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 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 /* 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(__NetBSD__) && defined(m68k)
  47 #    define M68K
  48 #    define NETBSD
  49 #    define mach_type_known
  50 # endif
  51 # if defined(vax)
  52 #    define VAX
  53 #    ifdef ultrix
  54 #       define ULTRIX
  55 #    else
  56 #       define BSD
  57 #    endif
  58 #    define mach_type_known
  59 # endif
  60 # if defined(mips) || defined(__mips)
  61 #    define MIPS
  62 #    if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)
  63 #       define ULTRIX
  64 #    else
  65 #       if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4__)
  66 #         define IRIX5   /* or IRIX 6.X */
  67 #       else
  68 #         define RISCOS  /* or IRIX 4.X */
  69 #       endif
  70 #    endif
  71 #    define mach_type_known
  72 # endif
  73 # if defined(sequent) && defined(i386)
  74 #    define I386
  75 #    define SEQUENT
  76 #    define mach_type_known
  77 # endif
  78 # if defined(sun) && defined(i386)
  79 #    define I386
  80 #    define SUNOS5
  81 #    define mach_type_known
  82 # endif
  83 # if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
  84 #    define I386
  85 #    define OS2
  86 #    define mach_type_known
  87 # endif
  88 # if defined(ibm032)
  89 #   define RT
  90 #   define mach_type_known
  91 # endif
  92 # if defined(sun) && (defined(sparc) || defined(__sparc))
  93 #   define SPARC
  94     /* Test for SunOS 5.x */
  95 #     include <errno.h>
  96 #     ifdef ECHRNG
  97 #       define SUNOS5
  98 #     else
  99 #       define SUNOS4
 100 #     endif
 101 #   define mach_type_known
 102 # endif
 103 # if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux)
 104 #   define SPARC
 105 #   define DRSNX
 106 #   define mach_type_known
 107 # endif
 108 # if defined(_IBMR2)
 109 #   define RS6000
 110 #   define mach_type_known
 111 # endif
 112 # if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
 113         /* The above test may need refinement   */
 114 #   define I386
 115 #   if defined(_SCO_ELF)
 116 #     define SCO_ELF
 117 #   else
 118 #     define SCO
 119 #   endif
 120 #   define mach_type_known
 121 # endif
 122 # if defined(_AUX_SOURCE)
 123 #   define M68K
 124 #   define SYSV
 125 #   define mach_type_known
 126 # endif
 127 # if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) \
 128      || defined(hppa) || defined(__hppa__)
 129 #   define HP_PA
 130 #   define mach_type_known
 131 # endif
 132 # if defined(LINUX) && defined(i386)
 133 #    define I386
 134 #    define mach_type_known
 135 # endif
 136 # if defined(LINUX) && defined(powerpc)
 137 #    define POWERPC
 138 #    define mach_type_known
 139 # endif
 140 # if defined(LINUX) && defined(__mc68000__)
 141 #    define M68K
 142 #    define mach_type_known
 143 # endif
 144 # if defined(linux) && defined(sparc)
 145 #    define SPARC
 146 #    define LINUX
 147 #    define mach_type_known
 148 # endif
 149 # if defined(__alpha) || defined(__alpha__)
 150 #   define ALPHA
 151 #   if !defined(LINUX)
 152 #     define OSF1       /* a.k.a Digital Unix */
 153 #   endif
 154 #   define mach_type_known
 155 # endif
 156 # if defined(_AMIGA)
 157 #   define M68K
 158 #   define AMIGA
 159 #   define mach_type_known
 160 # endif
 161 # if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
 162 #   define M68K
 163 #   define MACOS
 164 #   define mach_type_known
 165 # endif
 166 # if defined(__MWERKS__) && defined(__powerc)
 167 #   define POWERPC
 168 #   define MACOS
 169 #   define mach_type_known
 170 # endif
 171 # if defined(NeXT) && defined(mc68000)
 172 #   define M68K
 173 #   define NEXT
 174 #   define mach_type_known
 175 # endif
 176 # if defined(NeXT) && defined(i386)
 177 #   define I386
 178 #   define NEXT
 179 #   define mach_type_known
 180 # endif
 181 # if defined(__OpenBSD__) && defined(i386)
 182 #   define I386
 183 #   define OPENBSD
 184 #   define mach_type_known
 185 # endif
 186 # if defined(__FreeBSD__) && defined(i386)
 187 #   define I386
 188 #   define FREEBSD
 189 #   define mach_type_known
 190 # endif
 191 # if defined(__NetBSD__) && defined(i386)
 192 #   define I386
 193 #   define NETBSD
 194 #   define mach_type_known
 195 # endif
 196 # if defined(bsdi) && defined(i386)
 197 #    define I386
 198 #    define BSDI
 199 #    define mach_type_known
 200 # endif
 201 # if !defined(mach_type_known) && defined(__386BSD__)
 202 #   define I386
 203 #   define THREE86BSD
 204 #   define mach_type_known
 205 # endif
 206 # if defined(_CX_UX) && defined(_M88K)
 207 #   define M88K
 208 #   define CX_UX
 209 #   define mach_type_known
 210 # endif
 211 # if defined(DGUX)
 212 #   define M88K
 213     /* DGUX defined */
 214 #   define mach_type_known
 215 # endif
 216 # if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
 217      || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
