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 int
 310 cannot_register_not (int regnum)
 311 {
 312   return 0;
 313 }
 314 \f
 315 /* Functions to manipulate the endianness of the target.  */
 316
 317 #ifdef TARGET_BYTE_ORDER_SELECTABLE
 318 /* compat - Catch old targets that expect a selectable byte-order to
 319    default to BIG_ENDIAN */
 320 #ifndef TARGET_BYTE_ORDER_DEFAULT
 321 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
 322 #endif
 323 #endif
 324 #if !TARGET_BYTE_ORDER_SELECTABLE_P
 325 #ifndef TARGET_BYTE_ORDER_DEFAULT
 326 /* compat - Catch old non byte-order selectable targets that do not
 327    define TARGET_BYTE_ORDER_DEFAULT and instead expect
 328    TARGET_BYTE_ORDER to be used as the default.  For targets that
 329    defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
 330    below will get a strange compiler warning. */
 331 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
 332 #endif
 333 #endif
 334 #ifndef TARGET_BYTE_ORDER_DEFAULT
 335 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
 336 #endif
 337 /* ``target_byte_order'' is only used when non- multi-arch.
 338    Multi-arch targets obtain the current byte order using
 339    TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
 340 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
 341 int target_byte_order_auto = 1;
 342
 343 static const char endian_big[] = "big";
 344 static const char endian_little[] = "little";
 345 static const char endian_auto[] = "auto";
 346 static const char *endian_enum[] =
 347 {
 348   endian_big,
 349   endian_little,
 350   endian_auto,
 351   NULL,
 352 };
 353 static const char *set_endian_string;
 354
 355 /* Called by ``show endian''.  */
 356
 357 static void
 358 show_endian (char *args, int from_tty)
 359 {
 360   if (TARGET_BYTE_ORDER_AUTO)
 361     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 362                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 363   else
 364     printf_unfiltered ("The target is assumed to be %s endian\n",
 365                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 366 }
 367
 368 static void
 369 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 370 {
 371   if (!TARGET_BYTE_ORDER_SELECTABLE_P)
 372     {
 373       printf_unfiltered ("Byte order is not selectable.");
 374     }
 375   else if (set_endian_string == endian_auto)
 376     {
 377       target_byte_order_auto = 1;
 378     }
 379   else if (set_endian_string == endian_little)
 380     {
 381       target_byte_order_auto = 0;
 382       if (GDB_MULTI_ARCH)
 383         {
 384           struct gdbarch_info info;
 385           memset (&info, 0, sizeof info);
 386           info.byte_order = LITTLE_ENDIAN;
 387           if (! gdbarch_update_p (info))
 388             {
 389               printf_unfiltered ("Little endian target not supported by GDB\n");
 390             }
 391         }
 392       else
 393         {
 394           target_byte_order = LITTLE_ENDIAN;
 395         }
 396     }
 397   else if (set_endian_string == endian_big)
 398     {
 399       target_byte_order_auto = 0;
 400       if (GDB_MULTI_ARCH)
 401         {
 402           struct gdbarch_info info;
 403           memset (&info, 0, sizeof info);
 404           info.byte_order = BIG_ENDIAN;
 405           if (! gdbarch_update_p (info))
 406             {
 407               printf_unfiltered ("Big endian target not supported by GDB\n");
 408             }
 409         }
 410       else
 411         {
 412           target_byte_order = BIG_ENDIAN;
 413         }
 414     }
 415   else
 416     internal_error (__FILE__, __LINE__,
 417                     "set_endian: bad value");
 418   show_endian (NULL, from_tty);
 419 }
 420
 421 /* Set the endianness from a BFD.  */
 422
 423 static void
 424 set_endian_from_file (bfd *abfd)
 425 {
 426   if (GDB_MULTI_ARCH)
 427     internal_error (__FILE__, __LINE__,
 428                     "set_endian_from_file: not for multi-arch");
 429   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 430     {
 431       int want;
 432
 433       if (bfd_big_endian (abfd))
 434         want = BIG_ENDIAN;
 435       else
 436         want = LITTLE_ENDIAN;
 437       if (TARGET_BYTE_ORDER_AUTO)
 438         target_byte_order = want;
 439       else if (TARGET_BYTE_ORDER != want)
 440         warning ("%s endian file does not match %s endian target.",
 441                  want == BIG_ENDIAN ? "big" : "little",
 442                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 443     }
 444   else
 445     {
 446       if (bfd_big_endian (abfd)
 447           ? TARGET_BYTE_ORDER != BIG_ENDIAN
 448           : TARGET_BYTE_ORDER == BIG_ENDIAN)
 449         warning ("%s endian file does not match %s endian target.",
 450                  bfd_big_endian (abfd) ? "big" : "little",
 451                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 452     }
 453 }
 454
 455
 456 /* Functions to manipulate the architecture of the target */
 457
 458 enum set_arch { set_arch_auto, set_arch_manual };
 459
 460 int target_architecture_auto = 1;
 461
 462 const char *set_architecture_string;
 463
