| 1 | /* Dynamic architecture support for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software |
| 4 | Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | |
| 25 | #include "arch-utils.h" |
| 26 | #include "buildsym.h" |
| 27 | #include "gdbcmd.h" |
| 28 | #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */ |
| 29 | #include "gdb_string.h" |
| 30 | #include "regcache.h" |
| 31 | #include "gdb_assert.h" |
| 32 | #include "sim-regno.h" |
| 33 | #include "gdbcore.h" |
| 34 | #include "osabi.h" |
| 35 | |
| 36 | #include "version.h" |
| 37 | |
| 38 | #include "floatformat.h" |
| 39 | |
| 40 | /* Implementation of extract return value that grubs around in the |
| 41 | register cache. */ |
| 42 | void |
| 43 | legacy_extract_return_value (struct type *type, struct regcache *regcache, |
| 44 | gdb_byte *valbuf) |
| 45 | { |
| 46 | char *registers = deprecated_grub_regcache_for_registers (regcache); |
| 47 | gdb_byte *buf = valbuf; |
| 48 | DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */ |
| 49 | } |
| 50 | |
| 51 | /* Implementation of store return value that grubs the register cache. |
| 52 | Takes a local copy of the buffer to avoid const problems. */ |
| 53 | void |
| 54 | legacy_store_return_value (struct type *type, struct regcache *regcache, |
| 55 | const gdb_byte *buf) |
| 56 | { |
| 57 | gdb_byte *b = alloca (TYPE_LENGTH (type)); |
| 58 | gdb_assert (regcache == current_regcache); |
| 59 | memcpy (b, buf, TYPE_LENGTH (type)); |
| 60 | DEPRECATED_STORE_RETURN_VALUE (type, b); |
| 61 | } |
| 62 | |
| 63 | int |
| 64 | always_use_struct_convention (int gcc_p, struct type *value_type) |
| 65 | { |
| 66 | return 1; |
| 67 | } |
| 68 | |
| 69 | enum return_value_convention |
| 70 | legacy_return_value (struct gdbarch *gdbarch, struct type *valtype, |
| 71 | struct regcache *regcache, gdb_byte *readbuf, |
| 72 | const gdb_byte *writebuf) |
| 73 | { |
| 74 | /* NOTE: cagney/2004-06-13: The gcc_p parameter to |
| 75 | USE_STRUCT_CONVENTION isn't used. */ |
| 76 | int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
| 77 | || TYPE_CODE (valtype) == TYPE_CODE_UNION |
| 78 | || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) |
| 79 | && DEPRECATED_USE_STRUCT_CONVENTION (0, valtype)); |
| 80 | |
| 81 | if (writebuf != NULL) |
| 82 | { |
| 83 | gdb_assert (!struct_return); |
| 84 | /* NOTE: cagney/2004-06-13: See stack.c:return_command. Old |
| 85 | architectures don't expect STORE_RETURN_VALUE to handle small |
| 86 | structures. Should not be called with such types. */ |
| 87 | gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_STRUCT |
| 88 | && TYPE_CODE (valtype) != TYPE_CODE_UNION); |
| 89 | STORE_RETURN_VALUE (valtype, regcache, writebuf); |
| 90 | } |
| 91 | |
| 92 | if (readbuf != NULL) |
| 93 | { |
| 94 | gdb_assert (!struct_return); |
| 95 | EXTRACT_RETURN_VALUE (valtype, regcache, readbuf); |
| 96 | } |
| 97 | |
| 98 | if (struct_return) |
| 99 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 100 | else |
| 101 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 102 | } |
| 103 | |
| 104 | int |
| 105 | legacy_register_sim_regno (int regnum) |
| 106 | { |
| 107 | /* Only makes sense to supply raw registers. */ |
| 108 | gdb_assert (regnum >= 0 && regnum < NUM_REGS); |
| 109 | /* NOTE: cagney/2002-05-13: The old code did it this way and it is |
| 110 | suspected that some GDB/SIM combinations may rely on this |
| 111 | behavour. The default should be one2one_register_sim_regno |
| 112 | (below). */ |
| 113 | if (REGISTER_NAME (regnum) != NULL |
