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guile/guile-core/libguile gc_os_dep.c
|
From: |
Marius Vollmer |
|
Subject: |
guile/guile-core/libguile gc_os_dep.c |
|
Date: |
Wed, 11 Oct 2000 12:23:52 -0700 |
CVSROOT: /cvs
Module name: guile
Changes by: Marius Vollmer <address@hidden> 00/10/11 12:23:52
Modified files:
guile-core/libguile: gc_os_dep.c
Log message:
* gc_os_dep.c: Added real implementation based on code from Boehms
collector. This is not well tested yet.
CVSWeb URLs:
http://subversions.gnu.org/cgi-bin/cvsweb/guile/guile-core/libguile/gc_os_dep.c.diff?r1=1.1&r2=1.2
Patches:
Index: guile/guile-core/libguile/gc_os_dep.c
diff -u guile/guile-core/libguile/gc_os_dep.c:1.1
guile/guile-core/libguile/gc_os_dep.c:1.2
--- guile/guile-core/libguile/gc_os_dep.c:1.1 Sun Sep 3 13:27:17 2000
+++ guile/guile-core/libguile/gc_os_dep.c Wed Oct 11 12:23:52 2000
@@ -1,10 +1,1838 @@
-/* This is a dummy file. It will be replaced with the real thing when
- all copyright issues have been settled. */
+/*
+ * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
+ * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
+ * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
+ * Copyright (c) 2000 Free Software Foundation
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ */
-#include <stddef.h>
+/*
+ * Copied from gc5.2, files "os_dep.c", "gc_priv.h"and "gcconfig.h",
+ * and modified for Guile by Marius Vollmer.
+ */
-void *
-scm_get_stack_base ()
+#include <ctype.h>
+#include "libguile/gc.h"
+
+#define ABORT(msg) abort ()
+
+typedef char * ptr_t; /* A generic pointer to which we can add */
+ /* byte displacements. */
+ /* Preferably identical to caddr_t, if it */
+ /* exists. */
+
+/* Define word and signed_word to be unsigned and signed types of the */
+/* size as char * or void *. There seems to be no way to do this */
+/* even semi-portably. The following is probably no better/worse */
+/* than almost anything else. */
+/* The ANSI standard suggests that size_t and ptr_diff_t might be */
+/* better choices. But those appear to have incorrect definitions */
+/* on may systems. Notably "typedef int size_t" seems to be both */
+/* frequent and WRONG. */
+typedef unsigned long GC_word;
+typedef long GC_signed_word;
+
+typedef GC_word word;
+typedef GC_signed_word signed_word;
+
+/* Machine dependent parameters. Some tuning parameters can be found */
+/* near the top of gc_private.h. */
+
+/* Machine specific parts contributed by various people. See README file. */
+
+/* First a unified test for Linux: */
+# if defined(linux) || defined(__linux__)
+# define LINUX
+# endif
+
+/* Determine the machine type: */
+# if defined(sun) && defined(mc68000)
+# define M68K
+# define SUNOS4
+# define mach_type_known
+# endif
+# if defined(hp9000s300)
+# define M68K
+# define HP
+# define mach_type_known
+# endif
+# if defined(__OpenBSD__) && defined(m68k)
+# define M68K
+# define OPENBSD
+# define mach_type_known
+# endif
+# if defined(__OpenBSD__) && defined(__sparc__)
+# define SPARC
+# define OPENBSD
+# define mach_type_known
+# endif
+# if defined(__NetBSD__) && defined(m68k)
+# define M68K
+# define NETBSD
+# define mach_type_known
+# endif
+# if defined(__NetBSD__) && defined(arm32)
+# define ARM32
+# define NETBSD
+# define mach_type_known
+# endif
+# if defined(vax)
+# define VAX
+# ifdef ultrix
+# define ULTRIX
+# else
+# define BSD
+# endif
+# define mach_type_known
+# endif
+# if defined(mips) || defined(__mips)
+# define MIPS
+# if !defined(LINUX)
+# if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)
+# define ULTRIX
+# else
+# if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \
+ || defined(__SYSTYPE_SVR4__)
+# define IRIX5 /* or IRIX 6.X */
+# else
+# define RISCOS /* or IRIX 4.X */
+# endif
+# endif
+# endif /* !LINUX */
+# define mach_type_known
+# endif
+# if defined(sequent) && defined(i386)
+# define I386
+# define SEQUENT
+# define mach_type_known
+# endif
+# if defined(sun) && defined(i386)
+# define I386
+# define SUNOS5
+# define mach_type_known
+# endif
+# if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
+# define I386
+# define OS2
+# define mach_type_known
+# endif
+# if defined(ibm032)
+# define RT
+# define mach_type_known
+# endif
+# if defined(sun) && (defined(sparc) || defined(__sparc))
+# define SPARC
+ /* Test for SunOS 5.x */
+# include <errno.h>
+# ifdef ECHRNG
+# define SUNOS5
+# else
+# define SUNOS4
+# endif
+# define mach_type_known
+# endif
+# if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
+ && !defined(__OpenBSD__)
+# define SPARC
+# define DRSNX
+# define mach_type_known
+# endif
+# if defined(_IBMR2)
+# define RS6000
+# define mach_type_known
+# endif
+# if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
+ /* The above test may need refinement */
+# define I386
+# if defined(_SCO_ELF)
+# define SCO_ELF
+# else
+# define SCO
+# endif
+# define mach_type_known
+# endif
+# if defined(_AUX_SOURCE)
+# define M68K
+# define SYSV
+# define mach_type_known
+# endif
+# if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
+ || defined(hppa) || defined(__hppa__)
+# define HP_PA
+# ifndef LINUX
+# define HPUX
+# endif
+# define mach_type_known
+# endif
+# if defined(LINUX) && (defined(i386) || defined(__i386__))
+# define I386
+# define mach_type_known
+# endif
+# if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
+# define IA64
+# define mach_type_known
+# endif
+# if defined(LINUX) && defined(powerpc)
+# define POWERPC
+# define mach_type_known
+# endif
+# if defined(LINUX) && defined(__mc68000__)
+# define M68K
+# define mach_type_known
+# endif
+# if defined(LINUX) && (defined(sparc) || defined(__sparc__))
+# define SPARC
+# define mach_type_known
+# endif
+# if defined(LINUX) && defined(arm)
+# define ARM32
+# define mach_type_known
+# endif
+# if defined(__alpha) || defined(__alpha__)
+# define ALPHA
+# if !defined(LINUX)
+# define OSF1 /* a.k.a Digital Unix */
+# endif
+# define mach_type_known
+# endif
+# if defined(_AMIGA) && !defined(AMIGA)
+# define AMIGA
+# endif
+# ifdef AMIGA
+# define M68K
+# define mach_type_known
+# endif
+# if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
+# define M68K
+# define MACOS
+# define mach_type_known
+# endif
+# if defined(__MWERKS__) && defined(__powerc)
+# define POWERPC
+# define MACOS
+# define mach_type_known
+# endif
+# if defined(macosx)
+# define MACOSX
+# define POWERPC
+# define mach_type_known
+# endif
+# if defined(NeXT) && defined(mc68000)
+# define M68K
+# define NEXT
+# define mach_type_known
+# endif
+# if defined(NeXT) && defined(i386)
+# define I386
+# define NEXT
+# define mach_type_known
+# endif
+# if defined(__OpenBSD__) && defined(i386)
+# define I386
+# define OPENBSD
+# define mach_type_known
+# endif
+# if defined(__FreeBSD__) && defined(i386)
+# define I386
+# define FREEBSD
+# define mach_type_known
+# endif
+# if defined(__NetBSD__) && defined(i386)
+# define I386
+# define NETBSD
