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Merge from mainline
[official-gcc.git] / boehm-gc / include / private / gcconfig.h
blobc028e5dbf6cff8d028cce52f7de8a2dab00e19bf
1 /*
2 * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
3 * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
4 * Copyright (c) 1996 by Silicon Graphics. All rights reserved.
5 * Copyright (c) 2000-2004 Hewlett-Packard Development Company, L.P.
6 *
7 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
8 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
9 *
10 * Permission is hereby granted to use or copy this program
11 * for any purpose, provided the above notices are retained on all copies.
12 * Permission to modify the code and to distribute modified code is granted,
13 * provided the above notices are retained, and a notice that the code was
14 * modified is included with the above copyright notice.
15 */
16
17 /*
18 * This header is private to the gc. It is almost always included from
19 * gc_priv.h. However it is possible to include it by itself if just the
20 * configuration macros are needed. In that
21 * case, a few declarations relying on types declared in gc_priv.h will be
22 * omitted.
23 */
24
25 #ifndef GCCONFIG_H
26
27 # define GCCONFIG_H
28
29 # ifndef GC_PRIVATE_H
30 /* Fake ptr_t declaration, just to avoid compilation errors. */
31 /* This avoids many instances if "ifndef GC_PRIVATE_H" below. */
32 typedef struct GC_undefined_struct * ptr_t;
33 # endif
34
35 /* Machine dependent parameters. Some tuning parameters can be found */
36 /* near the top of gc_private.h. */
37
38 /* Machine specific parts contributed by various people. See README file. */
39
40 /* First a unified test for Linux: */
41 # if defined(linux) || defined(__linux__)
42 # ifndef LINUX
43 # define LINUX
44 # endif
45 # endif
46
47 /* And one for NetBSD: */
48 # if defined(__NetBSD__)
49 # define NETBSD
50 # endif
51
52 /* And one for OpenBSD: */
53 # if defined(__OpenBSD__)
54 # define OPENBSD
55 # endif
56
57 /* And one for FreeBSD: */
58 # if defined(__FreeBSD__) && !defined(FREEBSD)
59 # define FREEBSD
60 # endif
61
62 /* Determine the machine type: */
63 # if defined(__arm__) || defined(__thumb__)
64 # define ARM32
65 # if !defined(LINUX) && !defined(NETBSD)
66 # define NOSYS
67 # define mach_type_known
68 # endif
69 # endif
70 # if defined(sun) && defined(mc68000)
71 # define M68K
72 # define SUNOS4
73 # define mach_type_known
74 # endif
75 # if defined(hp9000s300)
76 # define M68K
77 # define HP
78 # define mach_type_known
79 # endif
80 # if defined(OPENBSD) && defined(m68k)
81 # define M68K
82 # define mach_type_known
83 # endif
84 # if defined(OPENBSD) && defined(__sparc__)
85 # define SPARC
86 # define mach_type_known
87 # endif
88 # if defined(NETBSD) && (defined(m68k) || defined(__m68k__))
89 # define M68K
90 # define mach_type_known
91 # endif
92 # if defined(NETBSD) && defined(__powerpc__)
93 # define POWERPC
94 # define mach_type_known
95 # endif
96 # if defined(NETBSD) && (defined(__arm32__) || defined(__arm__))
97 # define ARM32
98 # define mach_type_known
99 # endif
100 # if defined(NETBSD) && defined(__sh__)
101 # define SH
102 # define mach_type_known
103 # endif
104 # if defined(vax)
105 # define VAX
106 # ifdef ultrix
107 # define ULTRIX
108 # else
109 # define BSD
110 # endif
111 # define mach_type_known
112 # endif
113 # if defined(__NetBSD__) && defined(__vax__)
114 # define VAX
115 # define mach_type_known
116 # endif
117 # if defined(mips) || defined(__mips) || defined(_mips)
118 # define MIPS
119 # if defined(nec_ews) || defined(_nec_ews)
120 # define EWS4800
121 # endif
122 # if !defined(LINUX) && !defined(EWS4800) && !defined(NETBSD)
123 # if defined(ultrix) || defined(__ultrix)
124 # define ULTRIX
125 # else
126 # if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \
127 || defined(__SYSTYPE_SVR4__)
128 # define IRIX5 /* or IRIX 6.X */
129 # else
130 # define RISCOS /* or IRIX 4.X */
131 # endif
132 # endif
133 # endif /* !LINUX */
134 # if defined(__NetBSD__) && defined(__MIPSEL__)
135 # undef ULTRIX
136 # endif
137 # define mach_type_known
138 # endif
139 # if defined(DGUX) && (defined(i386) || defined(__i386__))
140 # define I386
141 # ifndef _USING_DGUX
142 # define _USING_DGUX
143 # endif
144 # define mach_type_known
145 # endif
146 # if defined(sequent) && (defined(i386) || defined(__i386__))
147 # define I386
148 # define SEQUENT
149 # define mach_type_known
150 # endif
151 # if defined(sun) && (defined(i386) || defined(__i386__))
152 # define I386
153 # define SUNOS5
154 # define mach_type_known
155 # endif
156 # if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__)
157 # define I386
158 # define OS2
159 # define mach_type_known
160 # endif
161 # if defined(ibm032)
162 # define RT
163 # define mach_type_known
164 # endif
165 # if defined(sun) && (defined(sparc) || defined(__sparc))
166 # define SPARC
167 /* Test for SunOS 5.x */
168 # include <errno.h>
169 # ifdef ECHRNG
170 # define SUNOS5
171 # else
172 # define SUNOS4
173 # endif
174 # define mach_type_known
175 # endif
176 # if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \
177 && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__FreeBSD__)
178 # define SPARC
179 # define DRSNX
180 # define mach_type_known
181 # endif
182 # if defined(_IBMR2)
183 # define RS6000
184 # define mach_type_known
185 # endif
186 # if defined(__NetBSD__) && defined(__sparc__)
187 # define SPARC
188 # define mach_type_known
189 # endif
190 # if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386)
191 /* The above test may need refinement */
192 # define I386
193 # if defined(_SCO_ELF)
194 # define SCO_ELF
195 # else
196 # define SCO
197 # endif
198 # define mach_type_known
199 # endif
200 # if defined(_AUX_SOURCE)
201 # define M68K
202 # define SYSV
203 # define mach_type_known
204 # endif
205 # if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \
206 || defined(hppa) || defined(__hppa__)
207 # define HP_PA
208 # if !defined(LINUX) && !defined(HPUX)
209 # define HPUX
210 # endif
211 # define mach_type_known
212 # endif
213 # if defined(__ia64) && defined(_HPUX_SOURCE)
214 # define IA64
215 # ifndef HPUX
216 # define HPUX
217 # endif
218 # define mach_type_known
219 # endif
220 # if defined(__BEOS__) && defined(_X86_)
221 # define I386
222 # define BEOS
223 # define mach_type_known
224 # endif
225 # if defined(LINUX) && (defined(i386) || defined(__i386__))
226 # define I386
227 # define mach_type_known
228 # endif
229 # if defined(LINUX) && defined(__x86_64__)
230 # define X86_64
231 # define mach_type_known
232 # endif
233 # if defined(LINUX) && (defined(__ia64__) || defined(__ia64))
234 # define IA64
235 # define mach_type_known
236 # endif
237 # if defined(LINUX) && defined(__arm__)
238 # define ARM32
239 # define mach_type_known
240 # endif
241 # if defined(LINUX) && defined(__cris__)
242 # ifndef CRIS
243 # define CRIS
244 # endif
245 # define mach_type_known
246 # endif
247 # if defined(LINUX) && (defined(powerpc) || defined(__powerpc__) || \
248 defined(powerpc64) || defined(__powerpc64__))
249 # define POWERPC
250 # define mach_type_known
251 # endif
252 # if defined(FREEBSD) && (defined(powerpc) || defined(__powerpc__))
253 # define POWERPC
254 # define mach_type_known
255 # endif
256 # if defined(LINUX) && defined(__mc68000__)
257 # define M68K
258 # define mach_type_known
259 # endif
260 # if defined(LINUX) && (defined(sparc) || defined(__sparc__))
261 # define SPARC
262 # define mach_type_known
263 # endif
264 # if defined(LINUX) && defined(__arm__)
265 # define ARM32
266 # define mach_type_known
267 # endif
268 # if defined(LINUX) && defined(__sh__)
269 # define SH
270 # define mach_type_known
271 # endif
272 # if defined(LINUX) && defined(__m32r__)
273 # define M32R
274 # define mach_type_known
275 # endif
276 # if defined(__alpha) || defined(__alpha__)
277 # define ALPHA
278 # if !defined(LINUX) && !defined(NETBSD) && !defined(OPENBSD) && !defined(FREEBSD)
279 # define OSF1 /* a.k.a Digital Unix */
280 # endif
281 # define mach_type_known
282 # endif
283 # if defined(_AMIGA) && !defined(AMIGA)
284 # define AMIGA
285 # endif
286 # ifdef AMIGA
287 # define M68K
288 # define mach_type_known
289 # endif
290 # if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc)
291 # define M68K
292 # define MACOS
293 # define mach_type_known
294 # endif
295 # if defined(__MWERKS__) && defined(__powerc) && !defined(__MACH__)
296 # define POWERPC
297 # define MACOS
298 # define mach_type_known
299 # endif
300 # if defined(macosx) || (defined(__APPLE__) && defined(__MACH__))
301 # define DARWIN
302 # if defined(__ppc__) || defined(__ppc64__)
303 # define POWERPC
304 # define mach_type_known
305 # elif defined(__i386__)
306 # define I386
307 --> Not really supported, but at least we recognize it.
