gcconfig.h

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# ifdef M88K
#   define MACH_TYPE "M88K"
#   define ALIGNMENT 4
    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 ptr_t GC_SysVGetDataStart(size_t, ptr_t);
#       define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)etext)
#   endif
#   define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
# endif

# ifdef S370
    /* If this still works, and if anyone cares, this should probably	*/
    /* be moved to the S390 category.					*/
#   define MACH_TYPE "S370"
#   define ALIGNMENT 4	/* Required by hardware	*/
#   ifdef UTS4
#       define OS_TYPE "UTS4"
	extern int etext[];
	extern int _etext[];
	extern int _end[];
	extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
#       define DATASTART GC_SysVGetDataStart(0x10000, (ptr_t)_etext)
#	define DATAEND (_end)
#	define HEURISTIC2
#   endif
# endif

# ifdef S390
#   define MACH_TYPE "S390"
#   ifndef __s390x__
#   define ALIGNMENT 4
#   define CPP_WORDSZ 32
#   else
#   define ALIGNMENT 8
#   define CPP_WORDSZ 64
#   ifndef HBLKSIZE
#     define HBLKSIZE 4096
#   endif
#   endif
#   ifdef LINUX
#       define OS_TYPE "LINUX"
#       define LINUX_STACKBOTTOM
#       define DYNAMIC_LOADING
	extern int __data_start[];
#       define DATASTART ((ptr_t)(__data_start))
    extern int _end[];
#   define DATAEND (_end)
#   define CACHE_LINE_SIZE 256
#   define GETPAGESIZE() 4096
#   endif
# endif

# ifdef ARM32
#   define CPP_WORDSZ 32
#   define MACH_TYPE "ARM32"
#   define ALIGNMENT 4
#   ifdef NETBSD
#       define OS_TYPE "NETBSD"
#       define HEURISTIC2
#	ifdef __ELF__
#          define DATASTART GC_data_start
#	   define DYNAMIC_LOADING
#	else
           extern char etext[];
#          define DATASTART ((ptr_t)(etext))
#	endif
#   endif
#   ifdef LINUX
#       define OS_TYPE "LINUX"
#       define LINUX_STACKBOTTOM
#       undef STACK_GRAN
#       define STACK_GRAN 0x10000000
#       ifdef __ELF__
#            define DYNAMIC_LOADING
#	     include <features.h>
#	     if defined(__GLIBC__) && __GLIBC__ >= 2
#		 define SEARCH_FOR_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
#   ifdef MSWINCE
#     define OS_TYPE "MSWINCE"
#     define DATAEND /* not needed */
#   endif
#   ifdef NOSYS
      /* __data_start is usually defined in the target linker script.  */
      extern int __data_start[];
#     define DATASTART (ptr_t)(__data_start)
      /* __stack_base__ is set in newlib/libc/sys/arm/crt0.S  */
      extern void *__stack_base__;
#     define STACKBOTTOM ((ptr_t) (__stack_base__))
#   endif
#endif

# ifdef CRIS
#   define MACH_TYPE "CRIS"
#   define CPP_WORDSZ 32
#   define ALIGNMENT 1
#   define OS_TYPE "LINUX"
#   define DYNAMIC_LOADING
#   define LINUX_STACKBOTTOM
#   define SEARCH_FOR_DATA_START
      extern int _end[];
#   define DATAEND (_end)
# endif

# ifdef SH
#   define MACH_TYPE "SH"
#   define ALIGNMENT 4
#   ifdef MSWINCE
#     define OS_TYPE "MSWINCE"
#     define DATAEND /* not needed */
#   endif
#   ifdef LINUX
#     define OS_TYPE "LINUX"
#     define LINUX_STACKBOTTOM
#     define DYNAMIC_LOADING
#     define SEARCH_FOR_DATA_START
      extern int _end[];
#     define DATAEND (_end)
#   endif
#   ifdef NETBSD
#      define OS_TYPE "NETBSD"
#      define HEURISTIC2
#      define DATASTART GC_data_start
#      define DYNAMIC_LOADING
#   endif
# endif
 
# ifdef SH4
#   define MACH_TYPE "SH4"
#   define OS_TYPE "MSWINCE"
#   define ALIGNMENT 4
#   define DATAEND /* not needed */
# endif