+# define mach_type_known
+# endif
+# if defined(bsdi) && defined(i386)
+# define I386
+# define BSDI
+# define mach_type_known
+# endif
+# if !defined(mach_type_known) && defined(__386BSD__)
+# define I386
+# define THREE86BSD
+# define mach_type_known
+# endif
+# if defined(_CX_UX) && defined(_M88K)
+# define M88K
+# define CX_UX
+# define mach_type_known
+# endif
+# if defined(DGUX)
+# define M88K
+ /* DGUX defined */
+# define mach_type_known
+# endif
+# if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
+ || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
+# define I386
+# define MSWIN32 /* or Win32s */
+# define mach_type_known
+# endif
+# if defined(__DJGPP__)
+# define I386
+# ifndef DJGPP
+# define DJGPP /* MSDOS running the DJGPP port of GCC */
+# endif
+# define mach_type_known
+# endif
+# if defined(__CYGWIN32__) || defined(__CYGWIN__)
+# define I386
+# define CYGWIN32
+# define mach_type_known
+# endif
+# if defined(__MINGW32__)
+# define I386
+# define MSWIN32
+# define mach_type_known
+# endif
+# if defined(__BORLANDC__)
+# define I386
+# define MSWIN32
+# define mach_type_known
+# endif
+# if defined(_UTS) && !defined(mach_type_known)
+# define S370
+# define UTS4
+# define mach_type_known
+# endif
+# if defined(__pj__)
+# define PJ
+# define mach_type_known
+# endif
+/* Ivan Demakov */
+# if defined(__WATCOMC__) && defined(__386__)
+# define I386
+# if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
+# if defined(__OS2__)
+# define OS2
+# else
+# if defined(__WINDOWS_386__) || defined(__NT__)
+# define MSWIN32
+# else
+# define DOS4GW
+# endif
+# endif
+# endif
+# define mach_type_known
+# endif
+
+/* Feel free to add more clauses here */
+
+/* Or manually define the machine type here. A machine type is */
+/* characterized by the architecture. Some */
+/* machine types are further subdivided by OS. */
+/* the macros ULTRIX, RISCOS, and BSD to distinguish. */
+/* Note that SGI IRIX is treated identically to RISCOS.
*/
+/* SYSV on an M68K actually means A/UX.
*/
+/* The distinction in these cases is usually the stack starting address */
+# ifndef mach_type_known
+ --> unknown machine type
+# endif
+ /* Mapping is: M68K ==> Motorola 680X0 */
+ /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
+ /* MACOS and AMIGA variants) */
+ /* I386 ==> Intel 386 */
+ /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
+ /* FREEBSD, THREE86BSD, MSWIN32, */
+ /* BSDI,SUNOS5, NEXT, other variants) */
+ /* NS32K ==> Encore Multimax */
+ /* MIPS ==> R2000 or R3000 */
+ /* (RISCOS, ULTRIX variants) */
+ /* VAX ==> DEC VAX */
+ /* (BSD, ULTRIX variants) */
+ /* RS6000 ==> IBM RS/6000 AIX3.X */
+ /* RT ==> IBM PC/RT */
+ /* HP_PA ==> HP9000/700 & /800 */
+ /* HP/UX */
+ /* SPARC ==> SPARC under SunOS */
+ /* (SUNOS4, SUNOS5, */
+ /* DRSNX variants) */
+ /* ALPHA ==> DEC Alpha */
+ /* (OSF1 and LINUX variants) */
+ /* M88K ==> Motorola 88XX0 */
+ /* (CX_UX and DGUX) */
+ /* S370 ==> 370-like machine */
+ /* running Amdahl UTS4 */
+ /* ARM32 ==> Intel StrongARM */
+ /* IA64 ==> Intel IA64 */
+ /* (e.g. Itanium) */
+
+
+/*
+ * For each architecture and OS, the following need to be defined:
+ *
+ * CPP_WORD_SZ is a simple integer constant representing the word size.
+ * in bits. We assume byte addressibility, where a byte has 8 bits.
+ * We also assume CPP_WORD_SZ is either 32 or 64.
+ * (We care about the length of pointers, not hardware
+ * bus widths. Thus a 64 bit processor with a C compiler that uses
+ * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
+ *
+ * MACH_TYPE is a string representation of the machine type.
+ * OS_TYPE is analogous for the OS.
+ *
+ * ALIGNMENT is the largest N, such that
+ * all pointer are guaranteed to be aligned on N byte boundaries.
+ * defining it to be 1 will always work, but perform poorly.
+ *
+ * DATASTART is the beginning of the data segment.
+ * On UNIX systems, the collector will scan the area between DATASTART
+ * and DATAEND for root pointers.
+ *
+ * DATAEND, if not &end.
+ *
+ * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
+ * the pointer size.
+ *
+ * STACKBOTTOM is the cool end of the stack, which is usually the
+ * highest address in the stack.
+ * Under PCR or OS/2, we have other ways of finding thread stacks.
+ * For each machine, the following should:
+ * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
+ * 2) define exactly one of
+ * STACKBOTTOM (should be defined to be an expression)
+ * HEURISTIC1
+ * HEURISTIC2
+ * If either of the last two macros are defined, then STACKBOTTOM is computed
+ * during collector startup using one of the following two heuristics:
+ * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
+ * the next multiple of STACK_GRAN.
+ * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
+ * in small steps (decrement if STACK_GROWS_UP), and read the value
+ * at each location. Remember the value when the first
+ * Segmentation violation or Bus error is signalled. Round that
+ * to the nearest plausible page boundary, and use that instead
+ * of STACKBOTTOM.
+ *
+ * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
+ * the value of environ is a pointer that can serve as STACKBOTTOM.
+ * I expect that HEURISTIC2 can be replaced by this approach, which
+ * interferes far less with debugging.
+ *
+ * If no expression for STACKBOTTOM can be found, and neither of the above
+ * heuristics are usable, the collector can still be used with all of the above
+ * undefined, provided one of the following is done:
+ * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
+ * without reference to STACKBOTTOM. This is appropriate for use in
+ * conjunction with thread packages, since there will be multiple stacks.
+ * (Allocating thread stacks in the heap, and treating them as ordinary
+ * heap data objects is also possible as a last resort. However, this is
+ * likely to introduce significant amounts of excess storage retention
+ * unless the dead parts of the thread stacks are periodically cleared.)
+ * 2) Client code may set GC_stackbottom before calling any GC_ routines.
+ * If the author of the client code controls the main program, this is
+ * easily accomplished by introducing a new main program, setting
+ * GC_stackbottom to the address of a local variable, and then calling
+ * the original main program. The new main program would read something
+ * like:
+ *
+ * # include "gc_private.h"
+ *
+ * main(argc, argv, envp)
+ * int argc;
+ * char **argv, **envp;
+ * {
+ * int dummy;
+ *
+ * GC_stackbottom = (ptr_t)(&dummy);
+ * return(real_main(argc, argv, envp));
+ * }
+ *
+ *
+ * Each architecture may also define the style of virtual dirty bit
+ * implementation to be used:
+ * MPROTECT_VDB: Write protect the heap and catch faults.
+ * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
+ *
+ * An architecture may define DYNAMIC_LOADING if dynamic_load.c
+ * defined GC_register_dynamic_libraries() for the architecture.
