tools/objtool/orc_dump.c

Source file repositories/reference/linux-study-clean/tools/objtool/orc_dump.c

File Facts

System
Linux kernel
Corpus path
tools/objtool/orc_dump.c
Extension
.c
Size
3201 bytes
Lines
157
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!scn) {
			ERROR_ELF("elf_getscn");
			return -1;
		}

		if (!gelf_getshdr(scn, &sh)) {
			ERROR_ELF("gelf_getshdr");
			return -1;
		}

		name = elf_strptr(elf, shstrtab_idx, sh.sh_name);
		if (!name) {
			ERROR_ELF("elf_strptr");
			return -1;
		}

		data = elf_getdata(scn, NULL);
		if (!data) {
			ERROR_ELF("elf_getdata");
			return -1;
		}

		if (!strcmp(name, ".symtab")) {
			symtab = data;
		} else if (!strcmp(name, ".strtab")) {
			strtab_idx = i;
		} else if (!strcmp(name, ".orc_unwind")) {
			orc = data->d_buf;
			orc_size = sh.sh_size;
		} else if (!strcmp(name, ".orc_unwind_ip")) {
			orc_ip = data->d_buf;
			orc_ip_addr = sh.sh_addr;
		} else if (!strcmp(name, ".rela.orc_unwind_ip")) {
			rela_orc_ip = data;
		}
	}

	if (!symtab || !strtab_idx || !orc || !orc_ip)
		return 0;

	if (orc_size % sizeof(*orc) != 0) {
		ERROR("bad .orc_unwind section size");
		return -1;
	}

	nr_entries = orc_size / sizeof(*orc);
	for (i = 0; i < nr_entries; i++) {
		if (rela_orc_ip) {
			if (!gelf_getrela(rela_orc_ip, i, &rela)) {
				ERROR_ELF("gelf_getrela");
				return -1;
			}

			if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) {
				ERROR_ELF("gelf_getsym");
				return -1;
			}

			if (GELF_ST_TYPE(sym.st_info) == STT_SECTION) {
				scn = elf_getscn(elf, sym.st_shndx);
				if (!scn) {
					ERROR_ELF("elf_getscn");
					return -1;
				}

				if (!gelf_getshdr(scn, &sh)) {
					ERROR_ELF("gelf_getshdr");
					return -1;
				}

				name = elf_strptr(elf, shstrtab_idx, sh.sh_name);
				if (!name) {
					ERROR_ELF("elf_strptr");
					return -1;
				}
			} else {
				name = elf_strptr(elf, strtab_idx, sym.st_name);
				if (!name) {
					ERROR_ELF("elf_strptr");
					return -1;
				}
			}

			printf("%s+%llx:", name, (unsigned long long)rela.r_addend);

		} else {
			printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i]));
		}

		orc_print_dump(&dummy_elf, orc, i);

Annotation

Implementation Notes