| 1 | /* Frame unwinder for ia64 frames using the libunwind library. |
| 2 | |
| 3 | Copyright (C) 2003-2017 Free Software Foundation, Inc. |
| 4 | |
| 5 | Written by Jeff Johnston, contributed by Red Hat Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | |
| 24 | #include "inferior.h" |
| 25 | #include "frame.h" |
| 26 | #include "frame-base.h" |
| 27 | #include "frame-unwind.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "gdbtypes.h" |
| 30 | #include "symtab.h" |
| 31 | #include "objfiles.h" |
| 32 | #include "regcache.h" |
| 33 | |
| 34 | #include <dlfcn.h> |
| 35 | |
| 36 | #include "ia64-libunwind-tdep.h" |
| 37 | |
| 38 | #include "complaints.h" |
| 39 | #include "common/preprocessor.h" |
| 40 | |
| 41 | /* IA-64 is the only target that currently uses ia64-libunwind-tdep. |
| 42 | Note how UNW_TARGET, UNW_OBJ, etc. are compile time constants below. |
| 43 | Those come from libunwind's headers, and are target dependent. |
| 44 | Also, some of libunwind's typedefs are target dependent, as e.g., |
| 45 | unw_word_t. If some other target wants to use this, we will need |
| 46 | to do some abstracting in order to make it possible to select which |
| 47 | libunwind we're talking to at runtime (and have one per arch). */ |
| 48 | |
| 49 | /* The following two macros are normally defined in <endian.h>. |
| 50 | But systems such as ia64-hpux do not provide such header, so |
| 51 | we just define them here if not already defined. */ |
| 52 | #ifndef __LITTLE_ENDIAN |
| 53 | #define __LITTLE_ENDIAN 1234 |
| 54 | #endif |
| 55 | #ifndef __BIG_ENDIAN |
| 56 | #define __BIG_ENDIAN 4321 |
| 57 | #endif |
| 58 | |
| 59 | static int libunwind_initialized; |
| 60 | static struct gdbarch_data *libunwind_descr_handle; |
| 61 | |
| 62 | /* Required function pointers from libunwind. */ |
| 63 | typedef int (unw_get_reg_p_ftype) (unw_cursor_t *, unw_regnum_t, unw_word_t *); |
| 64 | static unw_get_reg_p_ftype *unw_get_reg_p; |
| 65 | typedef int (unw_get_fpreg_p_ftype) (unw_cursor_t *, unw_regnum_t, |
| 66 | unw_fpreg_t *); |
| 67 | static unw_get_fpreg_p_ftype *unw_get_fpreg_p; |
| 68 | typedef int (unw_get_saveloc_p_ftype) (unw_cursor_t *, unw_regnum_t, |
| 69 | unw_save_loc_t *); |
| 70 | static unw_get_saveloc_p_ftype *unw_get_saveloc_p; |
| 71 | typedef int (unw_is_signal_frame_p_ftype) (unw_cursor_t *); |
| 72 | static unw_is_signal_frame_p_ftype *unw_is_signal_frame_p; |
| 73 | typedef int (unw_step_p_ftype) (unw_cursor_t *); |
| 74 | static unw_step_p_ftype *unw_step_p; |
| 75 | typedef int (unw_init_remote_p_ftype) (unw_cursor_t *, unw_addr_space_t, |
| 76 | void *); |
| 77 | static unw_init_remote_p_ftype *unw_init_remote_p; |
| 78 | typedef unw_addr_space_t (unw_create_addr_space_p_ftype) (unw_accessors_t *, |
| 79 | int); |
| 80 | static unw_create_addr_space_p_ftype *unw_create_addr_space_p; |
| 81 | typedef void (unw_destroy_addr_space_p_ftype) (unw_addr_space_t); |
| 82 | static unw_destroy_addr_space_p_ftype *unw_destroy_addr_space_p; |
| 83 | typedef int (unw_search_unwind_table_p_ftype) (unw_addr_space_t, unw_word_t, |
| 84 | unw_dyn_info_t *, |
| 85 | unw_proc_info_t *, int, void *); |
| 86 | static unw_search_unwind_table_p_ftype *unw_search_unwind_table_p; |
| 87 | typedef unw_word_t (unw_find_dyn_list_p_ftype) (unw_addr_space_t, |
| 88 | unw_dyn_info_t *, void *); |
| 89 | static unw_find_dyn_list_p_ftype *unw_find_dyn_list_p; |
| 90 | |
| 91 | |
| 92 | struct libunwind_frame_cache |
| 93 | { |
| 94 | CORE_ADDR base; |
| 95 | CORE_ADDR func_addr; |
| 96 | unw_cursor_t cursor; |
| 97 | unw_addr_space_t as; |
| 98 | }; |
| 99 | |
| 100 | /* We need to qualify the function names with a platform-specific prefix |
