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 int
 237 no_op_reg_to_regnum (int reg)
 238 {
 239   return reg;
 240 }
 241
 242 /* Functions to manipulate the endianness of the target.  */
 243
 244 #ifdef TARGET_BYTE_ORDER_SELECTABLE
 245 /* compat - Catch old targets that expect a selectable byte-order to
 246    default to BIG_ENDIAN */
 247 #ifndef TARGET_BYTE_ORDER_DEFAULT
 248 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
 249 #endif
 250 #endif
 251 #if !TARGET_BYTE_ORDER_SELECTABLE_P
 252 #ifndef TARGET_BYTE_ORDER_DEFAULT
 253 /* compat - Catch old non byte-order selectable targets that do not
 254    define TARGET_BYTE_ORDER_DEFAULT and instead expect
 255    TARGET_BYTE_ORDER to be used as the default.  For targets that
 256    defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
 257    below will get a strange compiler warning. */
 258 #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
 259 #endif
 260 #endif
 261 #ifndef TARGET_BYTE_ORDER_DEFAULT
 262 #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
 263 #endif
 264 /* ``target_byte_order'' is only used when non- multi-arch.
 265    Multi-arch targets obtain the current byte order using
 266    TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
 267 int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
 268 int target_byte_order_auto = 1;
 269
 270 static const char endian_big[] = "big";
 271 static const char endian_little[] = "little";
 272 static const char endian_auto[] = "auto";
 273 static const char *endian_enum[] =
 274 {
 275   endian_big,
 276   endian_little,
 277   endian_auto,
 278   NULL,
 279 };
 280 static const char *set_endian_string;
 281
 282 /* Called by ``show endian''.  */
 283
 284 static void
 285 show_endian (char *args, int from_tty)
 286 {
 287   if (TARGET_BYTE_ORDER_AUTO)
 288     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 289                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 290   else
 291     printf_unfiltered ("The target is assumed to be %s endian\n",
 292                        (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
 293 }
 294
 295 static void
 296 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 297 {
 298   if (!TARGET_BYTE_ORDER_SELECTABLE_P)
 299     {
 300       printf_unfiltered ("Byte order is not selectable.");
 301     }
 302   else if (set_endian_string == endian_auto)
 303     {
 304       target_byte_order_auto = 1;
 305     }
 306   else if (set_endian_string == endian_little)
 307     {
 308       target_byte_order_auto = 0;
 309       if (GDB_MULTI_ARCH)
 310         {
 311           struct gdbarch_info info;
 312           memset (&info, 0, sizeof info);
 313           info.byte_order = LITTLE_ENDIAN;
 314           if (! gdbarch_update_p (info))
 315             {
 316               printf_unfiltered ("Little endian target not supported by GDB\n");
 317             }
 318         }
 319       else
 320         {
 321           target_byte_order = LITTLE_ENDIAN;
 322         }
 323     }
 324   else if (set_endian_string == endian_big)
 325     {
 326       target_byte_order_auto = 0;
 327       if (GDB_MULTI_ARCH)
 328         {
 329           struct gdbarch_info info;
 330           memset (&info, 0, sizeof info);
 331           info.byte_order = BIG_ENDIAN;
 332           if (! gdbarch_update_p (info))
 333             {
 334               printf_unfiltered ("Big endian target not supported by GDB\n");
 335             }
 336         }
 337       else
 338         {
 339           target_byte_order = BIG_ENDIAN;
 340         }
 341     }
 342   else
 343     internal_error ("set_endian: bad value");
 344   show_endian (NULL, from_tty);
 345 }
 346
 347 /* Set the endianness from a BFD.  */
 348
 349 static void
 350 set_endian_from_file (bfd *abfd)
 351 {
 352   if (GDB_MULTI_ARCH)
 353     internal_error ("set_endian_from_file: not for multi-arch");
 354   if (TARGET_BYTE_ORDER_SELECTABLE_P)
 355     {
 356       int want;
 357
 358       if (bfd_big_endian (abfd))
