boehm-gc/gcconfig.h

   1 /*
   2  * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
   3  * Copyright (c) 1991-1994 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
 301 /* Feel free to add more clauses here */
 302
 303 /* Or manually define the machine type here.  A machine type is         */
 304 /* characterized by the architecture.  Some                             */
 305 /* machine types are further subdivided by OS.                          */
 306 /* the macros ULTRIX, RISCOS, and BSD to distinguish.                   */
 307 /* Note that SGI IRIX is treated identically to RISCOS.                 */
 308 /* SYSV on an M68K actually means A/UX.                                 */
 309 /* The distinction in these cases is usually the stack starting address */
 310 # ifndef mach_type_known
 311         --> unknown machine type
 312 # endif
 313                     /* Mapping is: M68K       ==> Motorola 680X0        */
 314                     /*             (SUNOS4,HP,NEXT, and SYSV (A/UX),    */
 315                     /*             MACOS and AMIGA variants)            */
 316                     /*             I386       ==> Intel 386             */
 317                     /*              (SEQUENT, OS2, SCO, LINUX, NETBSD,  */
 318                     /*               FREEBSD, THREE86BSD, MSWIN32,      */
 319                     /*               BSDI,SUNOS5, NEXT, other variants) */
 320                     /*             NS32K      ==> Encore Multimax       */
 321                     /*             MIPS       ==> R2000 or R3000        */
 322                     /*                  (RISCOS, ULTRIX variants)       */
 323                     /*             VAX        ==> DEC VAX               */
 324                     /*                  (BSD, ULTRIX variants)          */
 325                     /*             RS6000     ==> IBM RS/6000 AIX3.X    */
 326                     /*             RT         ==> IBM PC/RT             */
 327                     /*             HP_PA      ==> HP9000/700 & /800     */
 328                     /*                            HP/UX                 */
 329                     /*             SPARC      ==> SPARC v7/v8/v9        */
 330                     /*                  (SUNOS4, SUNOS5, LINUX,         */
 331                     /*                   DRSNX variants)                */
 332                     /*             ALPHA      ==> DEC Alpha             */
 333                     /*                  (OSF1 and LINUX variants)       */
 334                     /*             M88K       ==> Motorola 88XX0        */
 335                     /*                  (CX_UX and DGUX)                */
 336                     /*             S370       ==> 370-like machine      */
 337                     /*                  running Amdahl UTS4             */
 338                     /*             ARM32      ==> Intel StrongARM       */
 339                     /*             IA64       ==> Intel IA64            */
 340                     /*                            (e.g. Itanium)        */
 341
 342
 343 /*
 344  * For each architecture and OS, the following need to be defined:
 345  *
 346  * CPP_WORD_SZ is a simple integer constant representing the word size.
 347  * in bits.  We assume byte addressibility, where a byte has 8 bits.
 348  * We also assume CPP_WORD_SZ is either 32 or 64.
 349  * (We care about the length of pointers, not hardware
 350  * bus widths.  Thus a 64 bit processor with a C compiler that uses
 351  * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
 352  *
 353  * MACH_TYPE is a string representation of the machine type.
 354  * OS_TYPE is analogous for the OS.
 355  *
 356  * ALIGNMENT is the largest N, such that
 357  * all pointer are guaranteed to be aligned on N byte boundaries.
 358  * defining it to be 1 will always work, but perform poorly.
 359  *
 360  * DATASTART is the beginning of the data segment.
 361  * On UNIX systems, the collector will scan the area between DATASTART
 362  * and DATAEND for root pointers.
 363  *
 364  * DATAEND, if not &end.
 365  *
 366  * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
 367  * the pointer size.
 368  *
 369  * STACKBOTTOM is the cool end of the stack, which is usually the
 370  * highest address in the stack.
 371  * Under PCR or OS/2, we have other ways of finding thread stacks.
 372  * For each machine, the following should:
 373  * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
 374  * 2) define exactly one of
 375  *      STACKBOTTOM (should be defined to be an expression)
 376  *      HEURISTIC1
 377  *      HEURISTIC2
 378  * If either of the last two macros are defined, then STACKBOTTOM is computed
 379  * during collector startup using one of the following two heuristics:
 380  * HEURISTIC1:  Take an address inside GC_init's frame, and round it up to
 381  *              the next multiple of STACK_GRAN.
 382  * HEURISTIC2:  Take an address inside GC_init's frame, increment it repeatedly
 383  *              in small steps (decrement if STACK_GROWS_UP), and read the value
 384  *              at each location.  Remember the value when the first
 385  *              Segmentation violation or Bus error is signalled.  Round that
 386  *              to the nearest plausible page boundary, and use that instead
 387  *              of STACKBOTTOM.
 388  *
 389  * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
 390  * the value of environ is a pointer that can serve as STACKBOTTOM.
 391  * I expect that HEURISTIC2 can be replaced by this approach, which
 392  * interferes far less with debugging.
 393  *
 394  * If no expression for STACKBOTTOM can be found, and neither of the above
 395  * heuristics are usable, the collector can still be used with all of the above
 396  * undefined, provided one of the following is done:
 397  * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
 398  *    without reference to STACKBOTTOM.  This is appropriate for use in
 399  *    conjunction with thread packages, since there will be multiple stacks.
 400  *    (Allocating thread stacks in the heap, and treating them as ordinary
 401  *    heap data objects is also possible as a last resort.  However, this is
 402  *    likely to introduce significant amounts of excess storage retention
 403  *    unless the dead parts of the thread stacks are periodically cleared.)
 404  * 2) Client code may set GC_stackbottom before calling any GC_ routines.
