2 * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
3 * Copyright (c) 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.
14 * Original author: Bill Janssen
15 * Heavily modified by Hans Boehm and others
19 * This is incredibly OS specific code for tracking down data sections in
20 * dynamic libraries. There appears to be no way of doing this quickly
21 * without groveling through undocumented data structures. We would argue
22 * that this is a bug in the design of the dlopen interface. THIS CODE
23 * MAY BREAK IN FUTURE OS RELEASES. If this matters to you, don't hesitate
24 * to let your vendor know ...
26 * None of this is safe with dlclose and incremental collection.
27 * But then not much of anything is safe in the presence of dlclose.
32 #if (defined(__linux__) || defined(__GLIBC__)) && !defined(_GNU_SOURCE)
33 /* Can't test LINUX, since this must be define before other includes */
36 #if !defined(MACOS) && !defined(_WIN32_WCE)
37 # include <sys/types.h>
39 #include "private/gc_priv.h"
41 /* BTL: avoid circular redefinition of dlopen if GC_SOLARIS_THREADS defined */
42 # if (defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS)) \
43 && defined(dlopen) && !defined(GC_USE_LD_WRAP)
44 /* To support threads in Solaris, gc.h interposes on dlopen by */
45 /* defining "dlopen" to be "GC_dlopen", which is implemented below. */
46 /* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the */
47 /* real system dlopen() in their implementation. We first remove */
48 /* gc.h's dlopen definition and restore it later, after GC_dlopen(). */
50 # define GC_must_restore_redefined_dlopen
52 # undef GC_must_restore_redefined_dlopen
55 #if (defined(DYNAMIC_LOADING) || defined(MSWIN32) || defined(MSWINCE)) \
57 #if !defined(SUNOS4) && !defined(SUNOS5DL) && !defined(IRIX5) && \
58 !defined(MSWIN32) && !defined(MSWINCE) && \
59 !(defined(ALPHA) && defined(OSF1)) && \
60 !defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \
61 !defined(RS6000) && !defined(SCO_ELF) && !defined(DGUX) && \
62 !(defined(FREEBSD) && defined(__ELF__)) && \
63 !(defined(NETBSD) && defined(__ELF__)) && !defined(HURD) && \
65 --> We only know how to find data segments of dynamic libraries for the
66 --> above. Additional SVR4 variants might not be too
80 /* struct link_map field overrides */
81 # define l_next lm_next
82 # define l_addr lm_addr
83 # define l_name lm_name
87 # include <machine/elf_machdep.h>
88 # define ELFSIZE ARCH_ELFSIZE
91 #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \
92 (defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \
93 (defined(NETBSD) && defined(__ELF__)) || defined(HURD)
99 /* Newer versions of GNU/Linux define this macro. We
100 * define it similarly for any ELF systems that don't. */
102 # if defined(FREEBSD)
103 # if __ELF_WORD_SIZE == 32
104 # define ElfW(type) Elf32_##type
106 # define ElfW(type) Elf64_##type
111 # define ElfW(type) Elf32_##type
113 # define ElfW(type) Elf64_##type
116 # if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32
117 # define ElfW(type) Elf32_##type
119 # define ElfW(type) Elf64_##type
125 #if defined(SUNOS5DL) && !defined(USE_PROC_FOR_LIBRARIES)
131 static struct link_map *
132 GC_FirstDLOpenedLinkMap()
134 extern ElfW(Dyn) _DYNAMIC;
137 static struct link_map * cachedResult = 0;
138 static ElfW(Dyn) *dynStructureAddr = 0;
139 /* BTL: added to avoid Solaris 5.3 ld.so _DYNAMIC bug */
141 # ifdef SUNOS53_SHARED_LIB
142 /* BTL: Avoid the Solaris 5.3 bug that _DYNAMIC isn't being set */
143 /* up properly in dynamically linked .so's. This means we have */
144 /* to use its value in the set of original object files loaded */
145 /* at program startup. */
146 if( dynStructureAddr == 0 ) {
147 void* startupSyms = dlopen(0, RTLD_LAZY);
148 dynStructureAddr = (ElfW(Dyn)*)dlsym(startupSyms, "_DYNAMIC");
151 dynStructureAddr = &_DYNAMIC;
154 if( dynStructureAddr == 0) {
157 if( cachedResult == 0 ) {
159 for( dp = ((ElfW(Dyn) *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) {
