Commit | Line | Data |
---|---|---|
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 | |
7e10abd1 TT |
195 | /* If we have an current exec_bfd, get the interpreter from the load |
196 | commands. */ | |
197 | if (current_program_space->exec_bfd ()) | |
cf1061c0 | 198 | { |
023e4e81 | 199 | bfd_mach_o_load_command *cmd; |
70d4c673 | 200 | |
7e10abd1 | 201 | if (bfd_mach_o_lookup_command (current_program_space->exec_bfd (), |
dda83cd7 SM |
202 | BFD_MACH_O_LC_LOAD_DYLINKER, &cmd) == 1) |
203 | return cmd->command.dylinker.name_str; | |
cf1061c0 TG |
204 | } |
205 | ||
206 | /* If we didn't find it, read from memory. | |
207 | FIXME: todo. */ | |
208 | return buf; | |
209 | } | |
210 | ||
211 | /* Not used. I don't see how the main symbol file can be found: the | |
212 | interpreter name is needed and it is known from the executable file. | |
213 | Note that darwin-nat.c implements pid_to_exec_file. */ | |
066d7383 | 214 | |
cf1061c0 | 215 | static int |
bf469271 | 216 | open_symbol_file_object (int from_tty) |
cf1061c0 TG |
217 | { |
218 | return 0; | |
219 | } | |
220 | ||
c378eb4e | 221 | /* Build a list of currently loaded shared objects. See solib-svr4.c. */ |
066d7383 | 222 | |
cf1061c0 TG |
223 | static struct so_list * |
224 | darwin_current_sos (void) | |
225 | { | |
f5656ead | 226 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
34877895 | 227 | enum bfd_endian byte_order = type_byte_order (ptr_type); |
cf1061c0 TG |
228 | int ptr_len = TYPE_LENGTH (ptr_type); |
229 | unsigned int image_info_size; | |
cf1061c0 TG |
230 | struct so_list *head = NULL; |
231 | struct so_list *tail = NULL; | |
232 | int i; | |
ec95993c | 233 | struct darwin_info *info = get_darwin_info (); |
cf1061c0 TG |
234 | |
235 | /* Be sure image infos are loaded. */ | |
ec95993c | 236 | darwin_load_image_infos (info); |
cf1061c0 | 237 | |
ec95993c | 238 | if (!darwin_dyld_version_ok (info)) |
cf1061c0 TG |
239 | return NULL; |
240 | ||
241 | image_info_size = ptr_len * 3; | |
242 | ||
243 | /* Read infos for each solib. | |
8544a150 TG |
244 | The first entry was rumored to be the executable itself, but this is not |
245 | true when a large number of shared libraries are used (table expanded ?). | |
246 | We now check all entries, but discard executable images. */ | |
ec95993c | 247 | for (i = 0; i < info->all_image.count; i++) |
cf1061c0 | 248 | { |
ec95993c | 249 | CORE_ADDR iinfo = info->all_image.info + i * image_info_size; |
e362b510 | 250 | gdb_byte buf[image_info_size]; |
cf1061c0 TG |
251 | CORE_ADDR load_addr; |
252 | CORE_ADDR path_addr; | |
8544a150 TG |
253 | struct mach_o_header_external hdr; |
254 | unsigned long hdr_val; | |
cf1061c0 TG |
255 | |
256 | /* Read image info from inferior. */ | |
ec95993c | 257 | if (target_read_memory (iinfo, buf, image_info_size)) |
cf1061c0 TG |
258 | break; |
259 | ||
260 | load_addr = extract_typed_address (buf, ptr_type); | |
261 | path_addr = extract_typed_address (buf + ptr_len, ptr_type); | |
262 | ||
8544a150 | 263 | /* Read Mach-O header from memory. */ |
948f8e3d | 264 | if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4)) |
8544a150 TG |
265 | break; |
266 | /* Discard wrong magic numbers. Shouldn't happen. */ | |
267 | hdr_val = extract_unsigned_integer | |
dda83cd7 | 268 | (hdr.magic, sizeof (hdr.magic), byte_order); |
