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
  42 #include "version.h"
  43
  44 #include "floatformat.h"
  45
  46 /* Use the program counter to determine the contents and size
  47    of a breakpoint instruction.  If no target-dependent macro
  48    BREAKPOINT_FROM_PC has been defined to implement this function,
  49    assume that the breakpoint doesn't depend on the PC, and
  50    use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
  51    Return a pointer to a string of bytes that encode a breakpoint
  52    instruction, stores the length of the string to *lenptr,
  53    and optionally adjust the pc to point to the correct memory location
  54    for inserting the breakpoint.  */
  55
  56 unsigned char *
  57 legacy_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr)
  58 {
  59   /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
  60      breakpoint.  On some machines, breakpoints are handled by the
  61      target environment and we don't have to worry about them here.  */
  62 #ifdef BIG_BREAKPOINT
  63   if (TARGET_BYTE_ORDER == BIG_ENDIAN)
  64     {
  65       static unsigned char big_break_insn[] = BIG_BREAKPOINT;
  66       *lenptr = sizeof (big_break_insn);
  67       return big_break_insn;
  68     }
  69 #endif
  70 #ifdef LITTLE_BREAKPOINT
  71   if (TARGET_BYTE_ORDER != BIG_ENDIAN)
  72     {
  73       static unsigned char little_break_insn[] = LITTLE_BREAKPOINT;
  74       *lenptr = sizeof (little_break_insn);
  75       return little_break_insn;
  76     }
  77 #endif
  78 #ifdef BREAKPOINT
  79   {
  80     static unsigned char break_insn[] = BREAKPOINT;
  81     *lenptr = sizeof (break_insn);
  82     return break_insn;
  83   }
  84 #endif
  85   *lenptr = 0;
  86   return NULL;
  87 }
  88
  89 int
  90 generic_frameless_function_invocation_not (struct frame_info *fi)
  91 {
  92   return 0;
  93 }
  94
  95 int
  96 generic_return_value_on_stack_not (struct type *type)
  97 {
  98   return 0;
  99 }
 100
 101 char *
 102 legacy_register_name (int i)
 103 {
 104 #ifdef REGISTER_NAMES
 105   static char *names[] = REGISTER_NAMES;
 106   if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
 107     return NULL;
 108   else
 109     return names[i];
 110 #else
 111   internal_error (__FILE__, __LINE__,
 112                   "legacy_register_name: called.");
 113   return NULL;
 114 #endif
 115 }
 116
 117 #if defined (CALL_DUMMY)
 118 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
 119 #else
 120 LONGEST legacy_call_dummy_words[1];
 121 #endif
 122 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
 123
 124 void
 125 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len,
 126                                        CORE_ADDR * rem_addr, int *rem_len)
 127 {
 128   *rem_addr = gdb_addr;
 129   *rem_len = gdb_len;
 130 }
 131
 132 int
 133 generic_prologue_frameless_p (CORE_ADDR ip)
 134 {
 135 #ifdef SKIP_PROLOGUE_FRAMELESS_P
 136   return ip == SKIP_PROLOGUE_FRAMELESS_P (ip);
 137 #else
 138   return ip == SKIP_PROLOGUE (ip);
 139 #endif
 140 }
 141
 142
 143 /* Helper functions for INNER_THAN */
 144
 145 int
 146 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 147 {
 148   return (lhs < rhs);
 149 }
 150
 151 int
 152 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 153 {
 154   return (lhs > rhs);
 155 }
 156
 157
 158 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 159
 160 const struct floatformat *
 161 default_float_format (struct gdbarch *gdbarch)
 162 {
 163 #if GDB_MULTI_ARCH
 164   int byte_order = gdbarch_byte_order (gdbarch);
 165 #else
 166   int byte_order = TARGET_BYTE_ORDER;
 167 #endif
 168   switch (byte_order)
 169     {
 170     case BIG_ENDIAN:
 171       return &floatformat_ieee_single_big;
 172     case LITTLE_ENDIAN:
 173       return &floatformat_ieee_single_little;
 174     default:
 175       internal_error (__FILE__, __LINE__,
 176                       "default_float_format: bad byte order");
 177     }
 178 }
 179
 180
 181 const struct floatformat *
 182 default_double_format (struct gdbarch *gdbarch)
 183 {
 184 #if GDB_MULTI_ARCH
 185   int byte_order = gdbarch_byte_order (gdbarch);
 186 #else
 187   int byte_order = TARGET_BYTE_ORDER;
 188 #endif
 189   switch (byte_order)
 190     {
 191     case BIG_ENDIAN:
 192       return &floatformat_ieee_double_big;
 193     case LITTLE_ENDIAN:
 194       return &floatformat_ieee_double_little;
 195     default:
 196       internal_error (__FILE__, __LINE__,
 197                       "default_double_format: bad byte order");
 198     }
 199 }
 200
 201 /* Misc helper functions for targets. */
 202
 203 int
 204 frame_num_args_unknown (struct frame_info *fi)
 205 {
 206   return -1;
 207 }
 208
 209
 210 int
 211 generic_register_convertible_not (int num)
 212 {
 213   return 0;
 214 }
 215
 216
 217 int
 218 default_register_sim_regno (int num)
 219 {
 220   return num;
 221 }
 222
 223
 224 CORE_ADDR
 225 core_addr_identity (CORE_ADDR addr)
 226 {
 227   return addr;
 228 }
 229
 230 int
 231 no_op_reg_to_regnum (int reg)
 232 {
 233   return reg;
 234 }
 235
 236 /* For use by frame_args_address and frame_locals_address.  */
 237 CORE_ADDR
 238 default_frame_address (struct frame_info *fi)
 239 {
 240   return fi->frame;
 241 }
 242
 243 /* Default prepare_to_procced().  */
 244 int
 245 default_prepare_to_proceed (int select_it)
 246 {
 247   return 0;
 248 }
 249
 250 /* Generic prepare_to_proceed().  This one should be suitable for most
 251    targets that support threads. */
 252 int
 253 generic_prepare_to_proceed (int select_it)
 254 {
 255   ptid_t wait_ptid;
 256   struct target_waitstatus wait_status;
 257
 258   /* Get the last target status returned by target_wait().  */
 259   get_last_target_status (&wait_ptid, &wait_status);
 260
 261   /* Make sure we were stopped either at a breakpoint, or because
 262      of a Ctrl-C.  */
 263   if (wait_status.kind != TARGET_WAITKIND_STOPPED
 264       || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
 265           wait_status.value.sig != TARGET_SIGNAL_INT))
 266     {
 267       return 0;
 268     }
 269
 270   if (!ptid_equal (wait_ptid, minus_one_ptid)
 271       && !ptid_equal (inferior_ptid, wait_ptid))
 272     {
 273       /* Switched over from WAIT_PID.  */
 274       CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
 275
 276       if (wait_pc != read_pc ())
 277         {
 278           if (select_it)
 279             {
 280               /* Switch back to WAIT_PID thread.  */
 281               inferior_ptid = wait_ptid;
 282
 283               /* FIXME: This stuff came from switch_to_thread() in
 284                  thread.c (which should probably be a public function).  */
 285               flush_cached_frames ();
 286               registers_changed ();
 287               stop_pc = wait_pc;
 288               select_frame (get_current_frame (), 0);
 289             }
 290           /* We return 1 to indicate that there is a breakpoint here,
 291              so we need to step over it before continuing to avoid
 292              hitting it straight away. */
 293           if (breakpoint_here_p (wait_pc))
 294             {
 295               return 1;
 296             }
 297         }
 298     }
 299   return 0;
 300
 301 }
 302
 303 void
 304 init_frame_pc_noop (int fromleaf, struct frame_info *prev)
 305 {
 306   return;
 307 }
 308
 309 void
 310 init_frame_pc_default (int fromleaf, struct frame_info *prev)
 311 {
 312   if (fromleaf)
 313     prev->pc = SAVED_PC_AFTER_CALL (prev->next);
 314   else if (prev->next != NULL)
 315     prev->pc = FRAME_SAVED_PC (prev->next);
 316   else
 317     prev->pc = read_pc ();
 318 }
 319
 320 int
 321 cannot_register_not (int regnum)
