1 /*
2 * Copyright 1988, 1989, 2010 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 #ifdef 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 *
scm_get_stack_base()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(__FreeBSD__) && defined(__sparc__)
119 # define SPARC
120 # define FREEBSD
121 # include <machine/frame.h>
122 # define mach_type_known
123 # endif
124 # if defined(__NetBSD__) && defined(__powerpc__)
125 # define POWERPC
126 # define NETBSD
127 # define mach_type_known
128 # endif
129 /* in netbsd 2.0 only __m68k__ is defined, not m68k */
130 # if defined(__NetBSD__) && (defined(m68k) || defined(__m68k__))
131 # define M68K
132 # define NETBSD
133 # define mach_type_known
134 # endif
135 /* in netbsd 2.0 only __arm__ is defined, not arm32 */
136 # if defined(__NetBSD__) && (defined(arm32) || defined(__arm__))
137 # define ARM32
138 # define NETBSD
139 # define mach_type_known
140 # endif
141 # if defined(__NetBSD__) && defined(__sparc__)
142 # define SPARC
143 # define NETBSD
144 # define mach_type_known
145 # endif
146 # if defined(vax)
147 # define VAX
148 # ifdef ultrix
149 # define ULTRIX
150 # else
151 # define BSD
152 # endif
153 # define mach_type_known
154 # endif
155 # if defined(mips) || defined(__mips)
156 # define MIPS
157 # if !defined(LINUX)
158 # if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)
159 # define ULTRIX
160 # else
161 # if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \
162 || defined(__SYSTYPE_SVR4__)
163 # define IRIX5 /* or IRIX 6.X */
164 # else
165 # define RISCOS /* or IRIX 4.X */
166 # endif
167 # endif
168 # endif /* !LINUX */
169 # define mach_type_known
170 # endif
171 # if defined(sequent) && defined(i386)
172 # define I386
173 # define SEQUENT
174 # define mach_type_known
175 # endif
176 # if defined(sun) && defined(i386)
177 # define I386
178 # define SUNOS5
179 # define mach_type_known
180 # endif
181 # if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
182 # define I386
183 # define OS2
184 # define mach_type_known
185 # endif
186 # if defined(ibm032)
187 # define RT
188 # define mach_type_known
189 # endif
190 # if defined(sun) && (defined(sparc) || defined(__sparc))
191 # define SPARC
192 /* Test for SunOS 5.x */
193 # include <errno.h>
194 # ifdef ECHRNG
195 # define SUNOS5
196 # else
197 # define SUNOS4
198 # endif
199 # define mach_type_known
200 # endif
201 # if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
202 && !defined(__OpenBSD__)
203 # define SPARC
204 # define DRSNX
205 # define mach_type_known
206 # endif
207 # if defined(_IBMR2)
208 # define RS6000
209 # define mach_type_known
210 # endif
211 # if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
212 /* The above test may need refinement */
213 # define I386
214 # if defined(_SCO_ELF)
215 # define SCO_ELF
216 # else
217 # define SCO
218 # endif
219 # define mach_type_known
220 # endif
221 # if defined(_AUX_SOURCE)
222 # define M68K
223 # define SYSV
224 # define mach_type_known
225 # endif
226 # if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
227 || defined(hppa) || defined(__hppa__)
228 # define HP_PA
229 # ifndef LINUX
230 # define HPUX
231 # endif
232 # define mach_type_known
233 # endif
234 # if defined(LINUX) && (defined(i386) || defined(__i386__))
235 # define I386
236 # define mach_type_known
237 # endif
238 # if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
239 # define IA64
240 # define mach_type_known
241 # endif
242 # if defined(LINUX) && defined(powerpc)
243 # define POWERPC
244 # define mach_type_known
245 # endif
246 # if defined(LINUX) && defined(__mc68000__)
247 # define M68K
248 # define mach_type_known
249 # endif
250 # if defined(LINUX) && (defined(sparc) || defined(__sparc__))
251 # define SPARC
252 # define mach_type_known
253 # endif
254 # if defined(LINUX) && (defined(arm) || defined (__arm__))
255 # define ARM32
256 # define mach_type_known
257 # endif
258 # if defined(__FreeBSD__) && defined(__ia64__)
259 # define FREEBSD
260 # define IA64
261 # define mach_type_known
262 # endif
263 # if defined(__FreeBSD__) && defined(__amd64__)
264 # define FREEBSD
265 # define AMD64
266 # define mach_type_known
267 # endif
268 # if defined(__FreeBSD__) && defined(__alpha__)
269 # define FREEBSD
270 # define ALPHA
271 # define mach_type_known
272 # elif defined(__alpha) || defined(__alpha__)
273 # define ALPHA
274 # if !defined(LINUX) && !defined (NETBSD)
275 # define OSF1 /* a.k.a Digital Unix */
276 # endif
277 # define mach_type_known
278 # endif
279 # if defined(_AMIGA) && !defined(AMIGA)
280 # define AMIGA
281 # endif
282 # ifdef AMIGA
283 # define M68K
284 # define mach_type_known
285 # endif
286 # if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
287 # define M68K
288 # define MACOS
289 # define mach_type_known
290 # endif
291 # if defined(__MWERKS__) && defined(__powerc)
292 # define POWERPC
293 # define MACOS
294 # define mach_type_known
295 # endif
296 # if defined(macosx) || \
297 (defined(__APPLE__) && defined(__MACH__) && defined(__ppc__))
298 # define MACOSX
299 # define POWERPC
300 # define mach_type_known
301 # endif
302 # if defined(NeXT) && defined(mc68000)
303 # define M68K
304 # define NEXT
305 # define mach_type_known
306 # endif
307 # if defined(NeXT) && defined(i386)
308 # define I386
309 # define NEXT
310 # define mach_type_known
311 # endif
312 # if defined(__OpenBSD__) && (defined(i386) || defined(__i386__))
313 # define I386
314 # define OPENBSD
315 # define mach_type_known
316 # endif
317 # if defined(__FreeBSD__) && defined(i386)
318 # define I386
319 # define FREEBSD
320 # define mach_type_known
321 # endif
322 # if defined(__NetBSD__) && defined(i386)
323 # define I386
324 # define NETBSD
325 # define mach_type_known
326 # endif
327 # if defined(bsdi) && defined(i386)
328 # define I386
329 # define BSDI
330 # define mach_type_known
331 # endif
332 # if !defined(mach_type_known) && defined(__386BSD__)
333 # define I386
334 # define THREE86BSD
335 # define mach_type_known
336 # endif
337 # if defined(_CX_UX) && defined(_M88K)
338 # define M88K
339 # define CX_UX
340 # define mach_type_known
341 # endif
342 # if defined(DGUX)
343 # define M88K
344 /* DGUX defined */
345 # define mach_type_known
346 # endif
347 # if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
348 || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
349 # define I386
350 # define MSWIN32 /* or Win32s */
351 # define mach_type_known
352 # endif
353 # if defined(__DJGPP__)
354 # define I386
355 # ifndef DJGPP
356 # define DJGPP /* MSDOS running the DJGPP port of GCC */
357 # endif
358 # define mach_type_known
359 # endif
360 # if defined(__CYGWIN32__) || defined(__CYGWIN__)
361 # define I386
362 # define CYGWIN32
363 # define mach_type_known
364 # endif
365 # if defined(__MINGW32__)
366 # define I386
367 # define MSWIN32
368 # define mach_type_known
369 # endif
370 # if defined(__BORLANDC__)
371 # define I386
372 # define MSWIN32
373 # define mach_type_known
374 # endif
375 # if defined(_UTS) && !defined(mach_type_known)
376 # define S370
377 # define UTS4
378 # define mach_type_known
379 # endif
380 # if defined(__pj__)
381 # define PJ
382 # define mach_type_known
383 # endif
384 /* Ivan Demakov */
385 # if defined(__WATCOMC__) && defined(__386__)
386 # define I386
387 # if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
388 # if defined(__OS2__)
389 # define OS2
390 # else
391 # if defined(__WINDOWS_386__) || defined(__NT__)
392 # define MSWIN32
393 # else
394 # define DOS4GW
395 # endif
396 # endif
397 # endif
398 # define mach_type_known
399 # endif
400 # if defined(__s390__) && defined(LINUX)
401 # define S370
402 # define mach_type_known
403 # endif
404 # if defined(__GNU__)
405 # define I386
406 # define GNU
407 # define mach_type_known
408 # endif
409 # if defined(__SCO_VERSION__)
410 # define I386
411 # define SYSV
412 # define mach_type_known
413 # endif
414
415 /* Feel free to add more clauses here */
416
417 /* Or manually define the machine type here. A machine type is */
418 /* characterized by the architecture. Some */
419 /* machine types are further subdivided by OS. */
420 /* the macros ULTRIX, RISCOS, and BSD to distinguish. */
421 /* Note that SGI IRIX is treated identically to RISCOS. */
422 /* SYSV on an M68K actually means A/UX. */
423 /* The distinction in these cases is usually the stack starting address */
424 # ifndef mach_type_known
425
426 void *
scm_get_stack_base()427 scm_get_stack_base ()
428 {
429 ABORT ("Can't determine stack base");
430 return NULL;
431 }
432
433 # else
434 /* Mapping is: M68K ==> Motorola 680X0 */
435 /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
436 /* MACOS and AMIGA variants) */
437 /* I386 ==> Intel 386 */
438 /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
439 /* FREEBSD, THREE86BSD, MSWIN32, */
440 /* BSDI,SUNOS5, NEXT, other variants) */
441 /* NS32K ==> Encore Multimax */
442 /* MIPS ==> R2000 or R3000 */
443 /* (RISCOS, ULTRIX variants) */
444 /* VAX ==> DEC VAX */
445 /* (BSD, ULTRIX variants) */
446 /* RS6000 ==> IBM RS/6000 AIX3.X */
447 /* RT ==> IBM PC/RT */
448 /* HP_PA ==> HP9000/700 & /800 */
449 /* HP/UX */
450 /* SPARC ==> SPARC under SunOS */
451 /* (SUNOS4, SUNOS5, */
452 /* DRSNX variants) */
453 /* ALPHA ==> DEC Alpha */
454 /* (OSF1 and LINUX variants) */
455 /* M88K ==> Motorola 88XX0 */
456 /* (CX_UX and DGUX) */
457 /* S370 ==> 370-like machine */
458 /* running Amdahl UTS4 */
459 /* ARM32 ==> Intel StrongARM */
460 /* IA64 ==> Intel IA64 */
461 /* (e.g. Itanium) */
462
463
464 /*
465 * For each architecture and OS, the following need to be defined:
466 *
467 * CPP_WORD_SZ is a simple integer constant representing the word size.
