gdb/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 /* Gdb does *lots* of string compares.  Use macros to speed them up by
  37    avoiding function calls if the first characters are not the same. */
  38
  39 #define STRCMP(a,b) (*(a) == *(b) ? strcmp ((a), (b)) : *(a) - *(b))
  40 #define STREQ(a,b) (*(a) == *(b) ? !strcmp ((a), (b)) : 0)
  41 #define STREQN(a,b,c) (*(a) == *(b) ? !strncmp ((a), (b), (c)) : 0)
  42
  43 /* The character C++ uses to build identifiers that must be unique from
  44    the program's identifiers (such as $this and $$vptr).  */
  45 #define CPLUS_MARKER '$'        /* May be overridden to '.' for SysV */
  46
  47 #include <errno.h>              /* System call error return status */
  48
  49 extern int quit_flag;
  50 extern int immediate_quit;
  51 extern int sevenbit_strings;
  52
  53 extern void
  54 quit PARAMS ((void));
  55
  56 #define QUIT { if (quit_flag) quit (); }
  57
  58 /* Command classes are top-level categories into which commands are broken
  59    down for "help" purposes.
  60    Notes on classes: class_alias is for alias commands which are not
  61    abbreviations of the original command.  class-pseudo is for commands
  62    which are not really commands nor help topics ("stop").  */
  63
  64 enum command_class
  65 {
  66   /* Special args to help_list */
  67   all_classes = -2, all_commands = -1,
  68   /* Classes of commands */
  69   no_class = -1, class_run = 0, class_vars, class_stack,
  70   class_files, class_support, class_info, class_breakpoint,
  71   class_alias, class_obscure, class_user, class_maintenance,
  72   class_pseudo
  73 };
  74
  75 /* the cleanup list records things that have to be undone
  76    if an error happens (descriptors to be closed, memory to be freed, etc.)
  77    Each link in the chain records a function to call and an
  78    argument to give it.
  79
  80    Use make_cleanup to add an element to the cleanup chain.
  81    Use do_cleanups to do all cleanup actions back to a given
  82    point in the chain.  Use discard_cleanups to remove cleanups
  83    from the chain back to a given point, not doing them.  */
  84
  85 struct cleanup
  86 {
  87   struct cleanup *next;
  88   void (*function) PARAMS ((PTR));
  89   PTR arg;
  90 };
  91
  92 /* From blockframe.c */
  93
  94 extern int
  95 inside_entry_func PARAMS ((CORE_ADDR));
  96
  97 extern int
  98 inside_entry_file PARAMS ((CORE_ADDR addr));
  99
 100 extern int
 101 inside_main_func PARAMS ((CORE_ADDR pc));
 102
 103 /* From libiberty.a */
 104
 105 extern char *
 106 cplus_demangle PARAMS ((const char *, int));
 107
 108 extern char *
 109 cplus_mangle_opname PARAMS ((char *, int));
 110
 111 /* From libmmalloc.a (memory mapped malloc library) */
 112
 113 extern PTR
 114 mmalloc_attach PARAMS ((int, PTR));
 115
 116 extern PTR
 117 mmalloc_detach PARAMS ((PTR));
 118
 119 extern PTR
 120 mmalloc PARAMS ((PTR, long));
 121
 122 extern PTR
 123 mrealloc PARAMS ((PTR, PTR, long));
 124
 125 extern void
 126 mfree PARAMS ((PTR, PTR));
 127
 128 extern int
 129 mmalloc_setkey PARAMS ((PTR, int, PTR));
 130
 131 extern PTR
 132 mmalloc_getkey PARAMS ((PTR, int));
 133
 134 /* From utils.c */
 135
 136 extern int
 137 strcmp_iw PARAMS ((const char *, const char *));
 138
 139 extern char *
 140 safe_strerror PARAMS ((int));
 141
 142 extern char *
 143 safe_strsignal PARAMS ((int));
 144
 145 extern void
 146 init_malloc PARAMS ((PTR));
 147
 148 extern void
 149 request_quit PARAMS ((int));
 150
 151 extern void
 152 do_cleanups PARAMS ((struct cleanup *));
 153
 154 extern void
 155 discard_cleanups PARAMS ((struct cleanup *));
 156
 157 /* The bare make_cleanup function is one of those rare beasts that
 158    takes almost any type of function as the first arg and anything that
 159    will fit in a "void *" as the second arg.
