boehm-gc/config.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 CONFIG_H
  17
  18 # define CONFIG_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 /* Determine the machine type: */
  26 # if defined(sun) && defined(mc68000)
  27 #    define M68K
  28 #    define SUNOS4
  29 #    define mach_type_known
  30 # endif
  31 # if defined(hp9000s300)
  32 #    define M68K
  33 #    define HP
  34 #    define mach_type_known
  35 # endif
  36 # if defined(__NetBSD__) && defined(m68k)
  37 #    define M68K
  38 #    define NETBSD
  39 #    define mach_type_known
  40 # endif
  41 # if defined(vax)
  42 #    define VAX
  43 #    ifdef ultrix
  44 #       define ULTRIX
  45 #    else
  46 #       define BSD
  47 #    endif
  48 #    define mach_type_known
  49 # endif
  50 # if defined(mips) || defined(__mips)
  51 #    define MIPS
  52 #    if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)
  53 #       define ULTRIX
  54 #    else
  55 #       if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4__)
  56 #         define IRIX5   /* or IRIX 6.X */
  57 #       else
  58 #         define RISCOS  /* or IRIX 4.X */
  59 #       endif
  60 #    endif
  61 #    define mach_type_known
  62 # endif
  63 # if defined(sequent) && defined(i386)
  64 #    define I386
  65 #    define SEQUENT
  66 #    define mach_type_known
  67 # endif
  68 # if defined(sun) && defined(i386)
  69 #    define I386
  70 #    define SUNOS5
  71 #    define mach_type_known
  72 # endif
  73 # if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
  74 #    define I386
  75 #    define OS2
  76 #    define mach_type_known
  77 # endif
  78 # if defined(ibm032)
  79 #   define RT
  80 #   define mach_type_known
  81 # endif
  82 # if defined(sun) && (defined(sparc) || defined(__sparc))
  83 #   define SPARC
  84     /* Test for SunOS 5.x */
  85 #     include <errno.h>
  86 #     ifdef ECHRNG
  87 #       define SUNOS5
  88 #     else
  89 #       define SUNOS4
  90 #     endif
  91 #   define mach_type_known
  92 # endif
  93 # if defined(sparc) && defined(unix) && !defined(sun)
  94 #   define SPARC
  95 #   define DRSNX
  96 #   define mach_type_known
  97 # endif
  98 # if defined(_IBMR2)
  99 #   define RS6000
 100 #   define mach_type_known
 101 # endif
 102 # if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
 103         /* The above test may need refinement   */
 104 #   define I386
 105 #   if defined(_SCO_ELF)
 106 #     define SCO_ELF
 107 #   else
 108 #     define SCO
 109 #   endif
 110 #   define mach_type_known
 111 # endif
 112 # if defined(_AUX_SOURCE)
 113 #   define M68K
 114 #   define SYSV
 115 #   define mach_type_known
 116 # endif
 117 # if defined(_PA_RISC1_0) || defined(_PA_RISC1_1)
 118 #   define HP_PA
 119 #   define mach_type_known
 120 # endif
 121 # if defined(linux) && defined(i386)
 122 #    define I386
 123 #    define LINUX
 124 #    define mach_type_known
 125 # endif
 126 # if defined(linux) && defined(powerpc)
 127 #    define POWERPC
 128 #    define LINUX
 129 #    define mach_type_known
 130 # endif
 131 # if defined(__alpha) || defined(__alpha__)
 132 #   define ALPHA
 133 #   if defined(linux) || defined(__linux__)
 134 #     define LINUX
 135 #   else
 136 #     define OSF1       /* a.k.a Digital Unix */
 137 #   endif
 138 #   define mach_type_known
 139 # endif
 140 # if defined(_AMIGA)
 141 #   define M68K
 142 #   define AMIGA
 143 #   define mach_type_known
 144 # endif
 145 # if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
 146 #   define M68K
 147 #   define MACOS
 148 #   define mach_type_known
 149 # endif
 150 # if defined(__MWERKS__) && defined(__powerc)
 151 #   define POWERPC
 152 #   define MACOS
 153 #   define mach_type_known
 154 # endif
 155 # if defined(NeXT) && defined(mc68000)
 156 #   define M68K
 157 #   define NEXT
 158 #   define mach_type_known
 159 # endif
 160 # if defined(NeXT) && defined(i386)
 161 #   define I386
 162 #   define NEXT
 163 #   define mach_type_known
 164 # endif
 165 # if defined(__FreeBSD__) && defined(i386)
 166 #   define I386
 167 #   define FREEBSD
 168 #   define mach_type_known
 169 # endif
 170 # if defined(__NetBSD__) && defined(i386)
 171 #   define I386
 172 #   define NETBSD
 173 #   define mach_type_known
 174 # endif
 175 # if defined(bsdi) && defined(i386)
 176 #    define I386
 177 #    define BSDI
 178 #    define mach_type_known
 179 # endif
 180 # if !defined(mach_type_known) && defined(__386BSD__)
 181 #   define I386
 182 #   define THREE86BSD
 183 #   define mach_type_known
 184 # endif
 185 # if defined(_CX_UX) && defined(_M88K)
 186 #   define M88K
 187 #   define CX_UX
 188 #   define mach_type_known
 189 # endif
 190 # if defined(DGUX)