468 * in bits. We assume byte addressibility, where a byte has 8 bits.
469 * We also assume CPP_WORD_SZ is either 32 or 64.
470 * (We care about the length of pointers, not hardware
471 * bus widths. Thus a 64 bit processor with a C compiler that uses
472 * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
473 *
474 * MACH_TYPE is a string representation of the machine type.
475 * OS_TYPE is analogous for the OS.
476 *
477 * ALIGNMENT is the largest N, such that
478 * all pointer are guaranteed to be aligned on N byte boundaries.
479 * defining it to be 1 will always work, but perform poorly.
480 *
481 * DATASTART is the beginning of the data segment.
482 * On UNIX systems, the collector will scan the area between DATASTART
483 * and DATAEND for root pointers.
484 *
485 * DATAEND, if not &end.
486 *
487 * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
488 * the pointer size.
489 *
490 * STACKBOTTOM is the cool end of the stack, which is usually the
491 * highest address in the stack.
492 * Under PCR or OS/2, we have other ways of finding thread stacks.
493 * For each machine, the following should:
494 * 1) define SCM_STACK_GROWS_UP if the stack grows toward higher addresses, and
495 * 2) define exactly one of
496 * STACKBOTTOM (should be defined to be an expression)
497 * HEURISTIC1
498 * HEURISTIC2
499 * If either of the last two macros are defined, then STACKBOTTOM is computed
500 * during collector startup using one of the following two heuristics:
501 * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
502 * the next multiple of STACK_GRAN.
503 * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
504 * in small steps (decrement if SCM_STACK_GROWS_UP), and read the value
505 * at each location. Remember the value when the first
506 * Segmentation violation or Bus error is signalled. Round that
507 * to the nearest plausible page boundary, and use that instead
508 * of STACKBOTTOM.
509 *
510 * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
511 * the value of environ is a pointer that can serve as STACKBOTTOM.
512 * I expect that HEURISTIC2 can be replaced by this approach, which
513 * interferes far less with debugging.
514 *
515 * If no expression for STACKBOTTOM can be found, and neither of the above
516 * heuristics are usable, the collector can still be used with all of the above
517 * undefined, provided one of the following is done:
518 * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
519 * without reference to STACKBOTTOM. This is appropriate for use in
520 * conjunction with thread packages, since there will be multiple stacks.
521 * (Allocating thread stacks in the heap, and treating them as ordinary
522 * heap data objects is also possible as a last resort. However, this is
523 * likely to introduce significant amounts of excess storage retention
524 * unless the dead parts of the thread stacks are periodically cleared.)
525 * 2) Client code may set GC_stackbottom before calling any GC_ routines.
526 * If the author of the client code controls the main program, this is
527 * easily accomplished by introducing a new main program, setting
528 * GC_stackbottom to the address of a local variable, and then calling
529 * the original main program. The new main program would read something
530 * like:
531 *
532 * # include "gc_private.h"
533 *
534 * main(argc, argv, envp)
535 * int argc;
536 * char **argv, **envp;
537 * {
538 * int dummy;
539 *
540 * GC_stackbottom = (ptr_t)(&dummy);
541 * return(real_main(argc, argv, envp));
542 * }
543 *
544 *
545 * Each architecture may also define the style of virtual dirty bit
546 * implementation to be used:
547 * MPROTECT_VDB: Write protect the heap and catch faults.
548 * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
549 *
550 * An architecture may define DYNAMIC_LOADING if dynamic_load.c
551 * defined GC_register_dynamic_libraries() for the architecture.
552 *
553 * An architecture may define PREFETCH(x) to preload the cache with *x.
554 * This defaults to a no-op.
555 *
556 * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
557 *
558 * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
559 * clear the two words at GC_malloc-aligned address x. By default,
560 * word stores of 0 are used instead.
561 */
562
563
564 # define STACK_GRAN 0x1000000
565 # ifdef M68K
566 # define MACH_TYPE "M68K"
567 # define ALIGNMENT 2
568 # ifdef OPENBSD
569 # define OS_TYPE "OPENBSD"
570 # define HEURISTIC2
571 extern char etext;
572 # define DATASTART ((ptr_t)(&etext))
573 # endif
574 # ifdef NETBSD
575 # define OS_TYPE "NETBSD"
576 # define HEURISTIC2
577 extern char etext;
578 # define DATASTART ((ptr_t)(&etext))
579 # endif
580 # ifdef LINUX
581 # define OS_TYPE "LINUX"
582 # define STACKBOTTOM ((ptr_t)0xf0000000)
583 # define MPROTECT_VDB
584 # ifdef __ELF__
585 # define DYNAMIC_LOADING
586 extern char **__environ;
587 # define DATASTART ((ptr_t)(&__environ))
588 /* hideous kludge: __environ is the first */
589 /* word in crt0.o, and delimits the start */
590 /* of the data segment, no matter which */
591 /* ld options were passed through. */
592 /* We could use _etext instead, but that */
593 /* would include .rodata, which may */
594 /* contain large read-only data tables */
595 /* that we'd rather not scan. */
596 extern int _end;
597 # define DATAEND (&_end)
598 # else
599 extern int etext;
600 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
601 # endif
602 # endif
603 # ifdef SUNOS4
604 # define OS_TYPE "SUNOS4"
605 extern char etext;
606 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
607 # define HEURISTIC1 /* differs */
608 # define DYNAMIC_LOADING
609 # endif
610 # ifdef HP
611 # define OS_TYPE "HP"
612 extern char etext;
613 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
614 # define STACKBOTTOM ((ptr_t) 0xffeffffc)
615 /* empirically determined. seems to work. */
616 # include <unistd.h>
617 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
618 # endif
619 # ifdef SYSV
620 # define OS_TYPE "SYSV"
621 extern etext;
622 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
623 & ~0x3fffff) \
624 +((word)&etext & 0x1fff))
625 /* This only works for shared-text binaries with magic number 0413.
626 The other sorts of SysV binaries put the data at the end of the text,
627 in which case the default of &etext would work. Unfortunately,
628 handling both would require having the magic-number available.
