LXR linux/tools/objtool/builtin-orc.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
   4 */
   5
   6/*
   7 * objtool orc:
   8 *
   9 * This command analyzes a .o file and adds .orc_unwind and .orc_unwind_ip
  10 * sections to it, which is used by the in-kernel ORC unwinder.
  11 *
  12 * This command is a superset of "objtool check".
  13 */
  14
  15#include <string.h>
  16#include <objtool/builtin.h>
  17#include <objtool/objtool.h>
  18
  19static const char *orc_usage[] = {
  20        "objtool orc generate [<options>] file.o",
  21        "objtool orc dump file.o",
  22        NULL,
  23};
  24
  25int cmd_orc(int argc, const char **argv)
  26{
  27        const char *objname;
  28
  29        argc--; argv++;
  30        if (argc <= 0)
  31                usage_with_options(orc_usage, check_options);
  32
  33        if (!strncmp(argv[0], "gen", 3)) {
  34                struct objtool_file *file;
  35                int ret;
  36
  37                argc = cmd_parse_options(argc, argv, orc_usage);
  38                objname = argv[0];
  39
  40                file = objtool_open_read(objname);
  41                if (!file)
  42                        return 1;
  43
  44                ret = check(file);
  45                if (ret)
  46                        return ret;
  47
  48                if (list_empty(&file->insn_list))
  49                        return 0;
  50
  51                ret = orc_create(file);
  52                if (ret)
  53                        return ret;
  54
  55                if (!file->elf->changed)
  56                        return 0;
  57
  58                return elf_write(file->elf);
  59        }
  60
  61        if (!strcmp(argv[0], "dump")) {
  62                if (argc != 2)
  63                        usage_with_options(orc_usage, check_options);
  64
  65                objname = argv[1];
  66
  67                return orc_dump(objname);
  68        }
  69
  70        usage_with_options(orc_usage, check_options);
  71
  72        return 0;
  73}
  74