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(exception:string-contains-nul): New exception pattern.
[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.
2b829bbb 6 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2006 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{
2b829bbb 404 ABORT ("Can't determine stack base");
fbff94c9
MV		 405 return NULL;
406}
407
408# else
155415a5
MV		 409 /* Mapping is: M68K ==> Motorola 680X0 */
410 /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
411 /* MACOS and AMIGA variants) */
412 /* I386 ==> Intel 386 */
413 /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
414 /* FREEBSD, THREE86BSD, MSWIN32, */
415 /* BSDI,SUNOS5, NEXT, other variants) */
416 /* NS32K ==> Encore Multimax */
417 /* MIPS ==> R2000 or R3000 */
418 /* (RISCOS, ULTRIX variants) */
419 /* VAX ==> DEC VAX */
420 /* (BSD, ULTRIX variants) */
421 /* RS6000 ==> IBM RS/6000 AIX3.X */
422 /* RT ==> IBM PC/RT */
423 /* HP_PA ==> HP9000/700 & /800 */
424 /* HP/UX */
425 /* SPARC ==> SPARC under SunOS */
426 /* (SUNOS4, SUNOS5, */
427 /* DRSNX variants) */
428 /* ALPHA ==> DEC Alpha */
429 /* (OSF1 and LINUX variants) */
430 /* M88K ==> Motorola 88XX0 */
431 /* (CX_UX and DGUX) */
432 /* S370 ==> 370-like machine */
433 /* running Amdahl UTS4 */
434 /* ARM32 ==> Intel StrongARM */
435 /* IA64 ==> Intel IA64 */
436 /* (e.g. Itanium) */
437
438
439/*
440 * For each architecture and OS, the following need to be defined:
441 *
442 * CPP_WORD_SZ is a simple integer constant representing the word size.
443 * in bits. We assume byte addressibility, where a byte has 8 bits.
444 * We also assume CPP_WORD_SZ is either 32 or 64.
445 * (We care about the length of pointers, not hardware
446 * bus widths. Thus a 64 bit processor with a C compiler that uses
447 * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
448 *
449 * MACH_TYPE is a string representation of the machine type.
450 * OS_TYPE is analogous for the OS.
451 *
452 * ALIGNMENT is the largest N, such that
453 * all pointer are guaranteed to be aligned on N byte boundaries.
454 * defining it to be 1 will always work, but perform poorly.
455 *
456 * DATASTART is the beginning of the data segment.
457 * On UNIX systems, the collector will scan the area between DATASTART
458 * and DATAEND for root pointers.
459 *
460 * DATAEND, if not &end.
461 *
462 * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
463 * the pointer size.
464 *
465 * STACKBOTTOM is the cool end of the stack, which is usually the
466 * highest address in the stack.
467 * Under PCR or OS/2, we have other ways of finding thread stacks.
468 * For each machine, the following should:
2485c279 469 * 1) define SCM_STACK_GROWS_UP if the stack grows toward higher addresses, and
155415a5
MV		 470 * 2) define exactly one of
471 * STACKBOTTOM (should be defined to be an expression)
472 * HEURISTIC1
473 * HEURISTIC2
474 * If either of the last two macros are defined, then STACKBOTTOM is computed
475 * during collector startup using one of the following two heuristics:
476 * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
477 * the next multiple of STACK_GRAN.
478 * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
2485c279 479 * in small steps (decrement if SCM_STACK_GROWS_UP), and read the value
155415a5
MV		 480 * at each location. Remember the value when the first
481 * Segmentation violation or Bus error is signalled. Round that
482 * to the nearest plausible page boundary, and use that instead
483 * of STACKBOTTOM.
484 *
485 * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
486 * the value of environ is a pointer that can serve as STACKBOTTOM.
487 * I expect that HEURISTIC2 can be replaced by this approach, which
9ec1e770 488 * interferes far less with debugging.
155415a5
MV		 489 *
490 * If no expression for STACKBOTTOM can be found, and neither of the above
491 * heuristics are usable, the collector can still be used with all of the above
492 * undefined, provided one of the following is done:
493 * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
494 * without reference to STACKBOTTOM. This is appropriate for use in
495 * conjunction with thread packages, since there will be multiple stacks.
496 * (Allocating thread stacks in the heap, and treating them as ordinary
497 * heap data objects is also possible as a last resort. However, this is
498 * likely to introduce significant amounts of excess storage retention
499 * unless the dead parts of the thread stacks are periodically cleared.)
500 * 2) Client code may set GC_stackbottom before calling any GC_ routines.
501 * If the author of the client code controls the main program, this is
502 * easily accomplished by introducing a new main program, setting
503 * GC_stackbottom to the address of a local variable, and then calling
504 * the original main program. The new main program would read something
505 * like:
506 *
507 * # include "gc_private.h"
508 *
509 * main(argc, argv, envp)
510 * int argc;
511 * char **argv, **envp;
512 * {
513 * int dummy;
514 *
515 * GC_stackbottom = (ptr_t)(&dummy);
516 * return(real_main(argc, argv, envp));
517 * }
518 *
519 *
520 * Each architecture may also define the style of virtual dirty bit
521 * implementation to be used:
522 * MPROTECT_VDB: Write protect the heap and catch faults.
523 * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
524 *
525 * An architecture may define DYNAMIC_LOADING if dynamic_load.c
526 * defined GC_register_dynamic_libraries() for the architecture.
527 *
528 * An architecture may define PREFETCH(x) to preload the cache with *x.
529 * This defaults to a no-op.
530 *
531 * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
532 *
533 * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
534 * clear the two words at GC_malloc-aligned address x. By default,
535 * word stores of 0 are used instead.
536 */
537
538
539# define STACK_GRAN 0x1000000
540# ifdef M68K
541# define MACH_TYPE "M68K"
542# define ALIGNMENT 2
543# ifdef OPENBSD
544# define OS_TYPE "OPENBSD"
545# define HEURISTIC2
546 extern char etext;
547# define DATASTART ((ptr_t)(&etext))
548# endif
549# ifdef NETBSD
550# define OS_TYPE "NETBSD"
551# define HEURISTIC2
552 extern char etext;
553# define DATASTART ((ptr_t)(&etext))
554# endif
555# ifdef LINUX
556# define OS_TYPE "LINUX"
557# define STACKBOTTOM ((ptr_t)0xf0000000)
558# define MPROTECT_VDB
559# ifdef __ELF__
560# define DYNAMIC_LOADING
561 extern char **__environ;
562# define DATASTART ((ptr_t)(&__environ))
563 /* hideous kludge: __environ is the first */
564 /* word in crt0.o, and delimits the start */
565 /* of the data segment, no matter which */
566 /* ld options were passed through. */
567 /* We could use _etext instead, but that */
568 /* would include .rodata, which may */
569 /* contain large read-only data tables */
570 /* that we'd rather not scan. */
571 extern int _end;
572# define DATAEND (&_end)
573# else
574 extern int etext;
575# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
576# endif
577# endif
578# ifdef SUNOS4
579# define OS_TYPE "SUNOS4"
580 extern char etext;
581# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
582# define HEURISTIC1 /* differs */
583# define DYNAMIC_LOADING
584# endif
585# ifdef HP
586# define OS_TYPE "HP"
587 extern char etext;
588# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
589# define STACKBOTTOM ((ptr_t) 0xffeffffc)
590 /* empirically determined. seems to work. */
591# include <unistd.h>
592# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
593# endif
594# ifdef SYSV
595# define OS_TYPE "SYSV"
596 extern etext;
597# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
598 & ~0x3fffff) \
599 +((word)&etext & 0x1fff))
600 /* This only works for shared-text binaries with magic number 0413.
