1 /* Dynamic architecture support for GDB, the GNU debugger. 2 3 Copyright (C) 1998-2013 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 "arch-utils.h" 23 #include "buildsym.h" 24 #include "gdbcmd.h" 25 #include "inferior.h" /* enum CALL_DUMMY_LOCATION et al. */ 26 #include "gdb_string.h" 27 #include "regcache.h" 28 #include "gdb_assert.h" 29 #include "sim-regno.h" 30 #include "gdbcore.h" 31 #include "osabi.h" 32 #include "target-descriptions.h" 33 #include "objfiles.h" 34 #include "language.h" 35 36 #include "version.h" 37 38 #include "floatformat.h" 39 40 41 struct displaced_step_closure * 42 simple_displaced_step_copy_insn (struct gdbarch *gdbarch, 43 CORE_ADDR from, CORE_ADDR to, 44 struct regcache *regs) 45 { 46 size_t len = gdbarch_max_insn_length (gdbarch); 47 gdb_byte *buf = xmalloc (len); 48 49 read_memory (from, buf, len); 50 write_memory (to, buf, len); 51 52 if (debug_displaced) 53 { 54 fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ", 55 paddress (gdbarch, from), paddress (gdbarch, to)); 56 displaced_step_dump_bytes (gdb_stdlog, buf, len); 57 } 58 59 return (struct displaced_step_closure *) buf; 60 } 61 62 63 void 64 simple_displaced_step_free_closure (struct gdbarch *gdbarch, 65 struct displaced_step_closure *closure) 66 { 67 xfree (closure); 68 } 69 70 int 71 default_displaced_step_hw_singlestep (struct gdbarch *gdbarch, 72 struct displaced_step_closure *closure) 73 { 74 return !gdbarch_software_single_step_p (gdbarch); 75 } 76 77 CORE_ADDR 78 displaced_step_at_entry_point (struct gdbarch *gdbarch) 79 { 80 CORE_ADDR addr; 81 int bp_len; 82 83 addr = entry_point_address (); 84 85 /* Inferior calls also use the entry point as a breakpoint location. 86 We don't want displaced stepping to interfere with those 87 breakpoints, so leave space. */ 88 gdbarch_breakpoint_from_pc (gdbarch, &addr, &bp_len); 89 addr += bp_len * 2; 90 91 return addr; 92 } 93 94 int 95 legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum) 96 { 97 /* Only makes sense to supply raw registers. */ 98 gdb_assert (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch)); 99 /* NOTE: cagney/2002-05-13: The old code did it this way and it is 100 suspected that some GDB/SIM combinations may rely on this 101 behavour. The default should be one2one_register_sim_regno 102 (below). */ 103 if (gdbarch_register_name (gdbarch, regnum) != NULL 104 && gdbarch_register_name (gdbarch, regnum)[0] != '\0') 105 return regnum; 106 else 107 return LEGACY_SIM_REGNO_IGNORE; 108 } 109 110 CORE_ADDR 111 generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) 112 { 113 return 0; 114 } 115 116 CORE_ADDR 117 generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) 118 { 119 return 0; 120 } 121 122 int 123 generic_in_solib_return_trampoline (struct gdbarch *gdbarch, 124 CORE_ADDR pc, const char *name) 125 { 126 return 0; 127 } 128 129 int 130 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) 131 { 132 return 0; 133 } 134 135 /* Helper functions for gdbarch_inner_than */ 136 137 int 138 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs) 139 { 140 return (lhs < rhs); 141 } 142 143 int 144 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs) 145 { 146 return (lhs > rhs); 147 } 148 149 /* Misc helper functions for targets. */ 150 151 CORE_ADDR 152 core_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr) 153 { 154 return addr; 155 } 156 157 CORE_ADDR 158 convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr, 159 struct target_ops *targ) 160 { 161 return addr; 162 } 163 164 int 165 no_op_reg_to_regnum (struct gdbarch *gdbarch, int reg) 166 { 167 return reg; 168 } 169 170 void 171 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym) 172 { 173 return; 174 } 175 176 void 177 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym) 178 { 179 return; 180 } 181 182 int 183 cannot_register_not (struct gdbarch *gdbarch, int regnum) 184 { 185 return 0; 186 } 187 188 /* Legacy version of