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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, 2003, 2004, 2006, 2008 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(__alpha__)
114 # define ALPHA
115 # define NETBSD
116 # define mach_type_known
117 # endif
118 # if defined(__NetBSD__) && defined(__powerpc__)
119 # define POWERPC
120 # define NETBSD
121 # define mach_type_known
122 # endif
123 /* in netbsd 2.0 only __m68k__ is defined, not m68k */
124 # if defined(__NetBSD__) && (defined(m68k) || defined(__m68k__))
125 # define M68K
126 # define NETBSD
127 # define mach_type_known
128 # endif
129 /* in netbsd 2.0 only __arm__ is defined, not arm32 */
130 # if defined(__NetBSD__) && (defined(arm32) || defined(__arm__))
131 # define ARM32
132 # define NETBSD
133 # define mach_type_known
134 # endif
135 # if defined(__NetBSD__) && defined(__sparc__)
136 # define SPARC
137 # define NETBSD
138 # define mach_type_known
139 # endif
140 # if defined(vax)
141 # define VAX
142 # ifdef ultrix
143 # define ULTRIX
144 # else
145 # define BSD
146 # endif
147 # define mach_type_known
148 # endif
149 # if defined(mips) || defined(__mips)
150 # define MIPS
151 # if !defined(LINUX)
152 # if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)
153 # define ULTRIX
154 # else
155 # if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \
156 || defined(__SYSTYPE_SVR4__)
157 # define IRIX5 /* or IRIX 6.X */
158 # else
159 # define RISCOS /* or IRIX 4.X */
160 # endif
161 # endif
162 # endif /* !LINUX */
163 # define mach_type_known
164 # endif
165 # if defined(sequent) && defined(i386)
166 # define I386
167 # define SEQUENT
168 # define mach_type_known
169 # endif
170 # if defined(sun) && defined(i386)
171 # define I386
172 # define SUNOS5
173 # define mach_type_known
174 # endif
175 # if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
176 # define I386
177 # define OS2
178 # define mach_type_known
179 # endif
180 # if defined(ibm032)
181 # define RT
182 # define mach_type_known
183 # endif
184 # if defined(sun) && (defined(sparc) || defined(__sparc))
185 # define SPARC
186 /* Test for SunOS 5.x */
187 # include <errno.h>
188 # ifdef ECHRNG
189 # define SUNOS5
190 # else
191 # define SUNOS4
192 # endif
193 # define mach_type_known
194 # endif
195 # if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
196 && !defined(__OpenBSD__)
197 # define SPARC
198 # define DRSNX
199 # define mach_type_known
200 # endif
201 # if defined(_IBMR2)
202 # define RS6000
203 # define mach_type_known
204 # endif
205 # if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
206 /* The above test may need refinement */
207 # define I386
208 # if defined(_SCO_ELF)
209 # define SCO_ELF
210 # else
211 # define SCO
212 # endif
213 # define mach_type_known
214 # endif
215 # if defined(_AUX_SOURCE)
216 # define M68K
217 # define SYSV
218 # define mach_type_known
219 # endif
220 # if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
221 || defined(hppa) || defined(__hppa__)
222 # define HP_PA
223 # ifndef LINUX
224 # define HPUX
225 # endif
226 # define mach_type_known
227 # endif
228 # if defined(LINUX) && (defined(i386) || defined(__i386__))
229 # define I386
230 # define mach_type_known
231 # endif
232 # if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
233 # define IA64
234 # define mach_type_known
235 # endif
236 # if defined(LINUX) && defined(powerpc)
237 # define POWERPC
238 # define mach_type_known
239 # endif
240 # if defined(LINUX) && defined(__mc68000__)
241 # define M68K
242 # define mach_type_known
243 # endif
244 # if defined(LINUX) && (defined(sparc) || defined(__sparc__))
245 # define SPARC
246 # define mach_type_known
247 # endif
248 # if defined(LINUX) && (defined(arm) || defined (__arm__))
249 # define ARM32
250 # define mach_type_known
251 # endif
252 # if defined(__alpha) || defined(__alpha__)
253 # define ALPHA
254 # if !defined(LINUX) && !defined (NETBSD)
255 # define OSF1 /* a.k.a Digital Unix */
256 # endif
257 # define mach_type_known
258 # endif
259 # if defined(_AMIGA) && !defined(AMIGA)
260 # define AMIGA
261 # endif
262 # ifdef AMIGA
263 # define M68K
264 # define mach_type_known
265 # endif
266 # if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
267 # define M68K
268 # define MACOS
269 # define mach_type_known
270 # endif
271 # if defined(__MWERKS__) && defined(__powerc)
272 # define POWERPC
273 # define MACOS
274 # define mach_type_known
275 # endif
276 # if defined(macosx) || \
277 (defined(__APPLE__) && defined(__MACH__) && defined(__ppc__))
278 # define MACOSX
279 # define POWERPC
280 # define mach_type_known
281 # endif
282 # if defined(NeXT) && defined(mc68000)
283 # define M68K
284 # define NEXT
285 # define mach_type_known
286 # endif
287 # if defined(NeXT) && defined(i386)
288 # define I386
289 # define NEXT
290 # define mach_type_known
291 # endif
292 # if defined(__OpenBSD__) && (defined(i386) || defined(__i386__))
293 # define I386
294 # define OPENBSD
295 # define mach_type_known
296 # endif
297 # if defined(__FreeBSD__) && defined(i386)
298 # define I386
299 # define FREEBSD
300 # define mach_type_known
301 # endif
302 # if defined(__NetBSD__) && defined(i386)
303 # define I386
304 # define NETBSD
305 # define mach_type_known
306 # endif
307 # if defined(bsdi) && defined(i386)
308 # define I386
309 # define BSDI
310 # define mach_type_known
311 # endif
312 # if !defined(mach_type_known) && defined(__386BSD__)
313 # define I386
314 # define THREE86BSD
315 # define mach_type_known
316 # endif
317 # if defined(_CX_UX) && defined(_M88K)
318 # define M88K
319 # define CX_UX
320 # define mach_type_known
321 # endif
322 # if defined(DGUX)
323 # define M88K
324 /* DGUX defined */
325 # define mach_type_known
326 # endif
327 # if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
328 || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
329 # define I386
330 # define MSWIN32 /* or Win32s */
331 # define mach_type_known
332 # endif
333 # if defined(__DJGPP__)
334 # define I386
335 # ifndef DJGPP
336 # define DJGPP /* MSDOS running the DJGPP port of GCC */
337 # endif
338 # define mach_type_known
339 # endif
340 # if defined(__CYGWIN32__) || defined(__CYGWIN__)
341 # define I386
342 # define CYGWIN32
343 # define mach_type_known
344 # endif
345 # if defined(__MINGW32__)
346 # define I386
347 # define MSWIN32
348 # define mach_type_known
349 # endif
350 # if defined(__BORLANDC__)
351 # define I386
352 # define MSWIN32
353 # define mach_type_known
354 # endif
355 # if defined(_UTS) && !defined(mach_type_known)
356 # define S370
357 # define UTS4
358 # define mach_type_known
359 # endif
360 # if defined(__pj__)
361 # define PJ
362 # define mach_type_known
363 # endif
364 /* Ivan Demakov */
365 # if defined(__WATCOMC__) && defined(__386__)
366 # define I386
367 # if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
368 # if defined(__OS2__)
369 # define OS2
370 # else
371 # if defined(__WINDOWS_386__) || defined(__NT__)
372 # define MSWIN32
373 # else
374 # define DOS4GW
375 # endif
376 # endif
377 # endif
378 # define mach_type_known
379 # endif
380 # if defined(__s390__) && defined(LINUX)
381 # define S370
382 # define mach_type_known
383 # endif
384 # if defined(__GNU__)
385 # define I386
386 # define GNU
387 # define mach_type_known
388 # endif
389 # if defined(__SCO_VERSION__)
390 # define I386
391 # define SYSV
392 # define mach_type_known
393 # endif
394
395 /* Feel free to add more clauses here */
396
397 /* Or manually define the machine type here. A machine type is */
398 /* characterized by the architecture. Some */
399 /* machine types are further subdivided by OS. */
400 /* the macros ULTRIX, RISCOS, and BSD to distinguish. */
401 /* Note that SGI IRIX is treated identically to RISCOS. */
402 /* SYSV on an M68K actually means A/UX. */
403 /* The distinction in these cases is usually the stack starting address */
404 # ifndef mach_type_known
405
406 void *
407 scm_get_stack_base ()
408 {
409 ABORT ("Can't determine stack base");
410 return NULL;
411 }
412
413 # else
414 /* Mapping is: M68K ==> Motorola 680X0 */
415 /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
416 /* MACOS and AMIGA variants) */
417 /* I386 ==> Intel 386 */
418 /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
419 /* FREEBSD, THREE86BSD, MSWIN32, */
420 /* BSDI,SUNOS5, NEXT, other variants) */
421 /* NS32K ==> Encore Multimax */
422 /* MIPS ==> R2000 or R3000 */
423 /* (RISCOS, ULTRIX variants) */
424 /* VAX ==> DEC VAX */
425 /* (BSD, ULTRIX variants) */
426 /* RS6000 ==> IBM RS/6000 AIX3.X */
427 /* RT ==> IBM PC/RT */
428 /* HP_PA ==> HP9000/700 & /800 */
429 /* HP/UX */
430 /* SPARC ==> SPARC under SunOS */
431 /* (SUNOS4, SUNOS5, */
432 /* DRSNX variants) */
433 /* ALPHA ==> DEC Alpha */
434 /* (OSF1 and LINUX variants) */
435 /* M88K ==> Motorola 88XX0 */
436 /* (CX_UX and DGUX) */
437 /* S370 ==> 370-like machine */
438 /* running Amdahl UTS4 */
439 /* ARM32 ==> Intel StrongARM */
440 /* IA64 ==> Intel IA64 */
441 /* (e.g. Itanium) */
442
443
444 /*
445 * For each architecture and OS, the following need to be defined:
446 *
447 * CPP_WORD_SZ is a simple integer constant representing the word size.
