Annotation of OpenXM_contrib/gc/dyn_load.c, Revision 1.1.1.1
1.1 maekawa 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: */
29: #ifndef MACOS
30: # include <sys/types.h>
31: #endif
32: #include "gc_priv.h"
33:
34: /* BTL: avoid circular redefinition of dlopen if SOLARIS_THREADS defined */
35: # if defined(SOLARIS_THREADS) && defined(dlopen)
36: /* To support threads in Solaris, gc.h interposes on dlopen by */
37: /* defining "dlopen" to be "GC_dlopen", which is implemented below. */
38: /* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the */
39: /* real system dlopen() in their implementation. We first remove */
40: /* gc.h's dlopen definition and restore it later, after GC_dlopen(). */
41: # undef dlopen
42: # define GC_must_restore_redefined_dlopen
43: # else
44: # undef GC_must_restore_redefined_dlopen
45: # endif
46:
47: #if (defined(DYNAMIC_LOADING) || defined(MSWIN32)) && !defined(PCR)
48: #if !defined(SUNOS4) && !defined(SUNOS5DL) && !defined(IRIX5) && \
49: !defined(MSWIN32) && !(defined(ALPHA) && defined(OSF1)) && \
50: !defined(HP_PA) && !(defined(LINUX) && defined(__ELF__)) && \
51: !defined(RS6000) && !defined(SCO_ELF)
52: --> We only know how to find data segments of dynamic libraries for the
53: --> above. Additional SVR4 variants might not be too
54: --> hard to add.
55: #endif
56:
57: #include <stdio.h>
58: #ifdef SUNOS5DL
59: # include <sys/elf.h>
60: # include <dlfcn.h>
61: # include <link.h>
62: #endif
63: #ifdef SUNOS4
64: # include <dlfcn.h>
65: # include <link.h>
66: # include <a.out.h>
67: /* struct link_map field overrides */
68: # define l_next lm_next
69: # define l_addr lm_addr
70: # define l_name lm_name
71: #endif
72:
73:
74: #if defined(SUNOS5DL) && !defined(USE_PROC_FOR_LIBRARIES)
75:
76: #ifdef LINT
77: Elf32_Dyn _DYNAMIC;
78: #endif
79:
80: static struct link_map *
81: GC_FirstDLOpenedLinkMap()
82: {
83: extern Elf32_Dyn _DYNAMIC;
84: Elf32_Dyn *dp;
85: struct r_debug *r;
86: static struct link_map * cachedResult = 0;
87: static Elf32_Dyn *dynStructureAddr = 0;
88: /* BTL: added to avoid Solaris 5.3 ld.so _DYNAMIC bug */
89:
90: # ifdef SUNOS53_SHARED_LIB
91: /* BTL: Avoid the Solaris 5.3 bug that _DYNAMIC isn't being set */
92: /* up properly in dynamically linked .so's. This means we have */
93: /* to use its value in the set of original object files loaded */
94: /* at program startup. */
95: if( dynStructureAddr == 0 ) {
96: void* startupSyms = dlopen(0, RTLD_LAZY);
97: dynStructureAddr = (Elf32_Dyn*)dlsym(startupSyms, "_DYNAMIC");
98: }
99: # else
100: dynStructureAddr = &_DYNAMIC;
101: # endif
102:
103: if( dynStructureAddr == 0) {
104: return(0);
105: }
106: if( cachedResult == 0 ) {
107: int tag;
108: for( dp = ((Elf32_Dyn *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) {
109: if( tag == DT_DEBUG ) {
110: struct link_map *lm
111: = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
112: if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
113: break;
114: }
115: }
116: }
117: return cachedResult;
118: }
119:
120: #endif /* SUNOS5DL ... */
121:
122: #if defined(SUNOS4) && !defined(USE_PROC_FOR_LIBRARIES)
123:
124: #ifdef LINT
125: struct link_dynamic _DYNAMIC;
126: #endif
127:
128: static struct link_map *
129: GC_FirstDLOpenedLinkMap()
130: {
131: extern struct link_dynamic _DYNAMIC;
132:
133: if( &_DYNAMIC == 0) {
134: return(0);
135: }
136: return(_DYNAMIC.ld_un.ld_1->ld_loaded);
137: }
138:
139: /* Return the address of the ld.so allocated common symbol */
