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(environ): Use _NSGetEnviron in Darwin
[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 Free Software Foundation
7 *
8 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
9 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
10 *
11 * Permission is hereby granted to use or copy this program
12 * for any purpose, provided the above notices are retained on all copies.
13 * Permission to modify the code and to distribute modified code is granted,
14 * provided the above notices are retained, and a notice that the code was
15 * modified is included with the above copyright notice.
16 *
17 */
18
19 /*
20 * Copied from gc5.2, files "os_dep.c", "gc_priv.h", "mark.c" and "gcconfig.h",
21 * and modified for Guile by Marius Vollmer.
22 */
23
24 #if HAVE_CONFIG_H
25 # include <config.h>
26 #endif
27
28 #include <ctype.h>
29 #include "libguile/gc.h"
30 #include "libguile/scmconfig.h"
31
32 #ifdef HAVE_LIBC_STACK_END
33
34 extern void *__libc_stack_end;
35
36 void *
37 scm_get_stack_base ()
38 {
39 return __libc_stack_end;
40 }
41
42 #else
43
44 #define ABORT(msg) abort ()
45
46 typedef char * ptr_t; /* A generic pointer to which we can add */
47 /* byte displacements. */
48 /* Preferably identical to caddr_t, if it */
49 /* exists. */
50
51 /* Define word and signed_word to be unsigned and signed types of the */
52 /* size as char * or void *. There seems to be no way to do this */
53 /* even semi-portably. The following is probably no better/worse */
54 /* than almost anything else. */
55 /* The ANSI standard suggests that size_t and ptr_diff_t might be */
56 /* better choices. But those appear to have incorrect definitions */
57 /* on may systems. Notably "typedef int size_t" seems to be both */
58 /* frequent and WRONG. */
59 typedef unsigned long GC_word;
60 typedef long GC_signed_word;
61
62 typedef GC_word word;
63 typedef GC_signed_word signed_word;
64
65 typedef int GC_bool;
66 # define TRUE 1
67 # define FALSE 0
68
69 #if defined(__STDC__)
70 # include <stdlib.h>
71 # if !(defined( sony_news ) )
72 # include <stddef.h>
73 # endif
74 # define VOLATILE volatile
75 #else
76 # ifdef MSWIN32
77 # include <stdlib.h>
78 # endif
79 # define VOLATILE
80 #endif
81
82 /* Machine dependent parameters. Some tuning parameters can be found */
83 /* near the top of gc_private.h. */
84
85 /* Machine specific parts contributed by various people. See README file. */
86
87 /* First a unified test for Linux: */
88 # if defined(linux) || defined(__linux__)
89 # define LINUX
90 # endif
91
92 /* Determine the machine type: */
93 # if defined(sun) && defined(mc68000)
94 # define M68K
95 # define SUNOS4
96 # define mach_type_known
97 # endif
98 # if defined(hp9000s300)
99 # define M68K
100 # define HP
101 # define mach_type_known
102 # endif
103 # if defined(__OpenBSD__) && defined(m68k)
104 # define M68K
105 # define OPENBSD
106 # define mach_type_known
107 # endif
108 # if defined(__OpenBSD__) && defined(__sparc__)
109 # define SPARC
110 # define OPENBSD
111 # define mach_type_known
112 # endif
113 # if defined(__NetBSD__) && defined(__powerpc__)
114 # define POWERPC
115 # define NETBSD
116 # define mach_type_known
117 # endif
118 # if defined(__NetBSD__) && defined(m68k)
119 # define M68K
120 # define NETBSD
121 # define mach_type_known
122 # endif
123 # if defined(__NetBSD__) && defined(arm32)
124 # define ARM32
125 # define NETBSD
126 # define mach_type_known
127 # endif
128 # if defined(__NetBSD__) && defined(__sparc__)
129 # define SPARC
130 # define NETBSD
131 # define mach_type_known
132 # endif
133 # if defined(vax)
134 # define VAX
135 # ifdef ultrix
136 # define ULTRIX
137 # else
138 # define BSD
139 # endif
140 # define mach_type_known
141 # endif
142 # if defined(mips) || defined(__mips)
143 # define MIPS
144 # if !defined(LINUX)
145 # if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__)
146 # define ULTRIX
147 # else
148 # if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \
149 || defined(__SYSTYPE_SVR4__)
150 # define IRIX5 /* or IRIX 6.X */
151 # else
152 # define RISCOS /* or IRIX 4.X */
153 # endif
154 # endif
155 # endif /* !LINUX */
156 # define mach_type_known
157 # endif
158 # if defined(sequent) && defined(i386)
159 # define I386
160 # define SEQUENT
161 # define mach_type_known
162 # endif
163 # if defined(sun) && defined(i386)
164 # define I386
165 # define SUNOS5
166 # define mach_type_known
167 # endif
168 # if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
169 # define I386
170 # define OS2
171 # define mach_type_known
172 # endif
173 # if defined(ibm032)
174 # define RT
175 # define mach_type_known
176 # endif
177 # if defined(sun) && (defined(sparc) || defined(__sparc))
178 # define SPARC
179 /* Test for SunOS 5.x */
180 # include <errno.h>
181 # ifdef ECHRNG
182 # define SUNOS5
183 # else
184 # define SUNOS4
185 # endif
186 # define mach_type_known
187 # endif
188 # if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
189 && !defined(__OpenBSD__)
190 # define SPARC
191 # define DRSNX
192 # define mach_type_known
193 # endif
194 # if defined(_IBMR2)
195 # define RS6000
196 # define mach_type_known
197 # endif
198 # if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
199 /* The above test may need refinement */
200 # define I386
201 # if defined(_SCO_ELF)
202 # define SCO_ELF
203 # else
204 # define SCO
205 # endif
206 # define mach_type_known
207 # endif
208 # if defined(_AUX_SOURCE)
209 # define M68K
210 # define SYSV
211 # define mach_type_known
212 # endif
213 # if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
214 || defined(hppa) || defined(__hppa__)
215 # define HP_PA
216 # ifndef LINUX
217 # define HPUX
218 # endif
219 # define mach_type_known
220 # endif
221 # if defined(LINUX) && (defined(i386) || defined(__i386__))
222 # define I386
223 # define mach_type_known
224 # endif
225 # if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
226 # define IA64
227 # define mach_type_known
228 # endif
229 # if defined(LINUX) && defined(powerpc)
230 # define POWERPC
231 # define mach_type_known
232 # endif
233 # if defined(LINUX) && defined(__mc68000__)
234 # define M68K
235 # define mach_type_known
236 # endif
237 # if defined(LINUX) && (defined(sparc) || defined(__sparc__))
238 # define SPARC
239 # define mach_type_known
240 # endif
241 # if defined(LINUX) && (defined(arm) || defined (__arm__))
242 # define ARM32
243 # define mach_type_known
244 # endif
245 # if defined(__alpha) || defined(__alpha__)
246 # define ALPHA
247 # if !defined(LINUX)
248 # define OSF1 /* a.k.a Digital Unix */
249 # endif
250 # define mach_type_known
251 # endif
252 # if defined(_AMIGA) && !defined(AMIGA)
253 # define AMIGA
254 # endif
255 # ifdef AMIGA
256 # define M68K
257 # define mach_type_known
258 # endif
259 # if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
260 # define M68K
261 # define MACOS
262 # define mach_type_known
263 # endif
264 # if defined(__MWERKS__) && defined(__powerc)
265 # define POWERPC
266 # define MACOS
267 # define mach_type_known
268 # endif
269 # if defined(macosx)
270 # define MACOSX
271 # define POWERPC
272 # define mach_type_known
273 # endif
274 # if defined(NeXT) && defined(mc68000)
275 # define M68K
276 # define NEXT
277 # define mach_type_known
278 # endif
279 # if defined(NeXT) && defined(i386)
280 # define I386
281 # define NEXT
282 # define mach_type_known
283 # endif
284 # if defined(__OpenBSD__) && (defined(i386) || defined(__i386__))
285 # define I386
286 # define OPENBSD
287 # define mach_type_known
288 # endif
289 # if defined(__FreeBSD__) && defined(i386)
290 # define I386
291 # define FREEBSD
292 # define mach_type_known
293 # endif
294 # if defined(__NetBSD__) && defined(i386)
295 # define I386
296 # define NETBSD
297 # define mach_type_known
298 # endif
299 # if defined(bsdi) && defined(i386)
300 # define I386
301 # define BSDI
302 # define mach_type_known
303 # endif
304 # if !defined(mach_type_known) && defined(__386BSD__)
