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cf1061c0 TG |
1 | /* Handle Darwin shared libraries for GDB, the GNU Debugger. |
2 | ||
3 | Copyright (C) 2009 Free Software Foundation, Inc. | |
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" | |
44 | ||
45 | struct gdb_dyld_image_info | |
46 | { | |
47 | /* Base address (which corresponds to the Mach-O header). */ | |
48 | CORE_ADDR mach_header; | |
49 | /* Image file path. */ | |
50 | CORE_ADDR file_path; | |
51 | /* st.m_time of image file. */ | |
52 | unsigned long mtime; | |
53 | }; | |
54 | ||
55 | /* Content of inferior dyld_all_image_infos structure. */ | |
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. */ | |
69 | #define DYLD_VERSION 1 | |
70 | ||
71 | /* Address of structure dyld_all_image_infos in inferior. */ | |
72 | static CORE_ADDR dyld_all_image_addr; | |
73 | ||
74 | /* Gdb copy of dyld_all_info_infos. */ | |
75 | static struct gdb_dyld_all_image_infos dyld_all_image; | |
76 | ||
77 | /* Read dyld_all_image from inferior. */ | |
78 | static void | |
79 | darwin_load_image_infos (void) | |
80 | { | |
81 | gdb_byte buf[24]; | |
e17a4113 | 82 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
cf1061c0 TG |
83 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; |
84 | int len; | |
85 | ||
86 | /* If the structure address is not known, don't continue. */ | |
87 | if (dyld_all_image_addr == 0) | |
88 | return; | |
89 | ||
90 | /* The structure has 4 fields: version (4 bytes), count (4 bytes), | |
91 | info (pointer) and notifier (pointer). */ | |
92 | len = 4 + 4 + 2 * ptr_type->length; | |
93 | gdb_assert (len <= sizeof (buf)); | |
94 | memset (&dyld_all_image, 0, sizeof (dyld_all_image)); | |
95 | ||
96 | /* Read structure raw bytes from target. */ | |
97 | if (target_read_memory (dyld_all_image_addr, buf, len)) | |
98 | return; | |
99 | ||
100 | /* Extract the fields. */ | |
e17a4113 | 101 | dyld_all_image.version = extract_unsigned_integer (buf, 4, byte_order); |
cf1061c0 TG |
102 | if (dyld_all_image.version != DYLD_VERSION) |
103 | return; | |
104 | ||
e17a4113 | 105 | dyld_all_image.count = extract_unsigned_integer (buf + 4, 4, byte_order); |
cf1061c0 TG |
106 | dyld_all_image.info = extract_typed_address (buf + 8, ptr_type); |
107 | dyld_all_image.notifier = extract_typed_address | |
108 | (buf + 8 + ptr_type->length, ptr_type); | |
109 | } | |
110 | ||
111 | /* Link map info to include in an allocated so_list entry. */ | |
112 | ||
113 | struct lm_info | |
114 | { | |
115 | /* The target location of lm. */ | |
116 | CORE_ADDR lm_addr; | |
117 | }; | |
118 | ||
119 | struct darwin_so_list | |
120 | { | |
121 | /* Common field. */ | |
122 | struct so_list sl; | |
123 | /* Darwin specific data. */ | |
124 | struct lm_info li; | |
125 | }; | |
126 | ||
127 | /* Lookup the value for a specific symbol. */ | |
128 | static CORE_ADDR | |
129 | lookup_symbol_from_bfd (bfd *abfd, char *symname) | |
130 | { | |
131 | long storage_needed; | |
132 | asymbol **symbol_table; | |
133 | unsigned int number_of_symbols; | |
134 | unsigned int i; | |
135 | CORE_ADDR symaddr = 0; | |
136 | ||
137 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
138 | ||
139 | if (storage_needed <= 0) | |
140 | return 0; | |
141 | ||
142 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
143 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
