1 files changed, 136 insertions, 0 deletions

diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c
new file mode 100644
index 000000000000..46c326db4f46
--- /dev/null
+++ b/tools/objtool/objtool.c
@@ -0,0 +1,136 @@
+/*
+ * 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 "builtin.h"
+
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
+
+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;
+}