305 # define I386
306 # define THREE86BSD
307 # define mach_type_known
308 # endif
309 # if defined(_CX_UX) && defined(_M88K)
310 # define M88K
311 # define CX_UX
312 # define mach_type_known
313 # endif
314 # if defined(DGUX)
315 # define M88K
316 /* DGUX defined */
317 # define mach_type_known
318 # endif
319 # if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
320 || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
321 # define I386
322 # define MSWIN32 /* or Win32s */
323 # define mach_type_known
324 # endif
325 # if defined(__DJGPP__)
326 # define I386
327 # ifndef DJGPP
328 # define DJGPP /* MSDOS running the DJGPP port of GCC */
329 # endif
330 # define mach_type_known
331 # endif
332 # if defined(__CYGWIN32__) || defined(__CYGWIN__)
333 # define I386
334 # define CYGWIN32
335 # define mach_type_known
336 # endif
337 # if defined(__MINGW32__)
338 # define I386
339 # define MSWIN32
340 # define mach_type_known
341 # endif
342 # if defined(__BORLANDC__)
343 # define I386
344 # define MSWIN32
345 # define mach_type_known
346 # endif
347 # if defined(_UTS) && !defined(mach_type_known)
348 # define S370
349 # define UTS4
350 # define mach_type_known
351 # endif
352 # if defined(__pj__)
353 # define PJ
354 # define mach_type_known
355 # endif
356 /* Ivan Demakov */
357 # if defined(__WATCOMC__) && defined(__386__)
358 # define I386
359 # if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
360 # if defined(__OS2__)
361 # define OS2
362 # else
363 # if defined(__WINDOWS_386__) || defined(__NT__)
364 # define MSWIN32
365 # else
366 # define DOS4GW
367 # endif
368 # endif
369 # endif
370 # define mach_type_known
371 # endif
372 # if defined(__s390__) && defined(LINUX)
373 # define S370
374 # define mach_type_known
375 # endif
376 # if defined(__GNU__)
377 # define I386
378 # define GNU
379 # define mach_type_known
380 # endif
381 # if defined(__SCO_VERSION__)
382 # define I386
383 # define SYSV
384 # define mach_type_known
385 # endif
386
387 /* Feel free to add more clauses here */
388
389 /* Or manually define the machine type here. A machine type is */
390 /* characterized by the architecture. Some */
391 /* machine types are further subdivided by OS. */
392 /* the macros ULTRIX, RISCOS, and BSD to distinguish. */
393 /* Note that SGI IRIX is treated identically to RISCOS. */
394 /* SYSV on an M68K actually means A/UX. */
395 /* The distinction in these cases is usually the stack starting address */
396 # ifndef mach_type_known
397
398 void *
399 scm_get_stack_base ()
400 {
401 return NULL;
402 }
403
404 # else
405 /* Mapping is: M68K ==> Motorola 680X0 */
406 /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
407 /* MACOS and AMIGA variants) */
408 /* I386 ==> Intel 386 */
409 /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
410 /* FREEBSD, THREE86BSD, MSWIN32, */
411 /* BSDI,SUNOS5, NEXT, other variants) */
412 /* NS32K ==> Encore Multimax */
413 /* MIPS ==> R2000 or R3000 */
414 /* (RISCOS, ULTRIX variants) */
415 /* VAX ==> DEC VAX */
416 /* (BSD, ULTRIX variants) */
417 /* RS6000 ==> IBM RS/6000 AIX3.X */
418 /* RT ==> IBM PC/RT */
419 /* HP_PA ==> HP9000/700 & /800 */
420 /* HP/UX */
421 /* SPARC ==> SPARC under SunOS */
422 /* (SUNOS4, SUNOS5, */
423 /* DRSNX variants) */
424 /* ALPHA ==> DEC Alpha */
425 /* (OSF1 and LINUX variants) */
426 /* M88K ==> Motorola 88XX0 */
427 /* (CX_UX and DGUX) */
428 /* S370 ==> 370-like machine */
429 /* running Amdahl UTS4 */
430 /* ARM32 ==> Intel StrongARM */
431 /* IA64 ==> Intel IA64 */
432 /* (e.g. Itanium) */
433
434
435 /*
436 * For each architecture and OS, the following need to be defined:
437 *
438 * CPP_WORD_SZ is a simple integer constant representing the word size.
439 * in bits. We assume byte addressibility, where a byte has 8 bits.
440 * We also assume CPP_WORD_SZ is either 32 or 64.
441 * (We care about the length of pointers, not hardware
442 * bus widths. Thus a 64 bit processor with a C compiler that uses
443 * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.)
444 *
445 * MACH_TYPE is a string representation of the machine type.
446 * OS_TYPE is analogous for the OS.
447 *
448 * ALIGNMENT is the largest N, such that
449 * all pointer are guaranteed to be aligned on N byte boundaries.
450 * defining it to be 1 will always work, but perform poorly.
451 *
452 * DATASTART is the beginning of the data segment.
453 * On UNIX systems, the collector will scan the area between DATASTART
454 * and DATAEND for root pointers.
455 *
456 * DATAEND, if not &end.
457 *
458 * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
459 * the pointer size.
460 *
461 * STACKBOTTOM is the cool end of the stack, which is usually the
462 * highest address in the stack.
463 * Under PCR or OS/2, we have other ways of finding thread stacks.
464 * For each machine, the following should:
465 * 1) define SCM_STACK_GROWS_UP if the stack grows toward higher addresses, and
466 * 2) define exactly one of
467 * STACKBOTTOM (should be defined to be an expression)
468 * HEURISTIC1
469 * HEURISTIC2
470 * If either of the last two macros are defined, then STACKBOTTOM is computed
471 * during collector startup using one of the following two heuristics:
472 * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
473 * the next multiple of STACK_GRAN.
474 * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
475 * in small steps (decrement if SCM_STACK_GROWS_UP), and read the value
476 * at each location. Remember the value when the first
477 * Segmentation violation or Bus error is signalled. Round that
478 * to the nearest plausible page boundary, and use that instead
479 * of STACKBOTTOM.
480 *
481 * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
482 * the value of environ is a pointer that can serve as STACKBOTTOM.
483 * I expect that HEURISTIC2 can be replaced by this approach, which
484 * interferes far less with debugging.
485 *
486 * If no expression for STACKBOTTOM can be found, and neither of the above
487 * heuristics are usable, the collector can still be used with all of the above
488 * undefined, provided one of the following is done:
489 * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
490 * without reference to STACKBOTTOM. This is appropriate for use in
491 * conjunction with thread packages, since there will be multiple stacks.
492 * (Allocating thread stacks in the heap, and treating them as ordinary
493 * heap data objects is also possible as a last resort. However, this is
494 * likely to introduce significant amounts of excess storage retention
495 * unless the dead parts of the thread stacks are periodically cleared.)
496 * 2) Client code may set GC_stackbottom before calling any GC_ routines.
497 * If the author of the client code controls the main program, this is
498 * easily accomplished by introducing a new main program, setting
499 * GC_stackbottom to the address of a local variable, and then calling
500 * the original main program. The new main program would read something
501 * like:
502 *
503 * # include "gc_private.h"
504 *
505 * main(argc, argv, envp)
506 * int argc;
507 * char **argv, **envp;
508 * {
509 * int dummy;
510 *
511 * GC_stackbottom = (ptr_t)(&dummy);
512 * return(real_main(argc, argv, envp));
513 * }
514 *
515 *
516 * Each architecture may also define the style of virtual dirty bit
517 * implementation to be used:
518 * MPROTECT_VDB: Write protect the heap and catch faults.
519 * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
520 *
521 * An architecture may define DYNAMIC_LOADING if dynamic_load.c
522 * defined GC_register_dynamic_libraries() for the architecture.
523 *
524 * An architecture may define PREFETCH(x) to preload the cache with *x.
525 * This defaults to a no-op.
526 *
527 * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
528 *
529 * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
530 * clear the two words at GC_malloc-aligned address x. By default,
531 * word stores of 0 are used instead.
