Commit | Line | Data |
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e0f712ba | 1 | /* Dump Emacs in Mach-O format for use on Mac OS X. |
aaef169d TTN |
2 | Copyright (C) 2001, 2002, 2003, 2004, 2005, |
3 | 2006 Free Software Foundation, Inc. | |
e0f712ba AC |
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 | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
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 | |
4fc5845f LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
e0f712ba AC |
21 | |
22 | /* Contributed by Andrew Choi (akochoi@mac.com). */ | |
23 | ||
24 | /* Documentation note. | |
25 | ||
26 | Consult the following documents/files for a description of the | |
27 | Mach-O format: the file loader.h, man pages for Mach-O and ld, old | |
28 | NEXTSTEP documents of the Mach-O format. The tool otool dumps the | |
29 | mach header (-h option) and the load commands (-l option) in a | |
30 | Mach-O file. The tool nm on Mac OS X displays the symbol table in | |
31 | a Mach-O file. For examples of unexec for the Mach-O format, see | |
32 | the file unexnext.c in the GNU Emacs distribution, the file | |
33 | unexdyld.c in the Darwin port of GNU Emacs 20.7, and unexdyld.c in | |
34 | the Darwin port of XEmacs 21.1. Also the Darwin Libc source | |
35 | contains the source code for malloc_freezedry and malloc_jumpstart. | |
36 | Read that to see what they do. This file was written completely | |
37 | from scratch, making use of information from the above sources. */ | |
38 | ||
39 | /* The Mac OS X implementation of unexec makes use of Darwin's `zone' | |
40 | memory allocator. All calls to malloc, realloc, and free in Emacs | |
41 | are redirected to unexec_malloc, unexec_realloc, and unexec_free in | |
42 | this file. When temacs is run, all memory requests are handled in | |
43 | the zone EmacsZone. The Darwin memory allocator library calls | |
44 | maintain the data structures to manage this zone. Dumping writes | |
45 | its contents to data segments of the executable file. When emacs | |
46 | is run, the loader recreates the contents of the zone in memory. | |
47 | However since the initialization routine of the zone memory | |
48 | allocator is run again, this `zone' can no longer be used as a | |
49 | heap. That is why emacs uses the ordinary malloc system call to | |
50 | allocate memory. Also, when a block of memory needs to be | |
51 | reallocated and the new size is larger than the old one, a new | |
52 | block must be obtained by malloc and the old contents copied to | |
53 | it. */ | |
54 | ||
55 | /* Peculiarity of the Mach-O files generated by ld in Mac OS X | |
56 | (possible causes of future bugs if changed). | |
57 | ||
58 | The file offset of the start of the __TEXT segment is zero. Since | |
59 | the Mach header and load commands are located at the beginning of a | |
60 | Mach-O file, copying the contents of the __TEXT segment from the | |
61 | input file overwrites them in the output file. Despite this, | |
62 | unexec works fine as written below because the segment load command | |
63 | for __TEXT appears, and is therefore processed, before all other | |
64 | load commands except the segment load command for __PAGEZERO, which | |
65 | remains unchanged. | |
66 | ||
67 | Although the file offset of the start of the __TEXT segment is | |
68 | zero, none of the sections it contains actually start there. In | |
69 | fact, the earliest one starts a few hundred bytes beyond the end of | |
70 | the last load command. The linker option -headerpad controls the | |
71 | minimum size of this padding. Its setting can be changed in | |
72 | s/darwin.h. A value of 0x300, e.g., leaves room for about 15 | |
73 | additional load commands for the newly created __DATA segments (at | |
74 | 56 bytes each). Unexec fails if there is not enough room for these | |
75 | new segments. | |
76 | ||
77 | The __TEXT segment contains the sections __text, __cstring, | |
78 | __picsymbol_stub, and __const and the __DATA segment contains the | |
79 | sections __data, __la_symbol_ptr, __nl_symbol_ptr, __dyld, __bss, | |
80 | and __common. The other segments do not contain any sections. | |
81 | These sections are copied from the input file to the output file, | |
82 | except for __data, __bss, and __common, which are dumped from | |
83 | memory. The types of the sections __bss and __common are changed | |
84 | from S_ZEROFILL to S_REGULAR. Note that the number of sections and | |
85 | their relative order in the input and output files remain | |
86 | unchanged. Otherwise all n_sect fields in the nlist records in the | |
87 | symbol table (specified by the LC_SYMTAB load command) will have to | |
88 | be changed accordingly. | |
89 | */ | |
90 | ||
91 | #include <stdio.h> | |
92 | #include <stdlib.h> | |
93 | #include <fcntl.h> | |
94 | #include <stdarg.h> | |
95 | #include <sys/types.h> | |
96 | #include <unistd.h> | |
97 | #include <mach/mach.h> | |
98 | #include <mach-o/loader.h> | |
043131c4 AC |
99 | #include <mach-o/reloc.h> |
100 | #if defined (__ppc__) | |
101 | #include <mach-o/ppc/reloc.h> | |
102 | #endif | |
7f900522 YM |
103 | #include <config.h> |
104 | #undef malloc | |
105 | #undef realloc | |
106 | #undef free | |
107 | #ifdef HAVE_MALLOC_MALLOC_H | |
f7f3a65f ST |
108 | #include <malloc/malloc.h> |
109 | #else | |
e0f712ba | 110 | #include <objc/malloc.h> |
f7f3a65f ST |
111 | #endif |
112 | ||
40ef0695 YM |