8544a150 | 269 | if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64) |
dda83cd7 | 270 | continue; |
8544a150 TG |
271 | /* Discard executable. Should happen only once. */ |
272 | hdr_val = extract_unsigned_integer | |
dda83cd7 | 273 | (hdr.filetype, sizeof (hdr.filetype), byte_order); |
8544a150 | 274 | if (hdr_val == BFD_MACH_O_MH_EXECUTE) |
dda83cd7 | 275 | continue; |
8544a150 | 276 | |
66920317 TT |
277 | gdb::unique_xmalloc_ptr<char> file_path |
278 | = target_read_string (path_addr, SO_NAME_MAX_PATH_SIZE - 1); | |
279 | if (file_path == nullptr) | |
cf1061c0 TG |
280 | break; |
281 | ||
282 | /* Create and fill the new so_list element. */ | |
668eb2f0 | 283 | gdb::unique_xmalloc_ptr<struct so_list> newobj (XCNEW (struct so_list)); |
cf1061c0 | 284 | |
9ccbfd7b | 285 | lm_info_darwin *li = new lm_info_darwin; |
d0e449a1 | 286 | newobj->lm_info = li; |
cf1061c0 | 287 | |
e83e4e24 | 288 | strncpy (newobj->so_name, file_path.get (), SO_NAME_MAX_PATH_SIZE - 1); |
fe978cb0 PA |
289 | newobj->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
290 | strcpy (newobj->so_original_name, newobj->so_name); | |
d0e449a1 | 291 | li->lm_addr = load_addr; |
cf1061c0 TG |
292 | |
293 | if (head == NULL) | |
668eb2f0 | 294 | head = newobj.get (); |
cf1061c0 | 295 | else |
668eb2f0 TT |
296 | tail->next = newobj.get (); |
297 | tail = newobj.release (); | |
cf1061c0 TG |
298 | } |
299 | ||
300 | return head; | |
301 | } | |
302 | ||
ad2073b0 TG |
303 | /* Check LOAD_ADDR points to a Mach-O executable header. Return LOAD_ADDR |
304 | in case of success, 0 in case of failure. */ | |
4141a416 JB |
305 | |
306 | static CORE_ADDR | |
ad2073b0 TG |
307 | darwin_validate_exec_header (CORE_ADDR load_addr) |
308 | { | |
309 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
310 | struct mach_o_header_external hdr; | |
311 | unsigned long hdr_val; | |
312 | ||
313 | /* Read Mach-O header from memory. */ | |
314 | if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4)) | |
315 | return 0; | |
316 | ||
317 | /* Discard wrong magic numbers. Shouldn't happen. */ | |
318 | hdr_val = extract_unsigned_integer | |
319 | (hdr.magic, sizeof (hdr.magic), byte_order); | |
320 | if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64) | |
321 | return 0; | |
322 | ||
323 | /* Check executable. */ | |
324 | hdr_val = extract_unsigned_integer | |
325 | (hdr.filetype, sizeof (hdr.filetype), byte_order); | |
326 | if (hdr_val == BFD_MACH_O_MH_EXECUTE) | |
327 | return load_addr; | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | /* Get the load address of the executable using dyld list of images. | |
333 | We assume that the dyld info are correct (which is wrong if the target | |
334 | is stopped at the first instruction). */ | |
335 | ||
336 | static CORE_ADDR | |
337 | darwin_read_exec_load_addr_from_dyld (struct darwin_info *info) | |
4141a416 JB |
338 | { |
339 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
4141a416 JB |
340 | int ptr_len = TYPE_LENGTH (ptr_type); |
341 | unsigned int image_info_size = ptr_len * 3; | |
342 | int i; | |
343 | ||
344 | /* Read infos for each solib. One of them should be the executable. */ | |
345 | for (i = 0; i < info->all_image.count; i++) | |
346 | { | |
347 | CORE_ADDR iinfo = info->all_image.info + i * image_info_size; | |