601 The other sorts of SysV binaries put the data at the end of the text,
602 in which case the default of &etext would work. Unfortunately,
603 handling both would require having the magic-number available.
604 -- Parag
605 */
606# define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
607 /* The stack starts at the top of memory, but */
608 /* 0x0 cannot be used as setjump_test complains */
609 /* that the stack direction is incorrect. Two */
610 /* bytes down from 0x0 should be safe enough. */
611 /* --Parag */
612# include <sys/mmu.h>
613# define GETPAGESIZE() PAGESIZE /* Is this still right? */
614# endif
615# ifdef AMIGA
616# define OS_TYPE "AMIGA"
617 /* STACKBOTTOM and DATASTART handled specially */
618 /* in os_dep.c */
619# define DATAEND /* not needed */
620# define GETPAGESIZE() 4096
621# endif
622# ifdef MACOS
623# ifndef __LOWMEM__
624# include <LowMem.h>
625# endif
626# define OS_TYPE "MACOS"
627 /* see os_dep.c for details of global data segments. */
628# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
629# define DATAEND /* not needed */
630# define GETPAGESIZE() 4096
631# endif
632# ifdef NEXT
633# define OS_TYPE "NEXT"
634# define DATASTART ((ptr_t) get_etext())
635# define STACKBOTTOM ((ptr_t) 0x4000000)
636# define DATAEND /* not needed */
637# endif
638# endif
639
640# ifdef POWERPC
641# define MACH_TYPE "POWERPC"
642# ifdef MACOS
643# define ALIGNMENT 2 /* Still necessary? Could it be 4? */
644# ifndef __LOWMEM__
645# include <LowMem.h>
646# endif
647# define OS_TYPE "MACOS"
648 /* see os_dep.c for details of global data segments. */
649# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
650# define DATAEND /* not needed */
651# endif
652# ifdef LINUX
653# define ALIGNMENT 4 /* Guess. Can someone verify? */
654 /* This was 2, but that didn't sound right. */
655# define OS_TYPE "LINUX"
656# define HEURISTIC1
657# define DYNAMIC_LOADING
658# undef STACK_GRAN
659# define STACK_GRAN 0x10000000
660 /* Stack usually starts at 0x80000000 */
661# define LINUX_DATA_START
662 extern int _end;
663# define DATAEND (&_end)
664# endif
665# ifdef MACOSX
666# define ALIGNMENT 4
667# define OS_TYPE "MACOSX"
668# define DATASTART ((ptr_t) get_etext())
669# define STACKBOTTOM ((ptr_t) 0xc0000000)
670# define DATAEND /* not needed */
671# endif
672# endif
673
674# ifdef VAX
675# define MACH_TYPE "VAX"
676# define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
677 extern char etext;
678# define DATASTART ((ptr_t)(&etext))
679# ifdef BSD
680# define OS_TYPE "BSD"
681# define HEURISTIC1
682 /* HEURISTIC2 may be OK, but it's hard to test. */
683# endif
684# ifdef ULTRIX
685# define OS_TYPE "ULTRIX"
686# define STACKBOTTOM ((ptr_t) 0x7fffc800)
687# endif
688# endif
689
690# ifdef RT
691# define MACH_TYPE "RT"
692# define ALIGNMENT 4
693# define DATASTART ((ptr_t) 0x10000000)
694# define STACKBOTTOM ((ptr_t) 0x1fffd800)
695# endif
696
697# ifdef SPARC
698# define MACH_TYPE "SPARC"
699# define ALIGNMENT 4 /* Required by hardware */
700# define ALIGN_DOUBLE
701 extern int etext;
702# ifdef SUNOS5
703# define OS_TYPE "SUNOS5"
704 extern int _etext;
705 extern int _end;
706 extern char * GC_SysVGetDataStart();
707# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
708# define DATAEND (&_end)
709# ifndef USE_MMAP
710# define USE_MMAP
711# endif
712# ifdef USE_MMAP
713# define HEAP_START (ptr_t)0x40000000
714# else
715# define HEAP_START DATAEND
716# endif
717# define PROC_VDB
718/* HEURISTIC1 reportedly no longer works under 2.7. Thus we */
719/* switched to HEURISTIC2, eventhough it creates some debugging */
720/* issues. */
721# define HEURISTIC2
722# include <unistd.h>
723# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
724 /* getpagesize() appeared to be missing from at least one */
725 /* Solaris 5.4 installation. Weird. */
726# define DYNAMIC_LOADING
727# endif
728# ifdef SUNOS4
729# define OS_TYPE "SUNOS4"
730 /* [If you have a weak stomach, don't read this.] */
731 /* We would like to use: */
732/* # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
733 /* This fails occasionally, due to an ancient, but very */
734 /* persistent ld bug. &etext is set 32 bytes too high. */
735 /* We instead read the text segment size from the a.out */
736 /* header, which happens to be mapped into our address space */
737 /* at the start of the text segment. The detective work here */
738 /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
739 /* Serpette of INRIA. */
740 /* This assumes ZMAGIC, i.e. demand-loadable executables. */
741# define TEXTSTART 0x2000
742# define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
743# define MPROTECT_VDB
744# define HEURISTIC1
745# define DYNAMIC_LOADING
746# endif
747# ifdef DRSNX
748# define CPP_WORDSZ 32
749# define OS_TYPE "DRSNX"
750 extern char * GC_SysVGetDataStart();
751 extern int etext;
752# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
753# define MPROTECT_VDB
754# define STACKBOTTOM ((ptr_t) 0xdfff0000)
755# define DYNAMIC_LOADING
756# endif
757# ifdef LINUX
758# define OS_TYPE "LINUX"
