Annotation of OpenXM_contrib2/asir2000/gc/dyn_load.c, Revision 1.7
1.1 noro 1: /*
2: * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
3: * Copyright (c) 1997 by Silicon Graphics. All rights reserved.
4: *
5: * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
6: * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
7: *
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.
13: *
14: * Original author: Bill Janssen
15: * Heavily modified by Hans Boehm and others
16: */
17:
18: /*
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 ...
25: *
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.
28: */
1.6 noro 29: #if defined(__linux__) && !defined(_GNU_SOURCE)
30: /* Can't test LINUX, since this must be define before other includes */
31: # define _GNU_SOURCE
32: #endif
1.4 noro 33: #if !defined(MACOS) && !defined(_WIN32_WCE)
1.1 noro 34: # include <sys/types.h>
35: #endif
1.4 noro 36: #include "private/gc_priv.h"
1.1 noro 37:
1.6 noro 38: /* BTL: avoid circular redefinition of dlopen if GC_SOLARIS_THREADS defined */
39: # if (defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS)) \
40: && defined(dlopen) && !defined(GC_USE_LD_WRAP)
1.1 noro 41: /* To support threads in Solaris, gc.h interposes on dlopen by */
42: /* defining "dlopen" to be "GC_dlopen", which is implemented below. */
43: /* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the */
44: /* real system dlopen() in their implementation. We first remove */
45: /* gc.h's dlopen definition and restore it later, after GC_dlopen(). */
46: # undef dlopen
47: # define GC_must_restore_redefined_dlopen
48: # else
49: # undef GC_must_restore_redefined_dlopen
50: # endif
51:
1.4 noro 52: #if (defined(DYNAMIC_LOADING) || defined(MSWIN32) || defined(MSWINCE)) \
53: && !defined(PCR)
1.1 noro 54: #if !defined(SUNOS4) && !defined(SUNOS5DL) && !defined(IRIX5) && \
1.4 noro 55: !defined(MSWIN32) && !defined(MSWINCE) && \
56: !(defined(ALPHA) && defined(OSF1)) && \
1.2 noro 57: !defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \
1.6 noro 58: !defined(RS6000) && !defined(SCO_ELF) && !defined(DGUX) && \
59: !(defined(FREEBSD) && defined(__ELF__)) && \
1.7 ! noro 60: !(defined(NETBSD) && defined(__ELF__)) && !defined(HURD) && \
! 61: !defined(DARWIN)
1.1 noro 62: --> We only know how to find data segments of dynamic libraries for the
63: --> above. Additional SVR4 variants might not be too
64: --> hard to add.
65: #endif
66:
67: #include <stdio.h>
68: #ifdef SUNOS5DL
69: # include <sys/elf.h>
70: # include <dlfcn.h>
71: # include <link.h>
72: #endif
73: #ifdef SUNOS4
74: # include <dlfcn.h>
75: # include <link.h>
76: # include <a.out.h>
77: /* struct link_map field overrides */
78: # define l_next lm_next
79: # define l_addr lm_addr
80: # define l_name lm_name
81: #endif
82:
1.6 noro 83: #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \
84: (defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \
85: (defined(NETBSD) && defined(__ELF__)) || defined(HURD)
86: # include <stddef.h>
87: # include <elf.h>
88: # include <link.h>
89: #endif
90:
91: /* Newer versions of GNU/Linux define this macro. We
92: * define it similarly for any ELF systems that don't. */
93: # ifndef ElfW
94: # if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32
95: # define ElfW(type) Elf32_##type
96: # else
97: # define ElfW(type) Elf64_##type
98: # endif
99: # endif
1.1 noro 100:
101: #if defined(SUNOS5DL) && !defined(USE_PROC_FOR_LIBRARIES)
102:
103: #ifdef LINT
104: Elf32_Dyn _DYNAMIC;
105: #endif
106:
107: static struct link_map *
108: GC_FirstDLOpenedLinkMap()
109: {
1.6 noro 110: extern ElfW(Dyn) _DYNAMIC;
111: ElfW(Dyn) *dp;
1.1 noro 112: struct r_debug *r;
113: static struct link_map * cachedResult = 0;
1.6 noro 114: static ElfW(Dyn) *dynStructureAddr = 0;
1.1 noro 115: /* BTL: added to avoid Solaris 5.3 ld.so _DYNAMIC bug */
116:
117: # ifdef SUNOS53_SHARED_LIB
118: /* BTL: Avoid the Solaris 5.3 bug that _DYNAMIC isn't being set */
119: /* up properly in dynamically linked .so's. This means we have */
120: /* to use its value in the set of original object files loaded */
121: /* at program startup. */
122: if( dynStructureAddr == 0 ) {
123: void* startupSyms = dlopen(0, RTLD_LAZY);
1.6 noro 124: dynStructureAddr = (ElfW(Dyn)*)dlsym(startupSyms, "_DYNAMIC");
1.1 noro 125: }
126: # else
127: dynStructureAddr = &_DYNAMIC;
128: # endif
129:
130: if( dynStructureAddr == 0) {
131: return(0);
132: }
133: if( cachedResult == 0 ) {
134: int tag;
1.6 noro 135: for( dp = ((ElfW(Dyn) *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) {
1.1 noro 136: if( tag == DT_DEBUG ) {
137: struct link_map *lm
