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("sweep_card"): don't count scm_tc_free_cell for
[bpt/guile.git] / libguile / gc_os_dep.c
CommitLineData
155415a5
MV		 1/*
2 * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
3 * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
4 * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
5 * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
083ff995 6 * Copyright (c) 2000, 2001, 2002, 2003, 2004 Free Software Foundation
155415a5
MV		 7 *
8 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
9 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
10 *
11 * Permission is hereby granted to use or copy this program
12 * for any purpose, provided the above notices are retained on all copies.
13 * Permission to modify the code and to distribute modified code is granted,
14 * provided the above notices are retained, and a notice that the code was
15 * modified is included with the above copyright notice.
16 *
17 */
9500b5b9 18
155415a5 19/*
a3487916 20 * Copied from gc5.2, files "os_dep.c", "gc_priv.h", "mark.c" and "gcconfig.h",
9ec1e770 21 * and modified for Guile by Marius Vollmer.
155415a5 22 */
9500b5b9 23
2485c279
RB		 24#if HAVE_CONFIG_H
25# include <config.h>
26#endif
27
155415a5
MV		 28#include <ctype.h>
29#include "libguile/gc.h"
8cbb63c7
MV		 30#include "libguile/scmconfig.h"
31
32#ifdef HAVE_LIBC_STACK_END
33
34extern void *__libc_stack_end;
35
36void *
37scm_get_stack_base ()
38{
39 return __libc_stack_end;
40}
41
42#else
155415a5
MV		 43
44#define ABORT(msg) abort ()
45
46typedef char * ptr_t; /* A generic pointer to which we can add */
47 /* byte displacements. */
48 /* Preferably identical to caddr_t, if it */
49 /* exists. */
50
51/* Define word and signed_word to be unsigned and signed types of the */
52/* size as char * or void *. There seems to be no way to do this */
53/* even semi-portably. The following is probably no better/worse */
54/* than almost anything else. */
55/* The ANSI standard suggests that size_t and ptr_diff_t might be */
56/* better choices. But those appear to have incorrect definitions */
57/* on may systems. Notably "typedef int size_t" seems to be both */
58/* frequent and WRONG. */
59typedef unsigned long GC_word;
60typedef long GC_signed_word;
61
62typedef GC_word word;
63typedef GC_signed_word signed_word;
64
a3487916
MV		 65typedef int GC_bool;
66# define TRUE 1
67# define FALSE 0
68
69#if defined(__STDC__)
70# include <stdlib.h>
71# if !(defined( sony_news ) )
72# include <stddef.h>
73# endif
74# define VOLATILE volatile
75#else
76# ifdef MSWIN32
77# include <stdlib.h>
78# endif
79# define VOLATILE
80#endif
81
155415a5
MV		 82/* Machine dependent parameters. Some tuning parameters can be found */
83/* near the top of gc_private.h. */
84
85/* Machine specific parts contributed by various people. See README file. */
86
87/* First a unified test for Linux: */
88# if defined(linux) || defined(__linux__)
89# define LINUX
90# endif
91
92/* Determine the machine type: */
93# if defined(sun) && defined(mc68000)
94# define M68K
95# define SUNOS4
96# define mach_type_known
97# endif
98# if defined(hp9000s300)
99# define M68K
100# define HP
101# define mach_type_known
102# endif
103# if defined(__OpenBSD__) && defined(m68k)
104# define M68K
105# define OPENBSD
106# define mach_type_known
107# endif
108# if defined(__OpenBSD__) && defined(__sparc__)
109# define SPARC
110# define OPENBSD
111# define mach_type_known
112# endif
9534300a
RB		 113# if defined(__NetBSD__) && defined(__powerpc__)
114# define POWERPC
115# define NETBSD
116# define mach_type_known
117# endif
083ff995
KR		 118/* in netbsd 2.0 only __m68k__ is defined, not m68k */
119# if defined(__NetBSD__) && (defined(m68k) || defined(__m68k__))
155415a5
MV		 120# define M68K
121# define NETBSD
122# define mach_type_known
123# endif
083ff995
KR		 124/* in netbsd 2.0 only __arm__ is defined, not arm32 */
125# if defined(__NetBSD__) && (defined(arm32) || defined(__arm__))
155415a5
MV		 126# define ARM32
127# define NETBSD
128# define mach_type_known
129# endif
598b6787
MV		 130# if defined(__NetBSD__) && defined(__sparc__)
131# define SPARC
132# define NETBSD
133# define mach_type_known
134# endif
155415a5
MV		 135# if defined(vax)
136# define VAX
137# ifdef ultrix
138# define ULTRIX
139# else
140# define BSD
141# endif
142# define mach_type_known
143# endif
144# if defined(mips) || defined(__mips)
145# define MIPS
146# if !defined(LINUX)
147# if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)
148# define ULTRIX
149# else
150# if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \
151 || defined(__SYSTYPE_SVR4__)
152# define IRIX5 /* or IRIX 6.X */
153# else
154# define RISCOS /* or IRIX 4.X */
155# endif
156# endif
157# endif /* !LINUX */
158# define mach_type_known
159# endif
160# if defined(sequent) && defined(i386)
161# define I386
162# define SEQUENT
163# define mach_type_known
164# endif
165# if defined(sun) && defined(i386)
166# define I386
167# define SUNOS5
168# define mach_type_known
169# endif
170# if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
171# define I386
172# define OS2
173# define mach_type_known
174# endif
175# if defined(ibm032)
176# define RT
177# define mach_type_known
178# endif
179# if defined(sun) && (defined(sparc) || defined(__sparc))
180# define SPARC
181 /* Test for SunOS 5.x */
182# include <errno.h>
183# ifdef ECHRNG
184# define SUNOS5
185# else
186# define SUNOS4
187# endif
188# define mach_type_known
189# endif
190# if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
191 && !defined(__OpenBSD__)
192# define SPARC
193# define DRSNX
194# define mach_type_known
195# endif
196# if defined(_IBMR2)
197# define RS6000
198# define mach_type_known
199# endif
200# if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
201 /* The above test may need refinement */
202# define I386
203# if defined(_SCO_ELF)
204# define SCO_ELF
205# else
206# define SCO
207# endif
208# define mach_type_known
209# endif
210# if defined(_AUX_SOURCE)
211# define M68K
212# define SYSV
213# define mach_type_known
214# endif
215# if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
216 || defined(hppa) || defined(__hppa__)
217# define HP_PA
218# ifndef LINUX
219# define HPUX
220# endif
221# define mach_type_known
222# endif
223# if defined(LINUX) && (defined(i386) || defined(__i386__))
224# define I386
225# define mach_type_known
226# endif
227# if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
228# define IA64
229# define mach_type_known
230# endif
231# if defined(LINUX) && defined(powerpc)
232# define POWERPC
233# define mach_type_known
234# endif
235# if defined(LINUX) && defined(__mc68000__)
236# define M68K
237# define mach_type_known
238# endif
239# if defined(LINUX) && (defined(sparc) || defined(__sparc__))
240# define SPARC
241# define mach_type_known
242# endif
311daf8b 243# if defined(LINUX) && (defined(arm) || defined (__arm__))
155415a5
MV		 244# define ARM32
245# define mach_type_known
246# endif
247# if defined(__alpha) || defined(__alpha__)
248# define ALPHA
249# if !defined(LINUX)
250# define OSF1 /* a.k.a Digital Unix */
251# endif
252# define mach_type_known
253# endif
254# if defined(_AMIGA) && !defined(AMIGA)
255# define AMIGA
256# endif
9ec1e770 257# ifdef AMIGA
155415a5
MV		 258# define M68K
259# define mach_type_known
260# endif
261# if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
262# define M68K
263# define MACOS
264# define mach_type_known
265# endif
266# if defined(__MWERKS__) && defined(__powerc)
267# define POWERPC
268# define MACOS
269# define mach_type_known
270# endif
537abaae
RB		 271# if defined(macosx) || \
272 (defined(__APPLE__) && defined(__MACH__) && defined(__ppc__))
155415a5
MV		 273# define MACOSX
274# define POWERPC
275# define mach_type_known
276# endif
277# if defined(NeXT) && defined(mc68000)
278# define M68K
279# define NEXT
280# define mach_type_known
281# endif
282# if defined(NeXT) && defined(i386)
283# define I386
284# define NEXT
285# define mach_type_known
286# endif