759# ifdef __ELF__
760# define LINUX_DATA_START
761# define DYNAMIC_LOADING
762# else
763 Linux Sparc non elf ?
764# endif
765 extern int _end;
766# define DATAEND (&_end)
767# define SVR4
768# define STACKBOTTOM ((ptr_t) 0xf0000000)
769# endif
770# ifdef OPENBSD
771# define OS_TYPE "OPENBSD"
772# define STACKBOTTOM ((ptr_t) 0xf8000000)
773# define DATASTART ((ptr_t)(&etext))
774# endif
775# endif
776
777# ifdef I386
778# define MACH_TYPE "I386"
779# define ALIGNMENT 4 /* Appears to hold for all "32 bit" compilers */
780 /* except Borland. The -a4 option fixes */
781 /* Borland. */
782 /* Ivan Demakov: For Watcom the option is -zp4. */
783# ifndef SMALL_CONFIG
784# define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
785 /* improvement on Pentiums. */
786# endif
787# ifdef SEQUENT
788# define OS_TYPE "SEQUENT"
789 extern int etext;
790# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
9ec1e770 791# define STACKBOTTOM ((ptr_t) 0x3ffff000)
155415a5
MV		 792# endif
793# ifdef SUNOS5
794# define OS_TYPE "SUNOS5"
795 extern int etext, _start;
796 extern char * GC_SysVGetDataStart();
797# define DATASTART GC_SysVGetDataStart(0x1000, &etext)
798# define STACKBOTTOM ((ptr_t)(&_start))
799/** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
800/*# define PROC_VDB*/
801# define DYNAMIC_LOADING
802# ifndef USE_MMAP
803# define USE_MMAP
804# endif
805# ifdef USE_MMAP
806# define HEAP_START (ptr_t)0x40000000
807# else
808# define HEAP_START DATAEND
809# endif
810# endif
811# ifdef SCO
812# define OS_TYPE "SCO"
813 extern int etext;
814# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
815 & ~0x3fffff) \
816 +((word)&etext & 0xfff))
817# define STACKBOTTOM ((ptr_t) 0x7ffffffc)
818# endif
819# ifdef SCO_ELF
820# define OS_TYPE "SCO_ELF"
821 extern int etext;
822# define DATASTART ((ptr_t)(&etext))
823# define STACKBOTTOM ((ptr_t) 0x08048000)
824# define DYNAMIC_LOADING
825# define ELF_CLASS ELFCLASS32
826# endif
827# ifdef LINUX
828# define OS_TYPE "LINUX"
829# define LINUX_STACKBOTTOM
830# if 0
831# define HEURISTIC1
832# undef STACK_GRAN
833# define STACK_GRAN 0x10000000
834 /* STACKBOTTOM is usually 0xc0000000, but this changes with */
835 /* different kernel configurations. In particular, systems */
836 /* with 2GB physical memory will usually move the user */
837 /* address space limit, and hence initial SP to 0x80000000. */
838# endif
839# if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
840# define MPROTECT_VDB
841# else
842 /* We seem to get random errors in incremental mode, */
843 /* possibly because Linux threads is itself a malloc client */
844 /* and can't deal with the signals. */
845# endif
846# ifdef __ELF__
847# define DYNAMIC_LOADING
848# ifdef UNDEFINED /* includes ro data */
849 extern int _etext;
850# define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
851# endif
852# include <features.h>
853# if defined(__GLIBC__) && __GLIBC__ >= 2
854# define LINUX_DATA_START
855# else
856 extern char **__environ;
857# define DATASTART ((ptr_t)(&__environ))
858 /* hideous kludge: __environ is the first */
859 /* word in crt0.o, and delimits the start */
860 /* of the data segment, no matter which */
861 /* ld options were passed through. */
862 /* We could use _etext instead, but that */
863 /* would include .rodata, which may */
864 /* contain large read-only data tables */
865 /* that we'd rather not scan. */
866# endif
867 extern int _end;
868# define DATAEND (&_end)
869# else
870 extern int etext;
871# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
872# endif
873# ifdef USE_I686_PREFETCH
874# define PREFETCH(x) \
875 __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))
876 /* Empirically prefetcht0 is much more effective at reducing */
877 /* cache miss stalls for the targetted load instructions. But it */
878 /* seems to interfere enough with other cache traffic that the net */
879 /* result is worse than prefetchnta. */
9ec1e770 880# if 0
155415a5
MV		 881 /* Using prefetches for write seems to have a slight negative */
882 /* impact on performance, at least for a PIII/500. */
883# define PREFETCH_FOR_WRITE(x) \
884 __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))
885# endif
886# endif
887# ifdef USE_3DNOW_PREFETCH
888# define PREFETCH(x) \
889 __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))
9ec1e770 890# define PREFETCH_FOR_WRITE(x)
155415a5
MV		 891 __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))
892# endif
893# endif
894# ifdef CYGWIN32
895# define OS_TYPE "CYGWIN32"
896 extern int _data_start__;
897 extern int _data_end__;
898 extern int _bss_start__;
899 extern int _bss_end__;
900 /* For binutils 2.9.1, we have */
901 /* DATASTART = _data_start__ */
902 /* DATAEND = _bss_end__ */
903 /* whereas for some earlier versions it was */
904 /* DATASTART = _bss_start__ */
905 /* DATAEND = _data_end__ */
906 /* To get it right for both, we take the */
907 /* minumum/maximum of the two. */
908# define MAX(x,y) ((x) > (y) ? (x) : (y))
909# define MIN(x,y) ((x) < (y) ? (x) : (y))
910# define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
911# define DATAEND ((ptr_t) MAX(&_data_end__, &_bss_end__))
912# undef STACK_GRAN
913# define STACK_GRAN 0x10000
914# define HEURISTIC1
915# endif
916# ifdef OS2
917# define OS_TYPE "OS2"
918 /* STACKBOTTOM and DATASTART are handled specially in */
919 /* os_dep.c. OS2 actually has the right */
920 /* system call! */
921# define DATAEND /* not needed */
922# endif
923# ifdef MSWIN32
924# define OS_TYPE "MSWIN32"
925 /* STACKBOTTOM and DATASTART are handled specially in */
926 /* os_dep.c. */
927# ifndef __WATCOMC__
928# define MPROTECT_VDB
929# endif
930# define DATAEND /* not needed */
931# endif
932# ifdef DJGPP
933# define OS_TYPE "DJGPP"
934# include "stubinfo.h"
935 extern int etext;
936 extern int _stklen;
937 extern int __djgpp_stack_limit;
938# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
939/* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
940 + _stklen)) */
941# define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
942 /* This may not be right. */
943# endif
944# ifdef OPENBSD
945# define OS_TYPE "OPENBSD"
946# endif
947# ifdef FREEBSD
948# define OS_TYPE "FREEBSD"
949# define MPROTECT_VDB
950# endif
951# ifdef NETBSD
952# define OS_TYPE "NETBSD"
953# endif
954# ifdef THREE86BSD
955# define OS_TYPE "THREE86BSD"
956# endif
957# ifdef BSDI
958# define OS_TYPE "BSDI"
959# endif
960# if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
961 || defined(THREE86BSD) || defined(BSDI)
962# define HEURISTIC2
963 extern char etext;
964# define DATASTART ((ptr_t)(&etext))
965# endif
966# ifdef NEXT
967# define OS_TYPE "NEXT"
968# define DATASTART ((ptr_t) get_etext())
969# define STACKBOTTOM ((ptr_t)0xc0000000)
970# define DATAEND /* not needed */
971# endif
972# ifdef DOS4GW
973# define OS_TYPE "DOS4GW"
974 extern long __nullarea;
975 extern char _end;
976 extern char *_STACKTOP;
977 /* Depending on calling conventions Watcom C either precedes
978 or does not precedes with undescore names of C-variables.
