tools/objtool/builtin-orc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2017 Josh Poimboeuf <[email protected]>
   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 "builtin.h"
  17 #include "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 = parse_options(argc, argv, check_options, orc_usage, 0);
  38                 if (argc != 1)
  39                         usage_with_options(orc_usage, check_options);
  40
  41                 objname = argv[0];
  42
  43                 file = objtool_open_read(objname);
  44                 if (!file)
  45                         return 1;
  46
  47                 ret = check(file);
  48                 if (ret)
  49                         return ret;
  50
  51                 if (list_empty(&file->insn_list))
  52                         return 0;
  53
  54                 ret = create_orc(file);
  55                 if (ret)
  56                         return ret;
  57
  58                 ret = create_orc_sections(file);
  59                 if (ret)
  60                         return ret;
  61
  62                 if (!file->elf->changed)
  63                         return 0;
  64
  65                 return elf_write(file->elf);
  66         }
  67
  68         if (!strcmp(argv[0], "dump")) {
  69                 if (argc != 2)
  70                         usage_with_options(orc_usage, check_options);
  71
  72                 objname = argv[1];
  73
  74                 return orc_dump(objname);
  75         }
  76
  77         usage_with_options(orc_usage, check_options);
  78
  79         return 0;
  80 }