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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]; | |
82 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; | |
83 | int len; | |
84 | ||
85 | /* If the structure address is not known, don't continue. */ | |
86 | if (dyld_all_image_addr == 0) | |
87 | return; | |
88 | ||
89 | /* The structure has 4 fields: version (4 bytes), count (4 bytes), | |
90 | info (pointer) and notifier (pointer). */ | |
91 | len = 4 + 4 + 2 * ptr_type->length; | |
92 | gdb_assert (len <= sizeof (buf)); | |
93 | memset (&dyld_all_image, 0, sizeof (dyld_all_image)); | |
94 | ||
95 | /* Read structure raw bytes from target. */ | |
96 | if (target_read_memory (dyld_all_image_addr, buf, len)) | |
97 | return; | |
98 | ||
99 | /* Extract the fields. */ | |
100 | dyld_all_image.version = extract_unsigned_integer (buf, 4); | |
101 | if (dyld_all_image.version != DYLD_VERSION) | |
102 | return; | |
103 | ||
104 | dyld_all_image.count = extract_unsigned_integer (buf + 4, 4); | |
105 | dyld_all_image.info = extract_typed_address (buf + 8, ptr_type); | |
106 | dyld_all_image.notifier = extract_typed_address | |
107 | (buf + 8 + ptr_type->length, ptr_type); | |
108 | } | |
109 | ||
110 | /* Link map info to include in an allocated so_list entry. */ | |
111 | ||
112 | struct lm_info | |
113 | { | |
114 | /* The target location of lm. */ | |
115 | CORE_ADDR lm_addr; | |
116 | }; | |
117 | ||
118 | struct darwin_so_list | |
119 | { | |
120 | /* Common field. */ | |
121 | struct so_list sl; | |
122 | /* Darwin specific data. */ | |
123 | struct lm_info li; | |
124 | }; | |
125 | ||
126 | /* Lookup the value for a specific symbol. */ | |
127 | static CORE_ADDR | |
128 | lookup_symbol_from_bfd (bfd *abfd, char *symname) | |
129 | { | |
130 | long storage_needed; | |
131 | asymbol **symbol_table; | |
132 | unsigned int number_of_symbols; | |
133 | unsigned int i; | |
134 | CORE_ADDR symaddr = 0; | |
135 | ||
136 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
137 | ||
138 | if (storage_needed <= 0) | |
139 | return 0; | |
140 | ||
141 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
142 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
143 | ||
144 | for (i = 0; i < number_of_symbols; i++) | |
145 | { | |
146 | asymbol *sym = symbol_table[i]; | |
147 | if (strcmp (sym->name, symname) == 0 | |
148 | && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0) | |
149 | { | |
150 | /* BFD symbols are section relative. */ | |
151 | symaddr = sym->value + sym->section->vma; | |
152 | break; | |
153 | } | |
154 | } | |
155 | xfree (symbol_table); | |
156 | ||
157 | return symaddr; | |
158 | } | |
159 | ||
160 | /* Return program interpreter string. */ | |
161 | static gdb_byte * | |
162 | find_program_interpreter (void) | |
163 | { | |
164 | gdb_byte *buf = NULL; | |
165 | ||
166 | /* If we have an exec_bfd, use its section table. */ | |
167 | if (exec_bfd) | |
168 | { | |
169 | struct bfd_section *dylinker_sect; | |
170 | ||
171 | dylinker_sect = bfd_get_section_by_name (exec_bfd, "LC_LOAD_DYLINKER"); | |
172 | if (dylinker_sect != NULL) | |
173 | { | |
174 | int sect_size = bfd_section_size (exec_bfd, dylinker_sect); | |
175 | ||
176 | buf = xmalloc (sect_size); | |
177 | if (bfd_get_section_contents (exec_bfd, dylinker_sect, | |
178 | buf, 0, sect_size)) | |
179 | return buf; | |
180 | xfree (buf); | |
181 | } | |
182 | } | |
183 | ||
184 | /* If we didn't find it, read from memory. | |
185 | FIXME: todo. */ | |
186 | return buf; | |
187 | } | |
188 | ||
189 | /* Not used. I don't see how the main symbol file can be found: the | |
190 | interpreter name is needed and it is known from the executable file. | |
191 | Note that darwin-nat.c implements pid_to_exec_file. */ | |
192 | static int | |
193 | open_symbol_file_object (void *from_ttyp) | |
194 | { | |
195 | return 0; | |
196 | } | |
197 | ||
198 | /* Build a list of currently loaded shared objects. See solib-svr4.c */ | |
199 | static struct so_list * | |
200 | darwin_current_sos (void) | |
201 | { | |
202 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; | |