629 -- Parag
630 */
631 # define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
632 /* The stack starts at the top of memory, but */
633 /* 0x0 cannot be used as setjump_test complains */
634 /* that the stack direction is incorrect. Two */
635 /* bytes down from 0x0 should be safe enough. */
636 /* --Parag */
637 # include <sys/mmu.h>
638 # define GETPAGESIZE() PAGESIZE /* Is this still right? */
639 # endif
640 # ifdef AMIGA
641 # define OS_TYPE "AMIGA"
642 /* STACKBOTTOM and DATASTART handled specially */
643 /* in os_dep.c */
644 # define DATAEND /* not needed */
645 # define GETPAGESIZE() 4096
646 # endif
647 # ifdef MACOS
648 # ifndef __LOWMEM__
649 # include <LowMem.h>
650 # endif
651 # define OS_TYPE "MACOS"
652 /* see os_dep.c for details of global data segments. */
653 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
654 # define DATAEND /* not needed */
655 # define GETPAGESIZE() 4096
656 # endif
657 # ifdef NEXT
658 # define OS_TYPE "NEXT"
659 # define DATASTART ((ptr_t) get_etext())
660 # define STACKBOTTOM ((ptr_t) 0x4000000)
661 # define DATAEND /* not needed */
662 # endif
663 # endif
664
665 # ifdef POWERPC
666 # define MACH_TYPE "POWERPC"
667 # ifdef MACOS
668 # define ALIGNMENT 2 /* Still necessary? Could it be 4? */
669 # ifndef __LOWMEM__
670 # include <LowMem.h>
671 # endif
672 # define OS_TYPE "MACOS"
673 /* see os_dep.c for details of global data segments. */
674 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
675 # define DATAEND /* not needed */
676 # endif
677 # ifdef LINUX
678 # define ALIGNMENT 4 /* Guess. Can someone verify? */
679 /* This was 2, but that didn't sound right. */
680 # define OS_TYPE "LINUX"
681 # define HEURISTIC1
682 # define DYNAMIC_LOADING
683 # undef STACK_GRAN
684 # define STACK_GRAN 0x10000000
685 /* Stack usually starts at 0x80000000 */
686 # define LINUX_DATA_START
687 extern int _end;
688 # define DATAEND (&_end)
689 # endif
690 # ifdef MACOSX
691 # define ALIGNMENT 4
692 # define OS_TYPE "MACOSX"
693 # define DATASTART ((ptr_t) get_etext())
694 # define STACKBOTTOM ((ptr_t) 0xc0000000)
695 # define DATAEND /* not needed */
696 # endif
697 # endif
698
699 # ifdef VAX
700 # define MACH_TYPE "VAX"
701 # define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
702 extern char etext;
703 # define DATASTART ((ptr_t)(&etext))
704 # ifdef BSD
705 # define OS_TYPE "BSD"
706 # define HEURISTIC1
707 /* HEURISTIC2 may be OK, but it's hard to test. */
708 # endif
709 # ifdef ULTRIX
710 # define OS_TYPE "ULTRIX"
711 # define STACKBOTTOM ((ptr_t) 0x7fffc800)
712 # endif
713 # endif
714
715 # ifdef RT
716 # define MACH_TYPE "RT"
717 # define ALIGNMENT 4
718 # define DATASTART ((ptr_t) 0x10000000)
719 # define STACKBOTTOM ((ptr_t) 0x1fffd800)
720 # endif
721
722 # ifdef SPARC
723 # define MACH_TYPE "SPARC"
724 extern int etext;
725 # ifdef SUNOS5
726 # define OS_TYPE "SUNOS5"
727 # define OS_TYPE "SUNOS5"
728 extern int _etext[], _end[];
729 ptr_t GC_SysVGetDataStart(size_t, ptr_t);
730 # define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext)
731 # define DATAEND (ptr_t)(_end)
732 /* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
733 /* but reportedly breaks under 2.8. It appears that the stack */
734 /* base is a property of the executable, so this should not break */
735 /* old executables. */
736 /* HEURISTIC2 probably works, but this appears to be preferable. */
737 # include <sys/vm.h>
738 # define STACKBOTTOM ((ptr_t) USRSTACK)
739 # ifndef USE_MMAP
740 # define USE_MMAP
741 # endif
742 # ifdef USE_MMAP
743 # define HEAP_START (ptr_t)0x40000000
744 # else
745 # define HEAP_START DATAEND
746 # endif
747 # define PROC_VDB
748 /* HEURISTIC1 reportedly no longer works under 2.7. Thus we */
749 /* switched to HEURISTIC2, eventhough it creates some debugging */
750 /* issues. */
751 # define HEURISTIC2
752 # include <unistd.h>
753 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
754 /* getpagesize() appeared to be missing from at least one */
755 /* Solaris 5.4 installation. Weird. */
756 # define DYNAMIC_LOADING
757 # endif
758 # ifdef SUNOS4
759 # define OS_TYPE "SUNOS4"
760 /* [If you have a weak stomach, don't read this.] */
761 /* We would like to use: */
762 /* # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
763 /* This fails occasionally, due to an ancient, but very */
764 /* persistent ld bug. &etext is set 32 bytes too high. */
765 /* We instead read the text segment size from the a.out */
766 /* header, which happens to be mapped into our address space */
767 /* at the start of the text segment. The detective work here */
768 /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
769 /* Serpette of INRIA. */
770 /* This assumes ZMAGIC, i.e. demand-loadable executables. */
771 # define TEXTSTART 0x2000
772 # define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
773 # define MPROTECT_VDB
774 # define HEURISTIC1
775 # define DYNAMIC_LOADING
776 # endif
777 # ifdef DRSNX
778 # define OS_TYPE "DRSNX"
779 extern char * GC_SysVGetDataStart();
780 extern int etext;
781 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
782 # define MPROTECT_VDB
783 # define STACKBOTTOM ((ptr_t) 0xdfff0000)
784 # define DYNAMIC_LOADING
785 # endif
786 # ifdef LINUX
787 # define OS_TYPE "LINUX"