448 * in bits. We assume byte addressibility, where a byte has 8 bits.
449 * We also assume CPP_WORD_SZ is either 32 or 64.
450 * (We care about the length of pointers, not hardware
451 * bus widths. Thus a 64 bit processor with a C compiler that uses
452 * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
453 *
454 * MACH_TYPE is a string representation of the machine type.
455 * OS_TYPE is analogous for the OS.
456 *
457 * ALIGNMENT is the largest N, such that
458 * all pointer are guaranteed to be aligned on N byte boundaries.
459 * defining it to be 1 will always work, but perform poorly.
460 *
461 * DATASTART is the beginning of the data segment.
462 * On UNIX systems, the collector will scan the area between DATASTART
463 * and DATAEND for root pointers.
464 *
465 * DATAEND, if not &end.
466 *
467 * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
468 * the pointer size.
469 *
470 * STACKBOTTOM is the cool end of the stack, which is usually the
471 * highest address in the stack.
472 * Under PCR or OS/2, we have other ways of finding thread stacks.
473 * For each machine, the following should:
474 * 1) define SCM_STACK_GROWS_UP if the stack grows toward higher addresses, and
475 * 2) define exactly one of
476 * STACKBOTTOM (should be defined to be an expression)
477 * HEURISTIC1
478 * HEURISTIC2
479 * If either of the last two macros are defined, then STACKBOTTOM is computed
480 * during collector startup using one of the following two heuristics:
481 * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
482 * the next multiple of STACK_GRAN.
483 * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
484 * in small steps (decrement if SCM_STACK_GROWS_UP), and read the value
485 * at each location. Remember the value when the first
486 * Segmentation violation or Bus error is signalled. Round that
487 * to the nearest plausible page boundary, and use that instead
488 * of STACKBOTTOM.
489 *
490 * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
491 * the value of environ is a pointer that can serve as STACKBOTTOM.
492 * I expect that HEURISTIC2 can be replaced by this approach, which
493 * interferes far less with debugging.
494 *
495 * If no expression for STACKBOTTOM can be found, and neither of the above
496 * heuristics are usable, the collector can still be used with all of the above
497 * undefined, provided one of the following is done:
498 * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
499 * without reference to STACKBOTTOM. This is appropriate for use in
500 * conjunction with thread packages, since there will be multiple stacks.
501 * (Allocating thread stacks in the heap, and treating them as ordinary
502 * heap data objects is also possible as a last resort. However, this is
503 * likely to introduce significant amounts of excess storage retention
504 * unless the dead parts of the thread stacks are periodically cleared.)
505 * 2) Client code may set GC_stackbottom before calling any GC_ routines.
506 * If the author of the client code controls the main program, this is
507 * easily accomplished by introducing a new main program, setting
508 * GC_stackbottom to the address of a local variable, and then calling
509 * the original main program. The new main program would read something
510 * like:
511 *
512 * # include "gc_private.h"
513 *
514 * main(argc, argv, envp)
515 * int argc;
516 * char **argv, **envp;
517 * {
518 * int dummy;
519 *
520 * GC_stackbottom = (ptr_t)(&dummy);
521 * return(real_main(argc, argv, envp));
522 * }
523 *
524 *
525 * Each architecture may also define the style of virtual dirty bit
526 * implementation to be used:
527 * MPROTECT_VDB: Write protect the heap and catch faults.
528 * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
529 *
530 * An architecture may define DYNAMIC_LOADING if dynamic_load.c
531 * defined GC_register_dynamic_libraries() for the architecture.
532 *
533 * An architecture may define PREFETCH(x) to preload the cache with *x.
534 * This defaults to a no-op.
535 *
536 * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
537 *
538 * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
539 * clear the two words at GC_malloc-aligned address x. By default,
540 * word stores of 0 are used instead.
541 */
542
543
544 # define STACK_GRAN 0x1000000
545 # ifdef M68K
546 # define MACH_TYPE "M68K"
547 # define ALIGNMENT 2
548 # ifdef OPENBSD
549 # define OS_TYPE "OPENBSD"
550 # define HEURISTIC2
551 extern char etext;
552 # define DATASTART ((ptr_t)(&etext))
553 # endif
554 # ifdef NETBSD
555 # define OS_TYPE "NETBSD"
556 # define HEURISTIC2
557 extern char etext;
558 # define DATASTART ((ptr_t)(&etext))
559 # endif
560 # ifdef LINUX
561 # define OS_TYPE "LINUX"
562 # define STACKBOTTOM ((ptr_t)0xf0000000)
563 # define MPROTECT_VDB
564 # ifdef __ELF__
565 # define DYNAMIC_LOADING
566 extern char **__environ;
567 # define DATASTART ((ptr_t)(&__environ))
568 /* hideous kludge: __environ is the first */
569 /* word in crt0.o, and delimits the start */
570 /* of the data segment, no matter which */
571 /* ld options were passed through. */
572 /* We could use _etext instead, but that */
573 /* would include .rodata, which may */
574 /* contain large read-only data tables */
575 /* that we'd rather not scan. */
576 extern int _end;
577 # define DATAEND (&_end)
578 # else
579 extern int etext;
580 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
581 # endif
582 # endif
583 # ifdef SUNOS4
584 # define OS_TYPE "SUNOS4"
585 extern char etext;
586 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
587 # define HEURISTIC1 /* differs */
588 # define DYNAMIC_LOADING
589 # endif
590 # ifdef HP
591 # define OS_TYPE "HP"
592 extern char etext;
593 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
594 # define STACKBOTTOM ((ptr_t) 0xffeffffc)
595 /* empirically determined. seems to work. */
596 # include <unistd.h>
597 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
598 # endif
599 # ifdef SYSV
600 # define OS_TYPE "SYSV"
601 extern etext;
602 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
603 & ~0x3fffff) \
604 +((word)&etext & 0x1fff))
605 /* This only works for shared-text binaries with magic number 0413.
