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
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
|
/* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000, 2001,
2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
/*
In other words, you are welcome to use, share and improve this program.
You are forbidden to forbid anyone else to use, share and improve
what you give them. Help stamp out software-hoarding! */
/*
* unexec.c - Convert a running program into an a.out file.
*
* Author: Spencer W. Thomas
* Computer Science Dept.
* University of Utah
* Date: Tue Mar 2 1982
* Modified heavily since then.
*
* Synopsis:
* unexec (new_name, old_name, data_start, bss_start, entry_address)
* char *new_name, *old_name;
* unsigned data_start, bss_start, entry_address;
*
* Takes a snapshot of the program and makes an a.out format file in the
* file named by the string argument new_name.
* If old_name is non-NULL, the symbol table will be taken from the given file.
* On some machines, an existing old_name file is required.
*
* The boundaries within the a.out file may be adjusted with the data_start
* and bss_start arguments. Either or both may be given as 0 for defaults.
*
* Data_start gives the boundary between the text segment and the data
* segment of the program. The text segment can contain shared, read-only
* program code and literal data, while the data segment is always unshared
* and unprotected. Data_start gives the lowest unprotected address.
* The value you specify may be rounded down to a suitable boundary
* as required by the machine you are using.
*
* Bss_start indicates how much of the data segment is to be saved in the
* a.out file and restored when the program is executed. It gives the lowest
* unsaved address, and is rounded up to a page boundary. The default when 0
* is given assumes that the entire data segment is to be stored, including
* the previous data and bss as well as any additional storage allocated with
* break (2).
*
* The new file is set up to start at entry_address.
*
*/
/* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
* ELF support added.
*
* Basic theory: the data space of the running process needs to be
* dumped to the output file. Normally we would just enlarge the size
* of .data, scooting everything down. But we can't do that in ELF,
* because there is often something between the .data space and the
* .bss space.
*
* In the temacs dump below, notice that the Global Offset Table
* (.got) and the Dynamic link data (.dynamic) come between .data1 and
* .bss. It does not work to overlap .data with these fields.
*
* The solution is to create a new .data segment. This segment is
* filled with data from the current process. Since the contents of
* various sections refer to sections by index, the new .data segment
* is made the last in the table to avoid changing any existing index.
* This is an example of how the section headers are changed. "Addr"
* is a process virtual address. "Offset" is a file offset.
raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
temacs:
**** SECTION HEADER TABLE ****
[No] Type Flags Addr Offset Size Name
Link Info Adralgn Entsize
[1] 1 2 0x80480d4 0xd4 0x13 .interp
0 0 0x1 0
[2] 5 2 0x80480e8 0xe8 0x388 .hash
3 0 0x4 0x4
[3] 11 2 0x8048470 0x470 0x7f0 .dynsym
4 1 0x4 0x10
[4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
0 0 0x1 0
[5] 9 2 0x8049010 0x1010 0x338 .rel.plt
3 7 0x4 0x8
[6] 1 6 0x8049348 0x1348 0x3 .init
0 0 0x4 0
[7] 1 6 0x804934c 0x134c 0x680 .plt
0 0 0x4 0x4
[8] 1 6 0x80499cc 0x19cc 0x3c56f .text
0 0 0x4 0
[9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
0 0 0x4 0
[10] 1 2 0x8085f40 0x3df40 0x69c .rodata
0 0 0x4 0
[11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
0 0 0x4 0
[12] 1 3 0x8088330 0x3f330 0x20afc .data
0 0 0x4 0
[13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
0 0 0x4 0
[14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
0 0 0x4 0x4
[15] 6 3 0x80a9874 0x60874 0x80 .dynamic
4 0 0x4 0x8
[16] 8 3 0x80a98f4 0x608f4 0x449c .bss
0 0 0x4 0
[17] 2 0 0 0x608f4 0x9b90 .symtab
18 371 0x4 0x10
[18] 3 0 0 0x6a484 0x8526 .strtab
0 0 0x1 0
[19] 3 0 0 0x729aa 0x93 .shstrtab
0 0 0x1 0
[20] 1 0 0 0x72a3d 0x68b7 .comment
0 0 0x1 0
raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
xemacs:
**** SECTION HEADER TABLE ****
[No] Type Flags Addr Offset Size Name
Link Info Adralgn Entsize
[1] 1 2 0x80480d4 0xd4 0x13 .interp
0 0 0x1 0
[2] 5 2 0x80480e8 0xe8 0x388 .hash
3 0 0x4 0x4
[3] 11 2 0x8048470 0x470 0x7f0 .dynsym
4 1 0x4 0x10
[4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
0 0 0x1 0
[5] 9 2 0x8049010 0x1010 0x338 .rel.plt
3 7 0x4 0x8
[6] 1 6 0x8049348 0x1348 0x3 .init
0 0 0x4 0
[7] 1 6 0x804934c 0x134c 0x680 .plt
0 0 0x4 0x4
[8] 1 6 0x80499cc 0x19cc 0x3c56f .text
0 0 0x4 0
[9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
0 0 0x4 0
[10] 1 2 0x8085f40 0x3df40 0x69c .rodata
0 0 0x4 0
[11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
0 0 0x4 0
[12] 1 3 0x8088330 0x3f330 0x20afc .data
0 0 0x4 0
[13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
0 0 0x4 0
[14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
0 0 0x4 0x4
[15] 6 3 0x80a9874 0x60874 0x80 .dynamic
4 0 0x4 0x8
[16] 8 3 0x80c6800 0x7d800 0 .bss
0 0 0x4 0
[17] 2 0 0 0x7d800 0x9b90 .symtab
18 371 0x4 0x10
[18] 3 0 0 0x87390 0x8526 .strtab
0 0 0x1 0
[19] 3 0 0 0x8f8b6 0x93 .shstrtab
0 0 0x1 0
[20] 1 0 0 0x8f949 0x68b7 .comment
0 0 0x1 0
[21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
0 0 0x4 0
* This is an example of how the file header is changed. "Shoff" is
* the section header offset within the file. Since that table is
* after the new .data section, it is moved. "Shnum" is the number of
* sections, which we increment.