| 101 | to match the names used by the libunwind library. The UNW_OBJ macro is |
| 102 | provided by the libunwind.h header file. */ |
| 103 | |
| 104 | #ifndef LIBUNWIND_SO |
| 105 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
| 106 | only library, not a runtime one. */ |
| 107 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.8" |
| 108 | |
| 109 | /* Provide also compatibility with older .so. The two APIs are compatible, .8 |
| 110 | is only extended a bit, GDB does not use the extended API at all. */ |
| 111 | #define LIBUNWIND_SO_7 "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" |
| 112 | #endif |
| 113 | |
| 114 | static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
| 115 | static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); |
| 116 | static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); |
| 117 | static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); |
| 118 | static char *step_name = STRINGIFY(UNW_OBJ(step)); |
| 119 | static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); |
| 120 | static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space)); |
| 121 | static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space)); |
| 122 | static char *search_unwind_table_name |
| 123 | = STRINGIFY(UNW_OBJ(search_unwind_table)); |
| 124 | static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); |
| 125 | |
| 126 | static struct libunwind_descr * |
| 127 | libunwind_descr (struct gdbarch *gdbarch) |
| 128 | { |
| 129 | return ((struct libunwind_descr *) |
| 130 | gdbarch_data (gdbarch, libunwind_descr_handle)); |
| 131 | } |
| 132 | |
| 133 | static void * |
| 134 | libunwind_descr_init (struct gdbarch *gdbarch) |
| 135 | { |
| 136 | struct libunwind_descr *descr |
| 137 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct libunwind_descr); |
| 138 | |
| 139 | return descr; |
| 140 | } |
| 141 | |
| 142 | void |
| 143 | libunwind_frame_set_descr (struct gdbarch *gdbarch, |
| 144 | struct libunwind_descr *descr) |
| 145 | { |
| 146 | struct libunwind_descr *arch_descr; |
| 147 | |
| 148 | gdb_assert (gdbarch != NULL); |
| 149 | |
| 150 | arch_descr = ((struct libunwind_descr *) |
| 151 | gdbarch_data (gdbarch, libunwind_descr_handle)); |
| 152 | |
| 153 | if (arch_descr == NULL) |
| 154 | { |
| 155 | /* First time here. Must initialize data area. */ |
| 156 | arch_descr = (struct libunwind_descr *) libunwind_descr_init (gdbarch); |
| 157 | deprecated_set_gdbarch_data (gdbarch, |
| 158 | libunwind_descr_handle, arch_descr); |
| 159 | } |
| 160 | |
| 161 | /* Copy new descriptor info into arch descriptor. */ |
| 162 | arch_descr->gdb2uw = descr->gdb2uw; |
| 163 | arch_descr->uw2gdb = descr->uw2gdb; |
| 164 | arch_descr->is_fpreg = descr->is_fpreg; |
| 165 | arch_descr->accessors = descr->accessors; |
| 166 | arch_descr->special_accessors = descr->special_accessors; |
| 167 | } |
| 168 | |
| 169 | static struct libunwind_frame_cache * |
| 170 | libunwind_frame_cache (struct frame_info *this_frame, void **this_cache) |
| 171 | { |
| 172 | unw_accessors_t *acc; |
| 173 | unw_addr_space_t as; |
| 174 | unw_word_t fp; |
| 175 | unw_regnum_t uw_sp_regnum; |
| 176 | struct libunwind_frame_cache *cache; |
| 177 | struct libunwind_descr *descr; |
| 178 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 179 | int i, ret; |
| 180 | |
| 181 | if (*this_cache) |
| 182 | return (struct libunwind_frame_cache *) *this_cache; |
| 183 | |
| 184 | /* Allocate a new cache. */ |
| 185 | cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache); |
| 186 | |
| 187 | cache->func_addr = get_frame_func (this_frame); |
| 188 | if (cache->func_addr == 0) |
| 189 | /* This can happen when the frame corresponds to a function for which |
