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5743648e | 1 | /* Dump Emacs in macho format. |
f80dc888 | 2 | Copyright (C) 1990, 1993 Free Software Foundation, Inc. |
5743648e RS |
3 | Written by Bradley Taylor (btaylor@next.com). |
4 | ||
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
f80dc888 | 9 | the Free Software Foundation; either version 2, or (at your option) |
5743648e RS |
10 | any later version. |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
21 | ||
22 | #undef __STRICT_BSD__ | |
23 | ||
24 | #include <stdio.h> | |
25 | #include <stdlib.h> | |
26 | #include <stdarg.h> | |
f80dc888 JB |
27 | #include <mach/mach.h> |
28 | #include <mach-o/loader.h> | |
5743648e RS |
29 | #include <sys/file.h> |
30 | #include <sys/stat.h> | |
31 | #include <libc.h> | |
32 | ||
33 | ||
f80dc888 | 34 | int malloc_cookie; |
5743648e RS |
35 | |
36 | /* | |
37 | * Kludge: we don't expect any program data beyond VM_HIGHDATA | |
38 | * What is really needed is a way to find out from malloc() which | |
39 | * pages it vm_allocated and write only those out into the data segment. | |
40 | * | |
41 | * This kludge may break when we stop using fixed virtual address | |
42 | * shared libraries. Actually, emacs will probably continue working, but be | |
43 | * much larger on disk than it needs to be (because non-malloced data will | |
44 | * be in the file). | |
45 | */ | |
46 | static const unsigned VM_HIGHDATA = 0x2000000; | |
47 | ||
48 | typedef struct region_t { | |
49 | vm_address_t address; | |
50 | vm_size_t size; | |
51 | vm_prot_t protection; | |
52 | vm_prot_t max_protection; | |
53 | vm_inherit_t inheritance; | |
54 | boolean_t shared; | |
55 | port_t object_name; | |
56 | vm_offset_t offset; | |
57 | } region_t; | |
58 | ||
59 | ||
60 | static void | |
61 | grow( | |
62 | struct load_command ***the_commands, | |
63 | unsigned *the_commands_len | |
64 | ) | |
65 | { | |
66 | if (*the_commands == NULL) { | |
67 | *the_commands_len = 1; | |
68 | *the_commands = malloc(sizeof(*the_commands)); | |
69 | } else { | |
70 | (*the_commands_len)++; | |
71 | *the_commands = realloc(*the_commands, | |
72 | (*the_commands_len * | |
73 | sizeof(**the_commands))); | |
74 | } | |
75 | } | |
76 | ||
77 | ||
78 | static void | |
79 | save_command( | |
80 | struct load_command *command, | |
81 | struct load_command ***the_commands, | |
82 | unsigned *the_commands_len | |
83 | ) | |
84 | { | |
85 | struct load_command **tmp; | |
86 | ||
87 | grow(the_commands, the_commands_len); | |
88 | tmp = &(*the_commands)[*the_commands_len - 1]; | |
89 | *tmp = malloc(command->cmdsize); | |
90 | bcopy(command, *tmp, command->cmdsize); | |
91 | } | |
92 | ||
93 | static void | |
94 | fatal_unexec(char *format, ...) | |
95 | { | |
96 | va_list ap; | |
97 | ||
98 | va_start(ap, format); | |
99 | fprintf(stderr, "unexec: "); | |
100 | vfprintf(stderr, format, ap); | |
101 | fprintf(stderr, "\n"); | |
102 | va_end(ap); | |
103 | } | |
104 | ||
105 | static int | |
106 | read_macho( | |
107 | int fd, | |
108 | struct mach_header *the_header, | |
109 | struct load_command ***the_commands, | |
110 | unsigned *the_commands_len | |
111 | ) | |
112 | { | |
113 | struct load_command command; | |
114 | struct load_command *buf; | |
115 | int i; | |
116 | int size; | |
117 | ||
118 | if (read(fd, the_header, sizeof(*the_header)) != sizeof(*the_header)) { | |
119 | fatal_unexec("cannot read macho header"); | |
120 | return (0); | |
121 | } | |
122 | for (i = 0; i < the_header->ncmds; i++) { | |
123 | if (read(fd, &command, sizeof(struct load_command)) != | |
124 | sizeof(struct load_command)) { | |
125 | fatal_unexec("cannot read macho load command header"); | |
126 | return (0); | |
127 | } | |
128 | size = command.cmdsize - sizeof(struct load_command); | |
129 | if (size < 0) { | |
130 | fatal_unexec("bogus load command size"); | |
131 | return (0); | |
132 | } | |
133 | buf = malloc(command.cmdsize); | |
134 | buf->cmd = command.cmd; | |
