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cf1061c0 TG |
1 | /* Handle Darwin shared libraries for GDB, the GNU Debugger. |
2 | ||
0b302171 | 3 | Copyright (C) 2009-2012 Free Software Foundation, Inc. |
cf1061c0 TG |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program 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 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | ||
22 | #include "symtab.h" | |
23 | #include "bfd.h" | |
24 | #include "symfile.h" | |
25 | #include "objfiles.h" | |
26 | #include "gdbcore.h" | |
27 | #include "target.h" | |
28 | #include "inferior.h" | |
fb14de7b | 29 | #include "regcache.h" |
cf1061c0 TG |
30 | #include "gdbthread.h" |
31 | ||
32 | #include "gdb_assert.h" | |
33 | ||
34 | #include "solist.h" | |
35 | #include "solib.h" | |
36 | #include "solib-svr4.h" | |
37 | ||
38 | #include "bfd-target.h" | |
39 | #include "elf-bfd.h" | |
40 | #include "exec.h" | |
41 | #include "auxv.h" | |
42 | #include "exceptions.h" | |
43 | #include "mach-o.h" | |
8544a150 | 44 | #include "mach-o/external.h" |
cf1061c0 TG |
45 | |
46 | struct gdb_dyld_image_info | |
47 | { | |
48 | /* Base address (which corresponds to the Mach-O header). */ | |
49 | CORE_ADDR mach_header; | |
50 | /* Image file path. */ | |
51 | CORE_ADDR file_path; | |
52 | /* st.m_time of image file. */ | |
53 | unsigned long mtime; | |
54 | }; | |
55 | ||
066d7383 TG |
56 | /* Content of inferior dyld_all_image_infos structure. |
57 | See /usr/include/mach-o/dyld_images.h for the documentation. */ | |
cf1061c0 TG |
58 | struct gdb_dyld_all_image_infos |
59 | { | |
60 | /* Version (1). */ | |
61 | unsigned int version; | |
62 | /* Number of images. */ | |
63 | unsigned int count; | |
64 | /* Image description. */ | |
65 | CORE_ADDR info; | |
66 | /* Notifier (function called when a library is added or removed). */ | |
67 | CORE_ADDR notifier; | |
68 | }; | |
69 | ||
70 | /* Current all_image_infos version. */ | |
066d7383 | 71 | #define DYLD_VERSION_MIN 1 |
f00c55f8 | 72 | #define DYLD_VERSION_MAX 12 |
cf1061c0 TG |
73 | |
74 | /* Address of structure dyld_all_image_infos in inferior. */ | |
75 | static CORE_ADDR dyld_all_image_addr; | |
76 | ||
77 | /* Gdb copy of dyld_all_info_infos. */ | |
78 | static struct gdb_dyld_all_image_infos dyld_all_image; | |
79 | ||
066d7383 TG |
80 | /* Return non-zero if the version in dyld_all_image is known. */ |
81 | ||
82 | static int | |
83 | darwin_dyld_version_ok (void) | |
84 | { | |
85 | return dyld_all_image.version >= DYLD_VERSION_MIN | |
70d4c673 | 86 | && dyld_all_image.version <= DYLD_VERSION_MAX; |
066d7383 TG |
87 | } |
88 | ||
cf1061c0 | 89 | /* Read dyld_all_image from inferior. */ |
066d7383 | 90 | |
cf1061c0 TG |
91 | static void |
92 | darwin_load_image_infos (void) | |
93 | { | |
94 | gdb_byte buf[24]; | |
e17a4113 | 95 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
cf1061c0 TG |
96 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
97 | int len; | |
98 | ||
99 | /* If the structure address is not known, don't continue. */ | |
100 | if (dyld_all_image_addr == 0) | |
101 | return; | |
102 | ||
103 | /* The structure has 4 fields: version (4 bytes), count (4 bytes), | |
104 | info (pointer) and notifier (pointer). */ | |
105 | len = 4 + 4 + 2 * ptr_type->length; | |
106 | gdb_assert (len <= sizeof (buf)); | |
107 | memset (&dyld_all_image, 0, sizeof (dyld_all_image)); | |
108 | ||
109 | /* Read structure raw bytes from target. */ | |
110 | if (target_read_memory (dyld_all_image_addr, buf, len)) | |