788 # ifdef __ELF__
789 # define LINUX_DATA_START
790 # define DYNAMIC_LOADING
791 # else
792 Linux Sparc non elf ?
793 # endif
794 extern int _end;
795 # define DATAEND (&_end)
796 # define SVR4
797 # define STACKBOTTOM ((ptr_t) 0xf0000000)
798 # endif
799 # ifdef OPENBSD
800 # define OS_TYPE "OPENBSD"
801 # define STACKBOTTOM ((ptr_t) 0xf8000000)
802 # define DATASTART ((ptr_t)(&etext))
803 # endif
804 # endif
805
806 # ifdef I386
807 # define MACH_TYPE "I386"
808 # define ALIGNMENT 4 /* Appears to hold for all "32 bit" compilers */
809 /* except Borland. The -a4 option fixes */
810 /* Borland. */
811 /* Ivan Demakov: For Watcom the option is -zp4. */
812 # ifndef SMALL_CONFIG
813 # define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
814 /* improvement on Pentiums. */
815 # endif
816 # ifdef SEQUENT
817 # define OS_TYPE "SEQUENT"
818 extern int etext;
819 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
820 # define STACKBOTTOM ((ptr_t) 0x3ffff000)
821 # endif
822 # ifdef SUNOS5
823 # define OS_TYPE "SUNOS5"
824 extern int _etext[], _end[];
825 ptr_t GC_SysVGetDataStart(size_t, ptr_t);
826 # define DATASTART GC_SysVGetDataStart(0x1000, (ptr_t)_etext)
827 # define DATAEND (ptr_t)(_end)
828 /* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
829 /* but reportedly breaks under 2.8. It appears that the stack */
830 /* base is a property of the executable, so this should not break */
831 /* old executables. */
832 /* HEURISTIC2 probably works, but this appears to be preferable. */
833 # include <sys/vm.h>
834 # define STACKBOTTOM ((ptr_t) USRSTACK)
835 /** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
836 /*# define PROC_VDB*/
837 # define DYNAMIC_LOADING
838 # ifndef USE_MMAP
839 # define USE_MMAP
840 # endif
841 # ifdef USE_MMAP
842 # define HEAP_START (ptr_t)0x40000000
843 # else
844 # define HEAP_START DATAEND
845 # endif
846 # endif
847 # ifdef SCO
848 # define OS_TYPE "SCO"
849 extern int etext;
850 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
851 & ~0x3fffff) \
852 +((word)&etext & 0xfff))
853 # define STACKBOTTOM ((ptr_t) 0x7ffffffc)
854 # endif
855 # ifdef SCO_ELF
856 # define OS_TYPE "SCO_ELF"
857 extern int etext;
858 # define DATASTART ((ptr_t)(&etext))
859 # define STACKBOTTOM ((ptr_t) 0x08048000)
860 # define DYNAMIC_LOADING
861 # define ELF_CLASS ELFCLASS32
862 # endif
863 # ifdef LINUX
864 # define OS_TYPE "LINUX"
865 # define LINUX_STACKBOTTOM
866 # if 0
867 # define HEURISTIC1
868 # undef STACK_GRAN
869 # define STACK_GRAN 0x10000000
870 /* STACKBOTTOM is usually 0xc0000000, but this changes with */
871 /* different kernel configurations. In particular, systems */
872 /* with 2GB physical memory will usually move the user */
873 /* address space limit, and hence initial SP to 0x80000000. */
874 # endif
875 # if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
876 # define MPROTECT_VDB
877 # else
878 /* We seem to get random errors in incremental mode, */
879 /* possibly because Linux threads is itself a malloc client */
880 /* and can't deal with the signals. */
881 # endif
882 # ifdef __ELF__
883 # define DYNAMIC_LOADING
884 # ifdef UNDEFINED /* includes ro data */
885 extern int _etext;
886 # define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
887 # endif
888 # include <features.h>
889 # if defined(__GLIBC__) && __GLIBC__ >= 2
890 # define LINUX_DATA_START
891 # else
892 extern char **__environ;
893 # define DATASTART ((ptr_t)(&__environ))
894 /* hideous kludge: __environ is the first */
895 /* word in crt0.o, and delimits the start */
896 /* of the data segment, no matter which */
897 /* ld options were passed through. */
898 /* We could use _etext instead, but that */
899 /* would include .rodata, which may */
900 /* contain large read-only data tables */
901 /* that we'd rather not scan. */
902 # endif
903 extern int _end;
904 # define DATAEND (&_end)
905 # else
906 extern int etext;
907 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
908 # endif
909 # ifdef USE_I686_PREFETCH
910 # define PREFETCH(x) \
911 __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))
912 /* Empirically prefetcht0 is much more effective at reducing */
913 /* cache miss stalls for the targetted load instructions. But it */
914 /* seems to interfere enough with other cache traffic that the net */
915 /* result is worse than prefetchnta. */
916 # if 0
917 /* Using prefetches for write seems to have a slight negative */
918 /* impact on performance, at least for a PIII/500. */
919 # define PREFETCH_FOR_WRITE(x) \
920 __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))
921 # endif
922 # endif
923 # ifdef USE_3DNOW_PREFETCH
924 # define PREFETCH(x) \
925 __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))
926 # define PREFETCH_FOR_WRITE(x)
927 __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))
928 # endif
929 # endif
930 # ifdef CYGWIN32
931 # define OS_TYPE "CYGWIN32"
932 extern int _data_start__;
933 extern int _data_end__;
934 extern int _bss_start__;
935 extern int _bss_end__;
936 /* For binutils 2.9.1, we have */
937 /* DATASTART = _data_start__ */
938 /* DATAEND = _bss_end__ */
939 /* whereas for some earlier versions it was */
940 /* DATASTART = _bss_start__ */
941 /* DATAEND = _data_end__ */
942 /* To get it right for both, we take the */
943 /* minumum/maximum of the two. */
944 # define MAX(x,y) ((x) > (y) ? (x) : (y))
945 # define MIN(x,y) ((x) < (y) ? (x) : (y))
946 # define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
947 # define DATAEND ((ptr_t) MAX(&_data_end__, &_bss_end__))
948 # undef STACK_GRAN
949 # define STACK_GRAN 0x10000
950 # define HEURISTIC1
951 # endif
952 # ifdef OS2
953 # define OS_TYPE "OS2"
954 /* STACKBOTTOM and DATASTART are handled specially in */
955 /* os_dep.c. OS2 actually has the right */
956 /* system call! */
957 # define DATAEND /* not needed */
958 # endif
959 # ifdef MSWIN32
960 # define OS_TYPE "MSWIN32"
961 /* STACKBOTTOM and DATASTART are handled specially in */
962 /* os_dep.c. */
963 # ifndef __WATCOMC__
964 # define MPROTECT_VDB
965 # endif
966 # define DATAEND /* not needed */
967 # endif
968 # ifdef DJGPP
969 # define OS_TYPE "DJGPP"
970 # include "stubinfo.h"
971 extern int etext;
972 extern int _stklen;
973 extern int __djgpp_stack_limit;
974 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
975 /* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
976 + _stklen)) */
977 # define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
978 /* This may not be right. */
979 # endif
980 # ifdef OPENBSD
981 # define OS_TYPE "OPENBSD"
982 # endif
983 # ifdef FREEBSD
984 # define OS_TYPE "FREEBSD"
985 # define MPROTECT_VDB
986 # endif
987 # ifdef NETBSD
988 # define OS_TYPE "NETBSD"
989 # endif
990 # ifdef THREE86BSD
991 # define OS_TYPE "THREE86BSD"
992 # endif
993 # ifdef BSDI
994 # define OS_TYPE "BSDI"
995 # endif
996 # if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
997 || defined(THREE86BSD) || defined(BSDI)
998 # define HEURISTIC2
999 extern char etext;
1000 # define DATASTART ((ptr_t)(&etext))
1001 # endif
1002 # ifdef NEXT
1003 # define OS_TYPE "NEXT"
1004 # define DATASTART ((ptr_t) get_etext())
1005 # define STACKBOTTOM ((ptr_t)0xc0000000)
1006 # define DATAEND /* not needed */
1007 # endif
1008 # ifdef DOS4GW
1009 # define OS_TYPE "DOS4GW"
1010 extern long __nullarea;
1011 extern char _end;
1012 extern char *_STACKTOP;
1013 /* Depending on calling conventions Watcom C either precedes
1014 or does not precedes with undescore names of C-variables.
