/*

* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers

* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.

* Copyright (c) 1996 by Silicon Graphics. All rights reserved.

*

* 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.

*/

#ifndef GCCONFIG_H

# define GCCONFIG_H

/* Machine dependent parameters. Some tuning parameters can be found */

/* near the top of gc_private.h. */

/* Machine specific parts contributed by various people. See README file. */

/* First a unified test for Linux: */

# if defined(linux) || defined(__linux__)

# define LINUX

# endif

/* Determine the machine type: */

# if defined(sun) && defined(mc68000)

# define M68K

# define SUNOS4

# define mach_type_known

# endif

# if defined(hp9000s300)

# define M68K

# define HP

# define mach_type_known

# endif

# if defined(__OpenBSD__) && defined(m68k)

# define M68K

# define OPENBSD

# define mach_type_known

# endif

# if defined(__OpenBSD__) && defined(__sparc__)

# define SPARC

# define OPENBSD

# define mach_type_known

# endif

# if defined(__NetBSD__) && defined(m68k)

# define M68K

# define NETBSD

# define mach_type_known

# endif

# if defined(__NetBSD__) && defined(arm32)

# define ARM32

# define NETBSD

# define mach_type_known

# endif

# if defined(vax)

# define VAX

# ifdef ultrix

# define ULTRIX

# else

# define BSD

# endif

# define mach_type_known

# endif

# if defined(mips) || defined(__mips)

# define MIPS

# if !defined(LINUX)

# if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)

# define ULTRIX

# else

# if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \

|| defined(__SYSTYPE_SVR4__)

# define IRIX5 /* or IRIX 6.X */

# else

# define RISCOS /* or IRIX 4.X */

# endif

# endif

# endif /* !LINUX */

# define mach_type_known

# endif

# if defined(sequent) && defined(i386)

# define I386

# define SEQUENT

# define mach_type_known

# endif

# if defined(sun) && defined(i386)

# define I386

# define SUNOS5

# define mach_type_known

# endif

# if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)

# define I386

# define OS2

# define mach_type_known

# endif

# if defined(ibm032)

# define RT

# define mach_type_known

# endif

# if defined(sun) && (defined(sparc) || defined(__sparc))

# define SPARC

/* Test for SunOS 5.x */

# include <errno.h>

# ifdef ECHRNG

# define SUNOS5

# else

# define SUNOS4

# endif

# define mach_type_known

# endif

# if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \

&& !defined(__OpenBSD__)

# define SPARC

# define DRSNX

# define mach_type_known

# endif

# if defined(_IBMR2)

# define RS6000

# define mach_type_known

# endif

# if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)

/* The above test may need refinement */

# define I386

# if defined(_SCO_ELF)

# define SCO_ELF

# else

# define SCO

# endif

# define mach_type_known

# endif

# if defined(_AUX_SOURCE)

# define M68K

# define SYSV

# define mach_type_known

# endif

# if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \

|| defined(hppa) || defined(__hppa__)

