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, |
5df4f04c | 3 | 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
e0f712ba AC |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
9ec0b715 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
e0f712ba | 8 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
e0f712ba AC |
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 | |
9ec0b715 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
e0f712ba AC |
19 | |
20 | /* Contributed by Andrew Choi (akochoi@mac.com). */ | |
21 | ||
22 | /* Documentation note. | |
23 | ||
24 | Consult the following documents/files for a description of the | |
25 | Mach-O format: the file loader.h, man pages for Mach-O and ld, old | |
26 | NEXTSTEP documents of the Mach-O format. The tool otool dumps the | |
27 | mach header (-h option) and the load commands (-l option) in a | |
28 | Mach-O file. The tool nm on Mac OS X displays the symbol table in | |
29 | a Mach-O file. For examples of unexec for the Mach-O format, see | |
30 | the file unexnext.c in the GNU Emacs distribution, the file | |
31 | unexdyld.c in the Darwin port of GNU Emacs 20.7, and unexdyld.c in | |
32 | the Darwin port of XEmacs 21.1. Also the Darwin Libc source | |
33 | contains the source code for malloc_freezedry and malloc_jumpstart. | |
34 | Read that to see what they do. This file was written completely | |
35 | from scratch, making use of information from the above sources. */ | |
36 | ||
37 | /* The Mac OS X implementation of unexec makes use of Darwin's `zone' | |
38 | memory allocator. All calls to malloc, realloc, and free in Emacs | |
39 | are redirected to unexec_malloc, unexec_realloc, and unexec_free in | |
40 | this file. When temacs is run, all memory requests are handled in | |
41 | the zone EmacsZone. The Darwin memory allocator library calls | |
42 | maintain the data structures to manage this zone. Dumping writes | |
43 | its contents to data segments of the executable file. When emacs | |
44 | is run, the loader recreates the contents of the zone in memory. | |
45 | However since the initialization routine of the zone memory | |
46 | allocator is run again, this `zone' can no longer be used as a | |
47 | heap. That is why emacs uses the ordinary malloc system call to | |
48 | allocate memory. Also, when a block of memory needs to be | |
49 | reallocated and the new size is larger than the old one, a new | |
50 | block must be obtained by malloc and the old contents copied to | |
51 | it. */ | |
52 | ||
53 | /* Peculiarity of the Mach-O files generated by ld in Mac OS X | |
54 | (possible causes of future bugs if changed). | |
55 | ||
56 | The file offset of the start of the __TEXT segment is zero. Since | |
57 | the Mach header and load commands are located at the beginning of a | |
58 | Mach-O file, copying the contents of the __TEXT segment from the | |
59 | input file overwrites them in the output file. Despite this, | |
60 | unexec works fine as written below because the segment load command | |
61 | for __TEXT appears, and is therefore processed, before all other | |
62 | load commands except the segment load command for __PAGEZERO, which | |
63 | remains unchanged. | |
64 | ||
65 | Although the file offset of the start of the __TEXT segment is | |
66 | zero, none of the sections it contains actually start there. In | |
67 | fact, the earliest one starts a few hundred bytes beyond the end of | |
68 | the last load command. The linker option -headerpad controls the | |
69 | minimum size of this padding. Its setting can be changed in | |
c57038f8 YM |
70 | s/darwin.h. A value of 0x690, e.g., leaves room for 30 additional |
71 | load commands for the newly created __DATA segments (at 56 bytes | |
72 | each). Unexec fails if there is not enough room for these new | |
73 | segments. | |
e0f712ba AC |
74 | |
75 | The __TEXT segment contains the sections __text, __cstring, | |
76 | __picsymbol_stub, and __const and the __DATA segment contains the | |
77 | sections __data, __la_symbol_ptr, __nl_symbol_ptr, __dyld, __bss, | |
78 | and __common. The other segments do not contain any sections. | |
79 | These sections are copied from the input file to the output file, | |
80 | except for __data, __bss, and __common, which are dumped from | |
81 | memory. The types of the sections __bss and __common are changed | |
82 | from S_ZEROFILL to S_REGULAR. Note that the number of sections and | |
83 | their relative order in the input and output files remain | |
84 | unchanged. Otherwise all n_sect fields in the nlist records in the | |
85 | symbol table (specified by the LC_SYMTAB load command) will have to | |
86 | be changed accordingly. | |
87 | */ | |
88 | ||
89 | #include <stdio.h> | |
90 | #include <stdlib.h> | |
91 | #include <fcntl.h> | |
92 | #include <stdarg.h> | |
93 | #include <sys/types.h> | |
94 | #include <unistd.h> | |
95 | #include <mach/mach.h> | |
96 | #include <mach-o/loader.h> | |
043131c4 AC |
97 | #include <mach-o/reloc.h> |
98 | #if defined (__ppc__) | |
99 | #include <mach-o/ppc/reloc.h> | |
100 | #endif | |
7f900522 YM |
101 | #include <config.h> |
102 | #undef malloc | |
103 | #undef realloc | |
104 | #undef free | |
105 | #ifdef HAVE_MALLOC_MALLOC_H | |
f7f3a65f ST |
106 | #include <malloc/malloc.h> |
107 | #else | |
e0f712ba | 108 | #include <objc/malloc.h> |
f7f3a65f ST |
109 | #endif |
110 | ||
40ef0695 YM |
111 | #include <assert.h> |
112 | ||
73da71f9 YM |
113 | #ifdef _LP64 |
114 | #define mach_header mach_header_64 | |
115 | #define segment_command segment_command_64 | |
116 | #undef VM_REGION_BASIC_INFO_COUNT | |
117 | #define VM_REGION_BASIC_INFO_COUNT VM_REGION_BASIC_INFO_COUNT_64 | |