160 if( tag == DT_DEBUG ) {
162 = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
163 if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
171 #endif /* SUNOS5DL ... */
173 /* BTL: added to fix circular dlopen definition if GC_SOLARIS_THREADS defined */
174 # if defined(GC_must_restore_redefined_dlopen)
175 # define dlopen GC_dlopen
178 #if defined(SUNOS4) && !defined(USE_PROC_FOR_LIBRARIES)
181 struct link_dynamic _DYNAMIC;
184 static struct link_map *
185 GC_FirstDLOpenedLinkMap()
187 extern struct link_dynamic _DYNAMIC;
189 if( &_DYNAMIC == 0) {
192 return(_DYNAMIC.ld_un.ld_1->ld_loaded);
195 /* Return the address of the ld.so allocated common symbol */
196 /* with the least address, or 0 if none. */
197 static ptr_t GC_first_common()
200 extern struct link_dynamic _DYNAMIC;
201 struct rtc_symb * curr_symbol;
203 if( &_DYNAMIC == 0) {
206 curr_symbol = _DYNAMIC.ldd -> ldd_cp;
207 for (; curr_symbol != 0; curr_symbol = curr_symbol -> rtc_next) {
209 || (ptr_t)(curr_symbol -> rtc_sp -> n_value) < result) {
210 result = (ptr_t)(curr_symbol -> rtc_sp -> n_value);
216 #endif /* SUNOS4 ... */
218 # if defined(SUNOS4) || defined(SUNOS5DL)
219 /* Add dynamic library data sections to the root set. */
220 # if !defined(PCR) && !defined(GC_SOLARIS_THREADS) && defined(THREADS)
222 --> fix mutual exclusion with dlopen
223 # endif /* We assume M3 programs don't call dlopen for now */
226 # ifndef USE_PROC_FOR_LIBRARIES
227 void GC_register_dynamic_libraries()
229 struct link_map *lm = GC_FirstDLOpenedLinkMap();
232 for (lm = GC_FirstDLOpenedLinkMap();
233 lm != (struct link_map *) 0; lm = lm->l_next)
238 e = (struct exec *) lm->lm_addr;
240 ((char *) (N_DATOFF(*e) + lm->lm_addr)),
241 ((char *) (N_BSSADDR(*e) + e->a_bss + lm->lm_addr)),
247 unsigned long offset;
251 e = (ElfW(Ehdr) *) lm->l_addr;
252 p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
253 offset = ((unsigned long)(lm->l_addr));
254 for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
255 switch( p->p_type ) {
258 if( !(p->p_flags & PF_W) ) break;
259 start = ((char *)(p->p_vaddr)) + offset;
275 static ptr_t common_start = 0;
277 extern ptr_t GC_find_limit();
279 if (common_start == 0) common_start = GC_first_common();
280 if (common_start != 0) {
281 common_end = GC_find_limit(common_start, TRUE);
282 GC_add_roots_inner((char *)common_start, (char *)common_end, TRUE);
288 # endif /* !USE_PROC ... */
291 #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \
292 (defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \
293 (defined(NETBSD) && defined(__ELF__)) || defined(HURD)
296 #ifdef USE_PROC_FOR_LIBRARIES
300 #include <sys/stat.h>
304 #define MAPS_BUF_SIZE (32*1024)
306 extern ssize_t GC_repeat_read(int fd, char *buf, size_t count);
307 /* Repeatedly read until buffer is filled, or EOF is encountered */
308 /* Defined in os_dep.c. */
310 char *GC_parse_map_entry(char *buf_ptr, word *start, word *end,
311 char *prot_buf, unsigned int *maj_dev);
312 word GC_apply_to_maps(word (*fn)(char *));
315 word GC_register_map_entries(char *maps)
318 char *buf_ptr = maps;
321 unsigned int maj_dev;
322 word least_ha, greatest_ha;
324 word datastart = (word)(DATASTART);
326 /* Compute heap bounds. FIXME: Should be done by add_to_heap? */
327 least_ha = (word)(-1);
329 for (i = 0; i < GC_n_heap_sects; ++i) {
330 word sect_start = (word)GC_heap_sects[i].hs_start;
331 word sect_end = sect_start + GC_heap_sects[i].hs_bytes;
332 if (sect_start < least_ha) least_ha = sect_start;
333 if (sect_end > greatest_ha) greatest_ha = sect_end;
335 if (greatest_ha < (word)GC_scratch_last_end_ptr)
336 greatest_ha = (word)GC_scratch_last_end_ptr;
339 buf_ptr = GC_parse_map_entry(buf_ptr, &start, &end, prot_buf, &maj_dev);
340 if (buf_ptr == NULL) return 1;
341 if (prot_buf[1] == 'w') {
342 /* This is a writable mapping. Add it to */
343 /* the root set unless it is already otherwise */
345 if (start <= (word)GC_stackbottom && end >= (word)GC_stackbottom) {
346 /* Stack mapping; discard */