# define HP_PA

# ifndef LINUX

# define HPUX

# endif

# define mach_type_known

# endif

# if defined(LINUX) && (defined(i386) || defined(__i386__))

# define I386

# define mach_type_known

# endif

# if defined(LINUX) && (defined(__ia64__) || defined(__ia64))

# define IA64

# define mach_type_known

# endif

# if defined(LINUX) && defined(powerpc)

# define POWERPC

# define mach_type_known

# endif

# if defined(LINUX) && defined(__mc68000__)

# define M68K

# define mach_type_known

# endif

# if defined(LINUX) && (defined(sparc) || defined(__sparc__))

# define SPARC

# define mach_type_known

# endif

# if defined(LINUX) && defined(arm)

# define ARM32

# define mach_type_known

# endif

# if defined(__alpha) || defined(__alpha__)

# define ALPHA

# if !defined(LINUX)

# define OSF1 /* a.k.a Digital Unix */

# endif

# define mach_type_known

# endif

# if defined(_AMIGA) && !defined(AMIGA)

# define AMIGA

# endif

# ifdef AMIGA

# define M68K

# define mach_type_known

# endif

# if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)

# define M68K

# define MACOS

# define mach_type_known

# endif

# if defined(__MWERKS__) && defined(__powerc)

# define POWERPC

# define MACOS

# define mach_type_known

# endif

# if defined(macosx)

# define MACOSX

# define POWERPC

# define mach_type_known

# endif

# if defined(NeXT) && defined(mc68000)

# define M68K

# define NEXT

# define mach_type_known

# endif

# if defined(NeXT) && defined(i386)

# define I386

# define NEXT

# define mach_type_known

# endif

# if defined(__OpenBSD__) && defined(i386)

# define I386

# define OPENBSD

# define mach_type_known

# endif

# if defined(__FreeBSD__) && defined(i386)

# define I386

# define FREEBSD

# define mach_type_known

# endif

# if defined(__NetBSD__) && defined(i386)

# define I386

# define NETBSD

# define mach_type_known

# endif

# if defined(bsdi) && defined(i386)

# define I386

# define BSDI

# define mach_type_known

# endif

# if !defined(mach_type_known) && defined(__386BSD__)

# define I386

# define THREE86BSD

# define mach_type_known

# endif

# if defined(_CX_UX) && defined(_M88K)

# define M88K

# define CX_UX

# define mach_type_known

# endif

# if defined(DGUX)

# define M88K

/* DGUX defined */

# define mach_type_known

# endif

# if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \

|| defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)

# define I386

# define MSWIN32 /* or Win32s */

# define mach_type_known

# endif

# if defined(__DJGPP__)

# define I386

# ifndef DJGPP

# define DJGPP /* MSDOS running the DJGPP port of GCC */

# endif

# define mach_type_known

# endif

# if defined(__CYGWIN32__) || defined(__CYGWIN__)

# define I386

# define CYGWIN32

# define mach_type_known

# endif

# if defined(__MINGW32__)

# define I386

# define MSWIN32

# define mach_type_known

# endif

# if defined(__BORLANDC__)

# define I386

# define MSWIN32

# define mach_type_known

# endif

# if defined(_UTS) && !defined(mach_type_known)

# define S370

# define UTS4

# define mach_type_known

# endif

# if defined(__pj__)

# define PJ

# define mach_type_known

# endif

/* Ivan Demakov */

# if defined(__WATCOMC__) && defined(__386__)

# define I386

# if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)

# if defined(__OS2__)

# define OS2

# else

# if defined(__WINDOWS_386__) || defined(__NT__)

# define MSWIN32

# else

# define DOS4GW

# endif

# endif

# endif

# define mach_type_known

# endif

/* Feel free to add more clauses here */

/* Or manually define the machine type here. A machine type is */

/* characterized by the architecture. Some */

/* machine types are further subdivided by OS. */

/* the macros ULTRIX, RISCOS, and BSD to distinguish. */

/* Note that SGI IRIX is treated identically to RISCOS. */

/* SYSV on an M68K actually means A/UX. */

/* The distinction in these cases is usually the stack starting address */

# ifndef mach_type_known

--> unknown machine type

# endif

/* Mapping is: M68K ==> Motorola 680X0 */

/* (SUNOS4,HP,NEXT, and SYSV (A/UX), */

/* MACOS and AMIGA variants) */

/* I386 ==> Intel 386 */

/* (SEQUENT, OS2, SCO, LINUX, NETBSD, */

/* FREEBSD, THREE86BSD, MSWIN32, */

/* BSDI,SUNOS5, NEXT, other variants) */

/* NS32K ==> Encore Multimax */

/* MIPS ==> R2000 or R3000 */

/* (RISCOS, ULTRIX variants) */

/* VAX ==> DEC VAX */

/* (BSD, ULTRIX variants) */

/* RS6000 ==> IBM RS/6000 AIX3.X */

/* RT ==> IBM PC/RT */

/* HP_PA ==> HP9000/700 & /800 */

/* HP/UX */

/* SPARC ==> SPARC under SunOS */

/* (SUNOS4, SUNOS5, */

/* DRSNX variants) */

/* ALPHA ==> DEC Alpha */

/* (OSF1 and LINUX variants) */

/* M88K ==> Motorola 88XX0 */

/* (CX_UX and DGUX) */

/* S370 ==> 370-like machine */

/* running Amdahl UTS4 */

/* ARM32 ==> Intel StrongARM */

/* IA64 ==> Intel IA64 */

/* (e.g. Itanium) */

/*

* For each architecture and OS, the following need to be defined:

*

* CPP_WORD_SZ is a simple integer constant representing the word size.

* in bits. We assume byte addressibility, where a byte has 8 bits.