144 | ||
145 | for (i = 0; i < number_of_symbols; i++) | |
146 | { | |
147 | asymbol *sym = symbol_table[i]; | |
148 | if (strcmp (sym->name, symname) == 0 | |
149 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) | |
150 | { | |
151 | /* BFD symbols are section relative. */ | |
152 | symaddr = sym->value + sym->section->vma; | |
153 | break; | |
154 | } | |
155 | } | |
156 | xfree (symbol_table); | |
157 | ||
158 | return symaddr; | |
159 | } | |
160 | ||
161 | /* Return program interpreter string. */ | |
023e4e81 | 162 | |
cf1061c0 TG |
163 | static gdb_byte * |
164 | find_program_interpreter (void) | |
165 | { | |
166 | gdb_byte *buf = NULL; | |
167 | ||
023e4e81 | 168 | /* If we have an exec_bfd, get the interpreter from the load commands. */ |
cf1061c0 TG |
169 | if (exec_bfd) |
170 | { | |
023e4e81 | 171 | bfd_mach_o_load_command *cmd; |
cf1061c0 | 172 | |
023e4e81 TG |
173 | if (bfd_mach_o_lookup_command (exec_bfd, |
174 | BFD_MACH_O_LC_LOAD_DYLINKER, &cmd) == 1) | |
175 | return cmd->command.dylinker.name_str; | |
cf1061c0 TG |
176 | } |
177 | ||
178 | /* If we didn't find it, read from memory. | |
179 | FIXME: todo. */ | |
180 | return buf; | |
181 | } | |
182 | ||
183 | /* Not used. I don't see how the main symbol file can be found: the | |
184 | interpreter name is needed and it is known from the executable file. | |
185 | Note that darwin-nat.c implements pid_to_exec_file. */ | |
186 | static int | |
187 | open_symbol_file_object (void *from_ttyp) | |
188 | { | |
189 | return 0; | |
190 | } | |
191 | ||
192 | /* Build a list of currently loaded shared objects. See solib-svr4.c */ | |
193 | static struct so_list * | |
194 | darwin_current_sos (void) | |
195 | { | |
196 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; | |
197 | int ptr_len = TYPE_LENGTH (ptr_type); | |
198 | unsigned int image_info_size; | |
199 | CORE_ADDR lm; | |
200 | struct so_list *head = NULL; | |
201 | struct so_list *tail = NULL; | |
202 | int i; | |
203 | ||
204 | /* Be sure image infos are loaded. */ | |
205 | darwin_load_image_infos (); | |
206 | ||
207 | if (dyld_all_image.version != DYLD_VERSION) | |
208 | return NULL; | |
209 | ||
210 | image_info_size = ptr_len * 3; | |
211 | ||
212 | /* Read infos for each solib. | |
213 | This first entry is ignored as this is the executable itself. */ | |
214 | for (i = 1; i < dyld_all_image.count; i++) | |
215 | { | |
216 | CORE_ADDR info = dyld_all_image.info + i * image_info_size; | |
217 | char buf[image_info_size]; | |
218 | CORE_ADDR load_addr; | |
219 | CORE_ADDR path_addr; | |
220 | char *file_path; | |
221 | int errcode; | |
222 | struct darwin_so_list *dnew; | |
223 | struct so_list *new; | |
224 | struct cleanup *old_chain; | |
225 | ||
226 | /* Read image info from inferior. */ | |
227 | if (target_read_memory (info, buf, image_info_size)) | |
228 | break; | |
229 | ||
230 | load_addr = extract_typed_address (buf, ptr_type); | |
231 | path_addr = extract_typed_address (buf + ptr_len, ptr_type); | |
232 | ||
233 | target_read_string (path_addr, &file_path, | |
234 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
235 | if (errcode) | |
236 | break; | |
237 | ||
238 | /* Create and fill the new so_list element. */ | |
239 | dnew = XZALLOC (struct darwin_so_list); | |
240 | new = &dnew->sl; | |