532 */
533
534
535 # define STACK_GRAN 0x1000000
536 # ifdef M68K
537 # define MACH_TYPE "M68K"
538 # define ALIGNMENT 2
539 # ifdef OPENBSD
540 # define OS_TYPE "OPENBSD"
541 # define HEURISTIC2
542 extern char etext;
543 # define DATASTART ((ptr_t)(&etext))
544 # endif
545 # ifdef NETBSD
546 # define OS_TYPE "NETBSD"
547 # define HEURISTIC2
548 extern char etext;
549 # define DATASTART ((ptr_t)(&etext))
550 # endif
551 # ifdef LINUX
552 # define OS_TYPE "LINUX"
553 # define STACKBOTTOM ((ptr_t)0xf0000000)
554 # define MPROTECT_VDB
555 # ifdef __ELF__
556 # define DYNAMIC_LOADING
557 extern char **__environ;
558 # define DATASTART ((ptr_t)(&__environ))
559 /* hideous kludge: __environ is the first */
560 /* word in crt0.o, and delimits the start */
561 /* of the data segment, no matter which */
562 /* ld options were passed through. */
563 /* We could use _etext instead, but that */
564 /* would include .rodata, which may */
565 /* contain large read-only data tables */
566 /* that we'd rather not scan. */
567 extern int _end;
568 # define DATAEND (&_end)
569 # else
570 extern int etext;
571 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
572 # endif
573 # endif
574 # ifdef SUNOS4
575 # define OS_TYPE "SUNOS4"
576 extern char etext;
577 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff))
578 # define HEURISTIC1 /* differs */
579 # define DYNAMIC_LOADING
580 # endif
581 # ifdef HP
582 # define OS_TYPE "HP"
583 extern char etext;
584 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
585 # define STACKBOTTOM ((ptr_t) 0xffeffffc)
586 /* empirically determined. seems to work. */
587 # include <unistd.h>
588 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
589 # endif
590 # ifdef SYSV
591 # define OS_TYPE "SYSV"
592 extern etext;
593 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
594 & ~0x3fffff) \
595 +((word)&etext & 0x1fff))
596 /* This only works for shared-text binaries with magic number 0413.
597 The other sorts of SysV binaries put the data at the end of the text,
598 in which case the default of &etext would work. Unfortunately,
599 handling both would require having the magic-number available.
600 -- Parag
601 */
602 # define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
603 /* The stack starts at the top of memory, but */
604 /* 0x0 cannot be used as setjump_test complains */
605 /* that the stack direction is incorrect. Two */
606 /* bytes down from 0x0 should be safe enough. */
607 /* --Parag */
608 # include <sys/mmu.h>
609 # define GETPAGESIZE() PAGESIZE /* Is this still right? */
610 # endif
611 # ifdef AMIGA
612 # define OS_TYPE "AMIGA"
613 /* STACKBOTTOM and DATASTART handled specially */
614 /* in os_dep.c */
615 # define DATAEND /* not needed */
616 # define GETPAGESIZE() 4096
617 # endif
618 # ifdef MACOS
619 # ifndef __LOWMEM__
620 # include <LowMem.h>
621 # endif
622 # define OS_TYPE "MACOS"
623 /* see os_dep.c for details of global data segments. */
624 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
625 # define DATAEND /* not needed */
626 # define GETPAGESIZE() 4096
627 # endif
628 # ifdef NEXT
629 # define OS_TYPE "NEXT"
630 # define DATASTART ((ptr_t) get_etext())
631 # define STACKBOTTOM ((ptr_t) 0x4000000)
632 # define DATAEND /* not needed */
633 # endif
634 # endif
635
636 # ifdef POWERPC
637 # define MACH_TYPE "POWERPC"
638 # ifdef MACOS
639 # define ALIGNMENT 2 /* Still necessary? Could it be 4? */
640 # ifndef __LOWMEM__
641 # include <LowMem.h>
642 # endif
643 # define OS_TYPE "MACOS"
644 /* see os_dep.c for details of global data segments. */
645 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
646 # define DATAEND /* not needed */
647 # endif
648 # ifdef LINUX
649 # define ALIGNMENT 4 /* Guess. Can someone verify? */
650 /* This was 2, but that didn't sound right. */
651 # define OS_TYPE "LINUX"
652 # define HEURISTIC1
653 # define DYNAMIC_LOADING
654 # undef STACK_GRAN
655 # define STACK_GRAN 0x10000000
656 /* Stack usually starts at 0x80000000 */
657 # define LINUX_DATA_START
658 extern int _end;
659 # define DATAEND (&_end)
660 # endif
661 # ifdef MACOSX
662 # define ALIGNMENT 4
663 # define OS_TYPE "MACOSX"
664 # define DATASTART ((ptr_t) get_etext())
665 # define STACKBOTTOM ((ptr_t) 0xc0000000)
666 # define DATAEND /* not needed */
667 # endif
668 # endif
669
670 # ifdef VAX
671 # define MACH_TYPE "VAX"
672 # define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
673 extern char etext;
674 # define DATASTART ((ptr_t)(&etext))
675 # ifdef BSD
676 # define OS_TYPE "BSD"
677 # define HEURISTIC1
678 /* HEURISTIC2 may be OK, but it's hard to test. */
679 # endif
680 # ifdef ULTRIX
681 # define OS_TYPE "ULTRIX"
682 # define STACKBOTTOM ((ptr_t) 0x7fffc800)
683 # endif
684 # endif
685
686 # ifdef RT
687 # define MACH_TYPE "RT"
688 # define ALIGNMENT 4
689 # define DATASTART ((ptr_t) 0x10000000)
690 # define STACKBOTTOM ((ptr_t) 0x1fffd800)
691 # endif
692
693 # ifdef SPARC
694 # define MACH_TYPE "SPARC"
695 # define ALIGNMENT 4 /* Required by hardware */
696 # define ALIGN_DOUBLE
697 extern int etext;
698 # ifdef SUNOS5
699 # define OS_TYPE "SUNOS5"
700 extern int _etext;
701 extern int _end;
702 extern char * GC_SysVGetDataStart();
703 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
704 # define DATAEND (&_end)
705 # ifndef USE_MMAP
706 # define USE_MMAP
707 # endif
708 # ifdef USE_MMAP
709 # define HEAP_START (ptr_t)0x40000000
710 # else
711 # define HEAP_START DATAEND
712 # endif
713 # define PROC_VDB
714 /* HEURISTIC1 reportedly no longer works under 2.7. Thus we */
715 /* switched to HEURISTIC2, eventhough it creates some debugging */
716 /* issues. */
717 # define HEURISTIC2
718 # include <unistd.h>
719 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
720 /* getpagesize() appeared to be missing from at least one */
721 /* Solaris 5.4 installation. Weird. */
722 # define DYNAMIC_LOADING
723 # endif
724 # ifdef SUNOS4
725 # define OS_TYPE "SUNOS4"
726 /* [If you have a weak stomach, don't read this.] */
727 /* We would like to use: */
728 /* # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */
729 /* This fails occasionally, due to an ancient, but very */
730 /* persistent ld bug. &etext is set 32 bytes too high. */
731 /* We instead read the text segment size from the a.out */
732 /* header, which happens to be mapped into our address space */
733 /* at the start of the text segment. The detective work here */
734 /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
735 /* Serpette of INRIA. */
736 /* This assumes ZMAGIC, i.e. demand-loadable executables. */
737 # define TEXTSTART 0x2000
738 # define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
739 # define MPROTECT_VDB
740 # define HEURISTIC1
741 # define DYNAMIC_LOADING
742 # endif
743 # ifdef DRSNX
744 # define CPP_WORDSZ 32
745 # define OS_TYPE "DRSNX"
746 extern char * GC_SysVGetDataStart();
747 extern int etext;
748 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
749 # define MPROTECT_VDB
750 # define STACKBOTTOM ((ptr_t) 0xdfff0000)
751 # define DYNAMIC_LOADING
752 # endif
753 # ifdef LINUX
754 # define OS_TYPE "LINUX"
