179 lines
5.3 KiB
C
179 lines
5.3 KiB
C
/* Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* This file generates a number of DLL (PE/COFF binaries traditionally
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used on Windows) that we can then utilize in various tests to
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ensure objdump can parse these file correctly.
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See:
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https://www.ecma-international.org/publications/files/ECMA-ST/ECMA-335.pdf */
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#include <memory.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define INCORRECT_USAGE 2
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#define IO_ERROR 3
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static void
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write_dos_header_and_stub (FILE* file)
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{
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/* See ECMA-335 II.25.2.1.
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Instead of lfanew, lets just hardcode the offset of the next byte
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after this header (0x80). */
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char buffer[128] =
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{
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0x4d, 0x5a, 0x90, 0x00, 0x03, 0x00, 0x00, 0x00,
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0x04, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00,
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0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, /* Last 4 bytes are precomputed lfanew. */
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0x0e, 0x1f, 0xba, 0x0e, 0x00, 0xb4, 0x09, 0xcd,
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0x21, 0xb8, 0x01, 0x4c, 0xcd, 0x21, 0x54, 0x68,
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0x69, 0x73, 0x20, 0x70, 0x72, 0x6f, 0x67, 0x72,
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0x61, 0x6d, 0x20, 0x63, 0x61, 0x6e, 0x6e, 0x6f,
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0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x75, 0x6e,
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0x20, 0x69, 0x6e, 0x20, 0x44, 0x4f, 0x53, 0x20,
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0x6d, 0x6f, 0x64, 0x65, 0x2e, 0x0d, 0x0d, 0x0a,
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0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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fwrite (buffer, 1, 128, file);
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}
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static void
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write_pe_signature (FILE* file)
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{
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char buffer[4];
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buffer[0] = 'P';
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buffer[1] = 'E';
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buffer[2] = 0;
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buffer[3] = 0;
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fwrite (buffer, 1, 4, file);
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}
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static void
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write_coff_header (FILE* file, uint16_t machine)
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{
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char buffer[128];
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memset (buffer, 0, sizeof (buffer));
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/* Machine. ECMA-335 says this must be 0x14c but that's not true anymore. */
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buffer[0] = machine & 0xff;
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buffer[1] = machine >> 0x8;
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fwrite (buffer, 2, 1, file);
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memset (buffer, 0, sizeof (buffer));
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/* NumberOfSections = 0. */
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fwrite (buffer, 2, 1, file);
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/* TimeDateStamp = 0. */
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fwrite (buffer, 4, 1, file);
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/* PointerToSymbolTable = 0. */
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fwrite (buffer, 4, 1, file);
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/* NumberOfSymbols = 0. */
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fwrite (buffer, 4, 1, file);
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/* OptionalHeaderSize = 0. */
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fwrite (buffer, 2, 1, file);
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/* Characteristics = 0x2000. */
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buffer[0] = 0x00;
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buffer[1] = 0x20;
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fwrite (buffer, 2, 1, file);
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memset (buffer, 0 , sizeof (buffer));
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}
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static void
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write_simple_dll (const char* name, uint16_t machine)
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{
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FILE* file = fopen (name, "w");
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if (file == NULL)
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{
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fprintf (stderr, "error: unable to open file for writing\n");
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exit (IO_ERROR);
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}
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write_dos_header_and_stub (file);
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write_pe_signature (file);
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write_coff_header (file, machine);
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fclose (file);
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file = NULL;
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printf ("wrote %s\n", name);
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}
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int
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main (int argc, char** argv)
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{
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char* program_name = argv[0];
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char* output_directory = argv[1];
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int i;
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if (argc < 3)
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{
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fprintf (stderr, "usage: %s output-directory format [format ...] \n\n", program_name);
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fprintf (stderr, "format is an objdump-style format string, like pei-i386\n");
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exit (INCORRECT_USAGE);
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}
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if (chdir (output_directory) != 0)
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{
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fprintf (stderr, "error: unable to change directory to %s\n", output_directory);
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exit (INCORRECT_USAGE);
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}
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/* We generate a simple PEI format files, and then .NET Core on
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Linux-style PEI files for a number of architectures. As opposed
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to the more common PEI files that contain bytecode (CIL/MSIL), many
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.NET Core DLLs are pre-compiled for specific architectures and
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platforms. See https://github.com/jbevain/cecil/issues/337 for an
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example of this value being used in practice. */
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for (i = 2; i < argc; i++)
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{
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char* wanted_format = argv[i];
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if (strcmp ("pei-i386", wanted_format) == 0)
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{
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write_simple_dll ("simple-pei-i386.dll", 0x14c);
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write_simple_dll ("linux-pei-i386.dll", 0x14c ^ 0x7b79 /* i386 + Linux */);
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}
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else if (strcmp ("pei-x86-64", wanted_format) == 0)
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{
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write_simple_dll ("simple-pei-x86-64.dll", 0x8664);
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write_simple_dll ("linux-pei-x86-64.dll", 0x8664 ^ 0x7b79 /* x86-64 + Linux */);
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}
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else
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{
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fprintf (stderr, "error: can't handle format %s\n", wanted_format);
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exit (INCORRECT_USAGE);
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}
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}
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return 0;
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}
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