118 | #undef VM_REGION_BASIC_INFO | |
119 | #define VM_REGION_BASIC_INFO VM_REGION_BASIC_INFO_64 | |
120 | #undef LC_SEGMENT | |
121 | #define LC_SEGMENT LC_SEGMENT_64 | |
122 | #define vm_region vm_region_64 | |
123 | #define section section_64 | |
124 | #undef MH_MAGIC | |
125 | #define MH_MAGIC MH_MAGIC_64 | |
126 | #endif | |
e0f712ba AC |
127 | |
128 | #define VERBOSE 1 | |
129 | ||
130 | /* Size of buffer used to copy data from the input file to the output | |
131 | file in function unexec_copy. */ | |
132 | #define UNEXEC_COPY_BUFSZ 1024 | |
133 | ||
134 | /* Regions with memory addresses above this value are assumed to be | |
135 | mapped to dynamically loaded libraries and will not be dumped. */ | |
136 | #define VM_DATA_TOP (20 * 1024 * 1024) | |
137 | ||
e0f712ba AC |
138 | /* Type of an element on the list of regions to be dumped. */ |
139 | struct region_t { | |
140 | vm_address_t address; | |
141 | vm_size_t size; | |
142 | vm_prot_t protection; | |
143 | vm_prot_t max_protection; | |
144 | ||
145 | struct region_t *next; | |
146 | }; | |
147 | ||
148 | /* Head and tail of the list of regions to be dumped. */ | |
c57038f8 YM |
149 | static struct region_t *region_list_head = 0; |
150 | static struct region_t *region_list_tail = 0; | |
e0f712ba AC |
151 | |
152 | /* Pointer to array of load commands. */ | |
c57038f8 | 153 | static struct load_command **lca; |
e0f712ba AC |
154 | |
155 | /* Number of load commands. */ | |
c57038f8 | 156 | static int nlc; |
e0f712ba AC |
157 | |
158 | /* The highest VM address of segments loaded by the input file. | |
159 | Regions with addresses beyond this are assumed to be allocated | |
160 | dynamically and thus require dumping. */ | |
c57038f8 | 161 | static vm_address_t infile_lc_highest_addr = 0; |
e0f712ba AC |
162 | |
163 | /* The lowest file offset used by the all sections in the __TEXT | |
164 | segments. This leaves room at the beginning of the file to store | |
165 | the Mach-O header. Check this value against header size to ensure | |
166 | the added load commands for the new __DATA segments did not | |
167 | overwrite any of the sections in the __TEXT segment. */ | |
c57038f8 | 168 | static unsigned long text_seg_lowest_offset = 0x10000000; |
e0f712ba AC |
169 | |
170 | /* Mach header. */ | |
c57038f8 | 171 | static struct mach_header mh; |
e0f712ba AC |
172 | |
173 | /* Offset at which the next load command should be written. */ | |
c57038f8 | 174 | static unsigned long curr_header_offset = sizeof (struct mach_header); |
e0f712ba | 175 | |
73da71f9 YM |
176 | /* Offset at which the next segment should be written. */ |
177 | static unsigned long curr_file_offset = 0; | |
178 | ||
179 | static unsigned long pagesize; | |
180 | #define ROUNDUP_TO_PAGE_BOUNDARY(x) (((x) + pagesize - 1) & ~(pagesize - 1)) | |
e0f712ba | 181 | |
c57038f8 | 182 | static int infd, outfd; |
e0f712ba | 183 | |
c57038f8 | 184 | static int in_dumped_exec = 0; |
e0f712ba | 185 | |
c57038f8 | 186 | static malloc_zone_t *emacs_zone; |
e0f712ba | 187 | |
043131c4 | 188 | /* file offset of input file's data segment */ |
c57038f8 | 189 | static off_t data_segment_old_fileoff = 0; |
043131c4 | 190 | |
c57038f8 | 191 | static struct segment_command *data_segment_scp; |
043131c4 | 192 | |
dd5ecd6b DN |
193 | static void unexec_error (const char *format, ...) NO_RETURN; |
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 | ||
72af86bd | 223 | memset (buf, 0, UNEXEC_COPY_BUFSZ); |
433456d7 YM |
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 | |
7aee76f4 | 272 | unexec_error (const char *format, ...) |
e0f712ba AC |
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 | |
3d608a86 | 310 | print_region_list (void) |
e0f712ba AC |
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 |
3d608a86 | 321 | print_regions (void) |
e0f712ba AC |
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 | |
3d608a86 | 351 | build_region_list (void) |
e0f712ba AC |
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 | { | |
ae7c60a9 | 446 | /* Subtract the size of trailing null bytes from filesize. It |
c57038f8 | 447 | can be smaller than vmsize in segment commands. In such a |
ae7c60a9 YM |
448 | case, trailing bytes are initialized with zeros. */ |
449 | for (p = ranges->address + ranges->size; p > ranges->address; p--) | |
450 | if (*(((char *) p)-1)) | |
451 | break; | |
452 | filesize = p - ranges->address; | |
c57038f8 YM |
453 | |
454 | unexec_regions[num_unexec_regions].filesize = filesize; | |
455 | unexec_regions[num_unexec_regions++].range = *ranges; | |
456 | printf ("%#10lx (sz: %#8lx/%#8lx)\n", (long) (ranges->address), | |
457 | (long) filesize, (long) (ranges->size)); | |
e0f712ba AC |
458 | ranges++; num--; |
459 | } | |
e0f712ba AC |
460 | } |
461 | ||
462 | static kern_return_t | |
463 | unexec_reader (task_t task, vm_address_t address, vm_size_t size, void **ptr) | |
464 | { | |
465 | *ptr = (void *) address; | |
466 | return KERN_SUCCESS; | |
467 | } | |
468 | ||
c57038f8 | 469 | static void |
3d608a86 | 470 | find_emacs_zone_regions (void) |
e0f712ba AC |
471 | { |
472 | num_unexec_regions = 0; | |
473 | ||
474 | emacs_zone->introspect->enumerator (mach_task_self(), 0, | |
475 | MALLOC_PTR_REGION_RANGE_TYPE | |
476 | | MALLOC_ADMIN_REGION_RANGE_TYPE, | |
477 | (vm_address_t) emacs_zone, | |
478 | unexec_reader, | |
479 | unexec_regions_recorder); | |
73da71f9 YM |
480 | |
481 | if (num_unexec_regions == MAX_UNEXEC_REGIONS) | |
482 | unexec_error ("find_emacs_zone_regions: too many regions"); | |
e0f712ba AC |
483 | } |
484 | ||
1dd7ccf2 AC |
485 | static int |
