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Revision 1.24 - (show annotations) (download)
Mon Nov 29 21:13:57 2004 UTC (19 years, 5 months ago) by kryde
Branch: MAIN
CVS Tags: branch-root_release-1-8, release_1-7-2, branch-root_mvo-thread-cleanup
Branch point for: branch_mvo-thread-cleanup, branch_release-1-8
Changes since 1.23: +5 -3 lines
File MIME type: text/plain
(NetBSD): Test __m68k__ and __arm__ as well as m68k and
arm32.  Reported by Greg Troxel.

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

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