 359         want = BIG_ENDIAN;
 360       else
 361         want = LITTLE_ENDIAN;
 362       if (TARGET_BYTE_ORDER_AUTO)
 363         target_byte_order = want;
 364       else if (TARGET_BYTE_ORDER != want)
 365         warning ("%s endian file does not match %s endian target.",
 366                  want == BIG_ENDIAN ? "big" : "little",
 367                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 368     }
 369   else
 370     {
 371       if (bfd_big_endian (abfd)
 372           ? TARGET_BYTE_ORDER != BIG_ENDIAN
 373           : TARGET_BYTE_ORDER == BIG_ENDIAN)
 374         warning ("%s endian file does not match %s endian target.",
 375                  bfd_big_endian (abfd) ? "big" : "little",
 376                  TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
 377     }
 378 }
 379
 380
 381 /* Functions to manipulate the architecture of the target */
 382
 383 enum set_arch { set_arch_auto, set_arch_manual };
 384
 385 int target_architecture_auto = 1;
 386
 387 const char *set_architecture_string;
 388
 389 /* Old way of changing the current architecture. */
 390
 391 extern const struct bfd_arch_info bfd_default_arch_struct;
 392 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 393 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 394
 395 static int
 396 arch_ok (const struct bfd_arch_info *arch)
 397 {
 398   if (GDB_MULTI_ARCH)
 399     internal_error ("arch_ok: not multi-arched");
 400   /* Should be performing the more basic check that the binary is
 401      compatible with GDB. */
 402   /* Check with the target that the architecture is valid. */
 403   return (target_architecture_hook == NULL
 404           || target_architecture_hook (arch));
 405 }
 406
 407 static void
 408 set_arch (const struct bfd_arch_info *arch,
 409           enum set_arch type)
 410 {
 411   if (GDB_MULTI_ARCH)
 412     internal_error ("set_arch: not multi-arched");
 413   switch (type)
 414     {
 415     case set_arch_auto:
 416       if (!arch_ok (arch))
 417         warning ("Target may not support %s architecture",
 418                  arch->printable_name);
 419       target_architecture = arch;
 420       break;
 421     case set_arch_manual:
 422       if (!arch_ok (arch))
 423         {
 424           printf_unfiltered ("Target does not support `%s' architecture.\n",
 425                              arch->printable_name);
 426         }
 427       else
 428         {
 429           target_architecture_auto = 0;
 430           target_architecture = arch;
 431         }
 432       break;
 433     }
 434   if (gdbarch_debug)
 435     gdbarch_dump (current_gdbarch, gdb_stdlog);
 436 }
 437
 438 /* Set the architecture from arch/machine (deprecated) */
 439
 440 void
 441 set_architecture_from_arch_mach (enum bfd_architecture arch,
 442                                  unsigned long mach)
 443 {
 444   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 445   if (GDB_MULTI_ARCH)
 446     internal_error ("set_architecture_from_arch_mach: not multi-arched");
 447   if (wanted != NULL)
 448     set_arch (wanted, set_arch_manual);
 449   else
 450     internal_error ("gdbarch: hardwired architecture/machine not recognized");
 451 }
 452
 453 /* Set the architecture from a BFD (deprecated) */
 454
 455 static void
 456 set_architecture_from_file (bfd *abfd)
 457 {
 458   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 459   if (GDB_MULTI_ARCH)
 460     internal_error ("set_architecture_from_file: not multi-arched");
 461   if (target_architecture_auto)
 462     {
 463       set_arch (wanted, set_arch_auto);
 464     }
 465   else if (wanted != target_architecture)
 466     {
 467       warning ("%s architecture file may be incompatible with %s target.",
 468                wanted->printable_name,
 469                target_architecture->printable_name);
 470     }
 471 }
 472
 473
 474 /* Called if the user enters ``show architecture'' without an
 475    argument. */
 476
 477 static void
 478 show_architecture (char *args, int from_tty)
 479 {
