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cf1061c0 TG |
1 | /* Handle Darwin shared libraries for GDB, the GNU Debugger. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2009-2020 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. */ | |
51df2ae3 | 76 | CORE_ADDR all_image_addr = 0; |
ec95993c TG |
77 | |
78 | /* Gdb copy of dyld_all_info_infos. */ | |
51df2ae3 | 79 | struct gdb_dyld_all_image_infos all_image {}; |
ec95993c TG |
80 | }; |
81 | ||
82 | /* Per-program-space data key. */ | |
51df2ae3 | 83 | static program_space_key<darwin_info> solib_darwin_pspace_data; |
cf1061c0 | 84 | |
ec95993c TG |
85 | /* Get the current darwin data. If none is found yet, add it now. This |
86 | function always returns a valid object. */ | |
87 | ||
88 | static struct darwin_info * | |
89 | get_darwin_info (void) | |
90 | { | |
91 | struct darwin_info *info; | |
92 | ||
51df2ae3 | 93 | info = solib_darwin_pspace_data.get (current_program_space); |
ec95993c TG |
94 | if (info != NULL) |
95 | return info; | |
96 | ||
51df2ae3 | 97 | return solib_darwin_pspace_data.emplace (current_program_space); |
ec95993c | 98 | } |
cf1061c0 | 99 | |
066d7383 TG |
100 | /* Return non-zero if the version in dyld_all_image is known. */ |
101 | ||
102 | static int | |
ec95993c | 103 | darwin_dyld_version_ok (const struct darwin_info *info) |
066d7383 | 104 | { |
ec95993c TG |
105 | return info->all_image.version >= DYLD_VERSION_MIN |
106 | && info->all_image.version <= DYLD_VERSION_MAX; | |
066d7383 TG |
107 | } |
108 | ||
cf1061c0 | 109 | /* Read dyld_all_image from inferior. */ |
066d7383 | 110 | |
cf1061c0 | 111 | static void |
ec95993c | 112 | darwin_load_image_infos (struct darwin_info *info) |
cf1061c0 TG |
113 | { |
114 | gdb_byte buf[24]; | |
f5656ead TT |
115 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
116 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
cf1061c0 TG |
117 | int len; |
118 | ||
119 | /* If the structure address is not known, don't continue. */ | |
ec95993c | 120 | if (info->all_image_addr == 0) |
cf1061c0 TG |
121 | return; |
122 | ||
123 | /* The structure has 4 fields: version (4 bytes), count (4 bytes), | |
124 | info (pointer) and notifier (pointer). */ | |
132874d7 | 125 | len = 4 + 4 + 2 * TYPE_LENGTH (ptr_type); |
cf1061c0 | 126 | gdb_assert (len <= sizeof (buf)); |
ec95993c | 127 | memset (&info->all_image, 0, sizeof (info->all_image)); |
cf1061c0 TG |
128 | |
129 | /* Read structure raw bytes from target. */ | |
ec95993c | 130 | if (target_read_memory (info->all_image_addr, buf, len)) |
cf1061c0 TG |
131 | return; |
132 | ||
133 | /* Extract the fields. */ | |
ec95993c TG |
134 | info->all_image.version = extract_unsigned_integer (buf, 4, byte_order); |
135 | if (!darwin_dyld_version_ok (info)) | |
cf1061c0 TG |
136 | return; |
137 | ||
ec95993c TG |
138 | info->all_image.count = extract_unsigned_integer (buf + 4, 4, byte_order); |
139 | info->all_image.info = extract_typed_address (buf + 8, ptr_type); | |
140 | info->all_image.notifier = extract_typed_address | |
132874d7 | 141 | (buf + 8 + TYPE_LENGTH (ptr_type), ptr_type); |
cf1061c0 TG |
142 | } |
143 | ||
144 | /* Link map info to include in an allocated so_list entry. */ | |
145 | ||
d0e449a1 | 146 | struct lm_info_darwin : public lm_info_base |
cf1061c0 TG |
147 | { |
148 | /* The target location of lm. */ | |
9ccbfd7b | 149 | CORE_ADDR lm_addr = 0; |
cf1061c0 TG |
150 | }; |
151 | ||