37354cb7 287# if defined(__OpenBSD__) && (defined(i386) || defined(__i386__))
155415a5
MV		 288# define I386
289# define OPENBSD
290# define mach_type_known
291# endif
292# if defined(__FreeBSD__) && defined(i386)
293# define I386
294# define FREEBSD
295# define mach_type_known
296# endif
297# if defined(__NetBSD__) && defined(i386)
298# define I386
299# define NETBSD
300# define mach_type_known
301# endif
302# if defined(bsdi) && defined(i386)
303# define I386
304# define BSDI
305# define mach_type_known
306# endif
307# if !defined(mach_type_known) && defined(__386BSD__)
308# define I386
309# define THREE86BSD
310# define mach_type_known
311# endif
312# if defined(_CX_UX) && defined(_M88K)
313# define M88K
314# define CX_UX
315# define mach_type_known
316# endif
317# if defined(DGUX)
318# define M88K
319 /* DGUX defined */
320# define mach_type_known
321# endif
322# if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
323 || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
324# define I386
325# define MSWIN32 /* or Win32s */
326# define mach_type_known
327# endif
328# if defined(__DJGPP__)
329# define I386
330# ifndef DJGPP
331# define DJGPP /* MSDOS running the DJGPP port of GCC */
332# endif
333# define mach_type_known
334# endif
335# if defined(__CYGWIN32__) || defined(__CYGWIN__)
336# define I386
337# define CYGWIN32
338# define mach_type_known
339# endif
340# if defined(__MINGW32__)
341# define I386
342# define MSWIN32
343# define mach_type_known
344# endif
345# if defined(__BORLANDC__)
346# define I386
347# define MSWIN32
348# define mach_type_known
349# endif
350# if defined(_UTS) && !defined(mach_type_known)
351# define S370
352# define UTS4
353# define mach_type_known
354# endif
355# if defined(__pj__)
356# define PJ
357# define mach_type_known
358# endif
359/* Ivan Demakov */
360# if defined(__WATCOMC__) && defined(__386__)
361# define I386
362# if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
363# if defined(__OS2__)
364# define OS2
365# else
366# if defined(__WINDOWS_386__) || defined(__NT__)
367# define MSWIN32
368# else
369# define DOS4GW
370# endif
371# endif
372# endif
373# define mach_type_known
374# endif
683a2f9a
RB		 375# if defined(__s390__) && defined(LINUX)
376# define S370
377# define mach_type_known
378# endif
9c52b218
RB		 379# if defined(__GNU__)
380# define I386
381# define GNU
382# define mach_type_known
383# endif
f55a171d
RB		 384# if defined(__SCO_VERSION__)
385# define I386
386# define SYSV
387# define mach_type_known
388# endif
155415a5
MV		 389
390/* Feel free to add more clauses here */
391
392/* Or manually define the machine type here. A machine type is */
393/* characterized by the architecture. Some */
394/* machine types are further subdivided by OS. */
395/* the macros ULTRIX, RISCOS, and BSD to distinguish. */
396/* Note that SGI IRIX is treated identically to RISCOS. */
397/* SYSV on an M68K actually means A/UX. */
398/* The distinction in these cases is usually the stack starting address */
399# ifndef mach_type_known
fbff94c9
MV		 400
401void *
402scm_get_stack_base ()
403{
404 return NULL;
405}
406
407# else
155415a5
MV		 408 /* Mapping is: M68K ==> Motorola 680X0 */
409 /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
410 /* MACOS and AMIGA variants) */
411 /* I386 ==> Intel 386 */
412 /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
413 /* FREEBSD, THREE86BSD, MSWIN32, */
414 /* BSDI,SUNOS5, NEXT, other variants) */
415 /* NS32K ==> Encore Multimax */
416 /* MIPS ==> R2000 or R3000 */
417 /* (RISCOS, ULTRIX variants) */
418 /* VAX ==> DEC VAX */
419 /* (BSD, ULTRIX variants) */
420 /* RS6000 ==> IBM RS/6000 AIX3.X */
421 /* RT ==> IBM PC/RT */
422 /* HP_PA ==> HP9000/700 & /800 */
423 /* HP/UX */
424 /* SPARC ==> SPARC under SunOS */
425 /* (SUNOS4, SUNOS5, */
426 /* DRSNX variants) */
427 /* ALPHA ==> DEC Alpha */
428 /* (OSF1 and LINUX variants) */
429 /* M88K ==> Motorola 88XX0 */
430 /* (CX_UX and DGUX) */
431 /* S370 ==> 370-like machine */
432 /* running Amdahl UTS4 */
433 /* ARM32 ==> Intel StrongARM */
434 /* IA64 ==> Intel IA64 */
435 /* (e.g. Itanium) */
436
437
438/*
439 * For each architecture and OS, the following need to be defined:
440 *
441 * CPP_WORD_SZ is a simple integer constant representing the word size.
442 * in bits. We assume byte addressibility, where a byte has 8 bits.
443 * We also assume CPP_WORD_SZ is either 32 or 64.
444 * (We care about the length of pointers, not hardware
445 * bus widths. Thus a 64 bit processor with a C compiler that uses
446 * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
447 *
448 * MACH_TYPE is a string representation of the machine type.
449 * OS_TYPE is analogous for the OS.
450 *
451 * ALIGNMENT is the largest N, such that
452 * all pointer are guaranteed to be aligned on N byte boundaries.
453 * defining it to be 1 will always work, but perform poorly.
454 *
455 * DATASTART is the beginning of the data segment.
456 * On UNIX systems, the collector will scan the area between DATASTART
457 * and DATAEND for root pointers.
458 *
459 * DATAEND, if not &end.
460 *
461 * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
462 * the pointer size.
463 *
464 * STACKBOTTOM is the cool end of the stack, which is usually the
465 * highest address in the stack.
466 * Under PCR or OS/2, we have other ways of finding thread stacks.
467 * For each machine, the following should:
2485c279 468 * 1) define SCM_STACK_GROWS_UP if the stack grows toward higher addresses, and
155415a5
MV		 469 * 2) define exactly one of
470 * STACKBOTTOM (should be defined to be an expression)
471 * HEURISTIC1
472 * HEURISTIC2
473 * If either of the last two macros are defined, then STACKBOTTOM is computed
474 * during collector startup using one of the following two heuristics:
475 * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
476 * the next multiple of STACK_GRAN.
477 * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
2485c279 478 * in small steps (decrement if SCM_STACK_GROWS_UP), and read the value
155415a5
MV		 479 * at each location. Remember the value when the first
480 * Segmentation violation or Bus error is signalled. Round that
481 * to the nearest plausible page boundary, and use that instead
482 * of STACKBOTTOM.
483 *
484 * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
485 * the value of environ is a pointer that can serve as STACKBOTTOM.
486 * I expect that HEURISTIC2 can be replaced by this approach, which
9ec1e770 487 * interferes far less with debugging.
155415a5
MV		 488 *
489 * If no expression for STACKBOTTOM can be found, and neither of the above
490 * heuristics are usable, the collector can still be used with all of the above
491 * undefined, provided one of the following is done:
492 * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
493 * without reference to STACKBOTTOM. This is appropriate for use in
494 * conjunction with thread packages, since there will be multiple stacks.
495 * (Allocating thread stacks in the heap, and treating them as ordinary
496 * heap data objects is also possible as a last resort. However, this is
497 * likely to introduce significant amounts of excess storage retention
498 * unless the dead parts of the thread stacks are periodically cleared.)
499 * 2) Client code may set GC_stackbottom before calling any GC_ routines.
500 * If the author of the client code controls the main program, this is
501 * easily accomplished by introducing a new main program, setting
502 * GC_stackbottom to the address of a local variable, and then calling
503 * the original main program. The new main program would read something
504 * like:
505 *
506 * # include "gc_private.h"
507 *
508 * main(argc, argv, envp)
509 * int argc;
510 * char **argv, **envp;
511 * {
512 * int dummy;
513 *
514 * GC_stackbottom = (ptr_t)(&dummy);
515 * return(real_main(argc, argv, envp));
516 * }
517 *
518 *
519 * Each architecture may also define the style of virtual dirty bit
520 * implementation to be used:
521 * MPROTECT_VDB: Write protect the heap and catch faults.
