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
  41 #include "version.h"
  42
  43 #include "floatformat.h"
  44
  45 /* Use the program counter to determine the contents and size
  46    of a breakpoint instruction.  If no target-dependent macro
  47    BREAKPOINT_FROM_PC has been defined to implement this function,
  48    assume that the breakpoint doesn't depend on the PC, and
  49    use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
  50    Return a pointer to a string of bytes that encode a breakpoint
  51    instruction, stores the length of the string to *lenptr,
  52    and optionally adjust the pc to point to the correct memory location
  53    for inserting the breakpoint.  */
  54
  55 unsigned char *
  56 legacy_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr)
  57 {
  58   /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
  59      breakpoint.  On some machines, breakpoints are handled by the
  60      target environment and we don't have to worry about them here.  */
  61 #ifdef BIG_BREAKPOINT
  62   if (TARGET_BYTE_ORDER == BIG_ENDIAN)
  63     {
  64       static unsigned char big_break_insn[] = BIG_BREAKPOINT;
  65       *lenptr = sizeof (big_break_insn);
  66       return big_break_insn;
  67     }
  68 #endif
  69 #ifdef LITTLE_BREAKPOINT
  70   if (TARGET_BYTE_ORDER != BIG_ENDIAN)
  71     {
  72       static unsigned char little_break_insn[] = LITTLE_BREAKPOINT;
  73       *lenptr = sizeof (little_break_insn);
  74       return little_break_insn;
  75     }
  76 #endif
  77 #ifdef BREAKPOINT
  78   {
  79     static unsigned char break_insn[] = BREAKPOINT;
  80     *lenptr = sizeof (break_insn);
  81     return break_insn;
  82   }
  83 #endif
  84   *lenptr = 0;
  85   return NULL;
  86 }
  87
  88 int
  89 generic_frameless_function_invocation_not (struct frame_info *fi)
  90 {
  91   return 0;
  92 }
  93
  94 int
  95 generic_return_value_on_stack_not (struct type *type)
  96 {
  97   return 0;
  98 }
  99
 100 char *
 101 legacy_register_name (int i)
 102 {
 103 #ifdef REGISTER_NAMES
 104   static char *names[] = REGISTER_NAMES;
 105   if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
 106     return NULL;
 107   else
 108     return names[i];
 109 #else
 110   internal_error (__FILE__, __LINE__,
 111                   "legacy_register_name: called.");
 112   return NULL;
 113 #endif
 114 }
 115
 116 #if defined (CALL_DUMMY)
 117 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
 118 #else
 119 LONGEST legacy_call_dummy_words[1];
 120 #endif
 121 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
 122
 123 void
 124 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len,
 125                                        CORE_ADDR * rem_addr, int *rem_len)
 126 {
 127   *rem_addr = gdb_addr;
 128   *rem_len = gdb_len;
 129 }
 130
 131 int
 132 generic_prologue_frameless_p (CORE_ADDR ip)
 133 {
 134 #ifdef SKIP_PROLOGUE_FRAMELESS_P
 135   return ip == SKIP_PROLOGUE_FRAMELESS_P (ip);
 136 #else
 137   return ip == SKIP_PROLOGUE (ip);
 138 #endif
 139 }
 140
 141
 142 /* Helper functions for INNER_THAN */
 143
 144 int
 145 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 146 {
 147   return (lhs < rhs);
 148 }
 149
 150 int
 151 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 152 {
 153   return (lhs > rhs);
 154 }
 155
 156
 157 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 158
 159 const struct floatformat *
 160 default_float_format (struct gdbarch *gdbarch)
 161 {
 162 #if GDB_MULTI_ARCH
 163   int byte_order = gdbarch_byte_order (gdbarch);
 164 #else
 165   int byte_order = TARGET_BYTE_ORDER;
 166 #endif
 167   switch (byte_order)
 168     {
 169     case BIG_ENDIAN:
 170       return &floatformat_ieee_single_big;
 171     case LITTLE_ENDIAN:
 172       return &floatformat_ieee_single_little;
 173     default:
 174       internal_error (__FILE__, __LINE__,
 175                       "default_float_format: bad byte order");
 176     }
 177 }
 178
 179
 180 const struct floatformat *