203 | int ptr_len = TYPE_LENGTH (ptr_type); | |
204 | unsigned int image_info_size; | |
205 | CORE_ADDR lm; | |
206 | struct so_list *head = NULL; | |
207 | struct so_list *tail = NULL; | |
208 | int i; | |
209 | ||
210 | /* Be sure image infos are loaded. */ | |
211 | darwin_load_image_infos (); | |
212 | ||
213 | if (dyld_all_image.version != DYLD_VERSION) | |
214 | return NULL; | |
215 | ||
216 | image_info_size = ptr_len * 3; | |
217 | ||
218 | /* Read infos for each solib. | |
219 | This first entry is ignored as this is the executable itself. */ | |
220 | for (i = 1; i < dyld_all_image.count; i++) | |
221 | { | |
222 | CORE_ADDR info = dyld_all_image.info + i * image_info_size; | |
223 | char buf[image_info_size]; | |
224 | CORE_ADDR load_addr; | |
225 | CORE_ADDR path_addr; | |
226 | char *file_path; | |
227 | int errcode; | |
228 | struct darwin_so_list *dnew; | |
229 | struct so_list *new; | |
230 | struct cleanup *old_chain; | |
231 | ||
232 | /* Read image info from inferior. */ | |
233 | if (target_read_memory (info, buf, image_info_size)) | |
234 | break; | |
235 | ||
236 | load_addr = extract_typed_address (buf, ptr_type); | |
237 | path_addr = extract_typed_address (buf + ptr_len, ptr_type); | |
238 | ||
239 | target_read_string (path_addr, &file_path, | |
240 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
241 | if (errcode) | |
242 | break; | |
243 | ||
244 | /* Create and fill the new so_list element. */ | |
245 | dnew = XZALLOC (struct darwin_so_list); | |
246 | new = &dnew->sl; | |
247 | old_chain = make_cleanup (xfree, dnew); | |
248 | ||
249 | new->lm_info = &dnew->li; | |
250 | ||
251 | strncpy (new->so_name, file_path, SO_NAME_MAX_PATH_SIZE - 1); | |
252 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
253 | strcpy (new->so_original_name, new->so_name); | |
254 | xfree (file_path); | |
255 | new->lm_info->lm_addr = load_addr; | |
256 | ||
257 | if (head == NULL) | |
258 | head = new; | |
259 | else | |
260 | tail->next = new; | |
261 | tail = new; | |
262 | ||
263 | discard_cleanups (old_chain); | |
264 | } | |
265 | ||
266 | return head; | |
267 | } | |
268 | ||
269 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
270 | run time loader. */ | |
271 | int | |
272 | darwin_in_dynsym_resolve_code (CORE_ADDR pc) | |
273 | { | |
274 | return 0; | |
275 | } | |
276 | ||
277 | ||
278 | /* No special symbol handling. */ | |
279 | static void | |
280 | darwin_special_symbol_handling (void) | |
281 | { | |
282 | } | |
283 | ||
284 | /* Shared library startup support. See documentation in solib-svr4.c */ | |
285 | static void | |
286 | darwin_solib_create_inferior_hook (void) | |
287 | { | |
288 | struct minimal_symbol *msymbol; | |
289 | char **bkpt_namep; | |
290 | asection *interp_sect; | |
291 | gdb_byte *interp_name; | |
292 | CORE_ADDR sym_addr; | |
293 | CORE_ADDR load_addr = 0; | |
294 | int load_addr_found = 0; | |
295 | int loader_found_in_list = 0; | |
296 | struct so_list *so; | |
297 | bfd *dyld_bfd = NULL; | |
298 | struct inferior *inf = current_inferior (); | |
299 | ||
300 | /* First, remove all the solib event breakpoints. Their addresses | |
301 | may have changed since the last time we ran the program. */ | |
302 | remove_solib_event_breakpoints (); | |
303 | ||
304 | /* Find the program interpreter. */ | |
305 | interp_name = find_program_interpreter (); | |
306 | if (!interp_name) | |
307 | return; | |
308 | ||
309 | /* Create a bfd for the interpreter. */ | |
310 | sym_addr = 0; | |
311 | dyld_bfd = bfd_openr (interp_name, gnutarget); | |
312 | if (dyld_bfd) | |
313 | { | |
314 | bfd *sub; | |
315 | sub = bfd_mach_o_fat_extract (dyld_bfd, bfd_object, | |
a97b0ac8 | 316 | gdbarch_bfd_arch_info (target_gdbarch)); |
cf1061c0 TG |
317 | if (sub) |
318 | dyld_bfd = sub; | |
319 | else | |
320 | { | |
321 | bfd_close (dyld_bfd); | |
322 | dyld_bfd = NULL; | |
323 | } | |
324 | } | |
325 | if (!dyld_bfd) | |
326 | { | |
327 | xfree (interp_name); | |
328 | return; | |
329 | } | |
330 | ||
331 | if (!inf->attach_flag) | |
332 | { | |
333 | /* We find the dynamic linker's base address by examining | |