522 * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
523 *
524 * An architecture may define DYNAMIC_LOADING if dynamic_load.c
525 * defined GC_register_dynamic_libraries() for the architecture.
526 *
527 * An architecture may define PREFETCH(x) to preload the cache with *x.
528 * This defaults to a no-op.
529 *
530 * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
531 *
532 * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
533 * clear the two words at GC_malloc-aligned address x. By default,
534 * word stores of 0 are used instead.
535 */
536
537
538# define STACK_GRAN 0x1000000
539# ifdef M68K
540# define MACH_TYPE "M68K"
541# define ALIGNMENT 2
542# ifdef OPENBSD
543# define OS_TYPE "OPENBSD"
544# define HEURISTIC2
545 extern char etext;
546# define DATASTART ((ptr_t)(&etext))
547# endif
548# ifdef NETBSD
549# define OS_TYPE "NETBSD"
550# define HEURISTIC2
551 extern char etext;
552# define DATASTART ((ptr_t)(&etext))
553# endif
554# ifdef LINUX
555# define OS_TYPE "LINUX"
556# define STACKBOTTOM ((ptr_t)0xf0000000)
557# define MPROTECT_VDB
558# ifdef __ELF__
559# define DYNAMIC_LOADING
560 extern char **__environ;
561# define DATASTART ((ptr_t)(&__environ))
562 /* hideous kludge: __environ is the first */
563 /* word in crt0.o, and delimits the start */
564 /* of the data segment, no matter which */
565 /* ld options were passed through. */
566 /* We could use _etext instead, but that */
567 /* would include .rodata, which may */
568 /* contain large read-only data tables */
569 /* that we'd rather not scan. */
570 extern int _end;
571# define DATAEND (&_end)
572# else
573 extern int etext;
574# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
575# endif
576# endif
577# ifdef SUNOS4
578# define OS_TYPE "SUNOS4"
579 extern char etext;
580# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
581# define HEURISTIC1 /* differs */
582# define DYNAMIC_LOADING
583# endif
584# ifdef HP
585# define OS_TYPE "HP"
586 extern char etext;
587# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
588# define STACKBOTTOM ((ptr_t) 0xffeffffc)
589 /* empirically determined. seems to work. */
590# include <unistd.h>
591# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
592# endif
593# ifdef SYSV
594# define OS_TYPE "SYSV"
595 extern etext;
596# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
597 & ~0x3fffff) \
598 +((word)&etext & 0x1fff))
599 /* This only works for shared-text binaries with magic number 0413.
600 The other sorts of SysV binaries put the data at the end of the text,
601 in which case the default of &etext would work. Unfortunately,
602 handling both would require having the magic-number available.
603 -- Parag
604 */
605# define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
606 /* The stack starts at the top of memory, but */
607 /* 0x0 cannot be used as setjump_test complains */
608 /* that the stack direction is incorrect. Two */
609 /* bytes down from 0x0 should be safe enough. */
610 /* --Parag */
611# include <sys/mmu.h>
612# define GETPAGESIZE() PAGESIZE /* Is this still right? */
613# endif
614# ifdef AMIGA
615# define OS_TYPE "AMIGA"
616 /* STACKBOTTOM and DATASTART handled specially */
617 /* in os_dep.c */
618# define DATAEND /* not needed */
619# define GETPAGESIZE() 4096
620# endif
621# ifdef MACOS
622# ifndef __LOWMEM__
623# include <LowMem.h>
624# endif
625# define OS_TYPE "MACOS"
626 /* see os_dep.c for details of global data segments. */
627# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
628# define DATAEND /* not needed */
629# define GETPAGESIZE() 4096
630# endif
631# ifdef NEXT
632# define OS_TYPE "NEXT"
633# define DATASTART ((ptr_t) get_etext())
634# define STACKBOTTOM ((ptr_t) 0x4000000)
635# define DATAEND /* not needed */
636# endif
637# endif
638
639# ifdef POWERPC
640# define MACH_TYPE "POWERPC"
641# ifdef MACOS
642# define ALIGNMENT 2 /* Still necessary? Could it be 4? */
643# ifndef __LOWMEM__
644# include <LowMem.h>
645# endif
646# define OS_TYPE "MACOS"
647 /* see os_dep.c for details of global data segments. */
648# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
649# define DATAEND /* not needed */
650# endif
651# ifdef LINUX
652# define ALIGNMENT 4 /* Guess. Can someone verify? */
653 /* This was 2, but that didn't sound right. */
654# define OS_TYPE "LINUX"
655# define HEURISTIC1
656# define DYNAMIC_LOADING
657# undef STACK_GRAN
658# define STACK_GRAN 0x10000000
659 /* Stack usually starts at 0x80000000 */
660# define LINUX_DATA_START
661 extern int _end;
662# define DATAEND (&_end)
663# endif
664# ifdef MACOSX
665# define ALIGNMENT 4
666# define OS_TYPE "MACOSX"
667# define DATASTART ((ptr_t) get_etext())
668# define STACKBOTTOM ((ptr_t) 0xc0000000)
669# define DATAEND /* not needed */
670# endif
671# endif
672
673# ifdef VAX
674# define MACH_TYPE "VAX"
675# define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
676 extern char etext;
677# define DATASTART ((ptr_t)(&etext))
678# ifdef BSD
679# define OS_TYPE "BSD"
680# define HEURISTIC1
681 /* HEURISTIC2 may be OK, but it's hard to test. */
682# endif
683# ifdef ULTRIX
684# define OS_TYPE "ULTRIX"
685# define STACKBOTTOM ((ptr_t) 0x7fffc800)
686# endif
687# endif
688
689# ifdef RT
690# define MACH_TYPE "RT"
691# define ALIGNMENT 4
692# define DATASTART ((ptr_t) 0x10000000)
693# define STACKBOTTOM ((ptr_t) 0x1fffd800)
694# endif
695
696# ifdef SPARC
697# define MACH_TYPE "SPARC"
698# define ALIGNMENT 4 /* Required by hardware */
699# define ALIGN_DOUBLE
700 extern int etext;
701# ifdef SUNOS5
702# define OS_TYPE "SUNOS5"
703 extern int _etext;
704 extern int _end;
705 extern char * GC_SysVGetDataStart();
706# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
707# define DATAEND (&_end)
708# ifndef USE_MMAP
709# define USE_MMAP
710# endif
711# ifdef USE_MMAP
712# define HEAP_START (ptr_t)0x40000000
713# else
714# define HEAP_START DATAEND
715# endif
716# define PROC_VDB
717/* HEURISTIC1 reportedly no longer works under 2.7. Thus we */
718/* switched to HEURISTIC2, eventhough it creates some debugging */
719/* issues. */
720# define HEURISTIC2
721# include <unistd.h>
722# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
723 /* getpagesize() appeared to be missing from at least one */
724 /* Solaris 5.4 installation. Weird. */
725# define DYNAMIC_LOADING
726# endif
727# ifdef SUNOS4
728# define OS_TYPE "SUNOS4"
729 /* [If you have a weak stomach, don't read this.] */
730 /* We would like to use: */
731/* # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
732 /* This fails occasionally, due to an ancient, but very */
733 /* persistent ld bug. &etext is set 32 bytes too high. */
734 /* We instead read the text segment size from the a.out */
735 /* header, which happens to be mapped into our address space */
736 /* at the start of the text segment. The detective work here */
737 /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
738 /* Serpette of INRIA. */
739 /* This assumes ZMAGIC, i.e. demand-loadable executables. */
740# define TEXTSTART 0x2000
741# define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
742# define MPROTECT_VDB
743# define HEURISTIC1
744# define DYNAMIC_LOADING
745# endif
746# ifdef DRSNX
747# define CPP_WORDSZ 32
748# define OS_TYPE "DRSNX"
749 extern char * GC_SysVGetDataStart();
750 extern int etext;
751# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
752# define MPROTECT_VDB
753# define STACKBOTTOM ((ptr_t) 0xdfff0000)
754# define DYNAMIC_LOADING
755# endif
756# ifdef LINUX
757# define OS_TYPE "LINUX"
