summaryrefslogtreecommitdiff
path: root/ldso/libdl/libdl.c
blob: 83dfd089816188748de74badc8a01ccd94efabf9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
/* vi: set sw=4 ts=4: */
/*
 * Program to load an ELF binary on a linux system, and run it
 * after resolving ELF shared library symbols
 *
 * Copyright (C) 2000-2006 by Erik Andersen <andersen@uclibc.org>
 * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
 *				David Engel, Hongjiu Lu and Mitch D'Souza
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the above contributors may not be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */


#include <ldso.h>
#include <stdio.h>
#include <string.h> /* Needed for 'strstr' prototype' */
#include <stdbool.h>

#ifdef __UCLIBC_HAS_TLS__
#include <tls.h>
#endif

#if defined(USE_TLS) && USE_TLS
#include <ldsodefs.h>
extern void _dl_add_to_slotinfo(struct link_map  *l);
#endif

#ifdef SHARED
# if defined(USE_TLS) && USE_TLS
# include <dl-tls.h>
extern struct link_map *_dl_update_slotinfo(unsigned long int req_modid);
# endif

/* When libdl is loaded as a shared library, we need to load in
 * and use a pile of symbols from ldso... */

extern struct elf_resolve * _dl_load_shared_library(int, struct dyn_elf **,
	struct elf_resolve *, char *, int);
extern int _dl_fixup(struct dyn_elf *rpnt, struct r_scope_elem *scope, int lazy);
extern void _dl_protect_relro(struct elf_resolve * tpnt);
extern int _dl_errno;
extern struct dyn_elf *_dl_symbol_tables;
extern struct dyn_elf *_dl_handles;
extern struct elf_resolve *_dl_loaded_modules;
extern void _dl_free (void *__ptr);
extern struct r_debug *_dl_debug_addr;
extern unsigned long _dl_error_number;
extern void *(*_dl_malloc_function)(size_t);
extern void (*_dl_free_function) (void *p);
extern void _dl_run_init_array(struct elf_resolve *);
extern void _dl_run_fini_array(struct elf_resolve *);
#ifdef __LDSO_CACHE_SUPPORT__
int _dl_map_cache(void);
int _dl_unmap_cache(void);
#endif
#ifdef __mips__
extern void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt, int lazy);
#endif
#ifdef __SUPPORT_LD_DEBUG__
extern char *_dl_debug;
#endif

#else /* !SHARED */

#define _dl_malloc malloc
#define _dl_free free

/* When libdl is linked as a static library, we need to replace all
 * the symbols that otherwise would have been loaded in from ldso... */

#ifdef __SUPPORT_LD_DEBUG__
char *_dl_debug  = NULL;
char *_dl_debug_symbols   = NULL;
char *_dl_debug_move      = NULL;
char *_dl_debug_reloc     = NULL;
char *_dl_debug_detail    = NULL;
char *_dl_debug_nofixups  = NULL;
char *_dl_debug_bindings  = NULL;
int   _dl_debug_file      = 2;
#endif
const char *_dl_progname       = "";        /* Program name */
void *(*_dl_malloc_function)(size_t);
void (*_dl_free_function) (void *p);
char *_dl_library_path         = NULL;         /* Where we look for libraries */
char *_dl_ldsopath             = NULL;         /* Location of the shared lib loader */
int _dl_errno                  = 0;         /* We can't use the real errno in ldso */
size_t _dl_pagesize            = PAGE_SIZE; /* Store the page size for use later */
/* This global variable is also to communicate with debuggers such as gdb. */
struct r_debug *_dl_debug_addr = NULL;

#include "../ldso/dl-array.c"
#include "../ldso/dl-debug.c"


# if defined(USE_TLS) && USE_TLS
/*
 * Giving this initialized value preallocates some surplus bytes in the
 * static TLS area, see __libc_setup_tls (libc-tls.c).
 */
size_t _dl_tls_static_size = 2048;
# endif
#include LDSO_ELFINTERP
#include "../ldso/dl-hash.c"
#define _dl_trace_loaded_objects    0
#include "../ldso/dl-elf.c"
#endif /* SHARED */

#ifdef __SUPPORT_LD_DEBUG__
# define _dl_if_debug_print(fmt, args...) \
	do { \
	if (_dl_debug) \
		fprintf(stderr, "%s():%i: " fmt, __FUNCTION__, __LINE__, ## args); \
	} while (0)
#else
# define _dl_if_debug_print(fmt, args...)
#endif

static int do_dlclose(void *, int need_fini);


static const char *const dl_error_names[] = {
	"",
	"File not found",
	"Unable to open /dev/zero",
	"Not an ELF file",
#if defined (__i386__)
	"Not i386 binary",
#elif defined (__sparc__)
	"Not sparc binary",
#elif defined (__mc68000__)
	"Not m68k binary",
#else
	"Unrecognized binary type",
#endif
	"Not an ELF shared library",
	"Unable to mmap file",
	"No dynamic section",
	"Library contains unsupported TLS",
#ifdef ELF_USES_RELOCA
	"Unable to process REL relocs",
#else
	"Unable to process RELA relocs",
#endif
	"Bad handle",
	"Unable to resolve symbol"
};


#if defined(USE_TLS) && USE_TLS
#ifdef SHARED
/*
 * Systems which do not have tls_index also probably have to define
 * DONT_USE_TLS_INDEX.
 */

