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   int wait_pid;
 256   struct target_waitstatus wait_status;
 257
 258   /* Get the last target status returned by target_wait().  */
 259   get_last_target_status (&wait_pid, &wait_status);
 260
 261   /* Make sure we were stopped at a breakpoint.  */
 262   if (wait_status.kind != TARGET_WAITKIND_STOPPED
 263       || wait_status.value.sig != TARGET_SIGNAL_TRAP)
 264     {
 265       return 0;
 266     }
 267
 268   if (wait_pid != -1 && inferior_pid != wait_pid)
 269     {
 270       /* Switched over from WAIT_PID.  */
 271       CORE_ADDR wait_pc = read_pc_pid (wait_pid);
 272
 273       /* Avoid switching where it wouldn't do any good, i.e. if both
 274          threads are at the same breakpoint.  */
 275       if (wait_pc != read_pc () && breakpoint_here_p (wait_pc))
 276         {
 277           if (select_it)
 278             {
 279               /* User hasn't deleted the breakpoint.  Switch back to
 280                  WAIT_PID and return non-zero.  */
 281               inferior_pid = wait_pid;
 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
 291           return 1;
 292         }
 293     }
 294   return 0;
 295
 296 }
 297
 298 /* Functions to manipulate the endianness of the target.  */
 299
 300 #ifdef TARGET_BYTE_ORDER_SELECTABLE
 301 /* compat - Catch old targets that expect a selectable byte-order to
 302    default to BIG_ENDIAN */
 303 #ifndef TARGET_BYTE_ORDER_DEFAULT
 304 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
 305 #endif
 306 #endif
 307 #if !TARGET_BYTE_ORDER_SELECTABLE_P
 308 #ifndef TARGET_BYTE_ORDER_DEFAULT
 309 /* compat - Catch old non byte-order selectable targets that do not
 310    define TARGET_BYTE_ORDER_DEFAULT and instead expect
 311    TARGET_BYTE_ORDER to be used as the default.  For targets that
 312    defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
 313    below will get a strange compiler warning. */
 314 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
 315 #endif
 316 #endif
 317 #ifndef TARGET_BYTE_ORDER_DEFAULT
 318 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
 319 #endif
 320 /* ``target_byte_order'' is only used when non- multi-arch.
 321    Multi-arch targets obtain the current byte order using
 322    TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
 323 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
 324 int target_byte_order_auto = 1;
 325
 326 static const char endian_big[] = "big";
 327 static const char endian_little[] = "little";
 328 static const char endian_auto[] = "auto";
 329 static const char *endian_enum[] =
 330 {
 331   endian_big,
 332   endian_little,
 333   endian_auto,
 334   NULL,
 335 };
 336 static const char *set_endian_string;
 337
 338 /* Called by ``show endian''.  */
 339
 340 static void
 341 show_endian (char *args, int from_tty)
 342 {
 343   if (TARGET_BYTE_ORDER_AUTO)
 344     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 345                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 346   else
 347     printf_unfiltered ("The target is assumed to be %s endian\n",
 348                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 349 }
 350
 351 static void
 352 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 353 {
 354   if (!TARGET_BYTE_ORDER_SELECTABLE_P)
 355     {
 356       printf_unfiltered ("Byte order is not selectable.");
 357     }
 358   else if (set_endian_string == endian_auto)
 359     {
 360       target_byte_order_auto = 1;
 361     }
 362   else if (set_endian_string == endian_little)
 363     {
 364       target_byte_order_auto = 0;
 365       if (GDB_MULTI_ARCH)
 366         {
 367           struct gdbarch_info info;
 368           memset (&info, 0, sizeof info);
 369           info.byte_order = LITTLE_ENDIAN;
 370           if (! gdbarch_update_p (info))
 371             {
 372               printf_unfiltered ("Little endian target not supported by GDB\n");
 373             }
 374         }
 375       else
 376         {
 377           target_byte_order = LITTLE_ENDIAN;
 378         }
 379     }
 380   else if (set_endian_string == endian_big)
 381     {
 382       target_byte_order_auto = 0;
 383       if (GDB_MULTI_ARCH)
 384         {
 385           struct gdbarch_info info;
 386           memset (&info, 0, sizeof info);
 387           info.byte_order = BIG_ENDIAN;
 388           if (! gdbarch_update_p (info))
 389             {