758# ifdef __ELF__
759# define LINUX_DATA_START
760# define DYNAMIC_LOADING
761# else
762 Linux Sparc non elf ?
763# endif
764 extern int _end;
765# define DATAEND (&_end)
766# define SVR4
767# define STACKBOTTOM ((ptr_t) 0xf0000000)
768# endif
769# ifdef OPENBSD
770# define OS_TYPE "OPENBSD"
771# define STACKBOTTOM ((ptr_t) 0xf8000000)
772# define DATASTART ((ptr_t)(&etext))
773# endif
774# endif
775
776# ifdef I386
777# define MACH_TYPE "I386"
778# define ALIGNMENT 4 /* Appears to hold for all "32 bit" compilers */
779 /* except Borland. The -a4 option fixes */
780 /* Borland. */
781 /* Ivan Demakov: For Watcom the option is -zp4. */
782# ifndef SMALL_CONFIG
783# define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
784 /* improvement on Pentiums. */
785# endif
786# ifdef SEQUENT
787# define OS_TYPE "SEQUENT"
788 extern int etext;
789# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
9ec1e770 790# define STACKBOTTOM ((ptr_t) 0x3ffff000)
155415a5
MV		 791# endif
792# ifdef SUNOS5
793# define OS_TYPE "SUNOS5"
794 extern int etext, _start;
795 extern char * GC_SysVGetDataStart();
796# define DATASTART GC_SysVGetDataStart(0x1000, &etext)
797# define STACKBOTTOM ((ptr_t)(&_start))
798/** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
799/*# define PROC_VDB*/
800# define DYNAMIC_LOADING
801# ifndef USE_MMAP
802# define USE_MMAP
803# endif
804# ifdef USE_MMAP
805# define HEAP_START (ptr_t)0x40000000
806# else
807# define HEAP_START DATAEND
808# endif
809# endif
810# ifdef SCO
811# define OS_TYPE "SCO"
812 extern int etext;
813# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
814 & ~0x3fffff) \
815 +((word)&etext & 0xfff))
816# define STACKBOTTOM ((ptr_t) 0x7ffffffc)
817# endif
818# ifdef SCO_ELF
819# define OS_TYPE "SCO_ELF"
820 extern int etext;
821# define DATASTART ((ptr_t)(&etext))
822# define STACKBOTTOM ((ptr_t) 0x08048000)
823# define DYNAMIC_LOADING
824# define ELF_CLASS ELFCLASS32
825# endif
826# ifdef LINUX
827# define OS_TYPE "LINUX"
828# define LINUX_STACKBOTTOM
829# if 0
830# define HEURISTIC1
831# undef STACK_GRAN
832# define STACK_GRAN 0x10000000
833 /* STACKBOTTOM is usually 0xc0000000, but this changes with */
834 /* different kernel configurations. In particular, systems */
835 /* with 2GB physical memory will usually move the user */
836 /* address space limit, and hence initial SP to 0x80000000. */
837# endif
838# if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
839# define MPROTECT_VDB
840# else
841 /* We seem to get random errors in incremental mode, */
842 /* possibly because Linux threads is itself a malloc client */
843 /* and can't deal with the signals. */
844# endif
845# ifdef __ELF__
846# define DYNAMIC_LOADING
847# ifdef UNDEFINED /* includes ro data */
848 extern int _etext;
849# define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
850# endif
851# include <features.h>
852# if defined(__GLIBC__) && __GLIBC__ >= 2
853# define LINUX_DATA_START
854# else
855 extern char **__environ;
856# define DATASTART ((ptr_t)(&__environ))
857 /* hideous kludge: __environ is the first */
858 /* word in crt0.o, and delimits the start */
859 /* of the data segment, no matter which */
860 /* ld options were passed through. */
861 /* We could use _etext instead, but that */
862 /* would include .rodata, which may */
863 /* contain large read-only data tables */
864 /* that we'd rather not scan. */
865# endif
866 extern int _end;
867# define DATAEND (&_end)
868# else
869 extern int etext;
870# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
871# endif
872# ifdef USE_I686_PREFETCH
873# define PREFETCH(x) \
874 __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))
875 /* Empirically prefetcht0 is much more effective at reducing */
876 /* cache miss stalls for the targetted load instructions. But it */
877 /* seems to interfere enough with other cache traffic that the net */
878 /* result is worse than prefetchnta. */
9ec1e770 879# if 0
155415a5
MV		 880 /* Using prefetches for write seems to have a slight negative */
881 /* impact on performance, at least for a PIII/500. */
882# define PREFETCH_FOR_WRITE(x) \
883 __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))
884# endif
885# endif
886# ifdef USE_3DNOW_PREFETCH
887# define PREFETCH(x) \
888 __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))
9ec1e770 889# define PREFETCH_FOR_WRITE(x)
155415a5
MV		 890 __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))
891# endif
892# endif
893# ifdef CYGWIN32
894# define OS_TYPE "CYGWIN32"
895 extern int _data_start__;
896 extern int _data_end__;
897 extern int _bss_start__;
898 extern int _bss_end__;
899 /* For binutils 2.9.1, we have */
900 /* DATASTART = _data_start__ */
901 /* DATAEND = _bss_end__ */
902 /* whereas for some earlier versions it was */
903 /* DATASTART = _bss_start__ */
904 /* DATAEND = _data_end__ */
905 /* To get it right for both, we take the */
906 /* minumum/maximum of the two. */
907# define MAX(x,y) ((x) > (y) ? (x) : (y))
908# define MIN(x,y) ((x) < (y) ? (x) : (y))
909# define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
910# define DATAEND ((ptr_t) MAX(&_data_end__, &_bss_end__))
911# undef STACK_GRAN
912# define STACK_GRAN 0x10000
913# define HEURISTIC1
914# endif
915# ifdef OS2
916# define OS_TYPE "OS2"
917 /* STACKBOTTOM and DATASTART are handled specially in */
918 /* os_dep.c. OS2 actually has the right */
919 /* system call! */
920# define DATAEND /* not needed */
921# endif
922# ifdef MSWIN32
923# define OS_TYPE "MSWIN32"
924 /* STACKBOTTOM and DATASTART are handled specially in */
925 /* os_dep.c. */
926# ifndef __WATCOMC__
927# define MPROTECT_VDB
928# endif
929# define DATAEND /* not needed */
930# endif
931# ifdef DJGPP
932# define OS_TYPE "DJGPP"
933# include "stubinfo.h"
934 extern int etext;
935 extern int _stklen;
936 extern int __djgpp_stack_limit;
937# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
938/* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
939 + _stklen)) */
940# define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
941 /* This may not be right. */
942# endif
943# ifdef OPENBSD
944# define OS_TYPE "OPENBSD"
945# endif
946# ifdef FREEBSD
947# define OS_TYPE "FREEBSD"
948# define MPROTECT_VDB
949# endif
950# ifdef NETBSD
951# define OS_TYPE "NETBSD"
952# endif
953# ifdef THREE86BSD
954# define OS_TYPE "THREE86BSD"
955# endif
956# ifdef BSDI
957# define OS_TYPE "BSDI"
958# endif
959# if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
960 || defined(THREE86BSD) || defined(BSDI)
961# define HEURISTIC2
962 extern char etext;
963# define DATASTART ((ptr_t)(&etext))
964# endif
965# ifdef NEXT
966# define OS_TYPE "NEXT"
967# define DATASTART ((ptr_t) get_etext())
968# define STACKBOTTOM ((ptr_t)0xc0000000)
969# define DATAEND /* not needed */
970# endif
971# ifdef DOS4GW
972# define OS_TYPE "DOS4GW"
973 extern long __nullarea;
974 extern char _end;
975 extern char *_STACKTOP;
976 /* Depending on calling conventions Watcom C either precedes
977 or does not precedes with undescore names of C-variables.