* We also assume CPP_WORD_SZ is either 32 or 64.

* (We care about the length of pointers, not hardware

* bus widths. Thus a 64 bit processor with a C compiler that uses

* 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)

*

* MACH_TYPE is a string representation of the machine type.

* OS_TYPE is analogous for the OS.

*

* ALIGNMENT is the largest N, such that

* all pointer are guaranteed to be aligned on N byte boundaries.

* defining it to be 1 will always work, but perform poorly.

*

* DATASTART is the beginning of the data segment.

* On UNIX systems, the collector will scan the area between DATASTART

* and DATAEND for root pointers.

*

* DATAEND, if not &end.

*

* ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice

* the pointer size.

*

* STACKBOTTOM is the cool end of the stack, which is usually the

* highest address in the stack.

* Under PCR or OS/2, we have other ways of finding thread stacks.

* For each machine, the following should:

* 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and

* 2) define exactly one of

* STACKBOTTOM (should be defined to be an expression)

* HEURISTIC1

* HEURISTIC2

* If either of the last two macros are defined, then STACKBOTTOM is computed

* during collector startup using one of the following two heuristics:

* HEURISTIC1: Take an address inside GC_init's frame, and round it up to

* the next multiple of STACK_GRAN.

* HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly

* in small steps (decrement if STACK_GROWS_UP), and read the value

* at each location. Remember the value when the first

* Segmentation violation or Bus error is signalled. Round that

* to the nearest plausible page boundary, and use that instead

* of STACKBOTTOM.

*

* Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,

* the value of environ is a pointer that can serve as STACKBOTTOM.

* I expect that HEURISTIC2 can be replaced by this approach, which

* interferes far less with debugging.

*

* If no expression for STACKBOTTOM can be found, and neither of the above

* heuristics are usable, the collector can still be used with all of the above

* undefined, provided one of the following is done:

* 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)

* without reference to STACKBOTTOM. This is appropriate for use in

* conjunction with thread packages, since there will be multiple stacks.

* (Allocating thread stacks in the heap, and treating them as ordinary

* heap data objects is also possible as a last resort. However, this is

* likely to introduce significant amounts of excess storage retention

* unless the dead parts of the thread stacks are periodically cleared.)

* 2) Client code may set GC_stackbottom before calling any GC_ routines.

* If the author of the client code controls the main program, this is

* easily accomplished by introducing a new main program, setting

* GC_stackbottom to the address of a local variable, and then calling

* the original main program. The new main program would read something

* like:

*

* # include "gc_private.h"

*

* main(argc, argv, envp)

* int argc;

* char **argv, **envp;

* {

* int dummy;

*

* GC_stackbottom = (ptr_t)(&dummy);

* return(real_main(argc, argv, envp));

* }

*

*

* Each architecture may also define the style of virtual dirty bit

* implementation to be used:

* MPROTECT_VDB: Write protect the heap and catch faults.

* PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.

*

* An architecture may define DYNAMIC_LOADING if dynamic_load.c

* defined GC_register_dynamic_libraries() for the architecture.

*

* An architecture may define PREFETCH(x) to preload the cache with *x.

* This defaults to a no-op.

*

* PREFETCH_FOR_WRITE(x) is used if *x is about to be written.

*

* An architecture may also define CLEAR_DOUBLE(x) to be a fast way to

* clear the two words at GC_malloc-aligned address x. By default,

* word stores of 0 are used instead.

*/

# define STACK_GRAN 0x1000000

# ifdef M68K

# define MACH_TYPE "M68K"

# define ALIGNMENT 2

# ifdef OPENBSD

# define OS_TYPE "OPENBSD"

# define HEURISTIC2

extern char etext;

# define DATASTART ((ptr_t)(&etext))

# endif

# ifdef NETBSD

# define OS_TYPE "NETBSD"

# define HEURISTIC2

extern char etext;

# define DATASTART ((ptr_t)(&etext))

# endif

# ifdef LINUX

# define OS_TYPE "LINUX"

# define STACKBOTTOM ((ptr_t)0xf0000000)

# define MPROTECT_VDB

# ifdef __ELF__

# define DYNAMIC_LOADING

extern char **__environ;

# define DATASTART ((ptr_t)(&__environ))

/* hideous kludge: __environ is the first */

/* word in crt0.o, and delimits the start */

/* of the data segment, no matter which */

/* ld options were passed through. */

/* We could use _etext instead, but that */

/* would include .rodata, which may */

/* contain large read-only data tables */

/* that we'd rather not scan. */

extern int _end;

