Commit | Line | Data |
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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 | |
3b7ad313 EN |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
5743648e RS |
21 | |
22 | ||
23 | #undef __STRICT_BSD__ | |
24 | ||
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <stdarg.h> | |
f80dc888 JB |
28 | #include <mach/mach.h> |
29 | #include <mach-o/loader.h> | |
acacb292 | 30 | #include <mach-o/reloc.h> |
5743648e RS |
31 | #include <sys/file.h> |
32 | #include <sys/stat.h> | |
3e4a1803 | 33 | #include <unistd.h> |
e6bab6e4 RS |
34 | /* Instead of unistd.h, this used to include libc.h. |
35 | "Nelson H. F. Beebe" <beebe@math.utah.edu> says that doesn't work | |
36 | in system version 3.3. */ | |
5743648e RS |
37 | |
38 | ||
f80dc888 | 39 | int malloc_cookie; |
5743648e RS |
40 | |
41 | /* | |
42 | * Kludge: we don't expect any program data beyond VM_HIGHDATA | |
43 | * What is really needed is a way to find out from malloc() which | |
44 | * pages it vm_allocated and write only those out into the data segment. | |
45 | * | |
46 | * This kludge may break when we stop using fixed virtual address | |
47 | * shared libraries. Actually, emacs will probably continue working, but be | |
48 | * much larger on disk than it needs to be (because non-malloced data will | |
49 | * be in the file). | |
50 | */ | |
51 | static const unsigned VM_HIGHDATA = 0x2000000; | |
52 | ||
53 | typedef struct region_t { | |
54 | vm_address_t address; | |
55 | vm_size_t size; | |
56 | vm_prot_t protection; | |
57 | vm_prot_t max_protection; | |
58 | vm_inherit_t inheritance; | |
59 | boolean_t shared; | |
60 | port_t object_name; | |
61 | vm_offset_t offset; | |
62 | } region_t; | |
63 | ||
64 | ||
65 | static void | |
66 | grow( | |
67 | struct load_command ***the_commands, | |
68 | unsigned *the_commands_len | |
69 | ) | |
70 | { | |
71 | if (*the_commands == NULL) { | |
72 | *the_commands_len = 1; | |
73 | *the_commands = malloc(sizeof(*the_commands)); | |
74 | } else { | |
75 | (*the_commands_len)++; | |
76 | *the_commands = realloc(*the_commands, | |
77 | (*the_commands_len * | |
78 | sizeof(**the_commands))); | |
79 | } | |
80 | } | |
81 | ||
82 | ||
83 | static void | |
84 | save_command( | |
85 | struct load_command *command, | |
86 | struct load_command ***the_commands, | |
87 | unsigned *the_commands_len | |
88 | ) | |
89 | { | |
90 | struct load_command **tmp; | |
91 | ||
92 | grow(the_commands, the_commands_len); | |
93 | tmp = &(*the_commands)[*the_commands_len - 1]; | |
94 | *tmp = malloc(command->cmdsize); | |
95 | bcopy(command, *tmp, command->cmdsize); | |
96 | } | |
97 | ||
98 | static void | |
99 | fatal_unexec(char *format, ...) | |
100 | { | |
101 | va_list ap; | |
102 | ||
103 | va_start(ap, format); | |
104 | fprintf(stderr, "unexec: "); | |
105 | vfprintf(stderr, format, ap); | |
106 | fprintf(stderr, "\n"); | |
107 | va_end(ap); | |
108 | } | |
109 | ||
110 | static int | |
111 | read_macho( | |
112 | int fd, | |
113 | struct mach_header *the_header, | |
114 | struct load_command ***the_commands, | |
115 | unsigned *the_commands_len | |
116 | ) | |
117 | { | |
118 | struct load_command command; | |
119 | struct load_command *buf; | |
120 | int i; | |
121 | int size; | |
122 | ||
123 | if (read(fd, the_header, sizeof(*the_header)) != sizeof(*the_header)) { | |
124 | fatal_unexec("cannot read macho header"); | |
125 | return (0); | |
126 | } | |
127 | for (i = 0; i < the_header->ncmds; i++) { | |
128 | if (read(fd, &command, sizeof(struct load_command)) != | |
129 | sizeof(struct load_command)) { | |