e362b510 | 348 | gdb_byte buf[image_info_size]; |
4141a416 | 349 | CORE_ADDR load_addr; |
4141a416 JB |
350 | |
351 | /* Read image info from inferior. */ | |
352 | if (target_read_memory (iinfo, buf, image_info_size)) | |
353 | break; | |
354 | ||
355 | load_addr = extract_typed_address (buf, ptr_type); | |
ad2073b0 | 356 | if (darwin_validate_exec_header (load_addr) == load_addr) |
4141a416 JB |
357 | return load_addr; |
358 | } | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
ad2073b0 TG |
363 | /* Get the load address of the executable when the PC is at the dyld |
364 | entry point using parameter passed by the kernel (at SP). */ | |
365 | ||
366 | static CORE_ADDR | |
367 | darwin_read_exec_load_addr_at_init (struct darwin_info *info) | |
368 | { | |
369 | struct gdbarch *gdbarch = target_gdbarch (); | |
370 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
371 | int addr_size = gdbarch_addr_bit (gdbarch) / 8; | |
372 | ULONGEST load_ptr_addr; | |
373 | ULONGEST load_addr; | |
374 | gdb_byte buf[8]; | |
375 | ||
376 | /* Get SP. */ | |
377 | if (regcache_cooked_read_unsigned (get_current_regcache (), | |
378 | gdbarch_sp_regnum (gdbarch), | |
379 | &load_ptr_addr) != REG_VALID) | |
380 | return 0; | |
381 | ||
382 | /* Read value at SP (image load address). */ | |
383 | if (target_read_memory (load_ptr_addr, buf, addr_size)) | |
384 | return 0; | |
385 | ||
386 | load_addr = extract_unsigned_integer (buf, addr_size, byte_order); | |
387 | ||
388 | return darwin_validate_exec_header (load_addr); | |
389 | } | |
390 | ||
cf1061c0 TG |
391 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
392 | run time loader. */ | |
066d7383 | 393 | |
693be288 | 394 | static int |
cf1061c0 TG |
395 | darwin_in_dynsym_resolve_code (CORE_ADDR pc) |
396 | { | |
397 | return 0; | |
398 | } | |
399 | ||
0cd61f44 TT |
400 | /* A wrapper for bfd_mach_o_fat_extract that handles reference |
401 | counting properly. This will either return NULL, or return a new | |
402 | reference to a BFD. */ | |
403 | ||
192b62ce | 404 | static gdb_bfd_ref_ptr |
0cd61f44 TT |
405 | gdb_bfd_mach_o_fat_extract (bfd *abfd, bfd_format format, |
406 | const bfd_arch_info_type *arch) | |
407 | { | |
408 | bfd *result = bfd_mach_o_fat_extract (abfd, format, arch); | |
409 | ||
410 | if (result == NULL) | |
411 | return NULL; | |
412 | ||
413 | if (result == abfd) | |
414 | gdb_bfd_ref (result); | |
415 | else | |
416 | gdb_bfd_mark_parent (result, abfd); | |
417 | ||
192b62ce | 418 | return gdb_bfd_ref_ptr (result); |
0cd61f44 TT |
419 | } |
420 | ||
79b32f4a | 421 | /* Return the BFD for the program interpreter. */ |
066d7383 | 422 | |
79b32f4a XR |
423 | static gdb_bfd_ref_ptr |
424 | darwin_get_dyld_bfd () | |
cf1061c0 | 425 | { |
001f13d8 | 426 | char *interp_name; |
f00c55f8 TG |
427 | |
428 | /* This method doesn't work with an attached process. */ | |
429 | if (current_inferior ()->attach_flag) | |
79b32f4a | 430 | return NULL; |
cf1061c0 | 431 | |
cf1061c0 TG |
432 | /* Find the program interpreter. */ |
433 | interp_name = find_program_interpreter (); | |
434 | if (!interp_name) | |
79b32f4a | 435 | return NULL; |
cf1061c0 TG |
436 | |
437 | /* Create a bfd for the interpreter. */ | |
ad80db5b | 438 | gdb_bfd_ref_ptr dyld_bfd (gdb_bfd_open (interp_name, gnutarget)); |