# define DATAEND (&_end)

# else

extern int etext;

# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))

# endif

# endif

# ifdef SUNOS4

# define OS_TYPE "SUNOS4"

extern char etext;

# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))

# define HEURISTIC1 /* differs */

# define DYNAMIC_LOADING

# endif

# ifdef HP

# define OS_TYPE "HP"

extern char etext;

# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))

# define STACKBOTTOM ((ptr_t) 0xffeffffc)

/* empirically determined. seems to work. */

# include <unistd.h>

# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)

# endif

# ifdef SYSV

# define OS_TYPE "SYSV"

extern etext;

# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \

& ~0x3fffff) \

+((word)&etext & 0x1fff))

/* This only works for shared-text binaries with magic number 0413.

The other sorts of SysV binaries put the data at the end of the text,

in which case the default of &etext would work. Unfortunately,

handling both would require having the magic-number available.

-- Parag

*/

# define STACKBOTTOM ((ptr_t)0xFFFFFFFE)

/* The stack starts at the top of memory, but */

/* 0x0 cannot be used as setjump_test complains */

/* that the stack direction is incorrect. Two */

/* bytes down from 0x0 should be safe enough. */

/* --Parag */

# include <sys/mmu.h>

# define GETPAGESIZE() PAGESIZE /* Is this still right? */

# endif

# ifdef AMIGA

# define OS_TYPE "AMIGA"

/* STACKBOTTOM and DATASTART handled specially */

/* in os_dep.c */

# define DATAEND /* not needed */

# define GETPAGESIZE() 4096

# endif

# ifdef MACOS

# ifndef __LOWMEM__

# include <LowMem.h>

# endif

# define OS_TYPE "MACOS"

/* see os_dep.c for details of global data segments. */

# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())

# define DATAEND /* not needed */

# define GETPAGESIZE() 4096

# endif

# ifdef NEXT

# define OS_TYPE "NEXT"

# define DATASTART ((ptr_t) get_etext())

# define STACKBOTTOM ((ptr_t) 0x4000000)

# define DATAEND /* not needed */

# endif

# endif

# ifdef POWERPC

# define MACH_TYPE "POWERPC"

# ifdef MACOS

# define ALIGNMENT 2 /* Still necessary? Could it be 4? */

# ifndef __LOWMEM__

# include <LowMem.h>

# endif

# define OS_TYPE "MACOS"

/* see os_dep.c for details of global data segments. */

# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())

# define DATAEND /* not needed */

# endif

# ifdef LINUX

# define ALIGNMENT 4 /* Guess. Can someone verify? */

/* This was 2, but that didn't sound right. */

# define OS_TYPE "LINUX"

# define HEURISTIC1

# define DYNAMIC_LOADING

# undef STACK_GRAN

# define STACK_GRAN 0x10000000

/* Stack usually starts at 0x80000000 */

# define LINUX_DATA_START

extern int _end;

# define DATAEND (&_end)

# endif

# ifdef MACOSX

# define ALIGNMENT 4

# define OS_TYPE "MACOSX"

# define DATASTART ((ptr_t) get_etext())

# define STACKBOTTOM ((ptr_t) 0xc0000000)

# define DATAEND /* not needed */

# endif

# endif

# ifdef VAX

# define MACH_TYPE "VAX"

# define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */

extern char etext;

# define DATASTART ((ptr_t)(&etext))

# ifdef BSD

# define OS_TYPE "BSD"

# define HEURISTIC1

/* HEURISTIC2 may be OK, but it's hard to test. */

# endif

# ifdef ULTRIX

# define OS_TYPE "ULTRIX"

# define STACKBOTTOM ((ptr_t) 0x7fffc800)

# endif

# endif

# ifdef RT

# define MACH_TYPE "RT"

# define ALIGNMENT 4

# define DATASTART ((ptr_t) 0x10000000)

# define STACKBOTTOM ((ptr_t) 0x1fffd800)

# endif

# ifdef SPARC

# define MACH_TYPE "SPARC"

# define ALIGNMENT 4 /* Required by hardware */

# define ALIGN_DOUBLE

extern int etext;

# ifdef SUNOS5

# define OS_TYPE "SUNOS5"

extern int _etext;

extern int _end;

extern char * GC_SysVGetDataStart();

# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)

# define DATAEND (&_end)

# ifndef USE_MMAP

# define USE_MMAP

# endif

# ifdef USE_MMAP

# define HEAP_START (ptr_t)0x40000000

# else

# define HEAP_START DATAEND

# endif

# define PROC_VDB

/* HEURISTIC1 reportedly no longer works under 2.7. Thus we */

/* switched to HEURISTIC2, eventhough it creates some debugging */

/* issues. */

# define HEURISTIC2

# include <unistd.h>

# define GETPAGESIZE() sysconf(_SC_PAGESIZE)

/* getpagesize() appeared to be missing from at least one */

/* Solaris 5.4 installation. Weird. */

# define DYNAMIC_LOADING

# endif

# ifdef SUNOS4

# define OS_TYPE "SUNOS4"

/* [If you have a weak stomach, don't read this.] */

/* We would like to use: */

/* # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */

/* This fails occasionally, due to an ancient, but very */

/* persistent ld bug. &etext is set 32 bytes too high. */

/* We instead read the text segment size from the a.out */

/* header, which happens to be mapped into our address space */

/* at the start of the text segment. The detective work here */

/* was done by Robert Ehrlich, Manuel Serrano, and Bernard */

/* Serpette of INRIA. */

/* This assumes ZMAGIC, i.e. demand-loadable executables. */

# define TEXTSTART 0x2000

# define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))

# define MPROTECT_VDB

# define HEURISTIC1

# define DYNAMIC_LOADING

# endif

# ifdef DRSNX

# define CPP_WORDSZ 32

# define OS_TYPE "DRSNX"

extern char * GC_SysVGetDataStart();

extern int etext;

# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)

# define MPROTECT_VDB

# define STACKBOTTOM ((ptr_t) 0xdfff0000)

# define DYNAMIC_LOADING

# endif

# ifdef LINUX

# define OS_TYPE "LINUX"

# ifdef __ELF__

# define LINUX_DATA_START

# define DYNAMIC_LOADING

# else

Linux Sparc non elf ?

# endif

extern int _end;

# define DATAEND (&_end)

# define SVR4

# define STACKBOTTOM ((ptr_t) 0xf0000000)

# endif

# ifdef OPENBSD

# define OS_TYPE "OPENBSD"

# define STACKBOTTOM ((ptr_t) 0xf8000000)

# define DATASTART ((ptr_t)(&etext))

# endif

# endif

# ifdef I386

# define MACH_TYPE "I386"

# define ALIGNMENT 4 /* Appears to hold for all "32 bit" compilers */

/* except Borland. The -a4 option fixes */

/* Borland. */

/* Ivan Demakov: For Watcom the option is -zp4. */

# ifndef SMALL_CONFIG

# define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */

/* improvement on Pentiums. */

# endif

# ifdef SEQUENT

# define OS_TYPE "SEQUENT"

extern int etext;

# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))

# define STACKBOTTOM ((ptr_t) 0x3ffff000)

# endif

# ifdef SUNOS5

# define OS_TYPE "SUNOS5"

extern int etext, _start;

extern char * GC_SysVGetDataStart();

# define DATASTART GC_SysVGetDataStart(0x1000, &etext)

# define STACKBOTTOM ((ptr_t)(&_start))

/** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */

/*# define PROC_VDB*/

# define DYNAMIC_LOADING

# ifndef USE_MMAP

# define USE_MMAP

# endif

# ifdef USE_MMAP

# define HEAP_START (ptr_t)0x40000000

# else

# define HEAP_START DATAEND

# endif

# endif

# ifdef SCO

# define OS_TYPE "SCO"

extern int etext;

# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \

& ~0x3fffff) \

+((word)&etext & 0xfff))

# define STACKBOTTOM ((ptr_t) 0x7ffffffc)

# endif

# ifdef SCO_ELF

# define OS_TYPE "SCO_ELF"

extern int etext;

