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 * Copyright (c) 2000-2004 Hewlett-Packard Development Company, L.P.
7 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
8 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
10 * Permission is hereby granted to use or copy this program
11 * for any purpose, provided the above notices are retained on all copies.
12 * Permission to modify the code and to distribute modified code is granted,
13 * provided the above notices are retained, and a notice that the code was
14 * modified is included with the above copyright notice.
18 * This header is private to the gc. It is almost always included from
19 * gc_priv.h. However it is possible to include it by itself if just the
20 * configuration macros are needed. In that
21 * case, a few declarations relying on types declared in gc_priv.h will be
30 /* Fake ptr_t declaration, just to avoid compilation errors. */
31 /* This avoids many instances if "ifndef GC_PRIVATE_H" below. */
32 typedef struct GC_undefined_struct * ptr_t;
35 /* Machine dependent parameters. Some tuning parameters can be found */
36 /* near the top of gc_private.h. */
38 /* Machine specific parts contributed by various people. See README file. */
40 /* First a unified test for Linux: */
41 # if defined(linux) || defined(__linux__)
47 /* And one for NetBSD: */
48 # if defined(__NetBSD__)
52 /* And one for OpenBSD: */
53 # if defined(__OpenBSD__)
57 /* And one for FreeBSD: */
58 # if (defined(__FreeBSD__) || defined(__DragonFly__) || \
59 defined(__FreeBSD_kernel__)) && !defined(FREEBSD)
63 /* Determine the machine type: */
64 # if defined(__arm__) || defined(__thumb__)
66 # if !defined(LINUX) && !defined(NETBSD)
68 # define mach_type_known
71 # if defined(sun) && defined(mc68000)
74 # define mach_type_known
76 # if defined(hp9000s300)
79 # define mach_type_known
81 # if defined(OPENBSD) && defined(m68k)
83 # define mach_type_known
85 # if defined(OPENBSD) && defined(__sparc__)
87 # define mach_type_known
89 # if defined(NETBSD) && (defined(m68k) || defined(__m68k__))
91 # define mach_type_known
93 # if defined(NETBSD) && defined(__powerpc__)
95 # define mach_type_known
97 # if defined(NETBSD) && (defined(__arm32__) || defined(__arm__))
99 # define mach_type_known
101 # if defined(NETBSD) && defined(__sh__)
103 # define mach_type_known
112 # define mach_type_known
114 # if defined(__NetBSD__) && defined(__vax__)
116 # define mach_type_known
118 # if defined(mips) || defined(__mips) || defined(_mips)
120 # if defined(nec_ews) || defined(_nec_ews)
123 # if !defined(LINUX) && !defined(EWS4800) && !defined(NETBSD)
124 # if defined(ultrix) || defined(__ultrix)
127 # if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \
128 || defined(__SYSTYPE_SVR4__)
129 # define IRIX5 /* or IRIX 6.X */
131 # define RISCOS /* or IRIX 4.X */
135 # if defined(__NetBSD__) && defined(__MIPSEL__)
138 # define mach_type_known
140 # if defined(DGUX) && (defined(i386) || defined(__i386__))
145 # define mach_type_known
147 # if defined(sequent) && (defined(i386) || defined(__i386__))
150 # define mach_type_known
152 # if defined(sun) && (defined(i386) || defined(__i386__))
155 # define mach_type_known
157 # if defined(sun) && defined(__amd64)
160 # define mach_type_known
162 # if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
165 # define mach_type_known
169 # define mach_type_known
171 # if defined(sun) && (defined(sparc) || defined(__sparc))
173 /* Test for SunOS 5.x */
180 # define mach_type_known
182 # if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
183 && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__FreeBSD__) \
184 && !defined(__DragonFly__)
187 # define mach_type_known
191 # define mach_type_known
193 # if defined(__NetBSD__) && defined(__sparc__)
195 # define mach_type_known
197 # if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
198 /* The above test may need refinement */
200 # if defined(_SCO_ELF)
205 # define mach_type_known
207 # if defined(_AUX_SOURCE)
210 # define mach_type_known
212 # if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
213 || defined(hppa) || defined(__hppa__)
215 # if !defined(LINUX) && !defined(HPUX)
218 # define mach_type_known
220 # if defined(__ia64) && defined(_HPUX_SOURCE)
225 # define mach_type_known
227 # if defined(__BEOS__) && defined(_X86_)
230 # define mach_type_known
232 # if defined(LINUX) && (defined(i386) || defined(__i386__))
234 # define mach_type_known
236 # if defined(LINUX) && defined(__x86_64__)
238 # define mach_type_known
240 # if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
242 # define mach_type_known
244 # if defined(LINUX) && defined(__arm__)
246 # define mach_type_known
248 # if defined(LINUX) && defined(__cris__)
252 # define mach_type_known
254 # if defined(LINUX) && (defined(powerpc) || defined(__powerpc__) || \
255 defined(powerpc64) || defined(__powerpc64__))
257 # define mach_type_known
259 # if defined(FREEBSD) && (defined(powerpc) || defined(__powerpc__))
261 # define mach_type_known
263 # if defined(LINUX) && defined(__mc68000__)
265 # define mach_type_known
267 # if defined(LINUX) && (defined(sparc) || defined(__sparc__))
269 # define mach_type_known
271 # if defined(LINUX) && defined(__arm__)
273 # define mach_type_known
275 # if defined(LINUX) && defined(__sh__)
277 # define mach_type_known
279 # if defined(LINUX) && defined(__m32r__)
281 # define mach_type_known
283 # if defined(__alpha) || defined(__alpha__)
285 # if !defined(LINUX) && !defined(NETBSD) && !defined(OPENBSD) && !defined(FREEBSD)
286 # define OSF1 /* a.k.a Digital Unix */
288 # define mach_type_known
290 # if defined(_AMIGA) && !defined(AMIGA)
295 # define mach_type_known
297 # if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
300 # define mach_type_known
302 # if defined(__MWERKS__) && defined(__powerc) && !defined(__MACH__)
305 # define mach_type_known
307 # if defined(macosx) || (defined(__APPLE__) && defined(__MACH__))
309 # if defined(__ppc__) || defined(__ppc64__)
311 # define mach_type_known
313 # if defined(__i386__)
315 # define mach_type_known
318 # if defined(NeXT) && defined(mc68000)
321 # define mach_type_known
323 # if defined(NeXT) && (defined(i386) || defined(__i386__))
326 # define mach_type_known
328 # if defined(__OpenBSD__) && (defined(i386) || defined(__i386__))
331 # define mach_type_known
333 # if defined(FREEBSD) && (defined(i386) || defined(__i386__))
335 # define mach_type_known
337 # if defined(__NetBSD__) && (defined(i386) || defined(__i386__))
339 # define mach_type_known
341 # if defined(__NetBSD__) && defined(__x86_64__)
343 # define mach_type_known
345 # if defined(FREEBSD) && defined(__sparc__)
347 # define mach_type_known
349 # if defined(bsdi) && (defined(i386) || defined(__i386__))
352 # define mach_type_known
354 # if !defined(mach_type_known) && defined(__386BSD__)
357 # define mach_type_known
359 # if defined(_CX_UX) && defined(_M88K)
362 # define mach_type_known
364 # if defined(DGUX) && defined(m88k)
367 # define mach_type_known
369 # if defined(_WIN32_WCE)
370 /* SH3, SH4, MIPS already defined for corresponding architectures */
371 # if defined(SH3) || defined(SH4)
381 # define mach_type_known
383 # if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
384 || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
386 # define MSWIN32 /* or Win32s */
387 # define mach_type_known
389 # if defined(_MSC_VER) && defined(_M_IA64)
391 # define MSWIN32 /* Really win64, but we don't treat 64-bit */
392 /* variants as a differnt platform. */
395 # if defined(__DJGPP__)
398 # define DJGPP /* MSDOS running the DJGPP port of GCC */
400 # define mach_type_known
402 # if defined(__CYGWIN32__) || defined(__CYGWIN__)
405 # define mach_type_known
407 # if defined(__MINGW32__)
410 # define mach_type_known
412 # if defined(__BORLANDC__)
415 # define mach_type_known
417 # if defined(_UTS) && !defined(mach_type_known)
420 # define mach_type_known
424 # define mach_type_known
426 # if defined(__embedded__) && defined(PPC)
429 # define mach_type_known
432 # if defined(__WATCOMC__) && defined(__386__)
434 # if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
435 # if defined(__OS2__)
438 # if defined(__WINDOWS_386__) || defined(__NT__)
445 # define mach_type_known
447 # if defined(__s390__) && defined(LINUX)
449 # define mach_type_known
451 # if defined(__GNU__)
452 # if defined(__i386__)
453 /* The Debian Hurd running on generic PC */
456 # define mach_type_known
459 # if defined(__TANDEM)
460 /* Nonstop S-series */
461 /* FIXME: Should recognize Integrity series? */
464 # define mach_type_known
467 /* Feel free to add more clauses here */
469 /* Or manually define the machine type here. A machine type is */
470 /* characterized by the architecture. Some */
471 /* machine types are further subdivided by OS. */
472 /* the macros ULTRIX, RISCOS, and BSD to distinguish. */
473 /* Note that SGI IRIX is treated identically to RISCOS. */
474 /* SYSV on an M68K actually means A/UX. */
475 /* The distinction in these cases is usually the stack starting address */
476 # ifndef mach_type_known
477 --> unknown machine type
479 /* Mapping is: M68K ==> Motorola 680X0 */
480 /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
481 /* MACOS and AMIGA variants) */
482 /* I386 ==> Intel 386 */
483 /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
484 /* FREEBSD, THREE86BSD, MSWIN32, */
485 /* BSDI,SUNOS5, NEXT, other variants) */
486 /* NS32K ==> Encore Multimax */
487 /* MIPS ==> R2000 through R14K */
488 /* (many variants) */
489 /* VAX ==> DEC VAX */
490 /* (BSD, ULTRIX variants) */
491 /* RS6000 ==> IBM RS/6000 AIX3.X */
492 /* RT ==> IBM PC/RT */
493 /* HP_PA ==> HP9000/700 & /800 */
495 /* SPARC ==> SPARC v7/v8/v9 */
496 /* (SUNOS4, SUNOS5, LINUX, */
497 /* DRSNX variants) */
498 /* ALPHA ==> DEC Alpha */
499 /* (OSF1 and LINUX variants) */
500 /* M88K ==> Motorola 88XX0 */
501 /* (CX_UX and DGUX) */
502 /* S370 ==> 370-like machine */
503 /* running Amdahl UTS4 */
504 /* S390 ==> 390-like machine */
506 /* ARM32 ==> Intel StrongARM */
507 /* IA64 ==> Intel IPF */
509 /* (LINUX and HPUX) */
510 /* SH ==> Hitachi SuperH */
511 /* (LINUX & MSWINCE) */
512 /* X86_64 ==> AMD x86-64 */
513 /* POWERPC ==> IBM/Apple PowerPC */
514 /* (MACOS(<=9),DARWIN(incl.MACOSX),*/
515 /* LINUX, NETBSD, NOSYS variants) */
516 /* Handles 32 and 64-bit variants. */
517 /* AIX should be handled here, but */
518 /* that's called an RS6000. */
519 /* CRIS ==> Axis Etrax */
520 /* M32R ==> Renesas M32R */
524 * For each architecture and OS, the following need to be defined:
526 * CPP_WORDSZ is a simple integer constant representing the word size.