130 | fatal_unexec("cannot read macho load command header"); | |
131 | return (0); | |
132 | } | |
133 | size = command.cmdsize - sizeof(struct load_command); | |
134 | if (size < 0) { | |
135 | fatal_unexec("bogus load command size"); | |
136 | return (0); | |
137 | } | |
138 | buf = malloc(command.cmdsize); | |
139 | buf->cmd = command.cmd; | |
140 | buf->cmdsize = command.cmdsize; | |
141 | if (read(fd, ((char *)buf + | |
142 | sizeof(struct load_command)), | |
143 | size) != size) { | |
144 | fatal_unexec("cannot read load command data"); | |
145 | return (0); | |
146 | } | |
147 | save_command(buf, the_commands, the_commands_len); | |
148 | } | |
149 | return (1); | |
150 | } | |
151 | ||
152 | static int | |
153 | filldatagap( | |
154 | vm_address_t start_address, | |
155 | vm_size_t *size, | |
156 | vm_address_t end_address | |
157 | ) | |
158 | { | |
159 | vm_address_t address; | |
160 | vm_size_t gapsize; | |
161 | ||
162 | address = (start_address + *size); | |
163 | gapsize = end_address - address; | |
164 | *size += gapsize; | |
165 | if (vm_allocate(task_self(), &address, gapsize, | |
166 | FALSE) != KERN_SUCCESS) { | |
167 | fatal_unexec("cannot vm_allocate"); | |
168 | return (0); | |
169 | } | |
170 | return (1); | |
171 | } | |
172 | ||
173 | static int | |
174 | get_data_region( | |
175 | vm_address_t *address, | |
176 | vm_size_t *size | |
177 | ) | |
178 | { | |
179 | region_t region; | |
180 | kern_return_t ret; | |
181 | struct section *sect; | |
182 | ||
6930925e | 183 | sect = (struct section *) getsectbyname(SEG_DATA, SECT_DATA); |
5743648e RS |
184 | region.address = 0; |
185 | *address = 0; | |
186 | for (;;) { | |
187 | ret = vm_region(task_self(), | |
188 | ®ion.address, | |
189 | ®ion.size, | |
190 | ®ion.protection, | |
191 | ®ion.max_protection, | |
192 | ®ion.inheritance, | |
193 | ®ion.shared, | |
194 | ®ion.object_name, | |
195 | ®ion.offset); | |
196 | if (ret != KERN_SUCCESS || region.address >= VM_HIGHDATA) { | |
197 | break; | |
198 | } | |
199 | if (*address != 0) { | |
200 | if (region.address > *address + *size) { | |
201 | if (!filldatagap(*address, size, | |
202 | region.address)) { | |
203 | return (0); | |
204 | } | |
205 | } | |
206 | *size += region.size; | |
207 | } else { | |
208 | if (region.address == sect->addr) { | |
209 | *address = region.address; | |
210 | *size = region.size; | |
211 | } | |
212 | } | |
213 | region.address += region.size; | |
214 | } | |
215 | return (1); | |
216 | } | |
217 | ||
218 | static char * | |
219 | my_malloc( | |
220 | vm_size_t size | |
221 | ) | |
222 | { | |
223 | vm_address_t address; | |
224 | ||
225 | if (vm_allocate(task_self(), &address, size, TRUE) != KERN_SUCCESS) { | |
226 | return (NULL); | |
227 | } | |
228 | return ((char *)address); | |
229 | } | |
230 | ||
231 | static void | |
232 | my_free( | |
233 | char *buf, | |
234 | vm_size_t size | |
235 | ) | |
236 | { | |
237 | vm_deallocate(task_self(), (vm_address_t)buf, size); | |
238 | } | |
239 | ||
240 | static int | |
241 | unexec_doit( | |
242 | int infd, | |
243 | int outfd | |
244 | ) | |
245 | { | |
246 | int i; | |
247 | struct load_command **the_commands = NULL; | |
248 | unsigned the_commands_len; | |
249 | struct mach_header the_header; | |
acacb292 | 250 | int fgrowth = 0; |
5743648e RS |
251 | int fdatastart; |
252 | int fdatasize; | |
253 | int size; | |
254 | struct stat st; | |
255 | char *buf; | |
256 | vm_address_t data_address; | |
257 | vm_size_t data_size; | |
acacb292 RS |
258 | vm_size_t vmaddr_growth = 0; |
259 | vm_size_t dataseg_vmaddr, dataseg_vmend; | |
5743648e RS |
260 | |
261 | struct segment_command *segment; | |
262 | ||
