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cf1061c0 TG |
1 | /* Handle Darwin shared libraries for GDB, the GNU Debugger. |
2 | ||
42a4f53d | 3 | Copyright (C) 2009-2019 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 | 30 | #include "gdbthread.h" |
cbb099e8 | 31 | #include "gdb_bfd.h" |
cf1061c0 | 32 | |
cf1061c0 TG |
33 | #include "solist.h" |
34 | #include "solib.h" | |
35 | #include "solib-svr4.h" | |
36 | ||
37 | #include "bfd-target.h" | |
38 | #include "elf-bfd.h" | |
39 | #include "exec.h" | |
40 | #include "auxv.h" | |
cf1061c0 | 41 | #include "mach-o.h" |
8544a150 | 42 | #include "mach-o/external.h" |
cf1061c0 TG |
43 | |
44 | struct gdb_dyld_image_info | |
45 | { | |
46 | /* Base address (which corresponds to the Mach-O header). */ | |
47 | CORE_ADDR mach_header; | |
48 | /* Image file path. */ | |
49 | CORE_ADDR file_path; | |
50 | /* st.m_time of image file. */ | |
51 | unsigned long mtime; | |
52 | }; | |
53 | ||
066d7383 TG |
54 | /* Content of inferior dyld_all_image_infos structure. |
55 | See /usr/include/mach-o/dyld_images.h for the documentation. */ | |
cf1061c0 TG |
56 | struct gdb_dyld_all_image_infos |
57 | { | |
58 | /* Version (1). */ | |
59 | unsigned int version; | |
60 | /* Number of images. */ | |
61 | unsigned int count; | |
62 | /* Image description. */ | |
63 | CORE_ADDR info; | |
64 | /* Notifier (function called when a library is added or removed). */ | |
65 | CORE_ADDR notifier; | |
66 | }; | |
67 | ||
68 | /* Current all_image_infos version. */ | |
066d7383 | 69 | #define DYLD_VERSION_MIN 1 |
4bbd4ef2 | 70 | #define DYLD_VERSION_MAX 15 |
cf1061c0 | 71 | |
ec95993c TG |
72 | /* Per PSPACE specific data. */ |
73 | struct darwin_info | |
74 | { | |
75 | /* Address of structure dyld_all_image_infos in inferior. */ | |
76 | CORE_ADDR all_image_addr; | |
77 | ||
78 | /* Gdb copy of dyld_all_info_infos. */ | |
79 | struct gdb_dyld_all_image_infos all_image; | |
80 | }; | |
81 | ||
82 | /* Per-program-space data key. */ | |
83 | static const struct program_space_data *solib_darwin_pspace_data; | |
84 | ||
85 | static void | |
86 | darwin_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
87 | { | |
487ad57c | 88 | xfree (arg); |
ec95993c | 89 | } |
cf1061c0 | 90 | |
ec95993c TG |
91 | /* Get the current darwin data. If none is found yet, add it now. This |
92 | function always returns a valid object. */ | |
93 | ||
94 | static struct darwin_info * | |
95 | get_darwin_info (void) | |
96 | { | |
97 | struct darwin_info *info; | |
98 | ||
19ba03f4 SM |
99 | info = (struct darwin_info *) program_space_data (current_program_space, |
100 | solib_darwin_pspace_data); | |
ec95993c TG |
101 | if (info != NULL) |
102 | return info; | |
103 | ||
41bf6aca | 104 | info = XCNEW (struct darwin_info); |
ec95993c TG |
105 | set_program_space_data (current_program_space, |
106 | solib_darwin_pspace_data, info); | |
107 | return info; | |
108 | } | |
cf1061c0 | 109 | |
066d7383 TG |
110 | /* Return non-zero if the version in dyld_all_image is known. */ |
111 | ||
112 | static int | |
ec95993c | 113 | darwin_dyld_version_ok (const struct darwin_info *info) |
066d7383 | 114 | { |
ec95993c TG |
115 | return info->all_image.version >= DYLD_VERSION_MIN |
116 | && info->all_image.version <= DYLD_VERSION_MAX; | |
066d7383 TG |
117 | } |
118 | ||