cf1061c0 | 152 | /* Lookup the value for a specific symbol. */ |
066d7383 | 153 | |
cf1061c0 | 154 | static CORE_ADDR |
a121b7c1 | 155 | lookup_symbol_from_bfd (bfd *abfd, const char *symname) |
cf1061c0 TG |
156 | { |
157 | long storage_needed; | |
158 | asymbol **symbol_table; | |
159 | unsigned int number_of_symbols; | |
160 | unsigned int i; | |
161 | CORE_ADDR symaddr = 0; | |
162 | ||
163 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
164 | ||
165 | if (storage_needed <= 0) | |
166 | return 0; | |
167 | ||
168 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
169 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
70d4c673 | 170 | |
cf1061c0 TG |
171 | for (i = 0; i < number_of_symbols; i++) |
172 | { | |
173 | asymbol *sym = symbol_table[i]; | |
433759f7 | 174 | |
cf1061c0 TG |
175 | if (strcmp (sym->name, symname) == 0 |
176 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) | |
177 | { | |
178 | /* BFD symbols are section relative. */ | |
179 | symaddr = sym->value + sym->section->vma; | |
180 | break; | |
181 | } | |
182 | } | |
183 | xfree (symbol_table); | |
184 | ||
185 | return symaddr; | |
186 | } | |
187 | ||
188 | /* Return program interpreter string. */ | |
023e4e81 | 189 | |
001f13d8 | 190 | static char * |
cf1061c0 TG |
191 | find_program_interpreter (void) |
192 | { | |
001f13d8 | 193 | char *buf = NULL; |
cf1061c0 | 194 | |
023e4e81 | 195 | /* If we have an exec_bfd, get the interpreter from the load commands. */ |
cf1061c0 TG |
196 | if (exec_bfd) |
197 | { | |
023e4e81 | 198 | bfd_mach_o_load_command *cmd; |
70d4c673 | 199 | |
023e4e81 TG |
200 | if (bfd_mach_o_lookup_command (exec_bfd, |
201 | BFD_MACH_O_LC_LOAD_DYLINKER, &cmd) == 1) | |
202 | return cmd->command.dylinker.name_str; | |
cf1061c0 TG |
203 | } |
204 | ||
205 | /* If we didn't find it, read from memory. | |
206 | FIXME: todo. */ | |
207 | return buf; | |
208 | } | |
209 | ||
210 | /* Not used. I don't see how the main symbol file can be found: the | |
211 | interpreter name is needed and it is known from the executable file. | |
212 | Note that darwin-nat.c implements pid_to_exec_file. */ | |
066d7383 | 213 | |
cf1061c0 | 214 | static int |
bf469271 | 215 | open_symbol_file_object (int from_tty) |
cf1061c0 TG |
216 | { |
217 | return 0; | |
218 | } | |
219 | ||
c378eb4e | 220 | /* Build a list of currently loaded shared objects. See solib-svr4.c. */ |
066d7383 | 221 | |
cf1061c0 TG |
222 | static struct so_list * |
223 | darwin_current_sos (void) | |
224 | { | |
f5656ead | 225 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
34877895 | 226 | enum bfd_endian byte_order = type_byte_order (ptr_type); |
cf1061c0 TG |
227 | int ptr_len = TYPE_LENGTH (ptr_type); |
228 | unsigned int image_info_size; | |
cf1061c0 TG |
229 | struct so_list *head = NULL; |
230 | struct so_list *tail = NULL; | |
231 | int i; | |
ec95993c | 232 | struct darwin_info *info = get_darwin_info (); |
cf1061c0 TG |
233 | |
234 | /* Be sure image infos are loaded. */ | |
ec95993c | 235 | darwin_load_image_infos (info); |
cf1061c0 | 236 | |
ec95993c | 237 | if (!darwin_dyld_version_ok (info)) |
cf1061c0 TG |
238 | return NULL; |
239 | ||
240 | image_info_size = ptr_len * 3; | |
241 | ||
242 | /* Read infos for each solib. | |
8544a150 TG |
243 | The first entry was rumored to be the executable itself, but this is not |
244 | true when a large number of shared libraries are used (table expanded ?). | |
245 | We now check all entries, but discard executable images. */ | |