111 | return; | |
112 | ||
113 | /* Extract the fields. */ | |
e17a4113 | 114 | dyld_all_image.version = extract_unsigned_integer (buf, 4, byte_order); |
066d7383 | 115 | if (!darwin_dyld_version_ok ()) |
cf1061c0 TG |
116 | return; |
117 | ||
e17a4113 | 118 | dyld_all_image.count = extract_unsigned_integer (buf + 4, 4, byte_order); |
cf1061c0 TG |
119 | dyld_all_image.info = extract_typed_address (buf + 8, ptr_type); |
120 | dyld_all_image.notifier = extract_typed_address | |
121 | (buf + 8 + ptr_type->length, ptr_type); | |
122 | } | |
123 | ||
124 | /* Link map info to include in an allocated so_list entry. */ | |
125 | ||
126 | struct lm_info | |
127 | { | |
128 | /* The target location of lm. */ | |
129 | CORE_ADDR lm_addr; | |
130 | }; | |
131 | ||
132 | struct darwin_so_list | |
133 | { | |
134 | /* Common field. */ | |
135 | struct so_list sl; | |
136 | /* Darwin specific data. */ | |
137 | struct lm_info li; | |
138 | }; | |
139 | ||
140 | /* Lookup the value for a specific symbol. */ | |
066d7383 | 141 | |
cf1061c0 TG |
142 | static CORE_ADDR |
143 | lookup_symbol_from_bfd (bfd *abfd, char *symname) | |
144 | { | |
145 | long storage_needed; | |
146 | asymbol **symbol_table; | |
147 | unsigned int number_of_symbols; | |
148 | unsigned int i; | |
149 | CORE_ADDR symaddr = 0; | |
150 | ||
151 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
152 | ||
153 | if (storage_needed <= 0) | |
154 | return 0; | |
155 | ||
156 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
157 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
70d4c673 | 158 | |
cf1061c0 TG |
159 | for (i = 0; i < number_of_symbols; i++) |
160 | { | |
161 | asymbol *sym = symbol_table[i]; | |
433759f7 | 162 | |
cf1061c0 TG |
163 | if (strcmp (sym->name, symname) == 0 |
164 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) | |
165 | { | |
166 | /* BFD symbols are section relative. */ | |
167 | symaddr = sym->value + sym->section->vma; | |
168 | break; | |
169 | } | |
170 | } | |
171 | xfree (symbol_table); | |
172 | ||
173 | return symaddr; | |
174 | } | |
175 | ||
176 | /* Return program interpreter string. */ | |
023e4e81 | 177 | |
cf1061c0 TG |
178 | static gdb_byte * |
179 | find_program_interpreter (void) | |
180 | { | |
181 | gdb_byte *buf = NULL; | |
182 | ||
023e4e81 | 183 | /* If we have an exec_bfd, get the interpreter from the load commands. */ |
cf1061c0 TG |
184 | if (exec_bfd) |
185 | { | |
023e4e81 | 186 | bfd_mach_o_load_command *cmd; |
70d4c673 | 187 | |
023e4e81 TG |
188 | if (bfd_mach_o_lookup_command (exec_bfd, |
189 | BFD_MACH_O_LC_LOAD_DYLINKER, &cmd) == 1) | |
190 | return cmd->command.dylinker.name_str; | |
cf1061c0 TG |
191 | } |
192 | ||
193 | /* If we didn't find it, read from memory. | |
194 | FIXME: todo. */ | |
195 | return buf; | |
196 | } | |
197 | ||
198 | /* Not used. I don't see how the main symbol file can be found: the | |
199 | interpreter name is needed and it is known from the executable file. | |
200 | Note that darwin-nat.c implements pid_to_exec_file. */ | |
066d7383 | 201 | |
cf1061c0 TG |
202 | static int |
203 | open_symbol_file_object (void *from_ttyp) | |
204 | { | |
205 | return 0; | |
206 | } | |
207 | ||
c378eb4e | 208 | /* Build a list of currently loaded shared objects. See solib-svr4.c. */ |
066d7383 | 209 | |
cf1061c0 TG |
210 | static struct so_list * |
211 | darwin_current_sos (void) | |
212 | { | |
213 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; | |