334 | the current pc (which should point at the entry point for the | |
335 | dynamic linker) and subtracting the offset of the entry point. */ | |
fb14de7b UW |
336 | load_addr = (regcache_read_pc (get_current_regcache ()) |
337 | - bfd_get_start_address (dyld_bfd)); | |
cf1061c0 TG |
338 | } |
339 | else | |
340 | { | |
341 | /* FIXME: todo. | |
342 | Get address of __DATA.__dyld in exec_bfd, read address at offset 0 | |
343 | */ | |
344 | xfree (interp_name); | |
345 | return; | |
346 | } | |
347 | ||
348 | /* Now try to set a breakpoint in the dynamic linker. */ | |
349 | dyld_all_image_addr = | |
350 | lookup_symbol_from_bfd (dyld_bfd, "_dyld_all_image_infos"); | |
351 | ||
352 | bfd_close (dyld_bfd); | |
353 | xfree (interp_name); | |
354 | ||
355 | if (dyld_all_image_addr == 0) | |
356 | return; | |
357 | ||
358 | dyld_all_image_addr += load_addr; | |
359 | ||
360 | darwin_load_image_infos (); | |
361 | ||
362 | if (dyld_all_image.version == DYLD_VERSION) | |
363 | create_solib_event_breakpoint (dyld_all_image.notifier); | |
364 | } | |
365 | ||
366 | static void | |
367 | darwin_clear_solib (void) | |
368 | { | |
369 | dyld_all_image_addr = 0; | |
370 | dyld_all_image.version = 0; | |
371 | } | |
372 | ||
373 | static void | |
374 | darwin_free_so (struct so_list *so) | |
375 | { | |
376 | } | |
377 | ||
378 | /* The section table is built from bfd sections using bfd VMAs. | |
379 | Relocate these VMAs according to solib info. */ | |
380 | static void | |
381 | darwin_relocate_section_addresses (struct so_list *so, | |
0542c86d | 382 | struct target_section *sec) |
cf1061c0 TG |
383 | { |
384 | sec->addr += so->lm_info->lm_addr; | |
385 | sec->endaddr += so->lm_info->lm_addr; | |
386 | ||
387 | /* Best effort to set addr_high/addr_low. This is used only by | |
388 | 'info sharedlibary'. */ | |
389 | if (so->addr_high == 0) | |
390 | { | |
391 | so->addr_low = sec->addr; | |
392 | so->addr_high = sec->endaddr; | |
393 | } | |
394 | if (sec->endaddr > so->addr_high) | |
395 | so->addr_high = sec->endaddr; | |
396 | if (sec->addr < so->addr_low) | |
397 | so->addr_low = sec->addr; | |
398 | } | |
399 | \f | |
400 | static struct symbol * | |
401 | darwin_lookup_lib_symbol (const struct objfile *objfile, | |
402 | const char *name, | |
403 | const char *linkage_name, | |
404 | const domain_enum domain) | |
405 | { | |
406 | return NULL; | |
407 | } | |
408 | ||
409 | static bfd * | |
410 | darwin_bfd_open (char *pathname) | |
411 | { | |
412 | char *found_pathname; | |
413 | int found_file; | |
414 | bfd *abfd; | |
415 | bfd *res; | |
416 | ||
417 | /* Search for shared library file. */ | |
418 | found_pathname = solib_find (pathname, &found_file); | |
419 | if (found_pathname == NULL) | |
420 | perror_with_name (pathname); | |
421 | ||
422 | /* Open bfd for shared library. */ | |
423 | abfd = solib_bfd_fopen (found_pathname, found_file); | |
424 | ||
425 | res = bfd_mach_o_fat_extract (abfd, bfd_object, | |
a97b0ac8 | 426 | gdbarch_bfd_arch_info (target_gdbarch)); |
cf1061c0 TG |
427 | if (!res) |
428 | { | |
429 | bfd_close (abfd); | |
430 | make_cleanup (xfree, found_pathname); | |
431 | error (_("`%s': not a shared-library: %s"), | |
432 | found_pathname, bfd_errmsg (bfd_get_error ())); | |
433 | } | |
434 | return res; | |
435 | } | |
436 | ||
437 | struct target_so_ops darwin_so_ops; | |
438 | ||
439 | void | |
440 | _initialize_darwin_solib (void) | |
441 | { | |
442 | darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses; | |
443 | darwin_so_ops.free_so = darwin_free_so; | |
444 | darwin_so_ops.clear_solib = darwin_clear_solib; | |
445 | darwin_so_ops.solib_create_inferior_hook = darwin_solib_create_inferior_hook; | |
446 | darwin_so_ops.special_symbol_handling = darwin_special_symbol_handling; | |
447 | darwin_so_ops.current_sos = darwin_current_sos; | |
448 | darwin_so_ops.open_symbol_file_object = open_symbol_file_object; | |
449 | darwin_so_ops.in_dynsym_resolve_code = darwin_in_dynsym_resolve_code; | |
450 | darwin_so_ops.lookup_lib_global_symbol = darwin_lookup_lib_symbol; | |
451 | darwin_so_ops.bfd_open = darwin_bfd_open; | |
452 | } |