cf1061c0 | 119 | /* Read dyld_all_image from inferior. */ |
066d7383 | 120 | |
cf1061c0 | 121 | static void |
ec95993c | 122 | darwin_load_image_infos (struct darwin_info *info) |
cf1061c0 TG |
123 | { |
124 | gdb_byte buf[24]; | |
f5656ead TT |
125 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
126 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
cf1061c0 TG |
127 | int len; |
128 | ||
129 | /* If the structure address is not known, don't continue. */ | |
ec95993c | 130 | if (info->all_image_addr == 0) |
cf1061c0 TG |
131 | return; |
132 | ||
133 | /* The structure has 4 fields: version (4 bytes), count (4 bytes), | |
134 | info (pointer) and notifier (pointer). */ | |
132874d7 | 135 | len = 4 + 4 + 2 * TYPE_LENGTH (ptr_type); |
cf1061c0 | 136 | gdb_assert (len <= sizeof (buf)); |
ec95993c | 137 | memset (&info->all_image, 0, sizeof (info->all_image)); |
cf1061c0 TG |
138 | |
139 | /* Read structure raw bytes from target. */ | |
ec95993c | 140 | if (target_read_memory (info->all_image_addr, buf, len)) |
cf1061c0 TG |
141 | return; |
142 | ||
143 | /* Extract the fields. */ | |
ec95993c TG |
144 | info->all_image.version = extract_unsigned_integer (buf, 4, byte_order); |
145 | if (!darwin_dyld_version_ok (info)) | |
cf1061c0 TG |
146 | return; |
147 | ||
ec95993c TG |
148 | info->all_image.count = extract_unsigned_integer (buf + 4, 4, byte_order); |
149 | info->all_image.info = extract_typed_address (buf + 8, ptr_type); | |
150 | info->all_image.notifier = extract_typed_address | |
132874d7 | 151 | (buf + 8 + TYPE_LENGTH (ptr_type), ptr_type); |
cf1061c0 TG |
152 | } |
153 | ||
154 | /* Link map info to include in an allocated so_list entry. */ | |
155 | ||
d0e449a1 | 156 | struct lm_info_darwin : public lm_info_base |
cf1061c0 TG |
157 | { |
158 | /* The target location of lm. */ | |
9ccbfd7b | 159 | CORE_ADDR lm_addr = 0; |
cf1061c0 TG |
160 | }; |
161 | ||
cf1061c0 | 162 | /* Lookup the value for a specific symbol. */ |
066d7383 | 163 | |
cf1061c0 | 164 | static CORE_ADDR |
a121b7c1 | 165 | lookup_symbol_from_bfd (bfd *abfd, const char *symname) |
cf1061c0 TG |
166 | { |
167 | long storage_needed; | |
168 | asymbol **symbol_table; | |
169 | unsigned int number_of_symbols; | |
170 | unsigned int i; | |
171 | CORE_ADDR symaddr = 0; | |
172 | ||
173 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
174 | ||
175 | if (storage_needed <= 0) | |
176 | return 0; | |
177 | ||
178 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
179 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
70d4c673 | 180 | |
cf1061c0 TG |
181 | for (i = 0; i < number_of_symbols; i++) |
182 | { | |
183 | asymbol *sym = symbol_table[i]; | |
433759f7 | 184 | |
cf1061c0 TG |
185 | if (strcmp (sym->name, symname) == 0 |
186 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) | |
187 | { | |
188 | /* BFD symbols are section relative. */ | |
189 | symaddr = sym->value + sym->section->vma; | |
190 | break; | |
191 | } | |
192 | } | |
193 | xfree (symbol_table); | |
194 | ||
195 | return symaddr; | |
196 | } | |
197 | ||
198 | /* Return program interpreter string. */ | |
023e4e81 | 199 | |
001f13d8 | 200 | static char * |
cf1061c0 TG |
201 | find_program_interpreter (void) |
202 | { | |
001f13d8 | 203 | char *buf = NULL; |
cf1061c0 | 204 | |
