debugger/defs.h

   1 /* Basic, host-specific, and target-specific definitions for GDB.
   2    Copyright (C) 1986, 1989, 1991 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #if !defined (DEFS_H)
  21 #define DEFS_H 1
  22
  23 #include <stdio.h>
  24
  25 /* First include ansidecl.h so we can use the various macro definitions
  26    here and in all subsequent file inclusions.  */
  27
  28 #include "ansidecl.h"
  29
  30 /* An address in the program being debugged.  Host byte order.  */
  31 typedef unsigned int CORE_ADDR;
  32
  33 #define min(a, b) ((a) < (b) ? (a) : (b))
  34 #define max(a, b) ((a) > (b) ? (a) : (b))
  35
  36 /* The character C++ uses to build identifiers that must be unique from
  37    the program's identifiers (such as $this and $$vptr).  */
  38 #define CPLUS_MARKER '$'        /* May be overridden to '.' for SysV */
  39
  40 #include <errno.h>              /* System call error return status */
  41
  42 extern int quit_flag;
  43 extern int immediate_quit;
  44
  45 extern void
  46 quit PARAMS ((void));
  47
  48 #define QUIT { if (quit_flag) quit (); }
  49
  50 /* Command classes are top-level categories into which commands are broken
  51    down for "help" purposes.
  52    Notes on classes: class_alias is for alias commands which are not
  53    abbreviations of the original command.  class-pseudo is for commands
  54    which are not really commands nor help topics ("stop").  */
  55
  56 enum command_class
  57 {
  58   /* Special args to help_list */
  59   all_classes = -2, all_commands = -1,
  60   /* Classes of commands */
  61   no_class = -1, class_run = 0, class_vars, class_stack,
  62   class_files, class_support, class_info, class_breakpoint,
  63   class_alias, class_obscure, class_user, class_maintenance,
  64   class_pseudo
  65 };
  66
  67 /* the cleanup list records things that have to be undone
  68    if an error happens (descriptors to be closed, memory to be freed, etc.)
  69    Each link in the chain records a function to call and an
  70    argument to give it.
  71
  72    Use make_cleanup to add an element to the cleanup chain.
  73    Use do_cleanups to do all cleanup actions back to a given
  74    point in the chain.  Use discard_cleanups to remove cleanups
  75    from the chain back to a given point, not doing them.  */
  76
  77 struct cleanup
  78 {
  79   struct cleanup *next;
  80   void (*function) PARAMS ((PTR));
  81   PTR arg;
  82 };
  83
  84 /* From blockframe.c */
  85
  86 extern int
  87 inside_entry_func PARAMS ((CORE_ADDR));
  88
  89 extern int
  90 inside_entry_file PARAMS ((CORE_ADDR addr));
  91
  92 extern int
  93 inside_main_func PARAMS ((CORE_ADDR pc));
  94
  95 /* From cplus-dem.c */
  96
  97 extern char *
  98 cplus_demangle PARAMS ((const char *, int));
  99
 100 extern char *
 101 cplus_mangle_opname PARAMS ((char *, int));
 102
 103 /* From libmmalloc.a (memory mapped malloc library) */
 104
 105 extern PTR
 106 mmalloc_attach PARAMS ((int, PTR));
 107
 108 extern PTR
 109 mmalloc_detach PARAMS ((PTR));
 110
 111 extern PTR
 112 mmalloc PARAMS ((PTR, long));
 113
 114 extern PTR
 115 mrealloc PARAMS ((PTR, PTR, long));
 116
 117 extern void
 118 mfree PARAMS ((PTR, PTR));
 119
 120 extern int
 121 mmalloc_setkey PARAMS ((PTR, int, PTR));
 122
 123 extern PTR
 124 mmalloc_getkey PARAMS ((PTR, int));
 125
 126 /* From utils.c */
 127
 128 extern char *
 129 demangle_and_match PARAMS ((const char *, const char *, int));
 130
 131 extern int
 132 strcmp_iw PARAMS ((const char *, const char *));
 133
 134 extern char *
 135 safe_strerror PARAMS ((int));
 136
 137 extern char *
 138 safe_strsignal PARAMS ((int));
 139
 140 extern void
 141 init_malloc PARAMS ((PTR));
 142
 143 extern void
 144 request_quit PARAMS ((int));
 145
 146 extern void
 147 do_cleanups PARAMS ((struct cleanup *));
 148
 149 extern void
 150 discard_cleanups PARAMS ((struct cleanup *));
 151
 152 /* The bare make_cleanup function is one of those rare beasts that
 153    takes almost any type of function as the first arg and anything that
 154    will fit in a "void *" as the second arg.