*
* "Phoff" is the file offset to the program header. "Phentsize" and
* "Shentsz" are the program and section header entries sizes respectively.
* These can be larger than the apparent struct sizes.
raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
temacs:
**** ELF HEADER ****
Class Data Type Machine Version
Entry Phoff Shoff Flags Ehsize
Phentsize Phnum Shentsz Shnum Shstrndx
1 1 2 3 1
0x80499cc 0x34 0x792f4 0 0x34
0x20 5 0x28 21 19
raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
xemacs:
**** ELF HEADER ****
Class Data Type Machine Version
Entry Phoff Shoff Flags Ehsize
Phentsize Phnum Shentsz Shnum Shstrndx
1 1 2 3 1
0x80499cc 0x34 0x96200 0 0x34
0x20 5 0x28 22 19
* These are the program headers. "Offset" is the file offset to the
* segment. "Vaddr" is the memory load address. "Filesz" is the
* segment size as it appears in the file, and "Memsz" is the size in
* memory. Below, the third segment is the code and the fourth is the
* data: the difference between Filesz and Memsz is .bss
raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
temacs:
***** PROGRAM EXECUTION HEADER *****
Type Offset Vaddr Paddr
Filesz Memsz Flags Align
6 0x34 0x8048034 0
0xa0 0xa0 5 0
3 0xd4 0 0
0x13 0 4 0
1 0x34 0x8048034 0
0x3f2f9 0x3f2f9 5 0x1000
1 0x3f330 0x8088330 0
0x215c4 0x25a60 7 0x1000
2 0x60874 0x80a9874 0
0x80 0 7 0
raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
xemacs:
***** PROGRAM EXECUTION HEADER *****
Type Offset Vaddr Paddr
Filesz Memsz Flags Align
6 0x34 0x8048034 0
0xa0 0xa0 5 0
3 0xd4 0 0
0x13 0 4 0
1 0x34 0x8048034 0
0x3f2f9 0x3f2f9 5 0x1000
1 0x3f330 0x8088330 0
0x3e4d0 0x3e4d0 7 0x1000
2 0x60874 0x80a9874 0
0x80 0 7 0
*/
/* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
*
* The above mechanism does not work if the unexeced ELF file is being
* re-layout by other applications (such as `strip'). All the applications
* that re-layout the internal of ELF will layout all sections in ascending
* order of their file offsets. After the re-layout, the data2 section will
* still be the LAST section in the section header vector, but its file offset
* is now being pushed far away down, and causes part of it not to be mapped
* in (ie. not covered by the load segment entry in PHDR vector), therefore
* causes the new binary to fail.
*
* The solution is to modify the unexec algorithm to insert the new data2
* section header right before the new bss section header, so their file
* offsets will be in the ascending order. Since some of the section's (all
* sections AFTER the bss section) indexes are now changed, we also need to
* modify some fields to make them point to the right sections. This is done
* by macro PATCH_INDEX. All the fields that need to be patched are:
*
* 1. ELF header e_shstrndx field.
* 2. section header sh_link and sh_info field.
* 3. symbol table entry st_shndx field.