527 * in bits. We assume byte addressibility, where a byte has 8 bits.
528 * We also assume CPP_WORDSZ is either 32 or 64.
529 * (We care about the length of pointers, not hardware
530 * bus widths. Thus a 64 bit processor with a C compiler that uses
531 * 32 bit pointers should use CPP_WORDSZ of 32, not 64. Default is 32.)
533 * MACH_TYPE is a string representation of the machine type.
534 * OS_TYPE is analogous for the OS.
536 * ALIGNMENT is the largest N, such that
537 * all pointer are guaranteed to be aligned on N byte boundaries.
538 * defining it to be 1 will always work, but perform poorly.
540 * DATASTART is the beginning of the data segment.
541 * On some platforms SEARCH_FOR_DATA_START is defined.
542 * SEARCH_FOR_DATASTART will cause GC_data_start to
543 * be set to an address determined by accessing data backwards from _end
544 * until an unmapped page is found. DATASTART will be defined to be
546 * On UNIX-like systems, the collector will scan the area between DATASTART
547 * and DATAEND for root pointers.
549 * DATAEND, if not `end' where `end' is defined as ``extern int end[];''.
550 * RTH suggests gaining access to linker script synth'd values with
551 * this idiom instead of `&end' where `end' is defined as ``extern int end;'' .
552 * Otherwise, ``GCC will assume these are in .sdata/.sbss'' and it will, e.g.,
553 * cause failures on alpha*-*-* with ``-msmall-data or -fpic'' or mips-*-*
554 * without any special options.
556 * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
559 * STACKBOTTOM is the cool end of the stack, which is usually the
560 * highest address in the stack.
561 * Under PCR or OS/2, we have other ways of finding thread stacks.
562 * For each machine, the following should:
563 * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
564 * 2) define exactly one of
565 * STACKBOTTOM (should be defined to be an expression)
569 * If STACKBOTTOM is defined, then it's value will be used directly as the
570 * stack base. If LINUX_STACKBOTTOM is defined, then it will be determined
571 * with a method appropriate for most Linux systems. Currently we look
572 * first for __libc_stack_end, and if that fails read it from /proc.
573 * If either of the last two macros are defined, then STACKBOTTOM is computed
574 * during collector startup using one of the following two heuristics:
575 * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
576 * the next multiple of STACK_GRAN.
577 * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
578 * in small steps (decrement if STACK_GROWS_UP), and read the value
579 * at each location. Remember the value when the first
580 * Segmentation violation or Bus error is signalled. Round that
581 * to the nearest plausible page boundary, and use that instead
584 * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
585 * the value of environ is a pointer that can serve as STACKBOTTOM.
586 * I expect that HEURISTIC2 can be replaced by this approach, which
587 * interferes far less with debugging. However it has the disadvantage
588 * that it's confused by a putenv call before the collector is initialized.
589 * This could be dealt with by intercepting putenv ...
591 * If no expression for STACKBOTTOM can be found, and neither of the above
592 * heuristics are usable, the collector can still be used with all of the above
593 * undefined, provided one of the following is done:
594 * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
595 * without reference to STACKBOTTOM. This is appropriate for use in
596 * conjunction with thread packages, since there will be multiple stacks.
597 * (Allocating thread stacks in the heap, and treating them as ordinary
598 * heap data objects is also possible as a last resort. However, this is
599 * likely to introduce significant amounts of excess storage retention
600 * unless the dead parts of the thread stacks are periodically cleared.)
601 * 2) Client code may set GC_stackbottom before calling any GC_ routines.
602 * If the author of the client code controls the main program, this is
603 * easily accomplished by introducing a new main program, setting
604 * GC_stackbottom to the address of a local variable, and then calling
605 * the original main program. The new main program would read something
608 * # include "gc_private.h"
610 * main(argc, argv, envp)
612 * char **argv, **envp;
616 * GC_stackbottom = (ptr_t)(&dummy);
617 * return(real_main(argc, argv, envp));
621 * Each architecture may also define the style of virtual dirty bit
622 * implementation to be used:
623 * MPROTECT_VDB: Write protect the heap and catch faults.
624 * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
626 * An architecture may define DYNAMIC_LOADING if dynamic_load.c
627 * defined GC_register_dynamic_libraries() for the architecture.
629 * An architecture may define PREFETCH(x) to preload the cache with *x.
630 * This defaults to a no-op.
632 * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
634 * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
635 * clear the two words at GC_malloc-aligned address x. By default,
636 * word stores of 0 are used instead.
638 * HEAP_START may be defined as the initial address hint for mmap-based
642 /* If we are using a recent version of gcc, we can use __builtin_unwind_init()
643 * to push the relevant registers onto the stack. This generally makes
644 * USE_GENERIC_PUSH_REGS the preferred approach for marking from registers.
646 # if defined(__GNUC__) && ((__GNUC__ >= 3) || \
647 (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)) \
648 && !defined(__INTEL_COMPILER) \
649 && !defined(__PATHCC__)
650 # define HAVE_BUILTIN_UNWIND_INIT
653 # define STACK_GRAN 0x1000000
655 # define MACH_TYPE "M68K"
658 # define OS_TYPE "OPENBSD"
661 # define DATASTART GC_data_start
662 # define DYNAMIC_LOADING
665 # define DATASTART ((ptr_t)(etext))
667 # define USE_GENERIC_PUSH_REGS
670 # define OS_TYPE "NETBSD"
673 # define DATASTART GC_data_start
674 # define DYNAMIC_LOADING
677 # define DATASTART ((ptr_t)(etext))
679 # define USE_GENERIC_PUSH_REGS
682 # define OS_TYPE "LINUX"
683 # define STACKBOTTOM ((ptr_t)0xf0000000)
684 # define USE_GENERIC_PUSH_REGS
685 /* We never got around to the assembly version. */
686 /* # define MPROTECT_VDB - Reported to not work 9/17/01 */
688 # define DYNAMIC_LOADING
689 # include <features.h>
690 # if defined(__GLIBC__)&& __GLIBC__>=2
691 # define SEARCH_FOR_DATA_START
693 extern char **__environ;
694 # define DATASTART ((ptr_t)(&__environ))
695 /* hideous kludge: __environ is the first */
696 /* word in crt0.o, and delimits the start */
697 /* of the data segment, no matter which */
698 /* ld options were passed through. */
699 /* We could use _etext instead, but that */
700 /* would include .rodata, which may */
701 /* contain large read-only data tables */
702 /* that we'd rather not scan. */
703 # endif /* !GLIBC2 */
705 # define DATAEND (_end)
708 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
712 # define OS_TYPE "SUNOS4"
714 # define DATASTART ((ptr_t)((((word) (etext)) + 0x1ffff) & ~0x1ffff))
715 # define HEURISTIC1 /* differs */
716 # define DYNAMIC_LOADING
719 # define OS_TYPE "HP"
721 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
722 # define STACKBOTTOM ((ptr_t) 0xffeffffc)
723 /* empirically determined. seems to work. */
725 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
728 # define OS_TYPE "SYSV"
730 # define DATASTART ((ptr_t)((((word) (etext)) + 0x3fffff) \
732 +((word)etext & 0x1fff))
733 /* This only works for shared-text binaries with magic number 0413.