# define DATASTART ((ptr_t)(&etext))

# define STACKBOTTOM ((ptr_t) 0x08048000)

# define DYNAMIC_LOADING

# define ELF_CLASS ELFCLASS32

# endif

# ifdef LINUX

# define OS_TYPE "LINUX"

# define LINUX_STACKBOTTOM

# if 0

# define HEURISTIC1

# undef STACK_GRAN

# define STACK_GRAN 0x10000000

/* STACKBOTTOM is usually 0xc0000000, but this changes with */

/* different kernel configurations. In particular, systems */

/* with 2GB physical memory will usually move the user */

/* address space limit, and hence initial SP to 0x80000000. */

# endif

# if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)

# define MPROTECT_VDB

# else

/* We seem to get random errors in incremental mode, */

/* possibly because Linux threads is itself a malloc client */

/* and can't deal with the signals. */

# endif

# ifdef __ELF__

# define DYNAMIC_LOADING

# ifdef UNDEFINED /* includes ro data */

extern int _etext;

# define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))

# endif

# include <features.h>

# if defined(__GLIBC__) && __GLIBC__ >= 2

# define LINUX_DATA_START

# else

extern char **__environ;

# define DATASTART ((ptr_t)(&__environ))

/* hideous kludge: __environ is the first */

/* word in crt0.o, and delimits the start */

/* of the data segment, no matter which */

/* ld options were passed through. */

/* We could use _etext instead, but that */

/* would include .rodata, which may */

/* contain large read-only data tables */

/* that we'd rather not scan. */

# endif

extern int _end;

# define DATAEND (&_end)

# else

extern int etext;

# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))

# endif

# ifdef USE_I686_PREFETCH

# define PREFETCH(x) \

__asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))

/* Empirically prefetcht0 is much more effective at reducing */

/* cache miss stalls for the targetted load instructions. But it */

/* seems to interfere enough with other cache traffic that the net */

/* result is worse than prefetchnta. */

# if 0

/* Using prefetches for write seems to have a slight negative */

/* impact on performance, at least for a PIII/500. */

# define PREFETCH_FOR_WRITE(x) \

__asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))

# endif

# endif

# ifdef USE_3DNOW_PREFETCH

# define PREFETCH(x) \

__asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))

# define PREFETCH_FOR_WRITE(x)

__asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))

# endif

# endif

# ifdef CYGWIN32

# define OS_TYPE "CYGWIN32"

extern int _data_start__;

extern int _data_end__;

extern int _bss_start__;

extern int _bss_end__;

/* For binutils 2.9.1, we have */

/* DATASTART = _data_start__ */

/* DATAEND = _bss_end__ */

/* whereas for some earlier versions it was */

/* DATASTART = _bss_start__ */

/* DATAEND = _data_end__ */

/* To get it right for both, we take the */

/* minumum/maximum of the two. */

# define MAX(x,y) ((x) > (y) ? (x) : (y))

# define MIN(x,y) ((x) < (y) ? (x) : (y))

# define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))

# define DATAEND ((ptr_t) MAX(&_data_end__, &_bss_end__))

# undef STACK_GRAN

# define STACK_GRAN 0x10000

# define HEURISTIC1

# endif

# ifdef OS2

# define OS_TYPE "OS2"

/* STACKBOTTOM and DATASTART are handled specially in */

/* os_dep.c. OS2 actually has the right */

/* system call! */

# define DATAEND /* not needed */

# endif

# ifdef MSWIN32

# define OS_TYPE "MSWIN32"

/* STACKBOTTOM and DATASTART are handled specially in */

/* os_dep.c. */

# ifndef __WATCOMC__

# define MPROTECT_VDB

# endif

# define DATAEND /* not needed */

# endif

# ifdef DJGPP

# define OS_TYPE "DJGPP"

# include "stubinfo.h"

extern int etext;

extern int _stklen;

extern int __djgpp_stack_limit;

# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))

/* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \

+ _stklen)) */

# define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))

/* This may not be right. */

# endif

# ifdef OPENBSD

# define OS_TYPE "OPENBSD"

# endif

# ifdef FREEBSD

# define OS_TYPE "FREEBSD"

# define MPROTECT_VDB

# endif

# ifdef NETBSD

# define OS_TYPE "NETBSD"

# endif

# ifdef THREE86BSD

# define OS_TYPE "THREE86BSD"

# endif

# ifdef BSDI

# define OS_TYPE "BSDI"

# endif

# if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \

|| defined(THREE86BSD) || defined(BSDI)

# define HEURISTIC2

extern char etext;

# define DATASTART ((ptr_t)(&etext))

# endif

# ifdef NEXT

# define OS_TYPE "NEXT"

# define DATASTART ((ptr_t) get_etext())

# define STACKBOTTOM ((ptr_t)0xc0000000)

# define DATAEND /* not needed */

# endif

# ifdef DOS4GW

# define OS_TYPE "DOS4GW"

extern long __nullarea;

extern char _end;

extern char *_STACKTOP;

/* Depending on calling conventions Watcom C either precedes

or does not precedes with undescore names of C-variables.

