gdb/arch-utils.c

   1 /* Dynamic architecture support for GDB, the GNU debugger.
   2    Copyright 1998-1999, 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 <ctype.h>
  31 #include "symtab.h"
  32 #include "frame.h"
  33 #include "inferior.h"
  34 #include "breakpoint.h"
  35 #include "gdb_wait.h"
  36 #include "gdbcore.h"
  37 #include "gdbcmd.h"
  38 #include "target.h"
  39 #include "gdbthread.h"
  40 #include "annotate.h"
  41 #include "symfile.h"            /* for overlay functions */
  42 #endif
  43
  44 #include "version.h"
  45
  46 #include "floatformat.h"
  47
  48 /* Convenience macro for allocting typesafe memory. */
  49
  50 #ifndef XMALLOC
  51 #define XMALLOC(TYPE) (TYPE*) xmalloc (sizeof (TYPE))
  52 #endif
  53
  54
  55 /* Use the program counter to determine the contents and size
  56    of a breakpoint instruction.  If no target-dependent macro
  57    BREAKPOINT_FROM_PC has been defined to implement this function,
  58    assume that the breakpoint doesn't depend on the PC, and
  59    use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
  60    Return a pointer to a string of bytes that encode a breakpoint
  61    instruction, stores the length of the string to *lenptr,
  62    and optionally adjust the pc to point to the correct memory location
  63    for inserting the breakpoint.  */
  64
  65 unsigned char *
  66 legacy_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr)
  67 {
  68   /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
  69      breakpoint.  On some machines, breakpoints are handled by the
  70      target environment and we don't have to worry about them here.  */
  71 #ifdef BIG_BREAKPOINT
  72   if (TARGET_BYTE_ORDER == BIG_ENDIAN)
  73     {
  74       static unsigned char big_break_insn[] = BIG_BREAKPOINT;
  75       *lenptr = sizeof (big_break_insn);
  76       return big_break_insn;
  77     }
  78 #endif
  79 #ifdef LITTLE_BREAKPOINT
  80   if (TARGET_BYTE_ORDER != BIG_ENDIAN)
  81     {
  82       static unsigned char little_break_insn[] = LITTLE_BREAKPOINT;
  83       *lenptr = sizeof (little_break_insn);
  84       return little_break_insn;
  85     }
  86 #endif
  87 #ifdef BREAKPOINT
  88   {
  89     static unsigned char break_insn[] = BREAKPOINT;
  90     *lenptr = sizeof (break_insn);
  91     return break_insn;
  92   }
  93 #endif
  94   *lenptr = 0;
  95   return NULL;
  96 }
  97
  98 int
  99 generic_frameless_function_invocation_not (struct frame_info *fi)
 100 {
 101   return 0;
 102 }
 103
 104 int
 105 generic_return_value_on_stack_not (struct type *type)
 106 {
 107   return 0;
 108 }
 109
 110 char *
 111 legacy_register_name (int i)
 112 {
 113 #ifdef REGISTER_NAMES
 114   static char *names[] = REGISTER_NAMES;
 115   if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
 116     return NULL;
 117   else
 118     return names[i];
 119 #else
 120   internal_error ("legacy_register_name: called.");
 121   return NULL;
 122 #endif
 123 }
 124
 125 #if defined (CALL_DUMMY)
 126 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
 127 #else
 128 LONGEST legacy_call_dummy_words[1];
 129 #endif
 130 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
 131
 132 void
 133 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len,
 134                                        CORE_ADDR * rem_addr, int *rem_len)
 135 {
 136   *rem_addr = gdb_addr;
 137   *rem_len = gdb_len;
 138 }
 139
 140 int
 141 generic_prologue_frameless_p (CORE_ADDR ip)
 142 {
 143 #ifdef SKIP_PROLOGUE_FRAMELESS_P
 144   return ip == SKIP_PROLOGUE_FRAMELESS_P (ip);
 145 #else
 146   return ip == SKIP_PROLOGUE (ip);
 147 #endif
 148 }
 149
 150
 151 /* Helper functions for INNER_THAN */
 152
 153 int
 154 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 155 {
 156   return (lhs < rhs);
 157 }
 158
 159 int
 160 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 161 {
 162   return (lhs > rhs);
 163 }
 164
 165
 166 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 167
 168 const struct floatformat *
 169 default_float_format (struct gdbarch *gdbarch)
 170 {
 171 #if GDB_MULTI_ARCH
 172   int byte_order = gdbarch_byte_order (gdbarch);
 173 #else
 174   int byte_order = TARGET_BYTE_ORDER;
 175 #endif
 176   switch (byte_order)
 177     {
 178     case BIG_ENDIAN:
 179       return &floatformat_ieee_single_big;
 180     case LITTLE_ENDIAN:
 181       return &floatformat_ieee_single_little;
 182     default:
 183       internal_error ("default_float_format: bad byte order");
 184     }
 185 }
 186
 187
 188 const struct floatformat *
 189 default_double_format (struct gdbarch *gdbarch)
 190 {
 191 #if GDB_MULTI_ARCH
 192   int byte_order = gdbarch_byte_order (gdbarch);
 193 #else
 194   int byte_order = TARGET_BYTE_ORDER;
 195 #endif
 196   switch (byte_order)
 197     {
 198     case BIG_ENDIAN:
 199       return &floatformat_ieee_double_big;
 200     case LITTLE_ENDIAN:
 201       return &floatformat_ieee_double_little;
 202     default:
 203       internal_error ("default_double_format: bad byte order");
 204     }
 205 }
 206
 207 /* Misc helper functions for targets. */
 208
 209 int
 210 frame_num_args_unknown (struct frame_info *fi)
 211 {
 212   return -1;
 213 }
 214
 215
 216 int
 217 generic_register_convertible_not (int num)
 218 {
 219   return 0;
 220 }
 221
 222
 223 int
 224 default_register_sim_regno (int num)
 225 {
 226   return num;
 227 }
 228
 229
 230 CORE_ADDR
 231 default_convert_from_func_ptr_addr (CORE_ADDR addr)
 232 {
 233   return addr;
 234 }
 235
 236 /* Functions to manipulate the endianness of the target.  */
 237
 238 #ifdef TARGET_BYTE_ORDER_SELECTABLE
 239 /* compat - Catch old targets that expect a selectable byte-order to
 240    default to BIG_ENDIAN */
 241 #ifndef TARGET_BYTE_ORDER_DEFAULT
 242 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
 243 #endif
 244 #endif
 245 #if !TARGET_BYTE_ORDER_SELECTABLE_P
 246 #ifndef TARGET_BYTE_ORDER_DEFAULT
 247 /* compat - Catch old non byte-order selectable targets that do not
 248    define TARGET_BYTE_ORDER_DEFAULT and instead expect
 249    TARGET_BYTE_ORDER to be used as the default.  For targets that
 250    defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
 251    below will get a strange compiler warning. */
 252 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
 253 #endif
 254 #endif
 255 #ifndef TARGET_BYTE_ORDER_DEFAULT
 256 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
 257 #endif
 258 /* ``target_byte_order'' is only used when non- multi-arch.
 259    Multi-arch targets obtain the current byte order using
 260    TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
 261 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
 262 int target_byte_order_auto = 1;
 263
 264 static const char endian_big[] = "big";
 265 static const char endian_little[] = "little";
 266 static const char endian_auto[] = "auto";
 267 static const char *endian_enum[] =
 268 {
 269   endian_big,
 270   endian_little,
 271   endian_auto,
 272   NULL,
 273 };
 274 static const char *set_endian_string;
 275
 276 /* Called by ``show endian''.  */
 277
 278 static void
 279 show_endian (char *args, int from_tty)
 280 {
 281   if (TARGET_BYTE_ORDER_AUTO)
 282     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 283                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 284   else
 285     printf_unfiltered ("The target is assumed to be %s endian\n",
 286                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 287 }
 288
 289 static void
 290 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 291 {
 292   if (!TARGET_BYTE_ORDER_SELECTABLE_P)
 293     {
 294       printf_unfiltered ("Byte order is not selectable.");
 295     }
 296   else if (set_endian_string == endian_auto)
 297     {
 298       target_byte_order_auto = 1;
 299     }
 300   else if (set_endian_string == endian_little)
 301     {
 302       target_byte_order_auto = 0;
 303       if (GDB_MULTI_ARCH)
 304         {
 305           struct gdbarch_info info;
 306           memset (&info, 0, sizeof info);
 307           info.byte_order = LITTLE_ENDIAN;
 308           if (! gdbarch_update_p (info))
 309             {
 310               printf_unfiltered ("Little endian target not supported by GDB\n");
 311             }
 312         }
 313       else
 314         {
 315           target_byte_order = LITTLE_ENDIAN;
 316         }
 317     }
 318   else if (set_endian_string == endian_big)
 319     {
 320       target_byte_order_auto = 0;
 321       if (GDB_MULTI_ARCH)
 322         {
 323           struct gdbarch_info info;