350 if (GC_segment_is_thread_stack(start, end)) continue;
352 /* We no longer exclude the main data segment. */
353 if (start < least_ha && end > least_ha) {
356 if (start < greatest_ha && end > greatest_ha) {
359 if (start >= least_ha && end <= greatest_ha) continue;
360 GC_add_roots_inner((char *)start, (char *)end, TRUE);
366 void GC_register_dynamic_libraries()
368 if (!GC_apply_to_maps(GC_register_map_entries))
369 ABORT("Failed to read /proc for library registration.");
372 /* We now take care of the main data segment ourselves: */
373 GC_bool GC_register_main_static_data()
378 # define HAVE_REGISTER_MAIN_STATIC_DATA
380 #endif /* USE_PROC_FOR_LIBRARIES */
382 #if !defined(USE_PROC_FOR_LIBRARIES)
383 /* The following is the preferred way to walk dynamic libraries */
384 /* For glibc 2.2.4+. Unfortunately, it doesn't work for older */
385 /* versions. Thanks to Jakub Jelinek for most of the code. */
387 # if (defined(LINUX) || defined (__GLIBC__)) /* Are others OK here, too? */ \
388 && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
389 || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
391 /* We have the header files for a glibc that includes dl_iterate_phdr. */
392 /* It may still not be available in the library on the target system. */
393 /* Thus we also treat it as a weak symbol. */
394 #define HAVE_DL_ITERATE_PHDR
396 static int GC_register_dynlib_callback(info, size, ptr)
397 struct dl_phdr_info * info;
401 const ElfW(Phdr) * p;
405 /* Make sure struct dl_phdr_info is at least as big as we need. */
406 if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
407 + sizeof (info->dlpi_phnum))
411 for( i = 0; i < (int)(info->dlpi_phnum); ((i++),(p++)) ) {
412 switch( p->p_type ) {
415 if( !(p->p_flags & PF_W) ) break;
416 start = ((char *)(p->p_vaddr)) + info->dlpi_addr;
417 GC_add_roots_inner(start, start + p->p_memsz, TRUE);
425 * (int *)ptr = 1; /* Signal that we were called */
429 /* Return TRUE if we succeed, FALSE if dl_iterate_phdr wasn't there. */
431 #pragma weak dl_iterate_phdr
433 GC_bool GC_register_dynamic_libraries_dl_iterate_phdr()
435 if (dl_iterate_phdr) {
436 int did_something = 0;
437 dl_iterate_phdr(GC_register_dynlib_callback, &did_something);
438 if (!did_something) {
439 /* dl_iterate_phdr may forget the static data segment in */
440 /* statically linked executables. */
441 GC_add_roots_inner(DATASTART, (char *)(DATAEND), TRUE);
442 # if defined(DATASTART2)
443 GC_add_roots_inner(DATASTART2, (char *)(DATAEND2), TRUE);
453 /* Do we need to separately register the main static data segment? */
454 GC_bool GC_register_main_static_data()
456 return (dl_iterate_phdr == 0);
459 #define HAVE_REGISTER_MAIN_STATIC_DATA
461 # else /* !LINUX || version(glibc) < 2.2.4 */
463 /* Dynamic loading code for Linux running ELF. Somewhat tested on
464 * Linux/x86, untested but hopefully should work on Linux/Alpha.
465 * This code was derived from the Solaris/ELF support. Thanks to
466 * whatever kind soul wrote that. - Patrick Bridges */
468 /* This doesn't necessarily work in all cases, e.g. with preloaded
469 * dynamic libraries. */
472 # include <sys/exec_elf.h>
473 /* for compatibility with 1.4.x */
491 # pragma weak _DYNAMIC
493 extern ElfW(Dyn) _DYNAMIC[];
495 static struct link_map *
496 GC_FirstDLOpenedLinkMap()
499 static struct link_map *cachedResult = 0;
504 if( cachedResult == 0 ) {
506 for( dp = _DYNAMIC; (tag = dp->d_tag) != 0; dp++ ) {
507 /* FIXME: The DT_DEBUG header is not mandated by the */
508 /* ELF spec. This code appears to be dependent on */
509 /* idiosynchracies of older GNU tool chains. If this code */
510 /* fails for you, the real problem is probably that it is */
511 /* being used at all. You should be getting the */
512 /* dl_iterate_phdr version. */
513 if( tag == DT_DEBUG ) {
515 = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
516 if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
525 void GC_register_dynamic_libraries()
530 # ifdef HAVE_DL_ITERATE_PHDR
531 if (GC_register_dynamic_libraries_dl_iterate_phdr()) {