1015 Make sure startup code variables always have the same names. */
1016 #pragma aux __nullarea "*";
1017 #pragma aux _end "*";
1018 # define STACKBOTTOM ((ptr_t) _STACKTOP)
1019 /* confused? me too. */
1020 # define DATASTART ((ptr_t) &__nullarea)
1021 # define DATAEND ((ptr_t) &_end)
1022 # endif
1023 # ifdef GNU
1024 # define OS_TYPE "GNU"
1025 # endif
1026 # endif
1027
1028 # ifdef NS32K
1029 # define MACH_TYPE "NS32K"
1030 # define ALIGNMENT 4
1031 extern char **environ;
1032 # define DATASTART ((ptr_t)(&environ))
1033 /* hideous kludge: environ is the first */
1034 /* word in crt0.o, and delimits the start */
1035 /* of the data segment, no matter which */
1036 /* ld options were passed through. */
1037 # define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
1038 # endif
1039
1040 # ifdef MIPS
1041 # define MACH_TYPE "MIPS"
1042 # ifdef LINUX
1043 # define CPP_WORDSZ _MIPS_SZPTR
1044 # define OS_TYPE "LINUX"
1045 # define ALIGNMENT 4
1046 # define ALIGN_DOUBLE
1047 extern int _fdata;
1048 # define DATASTART ((ptr_t)(&_fdata))
1049 extern int _end;
1050 # define DATAEND ((ptr_t)(&_end))
1051 # define STACKBOTTOM ((ptr_t)0x7fff8000)
1052 # define USE_GENERIC_PUSH_REGS 1
1053 # define DYNAMIC_LOADING
1054 # endif /* Linux */
1055 # ifdef ULTRIX
1056 # define HEURISTIC2
1057 # define DATASTART (ptr_t)0x10000000
1058 /* Could probably be slightly higher since */
1059 /* startup code allocates lots of stuff. */
1060 # define OS_TYPE "ULTRIX"
1061 # define ALIGNMENT 4
1062 # endif
1063 # ifdef RISCOS
1064 # define HEURISTIC2
1065 # define DATASTART (ptr_t)0x10000000
1066 # define OS_TYPE "RISCOS"
1067 # define ALIGNMENT 4 /* Required by hardware */
1068 # endif
1069 # ifdef IRIX5
1070 # define HEURISTIC2
1071 extern int _fdata;
1072 # define DATASTART ((ptr_t)(&_fdata))
1073 # ifdef USE_MMAP
1074 # define HEAP_START (ptr_t)0x30000000
1075 # else
1076 # define HEAP_START DATASTART
1077 # endif
1078 /* Lowest plausible heap address. */
1079 /* In the MMAP case, we map there. */
1080 /* In either case it is used to identify */
1081 /* heap sections so they're not */
1082 /* considered as roots. */
1083 # define OS_TYPE "IRIX5"
1084 # define MPROTECT_VDB
1085 # ifdef _MIPS_SZPTR
1086 # define CPP_WORDSZ _MIPS_SZPTR
1087 # define ALIGNMENT (_MIPS_SZPTR/8)
1088 # if CPP_WORDSZ != 64
1089 # define ALIGN_DOUBLE
1090 # endif
1091 # else
1092 # define ALIGNMENT 4
1093 # define ALIGN_DOUBLE
1094 # endif
1095 # define DYNAMIC_LOADING
1096 # endif
1097 # endif
1098
1099 # ifdef RS6000
1100 # define MACH_TYPE "RS6000"
1101 # define ALIGNMENT 4
1102 # define DATASTART ((ptr_t)0x20000000)
1103 extern int errno;
1104 # define STACKBOTTOM ((ptr_t)((ulong)&errno))
1105 # define DYNAMIC_LOADING
1106 /* For really old versions of AIX, this may have to be removed. */
1107 # endif
1108
1109 # ifdef HP_PA
1110 /* OS is assumed to be HP/UX */
1111 # define MACH_TYPE "HP_PA"
1112 # define OS_TYPE "HPUX"
1113 # ifdef __LP64__
1114 # define CPP_WORDSZ 64
1115 # define ALIGNMENT 8
1116 # else
1117 # define CPP_WORDSZ 32
1118 # define ALIGNMENT 4
1119 # define ALIGN_DOUBLE
1120 # endif
1121 extern int __data_start;
1122 # define DATASTART ((ptr_t)(&__data_start))
1123 # if 0
1124 /* The following appears to work for 7xx systems running HP/UX */
1125 /* 9.xx Furthermore, it might result in much faster */
1126 /* collections than HEURISTIC2, which may involve scanning */
1127 /* segments that directly precede the stack. It is not the */
1128 /* default, since it may not work on older machine/OS */
1129 /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1130 /* this.) */
1131 # define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1132 # else
1133 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1134 /* to this. We'll probably do this on other platforms, too. */
1135 /* For now I'll use it where I can test it. */
1136 extern char ** environ;
1137 # define STACKBOTTOM ((ptr_t)environ)
1138 # endif
1139 # ifndef SCM_STACK_GROWS_UP /* don't fight with scmconfig.h */
1140 # define SCM_STACK_GROWS_UP 1
1141 # endif
1142 # define DYNAMIC_LOADING
1143 # ifndef HPUX_THREADS
1144 # define MPROTECT_VDB
1145 # endif
1146 # include <unistd.h>
1147 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1148 # endif
1149
1150 # ifdef ALPHA
1151 # define MACH_TYPE "ALPHA"
1152 # define ALIGNMENT 8
1153 # define USE_GENERIC_PUSH_REGS
1154 /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1155 /* fp registers in some cases when the target is a 21264. The assembly */
1156 /* code doesn't handle that yet, and version dependencies make that a */
1157 /* bit tricky. Do the easy thing for now. */
1158 # ifdef OSF1
1159 # define OS_TYPE "OSF1"
1160 # define DATASTART ((ptr_t) 0x140000000)
1161 extern int _end;
1162 # define DATAEND ((ptr_t) &_end)
1163 # define HEURISTIC2
1164 /* Normally HEURISTIC2 is too conervative, since */
1165 /* the text segment immediately follows the stack. */
1166 /* Hence we give an upper pound. */
1167 extern int __start;
1168 # define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
1169 # define CPP_WORDSZ 64
1170 # define MPROTECT_VDB
1171 # define DYNAMIC_LOADING
1172 # endif
1173 # ifdef LINUX
1174 # define OS_TYPE "LINUX"
1175 # define CPP_WORDSZ 64
1176 # define STACKBOTTOM ((ptr_t) 0x120000000)
1177 # ifdef __ELF__
1178 # define LINUX_DATA_START
1179 # define DYNAMIC_LOADING
1180 /* This doesn't work if the collector is in a dynamic library. */
1181 # else
1182 # define DATASTART ((ptr_t) 0x140000000)
1183 # endif
1184 extern int _end;
1185 # define DATAEND (&_end)
1186 # define MPROTECT_VDB
1187 /* Has only been superficially tested. May not */
1188 /* work on all versions. */
1189 # endif
1190 # endif
1191
1192 # ifdef AMD64
1193 # define MACH_TYPE "AMD64"
1194 # define ALIGN_DOUBLE
1195 # define ALIGNMENT 8
1196 # define USE_GENERIC_PUSH_REGS
1197 # endif
1198
1199 # ifdef IA64
1200 # define MACH_TYPE "IA64"
1201 # define ALIGN_DOUBLE
1202 /* Requires 16 byte alignment for malloc */
1203 # define ALIGNMENT 8
1204 # define USE_GENERIC_PUSH_REGS
1205 /* We need to get preserved registers in addition to register windows. */
1206 /* That's easiest to do with setjmp. */
1207 # ifdef HPUX
1208 --> needs work
1209 # endif
1210 # ifdef LINUX
1211 # define OS_TYPE "LINUX"
1212 # define CPP_WORDSZ 64
1213 /* This should really be done through /proc, but that */
1214 /* requires we run on an IA64 kernel. */
1215 # define STACKBOTTOM ((ptr_t) 0xa000000000000000l)
1216 /* We also need the base address of the register stack */
1217 /* backing store. There is probably a better way to */
1218 /* get that, too ... */
1219 # define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l)
1220 # if 1
1221 # define SEARCH_FOR_DATA_START
1222 # define DATASTART GC_data_start
1223 # else
1224 extern int data_start;
1225 # define DATASTART ((ptr_t)(&data_start))
1226 # endif
1227 # define DYNAMIC_LOADING
1228 # define MPROTECT_VDB
1229 /* Requires Linux 2.3.47 or later. */
1230 extern int _end;
1231 # define DATAEND (&_end)
1232 # define PREFETCH(x) \
1233 __asm__ (" lfetch [%0]": : "r"((void *)(x)))
1234 # define PREFETCH_FOR_WRITE(x) \
1235 __asm__ (" lfetch.excl [%0]": : "r"((void *)(x)))
1236 # define CLEAR_DOUBLE(x) \
1237 __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1238 # endif