734 The other sorts of SysV binaries put the data at the end of the text,
735 in which case the default of etext would work. Unfortunately,
736 handling both would require having the magic-number available.
739 # define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
740 /* The stack starts at the top of memory, but */
741 /* 0x0 cannot be used as setjump_test complains */
742 /* that the stack direction is incorrect. Two */
743 /* bytes down from 0x0 should be safe enough. */
745 # include <sys/mmu.h>
746 # define GETPAGESIZE() PAGESIZE /* Is this still right? */
749 # define OS_TYPE "AMIGA"
750 /* STACKBOTTOM and DATASTART handled specially */
752 # define DATAEND /* not needed */
753 # define GETPAGESIZE() 4096
759 # define OS_TYPE "MACOS"
760 /* see os_dep.c for details of global data segments. */
761 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
762 # define DATAEND /* not needed */
763 # define GETPAGESIZE() 4096
766 # define OS_TYPE "NEXT"
767 # define DATASTART ((ptr_t) get_etext())
768 # define STACKBOTTOM ((ptr_t) 0x4000000)
769 # define DATAEND /* not needed */
773 # if defined(POWERPC)
774 # define MACH_TYPE "POWERPC"
776 # define ALIGNMENT 2 /* Still necessary? Could it be 4? */
780 # define OS_TYPE "MACOS"
781 /* see os_dep.c for details of global data segments. */
782 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
783 # define DATAEND /* not needed */
786 # if defined(__powerpc64__)
788 # define CPP_WORDSZ 64
790 # define HBLKSIZE 4096
795 # define OS_TYPE "LINUX"
796 /* HEURISTIC1 has been reliably reported to fail for a 32-bit */
797 /* executable on a 64 bit kernel. */
798 # define LINUX_STACKBOTTOM
799 # define DYNAMIC_LOADING
800 # define SEARCH_FOR_DATA_START
802 # define DATAEND (_end)
807 # define CPP_WORDSZ 64
811 # define OS_TYPE "DARWIN"
812 # define DYNAMIC_LOADING
813 /* XXX: see get_end(3), get_etext() and get_end() should not be used.
814 These aren't used when dyld support is enabled (it is by default) */
815 # define DATASTART ((ptr_t) get_etext())
816 # define DATAEND ((ptr_t) get_end())
817 # define STACKBOTTOM ((ptr_t) 0xc0000000)
819 # define USE_MMAP_ANON
820 # define USE_ASM_PUSH_REGS
821 /* This is potentially buggy. It needs more testing. See the comments in
822 os_dep.c. It relies on threads to track writes. */
823 # ifdef GC_DARWIN_THREADS
824 /* # define MPROTECT_VDB -- diabled for now. May work for some apps. */
827 # define GETPAGESIZE() getpagesize()
828 # if defined(USE_PPC_PREFETCH) && defined(__GNUC__)
829 /* The performance impact of prefetches is untested */
830 # define PREFETCH(x) \
831 __asm__ __volatile__ ("dcbt 0,%0" : : "r" ((const void *) (x)))
832 # define PREFETCH_FOR_WRITE(x) \
833 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" ((const void *) (x)))
835 /* There seems to be some issues with trylock hanging on darwin. This
836 should be looked into some more */
837 # define NO_PTHREAD_TRYLOCK
841 # define OS_TYPE "FREEBSD"
842 # ifndef GC_FREEBSD_THREADS
843 # define MPROTECT_VDB
845 # define SIG_SUSPEND SIGUSR1
846 # define SIG_THR_RESTART SIGUSR2
847 # define FREEBSD_STACKBOTTOM
849 # define DYNAMIC_LOADING
852 extern char * GC_FreeBSDGetDataStart();
853 # define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
857 # define OS_TYPE "NETBSD"
860 # define DATASTART GC_data_start
861 # define DYNAMIC_LOADING
865 # define OS_TYPE "NOSYS"
866 extern void __end[], __dso_handle[];
867 # define DATASTART (__dso_handle) /* OK, that's ugly. */
868 # define DATAEND (__end)
869 /* Stack starts at 0xE0000000 for the simulator. */
871 # define STACK_GRAN 0x10000000
877 # define MACH_TYPE "VAX"
878 # define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
880 # define DATASTART ((ptr_t)(etext))
882 # define OS_TYPE "BSD"
884 /* HEURISTIC2 may be OK, but it's hard to test. */
887 # define OS_TYPE "ULTRIX"
888 # define STACKBOTTOM ((ptr_t) 0x7fffc800)
893 # define MACH_TYPE "RT"
895 # define DATASTART ((ptr_t) 0x10000000)
896 # define STACKBOTTOM ((ptr_t) 0x1fffd800)
900 # define MACH_TYPE "SPARC"
901 # if defined(__arch64__) || defined(__sparcv9)
903 # define CPP_WORDSZ 64
904 # define ELF_CLASS ELFCLASS64
906 # define ALIGNMENT 4 /* Required by hardware */
907 # define CPP_WORDSZ 32
909 # define ALIGN_DOUBLE
911 # define OS_TYPE "SUNOS5"
914 extern ptr_t GC_SysVGetDataStart();
915 # define DATASTART GC_SysVGetDataStart(0x10000, _etext)
916 # define DATAEND (_end)
917 # if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
919 /* Otherwise we now use calloc. Mmap may result in the */
920 /* heap interleaved with thread stacks, which can result in */
921 /* excessive blacklisting. Sbrk is unusable since it */
922 /* doesn't interact correctly with the system malloc. */
925 # define HEAP_START (ptr_t)0x40000000
927 # define HEAP_START DATAEND
930 /* HEURISTIC1 reportedly no longer works under 2.7. */
931 /* HEURISTIC2 probably works, but this appears to be preferable. */
932 /* Apparently USRSTACK is defined to be USERLIMIT, but in some */
933 /* installations that's undefined. We work around this with a */
935 # include <sys/vmparam.h>
937 /* This should work everywhere, but doesn't. */
938 # define STACKBOTTOM USRSTACK
943 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
944 /* getpagesize() appeared to be missing from at least one */
945 /* Solaris 5.4 installation. Weird. */
946 # define DYNAMIC_LOADING
949 # define OS_TYPE "SUNOS4"
950 /* [If you have a weak stomach, don't read this.] */
951 /* We would like to use: */
952 /* # define DATASTART ((ptr_t)((((word) (etext)) + 0x1fff) & ~0x1fff)) */
953 /* This fails occasionally, due to an ancient, but very */
954 /* persistent ld bug. etext is set 32 bytes too high. */
955 /* We instead read the text segment size from the a.out */
956 /* header, which happens to be mapped into our address space */
957 /* at the start of the text segment. The detective work here */
958 /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
959 /* Serpette of INRIA. */
960 /* This assumes ZMAGIC, i.e. demand-loadable executables. */
961 # define TEXTSTART 0x2000
962 # define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
963 # define MPROTECT_VDB
965 # define DYNAMIC_LOADING
968 # define OS_TYPE "DRSNX"
969 extern ptr_t GC_SysVGetDataStart();
971 # define DATASTART GC_SysVGetDataStart(0x10000, etext)
972 # define MPROTECT_VDB
973 # define STACKBOTTOM ((ptr_t) 0xdfff0000)
974 # define DYNAMIC_LOADING
977 # define OS_TYPE "LINUX"
979 # define DYNAMIC_LOADING
981 Linux Sparc/a.out not supported
985 # define DATAEND (_end)
987 extern ptr_t GC_SysVGetDataStart();
989 # define DATASTART GC_SysVGetDataStart(0x100000, _etext)
991 # define DATASTART GC_SysVGetDataStart(0x10000, _etext)
993 # define LINUX_STACKBOTTOM
996 # define OS_TYPE "OPENBSD"
997 # define STACKBOTTOM ((ptr_t) 0xf8000000)
999 # define DATASTART ((ptr_t)(etext))
1002 # define OS_TYPE "NETBSD"
1005 # define DATASTART GC_data_start
1006 # define DYNAMIC_LOADING
1008 extern char etext[];
1009 # define DATASTART ((ptr_t)(etext))
1013 # define OS_TYPE "FREEBSD"
1014 # define SIG_SUSPEND SIGUSR1
1015 # define SIG_THR_RESTART SIGUSR2
1016 # define FREEBSD_STACKBOTTOM
1018 # define DYNAMIC_LOADING
1020 extern char etext[];
1021 extern char edata[];
1023 # define NEED_FIND_LIMIT
1024 # define DATASTART ((ptr_t)(&etext))
1025 # define DATAEND (GC_find_limit (DATASTART, TRUE))
1026 # define DATASTART2 ((ptr_t)(&edata))
1027 # define DATAEND2 ((ptr_t)(&end))
1032 # define MACH_TYPE "I386"
1033 # if defined(__LP64__) || defined(_WIN64)