 191 #   define M88K
 192     /* DGUX defined */
 193 #   define mach_type_known
 194 # endif
 195 # if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300)
 196 #   define I386
 197 #   define MSWIN32      /* or Win32s */
 198 #   define mach_type_known
 199 # endif
 200 # if defined(__DJGPP__)
 201 #   define I386
 202 #   ifndef DJGPP
 203 #     define DJGPP  /* MSDOS running the DJGPP port of GCC */
 204 #   endif
 205 #   define mach_type_known
 206 # endif
 207 # if defined(__CYGWIN32__)
 208 #   define I386
 209 #   define CYGWIN32
 210 #   define mach_type_known
 211 # endif
 212 # if defined(__BORLANDC__)
 213 #   define I386
 214 #   define MSWIN32
 215 #   define mach_type_known
 216 # endif
 217 # if defined(_UTS) && !defined(mach_type_known)
 218 #   define S370
 219 #   define UTS4
 220 #   define mach_type_known
 221 # endif
 222 /* Ivan Demakov */
 223 # if defined(__WATCOMC__) && defined(__386__)
 224 #   define I386
 225 #   if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
 226 #     if defined(__OS2__)
 227 #       define OS2
 228 #     else
 229 #       if defined(__WINDOWS_386__) || defined(__NT__)
 230 #         define MSWIN32
 231 #       else
 232 #         define DOS4GW
 233 #       endif
 234 #     endif
 235 #   endif
 236 #   define mach_type_known
 237 # endif
 238 # if defined(__pj__)
 239 #   define PJ
 240 #   define mach_type_known
 241 # endif
 242
 243 /* Feel free to add more clauses here */
 244
 245 /* Or manually define the machine type here.  A machine type is         */
 246 /* characterized by the architecture.  Some                             */
 247 /* machine types are further subdivided by OS.                          */
 248 /* the macros ULTRIX, RISCOS, and BSD to distinguish.                   */
 249 /* Note that SGI IRIX is treated identically to RISCOS.                 */
 250 /* SYSV on an M68K actually means A/UX.                                 */
 251 /* The distinction in these cases is usually the stack starting address */
 252 # ifndef mach_type_known
 253         --> unknown machine type
 254 # endif
 255                     /* Mapping is: M68K       ==> Motorola 680X0        */
 256                     /*             (SUNOS4,HP,NEXT, and SYSV (A/UX),    */
 257                     /*             MACOS and AMIGA variants)            */
 258                     /*             I386       ==> Intel 386             */
 259                     /*              (SEQUENT, OS2, SCO, LINUX, NETBSD,  */
 260                     /*               FREEBSD, THREE86BSD, MSWIN32,      */
 261                     /*               BSDI, SUNOS5, NEXT variants)       */
 262                     /*             NS32K      ==> Encore Multimax       */
 263                     /*             MIPS       ==> R2000 or R3000        */
 264                     /*                  (RISCOS, ULTRIX variants)       */
 265                     /*             VAX        ==> DEC VAX               */
 266                     /*                  (BSD, ULTRIX variants)          */
 267                     /*             RS6000     ==> IBM RS/6000 AIX3.X    */
 268                     /*             RT         ==> IBM PC/RT             */
 269                     /*             HP_PA      ==> HP9000/700 & /800     */
 270                     /*                            HP/UX                 */
 271                     /*             SPARC      ==> SPARC under SunOS     */
 272                     /*                  (SUNOS4, SUNOS5,                */
 273                     /*                   DRSNX variants)                */
 274                     /*             ALPHA      ==> DEC Alpha             */
 275                     /*                  (OSF1 and LINUX variants)       */
 276                     /*             M88K       ==> Motorola 88XX0        */
 277                     /*                  (CX_UX and DGUX)                */
 278                     /*             S370       ==> 370-like machine      */
 279                     /*                  running Amdahl UTS4             */
 280
 281
 282 /*
 283  * For each architecture and OS, the following need to be defined:
 284  *
 285  * CPP_WORD_SZ is a simple integer constant representing the word size.
 286  * in bits.  We assume byte addressibility, where a byte has 8 bits.
 287  * We also assume CPP_WORD_SZ is either 32 or 64.
 288  * (We care about the length of pointers, not hardware
 289  * bus widths.  Thus a 64 bit processor with a C compiler that uses
 290  * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
 291  *
 292  * MACH_TYPE is a string representation of the machine type.
 293  * OS_TYPE is analogous for the OS.
