1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> 4 */ 5 6 #include <stdio.h> 7 #include <stdbool.h> 8 #include <string.h> 9 #include <stdlib.h> 10 #include <unistd.h> 11 #include <subcmd/exec-cmd.h> 12 #include <subcmd/pager.h> 13 #include <linux/kernel.h> 14 15 #include <objtool/builtin.h> 16 #include <objtool/objtool.h> 17 #include <objtool/warn.h> 18 19 static struct objtool_file file; 20 21 struct objtool_file *objtool_open_read(const char *filename) 22 { 23 if (file.elf) { 24 ERROR("won't handle more than one file at a time"); 25 return NULL; 26 } 27 28 file.elf = elf_open_read(filename, O_RDWR); 29 if (!file.elf) 30 return NULL; 31 32 hash_init(file.insn_hash); 33 INIT_LIST_HEAD(&file.retpoline_call_list); 34 INIT_LIST_HEAD(&file.return_thunk_list); 35 INIT_LIST_HEAD(&file.static_call_list); 36 INIT_LIST_HEAD(&file.mcount_loc_list); 37 INIT_LIST_HEAD(&file.endbr_list); 38 INIT_LIST_HEAD(&file.call_list); 39 file.ignore_unreachables = opts.no_unreachable; 40 file.hints = false; 41 42 return &file; 43 } 44 45 int objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func) 46 { 47 if (!opts.noinstr) 48 return 0; 49 50 if (!f->pv_ops) { 51 ERROR("paravirt confusion"); 52 return -1; 53 } 54 55 /* 56 * These functions will be patched into native code, 57 * see paravirt_patch(). 58 */ 59 if (!strcmp(func->name, "_paravirt_nop") || 60 !strcmp(func->name, "_paravirt_ident_64")) 61 return 0; 62 63 /* already added this function */ 64 if (!list_empty(&func->pv_target)) 65 return 0; 66 67 list_add(&func->pv_target, &f->pv_ops[idx].targets); 68 f->pv_ops[idx].clean = false; 69 return 0; 70 } 71 72 char *top_level_dir(const char *file) 73 { 74 ssize_t len, self_len, file_len; 75 char self[PATH_MAX], *str; 76 int i; 77 78 len = readlink("/proc/self/exe", self, sizeof(self) - 1); 79 if (len <= 0) 80 return NULL; 81 self[len] = '\0'; 82 83 for (i = 0; i < 3; i++) { 84 char *s = strrchr(self, '/'); 85 if (!s) 86 return NULL; 87 *s = '\0'; 88 } 89 90 self_len = strlen(self); 91 file_len = strlen(file); 92 93 str = malloc(self_len + file_len + 2); 94 if (!str) 95 return NULL; 96 97 memcpy(str, self, self_len); 98 str[self_len] = '/'; 99 strcpy(str + self_len + 1, file); 100 101 return str; 102 } 103 104 int main(int argc, const char **argv) 105 { 106 static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED"; 107 108 if (init_signal_handler()) 109 return -1; 110 111 /* libsubcmd init */ 112 exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED); 113 pager_init(UNUSED); 114 115 if (argc > 1 && !strcmp(argv[1], "klp")) { 116 argc--; 117 argv++; 118 return cmd_klp(argc, argv); 119 } 120 121 return objtool_run(argc, argv); 122 } 123