/* * Copyright 1988, 1989, 2010 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, 2004, 2006, 2008 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. */ #ifdef HAVE_CONFIG_H # include #endif #include #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 # if !(defined( sony_news ) ) # include # endif # define VOLATILE volatile #else # ifdef MSWIN32 # include # 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(__alpha__) # define ALPHA # define NETBSD # define mach_type_known # endif # if defined(__FreeBSD__) && defined(__sparc__) # define SPARC # define FREEBSD # include # define mach_type_known # endif # if defined(__NetBSD__) && defined(__powerpc__) # define POWERPC # define NETBSD # define mach_type_known # endif /* in netbsd 2.0 only __m68k__ is defined, not m68k */ # if defined(__NetBSD__) && (defined(m68k) || defined(__m68k__)) # define M68K # define NETBSD # define mach_type_known # endif /* in netbsd 2.0 only __arm__ is defined, not arm32 */ # if defined(__NetBSD__) && (defined(arm32) || defined(__arm__)) # 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 # 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(__FreeBSD__) && defined(__ia64__) # define FREEBSD # define IA64 # define mach_type_known # endif # if defined(__FreeBSD__) && defined(__amd64__) # define FREEBSD # define AMD64 # define mach_type_known # endif # if defined(__FreeBSD__) && defined(__alpha__) # define FREEBSD # define ALPHA # define mach_type_known # elif defined(__alpha) || defined(__alpha__) # define ALPHA # if !defined(LINUX) && !defined (NETBSD) # 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 () { ABORT ("Can't determine 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 # 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 # 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 # 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 # 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" extern int etext; # ifdef SUNOS5 # define OS_TYPE "SUNOS5" # define OS_TYPE "SUNOS5" extern int _etext[], _end[]; ptr_t GC_SysVGetDataStart(size_t, ptr_t); # define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext) # define DATAEND (ptr_t)(_end) /* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */ /* but reportedly breaks under 2.8. It appears that the stack */ /* base is a property of the executable, so this should not break */ /* old executables. */ /* HEURISTIC2 probably works, but this appears to be preferable. */ # include # define STACKBOTTOM ((ptr_t) USRSTACK) # 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 # 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 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[], _end[]; ptr_t GC_SysVGetDataStart(size_t, ptr_t); # define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext) # define DATAEND (ptr_t)(_end) /* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */ /* but reportedly breaks under 2.8. It appears that the stack */ /* base is a property of the executable, so this should not break */ /* old executables. */ /* HEURISTIC2 probably works, but this appears to be preferable. */ # include # define STACKBOTTOM ((ptr_t) USRSTACK) /** 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 # 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" # ifdef LINUX # define CPP_WORDSZ _MIPS_SZPTR # define OS_TYPE "LINUX" # define ALIGNMENT 4 # define ALIGN_DOUBLE extern int _fdata; # define DATASTART ((ptr_t)(&_fdata)) extern int _end; # define DATAEND ((ptr_t)(&_end)) # define STACKBOTTOM ((ptr_t)0x7fff8000) # define USE_GENERIC_PUSH_REGS 1 # define DYNAMIC_LOADING # 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 # 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 int _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 AMD64 # define MACH_TYPE "AMD64" # define ALIGN_DOUBLE # define ALIGNMENT 8 # define USE_GENERIC_PUSH_REGS # 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 # 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 # define GETPAGESIZE() sysconf(_SC_PAGESIZE) # endif # ifndef GETPAGESIZE # if defined(SUNOS5) || defined(IRIX5) # include # 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 # 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 # 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 # 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 # endif /* 0 == __GLIBC_MINOR__ */ # else /* not 2 <= __GLIBC__ */ /* libc5 doesn't have : go directly with the kernel */ /* one. Check LINUX_VERSION_CODE to see which we should reference. */ # include # endif /* 2 <= __GLIBC__ */ # endif # endif # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS) # include # if !defined(MSWIN32) && !defined(SUNOS4) # include # endif # endif # include /* 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 #endif #if defined(FREEBSD) && defined(I386) # include # define ALIGNMENT 4 # define CPP_WORDSZ 32 #endif #if defined(FREEBSD) && defined(SPARC) # define ALIGNMENT 8 # define ALIGN_DOUBLE #endif #ifdef AMIGA # include # include # include # include #endif #ifdef MSWIN32 # define WIN32_LEAN_AND_MEAN # define NOSERVICE # include #endif #ifdef MACOS # include #endif #ifdef IRIX5 # include # include /* for locking */ #endif #ifdef USE_MMAP # include # include # include # include #endif #ifdef SUNOS5SIGS /*# include */ # 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 # 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 # include # endif /* __IBMC__ */ # define INCL_DOSEXCEPTIONS # define INCL_DOSPROCESS # define INCL_DOSERRORS # define INCL_DOSMODULEMGR # define INCL_DOSMEMMGR # include # 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*/ #if !(defined(FREEBSD) && defined(SPARC)) static void GC_fault_handler(sig) int sig; { longjmp(GC_jmp_buf, 1); } #endif # ifdef __STDC__ typedef void (*handler)(int); # else typedef void (*handler)(); # endif #if !(defined(FREEBSD) && defined(SPARC)) # 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 #endif #if !(defined(FREEBSD) && defined(SPARC)) 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 } #endif #if !(defined(FREEBSD) && defined(SPARC)) 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 } #endif /* Single argument version, robust against whole program analysis. */ #if !(defined(FREEBSD) && defined(SPARC)) static void GC_noop1(x) word x; { static VOLATILE word sink; sink = x; } #endif /* Return the first nonaddressible location > p (up) or */ /* the smallest location q s.t. [q,p] is addressible (!up). */ #if !(defined(FREEBSD) && defined(SPARC)) 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 # endif #ifdef LINUX_STACKBOTTOM #include #include #include # 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 ((ptr_t)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 */