023e4e81 | 205 | /* If we have an exec_bfd, get the interpreter from the load commands. */ |
cf1061c0 TG |
206 | if (exec_bfd) |
207 | { | |
023e4e81 | 208 | bfd_mach_o_load_command *cmd; |
70d4c673 | 209 | |
023e4e81 TG |
210 | if (bfd_mach_o_lookup_command (exec_bfd, |
211 | BFD_MACH_O_LC_LOAD_DYLINKER, &cmd) == 1) | |
212 | return cmd->command.dylinker.name_str; | |
cf1061c0 TG |
213 | } |
214 | ||
215 | /* If we didn't find it, read from memory. | |
216 | FIXME: todo. */ | |
217 | return buf; | |
218 | } | |
219 | ||
220 | /* Not used. I don't see how the main symbol file can be found: the | |
221 | interpreter name is needed and it is known from the executable file. | |
222 | Note that darwin-nat.c implements pid_to_exec_file. */ | |
066d7383 | 223 | |
cf1061c0 | 224 | static int |
bf469271 | 225 | open_symbol_file_object (int from_tty) |
cf1061c0 TG |
226 | { |
227 | return 0; | |
228 | } | |
229 | ||
c378eb4e | 230 | /* Build a list of currently loaded shared objects. See solib-svr4.c. */ |
066d7383 | 231 | |
cf1061c0 TG |
232 | static struct so_list * |
233 | darwin_current_sos (void) | |
234 | { | |
f5656ead TT |
235 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
236 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
cf1061c0 TG |
237 | int ptr_len = TYPE_LENGTH (ptr_type); |
238 | unsigned int image_info_size; | |
cf1061c0 TG |
239 | struct so_list *head = NULL; |
240 | struct so_list *tail = NULL; | |
241 | int i; | |
ec95993c | 242 | struct darwin_info *info = get_darwin_info (); |
cf1061c0 TG |
243 | |
244 | /* Be sure image infos are loaded. */ | |
ec95993c | 245 | darwin_load_image_infos (info); |
cf1061c0 | 246 | |
ec95993c | 247 | if (!darwin_dyld_version_ok (info)) |
cf1061c0 TG |
248 | return NULL; |
249 | ||
250 | image_info_size = ptr_len * 3; | |
251 | ||
252 | /* Read infos for each solib. | |
8544a150 TG |
253 | The first entry was rumored to be the executable itself, but this is not |
254 | true when a large number of shared libraries are used (table expanded ?). | |
255 | We now check all entries, but discard executable images. */ | |
ec95993c | 256 | for (i = 0; i < info->all_image.count; i++) |
cf1061c0 | 257 | { |
ec95993c | 258 | CORE_ADDR iinfo = info->all_image.info + i * image_info_size; |
e362b510 | 259 | gdb_byte buf[image_info_size]; |
cf1061c0 TG |
260 | CORE_ADDR load_addr; |
261 | CORE_ADDR path_addr; | |
8544a150 TG |
262 | struct mach_o_header_external hdr; |
263 | unsigned long hdr_val; | |
e83e4e24 | 264 | gdb::unique_xmalloc_ptr<char> file_path; |
cf1061c0 | 265 | int errcode; |
cf1061c0 TG |
266 | |
267 | /* Read image info from inferior. */ | |
ec95993c | 268 | if (target_read_memory (iinfo, buf, image_info_size)) |
cf1061c0 TG |
269 | break; |
270 | ||
271 | load_addr = extract_typed_address (buf, ptr_type); | |
272 | path_addr = extract_typed_address (buf + ptr_len, ptr_type); | |
273 | ||
8544a150 | 274 | /* Read Mach-O header from memory. */ |
948f8e3d | 275 | if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4)) |
8544a150 TG |
276 | break; |
277 | /* Discard wrong magic numbers. Shouldn't happen. */ | |
278 | hdr_val = extract_unsigned_integer | |
279 | (hdr.magic, sizeof (hdr.magic), byte_order); | |
280 | if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64) | |
281 | continue; | |
282 | /* Discard executable. Should happen only once. */ | |