979 Make sure startup code variables always have the same names. */
980 #pragma aux __nullarea "*";
981 #pragma aux _end "*";
982# define STACKBOTTOM ((ptr_t) _STACKTOP)
983 /* confused? me too. */
984# define DATASTART ((ptr_t) &__nullarea)
985# define DATAEND ((ptr_t) &_end)
986# endif
9c52b218
RB		 987# ifdef GNU
988# define OS_TYPE "GNU"
989# endif
155415a5
MV		 990# endif
991
992# ifdef NS32K
993# define MACH_TYPE "NS32K"
994# define ALIGNMENT 4
995 extern char **environ;
996# define DATASTART ((ptr_t)(&environ))
997 /* hideous kludge: environ is the first */
998 /* word in crt0.o, and delimits the start */
999 /* of the data segment, no matter which */
1000 /* ld options were passed through. */
1001# define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
1002# endif
1003
1004# ifdef MIPS
1005# define MACH_TYPE "MIPS"
1006/* # define STACKBOTTOM ((ptr_t)0x7fff8000) sometimes also works. */
1007# ifdef LINUX
1008 /* This was developed for a linuxce style platform. Probably */
1009 /* needs to be tweaked for workstation class machines. */
1010# define OS_TYPE "LINUX"
1011 extern int __data_start;
1012# define DATASTART ((ptr_t)(&__data_start))
1013# define ALIGNMENT 4
1014# define USE_GENERIC_PUSH_REGS 1
1015# define STACKBOTTOM 0x80000000
1016 /* In many cases, this should probably use LINUX_STACKBOTTOM */
1017 /* instead. But some kernel versions seem to give the wrong */
1018 /* value from /proc. */
1019# endif /* Linux */
1020# ifdef ULTRIX
1021# define HEURISTIC2
1022# define DATASTART (ptr_t)0x10000000
1023 /* Could probably be slightly higher since */
1024 /* startup code allocates lots of stuff. */
1025# define OS_TYPE "ULTRIX"
1026# define ALIGNMENT 4
1027# endif
1028# ifdef RISCOS
1029# define HEURISTIC2
1030# define DATASTART (ptr_t)0x10000000
1031# define OS_TYPE "RISCOS"
1032# define ALIGNMENT 4 /* Required by hardware */
1033# endif
1034# ifdef IRIX5
1035# define HEURISTIC2
1036 extern int _fdata;
1037# define DATASTART ((ptr_t)(&_fdata))
1038# ifdef USE_MMAP
1039# define HEAP_START (ptr_t)0x30000000
1040# else
1041# define HEAP_START DATASTART
1042# endif
1043 /* Lowest plausible heap address. */
1044 /* In the MMAP case, we map there. */
1045 /* In either case it is used to identify */
1046 /* heap sections so they're not */
1047 /* considered as roots. */
1048# define OS_TYPE "IRIX5"
1049# define MPROTECT_VDB
1050# ifdef _MIPS_SZPTR
1051# define CPP_WORDSZ _MIPS_SZPTR
1052# define ALIGNMENT (_MIPS_SZPTR/8)
1053# if CPP_WORDSZ != 64
1054# define ALIGN_DOUBLE
1055# endif
1056# else
1057# define ALIGNMENT 4
1058# define ALIGN_DOUBLE
1059# endif
1060# define DYNAMIC_LOADING
1061# endif
1062# endif
1063
1064# ifdef RS6000
1065# define MACH_TYPE "RS6000"
1066# define ALIGNMENT 4
1067# define DATASTART ((ptr_t)0x20000000)
1068 extern int errno;
1069# define STACKBOTTOM ((ptr_t)((ulong)&errno))
1070# define DYNAMIC_LOADING
1071 /* For really old versions of AIX, this may have to be removed. */
1072# endif
1073
1074# ifdef HP_PA
1075 /* OS is assumed to be HP/UX */
1076# define MACH_TYPE "HP_PA"
1077# define OS_TYPE "HPUX"
1078# ifdef __LP64__
1079# define CPP_WORDSZ 64
1080# define ALIGNMENT 8
1081# else
1082# define CPP_WORDSZ 32
1083# define ALIGNMENT 4
1084# define ALIGN_DOUBLE
1085# endif
1086 extern int __data_start;
1087# define DATASTART ((ptr_t)(&__data_start))
1088# if 0
1089 /* The following appears to work for 7xx systems running HP/UX */
1090 /* 9.xx Furthermore, it might result in much faster */
1091 /* collections than HEURISTIC2, which may involve scanning */
1092 /* segments that directly precede the stack. It is not the */
1093 /* default, since it may not work on older machine/OS */
1094 /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1095 /* this.) */
1096# define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1097# else
1098 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1099 /* to this. We'll probably do this on other platforms, too. */
1100 /* For now I'll use it where I can test it. */
1101 extern char ** environ;
1102# define STACKBOTTOM ((ptr_t)environ)
1103# endif
2485c279 1104# ifndef SCM_STACK_GROWS_UP /* don't fight with scmconfig.h */
91b17416 1105# define SCM_STACK_GROWS_UP 1
2485c279 1106# endif
155415a5
MV		 1107# define DYNAMIC_LOADING
1108# ifndef HPUX_THREADS
1109# define MPROTECT_VDB
1110# endif
1111# include <unistd.h>
1112# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1113# endif
1114
1115# ifdef ALPHA
1116# define MACH_TYPE "ALPHA"
1117# define ALIGNMENT 8
1118# define USE_GENERIC_PUSH_REGS
1119 /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1120 /* fp registers in some cases when the target is a 21264. The assembly */
1121 /* code doesn't handle that yet, and version dependencies make that a */
1122 /* bit tricky. Do the easy thing for now. */
1123# ifdef OSF1
1124# define OS_TYPE "OSF1"
1125# define DATASTART ((ptr_t) 0x140000000)
1126 extern _end;
1127# define DATAEND ((ptr_t) &_end)
1128# define HEURISTIC2
1129 /* Normally HEURISTIC2 is too conervative, since */
1130 /* the text segment immediately follows the stack. */
1131 /* Hence we give an upper pound. */
1132 extern int __start;
1133# define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
1134# define CPP_WORDSZ 64
1135# define MPROTECT_VDB
1136# define DYNAMIC_LOADING
1137# endif
1138# ifdef LINUX
1139# define OS_TYPE "LINUX"
1140# define CPP_WORDSZ 64
1141# define STACKBOTTOM ((ptr_t) 0x120000000)
1142# ifdef __ELF__
1143# define LINUX_DATA_START
1144# define DYNAMIC_LOADING
1145 /* This doesn't work if the collector is in a dynamic library. */
1146# else
1147# define DATASTART ((ptr_t) 0x140000000)
1148# endif
1149 extern int _end;
1150# define DATAEND (&_end)
1151# define MPROTECT_VDB
1152 /* Has only been superficially tested. May not */
1153 /* work on all versions. */
1154# endif
1155# endif
1156
1157# ifdef IA64
1158# define MACH_TYPE "IA64"
1159# define ALIGN_DOUBLE
1160 /* Requires 16 byte alignment for malloc */
1161# define ALIGNMENT 8
1162# define USE_GENERIC_PUSH_REGS