 218 #   define I386
 219 #   define MSWIN32      /* or Win32s */
 220 #   define mach_type_known
 221 # endif
 222 # if defined(__DJGPP__)
 223 #   define I386
 224 #   ifndef DJGPP
 225 #     define DJGPP  /* MSDOS running the DJGPP port of GCC */
 226 #   endif
 227 #   define mach_type_known
 228 # endif
 229 # if defined(__CYGWIN32__) || defined(__CYGWIN__)
 230 #   define I386
 231 #   define CYGWIN32
 232 #   define mach_type_known
 233 # endif
 234 # if defined(__BORLANDC__)
 235 #   define I386
 236 #   define MSWIN32
 237 #   define mach_type_known
 238 # endif
 239 # if defined(_UTS) && !defined(mach_type_known)
 240 #   define S370
 241 #   define UTS4
 242 #   define mach_type_known
 243 # endif
 244 /* Ivan Demakov */
 245 # if defined(__WATCOMC__) && defined(__386__)
 246 #   define I386
 247 #   if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
 248 #     if defined(__OS2__)
 249 #       define OS2
 250 #     else
 251 #       if defined(__WINDOWS_386__) || defined(__NT__)
 252 #         define MSWIN32
 253 #       else
 254 #         define DOS4GW
 255 #       endif
 256 #     endif
 257 #   endif
 258 #   define mach_type_known
 259 # endif
 260
 261 /* Feel free to add more clauses here */
 262
 263 /* Or manually define the machine type here.  A machine type is         */
 264 /* characterized by the architecture.  Some                             */
 265 /* machine types are further subdivided by OS.                          */
 266 /* the macros ULTRIX, RISCOS, and BSD to distinguish.                   */
 267 /* Note that SGI IRIX is treated identically to RISCOS.                 */
 268 /* SYSV on an M68K actually means A/UX.                                 */
 269 /* The distinction in these cases is usually the stack starting address */
 270 # ifndef mach_type_known
 271         --> unknown machine type
 272 # endif
 273                     /* Mapping is: M68K       ==> Motorola 680X0        */
 274                     /*             (SUNOS4,HP,NEXT, and SYSV (A/UX),    */
 275                     /*             MACOS and AMIGA variants)            */
 276                     /*             I386       ==> Intel 386             */
 277                     /*              (SEQUENT, OS2, SCO, LINUX, NETBSD,  */
 278                     /*               FREEBSD, THREE86BSD, MSWIN32,      */
 279                     /*               BSDI,SUNOS5, NEXT, other variants) */
 280                     /*             NS32K      ==> Encore Multimax       */
 281                     /*             MIPS       ==> R2000 or R3000        */
 282                     /*                  (RISCOS, ULTRIX variants)       */
 283                     /*             VAX        ==> DEC VAX               */
 284                     /*                  (BSD, ULTRIX variants)          */
 285                     /*             RS6000     ==> IBM RS/6000 AIX3.X    */
 286                     /*             RT         ==> IBM PC/RT             */
 287                     /*             HP_PA      ==> HP9000/700 & /800     */
 288                     /*                            HP/UX                 */
 289                     /*             SPARC      ==> SPARC under SunOS     */
 290                     /*                  (SUNOS4, SUNOS5,                */
 291                     /*                   DRSNX variants)                */
 292                     /*             ALPHA      ==> DEC Alpha             */
 293                     /*                  (OSF1 and LINUX variants)       */
 294                     /*             M88K       ==> Motorola 88XX0        */
 295                     /*                  (CX_UX and DGUX)                */
 296                     /*             S370       ==> 370-like machine      */
 297                     /*                  running Amdahl UTS4             */
 298
 299
 300 /*
 301  * For each architecture and OS, the following need to be defined:
 302  *
 303  * CPP_WORD_SZ is a simple integer constant representing the word size.
 304  * in bits.  We assume byte addressibility, where a byte has 8 bits.
 305  * We also assume CPP_WORD_SZ is either 32 or 64.
 306  * (We care about the length of pointers, not hardware
 307  * bus widths.  Thus a 64 bit processor with a C compiler that uses
 308  * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
 309  *
 310  * MACH_TYPE is a string representation of the machine type.
 311  * OS_TYPE is analogous for the OS.
 312  *
 313  * ALIGNMENT is the largest N, such that
 314  * all pointer are guaranteed to be aligned on N byte boundaries.
 315  * defining it to be 1 will always work, but perform poorly.
 316  *
 317  * DATASTART is the beginning of the data segment.
 318  * On UNIX systems, the collector will scan the area between DATASTART
 319  * and DATAEND for root pointers.
 320  *
 321  * DATAEND, if not &end.
 322  *
 323  * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
 324  * the pointer size.
