gdb/arch-utils.c

   1 /* Dynamic architecture support for GDB, the GNU debugger.
   2    Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22
  23 #if GDB_MULTI_ARCH
  24 #include "gdbcmd.h"
  25 #include "inferior.h"           /* enum CALL_DUMMY_LOCATION et.al. */
  26 #else
  27 /* Just include everything in sight so that the every old definition
  28    of macro is visible. */
  29 #include "gdb_string.h"
  30 #include "symtab.h"
  31 #include "frame.h"
  32 #include "inferior.h"
  33 #include "breakpoint.h"
  34 #include "gdb_wait.h"
  35 #include "gdbcore.h"
  36 #include "gdbcmd.h"
  37 #include "target.h"
  38 #include "annotate.h"
  39 #endif
  40 #include "regcache.h"
  41 #include "gdb_assert.h"
  42
  43 #include "version.h"
  44
  45 #include "floatformat.h"
  46
  47 /* Use the program counter to determine the contents and size
  48    of a breakpoint instruction.  If no target-dependent macro
  49    BREAKPOINT_FROM_PC has been defined to implement this function,
  50    assume that the breakpoint doesn't depend on the PC, and
  51    use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
  52    Return a pointer to a string of bytes that encode a breakpoint
  53    instruction, stores the length of the string to *lenptr,
  54    and optionally adjust the pc to point to the correct memory location
  55    for inserting the breakpoint.  */
  56
  57 unsigned char *
  58 legacy_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr)
  59 {
  60   /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
  61      breakpoint.  On some machines, breakpoints are handled by the
  62      target environment and we don't have to worry about them here.  */
  63 #ifdef BIG_BREAKPOINT
  64   if (TARGET_BYTE_ORDER == BIG_ENDIAN)
  65     {
  66       static unsigned char big_break_insn[] = BIG_BREAKPOINT;
  67       *lenptr = sizeof (big_break_insn);
  68       return big_break_insn;
  69     }
  70 #endif
  71 #ifdef LITTLE_BREAKPOINT
  72   if (TARGET_BYTE_ORDER != BIG_ENDIAN)
  73     {
  74       static unsigned char little_break_insn[] = LITTLE_BREAKPOINT;
  75       *lenptr = sizeof (little_break_insn);
  76       return little_break_insn;
  77     }
  78 #endif
  79 #ifdef BREAKPOINT
  80   {
  81     static unsigned char break_insn[] = BREAKPOINT;
  82     *lenptr = sizeof (break_insn);
  83     return break_insn;
  84   }
  85 #endif
  86   *lenptr = 0;
  87   return NULL;
  88 }
  89
  90 int
  91 generic_frameless_function_invocation_not (struct frame_info *fi)
  92 {
  93   return 0;
  94 }
  95
  96 int
  97 generic_return_value_on_stack_not (struct type *type)
  98 {
  99   return 0;
 100 }
 101
 102 CORE_ADDR
 103 generic_skip_trampoline_code (CORE_ADDR pc)
 104 {
 105   return 0;
 106 }
 107
 108 char *
 109 legacy_register_name (int i)
 110 {
 111 #ifdef REGISTER_NAMES
 112   static char *names[] = REGISTER_NAMES;
 113   if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
 114     return NULL;
 115   else
 116     return names[i];
 117 #else
 118   internal_error (__FILE__, __LINE__,
 119                   "legacy_register_name: called.");
 120   return NULL;
 121 #endif
 122 }
 123
 124 #if defined (CALL_DUMMY)
 125 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
 126 #else
 127 LONGEST legacy_call_dummy_words[1];
 128 #endif
 129 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
 130
 131 void
 132 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len,
 133                                        CORE_ADDR * rem_addr, int *rem_len)
 134 {
 135   *rem_addr = gdb_addr;
 136   *rem_len = gdb_len;
 137 }
 138
 139 int
 140 generic_prologue_frameless_p (CORE_ADDR ip)
 141 {
 142 #ifdef SKIP_PROLOGUE_FRAMELESS_P
 143   return ip == SKIP_PROLOGUE_FRAMELESS_P (ip);
 144 #else
 145   return ip == SKIP_PROLOGUE (ip);
 146 #endif
 147 }
 148
 149
 150 /* Helper functions for INNER_THAN */
 151
 152 int
 153 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 154 {
 155   return (lhs < rhs);
 156 }
 157
 158 int