755 # ifdef __ELF__
756 # define LINUX_DATA_START
757 # define DYNAMIC_LOADING
758 # else
759 Linux Sparc non elf ?
760 # endif
761 extern int _end;
762 # define DATAEND (&_end)
763 # define SVR4
764 # define STACKBOTTOM ((ptr_t) 0xf0000000)
765 # endif
766 # ifdef OPENBSD
767 # define OS_TYPE "OPENBSD"
768 # define STACKBOTTOM ((ptr_t) 0xf8000000)
769 # define DATASTART ((ptr_t)(&etext))
770 # endif
771 # endif
772
773 # ifdef I386
774 # define MACH_TYPE "I386"
775 # define ALIGNMENT 4 /* Appears to hold for all "32 bit" compilers */
776 /* except Borland. The -a4 option fixes */
777 /* Borland. */
778 /* Ivan Demakov: For Watcom the option is -zp4. */
779 # ifndef SMALL_CONFIG
780 # define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
781 /* improvement on Pentiums. */
782 # endif
783 # ifdef SEQUENT
784 # define OS_TYPE "SEQUENT"
785 extern int etext;
786 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
787 # define STACKBOTTOM ((ptr_t) 0x3ffff000)
788 # endif
789 # ifdef SUNOS5
790 # define OS_TYPE "SUNOS5"
791 extern int etext, _start;
792 extern char * GC_SysVGetDataStart();
793 # define DATASTART GC_SysVGetDataStart(0x1000, &etext)
794 # define STACKBOTTOM ((ptr_t)(&_start))
795 /** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
796 /*# define PROC_VDB*/
797 # define DYNAMIC_LOADING
798 # ifndef USE_MMAP
799 # define USE_MMAP
800 # endif
801 # ifdef USE_MMAP
802 # define HEAP_START (ptr_t)0x40000000
803 # else
804 # define HEAP_START DATAEND
805 # endif
806 # endif
807 # ifdef SCO
808 # define OS_TYPE "SCO"
809 extern int etext;
810 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \
811 & ~0x3fffff) \
812 +((word)&etext & 0xfff))
813 # define STACKBOTTOM ((ptr_t) 0x7ffffffc)
814 # endif
815 # ifdef SCO_ELF
816 # define OS_TYPE "SCO_ELF"
817 extern int etext;
818 # define DATASTART ((ptr_t)(&etext))
819 # define STACKBOTTOM ((ptr_t) 0x08048000)
820 # define DYNAMIC_LOADING
821 # define ELF_CLASS ELFCLASS32
822 # endif
823 # ifdef LINUX
824 # define OS_TYPE "LINUX"
825 # define LINUX_STACKBOTTOM
826 # if 0
827 # define HEURISTIC1
828 # undef STACK_GRAN
829 # define STACK_GRAN 0x10000000
830 /* STACKBOTTOM is usually 0xc0000000, but this changes with */
831 /* different kernel configurations. In particular, systems */
832 /* with 2GB physical memory will usually move the user */
833 /* address space limit, and hence initial SP to 0x80000000. */
834 # endif
835 # if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
836 # define MPROTECT_VDB
837 # else
838 /* We seem to get random errors in incremental mode, */
839 /* possibly because Linux threads is itself a malloc client */
840 /* and can't deal with the signals. */
841 # endif
842 # ifdef __ELF__
843 # define DYNAMIC_LOADING
844 # ifdef UNDEFINED /* includes ro data */
845 extern int _etext;
846 # define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff))
847 # endif
848 # include <features.h>
849 # if defined(__GLIBC__) && __GLIBC__ >= 2
850 # define LINUX_DATA_START
851 # else
852 extern char **__environ;
853 # define DATASTART ((ptr_t)(&__environ))
854 /* hideous kludge: __environ is the first */
855 /* word in crt0.o, and delimits the start */
856 /* of the data segment, no matter which */
857 /* ld options were passed through. */
858 /* We could use _etext instead, but that */
859 /* would include .rodata, which may */
860 /* contain large read-only data tables */
861 /* that we'd rather not scan. */
862 # endif
863 extern int _end;
864 # define DATAEND (&_end)
865 # else
866 extern int etext;
867 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
868 # endif
869 # ifdef USE_I686_PREFETCH
870 # define PREFETCH(x) \
871 __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))
872 /* Empirically prefetcht0 is much more effective at reducing */
873 /* cache miss stalls for the targetted load instructions. But it */
874 /* seems to interfere enough with other cache traffic that the net */
875 /* result is worse than prefetchnta. */
876 # if 0
877 /* Using prefetches for write seems to have a slight negative */
878 /* impact on performance, at least for a PIII/500. */
879 # define PREFETCH_FOR_WRITE(x) \
880 __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))
881 # endif
882 # endif
883 # ifdef USE_3DNOW_PREFETCH
884 # define PREFETCH(x) \
885 __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))
886 # define PREFETCH_FOR_WRITE(x)
887 __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))
888 # endif
889 # endif
890 # ifdef CYGWIN32
891 # define OS_TYPE "CYGWIN32"
892 extern int _data_start__;
893 extern int _data_end__;
894 extern int _bss_start__;
895 extern int _bss_end__;
896 /* For binutils 2.9.1, we have */
897 /* DATASTART = _data_start__ */
898 /* DATAEND = _bss_end__ */
899 /* whereas for some earlier versions it was */
900 /* DATASTART = _bss_start__ */
901 /* DATAEND = _data_end__ */
902 /* To get it right for both, we take the */
903 /* minumum/maximum of the two. */
904 # define MAX(x,y) ((x) > (y) ? (x) : (y))
905 # define MIN(x,y) ((x) < (y) ? (x) : (y))
906 # define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__))
907 # define DATAEND ((ptr_t) MAX(&_data_end__, &_bss_end__))
908 # undef STACK_GRAN
909 # define STACK_GRAN 0x10000
910 # define HEURISTIC1
911 # endif
912 # ifdef OS2
913 # define OS_TYPE "OS2"
914 /* STACKBOTTOM and DATASTART are handled specially in */
915 /* os_dep.c. OS2 actually has the right */
916 /* system call! */
917 # define DATAEND /* not needed */
918 # endif
919 # ifdef MSWIN32
920 # define OS_TYPE "MSWIN32"
921 /* STACKBOTTOM and DATASTART are handled specially in */
922 /* os_dep.c. */
923 # ifndef __WATCOMC__
924 # define MPROTECT_VDB
925 # endif
926 # define DATAEND /* not needed */
927 # endif
928 # ifdef DJGPP
929 # define OS_TYPE "DJGPP"
930 # include "stubinfo.h"
931 extern int etext;
932 extern int _stklen;
933 extern int __djgpp_stack_limit;
934 # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff))
935 /* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
936 + _stklen)) */
937 # define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
938 /* This may not be right. */
939 # endif
940 # ifdef OPENBSD
941 # define OS_TYPE "OPENBSD"
942 # endif
943 # ifdef FREEBSD
944 # define OS_TYPE "FREEBSD"
945 # define MPROTECT_VDB
946 # endif
947 # ifdef NETBSD
948 # define OS_TYPE "NETBSD"
949 # endif
950 # ifdef THREE86BSD
951 # define OS_TYPE "THREE86BSD"
952 # endif
953 # ifdef BSDI
954 # define OS_TYPE "BSDI"
955 # endif
956 # if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \
957 || defined(THREE86BSD) || defined(BSDI)
958 # define HEURISTIC2
959 extern char etext;
960 # define DATASTART ((ptr_t)(&etext))
961 # endif
962 # ifdef NEXT
963 # define OS_TYPE "NEXT"
964 # define DATASTART ((ptr_t) get_etext())
965 # define STACKBOTTOM ((ptr_t)0xc0000000)
966 # define DATAEND /* not needed */
967 # endif
968 # ifdef DOS4GW
969 # define OS_TYPE "DOS4GW"
970 extern long __nullarea;
971 extern char _end;
972 extern char *_STACKTOP;
973 /* Depending on calling conventions Watcom C either precedes
974 or does not precedes with undescore names of C-variables.
