boehm-gc/gcconfig.h

   1 /*
   2  * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
   3  * Copyright (c) 1991-1994, 2001 by Xerox Corporation.  All rights reserved.
   4  * Copyright (c) 1996 by Silicon Graphics.  All rights reserved.
   5  *
   6  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
   7  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
   8  *
   9  * Permission is hereby granted to use or copy this program
  10  * for any purpose,  provided the above notices are retained on all copies.
  11  * Permission to modify the code and to distribute modified code is granted,
  12  * provided the above notices are retained, and a notice that the code was
  13  * modified is included with the above copyright notice.
  14  */
  15
  16 #ifndef GCCONFIG_H
  17
  18 # define GCCONFIG_H
  19
  20 /* Machine dependent parameters.  Some tuning parameters can be found   */
  21 /* near the top of gc_private.h.                                        */
  22
  23 /* Machine specific parts contributed by various people.  See README file. */
  24
  25 /* First a unified test for Linux: */
  26 # if defined(linux) || defined(__linux__)
  27 #    define LINUX
  28 # endif
  29
  30 /* Determine the machine type: */
  31 # if defined(sun) && defined(mc68000)
  32 #    define M68K
  33 #    define SUNOS4
  34 #    define mach_type_known
  35 # endif
  36 # if defined(hp9000s300)
  37 #    define M68K
  38 #    define HP
  39 #    define mach_type_known
  40 # endif
  41 # if defined(__OpenBSD__) && defined(m68k)
  42 #    define M68K
  43 #    define OPENBSD
  44 #    define mach_type_known
  45 # endif
  46 # if defined(__OpenBSD__) && defined(__sparc__)
  47 #    define SPARC
  48 #    define OPENBSD
  49 #    define mach_type_known
  50 # endif
  51 # if defined(__NetBSD__) && defined(m68k)
  52 #    define M68K
  53 #    define NETBSD
  54 #    define mach_type_known
  55 # endif
  56 # if defined(__NetBSD__) && defined(arm32)
  57 #    define ARM32
  58 #    define NETBSD
  59 #    define mach_type_known
  60 # endif
  61 # if defined(vax)
  62 #    define VAX
  63 #    ifdef ultrix
  64 #       define ULTRIX
  65 #    else
  66 #       define BSD
  67 #    endif
  68 #    define mach_type_known
  69 # endif
  70 # if defined(mips) || defined(__mips)
  71 #    define MIPS
  72 #    if !defined(LINUX)
  73 #      if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)
  74 #        define ULTRIX
  75 #      else
  76 #        if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \
  77             || defined(__SYSTYPE_SVR4__)
  78 #          define IRIX5   /* or IRIX 6.X */
  79 #        else
  80 #          define RISCOS  /* or IRIX 4.X */
  81 #        endif
  82 #      endif
  83 #    endif /* !LINUX */
  84 #    define mach_type_known
  85 # endif
  86 # if defined(sequent) && defined(i386)
  87 #    define I386
  88 #    define SEQUENT
  89 #    define mach_type_known
  90 # endif
  91 # if defined(sun) && defined(i386)
  92 #    define I386
  93 #    define SUNOS5
  94 #    define mach_type_known
  95 # endif
  96 # if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
  97 #    define I386
  98 #    define OS2
  99 #    define mach_type_known
 100 # endif
 101 # if defined(ibm032)
 102 #   define RT
 103 #   define mach_type_known
 104 # endif
 105 # if defined(sun) && (defined(sparc) || defined(__sparc))
 106 #   define SPARC
 107     /* Test for SunOS 5.x */
 108 #     include <errno.h>
 109 #     ifdef ECHRNG
 110 #       define SUNOS5
 111 #     else
 112 #       define SUNOS4
 113 #     endif
 114 #   define mach_type_known
 115 # endif
 116 # if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
 117      && !defined(__OpenBSD__)
 118 #   define SPARC
 119 #   define DRSNX
 120 #   define mach_type_known
 121 # endif
 122 # if defined(_IBMR2)
 123 #   define RS6000
 124 #   define mach_type_known
 125 # endif
 126 # if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
 127         /* The above test may need refinement   */
 128 #   define I386
 129 #   if defined(_SCO_ELF)
 130 #     define SCO_ELF
 131 #   else
 132 #     define SCO
 133 #   endif
 134 #   define mach_type_known
 135 # endif
 136 # if defined(_AUX_SOURCE)
 137 #   define M68K
 138 #   define SYSV
 139 #   define mach_type_known
 140 # endif
 141 # if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
 142      || defined(hppa) || defined(__hppa__)
 143 #   define HP_PA
 144 #   ifndef LINUX
 145 #     define HPUX
 146 #   endif
 147 #   define mach_type_known
 148 # endif
 149 # if defined(LINUX) && (defined(i386) || defined(__i386__))
 150 #    define I386
 151 #    define mach_type_known
 152 # endif
 153 # if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
 154 #    define IA64
 155 #    define mach_type_known
 156 # endif
 157 # if defined(LINUX) && defined(powerpc)
 158 #    define POWERPC
 159 #    define mach_type_known
 160 # endif
 161 # if defined(LINUX) && defined(__mc68000__)
 162 #    define M68K
 163 #    define mach_type_known
 164 # endif
 165 # if defined(LINUX) && (defined(sparc) || defined(__sparc__))
 166 #    define SPARC
 167 #    define mach_type_known
 168 # endif
 169 # if defined(LINUX) && defined(__arm__)
 170 #    define ARM32
 171 #    define mach_type_known
 172 # endif
 173 # if defined(__alpha) || defined(__alpha__)
 174 #   define ALPHA
 175 #   if !defined(LINUX)
 176 #     define OSF1       /* a.k.a Digital Unix */
 177 #   endif
 178 #   define mach_type_known
 179 # endif
 180 # if defined(_AMIGA) && !defined(AMIGA)
 181 #   define AMIGA
 182 # endif
 183 # ifdef AMIGA
 184 #   define M68K
 185 #   define mach_type_known
 186 # endif
 187 # if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
 188 #   define M68K
 189 #   define MACOS
 190 #   define mach_type_known
 191 # endif
 192 # if defined(__MWERKS__) && defined(__powerc)
 193 #   define POWERPC
 194 #   define MACOS
 195 #   define mach_type_known
 196 # endif
 197 # if defined(macosx)
 198 #    define MACOSX
 199 #    define POWERPC
 200 #    define mach_type_known
 201 # endif
 202 # if defined(NeXT) && defined(mc68000)
 203 #   define M68K
 204 #   define NEXT
 205 #   define mach_type_known
 206 # endif
 207 # if defined(NeXT) && defined(i386)
 208 #   define I386
 209 #   define NEXT
 210 #   define mach_type_known
 211 # endif
 212 # if defined(__OpenBSD__) && defined(i386)
 213 #   define I386
 214 #   define OPENBSD
 215 #   define mach_type_known
 216 # endif
 217 # if defined(__FreeBSD__) && defined(i386)
 218 #   define I386
 219 #   define FREEBSD
 220 #   define mach_type_known
 221 # endif
 222 # if defined(__NetBSD__) && defined(i386)
 223 #   define I386
 224 #   define NETBSD
 225 #   define mach_type_known
 226 # endif
 227 # if defined(bsdi) && defined(i386)
 228 #    define I386
 229 #    define BSDI