 159 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 160 {
 161   return (lhs > rhs);
 162 }
 163
 164
 165 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 166
 167 const struct floatformat *
 168 default_float_format (struct gdbarch *gdbarch)
 169 {
 170 #if GDB_MULTI_ARCH
 171   int byte_order = gdbarch_byte_order (gdbarch);
 172 #else
 173   int byte_order = TARGET_BYTE_ORDER;
 174 #endif
 175   switch (byte_order)
 176     {
 177     case BIG_ENDIAN:
 178       return &floatformat_ieee_single_big;
 179     case LITTLE_ENDIAN:
 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 #if GDB_MULTI_ARCH
 192   int byte_order = gdbarch_byte_order (gdbarch);
 193 #else
 194   int byte_order = TARGET_BYTE_ORDER;
 195 #endif
 196   switch (byte_order)
 197     {
 198     case BIG_ENDIAN:
 199       return &floatformat_ieee_double_big;
 200     case LITTLE_ENDIAN:
 201       return &floatformat_ieee_double_little;
 202     default:
 203       internal_error (__FILE__, __LINE__,
 204                       "default_double_format: bad byte order");
 205     }
 206 }
 207
 208 /* Misc helper functions for targets. */
 209
 210 int
 211 frame_num_args_unknown (struct frame_info *fi)
 212 {
 213   return -1;
 214 }
 215
 216
 217 int
 218 generic_register_convertible_not (int num)
 219 {
 220   return 0;
 221 }
 222
 223
 224 int
 225 default_register_sim_regno (int num)
 226 {
 227   return num;
 228 }
 229
 230
 231 CORE_ADDR
 232 core_addr_identity (CORE_ADDR addr)
 233 {
 234   return addr;
 235 }
 236
 237 int
 238 no_op_reg_to_regnum (int reg)
 239 {
 240   return reg;
 241 }
 242
 243 /* For use by frame_args_address and frame_locals_address.  */
 244 CORE_ADDR
 245 default_frame_address (struct frame_info *fi)
 246 {
 247   return fi->frame;
 248 }
 249
 250 /* Default prepare_to_procced().  */
 251 int
 252 default_prepare_to_proceed (int select_it)
 253 {
 254   return 0;
 255 }
 256
 257 /* Generic prepare_to_proceed().  This one should be suitable for most
 258    targets that support threads. */
 259 int
 260 generic_prepare_to_proceed (int select_it)
 261 {
 262   ptid_t wait_ptid;
 263   struct target_waitstatus wait_status;
 264
 265   /* Get the last target status returned by target_wait().  */
 266   get_last_target_status (&wait_ptid, &wait_status);
 267
 268   /* Make sure we were stopped either at a breakpoint, or because
 269      of a Ctrl-C.  */
 270   if (wait_status.kind != TARGET_WAITKIND_STOPPED
 271       || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
 272           wait_status.value.sig != TARGET_SIGNAL_INT))
 273     {
 274       return 0;
 275     }
 276
 277   if (!ptid_equal (wait_ptid, minus_one_ptid)
 278       && !ptid_equal (inferior_ptid, wait_ptid))
 279     {
 280       /* Switched over from WAIT_PID.  */
 281       CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
 282
 283       if (wait_pc != read_pc ())
 284         {
 285           if (select_it)
 286             {
 287               /* Switch back to WAIT_PID thread.  */
 288               inferior_ptid = wait_ptid;
 289
 290               /* FIXME: This stuff came from switch_to_thread() in
 291                  thread.c (which should probably be a public function).  */
 292               flush_cached_frames ();
 293               registers_changed ();
 294               stop_pc = wait_pc;
 295               select_frame (get_current_frame (), 0);
 296             }
 297           /* We return 1 to indicate that there is a breakpoint here,
 298              so we need to step over it before continuing to avoid
 299              hitting it straight away. */
 300           if (breakpoint_here_p (wait_pc))
 301             {
 302               return 1;
 303             }
 304         }
 305     }
 306   return 0;
 307
 308 }
 309
 310 void
 311 init_frame_pc_noop (int fromleaf, struct frame_info *prev)
 312 {
 313   return;
 314 }
 315
 316 void
 317 init_frame_pc_default (int fromleaf, struct frame_info *prev)
 318 {
 319   if (fromleaf)
 320     prev->pc = SAVED_PC_AFTER_CALL (prev->next);
