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
  19 static const char *orc_usage[] = {
  20         "objtool orc generate [<options>] file.o",
  21         "objtool orc dump file.o",
  22         NULL,
  23 };
  24
  25 int 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 }