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* convert.c: include <string.h> for convert_i.c.
[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.
58ade102 6 * Copyright (c) 2000, 2001 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
155415a5
MV		 24#include <ctype.h>
25#include "libguile/gc.h"
26
27#define ABORT(msg) abort ()
28
29typedef char * ptr_t; /* A generic pointer to which we can add */
30 /* byte displacements. */
31 /* Preferably identical to caddr_t, if it */
32 /* exists. */
33
34/* Define word and signed_word to be unsigned and signed types of the */
35/* size as char * or void *. There seems to be no way to do this */
36/* even semi-portably. The following is probably no better/worse */
37/* than almost anything else. */
38/* The ANSI standard suggests that size_t and ptr_diff_t might be */
39/* better choices. But those appear to have incorrect definitions */
40/* on may systems. Notably "typedef int size_t" seems to be both */
41/* frequent and WRONG. */
42typedef unsigned long GC_word;
43typedef long GC_signed_word;
44
45typedef GC_word word;
46typedef GC_signed_word signed_word;
47
a3487916
MV		 48typedef int GC_bool;
49# define TRUE 1
50# define FALSE 0
51
52#if defined(__STDC__)
53# include <stdlib.h>
54# if !(defined( sony_news ) )
55# include <stddef.h>
56# endif
57# define VOLATILE volatile
58#else
59# ifdef MSWIN32
60# include <stdlib.h>
61# endif
62# define VOLATILE
63#endif
64
155415a5
MV		 65/* Machine dependent parameters. Some tuning parameters can be found */
66/* near the top of gc_private.h. */
67
68/* Machine specific parts contributed by various people. See README file. */
69
70/* First a unified test for Linux: */
71# if defined(linux) || defined(__linux__)
72# define LINUX
73# endif
74
75/* Determine the machine type: */
76# if defined(sun) && defined(mc68000)
77# define M68K
78# define SUNOS4
79# define mach_type_known
80# endif
81# if defined(hp9000s300)
82# define M68K
83# define HP
84# define mach_type_known
85# endif
86# if defined(__OpenBSD__) && defined(m68k)
87# define M68K
88# define OPENBSD
89# define mach_type_known
90# endif
91# if defined(__OpenBSD__) && defined(__sparc__)
92# define SPARC
93# define OPENBSD
94# define mach_type_known
95# endif
96# if defined(__NetBSD__) && defined(m68k)
97# define M68K
98# define NETBSD
99# define mach_type_known
100# endif
101# if defined(__NetBSD__) && defined(arm32)
102# define ARM32
103# define NETBSD
104# define mach_type_known
105# endif
106# if defined(vax)
107# define VAX
108# ifdef ultrix
109# define ULTRIX
110# else
111# define BSD
112# endif
113# define mach_type_known
114# endif
115# if defined(mips) || defined(__mips)
116# define MIPS
117# if !defined(LINUX)
118# if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)
119# define ULTRIX
120# else
121# if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \
122 || defined(__SYSTYPE_SVR4__)
123# define IRIX5 /* or IRIX 6.X */
124# else
125# define RISCOS /* or IRIX 4.X */
126# endif
127# endif
128# endif /* !LINUX */
129# define mach_type_known
130# endif
131# if defined(sequent) && defined(i386)
132# define I386
133# define SEQUENT
134# define mach_type_known
135# endif
136# if defined(sun) && defined(i386)
137# define I386
138# define SUNOS5
139# define mach_type_known
140# endif
141# if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
142# define I386
143# define OS2
144# define mach_type_known
145# endif
146# if defined(ibm032)
147# define RT
148# define mach_type_known
149# endif
150# if defined(sun) && (defined(sparc) || defined(__sparc))
151# define SPARC
152 /* Test for SunOS 5.x */
153# include <errno.h>
154# ifdef ECHRNG
155# define SUNOS5
156# else
157# define SUNOS4
158# endif
159# define mach_type_known
160# endif
161# if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
162 && !defined(__OpenBSD__)
163# define SPARC
164# define DRSNX
165# define mach_type_known
166# endif
167# if defined(_IBMR2)
168# define RS6000
169# define mach_type_known
170# endif
171# if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
172 /* The above test may need refinement */
173# define I386
174# if defined(_SCO_ELF)
175# define SCO_ELF
176# else
177# define SCO
178# endif
179# define mach_type_known
180# endif
181# if defined(_AUX_SOURCE)
182# define M68K
183# define SYSV
184# define mach_type_known
185# endif
186# if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
187 || defined(hppa) || defined(__hppa__)
188# define HP_PA
189# ifndef LINUX
190# define HPUX
191# endif
192# define mach_type_known
193# endif
194# if defined(LINUX) && (defined(i386) || defined(__i386__))
195# define I386
196# define mach_type_known
197# endif
198# if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
199# define IA64
200# define mach_type_known
201# endif
202# if defined(LINUX) && defined(powerpc)
203# define POWERPC
204# define mach_type_known
205# endif
206# if defined(LINUX) && defined(__mc68000__)
207# define M68K
208# define mach_type_known
209# endif
210# if defined(LINUX) && (defined(sparc) || defined(__sparc__))
211# define SPARC
212# define mach_type_known
213# endif
214# if defined(LINUX) && defined(arm)
215# define ARM32
216# define mach_type_known
217# endif
218# if defined(__alpha) || defined(__alpha__)
219# define ALPHA
220# if !defined(LINUX)
221# define OSF1 /* a.k.a Digital Unix */
222# endif
223# define mach_type_known
224# endif
225# if defined(_AMIGA) && !defined(AMIGA)
226# define AMIGA
227# endif
9ec1e770 228# ifdef AMIGA
155415a5
MV		 229# define M68K
230# define mach_type_known
231# endif
232# if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
233# define M68K
234# define MACOS
235# define mach_type_known
236# endif
237# if defined(__MWERKS__) && defined(__powerc)
238# define POWERPC
239# define MACOS
240# define mach_type_known
241# endif
242# if defined(macosx)
243# define MACOSX
244# define POWERPC
245# define mach_type_known
246# endif
247# if defined(NeXT) && defined(mc68000)
248# define M68K
249# define NEXT
250# define mach_type_known
251# endif
252# if defined(NeXT) && defined(i386)
253# define I386
254# define NEXT
255# define mach_type_known
256# endif
257# if defined(__OpenBSD__) && defined(i386)
258# define I386
259# define OPENBSD
260# define mach_type_known
261# endif
262# if defined(__FreeBSD__) && defined(i386)
263# define I386
264# define FREEBSD
265# define mach_type_known
266# endif
267# if defined(__NetBSD__) && defined(i386)
268# define I386
269# define NETBSD
270# define mach_type_known
271# endif
272# if defined(bsdi) && defined(i386)
273# define I386
274# define BSDI
275# define mach_type_known
276# endif
277# if !defined(mach_type_known) && defined(__386BSD__)
278# define I386
279# define THREE86BSD
280# define mach_type_known
281# endif
282# if defined(_CX_UX) && defined(_M88K)
283# define M88K
284# define CX_UX
285# define mach_type_known
286# endif
287# if defined(DGUX)
288# define M88K
289 /* DGUX defined */
290# define mach_type_known
291# endif
292# if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
293 || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
294# define I386
295# define MSWIN32 /* or Win32s */
296# define mach_type_known
297# endif
298# if defined(__DJGPP__)
299# define I386
300# ifndef DJGPP
301# define DJGPP /* MSDOS running the DJGPP port of GCC */
302# endif
303# define mach_type_known
304# endif
305# if defined(__CYGWIN32__) || defined(__CYGWIN__)
306# define I386
307# define CYGWIN32
308# define mach_type_known
309# endif
310# if defined(__MINGW32__)
311# define I386
312# define MSWIN32
313# define mach_type_known
314# endif
315# if defined(__BORLANDC__)
316# define I386
317# define MSWIN32
318# define mach_type_known
319# endif
320# if defined(_UTS) && !defined(mach_type_known)
321# define S370
322# define UTS4
323# define mach_type_known
324# endif
325# if defined(__pj__)
326# define PJ
327# define mach_type_known
328# endif
329/* Ivan Demakov */
330# if defined(__WATCOMC__) && defined(__386__)
331# define I386
332# if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