138: = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
139: if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
140: break;
141: }
142: }
143: }
144: return cachedResult;
145: }
146:
147: #endif /* SUNOS5DL ... */
148:
1.6 noro 149: /* BTL: added to fix circular dlopen definition if GC_SOLARIS_THREADS defined */
1.4 noro 150: # if defined(GC_must_restore_redefined_dlopen)
151: # define dlopen GC_dlopen
152: # endif
153:
1.1 noro 154: #if defined(SUNOS4) && !defined(USE_PROC_FOR_LIBRARIES)
155:
156: #ifdef LINT
157: struct link_dynamic _DYNAMIC;
158: #endif
159:
160: static struct link_map *
161: GC_FirstDLOpenedLinkMap()
162: {
163: extern struct link_dynamic _DYNAMIC;
164:
165: if( &_DYNAMIC == 0) {
166: return(0);
167: }
168: return(_DYNAMIC.ld_un.ld_1->ld_loaded);
169: }
170:
171: /* Return the address of the ld.so allocated common symbol */
172: /* with the least address, or 0 if none. */
173: static ptr_t GC_first_common()
174: {
175: ptr_t result = 0;
176: extern struct link_dynamic _DYNAMIC;
177: struct rtc_symb * curr_symbol;
178:
179: if( &_DYNAMIC == 0) {
180: return(0);
181: }
182: curr_symbol = _DYNAMIC.ldd -> ldd_cp;
183: for (; curr_symbol != 0; curr_symbol = curr_symbol -> rtc_next) {
184: if (result == 0
185: || (ptr_t)(curr_symbol -> rtc_sp -> n_value) < result) {
186: result = (ptr_t)(curr_symbol -> rtc_sp -> n_value);
187: }
188: }
189: return(result);
190: }
191:
192: #endif /* SUNOS4 ... */
193:
1.3 noro 194: # if defined(SUNOS4) || defined(SUNOS5DL)
195: /* Add dynamic library data sections to the root set. */
1.6 noro 196: # if !defined(PCR) && !defined(GC_SOLARIS_THREADS) && defined(THREADS)
1.3 noro 197: # ifndef SRC_M3
198: --> fix mutual exclusion with dlopen
199: # endif /* We assume M3 programs don't call dlopen for now */
200: # endif
201:
1.1 noro 202: # ifndef USE_PROC_FOR_LIBRARIES
203: void GC_register_dynamic_libraries()
204: {
205: struct link_map *lm = GC_FirstDLOpenedLinkMap();
206:
207:
208: for (lm = GC_FirstDLOpenedLinkMap();
209: lm != (struct link_map *) 0; lm = lm->l_next)
210: {
211: # ifdef SUNOS4
212: struct exec *e;
213:
214: e = (struct exec *) lm->lm_addr;
215: GC_add_roots_inner(
216: ((char *) (N_DATOFF(*e) + lm->lm_addr)),
217: ((char *) (N_BSSADDR(*e) + e->a_bss + lm->lm_addr)),
218: TRUE);
219: # endif
220: # ifdef SUNOS5DL
1.6 noro 221: ElfW(Ehdr) * e;
222: ElfW(Phdr) * p;
1.1 noro 223: unsigned long offset;
224: char * start;
225: register int i;
226:
1.6 noro 227: e = (ElfW(Ehdr) *) lm->l_addr;
228: p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
1.1 noro 229: offset = ((unsigned long)(lm->l_addr));
230: for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
231: switch( p->p_type ) {
232: case PT_LOAD:
233: {
234: if( !(p->p_flags & PF_W) ) break;
235: start = ((char *)(p->p_vaddr)) + offset;
236: GC_add_roots_inner(
237: start,
238: start + p->p_memsz,
239: TRUE
240: );
241: }
242: break;
243: default:
244: break;
245: }
246: }
247: # endif
248: }
249: # ifdef SUNOS4
250: {
251: static ptr_t common_start = 0;
252: ptr_t common_end;
253: extern ptr_t GC_find_limit();
254:
255: if (common_start == 0) common_start = GC_first_common();
256: if (common_start != 0) {
257: common_end = GC_find_limit(common_start, TRUE);
258: GC_add_roots_inner((char *)common_start, (char *)common_end, TRUE);
259: }
260: }
261: # endif
262: }
263:
264: # endif /* !USE_PROC ... */
265: # endif /* SUNOS */
266:
1.4 noro 267: #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \
1.6 noro 268: (defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \
269: (defined(NETBSD) && defined(__ELF__)) || defined(HURD)
1.4 noro 270:
271:
272: #ifdef USE_PROC_FOR_LIBRARIES
273:
274: #include <string.h>
275:
276: #include <sys/stat.h>
277: #include <fcntl.h>
278: #include <unistd.h>
279:
280: #define MAPS_BUF_SIZE (32*1024)
281:
282: extern ssize_t GC_repeat_read(int fd, char *buf, size_t count);
283: /* Repeatedly read until buffer is filled, or EOF is encountered */
284: /* Defined in os_dep.c. */
285:
1.7 ! noro 286: char *GC_parse_map_entry(char *buf_ptr, word *start, word *end,
! 287: char *prot_buf, unsigned int *maj_dev);
! 288: word GC_apply_to_maps(word (*fn)(char *));
! 289: /* From os_dep.c */
1.4 noro 290:
1.7 ! noro 291: word GC_register_map_entries(char *maps)
1.4 noro 292: {
293: char prot_buf[5];
1.7 ! noro 294: char *buf_ptr = maps;
1.4 noro 295: int count;
296: word start, end;
1.7 ! noro 297: unsigned int maj_dev;
1.4 noro 298: word least_ha, greatest_ha;
299: unsigned i;
300: word datastart = (word)(DATASTART);
301:
1.7 ! noro 302: /* Compute heap bounds. FIXME: Should be done by add_to_heap? */
1.4 noro 303: least_ha = (word)(-1);
