8fdc2dc3ca
This change adds a --noinstr flag to objtool to allow us to specify that we're processing vmlinux.o without also enabling noinstr validation. This is needed to avoid false positives with LTO when we run objtool on vmlinux.o without CONFIG_DEBUG_ENTRY. Bug: 145210207 Change-Id: I479c72d2733844d2059253035391a0c6e8ad7771 Link: https://lore.kernel.org/lkml/20201013003203.4168817-11-samitolvanen@google.com/ Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
69 lines
2.0 KiB
C
69 lines
2.0 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 "builtin.h"
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#include "objtool.h"
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bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats, validate_dup, vmlinux, mcount, noinstr;
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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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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_END(),
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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 = parse_options(argc, argv, check_options, check_usage, 0);
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if (argc != 1)
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usage_with_options(check_usage, check_options);
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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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