*
* The above example now should look like:
**** SECTION HEADER TABLE ****
[No] Type Flags Addr Offset Size Name
Link Info Adralgn Entsize
[1] 1 2 0x80480d4 0xd4 0x13 .interp
0 0 0x1 0
[2] 5 2 0x80480e8 0xe8 0x388 .hash
3 0 0x4 0x4
[3] 11 2 0x8048470 0x470 0x7f0 .dynsym
4 1 0x4 0x10
[4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
0 0 0x1 0
[5] 9 2 0x8049010 0x1010 0x338 .rel.plt
3 7 0x4 0x8
[6] 1 6 0x8049348 0x1348 0x3 .init
0 0 0x4 0
[7] 1 6 0x804934c 0x134c 0x680 .plt
0 0 0x4 0x4
[8] 1 6 0x80499cc 0x19cc 0x3c56f .text
0 0 0x4 0
[9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
0 0 0x4 0
[10] 1 2 0x8085f40 0x3df40 0x69c .rodata
0 0 0x4 0
[11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
0 0 0x4 0
[12] 1 3 0x8088330 0x3f330 0x20afc .data
0 0 0x4 0
[13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
0 0 0x4 0
[14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
0 0 0x4 0x4
[15] 6 3 0x80a9874 0x60874 0x80 .dynamic
4 0 0x4 0x8
[16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
0 0 0x4 0
[17] 8 3 0x80c6800 0x7d800 0 .bss
0 0 0x4 0
[18] 2 0 0 0x7d800 0x9b90 .symtab
19 371 0x4 0x10
[19] 3 0 0 0x87390 0x8526 .strtab
0 0 0x1 0
[20] 3 0 0 0x8f8b6 0x93 .shstrtab
0 0 0x1 0
[21] 1 0 0 0x8f949 0x68b7 .comment
0 0 0x1 0
*/
/* We do not use mmap because that fails with NFS.
Instead we read the whole file, modify it, and write it out. */
#ifndef emacs
#define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
#include <string.h>
#else
#include <config.h>
extern void fatal (const char *msgid, ...);
#endif
#include <sys/types.h>
#include <stdio.h>
#include <sys/stat.h>
#include <memory.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#if !defined (__NetBSD__) && !defined (__OpenBSD__)
#include <elf.h>
#endif
#include <sys/mman.h>
#if defined (_SYSTYPE_SYSV)
#include <sys/elf_mips.h>
#include <sym.h>
#endif /* _SYSTYPE_SYSV */
#if __sgi
#include <syms.h> /* for HDRR declaration */
#endif /* __sgi */
#ifndef MAP_ANON
#ifdef MAP_ANONYMOUS
#define MAP_ANON MAP_ANONYMOUS
#else
#define MAP_ANON 0
#endif
#endif
#ifndef MAP_FAILED
#define MAP_FAILED ((void *) -1)
#endif
#if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__)
/* Declare COFF debugging symbol table. This used to be in
/usr/include/sym.h, but this file is no longer included in Red Hat
5.0 and presumably in any other glibc 2.x based distribution. */
typedef struct {
short magic;
short vstamp;
int ilineMax;
int idnMax;
int ipdMax;
int isymMax;
int ioptMax;
int iauxMax;
int issMax;
int issExtMax;
int ifdMax;
int crfd;
int iextMax;
long cbLine;
long cbLineOffset;
long cbDnOffset;
long cbPdOffset;
long cbSymOffset;
long cbOptOffset;
long cbAuxOffset;
long cbSsOffset;
long cbSsExtOffset;
long cbFdOffset;
long cbRfdOffset;
long cbExtOffset;
} HDRR, *pHDRR;
#define cbHDRR sizeof(HDRR)
#define hdrNil ((pHDRR)0)
#endif
#ifdef __NetBSD__
/*
* NetBSD does not have normal-looking user-land ELF support.
*/
# if defined __alpha__ || defined __sparc_v9__
# define ELFSIZE 64
# else
# define ELFSIZE 32
# endif
# include <sys/exec_elf.h>
# ifndef PT_LOAD
# define PT_LOAD Elf_pt_load
# if 0 /* was in pkgsrc patches for 20.7 */
# define SHT_PROGBITS Elf_sht_progbits
# endif
# define SHT_SYMTAB Elf_sht_symtab
# define SHT_DYNSYM Elf_sht_dynsym
# define SHT_NULL Elf_sht_null
# define SHT_NOBITS Elf_sht_nobits
# define SHT_REL Elf_sht_rel
# define SHT_RELA Elf_sht_rela
# define SHN_UNDEF Elf_eshn_undefined
# define SHN_ABS Elf_eshn_absolute
# define SHN_COMMON Elf_eshn_common
# endif /* !PT_LOAD */
# ifdef __alpha__
# include <sys/exec_ecoff.h>
# define HDRR struct ecoff_symhdr
# define pHDRR HDRR *
# endif /* __alpha__ */
#ifdef __mips__ /* was in pkgsrc patches for 20.7 */
# define SHT_MIPS_DEBUG DT_MIPS_FLAGS
# define HDRR struct Elf_Shdr
#endif /* __mips__ */
#endif /* __NetBSD__ */
#ifdef __OpenBSD__
# include <sys/exec_elf.h>
#endif
#if __GNU_LIBRARY__ - 0 >= 6
# include <link.h> /* get ElfW etc */
#endif
#ifndef ElfW
# ifdef __STDC__
# define ElfBitsW(bits, type) Elf##bits##_##type
# else
# define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type
# endif
# ifdef _LP64
# define ELFSIZE 64
# else
# define ELFSIZE 32
# endif
/* This macro expands `bits' before invoking ElfBitsW. */
# define ElfExpandBitsW(bits, type) ElfBitsW (bits, type)
# define ElfW(type) ElfExpandBitsW (ELFSIZE, type)
#endif
#ifndef ELF_BSS_SECTION_NAME
#define ELF_BSS_SECTION_NAME ".bss"
#endif
/* Get the address of a particular section or program header entry,
* accounting for the size of the entries.