 325  *
 326  * STACKBOTTOM is the cool end of the stack, which is usually the
 327  * highest address in the stack.
 328  * Under PCR or OS/2, we have other ways of finding thread stacks.
 329  * For each machine, the following should:
 330  * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
 331  * 2) define exactly one of
 332  *      STACKBOTTOM (should be defined to be an expression)
 333  *      HEURISTIC1
 334  *      HEURISTIC2
 335  * If either of the last two macros are defined, then STACKBOTTOM is computed
 336  * during collector startup using one of the following two heuristics:
 337  * HEURISTIC1:  Take an address inside GC_init's frame, and round it up to
 338  *              the next multiple of STACK_GRAN.
 339  * HEURISTIC2:  Take an address inside GC_init's frame, increment it repeatedly
 340  *              in small steps (decrement if STACK_GROWS_UP), and read the value
 341  *              at each location.  Remember the value when the first
 342  *              Segmentation violation or Bus error is signalled.  Round that
 343  *              to the nearest plausible page boundary, and use that instead
 344  *              of STACKBOTTOM.
 345  *
 346  * If no expression for STACKBOTTOM can be found, and neither of the above
 347  * heuristics are usable, the collector can still be used with all of the above
 348  * undefined, provided one of the following is done:
 349  * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
 350  *    without reference to STACKBOTTOM.  This is appropriate for use in
 351  *    conjunction with thread packages, since there will be multiple stacks.
 352  *    (Allocating thread stacks in the heap, and treating them as ordinary
 353  *    heap data objects is also possible as a last resort.  However, this is
 354  *    likely to introduce significant amounts of excess storage retention
 355  *    unless the dead parts of the thread stacks are periodically cleared.)
 356  * 2) Client code may set GC_stackbottom before calling any GC_ routines.
 357  *    If the author of the client code controls the main program, this is
 358  *    easily accomplished by introducing a new main program, setting
 359  *    GC_stackbottom to the address of a local variable, and then calling
 360  *    the original main program.  The new main program would read something
 361  *    like:
 362  *
 363  *              # include "gc_private.h"
 364  *
 365  *              main(argc, argv, envp)
 366  *              int argc;
 367  *              char **argv, **envp;
 368  *              {
 369  *                  int dummy;
 370  *
 371  *                  GC_stackbottom = (ptr_t)(&dummy);
 372  *                  return(real_main(argc, argv, envp));
 373  *              }
 374  *
 375  *
 376  * Each architecture may also define the style of virtual dirty bit
 377  * implementation to be used:
 378  *   MPROTECT_VDB: Write protect the heap and catch faults.
 379  *   PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
 380  *
 381  * An architecture may define DYNAMIC_LOADING if dynamic_load.c
 382  * defined GC_register_dynamic_libraries() for the architecture.
 383  */
 384
 385
 386 # define STACK_GRAN 0x1000000
 387 # ifdef M68K
 388 #   define MACH_TYPE "M68K"
 389 #   define ALIGNMENT 2
 390 #   ifdef OPENBSD
 391 #       define OS_TYPE "OPENBSD"
 392 #       define HEURISTIC2
 393         extern char etext;
 394 #       define DATASTART ((ptr_t)(&etext))
 395 #   endif
 396 #   ifdef NETBSD
 397 #       define OS_TYPE "NETBSD"
 398 #       define HEURISTIC2
 399         extern char etext;
 400 #       define DATASTART ((ptr_t)(&etext))
 401 #   endif
 402 #   ifdef LINUX
 403 #       define OS_TYPE "LINUX"
 404 #       define STACKBOTTOM ((ptr_t)0xf0000000)
 405 #       define MPROTECT_VDB
 406 #       ifdef __ELF__
 407 #            define DYNAMIC_LOADING
 408              extern char **__environ;
 409 #            define DATASTART ((ptr_t)(&__environ))
 410                              /* hideous kludge: __environ is the first */
 411                              /* word in crt0.o, and delimits the start */
 412                              /* of the data segment, no matter which   */
 413                              /* ld options were passed through.        */
 414                              /* We could use _etext instead, but that  */
 415                              /* would include .rodata, which may       */
 416                              /* contain large read-only data tables    */
 417                              /* that we'd rather not scan.             */
 418              extern int _end;
 419 #            define DATAEND (&_end)
 420 #       else
 421              extern int etext;
 422 #            define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 423 #       endif
 424 #   endif
 425 #   ifdef SUNOS4
 426 #       define OS_TYPE "SUNOS4"
 427         extern char etext;
 428 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
 429 #       define HEURISTIC1       /* differs      */
 430 #       define DYNAMIC_LOADING
 431 #   endif
 432 #   ifdef HP
 433 #       define OS_TYPE "HP"
 434         extern char etext;
 435 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 436 #       define STACKBOTTOM ((ptr_t) 0xffeffffc)
 437                               /* empirically determined.  seems to work. */
 438 #       include <unistd.h>
 439 #       define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
 440 #   endif
 441 #   ifdef SYSV
 442 #       define OS_TYPE "SYSV"
 443         extern etext;
 444 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
 445                                    & ~0x3fffff) \
 446                                   +((word)&etext & 0x1fff))
 447         /* This only works for shared-text binaries with magic number 0413.