308 # endif
309 # endif
310 # if defined(NeXT) && defined(mc68000)
311 # define M68K
312 # define NEXT
313 # define mach_type_known
314 # endif
315 # if defined(NeXT) && (defined(i386) || defined(__i386__))
316 # define I386
317 # define NEXT
318 # define mach_type_known
319 # endif
320 # if defined(__OpenBSD__) && (defined(i386) || defined(__i386__))
321 # define I386
322 # define OPENBSD
323 # define mach_type_known
324 # endif
325 # if defined(FREEBSD) && (defined(i386) || defined(__i386__))
326 # define I386
327 # define mach_type_known
328 # endif
329 # if defined(__NetBSD__) && (defined(i386) || defined(__i386__))
330 # define I386
331 # define mach_type_known
332 # endif
333 # if defined(__NetBSD__) && defined(__x86_64__)
334 # define X86_64
335 # define mach_type_known
336 # endif
337 # if defined(FREEBSD) && defined(__sparc__)
338 # define SPARC
339 # define mach_type_known
340 #endif
341 # if defined(bsdi) && (defined(i386) || defined(__i386__))
342 # define I386
343 # define BSDI
344 # define mach_type_known
345 # endif
346 # if !defined(mach_type_known) && defined(__386BSD__)
347 # define I386
348 # define THREE86BSD
349 # define mach_type_known
350 # endif
351 # if defined(_CX_UX) && defined(_M88K)
352 # define M88K
353 # define CX_UX
354 # define mach_type_known
355 # endif
356 # if defined(DGUX) && defined(m88k)
357 # define M88K
358 /* DGUX defined */
359 # define mach_type_known
360 # endif
361 # if defined(_WIN32_WCE)
362 /* SH3, SH4, MIPS already defined for corresponding architectures */
363 # if defined(SH3) || defined(SH4)
364 # define SH
365 # endif
366 # if defined(x86)
367 # define I386
368 # endif
369 # if defined(ARM)
370 # define ARM32
371 # endif
372 # define MSWINCE
373 # define mach_type_known
374 # else
375 # if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \
376 || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
377 # define I386
378 # define MSWIN32 /* or Win32s */
379 # define mach_type_known
380 # endif
381 # if defined(_MSC_VER) && defined(_M_IA64)
382 # define IA64
383 # define MSWIN32 /* Really win64, but we don't treat 64-bit */
384 /* variants as a differnt platform. */
385 # endif
386 # endif
387 # if defined(__DJGPP__)
388 # define I386
389 # ifndef DJGPP
390 # define DJGPP /* MSDOS running the DJGPP port of GCC */
391 # endif
392 # define mach_type_known
393 # endif
394 # if defined(__CYGWIN32__) || defined(__CYGWIN__)
395 # define I386
396 # define CYGWIN32
397 # define mach_type_known
398 # endif
399 # if defined(__MINGW32__)
400 # define I386
401 # define MSWIN32
402 # define mach_type_known
403 # endif
404 # if defined(__BORLANDC__)
405 # define I386
406 # define MSWIN32
407 # define mach_type_known
408 # endif
409 # if defined(_UTS) && !defined(mach_type_known)
410 # define S370
411 # define UTS4
412 # define mach_type_known
413 # endif
414 # if defined(__pj__)
415 # define PJ
416 # define mach_type_known
417 # endif
418 # if defined(__embedded__) && defined(PPC)
419 # define POWERPC
420 # define NOSYS
421 # define mach_type_known
422 # endif
423 /* Ivan Demakov */
424 # if defined(__WATCOMC__) && defined(__386__)
425 # define I386
426 # if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW)
427 # if defined(__OS2__)
428 # define OS2
429 # else
430 # if defined(__WINDOWS_386__) || defined(__NT__)
431 # define MSWIN32
432 # else
433 # define DOS4GW
434 # endif
435 # endif
436 # endif
437 # define mach_type_known
438 # endif
439 # if defined(__s390__) && defined(LINUX)
440 # define S390
441 # define mach_type_known
442 # endif
443 # if defined(__GNU__)
444 # if defined(__i386__)
445 /* The Debian Hurd running on generic PC */
446 # define HURD
447 # define I386
448 # define mach_type_known
449 # endif
450 # endif
451
452 /* Feel free to add more clauses here */
453
454 /* Or manually define the machine type here. A machine type is */
455 /* characterized by the architecture. Some */
456 /* machine types are further subdivided by OS. */
457 /* the macros ULTRIX, RISCOS, and BSD to distinguish. */
458 /* Note that SGI IRIX is treated identically to RISCOS. */
459 /* SYSV on an M68K actually means A/UX. */
460 /* The distinction in these cases is usually the stack starting address */
461 # ifndef mach_type_known
462 --> unknown machine type
463 # endif
464 /* Mapping is: M68K ==> Motorola 680X0 */
465 /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */
466 /* MACOS and AMIGA variants) */
467 /* I386 ==> Intel 386 */
468 /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */
469 /* FREEBSD, THREE86BSD, MSWIN32, */
470 /* BSDI,SUNOS5, NEXT, other variants) */
471 /* NS32K ==> Encore Multimax */
472 /* MIPS ==> R2000 or R3000 */
473 /* (RISCOS, ULTRIX variants) */
474 /* VAX ==> DEC VAX */
475 /* (BSD, ULTRIX variants) */
476 /* RS6000 ==> IBM RS/6000 AIX3.X */
477 /* RT ==> IBM PC/RT */
478 /* HP_PA ==> HP9000/700 & /800 */
479 /* HP/UX, LINUX */
480 /* SPARC ==> SPARC v7/v8/v9 */
481 /* (SUNOS4, SUNOS5, LINUX, */
482 /* DRSNX variants) */
483 /* ALPHA ==> DEC Alpha */
484 /* (OSF1 and LINUX variants) */
485 /* M88K ==> Motorola 88XX0 */
486 /* (CX_UX and DGUX) */
487 /* S370 ==> 370-like machine */
488 /* running Amdahl UTS4 */
489 /* S390 ==> 390-like machine */
490 /* running LINUX */
491 /* ARM32 ==> Intel StrongARM */
492 /* IA64 ==> Intel IPF */
493 /* (e.g. Itanium) */
494 /* (LINUX and HPUX) */
495 /* SH ==> Hitachi SuperH */
496 /* (LINUX & MSWINCE) */
497 /* X86_64 ==> AMD x86-64 */
498 /* POWERPC ==> IBM/Apple PowerPC */
499 /* (MACOS(<=9),DARWIN(incl.MACOSX),*/
500 /* LINUX, NETBSD, NOSYS variants) */
501 /* Handles 32 and 64-bit variants. */
502 /* AIX should be handled here, but */
503 /* that's called an RS6000. */
504 /* CRIS ==> Axis Etrax */
505 /* M32R ==> Renesas M32R */
506
507
508 /*
509 * For each architecture and OS, the following need to be defined:
510 *
511 * CPP_WORDSZ is a simple integer constant representing the word size.
512 * in bits. We assume byte addressibility, where a byte has 8 bits.
513 * We also assume CPP_WORDSZ is either 32 or 64.
514 * (We care about the length of pointers, not hardware
515 * bus widths. Thus a 64 bit processor with a C compiler that uses
516 * 32 bit pointers should use CPP_WORDSZ of 32, not 64. Default is 32.)
517 *
518 * MACH_TYPE is a string representation of the machine type.
519 * OS_TYPE is analogous for the OS.
520 *
521 * ALIGNMENT is the largest N, such that
522 * all pointer are guaranteed to be aligned on N byte boundaries.
523 * defining it to be 1 will always work, but perform poorly.
524 *
525 * DATASTART is the beginning of the data segment.
526 * On some platforms SEARCH_FOR_DATA_START is defined.
527 * SEARCH_FOR_DATASTART will cause GC_data_start to
528 * be set to an address determined by accessing data backwards from _end
529 * until an unmapped page is found. DATASTART will be defined to be
530 * GC_data_start.
531 * On UNIX-like systems, the collector will scan the area between DATASTART
532 * and DATAEND for root pointers.
533 *
534 * DATAEND, if not `end' where `end' is defined as ``extern int end[];''.
535 * RTH suggests gaining access to linker script synth'd values with
536 * this idiom instead of `&end' where `end' is defined as ``extern int end;'' .
537 * Otherwise, ``GCC will assume these are in .sdata/.sbss'' and it will, e.g.,
538 * cause failures on alpha*-*-* with ``-msmall-data or -fpic'' or mips-*-*
539 * without any special options.
540 *
541 * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice
542 * the pointer size.
543 *
544 * STACKBOTTOM is the cool end of the stack, which is usually the
545 * highest address in the stack.
546 * Under PCR or OS/2, we have other ways of finding thread stacks.
547 * For each machine, the following should:
548 * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and
549 * 2) define exactly one of
550 * STACKBOTTOM (should be defined to be an expression)
551 * LINUX_STACKBOTTOM
552 * HEURISTIC1
553 * HEURISTIC2
554 * If STACKBOTTOM is defined, then it's value will be used directly as the
555 * stack base. If LINUX_STACKBOTTOM is defined, then it will be determined
556 * with a method appropriate for most Linux systems. Currently we look
557 * first for __libc_stack_end, and if that fails read it from /proc.
558 * If either of the last two macros are defined, then STACKBOTTOM is computed
559 * during collector startup using one of the following two heuristics:
560 * HEURISTIC1: Take an address inside GC_init's frame, and round it up to
561 * the next multiple of STACK_GRAN.
562 * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly
563 * in small steps (decrement if STACK_GROWS_UP), and read the value
564 * at each location. Remember the value when the first
565 * Segmentation violation or Bus error is signalled. Round that
566 * to the nearest plausible page boundary, and use that instead
567 * of STACKBOTTOM.
568 *
569 * Gustavo Rodriguez-Rivera points out that on most (all?) Unix machines,
570 * the value of environ is a pointer that can serve as STACKBOTTOM.
571 * I expect that HEURISTIC2 can be replaced by this approach, which
572 * interferes far less with debugging. However it has the disadvantage
573 * that it's confused by a putenv call before the collector is initialized.
574 * This could be dealt with by intercepting putenv ...
575 *
576 * If no expression for STACKBOTTOM can be found, and neither of the above
577 * heuristics are usable, the collector can still be used with all of the above
578 * undefined, provided one of the following is done:
579 * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s)
580 * without reference to STACKBOTTOM. This is appropriate for use in
581 * conjunction with thread packages, since there will be multiple stacks.
582 * (Allocating thread stacks in the heap, and treating them as ordinary
583 * heap data objects is also possible as a last resort. However, this is
584 * likely to introduce significant amounts of excess storage retention
585 * unless the dead parts of the thread stacks are periodically cleared.)
586 * 2) Client code may set GC_stackbottom before calling any GC_ routines.
587 * If the author of the client code controls the main program, this is
588 * easily accomplished by introducing a new main program, setting
589 * GC_stackbottom to the address of a local variable, and then calling
590 * the original main program. The new main program would read something
591 * like:
592 *
593 * # include "gc_private.h"
594 *
595 * main(argc, argv, envp)
596 * int argc;
597 * char **argv, **envp;
598 * {
599 * int dummy;
600 *
601 * GC_stackbottom = (ptr_t)(&dummy);
602 * return(real_main(argc, argv, envp));
603 * }
604 *
605 *
606 * Each architecture may also define the style of virtual dirty bit
607 * implementation to be used:
608 * MPROTECT_VDB: Write protect the heap and catch faults.
609 * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits.
610 *
611 * An architecture may define DYNAMIC_LOADING if dynamic_load.c
612 * defined GC_register_dynamic_libraries() for the architecture.
613 *
614 * An architecture may define PREFETCH(x) to preload the cache with *x.
615 * This defaults to a no-op.
616 *
617 * PREFETCH_FOR_WRITE(x) is used if *x is about to be written.
618 *
619 * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to
620 * clear the two words at GC_malloc-aligned address x. By default,
621 * word stores of 0 are used instead.
622 *
623 * HEAP_START may be defined as the initial address hint for mmap-based
624 * allocation.
625 */
626
627 /* If we are using a recent version of gcc, we can use __builtin_unwind_init()
628 * to push the relevant registers onto the stack. This generally makes
629 * USE_GENERIC_PUSH_REGS the preferred approach for marking from registers.