606 The other sorts of SysV binaries put the data at the end of the text,
607 in which case the default of &etext would work. Unfortunately,
608 handling both would require having the magic-number available.
609 -- Parag
610 */
611 # define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
612 /* The stack starts at the top of memory, but */
613 /* 0x0 cannot be used as setjump_test complains */
614 /* that the stack direction is incorrect. Two */
615 /* bytes down from 0x0 should be safe enough. */
616 /* --Parag */
617 # include <sys/mmu.h>
618 # define GETPAGESIZE() PAGESIZE /* Is this still right? */
619 # endif
620 # ifdef AMIGA
621 # define OS_TYPE "AMIGA"
622 /* STACKBOTTOM and DATASTART handled specially */
623 /* in os_dep.c */
624 # define DATAEND /* not needed */
625 # define GETPAGESIZE() 4096
626 # endif
627 # ifdef MACOS
628 # ifndef __LOWMEM__
629 # include <LowMem.h>
630 # endif
631 # define OS_TYPE "MACOS"
632 /* see os_dep.c for details of global data segments. */
633 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
634 # define DATAEND /* not needed */
635 # define GETPAGESIZE() 4096
636 # endif
637 # ifdef NEXT
638 # define OS_TYPE "NEXT"
639 # define DATASTART ((ptr_t) get_etext())
640 # define STACKBOTTOM ((ptr_t) 0x4000000)
641 # define DATAEND /* not needed */
642 # endif
643 # endif
644
645 # ifdef POWERPC
646 # define MACH_TYPE "POWERPC"
647 # ifdef MACOS
648 # define ALIGNMENT 2 /* Still necessary? Could it be 4? */
649 # ifndef __LOWMEM__
650 # include <LowMem.h>
651 # endif
652 # define OS_TYPE "MACOS"
653 /* see os_dep.c for details of global data segments. */
654 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
655 # define DATAEND /* not needed */
656 # endif
657 # ifdef LINUX
658 # define ALIGNMENT 4 /* Guess. Can someone verify? */
659 /* This was 2, but that didn't sound right. */
660 # define OS_TYPE "LINUX"
661 # define HEURISTIC1
662 # define DYNAMIC_LOADING
663 # undef STACK_GRAN
664 # define STACK_GRAN 0x10000000
665 /* Stack usually starts at 0x80000000 */
666 # define LINUX_DATA_START
667 extern int _end;
668 # define DATAEND (&_end)
669 # endif
670 # ifdef MACOSX
671 # define ALIGNMENT 4
672 # define OS_TYPE "MACOSX"
673 # define DATASTART ((ptr_t) get_etext())
674 # define STACKBOTTOM ((ptr_t) 0xc0000000)
675 # define DATAEND /* not needed */
676 # endif
677 # endif
678
679 # ifdef VAX
680 # define MACH_TYPE "VAX"
681 # define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
682 extern char etext;
683 # define DATASTART ((ptr_t)(&etext))
684 # ifdef BSD
685 # define OS_TYPE "BSD"
686 # define HEURISTIC1
687 /* HEURISTIC2 may be OK, but it's hard to test. */
688 # endif
689 # ifdef ULTRIX
690 # define OS_TYPE "ULTRIX"
691 # define STACKBOTTOM ((ptr_t) 0x7fffc800)
692 # endif
693 # endif
694
695 # ifdef RT
696 # define MACH_TYPE "RT"
697 # define ALIGNMENT 4
698 # define DATASTART ((ptr_t) 0x10000000)
699 # define STACKBOTTOM ((ptr_t) 0x1fffd800)
700 # endif
701
702 # ifdef SPARC
703 # define MACH_TYPE "SPARC"
704 # define ALIGNMENT 4 /* Required by hardware */
705 # define ALIGN_DOUBLE
706 extern int etext;
707 # ifdef SUNOS5
708 # define OS_TYPE "SUNOS5"
709 extern int _etext;
710 extern int _end;
711 extern char * GC_SysVGetDataStart();
712 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
713 # define DATAEND (&_end)
714 # ifndef USE_MMAP
715 # define USE_MMAP
716 # endif
717 # ifdef USE_MMAP
718 # define HEAP_START (ptr_t)0x40000000
719 # else
720 # define HEAP_START DATAEND
721 # endif
722 # define PROC_VDB
723 /* HEURISTIC1 reportedly no longer works under 2.7. Thus we */
724 /* switched to HEURISTIC2, eventhough it creates some debugging */
725 /* issues. */
726 # define HEURISTIC2
727 # include <unistd.h>
728 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
729 /* getpagesize() appeared to be missing from at least one */
730 /* Solaris 5.4 installation. Weird. */
731 # define DYNAMIC_LOADING
732 # endif
733 # ifdef SUNOS4
734 # define OS_TYPE "SUNOS4"
735 /* [If you have a weak stomach, don't read this.] */
736 /* We would like to use: */
737 /* # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
738 /* This fails occasionally, due to an ancient, but very */
739 /* persistent ld bug. &etext is set 32 bytes too high. */
740 /* We instead read the text segment size from the a.out */
741 /* header, which happens to be mapped into our address space */
742 /* at the start of the text segment. The detective work here */
743 /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
744 /* Serpette of INRIA. */
745 /* This assumes ZMAGIC, i.e. demand-loadable executables. */
746 # define TEXTSTART 0x2000
747 # define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
748 # define MPROTECT_VDB
749 # define HEURISTIC1
750 # define DYNAMIC_LOADING
751 # endif
752 # ifdef DRSNX
753 # define CPP_WORDSZ 32
754 # define OS_TYPE "DRSNX"
755 extern char * GC_SysVGetDataStart();
756 extern int etext;
757 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
758 # define MPROTECT_VDB
759 # define STACKBOTTOM ((ptr_t) 0xdfff0000)
760 # define DYNAMIC_LOADING
761 # endif
762 # ifdef LINUX
763 # define OS_TYPE "LINUX"