 230 #    define mach_type_known
 231 # endif
 232 # if !defined(mach_type_known) && defined(__386BSD__)
 233 #   define I386
 234 #   define THREE86BSD
 235 #   define mach_type_known
 236 # endif
 237 # if defined(_CX_UX) && defined(_M88K)
 238 #   define M88K
 239 #   define CX_UX
 240 #   define mach_type_known
 241 # endif
 242 # if defined(DGUX)
 243 #   define M88K
 244     /* DGUX defined */
 245 #   define mach_type_known
 246 # endif
 247 # if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
 248      || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
 249 #   define I386
 250 #   define MSWIN32      /* or Win32s */
 251 #   define mach_type_known
 252 # endif
 253 # if defined(__DJGPP__)
 254 #   define I386
 255 #   ifndef DJGPP
 256 #     define DJGPP  /* MSDOS running the DJGPP port of GCC */
 257 #   endif
 258 #   define mach_type_known
 259 # endif
 260 # if defined(__CYGWIN32__) || defined(__CYGWIN__)
 261 #   define I386
 262 #   define CYGWIN32
 263 #   define mach_type_known
 264 # endif
 265 # if defined(__MINGW32__)
 266 #   define I386
 267 #   define MSWIN32
 268 #   define mach_type_known
 269 # endif
 270 # if defined(__BORLANDC__)
 271 #   define I386
 272 #   define MSWIN32
 273 #   define mach_type_known
 274 # endif
 275 # if defined(_UTS) && !defined(mach_type_known)
 276 #   define S370
 277 #   define UTS4
 278 #   define mach_type_known
 279 # endif
 280 # if defined(__pj__)
 281 #   define PJ
 282 #   define mach_type_known
 283 # endif
 284 /* Ivan Demakov */
 285 # if defined(__WATCOMC__) && defined(__386__)
 286 #   define I386
 287 #   if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
 288 #     if defined(__OS2__)
 289 #       define OS2
 290 #     else
 291 #       if defined(__WINDOWS_386__) || defined(__NT__)
 292 #         define MSWIN32
 293 #       else
 294 #         define DOS4GW
 295 #       endif
 296 #     endif
 297 #   endif
 298 #   define mach_type_known
 299 # endif
 300 # if defined(__embedded__) && defined(PPC)
 301 #    define POWERPC
 302 #    define mach_type_known
 303 # endif
 304
 305 /* Feel free to add more clauses here */
 306
 307 /* Or manually define the machine type here.  A machine type is         */
 308 /* characterized by the architecture.  Some                             */
 309 /* machine types are further subdivided by OS.                          */
 310 /* the macros ULTRIX, RISCOS, and BSD to distinguish.                   */
 311 /* Note that SGI IRIX is treated identically to RISCOS.                 */
 312 /* SYSV on an M68K actually means A/UX.                                 */
 313 /* The distinction in these cases is usually the stack starting address */
 314 # ifndef mach_type_known
 315         --> unknown machine type
 316 # endif
 317                     /* Mapping is: M68K       ==> Motorola 680X0        */
 318                     /*             (SUNOS4,HP,NEXT, and SYSV (A/UX),    */
 319                     /*             MACOS and AMIGA variants)            */
 320                     /*             I386       ==> Intel 386             */
 321                     /*              (SEQUENT, OS2, SCO, LINUX, NETBSD,  */
 322                     /*               FREEBSD, THREE86BSD, MSWIN32,      */
 323                     /*               BSDI,SUNOS5, NEXT, other variants) */
 324                     /*             NS32K      ==> Encore Multimax       */
 325                     /*             MIPS       ==> R2000 or R3000        */
 326                     /*                  (RISCOS, ULTRIX variants)       */
 327                     /*             VAX        ==> DEC VAX               */
 328                     /*                  (BSD, ULTRIX variants)          */
 329                     /*             RS6000     ==> IBM RS/6000 AIX3.X    */
 330                     /*             RT         ==> IBM PC/RT             */
 331                     /*             HP_PA      ==> HP9000/700 & /800     */
 332                     /*                            HP/UX                 */
 333                     /*             SPARC      ==> SPARC v7/v8/v9        */
 334                     /*                  (SUNOS4, SUNOS5, LINUX,         */
 335                     /*                   DRSNX variants)                */
 336                     /*             ALPHA      ==> DEC Alpha             */
 337                     /*                  (OSF1 and LINUX variants)       */
 338                     /*             M88K       ==> Motorola 88XX0        */
 339                     /*                  (CX_UX and DGUX)                */
 340                     /*             S370       ==> 370-like machine      */
 341                     /*                  running Amdahl UTS4             */
 342                     /*             ARM32      ==> Intel StrongARM       */
 343                     /*             IA64       ==> Intel IA64            */
 344                     /*                            (e.g. Itanium)        */
 345
 346
 347 /*
 348  * For each architecture and OS, the following need to be defined:
 349  *
 350  * CPP_WORD_SZ is a simple integer constant representing the word size.
 351  * in bits.  We assume byte addressibility, where a byte has 8 bits.
 352  * We also assume CPP_WORD_SZ is either 32 or 64.
 353  * (We care about the length of pointers, not hardware
 354  * bus widths.  Thus a 64 bit processor with a C compiler that uses
 355  * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
 356  *
 357  * MACH_TYPE is a string representation of the machine type.
 358  * OS_TYPE is analogous for the OS.
 359  *
 360  * ALIGNMENT is the largest N, such that
 361  * all pointer are guaranteed to be aligned on N byte boundaries.
 362  * defining it to be 1 will always work, but perform poorly.
 363  *
 364  * DATASTART is the beginning of the data segment.
 365  * On UNIX systems, the collector will scan the area between DATASTART
 366  * and DATAEND for root pointers.
 367  *
 368  * DATAEND, if not &end.
 369  *
 370  * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
 371  * the pointer size.
 372  *
 373  * STACKBOTTOM is the cool end of the stack, which is usually the
 374  * highest address in the stack.
 375  * Under PCR or OS/2, we have other ways of finding thread stacks.
 376  * For each machine, the following should:
 377  * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
 378  * 2) define exactly one of
 379  *      STACKBOTTOM (should be defined to be an expression)
 380  *      HEURISTIC1
 381  *      HEURISTIC2
 382  * If either of the last two macros are defined, then STACKBOTTOM is computed
 383  * during collector startup using one of the following two heuristics:
 384  * HEURISTIC1:  Take an address inside GC_init's frame, and round it up to
 385  *              the next multiple of STACK_GRAN.