ec95993c | 246 | for (i = 0; i < info->all_image.count; i++) |
cf1061c0 | 247 | { |
ec95993c | 248 | CORE_ADDR iinfo = info->all_image.info + i * image_info_size; |
e362b510 | 249 | gdb_byte buf[image_info_size]; |
cf1061c0 TG |
250 | CORE_ADDR load_addr; |
251 | CORE_ADDR path_addr; | |
8544a150 TG |
252 | struct mach_o_header_external hdr; |
253 | unsigned long hdr_val; | |
cf1061c0 TG |
254 | |
255 | /* Read image info from inferior. */ | |
ec95993c | 256 | if (target_read_memory (iinfo, buf, image_info_size)) |
cf1061c0 TG |
257 | break; |
258 | ||
259 | load_addr = extract_typed_address (buf, ptr_type); | |
260 | path_addr = extract_typed_address (buf + ptr_len, ptr_type); | |
261 | ||
8544a150 | 262 | /* Read Mach-O header from memory. */ |
948f8e3d | 263 | if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4)) |
8544a150 TG |
264 | break; |
265 | /* Discard wrong magic numbers. Shouldn't happen. */ | |
266 | hdr_val = extract_unsigned_integer | |
267 | (hdr.magic, sizeof (hdr.magic), byte_order); | |
268 | if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64) | |
269 | continue; | |
270 | /* Discard executable. Should happen only once. */ | |
271 | hdr_val = extract_unsigned_integer | |
272 | (hdr.filetype, sizeof (hdr.filetype), byte_order); | |
273 | if (hdr_val == BFD_MACH_O_MH_EXECUTE) | |
274 | continue; | |
275 | ||
66920317 TT |
276 | gdb::unique_xmalloc_ptr<char> file_path |
277 | = target_read_string (path_addr, SO_NAME_MAX_PATH_SIZE - 1); | |
278 | if (file_path == nullptr) | |
cf1061c0 TG |
279 | break; |
280 | ||
281 | /* Create and fill the new so_list element. */ | |
668eb2f0 | 282 | gdb::unique_xmalloc_ptr<struct so_list> newobj (XCNEW (struct so_list)); |
cf1061c0 | 283 | |
9ccbfd7b | 284 | lm_info_darwin *li = new lm_info_darwin; |
d0e449a1 | 285 | newobj->lm_info = li; |
cf1061c0 | 286 | |
e83e4e24 | 287 | strncpy (newobj->so_name, file_path.get (), SO_NAME_MAX_PATH_SIZE - 1); |
fe978cb0 PA |
288 | newobj->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
289 | strcpy (newobj->so_original_name, newobj->so_name); | |
d0e449a1 | 290 | li->lm_addr = load_addr; |
cf1061c0 TG |
291 | |
292 | if (head == NULL) | |
668eb2f0 | 293 | head = newobj.get (); |
cf1061c0 | 294 | else |
668eb2f0 TT |
295 | tail->next = newobj.get (); |
296 | tail = newobj.release (); | |
cf1061c0 TG |
297 | } |
298 | ||
299 | return head; | |
300 | } | |
301 | ||
ad2073b0 TG |
302 | /* Check LOAD_ADDR points to a Mach-O executable header. Return LOAD_ADDR |
303 | in case of success, 0 in case of failure. */ | |
4141a416 JB |
304 | |
305 | static CORE_ADDR | |
ad2073b0 TG |
306 | darwin_validate_exec_header (CORE_ADDR load_addr) |
307 | { | |
308 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
309 | struct mach_o_header_external hdr; | |
310 | unsigned long hdr_val; | |
311 | ||
312 | /* Read Mach-O header from memory. */ | |
313 | if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4)) | |
314 | return 0; | |
315 | ||
316 | /* Discard wrong magic numbers. Shouldn't happen. */ | |
317 | hdr_val = extract_unsigned_integer | |
318 | (hdr.magic, sizeof (hdr.magic), byte_order); | |
319 | if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64) | |
320 | return 0; | |
321 | ||
322 | /* Check executable. */ | |
323 | hdr_val = extract_unsigned_integer | |
324 | (hdr.filetype, sizeof (hdr.filetype), byte_order); | |
325 | if (hdr_val == BFD_MACH_O_MH_EXECUTE) | |