486 | unexec_regions_sort_compare (const void *a, const void *b) | |
487 | { | |
c57038f8 YM |
488 | vm_address_t aa = ((unexec_region_info *) a)->range.address; |
489 | vm_address_t bb = ((unexec_region_info *) b)->range.address; | |
1dd7ccf2 AC |
490 | |
491 | if (aa < bb) | |
492 | return -1; | |
493 | else if (aa > bb) | |
494 | return 1; | |
495 | else | |
496 | return 0; | |
497 | } | |
498 | ||
499 | static void | |
3d608a86 | 500 | unexec_regions_merge (void) |
1dd7ccf2 AC |
501 | { |
502 | int i, n; | |
c57038f8 | 503 | unexec_region_info r; |
ae7c60a9 | 504 | vm_size_t padsize; |
1dd7ccf2 AC |
505 | |
506 | qsort (unexec_regions, num_unexec_regions, sizeof (unexec_regions[0]), | |
507 | &unexec_regions_sort_compare); | |
508 | n = 0; | |
509 | r = unexec_regions[0]; | |
ae7c60a9 YM |
510 | padsize = r.range.address & (pagesize - 1); |
511 | if (padsize) | |
512 | { | |
513 | r.range.address -= padsize; | |
514 | r.range.size += padsize; | |
515 | r.filesize += padsize; | |
516 | } | |
1dd7ccf2 AC |
517 | for (i = 1; i < num_unexec_regions; i++) |
518 | { | |
c57038f8 YM |
519 | if (r.range.address + r.range.size == unexec_regions[i].range.address |
520 | && r.range.size - r.filesize < 2 * pagesize) | |
1dd7ccf2 | 521 | { |
c57038f8 YM |
522 | r.filesize = r.range.size + unexec_regions[i].filesize; |
523 | r.range.size += unexec_regions[i].range.size; | |
1dd7ccf2 AC |
524 | } |
525 | else | |
526 | { | |
527 | unexec_regions[n++] = r; | |
528 | r = unexec_regions[i]; | |
ae7c60a9 YM |
529 | padsize = r.range.address & (pagesize - 1); |
530 | if (padsize) | |
531 | { | |
532 | if ((unexec_regions[n-1].range.address | |
533 | + unexec_regions[n-1].range.size) == r.range.address) | |
534 | unexec_regions[n-1].range.size -= padsize; | |
535 | ||
536 | r.range.address -= padsize; | |
537 | r.range.size += padsize; | |
538 | r.filesize += padsize; | |
539 | } | |
1dd7ccf2 AC |
540 | } |
541 | } | |
542 | unexec_regions[n++] = r; | |
543 | num_unexec_regions = n; | |
544 | } | |
545 | ||
e0f712ba AC |
546 | |
547 | /* More informational messages routines. */ | |
548 | ||
549 | static void | |
550 | print_load_command_name (int lc) | |
551 | { | |
552 | switch (lc) | |
553 | { | |
554 | case LC_SEGMENT: | |
73da71f9 | 555 | #ifndef _LP64 |
e0f712ba | 556 | printf ("LC_SEGMENT "); |
73da71f9 YM |
557 | #else |
558 | printf ("LC_SEGMENT_64 "); | |
559 | #endif | |
e0f712ba AC |
560 | break; |
561 | case LC_LOAD_DYLINKER: | |
562 | printf ("LC_LOAD_DYLINKER "); | |
563 | break; | |
564 | case LC_LOAD_DYLIB: | |
565 | printf ("LC_LOAD_DYLIB "); | |
566 | break; | |
567 | case LC_SYMTAB: | |
568 | printf ("LC_SYMTAB "); | |
569 | break; | |
570 | case LC_DYSYMTAB: | |
571 | printf ("LC_DYSYMTAB "); | |
572 | break; | |
573 | case LC_UNIXTHREAD: | |
574 | printf ("LC_UNIXTHREAD "); | |
575 | break; | |
576 | case LC_PREBOUND_DYLIB: | |
577 | printf ("LC_PREBOUND_DYLIB"); | |
578 | break; | |
579 | case LC_TWOLEVEL_HINTS: | |
580 | printf ("LC_TWOLEVEL_HINTS"); | |
581 | break; | |
ae7c60a9 YM |
582 | #ifdef LC_UUID |
583 | case LC_UUID: | |
584 | printf ("LC_UUID "); | |
585 | break; | |
6bcd6333 YM |
586 | #endif |
587 | #ifdef LC_DYLD_INFO | |
588 | case LC_DYLD_INFO: | |
589 | printf ("LC_DYLD_INFO "); | |
590 | break; | |
591 | case LC_DYLD_INFO_ONLY: | |
592 | printf ("LC_DYLD_INFO_ONLY"); | |
593 | break; | |
ae7c60a9 | 594 | #endif |
e0f712ba AC |
595 | default: |
596 | printf ("unknown "); | |
597 | } | |
598 | } | |
599 | ||
600 | static void | |
601 | print_load_command (struct load_command *lc) | |
602 | { | |
603 | print_load_command_name (lc->cmd); | |
604 | printf ("%8d", lc->cmdsize); | |
605 | ||
606 | if (lc->cmd == LC_SEGMENT) | |
607 | { | |
608 | struct segment_command *scp; | |
609 | struct section *sectp; | |
610 | int j; | |
611 | ||
612 | scp = (struct segment_command *) lc; | |
73da71f9 YM |
613 | printf (" %-16.16s %#10lx %#8lx\n", |
614 | scp->segname, (long) (scp->vmaddr), (long) (scp->vmsize)); | |
e0f712ba AC |
615 | |
616 | sectp = (struct section *) (scp + 1); | |
617 | for (j = 0; j < scp->nsects; j++) | |
618 | { | |
73da71f9 YM |
619 | printf (" %-16.16s %#10lx %#8lx\n", |
620 | sectp->sectname, (long) (sectp->addr), (long) (sectp->size)); | |
e0f712ba AC |
621 | sectp++; |
622 | } | |
623 | } | |
624 | else | |
625 | printf ("\n"); | |
626 | } | |
627 | ||
628 | /* Read header and load commands from input file. Store the latter in | |
629 | the global array lca. Store the total number of load commands in | |
630 | global variable nlc. */ | |
631 | static void | |
3d608a86 | 632 | read_load_commands (void) |
e0f712ba | 633 | { |
7f900522 | 634 | int i; |
e0f712ba AC |
635 | |
636 | if (!unexec_read (&mh, sizeof (struct mach_header))) | |
637 | unexec_error ("cannot read mach-o header"); | |
638 | ||
639 | if (mh.magic != MH_MAGIC) | |
640 | unexec_error ("input file not in Mach-O format"); | |
641 | ||
642 | if (mh.filetype != MH_EXECUTE) | |
643 | unexec_error ("input Mach-O file is not an executable object file"); | |
644 | ||
645 | #if VERBOSE | |
646 | printf ("--- Header Information ---\n"); | |
647 | printf ("Magic = 0x%08x\n", mh.magic); | |
648 | printf ("CPUType = %d\n", mh.cputype); | |
649 | printf ("CPUSubType = %d\n", mh.cpusubtype); | |
650 | printf ("FileType = 0x%x\n", mh.filetype); | |
651 | printf ("NCmds = %d\n", mh.ncmds); | |
652 | printf ("SizeOfCmds = %d\n", mh.sizeofcmds); | |
653 | printf ("Flags = 0x%08x\n", mh.flags); | |
654 | #endif | |
655 | ||
656 | nlc = mh.ncmds; | |
657 | lca = (struct load_command **) malloc (nlc * sizeof (struct load_command *)); | |
177c0ea7 | 658 | |
e0f712ba AC |
659 | for (i = 0; i < nlc; i++) |