975 Make sure startup code variables always have the same names. */
976 #pragma aux __nullarea "*";
977 #pragma aux _end "*";
978 # define STACKBOTTOM ((ptr_t) _STACKTOP)
979 /* confused? me too. */
980 # define DATASTART ((ptr_t) &__nullarea)
981 # define DATAEND ((ptr_t) &_end)
982 # endif
983 # ifdef GNU
984 # define OS_TYPE "GNU"
985 # endif
986 # endif
987
988 # ifdef NS32K
989 # define MACH_TYPE "NS32K"
990 # define ALIGNMENT 4
991 extern char **environ;
992 # define DATASTART ((ptr_t)(&environ))
993 /* hideous kludge: environ is the first */
994 /* word in crt0.o, and delimits the start */
995 /* of the data segment, no matter which */
996 /* ld options were passed through. */
997 # define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
998 # endif
999
1000 # ifdef MIPS
1001 # define MACH_TYPE "MIPS"
1002 /* # define STACKBOTTOM ((ptr_t)0x7fff8000) sometimes also works. */
1003 # ifdef LINUX
1004 /* This was developed for a linuxce style platform. Probably */
1005 /* needs to be tweaked for workstation class machines. */
1006 # define OS_TYPE "LINUX"
1007 extern int __data_start;
1008 # define DATASTART ((ptr_t)(&__data_start))
1009 # define ALIGNMENT 4
1010 # define USE_GENERIC_PUSH_REGS 1
1011 # define STACKBOTTOM 0x80000000
1012 /* In many cases, this should probably use LINUX_STACKBOTTOM */
1013 /* instead. But some kernel versions seem to give the wrong */
1014 /* value from /proc. */
1015 # endif /* Linux */
1016 # ifdef ULTRIX
1017 # define HEURISTIC2
1018 # define DATASTART (ptr_t)0x10000000
1019 /* Could probably be slightly higher since */
1020 /* startup code allocates lots of stuff. */
1021 # define OS_TYPE "ULTRIX"
1022 # define ALIGNMENT 4
1023 # endif
1024 # ifdef RISCOS
1025 # define HEURISTIC2
1026 # define DATASTART (ptr_t)0x10000000
1027 # define OS_TYPE "RISCOS"
1028 # define ALIGNMENT 4 /* Required by hardware */
1029 # endif
1030 # ifdef IRIX5
1031 # define HEURISTIC2
1032 extern int _fdata;
1033 # define DATASTART ((ptr_t)(&_fdata))
1034 # ifdef USE_MMAP
1035 # define HEAP_START (ptr_t)0x30000000
1036 # else
1037 # define HEAP_START DATASTART
1038 # endif
1039 /* Lowest plausible heap address. */
1040 /* In the MMAP case, we map there. */
1041 /* In either case it is used to identify */
1042 /* heap sections so they're not */
1043 /* considered as roots. */
1044 # define OS_TYPE "IRIX5"
1045 # define MPROTECT_VDB
1046 # ifdef _MIPS_SZPTR
1047 # define CPP_WORDSZ _MIPS_SZPTR
1048 # define ALIGNMENT (_MIPS_SZPTR/8)
1049 # if CPP_WORDSZ != 64
1050 # define ALIGN_DOUBLE
1051 # endif
1052 # else
1053 # define ALIGNMENT 4
1054 # define ALIGN_DOUBLE
1055 # endif
1056 # define DYNAMIC_LOADING
1057 # endif
1058 # endif
1059
1060 # ifdef RS6000
1061 # define MACH_TYPE "RS6000"
1062 # define ALIGNMENT 4
1063 # define DATASTART ((ptr_t)0x20000000)
1064 extern int errno;
1065 # define STACKBOTTOM ((ptr_t)((ulong)&errno))
1066 # define DYNAMIC_LOADING
1067 /* For really old versions of AIX, this may have to be removed. */
1068 # endif
1069
1070 # ifdef HP_PA
1071 /* OS is assumed to be HP/UX */
1072 # define MACH_TYPE "HP_PA"
1073 # define OS_TYPE "HPUX"
1074 # ifdef __LP64__
1075 # define CPP_WORDSZ 64
1076 # define ALIGNMENT 8
1077 # else
1078 # define CPP_WORDSZ 32
1079 # define ALIGNMENT 4
1080 # define ALIGN_DOUBLE
1081 # endif
1082 extern int __data_start;
1083 # define DATASTART ((ptr_t)(&__data_start))
1084 # if 0
1085 /* The following appears to work for 7xx systems running HP/UX */
1086 /* 9.xx Furthermore, it might result in much faster */
1087 /* collections than HEURISTIC2, which may involve scanning */
1088 /* segments that directly precede the stack. It is not the */
1089 /* default, since it may not work on older machine/OS */
1090 /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1091 /* this.) */
1092 # define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1093 # else
1094 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1095 /* to this. We'll probably do this on other platforms, too. */
1096 /* For now I'll use it where I can test it. */
1097 extern char ** environ;
1098 # define STACKBOTTOM ((ptr_t)environ)
1099 # endif
1100 # ifndef SCM_STACK_GROWS_UP /* don't fight with scmconfig.h */
1101 # define SCM_STACK_GROWS_UP 1
1102 # endif
1103 # define DYNAMIC_LOADING
1104 # ifndef HPUX_THREADS
1105 # define MPROTECT_VDB
1106 # endif
1107 # include <unistd.h>
1108 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1109 # endif
1110
1111 # ifdef ALPHA
1112 # define MACH_TYPE "ALPHA"
1113 # define ALIGNMENT 8
1114 # define USE_GENERIC_PUSH_REGS
1115 /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1116 /* fp registers in some cases when the target is a 21264. The assembly */
1117 /* code doesn't handle that yet, and version dependencies make that a */
1118 /* bit tricky. Do the easy thing for now. */
1119 # ifdef OSF1
1120 # define OS_TYPE "OSF1"
1121 # define DATASTART ((ptr_t) 0x140000000)
1122 extern _end;
1123 # define DATAEND ((ptr_t) &_end)
1124 # define HEURISTIC2
1125 /* Normally HEURISTIC2 is too conervative, since */
1126 /* the text segment immediately follows the stack. */
1127 /* Hence we give an upper pound. */
1128 extern int __start;
1129 # define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1)))
1130 # define CPP_WORDSZ 64
1131 # define MPROTECT_VDB
1132 # define DYNAMIC_LOADING
1133 # endif
1134 # ifdef LINUX
1135 # define OS_TYPE "LINUX"
1136 # define CPP_WORDSZ 64
1137 # define STACKBOTTOM ((ptr_t) 0x120000000)
1138 # ifdef __ELF__
1139 # define LINUX_DATA_START
1140 # define DYNAMIC_LOADING
1141 /* This doesn't work if the collector is in a dynamic library. */
1142 # else
1143 # define DATASTART ((ptr_t) 0x140000000)
1144 # endif
1145 extern int _end;
1146 # define DATAEND (&_end)
1147 # define MPROTECT_VDB
1148 /* Has only been superficially tested. May not */
1149 /* work on all versions. */
1150 # endif
1151 # endif
1152
1153 # ifdef IA64
1154 # define MACH_TYPE "IA64"
1155 # define ALIGN_DOUBLE
1156 /* Requires 16 byte alignment for malloc */
1157 # define ALIGNMENT 8
1158 # define USE_GENERIC_PUSH_REGS
1159 /* We need to get preserved registers in addition to register windows. */
1160 /* That's easiest to do with setjmp. */
1161 # ifdef HPUX
1162 --> needs work
1163 # endif
1164 # ifdef LINUX
1165 # define OS_TYPE "LINUX"
1166 # define CPP_WORDSZ 64
1167 /* This should really be done through /proc, but that */
1168 /* requires we run on an IA64 kernel. */
1169 # define STACKBOTTOM ((ptr_t) 0xa000000000000000l)
1170 /* We also need the base address of the register stack */
1171 /* backing store. There is probably a better way to */
1172 /* get that, too ... */
1173 # define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l)
1174 # if 1
1175 # define SEARCH_FOR_DATA_START
1176 # define DATASTART GC_data_start
1177 # else
1178 extern int data_start;
1179 # define DATASTART ((ptr_t)(&data_start))
1180 # endif
1181 # define DYNAMIC_LOADING
1182 # define MPROTECT_VDB
1183 /* Requires Linux 2.3.47 or later. */
1184 extern int _end;
1185 # define DATAEND (&_end)
1186 # define PREFETCH(x) \
