-
Notifications
You must be signed in to change notification settings - Fork 0
/
dln.c
1474 lines (1285 loc) · 31.8 KB
/
dln.c
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
/**********************************************************************
dln.c -
$Author$
created at: Tue Jan 18 17:05:06 JST 1994
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#ifdef RUBY_EXPORT
#include "ruby/ruby.h"
#define dln_notimplement rb_notimplement
#define dln_memerror rb_memerror
#define dln_exit rb_exit
#define dln_loaderror rb_loaderror
#else
#define dln_notimplement --->>> dln not implemented <<<---
#define dln_memerror abort
#define dln_exit exit
static void dln_loaderror(const char *format, ...);
#endif
#include "dln.h"
#include "internal.h"
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#ifdef USE_DLN_A_OUT
char *dln_argv0;
#endif
#if defined(HAVE_ALLOCA_H)
#include <alloca.h>
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
#endif
#ifndef xmalloc
void *xmalloc();
void *xcalloc();
void *xrealloc();
#endif
#undef free
#define free(x) xfree(x)
#include <stdio.h>
#if defined(_WIN32)
#include "missing/file.h"
#endif
#include <sys/types.h>
#include <sys/stat.h>
#ifndef S_ISDIR
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifndef MAXPATHLEN
# define MAXPATHLEN 1024
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifndef _WIN32
char *getenv();
#endif
#ifdef __APPLE__
# if defined(HAVE_DLOPEN)
/* Mac OS X with dlopen (10.3 or later) */
# define MACOSX_DLOPEN
# else
# define MACOSX_DYLD
# endif
#endif
#ifndef dln_loaderror
static void
dln_loaderror(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
abort();
}
#endif
#if defined(HAVE_DLOPEN) && !defined(USE_DLN_A_OUT) && !defined(_AIX) && !defined(MACOSX_DYLD) && !defined(_UNICOSMP)
/* dynamic load with dlopen() */
# define USE_DLN_DLOPEN
#endif
#if defined(__hp9000s300) || ((defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)) && !defined(__ELF__)) || defined(NeXT) || defined(MACOSX_DYLD)
# define EXTERNAL_PREFIX "_"
#else
# define EXTERNAL_PREFIX ""
#endif
#define FUNCNAME_PREFIX EXTERNAL_PREFIX"Init_"
#if defined __CYGWIN__ || defined DOSISH
#define isdirsep(x) ((x) == '/' || (x) == '\\')
#else
#define isdirsep(x) ((x) == '/')
#endif
static size_t
init_funcname_len(const char **file)
{
const char *p = *file, *base, *dot = NULL;
/* Load the file as an object one */
for (base = p; *p; p++) { /* Find position of last '/' */
if (*p == '.' && !dot) dot = p;
if (isdirsep(*p)) base = p+1, dot = NULL;
}
*file = base;
/* Delete suffix if it exists */
return (dot ? dot : p) - base;
}
static const char funcname_prefix[sizeof(FUNCNAME_PREFIX) - 1] = FUNCNAME_PREFIX;
#define init_funcname(buf, file) do {\
const char *base = (file);\
const size_t flen = init_funcname_len(&base);\
const size_t plen = sizeof(funcname_prefix);\
char *const tmp = ALLOCA_N(char, plen+flen+1);\
if (!tmp) {\
dln_memerror();\
}\
memcpy(tmp, funcname_prefix, plen);\
memcpy(tmp+plen, base, flen);\
tmp[plen+flen] = '\0';\
*(buf) = tmp;\
} while (0)