 155
 156    Should be, once all calls and called-functions are cleaned up:
 157 extern struct cleanup *
 158 make_cleanup PARAMS ((void (*function) (PTR), PTR));
 159
 160    Until then, lint and/or various type-checking compiler options will
 161    complain about make_cleanup calls.  It'd be wrong to just cast things,
 162    since the type actually passed when the function is called would be
 163    wrong.  */
 164
 165 extern struct cleanup *
 166 make_cleanup ();
 167
 168 extern struct cleanup *
 169 save_cleanups PARAMS ((void));
 170
 171 extern void
 172 restore_cleanups PARAMS ((struct cleanup *));
 173
 174 extern void
 175 free_current_contents PARAMS ((char **));
 176
 177 extern void
 178 null_cleanup PARAMS ((char **));
 179
 180 extern int
 181 myread PARAMS ((int, char *, int));
 182
 183 extern int
 184 query ();
 185
 186 extern void
 187 wrap_here PARAMS ((char *));
 188
 189 extern void
 190 reinitialize_more_filter PARAMS ((void));
 191
 192 extern int
 193 print_insn PARAMS ((CORE_ADDR, CORE_ADDR, FILE *, int));
 194
 195 extern void
 196 fputs_filtered PARAMS ((const char *, FILE *));
 197
 198 extern void
 199 puts_filtered PARAMS ((char *));
 200
 201 extern void
 202 vfprintf_filtered ();
 203
 204 extern void
 205 fprintf_filtered ();
 206
 207 extern void
 208 fprintfi_filtered ();
 209
 210 extern void
 211 printf_filtered ();
 212
 213 extern void
 214 printfi_filtered ();
 215
 216 extern void
 217 print_spaces PARAMS ((int, FILE *));
 218
 219 extern void
 220 print_spaces_filtered PARAMS ((int, FILE *));
 221
 222 extern char *
 223 n_spaces PARAMS ((int));
 224
 225 extern void
 226 printchar PARAMS ((int, FILE *, int));
 227
 228 extern char *
 229 strdup_demangled PARAMS ((const char *));
 230
 231 extern void
 232 fprint_symbol PARAMS ((FILE *, char *));
 233
 234 extern void
 235 fputs_demangled PARAMS ((char *, FILE *, int));
 236
 237 extern void
 238 perror_with_name PARAMS ((char *));
 239
 240 extern void
 241 print_sys_errmsg PARAMS ((char *, int));
 242
 243 /* From regex.c */
 244
 245 extern char *
 246 re_comp PARAMS ((char *));
 247
 248 /* From symfile.c */
 249
 250 extern void
 251 symbol_file_command PARAMS ((char *, int));
 252
 253 /* From main.c */
 254
 255 extern char *
 256 skip_quoted PARAMS ((char *));
 257
 258 extern char *
 259 gdb_readline PARAMS ((char *));
 260
 261 extern char *
 262 command_line_input PARAMS ((char *, int));
 263
 264 extern void
 265 print_prompt PARAMS ((void));
 266
 267 extern int
 268 batch_mode PARAMS ((void));
 269
 270 extern int
 271 input_from_terminal_p PARAMS ((void));
 272
 273 extern int
 274 catch_errors PARAMS ((int (*) (char *), char *, char *));
 275
 276 /* From printcmd.c */
 277
 278 extern void
 279 set_next_address PARAMS ((CORE_ADDR));
 280
 281 extern void
 282 print_address_symbolic PARAMS ((CORE_ADDR, FILE *, int, char *));
 283
 284 extern void
 285 print_address PARAMS ((CORE_ADDR, FILE *));
 286
 287 /* From source.c */
 288
 289 extern int
 290 openp PARAMS ((char *, int, char *, int, int, char **));
 291
 292 extern void
 293 mod_path PARAMS ((char *, char **));