 181 default_double_format (struct gdbarch *gdbarch)
 182 {
 183 #if GDB_MULTI_ARCH
 184   int byte_order = gdbarch_byte_order (gdbarch);
 185 #else
 186   int byte_order = TARGET_BYTE_ORDER;
 187 #endif
 188   switch (byte_order)
 189     {
 190     case BIG_ENDIAN:
 191       return &floatformat_ieee_double_big;
 192     case LITTLE_ENDIAN:
 193       return &floatformat_ieee_double_little;
 194     default:
 195       internal_error (__FILE__, __LINE__,
 196                       "default_double_format: bad byte order");
 197     }
 198 }
 199
 200 /* Misc helper functions for targets. */
 201
 202 int
 203 frame_num_args_unknown (struct frame_info *fi)
 204 {
 205   return -1;
 206 }
 207
 208
 209 int
 210 generic_register_convertible_not (int num)
 211 {
 212   return 0;
 213 }
 214
 215
 216 int
 217 default_register_sim_regno (int num)
 218 {
 219   return num;
 220 }
 221
 222
 223 CORE_ADDR
 224 default_convert_from_func_ptr_addr (CORE_ADDR addr)
 225 {
 226   return addr;
 227 }
 228
 229 int
 230 no_op_reg_to_regnum (int reg)
 231 {
 232   return reg;
 233 }
 234
 235 /* For use by frame_args_address and frame_locals_address.  */
 236 CORE_ADDR
 237 default_frame_address (struct frame_info *fi)
 238 {
 239   return fi->frame;
 240 }
 241
 242 /* Default prepare_to_procced().  */
 243 int
 244 default_prepare_to_proceed (int select_it)
 245 {
 246   return 0;
 247 }
 248
 249 /* Generic prepare_to_proceed().  This one should be suitable for most
 250    targets that support threads. */
 251 int
 252 generic_prepare_to_proceed (int select_it)
 253 {
 254   int wait_pid;
 255   struct target_waitstatus wait_status;
 256
 257   /* Get the last target status returned by target_wait().  */
 258   get_last_target_status (&wait_pid, &wait_status);
 259
 260   /* Make sure we were stopped at a breakpoint.  */
 261   if (wait_status.kind != TARGET_WAITKIND_STOPPED
 262       || wait_status.value.sig != TARGET_SIGNAL_TRAP)
 263     {
 264       return 0;
 265     }
 266
 267   if (wait_pid != -1 && inferior_pid != wait_pid)
 268     {
 269       /* Switched over from WAIT_PID.  */
 270       CORE_ADDR wait_pc = read_pc_pid (wait_pid);
 271
 272       /* Avoid switching where it wouldn't do any good, i.e. if both
 273          threads are at the same breakpoint.  */
 274       if (wait_pc != read_pc () && breakpoint_here_p (wait_pc))
 275         {
 276           if (select_it)
 277             {
 278               /* User hasn't deleted the breakpoint.  Switch back to
 279                  WAIT_PID and return non-zero.  */
 280               inferior_pid = wait_pid;
 281
 282               /* FIXME: This stuff came from switch_to_thread() in
 283                  thread.c (which should probably be a public function).  */
 284               flush_cached_frames ();
 285               registers_changed ();
 286               stop_pc = wait_pc;
 287               select_frame (get_current_frame (), 0);
 288             }
 289
 290           return 1;
 291         }
 292     }
 293   return 0;
 294
 295 }
 296
 297 /* Functions to manipulate the endianness of the target.  */
 298
 299 #ifdef TARGET_BYTE_ORDER_SELECTABLE
 300 /* compat - Catch old targets that expect a selectable byte-order to
 301    default to BIG_ENDIAN */
 302 #ifndef TARGET_BYTE_ORDER_DEFAULT
 303 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
 304 #endif
 305 #endif
 306 #if !TARGET_BYTE_ORDER_SELECTABLE_P
 307 #ifndef TARGET_BYTE_ORDER_DEFAULT
 308 /* compat - Catch old non byte-order selectable targets that do not
 309    define TARGET_BYTE_ORDER_DEFAULT and instead expect
 310    TARGET_BYTE_ORDER to be used as the default.  For targets that
 311    defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
 312    below will get a strange compiler warning. */
 313 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
 314 #endif
 315 #endif
 316 #ifndef TARGET_BYTE_ORDER_DEFAULT
 317 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
 318 #endif
 319 /* ``target_byte_order'' is only used when non- multi-arch.