326 | return load_addr; | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | /* Get the load address of the executable using dyld list of images. | |
332 | We assume that the dyld info are correct (which is wrong if the target | |
333 | is stopped at the first instruction). */ | |
334 | ||
335 | static CORE_ADDR | |
336 | darwin_read_exec_load_addr_from_dyld (struct darwin_info *info) | |
4141a416 JB |
337 | { |
338 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
4141a416 JB |
339 | int ptr_len = TYPE_LENGTH (ptr_type); |
340 | unsigned int image_info_size = ptr_len * 3; | |
341 | int i; | |
342 | ||
343 | /* Read infos for each solib. One of them should be the executable. */ | |
344 | for (i = 0; i < info->all_image.count; i++) | |
345 | { | |
346 | CORE_ADDR iinfo = info->all_image.info + i * image_info_size; | |
e362b510 | 347 | gdb_byte buf[image_info_size]; |
4141a416 | 348 | CORE_ADDR load_addr; |
4141a416 JB |
349 | |
350 | /* Read image info from inferior. */ | |
351 | if (target_read_memory (iinfo, buf, image_info_size)) | |
352 | break; | |
353 | ||
354 | load_addr = extract_typed_address (buf, ptr_type); | |
ad2073b0 | 355 | if (darwin_validate_exec_header (load_addr) == load_addr) |
4141a416 JB |
356 | return load_addr; |
357 | } | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
ad2073b0 TG |
362 | /* Get the load address of the executable when the PC is at the dyld |
363 | entry point using parameter passed by the kernel (at SP). */ | |
364 | ||
365 | static CORE_ADDR | |
366 | darwin_read_exec_load_addr_at_init (struct darwin_info *info) | |
367 | { | |
368 | struct gdbarch *gdbarch = target_gdbarch (); | |
369 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
370 | int addr_size = gdbarch_addr_bit (gdbarch) / 8; | |
371 | ULONGEST load_ptr_addr; | |
372 | ULONGEST load_addr; | |
373 | gdb_byte buf[8]; | |
374 | ||
375 | /* Get SP. */ | |
376 | if (regcache_cooked_read_unsigned (get_current_regcache (), | |
377 | gdbarch_sp_regnum (gdbarch), | |
378 | &load_ptr_addr) != REG_VALID) | |
379 | return 0; | |
380 | ||
381 | /* Read value at SP (image load address). */ | |
382 | if (target_read_memory (load_ptr_addr, buf, addr_size)) | |
383 | return 0; | |
384 | ||
385 | load_addr = extract_unsigned_integer (buf, addr_size, byte_order); | |
386 | ||
387 | return darwin_validate_exec_header (load_addr); | |
388 | } | |
389 | ||
cf1061c0 TG |
390 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
391 | run time loader. */ | |
066d7383 | 392 | |
693be288 | 393 | static int |
cf1061c0 TG |
394 | darwin_in_dynsym_resolve_code (CORE_ADDR pc) |
395 | { | |
396 | return 0; | |
397 | } | |
398 | ||
0cd61f44 TT |
399 | /* A wrapper for bfd_mach_o_fat_extract that handles reference |
400 | counting properly. This will either return NULL, or return a new | |
401 | reference to a BFD. */ | |
402 | ||
192b62ce | 403 | static gdb_bfd_ref_ptr |
0cd61f44 TT |
404 | gdb_bfd_mach_o_fat_extract (bfd *abfd, bfd_format format, |
405 | const bfd_arch_info_type *arch) | |
406 | { | |
407 | bfd *result = bfd_mach_o_fat_extract (abfd, format, arch); | |
408 | ||
409 | if (result == NULL) | |
410 | return NULL; | |
411 | ||
412 | if (result == abfd) | |
413 | gdb_bfd_ref (result); | |
414 | else | |
415 | gdb_bfd_mark_parent (result, abfd); | |
416 | ||
192b62ce | 417 | return gdb_bfd_ref_ptr (result); |
0cd61f44 TT |
418 | } |
419 | ||
79b32f4a | 420 | /* Return the BFD for the program interpreter. */ |