660 | { | |
661 | struct load_command lc; | |
662 | /* Load commands are variable-size: so read the command type and | |
663 | size first and then read the rest. */ | |
664 | if (!unexec_read (&lc, sizeof (struct load_command))) | |
665 | unexec_error ("cannot read load command"); | |
666 | lca[i] = (struct load_command *) malloc (lc.cmdsize); | |
667 | memcpy (lca[i], &lc, sizeof (struct load_command)); | |
668 | if (!unexec_read (lca[i] + 1, lc.cmdsize - sizeof (struct load_command))) | |
669 | unexec_error ("cannot read content of load command"); | |
670 | if (lc.cmd == LC_SEGMENT) | |
671 | { | |
672 | struct segment_command *scp = (struct segment_command *) lca[i]; | |
177c0ea7 | 673 | |
e0f712ba AC |
674 | if (scp->vmaddr + scp->vmsize > infile_lc_highest_addr) |
675 | infile_lc_highest_addr = scp->vmaddr + scp->vmsize; | |
676 | ||
677 | if (strncmp (scp->segname, SEG_TEXT, 16) == 0) | |
678 | { | |
679 | struct section *sectp = (struct section *) (scp + 1); | |
680 | int j; | |
681 | ||
682 | for (j = 0; j < scp->nsects; j++) | |
683 | if (sectp->offset < text_seg_lowest_offset) | |
684 | text_seg_lowest_offset = sectp->offset; | |
685 | } | |
686 | } | |
687 | } | |
688 | ||
3d608a86 J |
689 | printf ("Highest address of load commands in input file: %#8lx\n", |
690 | (unsigned long)infile_lc_highest_addr); | |
e0f712ba | 691 | |
c57038f8 | 692 | printf ("Lowest offset of all sections in __TEXT segment: %#8lx\n", |
e0f712ba AC |
693 | text_seg_lowest_offset); |
694 | ||
695 | printf ("--- List of Load Commands in Input File ---\n"); | |
696 | printf ("# cmd cmdsize name address size\n"); | |
697 | ||
698 | for (i = 0; i < nlc; i++) | |
699 | { | |
700 | printf ("%1d ", i); | |
701 | print_load_command (lca[i]); | |
702 | } | |
703 | } | |
704 | ||
705 | /* Copy a LC_SEGMENT load command other than the __DATA segment from | |
706 | the input file to the output file, adjusting the file offset of the | |
707 | segment and the file offsets of sections contained in it. */ | |
708 | static void | |
709 | copy_segment (struct load_command *lc) | |
710 | { | |
711 | struct segment_command *scp = (struct segment_command *) lc; | |
712 | unsigned long old_fileoff = scp->fileoff; | |
713 | struct section *sectp; | |
714 | int j; | |
715 | ||
73da71f9 | 716 | scp->fileoff = curr_file_offset; |
e0f712ba AC |
717 | |
718 | sectp = (struct section *) (scp + 1); | |
719 | for (j = 0; j < scp->nsects; j++) | |
720 | { | |
73da71f9 | 721 | sectp->offset += curr_file_offset - old_fileoff; |
e0f712ba AC |
722 | sectp++; |
723 | } | |
724 | ||
c57038f8 YM |
725 | printf ("Writing segment %-16.16s @ %#8lx (%#8lx/%#8lx @ %#10lx)\n", |
726 | scp->segname, (long) (scp->fileoff), (long) (scp->filesize), | |
727 | (long) (scp->vmsize), (long) (scp->vmaddr)); | |
e0f712ba AC |
728 | |
729 | if (!unexec_copy (scp->fileoff, old_fileoff, scp->filesize)) | |
730 | unexec_error ("cannot copy segment from input to output file"); | |
73da71f9 YM |
731 | curr_file_offset += ROUNDUP_TO_PAGE_BOUNDARY (scp->filesize); |
732 | ||
e0f712ba AC |
733 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) |
734 | unexec_error ("cannot write load command to header"); | |
735 | ||
736 | curr_header_offset += lc->cmdsize; | |
737 | } | |
738 | ||
739 | /* Copy a LC_SEGMENT load command for the __DATA segment in the input | |
740 | file to the output file. We assume that only one such segment load | |
741 | command exists in the input file and it contains the sections | |
742 | __data, __bss, __common, __la_symbol_ptr, __nl_symbol_ptr, and | |
743 | __dyld. The first three of these should be dumped from memory and | |
744 | the rest should be copied from the input file. Note that the | |
745 | sections __bss and __common contain no data in the input file | |
746 | because their flag fields have the value S_ZEROFILL. Dumping these | |
747 | from memory makes it necessary to adjust file offset fields in | |
748 | subsequently dumped load commands. Then, create new __DATA segment | |
749 | load commands for regions on the region list other than the one | |
750 | corresponding to the __DATA segment in the input file. */ | |
751 | static void | |
752 | copy_data_segment (struct load_command *lc) | |
753 | { | |
754 | struct segment_command *scp = (struct segment_command *) lc; | |
755 | struct section *sectp; | |
756 | int j; | |
c57038f8 YM |
757 | unsigned long header_offset, old_file_offset; |
758 | ||
759 | /* The new filesize of the segment is set to its vmsize because data | |
760 | blocks for segments must start at region boundaries. Note that | |
761 | this may leave unused locations at the end of the segment data | |
762 | block because the total of the sizes of all sections in the | |
763 | segment is generally smaller than vmsize. */ | |
764 | scp->filesize = scp->vmsize; | |
e0f712ba | 765 | |
c57038f8 YM |
766 | printf ("Writing segment %-16.16s @ %#8lx (%#8lx/%#8lx @ %#10lx)\n", |
767 | scp->segname, curr_file_offset, (long)(scp->filesize), | |
768 | (long)(scp->vmsize), (long) (scp->vmaddr)); | |
e0f712ba AC |
769 | |
770 | /* Offsets in the output file for writing the next section structure | |
771 | and segment data block, respectively. */ | |
772 | header_offset = curr_header_offset + sizeof (struct segment_command); | |
773 | ||
774 | sectp = (struct section *) (scp + 1); | |
775 | for (j = 0; j < scp->nsects; j++) | |
776 | { | |
777 | old_file_offset = sectp->offset; | |
73da71f9 | 778 | sectp->offset = sectp->addr - scp->vmaddr + curr_file_offset; |
e0f712ba AC |
779 | /* The __data section is dumped from memory. The __bss and |
780 | __common sections are also dumped from memory but their flag | |
