2 * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
3 * Copyright (c) 1996-1997 by Silicon Graphics. All rights reserved.
5 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
6 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
8 * Permission is hereby granted to use or copy this program
9 * for any purpose, provided the above notices are retained on all copies.
10 * Permission to modify the code and to distribute modified code is granted,
11 * provided the above notices are retained, and a notice that the code was
12 * modified is included with the above copyright notice.
17 # if defined(LINUX) && !defined(POWERPC)
18 # include <linux/version.h>
19 # if (LINUX_VERSION_CODE <= 0x10400)
20 /* Ugly hack to get struct sigcontext_struct definition. Required */
21 /* for some early 1.3.X releases. Will hopefully go away soon. */
22 /* in some later Linux releases, asm/sigcontext.h may have to */
23 /* be included instead. */
25 # include <asm/signal.h>
28 /* Kernels prior to 2.1.1 defined struct sigcontext_struct instead of */
29 /* struct sigcontext. libc6 (glibc2) uses "struct sigcontext" in */
30 /* prototypes, so we have to include the top-level sigcontext.h to */
31 /* make sure the former gets defined to be the latter if appropriate. */
32 # include <features.h>
33 # if 2 <= __GLIBC__ && 0 == __GLIBC_MINOR__
34 # include <sigcontext.h>
35 # else /* not 2 <= __GLIBC__ */
36 /* libc5 doesn't have <sigcontext.h>: go directly with the kernel */
37 /* one. Check LINUX_VERSION_CODE to see which we should reference. */
38 # include <asm/sigcontext.h>
39 # endif /* 2 <= __GLIBC__ */
42 # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) && !defined(MACOS)
43 # include <sys/types.h>
44 # if !defined(MSWIN32) && !defined(SUNOS4)
52 /* Blatantly OS dependent routines, except for those that are related */
53 /* dynamic loading. */
55 # if !defined(THREADS) && !defined(STACKBOTTOM) && defined(HEURISTIC2)
56 # define NEED_FIND_LIMIT
59 # if defined(IRIX_THREADS)
60 # define NEED_FIND_LIMIT
63 # if (defined(SUNOS4) & defined(DYNAMIC_LOADING)) && !defined(PCR)
64 # define NEED_FIND_LIMIT
67 # if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
68 # define NEED_FIND_LIMIT
71 # if defined(LINUX) && (defined(POWERPC) || defined(ALPHA))
72 # define NEED_FIND_LIMIT
75 #ifdef NEED_FIND_LIMIT
80 # include <machine/trap.h>
84 # include <proto/exec.h>
85 # include <proto/dos.h>
86 # include <dos/dosextens.h>
87 # include <workbench/startup.h>
91 # define WIN32_LEAN_AND_MEAN
97 # include <Processes.h>
101 # include <sys/uio.h>
102 # include <malloc.h> /* for locking */
105 # include <sys/types.h>
106 # include <sys/mman.h>
107 # include <sys/stat.h>
112 # include <sys/siginfo.h>
115 # define setjmp(env) sigsetjmp(env, 1)
116 # define longjmp(env, val) siglongjmp(env, val)
117 # define jmp_buf sigjmp_buf
121 /* Apparently necessary for djgpp 2.01. May casuse problems with */
122 /* other versions. */
123 typedef long unsigned int caddr_t;
127 # include "il/PCR_IL.h"
128 # include "th/PCR_ThCtl.h"
129 # include "mm/PCR_MM.h"
132 #if !defined(NO_EXECUTE_PERMISSION)
133 # define OPT_PROT_EXEC PROT_EXEC
135 # define OPT_PROT_EXEC 0
138 #if defined(LINUX) && defined(POWERPC)
141 void GC_init_linuxppc()
143 extern ptr_t GC_find_limit();
144 extern char **_environ;
145 /* This may need to be environ, without the underscore, for */
147 GC_data_start = GC_find_limit((ptr_t)&_environ, FALSE);
151 #if defined(LINUX) && defined(ALPHA)
154 void GC_init_linuxalpha()
157 FILE *fp = fopen("/proc/self/maps", "r");
161 ptr_t stacktop = 0, stackbottom = 0;
162 ptr_t textstart = 0, textend = 0;
163 ptr_t datastart = 0, dataend = 0;
164 ptr_t bssstart = 0, bssend = 0;
167 ptr_t start, end, offset;
168 unsigned short major, minor;
172 int n = fscanf(fp, "%lx-%lx %c%c%c%c %lx %hx:%hx %d",
173 &start, &end, &r, &w, &x, &p, &offset, &major, &minor, &inode);
177 * If local variable lies within segment, it is stack.
178 * Else if segment lies below _end and is executable,
179 * it is text. Otherwise, if segment start lies between
180 * _etext and _end and segment is writable and is mapped
181 * to the executable image it is data, otherwise bss.
183 if (start < (ptr_t)&fp && end > (ptr_t)&fp && w == 'w') {
186 } else if (start < (ptr_t)&_end && w == '-' && x == 'x') {
189 } else if (start >= (ptr_t)&_etext &&
190 start < (ptr_t)&_end && w == 'w') {
200 //printf("%016lx-%016lx %c%c%c%c %016lx %02hx:%02hx %d\n",
201 // start, end, r, w, x, p, offset, major, minor, inode);
203 while (fgetc(fp) != '\n') ;
207 //fprintf(stderr, "text: %lx-%lx\n", textstart, textend);
208 //fprintf(stderr, "data: %lx-%lx\n", datastart, dataend);
209 //fprintf(stderr, "bss: %lx-%lx\n", bssstart, bssend);
210 //fprintf(stderr, "stack: %lx-%lx\n", stacktop, stackbottom);
212 GC_data_start = datastart;
215 extern ptr_t GC_find_limit();
217 /* This may need to be environ, without the underscore, for */
219 GC_data_start = GC_find_limit((ptr_t)&_edata, FALSE);
223 //fprintf(stderr, "GC_data_start = %p\n", GC_data_start);
229 # ifndef ECOS_GC_MEMORY_SIZE
230 # define ECOS_GC_MEMORY_SIZE (448 * 1024)
231 # endif /* ECOS_GC_MEMORY_SIZE */
233 // setjmp() function, as described in ANSI para 7.6.1.1
234 #define setjmp( __env__ ) hal_setjmp( __env__ )
236 // FIXME: This is a simple way of allocating memory which is
237 // compatible with ECOS early releases. Later releases use a more
238 // sophisticated means of allocating memory than this simple static
239 // allocator, but this method is at least bound to work.
