Commit | Line | Data |
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e0f712ba | 1 | /* Dump Emacs in Mach-O format for use on Mac OS X. |
aaef169d | 2 | Copyright (C) 2001, 2002, 2003, 2004, 2005, |
4e6835db | 3 | 2006, 2007 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 | |
c57038f8 YM |
72 | s/darwin.h. A value of 0x690, e.g., leaves room for 30 additional |
73 | load commands for the newly created __DATA segments (at 56 bytes | |
74 | each). Unexec fails if there is not enough room for these new | |
75 | segments. | |
e0f712ba AC |
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 | ||
73da71f9 YM |
115 | #ifdef _LP64 |
116 | #define mach_header mach_header_64 | |
117 | #define segment_command segment_command_64 | |
118 | #undef VM_REGION_BASIC_INFO_COUNT | |
119 | #define VM_REGION_BASIC_INFO_COUNT VM_REGION_BASIC_INFO_COUNT_64 | |
120 | #undef VM_REGION_BASIC_INFO | |
121 | #define VM_REGION_BASIC_INFO VM_REGION_BASIC_INFO_64 | |
122 | #undef LC_SEGMENT | |
123 | #define LC_SEGMENT LC_SEGMENT_64 | |
124 | #define vm_region vm_region_64 | |
125 | #define section section_64 | |
126 | #undef MH_MAGIC | |
127 | #define MH_MAGIC MH_MAGIC_64 | |
128 | #endif | |
e0f712ba AC |
129 | |
130 | #define VERBOSE 1 | |
131 | ||
132 | /* Size of buffer used to copy data from the input file to the output | |
133 | file in function unexec_copy. */ | |
134 | #define UNEXEC_COPY_BUFSZ 1024 | |
135 | ||
136 | /* Regions with memory addresses above this value are assumed to be | |
137 | mapped to dynamically loaded libraries and will not be dumped. */ | |
138 | #define VM_DATA_TOP (20 * 1024 * 1024) | |
139 | ||
e0f712ba AC |
140 | /* Type of an element on the list of regions to be dumped. */ |
141 | struct region_t { | |
142 | vm_address_t address; | |
143 | vm_size_t size; | |
144 | vm_prot_t protection; | |
145 | vm_prot_t max_protection; | |
146 | ||
147 | struct region_t *next; | |
148 | }; | |
149 | ||
150 | /* Head and tail of the list of regions to be dumped. */ | |
c57038f8 YM |
151 | static struct region_t *region_list_head = 0; |
152 | static struct region_t *region_list_tail = 0; | |
e0f712ba AC |
153 | |
154 | /* Pointer to array of load commands. */ | |
c57038f8 | 155 | static struct load_command **lca; |
e0f712ba AC |
156 | |
157 | /* Number of load commands. */ | |
c57038f8 | 158 | static int nlc; |
e0f712ba AC |
159 | |
160 | /* The highest VM address of segments loaded by the input file. | |
161 | Regions with addresses beyond this are assumed to be allocated | |
162 | dynamically and thus require dumping. */ | |
c57038f8 | 163 | static vm_address_t infile_lc_highest_addr = 0; |
e0f712ba AC |
164 | |
165 | /* The lowest file offset used by the all sections in the __TEXT | |
166 | segments. This leaves room at the beginning of the file to store | |
167 | the Mach-O header. Check this value against header size to ensure | |
168 | the added load commands for the new __DATA segments did not | |
169 | overwrite any of the sections in the __TEXT segment. */ | |
c57038f8 | 170 | static unsigned long text_seg_lowest_offset = 0x10000000; |
e0f712ba AC |
171 | |
172 | /* Mach header. */ | |
c57038f8 | 173 | static struct mach_header mh; |
e0f712ba AC |
174 | |
175 | /* Offset at which the next load command should be written. */ | |
c57038f8 | 176 | static unsigned long curr_header_offset = sizeof (struct mach_header); |
e0f712ba | 177 | |
73da71f9 YM |
178 | /* Offset at which the next segment should be written. */ |
179 | static unsigned long curr_file_offset = 0; | |
180 | ||
181 | static unsigned long pagesize; | |
182 | #define ROUNDUP_TO_PAGE_BOUNDARY(x) (((x) + pagesize - 1) & ~(pagesize - 1)) | |
e0f712ba | 183 | |
c57038f8 | 184 | static int infd, outfd; |
e0f712ba | 185 | |
c57038f8 | 186 | static int in_dumped_exec = 0; |
e0f712ba | 187 | |
c57038f8 | 188 | static malloc_zone_t *emacs_zone; |
e0f712ba | 189 | |
043131c4 | 190 | /* file offset of input file's data segment */ |
c57038f8 | 191 | static off_t data_segment_old_fileoff = 0; |
043131c4 | 192 | |
c57038f8 | 193 | static struct segment_command *data_segment_scp; |
043131c4 | 194 | |
433456d7 | 195 | /* Read N bytes from infd into memory starting at address DEST. |
e0f712ba AC |
196 | Return true if successful, false otherwise. */ |
197 | static int | |
198 | unexec_read (void *dest, size_t n) | |
199 | { | |
200 | return n == read (infd, dest, n); | |
201 | } | |
202 | ||
433456d7 YM |
203 | /* Write COUNT bytes from memory starting at address SRC to outfd |
204 | starting at offset DEST. Return true if successful, false | |
205 | otherwise. */ | |
e0f712ba AC |
206 | static int |
207 | unexec_write (off_t dest, const void *src, size_t count) | |
208 | { | |
209 | if (lseek (outfd, dest, SEEK_SET) != dest) | |
210 | return 0; | |
211 | ||
212 | return write (outfd, src, count) == count; | |
213 | } | |
214 | ||
433456d7 YM |
215 | /* Write COUNT bytes of zeros to outfd starting at offset DEST. |
216 | Return true if successful, false otherwise. */ | |
217 | static int | |
218 | unexec_write_zero (off_t dest, size_t count) | |
219 | { | |
220 | char buf[UNEXEC_COPY_BUFSZ]; | |
221 | ssize_t bytes; | |
222 | ||
223 | bzero (buf, UNEXEC_COPY_BUFSZ); | |
224 | if (lseek (outfd, dest, SEEK_SET) != dest) | |
225 | return 0; | |
226 | ||
