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 default_convert_from_func_ptr_addr (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 /* Functions to manipulate the endianness of the target.  */
 304
 305 #ifdef TARGET_BYTE_ORDER_SELECTABLE
 306 /* compat - Catch old targets that expect a selectable byte-order to
 307    default to BIG_ENDIAN */
 308 #ifndef TARGET_BYTE_ORDER_DEFAULT
 309 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
 310 #endif
 311 #endif
 312 #if !TARGET_BYTE_ORDER_SELECTABLE_P
 313 #ifndef TARGET_BYTE_ORDER_DEFAULT
 314 /* compat - Catch old non byte-order selectable targets that do not
 315    define TARGET_BYTE_ORDER_DEFAULT and instead expect
 316    TARGET_BYTE_ORDER to be used as the default.  For targets that
 317    defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
 318    below will get a strange compiler warning. */
 319 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
 320 #endif
 321 #endif
 322 #ifndef TARGET_BYTE_ORDER_DEFAULT
 323 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
 324 #endif
 325 /* ``target_byte_order'' is only used when non- multi-arch.
 326    Multi-arch targets obtain the current byte order using
 327    TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
 328 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
 329 int target_byte_order_auto = 1;
 330
 331 static const char endian_big[] = "big";
 332 static const char endian_little[] = "little";
 333 static const char endian_auto[] = "auto";
 334 static const char *endian_enum[] =
 335 {
 336   endian_big,
 337   endian_little,
 338   endian_auto,
 339   NULL,
 340 };
 341 static const char *set_endian_string;
 342
 343 /* Called by ``show endian''.  */
 344
 345 static void
 346 show_endian (char *args, int from_tty)
 347 {
 348   if (TARGET_BYTE_ORDER_AUTO)
 349     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 350                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 351   else
 352     printf_unfiltered ("The target is assumed to be %s endian\n",
 353                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 354 }
 355
 356 static void
 357 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 358 {
 359   if (!TARGET_BYTE_ORDER_SELECTABLE_P)
 360     {
 361       printf_unfiltered ("Byte order is not selectable.");
 362     }
 363   else if (set_endian_string == endian_auto)
 364     {
 365       target_byte_order_auto = 1;
 366     }
 367   else if (set_endian_string == endian_little)
 368     {
 369       target_byte_order_auto = 0;
 370       if (GDB_MULTI_ARCH)
 371         {
 372           struct gdbarch_info info;
 373           memset (&info, 0, sizeof info);
 374           info.byte_order = LITTLE_ENDIAN;
 375           if (! gdbarch_update_p (info))
 376             {
 377               printf_unfiltered ("Little endian target not supported by GDB\n");
 378             }
 379         }
 380       else
 381         {
 382           target_byte_order = LITTLE_ENDIAN;
 383         }
 384     }
 385   else if (set_endian_string == endian_big)
 386     {
 387       target_byte_order_auto = 0;
 388       if (GDB_MULTI_ARCH)
 389         {
 390           struct gdbarch_info info;
 391           memset (&info, 0, sizeof info);
 392           info.byte_order = BIG_ENDIAN;
 393           if (! gdbarch_update_p (info))
 394             {
 395               printf_unfiltered ("Big endian target not supported by GDB\n");
 396             }
 397         }
 398       else
 399         {
 400           target_byte_order = BIG_ENDIAN;
 401         }
 402     }
 403   else
 404     internal_error (__FILE__, __LINE__,
 405                     "set_endian: bad value");
 406   show_endian (NULL, from_tty);
 407 }
 408
 409 /* Set the endianness from a BFD.  */
 410
 411 static void
 412 set_endian_from_file (bfd *abfd)
 413 {
 414   if (GDB_MULTI_ARCH)
 415     internal_error (__FILE__, __LINE__,
 416                     "set_endian_from_file: not for multi-arch");
 417   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 418     {
 419       int want;
 420
 421       if (bfd_big_endian (abfd))
 422         want = BIG_ENDIAN;
 423       else
 424         want = LITTLE_ENDIAN;
 425       if (TARGET_BYTE_ORDER_AUTO)
 426         target_byte_order = want;
 427       else if (TARGET_BYTE_ORDER != want)
 428         warning ("%s endian file does not match %s endian target.",
 429                  want == BIG_ENDIAN ? "big" : "little",
 430                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 431     }
 432   else
 433     {
 434       if (bfd_big_endian (abfd)
 435           ? TARGET_BYTE_ORDER != BIG_ENDIAN
 436           : TARGET_BYTE_ORDER == BIG_ENDIAN)
 437         warning ("%s endian file does not match %s endian target.",
 438                  bfd_big_endian (abfd) ? "big" : "little",
 439                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 440     }
 441 }
 442
 443
 444 /* Functions to manipulate the architecture of the target */
 445
 446 enum set_arch { set_arch_auto, set_arch_manual };
 447
 448 int target_architecture_auto = 1;
 449
 450 const char *set_architecture_string;