066d7383 | 421 | |
79b32f4a XR |
422 | static gdb_bfd_ref_ptr |
423 | darwin_get_dyld_bfd () | |
cf1061c0 | 424 | { |
001f13d8 | 425 | char *interp_name; |
f00c55f8 TG |
426 | |
427 | /* This method doesn't work with an attached process. */ | |
428 | if (current_inferior ()->attach_flag) | |
79b32f4a | 429 | return NULL; |
cf1061c0 | 430 | |
cf1061c0 TG |
431 | /* Find the program interpreter. */ |
432 | interp_name = find_program_interpreter (); | |
433 | if (!interp_name) | |
79b32f4a | 434 | return NULL; |
cf1061c0 TG |
435 | |
436 | /* Create a bfd for the interpreter. */ | |
ad80db5b | 437 | gdb_bfd_ref_ptr dyld_bfd (gdb_bfd_open (interp_name, gnutarget)); |
192b62ce | 438 | if (dyld_bfd != NULL) |
cf1061c0 | 439 | { |
192b62ce TT |
440 | gdb_bfd_ref_ptr sub |
441 | (gdb_bfd_mach_o_fat_extract (dyld_bfd.get (), bfd_object, | |
442 | gdbarch_bfd_arch_info (target_gdbarch ()))); | |
cd5a152c | 443 | dyld_bfd = sub; |
d6ad71ba | 444 | } |
79b32f4a XR |
445 | return dyld_bfd; |
446 | } | |
447 | ||
448 | /* Extract dyld_all_image_addr when the process was just created, assuming the | |
449 | current PC is at the entry of the dynamic linker. */ | |
450 | ||
451 | static void | |
452 | darwin_solib_get_all_image_info_addr_at_init (struct darwin_info *info) | |
453 | { | |
454 | CORE_ADDR load_addr = 0; | |
455 | gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd (); | |
456 | ||
192b62ce TT |
457 | if (dyld_bfd == NULL) |
458 | return; | |
70d4c673 | 459 | |
f00c55f8 TG |
460 | /* We find the dynamic linker's base address by examining |
461 | the current pc (which should point at the entry point for the | |
462 | dynamic linker) and subtracting the offset of the entry point. */ | |
463 | load_addr = (regcache_read_pc (get_current_regcache ()) | |
192b62ce | 464 | - bfd_get_start_address (dyld_bfd.get ())); |
cf1061c0 TG |
465 | |
466 | /* Now try to set a breakpoint in the dynamic linker. */ | |
ec95993c | 467 | info->all_image_addr = |
192b62ce | 468 | lookup_symbol_from_bfd (dyld_bfd.get (), "_dyld_all_image_infos"); |
cf1061c0 | 469 | |
ec95993c | 470 | if (info->all_image_addr == 0) |
cf1061c0 TG |
471 | return; |
472 | ||
ec95993c | 473 | info->all_image_addr += load_addr; |
f00c55f8 TG |
474 | } |
475 | ||
ad2073b0 | 476 | /* Extract dyld_all_image_addr reading it from |
f00c55f8 TG |
477 | TARGET_OBJECT_DARWIN_DYLD_INFO. */ |
478 | ||
479 | static void | |
ec95993c | 480 | darwin_solib_read_all_image_info_addr (struct darwin_info *info) |
f00c55f8 | 481 | { |
ad2073b0 | 482 | gdb_byte buf[8]; |
f00c55f8 | 483 | LONGEST len; |
ad2073b0 TG |
484 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
485 | ||
486 | /* Sanity check. */ | |
132874d7 | 487 | if (TYPE_LENGTH (ptr_type) > sizeof (buf)) |
ad2073b0 | 488 | return; |
f00c55f8 | 489 | |
8b88a78e PA |
490 | len = target_read (current_top_target (), TARGET_OBJECT_DARWIN_DYLD_INFO, |
491 | NULL, buf, 0, TYPE_LENGTH (ptr_type)); | |
ad2073b0 | 492 | if (len <= 0) |
f00c55f8 TG |
493 | return; |
494 | ||
ad2073b0 TG |
495 | /* The use of BIG endian is intended, as BUF is a raw stream of bytes. This |
496 | makes the support of remote protocol easier. */ | |
497 | info->all_image_addr = extract_unsigned_integer (buf, len, BFD_ENDIAN_BIG); | |
f00c55f8 TG |
498 | } |
499 | ||
500 | /* Shared library startup support. See documentation in solib-svr4.c. */ | |
501 | ||
502 | static void | |
503 | darwin_solib_create_inferior_hook (int from_tty) | |