227 | while (count > 0) | |
228 | { | |
229 | bytes = count > UNEXEC_COPY_BUFSZ ? UNEXEC_COPY_BUFSZ : count; | |
230 | if (write (outfd, buf, bytes) != bytes) | |
231 | return 0; | |
232 | count -= bytes; | |
233 | } | |
234 | ||
235 | return 1; | |
236 | } | |
237 | ||
238 | /* Copy COUNT bytes from starting offset SRC in infd to starting | |
239 | offset DEST in outfd. Return true if successful, false | |
240 | otherwise. */ | |
e0f712ba AC |
241 | static int |
242 | unexec_copy (off_t dest, off_t src, ssize_t count) | |
243 | { | |
244 | ssize_t bytes_read; | |
911c78b4 | 245 | ssize_t bytes_to_read; |
e0f712ba AC |
246 | |
247 | char buf[UNEXEC_COPY_BUFSZ]; | |
248 | ||
249 | if (lseek (infd, src, SEEK_SET) != src) | |
250 | return 0; | |
251 | ||
252 | if (lseek (outfd, dest, SEEK_SET) != dest) | |
253 | return 0; | |
254 | ||
255 | while (count > 0) | |
256 | { | |
911c78b4 ST |
257 | bytes_to_read = count > UNEXEC_COPY_BUFSZ ? UNEXEC_COPY_BUFSZ : count; |
258 | bytes_read = read (infd, buf, bytes_to_read); | |
e0f712ba AC |
259 | if (bytes_read <= 0) |
260 | return 0; | |
261 | if (write (outfd, buf, bytes_read) != bytes_read) | |
262 | return 0; | |
263 | count -= bytes_read; | |
264 | } | |
265 | ||
266 | return 1; | |
267 | } | |
268 | ||
269 | /* Debugging and informational messages routines. */ | |
270 | ||
271 | static void | |
272 | unexec_error (char *format, ...) | |
273 | { | |
274 | va_list ap; | |
275 | ||
276 | va_start (ap, format); | |
277 | fprintf (stderr, "unexec: "); | |
278 | vfprintf (stderr, format, ap); | |
279 | fprintf (stderr, "\n"); | |
280 | va_end (ap); | |
281 | exit (1); | |
282 | } | |
283 | ||
284 | static void | |
285 | print_prot (vm_prot_t prot) | |
286 | { | |
287 | if (prot == VM_PROT_NONE) | |
288 | printf ("none"); | |
289 | else | |
290 | { | |
291 | putchar (prot & VM_PROT_READ ? 'r' : ' '); | |
292 | putchar (prot & VM_PROT_WRITE ? 'w' : ' '); | |
293 | putchar (prot & VM_PROT_EXECUTE ? 'x' : ' '); | |
294 | putchar (' '); | |
295 | } | |
296 | } | |
297 | ||
298 | static void | |
299 | print_region (vm_address_t address, vm_size_t size, vm_prot_t prot, | |
300 | vm_prot_t max_prot) | |
301 | { | |
73da71f9 | 302 | printf ("%#10lx %#8lx ", (long) address, (long) size); |
e0f712ba AC |
303 | print_prot (prot); |
304 | putchar (' '); | |
305 | print_prot (max_prot); | |
306 | putchar ('\n'); | |
307 | } | |
308 | ||
309 | static void | |
310 | print_region_list () | |
311 | { | |
312 | struct region_t *r; | |
313 | ||
314 | printf (" address size prot maxp\n"); | |
315 | ||
316 | for (r = region_list_head; r; r = r->next) | |
317 | print_region (r->address, r->size, r->protection, r->max_protection); | |
318 | } | |
319 | ||
c57038f8 | 320 | static void |
e0f712ba AC |
321 | print_regions () |
322 | { | |
323 | task_t target_task = mach_task_self (); | |
324 | vm_address_t address = (vm_address_t) 0; | |
325 | vm_size_t size; | |
326 | struct vm_region_basic_info info; | |
327 | mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT; | |
328 | mach_port_t object_name; | |
329 | ||
330 | printf (" address size prot maxp\n"); | |
331 | ||
332 | while (vm_region (target_task, &address, &size, VM_REGION_BASIC_INFO, | |
333 | (vm_region_info_t) &info, &info_count, &object_name) | |
334 | == KERN_SUCCESS && info_count == VM_REGION_BASIC_INFO_COUNT) | |
335 | { | |
336 | print_region (address, size, info.protection, info.max_protection); | |
337 | ||
338 | if (object_name != MACH_PORT_NULL) | |
339 | mach_port_deallocate (target_task, object_name); | |
177c0ea7 | 340 | |
e0f712ba AC |
341 | address += size; |
342 | } | |
343 | } | |
344 | ||
345 | /* Build the list of regions that need to be dumped. Regions with | |
346 | addresses above VM_DATA_TOP are omitted. Adjacent regions with | |
347 | identical protection are merged. Note that non-writable regions | |
348 | cannot be omitted because they some regions created at run time are | |
349 | read-only. */ | |
350 | static void | |
351 | build_region_list () | |
352 | { | |
353 | task_t target_task = mach_task_self (); | |
354 | vm_address_t address = (vm_address_t) 0; | |
355 | vm_size_t size; | |
356 | struct vm_region_basic_info info; | |
357 | mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT; | |
358 | mach_port_t object_name; | |
359 | struct region_t *r; | |
360 | ||
361 | #if VERBOSE | |
362 | printf ("--- List of All Regions ---\n"); | |
363 | printf (" address size prot maxp\n"); | |
364 | #endif | |
365 | ||
366 | while (vm_region (target_task, &address, &size, VM_REGION_BASIC_INFO, | |
367 | (vm_region_info_t) &info, &info_count, &object_name) | |
368 | == KERN_SUCCESS && info_count == VM_REGION_BASIC_INFO_COUNT) | |
369 | { | |
370 | /* Done when we reach addresses of shared libraries, which are | |
371 | loaded in high memory. */ | |
372 | if (address >= VM_DATA_TOP) | |
373 | break; | |
374 | ||
375 | #if VERBOSE | |
376 | print_region (address, size, info.protection, info.max_protection); | |
377 | #endif | |
378 | ||
379 | /* If a region immediately follows the previous one (the one | |
380 | most recently added to the list) and has identical | |
381 | protection, merge it with the latter. Otherwise create a | |
382 | new list element for it. */ | |
383 | if (region_list_tail | |