 386  * HEURISTIC2:  Take an address inside GC_init's frame, increment it repeatedly
 387  *              in small steps (decrement if STACK_GROWS_UP), and read the value
 388  *              at each location.  Remember the value when the first
 389  *              Segmentation violation or Bus error is signalled.  Round that
 390  *              to the nearest plausible page boundary, and use that instead
 391  *              of STACKBOTTOM.
 392  *
 393  * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
 394  * the value of environ is a pointer that can serve as STACKBOTTOM.
 395  * I expect that HEURISTIC2 can be replaced by this approach, which
 396  * interferes far less with debugging.
 397  *
 398  * If no expression for STACKBOTTOM can be found, and neither of the above
 399  * heuristics are usable, the collector can still be used with all of the above
 400  * undefined, provided one of the following is done:
 401  * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
 402  *    without reference to STACKBOTTOM.  This is appropriate for use in
 403  *    conjunction with thread packages, since there will be multiple stacks.
 404  *    (Allocating thread stacks in the heap, and treating them as ordinary
 405  *    heap data objects is also possible as a last resort.  However, this is
 406  *    likely to introduce significant amounts of excess storage retention
 407  *    unless the dead parts of the thread stacks are periodically cleared.)
 408  * 2) Client code may set GC_stackbottom before calling any GC_ routines.
 409  *    If the author of the client code controls the main program, this is
 410  *    easily accomplished by introducing a new main program, setting
 411  *    GC_stackbottom to the address of a local variable, and then calling
 412  *    the original main program.  The new main program would read something
 413  *    like:
 414  *
 415  *              # include "gc_private.h"
 416  *
 417  *              main(argc, argv, envp)
 418  *              int argc;
 419  *              char **argv, **envp;
 420  *              {
 421  *                  int dummy;
 422  *
 423  *                  GC_stackbottom = (ptr_t)(&dummy);
 424  *                  return(real_main(argc, argv, envp));
 425  *              }
 426  *
 427  *
 428  * Each architecture may also define the style of virtual dirty bit
 429  * implementation to be used:
 430  *   MPROTECT_VDB: Write protect the heap and catch faults.
 431  *   PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
 432  *
 433  * An architecture may define DYNAMIC_LOADING if dynamic_load.c
 434  * defined GC_register_dynamic_libraries() for the architecture.
 435  *
 436  * An architecture may define PREFETCH(x) to preload the cache with *x.
 437  * This defaults to a no-op.
 438  *
 439  * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
 440  *
 441  * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
 442  * clear the two words at GC_malloc-aligned address x.  By default,
 443  * word stores of 0 are used instead.
 444  */
 445
 446
 447 # define STACK_GRAN 0x1000000
 448 # ifdef M68K
 449 #   define MACH_TYPE "M68K"
 450 #   define ALIGNMENT 2
 451 #   ifdef OPENBSD
 452 #       define OS_TYPE "OPENBSD"
 453 #       define HEURISTIC2
 454         extern char etext;
 455 #       define DATASTART ((ptr_t)(&etext))
 456 #   endif
 457 #   ifdef NETBSD
 458 #       define OS_TYPE "NETBSD"
 459 #       define HEURISTIC2
 460         extern char etext;
 461 #       define DATASTART ((ptr_t)(&etext))
 462 #   endif
 463 #   ifdef LINUX
 464 #       define OS_TYPE "LINUX"
 465 #       define STACKBOTTOM ((ptr_t)0xf0000000)
 466 #       define MPROTECT_VDB
 467 #       ifdef __ELF__
 468 #            define DYNAMIC_LOADING
 469              extern char **__environ;
 470 #            define DATASTART ((ptr_t)(&__environ))
 471                              /* hideous kludge: __environ is the first */
 472                              /* word in crt0.o, and delimits the start */
 473                              /* of the data segment, no matter which   */
 474                              /* ld options were passed through.        */
 475                              /* We could use _etext instead, but that  */
 476                              /* would include .rodata, which may       */
 477                              /* contain large read-only data tables    */
 478                              /* that we'd rather not scan.             */
 479              extern int _end;
 480 #            define DATAEND (&_end)
 481 #       else
 482              extern int etext;
 483 #            define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 484 #       endif
 485 #   endif
 486 #   ifdef SUNOS4
 487 #       define OS_TYPE "SUNOS4"
 488         extern char etext;
 489 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
 490 #       define HEURISTIC1       /* differs      */
 491 #       define DYNAMIC_LOADING
 492 #   endif
 493 #   ifdef HP
 494 #       define OS_TYPE "HP"
 495         extern char etext;
 496 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 497 #       define STACKBOTTOM ((ptr_t) 0xffeffffc)
 498                               /* empirically determined.  seems to work. */
 499 #       include <unistd.h>
 500 #       define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
 501 #   endif
 502 #   ifdef SYSV
 503 #       define OS_TYPE "SYSV"
 504         extern etext;
 505 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
 506                                    & ~0x3fffff) \
 507                                   +((word)&etext & 0x1fff))
 508         /* This only works for shared-text binaries with magic number 0413.
 509            The other sorts of SysV binaries put the data at the end of the text,
 510            in which case the default of &etext would work.  Unfortunately,
 511            handling both would require having the magic-number available.