+ *
+ * An architecture may define PREFETCH(x) to preload the cache with *x.
+ * This defaults to a no-op.
+ *
+ * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
+ *
+ * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
+ * clear the two words at GC_malloc-aligned address x. By default,
+ * word stores of 0 are used instead.
+ */
+
+
+# define STACK_GRAN 0x1000000
+# ifdef M68K
+# define MACH_TYPE "M68K"
+# define ALIGNMENT 2
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# define HEURISTIC2
+ extern char etext;
+# define DATASTART ((ptr_t)(&etext))
+# endif
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# define HEURISTIC2
+ extern char etext;
+# define DATASTART ((ptr_t)(&etext))
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define STACKBOTTOM ((ptr_t)0xf0000000)
+# define MPROTECT_VDB
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+ extern char **__environ;
+# define DATASTART ((ptr_t)(&__environ))
+ /* hideous kludge: __environ is the first */
+ /* word in crt0.o, and delimits the start */
+ /* of the data segment, no matter which */
+ /* ld options were passed through. */
+ /* We could use _etext instead, but that */
+ /* would include .rodata, which may */
+ /* contain large read-only data tables */
+ /* that we'd rather not scan. */
+ extern int _end;
+# define DATAEND (&_end)
+# else
+ extern int etext;
+# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
+# endif
+# endif
+# ifdef SUNOS4
+# define OS_TYPE "SUNOS4"
+ extern char etext;
+# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
+# define HEURISTIC1 /* differs */
+# define DYNAMIC_LOADING
+# endif
+# ifdef HP
+# define OS_TYPE "HP"
+ extern char etext;
+# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
+# define STACKBOTTOM ((ptr_t) 0xffeffffc)
+ /* empirically determined. seems to work. */
+# include <unistd.h>
+# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
+# endif
+# ifdef SYSV
+# define OS_TYPE "SYSV"
+ extern etext;
+# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
+ & ~0x3fffff) \
+ +((word)&etext & 0x1fff))
+ /* This only works for shared-text binaries with magic number 0413.
+ The other sorts of SysV binaries put the data at the end of the text,
+ in which case the default of &etext would work. Unfortunately,
+ handling both would require having the magic-number available.
+ -- Parag
+ */
+# define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
+ /* The stack starts at the top of memory, but */
+ /* 0x0 cannot be used as setjump_test complains */
+ /* that the stack direction is incorrect. Two */
+ /* bytes down from 0x0 should be safe enough. */
+ /* --Parag */
+# include <sys/mmu.h>
+# define GETPAGESIZE() PAGESIZE /* Is this still right? */
+# endif
+# ifdef AMIGA
+# define OS_TYPE "AMIGA"
+ /* STACKBOTTOM and DATASTART handled specially */
+ /* in os_dep.c */
+# define DATAEND /* not needed */
+# define GETPAGESIZE() 4096
+# endif
+# ifdef MACOS
+# ifndef __LOWMEM__
+# include <LowMem.h>
+# endif
+# define OS_TYPE "MACOS"
+ /* see os_dep.c for details of global data segments. */
+# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
+# define DATAEND /* not needed */
+# define GETPAGESIZE() 4096
+# endif
+# ifdef NEXT
+# define OS_TYPE "NEXT"
+# define DATASTART ((ptr_t) get_etext())
+# define STACKBOTTOM ((ptr_t) 0x4000000)
+# define DATAEND /* not needed */
+# endif
+# endif
+
+# ifdef POWERPC
+# define MACH_TYPE "POWERPC"
+# ifdef MACOS
+# define ALIGNMENT 2 /* Still necessary? Could it be 4? */
+# ifndef __LOWMEM__
+# include <LowMem.h>
+# endif
+# define OS_TYPE "MACOS"
+ /* see os_dep.c for details of global data segments. */
+# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
+# define DATAEND /* not needed */
+# endif
+# ifdef LINUX
+# define ALIGNMENT 4 /* Guess. Can someone verify? */
+ /* This was 2, but that didn't sound right. */
+# define OS_TYPE "LINUX"
+# define HEURISTIC1
+# define DYNAMIC_LOADING
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000000
+ /* Stack usually starts at 0x80000000 */
+# define LINUX_DATA_START
+ extern int _end;
+# define DATAEND (&_end)
+# endif
+# ifdef MACOSX
+# define ALIGNMENT 4
+# define OS_TYPE "MACOSX"
+# define DATASTART ((ptr_t) get_etext())
+# define STACKBOTTOM ((ptr_t) 0xc0000000)
+# define DATAEND /* not needed */
+# endif
+# endif
+
+# ifdef VAX
+# define MACH_TYPE "VAX"
+# define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
+ extern char etext;
+# define DATASTART ((ptr_t)(&etext))
+# ifdef BSD
+# define OS_TYPE "BSD"
+# define HEURISTIC1
+ /* HEURISTIC2 may be OK, but it's hard to test. */
+# endif
+# ifdef ULTRIX
+# define OS_TYPE "ULTRIX"
+# define STACKBOTTOM ((ptr_t) 0x7fffc800)
+# endif
+# endif
+
+# ifdef RT
+# define MACH_TYPE "RT"
+# define ALIGNMENT 4
+# define DATASTART ((ptr_t) 0x10000000)
+# define STACKBOTTOM ((ptr_t) 0x1fffd800)
+# endif
+
+# ifdef SPARC
+# define MACH_TYPE "SPARC"
+# define ALIGNMENT 4 /* Required by hardware */
+# define ALIGN_DOUBLE
+ extern int etext;
+# ifdef SUNOS5
+# define OS_TYPE "SUNOS5"
+ extern int _etext;
+ extern int _end;
+ extern char * GC_SysVGetDataStart();
+# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
+# define DATAEND (&_end)
+# ifndef USE_MMAP
+# define USE_MMAP
+# endif
+# ifdef USE_MMAP
+# define HEAP_START (ptr_t)0x40000000
+# else
+# define HEAP_START DATAEND
+# endif
+# define PROC_VDB
+/* HEURISTIC1 reportedly no longer works under 2.7. Thus we */
+/* switched to HEURISTIC2, eventhough it creates some debugging */
+/* issues. */
+# define HEURISTIC2
+# include <unistd.h>
+# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
+ /* getpagesize() appeared to be missing from at least one */
+ /* Solaris 5.4 installation. Weird. */
+# define DYNAMIC_LOADING
+# endif
+# ifdef SUNOS4
+# define OS_TYPE "SUNOS4"
+ /* [If you have a weak stomach, don't read this.] */
+ /* We would like to use: */
+/* # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff))
*/
+ /* This fails occasionally, due to an ancient, but very */
+ /* persistent ld bug. &etext is set 32 bytes too high. */
+ /* We instead read the text segment size from the a.out */
+ /* header, which happens to be mapped into our address space */
+ /* at the start of the text segment. The detective work here */
+ /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
+ /* Serpette of INRIA. */
+ /* This assumes ZMAGIC, i.e. demand-loadable executables. */
+# define TEXTSTART 0x2000
+# define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
+# define MPROTECT_VDB
+# define HEURISTIC1
+# define DYNAMIC_LOADING
+# endif
+# ifdef DRSNX
+# define CPP_WORDSZ 32
+# define OS_TYPE "DRSNX"
+ extern char * GC_SysVGetDataStart();
+ extern int etext;
+# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
+# define MPROTECT_VDB
+# define STACKBOTTOM ((ptr_t) 0xdfff0000)
+# define DYNAMIC_LOADING
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# ifdef __ELF__
+# define LINUX_DATA_START
+# define DYNAMIC_LOADING
+# else
+ Linux Sparc non elf ?