 321   else if (prev->next != NULL)
 322     prev->pc = FRAME_SAVED_PC (prev->next);
 323   else
 324     prev->pc = read_pc ();
 325 }
 326
 327 int
 328 cannot_register_not (int regnum)
 329 {
 330   return 0;
 331 }
 332
 333 /* Legacy version of target_virtual_frame_pointer().  Assumes that
 334    there is an FP_REGNUM and that it is the same, cooked or raw.  */
 335
 336 void
 337 legacy_virtual_frame_pointer (CORE_ADDR pc,
 338                               int *frame_regnum,
 339                               LONGEST *frame_offset)
 340 {
 341   gdb_assert (FP_REGNUM >= 0);
 342   *frame_regnum = FP_REGNUM;
 343   *frame_offset = 0;
 344 }
 345 \f
 346 /* Functions to manipulate the endianness of the target.  */
 347
 348 #ifdef TARGET_BYTE_ORDER_SELECTABLE
 349 /* compat - Catch old targets that expect a selectable byte-order to
 350    default to BIG_ENDIAN */
 351 #ifndef TARGET_BYTE_ORDER_DEFAULT
 352 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
 353 #endif
 354 #endif
 355 #if !TARGET_BYTE_ORDER_SELECTABLE_P
 356 #ifndef TARGET_BYTE_ORDER_DEFAULT
 357 /* compat - Catch old non byte-order selectable targets that do not
 358    define TARGET_BYTE_ORDER_DEFAULT and instead expect
 359    TARGET_BYTE_ORDER to be used as the default.  For targets that
 360    defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
 361    below will get a strange compiler warning. */
 362 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
 363 #endif
 364 #endif
 365 #ifndef TARGET_BYTE_ORDER_DEFAULT
 366 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
 367 #endif
 368 /* ``target_byte_order'' is only used when non- multi-arch.
 369    Multi-arch targets obtain the current byte order using
 370    TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
 371 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
 372 int target_byte_order_auto = 1;
 373
 374 static const char endian_big[] = "big";
 375 static const char endian_little[] = "little";
 376 static const char endian_auto[] = "auto";
 377 static const char *endian_enum[] =
 378 {
 379   endian_big,
 380   endian_little,
 381   endian_auto,
 382   NULL,
 383 };
 384 static const char *set_endian_string;
 385
 386 /* Called by ``show endian''.  */
 387
 388 static void
 389 show_endian (char *args, int from_tty)
 390 {
 391   if (TARGET_BYTE_ORDER_AUTO)
 392     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 393                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 394   else
 395     printf_unfiltered ("The target is assumed to be %s endian\n",
 396                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 397 }
 398
 399 static void
 400 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 401 {
 402   if (!TARGET_BYTE_ORDER_SELECTABLE_P)
 403     {
 404       printf_unfiltered ("Byte order is not selectable.");
 405     }
 406   else if (set_endian_string == endian_auto)
 407     {
 408       target_byte_order_auto = 1;
 409     }
 410   else if (set_endian_string == endian_little)
 411     {
 412       target_byte_order_auto = 0;
 413       if (GDB_MULTI_ARCH)
 414         {
 415           struct gdbarch_info info;
 416           memset (&info, 0, sizeof info);
 417           info.byte_order = LITTLE_ENDIAN;
 418           if (! gdbarch_update_p (info))
 419             {
 420               printf_unfiltered ("Little endian target not supported by GDB\n");
 421             }
 422         }
 423       else
 424         {
 425           target_byte_order = LITTLE_ENDIAN;
 426         }
 427     }
 428   else if (set_endian_string == endian_big)
 429     {
 430       target_byte_order_auto = 0;
 431       if (GDB_MULTI_ARCH)
 432         {
 433           struct gdbarch_info info;
 434           memset (&info, 0, sizeof info);
 435           info.byte_order = BIG_ENDIAN;
 436           if (! gdbarch_update_p (info))
 437             {
 438               printf_unfiltered ("Big endian target not supported by GDB\n");
 439             }
 440         }