 512                                 -- Parag
 513            */
 514 #       define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
 515                         /* The stack starts at the top of memory, but   */
 516                         /* 0x0 cannot be used as setjump_test complains */
 517                         /* that the stack direction is incorrect.  Two  */
 518                         /* bytes down from 0x0 should be safe enough.   */
 519                         /*              --Parag                         */
 520 #       include <sys/mmu.h>
 521 #       define GETPAGESIZE() PAGESIZE   /* Is this still right? */
 522 #   endif
 523 #   ifdef AMIGA
 524 #       define OS_TYPE "AMIGA"
 525                 /* STACKBOTTOM and DATASTART handled specially  */
 526                 /* in os_dep.c                                  */
 527 #       define DATAEND  /* not needed */
 528 #       define GETPAGESIZE() 4096
 529 #   endif
 530 #   ifdef MACOS
 531 #     ifndef __LOWMEM__
 532 #     include <LowMem.h>
 533 #     endif
 534 #     define OS_TYPE "MACOS"
 535                         /* see os_dep.c for details of global data segments. */
 536 #     define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
 537 #     define DATAEND    /* not needed */
 538 #     define GETPAGESIZE() 4096
 539 #   endif
 540 #   ifdef NEXT
 541 #       define OS_TYPE "NEXT"
 542 #       define DATASTART ((ptr_t) get_etext())
 543 #       define STACKBOTTOM ((ptr_t) 0x4000000)
 544 #       define DATAEND  /* not needed */
 545 #   endif
 546 # endif
 547
 548 # ifdef POWERPC
 549 #   define MACH_TYPE "POWERPC"
 550 #   ifdef MACOS
 551 #     define ALIGNMENT 2  /* Still necessary?  Could it be 4?   */
 552 #     ifndef __LOWMEM__
 553 #     include <LowMem.h>
 554 #     endif
 555 #     define OS_TYPE "MACOS"
 556                         /* see os_dep.c for details of global data segments. */
 557 #     define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
 558 #     define DATAEND  /* not needed */
 559 #   endif
 560 #   ifdef LINUX
 561 #     define ALIGNMENT 4        /* Guess.  Can someone verify?  */
 562                                 /* This was 2, but that didn't sound right. */
 563 #     define OS_TYPE "LINUX"
 564 #     define HEURISTIC1
 565 #     define DYNAMIC_LOADING
 566 #     undef STACK_GRAN
 567 #     define STACK_GRAN 0x10000000
 568         /* Stack usually starts at 0x80000000 */
 569 #     define LINUX_DATA_START
 570       extern int _end;
 571 #     define DATAEND (&_end)
 572 #   endif
 573 #   ifdef MACOSX
 574 #     define ALIGNMENT 4
 575 #     define OS_TYPE "MACOSX"
 576 #     define DATASTART ((ptr_t) get_etext())
 577 #     define STACKBOTTOM ((ptr_t) 0xc0000000)
 578 #     define DATAEND    /* not needed */
 579 #   endif
 580 #   ifdef __embedded__
 581 #     define ALIGNMENT 4
 582 #     define OS_TYPE "EMBEDDED"
 583       extern void __end, __dso_handle;
 584 #     define DATASTART (&__dso_handle)  /* OK, that's ugly.  */
 585 #     define DATAEND (&__end)
 586         /* Stack starts at 0xE0000000 for the simulator.  */
 587 #     undef STACK_GRAN
 588 #     define STACK_GRAN 0x10000000
 589 #     define HEURISTIC1
 590 #   endif
 591 # endif
 592
 593 # ifdef VAX
 594 #   define MACH_TYPE "VAX"
 595 #   define ALIGNMENT 4  /* Pointers are longword aligned by 4.2 C compiler */
 596     extern char etext;
 597 #   define DATASTART ((ptr_t)(&etext))
 598 #   ifdef BSD
 599 #       define OS_TYPE "BSD"
 600 #       define HEURISTIC1
 601                         /* HEURISTIC2 may be OK, but it's hard to test. */
 602 #   endif
 603 #   ifdef ULTRIX
 604 #       define OS_TYPE "ULTRIX"
 605 #       define STACKBOTTOM ((ptr_t) 0x7fffc800)
 606 #   endif
 607 # endif
 608
 609 # ifdef RT
 610 #   define MACH_TYPE "RT"
 611 #   define ALIGNMENT 4
 612 #   define DATASTART ((ptr_t) 0x10000000)
 613 #   define STACKBOTTOM ((ptr_t) 0x1fffd800)
 614 # endif
 615
 616 # ifdef SPARC
 617 #   define MACH_TYPE "SPARC"
 618 #   if defined(__arch64__) || defined(__sparcv9)
 619 #     define ALIGNMENT 8
 620 #   else
 621 #     define ALIGNMENT 4        /* Required by hardware */
 622 #   endif
 623 #   define ALIGN_DOUBLE
 624     extern int etext;
 625 #   ifdef SUNOS5
 626 #       define OS_TYPE "SUNOS5"
 627         extern int _etext;
 628         extern int _end;
 629         extern char * GC_SysVGetDataStart();
 630 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
 631 #       define DATAEND (&_end)
 632 #       ifndef USE_MMAP
 633 #           define USE_MMAP
 634 #       endif
 635 #       ifdef USE_MMAP
 636 #         define HEAP_START (ptr_t)0x40000000
 637 #       else
 638 #         define HEAP_START DATAEND
 639 #       endif
 640 #       define PROC_VDB
 641 /*      HEURISTIC1 reportedly no longer works under 2.7.  Thus we       */
 642 /*      switched to HEURISTIC2, eventhough it creates some debugging    */
 643 /*      issues.                                                         */
 644 #       define HEURISTIC2
 645 #       include <unistd.h>
 646 #       define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
 647                 /* getpagesize() appeared to be missing from at least one */
 648                 /* Solaris 5.4 installation.  Weird.                      */
 649 #       define DYNAMIC_LOADING
 650 #   endif
 651 #   ifdef SUNOS4
 652 #       define OS_TYPE "SUNOS4"
 653         /* [If you have a weak stomach, don't read this.]               */
 654         /* We would like to use:                                        */
 655 /* #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
 656         /* This fails occasionally, due to an ancient, but very         */
 657         /* persistent ld bug.  &etext is set 32 bytes too high.         */
 658         /* We instead read the text segment size from the a.out         */
 659         /* header, which happens to be mapped into our address space    */
 660         /* at the start of the text segment.  The detective work here   */
 661         /* was done by Robert Ehrlich, Manuel Serrano, and Bernard      */
 662         /* Serpette of INRIA.                                           */
 663         /* This assumes ZMAGIC, i.e. demand-loadable executables.       */
 664 #       define TEXTSTART 0x2000
 665 #       define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
 666 #       define MPROTECT_VDB
 667 #       define HEURISTIC1
 668 #       define DYNAMIC_LOADING
 669 #   endif
 670 #   ifdef DRSNX
 671 #       define CPP_WORDSZ 32
 672 #       define OS_TYPE "DRSNX"
 673         extern char * GC_SysVGetDataStart();
 674         extern int etext;
 675 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
 676 #       define MPROTECT_VDB
 677 #       define STACKBOTTOM ((ptr_t) 0xdfff0000)
 678 #       define DYNAMIC_LOADING
 679 #   endif
 680 #   ifdef LINUX
 681 #     define OS_TYPE "LINUX"
 682 #     ifdef __ELF__
 683 #       define DYNAMIC_LOADING
 684 #     else
 685           Linux Sparc/a.out not supported
 686 #     endif
 687       extern int _etext;
 688       extern int _end;
 689 #     define DATAEND (&_end)
 690 #     define SVR4
 691 #     ifdef __arch64__
 692 #       define STACKBOTTOM ((ptr_t) 0x80000000000ULL)
 693 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x100000, &_etext)
 694 #       define CPP_WORDSZ 64
 695 #     else
 696 #       define STACKBOTTOM ((ptr_t) 0xf0000000)
 697 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
 698 #     endif
 699 #   endif
 700 #   ifdef OPENBSD
 701 #     define OS_TYPE "OPENBSD"
 702 #     define STACKBOTTOM ((ptr_t) 0xf8000000)
 703 #     define DATASTART ((ptr_t)(&etext))
 704 #   endif
 705 # endif
 706
 707 # ifdef I386
 708 #   define MACH_TYPE "I386"
 709 #   define ALIGNMENT 4  /* Appears to hold for all "32 bit" compilers   */
 710                         /* except Borland.  The -a4 option fixes        */
 711                         /* Borland.                                     */
 712                         /* Ivan Demakov: For Watcom the option is -zp4. */
 713 #   ifndef SMALL_CONFIG
 714 #     define ALIGN_DOUBLE /* Not strictly necessary, but may give speed   */
 715                           /* improvement on Pentiums.                     */
 716 #   endif
 717 #   ifdef SEQUENT
 718 #       define OS_TYPE "SEQUENT"
 719         extern int etext;
 720 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 721 #       define STACKBOTTOM ((ptr_t) 0x3ffff000)
 722 #   endif
 723 #   ifdef SUNOS5
 724 #       define OS_TYPE "SUNOS5"