135 | buf->cmdsize = command.cmdsize; | |
136 | if (read(fd, ((char *)buf + | |
137 | sizeof(struct load_command)), | |
138 | size) != size) { | |
139 | fatal_unexec("cannot read load command data"); | |
140 | return (0); | |
141 | } | |
142 | save_command(buf, the_commands, the_commands_len); | |
143 | } | |
144 | return (1); | |
145 | } | |
146 | ||
147 | static int | |
148 | filldatagap( | |
149 | vm_address_t start_address, | |
150 | vm_size_t *size, | |
151 | vm_address_t end_address | |
152 | ) | |
153 | { | |
154 | vm_address_t address; | |
155 | vm_size_t gapsize; | |
156 | ||
157 | address = (start_address + *size); | |
158 | gapsize = end_address - address; | |
159 | *size += gapsize; | |
160 | if (vm_allocate(task_self(), &address, gapsize, | |
161 | FALSE) != KERN_SUCCESS) { | |
162 | fatal_unexec("cannot vm_allocate"); | |
163 | return (0); | |
164 | } | |
165 | return (1); | |
166 | } | |
167 | ||
168 | static int | |
169 | get_data_region( | |
170 | vm_address_t *address, | |
171 | vm_size_t *size | |
172 | ) | |
173 | { | |
174 | region_t region; | |
175 | kern_return_t ret; | |
176 | struct section *sect; | |
177 | ||
6930925e | 178 | sect = (struct section *) getsectbyname(SEG_DATA, SECT_DATA); |
5743648e RS |
179 | region.address = 0; |
180 | *address = 0; | |
181 | for (;;) { | |
182 | ret = vm_region(task_self(), | |
183 | ®ion.address, | |
184 | ®ion.size, | |
185 | ®ion.protection, | |
186 | ®ion.max_protection, | |
187 | ®ion.inheritance, | |
188 | ®ion.shared, | |
189 | ®ion.object_name, | |
190 | ®ion.offset); | |
191 | if (ret != KERN_SUCCESS || region.address >= VM_HIGHDATA) { | |
192 | break; | |
193 | } | |
194 | if (*address != 0) { | |
195 | if (region.address > *address + *size) { | |
196 | if (!filldatagap(*address, size, | |
197 | region.address)) { | |
198 | return (0); | |
199 | } | |
200 | } | |
201 | *size += region.size; | |
202 | } else { | |
203 | if (region.address == sect->addr) { | |
204 | *address = region.address; | |
205 | *size = region.size; | |
206 | } | |
207 | } | |
208 | region.address += region.size; | |
209 | } | |
210 | return (1); | |
211 | } | |
212 | ||
213 | static char * | |
214 | my_malloc( | |
215 | vm_size_t size | |
216 | ) | |
217 | { | |
218 | vm_address_t address; | |
219 | ||
220 | if (vm_allocate(task_self(), &address, size, TRUE) != KERN_SUCCESS) { | |
221 | return (NULL); | |
222 | } | |
223 | return ((char *)address); | |
224 | } | |
225 | ||
226 | static void | |
227 | my_free( | |
228 | char *buf, | |
229 | vm_size_t size | |
230 | ) | |
231 | { | |
232 | vm_deallocate(task_self(), (vm_address_t)buf, size); | |
233 | } | |
234 | ||
235 | static int | |
236 | unexec_doit( | |
237 | int infd, | |
238 | int outfd | |
239 | ) | |
240 | { | |
241 | int i; | |
242 | struct load_command **the_commands = NULL; | |
243 | unsigned the_commands_len; | |
244 | struct mach_header the_header; | |
245 | int fgrowth; | |
246 | int fdatastart; | |
247 | int fdatasize; | |
248 | int size; | |
249 | struct stat st; | |
250 | char *buf; | |
251 | vm_address_t data_address; | |
252 | vm_size_t data_size; | |
253 | ||
254 | struct segment_command *segment; | |
255 | ||
256 | if (!read_macho(infd, &the_header, &the_commands, &the_commands_len)) { | |
257 | return (0); | |
258 | } | |
259 | ||
260 | ||
f80dc888 | 261 | malloc_cookie = malloc_freezedry (); |
5743648e RS |
262 | if (!get_data_region(&data_address, &data_size)) { |
263 | return (0); | |
264 | } | |
265 | ||
266 | ||
267 | /* | |
268 | * DO NOT USE MALLOC IN THIS SECTION | |
269 | */ | |
270 | { | |
271 | /* | |
272 | * Fix offsets | |
273 | */ | |
274 | for (i = 0; i < the_commands_len; i++) { | |
275 | switch (the_commands[i]->cmd) { | |
276 | case LC_SEGMENT: | |
277 | segment = ((struct segment_command *) | |
278 | the_commands[i]); | |
279 | if (strcmp(segment->segname, SEG_DATA) == 0) { | |
280 | fdatastart = segment->fileoff; | |
281 | fdatasize = segment->filesize; | |
282 | fgrowth = (data_size - | |
