// SPDX-License-Identifier: GPL-2.0-or-later

  /*

   * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>

   */
  
  /*
   * objtool check:
   *
   * This command 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 <subcmd/parse-options.h>

  #include <string.h>

  #include "builtin.h"

  #include "objtool.h"

  bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats, validate_dup, vmlinux, mcount, noinstr;

  static const char * const check_usage[] = {

  	"objtool check [<options>] file.o",
  	NULL,
  };

  const struct option check_options[] = {

  	OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
  	OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),

  	OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),

  	OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),

  	OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),

  	OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),

  	OPT_BOOLEAN('s', "stats", &stats, "print statistics"),

  	OPT_BOOLEAN('d', "duplicate", &validate_dup, "duplicate validation for vmlinux.o"),

  	OPT_BOOLEAN('n', "noinstr", &noinstr, "noinstr validation for vmlinux.o"),

  	OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),

  	OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),

  	OPT_END(),
  };

  int cmd_check(int argc, const char **argv)
  {

  	const char *objname;

  	struct objtool_file *file;

  	int ret;

  	argc = parse_options(argc, argv, check_options, check_usage, 0);

  
  	if (argc != 1)

  		usage_with_options(check_usage, check_options);

  
  	objname = argv[0];

  	file = objtool_open_read(objname);
  	if (!file)
  		return 1;

  	ret = check(file);
  	if (ret)
  		return ret;
  
  	if (file->elf->changed)
  		return elf_write(file->elf);
  
  	return 0;

  }