304: greatest_ha = 0;
305: for (i = 0; i < GC_n_heap_sects; ++i) {
306: word sect_start = (word)GC_heap_sects[i].hs_start;
307: word sect_end = sect_start + GC_heap_sects[i].hs_bytes;
308: if (sect_start < least_ha) least_ha = sect_start;
309: if (sect_end > greatest_ha) greatest_ha = sect_end;
310: }
311: if (greatest_ha < (word)GC_scratch_last_end_ptr)
312: greatest_ha = (word)GC_scratch_last_end_ptr;
1.7 ! noro 313:
1.4 noro 314: for (;;) {
1.7 ! noro 315: buf_ptr = GC_parse_map_entry(buf_ptr, &start, &end, prot_buf, &maj_dev);
! 316: if (buf_ptr == NULL) return 1;
1.4 noro 317: if (prot_buf[1] == 'w') {
318: /* This is a writable mapping. Add it to */
319: /* the root set unless it is already otherwise */
320: /* accounted for. */
321: if (start <= (word)GC_stackbottom && end >= (word)GC_stackbottom) {
322: /* Stack mapping; discard */
323: continue;
324: }
325: # ifdef THREADS
326: if (GC_segment_is_thread_stack(start, end)) continue;
327: # endif
1.7 ! noro 328: /* We no longer exclude the main data segment. */
1.4 noro 329: if (start < least_ha && end > least_ha) {
330: end = least_ha;
331: }
332: if (start < greatest_ha && end > greatest_ha) {
333: start = greatest_ha;
334: }
335: if (start >= least_ha && end <= greatest_ha) continue;
336: GC_add_roots_inner((char *)start, (char *)end, TRUE);
337: }
1.7 ! noro 338: }
! 339: return 1;
1.4 noro 340: }
341:
1.7 ! noro 342: void GC_register_dynamic_libraries()
! 343: {
! 344: if (!GC_apply_to_maps(GC_register_map_entries))
! 345: ABORT("Failed to read /proc for library registration.");
! 346: }
1.4 noro 347:
1.7 ! noro 348: /* We now take care of the main data segment ourselves: */
! 349: GC_bool GC_register_main_static_data()
1.4 noro 350: {
1.7 ! noro 351: return FALSE;
1.4 noro 352: }
1.7 ! noro 353:
! 354: # define HAVE_REGISTER_MAIN_STATIC_DATA
1.4 noro 355:
1.6 noro 356: #endif /* USE_PROC_FOR_LIBRARIES */
357:
358: #if !defined(USE_PROC_FOR_LIBRARIES)
359: /* The following is the preferred way to walk dynamic libraries */
360: /* For glibc 2.2.4+. Unfortunately, it doesn't work for older */
361: /* versions. Thanks to Jakub Jelinek for most of the code. */
362:
363: # if defined(LINUX) /* Are others OK here, too? */ \
364: && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
365: || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
366:
367: /* We have the header files for a glibc that includes dl_iterate_phdr. */
368: /* It may still not be available in the library on the target system. */
369: /* Thus we also treat it as a weak symbol. */
370: #define HAVE_DL_ITERATE_PHDR
371:
372: static int GC_register_dynlib_callback(info, size, ptr)
373: struct dl_phdr_info * info;
374: size_t size;
375: void * ptr;
376: {
377: const ElfW(Phdr) * p;
378: char * start;
379: register int i;
380:
381: /* Make sure struct dl_phdr_info is at least as big as we need. */
382: if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
383: + sizeof (info->dlpi_phnum))
384: return -1;
385:
386: p = info->dlpi_phdr;
387: for( i = 0; i < (int)(info->dlpi_phnum); ((i++),(p++)) ) {
388: switch( p->p_type ) {
389: case PT_LOAD:
390: {
391: if( !(p->p_flags & PF_W) ) break;
392: start = ((char *)(p->p_vaddr)) + info->dlpi_addr;
393: GC_add_roots_inner(start, start + p->p_memsz, TRUE);
394: }
395: break;
396: default:
397: break;
398: }
399: }
400:
1.7 ! noro 401: * (int *)ptr = 1; /* Signal that we were called */
1.6 noro 402: return 0;
403: }
404:
405: /* Return TRUE if we succeed, FALSE if dl_iterate_phdr wasn't there. */
406:
407: #pragma weak dl_iterate_phdr
408:
409: GC_bool GC_register_dynamic_libraries_dl_iterate_phdr()
410: {
1.7 ! noro 411: if (dl_iterate_phdr) {
! 412: int did_something = 0;
! 413: dl_iterate_phdr(GC_register_dynlib_callback, &did_something);
! 414: if (!did_something) {
! 415: /* dl_iterate_phdr may forget the static data segment in */
! 416: /* statically linked executables. */
! 417: GC_add_roots_inner(DATASTART, (char *)(DATAEND), TRUE);
! 418: # if defined(DATASTART2)
! 419: GC_add_roots_inner(DATASTART2, (char *)(DATAEND2), TRUE);
! 420: # endif
! 421: }
1.6 noro 422:
423: return TRUE;
424: } else {
425: return FALSE;
426: }
427: }
428:
1.7 ! noro 429: /* Do we need to separately register the main static data segment? */
! 430: GC_bool GC_register_main_static_data()
! 431: {
! 432: return (dl_iterate_phdr == 0);
! 433: }
! 434:
! 435: #define HAVE_REGISTER_MAIN_STATIC_DATA
! 436:
1.6 noro 437: # else /* !LINUX || version(glibc) < 2.2.4 */
1.1 noro 438:
439: /* Dynamic loading code for Linux running ELF. Somewhat tested on
440: * Linux/x86, untested but hopefully should work on Linux/Alpha.