 294  *
 295  * ALIGNMENT is the largest N, such that
 296  * all pointer are guaranteed to be aligned on N byte boundaries.
 297  * defining it to be 1 will always work, but perform poorly.
 298  *
 299  * DATASTART is the beginning of the data segment.
 300  * On UNIX systems, the collector will scan the area between DATASTART
 301  * and DATAEND for root pointers.
 302  *
 303  * DATAEND, if not &end.
 304  *
 305  * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
 306  * the pointer size.
 307  *
 308  * STACKBOTTOM is the cool end of the stack, which is usually the
 309  * highest address in the stack.
 310  * Under PCR or OS/2, we have other ways of finding thread stacks.
 311  * For each machine, the following should:
 312  * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
 313  * 2) define exactly one of
 314  *      STACKBOTTOM (should be defined to be an expression)
 315  *      HEURISTIC1
 316  *      HEURISTIC2
 317  * If either of the last two macros are defined, then STACKBOTTOM is computed
 318  * during collector startup using one of the following two heuristics:
 319  * HEURISTIC1:  Take an address inside GC_init's frame, and round it up to
 320  *              the next multiple of STACK_GRAN.
 321  * HEURISTIC2:  Take an address inside GC_init's frame, increment it repeatedly
 322  *              in small steps (decrement if STACK_GROWS_UP), and read the value
 323  *              at each location.  Remember the value when the first
 324  *              Segmentation violation or Bus error is signalled.  Round that
 325  *              to the nearest plausible page boundary, and use that instead
 326  *              of STACKBOTTOM.
 327  *
 328  * If no expression for STACKBOTTOM can be found, and neither of the above
 329  * heuristics are usable, the collector can still be used with all of the above
 330  * undefined, provided one of the following is done:
 331  * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
 332  *    without reference to STACKBOTTOM.  This is appropriate for use in
 333  *    conjunction with thread packages, since there will be multiple stacks.
 334  *    (Allocating thread stacks in the heap, and treating them as ordinary
 335  *    heap data objects is also possible as a last resort.  However, this is
 336  *    likely to introduce significant amounts of excess storage retention
 337  *    unless the dead parts of the thread stacks are periodically cleared.)
 338  * 2) Client code may set GC_stackbottom before calling any GC_ routines.
 339  *    If the author of the client code controls the main program, this is
 340  *    easily accomplished by introducing a new main program, setting
 341  *    GC_stackbottom to the address of a local variable, and then calling
 342  *    the original main program.  The new main program would read something
 343  *    like:
 344  *
 345  *              # include "gc_private.h"
 346  *
 347  *              main(argc, argv, envp)
 348  *              int argc;
 349  *              char **argv, **envp;
 350  *              {
 351  *                  int dummy;
 352  *
 353  *                  GC_stackbottom = (ptr_t)(&dummy);
 354  *                  return(real_main(argc, argv, envp));
 355  *              }
 356  *
 357  *
 358  * Each architecture may also define the style of virtual dirty bit
 359  * implementation to be used:
 360  *   MPROTECT_VDB: Write protect the heap and catch faults.
 361  *   PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
 362  *
 363  * An architecture may define DYNAMIC_LOADING if dynamic_load.c
 364  * defined GC_register_dynamic_libraries() for the architecture.
 365  */
 366
 367
 368 # define STACK_GRAN 0x1000000
 369 # ifdef M68K
 370 #   define MACH_TYPE "M68K"
 371 #   define ALIGNMENT 2
 372 #   ifdef NETBSD
 373 #       define OS_TYPE "NETBSD"
 374 #       define HEURISTIC2
 375         extern char etext;
 376 #       define DATASTART ((ptr_t)(&etext))
 377 #   endif
 378 #   ifdef SUNOS4
 379 #       define OS_TYPE "SUNOS4"
 380         extern char etext;
 381 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
 382 #       define HEURISTIC1       /* differs      */
 383 #       define DYNAMIC_LOADING
 384 #   endif
 385 #   ifdef HP
 386 #       define OS_TYPE "HP"
 387         extern char etext;
 388 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 389 #       define STACKBOTTOM ((ptr_t) 0xffeffffc)
 390                               /* empirically determined.  seems to work. */
 391 #       include <unistd.h>
 392 #       define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
 393 #   endif
 394 #   ifdef SYSV
 395 #       define OS_TYPE "SYSV"
 396         extern etext;
 397 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
 398                                    & ~0x3fffff) \
 399                                   +((word)&etext & 0x1fff))
 400         /* This only works for shared-text binaries with magic number 0413.
 401            The other sorts of SysV binaries put the data at the end of the text,
 402            in which case the default of &etext would work.  Unfortunately,
 403            handling both would require having the magic-number available.