+# endif
+ extern int _end;
+# define DATAEND (&_end)
+# define SVR4
+# define STACKBOTTOM ((ptr_t) 0xf0000000)
+# endif
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# define STACKBOTTOM ((ptr_t) 0xf8000000)
+# define DATASTART ((ptr_t)(&etext))
+# endif
+# endif
+
+# ifdef I386
+# define MACH_TYPE "I386"
+# define ALIGNMENT 4 /* Appears to hold for all "32 bit" compilers */
+ /* except Borland. The -a4 option fixes */
+ /* Borland. */
+ /* Ivan Demakov: For Watcom the option is -zp4. */
+# ifndef SMALL_CONFIG
+# define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
+ /* improvement on Pentiums. */
+# endif
+# ifdef SEQUENT
+# define OS_TYPE "SEQUENT"
+ extern int etext;
+# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
+# define STACKBOTTOM ((ptr_t) 0x3ffff000)
+# endif
+# ifdef SUNOS5
+# define OS_TYPE "SUNOS5"
+ extern int etext, _start;
+ extern char * GC_SysVGetDataStart();
+# define DATASTART GC_SysVGetDataStart(0x1000, &etext)
+# define STACKBOTTOM ((ptr_t)(&_start))
+/** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
+/*# define PROC_VDB*/
+# define DYNAMIC_LOADING
+# ifndef USE_MMAP
+# define USE_MMAP
+# endif
+# ifdef USE_MMAP
+# define HEAP_START (ptr_t)0x40000000
+# else
+# define HEAP_START DATAEND
+# endif
+# endif
+# ifdef SCO
+# define OS_TYPE "SCO"
+ extern int etext;
+# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
+ & ~0x3fffff) \
+ +((word)&etext & 0xfff))
+# define STACKBOTTOM ((ptr_t) 0x7ffffffc)
+# endif
+# ifdef SCO_ELF
+# define OS_TYPE "SCO_ELF"
+ extern int etext;
+# define DATASTART ((ptr_t)(&etext))
+# define STACKBOTTOM ((ptr_t) 0x08048000)
+# define DYNAMIC_LOADING
+# define ELF_CLASS ELFCLASS32
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define LINUX_STACKBOTTOM
+# if 0
+# define HEURISTIC1
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000000
+ /* STACKBOTTOM is usually 0xc0000000, but this changes with */
+ /* different kernel configurations. In particular, systems */
+ /* with 2GB physical memory will usually move the user */
+ /* address space limit, and hence initial SP to 0x80000000. */
+# endif
+# if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
+# define MPROTECT_VDB
+# else
+ /* We seem to get random errors in incremental mode, */
+ /* possibly because Linux threads is itself a malloc client */
+ /* and can't deal with the signals. */
+# endif
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# ifdef UNDEFINED /* includes ro data */
+ extern int _etext;
+# define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) &
~0xfff))
+# endif
+# include <features.h>
+# if defined(__GLIBC__) && __GLIBC__ >= 2
+# define LINUX_DATA_START
+# else
+ extern char **__environ;
+# define DATASTART ((ptr_t)(&__environ))
+ /* hideous kludge: __environ is the first */
+ /* word in crt0.o, and delimits the start */
+ /* of the data segment, no matter which */
+ /* ld options were passed through. */
+ /* We could use _etext instead, but that */
+ /* would include .rodata, which may */
+ /* contain large read-only data tables */
+ /* that we'd rather not scan. */
+# endif
+ extern int _end;
+# define DATAEND (&_end)
+# else
+ extern int etext;
+# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
+# endif
+# ifdef USE_I686_PREFETCH
+# define PREFETCH(x) \
+ __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char
*)(x)))
+ /* Empirically prefetcht0 is much more effective at reducing
*/
+ /* cache miss stalls for the targetted load instructions. But it
*/
+ /* seems to interfere enough with other cache traffic that the net
*/
+ /* result is worse than prefetchnta.
*/
+# if 0
+ /* Using prefetches for write seems to have a slight negative
*/
+ /* impact on performance, at least for a PIII/500.
*/
+# define PREFETCH_FOR_WRITE(x) \
+ __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char
*)(x)))
+# endif
+# endif
+# ifdef USE_3DNOW_PREFETCH
+# define PREFETCH(x) \
+ __asm__ __volatile__ (" prefetch %0": : "m"(*(char
*)(x)))
+# define PREFETCH_FOR_WRITE(x)
+ __asm__ __volatile__ (" prefetchw %0": : "m"(*(char
*)(x)))
+# endif
+# endif
+# ifdef CYGWIN32
+# define OS_TYPE "CYGWIN32"
+ extern int _data_start__;
+ extern int _data_end__;
+ extern int _bss_start__;
+ extern int _bss_end__;
+ /* For binutils 2.9.1, we have */
+ /* DATASTART = _data_start__ */
+ /* DATAEND = _bss_end__ */
+ /* whereas for some earlier versions it was */
+ /* DATASTART = _bss_start__ */
+ /* DATAEND = _data_end__ */
+ /* To get it right for both, we take the */
+ /* minumum/maximum of the two. */
+# define MAX(x,y) ((x) > (y) ? (x) : (y))
+# define MIN(x,y) ((x) < (y) ? (x) : (y))
+# define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
+# define DATAEND ((ptr_t) MAX(&_data_end__, &_bss_end__))
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000
+# define HEURISTIC1
+# endif
+# ifdef OS2
+# define OS_TYPE "OS2"
+ /* STACKBOTTOM and DATASTART are handled specially in */
+ /* os_dep.c. OS2 actually has the right */
+ /* system call! */
+# define DATAEND /* not needed */
+# endif
+# ifdef MSWIN32
+# define OS_TYPE "MSWIN32"
+ /* STACKBOTTOM and DATASTART are handled specially in */
+ /* os_dep.c. */
+# ifndef __WATCOMC__
+# define MPROTECT_VDB
+# endif
+# define DATAEND /* not needed */
+# endif
+# ifdef DJGPP
+# define OS_TYPE "DJGPP"
+# include "stubinfo.h"
+ extern int etext;
+ extern int _stklen;
+ extern int __djgpp_stack_limit;
+# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
+/* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
+ + _stklen)) */
+# define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
+ /* This may not be right. */
+# endif
+# ifdef OPENBSD
+# define OS_TYPE "OPENBSD"
+# endif
+# ifdef FREEBSD
+# define OS_TYPE "FREEBSD"
+# define MPROTECT_VDB
+# endif
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# endif
+# ifdef THREE86BSD
+# define OS_TYPE "THREE86BSD"
+# endif
+# ifdef BSDI
+# define OS_TYPE "BSDI"
+# endif
+# if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
+ || defined(THREE86BSD) || defined(BSDI)
+# define HEURISTIC2
+ extern char etext;
+# define DATASTART ((ptr_t)(&etext))
+# endif
+# ifdef NEXT
+# define OS_TYPE "NEXT"
+# define DATASTART ((ptr_t) get_etext())
+# define STACKBOTTOM ((ptr_t)0xc0000000)
+# define DATAEND /* not needed */
+# endif
+# ifdef DOS4GW
+# define OS_TYPE "DOS4GW"
+ extern long __nullarea;
+ extern char _end;
+ extern char *_STACKTOP;
+ /* Depending on calling conventions Watcom C either precedes
+ or does not precedes with undescore names of C-variables.