 320    Multi-arch targets obtain the current byte order using
 321    TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
 322 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
 323 int target_byte_order_auto = 1;
 324
 325 static const char endian_big[] = "big";
 326 static const char endian_little[] = "little";
 327 static const char endian_auto[] = "auto";
 328 static const char *endian_enum[] =
 329 {
 330   endian_big,
 331   endian_little,
 332   endian_auto,
 333   NULL,
 334 };
 335 static const char *set_endian_string;
 336
 337 /* Called by ``show endian''.  */
 338
 339 static void
 340 show_endian (char *args, int from_tty)
 341 {
 342   if (TARGET_BYTE_ORDER_AUTO)
 343     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 344                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 345   else
 346     printf_unfiltered ("The target is assumed to be %s endian\n",
 347                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 348 }
 349
 350 static void
 351 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 352 {
 353   if (!TARGET_BYTE_ORDER_SELECTABLE_P)
 354     {
 355       printf_unfiltered ("Byte order is not selectable.");
 356     }
 357   else if (set_endian_string == endian_auto)
 358     {
 359       target_byte_order_auto = 1;
 360     }
 361   else if (set_endian_string == endian_little)
 362     {
 363       target_byte_order_auto = 0;
 364       if (GDB_MULTI_ARCH)
 365         {
 366           struct gdbarch_info info;
 367           memset (&info, 0, sizeof info);
 368           info.byte_order = LITTLE_ENDIAN;
 369           if (! gdbarch_update_p (info))
 370             {
 371               printf_unfiltered ("Little endian target not supported by GDB\n");
 372             }
 373         }
 374       else
 375         {
 376           target_byte_order = LITTLE_ENDIAN;
 377         }
 378     }
 379   else if (set_endian_string == endian_big)
 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 = BIG_ENDIAN;
 387           if (! gdbarch_update_p (info))
 388             {
 389               printf_unfiltered ("Big endian target not supported by GDB\n");
 390             }
 391         }
 392       else
 393         {
 394           target_byte_order = BIG_ENDIAN;
 395         }
 396     }
 397   else
 398     internal_error (__FILE__, __LINE__,
 399                     "set_endian: bad value");
 400   show_endian (NULL, from_tty);
 401 }
 402
 403 /* Set the endianness from a BFD.  */
 404
 405 static void
 406 set_endian_from_file (bfd *abfd)
 407 {
 408   if (GDB_MULTI_ARCH)
 409     internal_error (__FILE__, __LINE__,
 410                     "set_endian_from_file: not for multi-arch");
 411   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 412     {
 413       int want;
 414
 415       if (bfd_big_endian (abfd))
 416         want = BIG_ENDIAN;
 417       else
 418         want = LITTLE_ENDIAN;
 419       if (TARGET_BYTE_ORDER_AUTO)
 420         target_byte_order = want;
 421       else if (TARGET_BYTE_ORDER != want)
 422         warning ("%s endian file does not match %s endian target.",
 423                  want == BIG_ENDIAN ? "big" : "little",
 424                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 425     }
 426   else
 427     {
 428       if (bfd_big_endian (abfd)
 429           ? TARGET_BYTE_ORDER != BIG_ENDIAN
 430           : TARGET_BYTE_ORDER == BIG_ENDIAN)
 431         warning ("%s endian file does not match %s endian target.",
 432                  bfd_big_endian (abfd) ? "big" : "little",
 433                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 434     }
 435 }
 436
 437
 438 /* Functions to manipulate the architecture of the target */
 439
 440 enum set_arch { set_arch_auto, set_arch_manual };
 441
 442 int target_architecture_auto = 1;
 443
 444 const char *set_architecture_string;