 324           memset (&info, 0, sizeof info);
 325           info.byte_order = BIG_ENDIAN;
 326           if (! gdbarch_update_p (info))
 327             {
 328               printf_unfiltered ("Big endian target not supported by GDB\n");
 329             }
 330         }
 331       else
 332         {
 333           target_byte_order = BIG_ENDIAN;
 334         }
 335     }
 336   else
 337     internal_error ("set_endian: bad value");
 338   show_endian (NULL, from_tty);
 339 }
 340
 341 /* Set the endianness from a BFD.  */
 342
 343 static void
 344 set_endian_from_file (bfd *abfd)
 345 {
 346   if (GDB_MULTI_ARCH)
 347     internal_error ("set_endian_from_file: not for multi-arch");
 348   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 349     {
 350       int want;
 351
 352       if (bfd_big_endian (abfd))
 353         want = BIG_ENDIAN;
 354       else
 355         want = LITTLE_ENDIAN;
 356       if (TARGET_BYTE_ORDER_AUTO)
 357         target_byte_order = want;
 358       else if (TARGET_BYTE_ORDER != want)
 359         warning ("%s endian file does not match %s endian target.",
 360                  want == BIG_ENDIAN ? "big" : "little",
 361                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 362     }
 363   else
 364     {
 365       if (bfd_big_endian (abfd)
 366           ? TARGET_BYTE_ORDER != BIG_ENDIAN
 367           : TARGET_BYTE_ORDER == BIG_ENDIAN)
 368         warning ("%s endian file does not match %s endian target.",
 369                  bfd_big_endian (abfd) ? "big" : "little",
 370                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 371     }
 372 }
 373
 374
 375 /* Functions to manipulate the architecture of the target */
 376
 377 enum set_arch { set_arch_auto, set_arch_manual };
 378
 379 int target_architecture_auto = 1;
 380
 381 const char *set_architecture_string;
 382
 383 /* Old way of changing the current architecture. */
 384
 385 extern const struct bfd_arch_info bfd_default_arch_struct;
 386 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 387 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 388
 389 static int
 390 arch_ok (const struct bfd_arch_info *arch)
 391 {
 392   if (GDB_MULTI_ARCH)
 393     internal_error ("arch_ok: not multi-arched");
 394   /* Should be performing the more basic check that the binary is
 395      compatible with GDB. */
 396   /* Check with the target that the architecture is valid. */
 397   return (target_architecture_hook == NULL
 398           || target_architecture_hook (arch));
 399 }
 400
 401 static void
 402 set_arch (const struct bfd_arch_info *arch,
 403           enum set_arch type)
 404 {
 405   if (GDB_MULTI_ARCH)
 406     internal_error ("set_arch: not multi-arched");
 407   switch (type)
 408     {
 409     case set_arch_auto:
 410       if (!arch_ok (arch))
 411         warning ("Target may not support %s architecture",
 412                  arch->printable_name);
 413       target_architecture = arch;
 414       break;
 415     case set_arch_manual:
 416       if (!arch_ok (arch))
 417         {
 418           printf_unfiltered ("Target does not support `%s' architecture.\n",
 419                              arch->printable_name);
 420         }
 421       else
 422         {
 423           target_architecture_auto = 0;
 424           target_architecture = arch;
 425         }
 426       break;
 427     }
 428   if (gdbarch_debug)
 429     gdbarch_dump (current_gdbarch, gdb_stdlog);
 430 }
 431
 432 /* Set the architecture from arch/machine (deprecated) */
 433
 434 void
 435 set_architecture_from_arch_mach (enum bfd_architecture arch,
 436                                  unsigned long mach)
 437 {
 438   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 439   if (GDB_MULTI_ARCH)
 440     internal_error ("set_architecture_from_arch_mach: not multi-arched");
 441   if (wanted != NULL)
 442     set_arch (wanted, set_arch_manual);
 443   else
 444     internal_error ("gdbarch: hardwired architecture/machine not reconized");
 445 }
 446
 447 /* Set the architecture from a BFD (deprecated) */
 448
 449 static void
 450 set_architecture_from_file (bfd *abfd)
 451 {
 452   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 453   if (GDB_MULTI_ARCH)
 454     internal_error ("set_architecture_from_file: not multi-arched");