# ifndef __TLS_GET_ADDR
#  define __TLS_GET_ADDR __tls_get_addr
# endif

/*
 * Return the symbol address given the map of the module it is in and
 *  the symbol record.  This is used in dl-sym.c.
 */
static void *
internal_function
_dl_tls_symaddr(struct link_map *map, const Elf32_Addr st_value)
{
# ifndef DONT_USE_TLS_INDEX
	tls_index tmp =
	{
		.ti_module = map->l_tls_modid,
		.ti_offset = st_value
	};

	return __TLS_GET_ADDR (&tmp);
# else
	return __TLS_GET_ADDR (map->l_tls_modid, st_value);
# endif
}
#endif

/* Returns true when a non-empty entry was found.  */
static bool
remove_slotinfo(size_t idx, struct dtv_slotinfo_list *listp, size_t disp,
	 bool should_be_there)
{
	if (idx - disp >= listp->len) {
		if (listp->next == NULL) {
			/*
			 * The index is not actually valid in the slotinfo list,
			 * because this object was closed before it was fully set
			 * up due to some error.
			 */
			_dl_assert(!should_be_there);
		} else {
			if (remove_slotinfo(idx, listp->next, disp + listp->len,
					should_be_there))
				return true;

			/*
			 * No non-empty entry. Search from the end of this element's
			 * slotinfo array.
			 */
			idx = disp + listp->len;
		}
	} else {
		struct link_map *old_map = listp->slotinfo[idx - disp].map;

		/*
		 * The entry might still be in its unused state if we are
		 * closing an object that wasn't fully set up.
		 */
		if (__builtin_expect(old_map != NULL, 1)) {
			_dl_assert(old_map->l_tls_modid == idx);

			/* Mark the entry as unused. */
			listp->slotinfo[idx - disp].gen = _dl_tls_generation + 1;
			listp->slotinfo[idx - disp].map = NULL;
		}

		/*
		 * If this is not the last currently used entry no need to
		 * look further.
		 */
		if (idx != _dl_tls_max_dtv_idx)
			return true;
	}

	while (idx - disp > (disp == 0 ? 1 + _dl_tls_static_nelem : 0)) {
		--idx;

		if (listp->slotinfo[idx - disp].map != NULL) {
			/* Found a new last used index.  */
			_dl_tls_max_dtv_idx = idx;
			return true;
		}
	}

	/* No non-entry in this list element.  */
	return false;
}
#endif

void dl_cleanup(void) __attribute__ ((destructor));
void dl_cleanup(void)
{
	struct dyn_elf *h, *n;

	for (h = _dl_handles; h; h = n) {
		n = h->next_handle;
		do_dlclose(h, 1);
	}
}

static ptrdiff_t _dl_build_local_scope (struct elf_resolve **list,
	struct elf_resolve *map)
{
	struct elf_resolve **p = list;
	struct init_fini_list *q;

	*p++ = map;
	map->init_flag |= DL_RESERVED;
	if (map->init_fini)
		for (q = map->init_fini; q; q = q->next)
			if (! (q->tpnt->init_flag & DL_RESERVED))
				p += _dl_build_local_scope (p, q->tpnt);
	return p - list;
}

void *dlopen(const char *libname, int flag)
{
	struct elf_resolve *tpnt, *tfrom;
	struct dyn_elf *dyn_chain, *rpnt = NULL, *dyn_ptr, *relro_ptr, *handle;
	ElfW(Addr) from;
	struct elf_resolve *tpnt1;
	void (*dl_brk) (void);
	int now_flag;
	struct init_fini_list *tmp, *runp, *runp2, *dep_list;
	unsigned int nlist, i;
	struct elf_resolve **init_fini_list;
	static bool _dl_init;
	struct elf_resolve **local_scope;
	struct r_scope_elem *ls;
#if defined(USE_TLS) && USE_TLS
	bool any_tls = false;
#endif

	/* A bit of sanity checking... */
	if (!(flag & (RTLD_LAZY|RTLD_NOW))) {
		_dl_error_number = LD_BAD_HANDLE;
		return NULL;
	}

	from = (ElfW(Addr)) __builtin_return_address(0);

	if (!_dl_init) {
		_dl_init = true;
		_dl_malloc_function = malloc;
		_dl_free_function = free;
	}
	/* Cover the trivial case first */
	if (!libname)
		return _dl_symbol_tables;

#ifndef SHARED
# ifdef __SUPPORT_LD_DEBUG__
	_dl_debug = getenv("LD_DEBUG");
	if (_dl_debug) {
		if (_dl_strstr(_dl_debug, "all")) {
			_dl_debug_detail = _dl_debug_move = _dl_debug_symbols
				= _dl_debug_reloc = _dl_debug_bindings = _dl_debug_nofixups = (void*)1;
		} else {
			_dl_debug_detail   = strstr(_dl_debug, "detail");
			_dl_debug_move     = strstr(_dl_debug, "move");
			_dl_debug_symbols  = strstr(_dl_debug, "sym");
			_dl_debug_reloc    = strstr(_dl_debug, "reloc");
			_dl_debug_nofixups = strstr(_dl_debug, "nofix");
			_dl_debug_bindings = strstr(_dl_debug, "bind");
		}
	}
# endif
#endif

	_dl_map_cache();