8544a150 | 214 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
cf1061c0 TG |
215 | int ptr_len = TYPE_LENGTH (ptr_type); |
216 | unsigned int image_info_size; | |
217 | CORE_ADDR lm; | |
218 | struct so_list *head = NULL; | |
219 | struct so_list *tail = NULL; | |
220 | int i; | |
221 | ||
222 | /* Be sure image infos are loaded. */ | |
223 | darwin_load_image_infos (); | |
224 | ||
066d7383 | 225 | if (!darwin_dyld_version_ok ()) |
cf1061c0 TG |
226 | return NULL; |
227 | ||
228 | image_info_size = ptr_len * 3; | |
229 | ||
230 | /* Read infos for each solib. | |
8544a150 TG |
231 | The first entry was rumored to be the executable itself, but this is not |
232 | true when a large number of shared libraries are used (table expanded ?). | |
233 | We now check all entries, but discard executable images. */ | |
234 | for (i = 0; i < dyld_all_image.count; i++) | |
cf1061c0 TG |
235 | { |
236 | CORE_ADDR info = dyld_all_image.info + i * image_info_size; | |
237 | char buf[image_info_size]; | |
238 | CORE_ADDR load_addr; | |
239 | CORE_ADDR path_addr; | |
8544a150 TG |
240 | struct mach_o_header_external hdr; |
241 | unsigned long hdr_val; | |
cf1061c0 TG |
242 | char *file_path; |
243 | int errcode; | |
244 | struct darwin_so_list *dnew; | |
245 | struct so_list *new; | |
246 | struct cleanup *old_chain; | |
247 | ||
248 | /* Read image info from inferior. */ | |
249 | if (target_read_memory (info, buf, image_info_size)) | |
250 | break; | |
251 | ||
252 | load_addr = extract_typed_address (buf, ptr_type); | |
253 | path_addr = extract_typed_address (buf + ptr_len, ptr_type); | |
254 | ||
8544a150 TG |
255 | /* Read Mach-O header from memory. */ |
256 | if (target_read_memory (load_addr, (char *) &hdr, sizeof (hdr) - 4)) | |
257 | break; | |
258 | /* Discard wrong magic numbers. Shouldn't happen. */ | |
259 | hdr_val = extract_unsigned_integer | |
260 | (hdr.magic, sizeof (hdr.magic), byte_order); | |
261 | if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64) | |
262 | continue; | |
263 | /* Discard executable. Should happen only once. */ | |
264 | hdr_val = extract_unsigned_integer | |
265 | (hdr.filetype, sizeof (hdr.filetype), byte_order); | |
266 | if (hdr_val == BFD_MACH_O_MH_EXECUTE) | |
267 | continue; | |
268 | ||
cf1061c0 TG |
269 | target_read_string (path_addr, &file_path, |
270 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
271 | if (errcode) | |
272 | break; | |
273 | ||
274 | /* Create and fill the new so_list element. */ | |
275 | dnew = XZALLOC (struct darwin_so_list); | |
276 | new = &dnew->sl; | |
277 | old_chain = make_cleanup (xfree, dnew); | |
278 | ||
279 | new->lm_info = &dnew->li; | |
280 | ||
281 | strncpy (new->so_name, file_path, SO_NAME_MAX_PATH_SIZE - 1); | |
282 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
283 | strcpy (new->so_original_name, new->so_name); | |
284 | xfree (file_path); | |
285 | new->lm_info->lm_addr = load_addr; | |
286 | ||
287 | if (head == NULL) | |
288 | head = new; | |
289 | else | |
290 | tail->next = new; | |
291 | tail = new; | |
292 | ||
293 | discard_cleanups (old_chain); | |
294 | } | |
295 | ||
296 | return head; | |
297 | } | |
298 | ||
299 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
300 | run time loader. */ | |
066d7383 | 301 | |
693be288 | 302 | static int |
cf1061c0 TG |
303 | darwin_in_dynsym_resolve_code (CORE_ADDR pc) |
304 | { | |
305 | return 0; | |
306 | } | |
307 | ||
308 | ||
309 | /* No special symbol handling. */ | |
066d7383 | 310 | |
cf1061c0 TG |