target_virtual_frame_pointer(). Assumes that 189 there is an gdbarch_deprecated_fp_regnum and that it is the same, 190 cooked or raw. */ 191 192 void 193 legacy_virtual_frame_pointer (struct gdbarch *gdbarch, 194 CORE_ADDR pc, 195 int *frame_regnum, 196 LONGEST *frame_offset) 197 { 198 /* FIXME: cagney/2002-09-13: This code is used when identifying the 199 frame pointer of the current PC. It is assuming that a single 200 register and an offset can determine this. I think it should 201 instead generate a byte code expression as that would work better 202 with things like Dwarf2's CFI. */ 203 if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0 204 && gdbarch_deprecated_fp_regnum (gdbarch) 205 < gdbarch_num_regs (gdbarch)) 206 *frame_regnum = gdbarch_deprecated_fp_regnum (gdbarch); 207 else if (gdbarch_sp_regnum (gdbarch) >= 0 208 && gdbarch_sp_regnum (gdbarch) 209 < gdbarch_num_regs (gdbarch)) 210 *frame_regnum = gdbarch_sp_regnum (gdbarch); 211 else 212 /* Should this be an internal error? I guess so, it is reflecting 213 an architectural limitation in the current design. */ 214 internal_error (__FILE__, __LINE__, 215 _("No virtual frame pointer available")); 216 *frame_offset = 0; 217 } 218 219 220 int 221 generic_convert_register_p (struct gdbarch *gdbarch, int regnum, 222 struct type *type) 223 { 224 return 0; 225 } 226 227 int 228 default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) 229 { 230 return 0; 231 } 232 233 int 234 generic_instruction_nullified (struct gdbarch *gdbarch, 235 struct regcache *regcache) 236 { 237 return 0; 238 } 239 240 int 241 default_remote_register_number (struct gdbarch *gdbarch, 242 int regno) 243 { 244 return regno; 245 } 246 247 248 /* Functions to manipulate the endianness of the target. */ 249 250 static int target_byte_order_user = BFD_ENDIAN_UNKNOWN; 251 252 static const char endian_big[] = "big"; 253 static const char endian_little[] = "little"; 254 static const char endian_auto[] = "auto"; 255 static const char *const endian_enum[] = 256 { 257 endian_big, 258 endian_little, 259 endian_auto, 260 NULL, 261 }; 262 static const char *set_endian_string; 263 264 enum bfd_endian 265 selected_byte_order (void) 266 { 267 return target_byte_order_user; 268 } 269 270 /* Called by ``show endian''. */ 271 272 static void 273 show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c, 274 const char *value) 275 { 276 if (target_byte_order_user == BFD_ENDIAN_UNKNOWN) 277 if (gdbarch_byte_order (get_current_arch ()) == BFD_ENDIAN_BIG) 278 fprintf_unfiltered (file, _("The target endianness is set automatically " 279 "(currently big endian)\n")); 280 else 281 fprintf_unfiltered (file, _("The target endianness is set automatically " 282 "(currently little endian)\n")); 283 else 284 if (target_byte_order_user == BFD_ENDIAN_BIG) 285 fprintf_unfiltered (file, 286 _("The target is assumed to be big endian\n")); 287 else 288 fprintf_unfiltered (file, 289 _("The target is assumed to be little endian\n")); 290 } 291 292 static void 293 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c) 294 { 295 struct gdbarch_info info; 296 297 gdbarch_info_init (&info); 298 299 if (set_endian_string == endian_auto) 300 { 301 target_byte_order_user = BFD_ENDIAN_UNKNOWN; 302 if (! gdbarch_update_p (info)) 303 internal_error (__FILE__, __LINE__, 304 _("set_endian: architecture update failed")); 305 } 306 else if (set_endian_string == endian_little) 307 { 308 info.byte_order = BFD_ENDIAN_LITTLE; 309 if (! gdbarch_update_p (info)) 310 printf_unfiltered (_("Little endian target not supported by GDB\n")); 311 else 312 target_byte_order_user = BFD_ENDIAN_LITTLE; 313 } 314 else if (set_endian_string == endian_big) 315 { 316 info.byte_order = BFD_ENDIAN_BIG; 317 if (! gdbarch_update_p (info)) 318 printf_unfiltered (_("Big endian target not supported by GDB\n")); 319 else 320 target_byte_order_user = BFD_ENDIAN_BIG; 321 } 322 else 323 internal_error (__FILE__, __LINE__, 324 _("set_endian: bad value")); 325 326 show_endian (gdb_stdout, from_tty, NULL, NULL); 327 } 328 329 /* Given SELECTED, a currently selected BFD architecture, and 330 TARGET_DESC, the current target description, return what 331 architecture to use. 332 333 SELECTED may be NULL, in which case we return the architecture 334 associated with TARGET_DESC. If SELECTED specifies a variant 335 of the architecture associtated with TARGET_DESC, return the 336 more specific of the two. 337 338 If SELECTED is a different architecture, but it is accepted as 339 compatible by the target, we can use the target architecture. 340 341 If SELECTED is obviously incompatible, warn the user. */ 342 343 static const struct bfd_arch_info * 344 choose_architecture_for_target (const struct target_desc *target_desc, 345 const struct bfd_arch_info *selected) 346 { 347 const struct bfd_arch_info *from_target = tdesc_architecture (target_desc); 348 const struct bfd_arch_info *compat1, *compat2; 349 350 if (selected == NULL) 351 return from_target; 352 353 if (from_target == NULL) 354 return selected; 355 356 /* struct bfd_arch_info objects are singletons: that is, there's 357 supposed to be exactly one instance for a given machine. So you 358 can tell whether two are equivalent by comparing pointers. */ 359 if (from_target == selected) 360 return selected; 361 362 /* BFD's 'A->compatible (A, B)' functions return zero if A and B are 363 incompatible. But if they are compatible, it returns the 'more 364 featureful' of the two arches. That is, if A can run code 365 written for B, but B can't run code written for A, then it'll 366 return A. 367 368 Some targets (e.g. MIPS as of 2006-12-04) don't fully 369 implement this, instead always returning NULL or the first 370 argument. We detect that case by checking both directions. */ 371 372 compat1 = selected->compatible (selected, from_target); 373 compat2 = from_target->compatible (from_target, selected); 374 375 if (compat1 == NULL && compat2 == NULL) 376 { 377 /* BFD considers the architectures incompatible. Check our 378 target description whether it accepts SELECTED as compatible 379 anyway. */ 380 if (tdesc_compatible_p (target_desc, selected)) 381 return from_target; 382 383 warning (_("Selected architecture %s is not compatible " 384 "with reported target architecture %s"), 385 selected->printable_name, from_target->printable_name); 386 return selected; 387 } 388 389 if (compat1 == NULL) 390 return compat2; 391 if (compat2 == NULL) 392 return compat1; 393 if (compat1 == compat2) 394 return compat1; 395 396 /* If the two didn't match, but one of them was a default 397 architecture, assume the more specific one is correct. This 398 handles the case where an executable or target description just 399 says "mips", but the other knows which MIPS variant. */ 400 if (compat1->the_default) 401 return compat2; 402 if (compat2->the_default) 403 return compat1; 404 405 /* We have no idea which one is better. This is a bug, but not 406 a critical problem; warn the user. */ 407 warning (_("Selected architecture %s is ambiguous with " 408 "reported target architecture %s"), 409 selected->printable_name, from_target->printable_name); 410 return selected; 411 } 412 413 /* Functions to manipulate the architecture of the target. */ 414 415 enum set_arch { set_arch_auto, set_arch_manual }; 416 417 static const struct bfd_arch_info *target_architecture_user; 418 419 static const char *set_architecture_string; 420 421 const char * 422 selected_architecture_name (void) 423 { 424 if (target_architecture_user == NULL) 425 return NULL; 426 else 427 return set_architecture_string; 428 } 429 430 /* Called if the user enters ``show architecture'' without an 431 argument. */ 432 433 static void 434 show_architecture (struct ui_file *file, int from_tty, 435 struct cmd_list_element *c, const char *value) 436 { 437 if (target_architecture_user == NULL) 438 fprintf_filtered (file, _("The target architecture