240 static char memory[ECOS_GC_MEMORY_SIZE];
241 static char *brk = memory;
243 static void *tiny_sbrk(ptrdiff_t increment)
249 if (brk > memory + sizeof memory)
257 #define sbrk tiny_sbrk
264 # if !defined(__IBMC__) && !defined(__WATCOMC__) /* e.g. EMX */
267 unsigned short magic_number;
268 unsigned short padding[29];
272 #define E_MAGIC(x) (x).magic_number
273 #define EMAGIC 0x5A4D
274 #define E_LFANEW(x) (x).new_exe_offset
277 unsigned char magic_number[2];
278 unsigned char byte_order;
279 unsigned char word_order;
280 unsigned long exe_format_level;
283 unsigned long padding1[13];
284 unsigned long object_table_offset;
285 unsigned long object_count;
286 unsigned long padding2[31];
289 #define E32_MAGIC1(x) (x).magic_number[0]
290 #define E32MAGIC1 'L'
291 #define E32_MAGIC2(x) (x).magic_number[1]
292 #define E32MAGIC2 'X'
293 #define E32_BORDER(x) (x).byte_order
295 #define E32_WORDER(x) (x).word_order
297 #define E32_CPU(x) (x).cpu
299 #define E32_OBJTAB(x) (x).object_table_offset
300 #define E32_OBJCNT(x) (x).object_count
306 unsigned long pagemap;
307 unsigned long mapsize;
308 unsigned long reserved;
311 #define O32_FLAGS(x) (x).flags
312 #define OBJREAD 0x0001L
313 #define OBJWRITE 0x0002L
314 #define OBJINVALID 0x0080L
315 #define O32_SIZE(x) (x).size
316 #define O32_BASE(x) (x).base
318 # else /* IBM's compiler */
320 /* A kludge to get around what appears to be a header file bug */
322 # define WORD unsigned short
325 # define DWORD unsigned long
332 # endif /* __IBMC__ */
334 # define INCL_DOSEXCEPTIONS
335 # define INCL_DOSPROCESS
336 # define INCL_DOSERRORS
337 # define INCL_DOSMODULEMGR
338 # define INCL_DOSMEMMGR
342 /* Disable and enable signals during nontrivial allocations */
344 void GC_disable_signals(void)
348 DosEnterMustComplete(&nest);
349 if (nest != 1) ABORT("nested GC_disable_signals");
352 void GC_enable_signals(void)
356 DosExitMustComplete(&nest);
357 if (nest != 0) ABORT("GC_enable_signals");
363 # if !defined(PCR) && !defined(AMIGA) && !defined(MSWIN32) \
364 && !defined(MACOS) && !defined(DJGPP) && !defined(DOS4GW) \
365 && !defined(NO_SIGSET)
367 # if defined(sigmask) && !defined(UTS4)
368 /* Use the traditional BSD interface */
369 # define SIGSET_T int
370 # define SIG_DEL(set, signal) (set) &= ~(sigmask(signal))
371 # define SIG_FILL(set) (set) = 0x7fffffff
372 /* Setting the leading bit appears to provoke a bug in some */
373 /* longjmp implementations. Most systems appear not to have */
375 # define SIGSETMASK(old, new) (old) = sigsetmask(new)
377 /* Use POSIX/SYSV interface */
378 # define SIGSET_T sigset_t
379 # define SIG_DEL(set, signal) sigdelset(&(set), (signal))
380 # define SIG_FILL(set) sigfillset(&set)
381 # define SIGSETMASK(old, new) sigprocmask(SIG_SETMASK, &(new), &(old))
384 static GC_bool mask_initialized = FALSE;
386 static SIGSET_T new_mask;
388 static SIGSET_T old_mask;
390 static SIGSET_T dummy;
392 #if defined(PRINTSTATS) && !defined(THREADS)
393 # define CHECK_SIGNALS
394 int GC_sig_disabled = 0;
397 void GC_disable_signals()
399 if (!mask_initialized) {
402 SIG_DEL(new_mask, SIGSEGV);
403 SIG_DEL(new_mask, SIGILL);
404 SIG_DEL(new_mask, SIGQUIT);
406 SIG_DEL(new_mask, SIGBUS);
409 SIG_DEL(new_mask, SIGIOT);
412 SIG_DEL(new_mask, SIGEMT);
415 SIG_DEL(new_mask, SIGTRAP);
417 mask_initialized = TRUE;
419 # ifdef CHECK_SIGNALS
420 if (GC_sig_disabled != 0) ABORT("Nested disables");
423 SIGSETMASK(old_mask,new_mask);
426 void GC_enable_signals()
428 # ifdef CHECK_SIGNALS
429 if (GC_sig_disabled != 1) ABORT("Unmatched enable");
432 SIGSETMASK(dummy,old_mask);
439 /* Ivan Demakov: simplest way (to me) */
440 #if defined (DOS4GW) || defined (NO_SIGSET)
441 void GC_disable_signals() { }
442 void GC_enable_signals() { }
445 /* Find the page size */
449 void GC_setpagesize()
453 GetSystemInfo(&sysinfo);
454 GC_page_size = sysinfo.dwPageSize;
458 # if defined(MPROTECT_VDB) || defined(PROC_VDB) || defined(USE_MMAP)
459 void GC_setpagesize()
461 GC_page_size = GETPAGESIZE();
464 /* It's acceptable to fake it. */
465 void GC_setpagesize()
467 GC_page_size = HBLKSIZE;
473 * Find the base of the stack.
474 * Used only in single-threaded environment.
475 * With threads, GC_mark_roots needs to know how to do this.
476 * Called with allocator lock held.
479 # define is_writable(prot) ((prot) == PAGE_READWRITE \
480 || (prot) == PAGE_WRITECOPY \
481 || (prot) == PAGE_EXECUTE_READWRITE \
482 || (prot) == PAGE_EXECUTE_WRITECOPY)
483 /* Return the number of bytes that are writable starting at p. */
484 /* The pointer p is assumed to be page aligned. */
485 /* If base is not 0, *base becomes the beginning of the */
486 /* allocation region containing p. */
487 word GC_get_writable_length(ptr_t p, ptr_t *base)
489 MEMORY_BASIC_INFORMATION buf;
493 result = VirtualQuery(p, &buf, sizeof(buf));
494 if (result != sizeof(buf)) ABORT("Weird VirtualQuery result");
495 if (base != 0) *base = (ptr_t)(buf.AllocationBase);
496 protect = (buf.Protect & ~(PAGE_GUARD | PAGE_NOCACHE));
497 if (!is_writable(protect)) {
500 if (buf.State != MEM_COMMIT) return(0);
501 return(buf.RegionSize);
504 ptr_t GC_get_stack_base()
507 ptr_t sp = (ptr_t)(&dummy);
508 ptr_t trunc_sp = (ptr_t)((word)sp & ~(GC_page_size - 1));
509 word size = GC_get_writable_length(trunc_sp, 0);
511 return(trunc_sp + size);
519 ptr_t GC_get_stack_base()
524 if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
525 GC_err_printf0("DosGetInfoBlocks failed\n");
526 ABORT("DosGetInfoBlocks failed\n");
528 return((ptr_t)(ptib -> tib_pstacklimit));
535 ptr_t GC_get_stack_base()
537 extern struct WBStartup *_WBenchMsg;
541 struct Process *proc;
542 struct CommandLineInterface *cli;
545 if ((task = FindTask(0)) == 0) {
546 GC_err_puts("Cannot find own task structure\n");
547 ABORT("task missing");
549 proc = (struct Process *)task;
550 cli = BADDR(proc->pr_CLI);
552 if (_WBenchMsg != 0 || cli == 0) {
553 size = (char *)task->tc_SPUpper - (char *)task->tc_SPLower;
555 size = cli->cli_DefaultStack * 4;
557 return (ptr_t)(__base + GC_max(size, __stack));
564 # ifdef NEED_FIND_LIMIT
565 /* Some tools to implement HEURISTIC2 */
566 # define MIN_PAGE_SIZE 256 /* Smallest conceivable page size, bytes */
567 /* static */ jmp_buf GC_jmp_buf;
570 void GC_fault_handler(sig)
573 longjmp(GC_jmp_buf, 1);
577 typedef void (*handler)(int);
579 typedef void (*handler)();
582 # if defined(SUNOS5SIGS) || defined(IRIX5)
583 static struct sigaction old_segv_act;
584 static struct sigaction old_bus_act;
586 static handler old_segv_handler, old_bus_handler;
589 void GC_setup_temporary_fault_handler()
592 # if defined(SUNOS5SIGS) || defined(IRIX5)
593 struct sigaction act;
595 act.sa_handler = GC_fault_handler;
596 act.sa_flags = SA_RESTART | SA_NODEFER;
597 /* The presence of SA_NODEFER represents yet another gross */
598 /* hack. Under Solaris 2.3, siglongjmp doesn't appear to */
599 /* interact correctly with -lthread. We hide the confusion */
600 /* by making sure that signal handling doesn't affect the */
603 (void) sigemptyset(&act.sa_mask);
605 /* Older versions have a bug related to retrieving and */
606 /* and setting a handler at the same time. */
607 (void) sigaction(SIGSEGV, 0, &old_segv_act);
608 (void) sigaction(SIGSEGV, &act, 0);
610 (void) sigaction(SIGSEGV, &act, &old_segv_act);
611 # ifdef _sigargs /* Irix 5.x, not 6.x */
612 /* Under 5.x, we may get SIGBUS. */
613 /* Pthreads doesn't exist under 5.x, so we don't */
614 /* have to worry in the threads case. */
615 (void) sigaction(SIGBUS, &act, &old_bus_act);
617 # endif /* IRIX_THREADS */
619 old_segv_handler = signal(SIGSEGV, GC_fault_handler);
621 old_bus_handler = signal(SIGBUS, GC_fault_handler);
627 void GC_reset_fault_handler()
630 # if defined(SUNOS5SIGS) || defined(IRIX5)
631 (void) sigaction(SIGSEGV, &old_segv_act, 0);
632 # ifdef _sigargs /* Irix 5.x, not 6.x */
633 (void) sigaction(SIGBUS, &old_bus_act, 0);
636 (void) signal(SIGSEGV, old_segv_handler);
638 (void) signal(SIGBUS, old_bus_handler);
644 /* Return the first nonaddressible location > p (up) or */
645 /* the smallest location q s.t. [q,p] is addressible (!up). */
646 ptr_t GC_find_limit(p, up)
651 static VOLATILE ptr_t result;
652 /* Needs to be static, since otherwise it may not be */
653 /* preserved across the longjmp. Can safely be */
654 /* static since it's only called once, with the */
655 /* allocation lock held. */
658 GC_setup_temporary_fault_handler();
659 if (setjmp(GC_jmp_buf) == 0) {
660 result = (ptr_t)(((word)(p))
661 & ~(MIN_PAGE_SIZE-1));
664 result += MIN_PAGE_SIZE;
666 result -= MIN_PAGE_SIZE;
668 GC_noop1((word)(*result));
671 GC_reset_fault_handler();
673 result += MIN_PAGE_SIZE;
684 ptr_t GC_get_stack_base()
689 # define STACKBOTTOM_ALIGNMENT_M1 ((word)STACK_GRAN - 1)
691 # if defined(STACKBASE)
692 extern ptr_t STACKBASE;
699 # ifdef STACK_GROWS_DOWN
700 result = (ptr_t)((((word)(&dummy))
701 + STACKBOTTOM_ALIGNMENT_M1)
702 & ~STACKBOTTOM_ALIGNMENT_M1);
704 result = (ptr_t)(((word)(&dummy))
705 & ~STACKBOTTOM_ALIGNMENT_M1);
707 # endif /* HEURISTIC1 */
709 # ifdef STACK_GROWS_DOWN
710 result = GC_find_limit((ptr_t)(&dummy), TRUE);
711 # ifdef HEURISTIC2_LIMIT
712 if (result > HEURISTIC2_LIMIT
713 && (ptr_t)(&dummy) < HEURISTIC2_LIMIT) {
714 result = HEURISTIC2_LIMIT;
718 result = GC_find_limit((ptr_t)(&dummy), FALSE);
719 # ifdef HEURISTIC2_LIMIT
720 if (result < HEURISTIC2_LIMIT
721 && (ptr_t)(&dummy) > HEURISTIC2_LIMIT) {
722 result = HEURISTIC2_LIMIT;
727 # endif /* HEURISTIC2 */
729 # endif /* STACKBOTTOM */
730 # endif /* STACKBASE */
734 # endif /* ! AMIGA */
736 # endif /* ! MSWIN32 */
739 * Register static data segment(s) as roots.