630 */
631 # if defined(__GNUC__) && ((__GNUC__ >= 3) || \
632 (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)) \
633 && !defined(__INTEL_COMPILER) \
634 && !defined(__PATHCC__)
635 # define HAVE_BUILTIN_UNWIND_INIT
636 # endif
637
638 # define STACK_GRAN 0x1000000
639 # ifdef M68K
640 # define MACH_TYPE "M68K"
641 # define ALIGNMENT 2
642 # ifdef OPENBSD
643 # define OS_TYPE "OPENBSD"
644 # define HEURISTIC2
645 # ifdef __ELF__
646 # define DATASTART GC_data_start
647 # define DYNAMIC_LOADING
648 # else
649 extern char etext[];
650 # define DATASTART ((ptr_t)(etext))
651 # endif
652 # define USE_GENERIC_PUSH_REGS
653 # endif
654 # ifdef NETBSD
655 # define OS_TYPE "NETBSD"
656 # define HEURISTIC2
657 # ifdef __ELF__
658 # define DATASTART GC_data_start
659 # define DYNAMIC_LOADING
660 # else
661 extern char etext[];
662 # define DATASTART ((ptr_t)(etext))
663 # endif
664 # define USE_GENERIC_PUSH_REGS
665 # endif
666 # ifdef LINUX
667 # define OS_TYPE "LINUX"
668 # define STACKBOTTOM ((ptr_t)0xf0000000)
669 # define USE_GENERIC_PUSH_REGS
670 /* We never got around to the assembly version. */
671 /* # define MPROTECT_VDB - Reported to not work 9/17/01 */
672 # ifdef __ELF__
673 # define DYNAMIC_LOADING
674 # include <features.h>
675 # if defined(__GLIBC__)&& __GLIBC__>=2
676 # define SEARCH_FOR_DATA_START
677 # else /* !GLIBC2 */
678 extern char **__environ;
679 # define DATASTART ((ptr_t)(&__environ))
680 /* hideous kludge: __environ is the first */
681 /* word in crt0.o, and delimits the start */
682 /* of the data segment, no matter which */
683 /* ld options were passed through. */
684 /* We could use _etext instead, but that */
685 /* would include .rodata, which may */
686 /* contain large read-only data tables */
687 /* that we'd rather not scan. */
688 # endif /* !GLIBC2 */
689 extern int _end[];
690 # define DATAEND (_end)
691 # else
692 extern int etext[];
693 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
694 # endif
695 # endif
696 # ifdef SUNOS4
697 # define OS_TYPE "SUNOS4"
698 extern char etext[];
699 # define DATASTART ((ptr_t)((((word) (etext)) + 0x1ffff) & ~0x1ffff))
700 # define HEURISTIC1 /* differs */
701 # define DYNAMIC_LOADING
702 # endif
703 # ifdef HP
704 # define OS_TYPE "HP"
705 extern char etext[];
706 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
707 # define STACKBOTTOM ((ptr_t) 0xffeffffc)
708 /* empirically determined. seems to work. */
709 # include <unistd.h>
710 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
711 # endif
712 # ifdef SYSV
713 # define OS_TYPE "SYSV"
714 extern etext[];
715 # define DATASTART ((ptr_t)((((word) (etext)) + 0x3fffff) \
716 & ~0x3fffff) \
717 +((word)etext & 0x1fff))
718 /* This only works for shared-text binaries with magic number 0413.
719 The other sorts of SysV binaries put the data at the end of the text,
720 in which case the default of etext would work. Unfortunately,
721 handling both would require having the magic-number available.
722 -- Parag
723 */
724 # define STACKBOTTOM ((ptr_t)0xFFFFFFFE)
725 /* The stack starts at the top of memory, but */
726 /* 0x0 cannot be used as setjump_test complains */
727 /* that the stack direction is incorrect. Two */
728 /* bytes down from 0x0 should be safe enough. */
729 /* --Parag */
730 # include <sys/mmu.h>
731 # define GETPAGESIZE() PAGESIZE /* Is this still right? */
732 # endif
733 # ifdef AMIGA
734 # define OS_TYPE "AMIGA"
735 /* STACKBOTTOM and DATASTART handled specially */
736 /* in os_dep.c */
737 # define DATAEND /* not needed */
738 # define GETPAGESIZE() 4096
739 # endif
740 # ifdef MACOS
741 # ifndef __LOWMEM__
742 # include <LowMem.h>
743 # endif
744 # define OS_TYPE "MACOS"
745 /* see os_dep.c for details of global data segments. */
746 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
747 # define DATAEND /* not needed */
748 # define GETPAGESIZE() 4096
749 # endif
750 # ifdef NEXT
751 # define OS_TYPE "NEXT"
752 # define DATASTART ((ptr_t) get_etext())
753 # define STACKBOTTOM ((ptr_t) 0x4000000)
754 # define DATAEND /* not needed */
755 # endif
756 # endif
757
758 # if defined(POWERPC)
759 # define MACH_TYPE "POWERPC"
760 # ifdef MACOS
761 # define ALIGNMENT 2 /* Still necessary? Could it be 4? */
762 # ifndef __LOWMEM__
763 # include <LowMem.h>
764 # endif
765 # define OS_TYPE "MACOS"
766 /* see os_dep.c for details of global data segments. */
767 # define STACKBOTTOM ((ptr_t) LMGetCurStackBase())
768 # define DATAEND /* not needed */
769 # endif
770 # ifdef LINUX
771 # if defined(__powerpc64__)
772 # define ALIGNMENT 8
773 # define CPP_WORDSZ 64
774 # ifndef HBLKSIZE
775 # define HBLKSIZE 4096
776 # endif
777 # else
778 # define ALIGNMENT 4
779 # endif
780 # define OS_TYPE "LINUX"
781 /* HEURISTIC1 has been reliably reported to fail for a 32-bit */
782 /* executable on a 64 bit kernel. */
783 # define LINUX_STACKBOTTOM
784 # define DYNAMIC_LOADING
785 # define SEARCH_FOR_DATA_START
786 extern int _end[];
787 # define DATAEND (_end)
788 # endif
789 # ifdef DARWIN
790 # ifdef __ppc64__
791 # define ALIGNMENT 8
792 # define CPP_WORDSZ 64
793 # else
794 # define ALIGNMENT 4
795 # endif
796 # define OS_TYPE "DARWIN"
797 # define DYNAMIC_LOADING
798 /* XXX: see get_end(3), get_etext() and get_end() should not be used.
799 These aren't used when dyld support is enabled (it is by default) */
800 # define DATASTART ((ptr_t) get_etext())
801 # define DATAEND ((ptr_t) get_end())
802 # define STACKBOTTOM ((ptr_t) 0xc0000000)
803 # define USE_MMAP
804 # define USE_MMAP_ANON
805 # define USE_ASM_PUSH_REGS
806 /* This is potentially buggy. It needs more testing. See the comments in
807 os_dep.c. It relies on threads to track writes. */
808 # ifdef GC_DARWIN_THREADS
809 /* # define MPROTECT_VDB -- diabled for now. May work for some apps. */
810 # endif
811 # include <unistd.h>
812 # define GETPAGESIZE() getpagesize()
813 # if defined(USE_PPC_PREFETCH) && defined(__GNUC__)
814 /* The performance impact of prefetches is untested */
815 # define PREFETCH(x) \
816 __asm__ __volatile__ ("dcbt 0,%0" : : "r" ((const void *) (x)))
817 # define PREFETCH_FOR_WRITE(x) \
818 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" ((const void *) (x)))
819 # endif
820 /* There seems to be some issues with trylock hanging on darwin. This
821 should be looked into some more */
822 # define NO_PTHREAD_TRYLOCK
823 # endif
824 # ifdef FREEBSD
825 # define ALIGNMENT 4
826 # define OS_TYPE "FREEBSD"
827 # ifndef GC_FREEBSD_THREADS
828 # define MPROTECT_VDB
829 # endif
830 # define SIG_SUSPEND SIGUSR1
831 # define SIG_THR_RESTART SIGUSR2
832 # define FREEBSD_STACKBOTTOM
833 # ifdef __ELF__
834 # define DYNAMIC_LOADING
835 # endif
836 extern char etext[];
837 extern char * GC_FreeBSDGetDataStart();
838 # define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
839 # endif
840 # ifdef NETBSD
841 # define ALIGNMENT 4
842 # define OS_TYPE "NETBSD"
843 # define HEURISTIC2
844 extern char etext[];
845 # define DATASTART GC_data_start
846 # define DYNAMIC_LOADING
847 # endif
848 # ifdef NOSYS
849 # define ALIGNMENT 4
850 # define OS_TYPE "NOSYS"
851 extern void __end[], __dso_handle[];
852 # define DATASTART (__dso_handle) /* OK, that's ugly. */
853 # define DATAEND (__end)
854 /* Stack starts at 0xE0000000 for the simulator. */
855 # undef STACK_GRAN
856 # define STACK_GRAN 0x10000000
857 # define HEURISTIC1
858 # endif
859 # endif
860
861 # ifdef VAX
862 # define MACH_TYPE "VAX"
863 # define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */
864 extern char etext[];
865 # define DATASTART ((ptr_t)(etext))
866 # ifdef BSD
867 # define OS_TYPE "BSD"
868 # define HEURISTIC1
869 /* HEURISTIC2 may be OK, but it's hard to test. */
870 # endif
871 # ifdef ULTRIX
872 # define OS_TYPE "ULTRIX"
873 # define STACKBOTTOM ((ptr_t) 0x7fffc800)
874 # endif
875 # endif
876
877 # ifdef RT
878 # define MACH_TYPE "RT"
879 # define ALIGNMENT 4
880 # define DATASTART ((ptr_t) 0x10000000)
881 # define STACKBOTTOM ((ptr_t) 0x1fffd800)
882 # endif
883
884 # ifdef SPARC
885 # define MACH_TYPE "SPARC"
886 # if defined(__arch64__) || defined(__sparcv9)
887 # define ALIGNMENT 8
888 # define CPP_WORDSZ 64
889 # define ELF_CLASS ELFCLASS64
890 # else
891 # define ALIGNMENT 4 /* Required by hardware */
892 # define CPP_WORDSZ 32
893 # endif
894 # define ALIGN_DOUBLE
895 # ifdef SUNOS5
896 # define OS_TYPE "SUNOS5"
897 extern int _etext[];
898 extern int _end[];
899 extern ptr_t GC_SysVGetDataStart();
900 # define DATASTART GC_SysVGetDataStart(0x10000, _etext)
901 # define DATAEND (_end)
902 # if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
903 # define USE_MMAP
904 /* Otherwise we now use calloc. Mmap may result in the */
905 /* heap interleaved with thread stacks, which can result in */
906 /* excessive blacklisting. Sbrk is unusable since it */
907 /* doesn't interact correctly with the system malloc. */
908 # endif
909 # ifdef USE_MMAP
910 # define HEAP_START (ptr_t)0x40000000
911 # else
912 # define HEAP_START DATAEND
913 # endif
914 # define PROC_VDB
915 /* HEURISTIC1 reportedly no longer works under 2.7. */
916 /* HEURISTIC2 probably works, but this appears to be preferable. */
917 /* Apparently USRSTACK is defined to be USERLIMIT, but in some */
918 /* installations that's undefined. We work around this with a */
919 /* gross hack: */
920 # include <sys/vmparam.h>
921 # ifdef USERLIMIT
922 /* This should work everywhere, but doesn't. */
923 # define STACKBOTTOM USRSTACK
924 # else
925 # define HEURISTIC2
926 # endif
927 # include <unistd.h>
928 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
929 /* getpagesize() appeared to be missing from at least one */
930 /* Solaris 5.4 installation. Weird. */
931 # define DYNAMIC_LOADING
932 # endif
933 # ifdef SUNOS4
934 # define OS_TYPE "SUNOS4"
935 /* [If you have a weak stomach, don't read this.] */
936 /* We would like to use: */
937 /* # define DATASTART ((ptr_t)((((word) (etext)) + 0x1fff) & ~0x1fff)) */
938 /* This fails occasionally, due to an ancient, but very */
939 /* persistent ld bug. etext is set 32 bytes too high. */
940 /* We instead read the text segment size from the a.out */
941 /* header, which happens to be mapped into our address space */
942 /* at the start of the text segment. The detective work here */
943 /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */
944 /* Serpette of INRIA. */
945 /* This assumes ZMAGIC, i.e. demand-loadable executables. */
946 # define TEXTSTART 0x2000
947 # define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART))
948 # define MPROTECT_VDB
949 # define HEURISTIC1
950 # define DYNAMIC_LOADING
951 # endif
952 # ifdef DRSNX
953 # define OS_TYPE "DRSNX"
954 extern ptr_t GC_SysVGetDataStart();
955 extern int etext[];
956 # define DATASTART GC_SysVGetDataStart(0x10000, etext)