764 # ifdef __ELF__
765 # define LINUX_DATA_START
766 # define DYNAMIC_LOADING
767 # else
768 Linux Sparc non elf ?
769 # endif
770 extern int _end;
771 # define DATAEND (&_end)
772 # define SVR4
773 # define STACKBOTTOM ((ptr_t) 0xf0000000)
774 # endif
775 # ifdef OPENBSD
776 # define OS_TYPE "OPENBSD"
777 # define STACKBOTTOM ((ptr_t) 0xf8000000)
778 # define DATASTART ((ptr_t)(&etext))
779 # endif
780 # endif
781
782 # ifdef I386
783 # define MACH_TYPE "I386"
784 # define ALIGNMENT 4 /* Appears to hold for all "32 bit" compilers */
785 /* except Borland. The -a4 option fixes */
786 /* Borland. */
787 /* Ivan Demakov: For Watcom the option is -zp4. */
788 # ifndef SMALL_CONFIG
789 # define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
790 /* improvement on Pentiums. */
791 # endif
792 # ifdef SEQUENT
793 # define OS_TYPE "SEQUENT"
794 extern int etext;
795 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
796 # define STACKBOTTOM ((ptr_t) 0x3ffff000)
797 # endif
798 # ifdef SUNOS5
799 # define OS_TYPE "SUNOS5"
800 extern int etext, _start;
801 extern char * GC_SysVGetDataStart();
802 # define DATASTART GC_SysVGetDataStart(0x1000, &etext)
803 # define STACKBOTTOM ((ptr_t)(&_start))
804 /** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
805 /*# define PROC_VDB*/
806 # define DYNAMIC_LOADING
807 # ifndef USE_MMAP
808 # define USE_MMAP
809 # endif
810 # ifdef USE_MMAP
811 # define HEAP_START (ptr_t)0x40000000
812 # else
813 # define HEAP_START DATAEND
814 # endif
815 # endif
816 # ifdef SCO
817 # define OS_TYPE "SCO"
818 extern int etext;
819 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
820 & ~0x3fffff) \
821 +((word)&etext & 0xfff))
822 # define STACKBOTTOM ((ptr_t) 0x7ffffffc)
823 # endif
824 # ifdef SCO_ELF
825 # define OS_TYPE "SCO_ELF"
826 extern int etext;
827 # define DATASTART ((ptr_t)(&etext))
828 # define STACKBOTTOM ((ptr_t) 0x08048000)
829 # define DYNAMIC_LOADING
830 # define ELF_CLASS ELFCLASS32
831 # endif
832 # ifdef LINUX
833 # define OS_TYPE "LINUX"
834 # define LINUX_STACKBOTTOM
835 # if 0
836 # define HEURISTIC1
837 # undef STACK_GRAN
838 # define STACK_GRAN 0x10000000
839 /* STACKBOTTOM is usually 0xc0000000, but this changes with */
840 /* different kernel configurations. In particular, systems */
841 /* with 2GB physical memory will usually move the user */
842 /* address space limit, and hence initial SP to 0x80000000. */
843 # endif
844 # if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
845 # define MPROTECT_VDB
846 # else
847 /* We seem to get random errors in incremental mode, */
848 /* possibly because Linux threads is itself a malloc client */
849 /* and can't deal with the signals. */
850 # endif
851 # ifdef __ELF__
852 # define DYNAMIC_LOADING
853 # ifdef UNDEFINED /* includes ro data */
854 extern int _etext;
855 # define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
856 # endif
857 # include <features.h>
858 # if defined(__GLIBC__) && __GLIBC__ >= 2
859 # define LINUX_DATA_START
860 # else
861 extern char **__environ;
862 # define DATASTART ((ptr_t)(&__environ))
863 /* hideous kludge: __environ is the first */
864 /* word in crt0.o, and delimits the start */
865 /* of the data segment, no matter which */
866 /* ld options were passed through. */
867 /* We could use _etext instead, but that */
868 /* would include .rodata, which may */
869 /* contain large read-only data tables */
870 /* that we'd rather not scan. */
871 # endif
872 extern int _end;
873 # define DATAEND (&_end)
874 # else
875 extern int etext;
876 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
877 # endif
878 # ifdef USE_I686_PREFETCH
879 # define PREFETCH(x) \
880 __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))
881 /* Empirically prefetcht0 is much more effective at reducing */
882 /* cache miss stalls for the targetted load instructions. But it */
883 /* seems to interfere enough with other cache traffic that the net */
884 /* result is worse than prefetchnta. */
885 # if 0
886 /* Using prefetches for write seems to have a slight negative */
887 /* impact on performance, at least for a PIII/500. */
888 # define PREFETCH_FOR_WRITE(x) \
889 __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))
890 # endif
891 # endif
892 # ifdef USE_3DNOW_PREFETCH
893 # define PREFETCH(x) \
894 __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))
895 # define PREFETCH_FOR_WRITE(x)
896 __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))
897 # endif
898 # endif
899 # ifdef CYGWIN32
900 # define OS_TYPE "CYGWIN32"
901 extern int _data_start__;
902 extern int _data_end__;
903 extern int _bss_start__;
904 extern int _bss_end__;
905 /* For binutils 2.9.1, we have */
906 /* DATASTART = _data_start__ */
907 /* DATAEND = _bss_end__ */
908 /* whereas for some earlier versions it was */
909 /* DATASTART = _bss_start__ */
910 /* DATAEND = _data_end__ */
911 /* To get it right for both, we take the */
912 /* minumum/maximum of the two. */
913 # define MAX(x,y) ((x) > (y) ? (x) : (y))
914 # define MIN(x,y) ((x) < (y) ? (x) : (y))
915 # define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
916 # define DATAEND ((ptr_t) MAX(&_data_end__, &_bss_end__))
917 # undef STACK_GRAN
918 # define STACK_GRAN 0x10000
919 # define HEURISTIC1
920 # endif
921 # ifdef OS2
922 # define OS_TYPE "OS2"
923 /* STACKBOTTOM and DATASTART are handled specially in */
924 /* os_dep.c. OS2 actually has the right */
925 /* system call! */
926 # define DATAEND /* not needed */
927 # endif
928 # ifdef MSWIN32
929 # define OS_TYPE "MSWIN32"
930 /* STACKBOTTOM and DATASTART are handled specially in */
931 /* os_dep.c. */
932 # ifndef __WATCOMC__
933 # define MPROTECT_VDB
934 # endif
935 # define DATAEND /* not needed */
936 # endif
937 # ifdef DJGPP
938 # define OS_TYPE "DJGPP"
939 # include "stubinfo.h"
940 extern int etext;
941 extern int _stklen;
942 extern int __djgpp_stack_limit;
943 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
944 /* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
945 + _stklen)) */
946 # define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
947 /* This may not be right. */
948 # endif
949 # ifdef OPENBSD
950 # define OS_TYPE "OPENBSD"
951 # endif
952 # ifdef FREEBSD
953 # define OS_TYPE "FREEBSD"
954 # define MPROTECT_VDB
955 # endif
956 # ifdef NETBSD
957 # define OS_TYPE "NETBSD"
958 # endif
959 # ifdef THREE86BSD
960 # define OS_TYPE "THREE86BSD"
961 # endif
962 # ifdef BSDI
963 # define OS_TYPE "BSDI"
964 # endif
965 # if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
966 || defined(THREE86BSD) || defined(BSDI)
967 # define HEURISTIC2
968 extern char etext;
969 # define DATASTART ((ptr_t)(&etext))
970 # endif
971 # ifdef NEXT
972 # define OS_TYPE "NEXT"
973 # define DATASTART ((ptr_t) get_etext())
974 # define STACKBOTTOM ((ptr_t)0xc0000000)
975 # define DATAEND /* not needed */
976 # endif
977 # ifdef DOS4GW
978 # define OS_TYPE "DOS4GW"
979 extern long __nullarea;
980 extern char _end;
981 extern char *_STACKTOP;
982 /* Depending on calling conventions Watcom C either precedes
983 or does not precedes with undescore names of C-variables.