| 190 | there is no debugging information nor any entry in the symbol table. |
| 191 | This is probably a static function for which an entry in the symbol |
| 192 | table was not created when the objfile got linked (observed in |
| 193 | libpthread.so on ia64-hpux). |
| 194 | |
| 195 | The best we can do, in that case, is use the frame PC as the function |
| 196 | address. We don't need to give up since we still have the unwind |
| 197 | record to help us perform the unwinding. There is also another |
| 198 | compelling to continue, because abandonning now means stopping |
| 199 | the backtrace, which can never be helpful for the user. */ |
| 200 | cache->func_addr = get_frame_pc (this_frame); |
| 201 | |
| 202 | /* Get a libunwind cursor to the previous frame. |
| 203 | |
| 204 | We do this by initializing a cursor. Libunwind treats a new cursor |
| 205 | as the top of stack and will get the current register set via the |
| 206 | libunwind register accessor. Now, we provide the platform-specific |
| 207 | accessors and we set up the register accessor to use the frame |
| 208 | register unwinding interfaces so that we properly get the registers |
| 209 | for the current frame rather than the top. We then use the unw_step |
| 210 | function to move the libunwind cursor back one frame. We can later |
| 211 | use this cursor to find previous registers via the unw_get_reg |
| 212 | interface which will invoke libunwind's special logic. */ |
| 213 | descr = libunwind_descr (gdbarch); |
| 214 | acc = (unw_accessors_t *) descr->accessors; |
| 215 | as = unw_create_addr_space_p (acc, |
| 216 | gdbarch_byte_order (gdbarch) |
| 217 | == BFD_ENDIAN_BIG |
| 218 | ? __BIG_ENDIAN |
| 219 | : __LITTLE_ENDIAN); |
| 220 | |
| 221 | unw_init_remote_p (&cache->cursor, as, this_frame); |
| 222 | if (unw_step_p (&cache->cursor) < 0) |
| 223 | { |
| 224 | unw_destroy_addr_space_p (as); |
| 225 | return NULL; |
| 226 | } |
| 227 | |
| 228 | /* To get base address, get sp from previous frame. */ |
| 229 | uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch)); |
| 230 | ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp); |
| 231 | if (ret < 0) |
| 232 | { |
| 233 | unw_destroy_addr_space_p (as); |
| 234 | error (_("Can't get libunwind sp register.")); |
| 235 | } |
| 236 | |
| 237 | cache->base = (CORE_ADDR)fp; |
| 238 | cache->as = as; |
| 239 | |
| 240 | *this_cache = cache; |
| 241 | return cache; |
| 242 | } |
| 243 | |
| 244 | void |
| 245 | libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache) |
| 246 | { |
| 247 | struct libunwind_frame_cache *cache |
| 248 | = (struct libunwind_frame_cache *) this_cache; |
| 249 | |
| 250 | if (cache->as) |
| 251 | unw_destroy_addr_space_p (cache->as); |
| 252 | } |
| 253 | |
| 254 | unw_word_t |
| 255 | libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg) |
| 256 | { |
| 257 | return unw_find_dyn_list_p (as, di, arg); |
| 258 | } |
| 259 | |
| 260 | /* Verify if there is sufficient libunwind information for the frame to use |
| 261 | libunwind frame unwinding. */ |
| 262 | int |
| 263 | libunwind_frame_sniffer (const struct frame_unwind *self, |
| 264 | struct frame_info *this_frame, void **this_cache) |
| 265 | { |
| 266 | unw_cursor_t cursor; |
| 267 | unw_accessors_t *acc; |
| 268 | unw_addr_space_t as; |
| 269 | struct libunwind_descr *descr; |
| 270 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 271 | int i, ret; |
| 272 | |
| 273 | /* To test for libunwind unwind support, initialize a cursor to |
| 274 | the current frame and try to back up. We use this same method |
| 275 | when setting up the frame cache (see libunwind_frame_cache()). |