 404                                 -- Parag
 405            */
 406 #       define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
 407                         /* The stack starts at the top of memory, but   */
 408                         /* 0x0 cannot be used as setjump_test complains */
 409                         /* that the stack direction is incorrect.  Two  */
 410                         /* bytes down from 0x0 should be safe enough.   */
 411                         /*              --Parag                         */
 412 #       include <sys/mmu.h>
 413 #       define GETPAGESIZE() PAGESIZE   /* Is this still right? */
 414 #   endif
 415 #   ifdef AMIGA
 416 #       define OS_TYPE "AMIGA"
 417                 /* STACKBOTTOM and DATASTART handled specially  */
 418                 /* in os_dep.c                                  */
 419 #       define DATAEND  /* not needed */
 420 #       define GETPAGESIZE() 4096
 421 #   endif
 422 #   ifdef MACOS
 423 #     ifndef __LOWMEM__
 424 #     include <LowMem.h>
 425 #     endif
 426 #     define OS_TYPE "MACOS"
 427                         /* see os_dep.c for details of global data segments. */
 428 #     define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
 429 #     define DATAEND    /* not needed */
 430 #     define GETPAGESIZE() 4096
 431 #   endif
 432 #   ifdef NEXT
 433 #       define OS_TYPE "NEXT"
 434 #       define DATASTART ((ptr_t) get_etext())
 435 #       define STACKBOTTOM ((ptr_t) 0x4000000)
 436 #       define DATAEND  /* not needed */
 437 #   endif
 438 # endif
 439
 440 # ifdef POWERPC
 441 #   define MACH_TYPE "POWERPC"
 442 #   define ALIGNMENT 2
 443 #   ifdef MACOS
 444 #     ifndef __LOWMEM__
 445 #     include <LowMem.h>
 446 #     endif
 447 #     define OS_TYPE "MACOS"
 448                         /* see os_dep.c for details of global data segments. */
 449 #     define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
 450 #     define DATAEND  /* not needed */
 451 #   endif
 452 #   ifdef LINUX
 453 #     define OS_TYPE "LINUX"
 454 #     define STACKBOTTOM ((ptr_t)0x80000000)
 455 #     define DATASTART GC_data_start
 456       extern int _end;
 457 #     define DATAEND (&_end)
 458 #   endif
 459 # endif
 460
 461 # ifdef VAX
 462 #   define MACH_TYPE "VAX"
 463 #   define ALIGNMENT 4  /* Pointers are longword aligned by 4.2 C compiler */
 464     extern char etext;
 465 #   define DATASTART ((ptr_t)(&etext))
 466 #   ifdef BSD
 467 #       define OS_TYPE "BSD"
 468 #       define HEURISTIC1
 469                         /* HEURISTIC2 may be OK, but it's hard to test. */
 470 #   endif
 471 #   ifdef ULTRIX
 472 #       define OS_TYPE "ULTRIX"
 473 #       define STACKBOTTOM ((ptr_t) 0x7fffc800)
 474 #   endif
 475 # endif
 476
 477 # ifdef RT
 478 #   define MACH_TYPE "RT"
 479 #   define ALIGNMENT 4
 480 #   define DATASTART ((ptr_t) 0x10000000)
 481 #   define STACKBOTTOM ((ptr_t) 0x1fffd800)
 482 # endif
 483
 484 # ifdef SPARC
 485 #   define MACH_TYPE "SPARC"
 486 #   define ALIGNMENT 4  /* Required by hardware */
 487 #   define ALIGN_DOUBLE
 488     extern int etext;
 489 #   ifdef SUNOS5
 490 #       define OS_TYPE "SUNOS5"
 491         extern int _etext;
 492         extern int _end;
 493         extern char * GC_SysVGetDataStart();
 494 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
 495 #       define DATAEND (&_end)
 496 #       ifndef USE_MMAP
 497 #           define USE_MMAP
 498 #       endif
 499 #       ifdef USE_MMAP
 500 #         define HEAP_START (ptr_t)0x40000000
 501 #       else
 502 #         define HEAP_START DATAEND
 503 #       endif
 504 #       define PROC_VDB
 505 #       define HEURISTIC1
 506 #       include <unistd.h>
 507 #       define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
 508                 /* getpagesize() appeared to be missing from at least one */
 509                 /* Solaris 5.4 installation.  Weird.                      */
 510 #   endif
 511 #   ifdef SUNOS4
 512 #       define OS_TYPE "SUNOS4"
 513         /* [If you have a weak stomach, don't read this.]               */
 514         /* We would like to use:                                        */
 515 /* #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
 516         /* This fails occasionally, due to an ancient, but very         */
 517         /* persistent ld bug.  &etext is set 32 bytes too high.         */
 518         /* We instead read the text segment size from the a.out         */
 519         /* header, which happens to be mapped into our address space    */