978 Make sure startup code variables always have the same names. */
979 #pragma aux __nullarea "*";
980 #pragma aux _end "*";
981# define STACKBOTTOM ((ptr_t) _STACKTOP)
982 /* confused? me too. */
983# define DATASTART ((ptr_t) &__nullarea)
984# define DATAEND ((ptr_t) &_end)
985# endif
9c52b218
RB		 986# ifdef GNU
987# define OS_TYPE "GNU"
988# endif
155415a5
MV		 989# endif
990
991# ifdef NS32K
992# define MACH_TYPE "NS32K"
993# define ALIGNMENT 4
994 extern char **environ;
995# define DATASTART ((ptr_t)(&environ))
996 /* hideous kludge: environ is the first */
997 /* word in crt0.o, and delimits the start */
998 /* of the data segment, no matter which */
999 /* ld options were passed through. */
1000# define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
1001# endif
1002
1003# ifdef MIPS
1004# define MACH_TYPE "MIPS"
1005/* # define STACKBOTTOM ((ptr_t)0x7fff8000) sometimes also works. */
1006# ifdef LINUX
1007 /* This was developed for a linuxce style platform. Probably */
1008 /* needs to be tweaked for workstation class machines. */
1009# define OS_TYPE "LINUX"
1010 extern int __data_start;
1011# define DATASTART ((ptr_t)(&__data_start))
1012# define ALIGNMENT 4
1013# define USE_GENERIC_PUSH_REGS 1
1014# define STACKBOTTOM 0x80000000
1015 /* In many cases, this should probably use LINUX_STACKBOTTOM */
1016 /* instead. But some kernel versions seem to give the wrong */
1017 /* value from /proc. */
1018# endif /* Linux */
1019# ifdef ULTRIX
1020# define HEURISTIC2
1021# define DATASTART (ptr_t)0x10000000
1022 /* Could probably be slightly higher since */
1023 /* startup code allocates lots of stuff. */
1024# define OS_TYPE "ULTRIX"
1025# define ALIGNMENT 4
1026# endif
1027# ifdef RISCOS
1028# define HEURISTIC2
1029# define DATASTART (ptr_t)0x10000000
1030# define OS_TYPE "RISCOS"
1031# define ALIGNMENT 4 /* Required by hardware */
1032# endif
1033# ifdef IRIX5
1034# define HEURISTIC2
1035 extern int _fdata;
1036# define DATASTART ((ptr_t)(&_fdata))
1037# ifdef USE_MMAP
1038# define HEAP_START (ptr_t)0x30000000
1039# else
1040# define HEAP_START DATASTART
1041# endif
1042 /* Lowest plausible heap address. */
1043 /* In the MMAP case, we map there. */
1044 /* In either case it is used to identify */
1045 /* heap sections so they're not */
1046 /* considered as roots. */
1047# define OS_TYPE "IRIX5"
1048# define MPROTECT_VDB
1049# ifdef _MIPS_SZPTR
1050# define CPP_WORDSZ _MIPS_SZPTR
1051# define ALIGNMENT (_MIPS_SZPTR/8)
1052# if CPP_WORDSZ != 64
1053# define ALIGN_DOUBLE
1054# endif
1055# else
1056# define ALIGNMENT 4
1057# define ALIGN_DOUBLE
1058# endif
1059# define DYNAMIC_LOADING
1060# endif
1061# endif
1062
1063# ifdef RS6000
1064# define MACH_TYPE "RS6000"
1065# define ALIGNMENT 4
1066# define DATASTART ((ptr_t)0x20000000)
1067 extern int errno;
1068# define STACKBOTTOM ((ptr_t)((ulong)&errno))
1069# define DYNAMIC_LOADING
1070 /* For really old versions of AIX, this may have to be removed. */
1071# endif
1072
1073# ifdef HP_PA
1074 /* OS is assumed to be HP/UX */
1075# define MACH_TYPE "HP_PA"
1076# define OS_TYPE "HPUX"
1077# ifdef __LP64__
1078# define CPP_WORDSZ 64
1079# define ALIGNMENT 8
1080# else
1081# define CPP_WORDSZ 32
1082# define ALIGNMENT 4
1083# define ALIGN_DOUBLE
1084# endif
1085 extern int __data_start;
1086# define DATASTART ((ptr_t)(&__data_start))
1087# if 0
1088 /* The following appears to work for 7xx systems running HP/UX */
1089 /* 9.xx Furthermore, it might result in much faster */
1090 /* collections than HEURISTIC2, which may involve scanning */
1091 /* segments that directly precede the stack. It is not the */
1092 /* default, since it may not work on older machine/OS */
1093 /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1094 /* this.) */
1095# define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1096# else
1097 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1098 /* to this. We'll probably do this on other platforms, too. */
1099 /* For now I'll use it where I can test it. */
1100 extern char ** environ;
1101# define STACKBOTTOM ((ptr_t)environ)
1102# endif
2485c279 1103# ifndef SCM_STACK_GROWS_UP /* don't fight with scmconfig.h */
91b17416 1104# define SCM_STACK_GROWS_UP 1
2485c279 1105# endif
155415a5
MV		 1106# define DYNAMIC_LOADING
1107# ifndef HPUX_THREADS
1108# define MPROTECT_VDB
1109# endif
1110# include <unistd.h>
1111# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1112# endif
1113
1114# ifdef ALPHA
1115# define MACH_TYPE "ALPHA"
1116# define ALIGNMENT 8
1117# define USE_GENERIC_PUSH_REGS
1118 /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1119 /* fp registers in some cases when the target is a 21264. The assembly */
1120 /* code doesn't handle that yet, and version dependencies make that a */
1121 /* bit tricky. Do the easy thing for now. */
1122# ifdef OSF1
1123# define OS_TYPE "OSF1"
1124# define DATASTART ((ptr_t) 0x140000000)
1125 extern _end;
1126# define DATAEND ((ptr_t) &_end)
1127# define HEURISTIC2
1128 /* Normally HEURISTIC2 is too conervative, since */
1129 /* the text segment immediately follows the stack. */
1130 /* Hence we give an upper pound. */
1131 extern int __start;
1132# define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
1133# define CPP_WORDSZ 64
1134# define MPROTECT_VDB
1135# define DYNAMIC_LOADING
1136# endif
1137# ifdef LINUX
1138# define OS_TYPE "LINUX"
1139# define CPP_WORDSZ 64
1140# define STACKBOTTOM ((ptr_t) 0x120000000)
1141# ifdef __ELF__
1142# define LINUX_DATA_START
1143# define DYNAMIC_LOADING
1144 /* This doesn't work if the collector is in a dynamic library. */
1145# else
1146# define DATASTART ((ptr_t) 0x140000000)
1147# endif
1148 extern int _end;
1149# define DATAEND (&_end)
1150# define MPROTECT_VDB
1151 /* Has only been superficially tested. May not */
1152 /* work on all versions. */
1153# endif
1154# endif
1155
1156# ifdef IA64
1157# define MACH_TYPE "IA64"
1158# define ALIGN_DOUBLE
1159 /* Requires 16 byte alignment for malloc */
1160# define ALIGNMENT 8
1161# define USE_GENERIC_PUSH_REGS
1162 /* We need to get preserved registers in addition to register windows. */
1163 /* That's easiest to do with setjmp. */
1164# ifdef HPUX
1165 --> needs work
1166# endif
1167# ifdef LINUX
1168# define OS_TYPE "LINUX"
1169# define CPP_WORDSZ 64
1170 /* This should really be done through /proc, but that */
1171 /* requires we run on an IA64 kernel. */
1172# define STACKBOTTOM ((ptr_t) 0xa000000000000000l)
1173 /* We also need the base address of the register stack */
1174 /* backing store. There is probably a better way to */
1175 /* get that, too ... */
1176# define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l)
1177# if 1
1178# define SEARCH_FOR_DATA_START
1179# define DATASTART GC_data_start
1180# else
1181 extern int data_start;
1182# define DATASTART ((ptr_t)(&data_start))
1183# endif
1184# define DYNAMIC_LOADING
1185# define MPROTECT_VDB
1186 /* Requires Linux 2.3.47 or later. */
1187 extern int _end;
1188# define DATAEND (&_end)
1189# define PREFETCH(x) \
1190 __asm__ (" lfetch [%0]": : "r"((void *)(x)))
1191# define PREFETCH_FOR_WRITE(x) \