140: /* with the least address, or 0 if none. */
141: static ptr_t GC_first_common()
142: {
143: ptr_t result = 0;
144: extern struct link_dynamic _DYNAMIC;
145: struct rtc_symb * curr_symbol;
146:
147: if( &_DYNAMIC == 0) {
148: return(0);
149: }
150: curr_symbol = _DYNAMIC.ldd -> ldd_cp;
151: for (; curr_symbol != 0; curr_symbol = curr_symbol -> rtc_next) {
152: if (result == 0
153: || (ptr_t)(curr_symbol -> rtc_sp -> n_value) < result) {
154: result = (ptr_t)(curr_symbol -> rtc_sp -> n_value);
155: }
156: }
157: return(result);
158: }
159:
160: #endif /* SUNOS4 ... */
161:
162: # if defined(SUNOS4) || defined(SUNOS5DL)
163: /* Add dynamic library data sections to the root set. */
164: # if !defined(PCR) && !defined(SOLARIS_THREADS) && defined(THREADS)
165: # ifndef SRC_M3
166: --> fix mutual exclusion with dlopen
167: # endif /* We assume M3 programs don't call dlopen for now */
168: # endif
169:
170: # ifdef SOLARIS_THREADS
171: /* Redefine dlopen to guarantee mutual exclusion with */
172: /* GC_register_dynamic_libraries. */
173: /* assumes that dlopen doesn't need to call GC_malloc */
174: /* and friends. */
175: # include <thread.h>
176: # include <synch.h>
177:
178: void * GC_dlopen(const char *path, int mode)
179: {
180: void * result;
181:
182: # ifndef USE_PROC_FOR_LIBRARIES
183: mutex_lock(&GC_allocate_ml);
184: # endif
185: result = dlopen(path, mode);
186: # ifndef USE_PROC_FOR_LIBRARIES
187: mutex_unlock(&GC_allocate_ml);
188: # endif
189: return(result);
190: }
191: # endif /* SOLARIS_THREADS */
192:
193: /* BTL: added to fix circular dlopen definition if SOLARIS_THREADS defined */
194: # if defined(GC_must_restore_redefined_dlopen)
195: # define dlopen GC_dlopen
196: # endif
197:
198: # ifndef USE_PROC_FOR_LIBRARIES
199: void GC_register_dynamic_libraries()
200: {
201: struct link_map *lm = GC_FirstDLOpenedLinkMap();
202:
203:
204: for (lm = GC_FirstDLOpenedLinkMap();
205: lm != (struct link_map *) 0; lm = lm->l_next)
206: {
207: # ifdef SUNOS4
208: struct exec *e;
209:
210: e = (struct exec *) lm->lm_addr;
211: GC_add_roots_inner(
212: ((char *) (N_DATOFF(*e) + lm->lm_addr)),
213: ((char *) (N_BSSADDR(*e) + e->a_bss + lm->lm_addr)),
214: TRUE);
215: # endif
216: # ifdef SUNOS5DL
217: Elf32_Ehdr * e;
218: Elf32_Phdr * p;
219: unsigned long offset;
220: char * start;
221: register int i;
222:
223: e = (Elf32_Ehdr *) lm->l_addr;
224: p = ((Elf32_Phdr *)(((char *)(e)) + e->e_phoff));
225: offset = ((unsigned long)(lm->l_addr));
226: for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
227: switch( p->p_type ) {
228: case PT_LOAD:
229: {
230: if( !(p->p_flags & PF_W) ) break;
231: start = ((char *)(p->p_vaddr)) + offset;
232: GC_add_roots_inner(
233: start,
234: start + p->p_memsz,
235: TRUE
236: );
237: }
238: break;
239: default:
240: break;
241: }
242: }
243: # endif
244: }
245: # ifdef SUNOS4
246: {
247: static ptr_t common_start = 0;
248: ptr_t common_end;
249: extern ptr_t GC_find_limit();
250:
251: if (common_start == 0) common_start = GC_first_common();
252: if (common_start != 0) {
253: common_end = GC_find_limit(common_start, TRUE);
254: GC_add_roots_inner((char *)common_start, (char *)common_end, TRUE);
255: }
256: }
257: # endif
258: }
259:
260: # endif /* !USE_PROC ... */
261: # endif /* SUNOS */
262:
263: #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF)
264:
265: /* Dynamic loading code for Linux running ELF. Somewhat tested on
266: * Linux/x86, untested but hopefully should work on Linux/Alpha.