535 lm = GC_FirstDLOpenedLinkMap();
536 for (lm = GC_FirstDLOpenedLinkMap();
537 lm != (struct link_map *) 0; lm = lm->l_next)
541 unsigned long offset;
545 e = (ElfW(Ehdr) *) lm->l_addr;
546 p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
547 offset = ((unsigned long)(lm->l_addr));
548 for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
549 switch( p->p_type ) {
552 if( !(p->p_flags & PF_W) ) break;
553 start = ((char *)(p->p_vaddr)) + offset;
554 GC_add_roots_inner(start, start + p->p_memsz, TRUE);
564 #endif /* !USE_PROC_FOR_LIBRARIES */
568 #if defined(IRIX5) || (defined(USE_PROC_FOR_LIBRARIES) && !defined(LINUX))
570 #include <sys/procfs.h>
571 #include <sys/stat.h>
575 #include <signal.h> /* Only for the following test. */
580 extern void * GC_roots_present();
581 /* The type is a lie, since the real type doesn't make sense here, */
582 /* and we only test for NULL. */
585 /* We use /proc to track down all parts of the address space that are */
586 /* mapped by the process, and throw out regions we know we shouldn't */
587 /* worry about. This may also work under other SVR4 variants. */
588 void GC_register_dynamic_libraries()
592 static prmap_t * addr_map = 0;
593 static int current_sz = 0; /* Number of records currently in addr_map */
594 static int needed_sz; /* Required size of addr_map */
597 register ptr_t start;
598 register ptr_t limit;
599 ptr_t heap_start = (ptr_t)HEAP_START;
600 ptr_t heap_end = heap_start;
604 # endif /* SUNOS5DL */
607 sprintf(buf, "/proc/%d", getpid());
608 /* The above generates a lint complaint, since pid_t varies. */
609 /* It's unclear how to improve this. */
610 fd = open(buf, O_RDONLY);
612 ABORT("/proc open failed");
615 if (ioctl(fd, PIOCNMAP, &needed_sz) < 0) {
616 GC_err_printf2("fd = %d, errno = %d\n", fd, errno);
617 ABORT("/proc PIOCNMAP ioctl failed");
619 if (needed_sz >= current_sz) {
620 current_sz = needed_sz * 2 + 1;
621 /* Expansion, plus room for 0 record */
622 addr_map = (prmap_t *)GC_scratch_alloc((word)
623 (current_sz * sizeof(prmap_t)));
625 if (ioctl(fd, PIOCMAP, addr_map) < 0) {
626 GC_err_printf4("fd = %d, errno = %d, needed_sz = %d, addr_map = 0x%X\n",
627 fd, errno, needed_sz, addr_map);
628 ABORT("/proc PIOCMAP ioctl failed");
630 if (GC_n_heap_sects > 0) {
631 heap_end = GC_heap_sects[GC_n_heap_sects-1].hs_start
632 + GC_heap_sects[GC_n_heap_sects-1].hs_bytes;
633 if (heap_end < GC_scratch_last_end_ptr) heap_end = GC_scratch_last_end_ptr;
635 for (i = 0; i < needed_sz; i++) {
636 flags = addr_map[i].pr_mflags;
637 if ((flags & (MA_BREAK | MA_STACK | MA_PHYS
638 | MA_FETCHOP | MA_NOTCACHED)) != 0) goto irrelevant;
639 if ((flags & (MA_READ | MA_WRITE)) != (MA_READ | MA_WRITE))
641 /* The latter test is empirically useless in very old Irix */
642 /* versions. Other than the */
643 /* main data and stack segments, everything appears to be */
644 /* mapped readable, writable, executable, and shared(!!). */
645 /* This makes no sense to me. - HB */
646 start = (ptr_t)(addr_map[i].pr_vaddr);
647 if (GC_roots_present(start)) goto irrelevant;
648 if (start < heap_end && start >= heap_start)
651 if (GC_is_thread_stack(start)) goto irrelevant;
652 # endif /* MMAP_STACKS */
654 limit = start + addr_map[i].pr_size;
655 /* The following seemed to be necessary for very old versions */
656 /* of Irix, but it has been reported to discard relevant */
657 /* segments under Irix 6.5. */
659 if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) {
660 /* Discard text segments, i.e. 0-offset mappings against */
661 /* executable files which appear to have ELF headers. */
664 # define MAP_IRR_SZ 10
665 static ptr_t map_irr[MAP_IRR_SZ];
666 /* Known irrelevant map entries */
667 static int n_irr = 0;
671 for (i = 0; i < n_irr; i++) {
672 if (map_irr[i] == start) goto irrelevant;
674 arg = (caddr_t)start;
675 obj = ioctl(fd, PIOCOPENM, &arg);
679 if ((buf.st_mode & 0111) != 0) {
680 if (n_irr < MAP_IRR_SZ) {
681 map_irr[n_irr++] = start;