384 | && info.protection == region_list_tail->protection | |
385 | && info.max_protection == region_list_tail->max_protection | |
386 | && region_list_tail->address + region_list_tail->size == address) | |
387 | { | |
388 | region_list_tail->size += size; | |
389 | } | |
390 | else | |
391 | { | |
392 | r = (struct region_t *) malloc (sizeof (struct region_t)); | |
177c0ea7 | 393 | |
e0f712ba AC |
394 | if (!r) |
395 | unexec_error ("cannot allocate region structure"); | |
177c0ea7 | 396 | |
e0f712ba AC |
397 | r->address = address; |
398 | r->size = size; | |
399 | r->protection = info.protection; | |
400 | r->max_protection = info.max_protection; | |
177c0ea7 | 401 | |
e0f712ba AC |
402 | r->next = 0; |
403 | if (region_list_head == 0) | |
404 | { | |
405 | region_list_head = r; | |
406 | region_list_tail = r; | |
407 | } | |
408 | else | |
409 | { | |
410 | region_list_tail->next = r; | |
411 | region_list_tail = r; | |
412 | } | |
177c0ea7 | 413 | |
e0f712ba AC |
414 | /* Deallocate (unused) object name returned by |
415 | vm_region. */ | |
416 | if (object_name != MACH_PORT_NULL) | |
417 | mach_port_deallocate (target_task, object_name); | |
418 | } | |
177c0ea7 | 419 | |
e0f712ba AC |
420 | address += size; |
421 | } | |
422 | ||
423 | printf ("--- List of Regions to be Dumped ---\n"); | |
424 | print_region_list (); | |
425 | } | |
426 | ||
427 | ||
73da71f9 | 428 | #define MAX_UNEXEC_REGIONS 400 |
e0f712ba | 429 | |
c57038f8 YM |
430 | static int num_unexec_regions; |
431 | typedef struct { | |
432 | vm_range_t range; | |
433 | vm_size_t filesize; | |
434 | } unexec_region_info; | |
435 | static unexec_region_info unexec_regions[MAX_UNEXEC_REGIONS]; | |
e0f712ba AC |
436 | |
437 | static void | |
438 | unexec_regions_recorder (task_t task, void *rr, unsigned type, | |
439 | vm_range_t *ranges, unsigned num) | |
440 | { | |
c57038f8 YM |
441 | vm_address_t p; |
442 | vm_size_t filesize; | |
443 | ||
e0f712ba AC |
444 | while (num && num_unexec_regions < MAX_UNEXEC_REGIONS) |
445 | { | |
c57038f8 YM |
446 | /* Subtract the size of trailing null pages from filesize. It |
447 | can be smaller than vmsize in segment commands. In such a | |
448 | case, trailing pages are initialized with zeros. */ | |
449 | for (p = ranges->address + ranges->size; p > ranges->address; | |
450 | p -= sizeof (int)) | |
451 | if (*(((int *) p)-1)) | |
452 | break; | |
453 | filesize = ROUNDUP_TO_PAGE_BOUNDARY (p - ranges->address); | |
454 | assert (filesize <= ranges->size); | |
455 | ||
456 | unexec_regions[num_unexec_regions].filesize = filesize; | |
457 | unexec_regions[num_unexec_regions++].range = *ranges; | |
458 | printf ("%#10lx (sz: %#8lx/%#8lx)\n", (long) (ranges->address), | |
459 | (long) filesize, (long) (ranges->size)); | |
e0f712ba AC |
460 | ranges++; num--; |
461 | } | |
e0f712ba AC |
462 | } |
463 | ||
464 | static kern_return_t | |
465 | unexec_reader (task_t task, vm_address_t address, vm_size_t size, void **ptr) | |
466 | { | |
467 | *ptr = (void *) address; | |
468 | return KERN_SUCCESS; | |
469 | } | |
470 | ||
c57038f8 | 471 | static void |
e0f712ba AC |
472 | find_emacs_zone_regions () |
473 | { | |
474 | num_unexec_regions = 0; | |
475 | ||
476 | emacs_zone->introspect->enumerator (mach_task_self(), 0, | |
477 | MALLOC_PTR_REGION_RANGE_TYPE | |
478 | | MALLOC_ADMIN_REGION_RANGE_TYPE, | |
479 | (vm_address_t) emacs_zone, | |
480 | unexec_reader, | |
481 | unexec_regions_recorder); | |
73da71f9 YM |
482 | |
483 | if (num_unexec_regions == MAX_UNEXEC_REGIONS) | |
484 | unexec_error ("find_emacs_zone_regions: too many regions"); | |
e0f712ba AC |
485 | } |
486 | ||
1dd7ccf2 AC |
487 | static int |
488 | unexec_regions_sort_compare (const void *a, const void *b) | |
489 | { | |
c57038f8 YM |
490 | vm_address_t aa = ((unexec_region_info *) a)->range.address; |
491 | vm_address_t bb = ((unexec_region_info *) b)->range.address; | |
1dd7ccf2 AC |
492 | |
493 | if (aa < bb) | |
494 | return -1; | |
495 | else if (aa > bb) | |
496 | return 1; | |
497 | else | |
498 | return 0; | |
499 | } | |
500 | ||
501 | static void | |
502 | unexec_regions_merge () | |
503 | { | |
504 | int i, n; | |
c57038f8 | 505 | unexec_region_info r; |
1dd7ccf2 AC |
506 | |
507 | qsort (unexec_regions, num_unexec_regions, sizeof (unexec_regions[0]), | |
508 | &unexec_regions_sort_compare); | |
509 | n = 0; | |
510 | r = unexec_regions[0]; | |
511 | for (i = 1; i < num_unexec_regions; i++) | |
512 | { | |
c57038f8 YM |
513 | if (r.range.address + r.range.size == unexec_regions[i].range.address |
514 | && r.range.size - r.filesize < 2 * pagesize) | |
1dd7ccf2 | 515 | { |
c57038f8 YM |
516 | r.filesize = r.range.size + unexec_regions[i].filesize; |
517 | r.range.size += unexec_regions[i].range.size; | |
1dd7ccf2 AC |
518 | } |
519 | else | |
520 | { | |
521 | unexec_regions[n++] = r; | |
522 | r = unexec_regions[i]; | |
523 | } | |
524 | } | |
525 | unexec_regions[n++] = r; | |
526 | num_unexec_regions = n; | |
527 | } | |
528 | ||
e0f712ba AC |
529 | |
530 | /* More informational messages routines. */ | |
531 | ||
532 | static void | |
533 | print_load_command_name (int lc) | |
534 | { | |
535 | switch (lc) | |
536 | { | |
537 | case LC_SEGMENT: | |
73da71f9 | 538 | #ifndef _LP64 |
e0f712ba | 539 | printf ("LC_SEGMENT "); |
73da71f9 YM |
540 | #else |