 725         extern int _etext, _end;
 726         extern char * GC_SysVGetDataStart();
 727 #       define DATASTART GC_SysVGetDataStart(0x1000, &_etext)
 728 #       define DATAEND (&_end)
 729 #       include <sys/vm.h>
 730 #       define STACKBOTTOM USRSTACK
 731 /** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
 732 #       ifdef SOLARIS25_PROC_VDB_BUG_FIXED
 733 #         define PROC_VDB
 734 #       endif
 735 #       define DYNAMIC_LOADING
 736 #       ifndef USE_MMAP
 737 #           define USE_MMAP
 738 #       endif
 739 #       ifdef USE_MMAP
 740 #         define HEAP_START (ptr_t)0x40000000
 741 #       else
 742 #         define HEAP_START DATAEND
 743 #       endif
 744 #   endif
 745 #   ifdef SCO
 746 #       define OS_TYPE "SCO"
 747         extern int etext;
 748 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
 749                                   & ~0x3fffff) \
 750                                  +((word)&etext & 0xfff))
 751 #       define STACKBOTTOM ((ptr_t) 0x7ffffffc)
 752 #   endif
 753 #   ifdef SCO_ELF
 754 #       define OS_TYPE "SCO_ELF"
 755         extern int etext;
 756 #       define DATASTART ((ptr_t)(&etext))
 757 #       define STACKBOTTOM ((ptr_t) 0x08048000)
 758 #       define DYNAMIC_LOADING
 759 #       define ELF_CLASS ELFCLASS32
 760 #   endif
 761 #   ifdef LINUX
 762 #       define OS_TYPE "LINUX"
 763 #       define LINUX_STACKBOTTOM
 764 #       if 0
 765 #         define HEURISTIC1
 766 #         undef STACK_GRAN
 767 #         define STACK_GRAN 0x10000000
 768           /* STACKBOTTOM is usually 0xc0000000, but this changes with   */
 769           /* different kernel configurations.  In particular, systems   */
 770           /* with 2GB physical memory will usually move the user        */
 771           /* address space limit, and hence initial SP to 0x80000000.   */
 772 #       endif
 773 #       if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
 774         /* libgcj: Linux threads don't interact well with the read() wrapper.
 775            Not defining MPROTECT_VDB fixes this.  */
 776 /* #        define MPROTECT_VDB */
 777 #       else
 778             /* We seem to get random errors in incremental mode,        */
 779             /* possibly because Linux threads is itself a malloc client */
 780             /* and can't deal with the signals.                         */
 781 #       endif
 782 #       ifdef __ELF__
 783 #            define DYNAMIC_LOADING
 784 #            ifdef UNDEFINED    /* includes ro data */
 785                extern int _etext;
 786 #              define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
 787 #            endif
 788 #            include <features.h>
 789 #            if defined(__GLIBC__) && __GLIBC__ >= 2
 790 #                define LINUX_DATA_START
 791 #            else
 792                  extern char **__environ;
 793 #                define DATASTART ((ptr_t)(&__environ))
 794                               /* hideous kludge: __environ is the first */
 795                               /* word in crt0.o, and delimits the start */
 796                               /* of the data segment, no matter which   */
 797                               /* ld options were passed through.        */
 798                               /* We could use _etext instead, but that  */
 799                               /* would include .rodata, which may       */
 800                               /* contain large read-only data tables    */
 801                               /* that we'd rather not scan.             */
 802 #            endif
 803              extern int _end;
 804 #            define DATAEND (&_end)
 805 #       else
 806              extern int etext;
 807 #            define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 808 #       endif
 809 #       ifdef USE_I686_PREFETCH
 810 #         define PREFETCH(x) \
 811             __asm__ __volatile__ ("     prefetchnta     %0": : "m"(*(char *)(x)))
 812             /* Empirically prefetcht0 is much more effective at reducing        */
 813             /* cache miss stalls for the targetted load instructions.  But it   */
 814             /* seems to interfere enough with other cache traffic that the net  */
 815             /* result is worse than prefetchnta.                                */
 816 #         if 0
 817             /* Using prefetches for write seems to have a slight negative       */
 818             /* impact on performance, at least for a PIII/500.                  */
 819 #           define PREFETCH_FOR_WRITE(x) \
 820               __asm__ __volatile__ ("   prefetcht0      %0": : "m"(*(char *)(x)))
 821 #         endif
 822 #       endif
 823 #       ifdef USE_3DNOW_PREFETCH
 824 #         define PREFETCH(x) \
 825             __asm__ __volatile__ ("     prefetch        %0": : "m"(*(char *)(x)))
 826 #         define PREFETCH_FOR_WRITE(x)
 827             __asm__ __volatile__ ("     prefetchw       %0": : "m"(*(char *)(x)))
 828 #       endif
 829 #   endif
 830 #   ifdef CYGWIN32
 831 #       define OS_TYPE "CYGWIN32"
 832           extern int _data_start__;
 833           extern int _data_end__;
 834           extern int _bss_start__;
 835           extern int _bss_end__;
 836         /* For binutils 2.9.1, we have                  */
 837         /*      DATASTART   = _data_start__             */
 838         /*      DATAEND     = _bss_end__                */
 839         /* whereas for some earlier versions it was     */
 840         /*      DATASTART   = _bss_start__              */
 841         /*      DATAEND     = _data_end__               */
 842         /* To get it right for both, we take the        */
 843         /* minumum/maximum of the two.                  */
 844 #       define MAX(x,y) ((x) > (y) ? (x) : (y))
 845 #       define MIN(x,y) ((x) < (y) ? (x) : (y))
 846 #       define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
 847 #       define DATAEND   ((ptr_t) MAX(&_data_end__, &_bss_end__))
 848 #       undef STACK_GRAN
 849 #       define STACK_GRAN 0x10000
 850 #       define HEURISTIC1
 851 #   endif
 852 #   ifdef OS2
 853 #       define OS_TYPE "OS2"
 854                 /* STACKBOTTOM and DATASTART are handled specially in   */
 855                 /* os_dep.c. OS2 actually has the right                 */
 856                 /* system call!                                         */
 857 #       define DATAEND  /* not needed */
 858 #   endif
 859 #   ifdef MSWIN32
 860 #       define OS_TYPE "MSWIN32"
 861                 /* STACKBOTTOM and DATASTART are handled specially in   */
 862                 /* os_dep.c.                                            */
 863 #       ifndef __WATCOMC__
 864 #         define MPROTECT_VDB
 865 #       endif
 866 #       define DATAEND  /* not needed */
 867 #   endif
 868 #   ifdef DJGPP
 869 #       define OS_TYPE "DJGPP"
 870 #       include "stubinfo.h"
 871         extern int etext;
 872         extern int _stklen;
 873         extern int __djgpp_stack_limit;
 874 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
 875 /* #       define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
 876                                                      + _stklen)) */
 877 #       define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
 878                 /* This may not be right.  */
 879 #   endif
 880 #   ifdef OPENBSD
 881 #       define OS_TYPE "OPENBSD"
 882 #   endif
 883 #   ifdef FREEBSD
 884 #       define OS_TYPE "FREEBSD"
 885 #       define MPROTECT_VDB
 886 #   endif
 887 #   ifdef NETBSD
 888 #       define OS_TYPE "NETBSD"
 889 #   endif
 890 #   ifdef THREE86BSD
 891 #       define OS_TYPE "THREE86BSD"
 892 #   endif
 893 #   ifdef BSDI
 894 #       define OS_TYPE "BSDI"
 895 #   endif
 896 #   if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
 897         || defined(THREE86BSD) || defined(BSDI)
 898 #       define HEURISTIC2
 899         extern char etext;
 900 #       define DATASTART ((ptr_t)(&etext))
 901 #   endif
 902 #   ifdef NEXT
 903 #       define OS_TYPE "NEXT"
 904 #       define DATASTART ((ptr_t) get_etext())
 905 #       define STACKBOTTOM ((ptr_t)0xc0000000)
 906 #       define DATAEND  /* not needed */
 907 #   endif
 908 #   ifdef DOS4GW
 909 #     define OS_TYPE "DOS4GW"
 910       extern long __nullarea;
 911       extern char _end;
 912       extern char *_STACKTOP;
 913       /* Depending on calling conventions Watcom C either precedes
 914          or does not precedes with undescore names of C-variables.