1034 # define CPP_WORDSZ 64
1035 # define ALIGNMENT 8
1037 # define CPP_WORDSZ 32
1038 # define ALIGNMENT 4
1039 /* Appears to hold for all "32 bit" compilers */
1040 /* except Borland. The -a4 option fixes */
1042 /* Ivan Demakov: For Watcom the option is -zp4. */
1044 # ifndef SMALL_CONFIG
1045 # define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
1046 /* improvement on Pentiums. */
1048 # ifdef HAVE_BUILTIN_UNWIND_INIT
1049 # define USE_GENERIC_PUSH_REGS
1052 # define OS_TYPE "SEQUENT"
1054 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1055 # define STACKBOTTOM ((ptr_t) 0x3ffff000)
1058 # define OS_TYPE "BEOS"
1060 # define GETPAGESIZE() B_PAGE_SIZE
1062 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1065 # define OS_TYPE "SUNOS5"
1066 extern int _etext[], _end[];
1067 extern ptr_t GC_SysVGetDataStart();
1068 # define DATASTART GC_SysVGetDataStart(0x1000, _etext)
1069 # define DATAEND (_end)
1070 /* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
1071 /* but reportedly breaks under 2.8. It appears that the stack */
1072 /* base is a property of the executable, so this should not break */
1073 /* old executables. */
1074 /* HEURISTIC2 probably works, but this appears to be preferable. */
1075 # include <sys/vm.h>
1076 # define STACKBOTTOM USRSTACK
1077 /* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
1078 /* It appears to be fixed in 2.8 and 2.9. */
1079 # ifdef SOLARIS25_PROC_VDB_BUG_FIXED
1082 # define DYNAMIC_LOADING
1083 # if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
1085 /* Otherwise we now use calloc. Mmap may result in the */
1086 /* heap interleaved with thread stacks, which can result in */
1087 /* excessive blacklisting. Sbrk is unusable since it */
1088 /* doesn't interact correctly with the system malloc. */
1091 # define HEAP_START (ptr_t)0x40000000
1093 # define HEAP_START DATAEND
1097 # define OS_TYPE "SCO"
1099 # define DATASTART ((ptr_t)((((word) (etext)) + 0x3fffff) \
1101 +((word)etext & 0xfff))
1102 # define STACKBOTTOM ((ptr_t) 0x7ffffffc)
1105 # define OS_TYPE "SCO_ELF"
1107 # define DATASTART ((ptr_t)(etext))
1108 # define STACKBOTTOM ((ptr_t) 0x08048000)
1109 # define DYNAMIC_LOADING
1110 # define ELF_CLASS ELFCLASS32
1113 # define OS_TYPE "DGUX"
1114 extern int _etext, _end;
1115 extern ptr_t GC_SysVGetDataStart();
1116 # define DATASTART GC_SysVGetDataStart(0x1000, &_etext)
1117 # define DATAEND (&_end)
1118 # define STACK_GROWS_DOWN
1120 # include <unistd.h>
1121 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1122 # define DYNAMIC_LOADING
1125 # endif /* USE_MMAP */
1126 # define MAP_FAILED (void *) -1
1128 # define HEAP_START (ptr_t)0x40000000
1129 # else /* USE_MMAP */
1130 # define HEAP_START DATAEND
1131 # endif /* USE_MMAP */
1136 /* The Intel compiler doesn't like inline assembly */
1137 # define USE_GENERIC_PUSH_REGS
1139 # define OS_TYPE "LINUX"
1140 # define LINUX_STACKBOTTOM
1144 # define STACK_GRAN 0x10000000
1145 /* STACKBOTTOM is usually 0xc0000000, but this changes with */
1146 /* different kernel configurations. In particular, systems */
1147 /* with 2GB physical memory will usually move the user */
1148 /* address space limit, and hence initial SP to 0x80000000. */
1150 # if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
1151 # define MPROTECT_VDB
1153 /* We seem to get random errors in incremental mode, */
1154 /* possibly because Linux threads is itself a malloc client */
1155 /* and can't deal with the signals. */
1157 # define HEAP_START (ptr_t)0x1000
1158 /* This encourages mmap to give us low addresses, */
1159 /* thus allowing the heap to grow to ~3GB */
1161 # define DYNAMIC_LOADING
1162 # ifdef UNDEFINED /* includes ro data */
1163 extern int _etext[];
1164 # define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
1166 # include <features.h>
1167 # if defined(__GLIBC__) && __GLIBC__ >= 2
1168 # define SEARCH_FOR_DATA_START
1170 extern char **__environ;
1171 # define DATASTART ((ptr_t)(&__environ))
1172 /* hideous kludge: __environ is the first */
1173 /* word in crt0.o, and delimits the start */
1174 /* of the data segment, no matter which */
1175 /* ld options were passed through. */
1176 /* We could use _etext instead, but that */
1177 /* would include .rodata, which may */
1178 /* contain large read-only data tables */
1179 /* that we'd rather not scan. */
1182 # define DATAEND (_end)
1185 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1187 # ifdef USE_I686_PREFETCH
1188 /* FIXME: Thus should use __builtin_prefetch, but we'll leave that */
1189 /* for the next rtelease. */
1190 # define PREFETCH(x) \
1191 __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))
1192 /* Empirically prefetcht0 is much more effective at reducing */
1193 /* cache miss stalls for the targetted load instructions. But it */
1194 /* seems to interfere enough with other cache traffic that the net */
1195 /* result is worse than prefetchnta. */
1197 /* Using prefetches for write seems to have a slight negative */
1198 /* impact on performance, at least for a PIII/500. */
1199 # define PREFETCH_FOR_WRITE(x) \
1200 __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))
1203 # ifdef USE_3DNOW_PREFETCH
1204 # define PREFETCH(x) \
1205 __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))
1206 # define PREFETCH_FOR_WRITE(x) \
1207 __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))
1211 # define OS_TYPE "CYGWIN32"
1212 # define DATASTART ((ptr_t)GC_DATASTART) /* From gc.h */
1213 # define DATAEND ((ptr_t)GC_DATAEND)
1215 # define STACK_GRAN 0x10000
1219 # define OS_TYPE "OS2"
1220 /* STACKBOTTOM and DATASTART are handled specially in */
1221 /* os_dep.c. OS2 actually has the right */
1223 # define DATAEND /* not needed */
1224 # define USE_GENERIC_PUSH_REGS
1227 # define OS_TYPE "MSWIN32"
1228 /* STACKBOTTOM and DATASTART are handled specially in */
1230 # ifndef __WATCOMC__
1231 # define MPROTECT_VDB
1233 # define DATAEND /* not needed */
1236 # define OS_TYPE "MSWINCE"
1237 # define DATAEND /* not needed */
1240 # define OS_TYPE "DJGPP"
1241 # include "stubinfo.h"
1244 extern int __djgpp_stack_limit;
1245 # define DATASTART ((ptr_t)((((word) (etext)) + 0x1ff) & ~0x1ff))
1246 /* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
1248 # define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
1249 /* This may not be right. */
1252 # define OS_TYPE "OPENBSD"
1255 # define OS_TYPE "FREEBSD"
1256 # ifndef GC_FREEBSD_THREADS
1257 # define MPROTECT_VDB
1260 # define SIG_SUSPEND (32+6)
1261 # define SIG_THR_RESTART (32+5)
1263 # define DATAEND (_end)
1265 # define SIG_SUSPEND SIGUSR1
1266 # define SIG_THR_RESTART SIGUSR2
1268 # define FREEBSD_STACKBOTTOM
1270 # define DYNAMIC_LOADING
1272 extern char etext[];
1273 extern char * GC_FreeBSDGetDataStart();
1274 # define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
1277 # define OS_TYPE "NETBSD"
1279 # define DYNAMIC_LOADING
1283 # define OS_TYPE "THREE86BSD"
1286 # define OS_TYPE "BSDI"
1288 # if defined(OPENBSD) || defined(NETBSD) \
1289 || defined(THREE86BSD) || defined(BSDI)
1291 extern char etext[];
1292 # define DATASTART ((ptr_t)(etext))
1295 # define OS_TYPE "NEXT"
1296 # define DATASTART ((ptr_t) get_etext())
1297 # define STACKBOTTOM ((ptr_t)0xc0000000)
1298 # define DATAEND /* not needed */
1301 # define OS_TYPE "DOS4GW"
1302 extern long __nullarea;
1304 extern char *_STACKTOP;
1305 /* Depending on calling conventions Watcom C either precedes
1306 or does not precedes with undescore names of C-variables.