541 | printf ("LC_SEGMENT_64 "); | |
542 | #endif | |
e0f712ba AC |
543 | break; |
544 | case LC_LOAD_DYLINKER: | |
545 | printf ("LC_LOAD_DYLINKER "); | |
546 | break; | |
547 | case LC_LOAD_DYLIB: | |
548 | printf ("LC_LOAD_DYLIB "); | |
549 | break; | |
550 | case LC_SYMTAB: | |
551 | printf ("LC_SYMTAB "); | |
552 | break; | |
553 | case LC_DYSYMTAB: | |
554 | printf ("LC_DYSYMTAB "); | |
555 | break; | |
556 | case LC_UNIXTHREAD: | |
557 | printf ("LC_UNIXTHREAD "); | |
558 | break; | |
559 | case LC_PREBOUND_DYLIB: | |
560 | printf ("LC_PREBOUND_DYLIB"); | |
561 | break; | |
562 | case LC_TWOLEVEL_HINTS: | |
563 | printf ("LC_TWOLEVEL_HINTS"); | |
564 | break; | |
565 | default: | |
566 | printf ("unknown "); | |
567 | } | |
568 | } | |
569 | ||
570 | static void | |
571 | print_load_command (struct load_command *lc) | |
572 | { | |
573 | print_load_command_name (lc->cmd); | |
574 | printf ("%8d", lc->cmdsize); | |
575 | ||
576 | if (lc->cmd == LC_SEGMENT) | |
577 | { | |
578 | struct segment_command *scp; | |
579 | struct section *sectp; | |
580 | int j; | |
581 | ||
582 | scp = (struct segment_command *) lc; | |
73da71f9 YM |
583 | printf (" %-16.16s %#10lx %#8lx\n", |
584 | scp->segname, (long) (scp->vmaddr), (long) (scp->vmsize)); | |
e0f712ba AC |
585 | |
586 | sectp = (struct section *) (scp + 1); | |
587 | for (j = 0; j < scp->nsects; j++) | |
588 | { | |
73da71f9 YM |
589 | printf (" %-16.16s %#10lx %#8lx\n", |
590 | sectp->sectname, (long) (sectp->addr), (long) (sectp->size)); | |
e0f712ba AC |
591 | sectp++; |
592 | } | |
593 | } | |
594 | else | |
595 | printf ("\n"); | |
596 | } | |
597 | ||
598 | /* Read header and load commands from input file. Store the latter in | |
599 | the global array lca. Store the total number of load commands in | |
600 | global variable nlc. */ | |
601 | static void | |
602 | read_load_commands () | |
603 | { | |
7f900522 | 604 | int i; |
e0f712ba AC |
605 | |
606 | if (!unexec_read (&mh, sizeof (struct mach_header))) | |
607 | unexec_error ("cannot read mach-o header"); | |
608 | ||
609 | if (mh.magic != MH_MAGIC) | |
610 | unexec_error ("input file not in Mach-O format"); | |
611 | ||
612 | if (mh.filetype != MH_EXECUTE) | |
613 | unexec_error ("input Mach-O file is not an executable object file"); | |
614 | ||
615 | #if VERBOSE | |
616 | printf ("--- Header Information ---\n"); | |
617 | printf ("Magic = 0x%08x\n", mh.magic); | |
618 | printf ("CPUType = %d\n", mh.cputype); | |
619 | printf ("CPUSubType = %d\n", mh.cpusubtype); | |
620 | printf ("FileType = 0x%x\n", mh.filetype); | |
621 | printf ("NCmds = %d\n", mh.ncmds); | |
622 | printf ("SizeOfCmds = %d\n", mh.sizeofcmds); | |
623 | printf ("Flags = 0x%08x\n", mh.flags); | |
624 | #endif | |
625 | ||
626 | nlc = mh.ncmds; | |
627 | lca = (struct load_command **) malloc (nlc * sizeof (struct load_command *)); | |
177c0ea7 | 628 | |
e0f712ba AC |
629 | for (i = 0; i < nlc; i++) |
630 | { | |
631 | struct load_command lc; | |
632 | /* Load commands are variable-size: so read the command type and | |
633 | size first and then read the rest. */ | |
634 | if (!unexec_read (&lc, sizeof (struct load_command))) | |
635 | unexec_error ("cannot read load command"); | |
636 | lca[i] = (struct load_command *) malloc (lc.cmdsize); | |
637 | memcpy (lca[i], &lc, sizeof (struct load_command)); | |
638 | if (!unexec_read (lca[i] + 1, lc.cmdsize - sizeof (struct load_command))) | |
639 | unexec_error ("cannot read content of load command"); | |
640 | if (lc.cmd == LC_SEGMENT) | |
641 | { | |
642 | struct segment_command *scp = (struct segment_command *) lca[i]; | |
177c0ea7 | 643 | |
e0f712ba AC |
644 | if (scp->vmaddr + scp->vmsize > infile_lc_highest_addr) |
645 | infile_lc_highest_addr = scp->vmaddr + scp->vmsize; | |
646 | ||
647 | if (strncmp (scp->segname, SEG_TEXT, 16) == 0) | |
648 | { | |
649 | struct section *sectp = (struct section *) (scp + 1); | |
650 | int j; | |
651 | ||
652 | for (j = 0; j < scp->nsects; j++) | |
653 | if (sectp->offset < text_seg_lowest_offset) | |
654 | text_seg_lowest_offset = sectp->offset; | |
655 | } | |
656 | } | |
657 | } | |
658 | ||
659 | printf ("Highest address of load commands in input file: %#8x\n", | |
660 | infile_lc_highest_addr); | |
661 | ||
c57038f8 | 662 | printf ("Lowest offset of all sections in __TEXT segment: %#8lx\n", |
e0f712ba AC |
663 | text_seg_lowest_offset); |
664 | ||
665 | printf ("--- List of Load Commands in Input File ---\n"); | |
666 | printf ("# cmd cmdsize name address size\n"); | |
667 | ||
668 | for (i = 0; i < nlc; i++) | |
669 | { | |
670 | printf ("%1d ", i); | |
671 | print_load_command (lca[i]); | |
672 | } | |
673 | } | |
674 | ||
675 | /* Copy a LC_SEGMENT load command other than the __DATA segment from | |
676 | the input file to the output file, adjusting the file offset of the | |
677 | segment and the file offsets of sections contained in it. */ | |
678 | static void | |
679 | copy_segment (struct load_command *lc) | |
680 | { | |
681 | struct segment_command *scp = (struct segment_command *) lc; | |
682 | unsigned long old_fileoff = scp->fileoff; | |
683 | struct section *sectp; | |
684 | int j; | |
685 | ||
73da71f9 | 686 | scp->fileoff = curr_file_offset; |
e0f712ba AC |
687 | |
688 | sectp = (struct section *) (scp + 1); | |