 160
 161    Should be, once all calls and called-functions are cleaned up:
 162 extern struct cleanup *
 163 make_cleanup PARAMS ((void (*function) (PTR), PTR));
 164
 165    Until then, lint and/or various type-checking compiler options will
 166    complain about make_cleanup calls.  It'd be wrong to just cast things,
 167    since the type actually passed when the function is called would be
 168    wrong.  */
 169
 170 extern struct cleanup *
 171 make_cleanup ();
 172
 173 extern struct cleanup *
 174 save_cleanups PARAMS ((void));
 175
 176 extern void
 177 restore_cleanups PARAMS ((struct cleanup *));
 178
 179 extern void
 180 free_current_contents PARAMS ((char **));
 181
 182 extern void
 183 null_cleanup PARAMS ((char **));
 184
 185 extern int
 186 myread PARAMS ((int, char *, int));
 187
 188 extern int
 189 query ();
 190
 191 extern void
 192 begin_line PARAMS ((void));
 193
 194 extern void
 195 wrap_here PARAMS ((char *));
 196
 197 extern void
 198 reinitialize_more_filter PARAMS ((void));
 199
 200 extern int
 201 print_insn PARAMS ((CORE_ADDR, FILE *));
 202
 203 extern void
 204 fputs_filtered PARAMS ((const char *, FILE *));
 205
 206 extern void
 207 puts_filtered PARAMS ((char *));
 208
 209 extern void
 210 vprintf_filtered ();
 211
 212 extern void
 213 vfprintf_filtered ();
 214
 215 extern void
 216 fprintf_filtered ();
 217
 218 extern void
 219 fprintfi_filtered ();
 220
 221 extern void
 222 printf_filtered ();
 223
 224 extern void
 225 printfi_filtered ();
 226
 227 extern void
 228 print_spaces PARAMS ((int, FILE *));
 229
 230 extern void
 231 print_spaces_filtered PARAMS ((int, FILE *));
 232
 233 extern char *
 234 n_spaces PARAMS ((int));
 235
 236 extern void
 237 gdb_printchar PARAMS ((int, FILE *, int));
 238
 239 extern char *
 240 strdup_demangled PARAMS ((const char *));
 241
 242 extern void
 243 fprint_symbol PARAMS ((FILE *, char *));
 244
 245 extern void
 246 fputs_demangled PARAMS ((char *, FILE *, int));
 247
 248 extern void
 249 perror_with_name PARAMS ((char *));
 250
 251 extern void
 252 print_sys_errmsg PARAMS ((char *, int));
 253
 254 /* From regex.c */
 255
 256 extern char *
 257 re_comp PARAMS ((char *));
 258
 259 /* From symfile.c */
 260
 261 extern void
 262 symbol_file_command PARAMS ((char *, int));
 263
 264 /* From main.c */
 265
 266 extern char *
 267 skip_quoted PARAMS ((char *));
 268
 269 extern char *
 270 gdb_readline PARAMS ((char *));
 271
 272 extern char *
 273 command_line_input PARAMS ((char *, int));
 274
 275 extern void
 276 print_prompt PARAMS ((void));
 277
 278 extern int
 279 batch_mode PARAMS ((void));
 280
 281 extern int
 282 input_from_terminal_p PARAMS ((void));
 283
 284 extern int
 285 catch_errors PARAMS ((int (*) (char *), char *, char *));
 286
 287 /* From printcmd.c */
 288
 289 extern void
 290 set_next_address PARAMS ((CORE_ADDR));
 291
 292 extern void
 293 print_address_symbolic PARAMS ((CORE_ADDR, FILE *, int, char *));
 294
 295 extern void
 296 print_address PARAMS ((CORE_ADDR, FILE *));
 297
 298 /* From source.c */
 299
 300 extern int
 301 openp PARAMS ((char *, int, char *, int, int, char **));
 302
 303 extern void
 304 mod_path PARAMS ((char *, char **));
 305