740 * If more data segments are added later then they need to be registered
741 * add that point (as we do with SunOS dynamic loading),
742 * or GC_mark_roots needs to check for them (as we do with PCR).
743 * Called with allocator lock held.
748 void GC_register_data_segments()
752 HMODULE module_handle;
756 struct exe_hdr hdrdos; /* MSDOS header. */
757 struct e32_exe hdr386; /* Real header for my executable */
758 struct o32_obj seg; /* Currrent segment */
762 if (DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR) {
763 GC_err_printf0("DosGetInfoBlocks failed\n");
764 ABORT("DosGetInfoBlocks failed\n");
766 module_handle = ppib -> pib_hmte;
767 if (DosQueryModuleName(module_handle, PBUFSIZ, path) != NO_ERROR) {
768 GC_err_printf0("DosQueryModuleName failed\n");
769 ABORT("DosGetInfoBlocks failed\n");
771 myexefile = fopen(path, "rb");
772 if (myexefile == 0) {
773 GC_err_puts("Couldn't open executable ");
774 GC_err_puts(path); GC_err_puts("\n");
775 ABORT("Failed to open executable\n");
777 if (fread((char *)(&hdrdos), 1, sizeof hdrdos, myexefile) < sizeof hdrdos) {
778 GC_err_puts("Couldn't read MSDOS header from ");
779 GC_err_puts(path); GC_err_puts("\n");
780 ABORT("Couldn't read MSDOS header");
782 if (E_MAGIC(hdrdos) != EMAGIC) {
783 GC_err_puts("Executable has wrong DOS magic number: ");
784 GC_err_puts(path); GC_err_puts("\n");
785 ABORT("Bad DOS magic number");
787 if (fseek(myexefile, E_LFANEW(hdrdos), SEEK_SET) != 0) {
788 GC_err_puts("Seek to new header failed in ");
789 GC_err_puts(path); GC_err_puts("\n");
790 ABORT("Bad DOS magic number");
792 if (fread((char *)(&hdr386), 1, sizeof hdr386, myexefile) < sizeof hdr386) {
793 GC_err_puts("Couldn't read MSDOS header from ");
794 GC_err_puts(path); GC_err_puts("\n");
795 ABORT("Couldn't read OS/2 header");
797 if (E32_MAGIC1(hdr386) != E32MAGIC1 || E32_MAGIC2(hdr386) != E32MAGIC2) {
798 GC_err_puts("Executable has wrong OS/2 magic number:");
799 GC_err_puts(path); GC_err_puts("\n");
800 ABORT("Bad OS/2 magic number");
802 if ( E32_BORDER(hdr386) != E32LEBO || E32_WORDER(hdr386) != E32LEWO) {
803 GC_err_puts("Executable %s has wrong byte order: ");
804 GC_err_puts(path); GC_err_puts("\n");
805 ABORT("Bad byte order");
807 if ( E32_CPU(hdr386) == E32CPU286) {
808 GC_err_puts("GC can't handle 80286 executables: ");
809 GC_err_puts(path); GC_err_puts("\n");
812 if (fseek(myexefile, E_LFANEW(hdrdos) + E32_OBJTAB(hdr386),
814 GC_err_puts("Seek to object table failed: ");
815 GC_err_puts(path); GC_err_puts("\n");
816 ABORT("Seek to object table failed");
818 for (nsegs = E32_OBJCNT(hdr386); nsegs > 0; nsegs--) {
820 if (fread((char *)(&seg), 1, sizeof seg, myexefile) < sizeof seg) {
821 GC_err_puts("Couldn't read obj table entry from ");
822 GC_err_puts(path); GC_err_puts("\n");
823 ABORT("Couldn't read obj table entry");
825 flags = O32_FLAGS(seg);
826 if (!(flags & OBJWRITE)) continue;
827 if (!(flags & OBJREAD)) continue;
828 if (flags & OBJINVALID) {
829 GC_err_printf0("Object with invalid pages?\n");
832 GC_add_roots_inner(O32_BASE(seg), O32_BASE(seg)+O32_SIZE(seg), FALSE);
839 /* Unfortunately, we have to handle win32s very differently from NT, */
840 /* Since VirtualQuery has very different semantics. In particular, */
841 /* under win32s a VirtualQuery call on an unmapped page returns an */
842 /* invalid result. Under GC_register_data_segments is a noop and */
843 /* all real work is done by GC_register_dynamic_libraries. Under */
844 /* win32s, we cannot find the data segments associated with dll's. */
845 /* We rgister the main data segment here. */
846 GC_bool GC_win32s = FALSE; /* We're running under win32s. */
848 GC_bool GC_is_win32s()
850 DWORD v = GetVersion();
852 /* Check that this is not NT, and Windows major version <= 3 */
853 return ((v & 0x80000000) && (v & 0xff) <= 3);
858 GC_win32s = GC_is_win32s();
861 /* Return the smallest address a such that VirtualQuery */
862 /* returns correct results for all addresses between a and start. */
863 /* Assumes VirtualQuery returns correct information for start. */
864 ptr_t GC_least_described_address(ptr_t start)
866 MEMORY_BASIC_INFORMATION buf;
873 GetSystemInfo(&sysinfo);
874 limit = sysinfo.lpMinimumApplicationAddress;
875 p = (ptr_t)((word)start & ~(GC_page_size - 1));
877 q = (LPVOID)(p - GC_page_size);
878 if ((ptr_t)q > (ptr_t)p /* underflow */ || q < limit) break;
879 result = VirtualQuery(q, &buf, sizeof(buf));
880 if (result != sizeof(buf) || buf.AllocationBase == 0) break;
881 p = (ptr_t)(buf.AllocationBase);
886 /* Is p the start of either the malloc heap, or of one of our */
888 GC_bool GC_is_heap_base (ptr_t p)
893 # ifndef REDIRECT_MALLOC
894 static ptr_t malloc_heap_pointer = 0;
896 if (0 == malloc_heap_pointer) {
897 MEMORY_BASIC_INFORMATION buf;
898 register DWORD result = VirtualQuery(malloc(1), &buf, sizeof(buf));
900 if (result != sizeof(buf)) {
901 ABORT("Weird VirtualQuery result");
903 malloc_heap_pointer = (ptr_t)(buf.AllocationBase);
905 if (p == malloc_heap_pointer) return(TRUE);
907 for (i = 0; i < GC_n_heap_bases; i++) {
908 if (GC_heap_bases[i] == p) return(TRUE);
913 void GC_register_root_section(ptr_t static_root)
915 MEMORY_BASIC_INFORMATION buf;
921 char * limit, * new_limit;
923 if (!GC_win32s) return;
924 p = base = limit = GC_least_described_address(static_root);
925 GetSystemInfo(&sysinfo);
926 while (p < sysinfo.lpMaximumApplicationAddress) {
927 result = VirtualQuery(p, &buf, sizeof(buf));
928 if (result != sizeof(buf) || buf.AllocationBase == 0
929 || GC_is_heap_base(buf.AllocationBase)) break;
930 new_limit = (char *)p + buf.RegionSize;
931 protect = buf.Protect;
932 if (buf.State == MEM_COMMIT
933 && is_writable(protect)) {
934 if ((char *)p == limit) {
937 if (base != limit) GC_add_roots_inner(base, limit, FALSE);
942 if (p > (LPVOID)new_limit /* overflow */) break;
943 p = (LPVOID)new_limit;
945 if (base != limit) GC_add_roots_inner(base, limit, FALSE);
948 void GC_register_data_segments()
952 GC_register_root_section((ptr_t)(&dummy));
957 void GC_register_data_segments()
959 extern struct WBStartup *_WBenchMsg;
960 struct Process *proc;
961 struct CommandLineInterface *cli;
965 if ( _WBenchMsg != 0 ) {
966 if ((myseglist = _WBenchMsg->sm_Segment) == 0) {
967 GC_err_puts("No seglist from workbench\n");
971 if ((proc = (struct Process *)FindTask(0)) == 0) {
972 GC_err_puts("Cannot find process structure\n");
975 if ((cli = BADDR(proc->pr_CLI)) == 0) {