	/*
	 * Try and locate the module we were called from - we
	 * need this so that we get the correct RPATH/RUNPATH.  Note that
	 * this is the current behavior under Solaris, but the
	 * ABI+ specifies that we should only use the RPATH from
	 * the application.  Thus this may go away at some time
	 * in the future.
	 */
	{
		struct dyn_elf *dpnt;
		tfrom = NULL;
		for (dpnt = _dl_symbol_tables; dpnt; dpnt = dpnt->next) {
			tpnt = dpnt->dyn;
			if (DL_ADDR_IN_LOADADDR(from, tpnt, tfrom))
				tfrom = tpnt;
		}
	}
	for (rpnt = _dl_symbol_tables; rpnt && rpnt->next; rpnt = rpnt->next)
		continue;

	relro_ptr = rpnt;
	now_flag = (flag & RTLD_NOW) ? RTLD_NOW : 0;
	if (getenv("LD_BIND_NOW"))
		now_flag = RTLD_NOW;

#ifndef SHARED
	/* When statically linked, the _dl_library_path is not yet initialized */
	_dl_library_path = getenv("LD_LIBRARY_PATH");
#endif

	/* Try to load the specified library */
	_dl_if_debug_print("Trying to dlopen '%s', RTLD_GLOBAL:%d RTLD_NOW:%d\n",
			(char*)libname, (flag & RTLD_GLOBAL ? 1:0), (now_flag & RTLD_NOW ? 1:0));
	tpnt = _dl_load_shared_library(0, &rpnt, tfrom, (char*)libname, 0);

	if (tpnt == NULL) {
		_dl_unmap_cache();
		return NULL;
	}
	dyn_chain = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
	_dl_memset(dyn_chain, 0, sizeof(struct dyn_elf));
	dyn_chain->dyn = tpnt;
	tpnt->rtld_flags |= (flag & RTLD_GLOBAL);

	dyn_chain->next_handle = _dl_handles;
	_dl_handles = dyn_ptr = dyn_chain;

	if (tpnt->usage_count > 1) {
		_dl_if_debug_print("Lib: %s already opened\n", libname);
		/* see if there is a handle from a earlier dlopen */
		for (handle = _dl_handles->next_handle; handle; handle = handle->next_handle) {
			if (handle->dyn == tpnt) {
				dyn_chain->init_fini.init_fini = handle->init_fini.init_fini;
				dyn_chain->init_fini.nlist = handle->init_fini.nlist;
				for (i = 0; i < dyn_chain->init_fini.nlist; i++)
					dyn_chain->init_fini.init_fini[i]->rtld_flags |= (flag & RTLD_GLOBAL);
				dyn_chain->next = handle->next;
				break;
			}
		}
		return dyn_chain;
	}

	tpnt->init_flag |= DL_OPENED;

	_dl_if_debug_print("Looking for needed libraries\n");
	nlist = 0;
	runp = alloca(sizeof(*runp));
	runp->tpnt = tpnt;
	runp->next = NULL;
	dep_list = runp2 = runp;
	for (; runp; runp = runp->next)	{
		ElfW(Dyn) *dpnt;
		char *lpntstr;

		nlist++;
		runp->tpnt->init_fini = NULL; /* clear any previous dependcies */
		for (dpnt = (ElfW(Dyn) *) runp->tpnt->dynamic_addr; dpnt->d_tag; dpnt++) {
			if (dpnt->d_tag == DT_NEEDED) {
				lpntstr = (char*) (runp->tpnt->dynamic_info[DT_STRTAB] +
						dpnt->d_un.d_val);
				_dl_if_debug_print("Trying to load '%s', needed by '%s'\n",
						lpntstr, runp->tpnt->libname);
				tpnt1 = _dl_load_shared_library(0, &rpnt, runp->tpnt, lpntstr, 0);
				if (!tpnt1)
					goto oops;

				tpnt1->rtld_flags |= (flag & RTLD_GLOBAL);

				/* This list is for dlsym() and relocation */
				dyn_ptr->next = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
				_dl_memset (dyn_ptr->next, 0, sizeof (struct dyn_elf));
				dyn_ptr = dyn_ptr->next;
				dyn_ptr->dyn = tpnt1;
				/* Used to record RTLD_LOCAL scope */
				tmp = alloca(sizeof(struct init_fini_list));
				tmp->tpnt = tpnt1;
				tmp->next = runp->tpnt->init_fini;
				runp->tpnt->init_fini = tmp;

				for (tmp=dep_list; tmp; tmp = tmp->next) {
					if (tpnt1 == tmp->tpnt) { /* if match => cirular dependency, drop it */
						_dl_if_debug_print("Circular dependency, skipping '%s',\n",
								   tmp->tpnt->libname);
						tpnt1->usage_count--;
						break;
					}
				}
				if (!tmp) { /* Don't add if circular dependency detected */
					runp2->next = alloca(sizeof(*runp));
					runp2 = runp2->next;
					runp2->tpnt = tpnt1;
					runp2->next = NULL;
				}
			}
		}
	}
	init_fini_list = malloc(nlist * sizeof(struct elf_resolve *));
	dyn_chain->init_fini.init_fini = init_fini_list;
	dyn_chain->init_fini.nlist = nlist;
	i = 0;
	for (runp2 = dep_list; runp2; runp2 = runp2->next) {
		init_fini_list[i++] = runp2->tpnt;
		for (runp = runp2->tpnt->init_fini; runp; runp = runp->next) {
			if (!(runp->tpnt->rtld_flags & RTLD_GLOBAL)) {
				tmp = malloc(sizeof(struct init_fini_list));
				tmp->tpnt = runp->tpnt;
				tmp->next = runp2->tpnt->rtld_local;
				runp2->tpnt->rtld_local = tmp;
			}
		}