 306 extern void
 307 directory_command PARAMS ((char *, int));
 308
 309 extern void
 310 init_source_path PARAMS ((void));
 311
 312 /* From findvar.c */
 313
 314 extern int
 315 read_relative_register_raw_bytes PARAMS ((int, char *));
 316
 317 /* From readline (but not in any readline .h files).  */
 318
 319 extern char *
 320 tilde_expand PARAMS ((char *));
 321
 322 /* Structure for saved commands lines
 323    (for breakpoints, defined commands, etc).  */
 324
 325 struct command_line
 326 {
 327   struct command_line *next;
 328   char *line;
 329 };
 330
 331 extern struct command_line *
 332 read_command_lines PARAMS ((void));
 333
 334 extern void
 335 free_command_lines PARAMS ((struct command_line **));
 336
 337 /* String containing the current directory (what getwd would return).  */
 338
 339 extern char *current_directory;
 340
 341 /* Default radixes for input and output.  Only some values supported.  */
 342 extern unsigned input_radix;
 343 extern unsigned output_radix;
 344
 345 /* Baud rate specified for communication with serial target systems.  */
 346 extern char *baud_rate;
 347
 348 /* Languages represented in the symbol table and elsewhere.
 349    This should probably be in language.h, but since enum's can't
 350    be forward declared to satisfy opaque references before their
 351    actual definition, needs to be here. */
 352
 353 enum language
 354 {
 355    language_unknown,            /* Language not known */
 356    language_auto,               /* Placeholder for automatic setting */
 357    language_c,                  /* C */
 358    language_cplus,              /* C++ */
 359                                 /* start-sanitize-chill */
 360    language_chill,              /* Chill */
 361                                 /* end-sanitize-chill */
 362    language_m2                  /* Modula-2 */
 363 };
 364
 365 /* Possibilities for prettyprint parameters to routines which print
 366    things.  Like enum language, this should be in value.h, but needs
 367    to be here for the same reason.  FIXME:  If we can eliminate this
 368    as an arg to LA_VAL_PRINT, then we can probably move it back to
 369    value.h. */
 370
 371 enum val_prettyprint
 372 {
 373   Val_no_prettyprint = 0,
 374   Val_prettyprint,
 375   /* Use the default setting which the user has specified.  */
 376   Val_pretty_default
 377 };
 378
 379 \f
 380 /* Host machine definition.  This will be a symlink to one of the
 381    xm-*.h files, built by the `configure' script.  */
 382
 383 #include "xm.h"
 384
 385 /* Native machine support.  This will be a symlink to one of the
 386    nm-*.h files, built by the `configure' script.  */
 387
 388 #include "nm.h"
 389
 390 /* If the xm.h file did not define the mode string used to open the
 391    files, assume that binary files are opened the same way as text
 392    files */
 393 #ifndef FOPEN_RB
 394 #include "fopen-same.h"
 395 #endif
 396
 397 /*
 398  * Allow things in gdb to be declared "const".  If compiling ANSI, it
 399  * just works.  If compiling with gcc but non-ansi, redefine to __const__.
 400  * If non-ansi, non-gcc, then eliminate "const" entirely, making those
 401  * objects be read-write rather than read-only.