 520         /* at the start of the text segment.  The detective work here   */
 521         /* was done by Robert Ehrlich, Manuel Serrano, and Bernard      */
 522         /* Serpette of INRIA.                                           */
 523         /* This assumes ZMAGIC, i.e. demand-loadable executables.       */
 524 #       define TEXTSTART 0x2000
 525 #       define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
 526 #       define MPROTECT_VDB
 527 #       define HEURISTIC1
 528 #   endif
 529 #   ifdef DRSNX
 530 #       define CPP_WORDSZ 32
 531 #       define OS_TYPE "DRSNX"
 532         extern char * GC_SysVGetDataStart();
 533         extern int etext;
 534 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
 535 #       define MPROTECT_VDB
 536 #       define STACKBOTTOM ((ptr_t) 0xdfff0000)
 537 #   endif
 538 #   define DYNAMIC_LOADING
 539 # endif
 540
 541 # ifdef I386
 542 #   define MACH_TYPE "I386"
 543 #   define ALIGNMENT 4  /* Appears to hold for all "32 bit" compilers   */
 544                         /* except Borland.  The -a4 option fixes        */
 545                         /* Borland.                                     */
 546                         /* Ivan Demakov: For Watcom the option is -zp4. */
 547 #   ifndef SMALL_CONFIG
 548 #     define ALIGN_DOUBLE /* Not strictly necessary, but may give speed   */
 549                           /* improvement on Pentiums.                     */
 550 #   endif
 551 #   ifdef SEQUENT
 552 #       define OS_TYPE "SEQUENT"
 553         extern int etext;
 554 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 555 #       define STACKBOTTOM ((ptr_t) 0x3ffff000)
 556 #   endif
 557 #   ifdef SUNOS5
 558 #       define OS_TYPE "SUNOS5"
 559         extern int etext, _start;
 560         extern char * GC_SysVGetDataStart();
 561 #       define DATASTART GC_SysVGetDataStart(0x1000, &etext)
 562 #       define STACKBOTTOM ((ptr_t)(&_start))
 563 /** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
 564 /*#     define PROC_VDB*/
 565 #       define DYNAMIC_LOADING
 566 #       ifndef USE_MMAP
 567 #           define USE_MMAP
 568 #       endif
 569 #       ifdef USE_MMAP
 570 #         define HEAP_START (ptr_t)0x40000000
 571 #       else
 572 #         define HEAP_START DATAEND
 573 #       endif
 574 #   endif
 575 #   ifdef SCO
 576 #       define OS_TYPE "SCO"
 577         extern int etext;
 578 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
 579                                   & ~0x3fffff) \
 580                                  +((word)&etext & 0xfff))
 581 #       define STACKBOTTOM ((ptr_t) 0x7ffffffc)
 582 #   endif
 583 #   ifdef SCO_ELF
 584 #       define OS_TYPE "SCO_ELF"
 585         extern int etext;
 586 #       define DATASTART ((ptr_t)(&etext))
 587 #       define STACKBOTTOM ((ptr_t) 0x08048000)
 588 #       define DYNAMIC_LOADING
 589 #       define ELF_CLASS ELFCLASS32
 590 #   endif
 591 #   ifdef LINUX
 592 #       define OS_TYPE "LINUX"
 593 #       define STACKBOTTOM ((ptr_t)0xc0000000)
 594         /* Appears to be 0xe0000000 for at least one 2.1.91 kernel.     */
 595         /* Probably needs to be more flexible, but I don't yet          */
 596         /* fully understand how flexible.                               */
 597
 598         /* Linux threads don't interact well with the read() wrapper.
 599            Not defining MPROTECT_VDB fixes this.  */
 600         /* #    define MPROTECT_VDB*/
 601 #       ifdef __ELF__
 602 #            define DYNAMIC_LOADING
 603 #            ifdef UNDEFINED    /* includes ro data */
 604                extern int _etext;
 605 #              define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
 606 #            endif
 607 #            include <linux/version.h>
 608 #            include <features.h>
 609 #            if LINUX_VERSION_CODE >= 0x20000 && defined(__GLIBC__) && __GLIBC__ >= 2
 610                  extern int __data_start;
 611 #                define DATASTART ((ptr_t)(&__data_start))
 612 #            else
 613                  extern char **__environ;
 614 #                define DATASTART ((ptr_t)(&__environ))
 615                               /* hideous kludge: __environ is the first */
 616                               /* word in crt0.o, and delimits the start */
 617                               /* of the data segment, no matter which   */
 618                               /* ld options were passed through.        */
 619                               /* We could use _etext instead, but that  */
 620                               /* would include .rodata, which may       */