688 GC_add_roots_inner(start, limit, TRUE);
691 /* Dont keep cached descriptor, for now. Some kernels don't like us */
692 /* to keep a /proc file descriptor around during kill -9. */
693 if (close(fd) < 0) ABORT("Couldnt close /proc file");
697 # endif /* USE_PROC || IRIX5 */
699 # if defined(MSWIN32) || defined(MSWINCE)
701 # define WIN32_LEAN_AND_MEAN
703 # include <windows.h>
706 /* We traverse the entire address space and register all segments */
707 /* that could possibly have been written to. */
709 extern GC_bool GC_is_heap_base (ptr_t p);
711 # ifdef GC_WIN32_THREADS
712 extern void GC_get_next_stack(char *start, char **lo, char **hi);
713 void GC_cond_add_roots(char *base, char * limit)
715 char * curr_base = base;
716 char * next_stack_lo;
717 char * next_stack_hi;
719 if (base == limit) return;
721 GC_get_next_stack(curr_base, &next_stack_lo, &next_stack_hi);
722 if (next_stack_lo >= limit) break;
723 GC_add_roots_inner(curr_base, next_stack_lo, TRUE);
724 curr_base = next_stack_hi;
726 if (curr_base < limit) GC_add_roots_inner(curr_base, limit, TRUE);
729 void GC_cond_add_roots(char *base, char * limit)
733 = (char *) ((word)(&dummy) & ~(GC_sysinfo.dwAllocationGranularity-1));
734 if (base == limit) return;
735 if (limit > stack_top && base < GC_stackbottom) {
736 /* Part of the stack; ignore it. */
739 GC_add_roots_inner(base, limit, TRUE);
744 /* Do we need to separately register the main static data segment? */
745 GC_bool GC_register_main_static_data()
750 extern GC_bool GC_no_win32_dlls;
752 GC_bool GC_register_main_static_data()
754 return GC_no_win32_dlls;
758 # define HAVE_REGISTER_MAIN_STATIC_DATA
760 /* The frame buffer testing code is dead in this version. */
761 /* We leave it here temporarily in case the switch to just */
762 /* testing for MEM_IMAGE sections causes un expected */
764 GC_bool GC_warn_fb = TRUE; /* Warn about traced likely */
765 /* graphics memory. */
766 GC_bool GC_disallow_ignore_fb = FALSE;
767 int GC_ignore_fb_mb; /* Ignore mappings bigger than the */
768 /* specified number of MB. */
769 GC_bool GC_ignore_fb = FALSE; /* Enable frame buffer */
772 /* Issue warning if tracing apparent framebuffer. */
773 /* This limits us to one warning, and it's a back door to */
776 /* Should [start, start+len) be treated as a frame buffer */
778 /* Unfortunately, we currently are not quite sure how to tell */
779 /* this automatically, and rely largely on user input. */
780 /* We expect that any mapping with type MEM_MAPPED (which */
781 /* apparently excludes library data sections) can be safely */
782 /* ignored. But we're too completely remove this code in */
784 /* Based on a very limited sample, it appears that: */
785 /* - Frame buffer mappings appear as mappings of large */
786 /* length, usually a bit less than a power of two. */
787 /* - The definition of "a bit less" in the above cannot */
788 /* be made more precise. */
789 /* - Have a starting address at best 64K aligned. */
790 /* - Have type == MEM_MAPPED. */
791 static GC_bool is_frame_buffer(ptr_t start, size_t len, DWORD tp)
793 static GC_bool initialized = FALSE;
794 # define MB (1024*1024)
795 # define DEFAULT_FB_MB 15
798 if (GC_disallow_ignore_fb || tp != MEM_MAPPED) return FALSE;
800 char * ignore_fb_string = GETENV("GC_IGNORE_FB");
802 if (0 != ignore_fb_string) {
803 while (*ignore_fb_string == ' ' || *ignore_fb_string == '\t')
805 if (*ignore_fb_string == '\0') {
806 GC_ignore_fb_mb = DEFAULT_FB_MB;
808 GC_ignore_fb_mb = atoi(ignore_fb_string);
809 if (GC_ignore_fb_mb < MIN_FB_MB) {
810 WARN("Bad GC_IGNORE_FB value. Using %ld\n", DEFAULT_FB_MB);
811 GC_ignore_fb_mb = DEFAULT_FB_MB;
816 GC_ignore_fb_mb = DEFAULT_FB_MB; /* For warning */
820 if (len >= ((size_t)GC_ignore_fb_mb << 20)) {
825 WARN("Possible frame buffer mapping at 0x%lx: \n"
826 "\tConsider setting GC_IGNORE_FB to improve performance.\n",
837 # ifdef DEBUG_VIRTUALQUERY
838 void GC_dump_meminfo(MEMORY_BASIC_INFORMATION *buf)
840 GC_printf4("BaseAddress = %lx, AllocationBase = %lx, RegionSize = %lx(%lu)\n",