441: * This code was derived from the Solaris/ELF support. Thanks to
442: * whatever kind soul wrote that. - Patrick Bridges */
443:
1.6 noro 444: /* This doesn't necessarily work in all cases, e.g. with preloaded
445: * dynamic libraries. */
446:
1.4 noro 447: #if defined(NETBSD)
448: # include <sys/exec_elf.h>
449: #else
450: # include <elf.h>
451: #endif
1.1 noro 452: #include <link.h>
453:
1.6 noro 454: # endif
455:
456: #ifdef __GNUC__
457: # pragma weak _DYNAMIC
458: #endif
459: extern ElfW(Dyn) _DYNAMIC[];
1.1 noro 460:
461: static struct link_map *
462: GC_FirstDLOpenedLinkMap()
463: {
464: ElfW(Dyn) *dp;
465: struct r_debug *r;
466: static struct link_map *cachedResult = 0;
467:
468: if( _DYNAMIC == 0) {
469: return(0);
470: }
471: if( cachedResult == 0 ) {
472: int tag;
473: for( dp = _DYNAMIC; (tag = dp->d_tag) != 0; dp++ ) {
474: if( tag == DT_DEBUG ) {
475: struct link_map *lm
476: = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
477: if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
478: break;
479: }
480: }
481: }
482: return cachedResult;
483: }
484:
485:
486: void GC_register_dynamic_libraries()
487: {
1.6 noro 488: struct link_map *lm;
1.1 noro 489:
490:
1.6 noro 491: # ifdef HAVE_DL_ITERATE_PHDR
492: if (GC_register_dynamic_libraries_dl_iterate_phdr()) {
493: return;
494: }
495: # endif
496: lm = GC_FirstDLOpenedLinkMap();
1.1 noro 497: for (lm = GC_FirstDLOpenedLinkMap();
498: lm != (struct link_map *) 0; lm = lm->l_next)
499: {
500: ElfW(Ehdr) * e;
501: ElfW(Phdr) * p;
502: unsigned long offset;
503: char * start;
504: register int i;
505:
506: e = (ElfW(Ehdr) *) lm->l_addr;
507: p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
508: offset = ((unsigned long)(lm->l_addr));
509: for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
510: switch( p->p_type ) {
511: case PT_LOAD:
512: {
513: if( !(p->p_flags & PF_W) ) break;
514: start = ((char *)(p->p_vaddr)) + offset;
515: GC_add_roots_inner(start, start + p->p_memsz, TRUE);
516: }
517: break;
518: default:
519: break;
520: }
521: }
522: }
523: }
524:
1.4 noro 525: #endif /* !USE_PROC_FOR_LIBRARIES */
526:
527: #endif /* LINUX */
1.1 noro 528:
1.4 noro 529: #if defined(IRIX5) || (defined(USE_PROC_FOR_LIBRARIES) && !defined(LINUX))
1.1 noro 530:
531: #include <sys/procfs.h>
532: #include <sys/stat.h>
533: #include <fcntl.h>
534: #include <elf.h>
535: #include <errno.h>
1.6 noro 536: #include <signal.h> /* Only for the following test. */
537: #ifndef _sigargs
538: # define IRIX6
539: #endif
1.1 noro 540:
541: extern void * GC_roots_present();
542: /* The type is a lie, since the real type doesn't make sense here, */
543: /* and we only test for NULL. */
544:
545:
546: /* We use /proc to track down all parts of the address space that are */
547: /* mapped by the process, and throw out regions we know we shouldn't */
548: /* worry about. This may also work under other SVR4 variants. */
549: void GC_register_dynamic_libraries()
550: {
551: static int fd = -1;
552: char buf[30];
553: static prmap_t * addr_map = 0;
554: static int current_sz = 0; /* Number of records currently in addr_map */
555: static int needed_sz; /* Required size of addr_map */
556: register int i;
557: register long flags;
558: register ptr_t start;
559: register ptr_t limit;
560: ptr_t heap_start = (ptr_t)HEAP_START;
561: ptr_t heap_end = heap_start;
562:
563: # ifdef SUNOS5DL
564: # define MA_PHYS 0
565: # endif /* SUNOS5DL */
566:
567: if (fd < 0) {
568: sprintf(buf, "/proc/%d", getpid());
569: /* The above generates a lint complaint, since pid_t varies. */
570: /* It's unclear how to improve this. */
571: fd = open(buf, O_RDONLY);
572: if (fd < 0) {
573: ABORT("/proc open failed");
574: }
575: }
576: if (ioctl(fd, PIOCNMAP, &needed_sz) < 0) {
577: GC_err_printf2("fd = %d, errno = %d\n", fd, errno);
578: ABORT("/proc PIOCNMAP ioctl failed");
579: }
580: if (needed_sz >= current_sz) {
581: current_sz = needed_sz * 2 + 1;
582: /* Expansion, plus room for 0 record */
583: addr_map = (prmap_t *)GC_scratch_alloc((word)
584: (current_sz * sizeof(prmap_t)));
585: }
586: if (ioctl(fd, PIOCMAP, addr_map) < 0) {
587: GC_err_printf4("fd = %d, errno = %d, needed_sz = %d, addr_map = 0x%X\n",
588: fd, errno, needed_sz, addr_map);
589: ABORT("/proc PIOCMAP ioctl failed");
590: };
591: if (GC_n_heap_sects > 0) {
592: heap_end = GC_heap_sects[GC_n_heap_sects-1].hs_start
593: + GC_heap_sects[GC_n_heap_sects-1].hs_bytes;
594: if (heap_end < GC_scratch_last_end_ptr) heap_end = GC_scratch_last_end_ptr;
595: }
596: for (i = 0; i < needed_sz; i++) {
597: flags = addr_map[i].pr_mflags;
598: if ((flags & (MA_BREAK | MA_STACK | MA_PHYS)) != 0) goto irrelevant;
599: if ((flags & (MA_READ | MA_WRITE)) != (MA_READ | MA_WRITE))
600: goto irrelevant;