 402  */
 403
 404 #ifndef const
 405 #ifndef __STDC__
 406 # ifdef __GNUC__
 407 #  define const __const__
 408 # else
 409 #  define const /*nothing*/
 410 # endif /* GNUC */
 411 #endif /* STDC */
 412 #endif /* const */
 413
 414 #ifndef volatile
 415 #ifndef __STDC__
 416 # ifdef __GNUC__
 417 #  define volatile __volatile__
 418 # else
 419 #  define volatile /*nothing*/
 420 # endif /* GNUC */
 421 #endif /* STDC */
 422 #endif /* volatile */
 423
 424 /* Some compilers (many AT&T SVR4 compilers for instance), do not accept
 425    declarations of functions that never return (exit for instance) as
 426    "volatile void".  For such compilers "NORETURN" can be defined away
 427    to keep them happy */
 428
 429 #ifndef NORETURN
 430 # ifdef __lucid
 431 #   define NORETURN /*nothing*/
 432 # else
 433 #   define NORETURN volatile
 434 # endif
 435 #endif
 436
 437 /* Defaults for system-wide constants (if not defined by xm.h, we fake it).  */
 438
 439 #if !defined (UINT_MAX)
 440 #define UINT_MAX 0xffffffff
 441 #endif
 442
 443 #if !defined (LONG_MAX)
 444 #define LONG_MAX 0x7fffffff
 445 #endif
 446
 447 #if !defined (INT_MAX)
 448 #define INT_MAX 0x7fffffff
 449 #endif
 450
 451 #if !defined (INT_MIN)
 452 /* Two's complement, 32 bit.  */
 453 #define INT_MIN -0x80000000
 454 #endif
 455
 456 /* Number of bits in a char or unsigned char for the target machine.
 457    Just like CHAR_BIT in <limits.h> but describes the target machine.  */
 458 #if !defined (TARGET_CHAR_BIT)
 459 #define TARGET_CHAR_BIT 8
 460 #endif
 461
 462 /* Number of bits in a short or unsigned short for the target machine. */
 463 #if !defined (TARGET_SHORT_BIT)
 464 #define TARGET_SHORT_BIT (sizeof (short) * TARGET_CHAR_BIT)
 465 #endif
 466
 467 /* Number of bits in an int or unsigned int for the target machine. */
 468 #if !defined (TARGET_INT_BIT)
 469 #define TARGET_INT_BIT (sizeof (int) * TARGET_CHAR_BIT)
 470 #endif
 471
 472 /* Number of bits in a long or unsigned long for the target machine. */
 473 #if !defined (TARGET_LONG_BIT)
 474 #define TARGET_LONG_BIT (sizeof (long) * TARGET_CHAR_BIT)
 475 #endif
 476
 477 /* Number of bits in a long long or unsigned long long for the target machine. */
 478 #if !defined (TARGET_LONG_LONG_BIT)
 479 #define TARGET_LONG_LONG_BIT (2 * TARGET_LONG_BIT)
 480 #endif
 481
 482 /* Number of bits in a float for the target machine. */
 483 #if !defined (TARGET_FLOAT_BIT)
 484 #define TARGET_FLOAT_BIT (sizeof (float) * TARGET_CHAR_BIT)
 485 #endif
 486
 487 /* Number of bits in a double for the target machine. */
 488 #if !defined (TARGET_DOUBLE_BIT)
 489 #define TARGET_DOUBLE_BIT (sizeof (double) * TARGET_CHAR_BIT)
 490 #endif
 491
 492 /* Number of bits in a long double for the target machine. */
 493 #if !defined (TARGET_LONG_DOUBLE_BIT)
 494 #define TARGET_LONG_DOUBLE_BIT (2 * TARGET_DOUBLE_BIT)
 495 #endif
 496
 497 /* Number of bits in a "complex" for the target machine. */
 498 #if !defined (TARGET_COMPLEX_BIT)
 499 #define TARGET_COMPLEX_BIT (2 * TARGET_FLOAT_BIT)
 500 #endif
 501
 502 /* Number of bits in a "double complex" for the target machine. */
 503 #if !defined (TARGET_DOUBLE_COMPLEX_BIT)
 504 #define TARGET_DOUBLE_COMPLEX_BIT (2 * TARGET_DOUBLE_BIT)
 505 #endif
 506
 507 /* Number of bits in a pointer for the target machine */
 508 #if !defined (TARGET_PTR_BIT)
 509 #define TARGET_PTR_BIT TARGET_INT_BIT
 510 #endif
 511