#ifdef USE_DLN_A_OUT
#ifndef LIBC_NAME
# define LIBC_NAME "libc.a"
#endif
#ifndef DLN_DEFAULT_LIB_PATH
# define DLN_DEFAULT_LIB_PATH "/lib:/usr/lib:/usr/local/lib:."
#endif
#include <errno.h>
static int dln_errno;
#define DLN_ENOEXEC ENOEXEC /* Exec format error */
#define DLN_ECONFL 1201 /* Symbol name conflict */
#define DLN_ENOINIT 1202 /* No initializer given */
#define DLN_EUNDEF 1203 /* Undefine symbol remains */
#define DLN_ENOTLIB 1204 /* Not a library file */
#define DLN_EBADLIB 1205 /* Malformed library file */
#define DLN_EINIT 1206 /* Not initialized */
static int dln_init_p = 0;
#include <ar.h>
#include <a.out.h>
#ifndef N_COMM
# define N_COMM 0x12
#endif
#ifndef N_MAGIC
# define N_MAGIC(x) (x).a_magic
#endif
#define INVALID_OBJECT(h) (N_MAGIC(h) != OMAGIC)
#include "ruby/util.h"
#include "ruby/st.h"
static st_table *sym_tbl;
static st_table *undef_tbl;
static int load_lib();
static int
load_header(int fd, struct exec *hdrp, long disp)
{
int size;
lseek(fd, disp, 0);
size = read(fd, hdrp, sizeof(struct exec));
if (size == -1) {
dln_errno = errno;
return -1;
}
if (size != sizeof(struct exec) || N_BADMAG(*hdrp)) {
dln_errno = DLN_ENOEXEC;
return -1;
}
return 0;
}
#if defined(sequent)
#define RELOC_SYMBOL(r) ((r)->r_symbolnum)
#define RELOC_MEMORY_SUB_P(r) ((r)->r_bsr)
#define RELOC_PCREL_P(r) ((r)->r_pcrel || (r)->r_bsr)
#define RELOC_TARGET_SIZE(r) ((r)->r_length)
#endif
/* Default macros */
#ifndef RELOC_ADDRESS
#define RELOC_ADDRESS(r) ((r)->r_address)
#define RELOC_EXTERN_P(r) ((r)->r_extern)
#define RELOC_SYMBOL(r) ((r)->r_symbolnum)
#define RELOC_MEMORY_SUB_P(r) 0
#define RELOC_PCREL_P(r) ((r)->r_pcrel)
#define RELOC_TARGET_SIZE(r) ((r)->r_length)
#endif
#if defined(__sun) && defined(__sparc)
/* Sparc (Sun 4) macros */
# undef relocation_info
# define relocation_info reloc_info_sparc
# define R_RIGHTSHIFT(r) (reloc_r_rightshift[(r)->r_type])
# define R_BITSIZE(r) (reloc_r_bitsize[(r)->r_type])
# define R_LENGTH(r) (reloc_r_length[(r)->r_type])
static const int reloc_r_rightshift[] = {
0, 0, 0, 0, 0, 0, 2, 2, 10, 0, 0, 0, 0, 0, 0,
};
static const int reloc_r_bitsize[] = {
8, 16, 32, 8, 16, 32, 30, 22, 22, 22, 13, 10, 32, 32, 16,
};
static const int reloc_r_length[] = {
0, 1, 2, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
};
# define R_PCREL(r) \
((r)->r_type >= RELOC_DISP8 && (r)->r_type <= RELOC_WDISP22)
# define R_SYMBOL(r) ((r)->r_index)
#endif
#if defined(sequent)
#define R_SYMBOL(r) ((r)->r_symbolnum)
#define R_MEMORY_SUB(r) ((r)->r_bsr)
#define R_PCREL(r) ((r)->r_pcrel || (r)->r_bsr)
#define R_LENGTH(r) ((r)->r_length)
#endif
#ifndef R_SYMBOL
# define R_SYMBOL(r) ((r)->r_symbolnum)
# define R_MEMORY_SUB(r) 0
# define R_PCREL(r) ((r)->r_pcrel)
# define R_LENGTH(r) ((r)->r_length)
#endif
static struct relocation_info *
load_reloc(int fd, struct exec *hdrp, long disp)
{
struct relocation_info *reloc;
int size;
lseek(fd, disp + N_TXTOFF(*hdrp) + hdrp->a_text + hdrp->a_data, 0);
size = hdrp->a_trsize + hdrp->a_drsize;
reloc = (struct relocation_info*)xmalloc(size);
if (reloc == NULL) {
dln_errno = errno;
return NULL;
}
if (read(fd, reloc, size) != size) {
dln_errno = errno;
free(reloc);
return NULL;
}
return reloc;
}
static struct nlist *
load_sym(int fd, struct exec *hdrp, long disp)
{
struct nlist * buffer;
struct nlist * sym;
struct nlist * end;
long displ;
int size;