*/
/*
On PPC Reference Platform running Solaris 2.5.1
the plt section is also of type NOBI like the bss section.
(not really stored) and therefore sections after the bss
section start at the plt offset. The plt section is always
the one just before the bss section.
Thus, we modify the test from
if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
to
if (NEW_SECTION_H (nn).sh_offset >=
OLD_SECTION_H (old_bss_index-1).sh_offset)
This is just a hack. We should put the new data section
before the .plt section.
And we should not have this routine at all but use
the libelf library to read the old file and create the new
file.
The changed code is minimal and depends on prep set in m/prep.h
Erik Deumens
Quantum Theory Project
University of Florida
deumens@qtp.ufl.edu
Apr 23, 1996
*/
#define OLD_SECTION_H(n) \
(*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
#define NEW_SECTION_H(n) \
(*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
#define OLD_PROGRAM_H(n) \
(*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
#define NEW_PROGRAM_H(n) \
(*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
#define PATCH_INDEX(n) \
do { \
if ((int) (n) >= old_bss_index) \
(n)++; } while (0)
typedef unsigned char byte;
/* Round X up to a multiple of Y. */
static ElfW(Addr)
round_up (x, y)
ElfW(Addr) x, y;
{
int rem = x % y;
if (rem == 0)
return x;
return x - rem + y;
}
/* Return the index of the section named NAME.
SECTION_NAMES, FILE_NAME and FILE_H give information
about the file we are looking in.
If we don't find the section NAME, that is a fatal error
if NOERROR is 0; we return -1 if NOERROR is nonzero. */
static int
find_section (name, section_names, file_name, old_file_h, old_section_h, noerror)
char *name;
char *section_names;
char *file_name;
ElfW(Ehdr) *old_file_h;
ElfW(Shdr) *old_section_h;
int noerror;
{
int idx;
for (idx = 1; idx < old_file_h->e_shnum; idx++)
{
#ifdef DEBUG
fprintf (stderr, "Looking for %s - found %s\n", name,
section_names + OLD_SECTION_H (idx).sh_name);
#endif
if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
name))
break;
}
if (idx == old_file_h->e_shnum)
{
if (noerror)
return -1;
else
fatal ("Can't find %s in %s.\n", name, file_name);
}
return idx;
}
/* ****************************************************************
* unexec
*
* driving logic.
*
* In ELF, this works by replacing the old .bss section with a new
* .data section, and inserting an empty .bss immediately afterwards.