 464 /* Old way of changing the current architecture. */
 465
 466 extern const struct bfd_arch_info bfd_default_arch_struct;
 467 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 468 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 469
 470 static int
 471 arch_ok (const struct bfd_arch_info *arch)
 472 {
 473   if (GDB_MULTI_ARCH)
 474     internal_error (__FILE__, __LINE__,
 475                     "arch_ok: not multi-arched");
 476   /* Should be performing the more basic check that the binary is
 477      compatible with GDB. */
 478   /* Check with the target that the architecture is valid. */
 479   return (target_architecture_hook == NULL
 480           || target_architecture_hook (arch));
 481 }
 482
 483 static void
 484 set_arch (const struct bfd_arch_info *arch,
 485           enum set_arch type)
 486 {
 487   if (GDB_MULTI_ARCH)
 488     internal_error (__FILE__, __LINE__,
 489                     "set_arch: not multi-arched");
 490   switch (type)
 491     {
 492     case set_arch_auto:
 493       if (!arch_ok (arch))
 494         warning ("Target may not support %s architecture",
 495                  arch->printable_name);
 496       target_architecture = arch;
 497       break;
 498     case set_arch_manual:
 499       if (!arch_ok (arch))
 500         {
 501           printf_unfiltered ("Target does not support `%s' architecture.\n",
 502                              arch->printable_name);
 503         }
 504       else
 505         {
 506           target_architecture_auto = 0;
 507           target_architecture = arch;
 508         }
 509       break;
 510     }
 511   if (gdbarch_debug)
 512     gdbarch_dump (current_gdbarch, gdb_stdlog);
 513 }
 514
 515 /* Set the architecture from arch/machine (deprecated) */
 516
 517 void
 518 set_architecture_from_arch_mach (enum bfd_architecture arch,
 519                                  unsigned long mach)
 520 {
 521   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 522   if (GDB_MULTI_ARCH)
 523     internal_error (__FILE__, __LINE__,
 524                     "set_architecture_from_arch_mach: not multi-arched");
 525   if (wanted != NULL)
 526     set_arch (wanted, set_arch_manual);
 527   else
 528     internal_error (__FILE__, __LINE__,
 529                     "gdbarch: hardwired architecture/machine not recognized");
 530 }
 531
 532 /* Set the architecture from a BFD (deprecated) */
 533
 534 static void
 535 set_architecture_from_file (bfd *abfd)
 536 {
 537   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 538   if (GDB_MULTI_ARCH)
 539     internal_error (__FILE__, __LINE__,
 540                     "set_architecture_from_file: not multi-arched");
 541   if (target_architecture_auto)
 542     {
 543       set_arch (wanted, set_arch_auto);
 544     }
 545   else if (wanted != target_architecture)
 546     {
 547       warning ("%s architecture file may be incompatible with %s target.",
 548                wanted->printable_name,
 549                target_architecture->printable_name);
 550     }
 551 }
 552
 553
 554 /* Called if the user enters ``show architecture'' without an
 555    argument. */
 556
 557 static void
 558 show_architecture (char *args, int from_tty)
 559 {
 560   const char *arch;
 561   arch = TARGET_ARCHITECTURE->printable_name;
 562   if (target_architecture_auto)
 563     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 564   else
 565     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 566 }
 567
 568
 569 /* Called if the user enters ``set architecture'' with or without an
 570    argument. */
 571
 572 static void
 573 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 574 {
 575   if (strcmp (set_architecture_string, "auto") == 0)
 576     {
 577       target_architecture_auto = 1;
 578     }
 579   else if (GDB_MULTI_ARCH)
 580     {
 581       struct gdbarch_info info;
 582       memset (&info, 0, sizeof info);
 583       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 584       if (info.bfd_arch_info == NULL)
 585         internal_error (__FILE__, __LINE__,
 586                         "set_architecture: bfd_scan_arch failed");
 587       if (gdbarch_update_p (info))
 588         target_architecture_auto = 0;
 589       else
 590         printf_unfiltered ("Architecture `%s' not recognized.\n",
 591                            set_architecture_string);
 592     }
 593   else
 594     {
 595       const struct bfd_arch_info *arch
 596         = bfd_scan_arch (set_architecture_string);
 597       if (arch == NULL)
 598         internal_error (__FILE__, __LINE__,
 599                         "set_architecture: bfd_scan_arch failed");
 600       set_arch (arch, set_arch_manual);
 601     }
 602   show_architecture (NULL, from_tty);
 603 }
 604
 605 /* Set the dynamic target-system-dependent parameters (architecture,
 606    byte-order) using information found in the BFD */
 607
 608 void
 609 set_gdbarch_from_file (bfd *abfd)
 610 {
 611   if (GDB_MULTI_ARCH)
 612     {
 613       struct gdbarch_info info;
 614       memset (&info, 0, sizeof info);
 615       info.abfd = abfd;
 616       if (! gdbarch_update_p (info))
 617         error ("Architecture of file not recognized.\n");