 405  *    If the author of the client code controls the main program, this is
 406  *    easily accomplished by introducing a new main program, setting
 407  *    GC_stackbottom to the address of a local variable, and then calling
 408  *    the original main program.  The new main program would read something
 409  *    like:
 410  *
 411  *              # include "gc_private.h"
 412  *
 413  *              main(argc, argv, envp)
 414  *              int argc;
 415  *              char **argv, **envp;
 416  *              {
 417  *                  int dummy;
 418  *
 419  *                  GC_stackbottom = (ptr_t)(&dummy);
 420  *                  return(real_main(argc, argv, envp));
 421  *              }
 422  *
 423  *
 424  * Each architecture may also define the style of virtual dirty bit
 425  * implementation to be used:
 426  *   MPROTECT_VDB: Write protect the heap and catch faults.
 427  *   PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
 428  *
 429  * An architecture may define DYNAMIC_LOADING if dynamic_load.c
 430  * defined GC_register_dynamic_libraries() for the architecture.
 431  *
 432  * An architecture may define PREFETCH(x) to preload the cache with *x.
 433  * This defaults to a no-op.
 434  *
 435  * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
 436  *
 437  * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
 438  * clear the two words at GC_malloc-aligned address x.  By default,
 439  * word stores of 0 are used instead.
 440  */
 441
 442
 443 # define STACK_GRAN 0x1000000
 444 # ifdef M68K
 445 #   define MACH_TYPE "M68K"
 446 #   define ALIGNMENT 2
 447 #   ifdef OPENBSD
 448 #       define OS_TYPE "OPENBSD"
 449 #       define HEURISTIC2
 450         extern char etext;
 451 #       define DATASTART ((ptr_t)(&etext))
 452 #   endif
 453 #   ifdef NETBSD
 454 #       define OS_TYPE "NETBSD"
 455 #       define HEURISTIC2
 456         extern char etext;
 457 #       define DATASTART ((ptr_t)(&etext))
 458 #   endif
 459 #   ifdef LINUX
 460 #       define OS_TYPE "LINUX"
 461 #       define STACKBOTTOM ((ptr_t)0xf0000000)
 462 #       define MPROTECT_VDB
 463 #       ifdef __ELF__
 464 #            define DYNAMIC_LOADING
 465              extern char **__environ;
 466 #            define DATASTART ((ptr_t)(&__environ))
 467                              /* hideous kludge: __environ is the first */
 468                              /* word in crt0.o, and delimits the start */
 469                              /* of the data segment, no matter which   */
 470                              /* ld options were passed through.        */
 471                              /* We could use _etext instead, but that  */
 472                              /* would include .rodata, which may       */
 473                              /* contain large read-only data tables    */
 474                              /* that we'd rather not scan.             */
 475              extern int _end;
 476 #            define DATAEND (&_end)
 477 #       else
 478              extern int etext;
 479 #            define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 480 #       endif
 481 #   endif
 482 #   ifdef SUNOS4
 483 #       define OS_TYPE "SUNOS4"
 484         extern char etext;
 485 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
 486 #       define HEURISTIC1       /* differs      */
 487 #       define DYNAMIC_LOADING
 488 #   endif
 489 #   ifdef HP
 490 #       define OS_TYPE "HP"
 491         extern char etext;
 492 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 493 #       define STACKBOTTOM ((ptr_t) 0xffeffffc)
 494                               /* empirically determined.  seems to work. */
 495 #       include <unistd.h>
 496 #       define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
 497 #   endif
 498 #   ifdef SYSV
 499 #       define OS_TYPE "SYSV"
 500         extern etext;
 501 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
 502                                    & ~0x3fffff) \
 503                                   +((word)&etext & 0x1fff))
 504         /* This only works for shared-text binaries with magic number 0413.
 505            The other sorts of SysV binaries put the data at the end of the text,
 506            in which case the default of &etext would work.  Unfortunately,
 507            handling both would require having the magic-number available.
 508                                 -- Parag
 509            */
 510 #       define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
 511                         /* The stack starts at the top of memory, but   */
 512                         /* 0x0 cannot be used as setjump_test complains */
 513                         /* that the stack direction is incorrect.  Two  */
 514                         /* bytes down from 0x0 should be safe enough.   */
 515                         /*              --Parag                         */
 516 #       include <sys/mmu.h>
 517 #       define GETPAGESIZE() PAGESIZE   /* Is this still right? */
 518 #   endif
 519 #   ifdef AMIGA
 520 #       define OS_TYPE "AMIGA"
 521                 /* STACKBOTTOM and DATASTART handled specially  */
 522                 /* in os_dep.c                                  */