 294
 295 extern void
 296 directory_command PARAMS ((char *, int));
 297
 298 extern void
 299 init_source_path PARAMS ((void));
 300
 301 /* From findvar.c */
 302
 303 extern int
 304 read_relative_register_raw_bytes PARAMS ((int, char *));
 305
 306 /* From readline (but not in any readline .h files).  */
 307
 308 extern char *
 309 tilde_expand PARAMS ((char *));
 310
 311 /* Structure for saved commands lines
 312    (for breakpoints, defined commands, etc).  */
 313
 314 struct command_line
 315 {
 316   struct command_line *next;
 317   char *line;
 318 };
 319
 320 extern struct command_line *
 321 read_command_lines PARAMS ((void));
 322
 323 extern void
 324 free_command_lines PARAMS ((struct command_line **));
 325
 326 /* String containing the current directory (what getwd would return).  */
 327
 328 extern char *current_directory;
 329
 330 /* Default radixes for input and output.  Only some values supported.  */
 331 extern unsigned input_radix;
 332 extern unsigned output_radix;
 333
 334 /* Baud rate specified for communication with serial target systems.  */
 335 extern char *baud_rate;
 336
 337 /* Languages represented in the symbol table and elsewhere. */
 338
 339 enum language
 340 {
 341    language_unknown,            /* Language not known */
 342    language_auto,               /* Placeholder for automatic setting */
 343    language_c,                  /* C */
 344    language_cplus,              /* C++ */
 345    language_m2                  /* Modula-2 */
 346 };
 347
 348 /* Return a format string for printf that will print a number in the local
 349    (language-specific) hexadecimal format.  Result is static and is
 350    overwritten by the next call.  local_hex_format_custom takes printf
 351    options like "08" or "l" (to produce e.g. %08x or %lx).  */
 352
 353 #define local_hex_format() (current_language->la_hex_format)
 354
 355 extern char *
 356 local_hex_format_custom PARAMS ((char *));      /* language.c */
 357
 358 /* Return a string that contains a number formatted in the local
 359    (language-specific) hexadecimal format.  Result is static and is
 360    overwritten by the next call.  local_hex_string_custom takes printf
 361    options like "08" or "l".  */
 362
 363 extern char *
 364 local_hex_string PARAMS ((int));                /* language.c */
 365
 366 extern char *
 367 local_hex_string_custom PARAMS ((int, char *)); /* language.c */
 368
 369 \f
 370 /* Host machine definition.  This will be a symlink to one of the
 371    xm-*.h files, built by the `configure' script.  */
 372
 373 #include "xm.h"
 374
 375 /* If the xm.h file did not define the mode string used to open the
 376    files, assume that binary files are opened the same way as text
 377    files */
 378 #ifndef FOPEN_RB
 379 #include "fopen-same.h"
 380 #endif
 381
 382 /*
 383  * Allow things in gdb to be declared "const".  If compiling ANSI, it
 384  * just works.  If compiling with gcc but non-ansi, redefine to __const__.
 385  * If non-ansi, non-gcc, then eliminate "const" entirely, making those
 386  * objects be read-write rather than read-only.