1.6 noro 601: /* The latter test is empirically useless in very old Irix */
602: /* versions. Other than the */
1.1 noro 603: /* main data and stack segments, everything appears to be */
604: /* mapped readable, writable, executable, and shared(!!). */
605: /* This makes no sense to me. - HB */
606: start = (ptr_t)(addr_map[i].pr_vaddr);
607: if (GC_roots_present(start)) goto irrelevant;
608: if (start < heap_end && start >= heap_start)
609: goto irrelevant;
610: # ifdef MMAP_STACKS
611: if (GC_is_thread_stack(start)) goto irrelevant;
612: # endif /* MMAP_STACKS */
613:
614: limit = start + addr_map[i].pr_size;
1.6 noro 615: /* The following seemed to be necessary for very old versions */
616: /* of Irix, but it has been reported to discard relevant */
617: /* segments under Irix 6.5. */
618: # ifndef IRIX6
619: if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) {
1.1 noro 620: /* Discard text segments, i.e. 0-offset mappings against */
621: /* executable files which appear to have ELF headers. */
622: caddr_t arg;
623: int obj;
624: # define MAP_IRR_SZ 10
625: static ptr_t map_irr[MAP_IRR_SZ];
626: /* Known irrelevant map entries */
627: static int n_irr = 0;
628: struct stat buf;
629: register int i;
630:
631: for (i = 0; i < n_irr; i++) {
632: if (map_irr[i] == start) goto irrelevant;
633: }
634: arg = (caddr_t)start;
635: obj = ioctl(fd, PIOCOPENM, &arg);
636: if (obj >= 0) {
637: fstat(obj, &buf);
638: close(obj);
639: if ((buf.st_mode & 0111) != 0) {
640: if (n_irr < MAP_IRR_SZ) {
641: map_irr[n_irr++] = start;
642: }
643: goto irrelevant;
644: }
645: }
1.6 noro 646: }
647: # endif /* !IRIX6 */
1.1 noro 648: GC_add_roots_inner(start, limit, TRUE);
649: irrelevant: ;
650: }
651: /* Dont keep cached descriptor, for now. Some kernels don't like us */
652: /* to keep a /proc file descriptor around during kill -9. */
653: if (close(fd) < 0) ABORT("Couldnt close /proc file");
654: fd = -1;
655: }
656:
657: # endif /* USE_PROC || IRIX5 */
658:
1.4 noro 659: # if defined(MSWIN32) || defined(MSWINCE)
1.1 noro 660:
661: # define WIN32_LEAN_AND_MEAN
662: # define NOSERVICE
663: # include <windows.h>
664: # include <stdlib.h>
665:
666: /* We traverse the entire address space and register all segments */
667: /* that could possibly have been written to. */
668:
669: extern GC_bool GC_is_heap_base (ptr_t p);
670:
1.6 noro 671: # ifdef GC_WIN32_THREADS
1.1 noro 672: extern void GC_get_next_stack(char *start, char **lo, char **hi);
1.4 noro 673: void GC_cond_add_roots(char *base, char * limit)
674: {
675: char * curr_base = base;
676: char * next_stack_lo;
677: char * next_stack_hi;
678:
679: if (base == limit) return;
680: for(;;) {
681: GC_get_next_stack(curr_base, &next_stack_lo, &next_stack_hi);
682: if (next_stack_lo >= limit) break;
683: GC_add_roots_inner(curr_base, next_stack_lo, TRUE);
684: curr_base = next_stack_hi;
685: }
686: if (curr_base < limit) GC_add_roots_inner(curr_base, limit, TRUE);
687: }
688: # else
689: void GC_cond_add_roots(char *base, char * limit)
1.1 noro 690: {
1.4 noro 691: char dummy;
692: char * stack_top
693: = (char *) ((word)(&dummy) & ~(GC_sysinfo.dwAllocationGranularity-1));
694: if (base == limit) return;
695: if (limit > stack_top && base < GC_stackbottom) {
696: /* Part of the stack; ignore it. */
697: return;
698: }
699: GC_add_roots_inner(base, limit, TRUE);
1.1 noro 700: }
1.4 noro 701: # endif
702:
1.7 ! noro 703: # ifdef MSWINCE
! 704: /* Do we need to separately register the main static data segment? */
! 705: GC_bool GC_register_main_static_data()
! 706: {
! 707: return FALSE;
! 708: }
! 709: # else /* win32 */
1.6 noro 710: extern GC_bool GC_no_win32_dlls;
1.7 ! noro 711:
! 712: GC_bool GC_register_main_static_data()
! 713: {
! 714: return GC_no_win32_dlls;
! 715: }
! 716: # endif /* win32 */
1.1 noro 717:
1.7 ! noro 718: # define HAVE_REGISTER_MAIN_STATIC_DATA
! 719:
1.1 noro 720: void GC_register_dynamic_libraries()
721: {
722: MEMORY_BASIC_INFORMATION buf;
723: DWORD result;
724: DWORD protect;
725: LPVOID p;
726: char * base;
727: char * limit, * new_limit;
1.4 noro 728:
729: # ifdef MSWIN32
1.6 noro 730: if (GC_no_win32_dlls) return;
1.4 noro 731: # endif
732: base = limit = p = GC_sysinfo.lpMinimumApplicationAddress;
733: # if defined(MSWINCE) && !defined(_WIN32_WCE_EMULATION)
734: /* Only the first 32 MB of address space belongs to the current process */
735: while (p < (LPVOID)0x02000000) {
736: result = VirtualQuery(p, &buf, sizeof(buf));
737: if (result == 0) {
738: /* Page is free; advance to the next possible allocation base */
739: new_limit = (char *)
740: (((DWORD) p + GC_sysinfo.dwAllocationGranularity)
741: & ~(GC_sysinfo.dwAllocationGranularity-1));
742: } else
743: # else
744: while (p < GC_sysinfo.lpMaximumApplicationAddress) {