 618     }
 619   else
 620     {
 621       set_architecture_from_file (abfd);
 622       set_endian_from_file (abfd);
 623     }
 624 }
 625
 626 /* Initialize the current architecture.  Update the ``set
 627    architecture'' command so that it specifies a list of valid
 628    architectures.  */
 629
 630 #ifdef DEFAULT_BFD_ARCH
 631 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 632 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 633 #else
 634 static const bfd_arch_info_type *default_bfd_arch;
 635 #endif
 636
 637 #ifdef DEFAULT_BFD_VEC
 638 extern const bfd_target DEFAULT_BFD_VEC;
 639 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 640 #else
 641 static const bfd_target *default_bfd_vec;
 642 #endif
 643
 644 void
 645 initialize_current_architecture (void)
 646 {
 647   const char **arches = gdbarch_printable_names ();
 648
 649   /* determine a default architecture and byte order. */
 650   struct gdbarch_info info;
 651   memset (&info, 0, sizeof (info));
 652
 653   /* Find a default architecture. */
 654   if (info.bfd_arch_info == NULL
 655       && default_bfd_arch != NULL)
 656     info.bfd_arch_info = default_bfd_arch;
 657   if (info.bfd_arch_info == NULL)
 658     {
 659       /* Choose the architecture by taking the first one
 660          alphabetically. */
 661       const char *chosen = arches[0];
 662       const char **arch;
 663       for (arch = arches; *arch != NULL; arch++)
 664         {
 665           if (strcmp (*arch, chosen) < 0)
 666             chosen = *arch;
 667         }
 668       if (chosen == NULL)
 669         internal_error (__FILE__, __LINE__,
 670                         "initialize_current_architecture: No arch");
 671       info.bfd_arch_info = bfd_scan_arch (chosen);
 672       if (info.bfd_arch_info == NULL)
 673         internal_error (__FILE__, __LINE__,
 674                         "initialize_current_architecture: Arch not found");
 675     }
 676
 677   /* take several guesses at a byte order. */
 678   /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
 679      forced above. */
 680   if (info.byte_order == 0
 681       && default_bfd_vec != NULL)
 682     {
 683       /* Extract BFD's default vector's byte order. */
 684       switch (default_bfd_vec->byteorder)
 685         {
 686         case BFD_ENDIAN_BIG:
 687           info.byte_order = BIG_ENDIAN;
 688           break;
 689         case BFD_ENDIAN_LITTLE:
 690           info.byte_order = LITTLE_ENDIAN;
 691           break;
 692         default:
 693           break;
 694         }
 695     }
 696   if (info.byte_order == 0)
 697     {
 698       /* look for ``*el-*'' in the target name. */
 699       const char *chp;
 700       chp = strchr (target_name, '-');
 701       if (chp != NULL
 702           && chp - 2 >= target_name
 703           && strncmp (chp - 2, "el", 2) == 0)
 704         info.byte_order = LITTLE_ENDIAN;
 705     }
 706   if (info.byte_order == 0)
 707     {
 708       /* Wire it to big-endian!!! */
 709       info.byte_order = BIG_ENDIAN;
 710     }
 711
 712   if (GDB_MULTI_ARCH)
 713     {
 714       if (! gdbarch_update_p (info))
 715         {
 716           internal_error (__FILE__, __LINE__,
 717                           "initialize_current_architecture: Selection of initial architecture failed");
 718         }
 719     }
 720   else
 721     initialize_non_multiarch ();
 722
 723   /* Create the ``set architecture'' command appending ``auto'' to the
 724      list of architectures. */
 725   {
 726     struct cmd_list_element *c;
 727     /* Append ``auto''. */
 728     int nr;
 729     for (nr = 0; arches[nr] != NULL; nr++);
 730     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 731     arches[nr + 0] = "auto";
 732     arches[nr + 1] = NULL;
 733     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 734        of ``const char *''.  We just happen to know that the casts are
 735        safe. */
 736     c = add_set_enum_cmd ("architecture", class_support,
 737                           arches, &set_architecture_string,
 738                           "Set architecture of target.",
 739                           &setlist);
 740     c->function.sfunc = set_architecture;
 741     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 742     /* Don't use set_from_show - need to print both auto/manual and
 743        current setting. */
 744     add_cmd ("architecture", class_support, show_architecture,
 745              "Show the current target architecture", &showlist);
 746   }
 747 }
 748
 749
 750 /* */
 751
 752 extern initialize_file_ftype _initialize_gdbarch_utils;
 753
 754 void
 755 _initialize_gdbarch_utils (void)
 756 {
 757   struct cmd_list_element *c;
 758   c = add_set_enum_cmd ("endian", class_support,
 759                         endian_enum, &set_endian_string,
 760                         "Set endianness of target.",
 761                         &setlist);
 762   c->function.sfunc = set_endian;
 763   /* Don't use set_from_show - need to print both auto/manual and
 764      current setting. */
 765   add_cmd ("endian", class_support, show_endian,
 766            "Show the current byte-order", &showlist);
 767 }