689 | for (j = 0; j < scp->nsects; j++) | |
690 | { | |
73da71f9 | 691 | sectp->offset += curr_file_offset - old_fileoff; |
e0f712ba AC |
692 | sectp++; |
693 | } | |
694 | ||
c57038f8 YM |
695 | printf ("Writing segment %-16.16s @ %#8lx (%#8lx/%#8lx @ %#10lx)\n", |
696 | scp->segname, (long) (scp->fileoff), (long) (scp->filesize), | |
697 | (long) (scp->vmsize), (long) (scp->vmaddr)); | |
e0f712ba AC |
698 | |
699 | if (!unexec_copy (scp->fileoff, old_fileoff, scp->filesize)) | |
700 | unexec_error ("cannot copy segment from input to output file"); | |
73da71f9 YM |
701 | curr_file_offset += ROUNDUP_TO_PAGE_BOUNDARY (scp->filesize); |
702 | ||
e0f712ba AC |
703 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) |
704 | unexec_error ("cannot write load command to header"); | |
705 | ||
706 | curr_header_offset += lc->cmdsize; | |
707 | } | |
708 | ||
709 | /* Copy a LC_SEGMENT load command for the __DATA segment in the input | |
710 | file to the output file. We assume that only one such segment load | |
711 | command exists in the input file and it contains the sections | |
712 | __data, __bss, __common, __la_symbol_ptr, __nl_symbol_ptr, and | |
713 | __dyld. The first three of these should be dumped from memory and | |
714 | the rest should be copied from the input file. Note that the | |
715 | sections __bss and __common contain no data in the input file | |
716 | because their flag fields have the value S_ZEROFILL. Dumping these | |
717 | from memory makes it necessary to adjust file offset fields in | |
718 | subsequently dumped load commands. Then, create new __DATA segment | |
719 | load commands for regions on the region list other than the one | |
720 | corresponding to the __DATA segment in the input file. */ | |
721 | static void | |
722 | copy_data_segment (struct load_command *lc) | |
723 | { | |
724 | struct segment_command *scp = (struct segment_command *) lc; | |
725 | struct section *sectp; | |
726 | int j; | |
c57038f8 YM |
727 | unsigned long header_offset, old_file_offset; |
728 | ||
729 | /* The new filesize of the segment is set to its vmsize because data | |
730 | blocks for segments must start at region boundaries. Note that | |
731 | this may leave unused locations at the end of the segment data | |
732 | block because the total of the sizes of all sections in the | |
733 | segment is generally smaller than vmsize. */ | |
734 | scp->filesize = scp->vmsize; | |
e0f712ba | 735 | |
c57038f8 YM |
736 | printf ("Writing segment %-16.16s @ %#8lx (%#8lx/%#8lx @ %#10lx)\n", |
737 | scp->segname, curr_file_offset, (long)(scp->filesize), | |
738 | (long)(scp->vmsize), (long) (scp->vmaddr)); | |
e0f712ba AC |
739 | |
740 | /* Offsets in the output file for writing the next section structure | |
741 | and segment data block, respectively. */ | |
742 | header_offset = curr_header_offset + sizeof (struct segment_command); | |
743 | ||
744 | sectp = (struct section *) (scp + 1); | |
745 | for (j = 0; j < scp->nsects; j++) | |
746 | { | |
747 | old_file_offset = sectp->offset; | |
73da71f9 | 748 | sectp->offset = sectp->addr - scp->vmaddr + curr_file_offset; |
e0f712ba AC |
749 | /* The __data section is dumped from memory. The __bss and |
750 | __common sections are also dumped from memory but their flag | |
751 | fields require changing (from S_ZEROFILL to S_REGULAR). The | |
752 | other three kinds of sections are just copied from the input | |
753 | file. */ | |
754 | if (strncmp (sectp->sectname, SECT_DATA, 16) == 0) | |
755 | { | |
756 | if (!unexec_write (sectp->offset, (void *) sectp->addr, sectp->size)) | |
757 | unexec_error ("cannot write section %s", SECT_DATA); | |
758 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) | |
759 | unexec_error ("cannot write section %s's header", SECT_DATA); | |
760 | } | |
433456d7 | 761 | else if (strncmp (sectp->sectname, SECT_COMMON, 16) == 0) |
e0f712ba AC |
762 | { |
763 | sectp->flags = S_REGULAR; | |
764 | if (!unexec_write (sectp->offset, (void *) sectp->addr, sectp->size)) | |
433456d7 | 765 | unexec_error ("cannot write section %s", sectp->sectname); |
e0f712ba | 766 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) |
433456d7 YM |
767 | unexec_error ("cannot write section %s's header", sectp->sectname); |
768 | } | |
769 | else if (strncmp (sectp->sectname, SECT_BSS, 16) == 0) | |
770 | { | |
771 | extern char *my_endbss_static; | |
772 | unsigned long my_size; | |
773 | ||
774 | sectp->flags = S_REGULAR; | |
775 | ||
776 | /* Clear uninitialized local variables in statically linked | |
777 | libraries. In particular, function pointers stored by | |
778 | libSystemStub.a, which is introduced in Mac OS X 10.4 for | |
779 | binary compatibility with respect to long double, are | |
780 | cleared so that they will be reinitialized when the | |
781 | dumped binary is executed on other versions of OS. */ | |
782 | my_size = (unsigned long)my_endbss_static - sectp->addr; | |
783 | if (!(sectp->addr <= (unsigned long)my_endbss_static | |
784 | && my_size <= sectp->size)) | |
785 | unexec_error ("my_endbss_static is not in section %s", | |
786 | sectp->sectname); | |
787 | if (!unexec_write (sectp->offset, (void *) sectp->addr, my_size)) | |
788 | unexec_error ("cannot write section %s", sectp->sectname); | |
789 | if (!unexec_write_zero (sectp->offset + my_size, | |