1192 __asm__ (" lfetch.excl [%0]": : "r"((void *)(x)))
1193# define CLEAR_DOUBLE(x) \
1194 __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1195# endif
1196# endif
1197
1198# ifdef M88K
1199# define MACH_TYPE "M88K"
1200# define ALIGNMENT 4
1201# define ALIGN_DOUBLE
1202 extern int etext;
1203# ifdef CX_UX
1204# define OS_TYPE "CX_UX"
1205# define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1206# endif
1207# ifdef DGUX
1208# define OS_TYPE "DGUX"
1209 extern char * GC_SysVGetDataStart();
1210# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
1211# endif
1212# define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1213# endif
1214
1215# ifdef S370
1216# define MACH_TYPE "S370"
1217# define OS_TYPE "UTS4"
1218# define ALIGNMENT 4 /* Required by hardware */
1219 extern int etext;
1220 extern int _etext;
1221 extern int _end;
1222 extern char * GC_SysVGetDataStart();
1223# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
1224# define DATAEND (&_end)
1225# define HEURISTIC2
1226# endif
1227
1228# if defined(PJ)
1229# define ALIGNMENT 4
1230 extern int _etext;
1231# define DATASTART ((ptr_t)(&_etext))
1232# define HEURISTIC1
1233# endif
1234
1235# ifdef ARM32
1236# define CPP_WORDSZ 32
1237# define MACH_TYPE "ARM32"
1238# define ALIGNMENT 4
1239# ifdef NETBSD
1240# define OS_TYPE "NETBSD"
1241# define HEURISTIC2
1242 extern char etext;
1243# define DATASTART ((ptr_t)(&etext))
1244# define USE_GENERIC_PUSH_REGS
1245# endif
1246# ifdef LINUX
1247# define OS_TYPE "LINUX"
1248# define HEURISTIC1
1249# undef STACK_GRAN
1250# define STACK_GRAN 0x10000000
1251# define USE_GENERIC_PUSH_REGS
1252# ifdef __ELF__
1253# define DYNAMIC_LOADING
1254# include <features.h>
1255# if defined(__GLIBC__) && __GLIBC__ >= 2
1256# define LINUX_DATA_START
1257# else
1258 extern char **__environ;
1259# define DATASTART ((ptr_t)(&__environ))
1260 /* hideous kludge: __environ is the first */
1261 /* word in crt0.o, and delimits the start */
1262 /* of the data segment, no matter which */
1263 /* ld options were passed through. */
1264 /* We could use _etext instead, but that */
1265 /* would include .rodata, which may */
1266 /* contain large read-only data tables */
1267 /* that we'd rather not scan. */
1268# endif
1269 extern int _end;
1270# define DATAEND (&_end)
1271# else
1272 extern int etext;
1273# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
1274# endif
1275# endif
1276#endif
1277
1278#ifdef LINUX_DATA_START
1279 /* Some Linux distributions arrange to define __data_start. Some */
1280 /* define data_start as a weak symbol. The latter is technically */
1281 /* broken, since the user program may define data_start, in which */
1282 /* case we lose. Nonetheless, we try both, prefering __data_start. */
1283 /* We assume gcc. */
1284# pragma weak __data_start
1285 extern int __data_start;
1286# pragma weak data_start
1287 extern int data_start;
1288# define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
1289#endif
1290
91b17416
RB		 1291# if SCM_STACK_GROWS_UP
1292# define STACK_GROWS_DOWN 0
1293# else
1294# define STACK_GROWS_DOWN 1
1295#endif
155415a5
MV		 1296
1297# ifndef CPP_WORDSZ
1298# define CPP_WORDSZ 32
1299# endif
1300
1301# ifndef OS_TYPE
1302# define OS_TYPE ""
1303# endif
1304
1305# ifndef DATAEND
1306 extern int end;
1307# define DATAEND (&end)
1308# endif
1309
1310# if defined(SVR4) && !defined(GETPAGESIZE)
1311# include <unistd.h>
1312# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1313# endif
1314
1315# ifndef GETPAGESIZE
1316# if defined(SUNOS5) || defined(IRIX5)
1317# include <unistd.h>
1318# endif
1319# define GETPAGESIZE() getpagesize()
1320# endif
1321
1322# if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
1323 /* OS has SVR4 generic features. Probably others also qualify. */
1324# define SVR4
1325# endif
1326
1327# if defined(SUNOS5) || defined(DRSNX)
1328 /* OS has SUNOS5 style semi-undocumented interface to dynamic */
1329 /* loader. */
1330# define SUNOS5DL
1331 /* OS has SUNOS5 style signal handlers. */
1332# define SUNOS5SIGS
1333# endif
1334
1335# if defined(HPUX)
1336# define SUNOS5SIGS
1337# endif
1338
1339# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
1340 -> bad word size
1341# endif
1342
1343# ifdef PCR
1344# undef DYNAMIC_LOADING
1345# undef STACKBOTTOM
1346# undef HEURISTIC1
1347# undef HEURISTIC2
1348# undef PROC_VDB
1349# undef MPROTECT_VDB
1350# define PCR_VDB
1351# endif
1352
1353# ifdef SRC_M3
1354/* Postponed for now. */
1355# undef PROC_VDB
1356# undef MPROTECT_VDB
1357# endif
1358
1359# ifdef SMALL_CONFIG
1360/* Presumably not worth the space it takes. */
1361# undef PROC_VDB
1362# undef MPROTECT_VDB
1363# endif
1364
1365# ifdef USE_MUNMAP
1366# undef MPROTECT_VDB /* Can't deal with address space holes. */
1367# endif
1368
1369# if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
1370# define DEFAULT_VDB
1371# endif
1372
1373# ifndef PREFETCH
1374# define PREFETCH(x)
1375# define NO_PREFETCH
1376# endif
1377
1378# ifndef PREFETCH_FOR_WRITE
1379# define PREFETCH_FOR_WRITE(x)
1380# define NO_PREFETCH_FOR_WRITE
1381# endif
1382
1383# ifndef CACHE_LINE_SIZE
1384# define CACHE_LINE_SIZE 32 /* Wild guess */
1385# endif
1386
1387# ifndef CLEAR_DOUBLE
1388# define CLEAR_DOUBLE(x) \
1389 ((word*)x)[0] = 0; \
1390 ((word*)x)[1] = 0;
1391# endif /* CLEAR_DOUBLE */
1392
1393# if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
1394# define SOLARIS_THREADS
1395# endif
1396# if defined(IRIX_THREADS) && !defined(IRIX5)
1397--> inconsistent configuration
1398# endif
1399# if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
1400--> inconsistent configuration
1401# endif
1402# if defined(LINUX_THREADS) && !defined(LINUX)
1403--> inconsistent configuration
1404# endif
1405# if defined(SOLARIS_THREADS) && !defined(SUNOS5)
1406--> inconsistent configuration
1407# endif
1408# if defined(HPUX_THREADS) && !defined(HPUX)
1409--> inconsistent configuration
1410# endif
1411# if defined(PCR) || defined(SRC_M3) || \
1412 defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
1413 defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
1414 defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
1415# define THREADS
1416# endif
1417
1418# if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
1419 || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
1420 /* Use setjmp based hack to mark from callee-save registers. */
1421# define USE_GENERIC_PUSH_REGS
1422# endif
1423# if defined(SPARC) && !defined(LINUX)
1424# define SAVE_CALL_CHAIN
1425# define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
1426 /* include assembly code to do it well. */
1427# endif
1428
1429# if defined(LINUX) && !defined(POWERPC)
bc286d9f 1430
9ec1e770 1431# if 0
155415a5
MV		 1432# include <linux/version.h>
1433# if (LINUX_VERSION_CODE <= 0x10400)
bc286d9f 1434 /* Ugly hack to get struct sigcontext_struct definition. Required */
155415a5
MV		 1435 /* for some early 1.3.X releases. Will hopefully go away soon. */
1436 /* in some later Linux releases, asm/sigcontext.h may have to */
1437 /* be included instead. */
1438# define __KERNEL__
1439# include <asm/signal.h>
1440# undef __KERNEL__