976 GC_err_puts("No CLI\n");
979 if ((myseglist = cli->cli_Module) == 0) {
980 GC_err_puts("No seglist from CLI\n");
985 for (data = (ULONG *)BADDR(myseglist); data != 0;
986 data = (ULONG *)BADDR(data[0])) {
987 # ifdef AMIGA_SKIP_SEG
988 if (((ULONG) GC_register_data_segments < (ULONG) &data[1]) ||
989 ((ULONG) GC_register_data_segments > (ULONG) &data[1] + data[-1])) {
992 # endif /* AMIGA_SKIP_SEG */
993 GC_add_roots_inner((char *)&data[1],
994 ((char *)&data[1]) + data[-1], FALSE);
1002 # if (defined(SVR4) || defined(AUX) || defined(DGUX)) && !defined(PCR)
1003 char * GC_SysVGetDataStart(max_page_size, etext_addr)
1007 word text_end = ((word)(etext_addr) + sizeof(word) - 1)
1008 & ~(sizeof(word) - 1);
1009 /* etext rounded to word boundary */
1010 word next_page = ((text_end + (word)max_page_size - 1)
1011 & ~((word)max_page_size - 1));
1012 word page_offset = (text_end & ((word)max_page_size - 1));
1013 VOLATILE char * result = (char *)(next_page + page_offset);
1014 /* Note that this isnt equivalent to just adding */
1015 /* max_page_size to &etext if &etext is at a page boundary */
1017 GC_setup_temporary_fault_handler();
1018 if (setjmp(GC_jmp_buf) == 0) {
1019 /* Try writing to the address. */
1021 GC_reset_fault_handler();
1023 GC_reset_fault_handler();
1024 /* We got here via a longjmp. The address is not readable. */
1025 /* This is known to happen under Solaris 2.4 + gcc, which place */
1026 /* string constants in the text segment, but after etext. */
1027 /* Use plan B. Note that we now know there is a gap between */
1028 /* text and data segments, so plan A bought us something. */
1029 result = (char *)GC_find_limit((ptr_t)(DATAEND) - MIN_PAGE_SIZE, FALSE);
1031 return((char *)result);
1036 void GC_register_data_segments()
1038 # if !defined(PCR) && !defined(SRC_M3) && !defined(NEXT) && !defined(MACOS)
1039 # if defined(REDIRECT_MALLOC) && defined(SOLARIS_THREADS)
1040 /* As of Solaris 2.3, the Solaris threads implementation */
1041 /* allocates the data structure for the initial thread with */
1042 /* sbrk at process startup. It needs to be scanned, so that */
1043 /* we don't lose some malloc allocated data structures */
1044 /* hanging from it. We're on thin ice here ... */
1045 extern caddr_t sbrk();
1047 GC_add_roots_inner(DATASTART, (char *)sbrk(0), FALSE);
1049 GC_add_roots_inner(DATASTART, (char *)(DATAEND), FALSE);
1052 # if !defined(PCR) && defined(NEXT)
1053 GC_add_roots_inner(DATASTART, (char *) get_end(), FALSE);
1057 # if defined(THINK_C)
1058 extern void* GC_MacGetDataStart(void);
1059 /* globals begin above stack and end at a5. */
1060 GC_add_roots_inner((ptr_t)GC_MacGetDataStart(),
1061 (ptr_t)LMGetCurrentA5(), FALSE);
1063 # if defined(__MWERKS__)
1065 extern void* GC_MacGetDataStart(void);
1066 /* globals begin above stack and end at a5. */
1067 GC_add_roots_inner((ptr_t)GC_MacGetDataStart(),
1068 (ptr_t)LMGetCurrentA5(), FALSE);
1070 extern char __data_start__[], __data_end__[];
1071 GC_add_roots_inner((ptr_t)&__data_start__,
1072 (ptr_t)&__data_end__, FALSE);
1073 # endif /* __POWERPC__ */
1074 # endif /* __MWERKS__ */
1075 # endif /* !THINK_C */
1079 /* Dynamic libraries are added at every collection, since they may */
1083 # endif /* ! AMIGA */
1084 # endif /* ! MSWIN32 */
1088 * Auxiliary routines for obtaining memory from OS.
1091 # if !defined(OS2) && !defined(PCR) && !defined(AMIGA) \
1092 && !defined(MSWIN32) && !defined(MACOS) && !defined(DOS4GW)
1095 extern caddr_t sbrk();
1098 # define SBRK_ARG_T ptrdiff_t
1100 # define SBRK_ARG_T int
1104 /* The compiler seems to generate speculative reads one past the end of */
1105 /* an allocated object. Hence we need to make sure that the page */
1106 /* following the last heap page is also mapped. */
1107 ptr_t GC_unix_get_mem(bytes)
1110 caddr_t cur_brk = (caddr_t)sbrk(0);
1112 SBRK_ARG_T lsbs = (word)cur_brk & (GC_page_size-1);
1113 static caddr_t my_brk_val = 0;
1115 if ((SBRK_ARG_T)bytes < 0) return(0); /* too big */
1117 if((caddr_t)(sbrk(GC_page_size - lsbs)) == (caddr_t)(-1)) return(0);
1119 if (cur_brk == my_brk_val) {
1120 /* Use the extra block we allocated last time. */
1121 result = (ptr_t)sbrk((SBRK_ARG_T)bytes);
1122 if (result == (caddr_t)(-1)) return(0);
1123 result -= GC_page_size;
1125 result = (ptr_t)sbrk(GC_page_size + (SBRK_ARG_T)bytes);
1126 if (result == (caddr_t)(-1)) return(0);
1128 my_brk_val = result + bytes + GC_page_size; /* Always page aligned */
1129 return((ptr_t)result);
1132 #else /* Not RS6000 */
1134 #if defined(USE_MMAP)
1135 /* Tested only under IRIX5 */
1137 ptr_t GC_unix_get_mem(bytes)
1140 static GC_bool initialized = FALSE;
1143 static ptr_t last_addr = HEAP_START;
1146 fd = open("/dev/zero", O_RDONLY);
1149 if (bytes & (GC_page_size -1)) ABORT("Bad GET_MEM arg");
1150 result = mmap(last_addr, bytes, PROT_READ | PROT_WRITE | OPT_PROT_EXEC,
1151 MAP_PRIVATE | MAP_FIXED, fd, 0/* offset */);
1152 if (result == MAP_FAILED) return(0);
1153 last_addr = (ptr_t)result + bytes + GC_page_size - 1;
1154 last_addr = (ptr_t)((word)last_addr & ~(GC_page_size - 1));
1155 return((ptr_t)result);
1158 #else /* Not RS6000, not USE_MMAP */
1159 ptr_t GC_unix_get_mem(bytes)
1164 /* Bare sbrk isn't thread safe. Play by malloc rules. */
1165 /* The equivalent may be needed on other systems as well. */
1169 ptr_t cur_brk = (ptr_t)sbrk(0);
1170 SBRK_ARG_T lsbs = (word)cur_brk & (GC_page_size-1);
1172 if ((SBRK_ARG_T)bytes < 0) return(0); /* too big */
1174 if((ptr_t)sbrk(GC_page_size - lsbs) == (ptr_t)(-1)) return(0);
1176 result = (ptr_t)sbrk((SBRK_ARG_T)bytes);
1177 if (result == (ptr_t)(-1)) result = 0;
1185 #endif /* Not USE_MMAP */
1186 #endif /* Not RS6000 */
1192 void * os2_alloc(size_t bytes)
1196 if (DosAllocMem(&result, bytes, PAG_EXECUTE | PAG_READ |
1197 PAG_WRITE | PAG_COMMIT)
1201 if (result == 0) return(os2_alloc(bytes));
1209 word GC_n_heap_bases = 0;
1211 ptr_t GC_win32_get_mem(bytes)
1217 /* VirtualAlloc doesn't like PAGE_EXECUTE_READWRITE. */
1218 /* There are also unconfirmed rumors of other */
1219 /* problems, so we dodge the issue. */
1220 result = (ptr_t) GlobalAlloc(0, bytes + HBLKSIZE);
1221 result = (ptr_t)(((word)result + HBLKSIZE) & ~(HBLKSIZE-1));
1223 result = (ptr_t) VirtualAlloc(NULL, bytes,
1224 MEM_COMMIT | MEM_RESERVE,
1225 PAGE_EXECUTE_READWRITE);
1227 if (HBLKDISPL(result) != 0) ABORT("Bad VirtualAlloc result");
1228 /* If I read the documentation correctly, this can */