*
*/
void
unexec (new_name, old_name, data_start, bss_start, entry_address)
char *new_name, *old_name;
unsigned data_start, bss_start, entry_address;
{
int new_file, old_file, new_file_size;
/* Pointers to the base of the image of the two files. */
caddr_t old_base, new_base;
#if MAP_ANON == 0
int mmap_fd;
#else
# define mmap_fd -1
#endif
/* Pointers to the file, program and section headers for the old and
new files. */
ElfW(Ehdr) *old_file_h, *new_file_h;
ElfW(Phdr) *old_program_h, *new_program_h;
ElfW(Shdr) *old_section_h, *new_section_h;
/* Point to the section name table in the old file. */
char *old_section_names;
ElfW(Addr) old_bss_addr, new_bss_addr;
ElfW(Word) old_bss_size, new_data2_size;
ElfW(Off) new_data2_offset;
ElfW(Addr) new_data2_addr;
ElfW(Off) old_bss_offset;
ElfW(Word) new_data2_incr;
int n, nn;
int old_bss_index, old_sbss_index, old_plt_index;
int old_data_index, new_data2_index;
int old_mdebug_index;
struct stat stat_buf;
int old_file_size;
/* Open the old file, allocate a buffer of the right size, and read
in the file contents. */
old_file = open (old_name, O_RDONLY);
if (old_file < 0)
fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
if (fstat (old_file, &stat_buf) == -1)
fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
#if MAP_ANON == 0
mmap_fd = open ("/dev/zero", O_RDONLY);
if (mmap_fd < 0)
fatal ("Can't open /dev/zero for reading: errno %d\n", errno, 0);
#endif
/* We cannot use malloc here because that may use sbrk. If it does,
we'd dump our temporary buffers with Emacs, and we'd have to be
extra careful to use the correct value of sbrk(0) after
allocating all buffers in the code below, which we aren't. */
old_file_size = stat_buf.st_size;
old_base = mmap (NULL, old_file_size, PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE, mmap_fd, 0);
if (old_base == MAP_FAILED)
fatal ("Can't allocate buffer for %s\n", old_name, 0);
if (read (old_file, old_base, stat_buf.st_size) != stat_buf.st_size)
fatal ("Didn't read all of %s: errno %d\n", old_name, errno);
/* Get pointers to headers & section names */
old_file_h = (ElfW(Ehdr) *) old_base;
old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
old_section_names = (char *) old_base
+ OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
/* Find the mdebug section, if any. */
old_mdebug_index = find_section (".mdebug", old_section_names,
old_name, old_file_h, old_section_h, 1);
/* Find the old .bss section. Figure out parameters of the new
data2 and bss sections. */
old_bss_index = find_section (".bss", old_section_names,
old_name, old_file_h, old_section_h, 0);
old_sbss_index = find_section (".sbss", old_section_names,
old_name, old_file_h, old_section_h, 1);
if (old_sbss_index != -1)
if (OLD_SECTION_H (old_sbss_index).sh_type != SHT_NOBITS)
old_sbss_index = -1;
/* PowerPC64 has .plt in the BSS section. */
old_plt_index = find_section (".plt", old_section_names,
old_name, old_file_h, old_section_h, 1);
if (old_plt_index != -1)
if (OLD_SECTION_H (old_plt_index).sh_type != SHT_NOBITS)
old_plt_index = -1;
if (old_sbss_index == -1 && old_plt_index == -1)
{
old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
old_bss_offset = OLD_SECTION_H (old_bss_index).sh_offset;
new_data2_index = old_bss_index;
}
else if (old_plt_index != -1
&& (old_sbss_index == -1
|| (OLD_SECTION_H (old_sbss_index).sh_addr
> OLD_SECTION_H (old_plt_index).sh_addr)))
{
old_bss_addr = OLD_SECTION_H (old_plt_index).sh_addr;
old_bss_size = OLD_SECTION_H (old_bss_index).sh_size
+ OLD_SECTION_H (old_plt_index).sh_size;
if (old_sbss_index != -1)
old_bss_size += OLD_SECTION_H (old_sbss_index).sh_size;
old_bss_offset = OLD_SECTION_H (old_plt_index).sh_offset;
new_data2_index = old_plt_index;
}
else
{
old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr;
old_bss_size = OLD_SECTION_H (old_bss_index).sh_size
+ OLD_SECTION_H (old_sbss_index).sh_size;
old_bss_offset = OLD_SECTION_H (old_sbss_index).sh_offset;
new_data2_index = old_sbss_index;
}
/* Find the old .data section. Figure out parameters of
the new data2 and bss sections. */
old_data_index = find_section (".data", old_section_names,
old_name, old_file_h, old_section_h, 0);
#if defined (emacs) || !defined (DEBUG)
new_bss_addr = (ElfW(Addr)) sbrk (0);
#else
new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
#endif
new_data2_addr = old_bss_addr;
new_data2_size = new_bss_addr - old_bss_addr;
new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset
+ (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
/* This is the amount by which the sections following the bss sections
must be shifted in the image. It can differ from new_data2_size if
the end of the old .data section (and thus the offset of the .bss
section) was unaligned. */
new_data2_incr = new_data2_size + (new_data2_offset - old_bss_offset);
#ifdef DEBUG
fprintf (stderr, "old_bss_index %d\n", old_bss_index);
fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
fprintf (stderr, "old_bss_size %x\n", old_bss_size);
fprintf (stderr, "old_bss_offset %x\n", old_bss_offset);
fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
fprintf (stderr, "new_data2_size %x\n", new_data2_size);
fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
fprintf (stderr, "new_data2_incr %x\n", new_data2_incr);
#endif
if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
fatal (".bss shrank when undumping???\n", 0, 0);
/* Set the output file to the right size. Allocate a buffer to hold