267: * This code was derived from the Solaris/ELF support. Thanks to
268: * whatever kind soul wrote that. - Patrick Bridges */
269:
270: #include <elf.h>
271: #include <link.h>
272:
273: /* Newer versions of Linux/Alpha and Linux/x86 define this macro. We
274: * define it for those older versions that don't. */
275: # ifndef ElfW
276: # if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32
277: # define ElfW(type) Elf32_##type
278: # else
279: # define ElfW(type) Elf64_##type
280: # endif
281: # endif
282:
283: static struct link_map *
284: GC_FirstDLOpenedLinkMap()
285: {
286: extern ElfW(Dyn) _DYNAMIC[];
287: ElfW(Dyn) *dp;
288: struct r_debug *r;
289: static struct link_map *cachedResult = 0;
290:
291: if( _DYNAMIC == 0) {
292: return(0);
293: }
294: if( cachedResult == 0 ) {
295: int tag;
296: for( dp = _DYNAMIC; (tag = dp->d_tag) != 0; dp++ ) {
297: if( tag == DT_DEBUG ) {
298: struct link_map *lm
299: = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
300: if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
301: break;
302: }
303: }
304: }
305: return cachedResult;
306: }
307:
308:
309: void GC_register_dynamic_libraries()
310: {
311: struct link_map *lm = GC_FirstDLOpenedLinkMap();
312:
313:
314: for (lm = GC_FirstDLOpenedLinkMap();
315: lm != (struct link_map *) 0; lm = lm->l_next)
316: {
317: ElfW(Ehdr) * e;
318: ElfW(Phdr) * p;
319: unsigned long offset;
320: char * start;
321: register int i;
322:
323: e = (ElfW(Ehdr) *) lm->l_addr;
324: p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
325: offset = ((unsigned long)(lm->l_addr));
326: for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
327: switch( p->p_type ) {
328: case PT_LOAD:
329: {
330: if( !(p->p_flags & PF_W) ) break;
331: start = ((char *)(p->p_vaddr)) + offset;
332: GC_add_roots_inner(start, start + p->p_memsz, TRUE);
333: }
334: break;
335: default:
336: break;
337: }
338: }
339: }
340: }
341:
342: #endif
343:
344: #if defined(IRIX5) || defined(USE_PROC_FOR_LIBRARIES)
345:
346: #include <sys/procfs.h>
347: #include <sys/stat.h>
348: #include <fcntl.h>
349: #include <elf.h>
350: #include <errno.h>
351:
352: extern void * GC_roots_present();
353: /* The type is a lie, since the real type doesn't make sense here, */
354: /* and we only test for NULL. */
355:
356: extern ptr_t GC_scratch_last_end_ptr; /* End of GC_scratch_alloc arena */
357:
358: /* We use /proc to track down all parts of the address space that are */
359: /* mapped by the process, and throw out regions we know we shouldn't */
360: /* worry about. This may also work under other SVR4 variants. */
361: void GC_register_dynamic_libraries()
362: {
363: static int fd = -1;
364: char buf[30];
365: static prmap_t * addr_map = 0;
366: static int current_sz = 0; /* Number of records currently in addr_map */
367: static int needed_sz; /* Required size of addr_map */
368: register int i;
369: register long flags;
370: register ptr_t start;
371: register ptr_t limit;
372: ptr_t heap_start = (ptr_t)HEAP_START;
373: ptr_t heap_end = heap_start;
374:
375: # ifdef SUNOS5DL
376: # define MA_PHYS 0
377: # endif /* SUNOS5DL */
378:
379: if (fd < 0) {
380: sprintf(buf, "/proc/%d", getpid());
381: /* The above generates a lint complaint, since pid_t varies. */
382: /* It's unclear how to improve this. */
383: fd = open(buf, O_RDONLY);
384: if (fd < 0) {
385: ABORT("/proc open failed");
386: }
387: }
388: if (ioctl(fd, PIOCNMAP, &needed_sz) < 0) {
389: GC_err_printf2("fd = %d, errno = %d\n", fd, errno);
390: ABORT("/proc PIOCNMAP ioctl failed");
391: }
392: if (needed_sz >= current_sz) {
393: current_sz = needed_sz * 2 + 1;
394: /* Expansion, plus room for 0 record */
395: addr_map = (prmap_t *)GC_scratch_alloc((word)
396: (current_sz * sizeof(prmap_t)));
397: }
398: if (ioctl(fd, PIOCMAP, addr_map) < 0) {
399: GC_err_printf4("fd = %d, errno = %d, needed_sz = %d, addr_map = 0x%X\n",
400: fd, errno, needed_sz, addr_map);
401: ABORT("/proc PIOCMAP ioctl failed");
402: };
403: if (GC_n_heap_sects > 0) {
404: heap_end = GC_heap_sects[GC_n_heap_sects-1].hs_start
405: + GC_heap_sects[GC_n_heap_sects-1].hs_bytes;
406: if (heap_end < GC_scratch_last_end_ptr) heap_end = GC_scratch_last_end_ptr;
407: }
408: for (i = 0; i < needed_sz; i++) {
409: flags = addr_map[i].pr_mflags;
410: if ((flags & (MA_BREAK | MA_STACK | MA_PHYS)) != 0) goto irrelevant;
411: if ((flags & (MA_READ | MA_WRITE)) != (MA_READ | MA_WRITE))
412: goto irrelevant;
413: /* The latter test is empirically useless. Other than the */
414: /* main data and stack segments, everything appears to be */
415: /* mapped readable, writable, executable, and shared(!!). */
416: /* This makes no sense to me. - HB */
417: start = (ptr_t)(addr_map[i].pr_vaddr);
418: if (GC_roots_present(start)) goto irrelevant;
419: if (start < heap_end && start >= heap_start)
420: goto irrelevant;
421: # ifdef MMAP_STACKS
422: if (GC_is_thread_stack(start)) goto irrelevant;
423: # endif /* MMAP_STACKS */
424:
425: limit = start + addr_map[i].pr_size;
426: if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) {
427: /* Discard text segments, i.e. 0-offset mappings against */
428: /* executable files which appear to have ELF headers. */
429: caddr_t arg;
430: int obj;
431: # define MAP_IRR_SZ 10
432: static ptr_t map_irr[MAP_IRR_SZ];
433: /* Known irrelevant map entries */
434: static int n_irr = 0;
435: struct stat buf;
436: register int i;
437:
438: for (i = 0; i < n_irr; i++) {
439: if (map_irr[i] == start) goto irrelevant;
440: }
441: arg = (caddr_t)start;
442: obj = ioctl(fd, PIOCOPENM, &arg);
443: if (obj >= 0) {
444: fstat(obj, &buf);
445: close(obj);
446: if ((buf.st_mode & 0111) != 0) {
447: if (n_irr < MAP_IRR_SZ) {
448: map_irr[n_irr++] = start;
449: }
450: goto irrelevant;
451: }
452: }
453: }
454: GC_add_roots_inner(start, limit, TRUE);
455: irrelevant: ;
456: }
457: /* Dont keep cached descriptor, for now. Some kernels don't like us */
458: /* to keep a /proc file descriptor around during kill -9. */
459: if (close(fd) < 0) ABORT("Couldnt close /proc file");
460: fd = -1;
461: }
462:
463: # endif /* USE_PROC || IRIX5 */
464:
465: # ifdef MSWIN32
466:
467: # define WIN32_LEAN_AND_MEAN
468: # define NOSERVICE
469: # include <windows.h>
470: # include <stdlib.h>
471:
472: /* We traverse the entire address space and register all segments */
473: /* that could possibly have been written to. */
474: DWORD GC_allocation_granularity;
475:
476: extern GC_bool GC_is_heap_base (ptr_t p);
477:
478: # ifdef WIN32_THREADS
479: extern void GC_get_next_stack(char *start, char **lo, char **hi);
480: # endif
481:
482: void GC_cond_add_roots(char *base, char * limit)
483: {
484: char dummy;
485: char * stack_top
486: = (char *) ((word)(&dummy) & ~(GC_allocation_granularity-1));
487: if (base == limit) return;
488: # ifdef WIN32_THREADS
489: {
490: char * curr_base = base;
491: char * next_stack_lo;
492: char * next_stack_hi;
493:
494: for(;;) {
495: GC_get_next_stack(curr_base, &next_stack_lo, &next_stack_hi);
496: if (next_stack_lo >= limit) break;
497: GC_add_roots_inner(curr_base, next_stack_lo, TRUE);
498: curr_base = next_stack_hi;
499: }
500: if (curr_base < limit) GC_add_roots_inner(curr_base, limit, TRUE);
501: }
502: # else
503: if (limit > stack_top && base < GC_stackbottom) {
504: /* Part of the stack; ignore it. */
505: return;
506: }
507: GC_add_roots_inner(base, limit, TRUE);
508: # endif
509: }
510:
511: extern GC_bool GC_win32s;
512:
513: void GC_register_dynamic_libraries()
514: {
515: MEMORY_BASIC_INFORMATION buf;
516: SYSTEM_INFO sysinfo;
517: DWORD result;
518: DWORD protect;
519: LPVOID p;
520: char * base;
521: char * limit, * new_limit;
522:
523: if (GC_win32s) return;
524: GetSystemInfo(&sysinfo);
525: base = limit = p = sysinfo.lpMinimumApplicationAddress;
526: GC_allocation_granularity = sysinfo.dwAllocationGranularity;
527: while (p < sysinfo.lpMaximumApplicationAddress) {
528: result = VirtualQuery(p, &buf, sizeof(buf));
529: if (result != sizeof(buf)) {
530: ABORT("Weird VirtualQuery result");
531: }
532: new_limit = (char *)p + buf.RegionSize;
533: protect = buf.Protect;
534: if (buf.State == MEM_COMMIT
535: && (protect == PAGE_EXECUTE_READWRITE
536: || protect == PAGE_READWRITE)
537: && !GC_is_heap_base(buf.AllocationBase)) {
538: if ((char *)p == limit) {
539: limit = new_limit;
540: } else {
541: GC_cond_add_roots(base, limit);
542: base = p;
543: limit = new_limit;
544: }
545: }
546: if (p > (LPVOID)new_limit /* overflow */) break;
547: p = (LPVOID)new_limit;
548: }
549: GC_cond_add_roots(base, limit);
550: }
551:
552: #endif /* MSWIN32 */
553:
554: #if defined(ALPHA) && defined(OSF1)
555:
556: #include <loader.h>
557:
558: void GC_register_dynamic_libraries()
559: {
560: int status;
561: ldr_process_t mypid;
562:
563: /* module */
564: ldr_module_t moduleid = LDR_NULL_MODULE;
565: ldr_module_info_t moduleinfo;
566: size_t moduleinfosize = sizeof(moduleinfo);
567: size_t modulereturnsize;
568:
569: /* region */
570: ldr_region_t region;
571: ldr_region_info_t regioninfo;
572: size_t regioninfosize = sizeof(regioninfo);
573: size_t regionreturnsize;
574:
575: /* Obtain id of this process */
576: mypid = ldr_my_process();
577:
578: /* For each module */
579: while (TRUE) {
580:
581: /* Get the next (first) module */
582: status = ldr_next_module(mypid, &moduleid);
583:
584: /* Any more modules? */
585: if (moduleid == LDR_NULL_MODULE)