 451
 452 /* Old way of changing the current architecture. */
 453
 454 extern const struct bfd_arch_info bfd_default_arch_struct;
 455 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 456 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 457
 458 static int
 459 arch_ok (const struct bfd_arch_info *arch)
 460 {
 461   if (GDB_MULTI_ARCH)
 462     internal_error (__FILE__, __LINE__,
 463                     "arch_ok: not multi-arched");
 464   /* Should be performing the more basic check that the binary is
 465      compatible with GDB. */
 466   /* Check with the target that the architecture is valid. */
 467   return (target_architecture_hook == NULL
 468           || target_architecture_hook (arch));
 469 }
 470
 471 static void
 472 set_arch (const struct bfd_arch_info *arch,
 473           enum set_arch type)
 474 {
 475   if (GDB_MULTI_ARCH)
 476     internal_error (__FILE__, __LINE__,
 477                     "set_arch: not multi-arched");
 478   switch (type)
 479     {
 480     case set_arch_auto:
 481       if (!arch_ok (arch))
 482         warning ("Target may not support %s architecture",
 483                  arch->printable_name);
 484       target_architecture = arch;
 485       break;
 486     case set_arch_manual:
 487       if (!arch_ok (arch))
 488         {
 489           printf_unfiltered ("Target does not support `%s' architecture.\n",
 490                              arch->printable_name);
 491         }
 492       else
 493         {
 494           target_architecture_auto = 0;
 495           target_architecture = arch;
 496         }
 497       break;
 498     }
 499   if (gdbarch_debug)
 500     gdbarch_dump (current_gdbarch, gdb_stdlog);
 501 }
 502
 503 /* Set the architecture from arch/machine (deprecated) */
 504
 505 void
 506 set_architecture_from_arch_mach (enum bfd_architecture arch,
 507                                  unsigned long mach)
 508 {
 509   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 510   if (GDB_MULTI_ARCH)
 511     internal_error (__FILE__, __LINE__,
 512                     "set_architecture_from_arch_mach: not multi-arched");
 513   if (wanted != NULL)
 514     set_arch (wanted, set_arch_manual);
 515   else
 516     internal_error (__FILE__, __LINE__,
 517                     "gdbarch: hardwired architecture/machine not recognized");
 518 }
 519
 520 /* Set the architecture from a BFD (deprecated) */
 521
 522 static void
 523 set_architecture_from_file (bfd *abfd)
 524 {
 525   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 526   if (GDB_MULTI_ARCH)
 527     internal_error (__FILE__, __LINE__,
 528                     "set_architecture_from_file: not multi-arched");
 529   if (target_architecture_auto)
 530     {
 531       set_arch (wanted, set_arch_auto);
 532     }
 533   else if (wanted != target_architecture)
 534     {
 535       warning ("%s architecture file may be incompatible with %s target.",
 536                wanted->printable_name,
 537                target_architecture->printable_name);
 538     }
 539 }
 540
 541
 542 /* Called if the user enters ``show architecture'' without an
 543    argument. */
 544
 545 static void
 546 show_architecture (char *args, int from_tty)
 547 {
 548   const char *arch;
 549   arch = TARGET_ARCHITECTURE->printable_name;
 550   if (target_architecture_auto)
 551     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 552   else
 553     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 554 }
 555
 556
 557 /* Called if the user enters ``set architecture'' with or without an
 558    argument. */
 559
 560 static void
 561 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 562 {
 563   if (strcmp (set_architecture_string, "auto") == 0)
 564     {
 565       target_architecture_auto = 1;
 566     }
 567   else if (GDB_MULTI_ARCH)
 568     {
 569       struct gdbarch_info info;
 570       memset (&info, 0, sizeof info);
 571       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 572       if (info.bfd_arch_info == NULL)
 573         internal_error (__FILE__, __LINE__,
 574                         "set_architecture: bfd_scan_arch failed");
 575       if (gdbarch_update_p (info))
 576         target_architecture_auto = 0;
 577       else
 578         printf_unfiltered ("Architecture `%s' not recognized.\n",
 579                            set_architecture_string);
 580     }
 581   else
 582     {
 583       const struct bfd_arch_info *arch
 584         = bfd_scan_arch (set_architecture_string);
 585       if (arch == NULL)
 586         internal_error (__FILE__, __LINE__,
 587                         "set_architecture: bfd_scan_arch failed");
 588       set_arch (arch, set_arch_manual);
 589     }
 590   show_architecture (NULL, from_tty);
 591 }
 592
 593 /* Set the dynamic target-system-dependent parameters (architecture,
 594    byte-order) using information found in the BFD */
 595
 596 void
 597 set_gdbarch_from_file (bfd *abfd)
 598 {
 599   if (GDB_MULTI_ARCH)
 600     {
 601       struct gdbarch_info info;
 602       memset (&info, 0, sizeof info);
 603       info.abfd = abfd;
 604       if (! gdbarch_update_p (info))