 523 #       define DATAEND  /* not needed */
 524 #       define GETPAGESIZE() 4096
 525 #   endif
 526 #   ifdef MACOS
 527 #     ifndef __LOWMEM__
 528 #     include <LowMem.h>
 529 #     endif
 530 #     define OS_TYPE "MACOS"
 531                         /* see os_dep.c for details of global data segments. */
 532 #     define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
 533 #     define DATAEND    /* not needed */
 534 #     define GETPAGESIZE() 4096
 535 #   endif
 536 #   ifdef NEXT
 537 #       define OS_TYPE "NEXT"
 538 #       define DATASTART ((ptr_t) get_etext())
 539 #       define STACKBOTTOM ((ptr_t) 0x4000000)
 540 #       define DATAEND  /* not needed */
 541 #   endif
 542 # endif
 543
 544 # ifdef POWERPC
 545 #   define MACH_TYPE "POWERPC"
 546 #   ifdef MACOS
 547 #     define ALIGNMENT 2  /* Still necessary?  Could it be 4?   */
 548 #     ifndef __LOWMEM__
 549 #     include <LowMem.h>
 550 #     endif
 551 #     define OS_TYPE "MACOS"
 552                         /* see os_dep.c for details of global data segments. */
 553 #     define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
 554 #     define DATAEND  /* not needed */
 555 #   endif
 556 #   ifdef LINUX
 557 #     define ALIGNMENT 4        /* Guess.  Can someone verify?  */
 558                                 /* This was 2, but that didn't sound right. */
 559 #     define OS_TYPE "LINUX"
 560 #     define HEURISTIC1
 561 #     define DYNAMIC_LOADING
 562 #     undef STACK_GRAN
 563 #     define STACK_GRAN 0x10000000
 564         /* Stack usually starts at 0x80000000 */
 565 #     define LINUX_DATA_START
 566       extern int _end;
 567 #     define DATAEND (&_end)
 568 #   endif
 569 #   ifdef MACOSX
 570 #     define ALIGNMENT 4
 571 #     define OS_TYPE "MACOSX"
 572 #     define DATASTART ((ptr_t) get_etext())
 573 #     define STACKBOTTOM ((ptr_t) 0xc0000000)
 574 #     define DATAEND    /* not needed */
 575 #   endif
 576 # endif
 577
 578 # ifdef VAX
 579 #   define MACH_TYPE "VAX"
 580 #   define ALIGNMENT 4  /* Pointers are longword aligned by 4.2 C compiler */
 581     extern char etext;
 582 #   define DATASTART ((ptr_t)(&etext))
 583 #   ifdef BSD
 584 #       define OS_TYPE "BSD"
 585 #       define HEURISTIC1
 586                         /* HEURISTIC2 may be OK, but it's hard to test. */
 587 #   endif
 588 #   ifdef ULTRIX
 589 #       define OS_TYPE "ULTRIX"
 590 #       define STACKBOTTOM ((ptr_t) 0x7fffc800)
 591 #   endif
 592 # endif
 593
 594 # ifdef RT
 595 #   define MACH_TYPE "RT"
 596 #   define ALIGNMENT 4
 597 #   define DATASTART ((ptr_t) 0x10000000)
 598 #   define STACKBOTTOM ((ptr_t) 0x1fffd800)
 599 # endif
 600
 601 # ifdef SPARC
 602 #   define MACH_TYPE "SPARC"
 603 #   if defined(__arch64__) || defined(__sparcv9)
 604 #     define ALIGNMENT 8
 605 #   else
 606 #     define ALIGNMENT 4        /* Required by hardware */
 607 #   endif
 608 #   define ALIGN_DOUBLE
 609     extern int etext;
 610 #   ifdef SUNOS5
 611 #       define OS_TYPE "SUNOS5"
 612         extern int _etext;
 613         extern int _end;
 614         extern char * GC_SysVGetDataStart();
 615 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
 616 #       define DATAEND (&_end)
 617 #       ifndef USE_MMAP
 618 #           define USE_MMAP
 619 #       endif
 620 #       ifdef USE_MMAP
 621 #         define HEAP_START (ptr_t)0x40000000
 622 #       else
 623 #         define HEAP_START DATAEND
 624 #       endif
 625 #       define PROC_VDB
 626 /*      HEURISTIC1 reportedly no longer works under 2.7.  Thus we       */
 627 /*      switched to HEURISTIC2, eventhough it creates some debugging    */
 628 /*      issues.                                                         */
 629 #       define HEURISTIC2
 630 #       include <unistd.h>
 631 #       define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
 632                 /* getpagesize() appeared to be missing from at least one */
 633                 /* Solaris 5.4 installation.  Weird.                      */
 634 #       define DYNAMIC_LOADING
 635 #   endif
 636 #   ifdef SUNOS4
 637 #       define OS_TYPE "SUNOS4"
 638         /* [If you have a weak stomach, don't read this.]               */
 639         /* We would like to use:                                        */
 640 /* #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
 641         /* This fails occasionally, due to an ancient, but very         */
 642         /* persistent ld bug.  &etext is set 32 bytes too high.         */
 643         /* We instead read the text segment size from the a.out         */
 644         /* header, which happens to be mapped into our address space    */
 645         /* at the start of the text segment.  The detective work here   */
 646         /* was done by Robert Ehrlich, Manuel Serrano, and Bernard      */
 647         /* Serpette of INRIA.                                           */
 648         /* This assumes ZMAGIC, i.e. demand-loadable executables.       */
 649 #       define TEXTSTART 0x2000
 650 #       define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
 651 #       define MPROTECT_VDB
 652 #       define HEURISTIC1
 653 #       define DYNAMIC_LOADING
 654 #   endif
 655 #   ifdef DRSNX