 387  */
 388
 389 #ifndef const
 390 #ifndef __STDC__
 391 # ifdef __GNUC__
 392 #  define const __const__
 393 # else
 394 #  define const /*nothing*/
 395 # endif /* GNUC */
 396 #endif /* STDC */
 397 #endif /* const */
 398
 399 #ifndef volatile
 400 #ifndef __STDC__
 401 # ifdef __GNUC__
 402 #  define volatile __volatile__
 403 # else
 404 #  define volatile /*nothing*/
 405 # endif /* GNUC */
 406 #endif /* STDC */
 407 #endif /* volatile */
 408
 409 /* Some compilers (many AT&T SVR4 compilers for instance), do not accept
 410    declarations of functions that never return (exit for instance) as
 411    "volatile void".  For such compilers "NORETURN" can be defined away
 412    to keep them happy */
 413
 414 #ifndef NORETURN
 415 # ifdef __lucid
 416 #   define NORETURN /*nothing*/
 417 # else
 418 #   define NORETURN volatile
 419 # endif
 420 #endif
 421
 422 /* Defaults for system-wide constants (if not defined by xm.h, we fake it).  */
 423
 424 #if !defined (UINT_MAX)
 425 #define UINT_MAX 0xffffffff
 426 #endif
 427
 428 #if !defined (LONG_MAX)
 429 #define LONG_MAX 0x7fffffff
 430 #endif
 431
 432 #if !defined (INT_MAX)
 433 #define INT_MAX 0x7fffffff
 434 #endif
 435
 436 #if !defined (INT_MIN)
 437 /* Two's complement, 32 bit.  */
 438 #define INT_MIN -0x80000000
 439 #endif
 440
 441 /* Number of bits in a char or unsigned char for the target machine.
 442    Just like CHAR_BIT in <limits.h> but describes the target machine.  */
 443 #if !defined (TARGET_CHAR_BIT)
 444 #define TARGET_CHAR_BIT 8
 445 #endif
 446
 447 /* Number of bits in a short or unsigned short for the target machine. */
 448 #if !defined (TARGET_SHORT_BIT)
 449 #define TARGET_SHORT_BIT (sizeof (short) * TARGET_CHAR_BIT)
 450 #endif
 451
 452 /* Number of bits in an int or unsigned int for the target machine. */
 453 #if !defined (TARGET_INT_BIT)
 454 #define TARGET_INT_BIT (sizeof (int) * TARGET_CHAR_BIT)
 455 #endif
 456
 457 /* Number of bits in a long or unsigned long for the target machine. */
 458 #if !defined (TARGET_LONG_BIT)
 459 #define TARGET_LONG_BIT (sizeof (long) * TARGET_CHAR_BIT)
 460 #endif
 461
 462 /* Number of bits in a long long or unsigned long long for the target machine. */
 463 #if !defined (TARGET_LONG_LONG_BIT)
 464 #define TARGET_LONG_LONG_BIT (2 * TARGET_LONG_BIT)
 465 #endif
 466
 467 /* Number of bits in a float for the target machine. */
 468 #if !defined (TARGET_FLOAT_BIT)
 469 #define TARGET_FLOAT_BIT (sizeof (float) * TARGET_CHAR_BIT)
 470 #endif
 471
 472 /* Number of bits in a double for the target machine. */
 473 #if !defined (TARGET_DOUBLE_BIT)
 474 #define TARGET_DOUBLE_BIT (sizeof (double) * TARGET_CHAR_BIT)
 475 #endif
 476
 477 /* Number of bits in a long double for the target machine. */
 478 #if !defined (TARGET_LONG_DOUBLE_BIT)
 479 #define TARGET_LONG_DOUBLE_BIT (2 * TARGET_DOUBLE_BIT)
 480 #endif
 481
 482 /* Number of bits in a "complex" for the target machine. */
 483 #if !defined (TARGET_COMPLEX_BIT)
 484 #define TARGET_COMPLEX_BIT (2 * TARGET_FLOAT_BIT)
 485 #endif
 486
 487 /* Number of bits in a "double complex" for the target machine. */
 488 #if !defined (TARGET_DOUBLE_COMPLEX_BIT)
 489 #define TARGET_DOUBLE_COMPLEX_BIT (2 * TARGET_DOUBLE_BIT)
 490 #endif
 491
 492 /* Number of bits in a pointer for the target machine */
 493 #if !defined (TARGET_PTR_BIT)
 494 #define TARGET_PTR_BIT TARGET_INT_BIT
 495 #endif
 496