586: break; /* No more modules */
587:
588: /* Check status AFTER checking moduleid because */
589: /* of a bug in the non-shared ldr_next_module stub */
590: if (status != 0 ) {
591: GC_printf1("dynamic_load: status = %ld\n", (long)status);
592: {
593: extern char *sys_errlist[];
594: extern int sys_nerr;
595: extern int errno;
596: if (errno <= sys_nerr) {
597: GC_printf1("dynamic_load: %s\n", (long)sys_errlist[errno]);
598: } else {
599: GC_printf1("dynamic_load: %d\n", (long)errno);
600: }
601: }
602: ABORT("ldr_next_module failed");
603: }
604:
605: /* Get the module information */
606: status = ldr_inq_module(mypid, moduleid, &moduleinfo,
607: moduleinfosize, &modulereturnsize);
608: if (status != 0 )
609: ABORT("ldr_inq_module failed");
610:
611: /* is module for the main program (i.e. nonshared portion)? */
612: if (moduleinfo.lmi_flags & LDR_MAIN)
613: continue; /* skip the main module */
614:
615: # ifdef VERBOSE
616: GC_printf("---Module---\n");
617: GC_printf("Module ID = %16ld\n", moduleinfo.lmi_modid);
618: GC_printf("Count of regions = %16d\n", moduleinfo.lmi_nregion);
619: GC_printf("flags for module = %16lx\n", moduleinfo.lmi_flags);
620: GC_printf("pathname of module = \"%s\"\n", moduleinfo.lmi_name);
621: # endif
622:
623: /* For each region in this module */
624: for (region = 0; region < moduleinfo.lmi_nregion; region++) {
625:
626: /* Get the region information */
627: status = ldr_inq_region(mypid, moduleid, region, ®ioninfo,
628: regioninfosize, ®ionreturnsize);
629: if (status != 0 )
630: ABORT("ldr_inq_region failed");
631:
632: /* only process writable (data) regions */
633: if (! (regioninfo.lri_prot & LDR_W))
634: continue;
635:
636: # ifdef VERBOSE
637: GC_printf("--- Region ---\n");
638: GC_printf("Region number = %16ld\n",
639: regioninfo.lri_region_no);
640: GC_printf("Protection flags = %016x\n", regioninfo.lri_prot);
641: GC_printf("Virtual address = %16p\n", regioninfo.lri_vaddr);
642: GC_printf("Mapped address = %16p\n", regioninfo.lri_mapaddr);
643: GC_printf("Region size = %16ld\n", regioninfo.lri_size);
644: GC_printf("Region name = \"%s\"\n", regioninfo.lri_name);
645: # endif
646:
647: /* register region as a garbage collection root */
648: GC_add_roots_inner (
649: (char *)regioninfo.lri_mapaddr,
650: (char *)regioninfo.lri_mapaddr + regioninfo.lri_size,
651: TRUE);
652:
653: }
654: }
655: }
656: #endif
657:
658: #if defined(HP_PA)
659:
660: #include <errno.h>
661: #include <dl.h>
662:
663: extern int errno;
664: extern char *sys_errlist[];
665: extern int sys_nerr;
666:
667: void GC_register_dynamic_libraries()
668: {
669: int status;
670: int index = 1; /* Ordinal position in shared library search list */
671: struct shl_descriptor *shl_desc; /* Shared library info, see dl.h */
672:
673: /* For each dynamic library loaded */
674: while (TRUE) {
675:
676: /* Get info about next shared library */
677: status = shl_get(index, &shl_desc);
678:
679: /* Check if this is the end of the list or if some error occured */
680: if (status != 0) {
681: if (errno == EINVAL) {
682: break; /* Moved past end of shared library list --> finished */