1239 # endif
1240
1241 # ifdef M88K
1242 # define MACH_TYPE "M88K"
1243 # define ALIGNMENT 4
1244 # define ALIGN_DOUBLE
1245 extern int etext;
1246 # ifdef CX_UX
1247 # define OS_TYPE "CX_UX"
1248 # define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1249 # endif
1250 # ifdef DGUX
1251 # define OS_TYPE "DGUX"
1252 extern char * GC_SysVGetDataStart();
1253 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
1254 # endif
1255 # define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1256 # endif
1257
1258 # ifdef S370
1259 # define MACH_TYPE "S370"
1260 # define OS_TYPE "UTS4"
1261 # define ALIGNMENT 4 /* Required by hardware */
1262 extern int etext;
1263 extern int _etext;
1264 extern int _end;
1265 extern char * GC_SysVGetDataStart();
1266 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
1267 # define DATAEND (&_end)
1268 # define HEURISTIC2
1269 # endif
1270
1271 # if defined(PJ)
1272 # define ALIGNMENT 4
1273 extern int _etext;
1274 # define DATASTART ((ptr_t)(&_etext))
1275 # define HEURISTIC1
1276 # endif
1277
1278 # ifdef ARM32
1279 # define CPP_WORDSZ 32
1280 # define MACH_TYPE "ARM32"
1281 # define ALIGNMENT 4
1282 # ifdef NETBSD
1283 # define OS_TYPE "NETBSD"
1284 # define HEURISTIC2
1285 extern char etext;
1286 # define DATASTART ((ptr_t)(&etext))
1287 # define USE_GENERIC_PUSH_REGS
1288 # endif
1289 # ifdef LINUX
1290 # define OS_TYPE "LINUX"
1291 # define HEURISTIC1
1292 # undef STACK_GRAN
1293 # define STACK_GRAN 0x10000000
1294 # define USE_GENERIC_PUSH_REGS
1295 # ifdef __ELF__
1296 # define DYNAMIC_LOADING
1297 # include <features.h>
1298 # if defined(__GLIBC__) && __GLIBC__ >= 2
1299 # define LINUX_DATA_START
1300 # else
1301 extern char **__environ;
1302 # define DATASTART ((ptr_t)(&__environ))
1303 /* hideous kludge: __environ is the first */
1304 /* word in crt0.o, and delimits the start */
1305 /* of the data segment, no matter which */
1306 /* ld options were passed through. */
1307 /* We could use _etext instead, but that */
1308 /* would include .rodata, which may */
1309 /* contain large read-only data tables */
1310 /* that we'd rather not scan. */
1311 # endif
1312 extern int _end;
1313 # define DATAEND (&_end)
1314 # else
1315 extern int etext;
1316 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
1317 # endif
1318 # endif
1319 #endif
1320
1321 #ifdef LINUX_DATA_START
1322 /* Some Linux distributions arrange to define __data_start. Some */
1323 /* define data_start as a weak symbol. The latter is technically */
1324 /* broken, since the user program may define data_start, in which */
1325 /* case we lose. Nonetheless, we try both, prefering __data_start. */
1326 /* We assume gcc. */
1327 # pragma weak __data_start
1328 extern int __data_start;
1329 # pragma weak data_start
1330 extern int data_start;
1331 # define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
1332 #endif
1333
1334 # if SCM_STACK_GROWS_UP
1335 # define STACK_GROWS_DOWN 0
1336 # else
1337 # define STACK_GROWS_DOWN 1
1338 #endif
1339
1340 # ifndef CPP_WORDSZ
1341 # define CPP_WORDSZ 32
1342 # endif
1343
1344 # ifndef OS_TYPE
1345 # define OS_TYPE ""
1346 # endif
1347
1348 # ifndef DATAEND
1349 extern int end;
1350 # define DATAEND (&end)
1351 # endif
1352
1353 # if defined(SVR4) && !defined(GETPAGESIZE)
1354 # include <unistd.h>
1355 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1356 # endif
1357
1358 # ifndef GETPAGESIZE
1359 # if defined(SUNOS5) || defined(IRIX5)
1360 # include <unistd.h>
1361 # endif
1362 # define GETPAGESIZE() getpagesize()
1363 # endif
1364
1365 # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
1366 /* OS has SVR4 generic features. Probably others also qualify. */
1367 # define SVR4
1368 # endif
1369
1370 # if defined(SUNOS5) || defined(DRSNX)
1371 /* OS has SUNOS5 style semi-undocumented interface to dynamic */
1372 /* loader. */
1373 # define SUNOS5DL
1374 /* OS has SUNOS5 style signal handlers. */
1375 # define SUNOS5SIGS
1376 # endif
1377
1378 # if defined(HPUX)
1379 # define SUNOS5SIGS
1380 # endif
1381
1382 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
1383 -> bad word size
1384 # endif
1385
1386 # ifdef PCR
1387 # undef DYNAMIC_LOADING
1388 # undef STACKBOTTOM
1389 # undef HEURISTIC1
1390 # undef HEURISTIC2
1391 # undef PROC_VDB
1392 # undef MPROTECT_VDB
1393 # define PCR_VDB
1394 # endif
1395
1396 # ifdef SRC_M3
1397 /* Postponed for now. */
1398 # undef PROC_VDB
1399 # undef MPROTECT_VDB
1400 # endif
1401
1402 # ifdef SMALL_CONFIG
1403 /* Presumably not worth the space it takes. */
1404 # undef PROC_VDB
1405 # undef MPROTECT_VDB
1406 # endif
1407
1408 # ifdef USE_MUNMAP
1409 # undef MPROTECT_VDB /* Can't deal with address space holes. */
1410 # endif
1411
1412 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
1413 # define DEFAULT_VDB
1414 # endif
1415
1416 # ifndef PREFETCH
1417 # define PREFETCH(x)
1418 # define NO_PREFETCH
1419 # endif
1420
1421 # ifndef PREFETCH_FOR_WRITE
1422 # define PREFETCH_FOR_WRITE(x)
1423 # define NO_PREFETCH_FOR_WRITE
1424 # endif
1425
1426 # ifndef CACHE_LINE_SIZE
1427 # define CACHE_LINE_SIZE 32 /* Wild guess */
1428 # endif
1429
1430 # ifndef CLEAR_DOUBLE
1431 # define CLEAR_DOUBLE(x) \
1432 ((word*)x)[0] = 0; \
1433 ((word*)x)[1] = 0;
1434 # endif /* CLEAR_DOUBLE */
1435
1436 # if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
1437 # define SOLARIS_THREADS
1438 # endif
1439 # if defined(IRIX_THREADS) && !defined(IRIX5)
1440 --> inconsistent configuration
1441 # endif
1442 # if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
1443 --> inconsistent configuration
1444 # endif
1445 # if defined(LINUX_THREADS) && !defined(LINUX)
1446 --> inconsistent configuration
1447 # endif
1448 # if defined(SOLARIS_THREADS) && !defined(SUNOS5)
1449 --> inconsistent configuration
1450 # endif
1451 # if defined(HPUX_THREADS) && !defined(HPUX)
1452 --> inconsistent configuration
1453 # endif
1454 # if defined(PCR) || defined(SRC_M3) || \
1455 defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
1456 defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
1457 defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
1458 # define THREADS
1459 # endif
1460
1461 # if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
1462 || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
1463 /* Use setjmp based hack to mark from callee-save registers. */
1464 # define USE_GENERIC_PUSH_REGS
1465 # endif
1466 # if defined(SPARC) && !defined(LINUX)
1467 # define SAVE_CALL_CHAIN
1468 # define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
1469 /* include assembly code to do it well. */
1470 # endif
1471
1472 # if defined(LINUX) && !defined(POWERPC)
1473
1474 # if 0
1475 # include <linux/version.h>
1476 # if (LINUX_VERSION_CODE <= 0x10400)
1477 /* Ugly hack to get struct sigcontext_struct definition. Required */
1478 /* for some early 1.3.X releases. Will hopefully go away soon. */
1479 /* in some later Linux releases, asm/sigcontext.h may have to */
1480 /* be included instead. */
1481 # define __KERNEL__
1482 # include <asm/signal.h>
1483 # undef __KERNEL__
1484 # endif
1485
1486 # else
1487
1488 /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
1489 /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