957 # define MPROTECT_VDB
958 # define STACKBOTTOM ((ptr_t) 0xdfff0000)
959 # define DYNAMIC_LOADING
960 # endif
961 # ifdef LINUX
962 # define OS_TYPE "LINUX"
963 # ifdef __ELF__
964 # define DYNAMIC_LOADING
965 # else
966 Linux Sparc/a.out not supported
967 # endif
968 extern int _end[];
969 extern int _etext[];
970 # define DATAEND (_end)
971 # define SVR4
972 extern ptr_t GC_SysVGetDataStart();
973 # ifdef __arch64__
974 # define DATASTART GC_SysVGetDataStart(0x100000, _etext)
975 # else
976 # define DATASTART GC_SysVGetDataStart(0x10000, _etext)
977 # endif
978 # define LINUX_STACKBOTTOM
979 # endif
980 # ifdef OPENBSD
981 # define OS_TYPE "OPENBSD"
982 # define STACKBOTTOM ((ptr_t) 0xf8000000)
983 extern int etext[];
984 # define DATASTART ((ptr_t)(etext))
985 # endif
986 # ifdef NETBSD
987 # define OS_TYPE "NETBSD"
988 # define HEURISTIC2
989 # ifdef __ELF__
990 # define DATASTART GC_data_start
991 # define DYNAMIC_LOADING
992 # else
993 extern char etext[];
994 # define DATASTART ((ptr_t)(etext))
995 # endif
996 # endif
997 # ifdef FREEBSD
998 # define OS_TYPE "FREEBSD"
999 # define SIG_SUSPEND SIGUSR1
1000 # define SIG_THR_RESTART SIGUSR2
1001 # define FREEBSD_STACKBOTTOM
1002 # ifdef __ELF__
1003 # define DYNAMIC_LOADING
1004 # endif
1005 extern char etext[];
1006 extern char edata[];
1007 extern char end[];
1008 # define NEED_FIND_LIMIT
1009 # define DATASTART ((ptr_t)(&etext))
1010 # define DATAEND (GC_find_limit (DATASTART, TRUE))
1011 # define DATASTART2 ((ptr_t)(&edata))
1012 # define DATAEND2 ((ptr_t)(&end))
1013 # endif
1014 # endif
1015
1016 # ifdef I386
1017 # define MACH_TYPE "I386"
1018 # if defined(__LP64__) || defined(_WIN64)
1019 # define CPP_WORDSZ 64
1020 # define ALIGNMENT 8
1021 # else
1022 # define CPP_WORDSZ 32
1023 # define ALIGNMENT 4
1024 /* Appears to hold for all "32 bit" compilers */
1025 /* except Borland. The -a4 option fixes */
1026 /* Borland. */
1027 /* Ivan Demakov: For Watcom the option is -zp4. */
1028 # endif
1029 # ifndef SMALL_CONFIG
1030 # define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */
1031 /* improvement on Pentiums. */
1032 # endif
1033 # ifdef HAVE_BUILTIN_UNWIND_INIT
1034 # define USE_GENERIC_PUSH_REGS
1035 # endif
1036 # ifdef SEQUENT
1037 # define OS_TYPE "SEQUENT"
1038 extern int etext[];
1039 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1040 # define STACKBOTTOM ((ptr_t) 0x3ffff000)
1041 # endif
1042 # ifdef BEOS
1043 # define OS_TYPE "BEOS"
1044 # include <OS.h>
1045 # define GETPAGESIZE() B_PAGE_SIZE
1046 extern int etext[];
1047 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1048 # endif
1049 # ifdef SUNOS5
1050 # define OS_TYPE "SUNOS5"
1051 extern int _etext[], _end[];
1052 extern ptr_t GC_SysVGetDataStart();
1053 # define DATASTART GC_SysVGetDataStart(0x1000, _etext)
1054 # define DATAEND (_end)
1055 /* # define STACKBOTTOM ((ptr_t)(_start)) worked through 2.7, */
1056 /* but reportedly breaks under 2.8. It appears that the stack */
1057 /* base is a property of the executable, so this should not break */
1058 /* old executables. */
1059 /* HEURISTIC2 probably works, but this appears to be preferable. */
1060 # include <sys/vm.h>
1061 # define STACKBOTTOM USRSTACK
1062 /* At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */
1063 /* It appears to be fixed in 2.8 and 2.9. */
1064 # ifdef SOLARIS25_PROC_VDB_BUG_FIXED
1065 # define PROC_VDB
1066 # endif
1067 # define DYNAMIC_LOADING
1068 # if !defined(USE_MMAP) && defined(REDIRECT_MALLOC)
1069 # define USE_MMAP
1070 /* Otherwise we now use calloc. Mmap may result in the */
1071 /* heap interleaved with thread stacks, which can result in */
1072 /* excessive blacklisting. Sbrk is unusable since it */
1073 /* doesn't interact correctly with the system malloc. */
1074 # endif
1075 # ifdef USE_MMAP
1076 # define HEAP_START (ptr_t)0x40000000
1077 # else
1078 # define HEAP_START DATAEND
1079 # endif
1080 # endif
1081 # ifdef SCO
1082 # define OS_TYPE "SCO"
1083 extern int etext[];
1084 # define DATASTART ((ptr_t)((((word) (etext)) + 0x3fffff) \
1085 & ~0x3fffff) \
1086 +((word)etext & 0xfff))
1087 # define STACKBOTTOM ((ptr_t) 0x7ffffffc)
1088 # endif
1089 # ifdef SCO_ELF
1090 # define OS_TYPE "SCO_ELF"
1091 extern int etext[];
1092 # define DATASTART ((ptr_t)(etext))
1093 # define STACKBOTTOM ((ptr_t) 0x08048000)
1094 # define DYNAMIC_LOADING
1095 # define ELF_CLASS ELFCLASS32
1096 # endif
1097 # ifdef DGUX
1098 # define OS_TYPE "DGUX"
1099 extern int _etext, _end;
1100 extern ptr_t GC_SysVGetDataStart();
1101 # define DATASTART GC_SysVGetDataStart(0x1000, &_etext)
1102 # define DATAEND (&_end)
1103 # define STACK_GROWS_DOWN
1104 # define HEURISTIC2
1105 # include <unistd.h>
1106 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
1107 # define DYNAMIC_LOADING
1108 # ifndef USE_MMAP
1109 # define USE_MMAP
1110 # endif /* USE_MMAP */
1111 # define MAP_FAILED (void *) -1
1112 # ifdef USE_MMAP
1113 # define HEAP_START (ptr_t)0x40000000
1114 # else /* USE_MMAP */
1115 # define HEAP_START DATAEND
1116 # endif /* USE_MMAP */
1117 # endif /* DGUX */
1118
1119 # ifdef LINUX
1120 # ifndef __GNUC__
1121 /* The Intel compiler doesn't like inline assembly */
1122 # define USE_GENERIC_PUSH_REGS
1123 # endif
1124 # define OS_TYPE "LINUX"
1125 # define LINUX_STACKBOTTOM
1126 # if 0
1127 # define HEURISTIC1
1128 # undef STACK_GRAN
1129 # define STACK_GRAN 0x10000000
1130 /* STACKBOTTOM is usually 0xc0000000, but this changes with */
1131 /* different kernel configurations. In particular, systems */
1132 /* with 2GB physical memory will usually move the user */
1133 /* address space limit, and hence initial SP to 0x80000000. */
1134 # endif
1135 # if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
1136 # define MPROTECT_VDB
1137 # else
1138 /* We seem to get random errors in incremental mode, */
1139 /* possibly because Linux threads is itself a malloc client */
1140 /* and can't deal with the signals. */
1141 # endif
1142 # define HEAP_START (ptr_t)0x1000
1143 /* This encourages mmap to give us low addresses, */
1144 /* thus allowing the heap to grow to ~3GB */
1145 # ifdef __ELF__
1146 # define DYNAMIC_LOADING
1147 # ifdef UNDEFINED /* includes ro data */
1148 extern int _etext[];
1149 # define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
1150 # endif
1151 # include <features.h>
1152 # if defined(__GLIBC__) && __GLIBC__ >= 2
1153 # define SEARCH_FOR_DATA_START
1154 # else
1155 extern char **__environ;
1156 # define DATASTART ((ptr_t)(&__environ))
1157 /* hideous kludge: __environ is the first */
1158 /* word in crt0.o, and delimits the start */
1159 /* of the data segment, no matter which */
1160 /* ld options were passed through. */
1161 /* We could use _etext instead, but that */
1162 /* would include .rodata, which may */
1163 /* contain large read-only data tables */
1164 /* that we'd rather not scan. */
1165 # endif
1166 extern int _end[];
1167 # define DATAEND (_end)
1168 # else
1169 extern int etext[];
1170 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1171 # endif
1172 # ifdef USE_I686_PREFETCH
1173 /* FIXME: Thus should use __builtin_prefetch, but we'll leave that */
1174 /* for the next rtelease. */
1175 # define PREFETCH(x) \
1176 __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x)))
1177 /* Empirically prefetcht0 is much more effective at reducing */
1178 /* cache miss stalls for the targetted load instructions. But it */
1179 /* seems to interfere enough with other cache traffic that the net */
1180 /* result is worse than prefetchnta. */
1181 # if 0
1182 /* Using prefetches for write seems to have a slight negative */
1183 /* impact on performance, at least for a PIII/500. */
1184 # define PREFETCH_FOR_WRITE(x) \
1185 __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x)))
1186 # endif
1187 # endif
1188 # ifdef USE_3DNOW_PREFETCH
1189 # define PREFETCH(x) \
1190 __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x)))
1191 # define PREFETCH_FOR_WRITE(x) \
1192 __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x)))
1193 # endif
1194 # endif
1195 # ifdef CYGWIN32
1196 # define OS_TYPE "CYGWIN32"
1197 # define DATASTART ((ptr_t)GC_DATASTART) /* From gc.h */
1198 # define DATAEND ((ptr_t)GC_DATAEND)
1199 # undef STACK_GRAN
1200 # define STACK_GRAN 0x10000
1201 # define HEURISTIC1
1202 # endif
1203 # ifdef OS2
1204 # define OS_TYPE "OS2"
1205 /* STACKBOTTOM and DATASTART are handled specially in */
1206 /* os_dep.c. OS2 actually has the right */
1207 /* system call! */
1208 # define DATAEND /* not needed */
1209 # define USE_GENERIC_PUSH_REGS
1210 # endif
1211 # ifdef MSWIN32
1212 # define OS_TYPE "MSWIN32"
1213 /* STACKBOTTOM and DATASTART are handled specially in */
1214 /* os_dep.c. */
1215 # ifndef __WATCOMC__
1216 # define MPROTECT_VDB
1217 # endif
1218 # define DATAEND /* not needed */
1219 # endif
1220 # ifdef MSWINCE
1221 # define OS_TYPE "MSWINCE"
1222 # define DATAEND /* not needed */
1223 # endif
1224 # ifdef DJGPP
1225 # define OS_TYPE "DJGPP"
1226 # include "stubinfo.h"
1227 extern int etext[];
1228 extern int _stklen;
1229 extern int __djgpp_stack_limit;
1230 # define DATASTART ((ptr_t)((((word) (etext)) + 0x1ff) & ~0x1ff))
1231 /* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \
1232 + _stklen)) */
1233 # define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen))
1234 /* This may not be right. */
1235 # endif
1236 # ifdef OPENBSD
1237 # define OS_TYPE "OPENBSD"
1238 # endif
1239 # ifdef FREEBSD
1240 # define OS_TYPE "FREEBSD"
1241 # ifndef GC_FREEBSD_THREADS
1242 # define MPROTECT_VDB
1243 # endif
1244 # define SIG_SUSPEND SIGUSR1
1245 # define SIG_THR_RESTART SIGUSR2
1246 # define FREEBSD_STACKBOTTOM
1247 # ifdef __ELF__
1248 # define DYNAMIC_LOADING
1249 # endif
1250 extern char etext[];
1251 extern char * GC_FreeBSDGetDataStart();
1252 # define DATASTART GC_FreeBSDGetDataStart(0x1000, &etext)
1253 # endif
1254 # ifdef NETBSD
1255 # define OS_TYPE "NETBSD"
1256 # ifdef __ELF__
1257 # define DYNAMIC_LOADING
1258 # endif
1259 # endif
1260 # ifdef THREE86BSD
1261 # define OS_TYPE "THREE86BSD"
1262 # endif
1263 # ifdef BSDI
1264 # define OS_TYPE "BSDI"
1265 # endif
1266 # if defined(OPENBSD) || defined(NETBSD) \
1267 || defined(THREE86BSD) || defined(BSDI)
1268 # define HEURISTIC2
1269 extern char etext[];
1270 # define DATASTART ((ptr_t)(etext))
1271 # endif
1272 # ifdef NEXT
1273 # define OS_TYPE "NEXT"
1274 # define DATASTART ((ptr_t) get_etext())
1275 # define STACKBOTTOM ((ptr_t)0xc0000000)
1276 # define DATAEND /* not needed */
1277 # endif
1278 # ifdef DOS4GW
1279 # define OS_TYPE "DOS4GW"
1280 extern long __nullarea;
1281 extern char _end;
1282 extern char *_STACKTOP;
1283 /* Depending on calling conventions Watcom C either precedes
1284 or does not precedes with undescore names of C-variables.