 621                               /* contain large read-only data tables    */
 622                               /* that we'd rather not scan.             */
 623 #            endif
 624              extern int _end;
 625 #            define DATAEND (&_end)
 626 #       else
 627              extern int etext;
 628 #            define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 629 #       endif
 630 #   endif
 631 #   ifdef CYGWIN32
 632           extern int _data_start__;
 633           extern int _data_end__;
 634           extern int _bss_start__;
 635           extern int _bss_end__;
 636         /* For binutils 2.9.1, we have                  */
 637         /*      DATASTART   = _data_start__             */
 638         /*      DATAEND     = _bss_end__                */
 639         /* whereas for some earlier versions it was     */
 640         /*      DATASTART   = _bss_start__              */
 641         /*      DATAEND     = _data_end__               */
 642         /* To get it right for both, we take the        */
 643         /* minumum/maximum of the two.                  */
 644 #       define MAX(x,y) ((x) > (y) ? (x) : (y))
 645 #       define MIN(x,y) ((x) < (y) ? (x) : (y))
 646 #       define DATASTART ((ptr_t) MIN(_data_start__, _bss_start__))
 647 #       define DATAEND   ((ptr_t) MAX(_data_end__, _bss_end__))
 648 #       undef STACK_GRAN
 649 #       define STACK_GRAN 0x10000
 650 #       define HEURISTIC1
 651 #   endif
 652 #   ifdef OS2
 653 #       define OS_TYPE "OS2"
 654                 /* STACKBOTTOM and DATASTART are handled specially in   */
 655                 /* os_dep.c. OS2 actually has the right                 */
 656                 /* system call!                                         */
 657 #       define DATAEND  /* not needed */
 658 #   endif
 659 #   ifdef MSWIN32
 660 #       define OS_TYPE "MSWIN32"
 661                 /* STACKBOTTOM and DATASTART are handled specially in   */
 662                 /* os_dep.c.                                            */
 663 #       ifndef __WATCOMC__
 664 #         define MPROTECT_VDB
 665 #       endif
 666 #       define DATAEND  /* not needed */
 667 #   endif
 668 #   ifdef DJGPP
 669 #       define OS_TYPE "DJGPP"
 670 #       include "stubinfo.h"
 671         extern int etext;
 672         extern int _stklen;
 673 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
 674 #       define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
 675                                                      + _stklen))
 676                 /* This may not be right.  */
 677 #   endif
 678 #   ifdef FREEBSD
 679 #       define OS_TYPE "FREEBSD"
 680 #       define MPROTECT_VDB
 681 #   endif
 682 #   ifdef NETBSD
 683 #       define OS_TYPE "NETBSD"
 684 #   endif
 685 #   ifdef THREE86BSD
 686 #       define OS_TYPE "THREE86BSD"
 687 #   endif
 688 #   ifdef BSDI
 689 #       define OS_TYPE "BSDI"
 690 #   endif
 691 #   if defined(FREEBSD) || defined(NETBSD) \
 692         || defined(THREE86BSD) || defined(BSDI)
 693 #       define HEURISTIC2
 694         extern char etext;
 695 #       define DATASTART ((ptr_t)(&etext))
 696 #   endif
 697 #   ifdef NEXT
 698 #       define OS_TYPE "NEXT"
 699 #       define DATASTART ((ptr_t) get_etext())
 700 #       define STACKBOTTOM ((ptr_t)0xc0000000)
 701 #       define DATAEND  /* not needed */
 702 #   endif
 703 #   ifdef DOS4GW
 704 #     define OS_TYPE "DOS4GW"
 705       /* Get_DATASTART, Get_DATAEND, Get_STACKBOTTOM
 706        *      Defined in gc-watcom.asm
 707        */
 708       extern char* Get_DATASTART (void);
 709       extern char* Get_DATAEND (void);
 710       extern char* Get_STACKBOTTOM (void);
 711 #     pragma aux Get_DATASTART "*" value [eax];
 712 #     pragma aux Get_DATAEND "*" value [eax];
 713 #     pragma aux Get_STACKBOTTOM "*" value [eax];
 714 #     define DATASTART ((ptr_t) Get_DATASTART())
 715 #     define STACKBOTTOM ((ptr_t) Get_STACKBOTTOM())
 716 #     define DATAEND ((ptr_t) Get_DATAEND())
 717 #   endif
 718 # endif
 719
 720 # ifdef NS32K
 721 #   define MACH_TYPE "NS32K"
 722 #   define ALIGNMENT 4
 723     extern char **environ;
 724 #   define DATASTART ((ptr_t)(&environ))
 725                               /* hideous kludge: environ is the first   */
 726                               /* word in crt0.o, and delimits the start */
 727                               /* of the data segment, no matter which   */
 728                               /* ld options were passed through.        */