 322 {
 323   return 0;
 324 }
 325 \f
 326 /* Functions to manipulate the endianness of the target.  */
 327
 328 #ifdef TARGET_BYTE_ORDER_SELECTABLE
 329 /* compat - Catch old targets that expect a selectable byte-order to
 330    default to BIG_ENDIAN */
 331 #ifndef TARGET_BYTE_ORDER_DEFAULT
 332 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
 333 #endif
 334 #endif
 335 #if !TARGET_BYTE_ORDER_SELECTABLE_P
 336 #ifndef TARGET_BYTE_ORDER_DEFAULT
 337 /* compat - Catch old non byte-order selectable targets that do not
 338    define TARGET_BYTE_ORDER_DEFAULT and instead expect
 339    TARGET_BYTE_ORDER to be used as the default.  For targets that
 340    defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
 341    below will get a strange compiler warning. */
 342 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
 343 #endif
 344 #endif
 345 #ifndef TARGET_BYTE_ORDER_DEFAULT
 346 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
 347 #endif
 348 /* ``target_byte_order'' is only used when non- multi-arch.
 349    Multi-arch targets obtain the current byte order using
 350    TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
 351 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
 352 int target_byte_order_auto = 1;
 353
 354 static const char endian_big[] = "big";
 355 static const char endian_little[] = "little";
 356 static const char endian_auto[] = "auto";
 357 static const char *endian_enum[] =
 358 {
 359   endian_big,
 360   endian_little,
 361   endian_auto,
 362   NULL,
 363 };
 364 static const char *set_endian_string;
 365
 366 /* Called by ``show endian''.  */
 367
 368 static void
 369 show_endian (char *args, int from_tty)
 370 {
 371   if (TARGET_BYTE_ORDER_AUTO)
 372     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 373                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 374   else
 375     printf_unfiltered ("The target is assumed to be %s endian\n",
 376                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 377 }
 378
 379 static void
 380 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 381 {
 382   if (!TARGET_BYTE_ORDER_SELECTABLE_P)
 383     {
 384       printf_unfiltered ("Byte order is not selectable.");
 385     }
 386   else if (set_endian_string == endian_auto)
 387     {
 388       target_byte_order_auto = 1;
 389     }
 390   else if (set_endian_string == endian_little)
 391     {
 392       target_byte_order_auto = 0;
 393       if (GDB_MULTI_ARCH)
 394         {
 395           struct gdbarch_info info;
 396           memset (&info, 0, sizeof info);
 397           info.byte_order = LITTLE_ENDIAN;
 398           if (! gdbarch_update_p (info))
 399             {
 400               printf_unfiltered ("Little endian target not supported by GDB\n");
 401             }
 402         }
 403       else
 404         {
 405           target_byte_order = LITTLE_ENDIAN;
 406         }
 407     }
 408   else if (set_endian_string == endian_big)
 409     {
 410       target_byte_order_auto = 0;
 411       if (GDB_MULTI_ARCH)
 412         {
 413           struct gdbarch_info info;
 414           memset (&info, 0, sizeof info);
 415           info.byte_order = BIG_ENDIAN;
 416           if (! gdbarch_update_p (info))
 417             {
 418               printf_unfiltered ("Big endian target not supported by GDB\n");
 419             }
 420         }
 421       else
 422         {
 423           target_byte_order = BIG_ENDIAN;
 424         }
 425     }
 426   else
 427     internal_error (__FILE__, __LINE__,
 428                     "set_endian: bad value");
 429   show_endian (NULL, from_tty);
 430 }
 431
 432 /* Set the endianness from a BFD.  */
 433
 434 static void
 435 set_endian_from_file (bfd *abfd)
 436 {
 437   if (GDB_MULTI_ARCH)
 438     internal_error (__FILE__, __LINE__,