 441       else
 442         {
 443           target_byte_order = BIG_ENDIAN;
 444         }
 445     }
 446   else
 447     internal_error (__FILE__, __LINE__,
 448                     "set_endian: bad value");
 449   show_endian (NULL, from_tty);
 450 }
 451
 452 /* Set the endianness from a BFD.  */
 453
 454 static void
 455 set_endian_from_file (bfd *abfd)
 456 {
 457   if (GDB_MULTI_ARCH)
 458     internal_error (__FILE__, __LINE__,
 459                     "set_endian_from_file: not for multi-arch");
 460   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 461     {
 462       int want;
 463
 464       if (bfd_big_endian (abfd))
 465         want = BIG_ENDIAN;
 466       else
 467         want = LITTLE_ENDIAN;
 468       if (TARGET_BYTE_ORDER_AUTO)
 469         target_byte_order = want;
 470       else if (TARGET_BYTE_ORDER != want)
 471         warning ("%s endian file does not match %s endian target.",
 472                  want == BIG_ENDIAN ? "big" : "little",
 473                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 474     }
 475   else
 476     {
 477       if (bfd_big_endian (abfd)
 478           ? TARGET_BYTE_ORDER != BIG_ENDIAN
 479           : TARGET_BYTE_ORDER == BIG_ENDIAN)
 480         warning ("%s endian file does not match %s endian target.",
 481                  bfd_big_endian (abfd) ? "big" : "little",
 482                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 483     }
 484 }
 485
 486
 487 /* Functions to manipulate the architecture of the target */
 488
 489 enum set_arch { set_arch_auto, set_arch_manual };
 490
 491 int target_architecture_auto = 1;
 492
 493 const char *set_architecture_string;
 494
 495 /* Old way of changing the current architecture. */
 496
 497 extern const struct bfd_arch_info bfd_default_arch_struct;
 498 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 499 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 500
 501 static int
 502 arch_ok (const struct bfd_arch_info *arch)
 503 {
 504   if (GDB_MULTI_ARCH)
 505     internal_error (__FILE__, __LINE__,
 506                     "arch_ok: not multi-arched");
 507   /* Should be performing the more basic check that the binary is
 508      compatible with GDB. */
 509   /* Check with the target that the architecture is valid. */
 510   return (target_architecture_hook == NULL
 511           || target_architecture_hook (arch));
 512 }
 513
 514 static void
 515 set_arch (const struct bfd_arch_info *arch,
 516           enum set_arch type)
 517 {
 518   if (GDB_MULTI_ARCH)
 519     internal_error (__FILE__, __LINE__,
 520                     "set_arch: not multi-arched");
 521   switch (type)
 522     {
 523     case set_arch_auto:
 524       if (!arch_ok (arch))
 525         warning ("Target may not support %s architecture",
 526                  arch->printable_name);
 527       target_architecture = arch;
 528       break;
 529     case set_arch_manual:
 530       if (!arch_ok (arch))
 531         {
 532           printf_unfiltered ("Target does not support `%s' architecture.\n",
 533                              arch->printable_name);
 534         }
 535       else
 536         {
 537           target_architecture_auto = 0;
 538           target_architecture = arch;
 539         }
 540       break;
 541     }
 542   if (gdbarch_debug)
 543     gdbarch_dump (current_gdbarch, gdb_stdlog);
 544 }
 545
 546 /* Set the architecture from arch/machine (deprecated) */
 547
 548 void
 549 set_architecture_from_arch_mach (enum bfd_architecture arch,
 550                                  unsigned long mach)
 551 {
 552   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 553   if (GDB_MULTI_ARCH)
 554     internal_error (__FILE__, __LINE__,
 555                     "set_architecture_from_arch_mach: not multi-arched");
 556   if (wanted != NULL)
 557     set_arch (wanted, set_arch_manual);
 558   else
 559     internal_error (__FILE__, __LINE__,
 560                     "gdbarch: hardwired architecture/machine not recognized");