 656 #       define CPP_WORDSZ 32
 657 #       define OS_TYPE "DRSNX"
 658         extern char * GC_SysVGetDataStart();
 659         extern int etext;
 660 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
 661 #       define MPROTECT_VDB
 662 #       define STACKBOTTOM ((ptr_t) 0xdfff0000)
 663 #       define DYNAMIC_LOADING
 664 #   endif
 665 #   ifdef LINUX
 666 #     define OS_TYPE "LINUX"
 667 #     ifdef __ELF__
 668 #       define DYNAMIC_LOADING
 669 #     else
 670           Linux Sparc/a.out not supported
 671 #     endif
 672       extern int _etext;
 673       extern int _end;
 674 #     define DATAEND (&_end)
 675 #     define SVR4
 676 #     ifdef __arch64__
 677 #       define STACKBOTTOM ((ptr_t) 0x80000000000ULL)
 678 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x100000, &_etext)
 679 #       define CPP_WORDSZ 64
 680 #     else
 681 #       define STACKBOTTOM ((ptr_t) 0xf0000000)
 682 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
 683 #     endif
 684 #   endif
 685 #   ifdef OPENBSD
 686 #     define OS_TYPE "OPENBSD"
 687 #     define STACKBOTTOM ((ptr_t) 0xf8000000)
 688 #     define DATASTART ((ptr_t)(&etext))
 689 #   endif
 690 # endif
 691
 692 # ifdef I386
 693 #   define MACH_TYPE "I386"
 694 #   define ALIGNMENT 4  /* Appears to hold for all "32 bit" compilers   */
 695                         /* except Borland.  The -a4 option fixes        */
 696                         /* Borland.                                     */
 697                         /* Ivan Demakov: For Watcom the option is -zp4. */
 698 #   ifndef SMALL_CONFIG
 699 #     define ALIGN_DOUBLE /* Not strictly necessary, but may give speed   */
 700                           /* improvement on Pentiums.                     */
 701 #   endif
 702 #   ifdef SEQUENT
 703 #       define OS_TYPE "SEQUENT"
 704         extern int etext;
 705 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 706 #       define STACKBOTTOM ((ptr_t) 0x3ffff000)
 707 #   endif
 708 #   ifdef SUNOS5
 709 #       define OS_TYPE "SUNOS5"
 710         extern int etext, _start;
 711         extern char * GC_SysVGetDataStart();
 712 #       define DATASTART GC_SysVGetDataStart(0x1000, &etext)
 713 #       define STACKBOTTOM ((ptr_t)(&_start))
 714 /** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
 715 /*#     define PROC_VDB*/
 716 #       define DYNAMIC_LOADING
 717 #       ifndef USE_MMAP
 718 #           define USE_MMAP
 719 #       endif
 720 #       ifdef USE_MMAP
 721 #         define HEAP_START (ptr_t)0x40000000
 722 #       else
 723 #         define HEAP_START DATAEND
 724 #       endif
 725 #   endif
 726 #   ifdef SCO
 727 #       define OS_TYPE "SCO"
 728         extern int etext;
 729 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
 730                                   & ~0x3fffff) \
 731                                  +((word)&etext & 0xfff))
 732 #       define STACKBOTTOM ((ptr_t) 0x7ffffffc)
 733 #   endif
 734 #   ifdef SCO_ELF
 735 #       define OS_TYPE "SCO_ELF"
 736         extern int etext;
 737 #       define DATASTART ((ptr_t)(&etext))
 738 #       define STACKBOTTOM ((ptr_t) 0x08048000)
 739 #       define DYNAMIC_LOADING
 740 #       define ELF_CLASS ELFCLASS32
 741 #   endif
 742 #   ifdef LINUX
 743 #       define OS_TYPE "LINUX"
 744 #       define LINUX_STACKBOTTOM
 745 #       if 0
 746 #         define HEURISTIC1
 747 #         undef STACK_GRAN
 748 #         define STACK_GRAN 0x10000000
 749           /* STACKBOTTOM is usually 0xc0000000, but this changes with   */
 750           /* different kernel configurations.  In particular, systems   */
 751           /* with 2GB physical memory will usually move the user        */
 752           /* address space limit, and hence initial SP to 0x80000000.   */
 753 #       endif
 754 #       if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
 755         /* libgcj: Linux threads don't interact well with the read() wrapper.
 756            Not defining MPROTECT_VDB fixes this.  */
 757 /* #        define MPROTECT_VDB */
 758 #       else
 759             /* We seem to get random errors in incremental mode,        */
 760             /* possibly because Linux threads is itself a malloc client */
 761             /* and can't deal with the signals.                         */
 762 #       endif
 763 #       ifdef __ELF__
 764 #            define DYNAMIC_LOADING
 765 #            ifdef UNDEFINED    /* includes ro data */
 766                extern int _etext;
 767 #              define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
 768 #            endif
 769 #            include <features.h>
 770 #            if defined(__GLIBC__) && __GLIBC__ >= 2
 771 #                define LINUX_DATA_START
 772 #            else
 773                  extern char **__environ;
 774 #                define DATASTART ((ptr_t)(&__environ))
 775                               /* hideous kludge: __environ is the first */
 776                               /* word in crt0.o, and delimits the start */
 777                               /* of the data segment, no matter which   */
 778                               /* ld options were passed through.        */
 779                               /* We could use _etext instead, but that  */