+ Make sure startup code variables always have the same names. */
+ #pragma aux __nullarea "*";
+ #pragma aux _end "*";
+# define STACKBOTTOM ((ptr_t) _STACKTOP)
+ /* confused? me too. */
+# define DATASTART ((ptr_t) &__nullarea)
+# define DATAEND ((ptr_t) &_end)
+# endif
+# endif
+
+# ifdef NS32K
+# define MACH_TYPE "NS32K"
+# define ALIGNMENT 4
+ extern char **environ;
+# define DATASTART ((ptr_t)(&environ))
+ /* hideous kludge: environ is the first */
+ /* word in crt0.o, and delimits the start */
+ /* of the data segment, no matter which */
+ /* ld options were passed through. */
+# define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
+# endif
+
+# ifdef MIPS
+# define MACH_TYPE "MIPS"
+/* # define STACKBOTTOM ((ptr_t)0x7fff8000) sometimes also works. */
+# ifdef LINUX
+ /* This was developed for a linuxce style platform. Probably */
+ /* needs to be tweaked for workstation class machines. */
+# define OS_TYPE "LINUX"
+ extern int __data_start;
+# define DATASTART ((ptr_t)(&__data_start))
+# define ALIGNMENT 4
+# define USE_GENERIC_PUSH_REGS 1
+# define STACKBOTTOM 0x80000000
+ /* In many cases, this should probably use LINUX_STACKBOTTOM */
+ /* instead. But some kernel versions seem to give the wrong */
+ /* value from /proc. */
+# endif /* Linux */
+# ifdef ULTRIX
+# define HEURISTIC2
+# define DATASTART (ptr_t)0x10000000
+ /* Could probably be slightly higher since */
+ /* startup code allocates lots of stuff. */
+# define OS_TYPE "ULTRIX"
+# define ALIGNMENT 4
+# endif
+# ifdef RISCOS
+# define HEURISTIC2
+# define DATASTART (ptr_t)0x10000000
+# define OS_TYPE "RISCOS"
+# define ALIGNMENT 4 /* Required by hardware */
+# endif
+# ifdef IRIX5
+# define HEURISTIC2
+ extern int _fdata;
+# define DATASTART ((ptr_t)(&_fdata))
+# ifdef USE_MMAP
+# define HEAP_START (ptr_t)0x30000000
+# else
+# define HEAP_START DATASTART
+# endif
+ /* Lowest plausible heap address. */
+ /* In the MMAP case, we map there. */
+ /* In either case it is used to identify */
+ /* heap sections so they're not */
+ /* considered as roots. */
+# define OS_TYPE "IRIX5"
+# define MPROTECT_VDB
+# ifdef _MIPS_SZPTR
+# define CPP_WORDSZ _MIPS_SZPTR
+# define ALIGNMENT (_MIPS_SZPTR/8)
+# if CPP_WORDSZ != 64
+# define ALIGN_DOUBLE
+# endif
+# else
+# define ALIGNMENT 4
+# define ALIGN_DOUBLE
+# endif
+# define DYNAMIC_LOADING
+# endif
+# endif
+
+# ifdef RS6000
+# define MACH_TYPE "RS6000"
+# define ALIGNMENT 4
+# define DATASTART ((ptr_t)0x20000000)
+ extern int errno;
+# define STACKBOTTOM ((ptr_t)((ulong)&errno))
+# define DYNAMIC_LOADING
+ /* For really old versions of AIX, this may have to be removed. */
+# endif
+
+# ifdef HP_PA
+ /* OS is assumed to be HP/UX */
+# define MACH_TYPE "HP_PA"
+# define OS_TYPE "HPUX"
+# ifdef __LP64__
+# define CPP_WORDSZ 64
+# define ALIGNMENT 8
+# else
+# define CPP_WORDSZ 32
+# define ALIGNMENT 4
+# define ALIGN_DOUBLE
+# endif
+ extern int __data_start;
+# define DATASTART ((ptr_t)(&__data_start))
+# if 0
+ /* The following appears to work for 7xx systems running HP/UX */
+ /* 9.xx Furthermore, it might result in much faster */
+ /* collections than HEURISTIC2, which may involve scanning */
+ /* segments that directly precede the stack. It is not the */
+ /* default, since it may not work on older machine/OS */
+ /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
+ /* this.) */
+# define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
+# else
+ /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
+ /* to this. We'll probably do this on other platforms, too. */
+ /* For now I'll use it where I can test it. */
+ extern char ** environ;
+# define STACKBOTTOM ((ptr_t)environ)
+# endif
+# define STACK_GROWS_UP
+# define DYNAMIC_LOADING
+# ifndef HPUX_THREADS
+# define MPROTECT_VDB
+# endif
+# include <unistd.h>
+# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
+# endif
+
+# ifdef ALPHA
+# define MACH_TYPE "ALPHA"
+# define ALIGNMENT 8
+# define USE_GENERIC_PUSH_REGS
+ /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved
*/
+ /* fp registers in some cases when the target is a 21264. The assembly
*/
+ /* code doesn't handle that yet, and version dependencies make that a
*/
+ /* bit tricky. Do the easy thing for now.
*/
+# ifdef OSF1
+# define OS_TYPE "OSF1"
+# define DATASTART ((ptr_t) 0x140000000)
+ extern _end;
+# define DATAEND ((ptr_t) &_end)
+# define HEURISTIC2
+ /* Normally HEURISTIC2 is too conervative, since */
+ /* the text segment immediately follows the stack. */
+ /* Hence we give an upper pound. */
+ extern int __start;
+# define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
+# define CPP_WORDSZ 64
+# define MPROTECT_VDB
+# define DYNAMIC_LOADING
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define CPP_WORDSZ 64
+# define STACKBOTTOM ((ptr_t) 0x120000000)
+# ifdef __ELF__
+# define LINUX_DATA_START
+# define DYNAMIC_LOADING
+ /* This doesn't work if the collector is in a dynamic library. */
+# else
+# define DATASTART ((ptr_t) 0x140000000)
+# endif
+ extern int _end;
+# define DATAEND (&_end)
+# define MPROTECT_VDB
+ /* Has only been superficially tested. May not */
+ /* work on all versions. */
+# endif
+# endif
+
+# ifdef IA64
+# define MACH_TYPE "IA64"
+# define ALIGN_DOUBLE
+ /* Requires 16 byte alignment for malloc */
+# define ALIGNMENT 8
+# define USE_GENERIC_PUSH_REGS
+ /* We need to get preserved registers in addition to register windows.
*/
+ /* That's easiest to do with setjmp.