1163 /* We need to get preserved registers in addition to register windows. */
1164 /* That's easiest to do with setjmp. */
1165# ifdef HPUX
1166 --> needs work
1167# endif
1168# ifdef LINUX
1169# define OS_TYPE "LINUX"
1170# define CPP_WORDSZ 64
1171 /* This should really be done through /proc, but that */
1172 /* requires we run on an IA64 kernel. */
1173# define STACKBOTTOM ((ptr_t) 0xa000000000000000l)
1174 /* We also need the base address of the register stack */
1175 /* backing store. There is probably a better way to */
1176 /* get that, too ... */
1177# define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l)
1178# if 1
1179# define SEARCH_FOR_DATA_START
1180# define DATASTART GC_data_start
1181# else
1182 extern int data_start;
1183# define DATASTART ((ptr_t)(&data_start))
1184# endif
1185# define DYNAMIC_LOADING
1186# define MPROTECT_VDB
1187 /* Requires Linux 2.3.47 or later. */
1188 extern int _end;
1189# define DATAEND (&_end)
1190# define PREFETCH(x) \
1191 __asm__ (" lfetch [%0]": : "r"((void *)(x)))
1192# define PREFETCH_FOR_WRITE(x) \
1193 __asm__ (" lfetch.excl [%0]": : "r"((void *)(x)))
1194# define CLEAR_DOUBLE(x) \
1195 __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1196# endif
1197# endif
1198
1199# ifdef M88K
1200# define MACH_TYPE "M88K"
1201# define ALIGNMENT 4
1202# define ALIGN_DOUBLE
1203 extern int etext;
1204# ifdef CX_UX
1205# define OS_TYPE "CX_UX"
1206# define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1207# endif
1208# ifdef DGUX
1209# define OS_TYPE "DGUX"
1210 extern char * GC_SysVGetDataStart();
1211# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
1212# endif
1213# define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1214# endif
1215
1216# ifdef S370
1217# define MACH_TYPE "S370"
1218# define OS_TYPE "UTS4"
1219# define ALIGNMENT 4 /* Required by hardware */
1220 extern int etext;
1221 extern int _etext;
1222 extern int _end;
1223 extern char * GC_SysVGetDataStart();
1224# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
1225# define DATAEND (&_end)
1226# define HEURISTIC2
1227# endif
1228
1229# if defined(PJ)
1230# define ALIGNMENT 4
1231 extern int _etext;
1232# define DATASTART ((ptr_t)(&_etext))
1233# define HEURISTIC1
1234# endif
1235
1236# ifdef ARM32
1237# define CPP_WORDSZ 32
1238# define MACH_TYPE "ARM32"
1239# define ALIGNMENT 4
1240# ifdef NETBSD
1241# define OS_TYPE "NETBSD"
1242# define HEURISTIC2
1243 extern char etext;
1244# define DATASTART ((ptr_t)(&etext))
1245# define USE_GENERIC_PUSH_REGS
1246# endif
1247# ifdef LINUX
1248# define OS_TYPE "LINUX"
1249# define HEURISTIC1
1250# undef STACK_GRAN
1251# define STACK_GRAN 0x10000000
1252# define USE_GENERIC_PUSH_REGS
1253# ifdef __ELF__
1254# define DYNAMIC_LOADING
1255# include <features.h>
1256# if defined(__GLIBC__) && __GLIBC__ >= 2
1257# define LINUX_DATA_START
1258# else
1259 extern char **__environ;
1260# define DATASTART ((ptr_t)(&__environ))
1261 /* hideous kludge: __environ is the first */
1262 /* word in crt0.o, and delimits the start */
1263 /* of the data segment, no matter which */
1264 /* ld options were passed through. */
1265 /* We could use _etext instead, but that */
1266 /* would include .rodata, which may */
1267 /* contain large read-only data tables */
1268 /* that we'd rather not scan. */
1269# endif
1270 extern int _end;
1271# define DATAEND (&_end)
1272# else
1273 extern int etext;
1274# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
1275# endif
1276# endif
1277#endif
1278
1279#ifdef LINUX_DATA_START
1280 /* Some Linux distributions arrange to define __data_start. Some */
1281 /* define data_start as a weak symbol. The latter is technically */
1282 /* broken, since the user program may define data_start, in which */
1283 /* case we lose. Nonetheless, we try both, prefering __data_start. */
1284 /* We assume gcc. */
1285# pragma weak __data_start
1286 extern int __data_start;
1287# pragma weak data_start
1288 extern int data_start;
1289# define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
1290#endif
1291
91b17416
RB		 1292# if SCM_STACK_GROWS_UP
1293# define STACK_GROWS_DOWN 0
1294# else
1295# define STACK_GROWS_DOWN 1
1296#endif
155415a5
MV		 1297
1298# ifndef CPP_WORDSZ
1299# define CPP_WORDSZ 32
1300# endif
1301
1302# ifndef OS_TYPE
1303# define OS_TYPE ""
1304# endif
1305
1306# ifndef DATAEND
1307 extern int end;
1308# define DATAEND (&end)
1309# endif
1310
1311# if defined(SVR4) && !defined(GETPAGESIZE)
1312# include <unistd.h>
1313# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1314# endif
1315
1316# ifndef GETPAGESIZE
1317# if defined(SUNOS5) || defined(IRIX5)
1318# include <unistd.h>
1319# endif
1320# define GETPAGESIZE() getpagesize()
1321# endif
1322
1323# if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
1324 /* OS has SVR4 generic features. Probably others also qualify. */
1325# define SVR4
1326# endif
1327
1328# if defined(SUNOS5) || defined(DRSNX)
1329 /* OS has SUNOS5 style semi-undocumented interface to dynamic */
1330 /* loader. */
1331# define SUNOS5DL
1332 /* OS has SUNOS5 style signal handlers. */
1333# define SUNOS5SIGS
1334# endif
1335
1336# if defined(HPUX)
1337# define SUNOS5SIGS
1338# endif
1339
1340# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
1341 -> bad word size
1342# endif
1343
1344# ifdef PCR
1345# undef DYNAMIC_LOADING
1346# undef STACKBOTTOM
1347# undef HEURISTIC1
1348# undef HEURISTIC2
1349# undef PROC_VDB
1350# undef MPROTECT_VDB
1351# define PCR_VDB
1352# endif
1353
1354# ifdef SRC_M3
1355/* Postponed for now. */
1356# undef PROC_VDB
1357# undef MPROTECT_VDB
1358# endif
1359
1360# ifdef SMALL_CONFIG
1361/* Presumably not worth the space it takes. */
1362# undef PROC_VDB
1363# undef MPROTECT_VDB
1364# endif
1365
1366# ifdef USE_MUNMAP
1367# undef MPROTECT_VDB /* Can't deal with address space holes. */
1368# endif
1369
1370# if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
1371# define DEFAULT_VDB
1372# endif
1373
1374# ifndef PREFETCH
1375# define PREFETCH(x)
1376# define NO_PREFETCH
1377# endif
1378
1379# ifndef PREFETCH_FOR_WRITE
