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3e62da95 SM |
1 | /* unexec() support for Cygwin; |
2 | complete rewrite of xemacs Cygwin unexec() code | |
3 | ||
4e6835db | 4 | Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
3e62da95 SM |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
8 | GNU Emacs is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
684d6f5b | 10 | the Free Software Foundation; either version 3, or (at your option) |
3e62da95 SM |
11 | any later version. |
12 | ||
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GNU Emacs; see the file COPYING. If not, write to | |
4fc5845f LK |
20 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
3e62da95 SM |
22 | |
23 | #include <config.h> | |
24 | #include <lisp.h> | |
25 | #include <stdio.h> | |
26 | #include <fcntl.h> | |
27 | #include <a.out.h> | |
28 | #include <unistd.h> | |
29 | #include <assert.h> | |
30 | ||
31 | #define DOTEXE ".exe" | |
32 | ||
33 | extern int bss_sbrk_did_unexec; | |
34 | ||
35 | /* emacs symbols that indicate where bss and data end for emacs internals */ | |
36 | extern char my_endbss[]; | |
37 | extern char my_edata[]; | |
38 | ||
39 | /* | |
40 | ** header for Windows executable files | |
41 | */ | |
42 | typedef struct | |
43 | { | |
44 | FILHDR file_header; | |
45 | PEAOUTHDR file_optional_header; | |
46 | SCNHDR section_header[32]; | |
47 | } exe_header_t; | |
48 | ||
49 | int debug_unexcw = 0; | |
50 | ||
51 | /* | |
52 | ** Read the header from the executable into memory so we can more easily access it. | |
53 | */ | |
54 | static exe_header_t * | |
55 | read_exe_header (int fd, exe_header_t * exe_header_buffer) | |
56 | { | |
57 | int i; | |
58 | int ret; | |
59 | ||
60 | assert (fd >= 0); | |
61 | assert (exe_header_buffer != 0); | |
62 | ||
63 | ret = lseek (fd, 0L, SEEK_SET); | |
64 | assert (ret != -1); | |
65 | ||
66 | ret = | |
67 | read (fd, &exe_header_buffer->file_header, | |
68 | sizeof (exe_header_buffer->file_header)); | |
69 | assert (ret == sizeof (exe_header_buffer->file_header)); | |
70 | ||
71 | assert (exe_header_buffer->file_header.e_magic == 0x5a4d); | |
72 | assert (exe_header_buffer->file_header.nt_signature == 0x4550); | |
73 | assert (exe_header_buffer->file_header.f_magic == 0x014c); | |
74 | assert (exe_header_buffer->file_header.f_nscns > 0); | |
75 | assert (exe_header_buffer->file_header.f_nscns <= | |
76 | sizeof (exe_header_buffer->section_header) / | |
77 | sizeof (exe_header_buffer->section_header[0])); | |
78 | assert (exe_header_buffer->file_header.f_opthdr > 0); | |
79 | ||
80 | ret = | |
81 | read (fd, &exe_header_buffer->file_optional_header, | |
82 | sizeof (exe_header_buffer->file_optional_header)); | |
83 | assert (ret == sizeof (exe_header_buffer->file_optional_header)); | |
84 | ||
85 | assert (exe_header_buffer->file_optional_header.magic == 0x010b); | |
86 | ||
87 | for (i = 0; i < exe_header_buffer->file_header.f_nscns; ++i) | |
88 | { | |
89 | ret = | |
90 | read (fd, &exe_header_buffer->section_header[i], | |
91 | sizeof (exe_header_buffer->section_header[i])); | |
92 | assert (ret == sizeof (exe_header_buffer->section_header[i])); | |
93 | } | |
94 | ||
95 | return (exe_header_buffer); | |
96 | } | |
97 | ||
98 | /* | |
99 | ** Fix the dumped emacs executable: | |
100 | ** | |
101 | ** - copy .data section data of interest from running executable into | |
102 | ** output .exe file | |
103 | ** | |
104 | ** - convert .bss section into an initialized data section (like | |