241 | old_chain = make_cleanup (xfree, dnew); | |
242 | ||
243 | new->lm_info = &dnew->li; | |
244 | ||
245 | strncpy (new->so_name, file_path, SO_NAME_MAX_PATH_SIZE - 1); | |
246 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
247 | strcpy (new->so_original_name, new->so_name); | |
248 | xfree (file_path); | |
249 | new->lm_info->lm_addr = load_addr; | |
250 | ||
251 | if (head == NULL) | |
252 | head = new; | |
253 | else | |
254 | tail->next = new; | |
255 | tail = new; | |
256 | ||
257 | discard_cleanups (old_chain); | |
258 | } | |
259 | ||
260 | return head; | |
261 | } | |
262 | ||
263 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
264 | run time loader. */ | |
265 | int | |
266 | darwin_in_dynsym_resolve_code (CORE_ADDR pc) | |
267 | { | |
268 | return 0; | |
269 | } | |
270 | ||
271 | ||
272 | /* No special symbol handling. */ | |
273 | static void | |
274 | darwin_special_symbol_handling (void) | |
275 | { | |
276 | } | |
277 | ||
278 | /* Shared library startup support. See documentation in solib-svr4.c */ | |
279 | static void | |
280 | darwin_solib_create_inferior_hook (void) | |
281 | { | |
282 | struct minimal_symbol *msymbol; | |
283 | char **bkpt_namep; | |
284 | asection *interp_sect; | |
285 | gdb_byte *interp_name; | |
286 | CORE_ADDR sym_addr; | |
287 | CORE_ADDR load_addr = 0; | |
288 | int load_addr_found = 0; | |
289 | int loader_found_in_list = 0; | |
290 | struct so_list *so; | |
291 | bfd *dyld_bfd = NULL; | |
292 | struct inferior *inf = current_inferior (); | |
293 | ||
294 | /* First, remove all the solib event breakpoints. Their addresses | |
295 | may have changed since the last time we ran the program. */ | |
296 | remove_solib_event_breakpoints (); | |
297 | ||
298 | /* Find the program interpreter. */ | |
299 | interp_name = find_program_interpreter (); | |
300 | if (!interp_name) | |
301 | return; | |
302 | ||
303 | /* Create a bfd for the interpreter. */ | |
304 | sym_addr = 0; | |
305 | dyld_bfd = bfd_openr (interp_name, gnutarget); | |
306 | if (dyld_bfd) | |
307 | { | |
308 | bfd *sub; | |
309 | sub = bfd_mach_o_fat_extract (dyld_bfd, bfd_object, | |
a97b0ac8 | 310 | gdbarch_bfd_arch_info (target_gdbarch)); |
cf1061c0 TG |
311 | if (sub) |
312 | dyld_bfd = sub; | |
313 | else | |
314 | { | |
315 | bfd_close (dyld_bfd); | |
316 | dyld_bfd = NULL; | |
317 | } | |
318 | } | |
319 | if (!dyld_bfd) | |
023e4e81 TG |
320 | return; |
321 | ||
cf1061c0 TG |
322 | if (!inf->attach_flag) |
323 | { | |
324 | /* We find the dynamic linker's base address by examining | |
325 | the current pc (which should point at the entry point for the | |
326 | dynamic linker) and subtracting the offset of the entry point. */ | |
fb14de7b UW |
327 | load_addr = (regcache_read_pc (get_current_regcache ()) |
328 | - bfd_get_start_address (dyld_bfd)); | |
cf1061c0 TG |
329 | } |
330 | else | |
331 | { | |
332 | /* FIXME: todo. | |
023e4e81 | 333 | Get address of __DATA.__dyld in exec_bfd, read address at offset 0. |
cf1061c0 | 334 | */ |
cf1061c0 TG |
335 | return; |
336 | } | |
337 | ||
338 | /* Now try to set a breakpoint in the dynamic linker. */ | |
339 | dyld_all_image_addr = | |
340 | lookup_symbol_from_bfd (dyld_bfd, "_dyld_all_image_infos"); | |
341 | ||
342 | bfd_close (dyld_bfd); | |
cf1061c0 TG |
343 | |
344 | if (dyld_all_image_addr == 0) | |
345 | return; | |
346 | ||