1380# define PREFETCH_FOR_WRITE(x)
1381# define NO_PREFETCH_FOR_WRITE
1382# endif
1383
1384# ifndef CACHE_LINE_SIZE
1385# define CACHE_LINE_SIZE 32 /* Wild guess */
1386# endif
1387
1388# ifndef CLEAR_DOUBLE
1389# define CLEAR_DOUBLE(x) \
1390 ((word*)x)[0] = 0; \
1391 ((word*)x)[1] = 0;
1392# endif /* CLEAR_DOUBLE */
1393
1394# if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
1395# define SOLARIS_THREADS
1396# endif
1397# if defined(IRIX_THREADS) && !defined(IRIX5)
1398--> inconsistent configuration
1399# endif
1400# if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
1401--> inconsistent configuration
1402# endif
1403# if defined(LINUX_THREADS) && !defined(LINUX)
1404--> inconsistent configuration
1405# endif
1406# if defined(SOLARIS_THREADS) && !defined(SUNOS5)
1407--> inconsistent configuration
1408# endif
1409# if defined(HPUX_THREADS) && !defined(HPUX)
1410--> inconsistent configuration
1411# endif
1412# if defined(PCR) || defined(SRC_M3) || \
1413 defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
1414 defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
1415 defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
1416# define THREADS
1417# endif
1418
1419# if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
1420 || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
1421 /* Use setjmp based hack to mark from callee-save registers. */
1422# define USE_GENERIC_PUSH_REGS
1423# endif
1424# if defined(SPARC) && !defined(LINUX)
1425# define SAVE_CALL_CHAIN
1426# define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
1427 /* include assembly code to do it well. */
1428# endif
1429
1430# if defined(LINUX) && !defined(POWERPC)
bc286d9f 1431
9ec1e770 1432# if 0
155415a5
MV		 1433# include <linux/version.h>
1434# if (LINUX_VERSION_CODE <= 0x10400)
bc286d9f 1435 /* Ugly hack to get struct sigcontext_struct definition. Required */
155415a5
MV		 1436 /* for some early 1.3.X releases. Will hopefully go away soon. */
1437 /* in some later Linux releases, asm/sigcontext.h may have to */
1438 /* be included instead. */
1439# define __KERNEL__
1440# include <asm/signal.h>
1441# undef __KERNEL__
5159b336
MV		 1442# endif
1443
1444# else
bc286d9f 1445
155415a5
MV		 1446 /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
1447 /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
1448 /* prototypes, so we have to include the top-level sigcontext.h to */
1449 /* make sure the former gets defined to be the latter if appropriate. */
1450# include <features.h>
1451# if 2 <= __GLIBC__
1452# if 2 == __GLIBC__ && 0 == __GLIBC_MINOR__
1453 /* glibc 2.1 no longer has sigcontext.h. But signal.h */
1454 /* has the right declaration for glibc 2.1. */
1455# include <sigcontext.h>
1456# endif /* 0 == __GLIBC_MINOR__ */
1457# else /* not 2 <= __GLIBC__ */
1458 /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
1459 /* one. Check LINUX_VERSION_CODE to see which we should reference. */
1460# include <asm/sigcontext.h>
1461# endif /* 2 <= __GLIBC__ */
1462# endif
1463# endif
1464# if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
1465# include <sys/types.h>
1466# if !defined(MSWIN32) && !defined(SUNOS4)
1467# include <unistd.h>
1468# endif
1469# endif
1470
155415a5
MV		 1471# include <signal.h>
1472
1473/* Blatantly OS dependent routines, except for those that are related */
1474/* to dynamic loading. */
1475
1476# if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
1477# define NEED_FIND_LIMIT
1478# endif
1479
1480# if defined(IRIX_THREADS) || defined(HPUX_THREADS)
1481# define NEED_FIND_LIMIT
1482# endif
1483
1484# if (defined(SUNOS4) && defined(DYNAMIC_LOADING)) && !defined(PCR)
1485# define NEED_FIND_LIMIT
1486# endif
1487
1488# if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
1489# define NEED_FIND_LIMIT
1490# endif
1491
1492# if defined(LINUX) && \
1493 (defined(POWERPC) || defined(SPARC) || defined(ALPHA) || defined(IA64) \
1494 || defined(MIPS))
1495# define NEED_FIND_LIMIT
1496# endif
1497
1498#ifdef NEED_FIND_LIMIT
1499# include <setjmp.h>
1500#endif
1501
1502#ifdef FREEBSD
1503# include <machine/trap.h>
1504#endif
1505
1506#ifdef AMIGA
1507# include <proto/exec.h>
1508# include <proto/dos.h>
1509# include <dos/dosextens.h>
1510# include <workbench/startup.h>
1511#endif
1512
1513#ifdef MSWIN32
1514# define WIN32_LEAN_AND_MEAN
1515# define NOSERVICE
1516# include <windows.h>
1517#endif
1518
1519#ifdef MACOS
1520# include <Processes.h>
1521#endif
1522
1523#ifdef IRIX5
1524# include <sys/uio.h>
1525# include <malloc.h> /* for locking */
1526#endif
1527#ifdef USE_MMAP
1528# include <sys/types.h>
1529# include <sys/mman.h>
1530# include <sys/stat.h>
1531# include <fcntl.h>
1532#endif
1533
1534#ifdef SUNOS5SIGS
1535# include <sys/siginfo.h>
1536# undef setjmp
1537# undef longjmp
1538# define setjmp(env) sigsetjmp(env, 1)
1539# define longjmp(env, val) siglongjmp(env, val)
1540# define jmp_buf sigjmp_buf
1541#endif
1542
1543#ifdef DJGPP
1544 /* Apparently necessary for djgpp 2.01. May casuse problems with */
1545 /* other versions. */
1546 typedef long unsigned int caddr_t;
1547#endif
1548
1549#ifdef PCR
1550# include "il/PCR_IL.h"
1551# include "th/PCR_ThCtl.h"
1552# include "mm/PCR_MM.h"
1553#endif
1554
1555#if !defined(NO_EXECUTE_PERMISSION)
1556# define OPT_PROT_EXEC PROT_EXEC
1557#else
1558# define OPT_PROT_EXEC 0
1559#endif
1560
1561# ifdef OS2
1562
1563# include <stddef.h>
1564
1565# if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
1566
1567# else /* IBM's compiler */
1568
1569/* A kludge to get around what appears to be a header file bug */
1570# ifndef WORD
1571# define WORD unsigned short
1572# endif
1573# ifndef DWORD
1574# define DWORD unsigned long
1575# endif
1576
1577# define EXE386 1
1578# include <newexe.h>
1579# include <exe386.h>
1580
1581# endif /* __IBMC__ */
1582
1583# define INCL_DOSEXCEPTIONS
1584# define INCL_DOSPROCESS
1585# define INCL_DOSERRORS
1586# define INCL_DOSMODULEMGR
1587# define INCL_DOSMEMMGR
1588# include <os2.h>
1589
1590# endif /*!OS/2 */
1591
9ec1e770
TTN		 1592/*
1593 * Find the base of the stack.