105 | ** .data) and copy .bss section data of interest from running | |
106 | ** executable into output .exe file | |
107 | */ | |
108 | static void | |
109 | fixup_executable (int fd) | |
110 | { | |
111 | exe_header_t exe_header_buffer; | |
112 | exe_header_t *exe_header; | |
113 | int i; | |
114 | int ret; | |
115 | int found_data = 0; | |
116 | int found_bss = 0; | |
117 | ||
118 | exe_header = read_exe_header (fd, &exe_header_buffer); | |
119 | assert (exe_header != 0); | |
120 | ||
121 | assert (exe_header->file_header.f_nscns > 0); | |
122 | for (i = 0; i < exe_header->file_header.f_nscns; ++i) | |
123 | { | |
124 | unsigned long start_address = | |
125 | exe_header->section_header[i].s_vaddr + | |
126 | exe_header->file_optional_header.ImageBase; | |
127 | unsigned long end_address = | |
128 | exe_header->section_header[i].s_vaddr + | |
129 | exe_header->file_optional_header.ImageBase + | |
130 | exe_header->section_header[i].s_paddr; | |
131 | if (debug_unexcw) | |
132 | printf ("%8s start 0x%08x end 0x%08x\n", | |
133 | exe_header->section_header[i].s_name, | |
134 | start_address, end_address); | |
135 | if (my_edata >= (char *) start_address | |
136 | && my_edata < (char *) end_address) | |
137 | { | |
138 | /* data section */ | |
139 | ret = | |
140 | lseek (fd, (long) (exe_header->section_header[i].s_scnptr), | |
141 | SEEK_SET); | |
142 | assert (ret != -1); | |
143 | ret = | |
144 | write (fd, (char *) start_address, | |
145 | my_edata - (char *) start_address); | |
146 | assert (ret == my_edata - (char *) start_address); | |
147 | ++found_data; | |
148 | if (debug_unexcw) | |
149 | printf (" .data, mem start 0x%08x mem length %d\n", | |
150 | start_address, my_edata - (char *) start_address); | |
151 | if (debug_unexcw) | |
152 | printf (" .data, file start %d file length %d\n", | |
153 | (int) exe_header->section_header[i].s_scnptr, | |
154 | (int) exe_header->section_header[i].s_paddr); | |
155 | } | |
156 | else if (my_endbss >= (char *) start_address | |
157 | && my_endbss < (char *) end_address) | |
158 | { | |
159 | /* bss section */ | |
160 | ++found_bss; | |
161 | if (exe_header->section_header[i].s_flags & 0x00000080) | |
162 | { | |
163 | /* convert uninitialized data section to initialized data section */ | |
164 | struct stat statbuf; | |
165 | ret = fstat (fd, &statbuf); | |
166 | assert (ret != -1); | |
167 | ||
168 | exe_header->section_header[i].s_flags &= ~0x00000080; | |
169 | exe_header->section_header[i].s_flags |= 0x00000040; | |
170 | ||
171 | exe_header->section_header[i].s_scnptr = | |
172 | (statbuf.st_size + | |
173 | exe_header->file_optional_header.FileAlignment) / | |
174 | exe_header->file_optional_header.FileAlignment * | |
175 | exe_header->file_optional_header.FileAlignment; | |
176 | ||
177 | exe_header->section_header[i].s_size = | |
178 | (exe_header->section_header[i].s_paddr + | |
179 | exe_header->file_optional_header.FileAlignment) / | |
180 | exe_header->file_optional_header.FileAlignment * | |
181 | exe_header->file_optional_header.FileAlignment; | |
182 | ||
183 | ret = | |
184 | lseek (fd, | |
185 | (long) (exe_header->section_header[i].s_scnptr + | |
186 | exe_header->section_header[i].s_size - 1), | |
187 | SEEK_SET); | |
188 | assert (ret != -1); | |
189 | ret = write (fd, "", 1); | |
190 | assert (ret == 1); | |
191 | ||
192 | ret = | |
193 | lseek (fd, | |
194 | (long) ((char *) &exe_header->section_header[i] - | |
195 | (char *) exe_header), SEEK_SET); | |
196 | assert (ret != -1); | |
197 | ret = | |