113 | #include <assert.h> |
114 | ||
e0f712ba AC |
115 | |
116 | #define VERBOSE 1 | |
117 | ||
118 | /* Size of buffer used to copy data from the input file to the output | |
119 | file in function unexec_copy. */ | |
120 | #define UNEXEC_COPY_BUFSZ 1024 | |
121 | ||
122 | /* Regions with memory addresses above this value are assumed to be | |
123 | mapped to dynamically loaded libraries and will not be dumped. */ | |
124 | #define VM_DATA_TOP (20 * 1024 * 1024) | |
125 | ||
126 | /* Used by malloc_freezedry and malloc_jumpstart. */ | |
127 | int malloc_cookie; | |
128 | ||
129 | /* Type of an element on the list of regions to be dumped. */ | |
130 | struct region_t { | |
131 | vm_address_t address; | |
132 | vm_size_t size; | |
133 | vm_prot_t protection; | |
134 | vm_prot_t max_protection; | |
135 | ||
136 | struct region_t *next; | |
137 | }; | |
138 | ||
139 | /* Head and tail of the list of regions to be dumped. */ | |
140 | struct region_t *region_list_head = 0; | |
141 | struct region_t *region_list_tail = 0; | |
142 | ||
143 | /* Pointer to array of load commands. */ | |
144 | struct load_command **lca; | |
145 | ||
146 | /* Number of load commands. */ | |
147 | int nlc; | |
148 | ||
149 | /* The highest VM address of segments loaded by the input file. | |
150 | Regions with addresses beyond this are assumed to be allocated | |
151 | dynamically and thus require dumping. */ | |
152 | vm_address_t infile_lc_highest_addr = 0; | |
153 | ||
154 | /* The lowest file offset used by the all sections in the __TEXT | |
155 | segments. This leaves room at the beginning of the file to store | |
156 | the Mach-O header. Check this value against header size to ensure | |
157 | the added load commands for the new __DATA segments did not | |
158 | overwrite any of the sections in the __TEXT segment. */ | |
159 | unsigned long text_seg_lowest_offset = 0x10000000; | |
160 | ||
161 | /* Mach header. */ | |
162 | struct mach_header mh; | |
163 | ||
164 | /* Offset at which the next load command should be written. */ | |
165 | unsigned long curr_header_offset = sizeof (struct mach_header); | |
166 | ||
167 | /* Current adjustment that needs to be made to offset values because | |
168 | of additional data segments. */ | |
169 | unsigned long delta = 0; | |
170 | ||
171 | int infd, outfd; | |
172 | ||
173 | int in_dumped_exec = 0; | |
174 | ||
175 | malloc_zone_t *emacs_zone; | |
176 | ||
043131c4 AC |
177 | /* file offset of input file's data segment */ |
178 | off_t data_segment_old_fileoff; | |
179 | ||
180 | struct segment_command *data_segment_scp; | |
181 | ||
433456d7 | 182 | /* Read N bytes from infd into memory starting at address DEST. |
e0f712ba AC |
183 | Return true if successful, false otherwise. */ |
184 | static int | |
185 | unexec_read (void *dest, size_t n) | |
186 | { | |
187 | return n == read (infd, dest, n); | |
188 | } | |
189 | ||
433456d7 YM |
190 | /* Write COUNT bytes from memory starting at address SRC to outfd |
191 | starting at offset DEST. Return true if successful, false | |
192 | otherwise. */ | |
e0f712ba AC |
193 | static int |
194 | unexec_write (off_t dest, const void *src, size_t count) | |
195 | { | |
196 | if (lseek (outfd, dest, SEEK_SET) != dest) | |
197 | return 0; | |
198 | ||
199 | return write (outfd, src, count) == count; | |
200 | } | |
201 | ||
433456d7 YM |
202 | /* Write COUNT bytes of zeros to outfd starting at offset DEST. |
203 | Return true if successful, false otherwise. */ | |
204 | static int | |
205 | unexec_write_zero (off_t dest, size_t count) | |
206 | { | |
207 | char buf[UNEXEC_COPY_BUFSZ]; | |
208 | ssize_t bytes; | |
209 | ||
210 | bzero (buf, UNEXEC_COPY_BUFSZ); | |
211 | if (lseek (outfd, dest, SEEK_SET) != dest) | |
212 | return 0; | |
213 | ||
214 | while (count > 0) | |
215 | { | |
216 | bytes = count > UNEXEC_COPY_BUFSZ ? UNEXEC_COPY_BUFSZ : count; | |
217 | if (write (outfd, buf, bytes) != bytes) | |
218 | return 0; | |
219 | count -= bytes; | |
220 | } | |
221 | ||
222 | return 1; | |
223 | } | |
224 | ||
225 | /* Copy COUNT bytes from starting offset SRC in infd to starting | |
226 | offset DEST in outfd. Return true if successful, false | |
227 | otherwise. */ | |
e0f712ba AC |
228 | static int |
229 | unexec_copy (off_t dest, off_t src, ssize_t count) | |
230 | { | |
231 | ssize_t bytes_read; | |
911c78b4 | 232 | ssize_t bytes_to_read; |
e0f712ba AC |
233 | |
234 | char buf[UNEXEC_COPY_BUFSZ]; | |
235 | ||
236 | if (lseek (infd, src, SEEK_SET) != src) | |
237 | return 0; | |
238 | ||
239 | if (lseek (outfd, dest, SEEK_SET) != dest) | |
240 | return 0; | |
241 | ||
242 | while (count > 0) | |
243 | { | |
911c78b4 ST |
244 | bytes_to_read = count > UNEXEC_COPY_BUFSZ ? UNEXEC_COPY_BUFSZ : count; |
245 | bytes_read = read (infd, buf, bytes_to_read); | |
e0f712ba AC |
246 | if (bytes_read <= 0) |
247 | return 0; | |
248 | if (write (outfd, buf, bytes_read) != bytes_read) | |
249 | return 0; | |
250 | count -= bytes_read; | |
251 | } | |
252 | ||
253 | return 1; | |
254 | } | |
255 | ||
256 | /* Debugging and informational messages routines. */ | |
257 | ||
258 | static void | |
259 | unexec_error (char *format, ...) | |
260 | { | |
261 | va_list ap; | |
262 | ||
263 | va_start (ap, format); | |
264 | fprintf (stderr, "unexec: "); | |
265 | vfprintf (stderr, format, ap); | |
266 | fprintf (stderr, "\n"); | |
267 | va_end (ap); | |
268 | exit (1); | |
269 | } | |
270 | ||
271 | static void | |