 512 /* Convert a LONGEST to an int.  This is used in contexts (e.g. number
 513    of arguments to a function, number in a value history, register
 514    number, etc.) where the value must not be larger than can fit
 515    in an int.  */
 516 #if !defined (longest_to_int)
 517 #if defined (LONG_LONG)
 518 #define longest_to_int(x) (((x) > INT_MAX || (x) < INT_MIN) \
 519                            ? (error ("Value out of range."),0) : (int) (x))
 520 #else /* No LONG_LONG.  */
 521 /* Assume sizeof (int) == sizeof (long).  */
 522 #define longest_to_int(x) ((int) (x))
 523 #endif /* No LONG_LONG.  */
 524 #endif /* No longest_to_int.  */
 525
 526 /* This should not be a typedef, because "unsigned LONGEST" needs
 527    to work. LONG_LONG is defined if the host has "long long".  */
 528
 529 #ifndef LONGEST
 530 # ifdef LONG_LONG
 531 #  define LONGEST long long
 532 # else
 533 #  define LONGEST long
 534 # endif
 535 #endif
 536
 537 /* Assorted functions we can declare, now that const and volatile are
 538    defined.  */
 539
 540 extern char *
 541 savestring PARAMS ((const char *, int));
 542
 543 extern char *
 544 msavestring PARAMS ((void *, const char *, int));
 545
 546 extern char *
 547 strsave PARAMS ((const char *));
 548
 549 extern char *
 550 mstrsave PARAMS ((void *, const char *));
 551
 552 extern char *
 553 concat PARAMS ((char *, ...));
 554
 555 extern PTR
 556 xmalloc PARAMS ((long));
 557
 558 extern PTR
 559 xrealloc PARAMS ((PTR, long));
 560
 561 extern PTR
 562 xmmalloc PARAMS ((PTR, long));
 563
 564 extern PTR
 565 xmrealloc PARAMS ((PTR, PTR, long));
 566
 567 extern PTR
 568 mmalloc PARAMS ((PTR, long));
 569
 570 extern PTR
 571 mrealloc PARAMS ((PTR, PTR, long));
 572
 573 extern void
 574 mfree PARAMS ((PTR, PTR));
 575
 576 extern int
 577 mmcheck PARAMS ((PTR, void (*) (void)));
 578
 579 extern int
 580 mmtrace PARAMS ((void));
 581
 582 extern int
 583 parse_escape PARAMS ((char **));
 584
 585 extern const char * const reg_names[];
 586
 587 extern NORETURN void                    /* Does not return to the caller.  */
 588 error ();
 589
 590 extern NORETURN void                    /* Does not return to the caller.  */
 591 fatal ();
 592
 593 extern NORETURN void                    /* Not specified as volatile in ... */
 594 exit PARAMS ((int));                    /* 4.10.4.3 */
 595
 596 extern NORETURN void                    /* Does not return to the caller.  */
 597 nomem PARAMS ((long));
 598
 599 extern NORETURN void                    /* Does not return to the caller.  */
 600 return_to_top_level PARAMS ((void));
 601
 602 extern void
 603 warning_setup PARAMS ((void));
 604
 605 extern void
 606 warning ();
 607
 608 /* Global functions from other, non-gdb GNU thingies (libiberty for
 609    instance) */
 610
 611 extern char *
 612 basename PARAMS ((char *));
 613
 614 extern char *
 615 getenv PARAMS ((const char *));
 616
 617 extern char **
 618 buildargv PARAMS ((char *));
 619
 620 extern void
 621 freeargv PARAMS ((char **));
 622
 623 extern char *
 624 strerrno PARAMS ((int));
 625
 626 extern char *
 627 strsigno PARAMS ((int));
 628
 629 extern int
 630 errno_max PARAMS ((void));
 631
 632 extern int
 633 signo_max PARAMS ((void));
 634
 635 extern int
 636 strtoerrno PARAMS ((char *));
 637
 638 extern int
 639 strtosigno PARAMS ((char *));
 640
 641 extern char *
 642 strsignal PARAMS ((int));
 643