| 114 | && REGISTER_NAME (regnum)[0] != '\0') |
| 115 | return regnum; |
| 116 | else |
| 117 | return LEGACY_SIM_REGNO_IGNORE; |
| 118 | } |
| 119 | |
| 120 | CORE_ADDR |
| 121 | generic_skip_trampoline_code (CORE_ADDR pc) |
| 122 | { |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | CORE_ADDR |
| 127 | generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 128 | { |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | int |
| 133 | generic_in_solib_return_trampoline (CORE_ADDR pc, char *name) |
| 134 | { |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | int |
| 139 | generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 140 | { |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | void |
| 145 | generic_remote_translate_xfer_address (struct gdbarch *gdbarch, |
| 146 | struct regcache *regcache, |
| 147 | CORE_ADDR gdb_addr, int gdb_len, |
| 148 | CORE_ADDR * rem_addr, int *rem_len) |
| 149 | { |
| 150 | *rem_addr = gdb_addr; |
| 151 | *rem_len = gdb_len; |
| 152 | } |
| 153 | |
| 154 | /* Helper functions for INNER_THAN */ |
| 155 | |
| 156 | int |
| 157 | core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs) |
| 158 | { |
| 159 | return (lhs < rhs); |
| 160 | } |
| 161 | |
| 162 | int |
| 163 | core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs) |
| 164 | { |
| 165 | return (lhs > rhs); |
| 166 | } |
| 167 | |
| 168 | |
| 169 | /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */ |
| 170 | |
| 171 | const struct floatformat * |
| 172 | default_float_format (struct gdbarch *gdbarch) |
| 173 | { |
| 174 | int byte_order = gdbarch_byte_order (gdbarch); |
| 175 | switch (byte_order) |
| 176 | { |
| 177 | case BFD_ENDIAN_BIG: |
| 178 | return &floatformat_ieee_single_big; |
| 179 | case BFD_ENDIAN_LITTLE: |
| 180 | return &floatformat_ieee_single_little; |
| 181 | default: |
| 182 | internal_error (__FILE__, __LINE__, |
| 183 | _("default_float_format: bad byte order")); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | |
| 188 | const struct floatformat * |
| 189 | default_double_format (struct gdbarch *gdbarch) |
| 190 | { |
| 191 | int byte_order = gdbarch_byte_order (gdbarch); |
| 192 | switch (byte_order) |
| 193 | { |
| 194 | case BFD_ENDIAN_BIG: |
| 195 | return &floatformat_ieee_double_big; |
| 196 | case BFD_ENDIAN_LITTLE: |
| 197 | return &floatformat_ieee_double_little; |
| 198 | default: |
| 199 | internal_error (__FILE__, __LINE__, |
| 200 | _("default_double_format: bad byte order")); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | /* Misc helper functions for targets. */ |
| 205 | |
| 206 | CORE_ADDR |
| 207 | core_addr_identity (CORE_ADDR addr) |
| 208 | { |
| 209 | return addr; |
| 210 | } |
| 211 | |
| 212 | CORE_ADDR |
| 213 | convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr, |
| 214 | struct target_ops *targ) |
| 215 | { |
| 216 | return addr; |
| 217 | } |
| 218 | |
| 219 | int |
| 220 | no_op_reg_to_regnum (int reg) |
| 221 | { |
| 222 | return reg; |
| 223 | } |
| 224 | |
| 225 | void |
| 226 | default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym) |
| 227 | { |
| 228 | return; |
| 229 | } |
| 230 | |
| 231 | void |
| 232 | default_coff_make_msymbol_special (int val, struct minimal_symbol *msym) |
| 233 | { |
| 234 | return; |
| 235 | } |
| 236 | |
| 237 | int |
| 238 | cannot_register_not (int regnum) |
| 239 | { |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | /* Legacy version of target_virtual_frame_pointer(). Assumes that |
| 244 | there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or |
| 245 | raw. */ |