	}
	/* Build the local scope for the dynamically loaded modules. */
	local_scope = _dl_malloc(nlist * sizeof(struct elf_resolve *)); /* Could it allocated on stack? */
	for (i = 0; i < nlist; i++)
		if (init_fini_list[i]->symbol_scope.r_nlist == 0) {
			int k, cnt;
			cnt = _dl_build_local_scope(local_scope, init_fini_list[i]);
			init_fini_list[i]->symbol_scope.r_list = _dl_malloc(cnt * sizeof(struct elf_resolve *));
			init_fini_list[i]->symbol_scope.r_nlist = cnt;
			_dl_memcpy (init_fini_list[i]->symbol_scope.r_list, local_scope,
					cnt * sizeof (struct elf_resolve *));
			/* Restoring the init_flag.*/
			for (k = 0; k < nlist; k++)
				init_fini_list[k]->init_flag &= ~DL_RESERVED;
		}

	_dl_free(local_scope);

	/* Sort the INIT/FINI list in dependency order. */
	for (runp2 = dep_list; runp2; runp2 = runp2->next) {
		unsigned int j, k;
		for (j = 0; init_fini_list[j] != runp2->tpnt; ++j)
			/* Empty */;
		for (k = j + 1; k < nlist; ++k) {
			struct init_fini_list *ele = init_fini_list[k]->init_fini;

			for (; ele; ele = ele->next) {
				if (ele->tpnt == runp2->tpnt) {
					struct elf_resolve *here = init_fini_list[k];
					_dl_if_debug_print("Move %s from pos %d to %d in INIT/FINI list.\n", here->libname, k, j);
					for (i = (k - j); i; --i)
						init_fini_list[i+j] = init_fini_list[i+j-1];
					init_fini_list[j] = here;
					++j;
					break;
				}
			}
		}
	}
#ifdef __SUPPORT_LD_DEBUG__
	if (_dl_debug) {
		fprintf(stderr, "\nINIT/FINI order and dependencies:\n");
		for (i = 0; i < nlist; i++) {
			fprintf(stderr, "lib: %s has deps:\n", init_fini_list[i]->libname);
			runp = init_fini_list[i]->init_fini;
			for (; runp; runp = runp->next)
				fprintf(stderr, " %s ", runp->tpnt->libname);
			fprintf(stderr, "\n");
		}
	}
#endif

	_dl_if_debug_print("Beginning dlopen relocation fixups\n");
	/*
	 * OK, now all of the kids are tucked into bed in their proper addresses.
	 * Now we go through and look for REL and RELA records that indicate fixups
	 * to the GOT tables.  We need to do this in reverse order so that COPY
	 * directives work correctly */
#ifdef __mips__
	/*
	 * Relocation of the GOT entries for MIPS have to be done
	 * after all the libraries have been loaded.
	 */
	_dl_perform_mips_global_got_relocations(tpnt, !now_flag);
#endif
	/* Get the tail of the list */
	for (ls = &_dl_loaded_modules->symbol_scope; ls && ls->next; ls = ls->next);

	/* Extend the global scope by adding the local scope of the dlopened DSO. */
	ls->next = &dyn_chain->dyn->symbol_scope;

	if (_dl_fixup(dyn_chain, &_dl_loaded_modules->symbol_scope, now_flag))
		goto oops;

	if (relro_ptr) {
		for (rpnt = relro_ptr->next; rpnt; rpnt = rpnt->next) {
			if (rpnt->dyn->relro_size)
				_dl_protect_relro(rpnt->dyn);
		}
	}
	/* TODO:  Should we set the protections of all pages back to R/O now ? */


#if defined(USE_TLS) && USE_TLS

	for (i=0; i < nlist; i++) {
		struct elf_resolve *tmp_tpnt = init_fini_list[i];
		/* Only add TLS memory if this object is loaded now and
		   therefore is not yet initialized.  */

		if (!(tmp_tpnt->init_flag & INIT_FUNCS_CALLED)
		/* Only if the module defines thread local data. */
			&& __builtin_expect (tmp_tpnt->l_tls_blocksize > 0, 0)) {

			/* Now that we know the object is loaded successfully add
			modules containing TLS data to the slot info table.  We
			might have to increase its size.  */
			_dl_add_to_slotinfo ((struct link_map*)tmp_tpnt);

			/* It is the case in which we couldn't perform TLS static
			   initialization at relocation time, and we delayed it until
			   the relocation has been completed. */

			if (tmp_tpnt->l_need_tls_init) {
				tmp_tpnt->l_need_tls_init = 0;
# ifdef SHARED
				/* Update the slot information data for at least the
				generation of the DSO we are allocating data for.  */
				_dl_update_slotinfo (tmp_tpnt->l_tls_modid);
# endif

				_dl_init_static_tls((struct link_map*)tmp_tpnt);
				_dl_assert (tmp_tpnt->l_need_tls_init == 0);
		}