 439                     "set_endian_from_file: not for multi-arch");
 440   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 441     {
 442       int want;
 443
 444       if (bfd_big_endian (abfd))
 445         want = BIG_ENDIAN;
 446       else
 447         want = LITTLE_ENDIAN;
 448       if (TARGET_BYTE_ORDER_AUTO)
 449         target_byte_order = want;
 450       else if (TARGET_BYTE_ORDER != want)
 451         warning ("%s endian file does not match %s endian target.",
 452                  want == BIG_ENDIAN ? "big" : "little",
 453                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 454     }
 455   else
 456     {
 457       if (bfd_big_endian (abfd)
 458           ? TARGET_BYTE_ORDER != BIG_ENDIAN
 459           : TARGET_BYTE_ORDER == BIG_ENDIAN)
 460         warning ("%s endian file does not match %s endian target.",
 461                  bfd_big_endian (abfd) ? "big" : "little",
 462                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 463     }
 464 }
 465
 466
 467 /* Functions to manipulate the architecture of the target */
 468
 469 enum set_arch { set_arch_auto, set_arch_manual };
 470
 471 int target_architecture_auto = 1;
 472
 473 const char *set_architecture_string;
 474
 475 /* Old way of changing the current architecture. */
 476
 477 extern const struct bfd_arch_info bfd_default_arch_struct;
 478 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 479 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 480
 481 static int
 482 arch_ok (const struct bfd_arch_info *arch)
 483 {
 484   if (GDB_MULTI_ARCH)
 485     internal_error (__FILE__, __LINE__,
 486                     "arch_ok: not multi-arched");
 487   /* Should be performing the more basic check that the binary is
 488      compatible with GDB. */
 489   /* Check with the target that the architecture is valid. */
 490   return (target_architecture_hook == NULL
 491           || target_architecture_hook (arch));
 492 }
 493
 494 static void
 495 set_arch (const struct bfd_arch_info *arch,
 496           enum set_arch type)
 497 {
 498   if (GDB_MULTI_ARCH)
 499     internal_error (__FILE__, __LINE__,
 500                     "set_arch: not multi-arched");
 501   switch (type)
 502     {
 503     case set_arch_auto:
 504       if (!arch_ok (arch))
 505         warning ("Target may not support %s architecture",
 506                  arch->printable_name);
 507       target_architecture = arch;
 508       break;
 509     case set_arch_manual:
 510       if (!arch_ok (arch))
 511         {
 512           printf_unfiltered ("Target does not support `%s' architecture.\n",
 513                              arch->printable_name);
 514         }
 515       else
 516         {
 517           target_architecture_auto = 0;
 518           target_architecture = arch;
 519         }
 520       break;
 521     }
 522   if (gdbarch_debug)
 523     gdbarch_dump (current_gdbarch, gdb_stdlog);
 524 }
 525
 526 /* Set the architecture from arch/machine (deprecated) */
 527
 528 void
 529 set_architecture_from_arch_mach (enum bfd_architecture arch,
 530                                  unsigned long mach)
 531 {
 532   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 533   if (GDB_MULTI_ARCH)
 534     internal_error (__FILE__, __LINE__,
 535                     "set_architecture_from_arch_mach: not multi-arched");
 536   if (wanted != NULL)
 537     set_arch (wanted, set_arch_manual);
 538   else
 539     internal_error (__FILE__, __LINE__,
 540                     "gdbarch: hardwired architecture/machine not recognized");
 541 }
 542
 543 /* Set the architecture from a BFD (deprecated) */
 544
 545 static void
 546 set_architecture_from_file (bfd *abfd)
 547 {
 548   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 549   if (GDB_MULTI_ARCH)
 550     internal_error (__FILE__, __LINE__,
 551                     "set_architecture_from_file: not multi-arched");