333# if defined(__OS2__)
334# define OS2
335# else
336# if defined(__WINDOWS_386__) || defined(__NT__)
337# define MSWIN32
338# else
339# define DOS4GW
340# endif
341# endif
342# endif
343# define mach_type_known
344# endif
345
346/* Feel free to add more clauses here */
347
348/* Or manually define the machine type here. A machine type is */
349/* characterized by the architecture. Some */
350/* machine types are further subdivided by OS. */
351/* the macros ULTRIX, RISCOS, and BSD to distinguish. */
352/* Note that SGI IRIX is treated identically to RISCOS. */
353/* SYSV on an M68K actually means A/UX. */
354/* The distinction in these cases is usually the stack starting address */
355# ifndef mach_type_known
356 --> unknown machine type
357# endif
358 /* Mapping is: M68K ==> Motorola 680X0 */
359 /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
360 /* MACOS and AMIGA variants) */
361 /* I386 ==> Intel 386 */
362 /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
363 /* FREEBSD, THREE86BSD, MSWIN32, */
364 /* BSDI,SUNOS5, NEXT, other variants) */
365 /* NS32K ==> Encore Multimax */
366 /* MIPS ==> R2000 or R3000 */
367 /* (RISCOS, ULTRIX variants) */
368 /* VAX ==> DEC VAX */
369 /* (BSD, ULTRIX variants) */
370 /* RS6000 ==> IBM RS/6000 AIX3.X */
371 /* RT ==> IBM PC/RT */
372 /* HP_PA ==> HP9000/700 & /800 */
373 /* HP/UX */
374 /* SPARC ==> SPARC under SunOS */
375 /* (SUNOS4, SUNOS5, */
376 /* DRSNX variants) */
377 /* ALPHA ==> DEC Alpha */
378 /* (OSF1 and LINUX variants) */
379 /* M88K ==> Motorola 88XX0 */
380 /* (CX_UX and DGUX) */
381 /* S370 ==> 370-like machine */
382 /* running Amdahl UTS4 */
383 /* ARM32 ==> Intel StrongARM */
384 /* IA64 ==> Intel IA64 */
385 /* (e.g. Itanium) */
386
387
388/*
389 * For each architecture and OS, the following need to be defined:
390 *
391 * CPP_WORD_SZ is a simple integer constant representing the word size.
392 * in bits. We assume byte addressibility, where a byte has 8 bits.
393 * We also assume CPP_WORD_SZ is either 32 or 64.
394 * (We care about the length of pointers, not hardware
395 * bus widths. Thus a 64 bit processor with a C compiler that uses
396 * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
397 *
398 * MACH_TYPE is a string representation of the machine type.
399 * OS_TYPE is analogous for the OS.
400 *
401 * ALIGNMENT is the largest N, such that
402 * all pointer are guaranteed to be aligned on N byte boundaries.
403 * defining it to be 1 will always work, but perform poorly.
404 *
405 * DATASTART is the beginning of the data segment.
406 * On UNIX systems, the collector will scan the area between DATASTART
407 * and DATAEND for root pointers.
408 *
409 * DATAEND, if not &end.
410 *
411 * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
412 * the pointer size.
413 *
414 * STACKBOTTOM is the cool end of the stack, which is usually the
415 * highest address in the stack.
416 * Under PCR or OS/2, we have other ways of finding thread stacks.
417 * For each machine, the following should:
418 * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
419 * 2) define exactly one of
420 * STACKBOTTOM (should be defined to be an expression)
421 * HEURISTIC1
422 * HEURISTIC2
423 * If either of the last two macros are defined, then STACKBOTTOM is computed
424 * during collector startup using one of the following two heuristics:
425 * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
426 * the next multiple of STACK_GRAN.
427 * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
428 * in small steps (decrement if STACK_GROWS_UP), and read the value
429 * at each location. Remember the value when the first
430 * Segmentation violation or Bus error is signalled. Round that
431 * to the nearest plausible page boundary, and use that instead
432 * of STACKBOTTOM.
433 *
434 * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
435 * the value of environ is a pointer that can serve as STACKBOTTOM.
436 * I expect that HEURISTIC2 can be replaced by this approach, which
9ec1e770 437 * interferes far less with debugging.
155415a5
MV		 438 *
439 * If no expression for STACKBOTTOM can be found, and neither of the above
440 * heuristics are usable, the collector can still be used with all of the above
441 * undefined, provided one of the following is done:
442 * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
443 * without reference to STACKBOTTOM. This is appropriate for use in
444 * conjunction with thread packages, since there will be multiple stacks.
445 * (Allocating thread stacks in the heap, and treating them as ordinary
446 * heap data objects is also possible as a last resort. However, this is
447 * likely to introduce significant amounts of excess storage retention
448 * unless the dead parts of the thread stacks are periodically cleared.)
449 * 2) Client code may set GC_stackbottom before calling any GC_ routines.
450 * If the author of the client code controls the main program, this is
451 * easily accomplished by introducing a new main program, setting
452 * GC_stackbottom to the address of a local variable, and then calling
453 * the original main program. The new main program would read something
454 * like:
455 *
456 * # include "gc_private.h"
457 *
458 * main(argc, argv, envp)
459 * int argc;
460 * char **argv, **envp;
461 * {
462 * int dummy;
463 *
464 * GC_stackbottom = (ptr_t)(&dummy);
465 * return(real_main(argc, argv, envp));
466 * }
467 *
468 *
469 * Each architecture may also define the style of virtual dirty bit
470 * implementation to be used:
471 * MPROTECT_VDB: Write protect the heap and catch faults.
472 * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
473 *
474 * An architecture may define DYNAMIC_LOADING if dynamic_load.c
475 * defined GC_register_dynamic_libraries() for the architecture.
476 *
477 * An architecture may define PREFETCH(x) to preload the cache with *x.
478 * This defaults to a no-op.
479 *
480 * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
481 *
482 * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
483 * clear the two words at GC_malloc-aligned address x. By default,
484 * word stores of 0 are used instead.
485 */
486
487
488# define STACK_GRAN 0x1000000
489# ifdef M68K
490# define MACH_TYPE "M68K"
491# define ALIGNMENT 2
492# ifdef OPENBSD
493# define OS_TYPE "OPENBSD"
494# define HEURISTIC2
495 extern char etext;
496# define DATASTART ((ptr_t)(&etext))
497# endif
498# ifdef NETBSD
499# define OS_TYPE "NETBSD"
500# define HEURISTIC2
501 extern char etext;
502# define DATASTART ((ptr_t)(&etext))
503# endif
504# ifdef LINUX
505# define OS_TYPE "LINUX"
506# define STACKBOTTOM ((ptr_t)0xf0000000)
507# define MPROTECT_VDB
508# ifdef __ELF__
509# define DYNAMIC_LOADING
510 extern char **__environ;
511# define DATASTART ((ptr_t)(&__environ))
512 /* hideous kludge: __environ is the first */
513 /* word in crt0.o, and delimits the start */
514 /* of the data segment, no matter which */
515 /* ld options were passed through. */
516 /* We could use _etext instead, but that */
517 /* would include .rodata, which may */
518 /* contain large read-only data tables */
519 /* that we'd rather not scan. */
520 extern int _end;
521# define DATAEND (&_end)
522# else
523 extern int etext;
524# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
525# endif
526# endif
527# ifdef SUNOS4
528# define OS_TYPE "SUNOS4"
529 extern char etext;
530# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
531# define HEURISTIC1 /* differs */
532# define DYNAMIC_LOADING
533# endif
534# ifdef HP
535# define OS_TYPE "HP"
536 extern char etext;
537# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
538# define STACKBOTTOM ((ptr_t) 0xffeffffc)
539 /* empirically determined. seems to work. */
540# include <unistd.h>
541# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
542# endif
543# ifdef SYSV
544# define OS_TYPE "SYSV"
545 extern etext;
546# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
547 & ~0x3fffff) \
548 +((word)&etext & 0x1fff))
549 /* This only works for shared-text binaries with magic number 0413.