		/* We have to bump the generation counter. */
		any_tls = true;
		}
	}

	/* Bump the generation number if necessary.  */
	if (any_tls && __builtin_expect (++_dl_tls_generation == 0, 0)) {
		_dl_debug_early("TLS generation counter wrapped! Please report this.");
		_dl_exit(30);
	}

#endif

	/* Notify the debugger we have added some objects. */
	if (_dl_debug_addr) {
		dl_brk = (void (*)(void)) _dl_debug_addr->r_brk;
		if (dl_brk != NULL) {
			_dl_debug_addr->r_state = RT_ADD;
			(*dl_brk) ();

			_dl_debug_addr->r_state = RT_CONSISTENT;
			(*dl_brk) ();
		}
	}

	/* Run the ctors and setup the dtors */
	for (i = nlist; i; --i) {
		tpnt = init_fini_list[i-1];
		if (tpnt->init_flag & INIT_FUNCS_CALLED)
			continue;
		tpnt->init_flag |= INIT_FUNCS_CALLED;

		if (tpnt->dynamic_info[DT_INIT]) {
			void (*dl_elf_func) (void);
			dl_elf_func = (void (*)(void)) DL_RELOC_ADDR(tpnt->loadaddr, tpnt->dynamic_info[DT_INIT]);
			if (dl_elf_func) {
				_dl_if_debug_print("running ctors for library %s at '%p'\n",
						tpnt->libname, dl_elf_func);
				DL_CALL_FUNC_AT_ADDR (dl_elf_func, tpnt->loadaddr, (void(*)(void)));
			}
		}

		_dl_run_init_array(tpnt);
	}

	_dl_unmap_cache();
	return (void *) dyn_chain;

oops:
	/* Something went wrong.  Clean up and return NULL. */
	_dl_unmap_cache();
	do_dlclose(dyn_chain, 0);
	return NULL;
}

void *dlsym(void *vhandle, const char *name)
{
	struct elf_resolve *tpnt, *tfrom;
	struct dyn_elf *handle;
	ElfW(Addr) from;
	struct dyn_elf *rpnt;
	void *ret;
	struct symbol_ref sym_ref = { NULL, NULL };
	/* Nastiness to support underscore prefixes.  */
#ifdef __UCLIBC_UNDERSCORES__
	char tmp_buf[80];
	char *name2 = tmp_buf;
	size_t nlen = strlen (name) + 1;
	if (nlen + 1 > sizeof (tmp_buf))
		name2 = malloc (nlen + 1);
	if (name2 == 0) {
		_dl_error_number = LD_ERROR_MMAP_FAILED;
		return 0;
	}
	name2[0] = '_';
	memcpy (name2 + 1, name, nlen);
#else
	const char *name2 = name;
#endif
	handle = (struct dyn_elf *) vhandle;

	/* First of all verify that we have a real handle
	   of some kind.  Return NULL if not a valid handle. */

	if (handle == NULL)
		handle = _dl_symbol_tables;
	else if (handle != RTLD_NEXT && handle != _dl_symbol_tables) {
		for (rpnt = _dl_handles; rpnt; rpnt = rpnt->next_handle)
			if (rpnt == handle)
				break;
		if (!rpnt) {
			_dl_error_number = LD_BAD_HANDLE;
			ret = NULL;
			goto out;
		}
	} else if (handle == RTLD_NEXT) {
		/*
		 * Try and locate the module we were called from - we
		 * need this so that we know where to start searching
		 * from.  We never pass RTLD_NEXT down into the actual
		 * dynamic loader itself, as it doesn't know
		 * how to properly treat it.
		 */
		from = (ElfW(Addr)) __builtin_return_address(0);

		tfrom = NULL;
		for (rpnt = _dl_symbol_tables; rpnt; rpnt = rpnt->next) {
			tpnt = rpnt->dyn;
			if (DL_ADDR_IN_LOADADDR(from, tpnt, tfrom)) {
				tfrom = tpnt;
				handle = rpnt->next;
			}
		}
	}
	tpnt = NULL;
	if (handle == _dl_symbol_tables)
		tpnt = handle->dyn; /* Only search RTLD_GLOBAL objs if global object */
	ret = _dl_find_hash(name2, &handle->dyn->symbol_scope, tpnt, 0, &sym_ref);

#if defined(USE_TLS) && USE_TLS && defined SHARED
	if (sym_ref.sym && (ELF_ST_TYPE(sym_ref.sym->st_info) == STT_TLS) && (sym_ref.tpnt)) {
		/* The found symbol is a thread-local storage variable.
		Return the address for to the current thread.  */
		ret = _dl_tls_symaddr ((struct link_map *)sym_ref.tpnt, (Elf32_Addr)ret);
	}
#endif

	/*
	 * Nothing found.
	 */
	if (!ret)
		_dl_error_number = LD_NO_SYMBOL;
out:
#ifdef __UCLIBC_UNDERSCORES__
	if (name2 != tmp_buf)
		free (name2);
#endif
	return ret;
}