| 276 | If libunwind returns success for this operation, it means that |
| 277 | it has found sufficient libunwind unwinding information to do so. */ |
| 278 | |
| 279 | descr = libunwind_descr (gdbarch); |
| 280 | acc = (unw_accessors_t *) descr->accessors; |
| 281 | as = unw_create_addr_space_p (acc, |
| 282 | gdbarch_byte_order (gdbarch) |
| 283 | == BFD_ENDIAN_BIG |
| 284 | ? __BIG_ENDIAN |
| 285 | : __LITTLE_ENDIAN); |
| 286 | |
| 287 | ret = unw_init_remote_p (&cursor, as, this_frame); |
| 288 | |
| 289 | if (ret < 0) |
| 290 | { |
| 291 | unw_destroy_addr_space_p (as); |
| 292 | return 0; |
| 293 | } |
| 294 | |
| 295 | |
| 296 | /* Check to see if we have libunwind info by checking if we are in a |
| 297 | signal frame. If it doesn't return an error, we have libunwind info |
| 298 | and can use libunwind. */ |
| 299 | ret = unw_is_signal_frame_p (&cursor); |
| 300 | unw_destroy_addr_space_p (as); |
| 301 | |
| 302 | if (ret < 0) |
| 303 | return 0; |
| 304 | |
| 305 | return 1; |
| 306 | } |
| 307 | |
| 308 | void |
| 309 | libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache, |
| 310 | struct frame_id *this_id) |
| 311 | { |
| 312 | struct libunwind_frame_cache *cache = |
| 313 | libunwind_frame_cache (this_frame, this_cache); |
| 314 | |
| 315 | if (cache != NULL) |
| 316 | (*this_id) = frame_id_build (cache->base, cache->func_addr); |
| 317 | } |
| 318 | |
| 319 | struct value * |
| 320 | libunwind_frame_prev_register (struct frame_info *this_frame, |
| 321 | void **this_cache, int regnum) |
| 322 | { |
| 323 | struct libunwind_frame_cache *cache = |
| 324 | libunwind_frame_cache (this_frame, this_cache); |
| 325 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 326 | |
| 327 | void *ptr; |
| 328 | unw_cursor_t *c; |
| 329 | unw_save_loc_t sl; |
| 330 | int i, ret; |
| 331 | unw_word_t intval; |
| 332 | unw_fpreg_t fpval; |
| 333 | unw_regnum_t uw_regnum; |
| 334 | struct libunwind_descr *descr; |
| 335 | struct value *val = NULL; |
| 336 | |
| 337 | if (cache == NULL) |
| 338 | return frame_unwind_got_constant (this_frame, regnum, 0); |
| 339 | |
| 340 | /* Convert from gdb register number to libunwind register number. */ |
| 341 | descr = libunwind_descr (get_frame_arch (this_frame)); |
| 342 | uw_regnum = descr->gdb2uw (regnum); |
| 343 | |
| 344 | gdb_assert (regnum >= 0); |
| 345 | |
| 346 | if (!target_has_registers) |
| 347 | error (_("No registers.")); |
| 348 | |
| 349 | if (uw_regnum < 0) |
| 350 | return frame_unwind_got_constant (this_frame, regnum, 0); |
| 351 | |
| 352 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) |
| 353 | return frame_unwind_got_constant (this_frame, regnum, 0); |
| 354 | |
| 355 | switch (sl.type) |
| 356 | { |
| 357 | case UNW_SLT_MEMORY: |
| 358 | val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr); |
| 359 | break; |
| 360 | |
| 361 | case UNW_SLT_REG: |
| 362 | val = frame_unwind_got_register (this_frame, regnum, |
| 363 | descr->uw2gdb (sl.u.regnum)); |
| 364 | break; |
| 365 | case UNW_SLT_NONE: |
| 366 | { |
| 367 | /* The register is not stored at a specific memory address nor |
| 368 | inside another register. So use libunwind to fetch the register |
| 369 | value for us, and create a constant value with the result. */ |
| 370 | if (descr->is_fpreg (uw_regnum)) |
| 371 | { |
| 372 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); |
| 373 | if (ret < 0) |
| 374 | return frame_unwind_got_constant (this_frame, regnum, 0); |
| 375 | val = frame_unwind_got_bytes (this_frame, regnum, |
| 376 | (gdb_byte *) &fpval); |
| 377 | } |
| 378 | else |
| 379 | { |
| 380 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); |
| 381 | if (ret < 0) |
| 382 | return frame_unwind_got_constant (this_frame, regnum, 0); |
