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guile/libguile/gc_os_dep.c
Rob Browning 537abaae4d update ifdefery for macosx. 
(scm_get_stack_base): separate result initialization from
declaration to slience warnings with macosx and hp-ux using gcc
3.3.  Thanks to Andreas Vögele.
2004-06-16 04:09:52 +00:00

1936 lines
56 KiB
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/*
* 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, 2001, 2002, 2003 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.
*
*/
/*
* Copied from gc5.2, files "os_dep.c", "gc_priv.h", "mark.c" and "gcconfig.h",
* and modified for Guile by Marius Vollmer.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <ctype.h>
#include "libguile/gc.h"
#include "libguile/scmconfig.h"
#ifdef HAVE_LIBC_STACK_END
extern void *__libc_stack_end;
void *
scm_get_stack_base ()
{
return __libc_stack_end;
}
#else
#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;
typedef int GC_bool;
# define TRUE 1
# define FALSE 0
#if defined(__STDC__)
# include <stdlib.h>
# if !(defined( sony_news ) )
# include <stddef.h>
# endif
# define VOLATILE volatile
#else
# ifdef MSWIN32
# include <stdlib.h>
# endif
# define VOLATILE
#endif
/* 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(__powerpc__)
# define POWERPC
# define NETBSD
# 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(__NetBSD__) && defined(__sparc__)
# define SPARC
# 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) || 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) || \
(defined(__APPLE__) && defined(__MACH__) && defined(__ppc__))
# 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) || 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
# if defined(__s390__) && defined(LINUX)
# define S370
# define mach_type_known
# endif
# if defined(__GNU__)
# define I386
# define GNU
# define mach_type_known
# endif
# if defined(__SCO_VERSION__)
# define I386
# define SYSV
# 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
void *
scm_get_stack_base ()
{
return NULL;
}
# else
/* 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 SCM_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 SCM_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
# ifdef GNU
# define OS_TYPE "GNU"
# 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
# ifndef SCM_STACK_GROWS_UP /* don't fight with scmconfig.h */
# define SCM_STACK_GROWS_UP 1
# endif
# 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
# if SCM_STACK_GROWS_UP
# define STACK_GROWS_DOWN 0
# else
# define STACK_GROWS_DOWN 1
#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)
# if 0
# 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__
# endif
# 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 <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;
word size;
static word GC_page_size = 0;
if (!GC_page_size) {
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
GC_page_size = sysinfo.dwPageSize;
}
trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
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
}
/* Single argument version, robust against whole program analysis. */
static void
GC_noop1(x)
word x;
{
static VOLATILE word sink;
sink = x;
}
/* 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()
{
word dummy;
void *result;
result = &dummy; /* initialize to silence compiler */
# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
# ifdef STACKBOTTOM
return(STACKBOTTOM);
# else
# ifdef HEURISTIC1
# if 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
# if 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 */
# if 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 */
#endif /* mach_type_known */
#endif /* ! HAVE_LIBC_STACK_END */
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