is set " 439 "automatically (currently %s)\n"), 440 gdbarch_bfd_arch_info (get_current_arch ())->printable_name); 441 else 442 fprintf_filtered (file, _("The target architecture is assumed to be %s\n"), 443 set_architecture_string); 444 } 445 446 447 /* Called if the user enters ``set architecture'' with or without an 448 argument. */ 449 450 static void 451 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c) 452 { 453 struct gdbarch_info info; 454 455 gdbarch_info_init (&info); 456 457 if (strcmp (set_architecture_string, "auto") == 0) 458 { 459 target_architecture_user = NULL; 460 if (!gdbarch_update_p (info)) 461 internal_error (__FILE__, __LINE__, 462 _("could not select an architecture automatically")); 463 } 464 else 465 { 466 info.bfd_arch_info = bfd_scan_arch (set_architecture_string); 467 if (info.bfd_arch_info == NULL) 468 internal_error (__FILE__, __LINE__, 469 _("set_architecture: bfd_scan_arch failed")); 470 if (gdbarch_update_p (info)) 471 target_architecture_user = info.bfd_arch_info; 472 else 473 printf_unfiltered (_("Architecture `%s' not recognized.\n"), 474 set_architecture_string); 475 } 476 show_architecture (gdb_stdout, from_tty, NULL, NULL); 477 } 478 479 /* Try to select a global architecture that matches "info". Return 480 non-zero if the attempt succeds. */ 481 int 482 gdbarch_update_p (struct gdbarch_info info) 483 { 484 struct gdbarch *new_gdbarch; 485 486 /* Check for the current file. */ 487 if (info.abfd == NULL) 488 info.abfd = exec_bfd; 489 if (info.abfd == NULL) 490 info.abfd = core_bfd; 491 492 /* Check for the current target description. */ 493 if (info.target_desc == NULL) 494 info.target_desc = target_current_description (); 495 496 new_gdbarch = gdbarch_find_by_info (info); 497 498 /* If there no architecture by that name, reject the request. */ 499 if (new_gdbarch == NULL) 500 { 501 if (gdbarch_debug) 502 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " 503 "Architecture not found\n"); 504 return 0; 505 } 506 507 /* If it is the same old architecture, accept the request (but don't 508 swap anything). */ 509 if (new_gdbarch == target_gdbarch ()) 510 { 511 if (gdbarch_debug) 512 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " 513 "Architecture %s (%s) unchanged\n", 514 host_address_to_string (new_gdbarch), 515 gdbarch_bfd_arch_info (new_gdbarch)->printable_name); 516 return 1; 517 } 518 519 /* It's a new architecture, swap it in. */ 520 if (gdbarch_debug) 521 fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " 522 "New architecture %s (%s) selected\n", 523 host_address_to_string (new_gdbarch), 524 gdbarch_bfd_arch_info (new_gdbarch)->printable_name); 525 set_target_gdbarch (new_gdbarch); 526 527 return 1; 528 } 529 530 /* Return the architecture for ABFD. If no suitable architecture 531 could be find, return NULL. */ 532 533 struct gdbarch * 534 gdbarch_from_bfd (bfd *abfd) 535 { 536 struct gdbarch_info info; 537 gdbarch_info_init (&info); 538 539 info.abfd = abfd; 540 return gdbarch_find_by_info (info); 541 } 542 543 /* Set the dynamic target-system-dependent parameters (architecture, 544 byte-order) using information found in the BFD */ 545 546 void 547 set_gdbarch_from_file (bfd *abfd) 548 { 549 struct gdbarch_info info; 550 struct gdbarch *gdbarch; 551 552 gdbarch_info_init (&info); 553 info.abfd = abfd; 554 info.target_desc = target_current_description (); 555 gdbarch = gdbarch_find_by_info (info); 556 557 if (gdbarch == NULL) 558 error (_("Architecture of file not recognized.")); 559 set_target_gdbarch (gdbarch); 560 } 561 562 /* Initialize the current architecture. Update the ``set 563 architecture'' command so that it specifies a list of valid 564 architectures. */ 565 566 #ifdef DEFAULT_BFD_ARCH 567 extern const bfd_arch_info_type DEFAULT_BFD_ARCH; 568 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH; 569 #else 570 static const bfd_arch_info_type *default_bfd_arch; 571 #endif 572 573 #ifdef DEFAULT_BFD_VEC 574 