 448            The other sorts of SysV binaries put the data at the end of the text,
 449            in which case the default of &etext would work.  Unfortunately,
 450            handling both would require having the magic-number available.
 451                                 -- Parag
 452            */
 453 #       define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
 454                         /* The stack starts at the top of memory, but   */
 455                         /* 0x0 cannot be used as setjump_test complains */
 456                         /* that the stack direction is incorrect.  Two  */
 457                         /* bytes down from 0x0 should be safe enough.   */
 458                         /*              --Parag                         */
 459 #       include <sys/mmu.h>
 460 #       define GETPAGESIZE() PAGESIZE   /* Is this still right? */
 461 #   endif
 462 #   ifdef AMIGA
 463 #       define OS_TYPE "AMIGA"
 464                 /* STACKBOTTOM and DATASTART handled specially  */
 465                 /* in os_dep.c                                  */
 466 #       define DATAEND  /* not needed */
 467 #       define GETPAGESIZE() 4096
 468 #   endif
 469 #   ifdef MACOS
 470 #     ifndef __LOWMEM__
 471 #     include <LowMem.h>
 472 #     endif
 473 #     define OS_TYPE "MACOS"
 474                         /* see os_dep.c for details of global data segments. */
 475 #     define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
 476 #     define DATAEND    /* not needed */
 477 #     define GETPAGESIZE() 4096
 478 #   endif
 479 #   ifdef NEXT
 480 #       define OS_TYPE "NEXT"
 481 #       define DATASTART ((ptr_t) get_etext())
 482 #       define STACKBOTTOM ((ptr_t) 0x4000000)
 483 #       define DATAEND  /* not needed */
 484 #   endif
 485 # endif
 486
 487 # ifdef POWERPC
 488 #   define MACH_TYPE "POWERPC"
 489 #   define ALIGNMENT 2
 490 #   ifdef MACOS
 491 #     ifndef __LOWMEM__
 492 #     include <LowMem.h>
 493 #     endif
 494 #     define OS_TYPE "MACOS"
 495                         /* see os_dep.c for details of global data segments. */
 496 #     define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
 497 #     define DATAEND  /* not needed */
 498 #   endif
 499 #   ifdef LINUX
 500 #     define OS_TYPE "LINUX"
 501 #     define HEURISTIC1
 502 #     undef STACK_GRAN
 503 #     define STACK_GRAN 0x10000000
 504 #     define DATASTART GC_data_start
 505       extern int _end;
 506 #     define DATAEND (&_end)
 507 #   endif
 508 # endif
 509
 510 # ifdef VAX
 511 #   define MACH_TYPE "VAX"
 512 #   define ALIGNMENT 4  /* Pointers are longword aligned by 4.2 C compiler */
 513     extern char etext;
 514 #   define DATASTART ((ptr_t)(&etext))
 515 #   ifdef BSD
 516 #       define OS_TYPE "BSD"
 517 #       define HEURISTIC1
 518                         /* HEURISTIC2 may be OK, but it's hard to test. */
 519 #   endif
 520 #   ifdef ULTRIX
 521 #       define OS_TYPE "ULTRIX"
 522 #       define STACKBOTTOM ((ptr_t) 0x7fffc800)
 523 #   endif
 524 # endif
 525
 526 # ifdef RT
 527 #   define MACH_TYPE "RT"
 528 #   define ALIGNMENT 4
 529 #   define DATASTART ((ptr_t) 0x10000000)
 530 #   define STACKBOTTOM ((ptr_t) 0x1fffd800)
 531 # endif
 532
 533 # ifdef SPARC
 534 #   define MACH_TYPE "SPARC"
 535 #   define ALIGNMENT 4  /* Required by hardware */
 536 #   define ALIGN_DOUBLE
 537     extern int etext;
 538 #   ifdef SUNOS5
 539 #       define OS_TYPE "SUNOS5"
 540         extern int _etext;
 541         extern int _end;
 542         extern char * GC_SysVGetDataStart();
 543 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
 544 #       define DATAEND (&_end)
 545 #       ifndef USE_MMAP
 546 #           define USE_MMAP
 547 #       endif
 548 #       ifdef USE_MMAP
 549 #         define HEAP_START (ptr_t)0x40000000
 550 #       else
 551 #         define HEAP_START DATAEND
 552 #       endif
 553 #       define PROC_VDB
 554 /*      HEURISTIC1 reportedly no longer works under 2.7.  Thus we       */
 555 /*      switched to HEURISTIC2, eventhough it creates some debugging    */
 556 /*      issues.                                                         */
 557 #       define HEURISTIC2
 558 #       include <unistd.h>
 559 #       define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
 560                 /* getpagesize() appeared to be missing from at least one */
 561                 /* Solaris 5.4 installation.  Weird.                      */
 562 #       define DYNAMIC_LOADING
 563 #   endif
 564 #   ifdef SUNOS4
 565 #       define OS_TYPE "SUNOS4"
 566         /* [If you have a weak stomach, don't read this.]               */
 567         /* We would like to use:                                        */
