tools/reorder/mapaddrs.cpp

   1 /* ***** BEGIN LICENSE BLOCK *****
   2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   3  *
   4  * The contents of this file are subject to the Mozilla Public License Version
   5  * 1.1 (the "License"); you may not use this file except in compliance with
   6  * the License. You may obtain a copy of the License at
   7  * http://www.mozilla.org/MPL/
   8  *
   9  * Software distributed under the License is distributed on an "AS IS" basis,
  10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  11  * for the specific language governing rights and limitations under the
  12  * License.
  13  *
  14  * The Original Code is ``mapaddrs''
  15  *
  16  * The Initial Developer of the Original Code is Netscape
  17  * Communications Corp.  Portions created by the Initial Developer are
  18  * Copyright (C) 2001 the Initial Developer. All Rights Reserved.
  19  *
  20  * Contributor(s):
  21  *   Chris Waterson <waterson@netscape.com>
  22  *
  23  * Alternatively, the contents of this file may be used under the terms of
  24  * either the GNU General Public License Version 2 or later (the "GPL"), or
  25  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  26  * in which case the provisions of the GPL or the LGPL are applicable instead
  27  * of those above. If you wish to allow use of your version of this file only
  28  * under the terms of either the GPL or the LGPL, and not to allow others to
  29  * use your version of this file under the terms of the MPL, indicate your
  30  * decision by deleting the provisions above and replace them with the notice
  31  * and other provisions required by the GPL or the LGPL. If you do not delete
  32  * the provisions above, a recipient may use your version of this file under
  33  * the terms of any one of the MPL, the GPL or the LGPL.
  34  *
  35  * ***** END LICENSE BLOCK ***** */
  36
  37 /*
  38
  39   A program that reverse-maps a binary stream of address references to
  40   function names.
  41
  42  */
  43
  44 #include <fstream>
  45 #include <unistd.h>
  46 #include <fcntl.h>
  47 #include <stdio.h>
  48
  49 #include "elf_symbol_table.h"
  50
  51 #define _GNU_SOURCE
  52 #include <getopt.h>
  53
  54 static int
  55 map_addrs(int fd, elf_symbol_table &table)
  56 {
  57     // Read the binary addresses from stdin.
  58     unsigned int buf[128];
  59     ssize_t cb;
  60
  61     while ((cb = read(fd, buf, sizeof buf)) > 0) {
  62         if (cb % sizeof buf[0])
  63             fprintf(stderr, "unaligned read\n");
  64
  65         unsigned int *addr = buf;
  66         unsigned int *limit = buf + (cb / 4);
  67
  68         for (; addr < limit; ++addr) {
  69             const Elf32_Sym *sym = table.lookup(*addr);
  70             if (sym)
  71                 cout << table.get_symbol_name(sym) << endl;
  72         }
  73     }
  74
  75     return 0;
  76 }
  77
  78 static struct option long_options[] = {
  79     { "exe", required_argument, 0, 'e' },
  80     { 0,     0,                 0, 0   }
  81 };
  82
  83 static void
  84 usage()
  85 {
  86     cerr << "usage: mapaddrs --exe=exe file ..." << endl;
  87 }
  88
  89 int
  90 main(int argc, char *argv[])
  91 {
  92     elf_symbol_table table;
  93
  94     while (1) {
  95         int option_index = 0;
  96         int c = getopt_long(argc, argv, "e:", long_options, &option_index);
  97
  98         if (c < 0)
  99             break;
 100
 101         switch (c) {
 102         case 'e':
 103             table.init(optarg);
 104             break;
 105
 106         default:
 107             usage();
 108             return 1;
 109         }
 110     }
 111
 112     if (optind >= argc) {
 113         map_addrs(STDIN_FILENO, table);
 114     }
 115     else {
 116         do {
 117             int fd = open(argv[optind], O_RDONLY);
 118             if (fd < 0) {
 119                 perror(argv[optind]);
 120                 return 1;
 121             }
 122
 123             map_addrs(fd, table);
 124             close(fd);
 125         } while (++optind < argc);
 126     }
 127
 128     return 0;
 129 }