1490 /* prototypes, so we have to include the top-level sigcontext.h to */
1491 /* make sure the former gets defined to be the latter if appropriate. */
1492 # include <features.h>
1493 # if 2 <= __GLIBC__
1494 # if 2 == __GLIBC__ && 0 == __GLIBC_MINOR__
1495 /* glibc 2.1 no longer has sigcontext.h. But signal.h */
1496 /* has the right declaration for glibc 2.1. */
1497 # include <sigcontext.h>
1498 # endif /* 0 == __GLIBC_MINOR__ */
1499 # else /* not 2 <= __GLIBC__ */
1500 /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
1501 /* one. Check LINUX_VERSION_CODE to see which we should reference. */
1502 # include <asm/sigcontext.h>
1503 # endif /* 2 <= __GLIBC__ */
1504 # endif
1505 # endif
1506 # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
1507 # include <sys/types.h>
1508 # if !defined(MSWIN32) && !defined(SUNOS4)
1509 # include <unistd.h>
1510 # endif
1511 # endif
1512
1513 # include <signal.h>
1514
1515 /* Blatantly OS dependent routines, except for those that are related */
1516 /* to dynamic loading. */
1517
1518 # if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
1519 # define NEED_FIND_LIMIT
1520 # endif
1521
1522 # if defined(IRIX_THREADS) || defined(HPUX_THREADS)
1523 # define NEED_FIND_LIMIT
1524 # endif
1525
1526 # if (defined(SUNOS4) && defined(DYNAMIC_LOADING)) && !defined(PCR)
1527 # define NEED_FIND_LIMIT
1528 # endif
1529
1530 # if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
1531 # define NEED_FIND_LIMIT
1532 # endif
1533
1534 # if defined(LINUX) && \
1535 (defined(POWERPC) || defined(SPARC) || defined(ALPHA) || defined(IA64) \
1536 || defined(MIPS))
1537 # define NEED_FIND_LIMIT
1538 # endif
1539
1540 #ifdef NEED_FIND_LIMIT
1541 # include <setjmp.h>
1542 #endif
1543
1544 #if defined(FREEBSD) && defined(I386)
1545 # include <machine/trap.h>
1546 # define ALIGNMENT 4
1547 # define CPP_WORDSZ 32
1548 #endif
1549
1550 #if defined(FREEBSD) && defined(SPARC)
1551 # define ALIGNMENT 8
1552 # define ALIGN_DOUBLE
1553 #endif
1554
1555 #ifdef AMIGA
1556 # include <proto/exec.h>
1557 # include <proto/dos.h>
1558 # include <dos/dosextens.h>
1559 # include <workbench/startup.h>
1560 #endif
1561
1562 #ifdef MSWIN32
1563 # define WIN32_LEAN_AND_MEAN
1564 # define NOSERVICE
1565 # include <windows.h>
1566 #endif
1567
1568 #ifdef MACOS
1569 # include <Processes.h>
1570 #endif
1571
1572 #ifdef IRIX5
1573 # include <sys/uio.h>
1574 # include <stdlib.h> /* for locking */
1575 #endif
1576 #ifdef USE_MMAP
1577 # include <sys/types.h>
1578 # include <sys/mman.h>
1579 # include <sys/stat.h>
1580 # include <fcntl.h>
1581 #endif
1582
1583 #ifdef SUNOS5SIGS
1584 /*# include <sys/siginfo.h>*/
1585 # undef setjmp
1586 # undef longjmp
1587 # define setjmp(env) sigsetjmp(env, 1)
1588 # define longjmp(env, val) siglongjmp(env, val)
1589 # define jmp_buf sigjmp_buf
1590 #endif
1591
1592 #ifdef DJGPP
1593 /* Apparently necessary for djgpp 2.01. May casuse problems with */
1594 /* other versions. */
1595 typedef long unsigned int caddr_t;
1596 #endif
1597
1598 #ifdef PCR
1599 # include "il/PCR_IL.h"
1600 # include "th/PCR_ThCtl.h"
1601 # include "mm/PCR_MM.h"
1602 #endif
1603
1604 #if !defined(NO_EXECUTE_PERMISSION)
1605 # define OPT_PROT_EXEC PROT_EXEC
1606 #else
1607 # define OPT_PROT_EXEC 0
1608 #endif
1609
1610 # ifdef OS2
1611
1612 # include <stddef.h>
1613
1614 # if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
1615
1616 # else /* IBM's compiler */
1617
1618 /* A kludge to get around what appears to be a header file bug */
1619 # ifndef WORD
1620 # define WORD unsigned short
1621 # endif
1622 # ifndef DWORD
1623 # define DWORD unsigned long
1624 # endif
1625
1626 # define EXE386 1
1627 # include <newexe.h>
1628 # include <exe386.h>
1629
1630 # endif /* __IBMC__ */
1631
1632 # define INCL_DOSEXCEPTIONS
1633 # define INCL_DOSPROCESS
1634 # define INCL_DOSERRORS
1635 # define INCL_DOSMODULEMGR
1636 # define INCL_DOSMEMMGR
1637 # include <os2.h>
1638
1639 # endif /*!OS/2 */
1640
1641 /*
1642 * Find the base of the stack.
1643 * Used only in single-threaded environment.
1644 * With threads, GC_mark_roots needs to know how to do this.
1645 * Called with allocator lock held.
1646 */
1647 # ifdef MSWIN32
1648 # define is_writable(prot) ((prot) == PAGE_READWRITE \
1649 || (prot) == PAGE_WRITECOPY \
1650 || (prot) == PAGE_EXECUTE_READWRITE \
1651 || (prot) == PAGE_EXECUTE_WRITECOPY)
1652 /* Return the number of bytes that are writable starting at p. */
1653 /* The pointer p is assumed to be page aligned. */
1654 /* If base is not 0, *base becomes the beginning of the */
1655 /* allocation region containing p. */
GC_get_writable_length(ptr_t p,ptr_t * base)1656 static word GC_get_writable_length(ptr_t p, ptr_t *base)
1657 {
1658 MEMORY_BASIC_INFORMATION buf;
1659 word result;
1660 word protect;
1661
1662 result = VirtualQuery(p, &buf, sizeof(buf));
1663 if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
1664 if (base != 0) *base = (ptr_t)(buf.AllocationBase);
1665 protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
1666 if (!is_writable(protect)) {
1667 return(0);
1668 }
1669 if (buf.State != MEM_COMMIT) return(0);
1670 return(buf.RegionSize);
1671 }
1672
scm_get_stack_base()1673 void *scm_get_stack_base()
1674 {
1675 int dummy;
1676 ptr_t sp = (ptr_t)(&dummy);
1677 ptr_t trunc_sp;
1678 word size;
1679 static word GC_page_size = 0;
1680 if (!GC_page_size) {
1681 SYSTEM_INFO sysinfo;
1682 GetSystemInfo(&sysinfo);
1683 GC_page_size = sysinfo.dwPageSize;
1684 }
1685 trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
1686 size = GC_get_writable_length(trunc_sp, 0);
1687 return(trunc_sp + size);
1688 }
1689
1690
1691 # else
1692
1693 # ifdef OS2
1694
scm_get_stack_base()1695 void *scm_get_stack_base()
1696 {
1697 PTIB ptib;
1698 PPIB ppib;
1699
1700 if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
1701 GC_err_printf0("DosGetInfoBlocks failed\n");
1702 ABORT("DosGetInfoBlocks failed\n");
1703 }
1704 return((ptr_t)(ptib -> tib_pstacklimit));
1705 }
1706
1707 # else
1708
1709 # ifdef AMIGA
1710
scm_get_stack_base()1711 void *scm_get_stack_base()
1712 {
1713 struct Process *proc = (struct Process*)SysBase->ThisTask;
1714
1715 /* Reference: Amiga Guru Book Pages: 42,567,574 */
1716 if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS
1717 && proc->pr_CLI != NULL) {
1718 /* first ULONG is StackSize */
1719 /*longPtr = proc->pr_ReturnAddr;
1720 size = longPtr[0];*/
1721
1722 return (char *)proc->pr_ReturnAddr + sizeof(ULONG);
1723 } else {
1724 return (char *)proc->pr_Task.tc_SPUpper;
1725 }
1726 }
1727
1728 #if 0 /* old version */
1729 void *scm_get_stack_base()
1730 {
1731 extern struct WBStartup *_WBenchMsg;
1732 extern long __base;
1733 extern long __stack;
1734 struct Task *task;
1735 struct Process *proc;
1736 struct CommandLineInterface *cli;
1737 long size;
1738
1739 if ((task = FindTask(0)) == 0) {
1740 GC_err_puts("Cannot find own task structure\n");
1741 ABORT("task missing");
1742 }
1743 proc = (struct Process *)task;
1744 cli = BADDR(proc->pr_CLI);
1745
1746 if (_WBenchMsg != 0 || cli == 0) {
1747 size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
1748 } else {
1749 size = cli->cli_DefaultStack * 4;
1750 }
1751 return (ptr_t)(__base + GC_max(size, __stack));
1752 }
1753 #endif /* 0 */
1754
1755 # else /* !AMIGA, !OS2, ... */
