/* * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers * Copyright (c) 1991-1994 by Xerox Corporation. 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. */ /* Boehm, October 3, 1995 6:39 pm PDT */ #ifndef CONFIG_H # define CONFIG_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. */ /* 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(__NetBSD__) && defined(m68k) # define M68K # 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(ultrix) || defined(__ultrix) # define ULTRIX # else # if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4__) # define IRIX5 # else # define RISCOS /* or IRIX 4.X */ # endif # endif # 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) # 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 # define SCO # 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) # define HP_PA # define mach_type_known # endif # if defined(linux) && defined(i386) # define I386 # define LINUX # define mach_type_known # endif # if defined(__alpha) # define ALPHA # define mach_type_known # endif # if defined(_AMIGA) # define M68K # define AMIGA # 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(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(__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) && (_M_IX86 == 300) || (_M_IX86 == 400) # define I386 # define MSWIN32 /* or Win32s */ # define mach_type_known # endif # if defined(GO32) # define I386 # define DJGPP /* MSDOS running the DJGPP port of GCC */ # define mach_type_known # endif # if defined(__BORLANDC__) # define I386 # define MSWIN32 # 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 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 OSF/1 */ /* M88K ==> Motorola 88XX0 */ /* (CX_UX and DGUX) */ /* * 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 &end for root pointers. * * 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. * * 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. */ # define STACK_GRAN 0x1000000 # ifdef M68K # define MACH_TYPE "M68K" # define ALIGNMENT 2 # ifdef NETBSD # define OS_TYPE "NETBSD" # define HEURISTIC2 extern char etext; # define DATASTART ((ptr_t)(&etext)) # 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. */ # 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 */ # endif # ifdef AMIGA # define OS_TYPE "AMIGA" /* STACKBOTTOM and DATASTART handled specially */ /* in os_dep.c */ # define DATAEND /* not needed */ # 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 */ # 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" # define ALIGNMENT 2 # 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 */ # 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 */ 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) # define PROC_VDB # define HEURISTIC1 # 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 # 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) # endif # define DYNAMIC_LOADING # 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. */ # 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)) # define PROC_VDB # 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 LINUX # define OS_TYPE "LINUX" extern int etext; # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff)) # define STACKBOTTOM ((ptr_t)0xc0000000) # define MPROTECT_VDB # 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. */ # define MPROTECT_VDB # define DATAEND /* not needed */ # endif # ifdef DJGPP # define OS_TYPE "DJGPP" extern int etext; # define DATASTART ((ptr_t)(&etext)) # define STACKBOTTOM ((ptr_t)0x00080000) # 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(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 # 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 ALIGNMENT 4 /* Required by hardware */ # define DATASTART 0x10000000 /* Could probably be slightly higher since */ /* startup code allocates lots of junk */ # define HEURISTIC2 # ifdef ULTRIX # define OS_TYPE "ULTRIX" # endif # ifdef RISCOS # define OS_TYPE "RISCOS" # endif # ifdef IRIX5 # define OS_TYPE "IRIX5" # define MPROTECT_VDB /* The above is dubious. Mprotect and signals do work, */ /* and dirty bits are implemented under IRIX5. But, */ /* at least under IRIX5.2, mprotect seems to be so */ /* slow relative to the hardware that incremental */ /* collection is likely to be rarely useful. */ # define DYNAMIC_LOADING # endif # endif # ifdef RS6000 # define MACH_TYPE "RS6000" # define ALIGNMENT 4 # define DATASTART ((ptr_t)0x20000000) # define STACKBOTTOM ((ptr_t)0x2ff80000) # endif # ifdef HP_PA # define MACH_TYPE "HP_PA" # define ALIGNMENT 4 extern int __data_start; # define DATASTART ((ptr_t)(&__data_start)) # define HEURISTIC2 # define STACK_GROWS_UP # endif # ifdef ALPHA # define MACH_TYPE "ALPHA" # define ALIGNMENT 8 # define DATASTART ((ptr_t) 0x140000000) # define HEURISTIC2 /* Normally HEURISTIC2 is too conervative, since */ /* the text segment immediately follows the stack. */ /* Hence we give an upper pound. */ extern __start; # define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1))) # define CPP_WORDSZ 64 # define MPROTECT_VDB # define DYNAMIC_LOADING # endif # ifdef M88K # define MACH_TYPE "M88K" # define ALIGNMENT 4 # ifdef CX_UX # define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000) # endif # ifdef DGUX extern char * GC_SysVGetDataStart(); # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext) # endif # define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */ # 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(SUNOS5) || defined(DRSNX) /* 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 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 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB) # define DEFAULT_VDB # endif # if defined(SPARC) # define SAVE_CALL_CHAIN # endif # endif