283 | hdr_val = extract_unsigned_integer | |
284 | (hdr.filetype, sizeof (hdr.filetype), byte_order); | |
285 | if (hdr_val == BFD_MACH_O_MH_EXECUTE) | |
286 | continue; | |
287 | ||
cf1061c0 TG |
288 | target_read_string (path_addr, &file_path, |
289 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
290 | if (errcode) | |
291 | break; | |
292 | ||
293 | /* Create and fill the new so_list element. */ | |
668eb2f0 | 294 | gdb::unique_xmalloc_ptr<struct so_list> newobj (XCNEW (struct so_list)); |
cf1061c0 | 295 | |
9ccbfd7b | 296 | lm_info_darwin *li = new lm_info_darwin; |
d0e449a1 | 297 | newobj->lm_info = li; |
cf1061c0 | 298 | |
e83e4e24 | 299 | strncpy (newobj->so_name, file_path.get (), SO_NAME_MAX_PATH_SIZE - 1); |
fe978cb0 PA |
300 | newobj->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
301 | strcpy (newobj->so_original_name, newobj->so_name); | |
d0e449a1 | 302 | li->lm_addr = load_addr; |
cf1061c0 TG |
303 | |
304 | if (head == NULL) | |
668eb2f0 | 305 | head = newobj.get (); |
cf1061c0 | 306 | else |
668eb2f0 TT |
307 | tail->next = newobj.get (); |
308 | tail = newobj.release (); | |
cf1061c0 TG |
309 | } |
310 | ||
311 | return head; | |
312 | } | |
313 | ||
ad2073b0 TG |
314 | /* Check LOAD_ADDR points to a Mach-O executable header. Return LOAD_ADDR |
315 | in case of success, 0 in case of failure. */ | |
4141a416 JB |
316 | |
317 | static CORE_ADDR | |
ad2073b0 TG |
318 | darwin_validate_exec_header (CORE_ADDR load_addr) |
319 | { | |
320 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
321 | struct mach_o_header_external hdr; | |
322 | unsigned long hdr_val; | |
323 | ||
324 | /* Read Mach-O header from memory. */ | |
325 | if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4)) | |
326 | return 0; | |
327 | ||
328 | /* Discard wrong magic numbers. Shouldn't happen. */ | |
329 | hdr_val = extract_unsigned_integer | |
330 | (hdr.magic, sizeof (hdr.magic), byte_order); | |
331 | if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64) | |
332 | return 0; | |
333 | ||
334 | /* Check executable. */ | |
335 | hdr_val = extract_unsigned_integer | |
336 | (hdr.filetype, sizeof (hdr.filetype), byte_order); | |
337 | if (hdr_val == BFD_MACH_O_MH_EXECUTE) | |
338 | return load_addr; | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
343 | /* Get the load address of the executable using dyld list of images. | |
344 | We assume that the dyld info are correct (which is wrong if the target | |
345 | is stopped at the first instruction). */ | |
346 | ||
347 | static CORE_ADDR | |
348 | darwin_read_exec_load_addr_from_dyld (struct darwin_info *info) | |
4141a416 JB |
349 | { |
350 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
4141a416 JB |
351 | int ptr_len = TYPE_LENGTH (ptr_type); |
352 | unsigned int image_info_size = ptr_len * 3; | |
353 | int i; | |
354 | ||
355 | /* Read infos for each solib. One of them should be the executable. */ | |
356 | for (i = 0; i < info->all_image.count; i++) | |
357 | { | |
358 | CORE_ADDR iinfo = info->all_image.info + i * image_info_size; | |
e362b510 | 359 | gdb_byte buf[image_info_size]; |
4141a416 | 360 | CORE_ADDR load_addr; |
4141a416 JB |
361 | |
362 | /* Read image info from inferior. */ | |
363 | if (target_read_memory (iinfo, buf, image_info_size)) | |
364 | break; | |