1756
1757 # ifdef NEED_FIND_LIMIT
1758 /* Some tools to implement HEURISTIC2 */
1759 # define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
1760 /* static */ jmp_buf GC_jmp_buf;
1761
1762 /*ARGSUSED*/
1763 #if !(defined(FREEBSD) && defined(SPARC))
GC_fault_handler(sig)1764 static void GC_fault_handler(sig)
1765 int sig;
1766 {
1767 longjmp(GC_jmp_buf, 1);
1768 }
1769 #endif
1770
1771 # ifdef __STDC__
1772 typedef void (*handler)(int);
1773 # else
1774 typedef void (*handler)();
1775 # endif
1776
1777 #if !(defined(FREEBSD) && defined(SPARC))
1778 # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1779 static struct sigaction old_segv_act;
1780 # if defined(_sigargs) || defined(HPUX) /* !Irix6.x */
1781 static struct sigaction old_bus_act;
1782 # endif
1783 # else
1784 static handler old_segv_handler, old_bus_handler;
1785 # endif
1786 #endif
1787
1788 #if !(defined(FREEBSD) && defined(SPARC))
GC_setup_temporary_fault_handler()1789 static void GC_setup_temporary_fault_handler()
1790 {
1791 # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1792 struct sigaction act;
1793
1794 act.sa_handler = GC_fault_handler;
1795 act.sa_flags = SA_RESTART | SA_NODEFER;
1796 /* The presence of SA_NODEFER represents yet another gross */
1797 /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
1798 /* interact correctly with -lthread. We hide the confusion */
1799 /* by making sure that signal handling doesn't affect the */
1800 /* signal mask. */
1801
1802 (void) sigemptyset(&act.sa_mask);
1803 # ifdef IRIX_THREADS
1804 /* Older versions have a bug related to retrieving and */
1805 /* and setting a handler at the same time. */
1806 (void) sigaction(SIGSEGV, 0, &old_segv_act);
1807 (void) sigaction(SIGSEGV, &act, 0);
1808 # else
1809 (void) sigaction(SIGSEGV, &act, &old_segv_act);
1810 # if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1811 || defined(HPUX)
1812 /* Under Irix 5.x or HP/UX, we may get SIGBUS. */
1813 /* Pthreads doesn't exist under Irix 5.x, so we */
1814 /* don't have to worry in the threads case. */
1815 (void) sigaction(SIGBUS, &act, &old_bus_act);
1816 # endif
1817 # endif /* IRIX_THREADS */
1818 # else
1819 old_segv_handler = signal(SIGSEGV, GC_fault_handler);
1820 # ifdef SIGBUS
1821 old_bus_handler = signal(SIGBUS, GC_fault_handler);
1822 # endif
1823 # endif
1824 }
1825 #endif
1826
1827 #if !(defined(FREEBSD) && defined(SPARC))
GC_reset_fault_handler()1828 static void GC_reset_fault_handler()
1829 {
1830 # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1831 (void) sigaction(SIGSEGV, &old_segv_act, 0);
1832 # if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1833 || defined(HPUX)
1834 (void) sigaction(SIGBUS, &old_bus_act, 0);
1835 # endif
1836 # else
1837 (void) signal(SIGSEGV, old_segv_handler);
1838 # ifdef SIGBUS
1839 (void) signal(SIGBUS, old_bus_handler);
1840 # endif
1841 # endif
1842 }
1843 #endif
1844
1845 /* Single argument version, robust against whole program analysis. */
1846 #if !(defined(FREEBSD) && defined(SPARC))
1847 static void
GC_noop1(x)1848 GC_noop1(x)
1849 word x;
1850 {
1851 static VOLATILE word sink;
1852 sink = x;
1853 }
1854 #endif
1855
1856 /* Return the first nonaddressible location > p (up) or */
1857 /* the smallest location q s.t. [q,p] is addressible (!up). */
1858 #if !(defined(FREEBSD) && defined(SPARC))
GC_find_limit(p,up)1859 static ptr_t GC_find_limit(p, up)
1860 ptr_t p;
1861 GC_bool up;
1862 {
1863 static VOLATILE ptr_t result;
1864 /* Needs to be static, since otherwise it may not be */
1865 /* preserved across the longjmp. Can safely be */
1866 /* static since it's only called once, with the */
1867 /* allocation lock held. */
1868
1869
1870 GC_setup_temporary_fault_handler();
1871 if (setjmp(GC_jmp_buf) == 0) {
1872 result = (ptr_t)(((word)(p))
1873 & ~(MIN_PAGE_SIZE-1));
1874 for (;;) {
1875 if (up) {
1876 result += MIN_PAGE_SIZE;
1877 } else {
1878 result -= MIN_PAGE_SIZE;
1879 }
1880 GC_noop1((word)(*result));
1881 }
1882 }
1883 GC_reset_fault_handler();
1884 if (!up) {
1885 result += MIN_PAGE_SIZE;
1886 }
1887 return(result);
1888 }
1889 #endif
1890
1891 # endif
1892
1893 #ifdef LINUX_STACKBOTTOM
1894
1895 #include <sys/types.h>
1896 #include <sys/stat.h>
1897 #include <fcntl.h>
1898
1899 # define STAT_SKIP 27 /* Number of fields preceding startstack */
1900 /* field in /proc/self/stat */
1901
GC_linux_stack_base(void)1902 static ptr_t GC_linux_stack_base(void)
1903 {
1904 /* We read the stack base value from /proc/self/stat. We do this */
1905 /* using direct I/O system calls in order to avoid calling malloc */
1906 /* in case REDIRECT_MALLOC is defined. */
1907 # define STAT_BUF_SIZE 4096
1908 # ifdef USE_LD_WRAP
1909 # define STAT_READ __real_read
1910 # else
1911 # define STAT_READ read
1912 # endif
1913 char stat_buf[STAT_BUF_SIZE];
1914 int f;
1915 char c;
1916 word result = 0;
1917 size_t i, buf_offset = 0;
1918
1919 f = open("/proc/self/stat", O_RDONLY);
1920 if (f < 0 || STAT_READ(f, stat_buf, STAT_BUF_SIZE) < 2 * STAT_SKIP) {
1921 ABORT("Couldn't read /proc/self/stat");
1922 }
1923 c = stat_buf[buf_offset++];
1924 /* Skip the required number of fields. This number is hopefully */
1925 /* constant across all Linux implementations. */
1926 for (i = 0; i < STAT_SKIP; ++i) {
1927 while (isspace(c)) c = stat_buf[buf_offset++];
1928 while (!isspace(c)) c = stat_buf[buf_offset++];
1929 }
1930 while (isspace(c)) c = stat_buf[buf_offset++];
1931 while (isdigit(c)) {
1932 result *= 10;
1933 result += c - '0';
1934 c = stat_buf[buf_offset++];
1935 }
1936 close(f);
1937 if (result < 0x10000000) ABORT("Absurd stack bottom value");
1938 return (ptr_t)result;
1939 }
1940
1941 #endif /* LINUX_STACKBOTTOM */
1942
scm_get_stack_base()1943 void *scm_get_stack_base()
1944 {
1945 word dummy;
1946 void *result;
1947
1948 result = &dummy; /* initialize to silence compiler */
1949
1950 # define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
1951
1952 # ifdef STACKBOTTOM
1953 return(STACKBOTTOM);
1954 # else
1955 # ifdef HEURISTIC1
1956 # if STACK_GROWS_DOWN
1957 result = (ptr_t)((((word)(&dummy))
1958 + STACKBOTTOM_ALIGNMENT_M1)
1959 & ~STACKBOTTOM_ALIGNMENT_M1);
1960 # else
1961 result = (ptr_t)(((word)(&dummy))
1962 & ~STACKBOTTOM_ALIGNMENT_M1);
1963 # endif
1964 # endif /* HEURISTIC1 */
1965 # ifdef LINUX_STACKBOTTOM
1966 result = GC_linux_stack_base();
1967 # endif
1968 # ifdef HEURISTIC2
1969 # if STACK_GROWS_DOWN
1970 result = GC_find_limit((ptr_t)(&dummy), TRUE);
1971 # ifdef HEURISTIC2_LIMIT
1972 if ((ptr_t)result > HEURISTIC2_LIMIT
1973 && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
1974 result = HEURISTIC2_LIMIT;
1975 }
1976 # endif
1977 # else
1978 result = GC_find_limit((ptr_t)(&dummy), FALSE);
1979 # ifdef HEURISTIC2_LIMIT
1980 if (result < HEURISTIC2_LIMIT
1981 && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
1982 result = HEURISTIC2_LIMIT;
1983 }
1984 # endif
1985 # endif
1986
1987 # endif /* HEURISTIC2 */
1988 # if STACK_GROWS_DOWN
1989 if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
1990 # endif
1991 return(result);
1992 # endif /* STACKBOTTOM */
1993 }
1994
1995 # endif /* ! AMIGA */
1996 # endif /* ! OS2 */
1997 # endif /* ! MSWIN32 */
1998
1999 #endif /* mach_type_known */
2000 #endif /* ! HAVE_LIBC_STACK_END */
2001