1285 Make sure startup code variables always have the same names. */
1286 #pragma aux __nullarea "*";
1287 #pragma aux _end "*";
1288 # define STACKBOTTOM ((ptr_t) _STACKTOP)
1289 /* confused? me too. */
1290 # define DATASTART ((ptr_t) &__nullarea)
1291 # define DATAEND ((ptr_t) &_end)
1292 # endif
1293 # ifdef HURD
1294 # define OS_TYPE "HURD"
1295 # define STACK_GROWS_DOWN
1296 # define HEURISTIC2
1297 extern int __data_start[];
1298 # define DATASTART ( (ptr_t) (__data_start))
1299 extern int _end[];
1300 # define DATAEND ( (ptr_t) (_end))
1301 /* # define MPROTECT_VDB Not quite working yet? */
1302 # define DYNAMIC_LOADING
1303 # endif
1304 # endif
1305
1306 # ifdef NS32K
1307 # define MACH_TYPE "NS32K"
1308 # define ALIGNMENT 4
1309 extern char **environ;
1310 # define DATASTART ((ptr_t)(&environ))
1311 /* hideous kludge: environ is the first */
1312 /* word in crt0.o, and delimits the start */
1313 /* of the data segment, no matter which */
1314 /* ld options were passed through. */
1315 # define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */
1316 # endif
1317
1318 # ifdef MIPS
1319 # define MACH_TYPE "MIPS"
1320 # ifdef LINUX
1321 /* This was developed for a linuxce style platform. Probably */
1322 /* needs to be tweaked for workstation class machines. */
1323 # define OS_TYPE "LINUX"
1324 # define DYNAMIC_LOADING
1325 extern int _end[];
1326 # define DATAEND (_end)
1327 extern int __data_start[];
1328 # define DATASTART ((ptr_t)(__data_start))
1329 # define ALIGNMENT 4
1330 # define USE_GENERIC_PUSH_REGS
1331 # if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2 || __GLIBC__ > 2
1332 # define LINUX_STACKBOTTOM
1333 # else
1334 # define STACKBOTTOM 0x80000000
1335 # endif
1336 # endif /* Linux */
1337 # ifdef EWS4800
1338 # define HEURISTIC2
1339 # if defined(_MIPS_SZPTR) && (_MIPS_SZPTR == 64)
1340 extern int _fdata[], _end[];
1341 # define DATASTART ((ptr_t)_fdata)
1342 # define DATAEND ((ptr_t)_end)
1343 # define CPP_WORDSZ _MIPS_SZPTR
1344 # define ALIGNMENT (_MIPS_SZPTR/8)
1345 # else
1346 extern int etext[], edata[], end[];
1347 extern int _DYNAMIC_LINKING[], _gp[];
1348 # define DATASTART ((ptr_t)((((word)etext + 0x3ffff) & ~0x3ffff) \
1349 + ((word)etext & 0xffff)))
1350 # define DATAEND (edata)
1351 # define DATASTART2 (_DYNAMIC_LINKING \
1352 ? (ptr_t)(((word)_gp + 0x8000 + 0x3ffff) & ~0x3ffff) \
1353 : (ptr_t)edata)
1354 # define DATAEND2 (end)
1355 # define ALIGNMENT 4
1356 # endif
1357 # define OS_TYPE "EWS4800"
1358 # define USE_GENERIC_PUSH_REGS 1
1359 # endif
1360 # ifdef ULTRIX
1361 # define HEURISTIC2
1362 # define DATASTART (ptr_t)0x10000000
1363 /* Could probably be slightly higher since */
1364 /* startup code allocates lots of stuff. */
1365 # define OS_TYPE "ULTRIX"
1366 # define ALIGNMENT 4
1367 # endif
1368 # ifdef RISCOS
1369 # define HEURISTIC2
1370 # define DATASTART (ptr_t)0x10000000
1371 # define OS_TYPE "RISCOS"
1372 # define ALIGNMENT 4 /* Required by hardware */
1373 # endif
1374 # ifdef IRIX5
1375 # define HEURISTIC2
1376 extern int _fdata[];
1377 # define DATASTART ((ptr_t)(_fdata))
1378 # ifdef USE_MMAP
1379 # define HEAP_START (ptr_t)0x30000000
1380 # else
1381 # define HEAP_START DATASTART
1382 # endif
1383 /* Lowest plausible heap address. */
1384 /* In the MMAP case, we map there. */
1385 /* In either case it is used to identify */
1386 /* heap sections so they're not */
1387 /* considered as roots. */
1388 # define OS_TYPE "IRIX5"
1389 /*# define MPROTECT_VDB DOB: this should work, but there is evidence */
1390 /* of recent breakage. */
1391 # ifdef _MIPS_SZPTR
1392 # define CPP_WORDSZ _MIPS_SZPTR
1393 # define ALIGNMENT (_MIPS_SZPTR/8)
1394 # if CPP_WORDSZ != 64
1395 # define ALIGN_DOUBLE
1396 # endif
1397 # else
1398 # define ALIGNMENT 4
1399 # define ALIGN_DOUBLE
1400 # endif
1401 # define DYNAMIC_LOADING
1402 # endif
1403 # ifdef MSWINCE
1404 # define OS_TYPE "MSWINCE"
1405 # define ALIGNMENT 4
1406 # define DATAEND /* not needed */
1407 # endif
1408 # if defined(NETBSD)
1409 # define ALIGNMENT 4
1410 # define OS_TYPE "NETBSD"
1411 # define HEURISTIC2
1412 # define USE_GENERIC_PUSH_REGS
1413 # ifdef __ELF__
1414 extern int etext[];
1415 # define DATASTART GC_data_start
1416 # define NEED_FIND_LIMIT
1417 # define DYNAMIC_LOADING
1418 # else
1419 # define DATASTART ((ptr_t) 0x10000000)
1420 # define STACKBOTTOM ((ptr_t) 0x7ffff000)
1421 # endif /* _ELF_ */
1422 # endif
1423 # endif
1424
1425 # ifdef RS6000
1426 # define MACH_TYPE "RS6000"
1427 # ifdef ALIGNMENT
1428 # undef ALIGNMENT
1429 # endif
1430 # ifdef IA64
1431 # undef IA64 /* DOB: some AIX installs stupidly define IA64 in /usr/include/sys/systemcfg.h */
1432 # endif
1433 # ifdef __64BIT__
1434 # define ALIGNMENT 8
1435 # define CPP_WORDSZ 64
1436 # define STACKBOTTOM ((ptr_t)0x1000000000000000)
1437 # else
1438 # define ALIGNMENT 4
1439 # define CPP_WORDSZ 32
1440 # define STACKBOTTOM ((ptr_t)((ulong)&errno))
1441 # endif
1442 # define USE_MMAP
1443 # define USE_MMAP_ANON
1444 /* From AIX linker man page:
1445 _text Specifies the first location of the program.
1446 _etext Specifies the first location after the program.
1447 _data Specifies the first location of the data.
1448 _edata Specifies the first location after the initialized data
1449 _end or end Specifies the first location after all data.