 390               printf_unfiltered ("Big endian target not supported by GDB\n");
 391             }
 392         }
 393       else
 394         {
 395           target_byte_order = BIG_ENDIAN;
 396         }
 397     }
 398   else
 399     internal_error (__FILE__, __LINE__,
 400                     "set_endian: bad value");
 401   show_endian (NULL, from_tty);
 402 }
 403
 404 /* Set the endianness from a BFD.  */
 405
 406 static void
 407 set_endian_from_file (bfd *abfd)
 408 {
 409   if (GDB_MULTI_ARCH)
 410     internal_error (__FILE__, __LINE__,
 411                     "set_endian_from_file: not for multi-arch");
 412   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 413     {
 414       int want;
 415
 416       if (bfd_big_endian (abfd))
 417         want = BIG_ENDIAN;
 418       else
 419         want = LITTLE_ENDIAN;
 420       if (TARGET_BYTE_ORDER_AUTO)
 421         target_byte_order = want;
 422       else if (TARGET_BYTE_ORDER != want)
 423         warning ("%s endian file does not match %s endian target.",
 424                  want == BIG_ENDIAN ? "big" : "little",
 425                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 426     }
 427   else
 428     {
 429       if (bfd_big_endian (abfd)
 430           ? TARGET_BYTE_ORDER != BIG_ENDIAN
 431           : TARGET_BYTE_ORDER == BIG_ENDIAN)
 432         warning ("%s endian file does not match %s endian target.",
 433                  bfd_big_endian (abfd) ? "big" : "little",
 434                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 435     }
 436 }
 437
 438
 439 /* Functions to manipulate the architecture of the target */
 440
 441 enum set_arch { set_arch_auto, set_arch_manual };
 442
 443 int target_architecture_auto = 1;
 444
 445 const char *set_architecture_string;
 446
 447 /* Old way of changing the current architecture. */
 448
 449 extern const struct bfd_arch_info bfd_default_arch_struct;
 450 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 451 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 452
 453 static int
 454 arch_ok (const struct bfd_arch_info *arch)
 455 {
 456   if (GDB_MULTI_ARCH)
 457     internal_error (__FILE__, __LINE__,
 458                     "arch_ok: not multi-arched");
 459   /* Should be performing the more basic check that the binary is
 460      compatible with GDB. */
 461   /* Check with the target that the architecture is valid. */
 462   return (target_architecture_hook == NULL
 463           || target_architecture_hook (arch));
 464 }
 465
 466 static void
 467 set_arch (const struct bfd_arch_info *arch,
 468           enum set_arch type)
 469 {
 470   if (GDB_MULTI_ARCH)
 471     internal_error (__FILE__, __LINE__,
 472                     "set_arch: not multi-arched");
 473   switch (type)
 474     {
 475     case set_arch_auto:
 476       if (!arch_ok (arch))
 477         warning ("Target may not support %s architecture",
 478                  arch->printable_name);
 479       target_architecture = arch;
 480       break;
 481     case set_arch_manual:
 482       if (!arch_ok (arch))
 483         {
 484           printf_unfiltered ("Target does not support `%s' architecture.\n",
 485                              arch->printable_name);
 486         }
 487       else
 488         {
 489           target_architecture_auto = 0;
 490           target_architecture = arch;
 491         }
 492       break;
 493     }
 494   if (gdbarch_debug)
 495     gdbarch_dump (current_gdbarch, gdb_stdlog);
 496 }
 497
 498 /* Set the architecture from arch/machine (deprecated) */
 499
 500 void
 501 set_architecture_from_arch_mach (enum bfd_architecture arch,
 502                                  unsigned long mach)
 503 {
 504   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 505   if (GDB_MULTI_ARCH)
 506     internal_error (__FILE__, __LINE__,
 507                     "set_architecture_from_arch_mach: not multi-arched");
 508   if (wanted != NULL)
 509     set_arch (wanted, set_arch_manual);
 510   else
 511     internal_error (__FILE__, __LINE__,
 512                     "gdbarch: hardwired architecture/machine not recognized");
 513 }
 514
 515 /* Set the architecture from a BFD (deprecated) */
 516
 517 static void
 518 set_architecture_from_file (bfd *abfd)
 519 {
 520   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 521   if (GDB_MULTI_ARCH)
 522     internal_error (__FILE__, __LINE__,
 523                     "set_architecture_from_file: not multi-arched");