 915          Make sure startup code variables always have the same names.  */
 916       #pragma aux __nullarea "*";
 917       #pragma aux _end "*";
 918 #     define STACKBOTTOM ((ptr_t) _STACKTOP)
 919                          /* confused? me too. */
 920 #     define DATASTART ((ptr_t) &__nullarea)
 921 #     define DATAEND ((ptr_t) &_end)
 922 #   endif
 923 # endif
 924
 925 # ifdef NS32K
 926 #   define MACH_TYPE "NS32K"
 927 #   define ALIGNMENT 4
 928     extern char **environ;
 929 #   define DATASTART ((ptr_t)(&environ))
 930                               /* hideous kludge: environ is the first   */
 931                               /* word in crt0.o, and delimits the start */
 932                               /* of the data segment, no matter which   */
 933                               /* ld options were passed through.        */
 934 #   define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
 935 # endif
 936
 937 # ifdef MIPS
 938 # ifndef ECOS
 939 #   define MACH_TYPE "MIPS"
 940         /* LIBGCJ LOCAL: respect predefined DATASTART_IS_ETEXT.  */
 941 #   ifdef DATASTART_IS_ETEXT
 942         extern int _etext;
 943 #     define DATASTART ((ptr_t)(&_etext))
 944 #   else
 945 /* #   define STACKBOTTOM ((ptr_t)0x7fff8000)  sometimes also works.  */
 946 #   ifdef LINUX
 947       /* This was developed for a linuxce style platform.  Probably     */
 948       /* needs to be tweaked for workstation class machines.            */
 949 #     define OS_TYPE "LINUX"
 950       extern int __data_start;
 951 #     define DATASTART ((ptr_t)(&__data_start))
 952 #     define ALIGNMENT 4
 953 #     define USE_GENERIC_PUSH_REGS 1
 954 #     define STACKBOTTOM 0x80000000
 955         /* In many cases, this should probably use LINUX_STACKBOTTOM    */
 956         /* instead. But some kernel versions seem to give the wrong     */
 957         /* value from /proc.                                            */
 958 #   endif /* Linux */
 959 #   ifdef ULTRIX
 960 #       define HEURISTIC2
 961 #       define DATASTART (ptr_t)0x10000000
 962                               /* Could probably be slightly higher since */
 963                               /* startup code allocates lots of stuff.   */
 964 #       define OS_TYPE "ULTRIX"
 965 #       define ALIGNMENT 4
 966 #   endif
 967 #   ifdef RISCOS
 968 #       define HEURISTIC2
 969 #       define DATASTART (ptr_t)0x10000000
 970 #       define OS_TYPE "RISCOS"
 971 #       define ALIGNMENT 4  /* Required by hardware */
 972 #   endif
 973 #   ifdef IRIX5
 974 #       define HEURISTIC2
 975         extern int _fdata;
 976 #       define DATASTART ((ptr_t)(&_fdata))
 977 #       ifdef USE_MMAP
 978 #         define HEAP_START (ptr_t)0x30000000
 979 #       else
 980 #         define HEAP_START DATASTART
 981 #       endif
 982                               /* Lowest plausible heap address.         */
 983                               /* In the MMAP case, we map there.        */
 984                               /* In either case it is used to identify  */
 985                               /* heap sections so they're not           */
 986                               /* considered as roots.                   */
 987 #       define OS_TYPE "IRIX5"
 988 #       define MPROTECT_VDB
 989 #       ifdef _MIPS_SZPTR
 990 #         define CPP_WORDSZ _MIPS_SZPTR
 991 #         define ALIGNMENT (_MIPS_SZPTR/8)
 992 #         if CPP_WORDSZ != 64
 993 #           define ALIGN_DOUBLE
 994 #         endif
 995 #       else
 996 #         define ALIGNMENT 4
 997 #         define ALIGN_DOUBLE
 998 #       endif
 999 #       define DYNAMIC_LOADING
1000 #   endif
1001 #   endif /* DATASTART_IS_ETEXT */
1002 #   endif /* ECOS */
1003 # ifdef ECOS
1004     extern char __ram_data_start;
1005     extern char __ram_data_end;
1006 #   define MACH_TYPE "MIPS"
1007 #   define DATASTART (ptr_t)(&__ram_data_start)
1008 #   define DATAEND (ptr_t)(&__ram_data_end)
1009
1010 #   define HEURISTIC2
1011 #   define ALIGNMENT 4
1012 #   define ALIGN_DOUBLE
1013 #   endif /* ECOS */
1014 # endif
1015
1016 # ifdef RS6000
1017 #   define MACH_TYPE "RS6000"
1018 #   define ALIGNMENT 4
1019 #   define DATASTART ((ptr_t)0x20000000)
1020     extern int errno;
1021 #   define STACKBOTTOM ((ptr_t)((ulong)&errno))
1022 #   define DYNAMIC_LOADING
1023         /* For really old versions of AIX, this may have to be removed. */
1024 # endif
1025
1026 # ifdef HP_PA
1027     /* OS is assumed to be HP/UX        */
1028 #   define MACH_TYPE "HP_PA"
1029 #   define OS_TYPE "HPUX"
1030 #   ifdef __LP64__
1031 #     define CPP_WORDSZ 64
1032 #     define ALIGNMENT 8
1033 #   else
1034 #     define CPP_WORDSZ 32
1035 #     define ALIGNMENT 4
1036 #     define ALIGN_DOUBLE
1037 #   endif
1038     extern int __data_start;
1039 #   define DATASTART ((ptr_t)(&__data_start))
1040 #   if 0
1041         /* The following appears to work for 7xx systems running HP/UX  */
1042         /* 9.xx Furthermore, it might result in much faster             */
1043         /* collections than HEURISTIC2, which may involve scanning      */
1044         /* segments that directly precede the stack.  It is not the     */
1045         /* default, since it may not work on older machine/OS           */
1046         /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1047         /* this.)                                                       */
1048 #       define STACKBOTTOM ((ptr_t) 0x7b033000)  /* from /etc/conf/h/param.h */
1049 #   else
1050         /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2       */
1051         /* to this.  We'll probably do this on other platforms, too.    */
1052         /* For now I'll use it where I can test it.                     */
1053         extern char ** environ;
1054 #       define STACKBOTTOM ((ptr_t)environ)
1055 #   endif
1056 #   define STACK_GROWS_UP
1057 #   define DYNAMIC_LOADING
1058 #   ifndef HPUX_THREADS