841 buf -> BaseAddress, buf -> AllocationBase, buf -> RegionSize,
843 GC_printf4("\tAllocationProtect = %lx, State = %lx, Protect = %lx, "
845 buf -> AllocationProtect, buf -> State, buf -> Protect,
848 # endif /* DEBUG_VIRTUALQUERY */
850 extern GC_bool GC_wnt; /* Is Windows NT derivative. */
851 /* Defined and set in os_dep.c. */
853 void GC_register_dynamic_libraries()
855 MEMORY_BASIC_INFORMATION buf;
860 char * limit, * new_limit;
863 if (GC_no_win32_dlls) return;
865 base = limit = p = GC_sysinfo.lpMinimumApplicationAddress;
866 # if defined(MSWINCE) && !defined(_WIN32_WCE_EMULATION)
867 /* Only the first 32 MB of address space belongs to the current process */
868 while (p < (LPVOID)0x02000000) {
869 result = VirtualQuery(p, &buf, sizeof(buf));
871 /* Page is free; advance to the next possible allocation base */
873 (((DWORD) p + GC_sysinfo.dwAllocationGranularity)
874 & ~(GC_sysinfo.dwAllocationGranularity-1));
877 while (p < GC_sysinfo.lpMaximumApplicationAddress) {
878 result = VirtualQuery(p, &buf, sizeof(buf));
881 if (result != sizeof(buf)) {
882 ABORT("Weird VirtualQuery result");
884 new_limit = (char *)p + buf.RegionSize;
885 protect = buf.Protect;
886 if (buf.State == MEM_COMMIT
887 && (protect == PAGE_EXECUTE_READWRITE
888 || protect == PAGE_READWRITE)
889 && !GC_is_heap_base(buf.AllocationBase)
890 /* This used to check for
891 * !is_frame_buffer(p, buf.RegionSize, buf.Type)
892 * instead of just checking for MEM_IMAGE.
893 * If something breaks, change it back. */
894 /* There is some evidence that we cannot always
895 * ignore MEM_PRIVATE sections under Windows ME
896 * and predecessors. Hence we now also check for
898 && (buf.Type == MEM_IMAGE ||
899 !GC_wnt && buf.Type == MEM_PRIVATE)) {
900 # ifdef DEBUG_VIRTUALQUERY
901 GC_dump_meminfo(&buf);
903 if ((char *)p != limit) {
904 GC_cond_add_roots(base, limit);
910 if (p > (LPVOID)new_limit /* overflow */) break;
911 p = (LPVOID)new_limit;
913 GC_cond_add_roots(base, limit);
916 #endif /* MSWIN32 || MSWINCE */
918 #if defined(ALPHA) && defined(OSF1)
922 void GC_register_dynamic_libraries()
928 ldr_module_t moduleid = LDR_NULL_MODULE;
929 ldr_module_info_t moduleinfo;
930 size_t moduleinfosize = sizeof(moduleinfo);
931 size_t modulereturnsize;
935 ldr_region_info_t regioninfo;
936 size_t regioninfosize = sizeof(regioninfo);
937 size_t regionreturnsize;
939 /* Obtain id of this process */
940 mypid = ldr_my_process();
942 /* For each module */
945 /* Get the next (first) module */
946 status = ldr_next_module(mypid, &moduleid);
948 /* Any more modules? */
949 if (moduleid == LDR_NULL_MODULE)
950 break; /* No more modules */
952 /* Check status AFTER checking moduleid because */
953 /* of a bug in the non-shared ldr_next_module stub */
955 GC_printf1("dynamic_load: status = %ld\n", (long)status);
957 extern char *sys_errlist[];
960 if (errno <= sys_nerr) {
961 GC_printf1("dynamic_load: %s\n", (long)sys_errlist[errno]);
963 GC_printf1("dynamic_load: %d\n", (long)errno);
966 ABORT("ldr_next_module failed");
969 /* Get the module information */
970 status = ldr_inq_module(mypid, moduleid, &moduleinfo,
971 moduleinfosize, &modulereturnsize);
973 ABORT("ldr_inq_module failed");
975 /* is module for the main program (i.e. nonshared portion)? */
976 if (moduleinfo.lmi_flags & LDR_MAIN)
977 continue; /* skip the main module */
980 GC_printf("---Module---\n");
981 GC_printf("Module ID = %16ld\n", moduleinfo.lmi_modid);
982 GC_printf("Count of regions = %16d\n", moduleinfo.lmi_nregion);
983 GC_printf("flags for module = %16lx\n", moduleinfo.lmi_flags);
984 GC_printf("pathname of module = \"%s\"\n", moduleinfo.lmi_name);
987 /* For each region in this module */
988 for (region = 0; region < moduleinfo.lmi_nregion; region++) {
990 /* Get the region information */
991 status = ldr_inq_region(mypid, moduleid, region, ®ioninfo,
992 regioninfosize, ®ionreturnsize);
994 ABORT("ldr_inq_region failed");
996 /* only process writable (data) regions */
997 if (! (regioninfo.lri_prot & LDR_W))