1450 */
1451 extern int _data[], _end[];
1452 # define DATASTART ((ptr_t)((ulong)_data))
1453 # define DATAEND ((ptr_t)((ulong)_end))
1454 extern int errno;
1455 # define USE_GENERIC_PUSH_REGS
1456 # define DYNAMIC_LOADING
1457 /* For really old versions of AIX, this may have to be removed. */
1458 # endif
1459
1460 # ifdef HP_PA
1461 # define MACH_TYPE "HP_PA"
1462 # ifdef __LP64__
1463 # define CPP_WORDSZ 64
1464 # define ALIGNMENT 8
1465 # else
1466 # define CPP_WORDSZ 32
1467 # define ALIGNMENT 4
1468 # define ALIGN_DOUBLE
1469 # endif
1470 # if !defined(GC_HPUX_THREADS) && !defined(GC_LINUX_THREADS)
1471 # ifndef LINUX /* For now. */
1472 # define MPROTECT_VDB
1473 # endif
1474 # else
1475 # define GENERIC_COMPARE_AND_SWAP
1476 /* No compare-and-swap instruction. Use pthread mutexes */
1477 /* when we absolutely have to. */
1478 # ifdef PARALLEL_MARK
1479 # define USE_MARK_BYTES
1480 /* Minimize compare-and-swap usage. */
1481 # endif
1482 # endif
1483 # define STACK_GROWS_UP
1484 # ifdef HPUX
1485 # define OS_TYPE "HPUX"
1486 extern int __data_start[];
1487 # define DATASTART ((ptr_t)(__data_start))
1488 # if 0
1489 /* The following appears to work for 7xx systems running HP/UX */
1490 /* 9.xx Furthermore, it might result in much faster */
1491 /* collections than HEURISTIC2, which may involve scanning */
1492 /* segments that directly precede the stack. It is not the */
1493 /* default, since it may not work on older machine/OS */
1494 /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */
1495 /* this.) */
1496 # define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */
1497 # else
1498 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1499 /* to this. Note that the GC must be initialized before the */
1500 /* first putenv call. */
1501 extern char ** environ;
1502 # define STACKBOTTOM ((ptr_t)environ)
1503 # endif
1504 # define DYNAMIC_LOADING
1505 # include <unistd.h>
1506 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1507 # ifndef __GNUC__
1508 # define PREFETCH(x) { \
1509 register long addr = (long)(x); \
1510 (void) _asm ("LDW", 0, 0, addr, 0); \
1511 }
1512 # endif
1513 # endif /* HPUX */
1514 # ifdef LINUX
1515 # define OS_TYPE "LINUX"
1516 # define LINUX_STACKBOTTOM
1517 # define DYNAMIC_LOADING
1518 # define SEARCH_FOR_DATA_START
1519 extern int _end[];
1520 # define DATAEND (&_end)
1521 # endif /* LINUX */
1522 # endif /* HP_PA */
1523
1524 # ifdef ALPHA
1525 # define MACH_TYPE "ALPHA"
1526 # define ALIGNMENT 8
1527 # define CPP_WORDSZ 64
1528 # ifndef LINUX
1529 # define USE_GENERIC_PUSH_REGS
1530 /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */
1531 /* fp registers in some cases when the target is a 21264. The assembly */
1532 /* code doesn't handle that yet, and version dependencies make that a */
1533 /* bit tricky. Do the easy thing for now. */
1534 # endif
1535 # ifdef NETBSD
1536 # define OS_TYPE "NETBSD"
1537 # define HEURISTIC2
1538 # define DATASTART GC_data_start
1539 # define ELFCLASS32 32
1540 # define ELFCLASS64 64
1541 # define ELF_CLASS ELFCLASS64
1542 # define DYNAMIC_LOADING
1543 # endif
1544 # ifdef OPENBSD
1545 # define OS_TYPE "OPENBSD"
1546 # define HEURISTIC2
1547 # ifdef __ELF__ /* since OpenBSD/Alpha 2.9 */
1548 # define DATASTART GC_data_start
1549 # define ELFCLASS32 32
1550 # define ELFCLASS64 64
1551 # define ELF_CLASS ELFCLASS64
1552 # else /* ECOFF, until OpenBSD/Alpha 2.7 */
1553 # define DATASTART ((ptr_t) 0x140000000)
1554 # endif
1555 # endif
1556 # ifdef FREEBSD
1557 # define OS_TYPE "FREEBSD"
1558 /* MPROTECT_VDB is not yet supported at all on FreeBSD/alpha. */
1559 # define SIG_SUSPEND SIGUSR1
1560 # define SIG_THR_RESTART SIGUSR2
1561 # define FREEBSD_STACKBOTTOM
1562 # ifdef __ELF__
1563 # define DYNAMIC_LOADING
1564 # endif
1565 /* Handle unmapped hole alpha*-*-freebsd[45]* puts between etext and edata. */
1566 extern char etext[];
1567 extern char edata[];
1568 extern char end[];
1569 # define NEED_FIND_LIMIT
1570 # define DATASTART ((ptr_t)(&etext))
1571 # define DATAEND (GC_find_limit (DATASTART, TRUE))
1572 # define DATASTART2 ((ptr_t)(&edata))
1573 # define DATAEND2 ((ptr_t)(&end))
1574 # endif
1575 # ifdef OSF1
1576 # define OS_TYPE "OSF1"
1577 # define DATASTART ((ptr_t) 0x140000000)
1578 extern int _end[];
1579 # define DATAEND ((ptr_t) &_end)
1580 extern char ** environ;
1581 /* round up from the value of environ to the nearest page boundary */
1582 /* Probably breaks if putenv is called before collector */
1583 /* initialization. */
1584 # define STACKBOTTOM ((ptr_t)(((word)(environ) | (getpagesize()-1))+1))
1585 /* # define HEURISTIC2 */
1586 /* Normally HEURISTIC2 is too conervative, since */
1587 /* the text segment immediately follows the stack. */
1588 /* Hence we give an upper pound. */
1589 /* This is currently unused, since we disabled HEURISTIC2 */
1590 extern int __start[];
1591 # define HEURISTIC2_LIMIT ((ptr_t)((word)(__start) & ~(getpagesize()-1)))
1592 # ifndef GC_OSF1_THREADS
1593 /* Unresolved signal issues with threads. */
1594 # define MPROTECT_VDB
1595 # endif
1596 # define DYNAMIC_LOADING
1597 # endif
1598 # ifdef LINUX
1599 # define OS_TYPE "LINUX"
1600 # define LINUX_STACKBOTTOM
1601 # ifdef __ELF__
1602 # define SEARCH_FOR_DATA_START
1603 # define DYNAMIC_LOADING
1604 # else
1605 # define DATASTART ((ptr_t) 0x140000000)
1606 # endif
1607 extern int _end[];
1608 # define DATAEND (_end)
1609 # define MPROTECT_VDB
1610 /* Has only been superficially tested. May not */
1611 /* work on all versions. */
1612 # endif
1613 # endif
1614
1615 # ifdef IA64
1616 # define MACH_TYPE "IA64"
1617 # define USE_GENERIC_PUSH_REGS
1618 /* We need to get preserved registers in addition to register */
1619 /* windows. That's easiest to do with setjmp. */
1620 # ifdef PARALLEL_MARK
1621 # define USE_MARK_BYTES
1622 /* Compare-and-exchange is too expensive to use for */
1623 /* setting mark bits. */
1624 # endif
1625 # ifdef HPUX
1626 # ifdef _ILP32
1627 # define CPP_WORDSZ 32
1628 # define ALIGN_DOUBLE
1629 /* Requires 8 byte alignment for malloc */
1630 # define ALIGNMENT 4
1631 # else
1632 # ifndef _LP64
1633 ---> unknown ABI
1634 # endif
1635 # define CPP_WORDSZ 64
1636 # define ALIGN_DOUBLE
1637 /* Requires 16 byte alignment for malloc */
1638 # define ALIGNMENT 8
1639 # endif
1640 # define OS_TYPE "HPUX"
1641 extern int __data_start[];
1642 # define DATASTART ((ptr_t)(__data_start))
1643 /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2 */
1644 /* to this. Note that the GC must be initialized before the */
1645 /* first putenv call. */
1646 extern char ** environ;
1647 # define STACKBOTTOM ((ptr_t)environ)
1648 # define HPUX_STACKBOTTOM
1649 # define DYNAMIC_LOADING
1650 # include <unistd.h>
1651 # define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
1652 /* The following was empirically determined, and is probably */
1653 /* not very robust. */
1654 /* Note that the backing store base seems to be at a nice */
1655 /* address minus one page. */
1656 # define BACKING_STORE_DISPLACEMENT 0x1000000
1657 # define BACKING_STORE_ALIGNMENT 0x1000
1658 extern ptr_t GC_register_stackbottom;
1659 # define BACKING_STORE_BASE GC_register_stackbottom
1660 /* Known to be wrong for recent HP/UX versions!!! */
1661 # endif
1662 # ifdef LINUX
1663 # define CPP_WORDSZ 64
1664 # define ALIGN_DOUBLE
1665 /* Requires 16 byte alignment for malloc */
1666 # define ALIGNMENT 8
1667 # define OS_TYPE "LINUX"
1668 /* The following works on NUE and older kernels: */
1669 /* # define STACKBOTTOM ((ptr_t) 0xa000000000000000l) */
1670 /* This does not work on NUE: */
1671 # define LINUX_STACKBOTTOM
1672 /* We also need the base address of the register stack */
1673 /* backing store. This is computed in */
1674 /* GC_linux_register_stack_base based on the following */
1675 /* constants: */
1676 # define BACKING_STORE_ALIGNMENT 0x100000
1677 # define BACKING_STORE_DISPLACEMENT 0x80000000
1678 extern ptr_t GC_register_stackbottom;
1679 # define BACKING_STORE_BASE GC_register_stackbottom
1680 # define SEARCH_FOR_DATA_START
1681 # ifdef __GNUC__
1682 # define DYNAMIC_LOADING
1683 # else
1684 /* In the Intel compiler environment, we seem to end up with */
1685 /* statically linked executables and an undefined reference */
1686 /* to _DYNAMIC */
1687 # endif
1688 # define MPROTECT_VDB
1689 /* Requires Linux 2.3.47 or later. */
1690 extern int _end[];
1691 # define DATAEND (_end)
1692 # ifdef __GNUC__
1693 # ifndef __INTEL_COMPILER
1694 # define PREFETCH(x) \
1695 __asm__ (" lfetch [%0]": : "r"(x))
1696 # define PREFETCH_FOR_WRITE(x) \
1697 __asm__ (" lfetch.excl [%0]": : "r"(x))
1698 # define CLEAR_DOUBLE(x) \
1699 __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x)))
1700 # else
1701 # include <ia64intrin.h>
1702 # define PREFETCH(x) \
1703 __lfetch(__lfhint_none, (x))
1704 # define PREFETCH_FOR_WRITE(x) \
1705 __lfetch(__lfhint_nta, (x))
1706 # define CLEAR_DOUBLE(x) \
1707 __stf_spill((void *)(x), 0)
1708 # endif // __INTEL_COMPILER
1709 # endif
1710 # endif
1711 # ifdef MSWIN32