1.1 noro 745: result = VirtualQuery(p, &buf, sizeof(buf));
1.4 noro 746: # endif
747: {
748: if (result != sizeof(buf)) {
749: ABORT("Weird VirtualQuery result");
750: }
751: new_limit = (char *)p + buf.RegionSize;
752: protect = buf.Protect;
753: if (buf.State == MEM_COMMIT
754: && (protect == PAGE_EXECUTE_READWRITE
755: || protect == PAGE_READWRITE)
756: && !GC_is_heap_base(buf.AllocationBase)) {
757: if ((char *)p != limit) {
758: GC_cond_add_roots(base, limit);
759: base = p;
760: }
761: limit = new_limit;
762: }
763: }
1.1 noro 764: if (p > (LPVOID)new_limit /* overflow */) break;
765: p = (LPVOID)new_limit;
766: }
767: GC_cond_add_roots(base, limit);
768: }
769:
1.4 noro 770: #endif /* MSWIN32 || MSWINCE */
771:
1.1 noro 772: #if defined(ALPHA) && defined(OSF1)
773:
774: #include <loader.h>
775:
776: void GC_register_dynamic_libraries()
777: {
778: int status;
779: ldr_process_t mypid;
780:
781: /* module */
782: ldr_module_t moduleid = LDR_NULL_MODULE;
783: ldr_module_info_t moduleinfo;
784: size_t moduleinfosize = sizeof(moduleinfo);
785: size_t modulereturnsize;
786:
787: /* region */
788: ldr_region_t region;
789: ldr_region_info_t regioninfo;
790: size_t regioninfosize = sizeof(regioninfo);
791: size_t regionreturnsize;
792:
793: /* Obtain id of this process */
794: mypid = ldr_my_process();
795:
796: /* For each module */
797: while (TRUE) {
798:
799: /* Get the next (first) module */
800: status = ldr_next_module(mypid, &moduleid);
801:
802: /* Any more modules? */
803: if (moduleid == LDR_NULL_MODULE)
804: break; /* No more modules */
805:
806: /* Check status AFTER checking moduleid because */
807: /* of a bug in the non-shared ldr_next_module stub */
808: if (status != 0 ) {
809: GC_printf1("dynamic_load: status = %ld\n", (long)status);
810: {
811: extern char *sys_errlist[];
812: extern int sys_nerr;
813: extern int errno;
814: if (errno <= sys_nerr) {
815: GC_printf1("dynamic_load: %s\n", (long)sys_errlist[errno]);
816: } else {
817: GC_printf1("dynamic_load: %d\n", (long)errno);
818: }
819: }
820: ABORT("ldr_next_module failed");
821: }
822:
823: /* Get the module information */
824: status = ldr_inq_module(mypid, moduleid, &moduleinfo,
825: moduleinfosize, &modulereturnsize);
826: if (status != 0 )
827: ABORT("ldr_inq_module failed");
828:
829: /* is module for the main program (i.e. nonshared portion)? */
830: if (moduleinfo.lmi_flags & LDR_MAIN)
831: continue; /* skip the main module */
832:
833: # ifdef VERBOSE
834: GC_printf("---Module---\n");
835: GC_printf("Module ID = %16ld\n", moduleinfo.lmi_modid);
836: GC_printf("Count of regions = %16d\n", moduleinfo.lmi_nregion);
837: GC_printf("flags for module = %16lx\n", moduleinfo.lmi_flags);
838: GC_printf("pathname of module = \"%s\"\n", moduleinfo.lmi_name);
839: # endif
840:
841: /* For each region in this module */
842: for (region = 0; region < moduleinfo.lmi_nregion; region++) {
843:
844: /* Get the region information */
845: status = ldr_inq_region(mypid, moduleid, region, ®ioninfo,
846: regioninfosize, ®ionreturnsize);
847: if (status != 0 )
848: ABORT("ldr_inq_region failed");
849:
850: /* only process writable (data) regions */
851: if (! (regioninfo.lri_prot & LDR_W))
852: continue;
853:
854: # ifdef VERBOSE
855: GC_printf("--- Region ---\n");
856: GC_printf("Region number = %16ld\n",
857: regioninfo.lri_region_no);
858: GC_printf("Protection flags = %016x\n", regioninfo.lri_prot);
859: GC_printf("Virtual address = %16p\n", regioninfo.lri_vaddr);
860: GC_printf("Mapped address = %16p\n", regioninfo.lri_mapaddr);
861: GC_printf("Region size = %16ld\n", regioninfo.lri_size);
862: GC_printf("Region name = \"%s\"\n", regioninfo.lri_name);
863: # endif
864:
865: /* register region as a garbage collection root */
866: GC_add_roots_inner (
867: (char *)regioninfo.lri_mapaddr,
868: (char *)regioninfo.lri_mapaddr + regioninfo.lri_size,
869: TRUE);
870:
871: }
872: }
873: }
874: #endif
875:
1.2 noro 876: #if defined(HPUX)
1.1 noro 877:
878: #include <errno.h>
879: #include <dl.h>
880:
881: extern int errno;
882: extern char *sys_errlist[];
883: extern int sys_nerr;
884:
885: void GC_register_dynamic_libraries()
886: {
887: int status;
888: int index = 1; /* Ordinal position in shared library search list */
889: struct shl_descriptor *shl_desc; /* Shared library info, see dl.h */
890:
891: /* For each dynamic library loaded */
892: while (TRUE) {
893:
894: /* Get info about next shared library */
895: status = shl_get(index, &shl_desc);
896:
897: /* Check if this is the end of the list or if some error occured */
898: if (status != 0) {
1.6 noro 899: # ifdef GC_HPUX_THREADS
1.2 noro 900: /* I've seen errno values of 0. The man page is not clear */
901: /* as to whether errno should get set on a -1 return. */
902: break;