155415a5
MV		 1594 * Used only in single-threaded environment.
1595 * With threads, GC_mark_roots needs to know how to do this.
1596 * Called with allocator lock held.
1597 */
9ec1e770 1598# ifdef MSWIN32
155415a5
MV		 1599# define is_writable(prot) ((prot) == PAGE_READWRITE \
1600 || (prot) == PAGE_WRITECOPY \
1601 || (prot) == PAGE_EXECUTE_READWRITE \
1602 || (prot) == PAGE_EXECUTE_WRITECOPY)
1603/* Return the number of bytes that are writable starting at p. */
1604/* The pointer p is assumed to be page aligned. */
1605/* If base is not 0, *base becomes the beginning of the */
1606/* allocation region containing p. */
1607static word GC_get_writable_length(ptr_t p, ptr_t *base)
1608{
1609 MEMORY_BASIC_INFORMATION buf;
1610 word result;
1611 word protect;
9ec1e770 1612
155415a5
MV		 1613 result = VirtualQuery(p, &buf, sizeof(buf));
1614 if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
1615 if (base != 0) *base = (ptr_t)(buf.AllocationBase);
1616 protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
1617 if (!is_writable(protect)) {
1618 return(0);
1619 }
1620 if (buf.State != MEM_COMMIT) return(0);
1621 return(buf.RegionSize);
1622}
1623
1624void *scm_get_stack_base()
1625{
1626 int dummy;
1627 ptr_t sp = (ptr_t)(&dummy);
70f95333
MV		 1628 ptr_t trunc_sp;
1629 word size;
1630 static word GC_page_size = 0;
1631 if (!GC_page_size) {
1632 SYSTEM_INFO sysinfo;
1633 GetSystemInfo(&sysinfo);
1634 GC_page_size = sysinfo.dwPageSize;
1635 }
1636 trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
1637 size = GC_get_writable_length(trunc_sp, 0);
155415a5
MV		 1638 return(trunc_sp + size);
1639}
1640
1641
1642# else
1643
1644# ifdef OS2
1645
1646void *scm_get_stack_base()
1647{
1648 PTIB ptib;
1649 PPIB ppib;
9ec1e770 1650
155415a5
MV		 1651 if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
1652 GC_err_printf0("DosGetInfoBlocks failed\n");
1653 ABORT("DosGetInfoBlocks failed\n");
1654 }
1655 return((ptr_t)(ptib -> tib_pstacklimit));
1656}
1657
1658# else
1659
1660# ifdef AMIGA
1661
1662void *scm_get_stack_base()
1663{
1664 struct Process *proc = (struct Process*)SysBase->ThisTask;
9ec1e770 1665
155415a5
MV		 1666 /* Reference: Amiga Guru Book Pages: 42,567,574 */
1667 if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS
1668 && proc->pr_CLI != NULL) {
1669 /* first ULONG is StackSize */
1670 /*longPtr = proc->pr_ReturnAddr;
1671 size = longPtr[0];*/
1672
1673 return (char *)proc->pr_ReturnAddr + sizeof(ULONG);
1674 } else {
1675 return (char *)proc->pr_Task.tc_SPUpper;
1676 }
1677}
1678
1679#if 0 /* old version */
1680void *scm_get_stack_base()
1681{
1682 extern struct WBStartup *_WBenchMsg;
1683 extern long __base;
1684 extern long __stack;
1685 struct Task *task;
1686 struct Process *proc;
1687 struct CommandLineInterface *cli;
1688 long size;
1689
1690 if ((task = FindTask(0)) == 0) {
1691 GC_err_puts("Cannot find own task structure\n");
1692 ABORT("task missing");
1693 }
1694 proc = (struct Process *)task;
1695 cli = BADDR(proc->pr_CLI);
1696
1697 if (_WBenchMsg != 0 || cli == 0) {
1698 size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
1699 } else {
1700 size = cli->cli_DefaultStack * 4;
1701 }
1702 return (ptr_t)(__base + GC_max(size, __stack));
1703}
1704#endif /* 0 */
1705
1706# else /* !AMIGA, !OS2, ... */
1707
1708# ifdef NEED_FIND_LIMIT
1709 /* Some tools to implement HEURISTIC2 */
1710# define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
1711 /* static */ jmp_buf GC_jmp_buf;
9ec1e770 1712
155415a5
MV		 1713 /*ARGSUSED*/
1714 static void GC_fault_handler(sig)
1715 int sig;
1716 {
1717 longjmp(GC_jmp_buf, 1);
1718 }
1719
1720# ifdef __STDC__
1721 typedef void (*handler)(int);
1722# else
1723 typedef void (*handler)();
1724# endif
1725
1726# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1727 static struct sigaction old_segv_act;
1728# if defined(_sigargs) || defined(HPUX) /* !Irix6.x */
1729 static struct sigaction old_bus_act;
1730# endif
1731# else
1732 static handler old_segv_handler, old_bus_handler;
1733# endif
9ec1e770 1734
155415a5
MV		 1735 static void GC_setup_temporary_fault_handler()
1736 {
1737# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1738 struct sigaction act;
1739
1740 act.sa_handler = GC_fault_handler;
1741 act.sa_flags = SA_RESTART | SA_NODEFER;
1742 /* The presence of SA_NODEFER represents yet another gross */
1743 /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
1744 /* interact correctly with -lthread. We hide the confusion */
1745 /* by making sure that signal handling doesn't affect the */
1746 /* signal mask. */
1747
1748 (void) sigemptyset(&act.sa_mask);
1749# ifdef IRIX_THREADS
1750 /* Older versions have a bug related to retrieving and */
1751 /* and setting a handler at the same time. */
1752 (void) sigaction(SIGSEGV, 0, &old_segv_act);
1753 (void) sigaction(SIGSEGV, &act, 0);
1754# else
1755 (void) sigaction(SIGSEGV, &act, &old_segv_act);
1756# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1757 || defined(HPUX)
1758 /* Under Irix 5.x or HP/UX, we may get SIGBUS. */
1759 /* Pthreads doesn't exist under Irix 5.x, so we */
1760 /* don't have to worry in the threads case. */