550 The other sorts of SysV binaries put the data at the end of the text,
551 in which case the default of &etext would work. Unfortunately,
552 handling both would require having the magic-number available.
553 -- Parag
554 */
555# define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
556 /* The stack starts at the top of memory, but */
557 /* 0x0 cannot be used as setjump_test complains */
558 /* that the stack direction is incorrect. Two */
559 /* bytes down from 0x0 should be safe enough. */
560 /* --Parag */
561# include <sys/mmu.h>
562# define GETPAGESIZE() PAGESIZE /* Is this still right? */
563# endif
564# ifdef AMIGA
565# define OS_TYPE "AMIGA"
566 /* STACKBOTTOM and DATASTART handled specially */
567 /* in os_dep.c */
568# define DATAEND /* not needed */
569# define GETPAGESIZE() 4096
570# endif
571# ifdef MACOS
572# ifndef __LOWMEM__
573# include <LowMem.h>
574# endif
575# define OS_TYPE "MACOS"
576 /* see os_dep.c for details of global data segments. */
577# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
578# define DATAEND /* not needed */
579# define GETPAGESIZE() 4096
580# endif
581# ifdef NEXT
582# define OS_TYPE "NEXT"
583# define DATASTART ((ptr_t) get_etext())
584# define STACKBOTTOM ((ptr_t) 0x4000000)
585# define DATAEND /* not needed */
586# endif
587# endif
588
589# ifdef POWERPC
590# define MACH_TYPE "POWERPC"
591# ifdef MACOS
592# define ALIGNMENT 2 /* Still necessary? Could it be 4? */
593# ifndef __LOWMEM__
594# include <LowMem.h>
595# endif
596# define OS_TYPE "MACOS"
597 /* see os_dep.c for details of global data segments. */
598# define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
599# define DATAEND /* not needed */
600# endif
601# ifdef LINUX
602# define ALIGNMENT 4 /* Guess. Can someone verify? */
603 /* This was 2, but that didn't sound right. */
604# define OS_TYPE "LINUX"
605# define HEURISTIC1
606# define DYNAMIC_LOADING
607# undef STACK_GRAN
608# define STACK_GRAN 0x10000000
609 /* Stack usually starts at 0x80000000 */
610# define LINUX_DATA_START
611 extern int _end;
612# define DATAEND (&_end)
613# endif
614# ifdef MACOSX
615# define ALIGNMENT 4
616# define OS_TYPE "MACOSX"
617# define DATASTART ((ptr_t) get_etext())
618# define STACKBOTTOM ((ptr_t) 0xc0000000)
619# define DATAEND /* not needed */
620# endif
621# endif
622
623# ifdef VAX
624# define MACH_TYPE "VAX"
625# define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
626 extern char etext;
627# define DATASTART ((ptr_t)(&etext))
628# ifdef BSD
629# define OS_TYPE "BSD"
630# define HEURISTIC1
631 /* HEURISTIC2 may be OK, but it's hard to test. */
632# endif
633# ifdef ULTRIX
634# define OS_TYPE "ULTRIX"
635# define STACKBOTTOM ((ptr_t) 0x7fffc800)
636# endif
637# endif
638
639# ifdef RT
640# define MACH_TYPE "RT"
641# define ALIGNMENT 4
642# define DATASTART ((ptr_t) 0x10000000)
643# define STACKBOTTOM ((ptr_t) 0x1fffd800)
644# endif
645
646# ifdef SPARC
647# define MACH_TYPE "SPARC"
648# define ALIGNMENT 4 /* Required by hardware */
649# define ALIGN_DOUBLE
650 extern int etext;
651# ifdef SUNOS5
652# define OS_TYPE "SUNOS5"
653 extern int _etext;
654 extern int _end;
655 extern char * GC_SysVGetDataStart();
656# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
657# define DATAEND (&_end)
658# ifndef USE_MMAP
659# define USE_MMAP
660# endif
661# ifdef USE_MMAP
662# define HEAP_START (ptr_t)0x40000000
663# else
664# define HEAP_START DATAEND
665# endif
666# define PROC_VDB
667/* HEURISTIC1 reportedly no longer works under 2.7. Thus we */
668/* switched to HEURISTIC2, eventhough it creates some debugging */
669/* issues. */
670# define HEURISTIC2
671# include <unistd.h>
672# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
673 /* getpagesize() appeared to be missing from at least one */
674 /* Solaris 5.4 installation. Weird. */
675# define DYNAMIC_LOADING
676# endif
677# ifdef SUNOS4
678# define OS_TYPE "SUNOS4"
679 /* [If you have a weak stomach, don't read this.] */
680 /* We would like to use: */
681/* # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
682 /* This fails occasionally, due to an ancient, but very */
683 /* persistent ld bug. &etext is set 32 bytes too high. */
684 /* We instead read the text segment size from the a.out */
685 /* header, which happens to be mapped into our address space */
686 /* at the start of the text segment. The detective work here */
687 /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
688 /* Serpette of INRIA. */
689 /* This assumes ZMAGIC, i.e. demand-loadable executables. */
690# define TEXTSTART 0x2000
691# define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
692# define MPROTECT_VDB
693# define HEURISTIC1
694# define DYNAMIC_LOADING
695# endif
696# ifdef DRSNX
697# define CPP_WORDSZ 32
698# define OS_TYPE "DRSNX"
699 extern char * GC_SysVGetDataStart();
700 extern int etext;
701# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
702# define MPROTECT_VDB
703# define STACKBOTTOM ((ptr_t) 0xdfff0000)
704# define DYNAMIC_LOADING
705# endif
706# ifdef LINUX
707# define OS_TYPE "LINUX"