1712 /* FIXME: This is a very partial guess. There is no port, yet. */
1713 # define OS_TYPE "MSWIN32"
1714 /* STACKBOTTOM and DATASTART are handled specially in */
1715 /* os_dep.c. */
1716 # define DATAEND /* not needed */
1717 # if defined(_WIN64)
1718 # define CPP_WORDSZ 64
1719 # else
1720 # define CPP_WORDSZ 32 /* Is this possible? */
1721 # endif
1722 # define ALIGNMENT 8
1723 # endif
1724 # endif
1725
1726 # ifdef M88K
1727 # define MACH_TYPE "M88K"
1728 # define ALIGNMENT 4
1729 # define ALIGN_DOUBLE
1730 extern int etext[];
1731 # ifdef CX_UX
1732 # define OS_TYPE "CX_UX"
1733 # define DATASTART ((((word)etext + 0x3fffff) & ~0x3fffff) + 0x10000)
1734 # endif
1735 # ifdef DGUX
1736 # define OS_TYPE "DGUX"
1737 extern ptr_t GC_SysVGetDataStart();
1738 # define DATASTART GC_SysVGetDataStart(0x10000, etext)
1739 # endif
1740 # define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
1741 # endif
1742
1743 # ifdef S370
1744 /* If this still works, and if anyone cares, this should probably */
1745 /* be moved to the S390 category. */
1746 # define MACH_TYPE "S370"
1747 # define ALIGNMENT 4 /* Required by hardware */
1748 # define USE_GENERIC_PUSH_REGS
1749 # ifdef UTS4
1750 # define OS_TYPE "UTS4"
1751 extern int etext[];
1752 extern int _etext[];
1753 extern int _end[];
1754 extern ptr_t GC_SysVGetDataStart();
1755 # define DATASTART GC_SysVGetDataStart(0x10000, _etext)
1756 # define DATAEND (_end)
1757 # define HEURISTIC2
1758 # endif
1759 # endif
1760
1761 # ifdef S390
1762 # define MACH_TYPE "S390"
1763 # define USE_GENERIC_PUSH_REGS
1764 # ifndef __s390x__
1765 # define ALIGNMENT 4
1766 # define CPP_WORDSZ 32
1767 # else
1768 # define ALIGNMENT 8
1769 # define CPP_WORDSZ 64
1770 # endif
1771 # ifndef HBLKSIZE
1772 # define HBLKSIZE 4096
1773 # endif
1774 # ifdef LINUX
1775 # define OS_TYPE "LINUX"
1776 # define LINUX_STACKBOTTOM
1777 # define DYNAMIC_LOADING
1778 extern int __data_start[];
1779 # define DATASTART ((ptr_t)(__data_start))
1780 extern int _end[];
1781 # define DATAEND (_end)
1782 # define CACHE_LINE_SIZE 256
1783 # define GETPAGESIZE() 4096
1784 # endif
1785 # endif
1786
1787 # if defined(PJ)
1788 # define ALIGNMENT 4
1789 extern int _etext[];
1790 # define DATASTART ((ptr_t)(_etext))
1791 # define HEURISTIC1
1792 # endif
1793
1794 # ifdef ARM32
1795 # define CPP_WORDSZ 32
1796 # define MACH_TYPE "ARM32"
1797 # define ALIGNMENT 4
1798 # ifdef NETBSD
1799 # define OS_TYPE "NETBSD"
1800 # define HEURISTIC2
1801 # ifdef __ELF__
1802 # define DATASTART GC_data_start
1803 # define DYNAMIC_LOADING
1804 # else
1805 extern char etext[];
1806 # define DATASTART ((ptr_t)(etext))
1807 # endif
1808 # define USE_GENERIC_PUSH_REGS
1809 # endif
1810 # ifdef LINUX
1811 # define OS_TYPE "LINUX"
1812 # define LINUX_STACKBOTTOM
1813 # undef STACK_GRAN
1814 # define STACK_GRAN 0x10000000
1815 # define USE_GENERIC_PUSH_REGS
1816 # ifdef __ELF__
1817 # define DYNAMIC_LOADING
1818 # include <features.h>
1819 # if defined(__GLIBC__) && __GLIBC__ >= 2
1820 # define SEARCH_FOR_DATA_START
1821 # else
1822 extern char **__environ;
1823 # define DATASTART ((ptr_t)(&__environ))
1824 /* hideous kludge: __environ is the first */
1825 /* word in crt0.o, and delimits the start */
1826 /* of the data segment, no matter which */
1827 /* ld options were passed through. */
1828 /* We could use _etext instead, but that */
1829 /* would include .rodata, which may */
1830 /* contain large read-only data tables */
1831 /* that we'd rather not scan. */
1832 # endif
1833 extern int _end[];
1834 # define DATAEND (_end)
1835 # else
1836 extern int etext[];
1837 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1838 # endif
1839 # endif
1840 # ifdef MSWINCE
1841 # define OS_TYPE "MSWINCE"
1842 # define DATAEND /* not needed */
1843 # endif
1844 # ifdef NOSYS
1845 /* __data_start is usually defined in the target linker script. */
1846 extern int __data_start[];
1847 # define DATASTART (ptr_t)(__data_start)
1848 # define USE_GENERIC_PUSH_REGS
1849 /* __stack_base__ is set in newlib/libc/sys/arm/crt0.S */
1850 extern void *__stack_base__;
1851 # define STACKBOTTOM ((ptr_t) (__stack_base__))
1852 # endif
1853 #endif
1854
1855 # ifdef CRIS
1856 # define MACH_TYPE "CRIS"
1857 # define CPP_WORDSZ 32
1858 # define ALIGNMENT 1
1859 # define OS_TYPE "LINUX"
1860 # define DYNAMIC_LOADING
1861 # define LINUX_STACKBOTTOM
1862 # define USE_GENERIC_PUSH_REGS
1863 # define SEARCH_FOR_DATA_START
1864 extern int _end[];
1865 # define DATAEND (_end)
1866 # endif
1867
1868 # ifdef SH
1869 # define MACH_TYPE "SH"
1870 # define ALIGNMENT 4
1871 # ifdef MSWINCE
1872 # define OS_TYPE "MSWINCE"
1873 # define DATAEND /* not needed */
1874 # endif
1875 # ifdef LINUX
1876 # define OS_TYPE "LINUX"
1877 # define LINUX_STACKBOTTOM
1878 # define USE_GENERIC_PUSH_REGS
1879 # define DYNAMIC_LOADING
1880 # define SEARCH_FOR_DATA_START
1881 extern int _end[];
1882 # define DATAEND (_end)
1883 # endif
1884 # ifdef NETBSD
1885 # define OS_TYPE "NETBSD"
1886 # define HEURISTIC2
1887 # define DATASTART GC_data_start
1888 # define USE_GENERIC_PUSH_REGS
1889 # define DYNAMIC_LOADING
1890 # endif
1891 # endif
1892
1893 # ifdef SH4
1894 # define MACH_TYPE "SH4"
1895 # define OS_TYPE "MSWINCE"
1896 # define ALIGNMENT 4
1897 # define DATAEND /* not needed */
1898 # endif
1899
1900 # ifdef M32R
1901 # define CPP_WORDSZ 32
1902 # define MACH_TYPE "M32R"
1903 # define ALIGNMENT 4
1904 # ifdef LINUX
1905 # define OS_TYPE "LINUX"
1906 # define LINUX_STACKBOTTOM
1907 # undef STACK_GRAN
1908 # define STACK_GRAN 0x10000000
1909 # define USE_GENERIC_PUSH_REGS
1910 # define DYNAMIC_LOADING
1911 # define SEARCH_FOR_DATA_START
1912 extern int _end[];
1913 # define DATAEND (_end)
1914 # endif
1915 # endif
1916
1917 # ifdef X86_64
1918 # define MACH_TYPE "X86_64"
1919 # define ALIGNMENT 8
1920 # define CPP_WORDSZ 64
1921 # ifndef HBLKSIZE
1922 # define HBLKSIZE 4096
1923 # endif
1924 # define CACHE_LINE_SIZE 64
1925 # define USE_GENERIC_PUSH_REGS
1926 # ifdef LINUX
1927 # define OS_TYPE "LINUX"
1928 # define LINUX_STACKBOTTOM
1929 # if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
1930 # define MPROTECT_VDB
1931 # else
1932 /* We seem to get random errors in incremental mode, */
1933 /* possibly because Linux threads is itself a malloc client */
1934 /* and can't deal with the signals. */
1935 # endif
1936 # ifdef __ELF__
1937 # define DYNAMIC_LOADING
1938 # ifdef UNDEFINED /* includes ro data */
1939 extern int _etext[];
1940 # define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
1941 # endif
1942 # include <features.h>
1943 # define SEARCH_FOR_DATA_START
1944 extern int _end[];
1945 # define DATAEND (_end)
1946 # else
1947 extern int etext[];
1948 # define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
1949 # endif
1950 # if defined(__GNUC__) && __GNUC >= 3
1951 # define PREFETCH(x) __builtin_prefetch((x), 0, 0)
1952 # define PREFETCH_FOR_WRITE(x) __builtin_prefetch((x), 1)
1953 # endif
1954 # endif
1955 # ifdef NETBSD
1956 # define OS_TYPE "NETBSD"
1957 # ifdef __ELF__
1958 # define DYNAMIC_LOADING
1959 # endif
1960 # define HEURISTIC2
1961 extern char etext[];
1962 # define SEARCH_FOR_DATA_START
1963 # endif
1964 # endif
1965
1966 #if defined(LINUX) && defined(USE_MMAP)
1967 /* The kernel may do a somewhat better job merging mappings etc. */
1968 /* with anonymous mappings. */
1969 # define USE_MMAP_ANON
1970 #endif
1971
1972 #if defined(LINUX) && defined(REDIRECT_MALLOC)
1973 /* Rld appears to allocate some memory with its own allocator, and */
1974 /* some through malloc, which might be redirected. To make this */
1975 /* work with collectable memory, we have to scan memory allocated */
1976 /* by rld's internal malloc. */
1977 # define USE_PROC_FOR_LIBRARIES
1978 #endif
1979
1980 # ifndef STACK_GROWS_UP
1981 # define STACK_GROWS_DOWN
1982 # endif
1983
1984 # ifndef CPP_WORDSZ
1985 # define CPP_WORDSZ 32
1986 # endif
1987
1988 # ifndef OS_TYPE
1989 # define OS_TYPE ""
1990 # endif
1991
1992 # ifndef DATAEND
1993 extern int end[];
1994 # define DATAEND (end)
1995 # endif
1996
1997 # if defined(SVR4) && !defined(GETPAGESIZE)
1998 # include <unistd.h>
1999 # define GETPAGESIZE() sysconf(_SC_PAGESIZE)
2000 # endif
2001
2002 # ifndef GETPAGESIZE
2003 # if defined(SUNOS5) || defined(IRIX5)
2004 # include <unistd.h>
2005 # endif
2006 # define GETPAGESIZE() getpagesize()
2007 # endif
2008
2009 # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
2010 /* OS has SVR4 generic features. Probably others also qualify. */
2011 # define SVR4
2012 # endif
2013
2014 # if defined(SUNOS5) || defined(DRSNX)
2015 /* OS has SUNOS5 style semi-undocumented interface to dynamic */
2016 /* loader. */
2017 # define SUNOS5DL
2018 /* OS has SUNOS5 style signal handlers. */
2019 # define SUNOS5SIGS
2020 # endif
2021
2022 # if defined(HPUX)
2023 # define SUNOS5SIGS
2024 # endif
2025
2026 # if defined(FREEBSD) && (__FreeBSD__ >= 4)
2027 # define SUNOS5SIGS
2028 # endif
2029
2030 # if defined(SVR4) || defined(LINUX) || defined(IRIX5) || defined(HPUX) \