the image of the new file. Set pointers to various interesting
objects. stat_buf still has old_file data. */
new_file = open (new_name, O_RDWR | O_CREAT, 0666);
if (new_file < 0)
fatal ("Can't creat (%s): errno %d\n", new_name, errno);
new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_incr;
if (ftruncate (new_file, new_file_size))
fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
new_base = mmap (NULL, new_file_size, PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE, mmap_fd, 0);
if (new_base == MAP_FAILED)
fatal ("Can't allocate buffer for %s\n", old_name, 0);
new_file_h = (ElfW(Ehdr) *) new_base;
new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
new_section_h = (ElfW(Shdr) *)
((byte *) new_base + old_file_h->e_shoff + new_data2_incr);
/* Make our new file, program and section headers as copies of the
originals. */
memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
memcpy (new_program_h, old_program_h,
old_file_h->e_phnum * old_file_h->e_phentsize);
/* Modify the e_shstrndx if necessary. */
PATCH_INDEX (new_file_h->e_shstrndx);
/* Fix up file header. We'll add one section. Section header is
further away now. */
new_file_h->e_shoff += new_data2_incr;
new_file_h->e_shnum += 1;
#ifdef DEBUG
fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
#endif
/* Fix up a new program header. Extend the writable data segment so
that the bss area is covered too. Find that segment by looking
for a segment that ends just before the .bss area. Make sure
that no segments are above the new .data2. Put a loop at the end
to adjust the offset and address of any segment that is above
data2, just in case we decide to allow this later. */
for (n = new_file_h->e_phnum - 1; n >= 0; n--)
{
/* Compute maximum of all requirements for alignment of section. */
ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align;
if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
#ifdef __sgi
/* According to r02kar@x4u2.desy.de (Karsten Kuenne)
and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we
always get "Program segment above .bss" when dumping
when the executable doesn't have an sbss section. */
if (old_sbss_index != -1)
#endif /* __sgi */
if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
> (old_sbss_index == -1
? old_bss_addr
: round_up (old_bss_addr, alignment)))
fatal ("Program segment above .bss in %s\n", old_name, 0);
if (NEW_PROGRAM_H (n).p_type == PT_LOAD
&& (round_up ((NEW_PROGRAM_H (n)).p_vaddr
+ (NEW_PROGRAM_H (n)).p_filesz,
alignment)
== round_up (old_bss_addr, alignment)))
break;
}
if (n < 0)
fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
/* Make sure that the size includes any padding before the old .bss
section. */
NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
#if 0 /* Maybe allow section after data2 - does this ever happen? */
for (n = new_file_h->e_phnum - 1; n >= 0; n--)
{
if (NEW_PROGRAM_H (n).p_vaddr
&& NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
NEW_PROGRAM_H (n).p_offset += new_data2_incr;
}
#endif
/* Fix up section headers based on new .data2 section. Any section
whose offset or virtual address is after the new .data2 section
gets its value adjusted. .bss size becomes zero and new address
is set. data2 section header gets added by copying the existing
.data header and modifying the offset, address and size. */
/* Walk through all section headers, insert the new data2 section right
before the new bss section. */
for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
{
caddr_t src;
/* If it is (s)bss section, insert the new data2 section before it. */
/* new_data2_index is the index of either old_sbss or old_bss, that was
chosen as a section for new_data2. */
if (n == new_data2_index)
{
/* Steal the data section header for this data2 section. */
memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
new_file_h->e_shentsize);
NEW_SECTION_H (nn).sh_addr = new_data2_addr;
NEW_SECTION_H (nn).sh_offset = new_data2_offset;
NEW_SECTION_H (nn).sh_size = new_data2_size;
/* Use the bss section's alignment. This will assure that the
new data2 section always be placed in the same spot as the old
bss section by any other application. */
NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
/* Now copy over what we have in the memory now. */
memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
(caddr_t) OLD_SECTION_H (n).sh_addr,
new_data2_size);
nn++;
}
memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
old_file_h->e_shentsize);
if (n == old_bss_index
/* The new bss and sbss section's size is zero, and its file offset
and virtual address should be off by NEW_DATA2_SIZE. */
|| n == old_sbss_index || n == old_plt_index
)
{
/* NN should be `old_s?bss_index + 1' at this point. */
NEW_SECTION_H (nn).sh_offset = new_data2_offset + new_data2_size;
NEW_SECTION_H (nn).sh_addr = new_data2_addr + new_data2_size;
/* Let the new bss section address alignment be the same as the
section address alignment followed the old bss section, so
this section will be placed in exactly the same place. */
NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
NEW_SECTION_H (nn).sh_size = 0;
}
else
{
/* Any section that was originally placed after the .bss
section should now be off by NEW_DATA2_INCR. If a
section overlaps the .bss section, consider it to be
placed after the .bss section. Overlap can occur if the
section just before .bss has less-strict alignment; this
was observed between .symtab and .bss on Solaris 2.5.1
(sparc) with GCC snapshot 960602.
