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 bool help;
20
21 static struct objtool_file file;
22
objtool_open_read(const char * filename)23 struct objtool_file *objtool_open_read(const char *filename)
24 {
25 if (file.elf) {
26 ERROR("won't handle more than one file at a time");
27 return NULL;
28 }
29
30 file.elf = elf_open_read(filename, O_RDWR);
31 if (!file.elf)
32 return NULL;
33
34 hash_init(file.insn_hash);
35 INIT_LIST_HEAD(&file.retpoline_call_list);
36 INIT_LIST_HEAD(&file.return_thunk_list);
37 INIT_LIST_HEAD(&file.static_call_list);
38 INIT_LIST_HEAD(&file.mcount_loc_list);
39 INIT_LIST_HEAD(&file.endbr_list);
40 INIT_LIST_HEAD(&file.call_list);
41 file.ignore_unreachables = opts.no_unreachable;
42 file.hints = false;
43
44 return &file;
45 }
46
objtool_pv_add(struct objtool_file * f,int idx,struct symbol * func)47 int objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func)
48 {
49 if (!opts.noinstr)
50 return 0;
51
52 if (!f->pv_ops) {
53 ERROR("paravirt confusion");
54 return -1;
55 }
56
57 /*
58 * These functions will be patched into native code,
59 * see paravirt_patch().
60 */
61 if (!strcmp(func->name, "_paravirt_nop") ||
62 !strcmp(func->name, "_paravirt_ident_64"))
63 return 0;
64
65 /* already added this function */
66 if (!list_empty(&func->pv_target))
67 return 0;
68
69 list_add(&func->pv_target, &f->pv_ops[idx].targets);
70 f->pv_ops[idx].clean = false;
71 return 0;
72 }
73
main(int argc,const char ** argv)74 int main(int argc, const char **argv)
75 {
76 static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED";
77
78 /* libsubcmd init */
79 exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED);
80 pager_init(UNUSED);
81
82 return objtool_run(argc, argv);
83 }
84