984 Make sure startup code variables always have the same names. */
985 #pragma aux __nullarea "*";
986 #pragma aux _end "*";
987 # define STACKBOTTOM ((ptr_t) _STACKTOP)
988 /* confused? me too. */
989 # define DATASTART ((ptr_t) &__nullarea)
990 # define DATAEND ((ptr_t) &_end)
991 # endif
992 # ifdef GNU
993 # define OS_TYPE "GNU"
994 # endif
995 # endif
996
997 # ifdef NS32K
998 # define MACH_TYPE "NS32K"
999 # define ALIGNMENT 4
1000 extern char **environ;
1001 # define DATASTART ((ptr_t)(&environ))
1002 /* hideous kludge: environ is the first */
1003 /* word in crt0.o, and delimits the start */
1004 /* of the data segment, no matter which */
1005 /* ld options were passed through. */
1006 # define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
1007 # endif
1008
1009 # ifdef MIPS
1010 # define MACH_TYPE "MIPS"
1011 # ifdef LINUX
1012 # define CPP_WORDSZ _MIPS_SZPTR
1013 # define OS_TYPE "LINUX"
1014 # define ALIGNMENT 4
1015 # define ALIGN_DOUBLE
1016 extern int _fdata;
1017 # define DATASTART ((ptr_t)(&_fdata))
1018 extern int _end;
1019 # define DATAEND ((ptr_t)(&_end))
1020 # define STACKBOTTOM ((ptr_t)0x7fff8000)
1021 # define USE_GENERIC_PUSH_REGS 1
1022 # define DYNAMIC_LOADING
1023 # endif /* Linux */
1024 # ifdef ULTRIX
1025 # define HEURISTIC2
1026 # define DATASTART (ptr_t)0x10000000
1027 /* Could probably be slightly higher since */
1028 /* startup code allocates lots of stuff. */
1029 # define OS_TYPE "ULTRIX"
1030 # define ALIGNMENT 4
1031 # endif
1032 # ifdef RISCOS
1033 # define HEURISTIC2
1034 # define DATASTART (ptr_t)0x10000000
1035 # define OS_TYPE "RISCOS"
1036 # define ALIGNMENT 4 /* Required by hardware */
1037 # endif
1038 # ifdef IRIX5
1039 # define HEURISTIC2
1040 extern int _fdata;
1041 # define DATASTART ((ptr_t)(&_fdata))
1042 # ifdef USE_MMAP
1043 # define HEAP_START (ptr_t)0x30000000
1044 # else
1045 # define HEAP_START DATASTART
1046 # endif
1047 /* Lowest plausible heap address. */
1048 /* In the MMAP case, we map there. */
1049 /* In either case it is used to identify */
1050 /* heap sections so they're not */
1051 /* considered as roots. */
1052 # define OS_TYPE "IRIX5"
1053 # define MPROTECT_VDB
1054 # ifdef _MIPS_SZPTR
1055 # define CPP_WORDSZ _MIPS_SZPTR
1056 # define ALIGNMENT (_MIPS_SZPTR/8)
1057 # if CPP_WORDSZ != 64
1058 # define ALIGN_DOUBLE
1059 # endif
1060 # else
1061 # define ALIGNMENT 4
1062 # define ALIGN_DOUBLE
1063 # endif
1064 # define DYNAMIC_LOADING
1065 # endif
1066 # endif
1067
1068 # ifdef RS6000
1069 # define MACH_TYPE "RS6000"
1070 # define ALIGNMENT 4
1071 # define DATASTART ((ptr_t)0x20000000)
1072 extern int errno;
1073 # define STACKBOTTOM ((ptr_t)((ulong)&errno))
1074 # define DYNAMIC_LOADING
1075 /* For really old versions of AIX, this may have to be removed. */
1076 # endif
1077
1078 # ifdef HP_PA
1079 /* OS is assumed to be HP/UX */
1080 # define MACH_TYPE "HP_PA"
1081 # define OS_TYPE "HPUX"
1082 # ifdef __LP64__
1083 # define CPP_WORDSZ 64
1084 # define ALIGNMENT 8
1085 # else
1086 # define CPP_WORDSZ 32
1087 # define ALIGNMENT 4
1088 # define ALIGN_DOUBLE
1089 # endif
1090 extern int __data_start;
1091 # define DATASTART ((ptr_t)(&__data_start))
1092 # if 0
1093 /* The following appears to work for 7xx systems running HP/UX */
1094 /* 9.xx Furthermore, it might result in much faster */
1095 /* collections than HEURISTIC2, which may involve scanning */
1096 /* segments that directly precede the stack. It is not the */
1097 /* default, since it may not work on older machine/OS */
1098 /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1099 /* this.) */
1100 # define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1101 # else
1102 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1103 /* to this. We'll probably do this on other platforms, too. */
1104 /* For now I'll use it where I can test it. */
1105 extern char ** environ;
1106 # define STACKBOTTOM ((ptr_t)environ)
1107 # endif
1108 # ifndef SCM_STACK_GROWS_UP /* don't fight with scmconfig.h */
1109 # define SCM_STACK_GROWS_UP 1
1110 # endif
1111 # define DYNAMIC_LOADING
1112 # ifndef HPUX_THREADS
1113 # define MPROTECT_VDB
1114 # endif
1115 # include <unistd.h>
1116 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1117 # endif
1118
1119 # ifdef ALPHA
1120 # define MACH_TYPE "ALPHA"
1121 # define ALIGNMENT 8
1122 # define USE_GENERIC_PUSH_REGS
1123 /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1124 /* fp registers in some cases when the target is a 21264. The assembly */
1125 /* code doesn't handle that yet, and version dependencies make that a */
1126 /* bit tricky. Do the easy thing for now. */
1127 # ifdef OSF1
1128 # define OS_TYPE "OSF1"
1129 # define DATASTART ((ptr_t) 0x140000000)
1130 extern _end;
1131 # define DATAEND ((ptr_t) &_end)
1132 # define HEURISTIC2
1133 /* Normally HEURISTIC2 is too conervative, since */
1134 /* the text segment immediately follows the stack. */
1135 /* Hence we give an upper pound. */
1136 extern int __start;
1137 # define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
1138 # define CPP_WORDSZ 64
1139 # define MPROTECT_VDB
1140 # define DYNAMIC_LOADING
1141 # endif
1142 # ifdef LINUX
1143 # define OS_TYPE "LINUX"
1144 # define CPP_WORDSZ 64
1145 # define STACKBOTTOM ((ptr_t) 0x120000000)
1146 # ifdef __ELF__
1147 # define LINUX_DATA_START
1148 # define DYNAMIC_LOADING
1149 /* This doesn't work if the collector is in a dynamic library. */
1150 # else
1151 # define DATASTART ((ptr_t) 0x140000000)
1152 # endif
1153 extern int _end;
1154 # define DATAEND (&_end)
1155 # define MPROTECT_VDB
1156 /* Has only been superficially tested. May not */
1157 /* work on all versions. */
1158 # endif
1159 # endif
1160
1161 # ifdef IA64
1162 # define MACH_TYPE "IA64"
1163 # define ALIGN_DOUBLE
1164 /* Requires 16 byte alignment for malloc */
1165 # define ALIGNMENT 8
1166 # define USE_GENERIC_PUSH_REGS
1167 /* We need to get preserved registers in addition to register windows. */
1168 /* That's easiest to do with setjmp. */
1169 # ifdef HPUX
1170 --> needs work
1171 # endif
1172 # ifdef LINUX
1173 # define OS_TYPE "LINUX"
1174 # define CPP_WORDSZ 64
1175 /* This should really be done through /proc, but that */
1176 /* requires we run on an IA64 kernel. */
1177 # define STACKBOTTOM ((ptr_t) 0xa000000000000000l)
1178 /* We also need the base address of the register stack */
1179 /* backing store. There is probably a better way to */
1180 /* get that, too ... */
1181 # define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l)
1182 # if 1
1183 # define SEARCH_FOR_DATA_START
1184 # define DATASTART GC_data_start
1185 # else
1186 extern int data_start;
1187 # define DATASTART ((ptr_t)(&data_start))
1188 # endif
1189 # define DYNAMIC_LOADING
1190 # define MPROTECT_VDB
1191 /* Requires Linux 2.3.47 or later. */
1192 extern int _end;
1193 # define DATAEND (&_end)
1194 # define PREFETCH(x) \
1195 __asm__ (" lfetch [%0]": : "r"((void *)(x)))
1196 # define PREFETCH_FOR_WRITE(x) \
1197 __asm__ (" lfetch.excl [%0]": : "r"((void *)(x)))