708# ifdef __ELF__
709# define LINUX_DATA_START
710# define DYNAMIC_LOADING
711# else
712 Linux Sparc non elf ?
713# endif
714 extern int _end;
715# define DATAEND (&_end)
716# define SVR4
717# define STACKBOTTOM ((ptr_t) 0xf0000000)
718# endif
719# ifdef OPENBSD
720# define OS_TYPE "OPENBSD"
721# define STACKBOTTOM ((ptr_t) 0xf8000000)
722# define DATASTART ((ptr_t)(&etext))
723# endif
724# endif
725
726# ifdef I386
727# define MACH_TYPE "I386"
728# define ALIGNMENT 4 /* Appears to hold for all "32 bit" compilers */
729 /* except Borland. The -a4 option fixes */
730 /* Borland. */
731 /* Ivan Demakov: For Watcom the option is -zp4. */
732# ifndef SMALL_CONFIG
733# define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
734 /* improvement on Pentiums. */
735# endif
736# ifdef SEQUENT
737# define OS_TYPE "SEQUENT"
738 extern int etext;
739# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
9ec1e770 740# define STACKBOTTOM ((ptr_t) 0x3ffff000)
155415a5
MV		 741# endif
742# ifdef SUNOS5
743# define OS_TYPE "SUNOS5"
744 extern int etext, _start;
745 extern char * GC_SysVGetDataStart();
746# define DATASTART GC_SysVGetDataStart(0x1000, &etext)
747# define STACKBOTTOM ((ptr_t)(&_start))
748/** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
749/*# define PROC_VDB*/
750# define DYNAMIC_LOADING
751# ifndef USE_MMAP
752# define USE_MMAP
753# endif
754# ifdef USE_MMAP
755# define HEAP_START (ptr_t)0x40000000
756# else
757# define HEAP_START DATAEND
758# endif
759# endif
760# ifdef SCO
761# define OS_TYPE "SCO"
762 extern int etext;
763# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
764 & ~0x3fffff) \
765 +((word)&etext & 0xfff))
766# define STACKBOTTOM ((ptr_t) 0x7ffffffc)
767# endif
768# ifdef SCO_ELF
769# define OS_TYPE "SCO_ELF"
770 extern int etext;
771# define DATASTART ((ptr_t)(&etext))
772# define STACKBOTTOM ((ptr_t) 0x08048000)
773# define DYNAMIC_LOADING
774# define ELF_CLASS ELFCLASS32
775# endif
776# ifdef LINUX
777# define OS_TYPE "LINUX"
778# define LINUX_STACKBOTTOM
779# if 0
780# define HEURISTIC1
781# undef STACK_GRAN
782# define STACK_GRAN 0x10000000
783 /* STACKBOTTOM is usually 0xc0000000, but this changes with */
784 /* different kernel configurations. In particular, systems */
785 /* with 2GB physical memory will usually move the user */
786 /* address space limit, and hence initial SP to 0x80000000. */
787# endif
788# if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
789# define MPROTECT_VDB
790# else
791 /* We seem to get random errors in incremental mode, */
792 /* possibly because Linux threads is itself a malloc client */
793 /* and can't deal with the signals. */
794# endif
795# ifdef __ELF__
796# define DYNAMIC_LOADING
797# ifdef UNDEFINED /* includes ro data */
798 extern int _etext;
799# define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
800# endif
801# include <features.h>
802# if defined(__GLIBC__) && __GLIBC__ >= 2
803# define LINUX_DATA_START
804# else
805 extern char **__environ;
806# define DATASTART ((ptr_t)(&__environ))
807 /* hideous kludge: __environ is the first */
808 /* word in crt0.o, and delimits the start */
809 /* of the data segment, no matter which */
810 /* ld options were passed through. */
811 /* We could use _etext instead, but that */
812 /* would include .rodata, which may */
813 /* contain large read-only data tables */
814 /* that we'd rather not scan. */
815# endif
816 extern int _end;
817# define DATAEND (&_end)
818# else
819 extern int etext;
820# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
821# endif
822# ifdef USE_I686_PREFETCH
823# define PREFETCH(x) \
824 __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))
825 /* Empirically prefetcht0 is much more effective at reducing */
826 /* cache miss stalls for the targetted load instructions. But it */
827 /* seems to interfere enough with other cache traffic that the net */
828 /* result is worse than prefetchnta. */
9ec1e770 829# if 0
155415a5
MV		 830 /* Using prefetches for write seems to have a slight negative */
831 /* impact on performance, at least for a PIII/500. */
832# define PREFETCH_FOR_WRITE(x) \
833 __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))
834# endif
835# endif
836# ifdef USE_3DNOW_PREFETCH
837# define PREFETCH(x) \
838 __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))
9ec1e770 839# define PREFETCH_FOR_WRITE(x)
155415a5
MV		 840 __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))
841# endif
842# endif
843# ifdef CYGWIN32
844# define OS_TYPE "CYGWIN32"
845 extern int _data_start__;
846 extern int _data_end__;
847 extern int _bss_start__;
848 extern int _bss_end__;
849 /* For binutils 2.9.1, we have */
850 /* DATASTART = _data_start__ */
851 /* DATAEND = _bss_end__ */
852 /* whereas for some earlier versions it was */
853 /* DATASTART = _bss_start__ */
854 /* DATAEND = _data_end__ */
855 /* To get it right for both, we take the */
856 /* minumum/maximum of the two. */
857# define MAX(x,y) ((x) > (y) ? (x) : (y))
858# define MIN(x,y) ((x) < (y) ? (x) : (y))
859# define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
860# define DATAEND ((ptr_t) MAX(&_data_end__, &_bss_end__))
861# undef STACK_GRAN
862# define STACK_GRAN 0x10000
863# define HEURISTIC1
864# endif
865# ifdef OS2
866# define OS_TYPE "OS2"
867 /* STACKBOTTOM and DATASTART are handled specially in */
868 /* os_dep.c. OS2 actually has the right */
869 /* system call! */
870# define DATAEND /* not needed */
871# endif
872# ifdef MSWIN32
873# define OS_TYPE "MSWIN32"
874 /* STACKBOTTOM and DATASTART are handled specially in */
875 /* os_dep.c. */
876# ifndef __WATCOMC__
877# define MPROTECT_VDB
878# endif
879# define DATAEND /* not needed */
880# endif
881# ifdef DJGPP
882# define OS_TYPE "DJGPP"
883# include "stubinfo.h"
884 extern int etext;
885 extern int _stklen;
886 extern int __djgpp_stack_limit;
887# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
888/* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
889 + _stklen)) */
890# define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
891 /* This may not be right. */
892# endif
893# ifdef OPENBSD
894# define OS_TYPE "OPENBSD"
895# endif
896# ifdef FREEBSD
897# define OS_TYPE "FREEBSD"
898# define MPROTECT_VDB
899# endif
900# ifdef NETBSD
901# define OS_TYPE "NETBSD"
902# endif
903# ifdef THREE86BSD
904# define OS_TYPE "THREE86BSD"
905# endif
906# ifdef BSDI
907# define OS_TYPE "BSDI"
908# endif
909# if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
910 || defined(THREE86BSD) || defined(BSDI)
911# define HEURISTIC2
912 extern char etext;
913# define DATASTART ((ptr_t)(&etext))
914# endif
915# ifdef NEXT
916# define OS_TYPE "NEXT"
917# define DATASTART ((ptr_t) get_etext())
918# define STACKBOTTOM ((ptr_t)0xc0000000)
919# define DATAEND /* not needed */
920# endif
921# ifdef DOS4GW
922# define OS_TYPE "DOS4GW"
923 extern long __nullarea;
924 extern char _end;
925 extern char *_STACKTOP;
926 /* Depending on calling conventions Watcom C either precedes
927 or does not precedes with undescore names of C-variables.