 445
 446 /* Old way of changing the current architecture. */
 447
 448 extern const struct bfd_arch_info bfd_default_arch_struct;
 449 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 450 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 451
 452 static int
 453 arch_ok (const struct bfd_arch_info *arch)
 454 {
 455   if (GDB_MULTI_ARCH)
 456     internal_error (__FILE__, __LINE__,
 457                     "arch_ok: not multi-arched");
 458   /* Should be performing the more basic check that the binary is
 459      compatible with GDB. */
 460   /* Check with the target that the architecture is valid. */
 461   return (target_architecture_hook == NULL
 462           || target_architecture_hook (arch));
 463 }
 464
 465 static void
 466 set_arch (const struct bfd_arch_info *arch,
 467           enum set_arch type)
 468 {
 469   if (GDB_MULTI_ARCH)
 470     internal_error (__FILE__, __LINE__,
 471                     "set_arch: not multi-arched");
 472   switch (type)
 473     {
 474     case set_arch_auto:
 475       if (!arch_ok (arch))
 476         warning ("Target may not support %s architecture",
 477                  arch->printable_name);
 478       target_architecture = arch;
 479       break;
 480     case set_arch_manual:
 481       if (!arch_ok (arch))
 482         {
 483           printf_unfiltered ("Target does not support `%s' architecture.\n",
 484                              arch->printable_name);
 485         }
 486       else
 487         {
 488           target_architecture_auto = 0;
 489           target_architecture = arch;
 490         }
 491       break;
 492     }
 493   if (gdbarch_debug)
 494     gdbarch_dump (current_gdbarch, gdb_stdlog);
 495 }
 496
 497 /* Set the architecture from arch/machine (deprecated) */
 498
 499 void
 500 set_architecture_from_arch_mach (enum bfd_architecture arch,
 501                                  unsigned long mach)
 502 {
 503   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 504   if (GDB_MULTI_ARCH)
 505     internal_error (__FILE__, __LINE__,
 506                     "set_architecture_from_arch_mach: not multi-arched");
 507   if (wanted != NULL)
 508     set_arch (wanted, set_arch_manual);
 509   else
 510     internal_error (__FILE__, __LINE__,
 511                     "gdbarch: hardwired architecture/machine not recognized");
 512 }
 513
 514 /* Set the architecture from a BFD (deprecated) */
 515
 516 static void
 517 set_architecture_from_file (bfd *abfd)
 518 {
 519   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 520   if (GDB_MULTI_ARCH)
 521     internal_error (__FILE__, __LINE__,
 522                     "set_architecture_from_file: not multi-arched");
 523   if (target_architecture_auto)
 524     {
 525       set_arch (wanted, set_arch_auto);
 526     }
 527   else if (wanted != target_architecture)
 528     {
 529       warning ("%s architecture file may be incompatible with %s target.",
 530                wanted->printable_name,
 531                target_architecture->printable_name);
 532     }
 533 }
 534
 535
 536 /* Called if the user enters ``show architecture'' without an
 537    argument. */
 538
 539 static void
 540 show_architecture (char *args, int from_tty)
 541 {
 542   const char *arch;
 543   arch = TARGET_ARCHITECTURE->printable_name;
 544   if (target_architecture_auto)
 545     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 546   else
 547     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 548 }
 549
 550
 551 /* Called if the user enters ``set architecture'' with or without an
 552    argument. */
 553
 554 static void
 555 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 556 {
 557   if (strcmp (set_architecture_string, "auto") == 0)
 558     {
 559       target_architecture_auto = 1;
 560     }
 561   else if (GDB_MULTI_ARCH)
 562     {