 568 /* #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
 569         /* This fails occasionally, due to an ancient, but very         */
 570         /* persistent ld bug.  &etext is set 32 bytes too high.         */
 571         /* We instead read the text segment size from the a.out         */
 572         /* header, which happens to be mapped into our address space    */
 573         /* at the start of the text segment.  The detective work here   */
 574         /* was done by Robert Ehrlich, Manuel Serrano, and Bernard      */
 575         /* Serpette of INRIA.                                           */
 576         /* This assumes ZMAGIC, i.e. demand-loadable executables.       */
 577 #       define TEXTSTART 0x2000
 578 #       define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
 579 #       define MPROTECT_VDB
 580 #       define HEURISTIC1
 581 #       define DYNAMIC_LOADING
 582 #   endif
 583 #   ifdef DRSNX
 584 #       define CPP_WORDSZ 32
 585 #       define OS_TYPE "DRSNX"
 586         extern char * GC_SysVGetDataStart();
 587         extern int etext;
 588 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
 589 #       define MPROTECT_VDB
 590 #       define STACKBOTTOM ((ptr_t) 0xdfff0000)
 591 #       define DYNAMIC_LOADING
 592 #   endif
 593 #   ifdef LINUX
 594 #     define OS_TYPE "LINUX"
 595 #     ifdef __ELF__
 596 #         define DATASTART GC_data_start
 597 #         define DYNAMIC_LOADING
 598 #     else
 599           Linux Sparc non elf ?
 600 #     endif
 601       extern int _end;
 602 #     define DATAEND (&_end)
 603 #     define SVR4
 604 #     define STACKBOTTOM ((ptr_t) 0xf0000000)
 605 #   endif
 606 # endif
 607
 608 # ifdef I386
 609 #   define MACH_TYPE "I386"
 610 #   define ALIGNMENT 4  /* Appears to hold for all "32 bit" compilers   */
 611                         /* except Borland.  The -a4 option fixes        */
 612                         /* Borland.                                     */
 613                         /* Ivan Demakov: For Watcom the option is -zp4. */
 614 #   ifndef SMALL_CONFIG
 615 #     define ALIGN_DOUBLE /* Not strictly necessary, but may give speed   */
 616                           /* improvement on Pentiums.                     */
 617 #   endif
 618 #   ifdef SEQUENT
 619 #       define OS_TYPE "SEQUENT"
 620         extern int etext;
 621 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 622 #       define STACKBOTTOM ((ptr_t) 0x3ffff000)
 623 #   endif
 624 #   ifdef SUNOS5
 625 #       define OS_TYPE "SUNOS5"
 626         extern int etext, _start;
 627         extern char * GC_SysVGetDataStart();
 628 #       define DATASTART GC_SysVGetDataStart(0x1000, &etext)
 629 #       define STACKBOTTOM ((ptr_t)(&_start))
 630 /** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
 631 /*#     define PROC_VDB*/
 632 #       define DYNAMIC_LOADING
 633 #       ifndef USE_MMAP
 634 #           define USE_MMAP
 635 #       endif
 636 #       ifdef USE_MMAP
 637 #         define HEAP_START (ptr_t)0x40000000
 638 #       else
 639 #         define HEAP_START DATAEND
 640 #       endif
 641 #   endif
 642 #   ifdef SCO
 643 #       define OS_TYPE "SCO"
 644         extern int etext;
 645 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
 646                                   & ~0x3fffff) \
 647                                  +((word)&etext & 0xfff))
 648 #       define STACKBOTTOM ((ptr_t) 0x7ffffffc)
 649 #   endif
 650 #   ifdef SCO_ELF
 651 #       define OS_TYPE "SCO_ELF"
 652         extern int etext;
 653 #       define DATASTART ((ptr_t)(&etext))
 654 #       define STACKBOTTOM ((ptr_t) 0x08048000)
 655 #       define DYNAMIC_LOADING
 656 #       define ELF_CLASS ELFCLASS32
 657 #   endif
 658 #   ifdef LINUX
 659 #       define OS_TYPE "LINUX"
 660 #       define STACKBOTTOM ((ptr_t)0xc0000000)
 661         /* Appears to be 0xe0000000 for at least one 2.1.91 kernel.     */
 662         /* Probably needs to be more flexible, but I don't yet          */
 663         /* fully understand how flexible.                               */
 664 #       if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
 665 #           define MPROTECT_VDB
 666 #       else
 667             /* We seem to get random errors in incremental mode,        */
 668             /* possibly because Linux threads is itself a malloc client */
 669             /* and can't deal with the signals.                         */
 670 #       endif
 671 #       ifdef __ELF__
 672 #            define DYNAMIC_LOADING
 673 #            ifdef UNDEFINED    /* includes ro data */
 674                extern int _etext;
 675 #              define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
 676 #            endif
 677 #            include <features.h>