5159b336
MV		 1441# endif
1442
1443# else
bc286d9f 1444
155415a5
MV		 1445 /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
1446 /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
1447 /* prototypes, so we have to include the top-level sigcontext.h to */
1448 /* make sure the former gets defined to be the latter if appropriate. */
1449# include <features.h>
1450# if 2 <= __GLIBC__
1451# if 2 == __GLIBC__ && 0 == __GLIBC_MINOR__
1452 /* glibc 2.1 no longer has sigcontext.h. But signal.h */
1453 /* has the right declaration for glibc 2.1. */
1454# include <sigcontext.h>
1455# endif /* 0 == __GLIBC_MINOR__ */
1456# else /* not 2 <= __GLIBC__ */
1457 /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
1458 /* one. Check LINUX_VERSION_CODE to see which we should reference. */
1459# include <asm/sigcontext.h>
1460# endif /* 2 <= __GLIBC__ */
1461# endif
1462# endif
1463# if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
1464# include <sys/types.h>
1465# if !defined(MSWIN32) && !defined(SUNOS4)
1466# include <unistd.h>
1467# endif
1468# endif
1469
155415a5
MV		 1470# include <signal.h>
1471
1472/* Blatantly OS dependent routines, except for those that are related */
1473/* to dynamic loading. */
1474
1475# if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
1476# define NEED_FIND_LIMIT
1477# endif
1478
1479# if defined(IRIX_THREADS) || defined(HPUX_THREADS)
1480# define NEED_FIND_LIMIT
1481# endif
1482
1483# if (defined(SUNOS4) && defined(DYNAMIC_LOADING)) && !defined(PCR)
1484# define NEED_FIND_LIMIT
1485# endif
1486
1487# if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
1488# define NEED_FIND_LIMIT
1489# endif
1490
1491# if defined(LINUX) && \
1492 (defined(POWERPC) || defined(SPARC) || defined(ALPHA) || defined(IA64) \
1493 || defined(MIPS))
1494# define NEED_FIND_LIMIT
1495# endif
1496
1497#ifdef NEED_FIND_LIMIT
1498# include <setjmp.h>
1499#endif
1500
1501#ifdef FREEBSD
1502# include <machine/trap.h>
1503#endif
1504
1505#ifdef AMIGA
1506# include <proto/exec.h>
1507# include <proto/dos.h>
1508# include <dos/dosextens.h>
1509# include <workbench/startup.h>
1510#endif
1511
1512#ifdef MSWIN32
1513# define WIN32_LEAN_AND_MEAN
1514# define NOSERVICE
1515# include <windows.h>
1516#endif
1517
1518#ifdef MACOS
1519# include <Processes.h>
1520#endif
1521
1522#ifdef IRIX5
1523# include <sys/uio.h>
1524# include <malloc.h> /* for locking */
1525#endif
1526#ifdef USE_MMAP
1527# include <sys/types.h>
1528# include <sys/mman.h>
1529# include <sys/stat.h>
1530# include <fcntl.h>
1531#endif
1532
1533#ifdef SUNOS5SIGS
1534# include <sys/siginfo.h>
1535# undef setjmp
1536# undef longjmp
1537# define setjmp(env) sigsetjmp(env, 1)
1538# define longjmp(env, val) siglongjmp(env, val)
1539# define jmp_buf sigjmp_buf
1540#endif
1541
1542#ifdef DJGPP
1543 /* Apparently necessary for djgpp 2.01. May casuse problems with */
1544 /* other versions. */
1545 typedef long unsigned int caddr_t;
1546#endif
1547
1548#ifdef PCR
1549# include "il/PCR_IL.h"
1550# include "th/PCR_ThCtl.h"
1551# include "mm/PCR_MM.h"
1552#endif
1553
1554#if !defined(NO_EXECUTE_PERMISSION)
1555# define OPT_PROT_EXEC PROT_EXEC
1556#else
1557# define OPT_PROT_EXEC 0
1558#endif
1559
1560# ifdef OS2
1561
1562# include <stddef.h>
1563
1564# if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
1565
1566# else /* IBM's compiler */
1567
1568/* A kludge to get around what appears to be a header file bug */
1569# ifndef WORD
1570# define WORD unsigned short
1571# endif
1572# ifndef DWORD
1573# define DWORD unsigned long
1574# endif
1575
1576# define EXE386 1
1577# include <newexe.h>
1578# include <exe386.h>
1579
1580# endif /* __IBMC__ */
1581
1582# define INCL_DOSEXCEPTIONS
1583# define INCL_DOSPROCESS
1584# define INCL_DOSERRORS
1585# define INCL_DOSMODULEMGR
1586# define INCL_DOSMEMMGR
1587# include <os2.h>
1588
1589# endif /*!OS/2 */
1590
9ec1e770
TTN		 1591/*
1592 * Find the base of the stack.
155415a5
MV		 1593 * Used only in single-threaded environment.
1594 * With threads, GC_mark_roots needs to know how to do this.
1595 * Called with allocator lock held.
1596 */
9ec1e770 1597# ifdef MSWIN32
155415a5
MV		 1598# define is_writable(prot) ((prot) == PAGE_READWRITE \
1599 || (prot) == PAGE_WRITECOPY \
1600 || (prot) == PAGE_EXECUTE_READWRITE \
1601 || (prot) == PAGE_EXECUTE_WRITECOPY)
1602/* Return the number of bytes that are writable starting at p. */
1603/* The pointer p is assumed to be page aligned. */
1604/* If base is not 0, *base becomes the beginning of the */
1605/* allocation region containing p. */
1606static word GC_get_writable_length(ptr_t p, ptr_t *base)
1607{
1608 MEMORY_BASIC_INFORMATION buf;
1609 word result;
1610 word protect;
9ec1e770 1611
155415a5
MV		 1612 result = VirtualQuery(p, &buf, sizeof(buf));
1613 if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
1614 if (base != 0) *base = (ptr_t)(buf.AllocationBase);
1615 protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
1616 if (!is_writable(protect)) {
1617 return(0);
1618 }
1619 if (buf.State != MEM_COMMIT) return(0);
1620 return(buf.RegionSize);
1621}
1622
1623void *scm_get_stack_base()
1624{
1625 int dummy;
1626 ptr_t sp = (ptr_t)(&dummy);
70f95333
MV		 1627 ptr_t trunc_sp;
1628 word size;
1629 static word GC_page_size = 0;
1630 if (!GC_page_size) {
1631 SYSTEM_INFO sysinfo;
1632 GetSystemInfo(&sysinfo);
1633 GC_page_size = sysinfo.dwPageSize;
1634 }
1635 trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
1636 size = GC_get_writable_length(trunc_sp, 0);
155415a5
MV		 1637 return(trunc_sp + size);
1638}
1639
1640
1641# else
1642
1643# ifdef OS2
1644
1645void *scm_get_stack_base()
1646{
1647 PTIB ptib;
1648 PPIB ppib;
9ec1e770 1649
155415a5
MV		 1650 if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
1651 GC_err_printf0("DosGetInfoBlocks failed\n");
1652 ABORT("DosGetInfoBlocks failed\n");
1653 }
1654 return((ptr_t)(ptib -> tib_pstacklimit));
1655}
1656
1657# else
1658
1659# ifdef AMIGA
1660
1661void *scm_get_stack_base()
1662{
1663 struct Process *proc = (struct Process*)SysBase->ThisTask;
9ec1e770 1664
155415a5
MV		 1665 /* Reference: Amiga Guru Book Pages: 42,567,574 */
1666 if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS
1667 && proc->pr_CLI != NULL) {
1668 /* first ULONG is StackSize */
1669 /*longPtr = proc->pr_ReturnAddr;
1670 size = longPtr[0];*/
1671
1672 return (char *)proc->pr_ReturnAddr + sizeof(ULONG);
1673 } else {
1674 return (char *)proc->pr_Task.tc_SPUpper;
1675 }
1676}
1677
1678#if 0 /* old version */
1679void *scm_get_stack_base()
1680{
1681 extern struct WBStartup *_WBenchMsg;
1682 extern long __base;
1683 extern long __stack;
1684 struct Task *task;
1685 struct Process *proc;
1686 struct CommandLineInterface *cli;
1687 long size;
1688
1689 if ((task = FindTask(0)) == 0) {
1690 GC_err_puts("Cannot find own task structure\n");
1691 ABORT("task missing");
1692 }
1693 proc = (struct Process *)task;
1694 cli = BADDR(proc->pr_CLI);
1695
1696 if (_WBenchMsg != 0 || cli == 0) {
1697 size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
1698 } else {
1699 size = cli->cli_DefaultStack * 4;
1700 }
1701 return (ptr_t)(__base + GC_max(size, __stack));
