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Now that objtool knows the states of all registers on the stack for each instruction, it's straightforward to generate debuginfo for an unwinder to use. Instead of generating DWARF, generate a new format called ORC, which is more suitable for an in-kernel unwinder. See Documentation/x86/orc-unwinder.txt for a more detailed description of this new debuginfo format and why it's preferable to DWARF. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/c9b9f01ba6c5ed2bdc9bb0957b78167fdbf9632e.1499786555.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
137 lines
3.0 KiB
C
137 lines
3.0 KiB
C
/*
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* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* objtool:
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*
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* The 'check' subcmd analyzes every .o file and ensures the validity of its
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* stack 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 <stdio.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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#include <subcmd/exec-cmd.h>
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#include <subcmd/pager.h>
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#include <linux/kernel.h>
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#include "builtin.h"
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struct cmd_struct {
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const char *name;
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int (*fn)(int, const char **);
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const char *help;
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};
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static const char objtool_usage_string[] =
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"objtool COMMAND [ARGS]";
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static struct cmd_struct objtool_cmds[] = {
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{"check", cmd_check, "Perform stack metadata validation on an object file" },
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{"orc", cmd_orc, "Generate in-place ORC unwind tables for an object file" },
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};
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bool help;
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static void cmd_usage(void)
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{
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unsigned int i, longest = 0;
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printf("\n usage: %s\n\n", objtool_usage_string);
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for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
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if (longest < strlen(objtool_cmds[i].name))
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longest = strlen(objtool_cmds[i].name);
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}
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puts(" Commands:");
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for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
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printf(" %-*s ", longest, objtool_cmds[i].name);
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puts(objtool_cmds[i].help);
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}
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printf("\n");
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exit(1);
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}
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static void handle_options(int *argc, const char ***argv)
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{
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while (*argc > 0) {
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const char *cmd = (*argv)[0];
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if (cmd[0] != '-')
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break;
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if (!strcmp(cmd, "--help") || !strcmp(cmd, "-h")) {
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help = true;
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break;
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} else {
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fprintf(stderr, "Unknown option: %s\n", cmd);
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fprintf(stderr, "\n Usage: %s\n",
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objtool_usage_string);
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exit(1);
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}
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(*argv)++;
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(*argc)--;
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}
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}
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static void handle_internal_command(int argc, const char **argv)
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{
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const char *cmd = argv[0];
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unsigned int i, ret;
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for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
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struct cmd_struct *p = objtool_cmds+i;
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if (strcmp(p->name, cmd))
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continue;
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ret = p->fn(argc, argv);
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exit(ret);
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}
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cmd_usage();
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}
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int main(int argc, const char **argv)
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{
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static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED";
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/* libsubcmd init */
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exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED);
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pager_init(UNUSED);
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argv++;
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argc--;
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handle_options(&argc, &argv);
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if (!argc || help)
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cmd_usage();
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handle_internal_command(argc, argv);
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return 0;
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}
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