lseek(fd, N_SYMOFF(*hdrp) + hdrp->a_syms + disp, 0);
if (read(fd, &size, sizeof(int)) != sizeof(int)) {
goto err_noexec;
}
buffer = (struct nlist*)xmalloc(hdrp->a_syms + size);
if (buffer == NULL) {
dln_errno = errno;
return NULL;
}
lseek(fd, disp + N_SYMOFF(*hdrp), 0);
if (read(fd, buffer, hdrp->a_syms + size) != hdrp->a_syms + size) {
free(buffer);
goto err_noexec;
}
sym = buffer;
end = sym + hdrp->a_syms / sizeof(struct nlist);
displ = (long)buffer + (long)(hdrp->a_syms);
while (sym < end) {
sym->n_un.n_name = (char*)sym->n_un.n_strx + displ;
sym++;
}
return buffer;
err_noexec:
dln_errno = DLN_ENOEXEC;
return NULL;
}
static st_table *
sym_hash(struct exec *hdrp, struct nlist *syms)
{
st_table *tbl;
struct nlist *sym = syms;
struct nlist *end = syms + (hdrp->a_syms / sizeof(struct nlist));
tbl = st_init_strtable();
if (tbl == NULL) {
dln_errno = errno;
return NULL;
}
while (sym < end) {
st_insert(tbl, sym->n_un.n_name, sym);
sym++;
}
return tbl;
}
static int
dln_init(const char *prog)
{
char *file, fbuf[MAXPATHLEN];
int fd;
struct exec hdr;
struct nlist *syms;
if (dln_init_p == 1) return 0;
file = dln_find_exe_r(prog, NULL, fbuf, sizeof(fbuf));
if (file == NULL || (fd = open(file, O_RDONLY)) < 0) {
dln_errno = errno;
return -1;
}
if (load_header(fd, &hdr, 0) == -1) return -1;
syms = load_sym(fd, &hdr, 0);
if (syms == NULL) {
close(fd);
return -1;
}
sym_tbl = sym_hash(&hdr, syms);
if (sym_tbl == NULL) { /* file may be start with #! */
char c = '\0';
char buf[MAXPATHLEN];
char *p;
free(syms);
lseek(fd, 0L, 0);
if (read(fd, &c, 1) == -1) {
dln_errno = errno;
return -1;
}
if (c != '#') goto err_noexec;
if (read(fd, &c, 1) == -1) {
dln_errno = errno;
return -1;
}
if (c != '!') goto err_noexec;
p = buf;
/* skip forwarding spaces */
while (read(fd, &c, 1) == 1) {
if (c == '\n') goto err_noexec;
if (c != '\t' && c != ' ') {
*p++ = c;
break;
}
}
/* read in command name */
while (read(fd, p, 1) == 1) {
if (*p == '\n' || *p == '\t' || *p == ' ') break;
p++;
if (p-buf >= MAXPATHLEN) {
dln_errno = ENAMETOOLONG;
return -1;
}
}
*p = '\0';
return dln_init(buf);
}
dln_init_p = 1;
undef_tbl = st_init_strtable();
close(fd);
return 0;
err_noexec:
close(fd);
dln_errno = DLN_ENOEXEC;
return -1;
}
static long
load_text_data(int fd, struct exec *hdrp, int bss, long disp)
{
int size;
unsigned char* addr;
lseek(fd, disp + N_TXTOFF(*hdrp), 0);
size = hdrp->a_text + hdrp->a_data;
if (bss == -1) size += hdrp->a_bss;
else if (bss > 1) size += bss;
addr = (unsigned char*)xmalloc(size);
if (addr == NULL) {
dln_errno = errno;
return 0;
}
if (read(fd, addr, size) != size) {
dln_errno = errno;
free(addr);
return 0;
}
if (bss == -1) {
memset(addr + hdrp->a_text + hdrp->a_data, 0, hdrp->a_bss);
}
else if (bss > 0) {
memset(addr + hdrp->a_text + hdrp->a_data, 0, bss);
}
return (long)addr;
}
static int
undef_print(char *key, char *value)
{
fprintf(stderr, " %s\n", key);
return ST_CONTINUE;
}
static void
dln_print_undef(void)
{
fprintf(stderr, " Undefined symbols:\n");
st_foreach(undef_tbl, undef_print, NULL);
}
static void
dln_undefined(void)
{
if (undef_tbl->num_entries > 0) {
fprintf(stderr, "dln: Calling undefined function\n");
dln_print_undef();
dln_exit(1);
}
}
struct undef {
char *name;
struct relocation_info reloc;
long base;
char *addr;
union {
char c;
short s;
long l;
} u;
};
static st_table *reloc_tbl = NULL;
static void