> dump -h temacs
temacs:
**** SECTION HEADER TABLE ****
[No] Type Flags Addr Offset Size Name
Link Info Adralgn Entsize
[22] 1 3 0x335150 0x315150 0x4 .data.rel.local
0 0 0x4 0
[23] 8 3 0x335158 0x315158 0x42720 .bss
0 0 0x8 0
[24] 2 0 0 0x315154 0x1c9d0 .symtab
25 1709 0x4 0x10
*/
if (NEW_SECTION_H (nn).sh_offset >= old_bss_offset
|| (NEW_SECTION_H (nn).sh_offset + NEW_SECTION_H (nn).sh_size
> new_data2_offset))
NEW_SECTION_H (nn).sh_offset += new_data2_incr;
/* Any section that was originally placed after the section
header table should now be off by the size of one section
header table entry. */
if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
}
/* If any section hdr refers to the section after the new .data
section, make it refer to next one because we have inserted
a new section in between. */
PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
/* For symbol tables, info is a symbol table index,
so don't change it. */
if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
&& NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
if (old_sbss_index != -1)
if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".sbss"))
{
NEW_SECTION_H (nn).sh_offset =
round_up (NEW_SECTION_H (nn).sh_offset,
NEW_SECTION_H (nn).sh_addralign);
NEW_SECTION_H (nn).sh_type = SHT_PROGBITS;
}
/* Now, start to copy the content of sections. */
if (NEW_SECTION_H (nn).sh_type == SHT_NULL
|| NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
continue;
/* Write out the sections. .data and .data1 (and data2, called
".data" in the strings table) get copied from the current process
instead of the old file. */
if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
|| !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
".sdata")
|| !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
".lit4")
|| !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
".lit8")
/* The conditional bit below was in Oliva's original code
(1999-08-25) and seems to have been dropped by mistake
subsequently. It prevents a crash at startup under X in
`IRIX64 6.5 6.5.17m', whether compiled on that relase or
an earlier one. It causes no trouble on the other ELF
platforms I could test (Irix 6.5.15m, Solaris 8, Debian
Potato x86, Debian Woody SPARC); however, it's reported
to cause crashes under some version of GNU/Linux. It's
not yet clear what's changed in that Irix version to
cause the problem, or why the fix sometimes fails under
GNU/Linux. There's probably no good reason to have
something Irix-specific here, but this will have to do
for now. IRIX6_5 is the most specific macro we have to
test. -- fx 2002-10-01
The issue _looks_ as though it's gone away on 6.5.18m,
but maybe it's still lurking, to be triggered by some
change in the binary. It appears to concern the dynamic
loader, but I never got anywhere with an SGI support call
seeking clues. -- fx 2002-11-29. */
#ifdef IRIX6_5
|| !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
".got")
#endif
|| !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
".sdata1")
|| !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
".data1")
|| !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
".sbss"))
src = (caddr_t) OLD_SECTION_H (n).sh_addr;
else
src = old_base + OLD_SECTION_H (n).sh_offset;
memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
NEW_SECTION_H (nn).sh_size);
#ifdef __alpha__
/* Update Alpha COFF symbol table: */
if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
== 0)
{
pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
symhdr->cbLineOffset += new_data2_size;
symhdr->cbDnOffset += new_data2_size;
symhdr->cbPdOffset += new_data2_size;
symhdr->cbSymOffset += new_data2_size;
symhdr->cbOptOffset += new_data2_size;
symhdr->cbAuxOffset += new_data2_size;
symhdr->cbSsOffset += new_data2_size;
symhdr->cbSsExtOffset += new_data2_size;
symhdr->cbFdOffset += new_data2_size;
symhdr->cbRfdOffset += new_data2_size;
symhdr->cbExtOffset += new_data2_size;
}
#endif /* __alpha__ */
#if defined (_SYSTYPE_SYSV)
if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG
&& old_mdebug_index != -1)
{
int diff = NEW_SECTION_H(nn).sh_offset
- OLD_SECTION_H(old_mdebug_index).sh_offset;
HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
if (diff)
{
phdr->cbLineOffset += diff;
phdr->cbDnOffset += diff;
phdr->cbPdOffset += diff;
phdr->cbSymOffset += diff;
phdr->cbOptOffset += diff;
phdr->cbAuxOffset += diff;
phdr->cbSsOffset += diff;
phdr->cbSsExtOffset += diff;
phdr->cbFdOffset += diff;
phdr->cbRfdOffset += diff;
phdr->cbExtOffset += diff;
}
}
#endif /* _SYSTYPE_SYSV */
#if __sgi
/* Adjust the HDRR offsets in .mdebug and copy the
line data if it's in its usual 'hole' in the object.
