()
200 		elf_end(linker->elf);  in bpf_linker__free()
365 	linker->elf = elf_begin(linker->fd, ELF_C_WRITE, NULL);  in init_output_elf()
366 	if (!linker->elf) {  in init_output_elf()
367 		pr_warn_elf("failed to create ELF object");  in init_output_elf()
371 	/* ELF header */  in init_output_elf()
372 	linker->elf_hdr = elf64_newehdr(linker->elf);  in init_output_elf()
374 		pr_warn_elf("failed to create ELF header");  in init_output_elf()
380 	/* Set unknown ELF endianness, assign later from input files */  in init_output_elf()
384 	/* initialize strset with an empty string to conform to ELF */  in init_output_elf()
393 	sec->scn = elf_newscn(linker->elf);  in init_output_elf()
432 	sec->scn = elf_newscn(linker->elf);  in init_output_elf()
512 	if (obj.elf)  in bpf_linker_add_file()
513 		elf_end(obj.elf);  in bpf_linker_add_file()
526 	if (!linker->elf)  in bpf_linker__add_file()
550 	if (!linker->elf)  in bpf_linker__add_fd()
570 	if (!linker->elf)  in bpf_linker__add_buf()
685 	obj->elf = elf_begin(obj->fd, ELF_C_READ_MMAP, NULL);  in linker_load_obj_file()
686 	if (!obj->elf) {  in linker_load_obj_file()
687 		pr_warn_elf("failed to parse ELF file '%s'", obj->filename);  in linker_load_obj_file()
691 	/* Sanity check ELF file high-level properties */  in linker_load_obj_file()
692 	ehdr = elf64_getehdr(obj->elf);  in linker_load_obj_file()
694 		pr_warn_elf("failed to get ELF header for %s", obj->filename);  in linker_load_obj_file()
702 		pr_warn("unknown byte order of ELF file %s\n", obj->filename);  in linker_load_obj_file()
712 		pr_warn("byte order mismatch with ELF file %s\n", obj->filename);  in linker_load_obj_file()
720 		pr_warn_elf("unsupported kind of ELF file %s", obj->filename);  in linker_load_obj_file()
724 	if (elf_getshdrstrndx(obj->elf, &obj->shstrs_sec_idx)) {  in linker_load_obj_file()
730 	while ((scn = elf_nextscn(obj->elf, scn)) != NULL) {  in linker_load_obj_file()
741 		sec_name = elf_strptr(obj->elf, obj->shstrs_sec_idx, shdr->sh_name);  in linker_load_obj_file()
835 		pr_warn("ELF is missing SYMTAB section in %s\n", obj->filename);  in linker_sanity_check_elf()
839 		pr_warn("ELF is missing section headers STRTAB section in %s\n", obj->filename);  in linker_sanity_check_elf()
847 			pr_warn("ELF section #%zu has empty name in %s\n", sec->sec_idx, obj->filename);  in linker_sanity_check_elf()
855 			pr_warn("ELF section #%zu alignment %llu is non pow-of-2 alignment in %s\n",  in linker_sanity_check_elf()
861 			pr_warn("ELF section #%zu has inconsistent alignment addr=%llu != d=%llu in %s\n",  in linker_sanity_check_elf()
868 			pr_warn("ELF section #%zu has inconsistent section size sh=%llu != d=%llu in %s\n",  in linker_sanity_check_elf()
885 					pr_warn("ELF section #%zu has unexpected size alignment %llu in %s\n",  in linker_sanity_check_elf()
902 			pr_warn("ELF section #%zu (%s) has unrecognized type %zu in %s\n",  in linker_sanity_check_elf()
923 		pr_warn("ELF SYMTAB section #%zu points to missing STRTAB section #%zu in %s\n",  in linker_sanity_check_elf_symtab()
929 		pr_warn("ELF SYMTAB section #%zu points to invalid STRTAB section #%zu in %s\n",  in linker_sanity_check_elf_symtab()
945 				pr_warn("ELF sym #0 is invalid in %s\n", obj->filename);  in linker_sanity_check_elf_symtab()