*/
+# ifdef HPUX
+ --> needs work
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define CPP_WORDSZ 64
+ /* This should really be done through /proc, but that */
+ /* requires we run on an IA64 kernel. */
+# define STACKBOTTOM ((ptr_t) 0xa000000000000000l)
+ /* We also need the base address of the register stack */
+ /* backing store. There is probably a better way to */
+ /* get that, too ... */
+# define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l)
+# if 1
+# define SEARCH_FOR_DATA_START
+# define DATASTART GC_data_start
+# else
+ extern int data_start;
+# define DATASTART ((ptr_t)(&data_start))
+# endif
+# define DYNAMIC_LOADING
+# define MPROTECT_VDB
+ /* Requires Linux 2.3.47 or later. */
+ extern int _end;
+# define DATAEND (&_end)
+# define PREFETCH(x) \
+ __asm__ (" lfetch [%0]": : "r"((void *)(x)))
+# define PREFETCH_FOR_WRITE(x) \
+ __asm__ (" lfetch.excl [%0]": : "r"((void *)(x)))
+# define CLEAR_DOUBLE(x) \
+ __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
+# endif
+# endif
+
+# ifdef M88K
+# define MACH_TYPE "M88K"
+# define ALIGNMENT 4
+# define ALIGN_DOUBLE
+ extern int etext;
+# ifdef CX_UX
+# define OS_TYPE "CX_UX"
+# define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
+# endif
+# ifdef DGUX
+# define OS_TYPE "DGUX"
+ extern char * GC_SysVGetDataStart();
+# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
+# endif
+# define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
+# endif
+
+# ifdef S370
+# define MACH_TYPE "S370"
+# define OS_TYPE "UTS4"
+# define ALIGNMENT 4 /* Required by hardware */
+ extern int etext;
+ extern int _etext;
+ extern int _end;
+ extern char * GC_SysVGetDataStart();
+# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
+# define DATAEND (&_end)
+# define HEURISTIC2
+# endif
+
+# if defined(PJ)
+# define ALIGNMENT 4
+ extern int _etext;
+# define DATASTART ((ptr_t)(&_etext))
+# define HEURISTIC1
+# endif
+
+# ifdef ARM32
+# define CPP_WORDSZ 32
+# define MACH_TYPE "ARM32"
+# define ALIGNMENT 4
+# ifdef NETBSD
+# define OS_TYPE "NETBSD"
+# define HEURISTIC2
+ extern char etext;
+# define DATASTART ((ptr_t)(&etext))
+# define USE_GENERIC_PUSH_REGS
+# endif
+# ifdef LINUX
+# define OS_TYPE "LINUX"
+# define HEURISTIC1
+# undef STACK_GRAN
+# define STACK_GRAN 0x10000000
+# define USE_GENERIC_PUSH_REGS
+# ifdef __ELF__
+# define DYNAMIC_LOADING
+# include <features.h>
+# if defined(__GLIBC__) && __GLIBC__ >= 2
+# define LINUX_DATA_START
+# else
+ extern char **__environ;
+# define DATASTART ((ptr_t)(&__environ))
+ /* hideous kludge: __environ is the first */
+ /* word in crt0.o, and delimits the start */
+ /* of the data segment, no matter which */
+ /* ld options were passed through. */
+ /* We could use _etext instead, but that */
+ /* would include .rodata, which may */
+ /* contain large read-only data tables */
+ /* that we'd rather not scan. */
+# endif
+ extern int _end;
+# define DATAEND (&_end)
+# else
+ extern int etext;
+# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
+# endif
+# endif
+#endif
+
+#ifdef LINUX_DATA_START
+ /* Some Linux distributions arrange to define __data_start. Some */
+ /* define data_start as a weak symbol. The latter is technically */
+ /* broken, since the user program may define data_start, in which */
+ /* case we lose. Nonetheless, we try both, prefering __data_start.
*/
+ /* We assume gcc. */
+# pragma weak __data_start
+ extern int __data_start;
+# pragma weak data_start
+ extern int data_start;
+# define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
+#endif
+
+# ifndef STACK_GROWS_UP
+# define STACK_GROWS_DOWN
+# endif
+
+# ifndef CPP_WORDSZ
+# define CPP_WORDSZ 32
+# endif
+
+# ifndef OS_TYPE
+# define OS_TYPE ""
+# endif
+
+# ifndef DATAEND
+ extern int end;
+# define DATAEND (&end)
+# endif
+
+# if defined(SVR4) && !defined(GETPAGESIZE)
+# include <unistd.h>
+# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
+# endif
+
+# ifndef GETPAGESIZE
+# if defined(SUNOS5) || defined(IRIX5)
+# include <unistd.h>
+# endif
+# define GETPAGESIZE() getpagesize()
+# endif
+
+# if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
+ /* OS has SVR4 generic features. Probably others also qualify. */
+# define SVR4
+# endif
+
+# if defined(SUNOS5) || defined(DRSNX)
+ /* OS has SUNOS5 style semi-undocumented interface to dynamic */
+ /* loader. */
+# define SUNOS5DL
+ /* OS has SUNOS5 style signal handlers. */
+# define SUNOS5SIGS
+# endif
+
+# if defined(HPUX)
+# define SUNOS5SIGS
+# endif
+
+# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
+ -> bad word size
+# endif
+
+# ifdef PCR
+# undef DYNAMIC_LOADING
+# undef STACKBOTTOM
+# undef HEURISTIC1
+# undef HEURISTIC2
+# undef PROC_VDB
+# undef MPROTECT_VDB
+# define PCR_VDB
+# endif
+
+# ifdef SRC_M3
+/* Postponed for now. */
+# undef PROC_VDB
+# undef MPROTECT_VDB
+# endif
+
+# ifdef SMALL_CONFIG
+/* Presumably not worth the space it takes. */
+# undef PROC_VDB
+# undef MPROTECT_VDB
+# endif
+
+# ifdef USE_MUNMAP
+# undef MPROTECT_VDB /* Can't deal with address space holes. */
+# endif
+
+# if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
+# define DEFAULT_VDB
+# endif
+
+# ifndef PREFETCH
+# define PREFETCH(x)
+# define NO_PREFETCH
+# endif
+
+# ifndef PREFETCH_FOR_WRITE
+# define PREFETCH_FOR_WRITE(x)
+# define NO_PREFETCH_FOR_WRITE
+# endif
+
+# ifndef CACHE_LINE_SIZE
+# define CACHE_LINE_SIZE 32 /* Wild guess */
+# endif
+
+# ifndef CLEAR_DOUBLE
+# define CLEAR_DOUBLE(x) \
+ ((word*)x)[0] = 0; \
+ ((word*)x)[1] = 0;
+# endif /* CLEAR_DOUBLE */
+
+# if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
+# define SOLARIS_THREADS
+# endif
+# if defined(IRIX_THREADS) && !defined(IRIX5)
+--> inconsistent configuration
+# endif
+# if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
+--> inconsistent configuration
+# endif
+# if defined(LINUX_THREADS) && !defined(LINUX)
+--> inconsistent configuration
+# endif
+# if defined(SOLARIS_THREADS) && !defined(SUNOS5)
+--> inconsistent configuration
+# endif
+# if defined(HPUX_THREADS) && !defined(HPUX)
+--> inconsistent configuration
+# endif
+# if defined(PCR) || defined(SRC_M3) || \
+ defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
+ defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
+ defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
+# define THREADS
+# endif
+