 780                               /* would include .rodata, which may       */
 781                               /* contain large read-only data tables    */
 782                               /* that we'd rather not scan.             */
 783 #            endif
 784              extern int _end;
 785 #            define DATAEND (&_end)
 786 #       else
 787              extern int etext;
 788 #            define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 789 #       endif
 790 #       ifdef USE_I686_PREFETCH
 791 #         define PREFETCH(x) \
 792             __asm__ __volatile__ ("     prefetchnta     %0": : "m"(*(char *)(x)))
 793             /* Empirically prefetcht0 is much more effective at reducing        */
 794             /* cache miss stalls for the targetted load instructions.  But it   */
 795             /* seems to interfere enough with other cache traffic that the net  */
 796             /* result is worse than prefetchnta.                                */
 797 #         if 0
 798             /* Using prefetches for write seems to have a slight negative       */
 799             /* impact on performance, at least for a PIII/500.                  */
 800 #           define PREFETCH_FOR_WRITE(x) \
 801               __asm__ __volatile__ ("   prefetcht0      %0": : "m"(*(char *)(x)))
 802 #         endif
 803 #       endif
 804 #       ifdef USE_3DNOW_PREFETCH
 805 #         define PREFETCH(x) \
 806             __asm__ __volatile__ ("     prefetch        %0": : "m"(*(char *)(x)))
 807 #         define PREFETCH_FOR_WRITE(x)
 808             __asm__ __volatile__ ("     prefetchw       %0": : "m"(*(char *)(x)))
 809 #       endif
 810 #   endif
 811 #   ifdef CYGWIN32
 812 #       define OS_TYPE "CYGWIN32"
 813           extern int _data_start__;
 814           extern int _data_end__;
 815           extern int _bss_start__;
 816           extern int _bss_end__;
 817         /* For binutils 2.9.1, we have                  */
 818         /*      DATASTART   = _data_start__             */
 819         /*      DATAEND     = _bss_end__                */
 820         /* whereas for some earlier versions it was     */
 821         /*      DATASTART   = _bss_start__              */
 822         /*      DATAEND     = _data_end__               */
 823         /* To get it right for both, we take the        */
 824         /* minumum/maximum of the two.                  */
 825 #       define MAX(x,y) ((x) > (y) ? (x) : (y))
 826 #       define MIN(x,y) ((x) < (y) ? (x) : (y))
 827 #       define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
 828 #       define DATAEND   ((ptr_t) MAX(&_data_end__, &_bss_end__))
 829 #       undef STACK_GRAN
 830 #       define STACK_GRAN 0x10000
 831 #       define HEURISTIC1
 832 #   endif
 833 #   ifdef OS2
 834 #       define OS_TYPE "OS2"
 835                 /* STACKBOTTOM and DATASTART are handled specially in   */
 836                 /* os_dep.c. OS2 actually has the right                 */
 837                 /* system call!                                         */
 838 #       define DATAEND  /* not needed */
 839 #   endif
 840 #   ifdef MSWIN32
 841 #       define OS_TYPE "MSWIN32"
 842                 /* STACKBOTTOM and DATASTART are handled specially in   */
 843                 /* os_dep.c.                                            */
 844 #       ifndef __WATCOMC__
 845 #         define MPROTECT_VDB
 846 #       endif
 847 #       define DATAEND  /* not needed */
 848 #   endif
 849 #   ifdef DJGPP
 850 #       define OS_TYPE "DJGPP"
 851 #       include "stubinfo.h"
 852         extern int etext;
 853         extern int _stklen;
 854         extern int __djgpp_stack_limit;
 855 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
 856 /* #       define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
 857                                                      + _stklen)) */
 858 #       define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
 859                 /* This may not be right.  */
 860 #   endif
 861 #   ifdef OPENBSD
 862 #       define OS_TYPE "OPENBSD"
 863 #   endif
 864 #   ifdef FREEBSD
 865 #       define OS_TYPE "FREEBSD"
 866 #       define MPROTECT_VDB
 867 #   endif
 868 #   ifdef NETBSD
 869 #       define OS_TYPE "NETBSD"
 870 #   endif
 871 #   ifdef THREE86BSD
 872 #       define OS_TYPE "THREE86BSD"
 873 #   endif
 874 #   ifdef BSDI
 875 #       define OS_TYPE "BSDI"
 876 #   endif
 877 #   if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
 878         || defined(THREE86BSD) || defined(BSDI)
 879 #       define HEURISTIC2
 880         extern char etext;
 881 #       define DATASTART ((ptr_t)(&etext))
 882 #   endif
 883 #   ifdef NEXT
 884 #       define OS_TYPE "NEXT"
 885 #       define DATASTART ((ptr_t) get_etext())
 886 #       define STACKBOTTOM ((ptr_t)0xc0000000)
 887 #       define DATAEND  /* not needed */
 888 #   endif
 889 #   ifdef DOS4GW
 890 #     define OS_TYPE "DOS4GW"
 891       extern long __nullarea;
 892       extern char _end;
 893       extern char *_STACKTOP;
 894       /* Depending on calling conventions Watcom C either precedes
 895          or does not precedes with undescore names of C-variables.