365 | ||
366 | load_addr = extract_typed_address (buf, ptr_type); | |
ad2073b0 | 367 | if (darwin_validate_exec_header (load_addr) == load_addr) |
4141a416 JB |
368 | return load_addr; |
369 | } | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
ad2073b0 TG |
374 | /* Get the load address of the executable when the PC is at the dyld |
375 | entry point using parameter passed by the kernel (at SP). */ | |
376 | ||
377 | static CORE_ADDR | |
378 | darwin_read_exec_load_addr_at_init (struct darwin_info *info) | |
379 | { | |
380 | struct gdbarch *gdbarch = target_gdbarch (); | |
381 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
382 | int addr_size = gdbarch_addr_bit (gdbarch) / 8; | |
383 | ULONGEST load_ptr_addr; | |
384 | ULONGEST load_addr; | |
385 | gdb_byte buf[8]; | |
386 | ||
387 | /* Get SP. */ | |
388 | if (regcache_cooked_read_unsigned (get_current_regcache (), | |
389 | gdbarch_sp_regnum (gdbarch), | |
390 | &load_ptr_addr) != REG_VALID) | |
391 | return 0; | |
392 | ||
393 | /* Read value at SP (image load address). */ | |
394 | if (target_read_memory (load_ptr_addr, buf, addr_size)) | |
395 | return 0; | |
396 | ||
397 | load_addr = extract_unsigned_integer (buf, addr_size, byte_order); | |
398 | ||
399 | return darwin_validate_exec_header (load_addr); | |
400 | } | |
401 | ||
cf1061c0 TG |
402 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
403 | run time loader. */ | |
066d7383 | 404 | |
693be288 | 405 | static int |
cf1061c0 TG |
406 | darwin_in_dynsym_resolve_code (CORE_ADDR pc) |
407 | { | |
408 | return 0; | |
409 | } | |
410 | ||
0cd61f44 TT |
411 | /* A wrapper for bfd_mach_o_fat_extract that handles reference |
412 | counting properly. This will either return NULL, or return a new | |
413 | reference to a BFD. */ | |
414 | ||
192b62ce | 415 | static gdb_bfd_ref_ptr |
0cd61f44 TT |
416 | gdb_bfd_mach_o_fat_extract (bfd *abfd, bfd_format format, |
417 | const bfd_arch_info_type *arch) | |
418 | { | |
419 | bfd *result = bfd_mach_o_fat_extract (abfd, format, arch); | |
420 | ||
421 | if (result == NULL) | |
422 | return NULL; | |
423 | ||
424 | if (result == abfd) | |
425 | gdb_bfd_ref (result); | |
426 | else | |
427 | gdb_bfd_mark_parent (result, abfd); | |
428 | ||
192b62ce | 429 | return gdb_bfd_ref_ptr (result); |
0cd61f44 TT |
430 | } |
431 | ||
79b32f4a | 432 | /* Return the BFD for the program interpreter. */ |
066d7383 | 433 | |
79b32f4a XR |
434 | static gdb_bfd_ref_ptr |
435 | darwin_get_dyld_bfd () | |
cf1061c0 | 436 | { |
001f13d8 | 437 | char *interp_name; |
f00c55f8 TG |
438 | |
439 | /* This method doesn't work with an attached process. */ | |
440 | if (current_inferior ()->attach_flag) | |
79b32f4a | 441 | return NULL; |
cf1061c0 | 442 | |
cf1061c0 TG |
443 | /* Find the program interpreter. */ |
444 | interp_name = find_program_interpreter (); | |
445 | if (!interp_name) | |
79b32f4a | 446 | return NULL; |
cf1061c0 TG |
447 | |
448 | /* Create a bfd for the interpreter. */ | |
192b62ce TT |
449 | gdb_bfd_ref_ptr dyld_bfd (gdb_bfd_open (interp_name, gnutarget, -1)); |
450 | if (dyld_bfd != NULL) | |
cf1061c0 | 451 | { |
192b62ce TT |
452 | gdb_bfd_ref_ptr sub |
453 | (gdb_bfd_mach_o_fat_extract (dyld_bfd.get (), bfd_object, | |
454 | gdbarch_bfd_arch_info (target_gdbarch ()))); | |
cd5a152c | 455 | dyld_bfd = sub; |