 455   if (target_architecture_auto)
 456     {
 457       set_arch (wanted, set_arch_auto);
 458     }
 459   else if (wanted != target_architecture)
 460     {
 461       warning ("%s architecture file may be incompatible with %s target.",
 462                wanted->printable_name,
 463                target_architecture->printable_name);
 464     }
 465 }
 466
 467
 468 /* Called if the user enters ``show architecture'' without an
 469    argument. */
 470
 471 static void
 472 show_architecture (char *args, int from_tty)
 473 {
 474   const char *arch;
 475   arch = TARGET_ARCHITECTURE->printable_name;
 476   if (target_architecture_auto)
 477     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 478   else
 479     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 480 }
 481
 482
 483 /* Called if the user enters ``set architecture'' with or without an
 484    argument. */
 485
 486 static void
 487 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 488 {
 489   if (strcmp (set_architecture_string, "auto") == 0)
 490     {
 491       target_architecture_auto = 1;
 492     }
 493   else if (GDB_MULTI_ARCH)
 494     {
 495       struct gdbarch_info info;
 496       memset (&info, 0, sizeof info);
 497       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 498       if (info.bfd_arch_info == NULL)
 499         internal_error ("set_architecture: bfd_scan_arch failed");
 500       if (gdbarch_update_p (info))
 501         target_architecture_auto = 0;
 502       else
 503         printf_unfiltered ("Architecture `%s' not reconized.\n",
 504                            set_architecture_string);
 505     }
 506   else
 507     {
 508       const struct bfd_arch_info *arch
 509         = bfd_scan_arch (set_architecture_string);
 510       if (arch == NULL)
 511         internal_error ("set_architecture: bfd_scan_arch failed");
 512       set_arch (arch, set_arch_manual);
 513     }
 514   show_architecture (NULL, from_tty);
 515 }
 516
 517 /* Called if the user enters ``info architecture'' without an argument. */
 518
 519 static void
 520 info_architecture (char *args, int from_tty)
 521 {
 522   printf_filtered ("Available architectures are:\n");
 523   if (GDB_MULTI_ARCH)
 524     {
 525       const char **arches = gdbarch_printable_names ();
 526       const char **arch;
 527       for (arch = arches; *arch != NULL; arch++)
 528         {
 529           printf_filtered (" %s", *arch);
 530         }
 531       free (arches);
 532     }
 533   else
 534     {
 535       enum bfd_architecture a;
 536       for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
 537         {
 538           const struct bfd_arch_info *ap;
 539           for (ap = bfd_lookup_arch (a, 0);
 540                ap != NULL;
 541                ap = ap->next)
 542             {
 543               printf_filtered (" %s", ap->printable_name);
 544               ap = ap->next;
 545             }
 546         }
 547     }
 548   printf_filtered ("\n");
 549 }
 550
 551 /* Set the dynamic target-system-dependent parameters (architecture,
 552    byte-order) using information found in the BFD */
 553
 554 void
 555 set_gdbarch_from_file (bfd *abfd)
 556 {
 557   if (GDB_MULTI_ARCH)
 558     {
 559       struct gdbarch_info info;
 560       memset (&info, 0, sizeof info);
 561       info.abfd = abfd;
 562       if (! gdbarch_update_p (info))
 563         error ("Architecture of file not reconized.\n");
 564     }
 565   else
 566     {
 567       set_architecture_from_file (abfd);
 568       set_endian_from_file (abfd);
 569     }
 570 }
 571
 572 /* Initialize the current architecture.  Update the ``set
 573    architecture'' command so that it specifies a list of valid
 574    architectures.  */
 575
 576 #ifdef DEFAULT_BFD_ARCH
 577 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 578 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 579 #else
 580 static const bfd_arch_info_type *default_bfd_arch;
 581 #endif
 582
 583 #ifdef DEFAULT_BFD_VEC
 584 extern const bfd_target DEFAULT_BFD_VEC;
 585 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 586 #else
 587 static const bfd_target *default_bfd_vec;
 588 #endif
 589
 590 void
 591 initialize_current_architecture (void)
 592 {
 593   const char **arches = gdbarch_printable_names ();
 594