272 | print_prot (vm_prot_t prot) | |
273 | { | |
274 | if (prot == VM_PROT_NONE) | |
275 | printf ("none"); | |
276 | else | |
277 | { | |
278 | putchar (prot & VM_PROT_READ ? 'r' : ' '); | |
279 | putchar (prot & VM_PROT_WRITE ? 'w' : ' '); | |
280 | putchar (prot & VM_PROT_EXECUTE ? 'x' : ' '); | |
281 | putchar (' '); | |
282 | } | |
283 | } | |
284 | ||
285 | static void | |
286 | print_region (vm_address_t address, vm_size_t size, vm_prot_t prot, | |
287 | vm_prot_t max_prot) | |
288 | { | |
289 | printf ("%#10x %#8x ", address, size); | |
290 | print_prot (prot); | |
291 | putchar (' '); | |
292 | print_prot (max_prot); | |
293 | putchar ('\n'); | |
294 | } | |
295 | ||
296 | static void | |
297 | print_region_list () | |
298 | { | |
299 | struct region_t *r; | |
300 | ||
301 | printf (" address size prot maxp\n"); | |
302 | ||
303 | for (r = region_list_head; r; r = r->next) | |
304 | print_region (r->address, r->size, r->protection, r->max_protection); | |
305 | } | |
306 | ||
307 | void | |
308 | print_regions () | |
309 | { | |
310 | task_t target_task = mach_task_self (); | |
311 | vm_address_t address = (vm_address_t) 0; | |
312 | vm_size_t size; | |
313 | struct vm_region_basic_info info; | |
314 | mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT; | |
315 | mach_port_t object_name; | |
316 | ||
317 | printf (" address size prot maxp\n"); | |
318 | ||
319 | while (vm_region (target_task, &address, &size, VM_REGION_BASIC_INFO, | |
320 | (vm_region_info_t) &info, &info_count, &object_name) | |
321 | == KERN_SUCCESS && info_count == VM_REGION_BASIC_INFO_COUNT) | |
322 | { | |
323 | print_region (address, size, info.protection, info.max_protection); | |
324 | ||
325 | if (object_name != MACH_PORT_NULL) | |
326 | mach_port_deallocate (target_task, object_name); | |
177c0ea7 | 327 | |
e0f712ba AC |
328 | address += size; |
329 | } | |
330 | } | |
331 | ||
332 | /* Build the list of regions that need to be dumped. Regions with | |
333 | addresses above VM_DATA_TOP are omitted. Adjacent regions with | |
334 | identical protection are merged. Note that non-writable regions | |
335 | cannot be omitted because they some regions created at run time are | |
336 | read-only. */ | |
337 | static void | |
338 | build_region_list () | |
339 | { | |
340 | task_t target_task = mach_task_self (); | |
341 | vm_address_t address = (vm_address_t) 0; | |
342 | vm_size_t size; | |
343 | struct vm_region_basic_info info; | |
344 | mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT; | |
345 | mach_port_t object_name; | |
346 | struct region_t *r; | |
347 | ||
348 | #if VERBOSE | |
349 | printf ("--- List of All Regions ---\n"); | |
350 | printf (" address size prot maxp\n"); | |
351 | #endif | |
352 | ||
353 | while (vm_region (target_task, &address, &size, VM_REGION_BASIC_INFO, | |
354 | (vm_region_info_t) &info, &info_count, &object_name) | |
355 | == KERN_SUCCESS && info_count == VM_REGION_BASIC_INFO_COUNT) | |
356 | { | |
357 | /* Done when we reach addresses of shared libraries, which are | |
358 | loaded in high memory. */ | |
359 | if (address >= VM_DATA_TOP) | |
360 | break; | |
361 | ||
362 | #if VERBOSE | |
363 | print_region (address, size, info.protection, info.max_protection); | |
364 | #endif | |
365 | ||
366 | /* If a region immediately follows the previous one (the one | |
367 | most recently added to the list) and has identical | |
368 | protection, merge it with the latter. Otherwise create a | |
369 | new list element for it. */ | |
370 | if (region_list_tail | |
371 | && info.protection == region_list_tail->protection | |
372 | && info.max_protection == region_list_tail->max_protection | |
373 | && region_list_tail->address + region_list_tail->size == address) | |
374 | { | |
375 | region_list_tail->size += size; | |
376 | } | |
377 | else | |
378 | { | |
379 | r = (struct region_t *) malloc (sizeof (struct region_t)); | |
177c0ea7 | 380 | |
e0f712ba AC |
381 | if (!r) |
382 | unexec_error ("cannot allocate region structure"); | |
177c0ea7 | 383 | |
e0f712ba AC |
384 | r->address = address; |
385 | r->size = size; | |
386 | r->protection = info.protection; | |
387 | r->max_protection = info.max_protection; | |
177c0ea7 | 388 | |
e0f712ba AC |
389 | r->next = 0; |
390 | if (region_list_head == 0) | |
391 | { | |
392 | region_list_head = r; | |
393 | region_list_tail = r; | |
394 | } | |
395 | else | |
396 | { | |
397 | region_list_tail->next = r; | |
398 | region_list_tail = r; | |
399 | } | |
177c0ea7 | 400 | |
e0f712ba AC |
401 | /* Deallocate (unused) object name returned by |
402 | vm_region. */ | |
403 | if (object_name != MACH_PORT_NULL) | |
404 | mach_port_deallocate (target_task, object_name); | |
405 | } | |
177c0ea7 | 406 | |
e0f712ba AC |
407 | address += size; |
408 | } | |
409 | ||
410 | printf ("--- List of Regions to be Dumped ---\n"); | |
411 | print_region_list (); | |
412 | } | |
413 | ||
414 | ||
1dd7ccf2 | 415 | #define MAX_UNEXEC_REGIONS 200 |
e0f712ba AC |
416 | |
417 | int num_unexec_regions; | |
418 | vm_range_t unexec_regions[MAX_UNEXEC_REGIONS]; | |
419 | ||
420 | static void | |
421 | unexec_regions_recorder (task_t task, void *rr, unsigned type, | |
422 | vm_range_t *ranges, unsigned num) | |
423 | { | |
424 | while (num && num_unexec_regions < MAX_UNEXEC_REGIONS) | |
425 | { | |
426 | unexec_regions[num_unexec_regions++] = *ranges; | |
427 | printf ("%#8x (sz: %#8x)\n", ranges->address, ranges->size); | |