951 			pr_warn("ELF sym #%d in section #%zu has unsupported symbol binding %d\n",  in linker_sanity_check_elf_symtab()
956 			pr_warn("ELF sym #%d in section #%zu has unsupported symbol visibility %d\n",  in linker_sanity_check_elf_symtab()
963 				pr_warn("ELF sym #%d is invalid extern symbol in %s\n",  in linker_sanity_check_elf_symtab()
971 			pr_warn("ELF sym #%d in section #%zu points to missing section #%zu in %s\n",  in linker_sanity_check_elf_symtab()
998 		pr_warn("ELF relo section #%zu points to invalid SYMTAB section #%zu in %s\n",  in linker_sanity_check_elf_relos()
1005 		pr_warn("ELF relo section #%zu points to missing section #%zu in %s\n",  in linker_sanity_check_elf_relos()
1014 		pr_warn("ELF relo section #%zu name has invalid name in %s\n",  in linker_sanity_check_elf_relos()
1025 		pr_warn("ELF relo section #%zu points to invalid section #%zu in %s\n",  in linker_sanity_check_elf_relos()
1040 			pr_warn("ELF relo #%d in section #%zu has unexpected type %zu in %s\n",  in linker_sanity_check_elf_relos()
1046 			pr_warn("ELF relo #%d in section #%zu points to invalid symbol #%zu in %s\n",  in linker_sanity_check_elf_relos()
1053 				pr_warn("ELF relo #%d in section #%zu points to missing symbol #%zu in %s\n",  in linker_sanity_check_elf_relos()
1155 	scn = elf_newscn(linker->elf);  in init_sec()
1266 	/* Ephemeral source section doesn't contribute anything to ELF  in extend_sec()
1275 	 * first non-ephemeral entity appears. In such case, we add ELF  in extend_sec()
1377 				pr_warn("ELF sections %s are incompatible\n", src_sec->sec_name);  in linker_append_sec_data()
1424 		sym_name = elf_strptr(obj->elf, str_sec_idx, sym->st_name);  in linker_append_elf_syms()
2057 				pr_warn("failed to find matching ELF sec '%s'\n", sec_name);  in linker_append_elf_sym()
2105 		 * ensured by ELF symbol sanity checks above.  in linker_append_elf_sym()
2181 		 * sec_idx (as they don't have corresponding ELF section), but  in linker_append_elf_sym()
2304 		name = elf_strptr(obj->elf, str_sec_idx, sym->st_name);  in find_sym_by_name()
2343 			 * in ELF, e.g., .kconfig, .ksyms, .extern, which are used  in linker_fixup_btf()
2374 			sec->sec_idx = 0; /* will match UNDEF shndx in ELF */  in linker_fixup_btf()
2377 		/* remember ELF section and its BTF type ID match */  in linker_fixup_btf()
2759 	if (!linker->elf)  in bpf_linker__finalize()
2796 	/* Finalize ELF layout */  in bpf_linker__finalize()
2797 	if (elf_update(linker->elf, ELF_C_NULL) < 0) {  in bpf_linker__finalize()
2799 		pr_warn_elf("failed to finalize ELF layout");  in bpf_linker__finalize()
2803 	/* Write out final ELF contents */  in bpf_linker__finalize()
2804 	if (elf_update(linker->elf, ELF_C_WRITE) < 0) {  in bpf_linker__finalize()
2806 		pr_warn_elf("failed to write ELF contents");  in bpf_linker__finalize()
2810 	elf_end(linker->elf);  in bpf_linker__finalize()
2811 	linker->elf = NULL;  in bpf_linker__finalize()
2832 	scn = elf_newscn(linker->elf);  in emit_elf_data_sec()
2921 		pr_warn("failed to write out .BTF ELF section: %s\n", errstr(err));  in finalize_btf()
2933 			pr_warn("failed to write out .BTF.ext ELF section: %s\n", errstr(err));  in finalize_btf()