 480   const char *arch;
 481   arch = TARGET_ARCHITECTURE->printable_name;
 482   if (target_architecture_auto)
 483     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 484   else
 485     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 486 }
 487
 488
 489 /* Called if the user enters ``set architecture'' with or without an
 490    argument. */
 491
 492 static void
 493 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 494 {
 495   if (strcmp (set_architecture_string, "auto") == 0)
 496     {
 497       target_architecture_auto = 1;
 498     }
 499   else if (GDB_MULTI_ARCH)
 500     {
 501       struct gdbarch_info info;
 502       memset (&info, 0, sizeof info);
 503       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 504       if (info.bfd_arch_info == NULL)
 505         internal_error ("set_architecture: bfd_scan_arch failed");
 506       if (gdbarch_update_p (info))
 507         target_architecture_auto = 0;
 508       else
 509         printf_unfiltered ("Architecture `%s' not recognized.\n",
 510                            set_architecture_string);
 511     }
 512   else
 513     {
 514       const struct bfd_arch_info *arch
 515         = bfd_scan_arch (set_architecture_string);
 516       if (arch == NULL)
 517         internal_error ("set_architecture: bfd_scan_arch failed");
 518       set_arch (arch, set_arch_manual);
 519     }
 520   show_architecture (NULL, from_tty);
 521 }
 522
 523 /* Called if the user enters ``info architecture'' without an argument. */
 524
 525 static void
 526 info_architecture (char *args, int from_tty)
 527 {
 528   printf_filtered ("Available architectures are:\n");
 529   if (GDB_MULTI_ARCH)
 530     {
 531       const char **arches = gdbarch_printable_names ();
 532       const char **arch;
 533       for (arch = arches; *arch != NULL; arch++)
 534         {
 535           printf_filtered (" %s", *arch);
 536         }
 537       free (arches);
 538     }
 539   else
 540     {
 541       enum bfd_architecture a;
 542       for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
 543         {
 544           const struct bfd_arch_info *ap;
 545           for (ap = bfd_lookup_arch (a, 0);
 546                ap != NULL;
 547                ap = ap->next)
 548             {
 549               printf_filtered (" %s", ap->printable_name);
 550               ap = ap->next;
 551             }
 552         }
 553     }
 554   printf_filtered ("\n");
 555 }
 556
 557 /* Set the dynamic target-system-dependent parameters (architecture,
 558    byte-order) using information found in the BFD */
 559
 560 void
 561 set_gdbarch_from_file (bfd *abfd)
 562 {
 563   if (GDB_MULTI_ARCH)
 564     {
 565       struct gdbarch_info info;
 566       memset (&info, 0, sizeof info);
 567       info.abfd = abfd;
 568       if (! gdbarch_update_p (info))
 569         error ("Architecture of file not recognized.\n");
 570     }
 571   else
 572     {
 573       set_architecture_from_file (abfd);
 574       set_endian_from_file (abfd);
 575     }
 576 }
 577
 578 /* Initialize the current architecture.  Update the ``set
 579    architecture'' command so that it specifies a list of valid
 580    architectures.  */
 581
 582 #ifdef DEFAULT_BFD_ARCH
 583 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 584 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 585 #else
 586 static const bfd_arch_info_type *default_bfd_arch;
 587 #endif
 588
 589 #ifdef DEFAULT_BFD_VEC
 590 extern const bfd_target DEFAULT_BFD_VEC;
 591 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 592 #else
 593 static const bfd_target *default_bfd_vec;
 594 #endif
 595
 596 void
 597 initialize_current_architecture (void)
 598 {
 599   const char **arches = gdbarch_printable_names ();
 600
 601   /* determine a default architecture and byte order. */
 602   struct gdbarch_info info;
 603   memset (&info, 0, sizeof (info));
 604
 605   /* Find a default architecture. */
 606   if (info.bfd_arch_info == NULL
 607       && default_bfd_arch != NULL)