#if 0
void *dlvsym(void *vhandle, const char *name, const char *version)
{
	return dlsym(vhandle, name);
}
#endif

static int do_dlclose(void *vhandle, int need_fini)
{
	struct dyn_elf *rpnt, *rpnt1, *rpnt1_tmp;
	struct init_fini_list *runp, *tmp;
	ElfW(Phdr) *ppnt;
	struct elf_resolve *tpnt, *run_tpnt;
	int (*dl_elf_fini) (void);
	void (*dl_brk) (void);
	struct dyn_elf *handle;
	unsigned int end;
	unsigned int i, j;
	struct r_scope_elem *ls;
#if defined(USE_TLS) && USE_TLS
	bool any_tls = false;
	size_t tls_free_start = NO_TLS_OFFSET;
	size_t tls_free_end = NO_TLS_OFFSET;
	struct link_map *tls_lmap;
#endif

	handle = (struct dyn_elf *) vhandle;
	if (handle == _dl_symbol_tables)
		return 0;
	rpnt1 = NULL;
	for (rpnt = _dl_handles; rpnt; rpnt = rpnt->next_handle) {
		if (rpnt == handle)
			break;
		rpnt1 = rpnt;
	}

	if (!rpnt) {
		_dl_error_number = LD_BAD_HANDLE;
		return 1;
	}
	if (rpnt1)
		rpnt1->next_handle = rpnt->next_handle;
	else
		_dl_handles = rpnt->next_handle;
	_dl_if_debug_print("%s: usage count: %d\n",
			handle->dyn->libname, handle->dyn->usage_count);
	if (handle->dyn->usage_count != 1 || (handle->dyn->rtld_flags & RTLD_NODELETE)) {
		handle->dyn->usage_count--;
		free(handle);
		return 0;
	}
	/* OK, this is a valid handle - now close out the file */
	for (j = 0; j < handle->init_fini.nlist; ++j) {
		tpnt = handle->init_fini.init_fini[j];
		tpnt->usage_count--;
		if (tpnt->usage_count == 0 && !(tpnt->rtld_flags & RTLD_NODELETE)) {
			if ((tpnt->dynamic_info[DT_FINI]
			     || tpnt->dynamic_info[DT_FINI_ARRAY])
			 && need_fini
			 && !(tpnt->init_flag & FINI_FUNCS_CALLED)
			) {
				tpnt->init_flag |= FINI_FUNCS_CALLED;
				_dl_run_fini_array(tpnt);

				if (tpnt->dynamic_info[DT_FINI]) {
					dl_elf_fini = (int (*)(void)) DL_RELOC_ADDR(tpnt->loadaddr, tpnt->dynamic_info[DT_FINI]);
					_dl_if_debug_print("running dtors for library %s at '%p'\n",
							tpnt->libname, dl_elf_fini);
					DL_CALL_FUNC_AT_ADDR (dl_elf_fini, tpnt->loadaddr, (int (*)(void)));
				}
			}

			_dl_if_debug_print("unmapping: %s\n", tpnt->libname);
			end = 0;
			for (i = 0, ppnt = tpnt->ppnt;
					i < tpnt->n_phent; ppnt++, i++) {
				if (ppnt->p_type != PT_LOAD)
					continue;
				if (end < ppnt->p_vaddr + ppnt->p_memsz)
					end = ppnt->p_vaddr + ppnt->p_memsz;
			}

#if defined(USE_TLS) && USE_TLS
			/* Do the cast to make things easy. */
			tls_lmap = (struct link_map *) tpnt;

			/* Remove the object from the dtv slotinfo array if it uses TLS. */
			if (__builtin_expect (tls_lmap->l_tls_blocksize > 0, 0)) {
				any_tls = true;

				if (_dl_tls_dtv_slotinfo_list != NULL
						&& ! remove_slotinfo (tls_lmap->l_tls_modid,
						_dl_tls_dtv_slotinfo_list, 0,
						(tpnt->init_flag & INIT_FUNCS_CALLED)))
					/* All dynamically loaded modules with TLS are unloaded. */
					_dl_tls_max_dtv_idx = _dl_tls_static_nelem;

				if (tls_lmap->l_tls_offset != NO_TLS_OFFSET) {
					/*
					 * Collect a contiguous chunk built from the objects in
					 * this search list, going in either direction.  When the
					 * whole chunk is at the end of the used area then we can
					 * reclaim it.
					 */
# if defined(TLS_TCB_AT_TP)
					if (tls_free_start == NO_TLS_OFFSET
						|| (size_t) tls_lmap->l_tls_offset == tls_free_start) {
						/* Extend the contiguous chunk being reclaimed. */
						tls_free_start
							= tls_lmap->l_tls_offset -
							  tls_lmap->l_tls_blocksize;