1307 Make sure startup code variables always have the same names. */
1308 #pragma aux __nullarea "*";
1309 #pragma aux _end "*";
1310 # define STACKBOTTOM ((ptr_t) _STACKTOP)
1311 /* confused? me too. */
1312 # define DATASTART ((ptr_t) &__nullarea)
1313 # define DATAEND ((ptr_t) &_end)
1316 # define OS_TYPE "HURD"
1317 # define STACK_GROWS_DOWN
1319 extern int __data_start[];
1320 # define DATASTART ( (ptr_t) (__data_start))
1322 # define DATAEND ( (ptr_t) (_end))
1323 /* # define MPROTECT_VDB Not quite working yet? */
1324 # define DYNAMIC_LOADING
1327 # define OS_TYPE "DARWIN"
1328 # define DARWIN_DONT_PARSE_STACK
1329 # define DYNAMIC_LOADING
1330 /* XXX: see get_end(3), get_etext() and get_end() should not be used.
1331 These aren't used when dyld support is enabled (it is by default) */
1332 # define DATASTART ((ptr_t) get_etext())
1333 # define DATAEND ((ptr_t) get_end())
1334 # define STACKBOTTOM ((ptr_t) 0xc0000000)
1336 # define USE_MMAP_ANON
1337 # define USE_ASM_PUSH_REGS
1338 /* This is potentially buggy. It needs more testing. See the comments in
1339 os_dep.c. It relies on threads to track writes. */
1340 # ifdef GC_DARWIN_THREADS
1341 /* # define MPROTECT_VDB -- disabled for now. May work for some apps. */
1343 # include <unistd.h>
1344 # define GETPAGESIZE() getpagesize()
1345 /* There seems to be some issues with trylock hanging on darwin. This
1346 should be looked into some more */
1347 # define NO_PTHREAD_TRYLOCK
1348 # endif /* DARWIN */
1352 # define MACH_TYPE "NS32K"
1353 # define ALIGNMENT 4
1354 extern char **environ;
1355 # define DATASTART ((ptr_t)(&environ))
1356 /* hideous kludge: environ is the first */
1357 /* word in crt0.o, and delimits the start */
1358 /* of the data segment, no matter which */
1359 /* ld options were passed through. */
1360 # define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
1364 # define MACH_TYPE "MIPS"
1366 /* This was developed for a linuxce style platform. Probably */
1367 /* needs to be tweaked for workstation class machines. */
1368 # define OS_TYPE "LINUX"
1369 # define DYNAMIC_LOADING
1371 # define DATAEND (_end)
1372 extern int __data_start[];
1373 # define DATASTART ((ptr_t)(__data_start))
1374 # define ALIGNMENT 4
1375 # define USE_GENERIC_PUSH_REGS
1376 # if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2 || __GLIBC__ > 2
1377 # define LINUX_STACKBOTTOM
1379 # define STACKBOTTOM 0x80000000
1384 # if defined(_MIPS_SZPTR) && (_MIPS_SZPTR == 64)
1385 extern int _fdata[], _end[];
1386 # define DATASTART ((ptr_t)_fdata)
1387 # define DATAEND ((ptr_t)_end)
1388 # define CPP_WORDSZ _MIPS_SZPTR
1389 # define ALIGNMENT (_MIPS_SZPTR/8)
1391 extern int etext[], edata[], end[];
1392 extern int _DYNAMIC_LINKING[], _gp[];
1393 # define DATASTART ((ptr_t)((((word)etext + 0x3ffff) & ~0x3ffff) \
1394 + ((word)etext & 0xffff)))
1395 # define DATAEND (edata)
1396 # define DATASTART2 (_DYNAMIC_LINKING \
1397 ? (ptr_t)(((word)_gp + 0x8000 + 0x3ffff) & ~0x3ffff) \
1399 # define DATAEND2 (end)
1400 # define ALIGNMENT 4
1402 # define OS_TYPE "EWS4800"
1403 # define USE_GENERIC_PUSH_REGS 1
1407 # define DATASTART (ptr_t)0x10000000
1408 /* Could probably be slightly higher since */
1409 /* startup code allocates lots of stuff. */
1410 # define OS_TYPE "ULTRIX"
1411 # define ALIGNMENT 4
1415 # define DATASTART (ptr_t)0x10000000
1416 # define OS_TYPE "RISCOS"
1417 # define ALIGNMENT 4 /* Required by hardware */
1421 extern int _fdata[];
1422 # define DATASTART ((ptr_t)(_fdata))
1424 # define HEAP_START (ptr_t)0x30000000
1426 # define HEAP_START DATASTART
1428 /* Lowest plausible heap address. */
1429 /* In the MMAP case, we map there. */
1430 /* In either case it is used to identify */
1431 /* heap sections so they're not */
1432 /* considered as roots. */
1433 # define OS_TYPE "IRIX5"
1434 /*# define MPROTECT_VDB DOB: this should work, but there is evidence */
1435 /* of recent breakage. */
1437 # define CPP_WORDSZ _MIPS_SZPTR
1438 # define ALIGNMENT (_MIPS_SZPTR/8)
1439 # if CPP_WORDSZ != 64
1440 # define ALIGN_DOUBLE
1443 # define ALIGNMENT 4
1444 # define ALIGN_DOUBLE
1446 # define DYNAMIC_LOADING
1449 # define OS_TYPE "MSWINCE"
1450 # define ALIGNMENT 4
1451 # define DATAEND /* not needed */
1453 # if defined(NETBSD)
1454 # define OS_TYPE "NETBSD"
1455 # define ALIGNMENT 4
1457 # define USE_GENERIC_PUSH_REGS
1460 # define DATASTART GC_data_start
1461 # define NEED_FIND_LIMIT
1462 # define DYNAMIC_LOADING
1464 # define DATASTART ((ptr_t) 0x10000000)
1465 # define STACKBOTTOM ((ptr_t) 0x7ffff000)
1468 # if defined(NONSTOP)
1469 # define CPP_WORDSZ 32
1470 # define OS_TYPE "NONSTOP"
1471 # define ALIGNMENT 4
1472 # define DATASTART ((ptr_t) 0x08000000)
1474 # define DATAEND (_end)
1475 # define STACKBOTTOM ((ptr_t) 0x4fffffff)
1476 # define USE_GENERIC_PUSH_REGS
1481 # define MACH_TYPE "RS6000"
1486 # undef IA64 /* DOB: some AIX installs stupidly define IA64 in /usr/include/sys/systemcfg.h */
1489 # define ALIGNMENT 8
1490 # define CPP_WORDSZ 64
1491 # define STACKBOTTOM ((ptr_t)0x1000000000000000)
1493 # define ALIGNMENT 4
1494 # define CPP_WORDSZ 32
1495 # define STACKBOTTOM ((ptr_t)((ulong)&errno))
1498 # define USE_MMAP_ANON
1499 /* From AIX linker man page:
1500 _text Specifies the first location of the program.
1501 _etext Specifies the first location after the program.
1502 _data Specifies the first location of the data.
1503 _edata Specifies the first location after the initialized data
1504 _end or end Specifies the first location after all data.