extern const bfd_target DEFAULT_BFD_VEC; 575 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC; 576 #else 577 static const bfd_target *default_bfd_vec; 578 #endif 579 580 static int default_byte_order = BFD_ENDIAN_UNKNOWN; 581 582 void 583 initialize_current_architecture (void) 584 { 585 const char **arches = gdbarch_printable_names (); 586 struct gdbarch_info info; 587 588 /* determine a default architecture and byte order. */ 589 gdbarch_info_init (&info); 590 591 /* Find a default architecture. */ 592 if (default_bfd_arch == NULL) 593 { 594 /* Choose the architecture by taking the first one 595 alphabetically. */ 596 const char *chosen = arches[0]; 597 const char **arch; 598 for (arch = arches; *arch != NULL; arch++) 599 { 600 if (strcmp (*arch, chosen) < 0) 601 chosen = *arch; 602 } 603 if (chosen == NULL) 604 internal_error (__FILE__, __LINE__, 605 _("initialize_current_architecture: No arch")); 606 default_bfd_arch = bfd_scan_arch (chosen); 607 if (default_bfd_arch == NULL) 608 internal_error (__FILE__, __LINE__, 609 _("initialize_current_architecture: Arch not found")); 610 } 611 612 info.bfd_arch_info = default_bfd_arch; 613 614 /* Take several guesses at a byte order. */ 615 if (default_byte_order == BFD_ENDIAN_UNKNOWN 616 && default_bfd_vec != NULL) 617 { 618 /* Extract BFD's default vector's byte order. */ 619 switch (default_bfd_vec->byteorder) 620 { 621 case BFD_ENDIAN_BIG: 622 default_byte_order = BFD_ENDIAN_BIG; 623 break; 624 case BFD_ENDIAN_LITTLE: 625 default_byte_order = BFD_ENDIAN_LITTLE; 626 break; 627 default: 628 break; 629 } 630 } 631 if (default_byte_order == BFD_ENDIAN_UNKNOWN) 632 { 633 /* look for ``*el-*'' in the target name. */ 634 const char *chp; 635 chp = strchr (target_name, '-'); 636 if (chp != NULL 637 && chp - 2 >= target_name 638 && strncmp (chp - 2, "el", 2) == 0) 639 default_byte_order = BFD_ENDIAN_LITTLE; 640 } 641 if (default_byte_order == BFD_ENDIAN_UNKNOWN) 642 { 643 /* Wire it to big-endian!!! */ 644 default_byte_order = BFD_ENDIAN_BIG; 645 } 646 647 info.byte_order = default_byte_order; 648 info.byte_order_for_code = info.byte_order; 649 650 if (! gdbarch_update_p (info)) 651 internal_error (__FILE__, __LINE__, 652 _("initialize_current_architecture: Selection of " 653 "initial architecture failed")); 654 655 /* Create the ``set architecture'' command appending ``auto'' to the 656 list of architectures. */ 657 { 658 /* Append ``auto''. */ 659 int nr; 660 for (nr = 0; arches[nr] != NULL; nr++); 661 arches = xrealloc (arches, sizeof (char*) * (nr + 2)); 662 arches[nr + 0] = "auto"; 663 arches[nr + 1] = NULL; 664 add_setshow_enum_cmd ("architecture", class_support, 665 arches, &set_architecture_string, 666 _("Set architecture of target."), 667 _("Show architecture of target."), NULL, 668 set_architecture, show_architecture, 669 &setlist, &showlist); 670 add_alias_cmd ("processor", "architecture", class_support, 1, &setlist); 671 } 672 } 673 674 675 /* Initialize a gdbarch info to values that will be automatically 676 overridden. Note: Originally, this ``struct info'' was initialized 677 using memset(0). Unfortunately, that ran into problems, namely 678 BFD_ENDIAN_BIG is zero. An explicit initialization function that 679 can explicitly set each field to a well defined value is used. */ 680 681 void 682 gdbarch_info_init (struct gdbarch_info *info) 683 { 684 memset (info, 0, sizeof (struct gdbarch_info)); 685 info->byte_order = BFD_ENDIAN_UNKNOWN; 686 info->byte_order_for_code = info->byte_order; 687 info->osabi = GDB_OSABI_UNINITIALIZED; 688 } 689 690 /* Similar to init, but this time fill in the blanks. Information is 691 obtained from the global "set ..." options and explicitly 692 initialized INFO fields. */ 693 694 void 695 gdbarch_info_fill (struct gdbarch_info *info) 696 { 697 /* "(gdb) set architecture ...". */ 698 if (info->bfd_arch_info == NULL 699 && target_architecture_user) 700 info->bfd_arch_info = target_architecture_user; 