+# if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
+ || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
+ /* Use setjmp based hack to mark from callee-save registers. */
+# define USE_GENERIC_PUSH_REGS
+# endif
+# if defined(SPARC) && !defined(LINUX)
+# define SAVE_CALL_CHAIN
+# define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
+ /* include assembly code to do it well. */
+# endif
+
+# if defined(LINUX) && !defined(POWERPC)
+# include <linux/version.h>
+# if (LINUX_VERSION_CODE <= 0x10400)
+ /* Ugly hack to get struct sigcontext_struct definition. Required
*/
+ /* for some early 1.3.X releases. Will hopefully go away soon. */
+ /* in some later Linux releases, asm/sigcontext.h may have to */
+ /* be included instead. */
+# define __KERNEL__
+# include <asm/signal.h>
+# undef __KERNEL__
+# else
+ /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
+ /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
+ /* prototypes, so we have to include the top-level sigcontext.h to */
+ /* make sure the former gets defined to be the latter if appropriate. */
+# include <features.h>
+# if 2 <= __GLIBC__
+# if 2 == __GLIBC__ && 0 == __GLIBC_MINOR__
+ /* glibc 2.1 no longer has sigcontext.h. But signal.h */
+ /* has the right declaration for glibc 2.1. */
+# include <sigcontext.h>
+# endif /* 0 == __GLIBC_MINOR__ */
+# else /* not 2 <= __GLIBC__ */
+ /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
+ /* one. Check LINUX_VERSION_CODE to see which we should reference. */
+# include <asm/sigcontext.h>
+# endif /* 2 <= __GLIBC__ */
+# endif
+# endif
+# if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
+# include <sys/types.h>
+# if !defined(MSWIN32) && !defined(SUNOS4)
+# include <unistd.h>
+# endif
+# endif
+
+# include <stdio.h>
+# include <signal.h>
+
+/* Blatantly OS dependent routines, except for those that are related */
+/* to dynamic loading. */
+
+# if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
+# define NEED_FIND_LIMIT
+# endif
+
+# if defined(IRIX_THREADS) || defined(HPUX_THREADS)
+# define NEED_FIND_LIMIT
+# endif
+
+# if (defined(SUNOS4) && defined(DYNAMIC_LOADING)) && !defined(PCR)
+# define NEED_FIND_LIMIT
+# endif
+
+# if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
+# define NEED_FIND_LIMIT
+# endif
+
+# if defined(LINUX) && \
+ (defined(POWERPC) || defined(SPARC) || defined(ALPHA) || defined(IA64) \
+ || defined(MIPS))
+# define NEED_FIND_LIMIT
+# endif
+
+#ifdef NEED_FIND_LIMIT
+# include <setjmp.h>
+#endif
+
+#ifdef FREEBSD
+# include <machine/trap.h>
+#endif
+
+#ifdef AMIGA
+# include <proto/exec.h>
+# include <proto/dos.h>
+# include <dos/dosextens.h>
+# include <workbench/startup.h>
+#endif
+
+#ifdef MSWIN32
+# define WIN32_LEAN_AND_MEAN
+# define NOSERVICE
+# include <windows.h>
+#endif
+
+#ifdef MACOS
+# include <Processes.h>
+#endif
+
+#ifdef IRIX5
+# include <sys/uio.h>
+# include <malloc.h> /* for locking */
+#endif
+#ifdef USE_MMAP
+# include <sys/types.h>
+# include <sys/mman.h>
+# include <sys/stat.h>
+# include <fcntl.h>
+#endif
+
+#ifdef SUNOS5SIGS
+# include <sys/siginfo.h>
+# undef setjmp
+# undef longjmp
+# define setjmp(env) sigsetjmp(env, 1)
+# define longjmp(env, val) siglongjmp(env, val)
+# define jmp_buf sigjmp_buf
+#endif
+
+#ifdef DJGPP
+ /* Apparently necessary for djgpp 2.01. May casuse problems with */
+ /* other versions. */
+ typedef long unsigned int caddr_t;
+#endif
+
+#ifdef PCR
+# include "il/PCR_IL.h"
+# include "th/PCR_ThCtl.h"
+# include "mm/PCR_MM.h"
+#endif
+
+#if !defined(NO_EXECUTE_PERMISSION)
+# define OPT_PROT_EXEC PROT_EXEC
+#else
+# define OPT_PROT_EXEC 0
+#endif
+
+# ifdef OS2
+
+# include <stddef.h>
+
+# if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
+
+# else /* IBM's compiler */
+
+/* A kludge to get around what appears to be a header file bug */
+# ifndef WORD
+# define WORD unsigned short
+# endif
+# ifndef DWORD
+# define DWORD unsigned long
+# endif
+
+# define EXE386 1
+# include <newexe.h>
+# include <exe386.h>
+
+# endif /* __IBMC__ */
+
+# define INCL_DOSEXCEPTIONS
+# define INCL_DOSPROCESS
+# define INCL_DOSERRORS
+# define INCL_DOSMODULEMGR
+# define INCL_DOSMEMMGR
+# include <os2.h>
+
+# endif /*!OS/2 */
+
+/*
+ * Find the base of the stack.
+ * Used only in single-threaded environment.
+ * With threads, GC_mark_roots needs to know how to do this.
+ * Called with allocator lock held.
+ */
+# ifdef MSWIN32
+# define is_writable(prot) ((prot) == PAGE_READWRITE \
+ || (prot) == PAGE_WRITECOPY \
+ || (prot) == PAGE_EXECUTE_READWRITE \
+ || (prot) == PAGE_EXECUTE_WRITECOPY)
+/* Return the number of bytes that are writable starting at p. */
+/* The pointer p is assumed to be page aligned. */
+/* If base is not 0, *base becomes the beginning of the */
+/* allocation region containing p. */
+static word GC_get_writable_length(ptr_t p, ptr_t *base)
+{
+ MEMORY_BASIC_INFORMATION buf;
+ word result;
+ word protect;
+
+ result = VirtualQuery(p, &buf, sizeof(buf));
+ if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
+ if (base != 0) *base = (ptr_t)(buf.AllocationBase);
+ protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
+ if (!is_writable(protect)) {
+ return(0);
+ }
+ if (buf.State != MEM_COMMIT) return(0);
+ return(buf.RegionSize);
+}
+
+void *scm_get_stack_base()
+{
+ int dummy;
+ ptr_t sp = (ptr_t)(&dummy);
+ ptr_t trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
+ word size = GC_get_writable_length(trunc_sp, 0);
+
+ return(trunc_sp + size);
+}
+
+
+# else
+
+# ifdef OS2
+
+void *scm_get_stack_base()
+{
+ PTIB ptib;
+ PPIB ppib;
+
+ if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
+ GC_err_printf0("DosGetInfoBlocks failed\n");
+ ABORT("DosGetInfoBlocks failed\n");
+ }
+ return((ptr_t)(ptib -> tib_pstacklimit));
+}
+
+# else
+
+# ifdef AMIGA
+
+void *scm_get_stack_base()
+{
+ struct Process *proc = (struct Process*)SysBase->ThisTask;
+
+ /* Reference: Amiga Guru Book Pages: 42,567,574 */
+ if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS
+ && proc->pr_CLI != NULL) {
+ /* first ULONG is StackSize */
+ /*longPtr = proc->pr_ReturnAddr;
+ size = longPtr[0];*/
+
+ return (char *)proc->pr_ReturnAddr + sizeof(ULONG);
+ } else {
+ return (char *)proc->pr_Task.tc_SPUpper;
+ }
+}
+
+#if 0 /* old version */
+void *scm_get_stack_base()
+{
+ extern struct WBStartup *_WBenchMsg;
+ extern long __base;
