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900b4df347
Teach objtool to parse options from the OBJTOOL_ARGS environment
variable.
This enables things like:
$ OBJTOOL_ARGS="--backup" make O=defconfig-build/ kernel/ponies.o
to obtain both defconfig-build/kernel/ponies.o{,.orig} and easily
inspect what objtool actually did.
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20210226110004.252553847@infradead.org
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
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*/
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/*
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* objtool check:
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*
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* This command analyzes every .o file and ensures the validity of its stack
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* trace metadata. It enforces a set of rules on asm code and C inline
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* assembly code so that stack traces can be reliable.
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*
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* For more information, see tools/objtool/Documentation/stack-validation.txt.
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*/
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#include <subcmd/parse-options.h>
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#include <string.h>
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#include <stdlib.h>
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#include <objtool/builtin.h>
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#include <objtool/objtool.h>
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bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
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validate_dup, vmlinux, mcount, noinstr, backup;
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static const char * const check_usage[] = {
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"objtool check [<options>] file.o",
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NULL,
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};
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static const char * const env_usage[] = {
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"OBJTOOL_ARGS=\"<options>\"",
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NULL,
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};
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const struct option check_options[] = {
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OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
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OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
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OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
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OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),
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OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
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OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
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OPT_BOOLEAN('s', "stats", &stats, "print statistics"),
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OPT_BOOLEAN('d', "duplicate", &validate_dup, "duplicate validation for vmlinux.o"),
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OPT_BOOLEAN('n', "noinstr", &noinstr, "noinstr validation for vmlinux.o"),
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OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
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OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),
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OPT_BOOLEAN('B', "backup", &backup, "create .orig files before modification"),
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OPT_END(),
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};
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int cmd_parse_options(int argc, const char **argv, const char * const usage[])
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{
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const char *envv[16] = { };
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char *env;
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int envc;
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env = getenv("OBJTOOL_ARGS");
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if (env) {
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envv[0] = "OBJTOOL_ARGS";
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for (envc = 1; envc < ARRAY_SIZE(envv); ) {
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envv[envc++] = env;
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env = strchr(env, ' ');
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if (!env)
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break;
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*env = '\0';
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env++;
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}
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parse_options(envc, envv, check_options, env_usage, 0);
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}
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argc = parse_options(argc, argv, check_options, usage, 0);
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if (argc != 1)
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usage_with_options(usage, check_options);
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return argc;
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}
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int cmd_check(int argc, const char **argv)
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{
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const char *objname;
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struct objtool_file *file;
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int ret;
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argc = cmd_parse_options(argc, argv, check_usage);
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objname = argv[0];
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file = objtool_open_read(objname);
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if (!file)
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return 1;
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ret = check(file);
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if (ret)
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return ret;
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if (file->elf->changed)
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return elf_write(file->elf);
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return 0;
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}
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