1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
9 * This command analyzes every .o file and ensures the validity of its stack
10 * trace metadata. It enforces a set of rules on asm code and C inline
11 * assembly code so that stack traces can be reliable.
13 * For more information, see tools/objtool/Documentation/stack-validation.txt.
16 #include <subcmd/parse-options.h>
19 #include <objtool/builtin.h>
20 #include <objtool/objtool.h>
22 bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
23 validate_dup, vmlinux, mcount, noinstr, backup, sls;
25 static const char * const check_usage[] = {
26 "objtool check [<options>] file.o",
30 static const char * const env_usage[] = {
31 "OBJTOOL_ARGS=\"<options>\"",
35 const struct option check_options[] = {
36 OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
37 OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
38 OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
39 OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),
40 OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
41 OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
42 OPT_BOOLEAN('s', "stats", &stats, "print statistics"),
43 OPT_BOOLEAN('d', "duplicate", &validate_dup, "duplicate validation for vmlinux.o"),
44 OPT_BOOLEAN('n', "noinstr", &noinstr, "noinstr validation for vmlinux.o"),
45 OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
46 OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),
47 OPT_BOOLEAN('B', "backup", &backup, "create .orig files before modification"),
48 OPT_BOOLEAN('S', "sls", &sls, "validate straight-line-speculation"),
52 int cmd_parse_options(int argc, const char **argv, const char * const usage[])
54 const char *envv[16] = { };
58 env = getenv("OBJTOOL_ARGS");
60 envv[0] = "OBJTOOL_ARGS";
61 for (envc = 1; envc < ARRAY_SIZE(envv); ) {
63 env = strchr(env, ' ');
70 parse_options(envc, envv, check_options, env_usage, 0);
73 argc = parse_options(argc, argv, check_options, usage, 0);
75 usage_with_options(usage, check_options);
79 int cmd_check(int argc, const char **argv)
82 struct objtool_file *file;
85 argc = cmd_parse_options(argc, argv, check_usage);
88 file = objtool_open_read(objname);
96 if (file->elf->changed)
97 return elf_write(file->elf);