928 Make sure startup code variables always have the same names. */
929 #pragma aux __nullarea "*";
930 #pragma aux _end "*";
931# define STACKBOTTOM ((ptr_t) _STACKTOP)
932 /* confused? me too. */
933# define DATASTART ((ptr_t) &__nullarea)
934# define DATAEND ((ptr_t) &_end)
935# endif
936# endif
937
938# ifdef NS32K
939# define MACH_TYPE "NS32K"
940# define ALIGNMENT 4
941 extern char **environ;
942# define DATASTART ((ptr_t)(&environ))
943 /* hideous kludge: environ is the first */
944 /* word in crt0.o, and delimits the start */
945 /* of the data segment, no matter which */
946 /* ld options were passed through. */
947# define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
948# endif
949
950# ifdef MIPS
951# define MACH_TYPE "MIPS"
952/* # define STACKBOTTOM ((ptr_t)0x7fff8000) sometimes also works. */
953# ifdef LINUX
954 /* This was developed for a linuxce style platform. Probably */
955 /* needs to be tweaked for workstation class machines. */
956# define OS_TYPE "LINUX"
957 extern int __data_start;
958# define DATASTART ((ptr_t)(&__data_start))
959# define ALIGNMENT 4
960# define USE_GENERIC_PUSH_REGS 1
961# define STACKBOTTOM 0x80000000
962 /* In many cases, this should probably use LINUX_STACKBOTTOM */
963 /* instead. But some kernel versions seem to give the wrong */
964 /* value from /proc. */
965# endif /* Linux */
966# ifdef ULTRIX
967# define HEURISTIC2
968# define DATASTART (ptr_t)0x10000000
969 /* Could probably be slightly higher since */
970 /* startup code allocates lots of stuff. */
971# define OS_TYPE "ULTRIX"
972# define ALIGNMENT 4
973# endif
974# ifdef RISCOS
975# define HEURISTIC2
976# define DATASTART (ptr_t)0x10000000
977# define OS_TYPE "RISCOS"
978# define ALIGNMENT 4 /* Required by hardware */
979# endif
980# ifdef IRIX5
981# define HEURISTIC2
982 extern int _fdata;
983# define DATASTART ((ptr_t)(&_fdata))
984# ifdef USE_MMAP
985# define HEAP_START (ptr_t)0x30000000
986# else
987# define HEAP_START DATASTART
988# endif
989 /* Lowest plausible heap address. */
990 /* In the MMAP case, we map there. */
991 /* In either case it is used to identify */
992 /* heap sections so they're not */
993 /* considered as roots. */
994# define OS_TYPE "IRIX5"
995# define MPROTECT_VDB
996# ifdef _MIPS_SZPTR
997# define CPP_WORDSZ _MIPS_SZPTR
998# define ALIGNMENT (_MIPS_SZPTR/8)
999# if CPP_WORDSZ != 64
1000# define ALIGN_DOUBLE
1001# endif
1002# else
1003# define ALIGNMENT 4
1004# define ALIGN_DOUBLE
1005# endif
1006# define DYNAMIC_LOADING
1007# endif
1008# endif
1009
1010# ifdef RS6000
1011# define MACH_TYPE "RS6000"
1012# define ALIGNMENT 4
1013# define DATASTART ((ptr_t)0x20000000)
1014 extern int errno;
1015# define STACKBOTTOM ((ptr_t)((ulong)&errno))
1016# define DYNAMIC_LOADING
1017 /* For really old versions of AIX, this may have to be removed. */
1018# endif
1019
1020# ifdef HP_PA
1021 /* OS is assumed to be HP/UX */
1022# define MACH_TYPE "HP_PA"
1023# define OS_TYPE "HPUX"
1024# ifdef __LP64__
1025# define CPP_WORDSZ 64
1026# define ALIGNMENT 8
1027# else
1028# define CPP_WORDSZ 32
1029# define ALIGNMENT 4
1030# define ALIGN_DOUBLE
1031# endif
1032 extern int __data_start;
1033# define DATASTART ((ptr_t)(&__data_start))
1034# if 0
1035 /* The following appears to work for 7xx systems running HP/UX */
1036 /* 9.xx Furthermore, it might result in much faster */
1037 /* collections than HEURISTIC2, which may involve scanning */
1038 /* segments that directly precede the stack. It is not the */
1039 /* default, since it may not work on older machine/OS */
1040 /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1041 /* this.) */
1042# define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1043# else
1044 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1045 /* to this. We'll probably do this on other platforms, too. */
1046 /* For now I'll use it where I can test it. */
1047 extern char ** environ;
1048# define STACKBOTTOM ((ptr_t)environ)
1049# endif
1050# define STACK_GROWS_UP
1051# define DYNAMIC_LOADING
1052# ifndef HPUX_THREADS
1053# define MPROTECT_VDB
1054# endif
1055# include <unistd.h>
1056# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1057# endif
1058
1059# ifdef ALPHA
1060# define MACH_TYPE "ALPHA"
1061# define ALIGNMENT 8
1062# define USE_GENERIC_PUSH_REGS
1063 /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1064 /* fp registers in some cases when the target is a 21264. The assembly */
1065 /* code doesn't handle that yet, and version dependencies make that a */
1066 /* bit tricky. Do the easy thing for now. */
1067# ifdef OSF1
1068# define OS_TYPE "OSF1"
1069# define DATASTART ((ptr_t) 0x140000000)
1070 extern _end;
1071# define DATAEND ((ptr_t) &_end)
1072# define HEURISTIC2
1073 /* Normally HEURISTIC2 is too conervative, since */
1074 /* the text segment immediately follows the stack. */
1075 /* Hence we give an upper pound. */
1076 extern int __start;
1077# define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
1078# define CPP_WORDSZ 64
1079# define MPROTECT_VDB
1080# define DYNAMIC_LOADING
1081# endif
1082# ifdef LINUX
1083# define OS_TYPE "LINUX"
1084# define CPP_WORDSZ 64
1085# define STACKBOTTOM ((ptr_t) 0x120000000)
1086# ifdef __ELF__
1087# define LINUX_DATA_START
1088# define DYNAMIC_LOADING
1089 /* This doesn't work if the collector is in a dynamic library. */
1090# else
1091# define DATASTART ((ptr_t) 0x140000000)
1092# endif
1093 extern int _end;
1094# define DATAEND (&_end)
1095# define MPROTECT_VDB
1096 /* Has only been superficially tested. May not */
1097 /* work on all versions. */
1098# endif
1099# endif
1100
1101# ifdef IA64
1102# define MACH_TYPE "IA64"
1103# define ALIGN_DOUBLE
1104 /* Requires 16 byte alignment for malloc */
1105# define ALIGNMENT 8
1106# define USE_GENERIC_PUSH_REGS
1107 /* We need to get preserved registers in addition to register windows. */
1108 /* That's easiest to do with setjmp. */
1109# ifdef HPUX
1110 --> needs work
1111# endif
1112# ifdef LINUX
1113# define OS_TYPE "LINUX"
1114# define CPP_WORDSZ 64
1115 /* This should really be done through /proc, but that */
1116 /* requires we run on an IA64 kernel. */
1117# define STACKBOTTOM ((ptr_t) 0xa000000000000000l)
1118 /* We also need the base address of the register stack */
1119 /* backing store. There is probably a better way to */
1120 /* get that, too ... */
1121# define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l)
1122# if 1
1123# define SEARCH_FOR_DATA_START
1124# define DATASTART GC_data_start
1125# else
1126 extern int data_start;
1127# define DATASTART ((ptr_t)(&data_start))
1128# endif
1129# define DYNAMIC_LOADING
1130# define MPROTECT_VDB
1131 /* Requires Linux 2.3.47 or later. */
1132 extern int _end;
1133# define DATAEND (&_end)
1134# define PREFETCH(x) \
1135 __asm__ (" lfetch [%0]": : "r"((void *)(x)))
1136# define PREFETCH_FOR_WRITE(x) \
1137 __asm__ (" lfetch.excl [%0]": : "r"((void *)(x)))
1138# define CLEAR_DOUBLE(x) \
1139 __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1140# endif