1187 __asm__ (" lfetch [%0]": : "r"((void *)(x)))
1188 # define PREFETCH_FOR_WRITE(x) \
1189 __asm__ (" lfetch.excl [%0]": : "r"((void *)(x)))
1190 # define CLEAR_DOUBLE(x) \
1191 __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1192 # endif
1193 # endif
1194
1195 # ifdef M88K
1196 # define MACH_TYPE "M88K"
1197 # define ALIGNMENT 4
1198 # define ALIGN_DOUBLE
1199 extern int etext;
1200 # ifdef CX_UX
1201 # define OS_TYPE "CX_UX"
1202 # define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1203 # endif
1204 # ifdef DGUX
1205 # define OS_TYPE "DGUX"
1206 extern char * GC_SysVGetDataStart();
1207 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext)
1208 # endif
1209 # define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1210 # endif
1211
1212 # ifdef S370
1213 # define MACH_TYPE "S370"
1214 # define OS_TYPE "UTS4"
1215 # define ALIGNMENT 4 /* Required by hardware */
1216 extern int etext;
1217 extern int _etext;
1218 extern int _end;
1219 extern char * GC_SysVGetDataStart();
1220 # define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext)
1221 # define DATAEND (&_end)
1222 # define HEURISTIC2
1223 # endif
1224
1225 # if defined(PJ)
1226 # define ALIGNMENT 4
1227 extern int _etext;
1228 # define DATASTART ((ptr_t)(&_etext))
1229 # define HEURISTIC1
1230 # endif
1231
1232 # ifdef ARM32
1233 # define CPP_WORDSZ 32
1234 # define MACH_TYPE "ARM32"
1235 # define ALIGNMENT 4
1236 # ifdef NETBSD
1237 # define OS_TYPE "NETBSD"
1238 # define HEURISTIC2
1239 extern char etext;
1240 # define DATASTART ((ptr_t)(&etext))
1241 # define USE_GENERIC_PUSH_REGS
1242 # endif
1243 # ifdef LINUX
1244 # define OS_TYPE "LINUX"
1245 # define HEURISTIC1
1246 # undef STACK_GRAN
1247 # define STACK_GRAN 0x10000000
1248 # define USE_GENERIC_PUSH_REGS
1249 # ifdef __ELF__
1250 # define DYNAMIC_LOADING
1251 # include <features.h>
1252 # if defined(__GLIBC__) && __GLIBC__ >= 2
1253 # define LINUX_DATA_START
1254 # else
1255 extern char **__environ;
1256 # define DATASTART ((ptr_t)(&__environ))
1257 /* hideous kludge: __environ is the first */
1258 /* word in crt0.o, and delimits the start */
1259 /* of the data segment, no matter which */
1260 /* ld options were passed through. */
1261 /* We could use _etext instead, but that */
1262 /* would include .rodata, which may */
1263 /* contain large read-only data tables */
1264 /* that we'd rather not scan. */
1265 # endif
1266 extern int _end;
1267 # define DATAEND (&_end)
1268 # else
1269 extern int etext;
1270 # define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff))
1271 # endif
1272 # endif
1273 #endif
1274
1275 #ifdef LINUX_DATA_START
1276 /* Some Linux distributions arrange to define __data_start. Some */
1277 /* define data_start as a weak symbol. The latter is technically */
1278 /* broken, since the user program may define data_start, in which */
1279 /* case we lose. Nonetheless, we try both, prefering __data_start. */
1280 /* We assume gcc. */
1281 # pragma weak __data_start
1282 extern int __data_start;
1283 # pragma weak data_start
1284 extern int data_start;
1285 # define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start))
1286 #endif
1287
1288 # if SCM_STACK_GROWS_UP
1289 # define STACK_GROWS_DOWN 0
1290 # else
1291 # define STACK_GROWS_DOWN 1
1292 #endif
1293
1294 # ifndef CPP_WORDSZ
1295 # define CPP_WORDSZ 32
1296 # endif
1297
1298 # ifndef OS_TYPE
1299 # define OS_TYPE ""
1300 # endif
1301
1302 # ifndef DATAEND
1303 extern int end;
1304 # define DATAEND (&end)
1305 # endif
1306
1307 # if defined(SVR4) && !defined(GETPAGESIZE)
1308 # include <unistd.h>
1309 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1310 # endif
1311
1312 # ifndef GETPAGESIZE
1313 # if defined(SUNOS5) || defined(IRIX5)
1314 # include <unistd.h>
1315 # endif
1316 # define GETPAGESIZE() getpagesize()
1317 # endif
1318
1319 # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
1320 /* OS has SVR4 generic features. Probably others also qualify. */
1321 # define SVR4
1322 # endif
1323
1324 # if defined(SUNOS5) || defined(DRSNX)
1325 /* OS has SUNOS5 style semi-undocumented interface to dynamic */
1326 /* loader. */
1327 # define SUNOS5DL
1328 /* OS has SUNOS5 style signal handlers. */
1329 # define SUNOS5SIGS
1330 # endif
1331
1332 # if defined(HPUX)
1333 # define SUNOS5SIGS
1334 # endif
1335
1336 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
1337 -> bad word size
1338 # endif
1339
1340 # ifdef PCR
1341 # undef DYNAMIC_LOADING
1342 # undef STACKBOTTOM
1343 # undef HEURISTIC1
1344 # undef HEURISTIC2
1345 # undef PROC_VDB
1346 # undef MPROTECT_VDB
1347 # define PCR_VDB
1348 # endif
1349
1350 # ifdef SRC_M3
1351 /* Postponed for now. */
1352 # undef PROC_VDB
1353 # undef MPROTECT_VDB
1354 # endif
1355
1356 # ifdef SMALL_CONFIG
1357 /* Presumably not worth the space it takes. */
1358 # undef PROC_VDB
1359 # undef MPROTECT_VDB
1360 # endif
1361
1362 # ifdef USE_MUNMAP
1363 # undef MPROTECT_VDB /* Can't deal with address space holes. */
1364 # endif
1365
1366 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
1367 # define DEFAULT_VDB
1368 # endif
1369
1370 # ifndef PREFETCH
1371 # define PREFETCH(x)
1372 # define NO_PREFETCH
1373 # endif
1374
1375 # ifndef PREFETCH_FOR_WRITE
1376 # define PREFETCH_FOR_WRITE(x)
1377 # define NO_PREFETCH_FOR_WRITE
1378 # endif
1379
1380 # ifndef CACHE_LINE_SIZE
1381 # define CACHE_LINE_SIZE 32 /* Wild guess */
1382 # endif
1383
1384 # ifndef CLEAR_DOUBLE
1385 # define CLEAR_DOUBLE(x) \
1386 ((word*)x)[0] = 0; \
1387 ((word*)x)[1] = 0;
1388 # endif /* CLEAR_DOUBLE */
1389
1390 # if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
1391 # define SOLARIS_THREADS
1392 # endif
1393 # if defined(IRIX_THREADS) && !defined(IRIX5)
1394 --> inconsistent configuration
1395 # endif
1396 # if defined(IRIX_JDK_THREADS) && !defined(IRIX5)
1397 --> inconsistent configuration
1398 # endif
1399 # if defined(LINUX_THREADS) && !defined(LINUX)
1400 --> inconsistent configuration
1401 # endif
1402 # if defined(SOLARIS_THREADS) && !defined(SUNOS5)
1403 --> inconsistent configuration
1404 # endif
1405 # if defined(HPUX_THREADS) && !defined(HPUX)
1406 --> inconsistent configuration
1407 # endif
1408 # if defined(PCR) || defined(SRC_M3) || \
1409 defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
1410 defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
1411 defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
1412 # define THREADS
1413 # endif
1414
1415 # if defined(HP_PA) || defined(M88K) || defined(POWERPC) \
1416 || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT)
1417 /* Use setjmp based hack to mark from callee-save registers. */
1418 # define USE_GENERIC_PUSH_REGS
1419 # endif
1420 # if defined(SPARC) && !defined(LINUX)
1421 # define SAVE_CALL_CHAIN
1422 # define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
1423 /* include assembly code to do it well. */
1424 # endif
1425
1426 # if defined(LINUX) && !defined(POWERPC)
1427
1428 # if 0
1429 # include <linux/version.h>
1430 # if (LINUX_VERSION_CODE <= 0x10400)
1431 /* Ugly hack to get struct sigcontext_struct definition. Required */