311 | static void |
312 | darwin_special_symbol_handling (void) | |
313 | { | |
314 | } | |
315 | ||
f00c55f8 TG |
316 | /* Extract dyld_all_image_addr when the process was just created, assuming the |
317 | current PC is at the entry of the dynamic linker. */ | |
066d7383 | 318 | |
cf1061c0 | 319 | static void |
f00c55f8 | 320 | darwin_solib_get_all_image_info_addr_at_init (void) |
cf1061c0 | 321 | { |
cf1061c0 | 322 | gdb_byte *interp_name; |
cf1061c0 | 323 | CORE_ADDR load_addr = 0; |
cf1061c0 | 324 | bfd *dyld_bfd = NULL; |
f00c55f8 TG |
325 | |
326 | /* This method doesn't work with an attached process. */ | |
327 | if (current_inferior ()->attach_flag) | |
328 | return; | |
cf1061c0 | 329 | |
cf1061c0 TG |
330 | /* Find the program interpreter. */ |
331 | interp_name = find_program_interpreter (); | |
332 | if (!interp_name) | |
333 | return; | |
334 | ||
335 | /* Create a bfd for the interpreter. */ | |
cf1061c0 TG |
336 | dyld_bfd = bfd_openr (interp_name, gnutarget); |
337 | if (dyld_bfd) | |
338 | { | |
339 | bfd *sub; | |
433759f7 | 340 | |
cf1061c0 | 341 | sub = bfd_mach_o_fat_extract (dyld_bfd, bfd_object, |
a97b0ac8 | 342 | gdbarch_bfd_arch_info (target_gdbarch)); |
cf1061c0 TG |
343 | if (sub) |
344 | dyld_bfd = sub; | |
345 | else | |
346 | { | |
347 | bfd_close (dyld_bfd); | |
348 | dyld_bfd = NULL; | |
349 | } | |
350 | } | |
351 | if (!dyld_bfd) | |
023e4e81 | 352 | return; |
70d4c673 | 353 | |
f00c55f8 TG |
354 | /* We find the dynamic linker's base address by examining |
355 | the current pc (which should point at the entry point for the | |
356 | dynamic linker) and subtracting the offset of the entry point. */ | |
357 | load_addr = (regcache_read_pc (get_current_regcache ()) | |
358 | - bfd_get_start_address (dyld_bfd)); | |
cf1061c0 TG |
359 | |
360 | /* Now try to set a breakpoint in the dynamic linker. */ | |
361 | dyld_all_image_addr = | |
362 | lookup_symbol_from_bfd (dyld_bfd, "_dyld_all_image_infos"); | |
70d4c673 | 363 | |
cf1061c0 | 364 | bfd_close (dyld_bfd); |
cf1061c0 TG |
365 | |
366 | if (dyld_all_image_addr == 0) | |
367 | return; | |
368 | ||
369 | dyld_all_image_addr += load_addr; | |
f00c55f8 TG |
370 | } |
371 | ||
372 | /* Extract dyld_all_image_addr reading it from | |
373 | TARGET_OBJECT_DARWIN_DYLD_INFO. */ | |
374 | ||
375 | static void | |
376 | darwin_solib_read_all_image_info_addr (void) | |
377 | { | |
378 | gdb_byte buf[8 + 8 + 4]; | |
379 | LONGEST len; | |
380 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
381 | ||
382 | len = target_read (¤t_target, TARGET_OBJECT_DARWIN_DYLD_INFO, NULL, | |
383 | buf, 0, sizeof (buf)); | |
384 | if (len != sizeof (buf)) | |
385 | return; | |
386 | ||
387 | dyld_all_image_addr = extract_unsigned_integer (buf, 8, byte_order); | |
388 | } | |
389 | ||
390 | /* Shared library startup support. See documentation in solib-svr4.c. */ | |
391 | ||
392 | static void | |
393 | darwin_solib_create_inferior_hook (int from_tty) | |
394 | { | |
395 | dyld_all_image_addr = 0; | |
396 | ||
397 | darwin_solib_read_all_image_info_addr (); | |
398 | ||
399 | if (dyld_all_image_addr == 0) | |
400 | darwin_solib_get_all_image_info_addr_at_init (); | |
401 | ||
402 | if (dyld_all_image_addr == 0) | |
403 | return; | |
cf1061c0 TG |
404 | |
405 | darwin_load_image_infos (); | |
406 | ||
066d7383 | 407 | if (darwin_dyld_version_ok ()) |
a6d9a66e | 408 | create_solib_event_breakpoint (target_gdbarch, dyld_all_image.notifier); |
cf1061c0 TG |
409 | } |
410 | ||
411 | static void | |