790 | sectp->size - my_size)) | |
791 | unexec_error ("cannot write section %s", sectp->sectname); | |
792 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) | |
793 | unexec_error ("cannot write section %s's header", sectp->sectname); | |
e0f712ba AC |
794 | } |
795 | else if (strncmp (sectp->sectname, "__la_symbol_ptr", 16) == 0 | |
796 | || strncmp (sectp->sectname, "__nl_symbol_ptr", 16) == 0 | |
427c5b1b | 797 | || strncmp (sectp->sectname, "__la_sym_ptr2", 16) == 0 |
e0f712ba | 798 | || strncmp (sectp->sectname, "__dyld", 16) == 0 |
7290a344 AC |
799 | || strncmp (sectp->sectname, "__const", 16) == 0 |
800 | || strncmp (sectp->sectname, "__cfstring", 16) == 0) | |
e0f712ba AC |
801 | { |
802 | if (!unexec_copy (sectp->offset, old_file_offset, sectp->size)) | |
803 | unexec_error ("cannot copy section %s", sectp->sectname); | |
804 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) | |
805 | unexec_error ("cannot write section %s's header", sectp->sectname); | |
806 | } | |
807 | else | |
808 | unexec_error ("unrecognized section name in __DATA segment"); | |
177c0ea7 | 809 | |
73da71f9 YM |
810 | printf (" section %-16.16s at %#8lx - %#8lx (sz: %#8lx)\n", |
811 | sectp->sectname, (long) (sectp->offset), | |
812 | (long) (sectp->offset + sectp->size), (long) (sectp->size)); | |
e0f712ba AC |
813 | |
814 | header_offset += sizeof (struct section); | |
815 | sectp++; | |
816 | } | |
817 | ||
c57038f8 YM |
818 | curr_file_offset += ROUNDUP_TO_PAGE_BOUNDARY (scp->filesize); |
819 | ||
e0f712ba AC |
820 | if (!unexec_write (curr_header_offset, scp, sizeof (struct segment_command))) |
821 | unexec_error ("cannot write header of __DATA segment"); | |
822 | curr_header_offset += lc->cmdsize; | |
823 | ||
824 | /* Create new __DATA segment load commands for regions on the region | |
825 | list that do not corresponding to any segment load commands in | |
826 | the input file. | |
73da71f9 | 827 | */ |
e0f712ba AC |
828 | for (j = 0; j < num_unexec_regions; j++) |
829 | { | |
830 | struct segment_command sc; | |
177c0ea7 | 831 | |
e0f712ba AC |
832 | sc.cmd = LC_SEGMENT; |
833 | sc.cmdsize = sizeof (struct segment_command); | |
834 | strncpy (sc.segname, SEG_DATA, 16); | |
c57038f8 YM |
835 | sc.vmaddr = unexec_regions[j].range.address; |
836 | sc.vmsize = unexec_regions[j].range.size; | |
73da71f9 | 837 | sc.fileoff = curr_file_offset; |
c57038f8 | 838 | sc.filesize = unexec_regions[j].filesize; |
e0f712ba AC |
839 | sc.maxprot = VM_PROT_READ | VM_PROT_WRITE; |
840 | sc.initprot = VM_PROT_READ | VM_PROT_WRITE; | |
841 | sc.nsects = 0; | |
842 | sc.flags = 0; | |
177c0ea7 | 843 | |
c57038f8 YM |
844 | printf ("Writing segment %-16.16s @ %#8lx (%#8lx/%#8lx @ %#10lx)\n", |
845 | sc.segname, (long) (sc.fileoff), (long) (sc.filesize), | |
846 | (long) (sc.vmsize), (long) (sc.vmaddr)); | |
e0f712ba | 847 | |
c57038f8 | 848 | if (!unexec_write (sc.fileoff, (void *) sc.vmaddr, sc.filesize)) |
e0f712ba | 849 | unexec_error ("cannot write new __DATA segment"); |
73da71f9 | 850 | curr_file_offset += ROUNDUP_TO_PAGE_BOUNDARY (sc.filesize); |
177c0ea7 | 851 | |
e0f712ba AC |
852 | if (!unexec_write (curr_header_offset, &sc, sc.cmdsize)) |
853 | unexec_error ("cannot write new __DATA segment's header"); | |
854 | curr_header_offset += sc.cmdsize; | |
855 | mh.ncmds++; | |
856 | } | |
857 | } | |
858 | ||
859 | /* Copy a LC_SYMTAB load command from the input file to the output | |
860 | file, adjusting the file offset fields. */ | |
861 | static void | |
73da71f9 | 862 | copy_symtab (struct load_command *lc, long delta) |
e0f712ba AC |
863 | { |
864 | struct symtab_command *stp = (struct symtab_command *) lc; | |
865 | ||
866 | stp->symoff += delta; | |
867 | stp->stroff += delta; | |
868 | ||
869 | printf ("Writing LC_SYMTAB command\n"); | |
870 | ||
871 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
872 | unexec_error ("cannot write symtab command to header"); | |
873 | ||
874 | curr_header_offset += lc->cmdsize; | |
875 | } | |
876 | ||
043131c4 AC |
877 | /* Fix up relocation entries. */ |
878 | static void | |
879 | unrelocate (const char *name, off_t reloff, int nrel) | |
880 | { | |
881 | int i, unreloc_count; | |
882 | struct relocation_info reloc_info; | |
883 | struct scattered_relocation_info *sc_reloc_info | |
884 | = (struct scattered_relocation_info *) &reloc_info; | |
885 | ||
886 | for (unreloc_count = 0, i = 0; i < nrel; i++) | |
887 | { | |
888 | if (lseek (infd, reloff, L_SET) != reloff) | |
889 | unexec_error ("unrelocate: %s:%d cannot seek to reloc_info", name, i); | |
890 | if (!unexec_read (&reloc_info, sizeof (reloc_info))) | |
891 | unexec_error ("unrelocate: %s:%d cannot read reloc_info", name, i); | |
892 | reloff += sizeof (reloc_info); | |
893 | ||
894 | if (sc_reloc_info->r_scattered == 0) | |
895 | switch (reloc_info.r_type) | |
896 | { | |
897 | case GENERIC_RELOC_VANILLA: | |
898 | if (reloc_info.r_address >= data_segment_scp->vmaddr | |
899 | && reloc_info.r_address < (data_segment_scp->vmaddr | |
900 | + data_segment_scp->vmsize)) | |
901 | { | |
902 | off_t src_off = data_segment_old_fileoff | |
903 | + reloc_info.r_address - data_segment_scp->vmaddr; | |
904 | off_t dst_off = data_segment_scp->fileoff | |
905 | + reloc_info.r_address - data_segment_scp->vmaddr; | |
906 | ||