 729 #   define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
 730 # endif
 731
 732 # ifdef MIPS
 733 # ifndef ECOS
 734 #   define MACH_TYPE "MIPS"
 735         /* CYGNUS LOCAL: respect predefined DATASTART_IS_ETEXT.  */
 736 #   ifdef DATASTART_IS_ETEXT
 737         extern int _etext;
 738 #     define DATASTART ((ptr_t)(&_etext))
 739 #   else
 740 #     ifndef IRIX5
 741 #       define DATASTART (ptr_t)0x10000000
 742                               /* Could probably be slightly higher since */
 743                               /* startup code allocates lots of stuff.   */
 744 #     else
 745         extern int _fdata;
 746 #       define DATASTART ((ptr_t)(&_fdata))
 747 #       ifdef USE_MMAP
 748 #           define HEAP_START (ptr_t)0x30000000
 749 #       else
 750 #           define HEAP_START DATASTART
 751 #       endif
 752                               /* Lowest plausible heap address.         */
 753                               /* In the MMAP case, we map there.        */
 754                               /* In either case it is used to identify  */
 755                               /* heap sections so they're not           */
 756                               /* considered as roots.                   */
 757 #     endif /* IRIX5 */
 758 #   endif /* DATASTART_IS_ETEXT */
 759 #   define HEURISTIC2
 760 /* #   define STACKBOTTOM ((ptr_t)0x7fff8000)  sometimes also works.  */
 761 #   ifdef ULTRIX
 762 #       define OS_TYPE "ULTRIX"
 763 #       define ALIGNMENT 4
 764 #   endif
 765 #   ifdef RISCOS
 766 #       define OS_TYPE "RISCOS"
 767 #       define ALIGNMENT 4  /* Required by hardware */
 768 #   endif
 769 #   ifdef IRIX5
 770 #       define OS_TYPE "IRIX5"
 771 #       define MPROTECT_VDB
 772 #       ifdef _MIPS_SZPTR
 773 #         define CPP_WORDSZ _MIPS_SZPTR
 774 #         define ALIGNMENT (_MIPS_SZPTR/8)
 775 #         if CPP_WORDSZ != 64
 776 #           define ALIGN_DOUBLE
 777 #         endif
 778 #       else
 779 #         define ALIGNMENT 4
 780 #         define ALIGN_DOUBLE
 781 #       endif
 782 #       define DYNAMIC_LOADING
 783 #   endif
 784 #   endif /* ECOS */
 785 # ifdef ECOS
 786     extern char __ram_data_start;
 787     extern char __ram_data_end;
 788 #   define MACH_TYPE "MIPS"
 789 #   define DATASTART (ptr_t)(&__ram_data_start)
 790 #   define DATAEND (ptr_t)(&__ram_data_end)
 791
 792 #   define HEURISTIC2
 793 #   define ALIGNMENT 4
 794 #   define ALIGN_DOUBLE
 795 #   endif /* ECOS */
 796 # endif
 797
 798 # ifdef RS6000
 799 #   define MACH_TYPE "RS6000"
 800 #   define ALIGNMENT 4
 801 #   define DATASTART ((ptr_t)0x20000000)
 802     extern int errno;
 803 #   define STACKBOTTOM ((ptr_t)((ulong)&errno))
 804 #   define DYNAMIC_LOADING
 805         /* For really old versions of AIX, this may have to be removed. */
 806 # endif
 807
 808 # ifdef HP_PA
 809 #   define MACH_TYPE "HP_PA"
 810 #   define ALIGNMENT 4
 811 #   define ALIGN_DOUBLE
 812     extern int __data_start;
 813 #   define DATASTART ((ptr_t)(&__data_start))
 814 #   if 0
 815         /* The following appears to work for 7xx systems running HP/UX  */
 816         /* 9.xx Furthermore, it might result in much faster             */
 817         /* collections than HEURISTIC2, which may involve scanning      */
 818         /* segments that directly precede the stack.  It is not the     */
 819         /* default, since it may not work on older machine/OS           */
 820         /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
 821         /* this.)                                                       */
 822 #       define STACKBOTTOM ((ptr_t) 0x7b033000)  /* from /etc/conf/h/param.h */
 823 #   else
 824 #       define HEURISTIC2
 825 #   endif
 826 #   define STACK_GROWS_UP
 827 #   define DYNAMIC_LOADING
 828 #   include <unistd.h>
 829 #   define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
 830         /* They misspelled the Posix macro?     */
 831 # endif
 832
 833 # ifdef ALPHA
 834 #   define MACH_TYPE "ALPHA"
 835 #   define ALIGNMENT 8
 836 #   ifdef OSF1
 837 #       define OS_TYPE "OSF1"
 838 #       define DATASTART ((ptr_t) 0x140000000)
 839 #       define HEURISTIC2
 840         /* Normally HEURISTIC2 is too conervative, since                */
 841         /* the text segment immediately follows the stack.              */
 842         /* Hence we give an upper pound.                                */
 843         extern int __start;
 844 #       define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
 845 #       define CPP_WORDSZ 64
 846 #       define MPROTECT_VDB