 896          Make sure startup code variables always have the same names.  */
 897       #pragma aux __nullarea "*";
 898       #pragma aux _end "*";
 899 #     define STACKBOTTOM ((ptr_t) _STACKTOP)
 900                          /* confused? me too. */
 901 #     define DATASTART ((ptr_t) &__nullarea)
 902 #     define DATAEND ((ptr_t) &_end)
 903 #   endif
 904 # endif
 905
 906 # ifdef NS32K
 907 #   define MACH_TYPE "NS32K"
 908 #   define ALIGNMENT 4
 909     extern char **environ;
 910 #   define DATASTART ((ptr_t)(&environ))
 911                               /* hideous kludge: environ is the first   */
 912                               /* word in crt0.o, and delimits the start */
 913                               /* of the data segment, no matter which   */
 914                               /* ld options were passed through.        */
 915 #   define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
 916 # endif
 917
 918 # ifdef MIPS
 919 # ifndef ECOS
 920 #   define MACH_TYPE "MIPS"
 921         /* LIBGCJ LOCAL: respect predefined DATASTART_IS_ETEXT.  */
 922 #   ifdef DATASTART_IS_ETEXT
 923         extern int _etext;
 924 #     define DATASTART ((ptr_t)(&_etext))
 925 #   else
 926 /* #   define STACKBOTTOM ((ptr_t)0x7fff8000)  sometimes also works.  */
 927 #   ifdef LINUX
 928       /* This was developed for a linuxce style platform.  Probably     */
 929       /* needs to be tweaked for workstation class machines.            */
 930 #     define OS_TYPE "LINUX"
 931       extern int __data_start;
 932 #     define DATASTART ((ptr_t)(&__data_start))
 933 #     define ALIGNMENT 4
 934 #     define USE_GENERIC_PUSH_REGS 1
 935 #     define STACKBOTTOM 0x80000000
 936         /* In many cases, this should probably use LINUX_STACKBOTTOM    */
 937         /* instead. But some kernel versions seem to give the wrong     */
 938         /* value from /proc.                                            */
 939 #   endif /* Linux */
 940 #   ifdef ULTRIX
 941 #       define HEURISTIC2
 942 #       define DATASTART (ptr_t)0x10000000
 943                               /* Could probably be slightly higher since */
 944                               /* startup code allocates lots of stuff.   */
 945 #       define OS_TYPE "ULTRIX"
 946 #       define ALIGNMENT 4
 947 #   endif
 948 #   ifdef RISCOS
 949 #       define HEURISTIC2
 950 #       define DATASTART (ptr_t)0x10000000
 951 #       define OS_TYPE "RISCOS"
 952 #       define ALIGNMENT 4  /* Required by hardware */
 953 #   endif
 954 #   ifdef IRIX5
 955 #       define HEURISTIC2
 956         extern int _fdata;
 957 #       define DATASTART ((ptr_t)(&_fdata))
 958 #       ifdef USE_MMAP
 959 #         define HEAP_START (ptr_t)0x30000000
 960 #       else
 961 #         define HEAP_START DATASTART
 962 #       endif
 963                               /* Lowest plausible heap address.         */
 964                               /* In the MMAP case, we map there.        */
 965                               /* In either case it is used to identify  */
 966                               /* heap sections so they're not           */
 967                               /* considered as roots.                   */
 968 #       define OS_TYPE "IRIX5"
 969 #       define MPROTECT_VDB
 970 #       ifdef _MIPS_SZPTR
 971 #         define CPP_WORDSZ _MIPS_SZPTR
 972 #         define ALIGNMENT (_MIPS_SZPTR/8)
 973 #         if CPP_WORDSZ != 64
 974 #           define ALIGN_DOUBLE
 975 #         endif
 976 #       else
 977 #         define ALIGNMENT 4
 978 #         define ALIGN_DOUBLE
 979 #       endif
 980 #       define DYNAMIC_LOADING
 981 #   endif
 982 #   endif /* DATASTART_IS_ETEXT */
 983 #   endif /* ECOS */
 984 # ifdef ECOS
 985     extern char __ram_data_start;
 986     extern char __ram_data_end;
 987 #   define MACH_TYPE "MIPS"
 988 #   define DATASTART (ptr_t)(&__ram_data_start)
 989 #   define DATAEND (ptr_t)(&__ram_data_end)
 990
 991 #   define HEURISTIC2
 992 #   define ALIGNMENT 4
 993 #   define ALIGN_DOUBLE
 994 #   endif /* ECOS */
 995 # endif
 996
 997 # ifdef RS6000
 998 #   define MACH_TYPE "RS6000"
 999 #   define ALIGNMENT 4
1000 #   define DATASTART ((ptr_t)0x20000000)
1001     extern int errno;
1002 #   define STACKBOTTOM ((ptr_t)((ulong)&errno))
1003 #   define DYNAMIC_LOADING
1004         /* For really old versions of AIX, this may have to be removed. */
1005 # endif
1006
1007 # ifdef HP_PA
1008     /* OS is assumed to be HP/UX        */
1009 #   define MACH_TYPE "HP_PA"
1010 #   define OS_TYPE "HPUX"
1011 #   ifdef __LP64__
1012 #     define CPP_WORDSZ 64
1013 #     define ALIGNMENT 8
1014 #   else
1015 #     define CPP_WORDSZ 32
1016 #     define ALIGNMENT 4
1017 #     define ALIGN_DOUBLE
1018 #   endif
1019     extern int __data_start;
1020 #   define DATASTART ((ptr_t)(&__data_start))
1021 #   if 0
1022         /* The following appears to work for 7xx systems running HP/UX  */
1023         /* 9.xx Furthermore, it might result in much faster             */
1024         /* collections than HEURISTIC2, which may involve scanning      */
1025         /* segments that directly precede the stack.  It is not the     */
1026         /* default, since it may not work on older machine/OS           */
1027         /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1028         /* this.)                                                       */
1029 #       define STACKBOTTOM ((ptr_t) 0x7b033000)  /* from /etc/conf/h/param.h */
1030 #   else
1031         /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2       */
1032         /* to this.  We'll probably do this on other platforms, too.    */
1033         /* For now I'll use it where I can test it.                     */