# ifdef M32R
#   define CPP_WORDSZ 32
#   define MACH_TYPE "M32R"
#   define ALIGNMENT 4
#   ifdef LINUX
#     define OS_TYPE "LINUX"
#     define LINUX_STACKBOTTOM
#     undef STACK_GRAN
#     define STACK_GRAN 0x10000000
#     define DYNAMIC_LOADING
#     define SEARCH_FOR_DATA_START
      extern int _end[];
#     define DATAEND (_end)
#   endif
# endif

# ifdef X86_64
#   define MACH_TYPE "X86_64"
#   define ALIGNMENT 8
#   define CPP_WORDSZ 64
#   ifndef HBLKSIZE
#     define HBLKSIZE 4096
#   endif
#   define CACHE_LINE_SIZE 64
#   ifdef LINUX
#	define OS_TYPE "LINUX"
#       define LINUX_STACKBOTTOM
#       if !defined(GC_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>
#	     define SEARCH_FOR_DATA_START
	     extern int _end[];
#	     define DATAEND (_end)
#	else
	     extern int etext[];
#            define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
#       endif
#       if defined(__GNUC__) && __GNUC__ >= 3
#	    define PREFETCH(x) __builtin_prefetch((x), 0, 0)
#	    define PREFETCH_FOR_WRITE(x) __builtin_prefetch((x), 1)
#	endif
#   endif
#   ifdef DARWIN
#     define OS_TYPE "DARWIN"
#     define DARWIN_DONT_PARSE_STACK
#     define DYNAMIC_LOADING
      /* XXX: see get_end(3), get_etext() and get_end() should not be used.
	 These aren't used when dyld support is enabled (it is by default) */
#     define DATASTART ((ptr_t) get_etext())
#     define DATAEND	((ptr_t) get_end())
#     define STACKBOTTOM ((ptr_t) 0x7fff5fc00000)
#     define USE_MMAP
#     define USE_MMAP_ANON
#     ifdef GC_DARWIN_THREADS
#       define MPROTECT_VDB
#     endif
#     include <unistd.h>
#     define GETPAGESIZE() getpagesize()
      /* There seems to be some issues with trylock hanging on darwin. This
	 should be looked into some more */
#     define NO_PTHREAD_TRYLOCK
#   endif
#   ifdef FREEBSD
#	define OS_TYPE "FREEBSD"
#	ifndef GC_FREEBSD_THREADS
#	    define MPROTECT_VDB
#	endif
#	ifdef __GLIBC__
#	    define SIG_SUSPEND		(32+6)
#	    define SIG_THR_RESTART	(32+5)
	    extern int _end[];
#	    define DATAEND (_end)
#	else
#	    define SIG_SUSPEND SIGUSR1
#	    define SIG_THR_RESTART SIGUSR2
#	endif
#	define FREEBSD_STACKBOTTOM
#	ifdef __ELF__
#	    define DYNAMIC_LOADING
#	endif
	extern char etext[];
	extern char * GC_FreeBSDGetDataStart();
#	define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
#   endif
#   ifdef NETBSD
#	define OS_TYPE "NETBSD"
#	ifdef __ELF__
#	    define DYNAMIC_LOADING
#	endif
#	define HEURISTIC2
	extern char etext[];
#	define SEARCH_FOR_DATA_START
#   endif
#   ifdef SOLARIS
#	define OS_TYPE "SOLARIS"
#	define ELF_CLASS ELFCLASS64
        extern int _etext[], _end[];
  	extern ptr_t GC_SysVGetDataStart(size_t, ptr_t);
#       define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext)
#	define DATAEND (_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.	*/
/*	Apparently USRSTACK is defined to be USERLIMIT, but in some	*/
/* 	installations that's undefined.  We work around this with a	*/
/*	gross hack:							*/
#       include <sys/vmparam.h>
#	ifdef USERLIMIT
	  /* This should work everywhere, but doesn't.	*/
#	  define STACKBOTTOM USRSTACK
#       else
#	  define HEURISTIC2
#       endif
/* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
/* It appears to be fixed in 2.8 and 2.9.				*/
#	ifdef SOLARIS25_PROC_VDB_BUG_FIXED
#	  define PROC_VDB
#	endif
#	define DYNAMIC_LOADING
#	if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
#	    define USE_MMAP
	    /* Otherwise we now use calloc.  Mmap may result in the	*/
	    /* heap interleaved with thread stacks, which can result in	*/
	    /* excessive blacklisting.  Sbrk is unusable since it	*/
	    /* doesn't interact correctly with the system malloc.	*/
#	endif
#       ifdef USE_MMAP
#         define HEAP_START (ptr_t)0x40000000
#       else
#	  define HEAP_START DATAEND
#       endif
#   endif
#   ifdef MSWIN32
#	define OS_TYPE "MSWIN32"
		/* STACKBOTTOM and DATASTART are handled specially in 	*/
		/* os_dep.c.						*/
#       if !defined(__WATCOMC__)
#	  define MPROTECT_VDB
	  /* We also avoided doing this in the past with GC_WIN32_THREADS */
	  /* Hopefully that's fixed.					  */
#	endif
#	if _MSC_VER >= 1300  /* .NET, i.e. > VisualStudio 6	*/
#         define GWW_VDB
#	endif
#       define DATAEND  /* not needed */
#   endif
# endif