428 | ranges++; num--; | |
429 | } | |
430 | if (num_unexec_regions == MAX_UNEXEC_REGIONS) | |
431 | fprintf (stderr, "malloc_freezedry_recorder: too many regions\n"); | |
432 | } | |
433 | ||
434 | static kern_return_t | |
435 | unexec_reader (task_t task, vm_address_t address, vm_size_t size, void **ptr) | |
436 | { | |
437 | *ptr = (void *) address; | |
438 | return KERN_SUCCESS; | |
439 | } | |
440 | ||
441 | void | |
442 | find_emacs_zone_regions () | |
443 | { | |
444 | num_unexec_regions = 0; | |
445 | ||
446 | emacs_zone->introspect->enumerator (mach_task_self(), 0, | |
447 | MALLOC_PTR_REGION_RANGE_TYPE | |
448 | | MALLOC_ADMIN_REGION_RANGE_TYPE, | |
449 | (vm_address_t) emacs_zone, | |
450 | unexec_reader, | |
451 | unexec_regions_recorder); | |
452 | } | |
453 | ||
1dd7ccf2 AC |
454 | static int |
455 | unexec_regions_sort_compare (const void *a, const void *b) | |
456 | { | |
457 | vm_address_t aa = ((vm_range_t *) a)->address; | |
458 | vm_address_t bb = ((vm_range_t *) b)->address; | |
459 | ||
460 | if (aa < bb) | |
461 | return -1; | |
462 | else if (aa > bb) | |
463 | return 1; | |
464 | else | |
465 | return 0; | |
466 | } | |
467 | ||
468 | static void | |
469 | unexec_regions_merge () | |
470 | { | |
471 | int i, n; | |
472 | vm_range_t r; | |
473 | ||
474 | qsort (unexec_regions, num_unexec_regions, sizeof (unexec_regions[0]), | |
475 | &unexec_regions_sort_compare); | |
476 | n = 0; | |
477 | r = unexec_regions[0]; | |
478 | for (i = 1; i < num_unexec_regions; i++) | |
479 | { | |
480 | if (r.address + r.size == unexec_regions[i].address) | |
481 | { | |
482 | r.size += unexec_regions[i].size; | |
483 | } | |
484 | else | |
485 | { | |
486 | unexec_regions[n++] = r; | |
487 | r = unexec_regions[i]; | |
488 | } | |
489 | } | |
490 | unexec_regions[n++] = r; | |
491 | num_unexec_regions = n; | |
492 | } | |
493 | ||
e0f712ba AC |
494 | |
495 | /* More informational messages routines. */ | |
496 | ||
497 | static void | |
498 | print_load_command_name (int lc) | |
499 | { | |
500 | switch (lc) | |
501 | { | |
502 | case LC_SEGMENT: | |
503 | printf ("LC_SEGMENT "); | |
504 | break; | |
505 | case LC_LOAD_DYLINKER: | |
506 | printf ("LC_LOAD_DYLINKER "); | |
507 | break; | |
508 | case LC_LOAD_DYLIB: | |
509 | printf ("LC_LOAD_DYLIB "); | |
510 | break; | |
511 | case LC_SYMTAB: | |
512 | printf ("LC_SYMTAB "); | |
513 | break; | |
514 | case LC_DYSYMTAB: | |
515 | printf ("LC_DYSYMTAB "); | |
516 | break; | |
517 | case LC_UNIXTHREAD: | |
518 | printf ("LC_UNIXTHREAD "); | |
519 | break; | |
520 | case LC_PREBOUND_DYLIB: | |
521 | printf ("LC_PREBOUND_DYLIB"); | |
522 | break; | |
523 | case LC_TWOLEVEL_HINTS: | |
524 | printf ("LC_TWOLEVEL_HINTS"); | |
525 | break; | |
526 | default: | |
527 | printf ("unknown "); | |
528 | } | |
529 | } | |
530 | ||
531 | static void | |
532 | print_load_command (struct load_command *lc) | |
533 | { | |
534 | print_load_command_name (lc->cmd); | |
535 | printf ("%8d", lc->cmdsize); | |
536 | ||
537 | if (lc->cmd == LC_SEGMENT) | |
538 | { | |
539 | struct segment_command *scp; | |
540 | struct section *sectp; | |
541 | int j; | |
542 | ||
543 | scp = (struct segment_command *) lc; | |
544 | printf (" %-16.16s %#10x %#8x\n", | |
545 | scp->segname, scp->vmaddr, scp->vmsize); | |
546 | ||
547 | sectp = (struct section *) (scp + 1); | |
548 | for (j = 0; j < scp->nsects; j++) | |
549 | { | |
550 | printf (" %-16.16s %#10x %#8x\n", | |
551 | sectp->sectname, sectp->addr, sectp->size); | |
552 | sectp++; | |
553 | } | |
554 | } | |
555 | else | |
556 | printf ("\n"); | |
557 | } | |
558 | ||
559 | /* Read header and load commands from input file. Store the latter in | |
560 | the global array lca. Store the total number of load commands in | |
561 | global variable nlc. */ | |
562 | static void | |
563 | read_load_commands () | |
564 | { | |
7f900522 | 565 | int i; |
e0f712ba AC |
566 | |
567 | if (!unexec_read (&mh, sizeof (struct mach_header))) | |
568 | unexec_error ("cannot read mach-o header"); | |
569 | ||
570 | if (mh.magic != MH_MAGIC) | |
571 | unexec_error ("input file not in Mach-O format"); | |
572 | ||
573 | if (mh.filetype != MH_EXECUTE) | |
574 | unexec_error ("input Mach-O file is not an executable object file"); | |
575 | ||
576 | #if VERBOSE | |
577 | printf ("--- Header Information ---\n"); | |
578 | printf ("Magic = 0x%08x\n", mh.magic); | |
579 | printf ("CPUType = %d\n", mh.cputype); | |
580 | printf ("CPUSubType = %d\n", mh.cpusubtype); | |
581 | printf ("FileType = 0x%x\n", mh.filetype); | |
582 | printf ("NCmds = %d\n", mh.ncmds); | |
583 | printf ("SizeOfCmds = %d\n", mh.sizeofcmds); | |
584 | printf ("Flags = 0x%08x\n", mh.flags); | |
585 | #endif | |
586 | ||
587 | nlc = mh.ncmds; | |
588 | lca = (struct load_command **) malloc (nlc * sizeof (struct load_command *)); | |
177c0ea7 | 589 | |
e0f712ba AC |
590 | for (i = 0; i < nlc; i++) |
591 | { | |
592 | struct load_command lc; | |
593 | /* Load commands are variable-size: so read the command type and | |
594 | size first and then read the rest. */ | |
595 | if (!unexec_read (&lc, sizeof (struct load_command))) | |
596 | unexec_error ("cannot read load command"); | |
597 | lca[i] = (struct load_command *) malloc (lc.cmdsize); | |
598 | memcpy (lca[i], &lc, sizeof (struct load_command)); | |
599 | if (!unexec_read (lca[i] + 1, lc.cmdsize - sizeof (struct load_command))) | |
600 | unexec_error ("cannot read content of load command"); | |