1141# endif
1142
1143# ifdef M88K
1144# define MACH_TYPE "M88K"
1145# define ALIGNMENT 4
1146# define ALIGN_DOUBLE
1147 extern int etext;
1148# ifdef CX_UX
1149# define OS_TYPE "CX_UX"
1150# define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1151# endif
1152# ifdef DGUX
1153# define OS_TYPE "DGUX"
1154 extern char * GC_SysVGetDataStart();
1155# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
1156# endif
1157# define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1158# endif
1159
1160# ifdef S370
1161# define MACH_TYPE "S370"
1162# define OS_TYPE "UTS4"
1163# define ALIGNMENT 4 /* Required by hardware */
1164 extern int etext;
1165 extern int _etext;
1166 extern int _end;
1167 extern char * GC_SysVGetDataStart();
1168# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
1169# define DATAEND (&_end)
1170# define HEURISTIC2
1171# endif
1172
1173# if defined(PJ)
1174# define ALIGNMENT 4
1175 extern int _etext;
1176# define DATASTART ((ptr_t)(&_etext))
1177# define HEURISTIC1
1178# endif
1179
1180# ifdef ARM32
1181# define CPP_WORDSZ 32
1182# define MACH_TYPE "ARM32"
1183# define ALIGNMENT 4
1184# ifdef NETBSD
1185# define OS_TYPE "NETBSD"
1186# define HEURISTIC2
1187 extern char etext;
1188# define DATASTART ((ptr_t)(&etext))
1189# define USE_GENERIC_PUSH_REGS
1190# endif
1191# ifdef LINUX
1192# define OS_TYPE "LINUX"
1193# define HEURISTIC1
1194# undef STACK_GRAN
1195# define STACK_GRAN 0x10000000
1196# define USE_GENERIC_PUSH_REGS
1197# ifdef __ELF__
1198# define DYNAMIC_LOADING
1199# include <features.h>
1200# if defined(__GLIBC__) && __GLIBC__ >= 2
1201# define LINUX_DATA_START
1202# else
1203 extern char **__environ;
1204# define DATASTART ((ptr_t)(&__environ))
1205 /* hideous kludge: __environ is the first */
1206 /* word in crt0.o, and delimits the start */
1207 /* of the data segment, no matter which */
1208 /* ld options were passed through. */
1209 /* We could use _etext instead, but that */
1210 /* would include .rodata, which may */
1211 /* contain large read-only data tables */
1212 /* that we'd rather not scan. */
1213# endif
1214 extern int _end;
1215# define DATAEND (&_end)
1216# else
1217 extern int etext;
1218# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
1219# endif
1220# endif
1221#endif
1222
1223#ifdef LINUX_DATA_START
1224 /* Some Linux distributions arrange to define __data_start. Some */
1225 /* define data_start as a weak symbol. The latter is technically */
1226 /* broken, since the user program may define data_start, in which */
1227 /* case we lose. Nonetheless, we try both, prefering __data_start. */
1228 /* We assume gcc. */
1229# pragma weak __data_start
1230 extern int __data_start;
1231# pragma weak data_start
1232 extern int data_start;
1233# define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
1234#endif
1235
1236# ifndef STACK_GROWS_UP
1237# define STACK_GROWS_DOWN
1238# endif
1239
1240# ifndef CPP_WORDSZ
1241# define CPP_WORDSZ 32
1242# endif
1243
1244# ifndef OS_TYPE
1245# define OS_TYPE ""
1246# endif
1247
1248# ifndef DATAEND
1249 extern int end;
1250# define DATAEND (&end)
1251# endif
1252
1253# if defined(SVR4) && !defined(GETPAGESIZE)
1254# include <unistd.h>
1255# define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1256# endif
1257
1258# ifndef GETPAGESIZE
1259# if defined(SUNOS5) || defined(IRIX5)
1260# include <unistd.h>
1261# endif
1262# define GETPAGESIZE() getpagesize()
1263# endif
1264
1265# if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
1266 /* OS has SVR4 generic features. Probably others also qualify. */
1267# define SVR4
1268# endif
1269
1270# if defined(SUNOS5) || defined(DRSNX)
1271 /* OS has SUNOS5 style semi-undocumented interface to dynamic */
1272 /* loader. */
1273# define SUNOS5DL
1274 /* OS has SUNOS5 style signal handlers. */
1275# define SUNOS5SIGS
1276# endif
1277
1278# if defined(HPUX)
1279# define SUNOS5SIGS
1280# endif
1281
1282# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
1283 -> bad word size
1284# endif
1285
1286# ifdef PCR
1287# undef DYNAMIC_LOADING
1288# undef STACKBOTTOM
1289# undef HEURISTIC1
1290# undef HEURISTIC2
1291# undef PROC_VDB
1292# undef MPROTECT_VDB
1293# define PCR_VDB
1294# endif
1295
1296# ifdef SRC_M3
1297/* Postponed for now. */
1298# undef PROC_VDB
1299# undef MPROTECT_VDB
1300# endif
1301
1302# ifdef SMALL_CONFIG
1303/* Presumably not worth the space it takes. */
1304# undef PROC_VDB
1305# undef MPROTECT_VDB
1306# endif
1307
1308# ifdef USE_MUNMAP
1309# undef MPROTECT_VDB /* Can't deal with address space holes. */
1310# endif
1311
1312# if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
1313# define DEFAULT_VDB
1314# endif
1315
1316# ifndef PREFETCH
1317# define PREFETCH(x)
1318# define NO_PREFETCH
1319# endif
1320
1321# ifndef PREFETCH_FOR_WRITE
1322# define PREFETCH_FOR_WRITE(x)
1323# define NO_PREFETCH_FOR_WRITE
1324# endif
1325
1326# ifndef CACHE_LINE_SIZE
1327# define CACHE_LINE_SIZE 32 /* Wild guess */
1328# endif
1329
1330# ifndef CLEAR_DOUBLE
1331# define CLEAR_DOUBLE(x) \
1332 ((word*)x)[0] = 0; \
1333 ((word*)x)[1] = 0;
1334# endif /* CLEAR_DOUBLE */
1335
1336# if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
1337# define SOLARIS_THREADS
1338# endif
1339# if defined(IRIX_THREADS) && !defined(IRIX5)
1340--> inconsistent configuration
1341# endif
1342# if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
1343--> inconsistent configuration
1344# endif
1345# if defined(LINUX_THREADS) && !defined(LINUX)
1346--> inconsistent configuration
1347# endif
1348# if defined(SOLARIS_THREADS) && !defined(SUNOS5)
1349--> inconsistent configuration
1350# endif
1351# if defined(HPUX_THREADS) && !defined(HPUX)
1352--> inconsistent configuration
1353# endif
1354# if defined(PCR) || defined(SRC_M3) || \
1355 defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
1356 defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
1357 defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
1358# define THREADS
1359# endif
1360
1361# if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
1362 || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
1363 /* Use setjmp based hack to mark from callee-save registers. */
1364# define USE_GENERIC_PUSH_REGS
1365# endif
1366# if defined(SPARC) && !defined(LINUX)
1367# define SAVE_CALL_CHAIN
1368# define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
1369 /* include assembly code to do it well. */
1370# endif
1371
1372# if defined(LINUX) && !defined(POWERPC)
bc286d9f 1373
9ec1e770 1374# if 0
155415a5
MV		 1375# include <linux/version.h>
1376# if (LINUX_VERSION_CODE <= 0x10400)
bc286d9f 1377 /* Ugly hack to get struct sigcontext_struct definition. Required */
155415a5
MV		 1378 /* for some early 1.3.X releases. Will hopefully go away soon. */
1379 /* in some later Linux releases, asm/sigcontext.h may have to */
1380 /* be included instead. */
1381# define __KERNEL__
1382# include <asm/signal.h>
1383# undef __KERNEL__
5159b336
MV		 1384# endif
1385
1386# else
bc286d9f 1387
155415a5