+ extern long __stack;
+ struct Task *task;
+ struct Process *proc;
+ struct CommandLineInterface *cli;
+ long size;
+
+ if ((task = FindTask(0)) == 0) {
+ GC_err_puts("Cannot find own task structure\n");
+ ABORT("task missing");
+ }
+ proc = (struct Process *)task;
+ cli = BADDR(proc->pr_CLI);
+
+ if (_WBenchMsg != 0 || cli == 0) {
+ size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
+ } else {
+ size = cli->cli_DefaultStack * 4;
+ }
+ return (ptr_t)(__base + GC_max(size, __stack));
+}
+#endif /* 0 */
+
+# else /* !AMIGA, !OS2, ... */
+
+# ifdef NEED_FIND_LIMIT
+ /* Some tools to implement HEURISTIC2 */
+# define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
+ /* static */ jmp_buf GC_jmp_buf;
+
+ /*ARGSUSED*/
+ static void GC_fault_handler(sig)
+ int sig;
+ {
+ longjmp(GC_jmp_buf, 1);
+ }
+
+# ifdef __STDC__
+ typedef void (*handler)(int);
+# else
+ typedef void (*handler)();
+# endif
+
+# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
+ static struct sigaction old_segv_act;
+# if defined(_sigargs) || defined(HPUX) /* !Irix6.x */
+ static struct sigaction old_bus_act;
+# endif
+# else
+ static handler old_segv_handler, old_bus_handler;
+# endif
+
+ static void GC_setup_temporary_fault_handler()
+ {
+# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
+ struct sigaction act;
+
+ act.sa_handler = GC_fault_handler;
+ act.sa_flags = SA_RESTART | SA_NODEFER;
+ /* The presence of SA_NODEFER represents yet another gross */
+ /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
+ /* interact correctly with -lthread. We hide the confusion */
+ /* by making sure that signal handling doesn't affect the */
+ /* signal mask. */
+
+ (void) sigemptyset(&act.sa_mask);
+# ifdef IRIX_THREADS
+ /* Older versions have a bug related to retrieving and */
+ /* and setting a handler at the same time. */
+ (void) sigaction(SIGSEGV, 0, &old_segv_act);
+ (void) sigaction(SIGSEGV, &act, 0);
+# else
+ (void) sigaction(SIGSEGV, &act, &old_segv_act);
+# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
+ || defined(HPUX)
+ /* Under Irix 5.x or HP/UX, we may get SIGBUS. */
+ /* Pthreads doesn't exist under Irix 5.x, so we */
+ /* don't have to worry in the threads case. */
+ (void) sigaction(SIGBUS, &act, &old_bus_act);
+# endif
+# endif /* IRIX_THREADS */
+# else
+ old_segv_handler = signal(SIGSEGV, GC_fault_handler);
+# ifdef SIGBUS
+ old_bus_handler = signal(SIGBUS, GC_fault_handler);
+# endif
+# endif
+ }
+
+ static void GC_reset_fault_handler()
+ {
+# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
+ (void) sigaction(SIGSEGV, &old_segv_act, 0);
+# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
+ || defined(HPUX)
+ (void) sigaction(SIGBUS, &old_bus_act, 0);
+# endif
+# else
+ (void) signal(SIGSEGV, old_segv_handler);
+# ifdef SIGBUS
+ (void) signal(SIGBUS, old_bus_handler);
+# endif
+# endif
+ }
+
+ /* Return the first nonaddressible location > p (up) or */
+ /* the smallest location q s.t. [q,p] is addressible (!up). */
+ static ptr_t GC_find_limit(p, up)
+ ptr_t p;
+ GC_bool up;
+ {
+ static VOLATILE ptr_t result;
+ /* Needs to be static, since otherwise it may not be */
+ /* preserved across the longjmp. Can safely be */
+ /* static since it's only called once, with the */
+ /* allocation lock held. */
+
+
+ GC_setup_temporary_fault_handler();
+ if (setjmp(GC_jmp_buf) == 0) {
+ result = (ptr_t)(((word)(p))
+ & ~(MIN_PAGE_SIZE-1));
+ for (;;) {
+ if (up) {
+ result += MIN_PAGE_SIZE;
+ } else {
+ result -= MIN_PAGE_SIZE;
+ }
+ GC_noop1((word)(*result));
+ }
+ }
+ GC_reset_fault_handler();
+ if (!up) {
+ result += MIN_PAGE_SIZE;
+ }
+ return(result);
+ }
+# endif
+
+#ifdef LINUX_STACKBOTTOM
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+# define STAT_SKIP 27 /* Number of fields preceding startstack */
+ /* field in /proc/self/stat */
+
+ static ptr_t GC_linux_stack_base(void)
+ {
+ /* We read the stack base value from /proc/self/stat. We do this */
+ /* using direct I/O system calls in order to avoid calling malloc */
+ /* in case REDIRECT_MALLOC is defined. */
+# define STAT_BUF_SIZE 4096
+# ifdef USE_LD_WRAP
+# define STAT_READ __real_read
+# else
+# define STAT_READ read
+# endif
+ char stat_buf[STAT_BUF_SIZE];
+ int f;
+ char c;
+ word result = 0;
+ size_t i, buf_offset = 0;
+
+ f = open("/proc/self/stat", O_RDONLY);
+ if (f < 0 || STAT_READ(f, stat_buf, STAT_BUF_SIZE) < 2 * STAT_SKIP) {
+ ABORT("Couldn't read /proc/self/stat");
+ }
+ c = stat_buf[buf_offset++];
+ /* Skip the required number of fields. This number is hopefully */
+ /* constant across all Linux implementations. */
+ for (i = 0; i < STAT_SKIP; ++i) {
+ while (isspace(c)) c = stat_buf[buf_offset++];
+ while (!isspace(c)) c = stat_buf[buf_offset++];
+ }
+ while (isspace(c)) c = stat_buf[buf_offset++];
+ while (isdigit(c)) {
+ result *= 10;
+ result += c - '0';
+ c = stat_buf[buf_offset++];
+ }
+ close(f);
+ if (result < 0x10000000) ABORT("Absurd stack bottom value");
+ return (ptr_t)result;
+ }
+
+#endif /* LINUX_STACKBOTTOM */
+
+void *scm_get_stack_base()
{
- return NULL;
+ word dummy;
+ void *result = &dummy; /* initialize to silence compiler */
+
+# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
+
+# ifdef STACKBOTTOM
+ return(STACKBOTTOM);
+# else
+# ifdef HEURISTIC1
+# ifdef STACK_GROWS_DOWN
+ result = (ptr_t)((((word)(&dummy))
+ + STACKBOTTOM_ALIGNMENT_M1)
+ & ~STACKBOTTOM_ALIGNMENT_M1);
+# else
+ result = (ptr_t)(((word)(&dummy))
+ & ~STACKBOTTOM_ALIGNMENT_M1);
+# endif
+# endif /* HEURISTIC1 */
+# ifdef LINUX_STACKBOTTOM
+ result = GC_linux_stack_base();
+# endif
+# ifdef HEURISTIC2
+# ifdef STACK_GROWS_DOWN
+ result = GC_find_limit((ptr_t)(&dummy), TRUE);
+# ifdef HEURISTIC2_LIMIT
+ if (result > HEURISTIC2_LIMIT
+ && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
+ result = HEURISTIC2_LIMIT;
+ }
+# endif
+# else
+ result = GC_find_limit((ptr_t)(&dummy), FALSE);
+# ifdef HEURISTIC2_LIMIT
+ if (result < HEURISTIC2_LIMIT
+ && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
+ result = HEURISTIC2_LIMIT;
+ }
+# endif
+# endif
+
+# endif /* HEURISTIC2 */
+# ifdef STACK_GROWS_DOWN
+ if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
+# endif
+ return(result);
+# endif /* STACKBOTTOM */
}
+
+# endif /* ! AMIGA */
+# endif /* ! OS2 */
+# endif /* ! MSWIN32 */
- guile/guile-core/libguile gc_os_dep.c,
Marius Vollmer <=