 561 }
 562
 563 /* Set the architecture from a BFD (deprecated) */
 564
 565 static void
 566 set_architecture_from_file (bfd *abfd)
 567 {
 568   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 569   if (GDB_MULTI_ARCH)
 570     internal_error (__FILE__, __LINE__,
 571                     "set_architecture_from_file: not multi-arched");
 572   if (target_architecture_auto)
 573     {
 574       set_arch (wanted, set_arch_auto);
 575     }
 576   else if (wanted != target_architecture)
 577     {
 578       warning ("%s architecture file may be incompatible with %s target.",
 579                wanted->printable_name,
 580                target_architecture->printable_name);
 581     }
 582 }
 583
 584
 585 /* Called if the user enters ``show architecture'' without an
 586    argument. */
 587
 588 static void
 589 show_architecture (char *args, int from_tty)
 590 {
 591   const char *arch;
 592   arch = TARGET_ARCHITECTURE->printable_name;
 593   if (target_architecture_auto)
 594     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 595   else
 596     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 597 }
 598
 599
 600 /* Called if the user enters ``set architecture'' with or without an
 601    argument. */
 602
 603 static void
 604 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 605 {
 606   if (strcmp (set_architecture_string, "auto") == 0)
 607     {
 608       target_architecture_auto = 1;
 609     }
 610   else if (GDB_MULTI_ARCH)
 611     {
 612       struct gdbarch_info info;
 613       memset (&info, 0, sizeof info);
 614       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 615       if (info.bfd_arch_info == NULL)
 616         internal_error (__FILE__, __LINE__,
 617                         "set_architecture: bfd_scan_arch failed");
 618       if (gdbarch_update_p (info))
 619         target_architecture_auto = 0;
 620       else
 621         printf_unfiltered ("Architecture `%s' not recognized.\n",
 622                            set_architecture_string);
 623     }
 624   else
 625     {
 626       const struct bfd_arch_info *arch
 627         = bfd_scan_arch (set_architecture_string);
 628       if (arch == NULL)
 629         internal_error (__FILE__, __LINE__,
 630                         "set_architecture: bfd_scan_arch failed");
 631       set_arch (arch, set_arch_manual);
 632     }
 633   show_architecture (NULL, from_tty);
 634 }
 635
 636 /* Set the dynamic target-system-dependent parameters (architecture,
 637    byte-order) using information found in the BFD */
 638
 639 void
 640 set_gdbarch_from_file (bfd *abfd)
 641 {
 642   if (GDB_MULTI_ARCH)
 643     {
 644       struct gdbarch_info info;
 645       memset (&info, 0, sizeof info);
 646       info.abfd = abfd;
 647       if (! gdbarch_update_p (info))
 648         error ("Architecture of file not recognized.\n");
 649     }
 650   else
 651     {
 652       set_architecture_from_file (abfd);
 653       set_endian_from_file (abfd);
 654     }
 655 }
 656
 657 /* Initialize the current architecture.  Update the ``set
 658    architecture'' command so that it specifies a list of valid
 659    architectures.  */
 660
 661 #ifdef DEFAULT_BFD_ARCH
 662 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 663 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 664 #else
 665 static const bfd_arch_info_type *default_bfd_arch;
 666 #endif
 667
 668 #ifdef DEFAULT_BFD_VEC
 669 extern const bfd_target DEFAULT_BFD_VEC;
 670 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 671 #else
 672 static const bfd_target *default_bfd_vec;
 673 #endif
 674
 675 void
 676 initialize_current_architecture (void)
 677 {
 678   const char **arches = gdbarch_printable_names ();
 679
 680   /* determine a default architecture and byte order. */
 681   struct gdbarch_info info;
 682   memset (&info, 0, sizeof (info));
 683
 684   /* Find a default architecture. */
 685   if (info.bfd_arch_info == NULL
 686       && default_bfd_arch != NULL)
 687     info.bfd_arch_info = default_bfd_arch;