1198 # define CLEAR_DOUBLE(x) \
1199 __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1200 # endif
1201 # endif
1202
1203 # ifdef M88K
1204 # define MACH_TYPE "M88K"
1205 # define ALIGNMENT 4
1206 # define ALIGN_DOUBLE
1207 extern int etext;
1208 # ifdef CX_UX
1209 # define OS_TYPE "CX_UX"
1210 # define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1211 # endif
1212 # ifdef DGUX
1213 # define OS_TYPE "DGUX"
1214 extern char * GC_SysVGetDataStart();
1215 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
1216 # endif
1217 # define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1218 # endif
1219
1220 # ifdef S370
1221 # define MACH_TYPE "S370"
1222 # define OS_TYPE "UTS4"
1223 # define ALIGNMENT 4 /* Required by hardware */
1224 extern int etext;
1225 extern int _etext;
1226 extern int _end;
1227 extern char * GC_SysVGetDataStart();
1228 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
1229 # define DATAEND (&_end)
1230 # define HEURISTIC2
1231 # endif
1232
1233 # if defined(PJ)
1234 # define ALIGNMENT 4
1235 extern int _etext;
1236 # define DATASTART ((ptr_t)(&_etext))
1237 # define HEURISTIC1
1238 # endif
1239
1240 # ifdef ARM32
1241 # define CPP_WORDSZ 32
1242 # define MACH_TYPE "ARM32"
1243 # define ALIGNMENT 4
1244 # ifdef NETBSD
1245 # define OS_TYPE "NETBSD"
1246 # define HEURISTIC2
1247 extern char etext;
1248 # define DATASTART ((ptr_t)(&etext))
1249 # define USE_GENERIC_PUSH_REGS
1250 # endif
1251 # ifdef LINUX
1252 # define OS_TYPE "LINUX"
1253 # define HEURISTIC1
1254 # undef STACK_GRAN
1255 # define STACK_GRAN 0x10000000
1256 # define USE_GENERIC_PUSH_REGS
1257 # ifdef __ELF__
1258 # define DYNAMIC_LOADING
1259 # include <features.h>
1260 # if defined(__GLIBC__) && __GLIBC__ >= 2
1261 # define LINUX_DATA_START
1262 # else
1263 extern char **__environ;
1264 # define DATASTART ((ptr_t)(&__environ))
1265 /* hideous kludge: __environ is the first */
1266 /* word in crt0.o, and delimits the start */
1267 /* of the data segment, no matter which */
1268 /* ld options were passed through. */
1269 /* We could use _etext instead, but that */
1270 /* would include .rodata, which may */
1271 /* contain large read-only data tables */
1272 /* that we'd rather not scan. */
1273 # endif
1274 extern int _end;
1275 # define DATAEND (&_end)
1276 # else
1277 extern int etext;
1278 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
1279 # endif
1280 # endif
1281 #endif
1282
1283 #ifdef LINUX_DATA_START
1284 /* Some Linux distributions arrange to define __data_start. Some */
1285 /* define data_start as a weak symbol. The latter is technically */
1286 /* broken, since the user program may define data_start, in which */
1287 /* case we lose. Nonetheless, we try both, prefering __data_start. */
1288 /* We assume gcc. */
1289 # pragma weak __data_start
1290 extern int __data_start;
1291 # pragma weak data_start
1292 extern int data_start;
1293 # define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
1294 #endif
1295
1296 # if SCM_STACK_GROWS_UP
1297 # define STACK_GROWS_DOWN 0
1298 # else
1299 # define STACK_GROWS_DOWN 1
1300 #endif
1301
1302 # ifndef CPP_WORDSZ
1303 # define CPP_WORDSZ 32
1304 # endif
1305
1306 # ifndef OS_TYPE
1307 # define OS_TYPE ""
1308 # endif
1309
1310 # ifndef DATAEND
1311 extern int end;
1312 # define DATAEND (&end)
1313 # endif
1314
1315 # if defined(SVR4) && !defined(GETPAGESIZE)
1316 # include <unistd.h>
1317 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1318 # endif
1319
1320 # ifndef GETPAGESIZE
1321 # if defined(SUNOS5) || defined(IRIX5)
1322 # include <unistd.h>
1323 # endif
1324 # define GETPAGESIZE() getpagesize()
1325 # endif
1326
1327 # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
1328 /* OS has SVR4 generic features. Probably others also qualify. */
1329 # define SVR4
1330 # endif
1331
1332 # if defined(SUNOS5) || defined(DRSNX)
1333 /* OS has SUNOS5 style semi-undocumented interface to dynamic */
1334 /* loader. */
1335 # define SUNOS5DL
1336 /* OS has SUNOS5 style signal handlers. */
1337 # define SUNOS5SIGS
1338 # endif
1339
1340 # if defined(HPUX)
1341 # define SUNOS5SIGS
1342 # endif
1343
1344 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
1345 -> bad word size
1346 # endif
1347
1348 # ifdef PCR
1349 # undef DYNAMIC_LOADING
1350 # undef STACKBOTTOM
1351 # undef HEURISTIC1
1352 # undef HEURISTIC2
1353 # undef PROC_VDB
1354 # undef MPROTECT_VDB
1355 # define PCR_VDB
1356 # endif
1357
1358 # ifdef SRC_M3
1359 /* Postponed for now. */
1360 # undef PROC_VDB
1361 # undef MPROTECT_VDB
1362 # endif
1363
1364 # ifdef SMALL_CONFIG
1365 /* Presumably not worth the space it takes. */
1366 # undef PROC_VDB
1367 # undef MPROTECT_VDB
1368 # endif
1369
1370 # ifdef USE_MUNMAP
1371 # undef MPROTECT_VDB /* Can't deal with address space holes. */
1372 # endif
1373
1374 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
1375 # define DEFAULT_VDB
1376 # endif
1377
1378 # ifndef PREFETCH
1379 # define PREFETCH(x)
1380 # define NO_PREFETCH
1381 # endif
1382
1383 # ifndef PREFETCH_FOR_WRITE
1384 # define PREFETCH_FOR_WRITE(x)
1385 # define NO_PREFETCH_FOR_WRITE
1386 # endif
1387
1388 # ifndef CACHE_LINE_SIZE
1389 # define CACHE_LINE_SIZE 32 /* Wild guess */
1390 # endif
1391
1392 # ifndef CLEAR_DOUBLE
1393 # define CLEAR_DOUBLE(x) \
1394 ((word*)x)[0] = 0; \
1395 ((word*)x)[1] = 0;
1396 # endif /* CLEAR_DOUBLE */
1397
1398 # if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
1399 # define SOLARIS_THREADS
1400 # endif
1401 # if defined(IRIX_THREADS) && !defined(IRIX5)
1402 --> inconsistent configuration
1403 # endif
1404 # if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
1405 --> inconsistent configuration
1406 # endif
1407 # if defined(LINUX_THREADS) && !defined(LINUX)
1408 --> inconsistent configuration
1409 # endif
1410 # if defined(SOLARIS_THREADS) && !defined(SUNOS5)
1411 --> inconsistent configuration
1412 # endif
1413 # if defined(HPUX_THREADS) && !defined(HPUX)
1414 --> inconsistent configuration
1415 # endif
1416 # if defined(PCR) || defined(SRC_M3) || \
1417 defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
1418 defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
1419 defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
1420 # define THREADS
1421 # endif
1422
1423 # if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
1424 || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
1425 /* Use setjmp based hack to mark from callee-save registers. */
1426 # define USE_GENERIC_PUSH_REGS
1427 # endif
1428 # if defined(SPARC) && !defined(LINUX)
1429 # define SAVE_CALL_CHAIN
1430 # define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
1431 /* include assembly code to do it well. */
1432 # endif
1433
1434 # if defined(LINUX) && !defined(POWERPC)
1435
1436 # if 0
1437 # include <linux/version.h>
1438 # if (LINUX_VERSION_CODE <= 0x10400)
1439 /* Ugly hack to get struct sigcontext_struct definition. Required */
1440 /* for some early 1.3.X releases. Will hopefully go away soon. */
1441 /* in some later Linux releases, asm/sigcontext.h may have to */
