/* * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ /* * objtool: * * The 'check' subcmd analyzes every .o file and ensures the validity of its * stack trace metadata.  It enforces a set of rules on asm code and C inline * assembly code so that stack traces can be reliable. * * For more information, see tools/objtool/Documentation/stack-validation.txt. */ #include <stdio.h>#include <stdbool.h>#include <string.h>#include <stdlib.h>#include <subcmd/exec-cmd.h>#include <subcmd/pager.h>#include <linux/kernel.h> #include "builtin.h" struct cmd_struct {	const char *name;	int (*fn)(int, const char **);	const char *help;}; static const char objtool_usage_string[] =	"objtool [OPTIONS] COMMAND [ARGS]"; static struct cmd_struct objtool_cmds[] = {	{"check",	cmd_check,	"Perform stack metadata validation on an object file" },}; bool help; static void cmd_usage(void){	unsigned int i, longest = 0; 	printf("\n usage: %s\n\n", objtool_usage_string); 	for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {		if (longest < strlen(objtool_cmds[i].name))			longest = strlen(objtool_cmds[i].name);	} 	puts(" Commands:");	for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {		printf("   %-*s   ", longest, objtool_cmds[i].name);		puts(objtool_cmds[i].help);	} 	printf("\n"); 	exit(1);} static void handle_options(int *argc, const char ***argv){	while (*argc > 0) {		const char *cmd = (*argv)[0]; 		if (cmd[0] != '-')			break; 		if (!strcmp(cmd, "--help") || !strcmp(cmd, "-h")) {			help = true;			break;		} else {			fprintf(stderr, "Unknown option: %s\n", cmd);			fprintf(stderr, "\n Usage: %s\n",				objtool_usage_string);			exit(1);		} 		(*argv)++;		(*argc)--;	}} static void handle_internal_command(int argc, const char **argv){	const char *cmd = argv[0];	unsigned int i, ret; 	for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {		struct cmd_struct *p = objtool_cmds+i; 		if (strcmp(p->name, cmd))			continue; 		ret = p->fn(argc, argv); 		exit(ret);	} 	cmd_usage();} int main(int argc, const char **argv){	static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED"; 	/* libsubcmd init */	exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED);	pager_init(UNUSED); 	argv++;	argc--;	handle_options(&argc, &argv); 	if (!argc || help)		cmd_usage(); 	handle_internal_command(argc, argv); 	return 0;}