 678 #            if defined(__GLIBC__) && __GLIBC__ >= 2
 679                  extern int __data_start;
 680 #                define DATASTART ((ptr_t)(&__data_start))
 681 #            else
 682                  extern char **__environ;
 683 #                define DATASTART ((ptr_t)(&__environ))
 684                               /* hideous kludge: __environ is the first */
 685                               /* word in crt0.o, and delimits the start */
 686                               /* of the data segment, no matter which   */
 687                               /* ld options were passed through.        */
 688                               /* We could use _etext instead, but that  */
 689                               /* would include .rodata, which may       */
 690                               /* contain large read-only data tables    */
 691                               /* that we'd rather not scan.             */
 692 #            endif
 693              extern int _end;
 694 #            define DATAEND (&_end)
 695 #       else
 696              extern int etext;
 697 #            define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
 698 #       endif
 699 #   endif
 700 #   ifdef CYGWIN32
 701 #       define OS_TYPE "CYGWIN32"
 702           extern int _data_start__;
 703           extern int _data_end__;
 704           extern int _bss_start__;
 705           extern int _bss_end__;
 706         /* For binutils 2.9.1, we have                  */
 707         /*      DATASTART   = _data_start__             */
 708         /*      DATAEND     = _bss_end__                */
 709         /* whereas for some earlier versions it was     */
 710         /*      DATASTART   = _bss_start__              */
 711         /*      DATAEND     = _data_end__               */
 712         /* To get it right for both, we take the        */
 713         /* minumum/maximum of the two.                  */
 714 #       define MAX(x,y) ((x) > (y) ? (x) : (y))
 715 #       define MIN(x,y) ((x) < (y) ? (x) : (y))
 716 #       define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
 717 #       define DATAEND   ((ptr_t) MAX(&_data_end__, &_bss_end__))
 718 #       undef STACK_GRAN
 719 #       define STACK_GRAN 0x10000
 720 #       define HEURISTIC1
 721 #   endif
 722 #   ifdef OS2
 723 #       define OS_TYPE "OS2"
 724                 /* STACKBOTTOM and DATASTART are handled specially in   */
 725                 /* os_dep.c. OS2 actually has the right                 */
 726                 /* system call!                                         */
 727 #       define DATAEND  /* not needed */
 728 #   endif
 729 #   ifdef MSWIN32
 730 #       define OS_TYPE "MSWIN32"
 731                 /* STACKBOTTOM and DATASTART are handled specially in   */
 732                 /* os_dep.c.                                            */
 733 #       ifndef __WATCOMC__
 734 #         define MPROTECT_VDB
 735 #       endif
 736 #       define DATAEND  /* not needed */
 737 #   endif
 738 #   ifdef DJGPP
 739 #       define OS_TYPE "DJGPP"
 740 #       include "stubinfo.h"
 741         extern int etext;
 742         extern int _stklen;
 743         extern int __djgpp_stack_limit;
 744 #       define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
 745 /* #       define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
 746                                                      + _stklen)) */
 747 #       define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
 748                 /* This may not be right.  */
 749 #   endif
 750 #   ifdef OPENBSD
 751 #       define OS_TYPE "OPENBSD"
 752 #   endif
 753 #   ifdef FREEBSD
 754 #       define OS_TYPE "FREEBSD"
 755 #       define MPROTECT_VDB
 756 #   endif
 757 #   ifdef NETBSD
 758 #       define OS_TYPE "NETBSD"
 759 #   endif
 760 #   ifdef THREE86BSD
 761 #       define OS_TYPE "THREE86BSD"
 762 #   endif
 763 #   ifdef BSDI
 764 #       define OS_TYPE "BSDI"
 765 #   endif
 766 #   if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
 767         || defined(THREE86BSD) || defined(BSDI)
 768 #       define HEURISTIC2
 769         extern char etext;
 770 #       define DATASTART ((ptr_t)(&etext))
 771 #   endif
 772 #   ifdef NEXT
 773 #       define OS_TYPE "NEXT"
 774 #       define DATASTART ((ptr_t) get_etext())
 775 #       define STACKBOTTOM ((ptr_t)0xc0000000)
 776 #       define DATAEND  /* not needed */
 777 #   endif
 778 #   ifdef DOS4GW
 779 #     define OS_TYPE "DOS4GW"
 780       extern long __nullarea;
 781       extern char _end;
 782       extern char *_STACKTOP;
 783       /* Depending on calling conventions Watcom C either precedes
 784          or does not precedes with undescore names of C-variables.