 608     info.bfd_arch_info = default_bfd_arch;
 609   if (info.bfd_arch_info == NULL)
 610     {
 611       /* Choose the architecture by taking the first one
 612          alphabetically. */
 613       const char *chosen = arches[0];
 614       const char **arch;
 615       for (arch = arches; *arch != NULL; arch++)
 616         {
 617           if (strcmp (*arch, chosen) < 0)
 618             chosen = *arch;
 619         }
 620       if (chosen == NULL)
 621         internal_error ("initialize_current_architecture: No arch");
 622       info.bfd_arch_info = bfd_scan_arch (chosen);
 623       if (info.bfd_arch_info == NULL)
 624         internal_error ("initialize_current_architecture: Arch not found");
 625     }
 626
 627   /* take several guesses at a byte order. */
 628   /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
 629      forced above. */
 630   if (info.byte_order == 0
 631       && default_bfd_vec != NULL)
 632     {
 633       /* Extract BFD's default vector's byte order. */
 634       switch (default_bfd_vec->byteorder)
 635         {
 636         case BFD_ENDIAN_BIG:
 637           info.byte_order = BIG_ENDIAN;
 638           break;
 639         case BFD_ENDIAN_LITTLE:
 640           info.byte_order = LITTLE_ENDIAN;
 641           break;
 642         default:
 643           break;
 644         }
 645     }
 646   if (info.byte_order == 0)
 647     {
 648       /* look for ``*el-*'' in the target name. */
 649       const char *chp;
 650       chp = strchr (target_name, '-');
 651       if (chp != NULL
 652           && chp - 2 >= target_name
 653           && strncmp (chp - 2, "el", 2) == 0)
 654         info.byte_order = LITTLE_ENDIAN;
 655     }
 656   if (info.byte_order == 0)
 657     {
 658       /* Wire it to big-endian!!! */
 659       info.byte_order = BIG_ENDIAN;
 660     }
 661
 662   if (GDB_MULTI_ARCH)
 663     {
 664       if (! gdbarch_update_p (info))
 665         {
 666           internal_error ("initialize_current_architecture: Selection of initial architecture failed");
 667         }
 668     }
 669
 670   /* Create the ``set architecture'' command appending ``auto'' to the
 671      list of architectures. */
 672   {
 673     struct cmd_list_element *c;
 674     /* Append ``auto''. */
 675     int nr;
 676     for (nr = 0; arches[nr] != NULL; nr++);
 677     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 678     arches[nr + 0] = "auto";
 679     arches[nr + 1] = NULL;
 680     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 681        of ``const char *''.  We just happen to know that the casts are
 682        safe. */
 683     c = add_set_enum_cmd ("architecture", class_support,
 684                           arches, &set_architecture_string,
 685                           "Set architecture of target.",
 686                           &setlist);
 687     c->function.sfunc = set_architecture;
 688     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 689     /* Don't use set_from_show - need to print both auto/manual and
 690        current setting. */
 691     add_cmd ("architecture", class_support, show_architecture,
 692              "Show the current target architecture", &showlist);
 693     c = add_cmd ("architecture", class_support, info_architecture,
 694                  "List supported target architectures", &infolist);
 695     deprecate_cmd (c, "set architecture");
 696   }
 697 }
 698
 699
 700 /* */
 701
 702 extern initialize_file_ftype _initialize_gdbarch_utils;
 703
 704 void
 705 _initialize_gdbarch_utils (void)
 706 {
 707   struct cmd_list_element *c;
 708   c = add_set_enum_cmd ("endian", class_support,
 709                         endian_enum, &set_endian_string,
 710                         "Set endianness of target.",
 711                         &setlist);
 712   c->function.sfunc = set_endian;
 713   /* Don't use set_from_show - need to print both auto/manual and
 714      current setting. */
 715   add_cmd ("endian", class_support, show_endian,
 716            "Show the current byte-order", &showlist);
 717 }