198 | write (fd, &exe_header->section_header[i], | |
199 | sizeof (exe_header->section_header[i])); | |
200 | assert (ret == sizeof (exe_header->section_header[i])); | |
201 | if (debug_unexcw) | |
202 | printf (" seek to %ld, write %d\n", | |
203 | (long) ((char *) &exe_header->section_header[i] - | |
204 | (char *) exe_header), | |
205 | sizeof (exe_header->section_header[i])); | |
206 | } | |
207 | /* write initialized data section */ | |
208 | ret = | |
209 | lseek (fd, (long) (exe_header->section_header[i].s_scnptr), | |
210 | SEEK_SET); | |
211 | assert (ret != -1); | |
212 | ret = | |
213 | write (fd, (char *) start_address, | |
214 | my_endbss - (char *) start_address); | |
215 | assert (ret == (my_endbss - (char *) start_address)); | |
216 | if (debug_unexcw) | |
217 | printf (" .bss, mem start 0x%08x mem length %d\n", | |
218 | start_address, my_endbss - (char *) start_address); | |
219 | if (debug_unexcw) | |
220 | printf (" .bss, file start %d file length %d\n", | |
221 | (int) exe_header->section_header[i].s_scnptr, | |
222 | (int) exe_header->section_header[i].s_paddr); | |
223 | } | |
224 | } | |
225 | assert (found_bss == 1); | |
226 | assert (found_data == 1); | |
227 | } | |
228 | ||
229 | /* | |
230 | ** Windows likes .exe suffixes on executables. | |
231 | */ | |
232 | static char * | |
233 | add_exe_suffix_if_necessary (const char *name, char *modified) | |
234 | { | |
235 | int i = strlen (name); | |
236 | if (i <= (sizeof (DOTEXE) - 1)) | |
237 | { | |
238 | sprintf (modified, "%s%s", name, DOTEXE); | |
239 | } | |
240 | else if (!strcasecmp (name + i - (sizeof (DOTEXE) - 1), DOTEXE)) | |
241 | { | |
242 | strcpy (modified, name); | |
243 | } | |
244 | else | |
245 | { | |
246 | sprintf (modified, "%s%s", name, DOTEXE); | |
247 | } | |
248 | return (modified); | |
249 | } | |
250 | ||
251 | int | |
252 | unexec (char *outfile, char *infile, unsigned start_data, unsigned d1, | |
253 | unsigned d2) | |
254 | { | |
255 | char infile_buffer[FILENAME_MAX]; | |
256 | char outfile_buffer[FILENAME_MAX]; | |
257 | int fd_in; | |
258 | int fd_out; | |
259 | int ret; | |
260 | int ret2; | |
261 | ||
262 | if (bss_sbrk_did_unexec) | |
263 | { | |
264 | /* can only dump once */ | |
60a294e2 | 265 | printf ("You can only dump Emacs once on this platform.\n"); |
3e62da95 SM |
266 | return (1); |
267 | } | |
268 | ||
269 | report_sheap_usage (1); | |
270 | ||
271 | infile = add_exe_suffix_if_necessary (infile, infile_buffer); | |
272 | outfile = add_exe_suffix_if_necessary (outfile, outfile_buffer); | |
273 | ||
274 | fd_in = open (infile, O_RDONLY | O_BINARY); | |
275 | assert (fd_in >= 0); | |
276 | fd_out = open (outfile, O_RDWR | O_TRUNC | O_CREAT | O_BINARY, 0755); | |
277 | assert (fd_out >= 0); | |
278 | for (;;) | |
279 | { | |
280 | char buffer[4096]; | |
281 | ret = read (fd_in, buffer, sizeof (buffer)); | |
282 | if (ret == 0) | |
283 | { | |
284 | /* eof */ | |
285 | break; | |
286 | } | |
287 | assert (ret > 0); | |
288 | /* data */ | |
289 | ret2 = write (fd_out, buffer, ret); | |
290 | assert (ret2 == ret); | |
291 | } | |
292 | ret = close (fd_in); | |
293 | assert (ret == 0); | |
294 | ||
295 | bss_sbrk_did_unexec = 1; | |
296 | fixup_executable (fd_out); | |
297 | bss_sbrk_did_unexec = 0; | |
298 | ||
299 | ret = close (fd_out); | |
300 | assert (ret == 0); | |
301 | ||
302 | return (0); | |
303 | } | |
92713841 MB |
304 | |
305 | /* arch-tag: fc44f6c3-ca0a-45e0-a5a2-58b6101b1e65 | |
306 | (do not change this comment) */ |