601 | if (lc.cmd == LC_SEGMENT) | |
602 | { | |
603 | struct segment_command *scp = (struct segment_command *) lca[i]; | |
177c0ea7 | 604 | |
e0f712ba AC |
605 | if (scp->vmaddr + scp->vmsize > infile_lc_highest_addr) |
606 | infile_lc_highest_addr = scp->vmaddr + scp->vmsize; | |
607 | ||
608 | if (strncmp (scp->segname, SEG_TEXT, 16) == 0) | |
609 | { | |
610 | struct section *sectp = (struct section *) (scp + 1); | |
611 | int j; | |
612 | ||
613 | for (j = 0; j < scp->nsects; j++) | |
614 | if (sectp->offset < text_seg_lowest_offset) | |
615 | text_seg_lowest_offset = sectp->offset; | |
616 | } | |
617 | } | |
618 | } | |
619 | ||
620 | printf ("Highest address of load commands in input file: %#8x\n", | |
621 | infile_lc_highest_addr); | |
622 | ||
623 | printf ("Lowest offset of all sections in __TEXT segment: %#8x\n", | |
624 | text_seg_lowest_offset); | |
625 | ||
626 | printf ("--- List of Load Commands in Input File ---\n"); | |
627 | printf ("# cmd cmdsize name address size\n"); | |
628 | ||
629 | for (i = 0; i < nlc; i++) | |
630 | { | |
631 | printf ("%1d ", i); | |
632 | print_load_command (lca[i]); | |
633 | } | |
634 | } | |
635 | ||
636 | /* Copy a LC_SEGMENT load command other than the __DATA segment from | |
637 | the input file to the output file, adjusting the file offset of the | |
638 | segment and the file offsets of sections contained in it. */ | |
639 | static void | |
640 | copy_segment (struct load_command *lc) | |
641 | { | |
642 | struct segment_command *scp = (struct segment_command *) lc; | |
643 | unsigned long old_fileoff = scp->fileoff; | |
644 | struct section *sectp; | |
645 | int j; | |
646 | ||
647 | scp->fileoff += delta; | |
648 | ||
649 | sectp = (struct section *) (scp + 1); | |
650 | for (j = 0; j < scp->nsects; j++) | |
651 | { | |
652 | sectp->offset += delta; | |
653 | sectp++; | |
654 | } | |
655 | ||
656 | printf ("Writing segment %-16.16s at %#8x - %#8x (sz: %#8x)\n", | |
657 | scp->segname, scp->fileoff, scp->fileoff + scp->filesize, | |
658 | scp->filesize); | |
659 | ||
660 | if (!unexec_copy (scp->fileoff, old_fileoff, scp->filesize)) | |
661 | unexec_error ("cannot copy segment from input to output file"); | |
662 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
663 | unexec_error ("cannot write load command to header"); | |
664 | ||
665 | curr_header_offset += lc->cmdsize; | |
666 | } | |
667 | ||
668 | /* Copy a LC_SEGMENT load command for the __DATA segment in the input | |
669 | file to the output file. We assume that only one such segment load | |
670 | command exists in the input file and it contains the sections | |
671 | __data, __bss, __common, __la_symbol_ptr, __nl_symbol_ptr, and | |
672 | __dyld. The first three of these should be dumped from memory and | |
673 | the rest should be copied from the input file. Note that the | |
674 | sections __bss and __common contain no data in the input file | |
675 | because their flag fields have the value S_ZEROFILL. Dumping these | |
676 | from memory makes it necessary to adjust file offset fields in | |
677 | subsequently dumped load commands. Then, create new __DATA segment | |
678 | load commands for regions on the region list other than the one | |
679 | corresponding to the __DATA segment in the input file. */ | |
680 | static void | |
681 | copy_data_segment (struct load_command *lc) | |
682 | { | |
683 | struct segment_command *scp = (struct segment_command *) lc; | |
684 | struct section *sectp; | |
685 | int j; | |
686 | unsigned long header_offset, file_offset, old_file_offset; | |
e0f712ba AC |
687 | |
688 | printf ("Writing segment %-16.16s at %#8x - %#8x (sz: %#8x)\n", | |
689 | scp->segname, scp->fileoff, scp->fileoff + scp->filesize, | |
690 | scp->filesize); | |
691 | ||
692 | if (delta != 0) | |
693 | unexec_error ("cannot handle multiple DATA segments in input file"); | |
694 | ||
695 | /* Offsets in the output file for writing the next section structure | |
696 | and segment data block, respectively. */ | |
697 | header_offset = curr_header_offset + sizeof (struct segment_command); | |
698 | ||
699 | sectp = (struct section *) (scp + 1); | |
700 | for (j = 0; j < scp->nsects; j++) | |
701 | { | |
702 | old_file_offset = sectp->offset; | |
703 | sectp->offset = sectp->addr - scp->vmaddr + scp->fileoff; | |
704 | /* The __data section is dumped from memory. The __bss and | |
705 | __common sections are also dumped from memory but their flag | |
706 | fields require changing (from S_ZEROFILL to S_REGULAR). The | |
707 | other three kinds of sections are just copied from the input | |
708 | file. */ | |
709 | if (strncmp (sectp->sectname, SECT_DATA, 16) == 0) | |
710 | { | |
711 | if (!unexec_write (sectp->offset, (void *) sectp->addr, sectp->size)) | |
712 | unexec_error ("cannot write section %s", SECT_DATA); | |
713 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) | |
714 | unexec_error ("cannot write section %s's header", SECT_DATA); | |
715 | } | |
433456d7 | 716 | else if (strncmp (sectp->sectname, SECT_COMMON, 16) == 0) |
e0f712ba AC |
717 | { |
718 | sectp->flags = S_REGULAR; | |
719 | if (!unexec_write (sectp->offset, (void *) sectp->addr, sectp->size)) | |
433456d7 | 720 | unexec_error ("cannot write section %s", sectp->sectname); |
e0f712ba | 721 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) |
433456d7 YM |
722 | unexec_error ("cannot write section %s's header", sectp->sectname); |