| 246 | |
| 247 | void |
| 248 | legacy_virtual_frame_pointer (CORE_ADDR pc, |
| 249 | int *frame_regnum, |
| 250 | LONGEST *frame_offset) |
| 251 | { |
| 252 | /* FIXME: cagney/2002-09-13: This code is used when identifying the |
| 253 | frame pointer of the current PC. It is assuming that a single |
| 254 | register and an offset can determine this. I think it should |
| 255 | instead generate a byte code expression as that would work better |
| 256 | with things like Dwarf2's CFI. */ |
| 257 | if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS) |
| 258 | *frame_regnum = DEPRECATED_FP_REGNUM; |
| 259 | else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS) |
| 260 | *frame_regnum = SP_REGNUM; |
| 261 | else |
| 262 | /* Should this be an internal error? I guess so, it is reflecting |
| 263 | an architectural limitation in the current design. */ |
| 264 | internal_error (__FILE__, __LINE__, _("No virtual frame pointer available")); |
| 265 | *frame_offset = 0; |
| 266 | } |
| 267 | |
| 268 | /* Assume the world is sane, every register's virtual and real size |
| 269 | is identical. */ |
| 270 | |
| 271 | int |
| 272 | generic_register_size (int regnum) |
| 273 | { |
| 274 | gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS); |
| 275 | return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum)); |
| 276 | } |
| 277 | |
| 278 | /* Assume all registers are adjacent. */ |
| 279 | |
| 280 | int |
| 281 | generic_register_byte (int regnum) |
| 282 | { |
| 283 | int byte; |
| 284 | int i; |
| 285 | gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS); |
| 286 | byte = 0; |
| 287 | for (i = 0; i < regnum; i++) |
| 288 | { |
| 289 | byte += generic_register_size (i); |
| 290 | } |
| 291 | return byte; |
| 292 | } |
| 293 | |
| 294 | \f |
| 295 | int |
| 296 | legacy_pc_in_sigtramp (CORE_ADDR pc, char *name) |
| 297 | { |
| 298 | #if defined (DEPRECATED_IN_SIGTRAMP) |
| 299 | return DEPRECATED_IN_SIGTRAMP (pc, name); |
| 300 | #else |
| 301 | return name && strcmp ("_sigtramp", name) == 0; |
| 302 | #endif |
| 303 | } |
| 304 | |
| 305 | int |
| 306 | generic_convert_register_p (int regnum, struct type *type) |
| 307 | { |
| 308 | return 0; |
| 309 | } |
| 310 | |
| 311 | int |
| 312 | default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) |
| 313 | { |
| 314 | if (DEPRECATED_REG_STRUCT_HAS_ADDR_P () |
| 315 | && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type)) |
| 316 | { |
| 317 | CHECK_TYPEDEF (type); |
| 318 | |
| 319 | return (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 320 | || TYPE_CODE (type) == TYPE_CODE_UNION |
| 321 | || TYPE_CODE (type) == TYPE_CODE_SET |
| 322 | || TYPE_CODE (type) == TYPE_CODE_BITSTRING); |
| 323 | } |
| 324 | |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | int |
| 329 | generic_instruction_nullified (struct gdbarch *gdbarch, |
| 330 | struct regcache *regcache) |
| 331 | { |
| 332 | return 0; |
| 333 | } |
| 334 | |
| 335 | \f |
| 336 | /* Functions to manipulate the endianness of the target. */ |
| 337 | |
| 338 | /* ``target_byte_order'' is only used when non- multi-arch. |
| 339 | Multi-arch targets obtain the current byte order using the |
| 340 | TARGET_BYTE_ORDER gdbarch method. |
| 341 | |
| 342 | The choice of initial value is entirely arbitrary. During startup, |
| 343 | the function initialize_current_architecture() updates this value |
| 344 | based on default byte-order information extracted from BFD. */ |
| 345 | static int target_byte_order = BFD_ENDIAN_BIG; |
| 346 | static int target_byte_order_auto = 1; |