link_undef(const char *name, long base, struct relocation_info *reloc)
{
static int u_no = 0;
struct undef *obj;
char *addr = (char*)(reloc->r_address + base);
obj = (struct undef*)xmalloc(sizeof(struct undef));
obj->name = strdup(name);
obj->reloc = *reloc;
obj->base = base;
switch (R_LENGTH(reloc)) {
case 0: /* byte */
obj->u.c = *addr;
break;
case 1: /* word */
obj->u.s = *(short*)addr;
break;
case 2: /* long */
obj->u.l = *(long*)addr;
break;
}
if (reloc_tbl == NULL) {
reloc_tbl = st_init_numtable();
}
st_insert(reloc_tbl, u_no++, obj);
}
struct reloc_arg {
const char *name;
long value;
};
static int
reloc_undef(int no, struct undef *undef, struct reloc_arg *arg)
{
int datum;
char *address;
#if defined(__sun) && defined(__sparc)
unsigned int mask = 0;
#endif
if (strcmp(arg->name, undef->name) != 0) return ST_CONTINUE;
address = (char*)(undef->base + undef->reloc.r_address);
datum = arg->value;
if (R_PCREL(&(undef->reloc))) datum -= undef->base;
#if defined(__sun) && defined(__sparc)
datum += undef->reloc.r_addend;
datum >>= R_RIGHTSHIFT(&(undef->reloc));
mask = (1 << R_BITSIZE(&(undef->reloc))) - 1;
mask |= mask -1;
datum &= mask;
switch (R_LENGTH(&(undef->reloc))) {
case 0:
*address = undef->u.c;
*address &= ~mask;
*address |= datum;
break;
case 1:
*(short *)address = undef->u.s;
*(short *)address &= ~mask;
*(short *)address |= datum;
break;
case 2:
*(long *)address = undef->u.l;
*(long *)address &= ~mask;
*(long *)address |= datum;
break;
}
#else
switch (R_LENGTH(&(undef->reloc))) {
case 0: /* byte */
if (R_MEMORY_SUB(&(undef->reloc)))
*address = datum - *address;
else *address = undef->u.c + datum;
break;
case 1: /* word */
if (R_MEMORY_SUB(&(undef->reloc)))
*(short*)address = datum - *(short*)address;
else *(short*)address = undef->u.s + datum;
break;
case 2: /* long */
if (R_MEMORY_SUB(&(undef->reloc)))
*(long*)address = datum - *(long*)address;
else *(long*)address = undef->u.l + datum;
break;
}
#endif
free(undef->name);
free(undef);
return ST_DELETE;
}
static void
unlink_undef(const char *name, long value)
{
struct reloc_arg arg;
arg.name = name;
arg.value = value;
st_foreach(reloc_tbl, reloc_undef, &arg);
}
#ifdef N_INDR
struct indr_data {
char *name0, *name1;
};
static int
reloc_repl(int no, struct undef *undef, struct indr_data *data)
{
if (strcmp(data->name0, undef->name) == 0) {
free(undef->name);
undef->name = strdup(data->name1);
}
return ST_CONTINUE;
}
#endif
static int
load_1(int fd, long disp, const char *need_init)
{
static const char *libc = LIBC_NAME;
struct exec hdr;
struct relocation_info *reloc = NULL;
long block = 0;
long new_common = 0; /* Length of new common */
struct nlist *syms = NULL;
struct nlist *sym;
struct nlist *end;
int init_p = 0;
if (load_header(fd, &hdr, disp) == -1) return -1;
if (INVALID_OBJECT(hdr)) {
dln_errno = DLN_ENOEXEC;
return -1;
}
reloc = load_reloc(fd, &hdr, disp);
if (reloc == NULL) return -1;
syms = load_sym(fd, &hdr, disp);
if (syms == NULL) {
free(reloc);
return -1;
}
sym = syms;
end = syms + (hdr.a_syms / sizeof(struct nlist));
while (sym < end) {
struct nlist *old_sym;
int value = sym->n_value;
#ifdef N_INDR
if (sym->n_type == (N_INDR | N_EXT)) {
char *key = sym->n_un.n_name;
if (st_lookup(sym_tbl, sym[1].n_un.n_name, &old_sym)) {
if (st_delete(undef_tbl, (st_data_t*)&key, NULL)) {
unlink_undef(key, old_sym->n_value);
free(key);
}
}
else {
struct indr_data data;