781 | fields require changing (from S_ZEROFILL to S_REGULAR). The | |
782 | other three kinds of sections are just copied from the input | |
783 | file. */ | |
784 | if (strncmp (sectp->sectname, SECT_DATA, 16) == 0) | |
785 | { | |
786 | if (!unexec_write (sectp->offset, (void *) sectp->addr, sectp->size)) | |
787 | unexec_error ("cannot write section %s", SECT_DATA); | |
788 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) | |
789 | unexec_error ("cannot write section %s's header", SECT_DATA); | |
790 | } | |
433456d7 | 791 | else if (strncmp (sectp->sectname, SECT_COMMON, 16) == 0) |
e0f712ba AC |
792 | { |
793 | sectp->flags = S_REGULAR; | |
794 | if (!unexec_write (sectp->offset, (void *) sectp->addr, sectp->size)) | |
433456d7 | 795 | unexec_error ("cannot write section %s", sectp->sectname); |
e0f712ba | 796 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) |
433456d7 YM |
797 | unexec_error ("cannot write section %s's header", sectp->sectname); |
798 | } | |
799 | else if (strncmp (sectp->sectname, SECT_BSS, 16) == 0) | |
800 | { | |
801 | extern char *my_endbss_static; | |
802 | unsigned long my_size; | |
803 | ||
804 | sectp->flags = S_REGULAR; | |
805 | ||
806 | /* Clear uninitialized local variables in statically linked | |
807 | libraries. In particular, function pointers stored by | |
808 | libSystemStub.a, which is introduced in Mac OS X 10.4 for | |
809 | binary compatibility with respect to long double, are | |
810 | cleared so that they will be reinitialized when the | |
811 | dumped binary is executed on other versions of OS. */ | |
812 | my_size = (unsigned long)my_endbss_static - sectp->addr; | |
813 | if (!(sectp->addr <= (unsigned long)my_endbss_static | |
814 | && my_size <= sectp->size)) | |
815 | unexec_error ("my_endbss_static is not in section %s", | |
816 | sectp->sectname); | |
817 | if (!unexec_write (sectp->offset, (void *) sectp->addr, my_size)) | |
818 | unexec_error ("cannot write section %s", sectp->sectname); | |
819 | if (!unexec_write_zero (sectp->offset + my_size, | |
820 | sectp->size - my_size)) | |
821 | unexec_error ("cannot write section %s", sectp->sectname); | |
822 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) | |
823 | unexec_error ("cannot write section %s's header", sectp->sectname); | |
e0f712ba AC |
824 | } |
825 | else if (strncmp (sectp->sectname, "__la_symbol_ptr", 16) == 0 | |
826 | || strncmp (sectp->sectname, "__nl_symbol_ptr", 16) == 0 | |
427c5b1b | 827 | || strncmp (sectp->sectname, "__la_sym_ptr2", 16) == 0 |
e0f712ba | 828 | || strncmp (sectp->sectname, "__dyld", 16) == 0 |
7290a344 | 829 | || strncmp (sectp->sectname, "__const", 16) == 0 |
b2411edf YM |
830 | || strncmp (sectp->sectname, "__cfstring", 16) == 0 |
831 | || strncmp (sectp->sectname, "__gcc_except_tab", 16) == 0 | |
6bcd6333 | 832 | || strncmp (sectp->sectname, "__program_vars", 16) == 0 |
b2411edf | 833 | || strncmp (sectp->sectname, "__objc_", 7) == 0) |
e0f712ba AC |
834 | { |
835 | if (!unexec_copy (sectp->offset, old_file_offset, sectp->size)) | |
836 | unexec_error ("cannot copy section %s", sectp->sectname); | |
837 | if (!unexec_write (header_offset, sectp, sizeof (struct section))) | |
838 | unexec_error ("cannot write section %s's header", sectp->sectname); | |
839 | } | |
840 | else | |
841 | unexec_error ("unrecognized section name in __DATA segment"); | |
177c0ea7 | 842 | |
73da71f9 YM |
843 | printf (" section %-16.16s at %#8lx - %#8lx (sz: %#8lx)\n", |
844 | sectp->sectname, (long) (sectp->offset), | |
845 | (long) (sectp->offset + sectp->size), (long) (sectp->size)); | |
e0f712ba AC |
846 | |
847 | header_offset += sizeof (struct section); | |
848 | sectp++; | |
849 | } | |
850 | ||
c57038f8 YM |
851 | curr_file_offset += ROUNDUP_TO_PAGE_BOUNDARY (scp->filesize); |
852 | ||
e0f712ba AC |
853 | if (!unexec_write (curr_header_offset, scp, sizeof (struct segment_command))) |
854 | unexec_error ("cannot write header of __DATA segment"); | |
855 | curr_header_offset += lc->cmdsize; | |
856 | ||
857 | /* Create new __DATA segment load commands for regions on the region | |
858 | list that do not corresponding to any segment load commands in | |
859 | the input file. | |
73da71f9 | 860 | */ |
e0f712ba AC |
861 | for (j = 0; j < num_unexec_regions; j++) |
862 | { | |
863 | struct segment_command sc; | |
177c0ea7 | 864 | |
e0f712ba AC |
865 | sc.cmd = LC_SEGMENT; |
866 | sc.cmdsize = sizeof (struct segment_command); | |
867 | strncpy (sc.segname, SEG_DATA, 16); | |
c57038f8 YM |
868 | sc.vmaddr = unexec_regions[j].range.address; |
869 | sc.vmsize = unexec_regions[j].range.size; | |
73da71f9 | 870 | sc.fileoff = curr_file_offset; |
c57038f8 | 871 | sc.filesize = unexec_regions[j].filesize; |
e0f712ba AC |
872 | sc.maxprot = VM_PROT_READ | VM_PROT_WRITE; |
873 | sc.initprot = VM_PROT_READ | VM_PROT_WRITE; | |
874 | sc.nsects = 0; | |
875 | sc.flags = 0; | |
177c0ea7 | 876 | |
c57038f8 YM |
877 | printf ("Writing segment %-16.16s @ %#8lx (%#8lx/%#8lx @ %#10lx)\n", |
878 | sc.segname, (long) (sc.fileoff), (long) (sc.filesize), | |
879 | (long) (sc.vmsize), (long) (sc.vmaddr)); | |
e0f712ba | 880 | |
c57038f8 | 881 | if (!unexec_write (sc.fileoff, (void *) sc.vmaddr, sc.filesize)) |
e0f712ba | 882 | unexec_error ("cannot write new __DATA segment"); |
73da71f9 | 883 | curr_file_offset += ROUNDUP_TO_PAGE_BOUNDARY (sc.filesize); |
177c0ea7 | 884 | |
e0f712ba AC |
885 | if (!unexec_write (curr_header_offset, &sc, sc.cmdsize)) |
886 | unexec_error ("cannot write new __DATA segment's header"); | |
887 | curr_header_offset += sc.cmdsize; | |
888 | mh.ncmds++; | |
889 | } | |
890 | } | |
891 | ||