Make sure startup code variables always have the same names. */

#pragma aux __nullarea "*";

#pragma aux _end "*";

# define STACKBOTTOM ((ptr_t) _STACKTOP)

/* confused? me too. */

# define DATASTART ((ptr_t) &__nullarea)

# define DATAEND ((ptr_t) &_end)

# endif

# endif

# ifdef NS32K

# define MACH_TYPE "NS32K"

# define ALIGNMENT 4

extern char **environ;

# define DATASTART ((ptr_t)(&environ))

/* hideous kludge: environ is the first */

/* word in crt0.o, and delimits the start */

/* of the data segment, no matter which */

/* ld options were passed through. */

# define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */

# endif

# ifdef MIPS

# define MACH_TYPE "MIPS"

/* # define STACKBOTTOM ((ptr_t)0x7fff8000) sometimes also works. */

# ifdef LINUX

/* This was developed for a linuxce style platform. Probably */

/* needs to be tweaked for workstation class machines. */

# define OS_TYPE "LINUX"

extern int __data_start;

# define DATASTART ((ptr_t)(&__data_start))

# define ALIGNMENT 4

# define USE_GENERIC_PUSH_REGS 1

# define STACKBOTTOM 0x80000000

/* In many cases, this should probably use LINUX_STACKBOTTOM */

/* instead. But some kernel versions seem to give the wrong */

/* value from /proc. */

# endif /* Linux */

# ifdef ULTRIX

# define HEURISTIC2

# define DATASTART (ptr_t)0x10000000

/* Could probably be slightly higher since */

/* startup code allocates lots of stuff. */

# define OS_TYPE "ULTRIX"

# define ALIGNMENT 4

# endif

# ifdef RISCOS

# define HEURISTIC2

# define DATASTART (ptr_t)0x10000000

# define OS_TYPE "RISCOS"

# define ALIGNMENT 4 /* Required by hardware */

# endif

# ifdef IRIX5

# define HEURISTIC2

extern int _fdata;

# define DATASTART ((ptr_t)(&_fdata))

# ifdef USE_MMAP

# define HEAP_START (ptr_t)0x30000000

# else

# define HEAP_START DATASTART

# endif

/* Lowest plausible heap address. */

/* In the MMAP case, we map there. */

/* In either case it is used to identify */

/* heap sections so they're not */

/* considered as roots. */

# define OS_TYPE "IRIX5"

# define MPROTECT_VDB

# ifdef _MIPS_SZPTR

# define CPP_WORDSZ _MIPS_SZPTR

# define ALIGNMENT (_MIPS_SZPTR/8)

# if CPP_WORDSZ != 64

# define ALIGN_DOUBLE

# endif

# else

# define ALIGNMENT 4

# define ALIGN_DOUBLE

# endif

# define DYNAMIC_LOADING

# endif

# endif

# ifdef RS6000

# define MACH_TYPE "RS6000"

# define ALIGNMENT 4

# define DATASTART ((ptr_t)0x20000000)

extern int errno;

# define STACKBOTTOM ((ptr_t)((ulong)&errno))

# define DYNAMIC_LOADING

/* For really old versions of AIX, this may have to be removed. */

# endif

# ifdef HP_PA

/* OS is assumed to be HP/UX */

# define MACH_TYPE "HP_PA"

# define OS_TYPE "HPUX"

# ifdef __LP64__

# define CPP_WORDSZ 64

# define ALIGNMENT 8

# else

# define CPP_WORDSZ 32

# define ALIGNMENT 4

# define ALIGN_DOUBLE

# endif

extern int __data_start;

# define DATASTART ((ptr_t)(&__data_start))

# if 0

/* The following appears to work for 7xx systems running HP/UX */

/* 9.xx Furthermore, it might result in much faster */

/* collections than HEURISTIC2, which may involve scanning */

/* segments that directly precede the stack. It is not the */

/* default, since it may not work on older machine/OS */

/* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */

/* this.) */

# define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */

# else

/* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */

/* to this. We'll probably do this on other platforms, too. */