 847 #       define DYNAMIC_LOADING
 848 #   endif
 849 #   ifdef LINUX
 850 #       define OS_TYPE "LINUX"
 851 #       define CPP_WORDSZ 64
 852 #       define STACKBOTTOM ((ptr_t) 0x120000000)
 853 #       ifdef __ELF__
 854 #           define DATASTART GC_data_start
 855 #           define USE_PROC
 856 #           define DYNAMIC_LOADING
 857 #       else
 858 #           define DATASTART ((ptr_t) 0x140000000)
 859 #       endif
 860         extern int _end;
 861 #       define DATAEND (&_end)
 862         /* As of 1.3.90, I couldn't find a way to retrieve the correct  */
 863         /* fault address from a signal handler.                         */
 864         /* Hence MPROTECT_VDB is broken.                                */
 865 #   endif
 866 # endif
 867
 868 # ifdef M88K
 869 #   define MACH_TYPE "M88K"
 870 #   define ALIGNMENT 4
 871 #   define ALIGN_DOUBLE
 872     extern int etext;
 873 #   ifdef CX_UX
 874 #       define OS_TYPE "CX_UX"
 875 #       define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
 876 #   endif
 877 #   ifdef  DGUX
 878 #       define OS_TYPE "DGUX"
 879         extern char * GC_SysVGetDataStart();
 880 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
 881 #   endif
 882 #   define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
 883 # endif
 884
 885 # ifdef S370
 886 #   define MACH_TYPE "S370"
 887 #   define OS_TYPE "UTS4"
 888 #   define ALIGNMENT 4  /* Required by hardware */
 889     extern int etext;
 890         extern int _etext;
 891         extern int _end;
 892         extern char * GC_SysVGetDataStart();
 893 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
 894 #       define DATAEND (&_end)
 895 #       define HEURISTIC2
 896 # endif
 897
 898 # ifndef STACK_GROWS_UP
 899 #   define STACK_GROWS_DOWN
 900 # endif
 901
 902 # ifndef CPP_WORDSZ
 903 #   define CPP_WORDSZ 32
 904 # endif
 905
 906 # ifndef OS_TYPE
 907 #   define OS_TYPE ""
 908 # endif
 909
 910 # ifndef DATAEND
 911     extern int end;
 912 #   define DATAEND (&end)
 913 # endif
 914
 915 # if defined(SVR4) && !defined(GETPAGESIZE)
 916 #    include <unistd.h>
 917 #    define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
 918 # endif
 919
 920 # ifndef GETPAGESIZE
 921 #   if defined(SUNOS5) || defined(IRIX5)
 922 #       include <unistd.h>
 923 #   endif
 924 #   define GETPAGESIZE() getpagesize()
 925 # endif
 926
 927 # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
 928     /* OS has SVR4 generic features.  Probably others also qualify.     */
 929 #   define SVR4
 930 # endif
 931
 932 # if defined(SUNOS5) || defined(DRSNX)
 933     /* OS has SUNOS5 style semi-undocumented interface to dynamic       */
 934     /* loader.                                                          */
 935 #   define SUNOS5DL
 936     /* OS has SUNOS5 style signal handlers.                             */
 937 #   define SUNOS5SIGS
 938 # endif
 939
 940 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
 941    -> bad word size
 942 # endif
 943
 944 # ifdef PCR
 945 #   undef DYNAMIC_LOADING
 946 #   undef STACKBOTTOM
 947 #   undef HEURISTIC1
 948 #   undef HEURISTIC2
 949 #   undef PROC_VDB
 950 #   undef MPROTECT_VDB
 951 #   define PCR_VDB
 952 # endif
 953
 954 # ifdef SRC_M3
 955 /* Postponed for now. */
 956 #   undef PROC_VDB
 957 #   undef MPROTECT_VDB
 958 # endif
 959
 960 # ifdef SMALL_CONFIG
 961 /* Presumably not worth the space it takes. */
 962 #   undef PROC_VDB
 963 #   undef MPROTECT_VDB
 964 # endif
 965
 966 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
 967 #   define DEFAULT_VDB
 968 # endif
 969
 970 # if defined(IRIX_THREADS) && !defined(IRIX5)
 971 --> inconsistent configuration
 972 # endif
 973 # if defined(LINUX_THREADS) && !defined(LINUX)
 974 --> inconsistent configuration
 975 # endif
 976 # if defined(SOLARIS_THREADS) && !defined(SUNOS5)
 977 --> inconsistent configuration
 978 # endif
 979 # if defined(PCR) || defined(SRC_M3) || \
 980         defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
 981         defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
 982         defined(QUICK_THREADS)
 983 #   define THREADS
 984 # endif
 985
 986 # if defined(SPARC)
 987 #   define SAVE_CALL_CHAIN
 988 #   define ASM_CLEAR_CODE       /* Stack clearing is crucial, and we    */
 989                                 /* include assembly code to do it well. */
 990 # endif
 991
 992 # if defined(PJ)
 993 #   define ALIGNMENT 4
 994     extern int _etext;
 995 #   define DATASTART ((ptr_t)(&_etext))
 996 #   define HEURISTIC1
 997 # endif
 998
 999 # endif