903: # else
1.1 noro 904: if (errno == EINVAL) {
905: break; /* Moved past end of shared library list --> finished */
906: } else {
907: if (errno <= sys_nerr) {
908: GC_printf1("dynamic_load: %s\n", (long) sys_errlist[errno]);
909: } else {
910: GC_printf1("dynamic_load: %d\n", (long) errno);
911: }
912: ABORT("shl_get failed");
913: }
1.2 noro 914: # endif
1.1 noro 915: }
916:
917: # ifdef VERBOSE
918: GC_printf0("---Shared library---\n");
919: GC_printf1("\tfilename = \"%s\"\n", shl_desc->filename);
920: GC_printf1("\tindex = %d\n", index);
921: GC_printf1("\thandle = %08x\n",
922: (unsigned long) shl_desc->handle);
923: GC_printf1("\ttext seg. start = %08x\n", shl_desc->tstart);
924: GC_printf1("\ttext seg. end = %08x\n", shl_desc->tend);
925: GC_printf1("\tdata seg. start = %08x\n", shl_desc->dstart);
926: GC_printf1("\tdata seg. end = %08x\n", shl_desc->dend);
927: GC_printf1("\tref. count = %lu\n", shl_desc->ref_count);
928: # endif
929:
930: /* register shared library's data segment as a garbage collection root */
931: GC_add_roots_inner((char *) shl_desc->dstart,
932: (char *) shl_desc->dend, TRUE);
933:
934: index++;
935: }
936: }
1.2 noro 937: #endif /* HPUX */
1.1 noro 938:
939: #ifdef RS6000
940: #pragma alloca
941: #include <sys/ldr.h>
942: #include <sys/errno.h>
943: void GC_register_dynamic_libraries()
944: {
945: int len;
946: char *ldibuf;
947: int ldibuflen;
948: struct ld_info *ldi;
949:
950: ldibuf = alloca(ldibuflen = 8192);
951:
952: while ( (len = loadquery(L_GETINFO,ldibuf,ldibuflen)) < 0) {
953: if (errno != ENOMEM) {
954: ABORT("loadquery failed");
955: }
956: ldibuf = alloca(ldibuflen *= 2);
957: }
958:
959: ldi = (struct ld_info *)ldibuf;
960: while (ldi) {
961: len = ldi->ldinfo_next;
962: GC_add_roots_inner(
963: ldi->ldinfo_dataorg,
1.7 ! noro 964: (ptr_t)(unsigned long)ldi->ldinfo_dataorg
1.1 noro 965: + ldi->ldinfo_datasize,
966: TRUE);
967: ldi = len ? (struct ld_info *)((char *)ldi + len) : 0;
968: }
969: }
970: #endif /* RS6000 */
971:
1.7 ! noro 972: #ifdef DARWIN
1.1 noro 973:
1.7 ! noro 974: #include <mach-o/dyld.h>
! 975: #include <mach-o/getsect.h>
! 976:
! 977: /*#define DARWIN_DEBUG*/
! 978:
! 979: const static struct {
! 980: const char *seg;
! 981: const char *sect;
! 982: } GC_dyld_sections[] = {
! 983: { SEG_DATA, SECT_DATA },
! 984: { SEG_DATA, SECT_BSS },
! 985: { SEG_DATA, SECT_COMMON }
! 986: };
! 987:
! 988: #ifdef DARWIN_DEBUG
! 989: static const char *GC_dyld_name_for_hdr(struct mach_header *hdr) {
! 990: unsigned long i,c;
! 991: c = _dyld_image_count();
! 992: for(i=0;i<c;i++) if(_dyld_get_image_header(i) == hdr)
! 993: return _dyld_get_image_name(i);
! 994: return NULL;
! 995: }
! 996: #endif
! 997:
! 998: /* This should never be called by a thread holding the lock */
! 999: static void GC_dyld_image_add(struct mach_header* hdr, unsigned long slide) {
! 1000: unsigned long start,end,i;
! 1001: const struct section *sec;
! 1002: for(i=0;i<sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]);i++) {
! 1003: sec = getsectbynamefromheader(
! 1004: hdr,GC_dyld_sections[i].seg,GC_dyld_sections[i].sect);
! 1005: if(sec == NULL || sec->size == 0) continue;
! 1006: start = slide + sec->addr;
! 1007: end = start + sec->size;
! 1008: # ifdef DARWIN_DEBUG
! 1009: GC_printf4("Adding section at %p-%p (%lu bytes) from image %s\n",
! 1010: start,end,sec->size,GC_dyld_name_for_hdr(hdr));
! 1011: # endif
! 1012: GC_add_roots((char*)start,(char*)end);
! 1013: }
! 1014: # ifdef DARWIN_DEBUG
! 1015: GC_print_static_roots();
! 1016: # endif
! 1017: }
! 1018:
! 1019: /* This should never be called by a thread holding the lock */
! 1020: static void GC_dyld_image_remove(struct mach_header* hdr, unsigned long slide) {
! 1021: unsigned long start,end,i;
! 1022: const struct section *sec;
! 1023: for(i=0;i<sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]);i++) {
! 1024: sec = getsectbynamefromheader(
! 1025: hdr,GC_dyld_sections[i].seg,GC_dyld_sections[i].sect);
! 1026: if(sec == NULL || sec->size == 0) continue;
! 1027: start = slide + sec->addr;
! 1028: end = start + sec->size;
! 1029: # ifdef DARWIN_DEBUG
! 1030: GC_printf4("Removing section at %p-%p (%lu bytes) from image %s\n",
! 1031: start,end,sec->size,GC_dyld_name_for_hdr(hdr));
! 1032: # endif
! 1033: GC_remove_roots((char*)start,(char*)end);
! 1034: }
! 1035: # ifdef DARWIN_DEBUG
! 1036: GC_print_static_roots();
! 1037: # endif
! 1038: }
! 1039:
! 1040: void GC_register_dynamic_libraries() {
! 1041: /* Currently does nothing. The callbacks are setup by GC_init_dyld()
! 1042: The dyld library takes it from there. */
! 1043: }
! 1044:
! 1045: /* The _dyld_* functions have an internal lock so no _dyld functions
! 1046: can be called while the world is stopped without the risk of a deadlock.