1506 extern int _data[], _end[];
1507 # define DATASTART ((ptr_t)((ulong)_data))
1508 # define DATAEND ((ptr_t)((ulong)_end))
1510 # define USE_GENERIC_PUSH_REGS
1511 # define DYNAMIC_LOADING
1512 /* For really old versions of AIX, this may have to be removed. */
1516 # define MACH_TYPE "HP_PA"
1518 # define CPP_WORDSZ 64
1519 # define ALIGNMENT 8
1521 # define CPP_WORDSZ 32
1522 # define ALIGNMENT 4
1523 # define ALIGN_DOUBLE
1525 # if !defined(GC_HPUX_THREADS) && !defined(GC_LINUX_THREADS)
1526 # ifndef LINUX /* For now. */
1527 # define MPROTECT_VDB
1530 # define GENERIC_COMPARE_AND_SWAP
1531 /* No compare-and-swap instruction. Use pthread mutexes */
1532 /* when we absolutely have to. */
1533 # ifdef PARALLEL_MARK
1534 # define USE_MARK_BYTES
1535 /* Minimize compare-and-swap usage. */
1538 # define STACK_GROWS_UP
1540 # define OS_TYPE "HPUX"
1541 extern int __data_start[];
1542 # define DATASTART ((ptr_t)(__data_start))
1544 /* The following appears to work for 7xx systems running HP/UX */
1545 /* 9.xx Furthermore, it might result in much faster */
1546 /* collections than HEURISTIC2, which may involve scanning */
1547 /* segments that directly precede the stack. It is not the */
1548 /* default, since it may not work on older machine/OS */
1549 /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1551 # define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1553 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1554 /* to this. Note that the GC must be initialized before the */
1555 /* first putenv call. */
1556 extern char ** environ;
1557 # define STACKBOTTOM ((ptr_t)environ)
1559 # define DYNAMIC_LOADING
1560 # include <unistd.h>
1561 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1563 # define PREFETCH(x) { \
1564 register long addr = (long)(x); \
1565 (void) _asm ("LDW", 0, 0, addr, 0); \
1570 # define OS_TYPE "LINUX"
1571 # define LINUX_STACKBOTTOM
1572 # define DYNAMIC_LOADING
1573 # define SEARCH_FOR_DATA_START
1575 # define DATAEND (&_end)
1580 # define MACH_TYPE "ALPHA"
1581 # define ALIGNMENT 8
1582 # define CPP_WORDSZ 64
1584 # define USE_GENERIC_PUSH_REGS
1585 /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1586 /* fp registers in some cases when the target is a 21264. The assembly */
1587 /* code doesn't handle that yet, and version dependencies make that a */
1588 /* bit tricky. Do the easy thing for now. */
1591 # define OS_TYPE "NETBSD"
1593 # define DATASTART GC_data_start
1594 # define ELFCLASS32 32
1595 # define ELFCLASS64 64
1596 # define ELF_CLASS ELFCLASS64
1597 # define DYNAMIC_LOADING
1600 # define OS_TYPE "OPENBSD"
1602 # ifdef __ELF__ /* since OpenBSD/Alpha 2.9 */
1603 # define DATASTART GC_data_start
1604 # define ELFCLASS32 32
1605 # define ELFCLASS64 64
1606 # define ELF_CLASS ELFCLASS64
1607 # else /* ECOFF, until OpenBSD/Alpha 2.7 */
1608 # define DATASTART ((ptr_t) 0x140000000)
1612 # define OS_TYPE "FREEBSD"
1613 /* MPROTECT_VDB is not yet supported at all on FreeBSD/alpha. */
1614 # define SIG_SUSPEND SIGUSR1
1615 # define SIG_THR_RESTART SIGUSR2
1616 # define FREEBSD_STACKBOTTOM
1618 # define DYNAMIC_LOADING
1620 /* Handle unmapped hole alpha*-*-freebsd[45]* puts between etext and edata. */
1621 extern char etext[];
1622 extern char edata[];
1624 # define NEED_FIND_LIMIT
1625 # define DATASTART ((ptr_t)(&etext))
1626 # define DATAEND (GC_find_limit (DATASTART, TRUE))
1627 # define DATASTART2 ((ptr_t)(&edata))
1628 # define DATAEND2 ((ptr_t)(&end))
1631 # define OS_TYPE "OSF1"
1632 # define DATASTART ((ptr_t) 0x140000000)
1634 # define DATAEND ((ptr_t) &_end)
1635 extern char ** environ;
1636 /* round up from the value of environ to the nearest page boundary */
1637 /* Probably breaks if putenv is called before collector */
1638 /* initialization. */
1639 # define STACKBOTTOM ((ptr_t)(((word)(environ) | (getpagesize()-1))+1))
1640 /* # define HEURISTIC2 */
1641 /* Normally HEURISTIC2 is too conervative, since */
1642 /* the text segment immediately follows the stack. */
1643 /* Hence we give an upper pound. */
1644 /* This is currently unused, since we disabled HEURISTIC2 */
1645 extern int __start[];
1646 # define HEURISTIC2_LIMIT ((ptr_t)((word)(__start) & ~(getpagesize()-1)))
1647 # ifndef GC_OSF1_THREADS
1648 /* Unresolved signal issues with threads. */
1649 # define MPROTECT_VDB
1651 # define DYNAMIC_LOADING
1654 # define OS_TYPE "LINUX"
1655 # define LINUX_STACKBOTTOM
1657 # define SEARCH_FOR_DATA_START
1658 # define DYNAMIC_LOADING
1660 # define DATASTART ((ptr_t) 0x140000000)
1663 # define DATAEND (_end)
1664 # define MPROTECT_VDB
1665 /* Has only been superficially tested. May not */
1666 /* work on all versions. */
1671 # define MACH_TYPE "IA64"
1672 # define USE_GENERIC_PUSH_REGS
1673 /* We need to get preserved registers in addition to register */
1674 /* windows. That's easiest to do with setjmp. */
1675 # ifdef PARALLEL_MARK
1676 # define USE_MARK_BYTES
1677 /* Compare-and-exchange is too expensive to use for */
1678 /* setting mark bits. */
1682 # define CPP_WORDSZ 32
1683 # define ALIGN_DOUBLE
1684 /* Requires 8 byte alignment for malloc */
1685 # define ALIGNMENT 4
1690 # define CPP_WORDSZ 64
1691 # define ALIGN_DOUBLE
1692 /* Requires 16 byte alignment for malloc */
1693 # define ALIGNMENT 8
1695 # define OS_TYPE "HPUX"
1696 extern int __data_start[];
1697 # define DATASTART ((ptr_t)(__data_start))
1698 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1699 /* to this. Note that the GC must be initialized before the */
1700 /* first putenv call. */
1701 extern char ** environ;
1702 # define STACKBOTTOM ((ptr_t)environ)
1703 # define HPUX_STACKBOTTOM
1704 # define DYNAMIC_LOADING
1705 # include <unistd.h>
1706 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1707 /* The following was empirically determined, and is probably */
1708 /* not very robust. */
1709 /* Note that the backing store base seems to be at a nice */
1710 /* address minus one page. */
1711 # define BACKING_STORE_DISPLACEMENT 0x1000000
1712 # define BACKING_STORE_ALIGNMENT 0x1000
1713 extern ptr_t GC_register_stackbottom;
1714 # define BACKING_STORE_BASE GC_register_stackbottom
1715 /* Known to be wrong for recent HP/UX versions!!! */
1718 # define CPP_WORDSZ 64
1719 # define ALIGN_DOUBLE
1720 /* Requires 16 byte alignment for malloc */
1721 # define ALIGNMENT 8
1722 # define OS_TYPE "LINUX"
1723 /* The following works on NUE and older kernels: */
1724 /* # define STACKBOTTOM ((ptr_t) 0xa000000000000000l) */
1725 /* This does not work on NUE: */
1726 # define LINUX_STACKBOTTOM
1727 /* We also need the base address of the register stack */
1728 /* backing store. This is computed in */
1729 /* GC_linux_register_stack_base based on the following */
1731 # define BACKING_STORE_ALIGNMENT 0x100000
1732 # define BACKING_STORE_DISPLACEMENT 0x80000000
1733 extern ptr_t GC_register_stackbottom;
1734 # define BACKING_STORE_BASE GC_register_stackbottom
1735 # define SEARCH_FOR_DATA_START
1737 # define DYNAMIC_LOADING
1739 /* In the Intel compiler environment, we seem to end up with */
1740 /* statically linked executables and an undefined reference */
1743 # define MPROTECT_VDB
1744 /* Requires Linux 2.3.47 or later. */
1746 # define DATAEND (_end)
1748 # ifndef __INTEL_COMPILER
1749 # define PREFETCH(x) \
1750 __asm__ (" lfetch [%0]": : "r"(x))
1751 # define PREFETCH_FOR_WRITE(x) \
1752 __asm__ (" lfetch.excl [%0]": : "r"(x))
1753 # define CLEAR_DOUBLE(x) \
1754 __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1756 # include <ia64intrin.h>
1757 # define PREFETCH(x) \
1758 __lfetch(__lfhint_none, (x))
1759 # define PREFETCH_FOR_WRITE(x) \
1760 __lfetch(__lfhint_nta, (x))
1761 # define CLEAR_DOUBLE(x) \
1762 __stf_spill((void *)(x), 0)
1763 # endif /* __INTEL_COMPILER */
1767 /* FIXME: This is a very partial guess. There is no port, yet. */
1768 # define OS_TYPE "MSWIN32"
1769 /* STACKBOTTOM and DATASTART are handled specially in */
1771 # define DATAEND /* not needed */
1772 # if defined(_WIN64)
1773 # define CPP_WORDSZ 64
