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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 | } |