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/* Copyright (C) 2019-2020 Free Software Foundation, Inc.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
/* This file generates a number of DLL (PE/COFF binaries traditionally
used on Windows) that we can then utilize in various tests to
ensure objdump can parse these file correctly.
See:
https://www.ecma-international.org/publications/files/ECMA-ST/ECMA-335.pdf */
#include <memory.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define INCORRECT_USAGE 2
#define IO_ERROR 3
static void
write_dos_header_and_stub (FILE* file)
{
/* See ECMA-335 II.25.2.1.
Instead of lfanew, lets just hardcode the offset of the next byte
after this header (0x80). */
char buffer[128] =
{
0x4d, 0x5a, 0x90, 0x00, 0x03, 0x00, 0x00, 0x00,
0x04, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00,
0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, /* Last 4 bytes are precomputed lfanew. */
0x0e, 0x1f, 0xba, 0x0e, 0x00, 0xb4, 0x09, 0xcd,
0x21, 0xb8, 0x01, 0x4c, 0xcd, 0x21, 0x54, 0x68,
0x69, 0x73, 0x20, 0x70, 0x72, 0x6f, 0x67, 0x72,
0x61, 0x6d, 0x20, 0x63, 0x61, 0x6e, 0x6e, 0x6f,
0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x75, 0x6e,
0x20, 0x69, 0x6e, 0x20, 0x44, 0x4f, 0x53, 0x20,
0x6d, 0x6f, 0x64, 0x65, 0x2e, 0x0d, 0x0d, 0x0a,
0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
fwrite (buffer, 1, 128, file);
}
static void
write_pe_signature (FILE* file)
{
char buffer[4];
buffer[0] = 'P';
buffer[1] = 'E';
buffer[2] = 0;
buffer[3] = 0;
fwrite (buffer, 1, 4, file);
}
static void
write_coff_header (FILE* file, uint16_t machine)
{
char buffer[128];
memset (buffer, 0, sizeof (buffer));
/* Machine. ECMA-335 says this must be 0x14c but that's not true anymore. */
buffer[0] = machine & 0xff;
buffer[1] = machine >> 0x8;
fwrite (buffer, 2, 1, file);
memset (buffer, 0, sizeof (buffer));
/* NumberOfSections = 0. */
fwrite (buffer, 2, 1, file);
/* TimeDateStamp = 0. */
fwrite (buffer, 4, 1, file);
/* PointerToSymbolTable = 0. */
fwrite (buffer, 4, 1, file);
/* NumberOfSymbols = 0. */
fwrite (buffer, 4, 1, file);
/* OptionalHeaderSize = 0. */
fwrite (buffer, 2, 1, file);
/* Characteristics = 0x2000. */
buffer[0] = 0x00;
buffer[1] = 0x20;
fwrite (buffer, 2, 1, file);
memset (buffer, 0 , sizeof (buffer));
}
static void
write_simple_dll (const char* name, uint16_t machine)
{
FILE* file = fopen (name, "w");
if (file == NULL)
{
fprintf (stderr, "error: unable to open file for writing\n");
exit (IO_ERROR);
}
write_dos_header_and_stub (file);
write_pe_signature (file);
write_coff_header (file, machine);
fclose (file);
file = NULL;
printf ("wrote %s\n", name);
}
int
main (int argc, char** argv)
{
char* program_name = argv[0];
char* output_directory = argv[1];
int i;
if (argc < 3)
{
fprintf (stderr, "usage: %s output-directory format [format ...] \n\n", program_name);
fprintf (stderr, "format is an objdump-style format string, like pei-i386\n");
exit (INCORRECT_USAGE);
}
if (chdir (output_directory) != 0)
{
fprintf (stderr, "error: unable to change directory to %s\n", output_directory);
exit (INCORRECT_USAGE);
}
/* We generate a simple PEI format files, and then .NET Core on
Linux-style PEI files for a number of architectures. As opposed
to the more common PEI files that contain bytecode (CIL/MSIL), many
.NET Core DLLs are pre-compiled for specific architectures and
platforms. See https://github.com/jbevain/cecil/issues/337 for an
example of this value being used in practice. */
for (i = 2; i < argc; i++)
{
char* wanted_format = argv[i];
if (strcmp ("pei-i386", wanted_format) == 0)
{
write_simple_dll ("simple-pei-i386.dll", 0x14c);
write_simple_dll ("linux-pei-i386.dll", 0x14c ^ 0x7b79 /* i386 + Linux */);
}
else if (strcmp ("pei-x86-64", wanted_format) == 0)
{
write_simple_dll ("simple-pei-x86-64.dll", 0x8664);
write_simple_dll ("linux-pei-x86-64.dll", 0x8664 ^ 0x7b79 /* x86-64 + Linux */);
}
else
{
fprintf (stderr, "error: can't handle format %s\n", wanted_format);
exit (INCORRECT_USAGE);
}
}
return 0;
}
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