192b62ce | 439 | if (dyld_bfd != NULL) |
cf1061c0 | 440 | { |
192b62ce TT |
441 | gdb_bfd_ref_ptr sub |
442 | (gdb_bfd_mach_o_fat_extract (dyld_bfd.get (), bfd_object, | |
443 | gdbarch_bfd_arch_info (target_gdbarch ()))); | |
cd5a152c | 444 | dyld_bfd = sub; |
d6ad71ba | 445 | } |
79b32f4a XR |
446 | return dyld_bfd; |
447 | } | |
448 | ||
449 | /* Extract dyld_all_image_addr when the process was just created, assuming the | |
450 | current PC is at the entry of the dynamic linker. */ | |
451 | ||
452 | static void | |
453 | darwin_solib_get_all_image_info_addr_at_init (struct darwin_info *info) | |
454 | { | |
455 | CORE_ADDR load_addr = 0; | |
456 | gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd (); | |
457 | ||
192b62ce TT |
458 | if (dyld_bfd == NULL) |
459 | return; | |
70d4c673 | 460 | |
f00c55f8 TG |
461 | /* We find the dynamic linker's base address by examining |
462 | the current pc (which should point at the entry point for the | |
463 | dynamic linker) and subtracting the offset of the entry point. */ | |
464 | load_addr = (regcache_read_pc (get_current_regcache ()) | |
dda83cd7 | 465 | - bfd_get_start_address (dyld_bfd.get ())); |
cf1061c0 TG |
466 | |
467 | /* Now try to set a breakpoint in the dynamic linker. */ | |
ec95993c | 468 | info->all_image_addr = |
192b62ce | 469 | lookup_symbol_from_bfd (dyld_bfd.get (), "_dyld_all_image_infos"); |
cf1061c0 | 470 | |
ec95993c | 471 | if (info->all_image_addr == 0) |
cf1061c0 TG |
472 | return; |
473 | ||
ec95993c | 474 | info->all_image_addr += load_addr; |
f00c55f8 TG |
475 | } |
476 | ||
ad2073b0 | 477 | /* Extract dyld_all_image_addr reading it from |
f00c55f8 TG |
478 | TARGET_OBJECT_DARWIN_DYLD_INFO. */ |
479 | ||
480 | static void | |
ec95993c | 481 | darwin_solib_read_all_image_info_addr (struct darwin_info *info) |
f00c55f8 | 482 | { |
ad2073b0 | 483 | gdb_byte buf[8]; |
f00c55f8 | 484 | LONGEST len; |
ad2073b0 TG |
485 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
486 | ||
487 | /* Sanity check. */ | |
132874d7 | 488 | if (TYPE_LENGTH (ptr_type) > sizeof (buf)) |
ad2073b0 | 489 | return; |
f00c55f8 | 490 | |
8b88a78e PA |
491 | len = target_read (current_top_target (), TARGET_OBJECT_DARWIN_DYLD_INFO, |
492 | NULL, buf, 0, TYPE_LENGTH (ptr_type)); | |
ad2073b0 | 493 | if (len <= 0) |
f00c55f8 TG |
494 | return; |
495 | ||
ad2073b0 TG |
496 | /* The use of BIG endian is intended, as BUF is a raw stream of bytes. This |
497 | makes the support of remote protocol easier. */ | |
498 | info->all_image_addr = extract_unsigned_integer (buf, len, BFD_ENDIAN_BIG); | |
f00c55f8 TG |
499 | } |
500 | ||
501 | /* Shared library startup support. See documentation in solib-svr4.c. */ | |
502 | ||
503 | static void | |
504 | darwin_solib_create_inferior_hook (int from_tty) | |
505 | { | |
ec95993c | 506 | struct darwin_info *info = get_darwin_info (); |
4141a416 | 507 | CORE_ADDR load_addr; |
ec95993c TG |
508 | |
509 | info->all_image_addr = 0; | |
f00c55f8 | 510 | |
ec95993c | 511 | darwin_solib_read_all_image_info_addr (info); |
f00c55f8 | 512 | |
ec95993c TG |
513 | if (info->all_image_addr == 0) |
514 | darwin_solib_get_all_image_info_addr_at_init (info); | |
f00c55f8 | 515 | |
ec95993c | 516 | if (info->all_image_addr == 0) |
f00c55f8 | 517 | return; |