| 347 | |
| 348 | enum bfd_endian |
| 349 | selected_byte_order (void) |
| 350 | { |
| 351 | if (target_byte_order_auto) |
| 352 | return BFD_ENDIAN_UNKNOWN; |
| 353 | else |
| 354 | return target_byte_order; |
| 355 | } |
| 356 | |
| 357 | static const char endian_big[] = "big"; |
| 358 | static const char endian_little[] = "little"; |
| 359 | static const char endian_auto[] = "auto"; |
| 360 | static const char *endian_enum[] = |
| 361 | { |
| 362 | endian_big, |
| 363 | endian_little, |
| 364 | endian_auto, |
| 365 | NULL, |
| 366 | }; |
| 367 | static const char *set_endian_string; |
| 368 | |
| 369 | /* Called by ``show endian''. */ |
| 370 | |
| 371 | static void |
| 372 | show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c, |
| 373 | const char *value) |
| 374 | { |
| 375 | if (target_byte_order_auto) |
| 376 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 377 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
| 378 | "(currently big endian)\n")); |
| 379 | else |
| 380 | fprintf_unfiltered (file, _("The target endianness is set automatically " |
| 381 | "(currently little endian)\n")); |
| 382 | else |
| 383 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 384 | fprintf_unfiltered (file, |
| 385 | _("The target is assumed to be big endian\n")); |
| 386 | else |
| 387 | fprintf_unfiltered (file, |
| 388 | _("The target is assumed to be little endian\n")); |
| 389 | } |
| 390 | |
| 391 | static void |
| 392 | set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c) |
| 393 | { |
| 394 | if (set_endian_string == endian_auto) |
| 395 | { |
| 396 | target_byte_order_auto = 1; |
| 397 | } |
| 398 | else if (set_endian_string == endian_little) |
| 399 | { |
| 400 | struct gdbarch_info info; |
| 401 | target_byte_order_auto = 0; |
| 402 | gdbarch_info_init (&info); |
| 403 | info.byte_order = BFD_ENDIAN_LITTLE; |
| 404 | if (! gdbarch_update_p (info)) |
| 405 | printf_unfiltered (_("Little endian target not supported by GDB\n")); |
| 406 | } |
| 407 | else if (set_endian_string == endian_big) |
| 408 | { |
| 409 | struct gdbarch_info info; |
| 410 | target_byte_order_auto = 0; |
| 411 | gdbarch_info_init (&info); |
| 412 | info.byte_order = BFD_ENDIAN_BIG; |
| 413 | if (! gdbarch_update_p (info)) |
| 414 | printf_unfiltered (_("Big endian target not supported by GDB\n")); |
| 415 | } |
| 416 | else |
| 417 | internal_error (__FILE__, __LINE__, |
| 418 | _("set_endian: bad value")); |
| 419 | show_endian (gdb_stdout, from_tty, NULL, NULL); |
| 420 | } |
| 421 | |
| 422 | /* Functions to manipulate the architecture of the target */ |
| 423 | |
| 424 | enum set_arch { set_arch_auto, set_arch_manual }; |
| 425 | |
| 426 | static int target_architecture_auto = 1; |
| 427 | |
| 428 | static const char *set_architecture_string; |
| 429 | |
| 430 | const char * |
| 431 | selected_architecture_name (void) |
| 432 | { |
| 433 | if (target_architecture_auto) |
| 434 | return NULL; |
| 435 | else |
| 436 | return set_architecture_string; |
| 437 | } |
| 438 | |
| 439 | /* Called if the user enters ``show architecture'' without an |
| 440 | argument. */ |
| 441 | |
| 442 | static void |
| 443 | show_architecture (struct ui_file *file, int from_tty, |
| 444 | struct cmd_list_element *c, const char *value) |
| 445 | { |
| 446 | const char *arch; |
| 447 | arch = TARGET_ARCHITECTURE->printable_name; |
| 448 | if (target_architecture_auto) |
| 449 | fprintf_filtered (file, _("\ |
| 450 | The target architecture is set automatically (currently %s)\n"), arch); |
| 451 | else |