1432 /* for some early 1.3.X releases. Will hopefully go away soon. */
1433 /* in some later Linux releases, asm/sigcontext.h may have to */
1434 /* be included instead. */
1435 # define __KERNEL__
1436 # include <asm/signal.h>
1437 # undef __KERNEL__
1438 # endif
1439
1440 # else
1441
1442 /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
1443 /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
1444 /* prototypes, so we have to include the top-level sigcontext.h to */
1445 /* make sure the former gets defined to be the latter if appropriate. */
1446 # include <features.h>
1447 # if 2 <= __GLIBC__
1448 # if 2 == __GLIBC__ && 0 == __GLIBC_MINOR__
1449 /* glibc 2.1 no longer has sigcontext.h. But signal.h */
1450 /* has the right declaration for glibc 2.1. */
1451 # include <sigcontext.h>
1452 # endif /* 0 == __GLIBC_MINOR__ */
1453 # else /* not 2 <= __GLIBC__ */
1454 /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
1455 /* one. Check LINUX_VERSION_CODE to see which we should reference. */
1456 # include <asm/sigcontext.h>
1457 # endif /* 2 <= __GLIBC__ */
1458 # endif
1459 # endif
1460 # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
1461 # include <sys/types.h>
1462 # if !defined(MSWIN32) && !defined(SUNOS4)
1463 # include <unistd.h>
1464 # endif
1465 # endif
1466
1467 # include <signal.h>
1468
1469 /* Blatantly OS dependent routines, except for those that are related */
1470 /* to dynamic loading. */
1471
1472 # if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
1473 # define NEED_FIND_LIMIT
1474 # endif
1475
1476 # if defined(IRIX_THREADS) || defined(HPUX_THREADS)
1477 # define NEED_FIND_LIMIT
1478 # endif
1479
1480 # if (defined(SUNOS4) && defined(DYNAMIC_LOADING)) && !defined(PCR)
1481 # define NEED_FIND_LIMIT
1482 # endif
1483
1484 # if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
1485 # define NEED_FIND_LIMIT
1486 # endif
1487
1488 # if defined(LINUX) && \
1489 (defined(POWERPC) || defined(SPARC) || defined(ALPHA) || defined(IA64) \
1490 || defined(MIPS))
1491 # define NEED_FIND_LIMIT
1492 # endif
1493
1494 #ifdef NEED_FIND_LIMIT
1495 # include <setjmp.h>
1496 #endif
1497
1498 #ifdef FREEBSD
1499 # include <machine/trap.h>
1500 #endif
1501
1502 #ifdef AMIGA
1503 # include <proto/exec.h>
1504 # include <proto/dos.h>
1505 # include <dos/dosextens.h>
1506 # include <workbench/startup.h>
1507 #endif
1508
1509 #ifdef MSWIN32
1510 # define WIN32_LEAN_AND_MEAN
1511 # define NOSERVICE
1512 # include <windows.h>
1513 #endif
1514
1515 #ifdef MACOS
1516 # include <Processes.h>
1517 #endif
1518
1519 #ifdef IRIX5
1520 # include <sys/uio.h>
1521 # include <malloc.h> /* for locking */
1522 #endif
1523 #ifdef USE_MMAP
1524 # include <sys/types.h>
1525 # include <sys/mman.h>
1526 # include <sys/stat.h>
1527 # include <fcntl.h>
1528 #endif
1529
1530 #ifdef SUNOS5SIGS
1531 # include <sys/siginfo.h>
1532 # undef setjmp
1533 # undef longjmp
1534 # define setjmp(env) sigsetjmp(env, 1)
1535 # define longjmp(env, val) siglongjmp(env, val)
1536 # define jmp_buf sigjmp_buf
1537 #endif
1538
1539 #ifdef DJGPP
1540 /* Apparently necessary for djgpp 2.01. May casuse problems with */
1541 /* other versions. */
1542 typedef long unsigned int caddr_t;
1543 #endif
1544
1545 #ifdef PCR
1546 # include "il/PCR_IL.h"
1547 # include "th/PCR_ThCtl.h"
1548 # include "mm/PCR_MM.h"
1549 #endif
1550
1551 #if !defined(NO_EXECUTE_PERMISSION)
1552 # define OPT_PROT_EXEC PROT_EXEC
1553 #else
1554 # define OPT_PROT_EXEC 0
1555 #endif
1556
1557 # ifdef OS2
1558
1559 # include <stddef.h>
1560
1561 # if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
1562
1563 # else /* IBM's compiler */
1564
1565 /* A kludge to get around what appears to be a header file bug */
1566 # ifndef WORD
1567 # define WORD unsigned short
1568 # endif
1569 # ifndef DWORD
1570 # define DWORD unsigned long
1571 # endif
1572
1573 # define EXE386 1
1574 # include <newexe.h>
1575 # include <exe386.h>
1576
1577 # endif /* __IBMC__ */
1578
1579 # define INCL_DOSEXCEPTIONS
1580 # define INCL_DOSPROCESS
1581 # define INCL_DOSERRORS
1582 # define INCL_DOSMODULEMGR
1583 # define INCL_DOSMEMMGR
1584 # include <os2.h>
1585
1586 # endif /*!OS/2 */
1587
1588 /*
1589 * Find the base of the stack.
1590 * Used only in single-threaded environment.
1591 * With threads, GC_mark_roots needs to know how to do this.
1592 * Called with allocator lock held.
1593 */
1594 # ifdef MSWIN32
1595 # define is_writable(prot) ((prot) == PAGE_READWRITE \
1596 || (prot) == PAGE_WRITECOPY \
1597 || (prot) == PAGE_EXECUTE_READWRITE \
1598 || (prot) == PAGE_EXECUTE_WRITECOPY)
1599 /* Return the number of bytes that are writable starting at p. */
1600 /* The pointer p is assumed to be page aligned. */
1601 /* If base is not 0, *base becomes the beginning of the */
1602 /* allocation region containing p. */
1603 static word GC_get_writable_length(ptr_t p, ptr_t *base)
1604 {
1605 MEMORY_BASIC_INFORMATION buf;
1606 word result;
1607 word protect;
1608
1609 result = VirtualQuery(p, &buf, sizeof(buf));
1610 if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
1611 if (base != 0) *base = (ptr_t)(buf.AllocationBase);
1612 protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
1613 if (!is_writable(protect)) {
1614 return(0);
1615 }
1616 if (buf.State != MEM_COMMIT) return(0);
1617 return(buf.RegionSize);
1618 }
1619
1620 void *scm_get_stack_base()
1621 {
1622 int dummy;
1623 ptr_t sp = (ptr_t)(&dummy);
1624 ptr_t trunc_sp;
1625 word size;
1626 static word GC_page_size = 0;
1627 if (!GC_page_size) {
1628 SYSTEM_INFO sysinfo;
1629 GetSystemInfo(&sysinfo);
1630 GC_page_size = sysinfo.dwPageSize;
1631 }
1632 trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
1633 size = GC_get_writable_length(trunc_sp, 0);
1634 return(trunc_sp + size);
1635 }
1636
1637
1638 # else
1639
1640 # ifdef OS2
1641
1642 void *scm_get_stack_base()
1643 {
1644 PTIB ptib;
1645 PPIB ppib;
1646
1647 if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
1648 GC_err_printf0("DosGetInfoBlocks failed\n");
1649 ABORT("DosGetInfoBlocks failed\n");
1650 }
1651 return((ptr_t)(ptib -> tib_pstacklimit));
1652 }
1653
1654 # else
1655
1656 # ifdef AMIGA
1657
1658 void *scm_get_stack_base()
1659 {
1660 struct Process *proc = (struct Process*)SysBase->ThisTask;
1661
1662 /* Reference: Amiga Guru Book Pages: 42,567,574 */
1663 if (proc->pr_Task.tc_Node.ln_Type==NT_PROCESS
1664 && proc->pr_CLI != NULL) {
1665 /* first ULONG is StackSize */
1666 /*longPtr = proc->pr_ReturnAddr;
1667 size = longPtr[0];*/
1668
1669 return (char *)proc->pr_ReturnAddr + sizeof(ULONG);
1670 } else {
1671 return (char *)proc->pr_Task.tc_SPUpper;
1672 }
1673 }
1674
1675 #if 0 /* old version */
1676 void *scm_get_stack_base()
1677 {
1678 extern struct WBStartup *_WBenchMsg;
1679 extern long __base;
1680 extern long __stack;
1681 struct Task *task;
1682 struct Process *proc;
1683 struct CommandLineInterface *cli;
1684 long size;
1685
1686 if ((task = FindTask(0)) == 0) {
1687 GC_err_puts("Cannot find own task structure\n");
1688 ABORT("task missing");
1689 }
1690 proc = (struct Process *)task;
1691 cli = BADDR(proc->pr_CLI);