892 | /* Copy a LC_SYMTAB load command from the input file to the output | |
893 | file, adjusting the file offset fields. */ | |
894 | static void | |
73da71f9 | 895 | copy_symtab (struct load_command *lc, long delta) |
e0f712ba AC |
896 | { |
897 | struct symtab_command *stp = (struct symtab_command *) lc; | |
898 | ||
899 | stp->symoff += delta; | |
900 | stp->stroff += delta; | |
901 | ||
902 | printf ("Writing LC_SYMTAB command\n"); | |
903 | ||
904 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
905 | unexec_error ("cannot write symtab command to header"); | |
906 | ||
907 | curr_header_offset += lc->cmdsize; | |
908 | } | |
909 | ||
043131c4 AC |
910 | /* Fix up relocation entries. */ |
911 | static void | |
7aee2da7 | 912 | unrelocate (const char *name, off_t reloff, int nrel, vm_address_t base) |
043131c4 AC |
913 | { |
914 | int i, unreloc_count; | |
915 | struct relocation_info reloc_info; | |
916 | struct scattered_relocation_info *sc_reloc_info | |
917 | = (struct scattered_relocation_info *) &reloc_info; | |
7aee2da7 | 918 | vm_address_t location; |
043131c4 AC |
919 | |
920 | for (unreloc_count = 0, i = 0; i < nrel; i++) | |
921 | { | |
922 | if (lseek (infd, reloff, L_SET) != reloff) | |
923 | unexec_error ("unrelocate: %s:%d cannot seek to reloc_info", name, i); | |
924 | if (!unexec_read (&reloc_info, sizeof (reloc_info))) | |
925 | unexec_error ("unrelocate: %s:%d cannot read reloc_info", name, i); | |
926 | reloff += sizeof (reloc_info); | |
927 | ||
928 | if (sc_reloc_info->r_scattered == 0) | |
929 | switch (reloc_info.r_type) | |
930 | { | |
931 | case GENERIC_RELOC_VANILLA: | |
7aee2da7 | 932 | location = base + reloc_info.r_address; |
b2411edf YM |
933 | if (location >= data_segment_scp->vmaddr |
934 | && location < (data_segment_scp->vmaddr | |
935 | + data_segment_scp->vmsize)) | |
043131c4 AC |
936 | { |
937 | off_t src_off = data_segment_old_fileoff | |
b2411edf | 938 | + (location - data_segment_scp->vmaddr); |
043131c4 | 939 | off_t dst_off = data_segment_scp->fileoff |
b2411edf | 940 | + (location - data_segment_scp->vmaddr); |
043131c4 AC |
941 | |
942 | if (!unexec_copy (dst_off, src_off, 1 << reloc_info.r_length)) | |
943 | unexec_error ("unrelocate: %s:%d cannot copy original value", | |
944 | name, i); | |
945 | unreloc_count++; | |
946 | } | |
947 | break; | |
948 | default: | |
949 | unexec_error ("unrelocate: %s:%d cannot handle type = %d", | |
950 | name, i, reloc_info.r_type); | |
951 | } | |
952 | else | |
953 | switch (sc_reloc_info->r_type) | |
954 | { | |
955 | #if defined (__ppc__) | |
956 | case PPC_RELOC_PB_LA_PTR: | |
957 | /* nothing to do for prebound lazy pointer */ | |
958 | break; | |
959 | #endif | |
960 | default: | |
961 | unexec_error ("unrelocate: %s:%d cannot handle scattered type = %d", | |
962 | name, i, sc_reloc_info->r_type); | |
963 | } | |
964 | } | |
965 | ||
966 | if (nrel > 0) | |
967 | printf ("Fixed up %d/%d %s relocation entries in data segment.\n", | |
968 | unreloc_count, nrel, name); | |
969 | } | |
970 | ||
7aee2da7 YM |
971 | #if __ppc64__ |
972 | /* Rebase r_address in the relocation table. */ | |
973 | static void | |
974 | rebase_reloc_address (off_t reloff, int nrel, long linkedit_delta, long diff) | |
975 | { | |
976 | int i; | |
977 | struct relocation_info reloc_info; | |
978 | struct scattered_relocation_info *sc_reloc_info | |
979 | = (struct scattered_relocation_info *) &reloc_info; | |
980 | ||
981 | for (i = 0; i < nrel; i++, reloff += sizeof (reloc_info)) | |
982 | { | |
983 | if (lseek (infd, reloff - linkedit_delta, L_SET) | |
984 | != reloff - linkedit_delta) | |
985 | unexec_error ("rebase_reloc_table: cannot seek to reloc_info"); | |
986 | if (!unexec_read (&reloc_info, sizeof (reloc_info))) | |
987 | unexec_error ("rebase_reloc_table: cannot read reloc_info"); | |
988 | ||
989 | if (sc_reloc_info->r_scattered == 0 | |
990 | && reloc_info.r_type == GENERIC_RELOC_VANILLA) | |
991 | { | |
992 | reloc_info.r_address -= diff; | |
993 | if (!unexec_write (reloff, &reloc_info, sizeof (reloc_info))) | |
994 | unexec_error ("rebase_reloc_table: cannot write reloc_info"); | |
995 | } | |
996 | } | |
997 | } | |
998 | #endif | |
999 | ||
e0f712ba AC |
1000 | /* Copy a LC_DYSYMTAB load command from the input file to the output |
1001 | file, adjusting the file offset fields. */ | |
1002 | static void | |
73da71f9 | 1003 | copy_dysymtab (struct load_command *lc, long delta) |
e0f712ba AC |
1004 | { |
1005 | struct dysymtab_command *dstp = (struct dysymtab_command *) lc; | |
7aee2da7 | 1006 | vm_address_t base; |
e0f712ba | 1007 | |
7aee2da7 YM |
1008 | #ifdef _LP64 |
1009 | #if __ppc64__ | |
1010 | { | |
1011 | int i; | |
1012 | ||
1013 | base = 0; | |
1014 | for (i = 0; i < nlc; i++) | |
1015 | if (lca[i]->cmd == LC_SEGMENT) | |
1016 | { | |
1017 | struct segment_command *scp = (struct segment_command *) lca[i]; | |
1018 | ||
1019 | if (scp->vmaddr + scp->vmsize > 0x100000000 | |
1020 | && (scp->initprot & VM_PROT_WRITE) != 0) | |
1021 | { | |
1022 | base = data_segment_scp->vmaddr; | |
1023 | break; | |
1024 | } | |
1025 | } | |
1026 | } | |
1027 | #else | |
1028 | /* First writable segment address. */ | |
1029 | base = data_segment_scp->vmaddr; | |
1030 | #endif | |
1031 | #else | |
1032 | /* First segment address in the file (unless MH_SPLIT_SEGS set). */ | |
1033 | base = 0; | |
1034 | #endif | |
1035 | ||
1036 | unrelocate ("local", dstp->locreloff, dstp->nlocrel, base); | |
1037 | unrelocate ("external", dstp->extreloff, dstp->nextrel, base); | |
e0f712ba AC |
1038 | |
1039 | if (dstp->nextrel > 0) { | |
1040 | dstp->extreloff += delta; | |
1041 | } | |
1042 | ||