| 452 | fprintf_filtered (file, _("\ |
| 453 | The target architecture is assumed to be %s\n"), arch); |
| 454 | } |
| 455 | |
| 456 | |
| 457 | /* Called if the user enters ``set architecture'' with or without an |
| 458 | argument. */ |
| 459 | |
| 460 | static void |
| 461 | set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c) |
| 462 | { |
| 463 | if (strcmp (set_architecture_string, "auto") == 0) |
| 464 | { |
| 465 | target_architecture_auto = 1; |
| 466 | } |
| 467 | else |
| 468 | { |
| 469 | struct gdbarch_info info; |
| 470 | gdbarch_info_init (&info); |
| 471 | info.bfd_arch_info = bfd_scan_arch (set_architecture_string); |
| 472 | if (info.bfd_arch_info == NULL) |
| 473 | internal_error (__FILE__, __LINE__, |
| 474 | _("set_architecture: bfd_scan_arch failed")); |
| 475 | if (gdbarch_update_p (info)) |
| 476 | target_architecture_auto = 0; |
| 477 | else |
| 478 | printf_unfiltered (_("Architecture `%s' not recognized.\n"), |
| 479 | set_architecture_string); |
| 480 | } |
| 481 | show_architecture (gdb_stdout, from_tty, NULL, NULL); |
| 482 | } |
| 483 | |
| 484 | /* Try to select a global architecture that matches "info". Return |
| 485 | non-zero if the attempt succeds. */ |
| 486 | int |
| 487 | gdbarch_update_p (struct gdbarch_info info) |
| 488 | { |
| 489 | struct gdbarch *new_gdbarch = gdbarch_find_by_info (info); |
| 490 | |
| 491 | /* If there no architecture by that name, reject the request. */ |
| 492 | if (new_gdbarch == NULL) |
| 493 | { |
| 494 | if (gdbarch_debug) |
| 495 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " |
| 496 | "Architecture not found\n"); |
| 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | /* If it is the same old architecture, accept the request (but don't |
| 501 | swap anything). */ |
| 502 | if (new_gdbarch == current_gdbarch) |
| 503 | { |
| 504 | if (gdbarch_debug) |
| 505 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " |
| 506 | "Architecture 0x%08lx (%s) unchanged\n", |
| 507 | (long) new_gdbarch, |
| 508 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); |
| 509 | return 1; |
| 510 | } |
| 511 | |
| 512 | /* It's a new architecture, swap it in. */ |
| 513 | if (gdbarch_debug) |
| 514 | fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " |
| 515 | "New architecture 0x%08lx (%s) selected\n", |
| 516 | (long) new_gdbarch, |
| 517 | gdbarch_bfd_arch_info (new_gdbarch)->printable_name); |
| 518 | deprecated_current_gdbarch_select_hack (new_gdbarch); |
| 519 | |
| 520 | return 1; |
| 521 | } |
| 522 | |
| 523 | /* Return the architecture for ABFD. If no suitable architecture |
| 524 | could be find, return NULL. */ |
| 525 | |
| 526 | struct gdbarch * |
| 527 | gdbarch_from_bfd (bfd *abfd) |
| 528 | { |
| 529 | struct gdbarch *old_gdbarch = current_gdbarch; |
| 530 | struct gdbarch *new_gdbarch; |
| 531 | struct gdbarch_info info; |
| 532 | |
| 533 | gdbarch_info_init (&info); |
| 534 | info.abfd = abfd; |
| 535 | return gdbarch_find_by_info (info); |
| 536 | } |
| 537 | |
| 538 | /* Set the dynamic target-system-dependent parameters (architecture, |
| 539 | byte-order) using information found in the BFD */ |
| 540 | |
| 541 | void |
| 542 | set_gdbarch_from_file (bfd *abfd) |
| 543 | { |
| 544 | struct gdbarch *gdbarch; |
| 545 | |
| 546 | gdbarch = gdbarch_from_bfd (abfd); |
| 547 | if (gdbarch == NULL) |
| 548 | error (_("Architecture of file not recognized.")); |
| 549 | deprecated_current_gdbarch_select_hack (gdbarch); |
| 550 | } |
| 551 | |
| 552 | /* Initialize the current architecture. Update the ``set |