1229 /* only happen if HBLKSIZE > 64k or not a power of 2. */
1230 if (GC_n_heap_bases >= MAX_HEAP_SECTS) ABORT("Too many heap sections");
1231 GC_heap_bases[GC_n_heap_bases++] = result;
1237 /* Routine for pushing any additional roots. In THREADS */
1238 /* environment, this is also responsible for marking from */
1239 /* thread stacks. In the SRC_M3 case, it also handles */
1240 /* global variables. */
1242 void (*GC_push_other_roots)() = 0;
1246 PCR_ERes GC_push_thread_stack(PCR_Th_T *t, PCR_Any dummy)
1248 struct PCR_ThCtl_TInfoRep info;
1251 info.ti_stkLow = info.ti_stkHi = 0;
1252 result = PCR_ThCtl_GetInfo(t, &info);
1253 GC_push_all_stack((ptr_t)(info.ti_stkLow), (ptr_t)(info.ti_stkHi));
1257 /* Push the contents of an old object. We treat this as stack */
1258 /* data only becasue that makes it robust against mark stack */
1260 PCR_ERes GC_push_old_obj(void *p, size_t size, PCR_Any data)
1262 GC_push_all_stack((ptr_t)p, (ptr_t)p + size);
1263 return(PCR_ERes_okay);
1267 void GC_default_push_other_roots()
1269 /* Traverse data allocated by previous memory managers. */
1271 extern struct PCR_MM_ProcsRep * GC_old_allocator;
1273 if ((*(GC_old_allocator->mmp_enumerate))(PCR_Bool_false,
1276 ABORT("Old object enumeration failed");
1279 /* Traverse all thread stacks. */
1281 PCR_ThCtl_ApplyToAllOtherThreads(GC_push_thread_stack,0))
1282 || PCR_ERes_IsErr(GC_push_thread_stack(PCR_Th_CurrThread(), 0))) {
1283 ABORT("Thread stack marking failed\n");
1291 # ifdef ALL_INTERIOR_POINTERS
1296 extern void ThreadF__ProcessStacks();
1298 void GC_push_thread_stack(start, stop)
1301 GC_push_all_stack((ptr_t)start, (ptr_t)stop + sizeof(word));
1304 /* Push routine with M3 specific calling convention. */
1305 GC_m3_push_root(dummy1, p, dummy2, dummy3)
1307 ptr_t dummy1, dummy2;
1312 if ((ptr_t)(q) >= GC_least_plausible_heap_addr
1313 && (ptr_t)(q) < GC_greatest_plausible_heap_addr) {
1314 GC_push_one_checked(q,FALSE);
1318 /* M3 set equivalent to RTHeap.TracedRefTypes */
1319 typedef struct { int elts[1]; } RefTypeSet;
1320 RefTypeSet GC_TracedRefTypes = {{0x1}};
1322 /* From finalize.c */
1323 extern void GC_push_finalizer_structures();
1325 /* From stubborn.c: */
1326 # ifdef STUBBORN_ALLOC
1327 extern GC_PTR * GC_changing_list_start;
1331 void GC_default_push_other_roots()
1333 /* Use the M3 provided routine for finding static roots. */
1334 /* This is a bit dubious, since it presumes no C roots. */
1335 /* We handle the collector roots explicitly. */
1337 # ifdef STUBBORN_ALLOC
1338 GC_push_one(GC_changing_list_start);
1340 GC_push_finalizer_structures();
1341 RTMain__GlobalMapProc(GC_m3_push_root, 0, GC_TracedRefTypes);
1343 if (GC_words_allocd > 0) {
1344 ThreadF__ProcessStacks(GC_push_thread_stack);
1346 /* Otherwise this isn't absolutely necessary, and we have */
1347 /* startup ordering problems. */
1350 # endif /* SRC_M3 */
1352 # if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
1353 || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
1354 || defined(QUICK_THREADS)
1356 extern void GC_push_all_stacks();
1358 void GC_default_push_other_roots()
1360 GC_push_all_stacks();
1363 # endif /* SOLARIS_THREADS || ... */
1365 void (*GC_push_other_roots)() = GC_default_push_other_roots;
1370 * Routines for accessing dirty bits on virtual pages.
1371 * We plan to eventaually implement four strategies for doing so:
1372 * DEFAULT_VDB: A simple dummy implementation that treats every page
1373 * as possibly dirty. This makes incremental collection
1374 * useless, but the implementation is still correct.
1375 * PCR_VDB: Use PPCRs virtual dirty bit facility.
1376 * PROC_VDB: Use the /proc facility for reading dirty bits. Only
1377 * works under some SVR4 variants. Even then, it may be
1378 * too slow to be entirely satisfactory. Requires reading
1379 * dirty bits for entire address space. Implementations tend
1380 * to assume that the client is a (slow) debugger.
1381 * MPROTECT_VDB:Protect pages and then catch the faults to keep track of
1382 * dirtied pages. The implementation (and implementability)
1383 * is highly system dependent. This usually fails when system
1384 * calls write to a protected page. We prevent the read system
1385 * call from doing so. It is the clients responsibility to
1386 * make sure that other system calls are similarly protected
1387 * or write only to the stack.
1390 GC_bool GC_dirty_maintained = FALSE;
1394 /* All of the following assume the allocation lock is held, and */
1395 /* signals are disabled. */
1397 /* The client asserts that unallocated pages in the heap are never */
1400 /* Initialize virtual dirty bit implementation. */
1401 void GC_dirty_init()
1403 GC_dirty_maintained = TRUE;
1406 /* Retrieve system dirty bits for heap to a local buffer. */
1407 /* Restore the systems notion of which pages are dirty. */
1408 void GC_read_dirty()
1411 /* Is the HBLKSIZE sized page at h marked dirty in the local buffer? */
1412 /* If the actual page size is different, this returns TRUE if any */
1413 /* of the pages overlapping h are dirty. This routine may err on the */
1414 /* side of labelling pages as dirty (and this implementation does). */
1416 GC_bool GC_page_was_dirty(h)
1423 * The following two routines are typically less crucial. They matter
1424 * most with large dynamic libraries, or if we can't accurately identify
1425 * stacks, e.g. under Solaris 2.X. Otherwise the following default
1426 * versions are adequate.
1429 /* Could any valid GC heap pointer ever have been written to this page? */
1431 GC_bool GC_page_was_ever_dirty(h)
1437 /* Reset the n pages starting at h to "was never dirty" status. */
1438 void GC_is_fresh(h, n)
1444 /* A call hints that h is about to be written. */
1445 /* May speed up some dirty bit implementations. */
1447 void GC_write_hint(h)
1452 # endif /* DEFAULT_VDB */
1455 # ifdef MPROTECT_VDB
1458 * See DEFAULT_VDB for interface descriptions.
1462 * This implementation maintains dirty bits itself by catching write
1463 * faults and keeping track of them. We assume nobody else catches
1464 * SIGBUS or SIGSEGV. We assume no write faults occur in system calls
1465 * except as a result of a read system call. This means clients must
1466 * either ensure that system calls do not touch the heap, or must
1467 * provide their own wrappers analogous to the one for read.
1468 * We assume the page size is a multiple of HBLKSIZE.