 497 /* Convert a LONGEST to an int.  This is used in contexts (e.g. number
 498    of arguments to a function, number in a value history, register
 499    number, etc.) where the value must not be larger than can fit
 500    in an int.  */
 501 #if !defined (longest_to_int)
 502 #if defined (LONG_LONG)
 503 #define longest_to_int(x) (((x) > INT_MAX || (x) < INT_MIN) \
 504                            ? (error ("Value out of range."),0) : (int) (x))
 505 #else /* No LONG_LONG.  */
 506 /* Assume sizeof (int) == sizeof (long).  */
 507 #define longest_to_int(x) ((int) (x))
 508 #endif /* No LONG_LONG.  */
 509 #endif /* No longest_to_int.  */
 510
 511 /* This should not be a typedef, because "unsigned LONGEST" needs
 512    to work. LONG_LONG is defined if the host has "long long".  */
 513
 514 #ifndef LONGEST
 515 # ifdef LONG_LONG
 516 #  define LONGEST long long
 517 # else
 518 #  define LONGEST long
 519 # endif
 520 #endif
 521
 522 /* Assorted functions we can declare, now that const and volatile are
 523    defined.  */
 524
 525 extern char *
 526 savestring PARAMS ((const char *, int));
 527
 528 extern char *
 529 msavestring PARAMS ((void *, const char *, int));
 530
 531 extern char *
 532 strsave PARAMS ((const char *));
 533
 534 extern char *
 535 mstrsave PARAMS ((void *, const char *));
 536
 537 extern char *
 538 concat PARAMS ((char *, ...));
 539
 540 extern PTR
 541 xmalloc PARAMS ((long));
 542
 543 extern PTR
 544 xrealloc PARAMS ((PTR, long));
 545
 546 extern PTR
 547 xmmalloc PARAMS ((PTR, long));
 548
 549 extern PTR
 550 xmrealloc PARAMS ((PTR, PTR, long));
 551
 552 extern PTR
 553 mmalloc PARAMS ((PTR, long));
 554
 555 extern PTR
 556 mrealloc PARAMS ((PTR, PTR, long));
 557
 558 extern void
 559 mfree PARAMS ((PTR, PTR));
 560
 561 extern int
 562 mmcheck PARAMS ((PTR, void (*) (void)));
 563
 564 extern int
 565 mmtrace PARAMS ((void));
 566
 567 extern int
 568 parse_escape PARAMS ((char **));
 569
 570 extern const char * const reg_names[];
 571
 572 extern NORETURN void                    /* Does not return to the caller.  */
 573 error ();
 574
 575 extern NORETURN void                    /* Does not return to the caller.  */
 576 fatal ();
 577
 578 extern NORETURN void                    /* Not specified as volatile in ... */
 579 exit PARAMS ((int));                    /* 4.10.4.3 */
 580
 581 extern NORETURN void                    /* Does not return to the caller.  */
 582 nomem PARAMS ((long));
 583
 584 extern NORETURN void                    /* Does not return to the caller.  */
 585 return_to_top_level PARAMS ((void));
 586
 587 extern void
 588 warning_setup PARAMS ((void));
 589
 590 extern void
 591 warning ();
 592
 593 /* Global functions from other, non-gdb GNU thingies (libiberty for
 594    instance) */
 595
 596 extern char *
 597 basename PARAMS ((char *));
 598
 599 extern char *
 600 getenv PARAMS ((const char *));
 601
 602 extern char **
 603 buildargv PARAMS ((char *));
 604
 605 extern void
 606 freeargv PARAMS ((char **));
 607
 608 extern char *
 609 strerrno PARAMS ((int));
 610
 611 extern char *
 612 strsigno PARAMS ((int));
 613
 614 extern int
 615 errno_max PARAMS ((void));
 616
 617 extern int
 618 signo_max PARAMS ((void));
 619
 620 extern int
 621 strtoerrno PARAMS ((char *));
 622
 623 extern int
 624 strtosigno PARAMS ((char *));
 625
 626 extern char *
 627 strsignal PARAMS ((int));