d6ad71ba | 456 | } |
79b32f4a XR |
457 | return dyld_bfd; |
458 | } | |
459 | ||
460 | /* Extract dyld_all_image_addr when the process was just created, assuming the | |
461 | current PC is at the entry of the dynamic linker. */ | |
462 | ||
463 | static void | |
464 | darwin_solib_get_all_image_info_addr_at_init (struct darwin_info *info) | |
465 | { | |
466 | CORE_ADDR load_addr = 0; | |
467 | gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd (); | |
468 | ||
192b62ce TT |
469 | if (dyld_bfd == NULL) |
470 | return; | |
70d4c673 | 471 | |
f00c55f8 TG |
472 | /* We find the dynamic linker's base address by examining |
473 | the current pc (which should point at the entry point for the | |
474 | dynamic linker) and subtracting the offset of the entry point. */ | |
475 | load_addr = (regcache_read_pc (get_current_regcache ()) | |
192b62ce | 476 | - bfd_get_start_address (dyld_bfd.get ())); |
cf1061c0 TG |
477 | |
478 | /* Now try to set a breakpoint in the dynamic linker. */ | |
ec95993c | 479 | info->all_image_addr = |
192b62ce | 480 | lookup_symbol_from_bfd (dyld_bfd.get (), "_dyld_all_image_infos"); |
cf1061c0 | 481 | |
ec95993c | 482 | if (info->all_image_addr == 0) |
cf1061c0 TG |
483 | return; |
484 | ||
ec95993c | 485 | info->all_image_addr += load_addr; |
f00c55f8 TG |
486 | } |
487 | ||
ad2073b0 | 488 | /* Extract dyld_all_image_addr reading it from |
f00c55f8 TG |
489 | TARGET_OBJECT_DARWIN_DYLD_INFO. */ |
490 | ||
491 | static void | |
ec95993c | 492 | darwin_solib_read_all_image_info_addr (struct darwin_info *info) |
f00c55f8 | 493 | { |
ad2073b0 | 494 | gdb_byte buf[8]; |
f00c55f8 | 495 | LONGEST len; |
ad2073b0 TG |
496 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
497 | ||
498 | /* Sanity check. */ | |
132874d7 | 499 | if (TYPE_LENGTH (ptr_type) > sizeof (buf)) |
ad2073b0 | 500 | return; |
f00c55f8 | 501 | |
8b88a78e PA |
502 | len = target_read (current_top_target (), TARGET_OBJECT_DARWIN_DYLD_INFO, |
503 | NULL, buf, 0, TYPE_LENGTH (ptr_type)); | |
ad2073b0 | 504 | if (len <= 0) |
f00c55f8 TG |
505 | return; |
506 | ||
ad2073b0 TG |
507 | /* The use of BIG endian is intended, as BUF is a raw stream of bytes. This |
508 | makes the support of remote protocol easier. */ | |
509 | info->all_image_addr = extract_unsigned_integer (buf, len, BFD_ENDIAN_BIG); | |
f00c55f8 TG |
510 | } |
511 | ||
512 | /* Shared library startup support. See documentation in solib-svr4.c. */ | |
513 | ||
514 | static void | |
515 | darwin_solib_create_inferior_hook (int from_tty) | |
516 | { | |
ec95993c | 517 | struct darwin_info *info = get_darwin_info (); |
4141a416 | 518 | CORE_ADDR load_addr; |
ec95993c TG |
519 | |
520 | info->all_image_addr = 0; | |
f00c55f8 | 521 | |
ec95993c | 522 | darwin_solib_read_all_image_info_addr (info); |
f00c55f8 | 523 | |
ec95993c TG |
524 | if (info->all_image_addr == 0) |
525 | darwin_solib_get_all_image_info_addr_at_init (info); | |
f00c55f8 | 526 | |
ec95993c | 527 | if (info->all_image_addr == 0) |
f00c55f8 | 528 | return; |
cf1061c0 | 529 | |
ec95993c | 530 | darwin_load_image_infos (info); |
cf1061c0 | 531 | |
4141a416 | 532 | if (!darwin_dyld_version_ok (info)) |
d4ccb5e0 TG |
533 | { |
534 | warning (_("unhandled dyld version (%d)"), info->all_image.version); | |
535 | return; | |
536 | } | |
4141a416 | 537 | |