347 | dyld_all_image_addr += load_addr; | |
348 | ||
349 | darwin_load_image_infos (); | |
350 | ||
351 | if (dyld_all_image.version == DYLD_VERSION) | |
a6d9a66e | 352 | create_solib_event_breakpoint (target_gdbarch, dyld_all_image.notifier); |
cf1061c0 TG |
353 | } |
354 | ||
355 | static void | |
356 | darwin_clear_solib (void) | |
357 | { | |
358 | dyld_all_image_addr = 0; | |
359 | dyld_all_image.version = 0; | |
360 | } | |
361 | ||
362 | static void | |
363 | darwin_free_so (struct so_list *so) | |
364 | { | |
365 | } | |
366 | ||
367 | /* The section table is built from bfd sections using bfd VMAs. | |
368 | Relocate these VMAs according to solib info. */ | |
369 | static void | |
370 | darwin_relocate_section_addresses (struct so_list *so, | |
0542c86d | 371 | struct target_section *sec) |
cf1061c0 TG |
372 | { |
373 | sec->addr += so->lm_info->lm_addr; | |
374 | sec->endaddr += so->lm_info->lm_addr; | |
375 | ||
376 | /* Best effort to set addr_high/addr_low. This is used only by | |
377 | 'info sharedlibary'. */ | |
378 | if (so->addr_high == 0) | |
379 | { | |
380 | so->addr_low = sec->addr; | |
381 | so->addr_high = sec->endaddr; | |
382 | } | |
383 | if (sec->endaddr > so->addr_high) | |
384 | so->addr_high = sec->endaddr; | |
385 | if (sec->addr < so->addr_low) | |
386 | so->addr_low = sec->addr; | |
387 | } | |
388 | \f | |
389 | static struct symbol * | |
390 | darwin_lookup_lib_symbol (const struct objfile *objfile, | |
391 | const char *name, | |
392 | const char *linkage_name, | |
393 | const domain_enum domain) | |
394 | { | |
395 | return NULL; | |
396 | } | |
397 | ||
398 | static bfd * | |
399 | darwin_bfd_open (char *pathname) | |
400 | { | |
401 | char *found_pathname; | |
402 | int found_file; | |
403 | bfd *abfd; | |
404 | bfd *res; | |
405 | ||
406 | /* Search for shared library file. */ | |
407 | found_pathname = solib_find (pathname, &found_file); | |
408 | if (found_pathname == NULL) | |
409 | perror_with_name (pathname); | |
410 | ||
411 | /* Open bfd for shared library. */ | |
412 | abfd = solib_bfd_fopen (found_pathname, found_file); | |
413 | ||
414 | res = bfd_mach_o_fat_extract (abfd, bfd_object, | |
a97b0ac8 | 415 | gdbarch_bfd_arch_info (target_gdbarch)); |
cf1061c0 TG |
416 | if (!res) |
417 | { | |
418 | bfd_close (abfd); | |
419 | make_cleanup (xfree, found_pathname); | |
420 | error (_("`%s': not a shared-library: %s"), | |
421 | found_pathname, bfd_errmsg (bfd_get_error ())); | |
422 | } | |
423 | return res; | |
424 | } | |
425 | ||
426 | struct target_so_ops darwin_so_ops; | |
427 | ||
428 | void | |
429 | _initialize_darwin_solib (void) | |
430 | { | |
431 | darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses; | |
432 | darwin_so_ops.free_so = darwin_free_so; | |
433 | darwin_so_ops.clear_solib = darwin_clear_solib; | |
434 | darwin_so_ops.solib_create_inferior_hook = darwin_solib_create_inferior_hook; | |
435 | darwin_so_ops.special_symbol_handling = darwin_special_symbol_handling; | |
436 | darwin_so_ops.current_sos = darwin_current_sos; | |
437 | darwin_so_ops.open_symbol_file_object = open_symbol_file_object; | |
438 | darwin_so_ops.in_dynsym_resolve_code = darwin_in_dynsym_resolve_code; | |
439 | darwin_so_ops.lookup_lib_global_symbol = darwin_lookup_lib_symbol; | |
440 | darwin_so_ops.bfd_open = darwin_bfd_open; | |
441 | } |