data.name0 = sym->n_un.n_name;
data.name1 = sym[1].n_un.n_name;
st_foreach(reloc_tbl, reloc_repl, &data);
st_insert(undef_tbl, strdup(sym[1].n_un.n_name), NULL);
if (st_delete(undef_tbl, (st_data_t*)&key, NULL)) {
free(key);
}
}
sym += 2;
continue;
}
#endif
if (sym->n_type == (N_UNDF | N_EXT)) {
if (st_lookup(sym_tbl, sym->n_un.n_name, &old_sym) == 0) {
old_sym = NULL;
}
if (value) {
if (old_sym) {
sym->n_type = N_EXT | N_COMM;
sym->n_value = old_sym->n_value;
}
else {
int rnd =
value >= sizeof(double) ? sizeof(double) - 1
: value >= sizeof(long) ? sizeof(long) - 1
: sizeof(short) - 1;
sym->n_type = N_COMM;
new_common += rnd;
new_common &= ~(long)rnd;
sym->n_value = new_common;
new_common += value;
}
}
else {
if (old_sym) {
sym->n_type = N_EXT | N_COMM;
sym->n_value = old_sym->n_value;
}
else {
sym->n_value = (long)dln_undefined;
st_insert(undef_tbl, strdup(sym->n_un.n_name), NULL);
}
}
}
sym++;
}
block = load_text_data(fd, &hdr, hdr.a_bss + new_common, disp);
if (block == 0) goto err_exit;
sym = syms;
while (sym < end) {
struct nlist *new_sym;
char *key;
switch (sym->n_type) {
case N_COMM:
sym->n_value += hdr.a_text + hdr.a_data;
case N_TEXT|N_EXT:
case N_DATA|N_EXT:
sym->n_value += block;
if (st_lookup(sym_tbl, sym->n_un.n_name, &new_sym) != 0
&& new_sym->n_value != (long)dln_undefined) {
dln_errno = DLN_ECONFL;
goto err_exit;
}
key = sym->n_un.n_name;
if (st_delete(undef_tbl, (st_data_t*)&key, NULL) != 0) {
unlink_undef(key, sym->n_value);
free(key);
}
new_sym = (struct nlist*)xmalloc(sizeof(struct nlist));
*new_sym = *sym;
new_sym->n_un.n_name = strdup(sym->n_un.n_name);
st_insert(sym_tbl, new_sym->n_un.n_name, new_sym);
break;
case N_TEXT:
case N_DATA:
sym->n_value += block;
break;
}
sym++;
}
/*
* First comes the text-relocation
*/
{
struct relocation_info * rel = reloc;
struct relocation_info * rel_beg = reloc +
(hdr.a_trsize/sizeof(struct relocation_info));
struct relocation_info * rel_end = reloc +
(hdr.a_trsize+hdr.a_drsize)/sizeof(struct relocation_info);
while (rel < rel_end) {
char *address = (char*)(rel->r_address + block);
long datum = 0;
#if defined(__sun) && defined(__sparc)
unsigned int mask = 0;
#endif
if (rel >= rel_beg)
address += hdr.a_text;
if (rel->r_extern) { /* Look it up in symbol-table */
sym = &(syms[R_SYMBOL(rel)]);
switch (sym->n_type) {
case N_EXT|N_UNDF:
link_undef(sym->n_un.n_name, block, rel);
case N_EXT|N_COMM:
case N_COMM:
datum = sym->n_value;
break;
default:
goto err_exit;
}
} /* end.. look it up */
else { /* is static */
switch (R_SYMBOL(rel)) {
case N_TEXT:
case N_DATA:
datum = block;
break;
case N_BSS:
datum = block + new_common;
break;
case N_ABS:
break;
}
} /* end .. is static */
if (R_PCREL(rel)) datum -= block;
#if defined(__sun) && defined(__sparc)
datum += rel->r_addend;
datum >>= R_RIGHTSHIFT(rel);
mask = (1 << R_BITSIZE(rel)) - 1;
mask |= mask -1;
datum &= mask;
switch (R_LENGTH(rel)) {
case 0:
*address &= ~mask;
*address |= datum;
break;
case 1:
*(short *)address &= ~mask;
*(short *)address |= datum;
break;
case 2:
*(long *)address &= ~mask;
*(long *)address |= datum;
break;
}
#else
switch (R_LENGTH(rel)) {
case 0: /* byte */
if (datum < -128 || datum > 127) goto err_exit;
*address += datum;
break;
case 1: /* word */
*(short *)address += datum;
break;
case 2: /* long */
*(long *)address += datum;
break;
}
#endif
rel++;
}
}
if (need_init) {