 524   if (target_architecture_auto)
 525     {
 526       set_arch (wanted, set_arch_auto);
 527     }
 528   else if (wanted != target_architecture)
 529     {
 530       warning ("%s architecture file may be incompatible with %s target.",
 531                wanted->printable_name,
 532                target_architecture->printable_name);
 533     }
 534 }
 535
 536
 537 /* Called if the user enters ``show architecture'' without an
 538    argument. */
 539
 540 static void
 541 show_architecture (char *args, int from_tty)
 542 {
 543   const char *arch;
 544   arch = TARGET_ARCHITECTURE->printable_name;
 545   if (target_architecture_auto)
 546     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 547   else
 548     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 549 }
 550
 551
 552 /* Called if the user enters ``set architecture'' with or without an
 553    argument. */
 554
 555 static void
 556 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 557 {
 558   if (strcmp (set_architecture_string, "auto") == 0)
 559     {
 560       target_architecture_auto = 1;
 561     }
 562   else if (GDB_MULTI_ARCH)
 563     {
 564       struct gdbarch_info info;
 565       memset (&info, 0, sizeof info);
 566       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 567       if (info.bfd_arch_info == NULL)
 568         internal_error (__FILE__, __LINE__,
 569                         "set_architecture: bfd_scan_arch failed");
 570       if (gdbarch_update_p (info))
 571         target_architecture_auto = 0;
 572       else
 573         printf_unfiltered ("Architecture `%s' not recognized.\n",
 574                            set_architecture_string);
 575     }
 576   else
 577     {
 578       const struct bfd_arch_info *arch
 579         = bfd_scan_arch (set_architecture_string);
 580       if (arch == NULL)
 581         internal_error (__FILE__, __LINE__,
 582                         "set_architecture: bfd_scan_arch failed");
 583       set_arch (arch, set_arch_manual);
 584     }
 585   show_architecture (NULL, from_tty);
 586 }
 587
 588 /* Called if the user enters ``info architecture'' without an argument. */
 589
 590 static void
 591 info_architecture (char *args, int from_tty)
 592 {
 593   printf_filtered ("Available architectures are:\n");
 594   if (GDB_MULTI_ARCH)
 595     {
 596       const char **arches = gdbarch_printable_names ();
 597       const char **arch;
 598       for (arch = arches; *arch != NULL; arch++)
 599         {
 600           printf_filtered (" %s", *arch);
 601         }
 602       xfree (arches);
 603     }
 604   else
 605     {
 606       enum bfd_architecture a;
 607       for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
 608         {
 609           const struct bfd_arch_info *ap;
 610           for (ap = bfd_lookup_arch (a, 0);
 611                ap != NULL;
 612                ap = ap->next)
 613             {
 614               printf_filtered (" %s", ap->printable_name);
 615               ap = ap->next;
 616             }
 617         }
 618     }
 619   printf_filtered ("\n");
 620 }
 621
 622 /* Set the dynamic target-system-dependent parameters (architecture,
 623    byte-order) using information found in the BFD */
 624
 625 void
 626 set_gdbarch_from_file (bfd *abfd)
 627 {
 628   if (GDB_MULTI_ARCH)
 629     {
 630       struct gdbarch_info info;
 631       memset (&info, 0, sizeof info);
 632       info.abfd = abfd;
 633       if (! gdbarch_update_p (info))
 634         error ("Architecture of file not recognized.\n");
 635     }
 636   else
 637     {
 638       set_architecture_from_file (abfd);
 639       set_endian_from_file (abfd);
 640     }
 641 }
 642
 643 /* Initialize the current architecture.  Update the ``set
 644    architecture'' command so that it specifies a list of valid
 645    architectures.  */
 646
 647 #ifdef DEFAULT_BFD_ARCH
 648 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 649 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 650 #else
 651 static const bfd_arch_info_type *default_bfd_arch;
 652 #endif
 653
 654 #ifdef DEFAULT_BFD_VEC
 655 extern const bfd_target DEFAULT_BFD_VEC;
 656 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 657 #else
 658 static const bfd_target *default_bfd_vec;
 659 #endif
 660
 661 void
 662 initialize_current_architecture (void)
 663 {
 664   const char **arches = gdbarch_printable_names ();
 665