						if (tls_free_end == NO_TLS_OFFSET)
							tls_free_end = tls_lmap->l_tls_offset;
					} else if (tls_lmap->l_tls_offset - tls_lmap->l_tls_blocksize
							== tls_free_end)
						/* Extend the chunk backwards.  */
						tls_free_end = tls_lmap->l_tls_offset;
					else {
						/*
						 * This isn't contiguous with the last chunk freed.
						 * One of them will be leaked unless we can free
						 * one block right away.
						 */
						if (tls_free_end == _dl_tls_static_used) {
							_dl_tls_static_used = tls_free_start;
							tls_free_end = tls_lmap->l_tls_offset;
							tls_free_start
								= tls_free_end - tls_lmap->l_tls_blocksize;
						} else if ((size_t) tls_lmap->l_tls_offset
								== _dl_tls_static_used)
							_dl_tls_static_used = tls_lmap->l_tls_offset -
								tls_lmap->l_tls_blocksize;
						else if (tls_free_end < (size_t) tls_lmap->l_tls_offset) {
							/*
							 * We pick the later block. It has a chance
							 * to be freed.
							 */
							tls_free_end = tls_lmap->l_tls_offset;
							tls_free_start = tls_free_end -
								tls_lmap->l_tls_blocksize;
						}
					}
# elif defined(TLS_DTV_AT_TP)
					if ((size_t) tls_lmap->l_tls_offset == tls_free_end)
						/* Extend the contiguous chunk being reclaimed. */
						tls_free_end -= tls_lmap->l_tls_blocksize;
					else if (tls_lmap->l_tls_offset + tls_lmap->l_tls_blocksize
							== tls_free_start)
						/* Extend the chunk backwards. */
						tls_free_start = tls_lmap->l_tls_offset;
					else {
						/*
						 * This isn't contiguous with the last chunk
						 * freed. One of them will be leaked.
						 */
						if (tls_free_end == _dl_tls_static_used)
							_dl_tls_static_used = tls_free_start;
						tls_free_start = tls_lmap->l_tls_offset;
						tls_free_end = tls_free_start +
							tls_lmap->l_tls_blocksize;
					}
# else
#  error Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined
# endif
				} else {

#define TLS_DTV_UNALLOCATED	((void *) -1l)

					dtv_t *dtv = THREAD_DTV ();

					_dl_assert(!(dtv[tls_lmap->l_tls_modid].pointer.is_static));
					if (dtv[tls_lmap->l_tls_modid].pointer.val != TLS_DTV_UNALLOCATED) {
						/* Note that free is called for NULL is well.  We
						deallocate even if it is this dtv entry we are
						supposed to load.  The reason is that we call
						memalign and not malloc.  */
						_dl_free (dtv[tls_lmap->l_tls_modid].pointer.val);
						dtv[tls_lmap->l_tls_modid].pointer.val = TLS_DTV_UNALLOCATED;
					}
				}
			}
#endif

			DL_LIB_UNMAP (tpnt, end - tpnt->mapaddr);
			/* Free elements in RTLD_LOCAL scope list */
			for (runp = tpnt->rtld_local; runp; runp = tmp) {
				tmp = runp->next;
				free(runp);
			}

			/* Next, remove tpnt from the loaded_module list */
			if (_dl_loaded_modules == tpnt) {
				_dl_loaded_modules = tpnt->next;
				if (_dl_loaded_modules)
					_dl_loaded_modules->prev = 0;
			} else {
				for (run_tpnt = _dl_loaded_modules; run_tpnt; run_tpnt = run_tpnt->next) {
					if (run_tpnt->next == tpnt) {
						_dl_if_debug_print("removing loaded_modules: %s\n", tpnt->libname);
						run_tpnt->next = run_tpnt->next->next;
						if (run_tpnt->next)
							run_tpnt->next->prev = run_tpnt;
						break;
					}
				}
			}

			if (handle->dyn == tpnt) {
				/* Unlink the local scope from global one */
				for (ls = &_dl_loaded_modules->symbol_scope; ls; ls = ls->next)
					if (ls->next->r_list[0] == tpnt) {
						_dl_if_debug_print("removing symbol_scope: %s\n", tpnt->libname);
						break;
					}
				ls->next = ls->next->next;
			}

			/* Next, remove tpnt from the global symbol table list */
			if (_dl_symbol_tables) {
				if (_dl_symbol_tables->dyn == tpnt) {
					_dl_symbol_tables = _dl_symbol_tables->next;
					if (_dl_symbol_tables)
						_dl_symbol_tables->prev = 0;
				} else {
					for (rpnt1 = _dl_symbol_tables; rpnt1->next; rpnt1 = rpnt1->next) {
						if (rpnt1->next->dyn == tpnt) {
							_dl_if_debug_print("removing symbol_tables: %s\n", tpnt->libname);
							rpnt1_tmp = rpnt1->next->next;
							free(rpnt1->next);
							rpnt1->next = rpnt1_tmp;
							if (rpnt1->next)
								rpnt1->next->prev = rpnt1;
							break;
						}
					}
				}
			}
			free(tpnt->libname);
			free(tpnt->symbol_scope.r_list);
			free(tpnt);
		}
	}
	for (rpnt1 = handle->next; rpnt1; rpnt1 = rpnt1_tmp) {
		rpnt1_tmp = rpnt1->next;
		free(rpnt1);
	}
	free(handle->init_fini.init_fini);
	free(handle);

#if defined(USE_TLS) && USE_TLS
	/* If we removed any object which uses TLS bump the generation counter.  */
	if (any_tls) {
		if (__builtin_expect(++_dl_tls_generation == 0, 0)) {
			_dl_debug_early("TLS generation counter wrapped!  Please report to the uClibc mailing list.\n");
			_dl_exit(30);
		}

		if (tls_free_end == _dl_tls_static_used)
			_dl_tls_static_used = tls_free_start;
	}
#endif

	if (_dl_debug_addr) {
		dl_brk = (void (*)(void)) _dl_debug_addr->r_brk;
		if (dl_brk != NULL) {
			_dl_debug_addr->r_state = RT_DELETE;
			(*dl_brk) ();

