Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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
19bool debug;
20int indent;
21
22static struct objtool_file file;
23
24struct objtool_file *objtool_open_read(const char *filename)
25{
26 if (file.elf) {
27 ERROR("won't handle more than one file at a time");
28 return NULL;
29 }
30
31 file.elf = elf_open_read(filename, O_RDWR);
32 if (!file.elf)
33 return NULL;
34
35 hash_init(file.insn_hash);
36 INIT_LIST_HEAD(&file.retpoline_call_list);
37 INIT_LIST_HEAD(&file.return_thunk_list);
38 INIT_LIST_HEAD(&file.static_call_list);
39 INIT_LIST_HEAD(&file.mcount_loc_list);
40 INIT_LIST_HEAD(&file.endbr_list);
41 INIT_LIST_HEAD(&file.call_list);
42 file.ignore_unreachables = opts.no_unreachable;
43 file.hints = false;
44
45 return &file;
46}
47
48int objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func)
49{
50 if (!opts.noinstr)
51 return 0;
52
53 if (!f->pv_ops) {
54 ERROR("paravirt confusion");
55 return -1;
56 }
57
58 /*
59 * These functions will be patched into native code,
60 * see paravirt_patch().
61 */
62 if (!strcmp(func->name, "_paravirt_nop") ||
63 !strcmp(func->name, "_paravirt_ident_64"))
64 return 0;
65
66 /* already added this function */
67 if (!list_empty(&func->pv_target))
68 return 0;
69
70 list_add(&func->pv_target, &f->pv_ops[idx].targets);
71 f->pv_ops[idx].clean = false;
72 return 0;
73}
74
75char *top_level_dir(const char *file)
76{
77 ssize_t len, self_len, file_len;
78 char self[PATH_MAX], *str;
79 int i;
80
81 len = readlink("/proc/self/exe", self, sizeof(self) - 1);
82 if (len <= 0)
83 return NULL;
84 self[len] = '\0';
85
86 for (i = 0; i < 3; i++) {
87 char *s = strrchr(self, '/');
88 if (!s)
89 return NULL;
90 *s = '\0';
91 }
92
93 self_len = strlen(self);
94 file_len = strlen(file);
95
96 str = malloc(self_len + file_len + 2);
97 if (!str)
98 return NULL;
99
100 memcpy(str, self, self_len);
101 str[self_len] = '/';
102 strcpy(str + self_len + 1, file);
103
104 return str;
105}
106
107int main(int argc, const char **argv)
108{
109 static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED";
110
111 if (init_signal_handler())
112 return -1;
113
114 /* libsubcmd init */
115 exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED);
116 pager_init(UNUSED);
117
118 if (argc > 1 && !strcmp(argv[1], "klp")) {
119 argc--;
120 argv++;
121 return cmd_klp(argc, argv);
122 }
123
124 return objtool_run(argc, argv);
125}