 785          Make sure startup code variables always have the same names.  */
 786       #pragma aux __nullarea "*";
 787       #pragma aux _end "*";
 788 #     define STACKBOTTOM ((ptr_t) _STACKTOP)
 789                          /* confused? me too. */
 790 #     define DATASTART ((ptr_t) &__nullarea)
 791 #     define DATAEND ((ptr_t) &_end)
 792 #   endif
 793 # endif
 794
 795 # ifdef NS32K
 796 #   define MACH_TYPE "NS32K"
 797 #   define ALIGNMENT 4
 798     extern char **environ;
 799 #   define DATASTART ((ptr_t)(&environ))
 800                               /* hideous kludge: environ is the first   */
 801                               /* word in crt0.o, and delimits the start */
 802                               /* of the data segment, no matter which   */
 803                               /* ld options were passed through.        */
 804 #   define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
 805 # endif
 806
 807 # ifdef MIPS
 808 #   define MACH_TYPE "MIPS"
 809 #   ifndef IRIX5
 810 #     define DATASTART (ptr_t)0x10000000
 811                               /* Could probably be slightly higher since */
 812                               /* startup code allocates lots of stuff.   */
 813 #   else
 814       extern int _fdata;
 815 #     define DATASTART ((ptr_t)(&_fdata))
 816 #     ifdef USE_MMAP
 817 #         define HEAP_START (ptr_t)0x30000000
 818 #     else
 819 #         define HEAP_START DATASTART
 820 #     endif
 821                               /* Lowest plausible heap address.         */
 822                               /* In the MMAP case, we map there.        */
 823                               /* In either case it is used to identify  */
 824                               /* heap sections so they're not           */
 825                               /* considered as roots.                   */
 826 #   endif /* IRIX5 */
 827 #   define HEURISTIC2
 828 /* #   define STACKBOTTOM ((ptr_t)0x7fff8000)  sometimes also works.  */
 829 #   ifdef ULTRIX
 830 #       define OS_TYPE "ULTRIX"
 831 #       define ALIGNMENT 4
 832 #   endif
 833 #   ifdef RISCOS
 834 #       define OS_TYPE "RISCOS"
 835 #       define ALIGNMENT 4  /* Required by hardware */
 836 #   endif
 837 #   ifdef IRIX5
 838 #       define OS_TYPE "IRIX5"
 839 #       define MPROTECT_VDB
 840 #       ifdef _MIPS_SZPTR
 841 #         define CPP_WORDSZ _MIPS_SZPTR
 842 #         define ALIGNMENT (_MIPS_SZPTR/8)
 843 #         if CPP_WORDSZ != 64
 844 #           define ALIGN_DOUBLE
 845 #         endif
 846 #       else
 847 #         define ALIGNMENT 4
 848 #         define ALIGN_DOUBLE
 849 #       endif
 850 #       define DYNAMIC_LOADING
 851 #   endif
 852 # endif
 853
 854 # ifdef RS6000
 855 #   define MACH_TYPE "RS6000"
 856 #   define ALIGNMENT 4
 857 #   define DATASTART ((ptr_t)0x20000000)
 858     extern int errno;
 859 #   define STACKBOTTOM ((ptr_t)((ulong)&errno))
 860 #   define DYNAMIC_LOADING
 861         /* For really old versions of AIX, this may have to be removed. */
 862 # endif
 863
 864 # ifdef HP_PA
 865 #   define MACH_TYPE "HP_PA"
 866 #   define ALIGNMENT 4
 867 #   define ALIGN_DOUBLE
 868     extern int __data_start;
 869 #   define DATASTART ((ptr_t)(&__data_start))
 870 #   if 0
 871         /* The following appears to work for 7xx systems running HP/UX  */
 872         /* 9.xx Furthermore, it might result in much faster             */
 873         /* collections than HEURISTIC2, which may involve scanning      */
 874         /* segments that directly precede the stack.  It is not the     */
 875         /* default, since it may not work on older machine/OS           */
 876         /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
 877         /* this.)                                                       */
 878 #       define STACKBOTTOM ((ptr_t) 0x7b033000)  /* from /etc/conf/h/param.h */
 879 #   else
 880 #       define HEURISTIC2
 881 #   endif
 882 #   define STACK_GROWS_UP
 883 #   define DYNAMIC_LOADING
 884 #   include <unistd.h>
 885 #   define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
 886         /* They misspelled the Posix macro?     */
 887 # endif
 888
 889 # ifdef ALPHA
 890 #   define MACH_TYPE "ALPHA"
 891 #   define ALIGNMENT 8
 892 #   ifdef OSF1
 893 #       define OS_TYPE "OSF1"
 894 #       define DATASTART ((ptr_t) 0x140000000)
 895         extern _end;
 896 #       define DATAEND ((ptr_t) &_end)
 897 #       define HEURISTIC2
 898         /* Normally HEURISTIC2 is too conervative, since                */
 899         /* the text segment immediately follows the stack.              */
 900         /* Hence we give an upper pound.                                */
 901         extern int __start;
 902 #       define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
 903 #       define CPP_WORDSZ 64
 904 #       define MPROTECT_VDB