2031 || defined(OPENBSD) || defined(NETBSD) || defined(FREEBSD) \
2032 || defined(DGUX) || defined(BSD) || defined(SUNOS4) \
2033 || defined(_AIX) || defined(DARWIN) || defined(OSF1)
2034 # define UNIX_LIKE /* Basic Unix-like system calls work. */
2035 # endif
2036
2037 # if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
2038 -> bad word size
2039 # endif
2040
2041 # ifdef PCR
2042 # undef DYNAMIC_LOADING
2043 # undef STACKBOTTOM
2044 # undef HEURISTIC1
2045 # undef HEURISTIC2
2046 # undef PROC_VDB
2047 # undef MPROTECT_VDB
2048 # define PCR_VDB
2049 # endif
2050
2051 # ifdef SRC_M3
2052 /* Postponed for now. */
2053 # undef PROC_VDB
2054 # undef MPROTECT_VDB
2055 # endif
2056
2057 # ifdef SMALL_CONFIG
2058 /* Presumably not worth the space it takes. */
2059 # undef PROC_VDB
2060 # undef MPROTECT_VDB
2061 # endif
2062
2063 # ifdef USE_MUNMAP
2064 # undef MPROTECT_VDB /* Can't deal with address space holes. */
2065 # endif
2066
2067 # ifdef PARALLEL_MARK
2068 # undef MPROTECT_VDB /* For now. */
2069 # endif
2070
2071 # if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
2072 # define DEFAULT_VDB
2073 # endif
2074
2075 # ifndef PREFETCH
2076 # define PREFETCH(x)
2077 # define NO_PREFETCH
2078 # endif
2079
2080 # ifndef PREFETCH_FOR_WRITE
2081 # define PREFETCH_FOR_WRITE(x)
2082 # define NO_PREFETCH_FOR_WRITE
2083 # endif
2084
2085 # ifndef CACHE_LINE_SIZE
2086 # define CACHE_LINE_SIZE 32 /* Wild guess */
2087 # endif
2088
2089 # ifdef LINUX
2090 # define REGISTER_LIBRARIES_EARLY
2091 /* We sometimes use dl_iterate_phdr, which may acquire an internal */
2092 /* lock. This isn't safe after the world has stopped. So we must */
2093 /* call GC_register_dynamic_libraries before stopping the world. */
2094 /* For performance reasons, this may be beneficial on other */
2095 /* platforms as well, though it should be avoided in win32. */
2096 # endif /* LINUX */
2097
2098 # if defined(SEARCH_FOR_DATA_START)
2099 extern ptr_t GC_data_start;
2100 # define DATASTART GC_data_start
2101 # endif
2102
2103 # ifndef CLEAR_DOUBLE
2104 # define CLEAR_DOUBLE(x) \
2105 ((word*)x)[0] = 0; \
2106 ((word*)x)[1] = 0;
2107 # endif /* CLEAR_DOUBLE */
2108
2109 /* Internally we use GC_SOLARIS_THREADS to test for either old or pthreads. */
2110 # if defined(GC_SOLARIS_PTHREADS) && !defined(GC_SOLARIS_THREADS)
2111 # define GC_SOLARIS_THREADS
2112 # endif
2113
2114 # if defined(GC_IRIX_THREADS) && !defined(IRIX5)
2115 --> inconsistent configuration
2116 # endif
2117 # if defined(GC_LINUX_THREADS) && !defined(LINUX)
2118 --> inconsistent configuration
2119 # endif
2120 # if defined(GC_SOLARIS_THREADS) && !defined(SUNOS5)
2121 --> inconsistent configuration
2122 # endif
2123 # if defined(GC_HPUX_THREADS) && !defined(HPUX)
2124 --> inconsistent configuration
2125 # endif
2126 # if defined(GC_AIX_THREADS) && !defined(_AIX)
2127 --> inconsistent configuration
2128 # endif
2129 # if defined(GC_WIN32_THREADS) && !defined(MSWIN32) && !defined(CYGWIN32)
2130 --> inconsistent configuration
2131 # endif
2132
2133 # if defined(PCR) || defined(SRC_M3) || \
2134 defined(GC_SOLARIS_THREADS) || defined(GC_WIN32_THREADS) || \
2135 defined(GC_PTHREADS)
2136 # define THREADS
2137 # endif
2138
2139 # if defined(HP_PA) || defined(M88K) \
2140 || defined(POWERPC) && !defined(DARWIN) \
2141 || defined(LINT) || defined(MSWINCE) || defined(ARM32) || defined(CRIS) \
2142 || (defined(I386) && defined(__LCC__))
2143 /* Use setjmp based hack to mark from callee-save registers. */
2144 /* The define should move to the individual platform */
2145 /* descriptions. */
2146 # define USE_GENERIC_PUSH_REGS
2147 # endif
2148
2149 # if defined(MSWINCE)
2150 # define NO_GETENV
2151 # endif
2152
2153 # if defined(SPARC)
2154 # define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */
2155 /* include assembly code to do it well. */
2156 # endif
2157
2158 /* Can we save call chain in objects for debugging? */
2159 /* SET NFRAMES (# of saved frames) and NARGS (#of args for each */
2160 /* frame) to reasonable values for the platform. */
2161 /* Set SAVE_CALL_CHAIN if we can. SAVE_CALL_COUNT can be specified */
2162 /* at build time, though we feel free to adjust it slightly. */
2163 /* Define NEED_CALLINFO if we either save the call stack or */
2164 /* GC_ADD_CALLER is defined. */
2165 /* GC_CAN_SAVE_CALL_STACKS is set in gc.h. */
2166
2167 #if defined(SPARC)
2168 # define CAN_SAVE_CALL_ARGS
2169 #endif
2170 #if (defined(I386) || defined(X86_64)) && defined(LINUX)
2171 /* SAVE_CALL_CHAIN is supported if the code is compiled to save */
2172 /* frame pointers by default, i.e. no -fomit-frame-pointer flag. */
2173 # define CAN_SAVE_CALL_ARGS
2174 #endif
2175
2176 # if defined(SAVE_CALL_COUNT) && !defined(GC_ADD_CALLER) \
2177 && defined(GC_CAN_SAVE_CALL_STACKS)
2178 # define SAVE_CALL_CHAIN
2179 # endif
2180 # ifdef SAVE_CALL_CHAIN
2181 # if defined(SAVE_CALL_NARGS) && defined(CAN_SAVE_CALL_ARGS)
2182 # define NARGS SAVE_CALL_NARGS
2183 # else
2184 # define NARGS 0 /* Number of arguments to save for each call. */
2185 # endif
2186 # endif
2187 # ifdef SAVE_CALL_CHAIN
2188 # ifndef SAVE_CALL_COUNT
2189 # define NFRAMES 6 /* Number of frames to save. Even for */
2190 /* alignment reasons. */
2191 # else
2192 # define NFRAMES ((SAVE_CALL_COUNT + 1) & ~1)
2193 # endif
2194 # define NEED_CALLINFO
2195 # endif /* SAVE_CALL_CHAIN */
2196 # ifdef GC_ADD_CALLER
2197 # define NFRAMES 1
2198 # define NARGS 0
2199 # define NEED_CALLINFO
2200 # endif
2201
2202 # if defined(MAKE_BACK_GRAPH) && !defined(DBG_HDRS_ALL)
2203 # define DBG_HDRS_ALL
2204 # endif
2205
2206 # if defined(POINTER_MASK) && !defined(POINTER_SHIFT)
2207 # define POINTER_SHIFT 0
2208 # endif
2209
2210 # if defined(POINTER_SHIFT) && !defined(POINTER_MASK)
2211 # define POINTER_MASK ((GC_word)(-1))
2212 # endif
2213
2214 # if !defined(FIXUP_POINTER) && defined(POINTER_MASK)
2215 # define FIXUP_POINTER(p) (p) = ((p) & (POINTER_MASK) << POINTER_SHIFT)
2216 # endif
2217
2218 # if defined(FIXUP_POINTER)
2219 # define NEED_FIXUP_POINTER 1
2220 # else
2221 # define NEED_FIXUP_POINTER 0
2222 # define FIXUP_POINTER(p)
2223 # endif
2224
2225 #ifdef GC_PRIVATE_H
2226 /* This relies on some type definitions from gc_priv.h, from */
2227 /* where it's normally included. */
2228 /* */
2229 /* How to get heap memory from the OS: */
2230 /* Note that sbrk()-like allocation is preferred, since it */
2231 /* usually makes it possible to merge consecutively allocated */
2232 /* chunks. It also avoids unintented recursion with */
2233 /* -DREDIRECT_MALLOC. */
2234 /* GET_MEM() returns a HLKSIZE aligned chunk. */
2235 /* 0 is taken to mean failure. */
2236 /* In the case os USE_MMAP, the argument must also be a */
2237 /* physical page size. */
2238 /* GET_MEM is currently not assumed to retrieve 0 filled space, */
2239 /* though we should perhaps take advantage of the case in which */
2240 /* does. */
2241 struct hblk; /* See gc_priv.h. */
2242 # ifdef PCR
2243 char * real_malloc();
2244 # define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \
2245 + GC_page_size-1)
2246 # else
2247 # ifdef OS2
2248 void * os2_alloc(size_t bytes);
2249 # define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \
2250 + GC_page_size) \
2251 + GC_page_size-1)
2252 # else
2253 # if defined(NEXT) || defined(DOS4GW) || \
2254 (defined(AMIGA) && !defined(GC_AMIGA_FASTALLOC)) || \
2255 (defined(SUNOS5) && !defined(USE_MMAP))
2256 # define GET_MEM(bytes) HBLKPTR((size_t) \
2257 calloc(1, (size_t)bytes + GC_page_size) \
2258 + GC_page_size-1)
2259 # else
2260 # ifdef MSWIN32
2261 extern ptr_t GC_win32_get_mem();
2262 # define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes)
2263 # else
2264 # ifdef MACOS
2265 # if defined(USE_TEMPORARY_MEMORY)
2266 extern Ptr GC_MacTemporaryNewPtr(size_t size,
2267 Boolean clearMemory);
2268 # define GET_MEM(bytes) HBLKPTR( \
2269 GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \
2270 + GC_page_size-1)
2271 # else
2272 # define GET_MEM(bytes) HBLKPTR( \
2273 NewPtrClear(bytes + GC_page_size) + GC_page_size-1)
2274 # endif
2275 # else
2276 # ifdef MSWINCE
2277 extern ptr_t GC_wince_get_mem();
2278 # define GET_MEM(bytes) (struct hblk *)GC_wince_get_mem(bytes)
2279 # else
2280 # if defined(AMIGA) && defined(GC_AMIGA_FASTALLOC)
2281 extern void *GC_amiga_get_mem(size_t size);
2282 # define GET_MEM(bytes) HBLKPTR((size_t) \
2283 GC_amiga_get_mem((size_t)bytes + GC_page_size) \
2284 + GC_page_size-1)
2285 # else
2286 extern ptr_t GC_unix_get_mem();
2287 # define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes)
2288 # endif
2289 # endif
2290 # endif
2291 # endif
2292 # endif
2293 # endif
2294 # endif
2295
2296 #endif /* GC_PRIVATE_H */
2297
2298 #if defined(_AIX) && !defined(__GNUC__) && !defined(__STDC__)
2299 /* IBMs xlc compiler doesn't appear to follow the convention of */
2300 /* defining __STDC__ to be zero in extended mode. */
2301 # define __STDC__ 0
2302 #endif
2303
2304 # endif /* GCCONFIG_H */
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