1469 * This implementation is currently SunOS 4.X and IRIX 5.X specific, though we
1470 * tried to use portable code where easily possible. It is known
1471 * not to work under a number of other systems.
1476 # include <sys/mman.h>
1477 # include <signal.h>
1478 # include <sys/syscall.h>
1480 # define PROTECT(addr, len) \
1481 if (mprotect((caddr_t)(addr), (int)(len), \
1482 PROT_READ | OPT_PROT_EXEC) < 0) { \
1483 ABORT("mprotect failed"); \
1485 # define UNPROTECT(addr, len) \
1486 if (mprotect((caddr_t)(addr), (int)(len), \
1487 PROT_WRITE | PROT_READ | OPT_PROT_EXEC ) < 0) { \
1488 ABORT("un-mprotect failed"); \
1493 # include <signal.h>
1495 static DWORD protect_junk;
1496 # define PROTECT(addr, len) \
1497 if (!VirtualProtect((addr), (len), PAGE_EXECUTE_READ, \
1499 DWORD last_error = GetLastError(); \
1500 GC_printf1("Last error code: %lx\n", last_error); \
1501 ABORT("VirtualProtect failed"); \
1503 # define UNPROTECT(addr, len) \
1504 if (!VirtualProtect((addr), (len), PAGE_EXECUTE_READWRITE, \
1506 ABORT("un-VirtualProtect failed"); \
1511 VOLATILE page_hash_table GC_dirty_pages;
1512 /* Pages dirtied since last GC_read_dirty. */
1514 #if defined(SUNOS4) || defined(FREEBSD)
1515 typedef void (* SIG_PF)();
1517 #if defined(SUNOS5SIGS) || defined(OSF1) || defined(LINUX)
1518 typedef void (* SIG_PF)(int);
1520 #if defined(MSWIN32)
1521 typedef LPTOP_LEVEL_EXCEPTION_FILTER SIG_PF;
1523 # define SIG_DFL (LPTOP_LEVEL_EXCEPTION_FILTER) (-1)
1526 #if defined(IRIX5) || defined(OSF1)
1527 typedef void (* REAL_SIG_PF)(int, int, struct sigcontext *);
1529 #if defined(SUNOS5SIGS)
1530 typedef void (* REAL_SIG_PF)(int, struct siginfo *, void *);
1533 # include <linux/version.h>
1534 # if (LINUX_VERSION_CODE >= 0x20100)
1535 typedef void (* REAL_SIG_PF)(int, struct sigcontext);
1537 typedef void (* REAL_SIG_PF)(int, struct sigcontext_struct);
1541 SIG_PF GC_old_bus_handler;
1542 SIG_PF GC_old_segv_handler; /* Also old MSWIN32 ACCESS_VIOLATION filter */
1545 # if defined (SUNOS4) || defined(FREEBSD)
1546 void GC_write_fault_handler(sig, code, scp, addr)
1548 struct sigcontext *scp;
1551 # define SIG_OK (sig == SIGSEGV || sig == SIGBUS)
1552 # define CODE_OK (FC_CODE(code) == FC_PROT \
1553 || (FC_CODE(code) == FC_OBJERR \
1554 && FC_ERRNO(code) == FC_PROT))
1557 # define SIG_OK (sig == SIGBUS)
1558 # define CODE_OK (code == BUS_PAGE_FAULT)
1561 # if defined(IRIX5) || defined(OSF1)
1563 void GC_write_fault_handler(int sig, int code, struct sigcontext *scp)
1564 # define SIG_OK (sig == SIGSEGV)
1566 # define CODE_OK (code == 2 /* experimentally determined */)
1569 # define CODE_OK (code == EACCES)
1573 # if (LINUX_VERSION_CODE >= 0x20100)
1574 void GC_write_fault_handler(int sig, struct sigcontext sc)
1576 void GC_write_fault_handler(int sig, struct sigcontext_struct sc)
1578 # define SIG_OK (sig == SIGSEGV)
1579 # define CODE_OK TRUE
1580 /* Empirically c.trapno == 14, but is that useful? */
1581 /* We assume Intel architecture, so alignment */
1582 /* faults are not possible. */
1584 # if defined(SUNOS5SIGS)
1585 void GC_write_fault_handler(int sig, struct siginfo *scp, void * context)
1586 # define SIG_OK (sig == SIGSEGV)
1587 # define CODE_OK (scp -> si_code == SEGV_ACCERR)
1589 # if defined(MSWIN32)
1590 LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info)
1591 # define SIG_OK (exc_info -> ExceptionRecord -> ExceptionCode == \
1592 EXCEPTION_ACCESS_VIOLATION)
1593 # define CODE_OK (exc_info -> ExceptionRecord -> ExceptionInformation[0] == 1)
1597 register unsigned i;
1599 char * addr = (char *) (size_t) (scp -> sc_badvaddr);
1601 # if defined(OSF1) && defined(ALPHA)
1602 char * addr = (char *) (scp -> sc_traparg_a0);
1605 char * addr = (char *) (scp -> si_addr);
1609 char * addr = (char *) (sc.cr2);
1611 char * addr = /* As of 1.3.90 there seemed to be no way to do this. */;
1614 # if defined(MSWIN32)
1615 char * addr = (char *) (exc_info -> ExceptionRecord
1616 -> ExceptionInformation[1]);
1617 # define sig SIGSEGV
1620 if (SIG_OK && CODE_OK) {
1621 register struct hblk * h =
1622 (struct hblk *)((word)addr & ~(GC_page_size-1));
1623 GC_bool in_allocd_block;
1626 /* Address is only within the correct physical page. */
1627 in_allocd_block = FALSE;
1628 for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
1629 if (HDR(h+i) != 0) {
1630 in_allocd_block = TRUE;
1634 in_allocd_block = (HDR(addr) != 0);
1636 if (!in_allocd_block) {
1637 /* Heap blocks now begin and end on page boundaries */
1640 if (sig == SIGSEGV) {
1641 old_handler = GC_old_segv_handler;
1643 old_handler = GC_old_bus_handler;
1645 if (old_handler == SIG_DFL) {
1647 ABORT("Unexpected bus error or segmentation fault");
1649 return(EXCEPTION_CONTINUE_SEARCH);
1652 # if defined (SUNOS4) || defined(FREEBSD)
1653 (*old_handler) (sig, code, scp, addr);
1656 # if defined (SUNOS5SIGS)
1657 (*(REAL_SIG_PF)old_handler) (sig, scp, context);
1660 # if defined (LINUX)
1661 (*(REAL_SIG_PF)old_handler) (sig, sc);
1664 # if defined (IRIX5) || defined(OSF1)
1665 (*(REAL_SIG_PF)old_handler) (sig, code, scp);
1669 return((*old_handler)(exc_info));
1673 for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
1674 register int index = PHT_HASH(h+i);
1676 set_pht_entry_from_index(GC_dirty_pages, index);
1678 UNPROTECT(h, GC_page_size);
1679 # if defined(OSF1) || defined(LINUX)
1680 /* These reset the signal handler each time by default. */
1681 signal(SIGSEGV, (SIG_PF) GC_write_fault_handler);
1683 /* The write may not take place before dirty bits are read. */
1684 /* But then we'll fault again ... */
1686 return(EXCEPTION_CONTINUE_EXECUTION);
1692 return EXCEPTION_CONTINUE_SEARCH;
1694 ABORT("Unexpected bus error or segmentation fault");
1699 * We hold the allocation lock. We expect block h to be written
1702 void GC_write_hint(h)