1043 | if (dstp->nlocrel > 0) { | |
1044 | dstp->locreloff += delta; | |
1045 | } | |
1046 | ||
1047 | if (dstp->nindirectsyms > 0) | |
1048 | dstp->indirectsymoff += delta; | |
1049 | ||
1050 | printf ("Writing LC_DYSYMTAB command\n"); | |
1051 | ||
1052 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
1053 | unexec_error ("cannot write symtab command to header"); | |
1054 | ||
1055 | curr_header_offset += lc->cmdsize; | |
7aee2da7 YM |
1056 | |
1057 | #if __ppc64__ | |
1058 | /* Check if the relocation base needs to be changed. */ | |
1059 | if (base == 0) | |
1060 | { | |
1061 | vm_address_t newbase = 0; | |
1062 | int i; | |
1063 | ||
1064 | for (i = 0; i < num_unexec_regions; i++) | |
1065 | if (unexec_regions[i].range.address + unexec_regions[i].range.size | |
1066 | > 0x100000000) | |
1067 | { | |
1068 | newbase = data_segment_scp->vmaddr; | |
1069 | break; | |
1070 | } | |
1071 | ||
1072 | if (newbase) | |
1073 | { | |
1074 | rebase_reloc_address (dstp->locreloff, dstp->nlocrel, delta, newbase); | |
1075 | rebase_reloc_address (dstp->extreloff, dstp->nextrel, delta, newbase); | |
1076 | } | |
1077 | } | |
1078 | #endif | |
e0f712ba AC |
1079 | } |
1080 | ||
40e6ff95 ST |
1081 | /* Copy a LC_TWOLEVEL_HINTS load command from the input file to the output |
1082 | file, adjusting the file offset fields. */ | |
1083 | static void | |
73da71f9 | 1084 | copy_twolevelhints (struct load_command *lc, long delta) |
40e6ff95 ST |
1085 | { |
1086 | struct twolevel_hints_command *tlhp = (struct twolevel_hints_command *) lc; | |
1087 | ||
1088 | if (tlhp->nhints > 0) { | |
1089 | tlhp->offset += delta; | |
1090 | } | |
1091 | ||
1092 | printf ("Writing LC_TWOLEVEL_HINTS command\n"); | |
1093 | ||
1094 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
1095 | unexec_error ("cannot write two level hint command to header"); | |
1096 | ||
1097 | curr_header_offset += lc->cmdsize; | |
1098 | } | |
1099 | ||
6bcd6333 YM |
1100 | #ifdef LC_DYLD_INFO |
1101 | /* Copy a LC_DYLD_INFO(_ONLY) load command from the input file to the output | |
1102 | file, adjusting the file offset fields. */ | |
1103 | static void | |
1104 | copy_dyld_info (struct load_command *lc, long delta) | |
1105 | { | |
1106 | struct dyld_info_command *dip = (struct dyld_info_command *) lc; | |
1107 | ||
1108 | if (dip->rebase_off > 0) | |
1109 | dip->rebase_off += delta; | |
1110 | if (dip->bind_off > 0) | |
1111 | dip->bind_off += delta; | |
1112 | if (dip->weak_bind_off > 0) | |
1113 | dip->weak_bind_off += delta; | |
1114 | if (dip->lazy_bind_off > 0) | |
1115 | dip->lazy_bind_off += delta; | |
1116 | if (dip->export_off > 0) | |
1117 | dip->export_off += delta; | |
1118 | ||
1119 | printf ("Writing "); | |
1120 | print_load_command_name (lc->cmd); | |
1121 | printf (" command\n"); | |
1122 | ||
1123 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
1124 | unexec_error ("cannot write dyld info command to header"); | |
1125 | ||
1126 | curr_header_offset += lc->cmdsize; | |
1127 | } | |
1128 | #endif | |
1129 | ||
e0f712ba AC |
1130 | /* Copy other kinds of load commands from the input file to the output |
1131 | file, ones that do not require adjustments of file offsets. */ | |
1132 | static void | |
1133 | copy_other (struct load_command *lc) | |
1134 | { | |
1135 | printf ("Writing "); | |
1136 | print_load_command_name (lc->cmd); | |
1137 | printf (" command\n"); | |
1138 | ||
1139 | if (!unexec_write (curr_header_offset, lc, lc->cmdsize)) | |
1140 | unexec_error ("cannot write symtab command to header"); | |
1141 | ||
1142 | curr_header_offset += lc->cmdsize; | |
1143 | } | |
1144 | ||
1145 | /* Loop through all load commands and dump them. Then write the Mach | |
1146 | header. */ | |
1147 | static void | |
3d608a86 | 1148 | dump_it (void) |
e0f712ba AC |
1149 | { |
1150 | int i; | |
73da71f9 | 1151 | long linkedit_delta = 0; |
e0f712ba AC |
1152 | |
1153 | printf ("--- Load Commands written to Output File ---\n"); | |
1154 | ||
1155 | for (i = 0; i < nlc; i++) | |
1156 | switch (lca[i]->cmd) | |
1157 | { | |
1158 | case LC_SEGMENT: | |
1159 | { | |
1160 | struct segment_command *scp = (struct segment_command *) lca[i]; | |
1161 | if (strncmp (scp->segname, SEG_DATA, 16) == 0) | |
1162 | { | |
043131c4 AC |
1163 | /* save data segment file offset and segment_command for |
1164 | unrelocate */ | |
73da71f9 YM |
1165 | if (data_segment_old_fileoff) |
1166 | unexec_error ("cannot handle multiple DATA segments" | |
1167 | " in input file"); | |
043131c4 AC |
1168 | data_segment_old_fileoff = scp->fileoff; |
1169 | data_segment_scp = scp; | |
1170 | ||
e0f712ba AC |
1171 | copy_data_segment (lca[i]); |
1172 | } | |
1173 | else | |
1174 | { | |
73da71f9 YM |
1175 | if (strncmp (scp->segname, SEG_LINKEDIT, 16) == 0) |
1176 | { | |
1177 | if (linkedit_delta) | |
1178 | unexec_error ("cannot handle multiple LINKEDIT segments" | |
1179 | " in input file"); | |
1180 | linkedit_delta = curr_file_offset - scp->fileoff; | |
1181 | } | |
1182 | ||
e0f712ba AC |
1183 | copy_segment (lca[i]); |
1184 | } | |
1185 | } | |
1186 | break; | |
1187 | case LC_SYMTAB: | |
73da71f9 | 1188 | copy_symtab (lca[i], linkedit_delta); |
e0f712ba AC |
1189 | break; |
1190 | case LC_DYSYMTAB: | |
73da71f9 | 1191 | copy_dysymtab (lca[i], linkedit_delta); |
e0f712ba | 1192 | break; |
40e6ff95 | 1193 | case LC_TWOLEVEL_HINTS: |
73da71f9 | 1194 | copy_twolevelhints (lca[i], linkedit_delta); |
40e6ff95 | 1195 | break; |
6bcd6333 YM |
1196 | #ifdef LC_DYLD_INFO |
1197 | case LC_DYLD_INFO: | |
1198 | case LC_DYLD_INFO_ONLY: | |
1199 | copy_dyld_info (lca[i], linkedit_delta); | |
1200 | break; | |
1201 | #endif | |