| 553 | architecture'' command so that it specifies a list of valid |
| 554 | architectures. */ |
| 555 | |
| 556 | #ifdef DEFAULT_BFD_ARCH |
| 557 | extern const bfd_arch_info_type DEFAULT_BFD_ARCH; |
| 558 | static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH; |
| 559 | #else |
| 560 | static const bfd_arch_info_type *default_bfd_arch; |
| 561 | #endif |
| 562 | |
| 563 | #ifdef DEFAULT_BFD_VEC |
| 564 | extern const bfd_target DEFAULT_BFD_VEC; |
| 565 | static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC; |
| 566 | #else |
| 567 | static const bfd_target *default_bfd_vec; |
| 568 | #endif |
| 569 | |
| 570 | void |
| 571 | initialize_current_architecture (void) |
| 572 | { |
| 573 | const char **arches = gdbarch_printable_names (); |
| 574 | |
| 575 | /* determine a default architecture and byte order. */ |
| 576 | struct gdbarch_info info; |
| 577 | gdbarch_info_init (&info); |
| 578 | |
| 579 | /* Find a default architecture. */ |
| 580 | if (info.bfd_arch_info == NULL |
| 581 | && default_bfd_arch != NULL) |
| 582 | info.bfd_arch_info = default_bfd_arch; |
| 583 | if (info.bfd_arch_info == NULL) |
| 584 | { |
| 585 | /* Choose the architecture by taking the first one |
| 586 | alphabetically. */ |
| 587 | const char *chosen = arches[0]; |
| 588 | const char **arch; |
| 589 | for (arch = arches; *arch != NULL; arch++) |
| 590 | { |
| 591 | if (strcmp (*arch, chosen) < 0) |
| 592 | chosen = *arch; |
| 593 | } |
| 594 | if (chosen == NULL) |
| 595 | internal_error (__FILE__, __LINE__, |
| 596 | _("initialize_current_architecture: No arch")); |
| 597 | info.bfd_arch_info = bfd_scan_arch (chosen); |
| 598 | if (info.bfd_arch_info == NULL) |
| 599 | internal_error (__FILE__, __LINE__, |
| 600 | _("initialize_current_architecture: Arch not found")); |
| 601 | } |
| 602 | |
| 603 | /* Take several guesses at a byte order. */ |
| 604 | if (info.byte_order == BFD_ENDIAN_UNKNOWN |
| 605 | && default_bfd_vec != NULL) |
| 606 | { |
| 607 | /* Extract BFD's default vector's byte order. */ |
| 608 | switch (default_bfd_vec->byteorder) |
| 609 | { |
| 610 | case BFD_ENDIAN_BIG: |
| 611 | info.byte_order = BFD_ENDIAN_BIG; |
| 612 | break; |
| 613 | case BFD_ENDIAN_LITTLE: |
| 614 | info.byte_order = BFD_ENDIAN_LITTLE; |
| 615 | break; |
| 616 | default: |
| 617 | break; |
| 618 | } |
| 619 | } |
| 620 | if (info.byte_order == BFD_ENDIAN_UNKNOWN) |
| 621 | { |
| 622 | /* look for ``*el-*'' in the target name. */ |
| 623 | const char *chp; |
| 624 | chp = strchr (target_name, '-'); |
| 625 | if (chp != NULL |
| 626 | && chp - 2 >= target_name |
| 627 | && strncmp (chp - 2, "el", 2) == 0) |
| 628 | info.byte_order = BFD_ENDIAN_LITTLE; |
| 629 | } |
| 630 | if (info.byte_order == BFD_ENDIAN_UNKNOWN) |
| 631 | { |
| 632 | /* Wire it to big-endian!!! */ |
| 633 | info.byte_order = BFD_ENDIAN_BIG; |
| 634 | } |
| 635 | |
| 636 | if (! gdbarch_update_p (info)) |
| 637 | internal_error (__FILE__, __LINE__, |
| 638 | _("initialize_current_architecture: Selection of " |
| 639 | "initial architecture failed")); |
| 640 | |
| 641 | /* Create the ``set architecture'' command appending ``auto'' to the |
| 642 | list of architectures. */ |
| 643 | { |
| 644 | struct cmd_list_element *c; |
| 645 | /* Append ``auto''. */ |
| 646 | int nr; |
| 647 | for (nr = 0; arches[nr] != NULL; nr++); |
| 648 | arches = xrealloc (arches, sizeof (char*) * (nr + 2)); |
| 649 | arches[nr + 0] = "auto"; |
| 650 | arches[nr + 1] = NULL; |
| 651 | add_setshow_enum_cmd ("architecture", class_support, |
| 652 | arches, &set_architecture_string, _("\ |