1705 register struct hblk * h_trunc;
1706 register unsigned i;
1707 register GC_bool found_clean;
1709 if (!GC_dirty_maintained) return;
1710 h_trunc = (struct hblk *)((word)h & ~(GC_page_size-1));
1711 found_clean = FALSE;
1712 for (i = 0; i < divHBLKSZ(GC_page_size); i++) {
1713 register int index = PHT_HASH(h_trunc+i);
1715 if (!get_pht_entry_from_index(GC_dirty_pages, index)) {
1717 set_pht_entry_from_index(GC_dirty_pages, index);
1721 UNPROTECT(h_trunc, GC_page_size);
1725 void GC_dirty_init()
1727 #if defined(SUNOS5SIGS) || defined(IRIX5)
1728 struct sigaction act, oldact;
1730 act.sa_flags = SA_RESTART;
1731 act.sa_handler = GC_write_fault_handler;
1733 act.sa_flags = SA_RESTART | SA_SIGINFO;
1734 act.sa_sigaction = GC_write_fault_handler;
1736 (void)sigemptyset(&act.sa_mask);
1739 GC_printf0("Inititalizing mprotect virtual dirty bit implementation\n");
1741 GC_dirty_maintained = TRUE;
1742 if (GC_page_size % HBLKSIZE != 0) {
1743 GC_err_printf0("Page size not multiple of HBLKSIZE\n");
1744 ABORT("Page size not multiple of HBLKSIZE");
1746 # if defined(SUNOS4) || defined(FREEBSD)
1747 GC_old_bus_handler = signal(SIGBUS, GC_write_fault_handler);
1748 if (GC_old_bus_handler == SIG_IGN) {
1749 GC_err_printf0("Previously ignored bus error!?");
1750 GC_old_bus_handler = SIG_DFL;
1752 if (GC_old_bus_handler != SIG_DFL) {
1754 GC_err_printf0("Replaced other SIGBUS handler\n");
1758 # if defined(OSF1) || defined(SUNOS4) || defined(LINUX)
1759 GC_old_segv_handler = signal(SIGSEGV, (SIG_PF)GC_write_fault_handler);
1760 if (GC_old_segv_handler == SIG_IGN) {
1761 GC_err_printf0("Previously ignored segmentation violation!?");
1762 GC_old_segv_handler = SIG_DFL;
1764 if (GC_old_segv_handler != SIG_DFL) {
1766 GC_err_printf0("Replaced other SIGSEGV handler\n");
1770 # if defined(SUNOS5SIGS) || defined(IRIX5)
1771 # ifdef IRIX_THREADS
1772 sigaction(SIGSEGV, 0, &oldact);
1773 sigaction(SIGSEGV, &act, 0);
1775 sigaction(SIGSEGV, &act, &oldact);
1777 # if defined(_sigargs)
1778 /* This is Irix 5.x, not 6.x. Irix 5.x does not have */
1780 GC_old_segv_handler = oldact.sa_handler;
1781 # else /* Irix 6.x or SUNOS5SIGS */
1782 if (oldact.sa_flags & SA_SIGINFO) {
1783 GC_old_segv_handler = (SIG_PF)(oldact.sa_sigaction);
1785 GC_old_segv_handler = oldact.sa_handler;
1788 if (GC_old_segv_handler == SIG_IGN) {
1789 GC_err_printf0("Previously ignored segmentation violation!?");
1790 GC_old_segv_handler = SIG_DFL;
1792 if (GC_old_segv_handler != SIG_DFL) {
1794 GC_err_printf0("Replaced other SIGSEGV handler\n");
1798 # if defined(MSWIN32)
1799 GC_old_segv_handler = SetUnhandledExceptionFilter(GC_write_fault_handler);
1800 if (GC_old_segv_handler != NULL) {
1802 GC_err_printf0("Replaced other UnhandledExceptionFilter\n");
1805 GC_old_segv_handler = SIG_DFL;
1812 void GC_protect_heap()
1818 for (i = 0; i < GC_n_heap_sects; i++) {
1819 start = GC_heap_sects[i].hs_start;
1820 len = GC_heap_sects[i].hs_bytes;
1821 PROTECT(start, len);
1825 /* We assume that either the world is stopped or its OK to lose dirty */
1826 /* bits while this is happenning (as in GC_enable_incremental). */
1827 void GC_read_dirty()
1829 BCOPY((word *)GC_dirty_pages, GC_grungy_pages,
1830 (sizeof GC_dirty_pages));
1831 BZERO((word *)GC_dirty_pages, (sizeof GC_dirty_pages));
1835 GC_bool GC_page_was_dirty(h)
1838 register word index = PHT_HASH(h);
1840 return(HDR(h) == 0 || get_pht_entry_from_index(GC_grungy_pages, index));
1844 * Acquiring the allocation lock here is dangerous, since this
1845 * can be called from within GC_call_with_alloc_lock, and the cord
1846 * package does so. On systems that allow nested lock acquisition, this
1848 * On other systems, SET_LOCK_HOLDER and friends must be suitably defined.
1851 void GC_begin_syscall()
1853 if (!I_HOLD_LOCK()) LOCK();
1856 void GC_end_syscall()
1858 if (!I_HOLD_LOCK()) UNLOCK();
1861 void GC_unprotect_range(addr, len)
1865 struct hblk * start_block;
1866 struct hblk * end_block;
1867 register struct hblk *h;
1870 if (!GC_incremental) return;
1871 obj_start = GC_base(addr);
1872 if (obj_start == 0) return;
1873 if (GC_base(addr + len - 1) != obj_start) {
1874 ABORT("GC_unprotect_range(range bigger than object)");
1876 start_block = (struct hblk *)((word)addr & ~(GC_page_size - 1));
1877 end_block = (struct hblk *)((word)(addr + len - 1) & ~(GC_page_size - 1));
1878 end_block += GC_page_size/HBLKSIZE - 1;
1879 for (h = start_block; h <= end_block; h++) {
1880 register word index = PHT_HASH(h);
1882 set_pht_entry_from_index(GC_dirty_pages, index);
1884 UNPROTECT(start_block,
1885 ((ptr_t)end_block - (ptr_t)start_block) + HBLKSIZE);
1889 /* Replacement for UNIX system call. */
1890 /* Other calls that write to the heap */
1891 /* should be handled similarly. */
1892 # if defined(__STDC__) && !defined(SUNOS4)
1893 # include <unistd.h>
1894 ssize_t read(int fd, void *buf, size_t nbyte)
1897 int read(fd, buf, nbyte)
1899 int GC_read(fd, buf, nbyte)
1909 GC_unprotect_range(buf, (word)nbyte);
1911 /* Indirect system call may not always be easily available. */
1912 /* We could call _read, but that would interfere with the */
1913 /* libpthread interception of read. */
1918 iov.iov_len = nbyte;
1919 result = readv(fd, &iov, 1);
1922 result = syscall(SYS_read, fd, buf, nbyte);
1927 #endif /* !MSWIN32 */
1930 GC_bool GC_page_was_ever_dirty(h)
1936 /* Reset the n pages starting at h to "was never dirty" status. */
1938 void GC_is_fresh(h, n)
1944 # endif /* MPROTECT_VDB */
1949 * See DEFAULT_VDB for interface descriptions.
1953 * This implementaion assumes a Solaris 2.X like /proc pseudo-file-system
1954 * from which we can read page modified bits. This facility is far from
1955 * optimal (e.g. we would like to get the info for only some of the
1956 * address space), but it avoids intercepting system calls.