1059 #     define MPROTECT_VDB
1060 #   endif
1061 #   include <unistd.h>
1062 #   define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1063 # endif
1064
1065 # ifdef ALPHA
1066 #   define MACH_TYPE "ALPHA"
1067 #   define ALIGNMENT 8
1068 #   define USE_GENERIC_PUSH_REGS
1069         /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1070         /* fp registers in some cases when the target is a 21264.  The assembly */
1071         /* code doesn't handle that yet, and version dependencies make that a   */
1072         /* bit tricky.  Do the easy thing for now.                              */
1073 #   ifdef OSF1
1074 #       define OS_TYPE "OSF1"
1075 #       define DATASTART ((ptr_t) 0x140000000)
1076         extern int _end;
1077 #       define DATAEND ((ptr_t) &_end)
1078 #       define HEURISTIC2
1079         /* Normally HEURISTIC2 is too conervative, since                */
1080         /* the text segment immediately follows the stack.              */
1081         /* Hence we give an upper pound.                                */
1082         extern int __start;
1083 #       define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
1084 #       define CPP_WORDSZ 64
1085 #       define MPROTECT_VDB
1086 #       define DYNAMIC_LOADING
1087 #   endif
1088 #   ifdef LINUX
1089 #       define OS_TYPE "LINUX"
1090 #       define CPP_WORDSZ 64
1091 #       define STACKBOTTOM ((ptr_t) 0x120000000)
1092 #       ifdef __ELF__
1093 #         define LINUX_DATA_START
1094 #         define DYNAMIC_LOADING
1095           /* This doesn't work if the collector is in a dynamic library. */
1096 #       else
1097 #           define DATASTART ((ptr_t) 0x140000000)
1098 #       endif
1099         extern int _end;
1100 #       define DATAEND (&_end)
1101 #       undef MPROTECT_VDB
1102                 /* Has only been superficially tested.  May not */
1103                 /* work on all versions.                        */
1104 #   endif
1105 # endif
1106
1107 # ifdef IA64
1108 #   define MACH_TYPE "IA64"
1109 #   define ALIGN_DOUBLE
1110         /* Requires 16 byte alignment for malloc */
1111 #   define ALIGNMENT 8
1112 #   define USE_GENERIC_PUSH_REGS
1113         /* We need to get preserved registers in addition to register windows.  */
1114         /* That's easiest to do with setjmp.                                    */
1115 #   ifdef HPUX
1116         --> needs work
1117 #   endif
1118 #   ifdef LINUX
1119 #       define OS_TYPE "LINUX"
1120 #       define CPP_WORDSZ 64
1121         /* This should really be done through /proc, but that   */
1122         /* requires we run on an IA64 kernel.                   */
1123         /* The following works on NUE and older kernels:        */
1124 /* #       define STACKBOTTOM ((ptr_t) 0xa000000000000000l)     */
1125         /* This does not work on NUE:                           */
1126 #       define LINUX_STACKBOTTOM
1127         /* We also need the base address of the register stack  */
1128         /* backing store.  There should be a better way to get  */
1129         /* this:                                                */
1130 #       define APPROX_BS_BASE ((word)GC_stackbottom-0x80000000)
1131         /* We round to the next multiple of 1 MB, to compensate */
1132         /* for the fact that the stack base is displaced by     */
1133         /* the environment, etc.                                */
1134 #       define BACKING_STORE_BASE \
1135                 (ptr_t)((APPROX_BS_BASE + 0xfffff) & ~0xfffff)
1136
1137 #       if 1
1138 #           define SEARCH_FOR_DATA_START
1139 #           define DATASTART GC_data_start
1140 #       else
1141             extern int data_start;
1142 #           define DATASTART ((ptr_t)(&data_start))
1143 #       endif
1144 #       define DYNAMIC_LOADING
1145 #       define MPROTECT_VDB
1146                 /* Requires Linux 2.3.47 or later.      */
1147         extern int _end;
1148 #       define DATAEND (&_end)
1149 #       define PREFETCH(x) \
1150           __asm__ ("    lfetch  [%0]": : "r"((void *)(x)))
1151 #       define PREFETCH_FOR_WRITE(x) \
1152           __asm__ ("    lfetch.excl     [%0]": : "r"((void *)(x)))
1153 #       define CLEAR_DOUBLE(x) \
1154           __asm__ ("    stf.spill       [%0]=f0": : "r"((void *)(x)))
1155 #   endif
1156 # endif
1157
1158 # ifdef M88K
1159 #   define MACH_TYPE "M88K"
1160 #   define ALIGNMENT 4
1161 #   define ALIGN_DOUBLE
1162     extern int etext;
1163 #   ifdef CX_UX
1164 #       define OS_TYPE "CX_UX"
1165 #       define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1166 #   endif
1167 #   ifdef  DGUX
1168 #       define OS_TYPE "DGUX"
1169         extern char * GC_SysVGetDataStart();
1170 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
1171 #   endif
1172 #   define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1173 # endif
1174
1175 # ifdef S370
1176 #   define MACH_TYPE "S370"
1177 #   define OS_TYPE "UTS4"
1178 #   define ALIGNMENT 4  /* Required by hardware */
1179     extern int etext;
1180         extern int _etext;
1181         extern int _end;
1182         extern char * GC_SysVGetDataStart();
1183 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
1184 #       define DATAEND (&_end)
1185 #       define HEURISTIC2
1186 # endif
1187
1188 # if defined(PJ)
1189 #   define ALIGNMENT 4
1190     extern int _etext;
1191 #   define DATASTART ((ptr_t)(&_etext))
1192 #   define HEURISTIC1
1193 # endif
1194
1195 # ifdef ARM32
1196 #   define CPP_WORDSZ 32
1197 #   define MACH_TYPE "ARM32"
1198 #   define ALIGNMENT 4
1199 #   ifdef NETBSD
1200 #       define OS_TYPE "NETBSD"
1201 #       define HEURISTIC2
1202         extern char etext;
1203 #       define DATASTART ((ptr_t)(&etext))
1204 #       define USE_GENERIC_PUSH_REGS
1205 #   endif
1206 #   ifdef LINUX
1207 #       define OS_TYPE "LINUX"
1208 #       define HEURISTIC1
1209 #       undef STACK_GRAN