 905 #       define DYNAMIC_LOADING
 906 #   endif
 907 #   ifdef LINUX
 908 #       define OS_TYPE "LINUX"
 909 #       define CPP_WORDSZ 64
 910 #       define STACKBOTTOM ((ptr_t) 0x120000000)
 911 #       ifdef __ELF__
 912             extern int __data_start;
 913 #           define DATASTART &__data_start
 914 #           define DYNAMIC_LOADING
 915 #       else
 916 #           define DATASTART ((ptr_t) 0x140000000)
 917 #       endif
 918         extern int _end;
 919 #       define DATAEND (&_end)
 920 #       define MPROTECT_VDB
 921                 /* Has only been superficially tested.  May not */
 922                 /* work on all versions.                        */
 923 #   endif
 924 # endif
 925
 926 # ifdef M88K
 927 #   define MACH_TYPE "M88K"
 928 #   define ALIGNMENT 4
 929 #   define ALIGN_DOUBLE
 930     extern int etext;
 931 #   ifdef CX_UX
 932 #       define OS_TYPE "CX_UX"
 933 #       define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
 934 #   endif
 935 #   ifdef  DGUX
 936 #       define OS_TYPE "DGUX"
 937         extern char * GC_SysVGetDataStart();
 938 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
 939 #   endif
 940 #   define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
 941 # endif
 942
 943 # ifdef S370
 944 #   define MACH_TYPE "S370"
 945 #   define OS_TYPE "UTS4"
 946 #   define ALIGNMENT 4  /* Required by hardware */
 947     extern int etext;
 948         extern int _etext;
 949         extern int _end;
 950         extern char * GC_SysVGetDataStart();
 951 #       define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
 952 #       define DATAEND (&_end)
 953 #       define HEURISTIC2
 954 # endif
 955
 956 # ifndef STACK_GROWS_UP
 957 #   define STACK_GROWS_DOWN
 958 # endif
 959
 960 # ifndef CPP_WORDSZ
 961 #   define CPP_WORDSZ 32
 962 # endif
 963
 964 # ifndef OS_TYPE
 965 #   define OS_TYPE ""
 966 # endif
 967
 968 # ifndef DATAEND
 969     extern int end;
 970 #   define DATAEND (&end)
 971 # endif
 972
 973 # if defined(SVR4) && !defined(GETPAGESIZE)
 974 #    include <unistd.h>
 975 #    define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
 976 # endif
 977
 978 # ifndef GETPAGESIZE
 979 #   if defined(SUNOS5) || defined(IRIX5)
 980 #       include <unistd.h>
 981 #   endif
 982 #   define GETPAGESIZE() getpagesize()
 983 # endif
 984
 985 # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
 986     /* OS has SVR4 generic features.  Probably others also qualify.     */
 987 #   define SVR4
 988 # endif
 989
 990 # if defined(SUNOS5) || defined(DRSNX)
 991     /* OS has SUNOS5 style semi-undocumented interface to dynamic       */
 992     /* loader.                                                          */
 993 #   define SUNOS5DL
 994     /* OS has SUNOS5 style signal handlers.                             */
 995 #   define SUNOS5SIGS
 996 # endif
 997
 998 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
 999    -> bad word size
1000 # endif
1001
1002 # ifdef PCR
1003 #   undef DYNAMIC_LOADING
1004 #   undef STACKBOTTOM
1005 #   undef HEURISTIC1
1006 #   undef HEURISTIC2
1007 #   undef PROC_VDB
1008 #   undef MPROTECT_VDB
1009 #   define PCR_VDB
1010 # endif
1011
1012 # ifdef SRC_M3
1013 /* Postponed for now. */
1014 #   undef PROC_VDB
1015 #   undef MPROTECT_VDB
1016 # endif
1017
1018 # ifdef SMALL_CONFIG
1019 /* Presumably not worth the space it takes. */
1020 #   undef PROC_VDB
1021 #   undef MPROTECT_VDB
1022 # endif
1023
1024 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
1025 #   define DEFAULT_VDB
1026 # endif
1027
1028 # if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
1029 #   define SOLARIS_THREADS
1030 # endif
1031 # if defined(IRIX_THREADS) && !defined(IRIX5)
1032 --> inconsistent configuration
1033 # endif
1034 # if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
1035 --> inconsistent configuration
1036 # endif
1037 # if defined(LINUX_THREADS) && !defined(LINUX)
1038 --> inconsistent configuration
1039 # endif
1040 # if defined(SOLARIS_THREADS) && !defined(SUNOS5)
1041 --> inconsistent configuration
1042 # endif
1043 # if defined(PCR) || defined(SRC_M3) || \
1044         defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
1045         defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
1046         defined(IRIX_JDK_THREADS)
1047 #   define THREADS
1048 # endif
1049
1050 # if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
1051      || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
1052         /* Use setjmp based hack to mark from callee-save registers. */
1053 #       define USE_GENERIC_PUSH_REGS
1054 # endif
1055 # if defined(SPARC) && !defined(LINUX)
1056 #   define SAVE_CALL_CHAIN
1057 #   define ASM_CLEAR_CODE       /* Stack clearing is crucial, and we    */
1058                                 /* include assembly code to do it well. */
1059 # endif
1060
1061 # endif