723 | } | |
724 | else if (strncmp (sectp->sectname, SECT_BSS, 16) == 0) | |
725 | { | |
726 | extern char *my_endbss_static; | |
727 | unsigned long my_size; | |
728 | ||
729 | sectp->flags = S_REGULAR; | |
730 | ||
731 | /* Clear uninitialized local variables in statically linked | |
732 | libraries. In particular, function pointers stored by | |
733 | libSystemStub.a, which is introduced in Mac OS X 10.4 for | |
734 | binary compatibility with respect to long double, are | |
735 | cleared so that they will be reinitialized when the | |
736 | dumped binary is executed on other versions of OS. */ | |
737 | my_size = (unsigned long)my_endbss_static - sectp->addr; | |
738 | if (!(sectp->addr <= (unsigned long)my_endbss_static | |
739 | && my_size <= sectp->size)) | |
740 | unexec_error ("my_endbss_static is not in section %s", | |
741 | sectp->sectname); | |
742 | if (!unexec_write (sectp->offset, (void *) sectp->addr, my_size)) | |
743 | unexec_error ("cannot write section %s", sectp->sectname); | |
744 | if (!unexec_write_zero (sectp->offset + my_size, | |
745 | sectp->size - my_size)) | |
746 | unexec_error ("cannot write section %s", sectp->sectname); | |
747 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) | |
748 | unexec_error ("cannot write section %s's header", sectp->sectname); | |
e0f712ba AC |
749 | } |
750 | else if (strncmp (sectp->sectname, "__la_symbol_ptr", 16) == 0 | |
751 | || strncmp (sectp->sectname, "__nl_symbol_ptr", 16) == 0 | |
427c5b1b | 752 | || strncmp (sectp->sectname, "__la_sym_ptr2", 16) == 0 |
e0f712ba | 753 | || strncmp (sectp->sectname, "__dyld", 16) == 0 |
7290a344 AC |
754 | || strncmp (sectp->sectname, "__const", 16) == 0 |
755 | || strncmp (sectp->sectname, "__cfstring", 16) == 0) | |
e0f712ba AC |
756 | { |
757 | if (!unexec_copy (sectp->offset, old_file_offset, sectp->size)) | |
758 | unexec_error ("cannot copy section %s", sectp->sectname); | |
759 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) | |
760 | unexec_error ("cannot write section %s's header", sectp->sectname); | |
761 | } | |
762 | else | |
763 | unexec_error ("unrecognized section name in __DATA segment"); | |
177c0ea7 | 764 | |
e0f712ba AC |
765 | printf (" section %-16.16s at %#8x - %#8x (sz: %#8x)\n", |
766 | sectp->sectname, sectp->offset, sectp->offset + sectp->size, | |
767 | sectp->size); | |
768 | ||
769 | header_offset += sizeof (struct section); | |
770 | sectp++; | |
771 | } | |
772 | ||
773 | /* The new filesize of the segment is set to its vmsize because data | |
774 | blocks for segments must start at region boundaries. Note that | |
775 | this may leave unused locations at the end of the segment data | |
776 | block because the total of the sizes of all sections in the | |
777 | segment is generally smaller than vmsize. */ | |
778 | delta = scp->vmsize - scp->filesize; | |
779 | scp->filesize = scp->vmsize; | |
780 | if (!unexec_write (curr_header_offset, scp, sizeof (struct segment_command))) | |
781 | unexec_error ("cannot write header of __DATA segment"); | |
782 | curr_header_offset += lc->cmdsize; | |
783 | ||
784 | /* Create new __DATA segment load commands for regions on the region | |
785 | list that do not corresponding to any segment load commands in | |
786 | the input file. | |
787 | */ | |
788 | file_offset = scp->fileoff + scp->filesize; | |
789 | for (j = 0; j < num_unexec_regions; j++) | |
790 | { | |
791 | struct segment_command sc; | |
177c0ea7 | 792 | |
e0f712ba AC |
793 | sc.cmd = LC_SEGMENT; |
794 | sc.cmdsize = sizeof (struct segment_command); | |
795 | strncpy (sc.segname, SEG_DATA, 16); | |
796 | sc.vmaddr = unexec_regions[j].address; | |
797 | sc.vmsize = unexec_regions[j].size; | |
798 | sc.fileoff = file_offset; | |
799 | sc.filesize = unexec_regions[j].size; | |
800 | sc.maxprot = VM_PROT_READ | VM_PROT_WRITE; | |
801 | sc.initprot = VM_PROT_READ | VM_PROT_WRITE; | |
802 | sc.nsects = 0; | |
803 | sc.flags = 0; | |
177c0ea7 | 804 | |
e0f712ba AC |
805 | printf ("Writing segment %-16.16s at %#8x - %#8x (sz: %#8x)\n", |
806 | sc.segname, sc.fileoff, sc.fileoff + sc.filesize, | |
807 | sc.filesize); | |
808 | ||
809 | if (!unexec_write (sc.fileoff, (void *) sc.vmaddr, sc.vmsize)) | |
810 | unexec_error ("cannot write new __DATA segment"); | |
811 | delta += sc.filesize; | |
812 | file_offset += sc.filesize; | |
177c0ea7 | 813 | |
e0f712ba AC |
814 | if (!unexec_write (curr_header_offset, &sc, sc.cmdsize)) |
815 | unexec_error ("cannot write new __DATA segment's header"); | |
816 | curr_header_offset += sc.cmdsize; | |
817 | mh.ncmds++; | |
818 | } | |
819 | } | |
820 | ||
821 | /* Copy a LC_SYMTAB load command from the input file to the output | |
822 | file, adjusting the file offset fields. */ | |
823 | static void | |
824 | copy_symtab (struct load_command *lc) | |
825 | { | |
826 | struct symtab_command *stp = (struct symtab_command *) lc; | |
827 | ||
828 | stp->symoff += delta; | |
829 | stp->stroff += delta; | |
830 | ||
831 | printf ("Writing LC_SYMTAB command\n"); | |
832 | ||
833 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
834 | unexec_error ("cannot write symtab command to header"); | |
835 | ||
836 | curr_header_offset += lc->cmdsize; | |
837 | } | |
838 | ||
043131c4 AC |
839 | /* Fix up relocation entries. */ |
840 | static void | |
841 | unrelocate (const char *name, off_t reloff, int nrel) | |
842 | { | |
843 | int i, unreloc_count; | |