1960 #include <sys/types.h>
1961 #include <sys/signal.h>
1962 #include <sys/fault.h>
1963 #include <sys/syscall.h>
1964 #include <sys/procfs.h>
1965 #include <sys/stat.h>
1968 #define INITIAL_BUF_SZ 4096
1969 word GC_proc_buf_size = INITIAL_BUF_SZ;
1972 page_hash_table GC_written_pages = { 0 }; /* Pages ever dirtied */
1974 #ifdef SOLARIS_THREADS
1975 /* We don't have exact sp values for threads. So we count on */
1976 /* occasionally declaring stack pages to be fresh. Thus we */
1977 /* need a real implementation of GC_is_fresh. We can't clear */
1978 /* entries in GC_written_pages, since that would declare all */
1979 /* pages with the given hash address to be fresh. */
1980 # define MAX_FRESH_PAGES 8*1024 /* Must be power of 2 */
1981 struct hblk ** GC_fresh_pages; /* A direct mapped cache. */
1982 /* Collisions are dropped. */
1984 # define FRESH_PAGE_SLOT(h) (divHBLKSZ((word)(h)) & (MAX_FRESH_PAGES-1))
1985 # define ADD_FRESH_PAGE(h) \
1986 GC_fresh_pages[FRESH_PAGE_SLOT(h)] = (h)
1987 # define PAGE_IS_FRESH(h) \
1988 (GC_fresh_pages[FRESH_PAGE_SLOT(h)] == (h) && (h) != 0)
1991 /* Add all pages in pht2 to pht1 */
1992 void GC_or_pages(pht1, pht2)
1993 page_hash_table pht1, pht2;
1997 for (i = 0; i < PHT_SIZE; i++) pht1[i] |= pht2[i];
2002 void GC_dirty_init()
2007 GC_dirty_maintained = TRUE;
2008 if (GC_words_allocd != 0 || GC_words_allocd_before_gc != 0) {
2011 for (i = 0; i < PHT_SIZE; i++) GC_written_pages[i] = (word)(-1);
2013 GC_printf1("Allocated words:%lu:all pages may have been written\n",
2015 (GC_words_allocd + GC_words_allocd_before_gc));
2018 sprintf(buf, "/proc/%d", getpid());
2019 fd = open(buf, O_RDONLY);
2021 ABORT("/proc open failed");
2023 GC_proc_fd = syscall(SYS_ioctl, fd, PIOCOPENPD, 0);
2025 if (GC_proc_fd < 0) {
2026 ABORT("/proc ioctl failed");
2028 GC_proc_buf = GC_scratch_alloc(GC_proc_buf_size);
2029 # ifdef SOLARIS_THREADS
2030 GC_fresh_pages = (struct hblk **)
2031 GC_scratch_alloc(MAX_FRESH_PAGES * sizeof (struct hblk *));
2032 if (GC_fresh_pages == 0) {
2033 GC_err_printf0("No space for fresh pages\n");
2036 BZERO(GC_fresh_pages, MAX_FRESH_PAGES * sizeof (struct hblk *));
2040 /* Ignore write hints. They don't help us here. */
2042 void GC_write_hint(h)
2047 #ifdef SOLARIS_THREADS
2048 # define READ(fd,buf,nbytes) syscall(SYS_read, fd, buf, nbytes)
2050 # define READ(fd,buf,nbytes) read(fd, buf, nbytes)
2053 void GC_read_dirty()
2055 unsigned long ps, np;
2058 struct prasmap * map;
2060 ptr_t current_addr, limit;
2064 BZERO(GC_grungy_pages, (sizeof GC_grungy_pages));
2067 if (READ(GC_proc_fd, bufp, GC_proc_buf_size) <= 0) {
2069 GC_printf1("/proc read failed: GC_proc_buf_size = %lu\n",
2073 /* Retry with larger buffer. */
2074 word new_size = 2 * GC_proc_buf_size;
2075 char * new_buf = GC_scratch_alloc(new_size);
2078 GC_proc_buf = bufp = new_buf;
2079 GC_proc_buf_size = new_size;
2081 if (syscall(SYS_read, GC_proc_fd, bufp, GC_proc_buf_size) <= 0) {
2082 WARN("Insufficient space for /proc read\n", 0);
2084 memset(GC_grungy_pages, 0xff, sizeof (page_hash_table));
2085 memset(GC_written_pages, 0xff, sizeof(page_hash_table));
2086 # ifdef SOLARIS_THREADS
2087 BZERO(GC_fresh_pages,
2088 MAX_FRESH_PAGES * sizeof (struct hblk *));
2094 /* Copy dirty bits into GC_grungy_pages */
2095 nmaps = ((struct prpageheader *)bufp) -> pr_nmap;
2096 /* printf( "nmaps = %d, PG_REFERENCED = %d, PG_MODIFIED = %d\n",
2097 nmaps, PG_REFERENCED, PG_MODIFIED); */
2098 bufp = bufp + sizeof(struct prpageheader);
2099 for (i = 0; i < nmaps; i++) {
2100 map = (struct prasmap *)bufp;
2101 vaddr = (ptr_t)(map -> pr_vaddr);
2102 ps = map -> pr_pagesize;
2103 np = map -> pr_npage;
2104 /* printf("vaddr = 0x%X, ps = 0x%X, np = 0x%X\n", vaddr, ps, np); */
2105 limit = vaddr + ps * np;
2106 bufp += sizeof (struct prasmap);
2107 for (current_addr = vaddr;
2108 current_addr < limit; current_addr += ps){
2109 if ((*bufp++) & PG_MODIFIED) {
2110 register struct hblk * h = (struct hblk *) current_addr;
2112 while ((ptr_t)h < current_addr + ps) {
2113 register word index = PHT_HASH(h);
2115 set_pht_entry_from_index(GC_grungy_pages, index);
2116 # ifdef SOLARIS_THREADS
2118 register int slot = FRESH_PAGE_SLOT(h);
2120 if (GC_fresh_pages[slot] == h) {
2121 GC_fresh_pages[slot] = 0;
2129 bufp += sizeof(long) - 1;
2130 bufp = (char *)((unsigned long)bufp & ~(sizeof(long)-1));
2132 /* Update GC_written_pages. */
2133 GC_or_pages(GC_written_pages, GC_grungy_pages);
2134 # ifdef SOLARIS_THREADS
2135 /* Make sure that old stacks are considered completely clean */
2136 /* unless written again. */
2137 GC_old_stacks_are_fresh();
2143 GC_bool GC_page_was_dirty(h)
2146 register word index = PHT_HASH(h);
2147 register GC_bool result;
2149 result = get_pht_entry_from_index(GC_grungy_pages, index);
2150 # ifdef SOLARIS_THREADS
2151 if (result && PAGE_IS_FRESH(h)) result = FALSE;
2152 /* This happens only if page was declared fresh since */
2153 /* the read_dirty call, e.g. because it's in an unused */
2154 /* thread stack. It's OK to treat it as clean, in */
2155 /* that case. And it's consistent with */
2156 /* GC_page_was_ever_dirty. */
2161 GC_bool GC_page_was_ever_dirty(h)
2164 register word index = PHT_HASH(h);
2165 register GC_bool result;
2167 result = get_pht_entry_from_index(GC_written_pages, index);
2168 # ifdef SOLARIS_THREADS
2169 if (result && PAGE_IS_FRESH(h)) result = FALSE;
2174 /* Caller holds allocation lock. */
2175 void GC_is_fresh(h, n)
2180 register word index;
2182 # ifdef SOLARIS_THREADS
2185 if (GC_fresh_pages != 0) {
2186 for (i = 0; i < n; i++) {
2187 ADD_FRESH_PAGE(h + i);
2193 # endif /* PROC_VDB */
2198 # include "vd/PCR_VD.h"
2200 # define NPAGES (32*1024) /* 128 MB */
2202 PCR_VD_DB GC_grungy_bits[NPAGES];
2204 ptr_t GC_vd_base; /* Address corresponding to GC_grungy_bits[0] */
2205 /* HBLKSIZE aligned. */
2207 void GC_dirty_init()
2209 GC_dirty_maintained = TRUE;
2210 /* For the time being, we assume the heap generally grows up */
2211 GC_vd_base = GC_heap_sects[0].hs_start;
2212 if (GC_vd_base == 0) {
2213 ABORT("Bad initial heap segment");
2215 if (PCR_VD_Start(HBLKSIZE, GC_vd_base, NPAGES*HBLKSIZE)
2217 ABORT("dirty bit initialization failed");
2221 void GC_read_dirty()
2223 /* lazily enable dirty bits on newly added heap sects */
2225 static int onhs = 0;
2226 int nhs = GC_n_heap_sects;
2227 for( ; onhs < nhs; onhs++ ) {
2228 PCR_VD_WriteProtectEnable(
2229 GC_heap_sects[onhs].hs_start,
2230 GC_heap_sects[onhs].hs_bytes );
2235 if (PCR_VD_Clear(GC_vd_base, NPAGES*HBLKSIZE, GC_grungy_bits)
2237 ABORT("dirty bit read failed");
2241 GC_bool GC_page_was_dirty(h)
2244 if((ptr_t)h < GC_vd_base || (ptr_t)h >= GC_vd_base + NPAGES*HBLKSIZE) {
2247 return(GC_grungy_bits[h - (struct hblk *)GC_vd_base] & PCR_VD_DB_dirtyBit);
2251 void GC_write_hint(h)
2254 PCR_VD_WriteProtectDisable(h, HBLKSIZE);
2255 PCR_VD_WriteProtectEnable(h, HBLKSIZE);
2258 # endif /* PCR_VDB */
2261 * Call stack save code for debugging.
2262 * Should probably be in mach_dep.c, but that requires reorganization.
2265 # if defined(SUNOS4)
2266 # include <machine/frame.h>
2268 # if defined (DRSNX)
2269 # include <sys/sparc/frame.h>
2271 # include <sys/frame.h>
2275 --> We only know how to to get the first 6 arguments
2278 #ifdef SAVE_CALL_CHAIN
2279 /* Fill in the pc and argument information for up to NFRAMES of my */
2280 /* callers. Ignore my frame and my callers frame. */
2281 void GC_save_callers (info)
2282 struct callinfo info[NFRAMES];
2284 struct frame *frame;
2287 word GC_save_regs_in_stack();
2289 frame = (struct frame *) GC_save_regs_in_stack ();
2291 for (fp = frame -> fr_savfp; fp != 0 && nframes < NFRAMES;
2292 fp = fp -> fr_savfp, nframes++) {
2295 info[nframes].ci_pc = fp->fr_savpc;
2296 for (i = 0; i < NARGS; i++) {
2297 info[nframes].ci_arg[i] = ~(fp->fr_arg[i]);
2300 if (nframes < NFRAMES) info[nframes].ci_pc = 0;
2303 #endif /* SAVE_CALL_CHAIN */