16 #include <elf.h>
28 	/* positional (not necessarily ELF) index in an array of sections */
30 	/* positional (not necessarily ELF) index of a matching section in a final object file */
34 	/* whether section is omitted from the final ELF file */
36 	/* whether section is an ephemeral section, not mapped to an ELF section */
39 	/* ELF info */
52 	Elf *elf;  member
65 	/* mapping of symbol indices from src to dst ELF */
79 	/* ELF symbol index */
103 	/* positional (not necessarily ELF) index in an array of sections */
108 	/* ELF info */
136 	Elf *elf;  member
150 	/* global (including extern) ELF symbols */
189 	if (linker->elf)  in bpf_linker__free()
190 		elf_end(linker->elf);  in bpf_linker__free()
312 	linker->elf = elf_begin(linker->fd, ELF_C_WRITE, NULL);  in init_output_elf()
313 	if (!linker->elf) {  in init_output_elf()
314 		pr_warn_elf("failed to create ELF object");  in init_output_elf()
318 	/* ELF header */  in init_output_elf()
319 	linker->elf_hdr = elf64_newehdr(linker->elf);  in init_output_elf()
321 		pr_warn_elf("failed to create ELF header");  in init_output_elf()
336 	/* initialize strset with an empty string to conform to ELF */  in init_output_elf()
345 	sec->scn = elf_newscn(linker->elf);  in init_output_elf()
384 	sec->scn = elf_newscn(linker->elf);  in init_output_elf()
449 	if (!linker->elf)  in bpf_linker__add_file()
465 	if (obj.elf)  in bpf_linker__add_file()
466 		elf_end(obj.elf);  in bpf_linker__add_file()
566 	obj->elf = elf_begin(obj->fd, ELF_C_READ_MMAP, NULL);  in linker_load_obj_file()
567 	if (!obj->elf) {  in linker_load_obj_file()
569 		pr_warn_elf("failed to parse ELF file '%s'", filename);  in linker_load_obj_file()
573 	/* Sanity check ELF file high-level properties */  in linker_load_obj_file()
574 	ehdr = elf64_getehdr(obj->elf);  in linker_load_obj_file()
577 		pr_warn_elf("failed to get ELF header for %s", filename);  in linker_load_obj_file()
582 		pr_warn_elf("unsupported byte order of ELF file %s", filename);  in linker_load_obj_file()
589 		pr_warn_elf("unsupported kind of ELF file %s", filename);  in linker_load_obj_file()
593 	if (elf_getshdrstrndx(obj->elf, &obj->shstrs_sec_idx)) {  in linker_load_obj_file()
600 	while ((scn = elf_nextscn(obj->elf, scn)) != NULL) {  in linker_load_obj_file()
612 		sec_name = elf_strptr(obj->elf, obj->shstrs_sec_idx, shdr->sh_name);  in linker_load_obj_file()
706 		pr_warn("ELF is missing SYMTAB section in %s\n", obj->filename);  in linker_sanity_check_elf()
710 		pr_warn("ELF is missing section headers STRTAB section in %s\n", obj->filename);  in linker_sanity_check_elf()
718 			pr_warn("ELF section #%zu has empty name in %s\n", sec->sec_idx, obj->filename);  in linker_sanity_check_elf()
726 			pr_warn("ELF section #%zu alignment %llu is non pow-of-2 alignment in %s\n",  in linker_sanity_check_elf()
732 			pr_warn("ELF section #%zu has inconsistent alignment addr=%llu != d=%llu in %s\n",  in linker_sanity_check_elf()
739 			pr_warn("ELF section #%zu has inconsistent section size sh=%llu != d=%llu in %s\n",  in linker_sanity_check_elf()
756 					pr_warn("ELF section #%zu has unexpected size alignment %llu in %s\n",  in linker_sanity_check_elf()
773 			pr_warn("ELF section #%zu (%s) has unrecognized type %zu in %s\n",  in linker_sanity_check_elf()
794 		pr_warn("ELF SYMTAB section #%zu points to missing STRTAB section #%zu in %s\n",  in linker_sanity_check_elf_symtab()