1761 (void) sigaction(SIGBUS, &act, &old_bus_act);
1762# endif
1763# endif /* IRIX_THREADS */
1764# else
1765 old_segv_handler = signal(SIGSEGV, GC_fault_handler);
1766# ifdef SIGBUS
1767 old_bus_handler = signal(SIGBUS, GC_fault_handler);
1768# endif
1769# endif
1770 }
9ec1e770 1771
155415a5
MV		 1772 static void GC_reset_fault_handler()
1773 {
1774# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1775 (void) sigaction(SIGSEGV, &old_segv_act, 0);
1776# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1777 || defined(HPUX)
1778 (void) sigaction(SIGBUS, &old_bus_act, 0);
1779# endif
1780# else
1781 (void) signal(SIGSEGV, old_segv_handler);
1782# ifdef SIGBUS
1783 (void) signal(SIGBUS, old_bus_handler);
1784# endif
1785# endif
1786 }
1787
9ec1e770
TTN		 1788 /* Single argument version, robust against whole program analysis. */
1789 static void
1790 GC_noop1(x)
1791 word x;
1792 {
1793 static VOLATILE word sink;
1794 sink = x;
1795 }
1796
155415a5
MV		 1797 /* Return the first nonaddressible location > p (up) or */
1798 /* the smallest location q s.t. [q,p] is addressible (!up). */
1799 static ptr_t GC_find_limit(p, up)
1800 ptr_t p;
1801 GC_bool up;
1802 {
1803 static VOLATILE ptr_t result;
1804 /* Needs to be static, since otherwise it may not be */
1805 /* preserved across the longjmp. Can safely be */
1806 /* static since it's only called once, with the */
1807 /* allocation lock held. */
1808
1809
1810 GC_setup_temporary_fault_handler();
1811 if (setjmp(GC_jmp_buf) == 0) {
1812 result = (ptr_t)(((word)(p))
1813 & ~(MIN_PAGE_SIZE-1));
1814 for (;;) {
1815 if (up) {
1816 result += MIN_PAGE_SIZE;
1817 } else {
1818 result -= MIN_PAGE_SIZE;
1819 }
1820 GC_noop1((word)(*result));
1821 }
1822 }
1823 GC_reset_fault_handler();
1824 if (!up) {
1825 result += MIN_PAGE_SIZE;
1826 }
1827 return(result);
1828 }
d315ea8c 1829
155415a5
MV		 1830# endif
1831
1832#ifdef LINUX_STACKBOTTOM
1833
1834#include <sys/types.h>
1835#include <sys/stat.h>
1836#include <fcntl.h>
1837
1838# define STAT_SKIP 27 /* Number of fields preceding startstack */
1839 /* field in /proc/self/stat */
1840
1841 static ptr_t GC_linux_stack_base(void)
1842 {
1843 /* We read the stack base value from /proc/self/stat. We do this */
1844 /* using direct I/O system calls in order to avoid calling malloc */
9ec1e770 1845 /* in case REDIRECT_MALLOC is defined. */
155415a5
MV		 1846# define STAT_BUF_SIZE 4096
1847# ifdef USE_LD_WRAP
1848# define STAT_READ __real_read
1849# else
1850# define STAT_READ read
9ec1e770 1851# endif
155415a5
MV		 1852 char stat_buf[STAT_BUF_SIZE];
1853 int f;
1854 char c;
1855 word result = 0;
1856 size_t i, buf_offset = 0;
1857
1858 f = open("/proc/self/stat", O_RDONLY);
1859 if (f < 0 || STAT_READ(f, stat_buf, STAT_BUF_SIZE) < 2 * STAT_SKIP) {
1860 ABORT("Couldn't read /proc/self/stat");
1861 }
1862 c = stat_buf[buf_offset++];
1863 /* Skip the required number of fields. This number is hopefully */
1864 /* constant across all Linux implementations. */
1865 for (i = 0; i < STAT_SKIP; ++i) {
1866 while (isspace(c)) c = stat_buf[buf_offset++];
1867 while (!isspace(c)) c = stat_buf[buf_offset++];
1868 }
1869 while (isspace(c)) c = stat_buf[buf_offset++];
1870 while (isdigit(c)) {
1871 result *= 10;
1872 result += c - '0';
1873 c = stat_buf[buf_offset++];
1874 }
1875 close(f);
1876 if (result < 0x10000000) ABORT("Absurd stack bottom value");
1877 return (ptr_t)result;
1878 }
1879
1880#endif /* LINUX_STACKBOTTOM */
1881
1882void *scm_get_stack_base()
9500b5b9 1883{
155415a5 1884 word dummy;
537abaae
RB		 1885 void *result;
1886
1887 result = &dummy; /* initialize to silence compiler */
155415a5
MV		 1888
1889# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
1890
1891# ifdef STACKBOTTOM
1892 return(STACKBOTTOM);
1893# else
1894# ifdef HEURISTIC1
91b17416 1895# if STACK_GROWS_DOWN
155415a5
MV		 1896 result = (ptr_t)((((word)(&dummy))
1897 + STACKBOTTOM_ALIGNMENT_M1)
1898 & ~STACKBOTTOM_ALIGNMENT_M1);
1899# else
1900 result = (ptr_t)(((word)(&dummy))
1901 & ~STACKBOTTOM_ALIGNMENT_M1);
1902# endif
1903# endif /* HEURISTIC1 */
1904# ifdef LINUX_STACKBOTTOM
1905 result = GC_linux_stack_base();
1906# endif
1907# ifdef HEURISTIC2
91b17416 1908# if STACK_GROWS_DOWN
155415a5
MV		 1909 result = GC_find_limit((ptr_t)(&dummy), TRUE);
1910# ifdef HEURISTIC2_LIMIT
1911 if (result > HEURISTIC2_LIMIT
1912 && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
1913 result = HEURISTIC2_LIMIT;
1914 }
1915# endif
1916# else
1917 result = GC_find_limit((ptr_t)(&dummy), FALSE);
1918# ifdef HEURISTIC2_LIMIT
1919 if (result < HEURISTIC2_LIMIT
1920 && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
1921 result = HEURISTIC2_LIMIT;
1922 }
1923# endif
1924# endif
1925
1926# endif /* HEURISTIC2 */
91b17416 1927# if STACK_GROWS_DOWN
155415a5
MV		 1928 if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
1929# endif
1930 return(result);
1931# endif /* STACKBOTTOM */
9500b5b9 1932}
155415a5
MV		 1933
1934# endif /* ! AMIGA */
1935# endif /* ! OS2 */
1936# endif /* ! MSWIN32 */
8cbb63c7 1937
fbff94c9 1938#endif /* mach_type_known */
8cbb63c7 1939#endif /* ! HAVE_LIBC_STACK_END */
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