 628
 629 /* From other system libraries */
 630
 631 #ifndef PSIGNAL_IN_SIGNAL_H
 632 extern void
 633 psignal PARAMS ((unsigned, char *));
 634 #endif
 635
 636 /* For now, we can't include <stdlib.h> because it conflicts with
 637    "../include/getopt.h".  (FIXME)
 638
 639    However, if a function is defined in the ANSI C standard and a prototype
 640    for that function is defined and visible in any header file in an ANSI
 641    conforming environment, then that prototype must match the definition in
 642    the ANSI standard.  So we can just duplicate them here without conflict,
 643    since they must be the same in all conforming ANSI environments.  If
 644    these cause problems, then the environment is not ANSI conformant. */
 645
 646 #ifdef __STDC__
 647 #include <stddef.h>
 648 #endif
 649
 650 extern int
 651 fclose PARAMS ((FILE *stream));                         /* 4.9.5.1 */
 652
 653 extern void
 654 perror PARAMS ((const char *));                         /* 4.9.10.4 */
 655
 656 extern double
 657 atof PARAMS ((const char *nptr));                       /* 4.10.1.1 */
 658
 659 extern int
 660 atoi PARAMS ((const char *));                           /* 4.10.1.2 */
 661
 662 #ifndef MALLOC_INCOMPATIBLE
 663
 664 extern PTR
 665 malloc PARAMS ((size_t size));                          /* 4.10.3.3 */
 666
 667 extern PTR
 668 realloc PARAMS ((void *ptr, size_t size));              /* 4.10.3.4 */
 669
 670 extern void
 671 free PARAMS ((void *));                                 /* 4.10.3.2 */
 672
 673 #endif  /* MALLOC_INCOMPATIBLE */
 674
 675 extern void
 676 qsort PARAMS ((void *base, size_t nmemb,                /* 4.10.5.2 */
 677                size_t size,
 678                int (*comp)(const void *, const void *)));
 679
 680 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 681 extern PTR
 682 memcpy PARAMS ((void *, const void *, size_t));         /* 4.11.2.1 */
 683 #endif
 684
 685 extern int
 686 memcmp PARAMS ((const void *, const void *, size_t));   /* 4.11.4.1 */
 687
 688 extern char *
 689 strchr PARAMS ((const char *, int));                    /* 4.11.5.2 */
 690
 691 extern char *
 692 strrchr PARAMS ((const char *, int));                   /* 4.11.5.5 */
 693
 694 extern char *
 695 strstr PARAMS ((const char *, const char *));           /* 4.11.5.7 */
 696
 697 extern char *
 698 strtok PARAMS ((char *, const char *));                 /* 4.11.5.8 */
 699
 700 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 701 extern PTR
 702 memset PARAMS ((void *, int, size_t));                  /* 4.11.6.1 */
 703 #endif
 704
 705 extern char *
 706 strerror PARAMS ((int));                                /* 4.11.6.2 */
 707
 708 /* Various possibilities for alloca.  */
 709 #ifndef alloca
 710 # ifdef __GNUC__
 711 #  define alloca __builtin_alloca
 712 # else
 713 #  ifdef sparc
 714 #   include <alloca.h>          /* NOTE:  Doesn't declare alloca() */
 715 #  endif
 716 #  ifdef __STDC__
 717    extern void *alloca (size_t);
 718 #  else /* __STDC__ */
 719    extern char *alloca ();
 720 #  endif
 721 # endif
 722 #endif
 723
 724 /* TARGET_BYTE_ORDER and HOST_BYTE_ORDER must be defined to one of these.  */
 725
 726 #if !defined (BIG_ENDIAN)
 727 #define BIG_ENDIAN 4321
 728 #endif
 729
 730 #if !defined (LITTLE_ENDIAN)
 731 #define LITTLE_ENDIAN 1234
 732 #endif
 733
 734 /* Target-system-dependent parameters for GDB.