 666   /* determine a default architecture and byte order. */
 667   struct gdbarch_info info;
 668   memset (&info, 0, sizeof (info));
 669
 670   /* Find a default architecture. */
 671   if (info.bfd_arch_info == NULL
 672       && default_bfd_arch != NULL)
 673     info.bfd_arch_info = default_bfd_arch;
 674   if (info.bfd_arch_info == NULL)
 675     {
 676       /* Choose the architecture by taking the first one
 677          alphabetically. */
 678       const char *chosen = arches[0];
 679       const char **arch;
 680       for (arch = arches; *arch != NULL; arch++)
 681         {
 682           if (strcmp (*arch, chosen) < 0)
 683             chosen = *arch;
 684         }
 685       if (chosen == NULL)
 686         internal_error (__FILE__, __LINE__,
 687                         "initialize_current_architecture: No arch");
 688       info.bfd_arch_info = bfd_scan_arch (chosen);
 689       if (info.bfd_arch_info == NULL)
 690         internal_error (__FILE__, __LINE__,
 691                         "initialize_current_architecture: Arch not found");
 692     }
 693
 694   /* take several guesses at a byte order. */
 695   /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
 696      forced above. */
 697   if (info.byte_order == 0
 698       && default_bfd_vec != NULL)
 699     {
 700       /* Extract BFD's default vector's byte order. */
 701       switch (default_bfd_vec->byteorder)
 702         {
 703         case BFD_ENDIAN_BIG:
 704           info.byte_order = BIG_ENDIAN;
 705           break;
 706         case BFD_ENDIAN_LITTLE:
 707           info.byte_order = LITTLE_ENDIAN;
 708           break;
 709         default:
 710           break;
 711         }
 712     }
 713   if (info.byte_order == 0)
 714     {
 715       /* look for ``*el-*'' in the target name. */
 716       const char *chp;
 717       chp = strchr (target_name, '-');
 718       if (chp != NULL
 719           && chp - 2 >= target_name
 720           && strncmp (chp - 2, "el", 2) == 0)
 721         info.byte_order = LITTLE_ENDIAN;
 722     }
 723   if (info.byte_order == 0)
 724     {
 725       /* Wire it to big-endian!!! */
 726       info.byte_order = BIG_ENDIAN;
 727     }
 728
 729   if (GDB_MULTI_ARCH)
 730     {
 731       if (! gdbarch_update_p (info))
 732         {
 733           internal_error (__FILE__, __LINE__,
 734                           "initialize_current_architecture: Selection of initial architecture failed");
 735         }
 736     }
 737
 738   /* Create the ``set architecture'' command appending ``auto'' to the
 739      list of architectures. */
 740   {
 741     struct cmd_list_element *c;
 742     /* Append ``auto''. */
 743     int nr;
 744     for (nr = 0; arches[nr] != NULL; nr++);
 745     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 746     arches[nr + 0] = "auto";
 747     arches[nr + 1] = NULL;
 748     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 749        of ``const char *''.  We just happen to know that the casts are
 750        safe. */
 751     c = add_set_enum_cmd ("architecture", class_support,
 752                           arches, &set_architecture_string,
 753                           "Set architecture of target.",
 754                           &setlist);
 755     c->function.sfunc = set_architecture;
 756     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 757     /* Don't use set_from_show - need to print both auto/manual and
 758        current setting. */
 759     add_cmd ("architecture", class_support, show_architecture,
 760              "Show the current target architecture", &showlist);
 761     c = add_cmd ("architecture", class_support, info_architecture,
 762                  "List supported target architectures", &infolist);
 763     deprecate_cmd (c, "set architecture");
 764   }
 765 }
 766
 767
 768 /* */
 769
 770 extern initialize_file_ftype _initialize_gdbarch_utils;
 771
 772 void
 773 _initialize_gdbarch_utils (void)
 774 {
 775   struct cmd_list_element *c;
 776   c = add_set_enum_cmd ("endian", class_support,
 777                         endian_enum, &set_endian_string,
 778                         "Set endianness of target.",
 779                         &setlist);
 780   c->function.sfunc = set_endian;
 781   /* Don't use set_from_show - need to print both auto/manual and
 782      current setting. */
 783   add_cmd ("endian", class_support, show_endian,
 784            "Show the current byte-order", &showlist);
 785 }