 563       struct gdbarch_info info;
 564       memset (&info, 0, sizeof info);
 565       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 566       if (info.bfd_arch_info == NULL)
 567         internal_error (__FILE__, __LINE__,
 568                         "set_architecture: bfd_scan_arch failed");
 569       if (gdbarch_update_p (info))
 570         target_architecture_auto = 0;
 571       else
 572         printf_unfiltered ("Architecture `%s' not recognized.\n",
 573                            set_architecture_string);
 574     }
 575   else
 576     {
 577       const struct bfd_arch_info *arch
 578         = bfd_scan_arch (set_architecture_string);
 579       if (arch == NULL)
 580         internal_error (__FILE__, __LINE__,
 581                         "set_architecture: bfd_scan_arch failed");
 582       set_arch (arch, set_arch_manual);
 583     }
 584   show_architecture (NULL, from_tty);
 585 }
 586
 587 /* Called if the user enters ``info architecture'' without an argument. */
 588
 589 static void
 590 info_architecture (char *args, int from_tty)
 591 {
 592   printf_filtered ("Available architectures are:\n");
 593   if (GDB_MULTI_ARCH)
 594     {
 595       const char **arches = gdbarch_printable_names ();
 596       const char **arch;
 597       for (arch = arches; *arch != NULL; arch++)
 598         {
 599           printf_filtered (" %s", *arch);
 600         }
 601       xfree (arches);
 602     }
 603   else
 604     {
 605       enum bfd_architecture a;
 606       for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
 607         {
 608           const struct bfd_arch_info *ap;
 609           for (ap = bfd_lookup_arch (a, 0);
 610                ap != NULL;
 611                ap = ap->next)
 612             {
 613               printf_filtered (" %s", ap->printable_name);
 614               ap = ap->next;
 615             }
 616         }
 617     }
 618   printf_filtered ("\n");
 619 }
 620
 621 /* Set the dynamic target-system-dependent parameters (architecture,
 622    byte-order) using information found in the BFD */
 623
 624 void
 625 set_gdbarch_from_file (bfd *abfd)
 626 {
 627   if (GDB_MULTI_ARCH)
 628     {
 629       struct gdbarch_info info;
 630       memset (&info, 0, sizeof info);
 631       info.abfd = abfd;
 632       if (! gdbarch_update_p (info))
 633         error ("Architecture of file not recognized.\n");
 634     }
 635   else
 636     {
 637       set_architecture_from_file (abfd);
 638       set_endian_from_file (abfd);
 639     }
 640 }
 641
 642 /* Initialize the current architecture.  Update the ``set
 643    architecture'' command so that it specifies a list of valid
 644    architectures.  */
 645
 646 #ifdef DEFAULT_BFD_ARCH
 647 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 648 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 649 #else
 650 static const bfd_arch_info_type *default_bfd_arch;
 651 #endif
 652
 653 #ifdef DEFAULT_BFD_VEC
 654 extern const bfd_target DEFAULT_BFD_VEC;
 655 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 656 #else
 657 static const bfd_target *default_bfd_vec;
 658 #endif
 659
 660 void
 661 initialize_current_architecture (void)
 662 {
 663   const char **arches = gdbarch_printable_names ();
 664
 665   /* determine a default architecture and byte order. */
 666   struct gdbarch_info info;
 667   memset (&info, 0, sizeof (info));
 668
 669   /* Find a default architecture. */
 670   if (info.bfd_arch_info == NULL
 671       && default_bfd_arch != NULL)
 672     info.bfd_arch_info = default_bfd_arch;
 673   if (info.bfd_arch_info == NULL)
 674     {
 675       /* Choose the architecture by taking the first one
 676          alphabetically. */
 677       const char *chosen = arches[0];
 678       const char **arch;
 679       for (arch = arches; *arch != NULL; arch++)
 680         {