acacb292 RS |
263 | #ifdef NS_TARGET |
264 | unsigned long extreloff = 0; | |
265 | unsigned long nextrel = 0; | |
266 | struct dysymtab_command *dysymtab; | |
267 | struct relocation_info reloc_info; | |
268 | #endif | |
269 | ||
5743648e RS |
270 | if (!read_macho(infd, &the_header, &the_commands, &the_commands_len)) { |
271 | return (0); | |
272 | } | |
273 | ||
274 | ||
f80dc888 | 275 | malloc_cookie = malloc_freezedry (); |
5743648e RS |
276 | if (!get_data_region(&data_address, &data_size)) { |
277 | return (0); | |
278 | } | |
279 | ||
280 | ||
281 | /* | |
282 | * DO NOT USE MALLOC IN THIS SECTION | |
283 | */ | |
284 | { | |
285 | /* | |
286 | * Fix offsets | |
287 | */ | |
288 | for (i = 0; i < the_commands_len; i++) { | |
289 | switch (the_commands[i]->cmd) { | |
290 | case LC_SEGMENT: | |
291 | segment = ((struct segment_command *) | |
292 | the_commands[i]); | |
293 | if (strcmp(segment->segname, SEG_DATA) == 0) { | |
294 | fdatastart = segment->fileoff; | |
295 | fdatasize = segment->filesize; | |
296 | fgrowth = (data_size - | |
297 | segment->filesize); | |
298 | segment->vmsize = data_size; | |
299 | segment->filesize = data_size; | |
acacb292 RS |
300 | dataseg_vmaddr = segment->vmaddr; |
301 | dataseg_vmend = segment->vmaddr + segment->vmsize; | |
302 | vmaddr_growth = segment->vmaddr + segment->vmsize; | |
303 | } else { | |
304 | ((struct segment_command *)the_commands[i])->fileoff += fgrowth; | |
305 | } | |
306 | ||
307 | if( strcmp( segment->segname, SEG_LINKEDIT ) == 0 ) { | |
308 | segment->vmaddr = vmaddr_growth; | |
5743648e | 309 | } |
acacb292 | 310 | |
5743648e RS |
311 | break; |
312 | case LC_SYMTAB: | |
313 | ((struct symtab_command *) | |
314 | the_commands[i])->symoff += fgrowth; | |
315 | ((struct symtab_command *) | |
316 | the_commands[i])->stroff += fgrowth; | |
317 | break; | |
318 | case LC_SYMSEG: | |
319 | ((struct symseg_command *) | |
320 | the_commands[i])->offset += fgrowth; | |
321 | break; | |
acacb292 RS |
322 | #ifdef NS_TARGET |
323 | case LC_DYSYMTAB: | |
324 | dysymtab = ((struct dysymtab_command *)the_commands[i]); | |
325 | extreloff = dysymtab->extreloff; | |
326 | nextrel = dysymtab->nextrel; | |
327 | dysymtab->indirectsymoff += fgrowth; | |
328 | dysymtab->extreloff += fgrowth; | |
329 | break; | |
330 | #endif | |
5743648e RS |
331 | default: |
332 | break; | |
333 | } | |
334 | } | |
335 | ||
336 | /* | |
337 | * Write header | |
338 | */ | |
339 | if (write(outfd, &the_header, | |
340 | sizeof(the_header)) != sizeof(the_header)) { | |
341 | fatal_unexec("cannot write output file"); | |
342 | return (0); | |
343 | } | |
344 | ||
345 | /* | |
346 | * Write commands | |
347 | */ | |
348 | for (i = 0; i < the_commands_len; i++) { | |
349 | if (write(outfd, the_commands[i], | |
350 | the_commands[i]->cmdsize) != | |
351 | the_commands[i]->cmdsize) { | |
352 | fatal_unexec("cannot write output file"); | |
353 | return (0); | |
354 | } | |
355 | } | |
356 | ||
357 | /* | |
358 | * Write original text | |
359 | */ | |
360 | if (lseek(infd, the_header.sizeofcmds + sizeof(the_header), | |
361 | L_SET) < 0) { | |
362 | fatal_unexec("cannot seek input file"); | |
363 | return (0); | |
364 | } | |
365 | size = fdatastart - (sizeof(the_header) + | |
366 | the_header.sizeofcmds); | |
367 | buf = my_malloc(size); | |
368 | if (read(infd, buf, size) != size) { | |
369 | my_free(buf, size); | |
370 | fatal_unexec("cannot read input file"); | |
371 | } | |
372 | if (write(outfd, buf, size) != size) { | |
373 | my_free(buf, size); | |
374 | fatal_unexec("cannot write output file"); | |
375 | return (0); | |
376 | } | |
377 | my_free(buf, size); | |
