1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> 4 */ 5 6 #include <unistd.h> 7 #include <asm/orc_types.h> 8 #include <objtool/objtool.h> 9 #include <objtool/orc.h> 10 #include <objtool/warn.h> 11 #include <objtool/endianness.h> 12 13 int orc_dump(const char *filename) 14 { 15 int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0; 16 struct orc_entry *orc = NULL; 17 char *name; 18 size_t nr_sections; 19 Elf64_Addr orc_ip_addr = 0; 20 size_t shstrtab_idx, strtab_idx = 0; 21 Elf *elf; 22 Elf_Scn *scn; 23 GElf_Shdr sh; 24 GElf_Rela rela; 25 GElf_Sym sym; 26 Elf_Data *data, *symtab = NULL, *rela_orc_ip = NULL; 27 struct elf dummy_elf = {}; 28 29 elf_version(EV_CURRENT); 30 31 fd = open(filename, O_RDONLY); 32 if (fd == -1) { 33 perror("open"); 34 return -1; 35 } 36 37 elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); 38 if (!elf) { 39 ERROR_ELF("elf_begin"); 40 return -1; 41 } 42 43 if (!elf64_getehdr(elf)) { 44 ERROR_ELF("elf64_getehdr"); 45 return -1; 46 } 47 memcpy(&dummy_elf.ehdr, elf64_getehdr(elf), sizeof(dummy_elf.ehdr)); 48 49 if (elf_getshdrnum(elf, &nr_sections)) { 50 ERROR_ELF("elf_getshdrnum"); 51 return -1; 52 } 53 54 if (elf_getshdrstrndx(elf, &shstrtab_idx)) { 55 ERROR_ELF("elf_getshdrstrndx"); 56 return -1; 57 } 58 59 for (i = 0; i < nr_sections; i++) { 60 scn = elf_getscn(elf, i); 61 if (!scn) { 62 ERROR_ELF("elf_getscn"); 63 return -1; 64 } 65 66 if (!gelf_getshdr(scn, &sh)) { 67 ERROR_ELF("gelf_getshdr"); 68 return -1; 69 } 70 71 name = elf_strptr(elf, shstrtab_idx, sh.sh_name); 72 if (!name) { 73 ERROR_ELF("elf_strptr"); 74 return -1; 75 } 76 77 data = elf_getdata(scn, NULL); 78 if (!data) { 79 ERROR_ELF("elf_getdata"); 80 return -1; 81 } 82 83 if (!strcmp(name, ".symtab")) { 84 symtab = data; 85 } else if (!strcmp(name, ".strtab")) { 86 strtab_idx = i; 87 } else if (!strcmp(name, ".orc_unwind")) { 88 orc = data->d_buf; 89 orc_size = sh.sh_size; 90 } else if (!strcmp(name, ".orc_unwind_ip")) { 91 orc_ip = data->d_buf; 92 orc_ip_addr = sh.sh_addr; 93 } else if (!strcmp(name, ".rela.orc_unwind_ip")) { 94 rela_orc_ip = data; 95 } 96 } 97 98 if (!symtab || !strtab_idx || !orc || !orc_ip) 99 return 0; 100 101 if (orc_size % sizeof(*orc) != 0) { 102 ERROR("bad .orc_unwind section size"); 103 return -1; 104 } 105 106 nr_entries = orc_size / sizeof(*orc); 107 for (i = 0; i < nr_entries; i++) { 108 if (rela_orc_ip) { 109 if (!gelf_getrela(rela_orc_ip, i, &rela)) { 110 ERROR_ELF("gelf_getrela"); 111 return -1; 112 } 113 114 if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) { 115 ERROR_ELF("gelf_getsym"); 116 return -1; 117 } 118 119 if (GELF_ST_TYPE(sym.st_info) == STT_SECTION) { 120 scn = elf_getscn(elf, sym.st_shndx); 121 if (!scn) { 122 ERROR_ELF("elf_getscn"); 123 return -1; 124 } 125 126 if (!gelf_getshdr(scn, &sh)) { 127 ERROR_ELF("gelf_getshdr"); 128 return -1; 129 } 130 131 name = elf_strptr(elf, shstrtab_idx, sh.sh_name); 132 if (!name) { 133 ERROR_ELF("elf_strptr"); 134 return -1; 135 } 136 } else { 137 name = elf_strptr(elf, strtab_idx, sym.st_name); 138 if (!name) { 139 ERROR_ELF("elf_strptr"); 140 return -1; 141 } 142 } 143 144 printf("%s+%llx:", name, (unsigned long long)rela.r_addend); 145 146 } else { 147 printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i])); 148 } 149 150 orc_print_dump(&dummy_elf, orc, i); 151 } 152 153 elf_end(elf); 154 close(fd); 155 156 return 0; 157 } 158