800 		pr_warn("ELF SYMTAB section #%zu points to invalid STRTAB section #%zu in %s\n",  in linker_sanity_check_elf_symtab()
816 				pr_warn("ELF sym #0 is invalid in %s\n", obj->filename);  in linker_sanity_check_elf_symtab()
822 			pr_warn("ELF sym #%d in section #%zu has unsupported symbol binding %d\n",  in linker_sanity_check_elf_symtab()
827 			pr_warn("ELF sym #%d in section #%zu has unsupported symbol visibility %d\n",  in linker_sanity_check_elf_symtab()
834 				pr_warn("ELF sym #%d is invalid extern symbol in %s\n",  in linker_sanity_check_elf_symtab()
842 			pr_warn("ELF sym #%d in section #%zu points to missing section #%zu in %s\n",  in linker_sanity_check_elf_symtab()
869 		pr_warn("ELF relo section #%zu points to invalid SYMTAB section #%zu in %s\n",  in linker_sanity_check_elf_relos()
876 		pr_warn("ELF relo section #%zu points to missing section #%zu in %s\n",  in linker_sanity_check_elf_relos()
885 		pr_warn("ELF relo section #%zu name has invalid name in %s\n",  in linker_sanity_check_elf_relos()
896 		pr_warn("ELF relo section #%zu points to invalid section #%zu in %s\n",  in linker_sanity_check_elf_relos()
911 			pr_warn("ELF relo #%d in section #%zu has unexpected type %zu in %s\n",  in linker_sanity_check_elf_relos()
917 			pr_warn("ELF relo #%d in section #%zu points to invalid symbol #%zu in %s\n",  in linker_sanity_check_elf_relos()
924 				pr_warn("ELF relo #%d in section #%zu points to missing symbol #%zu in %s\n",  in linker_sanity_check_elf_relos()
1026 	scn = elf_newscn(linker->elf);  in init_sec()
1119 	/* Ephemeral source section doesn't contribute anything to ELF  in extend_sec()
1128 	 * first non-ephemeral entity appears. In such case, we add ELF  in extend_sec()
1226 				pr_warn("ELF sections %s are incompatible\n", src_sec->sec_name);  in linker_append_sec_data()
1273 		sym_name = elf_strptr(obj->elf, str_sec_idx, sym->st_name);  in linker_append_elf_syms()
1903 				pr_warn("failed to find matching ELF sec '%s'\n", sec_name);  in linker_append_elf_sym()
1951 		 * ensured by ELF symbol sanity checks above.  in linker_append_elf_sym()
2027 		 * sec_idx (as they don't have corresponding ELF section), but  in linker_append_elf_sym()
2150 		name = elf_strptr(obj->elf, str_sec_idx, sym->st_name);  in find_sym_by_name()
2189 			 * in ELF, e.g., .kconfig, .ksyms, .extern, which are used  in linker_fixup_btf()
2220 			sec->sec_idx = 0; /* will match UNDEF shndx in ELF */  in linker_fixup_btf()
2223 		/* remember ELF section and its BTF type ID match */  in linker_fixup_btf()
2601 	if (!linker->elf)  in bpf_linker__finalize()
2634 	/* Finalize ELF layout */  in bpf_linker__finalize()
2635 	if (elf_update(linker->elf, ELF_C_NULL) < 0) {  in bpf_linker__finalize()
2637 		pr_warn_elf("failed to finalize ELF layout");  in bpf_linker__finalize()
2641 	/* Write out final ELF contents */  in bpf_linker__finalize()
2642 	if (elf_update(linker->elf, ELF_C_WRITE) < 0) {  in bpf_linker__finalize()
2644 		pr_warn_elf("failed to write ELF contents");  in bpf_linker__finalize()
2648 	elf_end(linker->elf);  in bpf_linker__finalize()
2651 	linker->elf = NULL;  in bpf_linker__finalize()
2669 	scn = elf_newscn(linker->elf);  in emit_elf_data_sec()
2750 		pr_warn("failed to write out .BTF ELF section: %d\n", err);  in finalize_btf()
2762 			pr_warn("failed to write out .BTF.ext ELF section: %d\n", err);  in finalize_btf()