| 383 | val = frame_unwind_got_constant (this_frame, regnum, intval); |
| 384 | } |
| 385 | break; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | return val; |
| 390 | } |
| 391 | |
| 392 | /* The following is a glue routine to call the libunwind unwind table |
| 393 | search function to get unwind information for a specified ip address. */ |
| 394 | int |
| 395 | libunwind_search_unwind_table (void *as, long ip, void *di, |
| 396 | void *pi, int need_unwind_info, void *args) |
| 397 | { |
| 398 | return unw_search_unwind_table_p (*(unw_addr_space_t *) as, (unw_word_t) ip, |
| 399 | (unw_dyn_info_t *) di, |
| 400 | (unw_proc_info_t *) pi, need_unwind_info, |
| 401 | args); |
| 402 | } |
| 403 | |
| 404 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
| 405 | int |
| 406 | libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self, |
| 407 | struct frame_info *this_frame, |
| 408 | void **this_cache) |
| 409 | { |
| 410 | unw_cursor_t cursor; |
| 411 | unw_accessors_t *acc; |
| 412 | unw_addr_space_t as; |
| 413 | struct libunwind_descr *descr; |
| 414 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 415 | int i, ret; |
| 416 | |
| 417 | /* To test for libunwind unwind support, initialize a cursor to the |
| 418 | current frame and try to back up. We use this same method when |
| 419 | setting up the frame cache (see libunwind_frame_cache()). If |
| 420 | libunwind returns success for this operation, it means that it |
| 421 | has found sufficient libunwind unwinding information to do |
| 422 | so. */ |
| 423 | |
| 424 | descr = libunwind_descr (gdbarch); |
| 425 | acc = (unw_accessors_t *) descr->accessors; |
| 426 | as = unw_create_addr_space_p (acc, |
| 427 | gdbarch_byte_order (gdbarch) |
| 428 | == BFD_ENDIAN_BIG |
| 429 | ? __BIG_ENDIAN |
| 430 | : __LITTLE_ENDIAN); |
| 431 | |
| 432 | ret = unw_init_remote_p (&cursor, as, this_frame); |
| 433 | |
| 434 | if (ret < 0) |
| 435 | { |
| 436 | unw_destroy_addr_space_p (as); |
| 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | /* Check to see if we are in a signal frame. */ |
| 441 | ret = unw_is_signal_frame_p (&cursor); |
| 442 | unw_destroy_addr_space_p (as); |
| 443 | if (ret > 0) |
| 444 | return 1; |
| 445 | |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | /* The following routine is for accessing special registers of the top frame. |
| 450 | A special set of accessors must be given that work without frame info. |
| 451 | This is used by ia64 to access the rse registers r32-r127. While they |
| 452 | are usually located at BOF, this is not always true and only the libunwind |
| 453 | info can decipher where they actually are. */ |
| 454 | int |
| 455 | libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache, |
| 456 | int regnum, void *buf) |
| 457 | { |
| 458 | unw_cursor_t cursor; |
| 459 | unw_accessors_t *acc; |
| 460 | unw_addr_space_t as; |
| 461 | struct libunwind_descr *descr; |
| 462 | int ret; |
| 463 | unw_regnum_t uw_regnum; |
| 464 | unw_word_t intval; |
| 465 | unw_fpreg_t fpval; |
| 466 | void *ptr; |
| 467 | |
| 468 | |
| 469 | descr = libunwind_descr (gdbarch); |
| 470 | acc = (unw_accessors_t *) descr->special_accessors; |
| 471 | as = unw_create_addr_space_p (acc, |
| 472 | gdbarch_byte_order (gdbarch) |
| 473 | == BFD_ENDIAN_BIG |
| 474 | ? __BIG_ENDIAN |
| 475 | : __LITTLE_ENDIAN); |
| 476 | |
| 477 | ret = unw_init_remote_p (&cursor, as, regcache); |
| 478 | if (ret < 0) |
| 479 | { |
| 480 | unw_destroy_addr_space_p (as); |
| 481 | return -1; |
| 482 | } |
| 483 | |
| 484 | uw_regnum = descr->gdb2uw (regnum); |
| 485 | |
| 486 | if (descr->is_fpreg (uw_regnum)) |
| 487 | { |