1775 # define CPP_WORDSZ 32 /* Is this possible? */
1777 # define ALIGNMENT 8
1782 # define MACH_TYPE "M88K"
1783 # define ALIGNMENT 4
1784 # define ALIGN_DOUBLE
1787 # define OS_TYPE "CX_UX"
1788 # define DATASTART ((((word)etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1791 # define OS_TYPE "DGUX"
1792 extern ptr_t GC_SysVGetDataStart();
1793 # define DATASTART GC_SysVGetDataStart(0x10000, etext)
1795 # define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1799 /* If this still works, and if anyone cares, this should probably */
1800 /* be moved to the S390 category. */
1801 # define MACH_TYPE "S370"
1802 # define ALIGNMENT 4 /* Required by hardware */
1803 # define USE_GENERIC_PUSH_REGS
1805 # define OS_TYPE "UTS4"
1807 extern int _etext[];
1809 extern ptr_t GC_SysVGetDataStart();
1810 # define DATASTART GC_SysVGetDataStart(0x10000, _etext)
1811 # define DATAEND (_end)
1817 # define MACH_TYPE "S390"
1818 # define USE_GENERIC_PUSH_REGS
1820 # define ALIGNMENT 4
1821 # define CPP_WORDSZ 32
1823 # define ALIGNMENT 8
1824 # define CPP_WORDSZ 64
1827 # define HBLKSIZE 4096
1830 # define OS_TYPE "LINUX"
1831 # define LINUX_STACKBOTTOM
1832 # define DYNAMIC_LOADING
1833 extern int __data_start[];
1834 # define DATASTART ((ptr_t)(__data_start))
1836 # define DATAEND (_end)
1837 # define CACHE_LINE_SIZE 256
1838 # define GETPAGESIZE() 4096
1843 # define ALIGNMENT 4
1844 extern int _etext[];
1845 # define DATASTART ((ptr_t)(_etext))
1850 # define CPP_WORDSZ 32
1851 # define MACH_TYPE "ARM32"
1852 # define ALIGNMENT 4
1854 # define OS_TYPE "NETBSD"
1857 # define DATASTART GC_data_start
1858 # define DYNAMIC_LOADING
1860 extern char etext[];
1861 # define DATASTART ((ptr_t)(etext))
1863 # define USE_GENERIC_PUSH_REGS
1866 # define OS_TYPE "LINUX"
1867 # define LINUX_STACKBOTTOM
1869 # define STACK_GRAN 0x10000000
1870 # define USE_GENERIC_PUSH_REGS
1872 # define DYNAMIC_LOADING
1873 # include <features.h>
1874 # if defined(__GLIBC__) && __GLIBC__ >= 2
1875 # define SEARCH_FOR_DATA_START
1877 extern char **__environ;
1878 # define DATASTART ((ptr_t)(&__environ))
1879 /* hideous kludge: __environ is the first */
1880 /* word in crt0.o, and delimits the start */
1881 /* of the data segment, no matter which */
1882 /* ld options were passed through. */
1883 /* We could use _etext instead, but that */
1884 /* would include .rodata, which may */
1885 /* contain large read-only data tables */
1886 /* that we'd rather not scan. */
1889 # define DATAEND (_end)
1892 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1896 # define OS_TYPE "MSWINCE"
1897 # define DATAEND /* not needed */
1900 /* __data_start is usually defined in the target linker script. */
1901 extern int __data_start[];
1902 # define DATASTART (ptr_t)(__data_start)
1903 # define USE_GENERIC_PUSH_REGS
1904 /* __stack_base__ is set in newlib/libc/sys/arm/crt0.S */
1905 extern void *__stack_base__;
1906 # define STACKBOTTOM ((ptr_t) (__stack_base__))
1911 # define MACH_TYPE "CRIS"
1912 # define CPP_WORDSZ 32
1913 # define ALIGNMENT 1
1914 # define OS_TYPE "LINUX"
1915 # define DYNAMIC_LOADING
1916 # define LINUX_STACKBOTTOM
1917 # define USE_GENERIC_PUSH_REGS
1918 # define SEARCH_FOR_DATA_START
1920 # define DATAEND (_end)
1924 # define MACH_TYPE "SH"
1925 # define ALIGNMENT 4
1927 # define OS_TYPE "MSWINCE"
1928 # define DATAEND /* not needed */
1931 # define OS_TYPE "LINUX"
1932 # define LINUX_STACKBOTTOM
1933 # define USE_GENERIC_PUSH_REGS
1934 # define DYNAMIC_LOADING
1935 # define SEARCH_FOR_DATA_START
1937 # define DATAEND (_end)
1940 # define OS_TYPE "NETBSD"
1942 # define DATASTART GC_data_start
1943 # define USE_GENERIC_PUSH_REGS
1944 # define DYNAMIC_LOADING
1949 # define MACH_TYPE "SH4"
1950 # define OS_TYPE "MSWINCE"
1951 # define ALIGNMENT 4
1952 # define DATAEND /* not needed */
1956 # define CPP_WORDSZ 32
1957 # define MACH_TYPE "M32R"
1958 # define ALIGNMENT 4
1960 # define OS_TYPE "LINUX"
1961 # define LINUX_STACKBOTTOM
1963 # define STACK_GRAN 0x10000000
1964 # define USE_GENERIC_PUSH_REGS
1965 # define DYNAMIC_LOADING
1966 # define SEARCH_FOR_DATA_START
1968 # define DATAEND (_end)
1973 # define MACH_TYPE "X86_64"
1974 # define ALIGNMENT 8
1975 # define CPP_WORDSZ 64
1977 # define HBLKSIZE 4096
1979 # define CACHE_LINE_SIZE 64
1980 # define USE_GENERIC_PUSH_REGS
1982 # define OS_TYPE "LINUX"
1983 # define LINUX_STACKBOTTOM
1984 # if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
1985 # define MPROTECT_VDB
1987 /* We seem to get random errors in incremental mode, */
1988 /* possibly because Linux threads is itself a malloc client */
1989 /* and can't deal with the signals. */
1992 # define DYNAMIC_LOADING
1993 # ifdef UNDEFINED /* includes ro data */
1994 extern int _etext[];
1995 # define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
1997 # include <features.h>
1998 # define SEARCH_FOR_DATA_START
2000 # define DATAEND (_end)
2003 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
2005 # if defined(__GNUC__) && __GNUC >= 3
2006 # define PREFETCH(x) __builtin_prefetch((x), 0, 0)
2007 # define PREFETCH_FOR_WRITE(x) __builtin_prefetch((x), 1)
2011 # define OS_TYPE "FREEBSD"
2012 # ifndef GC_FREEBSD_THREADS
2013 # define MPROTECT_VDB
2016 # define SIG_SUSPEND (32+6)
2017 # define SIG_THR_RESTART (32+5)
2019 # define DATAEND (_end)
2021 # define SIG_SUSPEND SIGUSR1
2022 # define SIG_THR_RESTART SIGUSR2
2024 # define FREEBSD_STACKBOTTOM
2026 # define DYNAMIC_LOADING
2028 extern char etext[];
2029 extern char * GC_FreeBSDGetDataStart();
2030 # define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
2033 # define OS_TYPE "NETBSD"
2035 # define DYNAMIC_LOADING
2038 extern char etext[];
2039 # define SEARCH_FOR_DATA_START
2042 # define OS_TYPE "SOLARIS"
2043 # define ELF_CLASS ELFCLASS64
2044 extern int _etext[], _end[];
2045 extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
2046 # define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext)
2047 # define DATAEND (_end)
2048 /* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
2049 /* but reportedly breaks under 2.8. It appears that the stack */
2050 /* base is a property of the executable, so this should not break */
2051 /* old executables. */
2052 /* HEURISTIC2 probably works, but this appears to be preferable. */
2053 /* Apparently USRSTACK is defined to be USERLIMIT, but in some */
2054 /* installations that's undefined. We work around this with a */
2056 # include <sys/vmparam.h>
2058 /* This should work everywhere, but doesn't. */
2059 # define STACKBOTTOM USRSTACK
2063 /* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
2064 /* It appears to be fixed in 2.8 and 2.9. */
2065 # ifdef SOLARIS25_PROC_VDB_BUG_FIXED
2068 # define DYNAMIC_LOADING
2069 # if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
2071 /* Otherwise we now use calloc. Mmap may result in the */
2072 /* heap interleaved with thread stacks, which can result in */
2073 /* excessive blacklisting. Sbrk is unusable since it */
2074 /* doesn't interact correctly with the system malloc. */
2077 # define HEAP_START (ptr_t)0x40000000
2079 # define HEAP_START DATAEND
2084 #if defined(LINUX) && defined(USE_MMAP)
2085 /* The kernel may do a somewhat better job merging mappings etc. */
2086 /* with anonymous mappings. */
2087 # define USE_MMAP_ANON
2090 #if defined(LINUX) && defined(REDIRECT_MALLOC)
2091 /* Rld appears to allocate some memory with its own allocator, and */
2092 /* some through malloc, which might be redirected. To make this */
2093 /* work with collectable memory, we have to scan memory allocated */
2094 /* by rld's internal malloc. */
2095 # define USE_PROC_FOR_LIBRARIES
2098 # ifndef STACK_GROWS_UP
2099 # define STACK_GROWS_DOWN
2103 # define CPP_WORDSZ 32
2112 # define DATAEND (end)
2115 # if defined(SVR4) && !defined(GETPAGESIZE)
2116 # include <unistd.h>
2117 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
2120 # ifndef GETPAGESIZE
2121 # if defined(SUNOS5) || defined(IRIX5)
2122 # include <unistd.h>
2124 # define GETPAGESIZE() getpagesize()