283 | segment->filesize); | |
284 | segment->vmsize = data_size; | |
285 | segment->filesize = data_size; | |
286 | } | |
287 | break; | |
288 | case LC_SYMTAB: | |
289 | ((struct symtab_command *) | |
290 | the_commands[i])->symoff += fgrowth; | |
291 | ((struct symtab_command *) | |
292 | the_commands[i])->stroff += fgrowth; | |
293 | break; | |
294 | case LC_SYMSEG: | |
295 | ((struct symseg_command *) | |
296 | the_commands[i])->offset += fgrowth; | |
297 | break; | |
298 | default: | |
299 | break; | |
300 | } | |
301 | } | |
302 | ||
303 | /* | |
304 | * Write header | |
305 | */ | |
306 | if (write(outfd, &the_header, | |
307 | sizeof(the_header)) != sizeof(the_header)) { | |
308 | fatal_unexec("cannot write output file"); | |
309 | return (0); | |
310 | } | |
311 | ||
312 | /* | |
313 | * Write commands | |
314 | */ | |
315 | for (i = 0; i < the_commands_len; i++) { | |
316 | if (write(outfd, the_commands[i], | |
317 | the_commands[i]->cmdsize) != | |
318 | the_commands[i]->cmdsize) { | |
319 | fatal_unexec("cannot write output file"); | |
320 | return (0); | |
321 | } | |
322 | } | |
323 | ||
324 | /* | |
325 | * Write original text | |
326 | */ | |
327 | if (lseek(infd, the_header.sizeofcmds + sizeof(the_header), | |
328 | L_SET) < 0) { | |
329 | fatal_unexec("cannot seek input file"); | |
330 | return (0); | |
331 | } | |
332 | size = fdatastart - (sizeof(the_header) + | |
333 | the_header.sizeofcmds); | |
334 | buf = my_malloc(size); | |
335 | if (read(infd, buf, size) != size) { | |
336 | my_free(buf, size); | |
337 | fatal_unexec("cannot read input file"); | |
338 | } | |
339 | if (write(outfd, buf, size) != size) { | |
340 | my_free(buf, size); | |
341 | fatal_unexec("cannot write output file"); | |
342 | return (0); | |
343 | } | |
344 | my_free(buf, size); | |
345 | ||
346 | ||
347 | /* | |
348 | * Write new data | |
349 | */ | |
350 | if (write(outfd, (char *)data_address, | |
351 | data_size) != data_size) { | |
352 | fatal_unexec("cannot write output file"); | |
353 | return (0); | |
354 | } | |
355 | ||
356 | } | |
357 | ||
358 | /* | |
359 | * OKAY TO USE MALLOC NOW | |
360 | */ | |
361 | ||
362 | /* | |
363 | * Write rest of file | |
364 | */ | |
365 | fstat(infd, &st); | |
366 | if (lseek(infd, fdatasize, L_INCR) < 0) { | |
367 | fatal_unexec("cannot seek input file"); | |
368 | return (0); | |
369 | } | |
370 | size = st.st_size - lseek(infd, 0, L_INCR); | |
371 | ||
372 | buf = malloc(size); | |
373 | if (read(infd, buf, size) != size) { | |
374 | free(buf); | |
375 | fatal_unexec("cannot read input file"); | |
376 | return (0); | |
377 | } | |
378 | if (write(outfd, buf, size) != size) { | |
379 | free(buf); | |
380 | fatal_unexec("cannot write output file"); | |
381 | return (0); | |
382 | } | |
383 | free(buf); | |
384 | return (1); | |
385 | } | |
386 | ||
387 | void | |
388 | unexec( | |
389 | char *outfile, | |
390 | char *infile | |
391 | ) | |
392 | { | |
393 | int infd; | |
394 | int outfd; | |
395 | char tmpbuf[L_tmpnam]; | |
396 | char *tmpfile; | |
397 | ||
398 | infd = open(infile, O_RDONLY, 0); | |
399 | if (infd < 0) { | |
400 | fatal_unexec("cannot open input file `%s'", infile); | |
401 | exit(1); | |
402 | } | |
403 | ||
404 | tmpnam(tmpbuf); | |
405 | tmpfile = rindex(tmpbuf, '/'); | |
406 | if (tmpfile == NULL) { | |
407 | tmpfile = tmpbuf; | |
408 | } else { | |
409 | tmpfile++; | |
410 | } | |
411 | outfd = open(tmpfile, O_WRONLY|O_TRUNC|O_CREAT, 0755); | |
412 | if (outfd < 0) { | |
413 | close(infd); | |
414 | fatal_unexec("cannot open tmp file `%s'", tmpfile); | |
415 | exit(1); | |
416 | } | |
417 | if (!unexec_doit(infd, outfd)) { | |
418 | close(infd); | |
419 | close(outfd); | |
420 | unlink(tmpfile); | |
421 | exit(1); | |
422 | } | |
423 | close(infd); | |
424 | close(outfd); | |
425 | if (rename(tmpfile, outfile) < 0) { | |
426 | unlink(tmpfile); | |
427 | fatal_unexec("cannot rename `%s' to `%s'", tmpfile, outfile); | |
428 | exit(1); | |
429 | } | |
430 | } |