binutils/testsuite/gentestdlls.c

   1 /* Copyright (C) 2019-2021 Free Software Foundation, Inc.
   2
   3    This file is part of GNU Binutils.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  18    02110-1301, USA.  */
  19
  20
  21 /* This file generates a number of DLL (PE/COFF binaries traditionally
  22    used on Windows) that we can then utilize in various tests to
  23    ensure objdump can parse these file correctly.
  24
  25    See:
  26    https://www.ecma-international.org/publications/files/ECMA-ST/ECMA-335.pdf  */
  27
  28 #include <memory.h>
  29 #include <stdint.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34
  35 #define INCORRECT_USAGE 2
  36 #define IO_ERROR 3
  37
  38 static void
  39 write_dos_header_and_stub (FILE* file)
  40 {
  41   /* See ECMA-335 II.25.2.1.
  42      Instead of lfanew, lets just hardcode the offset of the next byte
  43      after this header (0x80).  */
  44   char buffer[128] =
  45     {
  46      0x4d, 0x5a, 0x90, 0x00, 0x03, 0x00, 0x00, 0x00,
  47      0x04, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00,
  48      0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  49      0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  50      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  51      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  52      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  53      0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, /* Last 4 bytes are precomputed lfanew.  */
  54      0x0e, 0x1f, 0xba, 0x0e, 0x00, 0xb4, 0x09, 0xcd,
  55      0x21, 0xb8, 0x01, 0x4c, 0xcd, 0x21, 0x54, 0x68,
  56      0x69, 0x73, 0x20, 0x70, 0x72, 0x6f, 0x67, 0x72,
  57      0x61, 0x6d, 0x20, 0x63, 0x61, 0x6e, 0x6e, 0x6f,
  58      0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x75, 0x6e,
  59      0x20, 0x69, 0x6e, 0x20, 0x44, 0x4f, 0x53, 0x20,
  60      0x6d, 0x6f, 0x64, 0x65, 0x2e, 0x0d, 0x0d, 0x0a,
  61      0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  62     };
  63
  64   fwrite (buffer, 1, 128, file);
  65 }
  66
  67 static void
  68 write_pe_signature (FILE* file)
  69 {
  70   char buffer[4];
  71
  72   buffer[0] = 'P';
  73   buffer[1] = 'E';
  74   buffer[2] = 0;
  75   buffer[3] = 0;
  76   fwrite (buffer, 1, 4, file);
  77 }
  78
  79 static void
  80 write_coff_header (FILE* file, uint16_t machine)
  81 {
  82   char buffer[128];
  83
  84   memset (buffer, 0, sizeof (buffer));
  85
  86   /* Machine.  ECMA-335 says this must be 0x14c but that's not true anymore.  */
  87   buffer[0] = machine & 0xff;
  88   buffer[1] = machine >> 0x8;
  89   fwrite (buffer, 2, 1, file);
  90   memset (buffer, 0, sizeof (buffer));
  91   /* NumberOfSections = 0.  */
  92   fwrite (buffer, 2, 1, file);
  93   /* TimeDateStamp = 0.  */
  94   fwrite (buffer, 4, 1, file);
  95   /* PointerToSymbolTable = 0.  */
  96   fwrite (buffer, 4, 1, file);
  97   /* NumberOfSymbols = 0.  */
  98   fwrite (buffer, 4, 1, file);
  99   /* OptionalHeaderSize = 0.  */
 100   fwrite (buffer, 2, 1, file);
 101   /* Characteristics = 0x2000.  */
 102   buffer[0] = 0x00;
 103   buffer[1] = 0x20;
 104   fwrite (buffer, 2, 1, file);
 105   memset (buffer, 0 , sizeof (buffer));
 106 }
 107
 108 static void
 109 write_simple_dll (const char* name, uint16_t machine)
 110 {
 111   FILE* file = fopen (name, "w");
 112
 113   if (file == NULL)
 114     {
 115       fprintf (stderr, "error: unable to open file for writing\n");
 116       exit (IO_ERROR);
 117     }
 118
 119   write_dos_header_and_stub (file);
 120   write_pe_signature (file);
 121   write_coff_header (file, machine);
 122   fclose (file);
 123   file = NULL;
 124   printf ("wrote %s\n", name);
 125 }
 126
 127 int
 128 main (int argc, char** argv)
 129 {
 130   char* program_name = argv[0];
 131   char* output_directory = argv[1];
 132   int i;
 133
 134   if (argc < 3)
 135     {
 136       fprintf (stderr, "usage: %s output-directory format [format ...] \n\n", program_name);
 137       fprintf (stderr, "format is an objdump-style format string, like pei-i386\n");
 138       exit (INCORRECT_USAGE);
 139     }
 140
 141   if (chdir (output_directory) != 0)
 142     {
 143       fprintf (stderr, "error: unable to change directory to %s\n", output_directory);
 144       exit (INCORRECT_USAGE);
 145     }
 146
 147   /* We generate a simple PEI format files, and then .NET Core on
 148      Linux-style PEI files for a number of architectures.  As opposed
 149      to the more common PEI files that contain bytecode (CIL/MSIL), many
 150      .NET Core DLLs are pre-compiled for specific architectures and
 151      platforms.  See https://github.com/jbevain/cecil/issues/337 for an
 152      example of this value being used in practice.  */
 153
 154   for (i = 2; i < argc; i++)
 155     {
 156       char* wanted_format = argv[i];
 157
 158       if (strcmp ("pei-i386", wanted_format) == 0)
 159         {
 160           write_simple_dll ("simple-pei-i386.dll", 0x14c);
 161
 162           write_simple_dll ("linux-pei-i386.dll", 0x14c ^ 0x7b79 /* i386 + Linux */);
 163         }
 164       else if (strcmp ("pei-x86-64", wanted_format) == 0)
 165         {
 166           write_simple_dll ("simple-pei-x86-64.dll", 0x8664);
 167
 168           write_simple_dll ("linux-pei-x86-64.dll", 0x8664 ^ 0x7b79 /* x86-64 + Linux */);
 169         }
 170       else
 171         {
 172           fprintf (stderr, "error: can't handle format %s\n", wanted_format);
 173           exit (INCORRECT_USAGE);
 174         }
 175     }
 176
 177   return 0;
 178 }