 735
 736    The standard thing is to include defs.h.  However, files that are
 737    specific to a particular target can define TM_FILE_OVERRIDE before
 738    including defs.h, then can include any particular tm-file they desire.  */
 739
 740 /* Target machine definition.  This will be a symlink to one of the
 741    tm-*.h files, built by the `configure' script.  */
 742
 743 #ifndef TM_FILE_OVERRIDE
 744 #include "tm.h"
 745 #endif
 746
 747 /* The bit byte-order has to do just with numbering of bits in
 748    debugging symbols and such.  Conceptually, it's quite separate
 749    from byte/word byte order.  */
 750
 751 #if !defined (BITS_BIG_ENDIAN)
 752 #if TARGET_BYTE_ORDER == BIG_ENDIAN
 753 #define BITS_BIG_ENDIAN 1
 754 #endif /* Big endian.  */
 755
 756 #if TARGET_BYTE_ORDER == LITTLE_ENDIAN
 757 #define BITS_BIG_ENDIAN 0
 758 #endif /* Little endian.  */
 759 #endif /* BITS_BIG_ENDIAN not defined.  */
 760
 761 /* Swap LEN bytes at BUFFER between target and host byte-order.  */
 762 #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
 763 #define SWAP_TARGET_AND_HOST(buffer,len)
 764 #else /* Target and host byte order differ.  */
 765 #define SWAP_TARGET_AND_HOST(buffer,len) \
 766   {                                                                      \
 767     char tmp;                                                            \
 768     char *p = (char *)(buffer);                                          \
 769     char *q = ((char *)(buffer)) + len - 1;                              \
 770     for (; p < q; p++, q--)                                              \
 771       {                                                                  \
 772         tmp = *q;                                                        \
 773         *q = *p;                                                         \
 774         *p = tmp;                                                        \
 775       }                                                                  \
 776   }
 777 #endif /* Target and host byte order differ.  */
 778
 779 /* On some machines there are bits in addresses which are not really
 780    part of the address, but are used by the kernel, the hardware, etc.
 781    for special purposes.  ADDR_BITS_REMOVE takes out any such bits
 782    so we get a "real" address such as one would find in a symbol
 783    table.  ADDR_BITS_SET sets those bits the way the system wants
 784    them.  */
 785 #if !defined (ADDR_BITS_REMOVE)
 786 #define ADDR_BITS_REMOVE(addr) (addr)
 787 #define ADDR_BITS_SET(addr) (addr)
 788 #endif /* No ADDR_BITS_REMOVE.  */
 789
 790 /* From valops.c */
 791
 792 extern CORE_ADDR
 793 push_bytes PARAMS ((CORE_ADDR, char *, int));
 794
 795 /* In some modules, we don't have a definition of REGISTER_TYPE yet, so we
 796    must avoid prototyping this function for now.  FIXME.  Should be:
 797 extern CORE_ADDR
 798 push_word PARAMS ((CORE_ADDR, REGISTER_TYPE));
 799  */
 800 extern CORE_ADDR
 801 push_word ();
 802
 803 /* Some parts of gdb might be considered optional, in the sense that they
 804    are not essential for being able to build a working, usable debugger
 805    for a specific environment.  For example, the maintenance commands
 806    are there for the benefit of gdb maintainers.  As another example,
 807    some environments really don't need gdb's that are able to read N
 808    different object file formats.  In order to make it possible (but
 809    not necessarily recommended) to build "stripped down" versions of
 810    gdb, the following defines control selective compilation of those
 811    parts of gdb which can be safely left out when necessary.  Note that
 812    the default is to include everything. */
 813
 814 #ifndef MAINTENANCE_CMDS
 815 #define MAINTENANCE_CMDS 1
 816 #endif
 817
 818 #endif /* !defined (DEFS_H) */