701 /* From the file. */ 702 if (info->bfd_arch_info == NULL 703 && info->abfd != NULL 704 && bfd_get_arch (info->abfd) != bfd_arch_unknown 705 && bfd_get_arch (info->abfd) != bfd_arch_obscure) 706 info->bfd_arch_info = bfd_get_arch_info (info->abfd); 707 /* From the target. */ 708 if (info->target_desc != NULL) 709 info->bfd_arch_info = choose_architecture_for_target 710 (info->target_desc, info->bfd_arch_info); 711 /* From the default. */ 712 if (info->bfd_arch_info == NULL) 713 info->bfd_arch_info = default_bfd_arch; 714 715 /* "(gdb) set byte-order ...". */ 716 if (info->byte_order == BFD_ENDIAN_UNKNOWN 717 && target_byte_order_user != BFD_ENDIAN_UNKNOWN) 718 info->byte_order = target_byte_order_user; 719 /* From the INFO struct. */ 720 if (info->byte_order == BFD_ENDIAN_UNKNOWN 721 && info->abfd != NULL) 722 info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG 723 : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE 724 : BFD_ENDIAN_UNKNOWN); 725 /* From the default. */ 726 if (info->byte_order == BFD_ENDIAN_UNKNOWN) 727 info->byte_order = default_byte_order; 728 info->byte_order_for_code = info->byte_order; 729 730 /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */ 731 /* From the manual override, or from file. */ 732 if (info->osabi == GDB_OSABI_UNINITIALIZED) 733 info->osabi = gdbarch_lookup_osabi (info->abfd); 734 /* From the target. */ 735 if (info->osabi == GDB_OSABI_UNKNOWN && info->target_desc != NULL) 736 info->osabi = tdesc_osabi (info->target_desc); 737 /* From the configured default. */ 738 #ifdef GDB_OSABI_DEFAULT 739 if (info->osabi == GDB_OSABI_UNKNOWN) 740 info->osabi = GDB_OSABI_DEFAULT; 741 #endif 742 743 /* Must have at least filled in the architecture. */ 744 gdb_assert (info->bfd_arch_info != NULL); 745 } 746 747 /* Return "current" architecture. If the target is running, this is 748 the architecture of the selected frame. Otherwise, the "current" 749 architecture defaults to the target architecture. 750 751 This function should normally be called solely by the command 752 interpreter routines to determine the architecture to execute a 753 command in. */ 754 struct gdbarch * 755 get_current_arch (void) 756 { 757 if (has_stack_frames ()) 758 return get_frame_arch (get_selected_frame (NULL)); 759 else 760 return target_gdbarch (); 761 } 762 763 int 764 default_has_shared_address_space (struct gdbarch *gdbarch) 765 { 766 /* Simply say no. In most unix-like targets each inferior/process 767 has its own address space. */ 768 return 0; 769 } 770 771 int 772 default_fast_tracepoint_valid_at (struct gdbarch *gdbarch, 773 CORE_ADDR addr, int *isize, char **msg) 774 { 775 /* We don't know if maybe the target has some way to do fast 776 tracepoints that doesn't need gdbarch, so always say yes. */ 777 if (msg) 778 *msg = NULL; 779 return 1; 780 } 781 782 void 783 default_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, 784 int *kindptr) 785 { 786 gdbarch_breakpoint_from_pc (gdbarch, pcptr, kindptr); 787 } 788 789 void 790 default_gen_return_address (struct gdbarch *gdbarch, 791 struct agent_expr *ax, struct axs_value *value, 792 CORE_ADDR scope) 793 { 794 error (_("This architecture has no method to collect a return address.")); 795 } 796 797 int 798 default_return_in_first_hidden_param_p (struct gdbarch *gdbarch, 799 struct type *type) 800 { 801 /* Usually, the return value's address is stored the in the "first hidden" 802 parameter if the return value should be passed by reference, as 803 specified in ABI. */ 804 return language_pass_by_reference (type); 805 } 806 807 /* */ 808 809 /* -Wmissing-prototypes */ 810 extern initialize_file_ftype _initialize_gdbarch_utils; 811 812 void 813 _initialize_gdbarch_utils (void) 814 { 815 add_setshow_enum_cmd ("endian", class_support, 816 endian_enum, &set_endian_string, 817 _("Set endianness of target."), 818 _("Show endianness of target."), 819 NULL, set_endian, show_endian, 820 &setlist, &showlist); 821 } 822