 595   /* determine a default architecture and byte order. */
 596   struct gdbarch_info info;
 597   memset (&info, 0, sizeof (info));
 598
 599   /* Find a default architecture. */
 600   if (info.bfd_arch_info == NULL
 601       && default_bfd_arch != NULL)
 602     info.bfd_arch_info = default_bfd_arch;
 603   if (info.bfd_arch_info == NULL)
 604     {
 605       /* Choose the architecture by taking the first one
 606          alphabetically. */
 607       const char *chosen = arches[0];
 608       const char **arch;
 609       for (arch = arches; *arch != NULL; arch++)
 610         {
 611           if (strcmp (*arch, chosen) < 0)
 612             chosen = *arch;
 613         }
 614       if (chosen == NULL)
 615         internal_error ("initialize_current_architecture: No arch");
 616       info.bfd_arch_info = bfd_scan_arch (chosen);
 617       if (info.bfd_arch_info == NULL)
 618         internal_error ("initialize_current_architecture: Arch not found");
 619     }
 620
 621   /* take several guesses at a byte order. */
 622   /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
 623      forced above. */
 624   if (info.byte_order == 0
 625       && default_bfd_vec != NULL)
 626     {
 627       /* Extract BFD's default vector's byte order. */
 628       switch (default_bfd_vec->byteorder)
 629         {
 630         case BFD_ENDIAN_BIG:
 631           info.byte_order = BIG_ENDIAN;
 632           break;
 633         case BFD_ENDIAN_LITTLE:
 634           info.byte_order = LITTLE_ENDIAN;
 635           break;
 636         default:
 637           break;
 638         }
 639     }
 640   if (info.byte_order == 0)
 641     {
 642       /* look for ``*el-*'' in the target name. */
 643       const char *chp;
 644       chp = strchr (target_name, '-');
 645       if (chp != NULL
 646           && chp - 2 >= target_name
 647           && strncmp (chp - 2, "el", 2) == 0)
 648         info.byte_order = LITTLE_ENDIAN;
 649     }
 650   if (info.byte_order == 0)
 651     {
 652       /* Wire it to big-endian!!! */
 653       info.byte_order = BIG_ENDIAN;
 654     }
 655
 656   if (GDB_MULTI_ARCH)
 657     {
 658       if (! gdbarch_update_p (info))
 659         {
 660           internal_error ("initialize_current_architecture: Selection of initial architecture failed");
 661         }
 662     }
 663
 664   /* Create the ``set architecture'' command appending ``auto'' to the
 665      list of architectures. */
 666   {
 667     struct cmd_list_element *c;
 668     /* Append ``auto''. */
 669     int nr;
 670     for (nr = 0; arches[nr] != NULL; nr++);
 671     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 672     arches[nr + 0] = "auto";
 673     arches[nr + 1] = NULL;
 674     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 675        of ``const char *''.  We just happen to know that the casts are
 676        safe. */
 677     c = add_set_enum_cmd ("architecture", class_support,
 678                           arches, &set_architecture_string,
 679                           "Set architecture of target.",
 680                           &setlist);
 681     c->function.sfunc = set_architecture;
 682     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 683     /* Don't use set_from_show - need to print both auto/manual and
 684        current setting. */
 685     add_cmd ("architecture", class_support, show_architecture,
 686              "Show the current target architecture", &showlist);
 687     c = add_cmd ("architecture", class_support, info_architecture,
 688                  "List supported target architectures", &infolist);
 689     deprecate_cmd (c, "set architecture");
 690   }
 691 }
 692
 693
 694 /* */
 695
 696 extern initialize_file_ftype _initialize_gdbarch_utils;
 697
 698 void
 699 _initialize_gdbarch_utils (void)
 700 {
 701   struct cmd_list_element *c;
 702   c = add_set_enum_cmd ("endian", class_support,
 703                         endian_enum, &set_endian_string,
 704                         "Set endianness of target.",
 705                         &setlist);
 706   c->function.sfunc = set_endian;
 707   /* Don't use set_from_show - need to print both auto/manual and
 708      current setting. */
 709   add_cmd ("endian", class_support, show_endian,
 710            "Show the current byte-order", &showlist);
 711 }