| 488 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); |
| 489 | ptr = &fpval; |
| 490 | } |
| 491 | else |
| 492 | { |
| 493 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); |
| 494 | ptr = &intval; |
| 495 | } |
| 496 | |
| 497 | unw_destroy_addr_space_p (as); |
| 498 | |
| 499 | if (ret < 0) |
| 500 | return -1; |
| 501 | |
| 502 | if (buf) |
| 503 | memcpy (buf, ptr, register_size (gdbarch, regnum)); |
| 504 | |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | static int |
| 509 | libunwind_load (void) |
| 510 | { |
| 511 | void *handle; |
| 512 | char *so_error = NULL; |
| 513 | |
| 514 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); |
| 515 | if (handle == NULL) |
| 516 | { |
| 517 | so_error = xstrdup (dlerror ()); |
| 518 | #ifdef LIBUNWIND_SO_7 |
| 519 | handle = dlopen (LIBUNWIND_SO_7, RTLD_NOW); |
| 520 | #endif /* LIBUNWIND_SO_7 */ |
| 521 | } |
| 522 | if (handle == NULL) |
| 523 | { |
| 524 | fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"), |
| 525 | LIBUNWIND_SO, so_error); |
| 526 | #ifdef LIBUNWIND_SO_7 |
| 527 | fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"), |
| 528 | LIBUNWIND_SO_7, dlerror ()); |
| 529 | #endif /* LIBUNWIND_SO_7 */ |
| 530 | } |
| 531 | xfree (so_error); |
| 532 | if (handle == NULL) |
| 533 | return 0; |
| 534 | |
| 535 | /* Initialize pointers to the dynamic library functions we will use. */ |
| 536 | |
| 537 | unw_get_reg_p = (unw_get_reg_p_ftype *) dlsym (handle, get_reg_name); |
| 538 | if (unw_get_reg_p == NULL) |
| 539 | return 0; |
| 540 | |
| 541 | unw_get_fpreg_p = (unw_get_fpreg_p_ftype *) dlsym (handle, get_fpreg_name); |
| 542 | if (unw_get_fpreg_p == NULL) |
| 543 | return 0; |
| 544 | |
| 545 | unw_get_saveloc_p |
| 546 | = (unw_get_saveloc_p_ftype *) dlsym (handle, get_saveloc_name); |
| 547 | if (unw_get_saveloc_p == NULL) |
| 548 | return 0; |
| 549 | |
| 550 | unw_is_signal_frame_p |
| 551 | = (unw_is_signal_frame_p_ftype *) dlsym (handle, is_signal_frame_name); |
| 552 | if (unw_is_signal_frame_p == NULL) |
| 553 | return 0; |
| 554 | |
| 555 | unw_step_p = (unw_step_p_ftype *) dlsym (handle, step_name); |
| 556 | if (unw_step_p == NULL) |
| 557 | return 0; |
| 558 | |
| 559 | unw_init_remote_p |
| 560 | = (unw_init_remote_p_ftype *) dlsym (handle, init_remote_name); |
| 561 | if (unw_init_remote_p == NULL) |
| 562 | return 0; |
| 563 | |
| 564 | unw_create_addr_space_p |
| 565 | = (unw_create_addr_space_p_ftype *) dlsym (handle, create_addr_space_name); |
| 566 | if (unw_create_addr_space_p == NULL) |
| 567 | return 0; |
| 568 | |
| 569 | unw_destroy_addr_space_p |
| 570 | = (unw_destroy_addr_space_p_ftype *) dlsym (handle, |
| 571 | destroy_addr_space_name); |
| 572 | if (unw_destroy_addr_space_p == NULL) |
| 573 | return 0; |
| 574 | |
| 575 | unw_search_unwind_table_p |
| 576 | = (unw_search_unwind_table_p_ftype *) dlsym (handle, |
| 577 | search_unwind_table_name); |
| 578 | if (unw_search_unwind_table_p == NULL) |
| 579 | return 0; |
| 580 | |
| 581 | unw_find_dyn_list_p |
| 582 | = (unw_find_dyn_list_p_ftype *) dlsym (handle, find_dyn_list_name); |
| 583 | if (unw_find_dyn_list_p == NULL) |
| 584 | return 0; |
| 585 | |
| 586 | return 1; |
| 587 | } |
| 588 | |
| 589 | int |
| 590 | libunwind_is_initialized (void) |
| 591 | { |
| 592 | return libunwind_initialized; |
| 593 | } |
| 594 | |
| 595 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 596 | void _initialize_libunwind_frame (void); |
| 597 | |
| 598 | void |
| 599 | _initialize_libunwind_frame (void) |
| 600 | { |
| 601 | libunwind_descr_handle |
| 602 | = gdbarch_data_register_post_init (libunwind_descr_init); |
| 603 | |
| 604 | libunwind_initialized = libunwind_load (); |
| 605 | } |