1001 GC_printf("--- Region ---\n");
1002 GC_printf("Region number = %16ld\n",
1003 regioninfo.lri_region_no);
1004 GC_printf("Protection flags = %016x\n", regioninfo.lri_prot);
1005 GC_printf("Virtual address = %16p\n", regioninfo.lri_vaddr);
1006 GC_printf("Mapped address = %16p\n", regioninfo.lri_mapaddr);
1007 GC_printf("Region size = %16ld\n", regioninfo.lri_size);
1008 GC_printf("Region name = \"%s\"\n", regioninfo.lri_name);
1011 /* register region as a garbage collection root */
1012 GC_add_roots_inner (
1013 (char *)regioninfo.lri_mapaddr,
1014 (char *)regioninfo.lri_mapaddr + regioninfo.lri_size,
1028 extern char *sys_errlist[];
1029 extern int sys_nerr;
1031 void GC_register_dynamic_libraries()
1034 int index = 1; /* Ordinal position in shared library search list */
1035 struct shl_descriptor *shl_desc; /* Shared library info, see dl.h */
1037 /* For each dynamic library loaded */
1040 /* Get info about next shared library */
1041 status = shl_get(index, &shl_desc);
1043 /* Check if this is the end of the list or if some error occured */
1045 # ifdef GC_HPUX_THREADS
1046 /* I've seen errno values of 0. The man page is not clear */
1047 /* as to whether errno should get set on a -1 return. */
1050 if (errno == EINVAL) {
1051 break; /* Moved past end of shared library list --> finished */
1053 if (errno <= sys_nerr) {
1054 GC_printf1("dynamic_load: %s\n", (long) sys_errlist[errno]);
1056 GC_printf1("dynamic_load: %d\n", (long) errno);
1058 ABORT("shl_get failed");
1064 GC_printf0("---Shared library---\n");
1065 GC_printf1("\tfilename = \"%s\"\n", shl_desc->filename);
1066 GC_printf1("\tindex = %d\n", index);
1067 GC_printf1("\thandle = %08x\n",
1068 (unsigned long) shl_desc->handle);
1069 GC_printf1("\ttext seg. start = %08x\n", shl_desc->tstart);
1070 GC_printf1("\ttext seg. end = %08x\n", shl_desc->tend);
1071 GC_printf1("\tdata seg. start = %08x\n", shl_desc->dstart);
1072 GC_printf1("\tdata seg. end = %08x\n", shl_desc->dend);
1073 GC_printf1("\tref. count = %lu\n", shl_desc->ref_count);
1076 /* register shared library's data segment as a garbage collection root */
1077 GC_add_roots_inner((char *) shl_desc->dstart,
1078 (char *) shl_desc->dend, TRUE);
1087 #include <sys/ldr.h>
1088 #include <sys/errno.h>
1089 void GC_register_dynamic_libraries()
1094 struct ld_info *ldi;
1096 ldibuf = alloca(ldibuflen = 8192);
1098 while ( (len = loadquery(L_GETINFO,ldibuf,ldibuflen)) < 0) {
1099 if (errno != ENOMEM) {
1100 ABORT("loadquery failed");
1102 ldibuf = alloca(ldibuflen *= 2);
1105 ldi = (struct ld_info *)ldibuf;
1107 len = ldi->ldinfo_next;
1109 ldi->ldinfo_dataorg,
1110 (ptr_t)(unsigned long)ldi->ldinfo_dataorg
1111 + ldi->ldinfo_datasize,
1113 ldi = len ? (struct ld_info *)((char *)ldi + len) : 0;
1120 /* __private_extern__ hack required for pre-3.4 gcc versions. */
1121 #ifndef __private_extern__
1122 # define __private_extern__ extern
1123 # include <mach-o/dyld.h>
1124 # undef __private_extern__
1126 # include <mach-o/dyld.h>
1128 #include <mach-o/getsect.h>
1130 /*#define DARWIN_DEBUG*/
1132 const static struct {
1135 } GC_dyld_sections[] = {
1136 { SEG_DATA, SECT_DATA },
1137 { SEG_DATA, SECT_BSS },
1138 { SEG_DATA, SECT_COMMON }
1142 static const char *GC_dyld_name_for_hdr(struct mach_header *hdr) {
1144 c = _dyld_image_count();
1145 for(i=0;i<c;i++) if(_dyld_get_image_header(i) == hdr)
1146 return _dyld_get_image_name(i);
1151 /* This should never be called by a thread holding the lock */
1152 static void GC_dyld_image_add(struct mach_header* hdr, unsigned long slide) {
1153 unsigned long start,end,i;
1154 const struct section *sec;
1155 if (GC_no_dls) return;
1156 for(i=0;i<sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]);i++) {
1157 sec = getsectbynamefromheader(
1158 hdr,GC_dyld_sections[i].seg,GC_dyld_sections[i].sect);
1159 if(sec == NULL || sec->size == 0) continue;
1160 start = slide + sec->addr;
1161 end = start + sec->size;
1162 # ifdef DARWIN_DEBUG
1163 GC_printf4("Adding section at %p-%p (%lu bytes) from image %s\n",