 644 /* From other system libraries */
 645
 646 #ifndef PSIGNAL_IN_SIGNAL_H
 647 extern void
 648 psignal PARAMS ((unsigned, char *));
 649 #endif
 650
 651 /* For now, we can't include <stdlib.h> because it conflicts with
 652    "../include/getopt.h".  (FIXME)
 653
 654    However, if a function is defined in the ANSI C standard and a prototype
 655    for that function is defined and visible in any header file in an ANSI
 656    conforming environment, then that prototype must match the definition in
 657    the ANSI standard.  So we can just duplicate them here without conflict,
 658    since they must be the same in all conforming ANSI environments.  If
 659    these cause problems, then the environment is not ANSI conformant. */
 660
 661 #ifdef __STDC__
 662 #include <stddef.h>
 663 #endif
 664
 665 extern int
 666 fclose PARAMS ((FILE *stream));                         /* 4.9.5.1 */
 667
 668 extern void
 669 perror PARAMS ((const char *));                         /* 4.9.10.4 */
 670
 671 extern double
 672 atof PARAMS ((const char *nptr));                       /* 4.10.1.1 */
 673
 674 extern int
 675 atoi PARAMS ((const char *));                           /* 4.10.1.2 */
 676
 677 #ifndef MALLOC_INCOMPATIBLE
 678
 679 extern PTR
 680 malloc PARAMS ((size_t size));                          /* 4.10.3.3 */
 681
 682 extern PTR
 683 realloc PARAMS ((void *ptr, size_t size));              /* 4.10.3.4 */
 684
 685 extern void
 686 free PARAMS ((void *));                                 /* 4.10.3.2 */
 687
 688 #endif  /* MALLOC_INCOMPATIBLE */
 689
 690 extern void
 691 qsort PARAMS ((void *base, size_t nmemb,                /* 4.10.5.2 */
 692                size_t size,
 693                int (*comp)(const void *, const void *)));
 694
 695 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 696 extern PTR
 697 memcpy PARAMS ((void *, const void *, size_t));         /* 4.11.2.1 */
 698 #endif
 699
 700 extern int
 701 memcmp PARAMS ((const void *, const void *, size_t));   /* 4.11.4.1 */
 702
 703 extern char *
 704 strchr PARAMS ((const char *, int));                    /* 4.11.5.2 */
 705
 706 extern char *
 707 strrchr PARAMS ((const char *, int));                   /* 4.11.5.5 */
 708
 709 extern char *
 710 strstr PARAMS ((const char *, const char *));           /* 4.11.5.7 */
 711
 712 extern char *
 713 strtok PARAMS ((char *, const char *));                 /* 4.11.5.8 */
 714
 715 #ifndef MEM_FNS_DECLARED        /* Some non-ANSI use void *, not char *.  */
 716 extern PTR
 717 memset PARAMS ((void *, int, size_t));                  /* 4.11.6.1 */
 718 #endif
 719
 720 extern char *
 721 strerror PARAMS ((int));                                /* 4.11.6.2 */
 722
 723 /* Various possibilities for alloca.  */
 724 #ifndef alloca
 725 # ifdef __GNUC__
 726 #  define alloca __builtin_alloca
 727 # else
 728 #  ifdef sparc
 729 #   include <alloca.h>          /* NOTE:  Doesn't declare alloca() */
 730 #  endif
 731 #  ifdef __STDC__
 732    extern void *alloca (size_t);
 733 #  else /* __STDC__ */
 734    extern char *alloca ();
 735 #  endif
 736 # endif
 737 #endif
 738
 739 /* TARGET_BYTE_ORDER and HOST_BYTE_ORDER must be defined to one of these.  */
 740
 741 #if !defined (BIG_ENDIAN)
 742 #define BIG_ENDIAN 4321
 743 #endif
 744
 745 #if !defined (LITTLE_ENDIAN)
 746 #define LITTLE_ENDIAN 1234
 747 #endif
 748
 749 /* Target-system-dependent parameters for GDB.