907 | if (!unexec_copy (dst_off, src_off, 1 << reloc_info.r_length)) | |
908 | unexec_error ("unrelocate: %s:%d cannot copy original value", | |
909 | name, i); | |
910 | unreloc_count++; | |
911 | } | |
912 | break; | |
913 | default: | |
914 | unexec_error ("unrelocate: %s:%d cannot handle type = %d", | |
915 | name, i, reloc_info.r_type); | |
916 | } | |
917 | else | |
918 | switch (sc_reloc_info->r_type) | |
919 | { | |
920 | #if defined (__ppc__) | |
921 | case PPC_RELOC_PB_LA_PTR: | |
922 | /* nothing to do for prebound lazy pointer */ | |
923 | break; | |
924 | #endif | |
925 | default: | |
926 | unexec_error ("unrelocate: %s:%d cannot handle scattered type = %d", | |
927 | name, i, sc_reloc_info->r_type); | |
928 | } | |
929 | } | |
930 | ||
931 | if (nrel > 0) | |
932 | printf ("Fixed up %d/%d %s relocation entries in data segment.\n", | |
933 | unreloc_count, nrel, name); | |
934 | } | |
935 | ||
e0f712ba AC |
936 | /* Copy a LC_DYSYMTAB load command from the input file to the output |
937 | file, adjusting the file offset fields. */ | |
938 | static void | |
73da71f9 | 939 | copy_dysymtab (struct load_command *lc, long delta) |
e0f712ba AC |
940 | { |
941 | struct dysymtab_command *dstp = (struct dysymtab_command *) lc; | |
942 | ||
043131c4 AC |
943 | unrelocate ("local", dstp->locreloff, dstp->nlocrel); |
944 | unrelocate ("external", dstp->extreloff, dstp->nextrel); | |
e0f712ba AC |
945 | |
946 | if (dstp->nextrel > 0) { | |
947 | dstp->extreloff += delta; | |
948 | } | |
949 | ||
950 | if (dstp->nlocrel > 0) { | |
951 | dstp->locreloff += delta; | |
952 | } | |
953 | ||
954 | if (dstp->nindirectsyms > 0) | |
955 | dstp->indirectsymoff += delta; | |
956 | ||
957 | printf ("Writing LC_DYSYMTAB command\n"); | |
958 | ||
959 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
960 | unexec_error ("cannot write symtab command to header"); | |
961 | ||
962 | curr_header_offset += lc->cmdsize; | |
963 | } | |
964 | ||
40e6ff95 ST |
965 | /* Copy a LC_TWOLEVEL_HINTS load command from the input file to the output |
966 | file, adjusting the file offset fields. */ | |
967 | static void | |
73da71f9 | 968 | copy_twolevelhints (struct load_command *lc, long delta) |
40e6ff95 ST |
969 | { |
970 | struct twolevel_hints_command *tlhp = (struct twolevel_hints_command *) lc; | |
971 | ||
972 | if (tlhp->nhints > 0) { | |
973 | tlhp->offset += delta; | |
974 | } | |
975 | ||
976 | printf ("Writing LC_TWOLEVEL_HINTS command\n"); | |
977 | ||
978 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
979 | unexec_error ("cannot write two level hint command to header"); | |
980 | ||
981 | curr_header_offset += lc->cmdsize; | |
982 | } | |
983 | ||
e0f712ba AC |
984 | /* Copy other kinds of load commands from the input file to the output |
985 | file, ones that do not require adjustments of file offsets. */ | |
986 | static void | |
987 | copy_other (struct load_command *lc) | |
988 | { | |
989 | printf ("Writing "); | |
990 | print_load_command_name (lc->cmd); | |
991 | printf (" command\n"); | |
992 | ||
993 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
994 | unexec_error ("cannot write symtab command to header"); | |
995 | ||
996 | curr_header_offset += lc->cmdsize; | |
997 | } | |
998 | ||
999 | /* Loop through all load commands and dump them. Then write the Mach | |
1000 | header. */ | |
1001 | static void | |
1002 | dump_it () | |
1003 | { | |
1004 | int i; | |
73da71f9 | 1005 | long linkedit_delta = 0; |
e0f712ba AC |
1006 | |
1007 | printf ("--- Load Commands written to Output File ---\n"); | |
1008 | ||
1009 | for (i = 0; i < nlc; i++) | |
1010 | switch (lca[i]->cmd) | |
1011 | { | |
1012 | case LC_SEGMENT: | |
1013 | { | |
1014 | struct segment_command *scp = (struct segment_command *) lca[i]; | |
1015 | if (strncmp (scp->segname, SEG_DATA, 16) == 0) | |
1016 | { | |
043131c4 AC |
1017 | /* save data segment file offset and segment_command for |
1018 | unrelocate */ | |
73da71f9 YM |
1019 | if (data_segment_old_fileoff) |
1020 | unexec_error ("cannot handle multiple DATA segments" | |
1021 | " in input file"); | |
043131c4 AC |
1022 | data_segment_old_fileoff = scp->fileoff; |
1023 | data_segment_scp = scp; | |
1024 | ||
e0f712ba AC |
1025 | copy_data_segment (lca[i]); |
1026 | } | |
1027 | else | |
1028 | { | |
73da71f9 YM |
1029 | if (strncmp (scp->segname, SEG_LINKEDIT, 16) == 0) |
1030 | { | |
1031 | if (linkedit_delta) | |
1032 | unexec_error ("cannot handle multiple LINKEDIT segments" | |
1033 | " in input file"); | |
1034 | linkedit_delta = curr_file_offset - scp->fileoff; | |
1035 | } | |
1036 | ||
e0f712ba AC |
1037 | copy_segment (lca[i]); |
1038 | } | |
1039 | } | |
1040 | break; | |
1041 | case LC_SYMTAB: | |
73da71f9 | 1042 | copy_symtab (lca[i], linkedit_delta); |
e0f712ba AC |
1043 | break; |
1044 | case LC_DYSYMTAB: | |
73da71f9 | 1045 | copy_dysymtab (lca[i], linkedit_delta); |
e0f712ba | 1046 | break; |
40e6ff95 | 1047 | case LC_TWOLEVEL_HINTS: |
73da71f9 | 1048 | copy_twolevelhints (lca[i], linkedit_delta); |
40e6ff95 | 1049 | break; |
e0f712ba AC |
1050 | default: |
1051 | copy_other (lca[i]); | |
1052 | break; | |
1053 | } | |
1054 | ||
1055 | if (curr_header_offset > text_seg_lowest_offset) | |
1056 | unexec_error ("not enough room for load commands for new __DATA segments"); | |