 681           if (strcmp (*arch, chosen) < 0)
 682             chosen = *arch;
 683         }
 684       if (chosen == NULL)
 685         internal_error (__FILE__, __LINE__,
 686                         "initialize_current_architecture: No arch");
 687       info.bfd_arch_info = bfd_scan_arch (chosen);
 688       if (info.bfd_arch_info == NULL)
 689         internal_error (__FILE__, __LINE__,
 690                         "initialize_current_architecture: Arch not found");
 691     }
 692
 693   /* take several guesses at a byte order. */
 694   /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
 695      forced above. */
 696   if (info.byte_order == 0
 697       && default_bfd_vec != NULL)
 698     {
 699       /* Extract BFD's default vector's byte order. */
 700       switch (default_bfd_vec->byteorder)
 701         {
 702         case BFD_ENDIAN_BIG:
 703           info.byte_order = BIG_ENDIAN;
 704           break;
 705         case BFD_ENDIAN_LITTLE:
 706           info.byte_order = LITTLE_ENDIAN;
 707           break;
 708         default:
 709           break;
 710         }
 711     }
 712   if (info.byte_order == 0)
 713     {
 714       /* look for ``*el-*'' in the target name. */
 715       const char *chp;
 716       chp = strchr (target_name, '-');
 717       if (chp != NULL
 718           && chp - 2 >= target_name
 719           && strncmp (chp - 2, "el", 2) == 0)
 720         info.byte_order = LITTLE_ENDIAN;
 721     }
 722   if (info.byte_order == 0)
 723     {
 724       /* Wire it to big-endian!!! */
 725       info.byte_order = BIG_ENDIAN;
 726     }
 727
 728   if (GDB_MULTI_ARCH)
 729     {
 730       if (! gdbarch_update_p (info))
 731         {
 732           internal_error (__FILE__, __LINE__,
 733                           "initialize_current_architecture: Selection of initial architecture failed");
 734         }
 735     }
 736
 737   /* Create the ``set architecture'' command appending ``auto'' to the
 738      list of architectures. */
 739   {
 740     struct cmd_list_element *c;
 741     /* Append ``auto''. */
 742     int nr;
 743     for (nr = 0; arches[nr] != NULL; nr++);
 744     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 745     arches[nr + 0] = "auto";
 746     arches[nr + 1] = NULL;
 747     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 748        of ``const char *''.  We just happen to know that the casts are
 749        safe. */
 750     c = add_set_enum_cmd ("architecture", class_support,
 751                           arches, &set_architecture_string,
 752                           "Set architecture of target.",
 753                           &setlist);
 754     c->function.sfunc = set_architecture;
 755     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 756     /* Don't use set_from_show - need to print both auto/manual and
 757        current setting. */
 758     add_cmd ("architecture", class_support, show_architecture,
 759              "Show the current target architecture", &showlist);
 760     c = add_cmd ("architecture", class_support, info_architecture,
 761                  "List supported target architectures", &infolist);
 762     deprecate_cmd (c, "set architecture");
 763   }
 764 }
 765
 766
 767 /* */
 768
 769 extern initialize_file_ftype _initialize_gdbarch_utils;
 770
 771 void
 772 _initialize_gdbarch_utils (void)
 773 {
 774   struct cmd_list_element *c;
 775   c = add_set_enum_cmd ("endian", class_support,
 776                         endian_enum, &set_endian_string,
 777                         "Set endianness of target.",
 778                         &setlist);
 779   c->function.sfunc = set_endian;
 780   /* Don't use set_from_show - need to print both auto/manual and
 781      current setting. */
 782   add_cmd ("endian", class_support, show_endian,
 783            "Show the current byte-order", &showlist);
 784 }