504 | { | |
ec95993c | 505 | struct darwin_info *info = get_darwin_info (); |
4141a416 | 506 | CORE_ADDR load_addr; |
ec95993c TG |
507 | |
508 | info->all_image_addr = 0; | |
f00c55f8 | 509 | |
ec95993c | 510 | darwin_solib_read_all_image_info_addr (info); |
f00c55f8 | 511 | |
ec95993c TG |
512 | if (info->all_image_addr == 0) |
513 | darwin_solib_get_all_image_info_addr_at_init (info); | |
f00c55f8 | 514 | |
ec95993c | 515 | if (info->all_image_addr == 0) |
f00c55f8 | 516 | return; |
cf1061c0 | 517 | |
ec95993c | 518 | darwin_load_image_infos (info); |
cf1061c0 | 519 | |
4141a416 | 520 | if (!darwin_dyld_version_ok (info)) |
d4ccb5e0 TG |
521 | { |
522 | warning (_("unhandled dyld version (%d)"), info->all_image.version); | |
523 | return; | |
524 | } | |
4141a416 | 525 | |
ad2073b0 TG |
526 | if (info->all_image.count != 0) |
527 | { | |
528 | /* Possible relocate the main executable (PIE). */ | |
529 | load_addr = darwin_read_exec_load_addr_from_dyld (info); | |
530 | } | |
531 | else | |
532 | { | |
533 | /* Possible issue: | |
534 | Do not break on the notifier if dyld is not initialized (deduced from | |
535 | count == 0). In that case, dyld hasn't relocated itself and the | |
536 | notifier may point to a wrong address. */ | |
537 | ||
538 | load_addr = darwin_read_exec_load_addr_at_init (info); | |
539 | } | |
540 | ||
4141a416 JB |
541 | if (load_addr != 0 && symfile_objfile != NULL) |
542 | { | |
1bdad2e0 | 543 | CORE_ADDR vmaddr; |
4141a416 JB |
544 | |
545 | /* Find the base address of the executable. */ | |
1bdad2e0 | 546 | vmaddr = bfd_mach_o_get_base_address (exec_bfd); |
4141a416 JB |
547 | |
548 | /* Relocate. */ | |
549 | if (vmaddr != load_addr) | |
550 | objfile_rebase (symfile_objfile, load_addr - vmaddr); | |
551 | } | |
79b32f4a XR |
552 | |
553 | /* Set solib notifier (to reload list of shared libraries). */ | |
554 | CORE_ADDR notifier = info->all_image.notifier; | |
555 | ||
556 | if (info->all_image.count == 0) | |
557 | { | |
558 | /* Dyld hasn't yet relocated itself, so the notifier address may | |
559 | be incorrect (as it has to be relocated). */ | |
560 | CORE_ADDR start = bfd_get_start_address (exec_bfd); | |
561 | if (start == 0) | |
562 | notifier = 0; | |
563 | else | |
564 | { | |
565 | gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd (); | |
566 | if (dyld_bfd != NULL) | |
567 | { | |
568 | CORE_ADDR dyld_bfd_start_address; | |
569 | CORE_ADDR dyld_relocated_base_address; | |
570 | CORE_ADDR pc; | |
571 | ||
572 | dyld_bfd_start_address = bfd_get_start_address (dyld_bfd.get()); | |
573 | ||
574 | /* We find the dynamic linker's base address by examining | |
575 | the current pc (which should point at the entry point | |
576 | for the dynamic linker) and subtracting the offset of | |
577 | the entry point. */ | |
578 | ||
579 | pc = regcache_read_pc (get_current_regcache ()); | |
580 | dyld_relocated_base_address = pc - dyld_bfd_start_address; | |
581 | ||
582 | /* We get the proper notifier relocated address by | |
583 | adding the dyld relocated base address to the current | |
584 | notifier offset value. */ | |
585 | ||
586 | notifier += dyld_relocated_base_address; | |
587 | } | |
588 | } | |
589 | } | |
590 | ||
591 | /* Add the breakpoint which is hit by dyld when the list of solib is | |
592 | modified. */ | |
593 | if (notifier != 0) | |
594 | create_solib_event_breakpoint (target_gdbarch (), notifier); | |
cf1061c0 TG |
595 | } |