1034         extern char ** environ;
1035 #       define STACKBOTTOM ((ptr_t)environ)
1036 #   endif
1037 #   define STACK_GROWS_UP
1038 #   define DYNAMIC_LOADING
1039 #   ifndef HPUX_THREADS
1040 #     define MPROTECT_VDB
1041 #   endif
1042 #   include <unistd.h>
1043 #   define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1044 # endif
1045
1046 # ifdef ALPHA
1047 #   define MACH_TYPE "ALPHA"
1048 #   define ALIGNMENT 8
1049 #   define USE_GENERIC_PUSH_REGS
1050         /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1051         /* fp registers in some cases when the target is a 21264.  The assembly */
1052         /* code doesn't handle that yet, and version dependencies make that a   */
1053         /* bit tricky.  Do the easy thing for now.                              */
1054 #   ifdef OSF1
1055 #       define OS_TYPE "OSF1"
1056 #       define DATASTART ((ptr_t) 0x140000000)
1057         extern int _end;
1058 #       define DATAEND ((ptr_t) &_end)
1059 #       define HEURISTIC2
1060         /* Normally HEURISTIC2 is too conervative, since                */
1061         /* the text segment immediately follows the stack.              */
1062         /* Hence we give an upper pound.                                */
1063         extern int __start;
1064 #       define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
1065 #       define CPP_WORDSZ 64
1066 #       define MPROTECT_VDB
1067 #       define DYNAMIC_LOADING
1068 #   endif
1069 #   ifdef LINUX
1070 #       define OS_TYPE "LINUX"
1071 #       define CPP_WORDSZ 64
1072 #       define STACKBOTTOM ((ptr_t) 0x120000000)
1073 #       ifdef __ELF__
1074 #         define LINUX_DATA_START
1075 #         define DYNAMIC_LOADING
1076           /* This doesn't work if the collector is in a dynamic library. */
1077 #       else
1078 #           define DATASTART ((ptr_t) 0x140000000)
1079 #       endif
1080         extern int _end;
1081 #       define DATAEND (&_end)
1082 #       undef MPROTECT_VDB
1083                 /* Has only been superficially tested.  May not */
1084                 /* work on all versions.                        */
1085 #   endif
1086 # endif
1087
1088 # ifdef IA64
1089 #   define MACH_TYPE "IA64"
1090 #   define ALIGN_DOUBLE
1091         /* Requires 16 byte alignment for malloc */
1092 #   define ALIGNMENT 8
1093 #   define USE_GENERIC_PUSH_REGS
1094         /* We need to get preserved registers in addition to register windows.  */
1095         /* That's easiest to do with setjmp.                                    */
1096 #   ifdef HPUX
1097         --> needs work
1098 #   endif
1099 #   ifdef LINUX
1100 #       define OS_TYPE "LINUX"
1101 #       define CPP_WORDSZ 64
1102         /* This should really be done through /proc, but that   */
1103         /* requires we run on an IA64 kernel.                   */
1104 #       define STACKBOTTOM ((ptr_t) 0xa000000000000000l)
1105         /* We also need the base address of the register stack  */
1106         /* backing store.  There is probably a better way to    */
1107         /* get that, too ...                                    */
1108 #       define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l)
1109 #       if 1
1110 #           define SEARCH_FOR_DATA_START
1111 #           define DATASTART GC_data_start
1112 #       else
1113             extern int data_start;
1114 #           define DATASTART ((ptr_t)(&data_start))
1115 #       endif
1116 #       define DYNAMIC_LOADING
1117 #       define MPROTECT_VDB
1118                 /* Requires Linux 2.3.47 or later.      */
1119         extern int _end;
1120 #       define DATAEND (&_end)
1121 #       define PREFETCH(x) \
1122           __asm__ ("    lfetch  [%0]": : "r"((void *)(x)))
1123 #       define PREFETCH_FOR_WRITE(x) \
1124           __asm__ ("    lfetch.excl     [%0]": : "r"((void *)(x)))
1125 #       define CLEAR_DOUBLE(x) \
1126           __asm__ ("    stf.spill       [%0]=f0": : "r"((void *)(x)))
1127 #   endif
1128 # endif
1129
1130 # ifdef M88K
1131 #   define MACH_TYPE "M88K"
1132 #   define ALIGNMENT 4
1133 #   define ALIGN_DOUBLE
1134     extern int etext;
1135 #   ifdef CX_UX
1136 #       define OS_TYPE "CX_UX"
1137 #       define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1138 #   endif
1139 #   ifdef  DGUX
1140 #       define OS_TYPE "DGUX"
1141         extern char * GC_SysVGetDataStart();
1142 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
1143 #   endif
1144 #   define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1145 # endif
1146
1147 # ifdef S370
1148 #   define MACH_TYPE "S370"
1149 #   define OS_TYPE "UTS4"
1150 #   define ALIGNMENT 4  /* Required by hardware */
1151     extern int etext;
1152         extern int _etext;
1153         extern int _end;
1154         extern char * GC_SysVGetDataStart();
1155 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
1156 #       define DATAEND (&_end)
1157 #       define HEURISTIC2
1158 # endif
1159
1160 # if defined(PJ)
1161 #   define ALIGNMENT 4
1162     extern int _etext;
1163 #   define DATASTART ((ptr_t)(&_etext))
1164 #   define HEURISTIC1
1165 # endif
1166
1167 # ifdef ARM32
1168 #   define CPP_WORDSZ 32
1169 #   define MACH_TYPE "ARM32"
1170 #   define ALIGNMENT 4
1171 #   ifdef NETBSD
1172 #       define OS_TYPE "NETBSD"
1173 #       define HEURISTIC2
1174         extern char etext;
1175 #       define DATASTART ((ptr_t)(&etext))
1176 #       define USE_GENERIC_PUSH_REGS
1177 #   endif
1178 #   ifdef LINUX
1179 #       define OS_TYPE "LINUX"
1180 #       define HEURISTIC1
1181 #       undef STACK_GRAN
1182 #       define STACK_GRAN 0x10000000
1183 #       define USE_GENERIC_PUSH_REGS
1184 #       ifdef __ELF__
1185 #            define DYNAMIC_LOADING
1186 #            include <features.h>