1164 start,end,sec->size,GC_dyld_name_for_hdr(hdr));
1166 GC_add_roots((char*)start,(char*)end);
1168 # ifdef DARWIN_DEBUG
1169 GC_print_static_roots();
1173 /* This should never be called by a thread holding the lock */
1174 static void GC_dyld_image_remove(struct mach_header* hdr, unsigned long slide) {
1175 unsigned long start,end,i;
1176 const struct section *sec;
1177 for(i=0;i<sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]);i++) {
1178 sec = getsectbynamefromheader(
1179 hdr,GC_dyld_sections[i].seg,GC_dyld_sections[i].sect);
1180 if(sec == NULL || sec->size == 0) continue;
1181 start = slide + sec->addr;
1182 end = start + sec->size;
1183 # ifdef DARWIN_DEBUG
1184 GC_printf4("Removing section at %p-%p (%lu bytes) from image %s\n",
1185 start,end,sec->size,GC_dyld_name_for_hdr(hdr));
1187 GC_remove_roots((char*)start,(char*)end);
1189 # ifdef DARWIN_DEBUG
1190 GC_print_static_roots();
1194 void GC_register_dynamic_libraries() {
1195 /* Currently does nothing. The callbacks are setup by GC_init_dyld()
1196 The dyld library takes it from there. */
1199 /* The _dyld_* functions have an internal lock so no _dyld functions
1200 can be called while the world is stopped without the risk of a deadlock.
1201 Because of this we MUST setup callbacks BEFORE we ever stop the world.
1202 This should be called BEFORE any thread in created and WITHOUT the
1203 allocation lock held. */
1205 void GC_init_dyld() {
1206 static GC_bool initialized = FALSE;
1207 char *bind_fully_env = NULL;
1209 if(initialized) return;
1211 # ifdef DARWIN_DEBUG
1212 GC_printf0("Registering dyld callbacks...\n");
1215 /* Apple's Documentation:
1216 When you call _dyld_register_func_for_add_image, the dynamic linker runtime
1217 calls the specified callback (func) once for each of the images that is
1218 currently loaded into the program. When a new image is added to the program,
1219 your callback is called again with the mach_header for the new image, and the
1220 virtual memory slide amount of the new image.
1222 This WILL properly register already linked libraries and libraries
1223 linked in the future
1226 _dyld_register_func_for_add_image(GC_dyld_image_add);
1227 _dyld_register_func_for_remove_image(GC_dyld_image_remove);
1229 /* Set this early to avoid reentrancy issues. */
1232 bind_fully_env = getenv("DYLD_BIND_AT_LAUNCH");
1234 if (bind_fully_env == NULL) {
1235 # ifdef DARWIN_DEBUG
1236 GC_printf0("Forcing full bind of GC code...\n");
1239 if(!_dyld_bind_fully_image_containing_address((unsigned long*)GC_malloc))
1240 GC_abort("_dyld_bind_fully_image_containing_address failed");
1245 #define HAVE_REGISTER_MAIN_STATIC_DATA
1246 GC_bool GC_register_main_static_data()
1248 /* Already done through dyld callbacks */
1254 #else /* !DYNAMIC_LOADING */
1258 # include "il/PCR_IL.h"
1259 # include "th/PCR_ThCtl.h"
1260 # include "mm/PCR_MM.h"
1262 void GC_register_dynamic_libraries()
1264 /* Add new static data areas of dynamically loaded modules. */
1266 PCR_IL_LoadedFile * p = PCR_IL_GetLastLoadedFile();
1267 PCR_IL_LoadedSegment * q;
1269 /* Skip uncommited files */
1270 while (p != NIL && !(p -> lf_commitPoint)) {
1271 /* The loading of this file has not yet been committed */
1272 /* Hence its description could be inconsistent. */
1273 /* Furthermore, it hasn't yet been run. Hence its data */
1274 /* segments can't possibly reference heap allocated */
1278 for (; p != NIL; p = p -> lf_prev) {
1279 for (q = p -> lf_ls; q != NIL; q = q -> ls_next) {
1280 if ((q -> ls_flags & PCR_IL_SegFlags_Traced_MASK)
1281 == PCR_IL_SegFlags_Traced_on) {
1283 ((char *)(q -> ls_addr),
1284 (char *)(q -> ls_addr) + q -> ls_bytes,
1295 void GC_register_dynamic_libraries(){}
1297 int GC_no_dynamic_loading;
1301 #endif /* !DYNAMIC_LOADING */
1303 #ifndef HAVE_REGISTER_MAIN_STATIC_DATA
1305 /* Do we need to separately register the main static data segment? */
1306 GC_bool GC_register_main_static_data()
1310 #endif /* HAVE_REGISTER_MAIN_STATIC_DATA */