596 | ||
597 | static void | |
598 | darwin_clear_solib (void) | |
599 | { | |
ec95993c TG |
600 | struct darwin_info *info = get_darwin_info (); |
601 | ||
602 | info->all_image_addr = 0; | |
603 | info->all_image.version = 0; | |
cf1061c0 TG |
604 | } |
605 | ||
606 | static void | |
607 | darwin_free_so (struct so_list *so) | |
608 | { | |
9ccbfd7b SM |
609 | lm_info_darwin *li = (lm_info_darwin *) so->lm_info; |
610 | ||
611 | delete li; | |
cf1061c0 TG |
612 | } |
613 | ||
614 | /* The section table is built from bfd sections using bfd VMAs. | |
615 | Relocate these VMAs according to solib info. */ | |
066d7383 | 616 | |
cf1061c0 TG |
617 | static void |
618 | darwin_relocate_section_addresses (struct so_list *so, | |
0542c86d | 619 | struct target_section *sec) |
cf1061c0 | 620 | { |
d0e449a1 SM |
621 | lm_info_darwin *li = (lm_info_darwin *) so->lm_info; |
622 | ||
623 | sec->addr += li->lm_addr; | |
624 | sec->endaddr += li->lm_addr; | |
cf1061c0 TG |
625 | |
626 | /* Best effort to set addr_high/addr_low. This is used only by | |
627 | 'info sharedlibary'. */ | |
628 | if (so->addr_high == 0) | |
629 | { | |
630 | so->addr_low = sec->addr; | |
631 | so->addr_high = sec->endaddr; | |
632 | } | |
633 | if (sec->endaddr > so->addr_high) | |
634 | so->addr_high = sec->endaddr; | |
635 | if (sec->addr < so->addr_low) | |
636 | so->addr_low = sec->addr; | |
637 | } | |
638 | \f | |
192b62ce | 639 | static gdb_bfd_ref_ptr |
692d6f97 | 640 | darwin_bfd_open (const char *pathname) |
cf1061c0 | 641 | { |
cf1061c0 | 642 | int found_file; |
cf1061c0 TG |
643 | |
644 | /* Search for shared library file. */ | |
797bc1cb TT |
645 | gdb::unique_xmalloc_ptr<char> found_pathname |
646 | = solib_find (pathname, &found_file); | |
cf1061c0 TG |
647 | if (found_pathname == NULL) |
648 | perror_with_name (pathname); | |
649 | ||
650 | /* Open bfd for shared library. */ | |
797bc1cb | 651 | gdb_bfd_ref_ptr abfd (solib_bfd_fopen (found_pathname.get (), found_file)); |
cf1061c0 | 652 | |
192b62ce TT |
653 | gdb_bfd_ref_ptr res |
654 | (gdb_bfd_mach_o_fat_extract (abfd.get (), bfd_object, | |
655 | gdbarch_bfd_arch_info (target_gdbarch ()))); | |
656 | if (res == NULL) | |
657 | error (_("`%s': not a shared-library: %s"), | |
658 | bfd_get_filename (abfd.get ()), bfd_errmsg (bfd_get_error ())); | |
0cd61f44 | 659 | |
b030cf11 JB |
660 | /* The current filename for fat-binary BFDs is a name generated |
661 | by BFD, usually a string containing the name of the architecture. | |
662 | Reset its value to the actual filename. */ | |
7b958a48 | 663 | bfd_set_filename (res.get (), pathname); |
b030cf11 | 664 | |
cf1061c0 TG |
665 | return res; |
666 | } | |
667 | ||
668 | struct target_so_ops darwin_so_ops; | |
669 | ||
6c265988 | 670 | void _initialize_darwin_solib (); |
cf1061c0 | 671 | void |
6c265988 | 672 | _initialize_darwin_solib () |
cf1061c0 TG |
673 | { |
674 | darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses; | |
675 | darwin_so_ops.free_so = darwin_free_so; | |
676 | darwin_so_ops.clear_solib = darwin_clear_solib; | |
677 | darwin_so_ops.solib_create_inferior_hook = darwin_solib_create_inferior_hook; | |
cf1061c0 TG |
678 | darwin_so_ops.current_sos = darwin_current_sos; |
679 | darwin_so_ops.open_symbol_file_object = open_symbol_file_object; | |
680 | darwin_so_ops.in_dynsym_resolve_code = darwin_in_dynsym_resolve_code; | |
cf1061c0 TG |
681 | darwin_so_ops.bfd_open = darwin_bfd_open; |
682 | } |