1187 #            if defined(__GLIBC__) && __GLIBC__ >= 2
1188 #                define LINUX_DATA_START
1189 #            else
1190                  extern char **__environ;
1191 #                define DATASTART ((ptr_t)(&__environ))
1192                               /* hideous kludge: __environ is the first */
1193                               /* word in crt0.o, and delimits the start */
1194                               /* of the data segment, no matter which   */
1195                               /* ld options were passed through.        */
1196                               /* We could use _etext instead, but that  */
1197                               /* would include .rodata, which may       */
1198                               /* contain large read-only data tables    */
1199                               /* that we'd rather not scan.             */
1200 #            endif
1201              extern int _end;
1202 #            define DATAEND (&_end)
1203 #       else
1204              extern int etext;
1205 #            define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
1206 #       endif
1207 #   endif
1208 #endif
1209
1210 #ifdef LINUX_DATA_START
1211     /* Some Linux distributions arrange to define __data_start.  Some   */
1212     /* define data_start as a weak symbol.  The latter is technically   */
1213     /* broken, since the user program may define data_start, in which   */
1214     /* case we lose.  Nonetheless, we try both, prefering __data_start. */
1215     /* We assume gcc.   */
1216 #   pragma weak __data_start
1217     extern int __data_start;
1218 #   pragma weak data_start
1219     extern int data_start;
1220 #   define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
1221 #endif
1222
1223 # ifndef STACK_GROWS_UP
1224 #   define STACK_GROWS_DOWN
1225 # endif
1226
1227 # ifndef CPP_WORDSZ
1228 #   define CPP_WORDSZ 32
1229 # endif
1230
1231 # ifndef OS_TYPE
1232 #   define OS_TYPE ""
1233 # endif
1234
1235 # ifndef DATAEND
1236     extern int end;
1237 #   define DATAEND (&end)
1238 # endif
1239
1240 # if defined(SVR4) && !defined(GETPAGESIZE)
1241 #    include <unistd.h>
1242 #    define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
1243 # endif
1244
1245 # ifndef GETPAGESIZE
1246 #   if defined(SUNOS5) || defined(IRIX5)
1247 #       include <unistd.h>
1248 #   endif
1249 #   define GETPAGESIZE() getpagesize()
1250 # endif
1251
1252 # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
1253     /* OS has SVR4 generic features.  Probably others also qualify.     */
1254 #   define SVR4
1255 # endif
1256
1257 # if defined(SUNOS5) || defined(DRSNX)
1258     /* OS has SUNOS5 style semi-undocumented interface to dynamic       */
1259     /* loader.                                                          */
1260 #   define SUNOS5DL
1261     /* OS has SUNOS5 style signal handlers.                             */
1262 #   define SUNOS5SIGS
1263 # endif
1264
1265 # if defined(HPUX)
1266 #   define SUNOS5SIGS
1267 # endif
1268
1269 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
1270    -> bad word size
1271 # endif
1272
1273 # ifdef PCR
1274 #   undef DYNAMIC_LOADING
1275 #   undef STACKBOTTOM
1276 #   undef HEURISTIC1
1277 #   undef HEURISTIC2
1278 #   undef PROC_VDB
1279 #   undef MPROTECT_VDB
1280 #   define PCR_VDB
1281 # endif
1282
1283 # ifdef SRC_M3
1284 /* Postponed for now. */
1285 #   undef PROC_VDB
1286 #   undef MPROTECT_VDB
1287 # endif
1288
1289 # ifdef SMALL_CONFIG
1290 /* Presumably not worth the space it takes. */
1291 #   undef PROC_VDB
1292 #   undef MPROTECT_VDB
1293 # endif
1294
1295 # ifdef USE_MUNMAP
1296 #   undef MPROTECT_VDB  /* Can't deal with address space holes. */
1297 # endif
1298
1299 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
1300 #   define DEFAULT_VDB
1301 # endif
1302
1303 # ifndef PREFETCH
1304 #   define PREFETCH(x)
1305 #   define NO_PREFETCH
1306 # endif
1307
1308 # ifndef PREFETCH_FOR_WRITE
1309 #   define PREFETCH_FOR_WRITE(x)
1310 #   define NO_PREFETCH_FOR_WRITE
1311 # endif
1312
1313 # ifndef CACHE_LINE_SIZE
1314 #   define CACHE_LINE_SIZE 32   /* Wild guess   */
1315 # endif
1316
1317 # ifndef CLEAR_DOUBLE
1318 #   define CLEAR_DOUBLE(x) \
1319         ((word*)x)[0] = 0; \
1320         ((word*)x)[1] = 0;
1321 # endif /* CLEAR_DOUBLE */
1322
1323 # if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
1324 #   define SOLARIS_THREADS
1325 # endif
1326 # if defined(IRIX_THREADS) && !defined(IRIX5)
1327 --> inconsistent configuration
1328 # endif
1329 # if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
1330 --> inconsistent configuration
1331 # endif
1332 # if defined(LINUX_THREADS) && !defined(LINUX)
1333 --> inconsistent configuration
1334 # endif
1335 # if defined(SOLARIS_THREADS) && !defined(SUNOS5)
1336 --> inconsistent configuration
1337 # endif
1338 # if defined(HPUX_THREADS) && !defined(HPUX)
1339 --> inconsistent configuration
1340 # endif
1341 # if defined(PCR) || defined(SRC_M3) || \
1342         defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
1343         defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
1344         defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
1345 #   define THREADS
1346 # endif
1347
1348 # if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
1349      || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
1350         /* Use setjmp based hack to mark from callee-save registers. */
1351 #       define USE_GENERIC_PUSH_REGS
1352 # endif
1353 # if defined(SPARC)
1354 #   define SAVE_CALL_CHAIN
1355 #   define ASM_CLEAR_CODE       /* Stack clearing is crucial, and we    */
1356                                 /* include assembly code to do it well. */
1357 # endif
1358
1359 # endif /* GCCONFIG_H */