 552   if (target_architecture_auto)
 553     {
 554       set_arch (wanted, set_arch_auto);
 555     }
 556   else if (wanted != target_architecture)
 557     {
 558       warning ("%s architecture file may be incompatible with %s target.",
 559                wanted->printable_name,
 560                target_architecture->printable_name);
 561     }
 562 }
 563
 564
 565 /* Called if the user enters ``show architecture'' without an
 566    argument. */
 567
 568 static void
 569 show_architecture (char *args, int from_tty)
 570 {
 571   const char *arch;
 572   arch = TARGET_ARCHITECTURE->printable_name;
 573   if (target_architecture_auto)
 574     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 575   else
 576     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 577 }
 578
 579
 580 /* Called if the user enters ``set architecture'' with or without an
 581    argument. */
 582
 583 static void
 584 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 585 {
 586   if (strcmp (set_architecture_string, "auto") == 0)
 587     {
 588       target_architecture_auto = 1;
 589     }
 590   else if (GDB_MULTI_ARCH)
 591     {
 592       struct gdbarch_info info;
 593       memset (&info, 0, sizeof info);
 594       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 595       if (info.bfd_arch_info == NULL)
 596         internal_error (__FILE__, __LINE__,
 597                         "set_architecture: bfd_scan_arch failed");
 598       if (gdbarch_update_p (info))
 599         target_architecture_auto = 0;
 600       else
 601         printf_unfiltered ("Architecture `%s' not recognized.\n",
 602                            set_architecture_string);
 603     }
 604   else
 605     {
 606       const struct bfd_arch_info *arch
 607         = bfd_scan_arch (set_architecture_string);
 608       if (arch == NULL)
 609         internal_error (__FILE__, __LINE__,
 610                         "set_architecture: bfd_scan_arch failed");
 611       set_arch (arch, set_arch_manual);
 612     }
 613   show_architecture (NULL, from_tty);
 614 }
 615
 616 /* Set the dynamic target-system-dependent parameters (architecture,
 617    byte-order) using information found in the BFD */
 618
 619 void
 620 set_gdbarch_from_file (bfd *abfd)
 621 {
 622   if (GDB_MULTI_ARCH)
 623     {
 624       struct gdbarch_info info;
 625       memset (&info, 0, sizeof info);
 626       info.abfd = abfd;
 627       if (! gdbarch_update_p (info))
 628         error ("Architecture of file not recognized.\n");
 629     }
 630   else
 631     {
 632       set_architecture_from_file (abfd);
 633       set_endian_from_file (abfd);
 634     }
 635 }
 636
 637 /* Initialize the current architecture.  Update the ``set
 638    architecture'' command so that it specifies a list of valid
 639    architectures.  */
 640
 641 #ifdef DEFAULT_BFD_ARCH
 642 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 643 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 644 #else
 645 static const bfd_arch_info_type *default_bfd_arch;
 646 #endif
 647
 648 #ifdef DEFAULT_BFD_VEC
 649 extern const bfd_target DEFAULT_BFD_VEC;
 650 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 651 #else
 652 static const bfd_target *default_bfd_vec;
 653 #endif
 654
 655 void
 656 initialize_current_architecture (void)
 657 {
 658   const char **arches = gdbarch_printable_names ();
 659
 660   /* determine a default architecture and byte order. */
 661   struct gdbarch_info info;
 662   memset (&info, 0, sizeof (info));
 663
 664   /* Find a default architecture. */
 665   if (info.bfd_arch_info == NULL
 666       && default_bfd_arch != NULL)
 667     info.bfd_arch_info = default_bfd_arch;
 668   if (info.bfd_arch_info == NULL)
 669     {
 670       /* Choose the architecture by taking the first one
 671          alphabetically. */