412 | darwin_clear_solib (void) | |
413 | { | |
414 | dyld_all_image_addr = 0; | |
415 | dyld_all_image.version = 0; | |
416 | } | |
417 | ||
418 | static void | |
419 | darwin_free_so (struct so_list *so) | |
420 | { | |
421 | } | |
422 | ||
423 | /* The section table is built from bfd sections using bfd VMAs. | |
424 | Relocate these VMAs according to solib info. */ | |
066d7383 | 425 | |
cf1061c0 TG |
426 | static void |
427 | darwin_relocate_section_addresses (struct so_list *so, | |
0542c86d | 428 | struct target_section *sec) |
cf1061c0 TG |
429 | { |
430 | sec->addr += so->lm_info->lm_addr; | |
431 | sec->endaddr += so->lm_info->lm_addr; | |
432 | ||
433 | /* Best effort to set addr_high/addr_low. This is used only by | |
434 | 'info sharedlibary'. */ | |
435 | if (so->addr_high == 0) | |
436 | { | |
437 | so->addr_low = sec->addr; | |
438 | so->addr_high = sec->endaddr; | |
439 | } | |
440 | if (sec->endaddr > so->addr_high) | |
441 | so->addr_high = sec->endaddr; | |
442 | if (sec->addr < so->addr_low) | |
443 | so->addr_low = sec->addr; | |
444 | } | |
445 | \f | |
446 | static struct symbol * | |
447 | darwin_lookup_lib_symbol (const struct objfile *objfile, | |
448 | const char *name, | |
cf1061c0 TG |
449 | const domain_enum domain) |
450 | { | |
451 | return NULL; | |
452 | } | |
453 | ||
454 | static bfd * | |
455 | darwin_bfd_open (char *pathname) | |
456 | { | |
457 | char *found_pathname; | |
458 | int found_file; | |
459 | bfd *abfd; | |
460 | bfd *res; | |
461 | ||
462 | /* Search for shared library file. */ | |
463 | found_pathname = solib_find (pathname, &found_file); | |
464 | if (found_pathname == NULL) | |
465 | perror_with_name (pathname); | |
466 | ||
467 | /* Open bfd for shared library. */ | |
468 | abfd = solib_bfd_fopen (found_pathname, found_file); | |
469 | ||
470 | res = bfd_mach_o_fat_extract (abfd, bfd_object, | |
a97b0ac8 | 471 | gdbarch_bfd_arch_info (target_gdbarch)); |
cf1061c0 TG |
472 | if (!res) |
473 | { | |
474 | bfd_close (abfd); | |
475 | make_cleanup (xfree, found_pathname); | |
476 | error (_("`%s': not a shared-library: %s"), | |
477 | found_pathname, bfd_errmsg (bfd_get_error ())); | |
478 | } | |
4b2d20a5 TG |
479 | |
480 | /* Make sure that the filename is malloc'ed. The current filename | |
481 | for fat-binaries BFDs is a name that was generated by BFD, usually | |
482 | a static string containing the name of the architecture. */ | |
483 | res->filename = xstrdup (pathname); | |
484 | ||
cf1061c0 TG |
485 | return res; |
486 | } | |
487 | ||
488 | struct target_so_ops darwin_so_ops; | |
489 | ||
693be288 JK |
490 | /* -Wmissing-prototypes */ |
491 | extern initialize_file_ftype _initialize_darwin_solib; | |
492 | ||
cf1061c0 TG |
493 | void |
494 | _initialize_darwin_solib (void) | |
495 | { | |
496 | darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses; | |
497 | darwin_so_ops.free_so = darwin_free_so; | |
498 | darwin_so_ops.clear_solib = darwin_clear_solib; | |
499 | darwin_so_ops.solib_create_inferior_hook = darwin_solib_create_inferior_hook; | |
500 | darwin_so_ops.special_symbol_handling = darwin_special_symbol_handling; | |
501 | darwin_so_ops.current_sos = darwin_current_sos; | |
502 | darwin_so_ops.open_symbol_file_object = open_symbol_file_object; | |
503 | darwin_so_ops.in_dynsym_resolve_code = darwin_in_dynsym_resolve_code; | |
504 | darwin_so_ops.lookup_lib_global_symbol = darwin_lookup_lib_symbol; | |
505 | darwin_so_ops.bfd_open = darwin_bfd_open; | |
506 | } |