 750
 751    The standard thing is to include defs.h.  However, files that are
 752    specific to a particular target can define TM_FILE_OVERRIDE before
 753    including defs.h, then can include any particular tm-file they desire.  */
 754
 755 /* Target machine definition.  This will be a symlink to one of the
 756    tm-*.h files, built by the `configure' script.  */
 757
 758 #ifndef TM_FILE_OVERRIDE
 759 #include "tm.h"
 760 #endif
 761
 762 /* The bit byte-order has to do just with numbering of bits in
 763    debugging symbols and such.  Conceptually, it's quite separate
 764    from byte/word byte order.  */
 765
 766 #if !defined (BITS_BIG_ENDIAN)
 767 #if TARGET_BYTE_ORDER == BIG_ENDIAN
 768 #define BITS_BIG_ENDIAN 1
 769 #endif /* Big endian.  */
 770
 771 #if TARGET_BYTE_ORDER == LITTLE_ENDIAN
 772 #define BITS_BIG_ENDIAN 0
 773 #endif /* Little endian.  */
 774 #endif /* BITS_BIG_ENDIAN not defined.  */
 775
 776 /* Swap LEN bytes at BUFFER between target and host byte-order.  */
 777 #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
 778 #define SWAP_TARGET_AND_HOST(buffer,len)
 779 #else /* Target and host byte order differ.  */
 780 #define SWAP_TARGET_AND_HOST(buffer,len) \
 781   {                                                                      \
 782     char tmp;                                                            \
 783     char *p = (char *)(buffer);                                          \
 784     char *q = ((char *)(buffer)) + len - 1;                              \
 785     for (; p < q; p++, q--)                                              \
 786       {                                                                  \
 787         tmp = *q;                                                        \
 788         *q = *p;                                                         \
 789         *p = tmp;                                                        \
 790       }                                                                  \
 791   }
 792 #endif /* Target and host byte order differ.  */
 793
 794 /* On some machines there are bits in addresses which are not really
 795    part of the address, but are used by the kernel, the hardware, etc.
 796    for special purposes.  ADDR_BITS_REMOVE takes out any such bits
 797    so we get a "real" address such as one would find in a symbol
 798    table.  ADDR_BITS_SET sets those bits the way the system wants
 799    them.  */
 800 #if !defined (ADDR_BITS_REMOVE)
 801 #define ADDR_BITS_REMOVE(addr) (addr)
 802 #define ADDR_BITS_SET(addr) (addr)
 803 #endif /* No ADDR_BITS_REMOVE.  */
 804
 805 /* From valops.c */
 806
 807 extern CORE_ADDR
 808 push_bytes PARAMS ((CORE_ADDR, char *, int));
 809
 810 /* In some modules, we don't have a definition of REGISTER_TYPE yet, so we
 811    must avoid prototyping this function for now.  FIXME.  Should be:
 812 extern CORE_ADDR
 813 push_word PARAMS ((CORE_ADDR, REGISTER_TYPE));
 814  */
 815 extern CORE_ADDR
 816 push_word ();
 817
 818 /* Some parts of gdb might be considered optional, in the sense that they
 819    are not essential for being able to build a working, usable debugger
 820    for a specific environment.  For example, the maintenance commands
 821    are there for the benefit of gdb maintainers.  As another example,
 822    some environments really don't need gdb's that are able to read N
 823    different object file formats.  In order to make it possible (but
 824    not necessarily recommended) to build "stripped down" versions of
 825    gdb, the following defines control selective compilation of those
 826    parts of gdb which can be safely left out when necessary.  Note that
 827    the default is to include everything. */
 828
 829 #ifndef MAINTENANCE_CMDS
 830 #define MAINTENANCE_CMDS 1
 831 #endif
 832
 833 #endif /* !defined (DEFS_H) */