 672       const char *chosen = arches[0];
 673       const char **arch;
 674       for (arch = arches; *arch != NULL; arch++)
 675         {
 676           if (strcmp (*arch, chosen) < 0)
 677             chosen = *arch;
 678         }
 679       if (chosen == NULL)
 680         internal_error (__FILE__, __LINE__,
 681                         "initialize_current_architecture: No arch");
 682       info.bfd_arch_info = bfd_scan_arch (chosen);
 683       if (info.bfd_arch_info == NULL)
 684         internal_error (__FILE__, __LINE__,
 685                         "initialize_current_architecture: Arch not found");
 686     }
 687
 688   /* take several guesses at a byte order. */
 689   /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
 690      forced above. */
 691   if (info.byte_order == 0
 692       && default_bfd_vec != NULL)
 693     {
 694       /* Extract BFD's default vector's byte order. */
 695       switch (default_bfd_vec->byteorder)
 696         {
 697         case BFD_ENDIAN_BIG:
 698           info.byte_order = BIG_ENDIAN;
 699           break;
 700         case BFD_ENDIAN_LITTLE:
 701           info.byte_order = LITTLE_ENDIAN;
 702           break;
 703         default:
 704           break;
 705         }
 706     }
 707   if (info.byte_order == 0)
 708     {
 709       /* look for ``*el-*'' in the target name. */
 710       const char *chp;
 711       chp = strchr (target_name, '-');
 712       if (chp != NULL
 713           && chp - 2 >= target_name
 714           && strncmp (chp - 2, "el", 2) == 0)
 715         info.byte_order = LITTLE_ENDIAN;
 716     }
 717   if (info.byte_order == 0)
 718     {
 719       /* Wire it to big-endian!!! */
 720       info.byte_order = BIG_ENDIAN;
 721     }
 722
 723   if (GDB_MULTI_ARCH)
 724     {
 725       if (! gdbarch_update_p (info))
 726         {
 727           internal_error (__FILE__, __LINE__,
 728                           "initialize_current_architecture: Selection of initial architecture failed");
 729         }
 730     }
 731   else
 732     initialize_non_multiarch ();
 733
 734   /* Create the ``set architecture'' command appending ``auto'' to the
 735      list of architectures. */
 736   {
 737     struct cmd_list_element *c;
 738     /* Append ``auto''. */
 739     int nr;
 740     for (nr = 0; arches[nr] != NULL; nr++);
 741     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 742     arches[nr + 0] = "auto";
 743     arches[nr + 1] = NULL;
 744     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 745        of ``const char *''.  We just happen to know that the casts are
 746        safe. */
 747     c = add_set_enum_cmd ("architecture", class_support,
 748                           arches, &set_architecture_string,
 749                           "Set architecture of target.",
 750                           &setlist);
 751     c->function.sfunc = set_architecture;
 752     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 753     /* Don't use set_from_show - need to print both auto/manual and
 754        current setting. */
 755     add_cmd ("architecture", class_support, show_architecture,
 756              "Show the current target architecture", &showlist);
 757   }
 758 }
 759
 760
 761 /* */
 762
 763 extern initialize_file_ftype _initialize_gdbarch_utils;
 764
 765 void
 766 _initialize_gdbarch_utils (void)
 767 {
 768   struct cmd_list_element *c;
 769   c = add_set_enum_cmd ("endian", class_support,
 770                         endian_enum, &set_endian_string,
 771                         "Set endianness of target.",
 772                         &setlist);
 773   c->function.sfunc = set_endian;
 774   /* Don't use set_from_show - need to print both auto/manual and
 775      current setting. */
 776   add_cmd ("endian", class_support, show_endian,
 777            "Show the current byte-order", &showlist);
 778 }