844 | struct relocation_info reloc_info; | |
845 | struct scattered_relocation_info *sc_reloc_info | |
846 | = (struct scattered_relocation_info *) &reloc_info; | |
847 | ||
848 | for (unreloc_count = 0, i = 0; i < nrel; i++) | |
849 | { | |
850 | if (lseek (infd, reloff, L_SET) != reloff) | |
851 | unexec_error ("unrelocate: %s:%d cannot seek to reloc_info", name, i); | |
852 | if (!unexec_read (&reloc_info, sizeof (reloc_info))) | |
853 | unexec_error ("unrelocate: %s:%d cannot read reloc_info", name, i); | |
854 | reloff += sizeof (reloc_info); | |
855 | ||
856 | if (sc_reloc_info->r_scattered == 0) | |
857 | switch (reloc_info.r_type) | |
858 | { | |
859 | case GENERIC_RELOC_VANILLA: | |
860 | if (reloc_info.r_address >= data_segment_scp->vmaddr | |
861 | && reloc_info.r_address < (data_segment_scp->vmaddr | |
862 | + data_segment_scp->vmsize)) | |
863 | { | |
864 | off_t src_off = data_segment_old_fileoff | |
865 | + reloc_info.r_address - data_segment_scp->vmaddr; | |
866 | off_t dst_off = data_segment_scp->fileoff | |
867 | + reloc_info.r_address - data_segment_scp->vmaddr; | |
868 | ||
869 | if (!unexec_copy (dst_off, src_off, 1 << reloc_info.r_length)) | |
870 | unexec_error ("unrelocate: %s:%d cannot copy original value", | |
871 | name, i); | |
872 | unreloc_count++; | |
873 | } | |
874 | break; | |
875 | default: | |
876 | unexec_error ("unrelocate: %s:%d cannot handle type = %d", | |
877 | name, i, reloc_info.r_type); | |
878 | } | |
879 | else | |
880 | switch (sc_reloc_info->r_type) | |
881 | { | |
882 | #if defined (__ppc__) | |
883 | case PPC_RELOC_PB_LA_PTR: | |
884 | /* nothing to do for prebound lazy pointer */ | |
885 | break; | |
886 | #endif | |
887 | default: | |
888 | unexec_error ("unrelocate: %s:%d cannot handle scattered type = %d", | |
889 | name, i, sc_reloc_info->r_type); | |
890 | } | |
891 | } | |
892 | ||
893 | if (nrel > 0) | |
894 | printf ("Fixed up %d/%d %s relocation entries in data segment.\n", | |
895 | unreloc_count, nrel, name); | |
896 | } | |
897 | ||
e0f712ba AC |
898 | /* Copy a LC_DYSYMTAB load command from the input file to the output |
899 | file, adjusting the file offset fields. */ | |
900 | static void | |
901 | copy_dysymtab (struct load_command *lc) | |
902 | { | |
903 | struct dysymtab_command *dstp = (struct dysymtab_command *) lc; | |
904 | ||
043131c4 AC |
905 | unrelocate ("local", dstp->locreloff, dstp->nlocrel); |
906 | unrelocate ("external", dstp->extreloff, dstp->nextrel); | |
e0f712ba AC |
907 | |
908 | if (dstp->nextrel > 0) { | |
909 | dstp->extreloff += delta; | |
910 | } | |
911 | ||
912 | if (dstp->nlocrel > 0) { | |
913 | dstp->locreloff += delta; | |
914 | } | |
915 | ||
916 | if (dstp->nindirectsyms > 0) | |
917 | dstp->indirectsymoff += delta; | |
918 | ||
919 | printf ("Writing LC_DYSYMTAB command\n"); | |
920 | ||
921 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
922 | unexec_error ("cannot write symtab command to header"); | |
923 | ||
924 | curr_header_offset += lc->cmdsize; | |
925 | } | |
926 | ||
40e6ff95 ST |
927 | /* Copy a LC_TWOLEVEL_HINTS load command from the input file to the output |
928 | file, adjusting the file offset fields. */ | |
929 | static void | |
930 | copy_twolevelhints (struct load_command *lc) | |
931 | { | |
932 | struct twolevel_hints_command *tlhp = (struct twolevel_hints_command *) lc; | |
933 | ||
934 | if (tlhp->nhints > 0) { | |
935 | tlhp->offset += delta; | |
936 | } | |
937 | ||
938 | printf ("Writing LC_TWOLEVEL_HINTS command\n"); | |
939 | ||
940 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
941 | unexec_error ("cannot write two level hint command to header"); | |
942 | ||
943 | curr_header_offset += lc->cmdsize; | |
944 | } | |
945 | ||
e0f712ba AC |
946 | /* Copy other kinds of load commands from the input file to the output |
947 | file, ones that do not require adjustments of file offsets. */ | |
948 | static void | |
949 | copy_other (struct load_command *lc) | |
950 | { | |
951 | printf ("Writing "); | |
952 | print_load_command_name (lc->cmd); | |
953 | printf (" command\n"); | |
954 | ||
955 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
956 | unexec_error ("cannot write symtab command to header"); | |
957 | ||
958 | curr_header_offset += lc->cmdsize; | |
959 | } | |
960 | ||
961 | /* Loop through all load commands and dump them. Then write the Mach | |
962 | header. */ | |
963 | static void | |
964 | dump_it () | |
965 | { | |
966 | int i; | |
967 | ||
968 | printf ("--- Load Commands written to Output File ---\n"); | |
969 | ||
970 | for (i = 0; i < nlc; i++) | |
971 | switch (lca[i]->cmd) | |
972 | { | |
973 | case LC_SEGMENT: | |
974 | { | |
975 | struct segment_command *scp = (struct segment_command *) lca[i]; | |
976 | if (strncmp (scp->segname, SEG_DATA, 16) == 0) | |
977 | { | |
043131c4 AC |
978 | /* save data segment file offset and segment_command for |
979 | unrelocate */ | |
980 | data_segment_old_fileoff = scp->fileoff; | |
981 | data_segment_scp = scp; | |
982 | ||
e0f712ba AC |
983 | copy_data_segment (lca[i]); |
984 | } | |
985 | else | |
986 | { | |
987 | copy_segment (lca[i]); | |
988 | } | |
989 | } | |
990 | break; | |
991 | case LC_SYMTAB: | |
992 | copy_symtab (lca[i]); | |
993 | break; | |
994 | case LC_DYSYMTAB: | |
995 | copy_dysymtab (lca[i]); | |
996 | break; | |
40e6ff95 ST |
997 | case LC_TWOLEVEL_HINTS: |
998 | copy_twolevelhints (lca[i]); | |
999 | break; | |
e0f712ba AC |