1442 /* be included instead. */
1443 # define __KERNEL__
1444 # include <asm/signal.h>
1445 # undef __KERNEL__
1446 # endif
1447
1448 # else
1449
1450 /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
1451 /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
1452 /* prototypes, so we have to include the top-level sigcontext.h to */
1453 /* make sure the former gets defined to be the latter if appropriate. */
1454 # include <features.h>
1455 # if 2 <= __GLIBC__
1456 # if 2 == __GLIBC__ && 0 == __GLIBC_MINOR__
1457 /* glibc 2.1 no longer has sigcontext.h. But signal.h */
1458 /* has the right declaration for glibc 2.1. */
1459 # include <sigcontext.h>
1460 # endif /* 0 == __GLIBC_MINOR__ */
1461 # else /* not 2 <= __GLIBC__ */
1462 /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
1463 /* one. Check LINUX_VERSION_CODE to see which we should reference. */
1464 # include <asm/sigcontext.h>
1465 # endif /* 2 <= __GLIBC__ */
1466 # endif
1467 # endif
1468 # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
1469 # include <sys/types.h>
1470 # if !defined(MSWIN32) && !defined(SUNOS4)
1471 # include <unistd.h>
1472 # endif
1473 # endif
1474
1475 # include <signal.h>
1476
1477 /* Blatantly OS dependent routines, except for those that are related */
1478 /* to dynamic loading. */
1479
1480 # if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
1481 # define NEED_FIND_LIMIT
1482 # endif
1483
1484 # if defined(IRIX_THREADS) || defined(HPUX_THREADS)
1485 # define NEED_FIND_LIMIT
1486 # endif
1487
1488 # if (defined(SUNOS4) && defined(DYNAMIC_LOADING)) && !defined(PCR)
1489 # define NEED_FIND_LIMIT
1490 # endif
1491
1492 # if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
1493 # define NEED_FIND_LIMIT
1494 # endif
1495
1496 # if defined(LINUX) && \
1497 (defined(POWERPC) || defined(SPARC) || defined(ALPHA) || defined(IA64) \
1498 || defined(MIPS))
1499 # define NEED_FIND_LIMIT
1500 # endif
1501
1502 #ifdef NEED_FIND_LIMIT
1503 # include <setjmp.h>
1504 #endif
1505
1506 #ifdef FREEBSD
1507 # include <machine/trap.h>
1508 #endif
1509
1510 #ifdef AMIGA
1511 # include <proto/exec.h>
1512 # include <proto/dos.h>
1513 # include <dos/dosextens.h>
1514 # include <workbench/startup.h>
1515 #endif
1516
1517 #ifdef MSWIN32
1518 # define WIN32_LEAN_AND_MEAN
1519 # define NOSERVICE
1520 # include <windows.h>
1521 #endif
1522
1523 #ifdef MACOS
1524 # include <Processes.h>
1525 #endif
1526
1527 #ifdef IRIX5
1528 # include <sys/uio.h>
1529 # include <malloc.h> /* for locking */
1530 #endif
1531 #ifdef USE_MMAP
1532 # include <sys/types.h>
1533 # include <sys/mman.h>
1534 # include <sys/stat.h>
1535 # include <fcntl.h>
1536 #endif
1537
1538 #ifdef SUNOS5SIGS
1539 # include <sys/siginfo.h>
1540 # undef setjmp
1541 # undef longjmp
1542 # define setjmp(env) sigsetjmp(env, 1)
1543 # define longjmp(env, val) siglongjmp(env, val)
1544 # define jmp_buf sigjmp_buf
1545 #endif
1546
1547 #ifdef DJGPP
1548 /* Apparently necessary for djgpp 2.01. May casuse problems with */
1549 /* other versions. */
1550 typedef long unsigned int caddr_t;
1551 #endif
1552
1553 #ifdef PCR
1554 # include "il/PCR_IL.h"
1555 # include "th/PCR_ThCtl.h"
1556 # include "mm/PCR_MM.h"
1557 #endif
1558
1559 #if !defined(NO_EXECUTE_PERMISSION)
1560 # define OPT_PROT_EXEC PROT_EXEC
1561 #else
1562 # define OPT_PROT_EXEC 0
1563 #endif
1564
1565 # ifdef OS2
1566
1567 # include <stddef.h>
1568
1569 # if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
1570
1571 # else /* IBM's compiler */
1572
1573 /* A kludge to get around what appears to be a header file bug */
1574 # ifndef WORD
1575 # define WORD unsigned short
1576 # endif
1577 # ifndef DWORD
1578 # define DWORD unsigned long
1579 # endif
1580
1581 # define EXE386 1
1582 # include <newexe.h>
1583 # include <exe386.h>
1584
1585 # endif /* __IBMC__ */
1586
1587 # define INCL_DOSEXCEPTIONS
1588 # define INCL_DOSPROCESS
1589 # define INCL_DOSERRORS
1590 # define INCL_DOSMODULEMGR
1591 # define INCL_DOSMEMMGR
1592 # include <os2.h>
1593
1594 # endif /*!OS/2 */
1595
1596 /*
1597 * Find the base of the stack.
1598 * Used only in single-threaded environment.
1599 * With threads, GC_mark_roots needs to know how to do this.
1600 * Called with allocator lock held.
1601 */
1602 # ifdef MSWIN32
1603 # define is_writable(prot) ((prot) == PAGE_READWRITE \
1604 || (prot) == PAGE_WRITECOPY \
1605 || (prot) == PAGE_EXECUTE_READWRITE \
1606 || (prot) == PAGE_EXECUTE_WRITECOPY)
1607 /* Return the number of bytes that are writable starting at p. */
1608 /* The pointer p is assumed to be page aligned. */
1609 /* If base is not 0, *base becomes the beginning of the */
1610 /* allocation region containing p. */
1611 static word GC_get_writable_length(ptr_t p, ptr_t *base)
1612 {
1613 MEMORY_BASIC_INFORMATION buf;
1614 word result;
1615 word protect;
1616
1617 result = VirtualQuery(p, &buf, sizeof(buf));
1618 if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
1619 if (base != 0) *base = (ptr_t)(buf.AllocationBase);
1620 protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
1621 if (!is_writable(protect)) {
1622 return(0);
1623 }
1624 if (buf.State != MEM_COMMIT) return(0);
1625 return(buf.RegionSize);
1626 }
1627
1628 void *scm_get_stack_base()
1629 {
1630 int dummy;
1631 ptr_t sp = (ptr_t)(&dummy);
1632 ptr_t trunc_sp;
1633 word size;
1634 static word GC_page_size = 0;
1635 if (!GC_page_size) {
1636 SYSTEM_INFO sysinfo;
1637 GetSystemInfo(&sysinfo);
1638 GC_page_size = sysinfo.dwPageSize;
1639 }
1640 trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
1641 size = GC_get_writable_length(trunc_sp, 0);
1642 return(trunc_sp + size);
1643 }
1644
1645
1646 # else
1647
1648 # ifdef OS2
1649
1650 void *scm_get_stack_base()
1651 {
1652 PTIB ptib;
1653 PPIB ppib;
1654
1655 if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
1656 GC_err_printf0("DosGetInfoBlocks failed\n");
1657 ABORT("DosGetInfoBlocks failed\n");
1658 }
1659 return((ptr_t)(ptib -> tib_pstacklimit));
1660 }
1661
1662 # else
1663
1664 # ifdef AMIGA
1665
1666 void *scm_get_stack_base()
1667 {
1668 struct Process *proc = (struct Process*)SysBase->ThisTask;
1669
1670 /* Reference: Amiga Guru Book Pages: 42,567,574 */
1671 if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS
1672 && proc->pr_CLI != NULL) {
1673 /* first ULONG is StackSize */
1674 /*longPtr = proc->pr_ReturnAddr;
1675 size = longPtr[0];*/
1676
1677 return (char *)proc->pr_ReturnAddr + sizeof(ULONG);
1678 } else {
1679 return (char *)proc->pr_Task.tc_SPUpper;
1680 }
1681 }
1682
1683 #if 0 /* old version */
1684 void *scm_get_stack_base()
1685 {
1686 extern struct WBStartup *_WBenchMsg;
1687 extern long __base;
1688 extern long __stack;
1689 struct Task *task;
1690 struct Process *proc;
1691 struct CommandLineInterface *cli;
1692 long size;
1693
1694 if ((task = FindTask(0)) == 0) {
1695 GC_err_puts("Cannot find own task structure\n");
1696 ABORT("task missing");
1697 }
1698 proc = (struct Process *)task;
1699 cli = BADDR(proc->pr_CLI);
1700
1701 if (_WBenchMsg != 0 || cli == 0) {