 688   if (info.bfd_arch_info == NULL)
 689     {
 690       /* Choose the architecture by taking the first one
 691          alphabetically. */
 692       const char *chosen = arches[0];
 693       const char **arch;
 694       for (arch = arches; *arch != NULL; arch++)
 695         {
 696           if (strcmp (*arch, chosen) < 0)
 697             chosen = *arch;
 698         }
 699       if (chosen == NULL)
 700         internal_error (__FILE__, __LINE__,
 701                         "initialize_current_architecture: No arch");
 702       info.bfd_arch_info = bfd_scan_arch (chosen);
 703       if (info.bfd_arch_info == NULL)
 704         internal_error (__FILE__, __LINE__,
 705                         "initialize_current_architecture: Arch not found");
 706     }
 707
 708   /* take several guesses at a byte order. */
 709   /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
 710      forced above. */
 711   if (info.byte_order == 0
 712       && default_bfd_vec != NULL)
 713     {
 714       /* Extract BFD's default vector's byte order. */
 715       switch (default_bfd_vec->byteorder)
 716         {
 717         case BFD_ENDIAN_BIG:
 718           info.byte_order = BIG_ENDIAN;
 719           break;
 720         case BFD_ENDIAN_LITTLE:
 721           info.byte_order = LITTLE_ENDIAN;
 722           break;
 723         default:
 724           break;
 725         }
 726     }
 727   if (info.byte_order == 0)
 728     {
 729       /* look for ``*el-*'' in the target name. */
 730       const char *chp;
 731       chp = strchr (target_name, '-');
 732       if (chp != NULL
 733           && chp - 2 >= target_name
 734           && strncmp (chp - 2, "el", 2) == 0)
 735         info.byte_order = LITTLE_ENDIAN;
 736     }
 737   if (info.byte_order == 0)
 738     {
 739       /* Wire it to big-endian!!! */
 740       info.byte_order = BIG_ENDIAN;
 741     }
 742
 743   if (GDB_MULTI_ARCH)
 744     {
 745       if (! gdbarch_update_p (info))
 746         {
 747           internal_error (__FILE__, __LINE__,
 748                           "initialize_current_architecture: Selection of initial architecture failed");
 749         }
 750     }
 751   else
 752     initialize_non_multiarch ();
 753
 754   /* Create the ``set architecture'' command appending ``auto'' to the
 755      list of architectures. */
 756   {
 757     struct cmd_list_element *c;
 758     /* Append ``auto''. */
 759     int nr;
 760     for (nr = 0; arches[nr] != NULL; nr++);
 761     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 762     arches[nr + 0] = "auto";
 763     arches[nr + 1] = NULL;
 764     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 765        of ``const char *''.  We just happen to know that the casts are
 766        safe. */
 767     c = add_set_enum_cmd ("architecture", class_support,
 768                           arches, &set_architecture_string,
 769                           "Set architecture of target.",
 770                           &setlist);
 771     c->function.sfunc = set_architecture;
 772     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 773     /* Don't use set_from_show - need to print both auto/manual and
 774        current setting. */
 775     add_cmd ("architecture", class_support, show_architecture,
 776              "Show the current target architecture", &showlist);
 777   }
 778 }
 779
 780
 781 /* */
 782
 783 extern initialize_file_ftype _initialize_gdbarch_utils;
 784
 785 void
 786 _initialize_gdbarch_utils (void)
 787 {
 788   struct cmd_list_element *c;
 789   c = add_set_enum_cmd ("endian", class_support,
 790                         endian_enum, &set_endian_string,
 791                         "Set endianness of target.",
 792                         &setlist);
 793   c->function.sfunc = set_endian;
 794   /* Don't use set_from_show - need to print both auto/manual and
 795      current setting. */
 796   add_cmd ("endian", class_support, show_endian,
 797            "Show the current byte-order", &showlist);
 798 }