! 1047: Because of this we MUST setup callbacks BEFORE we ever stop the world.
! 1048: This should be called BEFORE any thread in created and WITHOUT the
! 1049: allocation lock held. */
! 1050:
! 1051: void GC_init_dyld() {
! 1052: static GC_bool initialized = FALSE;
! 1053:
! 1054: if(initialized) return;
! 1055:
! 1056: # ifdef DARWIN_DEBUG
! 1057: GC_printf0("Forcing full bind of GC code...\n");
! 1058: # endif
! 1059: if(!_dyld_bind_fully_image_containing_address((unsigned long*)GC_malloc))
! 1060: GC_abort("_dyld_bind_fully_image_containing_addres failed");
! 1061:
! 1062: # ifdef DARWIN_DEBUG
! 1063: GC_printf0("Registering dyld callbacks...\n");
! 1064: # endif
! 1065:
! 1066: /* Apple's Documentation:
! 1067: When you call _dyld_register_func_for_add_image, the dynamic linker runtime
! 1068: calls the specified callback (func) once for each of the images that is
! 1069: currently loaded into the program. When a new image is added to the program,
! 1070: your callback is called again with the mach_header for the new image, and the virtual memory slide amount of the new image.
! 1071:
! 1072: This WILL properly register existing and all future libraries
! 1073: */
! 1074:
! 1075: _dyld_register_func_for_add_image(GC_dyld_image_add);
! 1076: _dyld_register_func_for_remove_image(GC_dyld_image_remove);
! 1077: initialized = TRUE;
! 1078: }
! 1079:
! 1080: #define HAVE_REGISTER_MAIN_STATIC_DATA
! 1081: GC_bool GC_register_main_static_data()
! 1082: {
! 1083: /* Already done through dyld callbacks */
! 1084: return FALSE;
! 1085: }
! 1086:
! 1087: #endif /* DARWIN */
1.1 noro 1088:
1089: #else /* !DYNAMIC_LOADING */
1090:
1091: #ifdef PCR
1092:
1093: # include "il/PCR_IL.h"
1094: # include "th/PCR_ThCtl.h"
1095: # include "mm/PCR_MM.h"
1096:
1097: void GC_register_dynamic_libraries()
1098: {
1099: /* Add new static data areas of dynamically loaded modules. */
1100: {
1101: PCR_IL_LoadedFile * p = PCR_IL_GetLastLoadedFile();
1102: PCR_IL_LoadedSegment * q;
1103:
1104: /* Skip uncommited files */
1105: while (p != NIL && !(p -> lf_commitPoint)) {
1106: /* The loading of this file has not yet been committed */
1107: /* Hence its description could be inconsistent. */
1108: /* Furthermore, it hasn't yet been run. Hence its data */
1109: /* segments can't possibly reference heap allocated */
1110: /* objects. */
1111: p = p -> lf_prev;
1112: }
1113: for (; p != NIL; p = p -> lf_prev) {
1114: for (q = p -> lf_ls; q != NIL; q = q -> ls_next) {
1115: if ((q -> ls_flags & PCR_IL_SegFlags_Traced_MASK)
1116: == PCR_IL_SegFlags_Traced_on) {
1117: GC_add_roots_inner
1118: ((char *)(q -> ls_addr),
1119: (char *)(q -> ls_addr) + q -> ls_bytes,
1120: TRUE);
1121: }
1122: }
1123: }
1124: }
1125: }
1126:
1127:
1128: #else /* !PCR */
1129:
1130: void GC_register_dynamic_libraries(){}
1131:
1132: int GC_no_dynamic_loading;
1133:
1134: #endif /* !PCR */
1.7 ! noro 1135:
1.1 noro 1136: #endif /* !DYNAMIC_LOADING */
1.7 ! noro 1137:
! 1138: #ifndef HAVE_REGISTER_MAIN_STATIC_DATA
! 1139:
! 1140: /* Do we need to separately register the main static data segment? */
! 1141: GC_bool GC_register_main_static_data()
! 1142: {
! 1143: return TRUE;
! 1144: }
! 1145: #endif /* HAVE_REGISTER_MAIN_STATIC_DATA */
! 1146:
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