 605         error ("Architecture of file not recognized.\n");
 606     }
 607   else
 608     {
 609       set_architecture_from_file (abfd);
 610       set_endian_from_file (abfd);
 611     }
 612 }
 613
 614 /* Initialize the current architecture.  Update the ``set
 615    architecture'' command so that it specifies a list of valid
 616    architectures.  */
 617
 618 #ifdef DEFAULT_BFD_ARCH
 619 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 620 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 621 #else
 622 static const bfd_arch_info_type *default_bfd_arch;
 623 #endif
 624
 625 #ifdef DEFAULT_BFD_VEC
 626 extern const bfd_target DEFAULT_BFD_VEC;
 627 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 628 #else
 629 static const bfd_target *default_bfd_vec;
 630 #endif
 631
 632 void
 633 initialize_current_architecture (void)
 634 {
 635   const char **arches = gdbarch_printable_names ();
 636
 637   /* determine a default architecture and byte order. */
 638   struct gdbarch_info info;
 639   memset (&info, 0, sizeof (info));
 640
 641   /* Find a default architecture. */
 642   if (info.bfd_arch_info == NULL
 643       && default_bfd_arch != NULL)
 644     info.bfd_arch_info = default_bfd_arch;
 645   if (info.bfd_arch_info == NULL)
 646     {
 647       /* Choose the architecture by taking the first one
 648          alphabetically. */
 649       const char *chosen = arches[0];
 650       const char **arch;
 651       for (arch = arches; *arch != NULL; arch++)
 652         {
 653           if (strcmp (*arch, chosen) < 0)
 654             chosen = *arch;
 655         }
 656       if (chosen == NULL)
 657         internal_error (__FILE__, __LINE__,
 658                         "initialize_current_architecture: No arch");
 659       info.bfd_arch_info = bfd_scan_arch (chosen);
 660       if (info.bfd_arch_info == NULL)
 661         internal_error (__FILE__, __LINE__,
 662                         "initialize_current_architecture: Arch not found");
 663     }
 664
 665   /* take several guesses at a byte order. */
 666   /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
 667      forced above. */
 668   if (info.byte_order == 0
 669       && default_bfd_vec != NULL)
 670     {
 671       /* Extract BFD's default vector's byte order. */
 672       switch (default_bfd_vec->byteorder)
 673         {
 674         case BFD_ENDIAN_BIG:
 675           info.byte_order = BIG_ENDIAN;
 676           break;
 677         case BFD_ENDIAN_LITTLE:
 678           info.byte_order = LITTLE_ENDIAN;
 679           break;
 680         default:
 681           break;
 682         }
 683     }
 684   if (info.byte_order == 0)
 685     {
 686       /* look for ``*el-*'' in the target name. */
 687       const char *chp;
 688       chp = strchr (target_name, '-');
 689       if (chp != NULL
 690           && chp - 2 >= target_name
 691           && strncmp (chp - 2, "el", 2) == 0)
 692         info.byte_order = LITTLE_ENDIAN;
 693     }
 694   if (info.byte_order == 0)
 695     {
 696       /* Wire it to big-endian!!! */
 697       info.byte_order = BIG_ENDIAN;
 698     }
 699
 700   if (GDB_MULTI_ARCH)
 701     {
 702       if (! gdbarch_update_p (info))
 703         {
 704           internal_error (__FILE__, __LINE__,
 705                           "initialize_current_architecture: Selection of initial architecture failed");
 706         }
 707     }
 708
 709   /* Create the ``set architecture'' command appending ``auto'' to the
 710      list of architectures. */
 711   {
 712     struct cmd_list_element *c;
 713     /* Append ``auto''. */
 714     int nr;
 715     for (nr = 0; arches[nr] != NULL; nr++);
 716     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 717     arches[nr + 0] = "auto";
 718     arches[nr + 1] = NULL;
 719     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 720        of ``const char *''.  We just happen to know that the casts are
 721        safe. */
 722     c = add_set_enum_cmd ("architecture", class_support,
 723                           arches, &set_architecture_string,
 724                           "Set architecture of target.",
 725                           &setlist);
 726     c->function.sfunc = set_architecture;
 727     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 728     /* Don't use set_from_show - need to print both auto/manual and
 729        current setting. */
 730     add_cmd ("architecture", class_support, show_architecture,
 731              "Show the current target architecture", &showlist);
 732   }
 733 }
 734
 735
 736 /* */
 737
 738 extern initialize_file_ftype _initialize_gdbarch_utils;
 739
 740 void
 741 _initialize_gdbarch_utils (void)
 742 {
 743   struct cmd_list_element *c;
 744   c = add_set_enum_cmd ("endian", class_support,
 745                         endian_enum, &set_endian_string,
 746                         "Set endianness of target.",
 747                         &setlist);
 748   c->function.sfunc = set_endian;
 749   /* Don't use set_from_show - need to print both auto/manual and
 750      current setting. */
 751   add_cmd ("endian", class_support, show_endian,
 752            "Show the current byte-order", &showlist);
 753 }