ad2073b0 TG |
538 | if (info->all_image.count != 0) |
539 | { | |
540 | /* Possible relocate the main executable (PIE). */ | |
541 | load_addr = darwin_read_exec_load_addr_from_dyld (info); | |
542 | } | |
543 | else | |
544 | { | |
545 | /* Possible issue: | |
546 | Do not break on the notifier if dyld is not initialized (deduced from | |
547 | count == 0). In that case, dyld hasn't relocated itself and the | |
548 | notifier may point to a wrong address. */ | |
549 | ||
550 | load_addr = darwin_read_exec_load_addr_at_init (info); | |
551 | } | |
552 | ||
4141a416 JB |
553 | if (load_addr != 0 && symfile_objfile != NULL) |
554 | { | |
1bdad2e0 | 555 | CORE_ADDR vmaddr; |
4141a416 JB |
556 | |
557 | /* Find the base address of the executable. */ | |
1bdad2e0 | 558 | vmaddr = bfd_mach_o_get_base_address (exec_bfd); |
4141a416 JB |
559 | |
560 | /* Relocate. */ | |
561 | if (vmaddr != load_addr) | |
562 | objfile_rebase (symfile_objfile, load_addr - vmaddr); | |
563 | } | |
79b32f4a XR |
564 | |
565 | /* Set solib notifier (to reload list of shared libraries). */ | |
566 | CORE_ADDR notifier = info->all_image.notifier; | |
567 | ||
568 | if (info->all_image.count == 0) | |
569 | { | |
570 | /* Dyld hasn't yet relocated itself, so the notifier address may | |
571 | be incorrect (as it has to be relocated). */ | |
572 | CORE_ADDR start = bfd_get_start_address (exec_bfd); | |
573 | if (start == 0) | |
574 | notifier = 0; | |
575 | else | |
576 | { | |
577 | gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd (); | |
578 | if (dyld_bfd != NULL) | |
579 | { | |
580 | CORE_ADDR dyld_bfd_start_address; | |
581 | CORE_ADDR dyld_relocated_base_address; | |
582 | CORE_ADDR pc; | |
583 | ||
584 | dyld_bfd_start_address = bfd_get_start_address (dyld_bfd.get()); | |
585 | ||
586 | /* We find the dynamic linker's base address by examining | |
587 | the current pc (which should point at the entry point | |
588 | for the dynamic linker) and subtracting the offset of | |
589 | the entry point. */ | |
590 | ||
591 | pc = regcache_read_pc (get_current_regcache ()); | |
592 | dyld_relocated_base_address = pc - dyld_bfd_start_address; | |
593 | ||
594 | /* We get the proper notifier relocated address by | |
595 | adding the dyld relocated base address to the current | |
596 | notifier offset value. */ | |
597 | ||
598 | notifier += dyld_relocated_base_address; | |
599 | } | |
600 | } | |
601 | } | |
602 | ||
603 | /* Add the breakpoint which is hit by dyld when the list of solib is | |
604 | modified. */ | |
605 | if (notifier != 0) | |
606 | create_solib_event_breakpoint (target_gdbarch (), notifier); | |
cf1061c0 TG |
607 | } |
608 | ||
609 | static void | |
610 | darwin_clear_solib (void) | |
611 | { | |
ec95993c TG |
612 | struct darwin_info *info = get_darwin_info (); |
613 | ||
614 | info->all_image_addr = 0; | |
615 | info->all_image.version = 0; | |
cf1061c0 TG |
616 | } |
617 | ||
618 | static void | |
619 | darwin_free_so (struct so_list *so) | |
620 | { | |
9ccbfd7b SM |
621 | lm_info_darwin *li = (lm_info_darwin *) so->lm_info; |
622 | ||
623 | delete li; | |
cf1061c0 TG |
624 | } |
625 | ||
626 | /* The section table is built from bfd sections using bfd VMAs. | |
627 | Relocate these VMAs according to solib info. */ | |
066d7383 | 628 | |
cf1061c0 TG |
629 | static void |