cf1061c0 | 518 | |
ec95993c | 519 | darwin_load_image_infos (info); |
cf1061c0 | 520 | |
4141a416 | 521 | if (!darwin_dyld_version_ok (info)) |
d4ccb5e0 TG |
522 | { |
523 | warning (_("unhandled dyld version (%d)"), info->all_image.version); | |
524 | return; | |
525 | } | |
4141a416 | 526 | |
ad2073b0 TG |
527 | if (info->all_image.count != 0) |
528 | { | |
529 | /* Possible relocate the main executable (PIE). */ | |
530 | load_addr = darwin_read_exec_load_addr_from_dyld (info); | |
531 | } | |
532 | else | |
533 | { | |
534 | /* Possible issue: | |
535 | Do not break on the notifier if dyld is not initialized (deduced from | |
536 | count == 0). In that case, dyld hasn't relocated itself and the | |
537 | notifier may point to a wrong address. */ | |
538 | ||
539 | load_addr = darwin_read_exec_load_addr_at_init (info); | |
540 | } | |
541 | ||
a42d7dd8 | 542 | if (load_addr != 0 && current_program_space->symfile_object_file != NULL) |
4141a416 | 543 | { |
1bdad2e0 | 544 | CORE_ADDR vmaddr; |
4141a416 JB |
545 | |
546 | /* Find the base address of the executable. */ | |
7e10abd1 | 547 | vmaddr = bfd_mach_o_get_base_address (current_program_space->exec_bfd ()); |
4141a416 JB |
548 | |
549 | /* Relocate. */ | |
550 | if (vmaddr != load_addr) | |
a42d7dd8 TT |
551 | objfile_rebase (current_program_space->symfile_object_file, |
552 | load_addr - vmaddr); | |
4141a416 | 553 | } |
79b32f4a XR |
554 | |
555 | /* Set solib notifier (to reload list of shared libraries). */ | |
556 | CORE_ADDR notifier = info->all_image.notifier; | |
557 | ||
558 | if (info->all_image.count == 0) | |
559 | { | |
560 | /* Dyld hasn't yet relocated itself, so the notifier address may | |
561 | be incorrect (as it has to be relocated). */ | |
7e10abd1 TT |
562 | CORE_ADDR start |
563 | = bfd_get_start_address (current_program_space->exec_bfd ()); | |
79b32f4a XR |
564 | if (start == 0) |
565 | notifier = 0; | |
566 | else | |
dda83cd7 SM |
567 | { |
568 | gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd (); | |
569 | if (dyld_bfd != NULL) | |
570 | { | |
571 | CORE_ADDR dyld_bfd_start_address; | |
572 | CORE_ADDR dyld_relocated_base_address; | |
573 | CORE_ADDR pc; | |
574 | ||
575 | dyld_bfd_start_address = bfd_get_start_address (dyld_bfd.get()); | |
576 | ||
577 | /* We find the dynamic linker's base address by examining | |
578 | the current pc (which should point at the entry point | |
579 | for the dynamic linker) and subtracting the offset of | |
580 | the entry point. */ | |
581 | ||
582 | pc = regcache_read_pc (get_current_regcache ()); | |
583 | dyld_relocated_base_address = pc - dyld_bfd_start_address; | |
584 | ||
585 | /* We get the proper notifier relocated address by | |
586 | adding the dyld relocated base address to the current | |
587 | notifier offset value. */ | |
588 | ||
589 | notifier += dyld_relocated_base_address; | |
590 | } | |
591 | } | |
79b32f4a XR |
592 | } |
593 | ||
594 | /* Add the breakpoint which is hit by dyld when the list of solib is | |
595 | modified. */ | |
596 | if (notifier != 0) | |
597 | create_solib_event_breakpoint (target_gdbarch (), notifier); | |
cf1061c0 TG |
598 | } |
599 | ||
600 | static void | |
601 | darwin_clear_solib (void) | |
602 | { | |
ec95993c TG |
603 | struct darwin_info *info = get_darwin_info (); |