			_dl_debug_addr->r_state = RT_CONSISTENT;
			(*dl_brk) ();
		}
	}

	return 0;
}

int dlclose(void *vhandle)
{
	return do_dlclose(vhandle, 1);
}

char *dlerror(void)
{
	const char *retval;

	if (!_dl_error_number)
		return NULL;
	retval = dl_error_names[_dl_error_number];
	_dl_error_number = 0;
	return (char *)retval;
}

/*
 * Dump information to stderr about the current loaded modules
 */
#ifdef __USE_GNU
static const char type[][4] = { "Lib", "Exe", "Int", "Mod" };

int dlinfo(void)
{
	struct elf_resolve *tpnt;
	struct dyn_elf *rpnt, *hpnt;

	fprintf(stderr, "List of loaded modules\n");
	/* First start with a complete list of all of the loaded files. */
	for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
		fprintf(stderr, "\t%p %p %p %s %d %s\n",
		        DL_LOADADDR_BASE(tpnt->loadaddr), tpnt, tpnt->symbol_scope,
		        type[tpnt->libtype],
		        tpnt->usage_count, tpnt->libname);
	}

	/* Next dump the module list for the application itself */
	fprintf(stderr, "\nModules for application (%p):\n", _dl_symbol_tables);
	for (rpnt = _dl_symbol_tables; rpnt; rpnt = rpnt->next)
		fprintf(stderr, "\t%p %s\n", rpnt->dyn, rpnt->dyn->libname);

	for (hpnt = _dl_handles; hpnt; hpnt = hpnt->next_handle) {
		fprintf(stderr, "Modules for handle %p\n", hpnt);
		for (rpnt = hpnt; rpnt; rpnt = rpnt->next)
			fprintf(stderr, "\t%p %s\n", rpnt->dyn, rpnt->dyn->libname);
	}
	return 0;
}

int dladdr(const void *__address, Dl_info * __info)
{
	struct elf_resolve *pelf;
	struct elf_resolve *rpnt;

	_dl_map_cache();

	/*
	 * Try and locate the module address is in
	 */
	pelf = NULL;

	_dl_if_debug_print("__address: %p  __info: %p\n", __address, __info);

	__address = DL_LOOKUP_ADDRESS (__address);

	for (rpnt = _dl_loaded_modules; rpnt; rpnt = rpnt->next) {
		struct elf_resolve *tpnt;

		tpnt = rpnt;

		_dl_if_debug_print("Module \"%s\" at %p\n",
		                   tpnt->libname, DL_LOADADDR_BASE(tpnt->loadaddr));

		if (DL_ADDR_IN_LOADADDR((ElfW(Addr)) __address, tpnt, pelf))
			pelf = tpnt;
	}

	if (!pelf) {
		return 0;
	}

	/*
	 * Try and locate the symbol of address
	 */

	{
		char *strtab;
		ElfW(Sym) *symtab;
		unsigned int hn, si, sn, sf;
		ElfW(Addr) sa = 0;

		/* Set the info for the object the address lies in */
		__info->dli_fname = pelf->libname;
		__info->dli_fbase = (void *)pelf->mapaddr;

		symtab = (ElfW(Sym) *) (pelf->dynamic_info[DT_SYMTAB]);
		strtab = (char *) (pelf->dynamic_info[DT_STRTAB]);

		sf = sn = 0;

#ifdef __LDSO_GNU_HASH_SUPPORT__
		if (pelf->l_gnu_bitmask) {
			for (hn = 0; hn < pelf->nbucket; hn++) {
				si = pelf->l_gnu_buckets[hn];
				if (!si)
					continue;

				const Elf32_Word *hasharr = &pelf->l_gnu_chain_zero[si];
				do {
					ElfW(Addr) symbol_addr;

					symbol_addr = (ElfW(Addr)) DL_RELOC_ADDR(pelf->loadaddr, symtab[si].st_value);
					if (symbol_addr <= (ElfW(Addr))__address && (!sf || sa < symbol_addr)) {
						sa = symbol_addr;
						sn = si;
						sf = 1;
					}
					_dl_if_debug_print("Symbol \"%s\" at %p\n", strtab + symtab[si].st_name, symbol_addr);
					++si;
				} while ((*hasharr++ & 1u) == 0);
			}
		} else
#endif
		for (hn = 0; hn < pelf->nbucket; hn++) {
			for (si = pelf->elf_buckets[hn]; si; si = pelf->chains[si]) {
				ElfW(Addr) symbol_addr;

				symbol_addr = (ElfW(Addr)) DL_RELOC_ADDR(pelf->loadaddr, symtab[si].st_value);
				if (symbol_addr <= (ElfW(Addr))__address && (!sf || sa < symbol_addr)) {
					sa = symbol_addr;
					sn = si;
					sf = 1;
				}

				_dl_if_debug_print("Symbol \"%s\" at %p\n",
				                   strtab + symtab[si].st_name, symbol_addr);
			}
		}

		if (sf) {
			/* A nearest symbol has been found; fill the entries */
			__info->dli_sname = strtab + symtab[sn].st_name;
			__info->dli_saddr = (void *)sa;
		} else {
			/* No symbol found, fill entries with NULL value,
			only the containing object will be returned. */
			__info->dli_sname = NULL;
			__info->dli_saddr = NULL;
		}
		return 1;
	}
}
#endif