1210 #       define STACK_GRAN 0x10000000
1211 #       define USE_GENERIC_PUSH_REGS
1212 #       ifdef __ELF__
1213 #            define DYNAMIC_LOADING
1214 #            include <features.h>
1215 #            if defined(__GLIBC__) && __GLIBC__ >= 2
1216 #                define LINUX_DATA_START
1217 #            else
1218                  extern char **__environ;
1219 #                define DATASTART ((ptr_t)(&__environ))
1220                               /* hideous kludge: __environ is the first */
1221                               /* word in crt0.o, and delimits the start */
1222                               /* of the data segment, no matter which   */
1223                               /* ld options were passed through.        */
1224                               /* We could use _etext instead, but that  */
1225                               /* would include .rodata, which may       */
1226                               /* contain large read-only data tables    */
1227                               /* that we'd rather not scan.             */
1228 #            endif
1229              extern int _end;
1230 #            define DATAEND (&_end)
1231 #       else
1232              extern int etext;
1233 #            define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
1234 #       endif
1235 #   endif
1236 #endif
1237
1238 #ifdef LINUX_DATA_START
1239     /* Some Linux distributions arrange to define __data_start.  Some   */
1240     /* define data_start as a weak symbol.  The latter is technically   */
1241     /* broken, since the user program may define data_start, in which   */
1242     /* case we lose.  Nonetheless, we try both, prefering __data_start. */
1243     /* We assume gcc.   */
1244 #   pragma weak __data_start
1245     extern int __data_start;
1246 #   pragma weak data_start
1247     extern int data_start;
1248 #   define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
1249 #endif
1250
1251 # ifndef STACK_GROWS_UP
1252 #   define STACK_GROWS_DOWN
1253 # endif
1254
1255 # ifndef CPP_WORDSZ
1256 #   define CPP_WORDSZ 32
1257 # endif
1258
1259 # ifndef OS_TYPE
1260 #   define OS_TYPE ""
1261 # endif
1262
1263 # ifndef DATAEND
1264     extern int end;
1265 #   define DATAEND (&end)
1266 # endif
1267
1268 # if defined(SVR4) && !defined(GETPAGESIZE)
1269 #    include <unistd.h>
1270 #    define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
1271 # endif
1272
1273 # ifndef GETPAGESIZE
1274 #   if defined(SUNOS5) || defined(IRIX5)
1275 #       include <unistd.h>
1276 #   endif
1277 #   define GETPAGESIZE() getpagesize()
1278 # endif
1279
1280 # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
1281     /* OS has SVR4 generic features.  Probably others also qualify.     */
1282 #   define SVR4
1283 # endif
1284
1285 # if defined(SUNOS5) || defined(DRSNX)
1286     /* OS has SUNOS5 style semi-undocumented interface to dynamic       */
1287     /* loader.                                                          */
1288 #   define SUNOS5DL
1289     /* OS has SUNOS5 style signal handlers.                             */
1290 #   define SUNOS5SIGS
1291 # endif
1292
1293 # if defined(HPUX)
1294 #   define SUNOS5SIGS
1295 # endif
1296
1297 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
1298    -> bad word size
1299 # endif
1300
1301 # ifdef PCR
1302 #   undef DYNAMIC_LOADING
1303 #   undef STACKBOTTOM
1304 #   undef HEURISTIC1
1305 #   undef HEURISTIC2
1306 #   undef PROC_VDB
1307 #   undef MPROTECT_VDB
1308 #   define PCR_VDB
1309 # endif
1310
1311 # ifdef SRC_M3
1312 /* Postponed for now. */
1313 #   undef PROC_VDB
1314 #   undef MPROTECT_VDB
1315 # endif
1316
1317 # ifdef SMALL_CONFIG
1318 /* Presumably not worth the space it takes. */
1319 #   undef PROC_VDB
1320 #   undef MPROTECT_VDB
1321 # endif
1322
1323 # ifdef USE_MUNMAP
1324 #   undef MPROTECT_VDB  /* Can't deal with address space holes. */
1325 # endif
1326
1327 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
1328 #   define DEFAULT_VDB
1329 # endif
1330
1331 # ifndef PREFETCH
1332 #   define PREFETCH(x)
1333 #   define NO_PREFETCH
1334 # endif
1335
1336 # ifndef PREFETCH_FOR_WRITE
1337 #   define PREFETCH_FOR_WRITE(x)
1338 #   define NO_PREFETCH_FOR_WRITE
1339 # endif
1340
1341 # ifndef CACHE_LINE_SIZE
1342 #   define CACHE_LINE_SIZE 32   /* Wild guess   */
1343 # endif
1344
1345 # ifndef CLEAR_DOUBLE
1346 #   define CLEAR_DOUBLE(x) \
1347         ((word*)x)[0] = 0; \
1348         ((word*)x)[1] = 0;
1349 # endif /* CLEAR_DOUBLE */
1350
1351 # if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
1352 #   define SOLARIS_THREADS
1353 # endif
1354 # if defined(IRIX_THREADS) && !defined(IRIX5)
1355 --> inconsistent configuration
1356 # endif
1357 # if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
1358 --> inconsistent configuration
1359 # endif
1360 # if defined(LINUX_THREADS) && !defined(LINUX)
1361 --> inconsistent configuration
1362 # endif
1363 # if defined(SOLARIS_THREADS) && !defined(SUNOS5)
1364 --> inconsistent configuration
1365 # endif
1366 # if defined(HPUX_THREADS) && !defined(HPUX)
1367 --> inconsistent configuration
1368 # endif
1369 # if defined(PCR) || defined(SRC_M3) || \
1370         defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
1371         defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
1372         defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
1373 #   define THREADS
1374 # endif
1375
1376 # if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
1377      || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
1378         /* Use setjmp based hack to mark from callee-save registers. */
1379 #       define USE_GENERIC_PUSH_REGS
1380 # endif
1381 # if defined(SPARC)
1382 #   define SAVE_CALL_CHAIN
1383 #   define ASM_CLEAR_CODE       /* Stack clearing is crucial, and we    */
1384                                 /* include assembly code to do it well. */
1385 # endif
1386
1387 # endif /* GCCONFIG_H */