604 | ||
605 | info->all_image_addr = 0; | |
606 | info->all_image.version = 0; | |
cf1061c0 TG |
607 | } |
608 | ||
609 | static void | |
610 | darwin_free_so (struct so_list *so) | |
611 | { | |
9ccbfd7b SM |
612 | lm_info_darwin *li = (lm_info_darwin *) so->lm_info; |
613 | ||
614 | delete li; | |
cf1061c0 TG |
615 | } |
616 | ||
617 | /* The section table is built from bfd sections using bfd VMAs. | |
618 | Relocate these VMAs according to solib info. */ | |
066d7383 | 619 | |
cf1061c0 TG |
620 | static void |
621 | darwin_relocate_section_addresses (struct so_list *so, | |
0542c86d | 622 | struct target_section *sec) |
cf1061c0 | 623 | { |
d0e449a1 SM |
624 | lm_info_darwin *li = (lm_info_darwin *) so->lm_info; |
625 | ||
626 | sec->addr += li->lm_addr; | |
627 | sec->endaddr += li->lm_addr; | |
cf1061c0 TG |
628 | |
629 | /* Best effort to set addr_high/addr_low. This is used only by | |
630 | 'info sharedlibary'. */ | |
631 | if (so->addr_high == 0) | |
632 | { | |
633 | so->addr_low = sec->addr; | |
634 | so->addr_high = sec->endaddr; | |
635 | } | |
636 | if (sec->endaddr > so->addr_high) | |
637 | so->addr_high = sec->endaddr; | |
638 | if (sec->addr < so->addr_low) | |
639 | so->addr_low = sec->addr; | |
640 | } | |
641 | \f | |
192b62ce | 642 | static gdb_bfd_ref_ptr |
692d6f97 | 643 | darwin_bfd_open (const char *pathname) |
cf1061c0 | 644 | { |
cf1061c0 | 645 | int found_file; |
cf1061c0 TG |
646 | |
647 | /* Search for shared library file. */ | |
797bc1cb TT |
648 | gdb::unique_xmalloc_ptr<char> found_pathname |
649 | = solib_find (pathname, &found_file); | |
cf1061c0 TG |
650 | if (found_pathname == NULL) |
651 | perror_with_name (pathname); | |
652 | ||
653 | /* Open bfd for shared library. */ | |
797bc1cb | 654 | gdb_bfd_ref_ptr abfd (solib_bfd_fopen (found_pathname.get (), found_file)); |
cf1061c0 | 655 | |
192b62ce TT |
656 | gdb_bfd_ref_ptr res |
657 | (gdb_bfd_mach_o_fat_extract (abfd.get (), bfd_object, | |
658 | gdbarch_bfd_arch_info (target_gdbarch ()))); | |
659 | if (res == NULL) | |
660 | error (_("`%s': not a shared-library: %s"), | |
661 | bfd_get_filename (abfd.get ()), bfd_errmsg (bfd_get_error ())); | |
0cd61f44 | 662 | |
b030cf11 JB |
663 | /* The current filename for fat-binary BFDs is a name generated |
664 | by BFD, usually a string containing the name of the architecture. | |
665 | Reset its value to the actual filename. */ | |
7b958a48 | 666 | bfd_set_filename (res.get (), pathname); |
b030cf11 | 667 | |
cf1061c0 TG |
668 | return res; |
669 | } | |
670 | ||
671 | struct target_so_ops darwin_so_ops; | |
672 | ||
6c265988 | 673 | void _initialize_darwin_solib (); |
cf1061c0 | 674 | void |
6c265988 | 675 | _initialize_darwin_solib () |
cf1061c0 TG |
676 | { |
677 | darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses; | |
678 | darwin_so_ops.free_so = darwin_free_so; | |
679 | darwin_so_ops.clear_solib = darwin_clear_solib; | |
680 | darwin_so_ops.solib_create_inferior_hook = darwin_solib_create_inferior_hook; | |
cf1061c0 TG |
681 | darwin_so_ops.current_sos = darwin_current_sos; |
682 | darwin_so_ops.open_symbol_file_object = open_symbol_file_object; | |
683 | darwin_so_ops.in_dynsym_resolve_code = darwin_in_dynsym_resolve_code; | |
cf1061c0 TG |
684 | darwin_so_ops.bfd_open = darwin_bfd_open; |
685 | } |