1000 | default: |
1001 | copy_other (lca[i]); | |
1002 | break; | |
1003 | } | |
1004 | ||
1005 | if (curr_header_offset > text_seg_lowest_offset) | |
1006 | unexec_error ("not enough room for load commands for new __DATA segments"); | |
1007 | ||
1008 | printf ("%d unused bytes follow Mach-O header\n", | |
1009 | text_seg_lowest_offset - curr_header_offset); | |
1010 | ||
1011 | mh.sizeofcmds = curr_header_offset - sizeof (struct mach_header); | |
1012 | if (!unexec_write (0, &mh, sizeof (struct mach_header))) | |
1013 | unexec_error ("cannot write final header contents"); | |
1014 | } | |
1015 | ||
1016 | /* Take a snapshot of Emacs and make a Mach-O format executable file | |
1017 | from it. The file names of the output and input files are outfile | |
1018 | and infile, respectively. The three other parameters are | |
1019 | ignored. */ | |
1020 | void | |
1021 | unexec (char *outfile, char *infile, void *start_data, void *start_bss, | |
1022 | void *entry_address) | |
1023 | { | |
6dc5c8a7 YM |
1024 | if (in_dumped_exec) |
1025 | unexec_error ("Unexec from a dumped executable is not supported."); | |
1026 | ||
e0f712ba AC |
1027 | infd = open (infile, O_RDONLY, 0); |
1028 | if (infd < 0) | |
1029 | { | |
1030 | unexec_error ("cannot open input file `%s'", infile); | |
1031 | } | |
177c0ea7 | 1032 | |
e0f712ba AC |
1033 | outfd = open (outfile, O_WRONLY | O_TRUNC | O_CREAT, 0755); |
1034 | if (outfd < 0) | |
1035 | { | |
1036 | close (infd); | |
1037 | unexec_error ("cannot open output file `%s'", outfile); | |
1038 | } | |
1039 | ||
1040 | build_region_list (); | |
1041 | read_load_commands (); | |
1042 | ||
1043 | find_emacs_zone_regions (); | |
1dd7ccf2 | 1044 | unexec_regions_merge (); |
e0f712ba AC |
1045 | |
1046 | in_dumped_exec = 1; | |
1047 | ||
1048 | dump_it (); | |
1049 | ||
1050 | close (outfd); | |
1051 | } | |
1052 | ||
1053 | ||
1054 | void | |
1055 | unexec_init_emacs_zone () | |
1056 | { | |
1057 | emacs_zone = malloc_create_zone (0, 0); | |
1058 | malloc_set_zone_name (emacs_zone, "EmacsZone"); | |
1059 | } | |
1060 | ||
40ef0695 YM |
1061 | #ifndef MACOSX_MALLOC_MULT16 |
1062 | #define MACOSX_MALLOC_MULT16 1 | |
1063 | #endif | |
1064 | ||
1065 | typedef struct unexec_malloc_header { | |
1066 | union { | |
1067 | char c[8]; | |
1068 | size_t size; | |
1069 | } u; | |
1070 | } unexec_malloc_header_t; | |
1071 | ||
1072 | #if MACOSX_MALLOC_MULT16 | |
1073 | ||
1074 | #define ptr_in_unexec_regions(p) ((((vm_address_t) (p)) & 8) != 0) | |
1075 | ||
1076 | #else | |
1077 | ||
e0f712ba AC |
1078 | int |
1079 | ptr_in_unexec_regions (void *ptr) | |
1080 | { | |
1081 | int i; | |
1082 | ||
1083 | for (i = 0; i < num_unexec_regions; i++) | |
1084 | if ((vm_address_t) ptr - unexec_regions[i].address | |
1085 | < unexec_regions[i].size) | |
1086 | return 1; | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
40ef0695 YM |
1091 | #endif |
1092 | ||
e0f712ba AC |
1093 | void * |
1094 | unexec_malloc (size_t size) | |
1095 | { | |
1096 | if (in_dumped_exec) | |
40ef0695 YM |
1097 | { |
1098 | void *p; | |
1099 | ||
1100 | p = malloc (size); | |
1101 | #if MACOSX_MALLOC_MULT16 | |
1102 | assert (((vm_address_t) p % 16) == 0); | |
1103 | #endif | |
1104 | return p; | |
1105 | } | |
e0f712ba | 1106 | else |
40ef0695 YM |
1107 | { |
1108 | unexec_malloc_header_t *ptr; | |
1109 | ||
1110 | ptr = (unexec_malloc_header_t *) | |
1111 | malloc_zone_malloc (emacs_zone, size + sizeof (unexec_malloc_header_t)); | |
1112 | ptr->u.size = size; | |
1113 | ptr++; | |
1114 | #if MACOSX_MALLOC_MULT16 | |
1115 | assert (((vm_address_t) ptr % 16) == 8); | |
1116 | #endif | |
1117 | return (void *) ptr; | |
1118 | } | |
e0f712ba AC |
1119 | } |
1120 | ||
1121 | void * | |
1122 | unexec_realloc (void *old_ptr, size_t new_size) | |
1123 | { | |
1124 | if (in_dumped_exec) | |
40ef0695 YM |
1125 | { |
1126 | void *p; | |
1127 | ||
1128 | if (ptr_in_unexec_regions (old_ptr)) | |
1129 | { | |
40ef0695 YM |
1130 | size_t old_size = ((unexec_malloc_header_t *) old_ptr)[-1].u.size; |
1131 | size_t size = new_size > old_size ? old_size : new_size; | |
1132 | ||
0da46b6e | 1133 | p = (size_t *) malloc (new_size); |
40ef0695 YM |
1134 | if (size) |
1135 | memcpy (p, old_ptr, size); | |
1136 | } | |
1137 | else | |
1138 | { | |
1139 | p = realloc (old_ptr, new_size); | |
1140 | } | |
1141 | #if MACOSX_MALLOC_MULT16 | |
1142 | assert (((vm_address_t) p % 16) == 0); | |
1143 | #endif | |
1144 | return p; | |
1145 | } | |
e0f712ba | 1146 | else |
40ef0695 YM |
1147 | { |
1148 | unexec_malloc_header_t *ptr; | |
1149 | ||
1150 | ptr = (unexec_malloc_header_t *) | |
1151 | malloc_zone_realloc (emacs_zone, (unexec_malloc_header_t *) old_ptr - 1, | |
1152 | new_size + sizeof (unexec_malloc_header_t)); | |
1153 | ptr->u.size = new_size; | |
1154 | ptr++; | |
1155 | #if MACOSX_MALLOC_MULT16 | |
1156 | assert (((vm_address_t) ptr % 16) == 8); | |
1157 | #endif | |
1158 | return (void *) ptr; | |
1159 | } | |
e0f712ba AC |
1160 | } |
1161 | ||
1162 | void | |
1163 | unexec_free (void *ptr) | |
1164 | { | |
1165 | if (in_dumped_exec) | |
1166 | { | |
1167 | if (!ptr_in_unexec_regions (ptr)) | |
1168 | free (ptr); | |
1169 | } | |
1170 | else | |
40ef0695 | 1171 | malloc_zone_free (emacs_zone, (unexec_malloc_header_t *) ptr - 1); |
e0f712ba | 1172 | } |
ab5796a9 MB |
1173 | |
1174 | /* arch-tag: 1a784f7b-a184-4c4f-9544-da8619593d72 | |
1175 | (do not change this comment) */ |