MV		 1388 /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
1389 /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
1390 /* prototypes, so we have to include the top-level sigcontext.h to */
1391 /* make sure the former gets defined to be the latter if appropriate. */
1392# include <features.h>
1393# if 2 <= __GLIBC__
1394# if 2 == __GLIBC__ && 0 == __GLIBC_MINOR__
1395 /* glibc 2.1 no longer has sigcontext.h. But signal.h */
1396 /* has the right declaration for glibc 2.1. */
1397# include <sigcontext.h>
1398# endif /* 0 == __GLIBC_MINOR__ */
1399# else /* not 2 <= __GLIBC__ */
1400 /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
1401 /* one. Check LINUX_VERSION_CODE to see which we should reference. */
1402# include <asm/sigcontext.h>
1403# endif /* 2 <= __GLIBC__ */
1404# endif
1405# endif
1406# if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
1407# include <sys/types.h>
1408# if !defined(MSWIN32) && !defined(SUNOS4)
1409# include <unistd.h>
1410# endif
1411# endif
1412
155415a5
MV		 1413# include <signal.h>
1414
1415/* Blatantly OS dependent routines, except for those that are related */
1416/* to dynamic loading. */
1417
1418# if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
1419# define NEED_FIND_LIMIT
1420# endif
1421
1422# if defined(IRIX_THREADS) || defined(HPUX_THREADS)
1423# define NEED_FIND_LIMIT
1424# endif
1425
1426# if (defined(SUNOS4) && defined(DYNAMIC_LOADING)) && !defined(PCR)
1427# define NEED_FIND_LIMIT
1428# endif
1429
1430# if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
1431# define NEED_FIND_LIMIT
1432# endif
1433
1434# if defined(LINUX) && \
1435 (defined(POWERPC) || defined(SPARC) || defined(ALPHA) || defined(IA64) \
1436 || defined(MIPS))
1437# define NEED_FIND_LIMIT
1438# endif
1439
1440#ifdef NEED_FIND_LIMIT
1441# include <setjmp.h>
1442#endif
1443
1444#ifdef FREEBSD
1445# include <machine/trap.h>
1446#endif
1447
1448#ifdef AMIGA
1449# include <proto/exec.h>
1450# include <proto/dos.h>
1451# include <dos/dosextens.h>
1452# include <workbench/startup.h>
1453#endif
1454
1455#ifdef MSWIN32
1456# define WIN32_LEAN_AND_MEAN
1457# define NOSERVICE
1458# include <windows.h>
1459#endif
1460
1461#ifdef MACOS
1462# include <Processes.h>
1463#endif
1464
1465#ifdef IRIX5
1466# include <sys/uio.h>
1467# include <malloc.h> /* for locking */
1468#endif
1469#ifdef USE_MMAP
1470# include <sys/types.h>
1471# include <sys/mman.h>
1472# include <sys/stat.h>
1473# include <fcntl.h>
1474#endif
1475
1476#ifdef SUNOS5SIGS
1477# include <sys/siginfo.h>
1478# undef setjmp
1479# undef longjmp
1480# define setjmp(env) sigsetjmp(env, 1)
1481# define longjmp(env, val) siglongjmp(env, val)
1482# define jmp_buf sigjmp_buf
1483#endif
1484
1485#ifdef DJGPP
1486 /* Apparently necessary for djgpp 2.01. May casuse problems with */
1487 /* other versions. */
1488 typedef long unsigned int caddr_t;
1489#endif
1490
1491#ifdef PCR
1492# include "il/PCR_IL.h"
1493# include "th/PCR_ThCtl.h"
1494# include "mm/PCR_MM.h"
1495#endif
1496
1497#if !defined(NO_EXECUTE_PERMISSION)
1498# define OPT_PROT_EXEC PROT_EXEC
1499#else
1500# define OPT_PROT_EXEC 0
1501#endif
1502
1503# ifdef OS2
1504
1505# include <stddef.h>
1506
1507# if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
1508
1509# else /* IBM's compiler */
1510
1511/* A kludge to get around what appears to be a header file bug */
1512# ifndef WORD
1513# define WORD unsigned short
1514# endif
1515# ifndef DWORD
1516# define DWORD unsigned long
1517# endif
1518
1519# define EXE386 1
1520# include <newexe.h>
1521# include <exe386.h>
1522
1523# endif /* __IBMC__ */
1524
1525# define INCL_DOSEXCEPTIONS
1526# define INCL_DOSPROCESS
1527# define INCL_DOSERRORS
1528# define INCL_DOSMODULEMGR
1529# define INCL_DOSMEMMGR
1530# include <os2.h>
1531
1532# endif /*!OS/2 */
1533
9ec1e770
TTN		 1534/*
1535 * Find the base of the stack.
155415a5
MV		 1536 * Used only in single-threaded environment.
1537 * With threads, GC_mark_roots needs to know how to do this.
1538 * Called with allocator lock held.
1539 */
9ec1e770 1540# ifdef MSWIN32
155415a5
MV		 1541# define is_writable(prot) ((prot) == PAGE_READWRITE \
1542 || (prot) == PAGE_WRITECOPY \
1543 || (prot) == PAGE_EXECUTE_READWRITE \
1544 || (prot) == PAGE_EXECUTE_WRITECOPY)
1545/* Return the number of bytes that are writable starting at p. */
1546/* The pointer p is assumed to be page aligned. */
1547/* If base is not 0, *base becomes the beginning of the */
1548/* allocation region containing p. */
1549static word GC_get_writable_length(ptr_t p, ptr_t *base)
1550{
1551 MEMORY_BASIC_INFORMATION buf;
1552 word result;
1553 word protect;
9ec1e770 1554
155415a5
MV		 1555 result = VirtualQuery(p, &buf, sizeof(buf));
1556 if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
1557 if (base != 0) *base = (ptr_t)(buf.AllocationBase);
1558 protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
1559 if (!is_writable(protect)) {
1560 return(0);
1561 }
1562 if (buf.State != MEM_COMMIT) return(0);
1563 return(buf.RegionSize);
1564}
1565
1566void *scm_get_stack_base()
1567{
1568 int dummy;
1569 ptr_t sp = (ptr_t)(&dummy);
70f95333
MV		 1570 ptr_t trunc_sp;
1571 word size;
1572 static word GC_page_size = 0;
1573 if (!GC_page_size) {
1574 SYSTEM_INFO sysinfo;
1575 GetSystemInfo(&sysinfo);
1576 GC_page_size = sysinfo.dwPageSize;
1577 }
1578 trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
1579 size = GC_get_writable_length(trunc_sp, 0);
155415a5
MV		 1580 return(trunc_sp + size);
1581}
1582
1583
1584# else
1585
1586# ifdef OS2
1587
1588void *scm_get_stack_base()
1589{
1590 PTIB ptib;
1591 PPIB ppib;
9ec1e770 1592
155415a5
MV		 1593 if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
1594 GC_err_printf0("DosGetInfoBlocks failed\n");
1595 ABORT("DosGetInfoBlocks failed\n");
1596 }
1597 return((ptr_t)(ptib -> tib_pstacklimit));
1598}
1599
1600# else
1601
1602# ifdef AMIGA
1603
1604void *scm_get_stack_base()
1605{
1606 struct Process *proc = (struct Process*)SysBase->ThisTask;
9ec1e770 1607
155415a5
MV		 1608 /* Reference: Amiga Guru Book Pages: 42,567,574 */
1609 if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS
1610 && proc->pr_CLI != NULL) {
1611 /* first ULONG is StackSize */
1612 /*longPtr = proc->pr_ReturnAddr;
1613 size = longPtr[0];*/
1614
1615 return (char *)proc->pr_ReturnAddr + sizeof(ULONG);
1616 } else {
1617 return (char *)proc->pr_Task.tc_SPUpper;
1618 }
1619}
1620
1621#if 0 /* old version */
1622void *scm_get_stack_base()
1623{
1624 extern struct WBStartup *_WBenchMsg;
1625 extern long __base;
1626 extern long __stack;
1627 struct Task *task;
1628 struct Process *proc;
1629 struct CommandLineInterface *cli;
1630 long size;
1631
1632 if ((task = FindTask(0)) == 0) {
1633 GC_err_puts("Cannot find own task structure\n");
1634 ABORT("task missing");
1635 }
1636 proc = (struct Process *)task;
1637 cli = BADDR(proc->pr_CLI);
1638
1639 if (_WBenchMsg != 0 || cli == 0) {
1640 size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
1641 } else {
