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