e0f712ba AC |
1202 | default: |
1203 | copy_other (lca[i]); | |
1204 | break; | |
1205 | } | |
1206 | ||
1207 | if (curr_header_offset > text_seg_lowest_offset) | |
1208 | unexec_error ("not enough room for load commands for new __DATA segments"); | |
1209 | ||
c57038f8 | 1210 | printf ("%ld unused bytes follow Mach-O header\n", |
e0f712ba AC |
1211 | text_seg_lowest_offset - curr_header_offset); |
1212 | ||
1213 | mh.sizeofcmds = curr_header_offset - sizeof (struct mach_header); | |
1214 | if (!unexec_write (0, &mh, sizeof (struct mach_header))) | |
1215 | unexec_error ("cannot write final header contents"); | |
1216 | } | |
1217 | ||
1218 | /* Take a snapshot of Emacs and make a Mach-O format executable file | |
1219 | from it. The file names of the output and input files are outfile | |
1220 | and infile, respectively. The three other parameters are | |
1221 | ignored. */ | |
dd5ecd6b DN |
1222 | int |
1223 | unexec (const char *outfile, const char *infile) | |
e0f712ba | 1224 | { |
6dc5c8a7 YM |
1225 | if (in_dumped_exec) |
1226 | unexec_error ("Unexec from a dumped executable is not supported."); | |
1227 | ||
73da71f9 | 1228 | pagesize = getpagesize (); |
e0f712ba AC |
1229 | infd = open (infile, O_RDONLY, 0); |
1230 | if (infd < 0) | |
1231 | { | |
1232 | unexec_error ("cannot open input file `%s'", infile); | |
1233 | } | |
177c0ea7 | 1234 | |
e0f712ba AC |
1235 | outfd = open (outfile, O_WRONLY | O_TRUNC | O_CREAT, 0755); |
1236 | if (outfd < 0) | |
1237 | { | |
1238 | close (infd); | |
1239 | unexec_error ("cannot open output file `%s'", outfile); | |
1240 | } | |
1241 | ||
1242 | build_region_list (); | |
1243 | read_load_commands (); | |
1244 | ||
1245 | find_emacs_zone_regions (); | |
1dd7ccf2 | 1246 | unexec_regions_merge (); |
e0f712ba AC |
1247 | |
1248 | in_dumped_exec = 1; | |
1249 | ||
1250 | dump_it (); | |
1251 | ||
1252 | close (outfd); | |
dd5ecd6b | 1253 | return 0; |
e0f712ba AC |
1254 | } |
1255 | ||
1256 | ||
1257 | void | |
3d608a86 | 1258 | unexec_init_emacs_zone (void) |
e0f712ba AC |
1259 | { |
1260 | emacs_zone = malloc_create_zone (0, 0); | |
1261 | malloc_set_zone_name (emacs_zone, "EmacsZone"); | |
1262 | } | |
1263 | ||
40ef0695 YM |
1264 | #ifndef MACOSX_MALLOC_MULT16 |
1265 | #define MACOSX_MALLOC_MULT16 1 | |
1266 | #endif | |
1267 | ||
1268 | typedef struct unexec_malloc_header { | |
1269 | union { | |
1270 | char c[8]; | |
1271 | size_t size; | |
1272 | } u; | |
1273 | } unexec_malloc_header_t; | |
1274 | ||
1275 | #if MACOSX_MALLOC_MULT16 | |
1276 | ||
1277 | #define ptr_in_unexec_regions(p) ((((vm_address_t) (p)) & 8) != 0) | |
1278 | ||
1279 | #else | |
1280 | ||
e0f712ba AC |
1281 | int |
1282 | ptr_in_unexec_regions (void *ptr) | |
1283 | { | |
1284 | int i; | |
1285 | ||
1286 | for (i = 0; i < num_unexec_regions; i++) | |
c57038f8 YM |
1287 | if ((vm_address_t) ptr - unexec_regions[i].range.address |
1288 | < unexec_regions[i].range.size) | |
e0f712ba AC |
1289 | return 1; |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | ||
40ef0695 YM |
1294 | #endif |
1295 | ||
e0f712ba AC |
1296 | void * |
1297 | unexec_malloc (size_t size) | |
1298 | { | |
1299 | if (in_dumped_exec) | |
40ef0695 YM |
1300 | { |
1301 | void *p; | |
1302 | ||
1303 | p = malloc (size); | |
1304 | #if MACOSX_MALLOC_MULT16 | |
1305 | assert (((vm_address_t) p % 16) == 0); | |
1306 | #endif | |
1307 | return p; | |
1308 | } | |
e0f712ba | 1309 | else |
40ef0695 YM |
1310 | { |
1311 | unexec_malloc_header_t *ptr; | |
1312 | ||
1313 | ptr = (unexec_malloc_header_t *) | |
1314 | malloc_zone_malloc (emacs_zone, size + sizeof (unexec_malloc_header_t)); | |
1315 | ptr->u.size = size; | |
1316 | ptr++; | |
1317 | #if MACOSX_MALLOC_MULT16 | |
1318 | assert (((vm_address_t) ptr % 16) == 8); | |
1319 | #endif | |
1320 | return (void *) ptr; | |
1321 | } | |
e0f712ba AC |
1322 | } |
1323 | ||
1324 | void * | |
1325 | unexec_realloc (void *old_ptr, size_t new_size) | |
1326 | { | |
1327 | if (in_dumped_exec) | |
40ef0695 YM |
1328 | { |
1329 | void *p; | |
1330 | ||
1331 | if (ptr_in_unexec_regions (old_ptr)) | |
1332 | { | |
40ef0695 YM |
1333 | size_t old_size = ((unexec_malloc_header_t *) old_ptr)[-1].u.size; |
1334 | size_t size = new_size > old_size ? old_size : new_size; | |
1335 | ||
0da46b6e | 1336 | p = (size_t *) malloc (new_size); |
40ef0695 YM |
1337 | if (size) |
1338 | memcpy (p, old_ptr, size); | |
1339 | } | |
1340 | else | |
1341 | { | |
1342 | p = realloc (old_ptr, new_size); | |
1343 | } | |
1344 | #if MACOSX_MALLOC_MULT16 | |
1345 | assert (((vm_address_t) p % 16) == 0); | |
1346 | #endif | |
1347 | return p; | |
1348 | } | |
e0f712ba | 1349 | else |
40ef0695 YM |
1350 | { |
1351 | unexec_malloc_header_t *ptr; | |
1352 | ||
1353 | ptr = (unexec_malloc_header_t *) | |
1354 | malloc_zone_realloc (emacs_zone, (unexec_malloc_header_t *) old_ptr - 1, | |
1355 | new_size + sizeof (unexec_malloc_header_t)); | |
1356 | ptr->u.size = new_size; | |
1357 | ptr++; | |
1358 | #if MACOSX_MALLOC_MULT16 | |
1359 | assert (((vm_address_t) ptr % 16) == 8); | |
1360 | #endif | |
1361 | return (void *) ptr; | |
1362 | } | |
e0f712ba AC |
1363 | } |
1364 | ||
1365 | void | |
1366 | unexec_free (void *ptr) | |
1367 | { | |
9c5e177e JM |
1368 | if (ptr == NULL) |
1369 | return; | |
e0f712ba AC |
1370 | if (in_dumped_exec) |
1371 | { | |
1372 | if (!ptr_in_unexec_regions (ptr)) | |
1373 | free (ptr); | |
1374 | } | |
1375 | else | |
40ef0695 | 1376 | malloc_zone_free (emacs_zone, (unexec_malloc_header_t *) ptr - 1); |
e0f712ba | 1377 | } |
ab5796a9 MB |
1378 | |
1379 | /* arch-tag: 1a784f7b-a184-4c4f-9544-da8619593d72 | |
1380 | (do not change this comment) */ |