1057 | ||
c57038f8 | 1058 | printf ("%ld unused bytes follow Mach-O header\n", |
e0f712ba AC |
1059 | text_seg_lowest_offset - curr_header_offset); |
1060 | ||
1061 | mh.sizeofcmds = curr_header_offset - sizeof (struct mach_header); | |
1062 | if (!unexec_write (0, &mh, sizeof (struct mach_header))) | |
1063 | unexec_error ("cannot write final header contents"); | |
1064 | } | |
1065 | ||
1066 | /* Take a snapshot of Emacs and make a Mach-O format executable file | |
1067 | from it. The file names of the output and input files are outfile | |
1068 | and infile, respectively. The three other parameters are | |
1069 | ignored. */ | |
1070 | void | |
1071 | unexec (char *outfile, char *infile, void *start_data, void *start_bss, | |
1072 | void *entry_address) | |
1073 | { | |
6dc5c8a7 YM |
1074 | if (in_dumped_exec) |
1075 | unexec_error ("Unexec from a dumped executable is not supported."); | |
1076 | ||
73da71f9 | 1077 | pagesize = getpagesize (); |
e0f712ba AC |
1078 | infd = open (infile, O_RDONLY, 0); |
1079 | if (infd < 0) | |
1080 | { | |
1081 | unexec_error ("cannot open input file `%s'", infile); | |
1082 | } | |
177c0ea7 | 1083 | |
e0f712ba AC |
1084 | outfd = open (outfile, O_WRONLY | O_TRUNC | O_CREAT, 0755); |
1085 | if (outfd < 0) | |
1086 | { | |
1087 | close (infd); | |
1088 | unexec_error ("cannot open output file `%s'", outfile); | |
1089 | } | |
1090 | ||
1091 | build_region_list (); | |
1092 | read_load_commands (); | |
1093 | ||
1094 | find_emacs_zone_regions (); | |
1dd7ccf2 | 1095 | unexec_regions_merge (); |
e0f712ba AC |
1096 | |
1097 | in_dumped_exec = 1; | |
1098 | ||
1099 | dump_it (); | |
1100 | ||
1101 | close (outfd); | |
1102 | } | |
1103 | ||
1104 | ||
1105 | void | |
1106 | unexec_init_emacs_zone () | |
1107 | { | |
1108 | emacs_zone = malloc_create_zone (0, 0); | |
1109 | malloc_set_zone_name (emacs_zone, "EmacsZone"); | |
1110 | } | |
1111 | ||
40ef0695 YM |
1112 | #ifndef MACOSX_MALLOC_MULT16 |
1113 | #define MACOSX_MALLOC_MULT16 1 | |
1114 | #endif | |
1115 | ||
1116 | typedef struct unexec_malloc_header { | |
1117 | union { | |
1118 | char c[8]; | |
1119 | size_t size; | |
1120 | } u; | |
1121 | } unexec_malloc_header_t; | |
1122 | ||
1123 | #if MACOSX_MALLOC_MULT16 | |
1124 | ||
1125 | #define ptr_in_unexec_regions(p) ((((vm_address_t) (p)) & 8) != 0) | |
1126 | ||
1127 | #else | |
1128 | ||
e0f712ba AC |
1129 | int |
1130 | ptr_in_unexec_regions (void *ptr) | |
1131 | { | |
1132 | int i; | |
1133 | ||
1134 | for (i = 0; i < num_unexec_regions; i++) | |
c57038f8 YM |
1135 | if ((vm_address_t) ptr - unexec_regions[i].range.address |
1136 | < unexec_regions[i].range.size) | |
e0f712ba AC |
1137 | return 1; |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
40ef0695 YM |
1142 | #endif |
1143 | ||
e0f712ba AC |
1144 | void * |
1145 | unexec_malloc (size_t size) | |
1146 | { | |
1147 | if (in_dumped_exec) | |
40ef0695 YM |
1148 | { |
1149 | void *p; | |
1150 | ||
1151 | p = malloc (size); | |
1152 | #if MACOSX_MALLOC_MULT16 | |
1153 | assert (((vm_address_t) p % 16) == 0); | |
1154 | #endif | |
1155 | return p; | |
1156 | } | |
e0f712ba | 1157 | else |
40ef0695 YM |
1158 | { |
1159 | unexec_malloc_header_t *ptr; | |
1160 | ||
1161 | ptr = (unexec_malloc_header_t *) | |
1162 | malloc_zone_malloc (emacs_zone, size + sizeof (unexec_malloc_header_t)); | |
1163 | ptr->u.size = size; | |
1164 | ptr++; | |
1165 | #if MACOSX_MALLOC_MULT16 | |
1166 | assert (((vm_address_t) ptr % 16) == 8); | |
1167 | #endif | |
1168 | return (void *) ptr; | |
1169 | } | |
e0f712ba AC |
1170 | } |
1171 | ||
1172 | void * | |
1173 | unexec_realloc (void *old_ptr, size_t new_size) | |
1174 | { | |
1175 | if (in_dumped_exec) | |
40ef0695 YM |
1176 | { |
1177 | void *p; | |
1178 | ||
1179 | if (ptr_in_unexec_regions (old_ptr)) | |
1180 | { | |
40ef0695 YM |
1181 | size_t old_size = ((unexec_malloc_header_t *) old_ptr)[-1].u.size; |
1182 | size_t size = new_size > old_size ? old_size : new_size; | |
1183 | ||
0da46b6e | 1184 | p = (size_t *) malloc (new_size); |
40ef0695 YM |
1185 | if (size) |
1186 | memcpy (p, old_ptr, size); | |
1187 | } | |
1188 | else | |
1189 | { | |
1190 | p = realloc (old_ptr, new_size); | |
1191 | } | |
1192 | #if MACOSX_MALLOC_MULT16 | |
1193 | assert (((vm_address_t) p % 16) == 0); | |
1194 | #endif | |
1195 | return p; | |
1196 | } | |
e0f712ba | 1197 | else |
40ef0695 YM |
1198 | { |
1199 | unexec_malloc_header_t *ptr; | |
1200 | ||
1201 | ptr = (unexec_malloc_header_t *) | |
1202 | malloc_zone_realloc (emacs_zone, (unexec_malloc_header_t *) old_ptr - 1, | |
1203 | new_size + sizeof (unexec_malloc_header_t)); | |
1204 | ptr->u.size = new_size; | |
1205 | ptr++; | |
1206 | #if MACOSX_MALLOC_MULT16 | |
1207 | assert (((vm_address_t) ptr % 16) == 8); | |
1208 | #endif | |
1209 | return (void *) ptr; | |
1210 | } | |
e0f712ba AC |
1211 | } |
1212 | ||
1213 | void | |
1214 | unexec_free (void *ptr) | |
1215 | { | |
1216 | if (in_dumped_exec) | |
1217 | { | |
1218 | if (!ptr_in_unexec_regions (ptr)) | |
1219 | free (ptr); | |
1220 | } | |
1221 | else | |
40ef0695 | 1222 | malloc_zone_free (emacs_zone, (unexec_malloc_header_t *) ptr - 1); |
e0f712ba | 1223 | } |
ab5796a9 MB |
1224 | |
1225 | /* arch-tag: 1a784f7b-a184-4c4f-9544-da8619593d72 | |
1226 | (do not change this comment) */ |