| 653 | Set architecture of target."), _("\ |
| 654 | Show architecture of target."), NULL, |
| 655 | set_architecture, show_architecture, |
| 656 | &setlist, &showlist); |
| 657 | add_alias_cmd ("processor", "architecture", class_support, 1, &setlist); |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | |
| 662 | /* Initialize a gdbarch info to values that will be automatically |
| 663 | overridden. Note: Originally, this ``struct info'' was initialized |
| 664 | using memset(0). Unfortunately, that ran into problems, namely |
| 665 | BFD_ENDIAN_BIG is zero. An explicit initialization function that |
| 666 | can explicitly set each field to a well defined value is used. */ |
| 667 | |
| 668 | void |
| 669 | gdbarch_info_init (struct gdbarch_info *info) |
| 670 | { |
| 671 | memset (info, 0, sizeof (struct gdbarch_info)); |
| 672 | info->byte_order = BFD_ENDIAN_UNKNOWN; |
| 673 | info->osabi = GDB_OSABI_UNINITIALIZED; |
| 674 | } |
| 675 | |
| 676 | /* Similar to init, but this time fill in the blanks. Information is |
| 677 | obtained from the specified architecture, global "set ..." options, |
| 678 | and explicitly initialized INFO fields. */ |
| 679 | |
| 680 | void |
| 681 | gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info) |
| 682 | { |
| 683 | /* "(gdb) set architecture ...". */ |
| 684 | if (info->bfd_arch_info == NULL |
| 685 | && !target_architecture_auto |
| 686 | && gdbarch != NULL) |
| 687 | info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch); |
| 688 | if (info->bfd_arch_info == NULL |
| 689 | && info->abfd != NULL |
| 690 | && bfd_get_arch (info->abfd) != bfd_arch_unknown |
| 691 | && bfd_get_arch (info->abfd) != bfd_arch_obscure) |
| 692 | info->bfd_arch_info = bfd_get_arch_info (info->abfd); |
| 693 | if (info->bfd_arch_info == NULL |
| 694 | && gdbarch != NULL) |
| 695 | info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch); |
| 696 | |
| 697 | /* "(gdb) set byte-order ...". */ |
| 698 | if (info->byte_order == BFD_ENDIAN_UNKNOWN |
| 699 | && !target_byte_order_auto |
| 700 | && gdbarch != NULL) |
| 701 | info->byte_order = gdbarch_byte_order (gdbarch); |
| 702 | /* From the INFO struct. */ |
| 703 | if (info->byte_order == BFD_ENDIAN_UNKNOWN |
| 704 | && info->abfd != NULL) |
| 705 | info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG |
| 706 | : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE |
| 707 | : BFD_ENDIAN_UNKNOWN); |
| 708 | /* From the current target. */ |
| 709 | if (info->byte_order == BFD_ENDIAN_UNKNOWN |
| 710 | && gdbarch != NULL) |
| 711 | info->byte_order = gdbarch_byte_order (gdbarch); |
| 712 | |
| 713 | /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */ |
| 714 | if (info->osabi == GDB_OSABI_UNINITIALIZED) |
| 715 | info->osabi = gdbarch_lookup_osabi (info->abfd); |
| 716 | if (info->osabi == GDB_OSABI_UNINITIALIZED |
| 717 | && gdbarch != NULL) |
| 718 | info->osabi = gdbarch_osabi (gdbarch); |
| 719 | |
| 720 | /* Must have at least filled in the architecture. */ |
| 721 | gdb_assert (info->bfd_arch_info != NULL); |
| 722 | } |
| 723 | |
| 724 | /* */ |
| 725 | |
| 726 | extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */ |
| 727 | |
| 728 | void |
| 729 | _initialize_gdbarch_utils (void) |
| 730 | { |
| 731 | struct cmd_list_element *c; |
| 732 | add_setshow_enum_cmd ("endian", class_support, |
| 733 | endian_enum, &set_endian_string, _("\ |
| 734 | Set endianness of target."), _("\ |
| 735 | Show endianness of target."), NULL, |
| 736 | set_endian, show_endian, |
| 737 | &setlist, &showlist); |
| 738 | } |