683: } else {
684: if (errno <= sys_nerr) {
685: GC_printf1("dynamic_load: %s\n", (long) sys_errlist[errno]);
686: } else {
687: GC_printf1("dynamic_load: %d\n", (long) errno);
688: }
689: ABORT("shl_get failed");
690: }
691: }
692:
693: # ifdef VERBOSE
694: GC_printf0("---Shared library---\n");
695: GC_printf1("\tfilename = \"%s\"\n", shl_desc->filename);
696: GC_printf1("\tindex = %d\n", index);
697: GC_printf1("\thandle = %08x\n",
698: (unsigned long) shl_desc->handle);
699: GC_printf1("\ttext seg. start = %08x\n", shl_desc->tstart);
700: GC_printf1("\ttext seg. end = %08x\n", shl_desc->tend);
701: GC_printf1("\tdata seg. start = %08x\n", shl_desc->dstart);
702: GC_printf1("\tdata seg. end = %08x\n", shl_desc->dend);
703: GC_printf1("\tref. count = %lu\n", shl_desc->ref_count);
704: # endif
705:
706: /* register shared library's data segment as a garbage collection root */
707: GC_add_roots_inner((char *) shl_desc->dstart,
708: (char *) shl_desc->dend, TRUE);
709:
710: index++;
711: }
712: }
713: #endif /* HP_PA */
714:
715: #ifdef RS6000
716: #pragma alloca
717: #include <sys/ldr.h>
718: #include <sys/errno.h>
719: void GC_register_dynamic_libraries()
720: {
721: int len;
722: char *ldibuf;
723: int ldibuflen;
724: struct ld_info *ldi;
725:
726: ldibuf = alloca(ldibuflen = 8192);
727:
728: while ( (len = loadquery(L_GETINFO,ldibuf,ldibuflen)) < 0) {
729: if (errno != ENOMEM) {
730: ABORT("loadquery failed");
731: }
732: ldibuf = alloca(ldibuflen *= 2);
733: }
734:
735: ldi = (struct ld_info *)ldibuf;
736: while (ldi) {
737: len = ldi->ldinfo_next;
738: GC_add_roots_inner(
739: ldi->ldinfo_dataorg,
740: (unsigned long)ldi->ldinfo_dataorg
741: + ldi->ldinfo_datasize,
742: TRUE);
743: ldi = len ? (struct ld_info *)((char *)ldi + len) : 0;
744: }
745: }
746: #endif /* RS6000 */
747:
748:
749:
750: #else /* !DYNAMIC_LOADING */
751:
752: #ifdef PCR
753:
754: # include "il/PCR_IL.h"
755: # include "th/PCR_ThCtl.h"
756: # include "mm/PCR_MM.h"
757:
758: void GC_register_dynamic_libraries()
759: {
760: /* Add new static data areas of dynamically loaded modules. */
761: {
762: PCR_IL_LoadedFile * p = PCR_IL_GetLastLoadedFile();
763: PCR_IL_LoadedSegment * q;
764:
765: /* Skip uncommited files */
766: while (p != NIL && !(p -> lf_commitPoint)) {
767: /* The loading of this file has not yet been committed */
768: /* Hence its description could be inconsistent. */
769: /* Furthermore, it hasn't yet been run. Hence its data */
770: /* segments can't possibly reference heap allocated */
771: /* objects. */
772: p = p -> lf_prev;
773: }
774: for (; p != NIL; p = p -> lf_prev) {
775: for (q = p -> lf_ls; q != NIL; q = q -> ls_next) {
776: if ((q -> ls_flags & PCR_IL_SegFlags_Traced_MASK)
777: == PCR_IL_SegFlags_Traced_on) {
778: GC_add_roots_inner
779: ((char *)(q -> ls_addr),
780: (char *)(q -> ls_addr) + q -> ls_bytes,
781: TRUE);
782: }
783: }
784: }
785: }
786: }
787:
788:
789: #else /* !PCR */
790:
791: void GC_register_dynamic_libraries(){}
792:
793: int GC_no_dynamic_loading;
794:
795: #endif /* !PCR */
796: #endif /* !DYNAMIC_LOADING */
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