1702}
1703#endif /* 0 */
1704
1705# else /* !AMIGA, !OS2, ... */
1706
1707# ifdef NEED_FIND_LIMIT
1708 /* Some tools to implement HEURISTIC2 */
1709# define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
1710 /* static */ jmp_buf GC_jmp_buf;
9ec1e770 1711
155415a5
MV		 1712 /*ARGSUSED*/
1713 static void GC_fault_handler(sig)
1714 int sig;
1715 {
1716 longjmp(GC_jmp_buf, 1);
1717 }
1718
1719# ifdef __STDC__
1720 typedef void (*handler)(int);
1721# else
1722 typedef void (*handler)();
1723# endif
1724
1725# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1726 static struct sigaction old_segv_act;
1727# if defined(_sigargs) || defined(HPUX) /* !Irix6.x */
1728 static struct sigaction old_bus_act;
1729# endif
1730# else
1731 static handler old_segv_handler, old_bus_handler;
1732# endif
9ec1e770 1733
155415a5
MV		 1734 static void GC_setup_temporary_fault_handler()
1735 {
1736# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1737 struct sigaction act;
1738
1739 act.sa_handler = GC_fault_handler;
1740 act.sa_flags = SA_RESTART | SA_NODEFER;
1741 /* The presence of SA_NODEFER represents yet another gross */
1742 /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
1743 /* interact correctly with -lthread. We hide the confusion */
1744 /* by making sure that signal handling doesn't affect the */
1745 /* signal mask. */
1746
1747 (void) sigemptyset(&act.sa_mask);
1748# ifdef IRIX_THREADS
1749 /* Older versions have a bug related to retrieving and */
1750 /* and setting a handler at the same time. */
1751 (void) sigaction(SIGSEGV, 0, &old_segv_act);
1752 (void) sigaction(SIGSEGV, &act, 0);
1753# else
1754 (void) sigaction(SIGSEGV, &act, &old_segv_act);
1755# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1756 || defined(HPUX)
1757 /* Under Irix 5.x or HP/UX, we may get SIGBUS. */
1758 /* Pthreads doesn't exist under Irix 5.x, so we */
1759 /* don't have to worry in the threads case. */
1760 (void) sigaction(SIGBUS, &act, &old_bus_act);
1761# endif
1762# endif /* IRIX_THREADS */
1763# else
1764 old_segv_handler = signal(SIGSEGV, GC_fault_handler);
1765# ifdef SIGBUS
1766 old_bus_handler = signal(SIGBUS, GC_fault_handler);
1767# endif
1768# endif
1769 }
9ec1e770 1770
155415a5
MV		 1771 static void GC_reset_fault_handler()
1772 {
1773# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1774 (void) sigaction(SIGSEGV, &old_segv_act, 0);
1775# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1776 || defined(HPUX)
1777 (void) sigaction(SIGBUS, &old_bus_act, 0);
1778# endif
1779# else
1780 (void) signal(SIGSEGV, old_segv_handler);
1781# ifdef SIGBUS
1782 (void) signal(SIGBUS, old_bus_handler);
1783# endif
1784# endif
1785 }
1786
9ec1e770
TTN		 1787 /* Single argument version, robust against whole program analysis. */
1788 static void
1789 GC_noop1(x)
1790 word x;
1791 {
1792 static VOLATILE word sink;
1793 sink = x;
1794 }
1795
155415a5
MV		 1796 /* Return the first nonaddressible location > p (up) or */
1797 /* the smallest location q s.t. [q,p] is addressible (!up). */
1798 static ptr_t GC_find_limit(p, up)
1799 ptr_t p;
1800 GC_bool up;
1801 {
1802 static VOLATILE ptr_t result;
1803 /* Needs to be static, since otherwise it may not be */
1804 /* preserved across the longjmp. Can safely be */
1805 /* static since it's only called once, with the */
1806 /* allocation lock held. */
1807
1808
1809 GC_setup_temporary_fault_handler();
1810 if (setjmp(GC_jmp_buf) == 0) {
1811 result = (ptr_t)(((word)(p))
1812 & ~(MIN_PAGE_SIZE-1));
1813 for (;;) {
1814 if (up) {
1815 result += MIN_PAGE_SIZE;
1816 } else {
1817 result -= MIN_PAGE_SIZE;
1818 }
1819 GC_noop1((word)(*result));
1820 }
1821 }
1822 GC_reset_fault_handler();
1823 if (!up) {
1824 result += MIN_PAGE_SIZE;
1825 }
1826 return(result);
1827 }
d315ea8c 1828
155415a5
MV		 1829# endif
1830
1831#ifdef LINUX_STACKBOTTOM
1832
1833#include <sys/types.h>
1834#include <sys/stat.h>
1835#include <fcntl.h>
1836
1837# define STAT_SKIP 27 /* Number of fields preceding startstack */
1838 /* field in /proc/self/stat */
1839
1840 static ptr_t GC_linux_stack_base(void)
1841 {
1842 /* We read the stack base value from /proc/self/stat. We do this */
1843 /* using direct I/O system calls in order to avoid calling malloc */
9ec1e770 1844 /* in case REDIRECT_MALLOC is defined. */
155415a5
MV		 1845# define STAT_BUF_SIZE 4096
1846# ifdef USE_LD_WRAP
1847# define STAT_READ __real_read
1848# else
1849# define STAT_READ read
9ec1e770 1850# endif
155415a5
MV		 1851 char stat_buf[STAT_BUF_SIZE];
1852 int f;
1853 char c;
1854 word result = 0;
1855 size_t i, buf_offset = 0;
1856
1857 f = open("/proc/self/stat", O_RDONLY);
1858 if (f < 0 || STAT_READ(f, stat_buf, STAT_BUF_SIZE) < 2 * STAT_SKIP) {
1859 ABORT("Couldn't read /proc/self/stat");
1860 }
1861 c = stat_buf[buf_offset++];
1862 /* Skip the required number of fields. This number is hopefully */
1863 /* constant across all Linux implementations. */
1864 for (i = 0; i < STAT_SKIP; ++i) {
1865 while (isspace(c)) c = stat_buf[buf_offset++];
1866 while (!isspace(c)) c = stat_buf[buf_offset++];
1867 }
1868 while (isspace(c)) c = stat_buf[buf_offset++];
1869 while (isdigit(c)) {
1870 result *= 10;
1871 result += c - '0';
1872 c = stat_buf[buf_offset++];
1873 }
1874 close(f);
1875 if (result < 0x10000000) ABORT("Absurd stack bottom value");
1876 return (ptr_t)result;
1877 }
1878
1879#endif /* LINUX_STACKBOTTOM */
1880
1881void *scm_get_stack_base()
9500b5b9 1882{
155415a5 1883 word dummy;
537abaae
RB		 1884 void *result;
1885
1886 result = &dummy; /* initialize to silence compiler */
155415a5
MV		 1887
1888# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
1889
1890# ifdef STACKBOTTOM
1891 return(STACKBOTTOM);
1892# else
1893# ifdef HEURISTIC1
91b17416 1894# if STACK_GROWS_DOWN
155415a5
MV		 1895 result = (ptr_t)((((word)(&dummy))
1896 + STACKBOTTOM_ALIGNMENT_M1)
1897 & ~STACKBOTTOM_ALIGNMENT_M1);
1898# else
1899 result = (ptr_t)(((word)(&dummy))
1900 & ~STACKBOTTOM_ALIGNMENT_M1);
1901# endif
1902# endif /* HEURISTIC1 */
1903# ifdef LINUX_STACKBOTTOM
1904 result = GC_linux_stack_base();
1905# endif
1906# ifdef HEURISTIC2
91b17416 1907# if STACK_GROWS_DOWN
155415a5
MV		 1908 result = GC_find_limit((ptr_t)(&dummy), TRUE);
1909# ifdef HEURISTIC2_LIMIT
1910 if (result > HEURISTIC2_LIMIT
1911 && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
1912 result = HEURISTIC2_LIMIT;
1913 }
1914# endif
1915# else
1916 result = GC_find_limit((ptr_t)(&dummy), FALSE);
1917# ifdef HEURISTIC2_LIMIT
1918 if (result < HEURISTIC2_LIMIT
1919 && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
1920 result = HEURISTIC2_LIMIT;
1921 }
1922# endif
1923# endif
1924
1925# endif /* HEURISTIC2 */
91b17416 1926# if STACK_GROWS_DOWN
155415a5
MV		 1927 if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
1928# endif
1929 return(result);
1930# endif /* STACKBOTTOM */
9500b5b9 1931}
155415a5
MV		 1932
1933# endif /* ! AMIGA */
1934# endif /* ! OS2 */
1935# endif /* ! MSWIN32 */
8cbb63c7 1936
fbff94c9 1937#endif /* mach_type_known */
8cbb63c7 1938#endif /* ! HAVE_LIBC_STACK_END */
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