1642 size = cli->cli_DefaultStack * 4;
1643 }
1644 return (ptr_t)(__base + GC_max(size, __stack));
1645}
1646#endif /* 0 */
1647
1648# else /* !AMIGA, !OS2, ... */
1649
1650# ifdef NEED_FIND_LIMIT
1651 /* Some tools to implement HEURISTIC2 */
1652# define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
1653 /* static */ jmp_buf GC_jmp_buf;
9ec1e770 1654
155415a5
MV		 1655 /*ARGSUSED*/
1656 static void GC_fault_handler(sig)
1657 int sig;
1658 {
1659 longjmp(GC_jmp_buf, 1);
1660 }
1661
1662# ifdef __STDC__
1663 typedef void (*handler)(int);
1664# else
1665 typedef void (*handler)();
1666# endif
1667
1668# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1669 static struct sigaction old_segv_act;
1670# if defined(_sigargs) || defined(HPUX) /* !Irix6.x */
1671 static struct sigaction old_bus_act;
1672# endif
1673# else
1674 static handler old_segv_handler, old_bus_handler;
1675# endif
9ec1e770 1676
155415a5
MV		 1677 static void GC_setup_temporary_fault_handler()
1678 {
1679# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1680 struct sigaction act;
1681
1682 act.sa_handler = GC_fault_handler;
1683 act.sa_flags = SA_RESTART | SA_NODEFER;
1684 /* The presence of SA_NODEFER represents yet another gross */
1685 /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
1686 /* interact correctly with -lthread. We hide the confusion */
1687 /* by making sure that signal handling doesn't affect the */
1688 /* signal mask. */
1689
1690 (void) sigemptyset(&act.sa_mask);
1691# ifdef IRIX_THREADS
1692 /* Older versions have a bug related to retrieving and */
1693 /* and setting a handler at the same time. */
1694 (void) sigaction(SIGSEGV, 0, &old_segv_act);
1695 (void) sigaction(SIGSEGV, &act, 0);
1696# else
1697 (void) sigaction(SIGSEGV, &act, &old_segv_act);
1698# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1699 || defined(HPUX)
1700 /* Under Irix 5.x or HP/UX, we may get SIGBUS. */
1701 /* Pthreads doesn't exist under Irix 5.x, so we */
1702 /* don't have to worry in the threads case. */
1703 (void) sigaction(SIGBUS, &act, &old_bus_act);
1704# endif
1705# endif /* IRIX_THREADS */
1706# else
1707 old_segv_handler = signal(SIGSEGV, GC_fault_handler);
1708# ifdef SIGBUS
1709 old_bus_handler = signal(SIGBUS, GC_fault_handler);
1710# endif
1711# endif
1712 }
9ec1e770 1713
155415a5
MV		 1714 static void GC_reset_fault_handler()
1715 {
1716# if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1717 (void) sigaction(SIGSEGV, &old_segv_act, 0);
1718# if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1719 || defined(HPUX)
1720 (void) sigaction(SIGBUS, &old_bus_act, 0);
1721# endif
1722# else
1723 (void) signal(SIGSEGV, old_segv_handler);
1724# ifdef SIGBUS
1725 (void) signal(SIGBUS, old_bus_handler);
1726# endif
1727# endif
1728 }
1729
9ec1e770
TTN		 1730 /* Single argument version, robust against whole program analysis. */
1731 static void
1732 GC_noop1(x)
1733 word x;
1734 {
1735 static VOLATILE word sink;
1736 sink = x;
1737 }
1738
155415a5
MV		 1739 /* Return the first nonaddressible location > p (up) or */
1740 /* the smallest location q s.t. [q,p] is addressible (!up). */
1741 static ptr_t GC_find_limit(p, up)
1742 ptr_t p;
1743 GC_bool up;
1744 {
1745 static VOLATILE ptr_t result;
1746 /* Needs to be static, since otherwise it may not be */
1747 /* preserved across the longjmp. Can safely be */
1748 /* static since it's only called once, with the */
1749 /* allocation lock held. */
1750
1751
1752 GC_setup_temporary_fault_handler();
1753 if (setjmp(GC_jmp_buf) == 0) {
1754 result = (ptr_t)(((word)(p))
1755 & ~(MIN_PAGE_SIZE-1));
1756 for (;;) {
1757 if (up) {
1758 result += MIN_PAGE_SIZE;
1759 } else {
1760 result -= MIN_PAGE_SIZE;
1761 }
1762 GC_noop1((word)(*result));
1763 }
1764 }
1765 GC_reset_fault_handler();
1766 if (!up) {
1767 result += MIN_PAGE_SIZE;
1768 }
1769 return(result);
1770 }
d315ea8c 1771
155415a5
MV		 1772# endif
1773
1774#ifdef LINUX_STACKBOTTOM
1775
1776#include <sys/types.h>
1777#include <sys/stat.h>
1778#include <fcntl.h>
1779
1780# define STAT_SKIP 27 /* Number of fields preceding startstack */
1781 /* field in /proc/self/stat */
1782
1783 static ptr_t GC_linux_stack_base(void)
1784 {
1785 /* We read the stack base value from /proc/self/stat. We do this */
1786 /* using direct I/O system calls in order to avoid calling malloc */
9ec1e770 1787 /* in case REDIRECT_MALLOC is defined. */
155415a5
MV		 1788# define STAT_BUF_SIZE 4096
1789# ifdef USE_LD_WRAP
1790# define STAT_READ __real_read
1791# else
1792# define STAT_READ read
9ec1e770 1793# endif
155415a5
MV		 1794 char stat_buf[STAT_BUF_SIZE];
1795 int f;
1796 char c;
1797 word result = 0;
1798 size_t i, buf_offset = 0;
1799
1800 f = open("/proc/self/stat", O_RDONLY);
1801 if (f < 0 || STAT_READ(f, stat_buf, STAT_BUF_SIZE) < 2 * STAT_SKIP) {
1802 ABORT("Couldn't read /proc/self/stat");
1803 }
1804 c = stat_buf[buf_offset++];
1805 /* Skip the required number of fields. This number is hopefully */
1806 /* constant across all Linux implementations. */
1807 for (i = 0; i < STAT_SKIP; ++i) {
1808 while (isspace(c)) c = stat_buf[buf_offset++];
1809 while (!isspace(c)) c = stat_buf[buf_offset++];
1810 }
1811 while (isspace(c)) c = stat_buf[buf_offset++];
1812 while (isdigit(c)) {
1813 result *= 10;
1814 result += c - '0';
1815 c = stat_buf[buf_offset++];
1816 }
1817 close(f);
1818 if (result < 0x10000000) ABORT("Absurd stack bottom value");
1819 return (ptr_t)result;
1820 }
1821
1822#endif /* LINUX_STACKBOTTOM */
1823
1824void *scm_get_stack_base()
9500b5b9 1825{
155415a5
MV		 1826 word dummy;
1827 void *result = &dummy; /* initialize to silence compiler */
1828
1829# define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
1830
1831# ifdef STACKBOTTOM
1832 return(STACKBOTTOM);
1833# else
1834# ifdef HEURISTIC1
1835# ifdef STACK_GROWS_DOWN
1836 result = (ptr_t)((((word)(&dummy))
1837 + STACKBOTTOM_ALIGNMENT_M1)
1838 & ~STACKBOTTOM_ALIGNMENT_M1);
1839# else
1840 result = (ptr_t)(((word)(&dummy))
1841 & ~STACKBOTTOM_ALIGNMENT_M1);
1842# endif
1843# endif /* HEURISTIC1 */
1844# ifdef LINUX_STACKBOTTOM
1845 result = GC_linux_stack_base();
1846# endif
1847# ifdef HEURISTIC2
1848# ifdef STACK_GROWS_DOWN
1849 result = GC_find_limit((ptr_t)(&dummy), TRUE);
1850# ifdef HEURISTIC2_LIMIT
1851 if (result > HEURISTIC2_LIMIT
1852 && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
1853 result = HEURISTIC2_LIMIT;
1854 }
1855# endif
1856# else
1857 result = GC_find_limit((ptr_t)(&dummy), FALSE);
1858# ifdef HEURISTIC2_LIMIT
1859 if (result < HEURISTIC2_LIMIT
1860 && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
1861 result = HEURISTIC2_LIMIT;
1862 }
1863# endif
1864# endif
1865
1866# endif /* HEURISTIC2 */
1867# ifdef STACK_GROWS_DOWN
1868 if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
1869# endif
1870 return(result);
1871# endif /* STACKBOTTOM */
9500b5b9 1872}
155415a5
MV		 1873
1874# endif /* ! AMIGA */
1875# endif /* ! OS2 */
1876# endif /* ! MSWIN32 */
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