diff options
Diffstat (limited to 'tools/objtool/objtool.c')
| -rw-r--r-- | tools/objtool/objtool.c | 221 |
1 files changed, 50 insertions, 171 deletions
diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c index bdf699f6552b..1c3622117c33 100644 --- a/tools/objtool/objtool.c +++ b/tools/objtool/objtool.c @@ -3,16 +3,6 @@ * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> */ -/* - * objtool: - * - * The 'check' subcmd analyzes every .o file and ensures the validity of its - * stack trace metadata. It enforces a set of rules on asm code and C inline - * assembly code so that stack traces can be reliable. - * - * For more information, see tools/objtool/Documentation/stack-validation.txt. - */ - #include <stdio.h> #include <stdbool.h> #include <string.h> @@ -26,123 +16,43 @@ #include <objtool/objtool.h> #include <objtool/warn.h> -struct cmd_struct { - const char *name; - int (*fn)(int, const char **); - const char *help; -}; - -static const char objtool_usage_string[] = - "objtool COMMAND [ARGS]"; +bool debug; +int indent; -static struct cmd_struct objtool_cmds[] = { - {"check", cmd_check, "Perform stack metadata validation on an object file" }, - {"orc", cmd_orc, "Generate in-place ORC unwind tables for an object file" }, -}; - -bool help; - -const char *objname; static struct objtool_file file; -static bool objtool_create_backup(const char *_objname) -{ - int len = strlen(_objname); - char *buf, *base, *name = malloc(len+6); - int s, d, l, t; - - if (!name) { - perror("failed backup name malloc"); - return false; - } - - strcpy(name, _objname); - strcpy(name + len, ".orig"); - - d = open(name, O_CREAT|O_WRONLY|O_TRUNC, 0644); - if (d < 0) { - perror("failed to create backup file"); - return false; - } - - s = open(_objname, O_RDONLY); - if (s < 0) { - perror("failed to open orig file"); - return false; - } - - buf = malloc(4096); - if (!buf) { - perror("failed backup data malloc"); - return false; - } - - while ((l = read(s, buf, 4096)) > 0) { - base = buf; - do { - t = write(d, base, l); - if (t < 0) { - perror("failed backup write"); - return false; - } - base += t; - l -= t; - } while (l); - } - - if (l < 0) { - perror("failed backup read"); - return false; - } - - free(name); - free(buf); - close(d); - close(s); - - return true; -} - -struct objtool_file *objtool_open_read(const char *_objname) +struct objtool_file *objtool_open_read(const char *filename) { - if (objname) { - if (strcmp(objname, _objname)) { - WARN("won't handle more than one file at a time"); - return NULL; - } - return &file; + if (file.elf) { + ERROR("won't handle more than one file at a time"); + return NULL; } - objname = _objname; - file.elf = elf_open_read(objname, O_RDWR); + file.elf = elf_open_read(filename, O_RDWR); if (!file.elf) return NULL; - if (backup && !objtool_create_backup(objname)) { - WARN("can't create backup file"); - return NULL; - } - - INIT_LIST_HEAD(&file.insn_list); hash_init(file.insn_hash); INIT_LIST_HEAD(&file.retpoline_call_list); + INIT_LIST_HEAD(&file.return_thunk_list); INIT_LIST_HEAD(&file.static_call_list); INIT_LIST_HEAD(&file.mcount_loc_list); - file.c_file = !vmlinux && find_section_by_name(file.elf, ".comment"); - file.ignore_unreachables = no_unreachable; + INIT_LIST_HEAD(&file.endbr_list); + INIT_LIST_HEAD(&file.call_list); + file.ignore_unreachables = opts.no_unreachable; file.hints = false; return &file; } -void objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func) +int objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func) { - if (!noinstr) - return; + if (!opts.noinstr) + return 0; if (!f->pv_ops) { - WARN("paravirt confusion"); - return; + ERROR("paravirt confusion"); + return -1; } /* @@ -151,96 +61,65 @@ void objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func) */ if (!strcmp(func->name, "_paravirt_nop") || !strcmp(func->name, "_paravirt_ident_64")) - return; + return 0; /* already added this function */ if (!list_empty(&func->pv_target)) - return; + return 0; list_add(&func->pv_target, &f->pv_ops[idx].targets); f->pv_ops[idx].clean = false; + return 0; } -static void cmd_usage(void) +char *top_level_dir(const char *file) { - unsigned int i, longest = 0; - - printf("\n usage: %s\n\n", objtool_usage_string); - - for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) { - if (longest < strlen(objtool_cmds[i].name)) - longest = strlen(objtool_cmds[i].name); - } + ssize_t len, self_len, file_len; + char self[PATH_MAX], *str; + int i; - puts(" Commands:"); - for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) { - printf(" %-*s ", longest, objtool_cmds[i].name); - puts(objtool_cmds[i].help); - } - - printf("\n"); - - if (!help) - exit(129); - exit(0); -} + len = readlink("/proc/self/exe", self, sizeof(self) - 1); + if (len <= 0) + return NULL; + self[len] = '\0'; -static void handle_options(int *argc, const char ***argv) -{ - while (*argc > 0) { - const char *cmd = (*argv)[0]; - - if (cmd[0] != '-') - break; - - if (!strcmp(cmd, "--help") || !strcmp(cmd, "-h")) { - help = true; - break; - } else { - fprintf(stderr, "Unknown option: %s\n", cmd); - cmd_usage(); - } - - (*argv)++; - (*argc)--; + for (i = 0; i < 3; i++) { + char *s = strrchr(self, '/'); + if (!s) + return NULL; + *s = '\0'; } -} - -static void handle_internal_command(int argc, const char **argv) -{ - const char *cmd = argv[0]; - unsigned int i, ret; - - for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) { - struct cmd_struct *p = objtool_cmds+i; - if (strcmp(p->name, cmd)) - continue; + self_len = strlen(self); + file_len = strlen(file); - ret = p->fn(argc, argv); + str = malloc(self_len + file_len + 2); + if (!str) + return NULL; - exit(ret); - } + memcpy(str, self, self_len); + str[self_len] = '/'; + strcpy(str + self_len + 1, file); - cmd_usage(); + return str; } int main(int argc, const char **argv) { static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED"; + if (init_signal_handler()) + return -1; + /* libsubcmd init */ exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED); pager_init(UNUSED); - argv++; - argc--; - handle_options(&argc, &argv); - - if (!argc || help) - cmd_usage(); - - handle_internal_command(argc, argv); + if (argc > 1 && !strcmp(argv[1], "klp")) { + argc--; + argv++; + return cmd_klp(argc, argv); + } - return 0; + return objtool_run(argc, argv); } |