1702 size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
1703 } else {
1704 size = cli->cli_DefaultStack * 4;
1705 }
1706 return (ptr_t)(__base + GC_max(size, __stack));
1707 }
1708 #endif /* 0 */
1709
1710 # else /* !AMIGA, !OS2, ... */
1711
1712 # ifdef NEED_FIND_LIMIT
1713 /* Some tools to implement HEURISTIC2 */
1714 # define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
1715 /* static */ jmp_buf GC_jmp_buf;
1716
1717 /*ARGSUSED*/
1718 static void GC_fault_handler(sig)
1719 int sig;
1720 {
1721 longjmp(GC_jmp_buf, 1);
1722 }
1723
1724 # ifdef __STDC__
1725 typedef void (*handler)(int);
1726 # else
1727 typedef void (*handler)();
1728 # endif
1729
1730 # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1731 static struct sigaction old_segv_act;
1732 # if defined(_sigargs) || defined(HPUX) /* !Irix6.x */
1733 static struct sigaction old_bus_act;
1734 # endif
1735 # else
1736 static handler old_segv_handler, old_bus_handler;
1737 # endif
1738
1739 static void GC_setup_temporary_fault_handler()
1740 {
1741 # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1742 struct sigaction act;
1743
1744 act.sa_handler = GC_fault_handler;
1745 act.sa_flags = SA_RESTART | SA_NODEFER;
1746 /* The presence of SA_NODEFER represents yet another gross */
1747 /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
1748 /* interact correctly with -lthread. We hide the confusion */
1749 /* by making sure that signal handling doesn't affect the */
1750 /* signal mask. */
1751
1752 (void) sigemptyset(&act.sa_mask);
1753 # ifdef IRIX_THREADS
1754 /* Older versions have a bug related to retrieving and */
1755 /* and setting a handler at the same time. */
1756 (void) sigaction(SIGSEGV, 0, &old_segv_act);
1757 (void) sigaction(SIGSEGV, &act, 0);
1758 # else
1759 (void) sigaction(SIGSEGV, &act, &old_segv_act);
1760 # if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1761 || defined(HPUX)
1762 /* Under Irix 5.x or HP/UX, we may get SIGBUS. */
1763 /* Pthreads doesn't exist under Irix 5.x, so we */
1764 /* don't have to worry in the threads case. */
1765 (void) sigaction(SIGBUS, &act, &old_bus_act);
1766 # endif
1767 # endif /* IRIX_THREADS */
1768 # else
1769 old_segv_handler = signal(SIGSEGV, GC_fault_handler);
1770 # ifdef SIGBUS
1771 old_bus_handler = signal(SIGBUS, GC_fault_handler);
1772 # endif
1773 # endif
1774 }
1775
1776 static void GC_reset_fault_handler()
1777 {
1778 # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1779 (void) sigaction(SIGSEGV, &old_segv_act, 0);
1780 # if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1781 || defined(HPUX)
1782 (void) sigaction(SIGBUS, &old_bus_act, 0);
1783 # endif
1784 # else
1785 (void) signal(SIGSEGV, old_segv_handler);
1786 # ifdef SIGBUS
1787 (void) signal(SIGBUS, old_bus_handler);
1788 # endif
1789 # endif
1790 }
1791
1792 /* Single argument version, robust against whole program analysis. */
1793 static void
1794 GC_noop1(x)
1795 word x;
1796 {
1797 static VOLATILE word sink;
1798 sink = x;
1799 }
1800
1801 /* Return the first nonaddressible location > p (up) or */
1802 /* the smallest location q s.t. [q,p] is addressible (!up). */
1803 static ptr_t GC_find_limit(p, up)
1804 ptr_t p;
1805 GC_bool up;
1806 {
1807 static VOLATILE ptr_t result;
1808 /* Needs to be static, since otherwise it may not be */
1809 /* preserved across the longjmp. Can safely be */
1810 /* static since it's only called once, with the */
1811 /* allocation lock held. */
1812
1813
1814 GC_setup_temporary_fault_handler();
1815 if (setjmp(GC_jmp_buf) == 0) {
1816 result = (ptr_t)(((word)(p))
1817 & ~(MIN_PAGE_SIZE-1));
1818 for (;;) {
1819 if (up) {
1820 result += MIN_PAGE_SIZE;
1821 } else {
1822 result -= MIN_PAGE_SIZE;
1823 }
1824 GC_noop1((word)(*result));
1825 }
1826 }
1827 GC_reset_fault_handler();
1828 if (!up) {
1829 result += MIN_PAGE_SIZE;
1830 }
1831 return(result);
1832 }
1833
1834 # endif
1835
1836 #ifdef LINUX_STACKBOTTOM
1837
1838 #include <sys/types.h>
1839 #include <sys/stat.h>
1840 #include <fcntl.h>
1841
1842 # define STAT_SKIP 27 /* Number of fields preceding startstack */
1843 /* field in /proc/self/stat */
1844
1845 static ptr_t GC_linux_stack_base(void)
1846 {
1847 /* We read the stack base value from /proc/self/stat. We do this */
1848 /* using direct I/O system calls in order to avoid calling malloc */
1849 /* in case REDIRECT_MALLOC is defined. */
1850 # define STAT_BUF_SIZE 4096
1851 # ifdef USE_LD_WRAP
1852 # define STAT_READ __real_read
1853 # else
1854 # define STAT_READ read
1855 # endif
1856 char stat_buf[STAT_BUF_SIZE];
1857 int f;
1858 char c;
1859 word result = 0;
1860 size_t i, buf_offset = 0;
1861
1862 f = open("/proc/self/stat", O_RDONLY);
1863 if (f < 0 || STAT_READ(f, stat_buf, STAT_BUF_SIZE) < 2 * STAT_SKIP) {
1864 ABORT("Couldn't read /proc/self/stat");
1865 }
1866 c = stat_buf[buf_offset++];
1867 /* Skip the required number of fields. This number is hopefully */
1868 /* constant across all Linux implementations. */
1869 for (i = 0; i < STAT_SKIP; ++i) {
1870 while (isspace(c)) c = stat_buf[buf_offset++];
1871 while (!isspace(c)) c = stat_buf[buf_offset++];
1872 }
1873 while (isspace(c)) c = stat_buf[buf_offset++];
1874 while (isdigit(c)) {
1875 result *= 10;
1876 result += c - '0';
1877 c = stat_buf[buf_offset++];
1878 }
1879 close(f);
1880 if (result < 0x10000000) ABORT("Absurd stack bottom value");
1881 return (ptr_t)result;
1882 }
1883
1884 #endif /* LINUX_STACKBOTTOM */
1885
1886 void *scm_get_stack_base()
1887 {
1888 word dummy;
1889 void *result;
1890
1891 result = &dummy; /* initialize to silence compiler */
1892
1893 # define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
1894
1895 # ifdef STACKBOTTOM
1896 return(STACKBOTTOM);
1897 # else
1898 # ifdef HEURISTIC1
1899 # if STACK_GROWS_DOWN
1900 result = (ptr_t)((((word)(&dummy))
1901 + STACKBOTTOM_ALIGNMENT_M1)
1902 & ~STACKBOTTOM_ALIGNMENT_M1);
1903 # else
1904 result = (ptr_t)(((word)(&dummy))
1905 & ~STACKBOTTOM_ALIGNMENT_M1);
1906 # endif
1907 # endif /* HEURISTIC1 */
1908 # ifdef LINUX_STACKBOTTOM
1909 result = GC_linux_stack_base();
1910 # endif
1911 # ifdef HEURISTIC2
1912 # if STACK_GROWS_DOWN
1913 result = GC_find_limit((ptr_t)(&dummy), TRUE);
1914 # ifdef HEURISTIC2_LIMIT
1915 if (result > HEURISTIC2_LIMIT
1916 && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
1917 result = HEURISTIC2_LIMIT;
1918 }
1919 # endif
1920 # else
1921 result = GC_find_limit((ptr_t)(&dummy), FALSE);
1922 # ifdef HEURISTIC2_LIMIT
1923 if (result < HEURISTIC2_LIMIT
1924 && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
1925 result = HEURISTIC2_LIMIT;
1926 }
1927 # endif
1928 # endif
1929
1930 # endif /* HEURISTIC2 */
1931 # if STACK_GROWS_DOWN
1932 if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
1933 # endif
1934 return(result);
1935 # endif /* STACKBOTTOM */
1936 }
1937
1938 # endif /* ! AMIGA */
1939 # endif /* ! OS2 */
1940 # endif /* ! MSWIN32 */
1941
1942 #endif /* mach_type_known */
1943 #endif /* ! HAVE_LIBC_STACK_END */
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