630 | darwin_relocate_section_addresses (struct so_list *so, | |
0542c86d | 631 | struct target_section *sec) |
cf1061c0 | 632 | { |
d0e449a1 SM |
633 | lm_info_darwin *li = (lm_info_darwin *) so->lm_info; |
634 | ||
635 | sec->addr += li->lm_addr; | |
636 | sec->endaddr += li->lm_addr; | |
cf1061c0 TG |
637 | |
638 | /* Best effort to set addr_high/addr_low. This is used only by | |
639 | 'info sharedlibary'. */ | |
640 | if (so->addr_high == 0) | |
641 | { | |
642 | so->addr_low = sec->addr; | |
643 | so->addr_high = sec->endaddr; | |
644 | } | |
645 | if (sec->endaddr > so->addr_high) | |
646 | so->addr_high = sec->endaddr; | |
647 | if (sec->addr < so->addr_low) | |
648 | so->addr_low = sec->addr; | |
649 | } | |
650 | \f | |
d12307c1 | 651 | static struct block_symbol |
efad9b6a | 652 | darwin_lookup_lib_symbol (struct objfile *objfile, |
cf1061c0 | 653 | const char *name, |
cf1061c0 TG |
654 | const domain_enum domain) |
655 | { | |
d12307c1 | 656 | return (struct block_symbol) {NULL, NULL}; |
cf1061c0 TG |
657 | } |
658 | ||
192b62ce | 659 | static gdb_bfd_ref_ptr |
692d6f97 | 660 | darwin_bfd_open (const char *pathname) |
cf1061c0 | 661 | { |
cf1061c0 | 662 | int found_file; |
cf1061c0 TG |
663 | |
664 | /* Search for shared library file. */ | |
797bc1cb TT |
665 | gdb::unique_xmalloc_ptr<char> found_pathname |
666 | = solib_find (pathname, &found_file); | |
cf1061c0 TG |
667 | if (found_pathname == NULL) |
668 | perror_with_name (pathname); | |
669 | ||
670 | /* Open bfd for shared library. */ | |
797bc1cb | 671 | gdb_bfd_ref_ptr abfd (solib_bfd_fopen (found_pathname.get (), found_file)); |
cf1061c0 | 672 | |
192b62ce TT |
673 | gdb_bfd_ref_ptr res |
674 | (gdb_bfd_mach_o_fat_extract (abfd.get (), bfd_object, | |
675 | gdbarch_bfd_arch_info (target_gdbarch ()))); | |
676 | if (res == NULL) | |
677 | error (_("`%s': not a shared-library: %s"), | |
678 | bfd_get_filename (abfd.get ()), bfd_errmsg (bfd_get_error ())); | |
0cd61f44 | 679 | |
b030cf11 JB |
680 | /* The current filename for fat-binary BFDs is a name generated |
681 | by BFD, usually a string containing the name of the architecture. | |
682 | Reset its value to the actual filename. */ | |
192b62ce | 683 | xfree (bfd_get_filename (res.get ())); |
adcf2eed | 684 | res->filename = xstrdup (pathname); |
b030cf11 | 685 | |
cf1061c0 TG |
686 | return res; |
687 | } | |
688 | ||
689 | struct target_so_ops darwin_so_ops; | |
690 | ||
691 | void | |
692 | _initialize_darwin_solib (void) | |
693 | { | |
ec95993c | 694 | solib_darwin_pspace_data |
8e260fc0 TT |
695 | = register_program_space_data_with_cleanup (NULL, |
696 | darwin_pspace_data_cleanup); | |
ec95993c | 697 | |
cf1061c0 TG |
698 | darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses; |
699 | darwin_so_ops.free_so = darwin_free_so; | |
700 | darwin_so_ops.clear_solib = darwin_clear_solib; | |
701 | darwin_so_ops.solib_create_inferior_hook = darwin_solib_create_inferior_hook; | |
cf1061c0 TG |
702 | darwin_so_ops.current_sos = darwin_current_sos; |
703 | darwin_so_ops.open_symbol_file_object = open_symbol_file_object; | |
704 | darwin_so_ops.in_dynsym_resolve_code = darwin_in_dynsym_resolve_code; | |
705 | darwin_so_ops.lookup_lib_global_symbol = darwin_lookup_lib_symbol; | |
706 | darwin_so_ops.bfd_open = darwin_bfd_open; | |
707 | } |