378 | ||
379 | ||
380 | /* | |
381 | * Write new data | |
382 | */ | |
383 | if (write(outfd, (char *)data_address, | |
384 | data_size) != data_size) { | |
385 | fatal_unexec("cannot write output file"); | |
386 | return (0); | |
387 | } | |
388 | ||
389 | } | |
390 | ||
391 | /* | |
392 | * OKAY TO USE MALLOC NOW | |
393 | */ | |
394 | ||
395 | /* | |
396 | * Write rest of file | |
397 | */ | |
398 | fstat(infd, &st); | |
399 | if (lseek(infd, fdatasize, L_INCR) < 0) { | |
400 | fatal_unexec("cannot seek input file"); | |
401 | return (0); | |
402 | } | |
403 | size = st.st_size - lseek(infd, 0, L_INCR); | |
404 | ||
405 | buf = malloc(size); | |
406 | if (read(infd, buf, size) != size) { | |
407 | free(buf); | |
408 | fatal_unexec("cannot read input file"); | |
409 | return (0); | |
410 | } | |
411 | if (write(outfd, buf, size) != size) { | |
412 | free(buf); | |
413 | fatal_unexec("cannot write output file"); | |
414 | return (0); | |
415 | } | |
416 | free(buf); | |
acacb292 RS |
417 | |
418 | #ifdef NS_TARGET | |
419 | /* | |
420 | * Fix up relocation entries in the data segment. | |
421 | */ | |
422 | ||
423 | if (lseek(infd, extreloff, L_SET) < 0) { | |
424 | fatal_unexec("cannot seek input file"); | |
425 | return (0); | |
426 | } | |
427 | ||
428 | for (i = 0; i < nextrel; i++) | |
429 | { | |
430 | long zeroval = 0; | |
431 | ||
432 | if (read(infd, &reloc_info, sizeof (reloc_info)) != sizeof (reloc_info)) { | |
433 | fatal_unexec("cannot read input file"); | |
434 | return (0); | |
435 | } | |
436 | if (reloc_info.r_address >= dataseg_vmaddr && reloc_info.r_address < dataseg_vmend) | |
437 | { | |
438 | if (lseek (outfd, fdatastart + reloc_info.r_address - dataseg_vmaddr, L_SET) < 0 ) { | |
439 | fatal_unexec("cannot seek input file"); | |
440 | return (0); | |
441 | } | |
442 | switch (reloc_info.r_length) { | |
443 | case 0: | |
444 | if (write(outfd, &zeroval, 1) != 1) { | |
445 | fatal_unexec("cannot write output file"); | |
446 | return (0); | |
447 | } | |
448 | break; | |
449 | case 1: | |
450 | if (write(outfd, &zeroval, 2) != 2) { | |
451 | fatal_unexec("cannot write output file"); | |
452 | return (0); | |
453 | } | |
454 | break; | |
455 | case 2: | |
456 | if (write(outfd, &zeroval, 4) != 4) { | |
457 | fatal_unexec("cannot write output file"); | |
458 | return (0); | |
459 | } | |
460 | break; | |
461 | } | |
462 | } | |
463 | } | |
464 | #endif | |
465 | ||
5743648e RS |
466 | return (1); |
467 | } | |
468 | ||
469 | void | |
470 | unexec( | |
471 | char *outfile, | |
472 | char *infile | |
473 | ) | |
474 | { | |
475 | int infd; | |
476 | int outfd; | |
477 | char tmpbuf[L_tmpnam]; | |
478 | char *tmpfile; | |
479 | ||
480 | infd = open(infile, O_RDONLY, 0); | |
481 | if (infd < 0) { | |
482 | fatal_unexec("cannot open input file `%s'", infile); | |
483 | exit(1); | |
484 | } | |
485 | ||
486 | tmpnam(tmpbuf); | |
487 | tmpfile = rindex(tmpbuf, '/'); | |
488 | if (tmpfile == NULL) { | |
489 | tmpfile = tmpbuf; | |
490 | } else { | |
491 | tmpfile++; | |
492 | } | |
493 | outfd = open(tmpfile, O_WRONLY|O_TRUNC|O_CREAT, 0755); | |
494 | if (outfd < 0) { | |
495 | close(infd); | |
496 | fatal_unexec("cannot open tmp file `%s'", tmpfile); | |
497 | exit(1); | |
498 | } | |
499 | if (!unexec_doit(infd, outfd)) { | |
500 | close(infd); | |
501 | close(outfd); | |
502 | unlink(tmpfile); | |
503 | exit(1); | |
504 | } | |
505 | close(infd); | |
506 | close(outfd); | |
507 | if (rename(tmpfile, outfile) < 0) { | |
508 | unlink(tmpfile); | |
509 | fatal_unexec("cannot rename `%s' to `%s'", tmpfile, outfile); | |
510 | exit(1); | |
511 | } | |
512 | } |