1692
1693 if (_WBenchMsg != 0 || cli == 0) {
1694 size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
1695 } else {
1696 size = cli->cli_DefaultStack * 4;
1697 }
1698 return (ptr_t)(__base + GC_max(size, __stack));
1699 }
1700 #endif /* 0 */
1701
1702 # else /* !AMIGA, !OS2, ... */
1703
1704 # ifdef NEED_FIND_LIMIT
1705 /* Some tools to implement HEURISTIC2 */
1706 # define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
1707 /* static */ jmp_buf GC_jmp_buf;
1708
1709 /*ARGSUSED*/
1710 static void GC_fault_handler(sig)
1711 int sig;
1712 {
1713 longjmp(GC_jmp_buf, 1);
1714 }
1715
1716 # ifdef __STDC__
1717 typedef void (*handler)(int);
1718 # else
1719 typedef void (*handler)();
1720 # endif
1721
1722 # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1723 static struct sigaction old_segv_act;
1724 # if defined(_sigargs) || defined(HPUX) /* !Irix6.x */
1725 static struct sigaction old_bus_act;
1726 # endif
1727 # else
1728 static handler old_segv_handler, old_bus_handler;
1729 # endif
1730
1731 static void GC_setup_temporary_fault_handler()
1732 {
1733 # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1734 struct sigaction act;
1735
1736 act.sa_handler = GC_fault_handler;
1737 act.sa_flags = SA_RESTART | SA_NODEFER;
1738 /* The presence of SA_NODEFER represents yet another gross */
1739 /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
1740 /* interact correctly with -lthread. We hide the confusion */
1741 /* by making sure that signal handling doesn't affect the */
1742 /* signal mask. */
1743
1744 (void) sigemptyset(&act.sa_mask);
1745 # ifdef IRIX_THREADS
1746 /* Older versions have a bug related to retrieving and */
1747 /* and setting a handler at the same time. */
1748 (void) sigaction(SIGSEGV, 0, &old_segv_act);
1749 (void) sigaction(SIGSEGV, &act, 0);
1750 # else
1751 (void) sigaction(SIGSEGV, &act, &old_segv_act);
1752 # if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1753 || defined(HPUX)
1754 /* Under Irix 5.x or HP/UX, we may get SIGBUS. */
1755 /* Pthreads doesn't exist under Irix 5.x, so we */
1756 /* don't have to worry in the threads case. */
1757 (void) sigaction(SIGBUS, &act, &old_bus_act);
1758 # endif
1759 # endif /* IRIX_THREADS */
1760 # else
1761 old_segv_handler = signal(SIGSEGV, GC_fault_handler);
1762 # ifdef SIGBUS
1763 old_bus_handler = signal(SIGBUS, GC_fault_handler);
1764 # endif
1765 # endif
1766 }
1767
1768 static void GC_reset_fault_handler()
1769 {
1770 # if defined(SUNOS5SIGS) || defined(IRIX5) || defined(OSF1)
1771 (void) sigaction(SIGSEGV, &old_segv_act, 0);
1772 # if defined(IRIX5) && defined(_sigargs) /* Irix 5.x, not 6.x */ \
1773 || defined(HPUX)
1774 (void) sigaction(SIGBUS, &old_bus_act, 0);
1775 # endif
1776 # else
1777 (void) signal(SIGSEGV, old_segv_handler);
1778 # ifdef SIGBUS
1779 (void) signal(SIGBUS, old_bus_handler);
1780 # endif
1781 # endif
1782 }
1783
1784 /* Single argument version, robust against whole program analysis. */
1785 static void
1786 GC_noop1(x)
1787 word x;
1788 {
1789 static VOLATILE word sink;
1790 sink = x;
1791 }
1792
1793 /* Return the first nonaddressible location > p (up) or */
1794 /* the smallest location q s.t. [q,p] is addressible (!up). */
1795 static ptr_t GC_find_limit(p, up)
1796 ptr_t p;
1797 GC_bool up;
1798 {
1799 static VOLATILE ptr_t result;
1800 /* Needs to be static, since otherwise it may not be */
1801 /* preserved across the longjmp. Can safely be */
1802 /* static since it's only called once, with the */
1803 /* allocation lock held. */
1804
1805
1806 GC_setup_temporary_fault_handler();
1807 if (setjmp(GC_jmp_buf) == 0) {
1808 result = (ptr_t)(((word)(p))
1809 & ~(MIN_PAGE_SIZE-1));
1810 for (;;) {
1811 if (up) {
1812 result += MIN_PAGE_SIZE;
1813 } else {
1814 result -= MIN_PAGE_SIZE;
1815 }
1816 GC_noop1((word)(*result));
1817 }
1818 }
1819 GC_reset_fault_handler();
1820 if (!up) {
1821 result += MIN_PAGE_SIZE;
1822 }
1823 return(result);
1824 }
1825
1826 # endif
1827
1828 #ifdef LINUX_STACKBOTTOM
1829
1830 #include <sys/types.h>
1831 #include <sys/stat.h>
1832 #include <fcntl.h>
1833
1834 # define STAT_SKIP 27 /* Number of fields preceding startstack */
1835 /* field in /proc/self/stat */
1836
1837 static ptr_t GC_linux_stack_base(void)
1838 {
1839 /* We read the stack base value from /proc/self/stat. We do this */
1840 /* using direct I/O system calls in order to avoid calling malloc */
1841 /* in case REDIRECT_MALLOC is defined. */
1842 # define STAT_BUF_SIZE 4096
1843 # ifdef USE_LD_WRAP
1844 # define STAT_READ __real_read
1845 # else
1846 # define STAT_READ read
1847 # endif
1848 char stat_buf[STAT_BUF_SIZE];
1849 int f;
1850 char c;
1851 word result = 0;
1852 size_t i, buf_offset = 0;
1853
1854 f = open("/proc/self/stat", O_RDONLY);
1855 if (f < 0 || STAT_READ(f, stat_buf, STAT_BUF_SIZE) < 2 * STAT_SKIP) {
1856 ABORT("Couldn't read /proc/self/stat");
1857 }
1858 c = stat_buf[buf_offset++];
1859 /* Skip the required number of fields. This number is hopefully */
1860 /* constant across all Linux implementations. */
1861 for (i = 0; i < STAT_SKIP; ++i) {
1862 while (isspace(c)) c = stat_buf[buf_offset++];
1863 while (!isspace(c)) c = stat_buf[buf_offset++];
1864 }
1865 while (isspace(c)) c = stat_buf[buf_offset++];
1866 while (isdigit(c)) {
1867 result *= 10;
1868 result += c - '0';
1869 c = stat_buf[buf_offset++];
1870 }
1871 close(f);
1872 if (result < 0x10000000) ABORT("Absurd stack bottom value");
1873 return (ptr_t)result;
1874 }
1875
1876 #endif /* LINUX_STACKBOTTOM */
1877
1878 void *scm_get_stack_base()
1879 {
1880 word dummy;
1881 void *result = &dummy; /* initialize to silence compiler */
1882
1883 # define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
1884
1885 # ifdef STACKBOTTOM
1886 return(STACKBOTTOM);
1887 # else
1888 # ifdef HEURISTIC1
1889 # if STACK_GROWS_DOWN
1890 result = (ptr_t)((((word)(&dummy))
1891 + STACKBOTTOM_ALIGNMENT_M1)
1892 & ~STACKBOTTOM_ALIGNMENT_M1);
1893 # else
1894 result = (ptr_t)(((word)(&dummy))
1895 & ~STACKBOTTOM_ALIGNMENT_M1);
1896 # endif
1897 # endif /* HEURISTIC1 */
1898 # ifdef LINUX_STACKBOTTOM
1899 result = GC_linux_stack_base();
1900 # endif
1901 # ifdef HEURISTIC2
1902 # if STACK_GROWS_DOWN
1903 result = GC_find_limit((ptr_t)(&dummy), TRUE);
1904 # ifdef HEURISTIC2_LIMIT
1905 if (result > HEURISTIC2_LIMIT
1906 && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
1907 result = HEURISTIC2_LIMIT;
1908 }
1909 # endif
1910 # else
1911 result = GC_find_limit((ptr_t)(&dummy), FALSE);
1912 # ifdef HEURISTIC2_LIMIT
1913 if (result < HEURISTIC2_LIMIT
1914 && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
1915 result = HEURISTIC2_LIMIT;
1916 }
1917 # endif
1918 # endif
1919
1920 # endif /* HEURISTIC2 */
1921 # if STACK_GROWS_DOWN
1922 if (result == 0) result = (ptr_t)(signed_word)(-sizeof(ptr_t));
1923 # endif
1924 return(result);
1925 # endif /* STACKBOTTOM */
1926 }
1927
1928 # endif /* ! AMIGA */
1929 # endif /* ! OS2 */
1930 # endif /* ! MSWIN32 */
1931
1932 #endif /* mach_type_known */
1933 #endif /* ! HAVE_LIBC_STACK_END */
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