int len;
char **libs_to_be_linked = 0;
char *buf;
if (undef_tbl->num_entries > 0) {
if (load_lib(libc) == -1) goto err_exit;
}
init_funcname(&buf, need_init);
len = strlen(buf);
for (sym = syms; sym<end; sym++) {
char *name = sym->n_un.n_name;
if (name[0] == '_' && sym->n_value >= block) {
if (strcmp(name+1, "dln_libs_to_be_linked") == 0) {
libs_to_be_linked = (char**)sym->n_value;
}
else if (strcmp(name+1, buf) == 0) {
init_p = 1;
((int (*)())sym->n_value)();
}
}
}
if (libs_to_be_linked && undef_tbl->num_entries > 0) {
while (*libs_to_be_linked) {
load_lib(*libs_to_be_linked);
libs_to_be_linked++;
}
}
}
free(reloc);
free(syms);
if (need_init) {
if (init_p == 0) {
dln_errno = DLN_ENOINIT;
return -1;
}
if (undef_tbl->num_entries > 0) {
if (load_lib(libc) == -1) goto err_exit;
if (undef_tbl->num_entries > 0) {
dln_errno = DLN_EUNDEF;
return -1;
}
}
}
return 0;
err_exit:
if (syms) free(syms);
if (reloc) free(reloc);
if (block) free((char*)block);
return -1;
}
static int target_offset;
static int
search_undef(const char *key, int value, st_table *lib_tbl)
{
long offset;
if (st_lookup(lib_tbl, key, &offset) == 0) return ST_CONTINUE;
target_offset = offset;
return ST_STOP;
}
struct symdef {
int rb_str_index;
int lib_offset;
};
const char *dln_librrb_ary_path = DLN_DEFAULT_LIB_PATH;
static int
load_lib(const char *lib)
{
char *path, *file, fbuf[MAXPATHLEN];
char *envpath = 0;
char armagic[SARMAG];
int fd, size;
struct ar_hdr ahdr;
st_table *lib_tbl = NULL;
int *data, nsym;
struct symdef *base;
char *name_base;
if (dln_init_p == 0) {
dln_errno = DLN_ENOINIT;
return -1;
}
if (undef_tbl->num_entries == 0) return 0;
dln_errno = DLN_EBADLIB;
if (lib[0] == '-' && lib[1] == 'l') {
long len = strlen(lib) + 4;
char *p = alloca(len);
snprintf(p, len, "lib%s.a", lib+2);
lib = p;
}
/* library search path: */
/* look for environment variable DLN_LIBRARY_PATH first. */
/* then variable dln_librrb_ary_path. */
/* if path is still NULL, use "." for path. */
path = getenv("DLN_LIBRARY_PATH");
if (path == NULL) path = dln_librrb_ary_path;
else path = envpath = strdup(path);
file = dln_find_file_r(lib, path, fbuf, sizeof(fbuf));
if (envpath) free(envpath);
fd = open(file, O_RDONLY);
if (fd == -1) goto syserr;
size = read(fd, armagic, SARMAG);
if (size == -1) goto syserr;
if (size != SARMAG) {
dln_errno = DLN_ENOTLIB;
goto badlib;
}
size = read(fd, &ahdr, sizeof(ahdr));
if (size == -1) goto syserr;
if (size != sizeof(ahdr) || sscanf(ahdr.ar_size, "%d", &size) != 1) {
goto badlib;
}
if (strncmp(ahdr.ar_name, "__.SYMDEF", 9) == 0) {
/* make hash table from __.SYMDEF */
lib_tbl = st_init_strtable();
data = (int*)xmalloc(size);
if (data == NULL) goto syserr;
size = read(fd, data, size);
nsym = *data / sizeof(struct symdef);
base = (struct symdef*)(data + 1);
name_base = (char*)(base + nsym) + sizeof(int);
while (nsym > 0) {
char *name = name_base + base->rb_str_index;
st_insert(lib_tbl, name, base->lib_offset + sizeof(ahdr));
nsym--;
base++;
}
for (;;) {
target_offset = -1;
st_foreach(undef_tbl, search_undef, lib_tbl);
if (target_offset == -1) break;
if (load_1(fd, target_offset, 0) == -1) {
st_free_table(lib_tbl);
free(data);
goto badlib;
}
if (undef_tbl->num_entries == 0) break;
}
free(data);
st_free_table(lib_tbl);
}
else {
/* linear library, need to scan (FUTURE) */
for (;;) {
int offset = SARMAG;
int found = 0;
struct exec hdr;