#if defined(LINUX) && defined(USE_MMAP)
    /* The kernel may do a somewhat better job merging mappings etc.	*/
    /* with anonymous mappings.						*/
#   define USE_MMAP_ANON
#endif

#if defined(GC_LINUX_THREADS) && defined(REDIRECT_MALLOC)
    /* Nptl allocates thread stacks with mmap, which is fine.  But it	*/
    /* keeps a cache of thread stacks.  Thread stacks contain the	*/
    /* thread control blocks.  These in turn contain a pointer to	*/
    /* (sizeof (void *) from the beginning of) the dtv for thread-local	*/
    /* storage, which is calloc allocated.  If we don't scan the cached	*/
    /* thread stacks, we appear to lose the dtv.  This tends to		*/
    /* result in something that looks like a bogus dtv count, which	*/
    /* tends to result in a memset call on a block that is way too	*/
    /* large.  Sometimes we're lucky and the process just dies ...	*/
    /* There seems to be a similar issue with some other memory 	*/
    /* allocated by the dynamic loader.					*/
    /* This can be avoided by either:					*/
    /* - Defining USE_PROC_FOR_LIBRARIES here.				*/
    /*   That performs very poorly, precisely because we end up 	*/
    /*   scanning cached stacks.					*/
    /* - Have calloc look at its callers.  That is currently what we do.*/
    /*   In spite of the fact that it is gross and disgusting.		*/
/* #   define USE_PROC_FOR_LIBRARIES */
#endif

# ifndef STACK_GROWS_UP
#   define STACK_GROWS_DOWN
# endif

# ifndef CPP_WORDSZ
#   define CPP_WORDSZ 32
# endif

# ifndef OS_TYPE
#   define OS_TYPE ""
# endif

# ifndef DATAEND
    extern int end[];
#   define DATAEND (end)
# endif

# if defined(SVR4) && !defined(GETPAGESIZE)
#    include <unistd.h>
#    define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
# endif

# ifndef GETPAGESIZE
#   if defined(SOLARIS) || defined(IRIX5) || defined(LINUX) \
       || defined(NETBSD) || defined(FREEBSD) || defined(HPUX)
#	include <unistd.h>
#   endif
#   define GETPAGESIZE() getpagesize()
# endif

# if defined(SOLARIS) || defined(DRSNX) || defined(UTS4)
	    /* OS has SVR4 generic features.		*/
    	    /* Probably others also qualify.		*/
#   define SVR4
# endif

# if defined(SOLARIS) || defined(DRSNX)
	    /* OS has SOLARIS style semi-undocumented interface */
    	    /* to dynamic loader.				*/
#   define SOLARISDL
	    /* OS has SOLARIS style signal handlers.		*/
#   define SUNOS5SIGS
# endif

# if defined(HPUX)
#   define SUNOS5SIGS
# endif

# if defined(FREEBSD) && \
     (defined(__DragonFly__) || __FreeBSD__ >= 4 || (__FreeBSD_kernel__ >= 4))
#   define SUNOS5SIGS
# endif

# ifdef GC_NETBSD_THREADS
#   define SIGRTMIN 33
#   define SIGRTMAX 63
# endif

# if defined(SVR4) || defined(LINUX) || defined(IRIX5) || defined(HPUX) \
	    || defined(OPENBSD) || defined(NETBSD) || defined(FREEBSD) \
	    || defined(DGUX) || defined(BSD) \
	    || defined(AIX) || defined(DARWIN) || defined(OSF1) \
	    || defined(HURD)
#   define UNIX_LIKE   /* Basic Unix-like system calls work.	*/
# endif

# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
	   ->