2127 # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
2128 /* OS has SVR4 generic features. Probably others also qualify. */
2132 # if defined(SUNOS5) || defined(DRSNX)
2133 /* OS has SUNOS5 style semi-undocumented interface to dynamic */
2136 /* OS has SUNOS5 style signal handlers. */
2144 # if defined(FREEBSD) && \
2145 (defined(__DragonFly__) || __FreeBSD__ >= 4 || (__FreeBSD_kernel__ >= 4))
2149 # ifdef GC_NETBSD_THREADS
2150 # define SIGRTMIN 33
2151 # define SIGRTMAX 63
2154 # if defined(SVR4) || defined(LINUX) || defined(IRIX5) || defined(HPUX) \
2155 || defined(OPENBSD) || defined(NETBSD) || defined(FREEBSD) \
2156 || defined(DGUX) || defined(BSD) || defined(SUNOS4) \
2157 || defined(_AIX) || defined(DARWIN) || defined(OSF1)
2158 # define UNIX_LIKE /* Basic Unix-like system calls work. */
2161 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
2166 # undef DYNAMIC_LOADING
2171 # undef MPROTECT_VDB
2176 /* Postponed for now. */
2178 # undef MPROTECT_VDB
2181 # ifdef SMALL_CONFIG
2182 /* Presumably not worth the space it takes. */
2184 # undef MPROTECT_VDB
2188 # undef MPROTECT_VDB /* Can't deal with address space holes. */
2191 # ifdef PARALLEL_MARK
2192 # undef MPROTECT_VDB /* For now. */
2195 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
2196 # define DEFAULT_VDB
2200 # define PREFETCH(x)
2201 # define NO_PREFETCH
2204 # ifndef PREFETCH_FOR_WRITE
2205 # define PREFETCH_FOR_WRITE(x)
2206 # define NO_PREFETCH_FOR_WRITE
2209 # ifndef CACHE_LINE_SIZE
2210 # define CACHE_LINE_SIZE 32 /* Wild guess */
2213 # if defined(LINUX) || defined(__GLIBC__)
2214 # define REGISTER_LIBRARIES_EARLY
2215 /* We sometimes use dl_iterate_phdr, which may acquire an internal */
2216 /* lock. This isn't safe after the world has stopped. So we must */
2217 /* call GC_register_dynamic_libraries before stopping the world. */
2218 /* For performance reasons, this may be beneficial on other */
2219 /* platforms as well, though it should be avoided in win32. */
2222 # if defined(SEARCH_FOR_DATA_START)
2223 extern ptr_t GC_data_start;
2224 # define DATASTART GC_data_start
2227 # ifndef CLEAR_DOUBLE
2228 # define CLEAR_DOUBLE(x) \
2229 ((word*)x)[0] = 0; \
2231 # endif /* CLEAR_DOUBLE */
2233 /* Internally we use GC_SOLARIS_THREADS to test for either old or pthreads. */
2234 # if defined(GC_SOLARIS_PTHREADS) && !defined(GC_SOLARIS_THREADS)
2235 # define GC_SOLARIS_THREADS
2238 # if defined(GC_IRIX_THREADS) && !defined(IRIX5)
2239 --> inconsistent configuration
2241 # if defined(GC_LINUX_THREADS) && !defined(LINUX)
2242 --> inconsistent configuration
2244 # if defined(GC_NETBSD_THREADS) && !defined(NETBSD)
2245 --> inconsistent configuration
2247 # if defined(GC_SOLARIS_THREADS) && !defined(SUNOS5)
2248 --> inconsistent configuration
2250 # if defined(GC_HPUX_THREADS) && !defined(HPUX)
2251 --> inconsistent configuration
2253 # if defined(GC_AIX_THREADS) && !defined(_AIX)
2254 --> inconsistent configuration
2256 # if defined(GC_WIN32_THREADS) && !defined(MSWIN32) && !defined(CYGWIN32)
2257 --> inconsistent configuration
2260 # if defined(PCR) || defined(SRC_M3) || \
2261 defined(GC_SOLARIS_THREADS) || defined(GC_WIN32_THREADS) || \
2262 defined(GC_PTHREADS)
2266 # if defined(HP_PA) || defined(M88K) \
2267 || defined(POWERPC) && !defined(DARWIN) \
2268 || defined(LINT) || defined(MSWINCE) || defined(ARM32) || defined(CRIS) \
2269 || (defined(I386) && defined(__LCC__))
2270 /* Use setjmp based hack to mark from callee-save registers. */
2271 /* The define should move to the individual platform */
2273 # define USE_GENERIC_PUSH_REGS
2276 # if defined(MSWINCE)
2281 # define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
2282 /* include assembly code to do it well. */
2285 /* Can we save call chain in objects for debugging? */
2286 /* SET NFRAMES (# of saved frames) and NARGS (#of args for each */
2287 /* frame) to reasonable values for the platform. */
2288 /* Set SAVE_CALL_CHAIN if we can. SAVE_CALL_COUNT can be specified */
2289 /* at build time, though we feel free to adjust it slightly. */
2290 /* Define NEED_CALLINFO if we either save the call stack or */
2291 /* GC_ADD_CALLER is defined. */
2292 /* GC_CAN_SAVE_CALL_STACKS is set in gc.h. */
2295 # define CAN_SAVE_CALL_ARGS
2297 #if (defined(I386) || defined(X86_64)) && (defined(LINUX) || defined(__GLIBC__))
2298 /* SAVE_CALL_CHAIN is supported if the code is compiled to save */
2299 /* frame pointers by default, i.e. no -fomit-frame-pointer flag. */
2300 # define CAN_SAVE_CALL_ARGS
2303 # if defined(SAVE_CALL_COUNT) && !defined(GC_ADD_CALLER) \
2304 && defined(GC_CAN_SAVE_CALL_STACKS)
2305 # define SAVE_CALL_CHAIN
2307 # ifdef SAVE_CALL_CHAIN
2308 # if defined(SAVE_CALL_NARGS) && defined(CAN_SAVE_CALL_ARGS)
2309 # define NARGS SAVE_CALL_NARGS
2311 # define NARGS 0 /* Number of arguments to save for each call. */
2314 # ifdef SAVE_CALL_CHAIN
2315 # ifndef SAVE_CALL_COUNT
2316 # define NFRAMES 6 /* Number of frames to save. Even for */
2317 /* alignment reasons. */
2319 # define NFRAMES ((SAVE_CALL_COUNT + 1) & ~1)
2321 # define NEED_CALLINFO
2322 # endif /* SAVE_CALL_CHAIN */
2323 # ifdef GC_ADD_CALLER
2326 # define NEED_CALLINFO
2329 # if defined(MAKE_BACK_GRAPH) && !defined(DBG_HDRS_ALL)
2330 # define DBG_HDRS_ALL
2333 # if defined(POINTER_MASK) && !defined(POINTER_SHIFT)
2334 # define POINTER_SHIFT 0
2337 # if defined(POINTER_SHIFT) && !defined(POINTER_MASK)
2338 # define POINTER_MASK ((GC_word)(-1))
2341 # if !defined(FIXUP_POINTER) && defined(POINTER_MASK)
2342 # define FIXUP_POINTER(p) (p) = ((p) & (POINTER_MASK) << POINTER_SHIFT)
2345 # if defined(FIXUP_POINTER)
2346 # define NEED_FIXUP_POINTER 1
2348 # define NEED_FIXUP_POINTER 0
2349 # define FIXUP_POINTER(p)
2353 /* This relies on some type definitions from gc_priv.h, from */
2354 /* where it's normally included. */
2356 /* How to get heap memory from the OS: */
2357 /* Note that sbrk()-like allocation is preferred, since it */
2358 /* usually makes it possible to merge consecutively allocated */
2359 /* chunks. It also avoids unintented recursion with */
2360 /* -DREDIRECT_MALLOC. */
2361 /* GET_MEM() returns a HLKSIZE aligned chunk. */
2362 /* 0 is taken to mean failure. */
2363 /* In the case os USE_MMAP, the argument must also be a */
2364 /* physical page size. */
2365 /* GET_MEM is currently not assumed to retrieve 0 filled space, */
2366 /* though we should perhaps take advantage of the case in which */
2368 struct hblk; /* See gc_priv.h. */
2370 char * real_malloc();
2371 # define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \
2375 void * os2_alloc(size_t bytes);
2376 # define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \
2380 # if defined(NEXT) || defined(DOS4GW) || defined(NONSTOP) || \
2381 (defined(AMIGA) && !defined(GC_AMIGA_FASTALLOC)) || \
2382 (defined(SUNOS5) && !defined(USE_MMAP))
2383 # define GET_MEM(bytes) HBLKPTR((size_t) \
2384 calloc(1, (size_t)bytes + GC_page_size) \
2388 extern ptr_t GC_win32_get_mem();
2389 # define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes)
2392 # if defined(USE_TEMPORARY_MEMORY)
2393 extern Ptr GC_MacTemporaryNewPtr(size_t size,
2394 Boolean clearMemory);
2395 # define GET_MEM(bytes) HBLKPTR( \
2396 GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \
2399 # define GET_MEM(bytes) HBLKPTR( \
2400 NewPtrClear(bytes + GC_page_size) + GC_page_size-1)
2404 extern ptr_t GC_wince_get_mem();
2405 # define GET_MEM(bytes) (struct hblk *)GC_wince_get_mem(bytes)
2407 # if defined(AMIGA) && defined(GC_AMIGA_FASTALLOC)
2408 extern void *GC_amiga_get_mem(size_t size);
2409 # define GET_MEM(bytes) HBLKPTR((size_t) \
2410 GC_amiga_get_mem((size_t)bytes + GC_page_size) \
2413 extern ptr_t GC_unix_get_mem();
2414 # define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes)
2423 #endif /* GC_PRIVATE_H */
2425 #if defined(_AIX) && !defined(__GNUC__) && !defined(__STDC__)
2426 /* IBMs xlc compiler doesn't appear to follow the convention of */
2427 /* defining __STDC__ to be zero in extended mode. */
2431 # endif /* GCCONFIG_H */