Makes the new file debuggable with dbx.
patches up two problems: the absolute file offsets
in the HDRR record of .mdebug (see /usr/include/syms.h), and
the ld bug that gets the line table in a hole in the
elf file rather than in the .mdebug section proper.
David Anderson. davea@sgi.com Jan 16,1994. */
if (n == old_mdebug_index)
{
#define MDEBUGADJUST(__ct,__fileaddr) \
if (n_phdrr->__ct > 0) \
{ \
n_phdrr->__fileaddr += movement; \
}
HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset);
HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset);
unsigned movement = new_data2_size;
MDEBUGADJUST (idnMax, cbDnOffset);
MDEBUGADJUST (ipdMax, cbPdOffset);
MDEBUGADJUST (isymMax, cbSymOffset);
MDEBUGADJUST (ioptMax, cbOptOffset);
MDEBUGADJUST (iauxMax, cbAuxOffset);
MDEBUGADJUST (issMax, cbSsOffset);
MDEBUGADJUST (issExtMax, cbSsExtOffset);
MDEBUGADJUST (ifdMax, cbFdOffset);
MDEBUGADJUST (crfd, cbRfdOffset);
MDEBUGADJUST (iextMax, cbExtOffset);
/* The Line Section, being possible off in a hole of the object,
requires special handling. */
if (n_phdrr->cbLine > 0)
{
if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset
+ OLD_SECTION_H (n).sh_size))
{
/* line data is in a hole in elf. do special copy and adjust
for this ld mistake.
*/
n_phdrr->cbLineOffset += movement;
memcpy (n_phdrr->cbLineOffset + new_base,
o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
}
else
{
/* somehow line data is in .mdebug as it is supposed to be. */
MDEBUGADJUST (cbLine, cbLineOffset);
}
}
}
#endif /* __sgi */
/* If it is the symbol table, its st_shndx field needs to be patched. */
if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
|| NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
{
ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
unsigned int num = spt->sh_size / spt->sh_entsize;
ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
new_base);
for (; num--; sym++)
{
if ((sym->st_shndx == SHN_UNDEF)
|| (sym->st_shndx == SHN_ABS)
|| (sym->st_shndx == SHN_COMMON))
continue;
PATCH_INDEX (sym->st_shndx);
}
}
}
/* Update the symbol values of _edata and _end. */
for (n = new_file_h->e_shnum - 1; n; n--)
{
byte *symnames;
ElfW(Sym) *symp, *symendp;
if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
&& NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
continue;
symnames = ((byte *) new_base
+ NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
for (; symp < symendp; symp ++)
{
if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
|| strcmp ((char *) (symnames + symp->st_name), "end") == 0
|| strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
|| strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
/* Strictly speaking, #ifdef below is not necessary. But we
keep it to indicate that this kind of change may also be
necessary for other unexecs to support GNUstep. */
#ifdef NS_IMPL_GNUSTEP
/* ObjC runtime modifies the values of some data structures
such as classes and selectors in the .data section after
loading. As the dump process copies the .data section
from the current process, that causes problems when the
modified classes are reinitialized in the dumped
executable. We copy such data from the old file, not
from the current process. */
if (strncmp ((char *) (symnames + symp->st_name),
"_OBJC_", sizeof ("_OBJC_") - 1) == 0)
{
caddr_t old, new;
new = ((symp->st_value - NEW_SECTION_H (symp->st_shndx).sh_addr)
+ NEW_SECTION_H (symp->st_shndx).sh_offset + new_base);
/* "Unpatch" index. */
nn = symp->st_shndx;
if (nn > old_bss_index)
nn--;
old = ((symp->st_value - NEW_SECTION_H (symp->st_shndx).sh_addr)
+ OLD_SECTION_H (nn).sh_offset + old_base);
memcpy (new, old, symp->st_size);
}
#endif
}
}
/* This loop seeks out relocation sections for the data section, so
that it can undo relocations performed by the runtime linker. */
for (n = new_file_h->e_shnum - 1; n; n--)
{
ElfW(Shdr) section = NEW_SECTION_H (n);
/* Cause a compilation error if anyone uses n instead of nn below. */
struct {int a;} n;
(void)n.a; /* Prevent `unused variable' warnings. */
switch (section.sh_type)
{
default:
break;
case SHT_REL:
case SHT_RELA:
/* This code handles two different size structs, but there should
be no harm in that provided that r_offset is always the first
member. */
nn = section.sh_info;
if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
|| !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
".sdata")
|| !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
".lit4")
|| !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
".lit8")
#ifdef IRIX6_5 /* see above */
|| !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
".got")
#endif
|| !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
".sdata1")
|| !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
".data1"))
{
ElfW(Addr) offset = (NEW_SECTION_H (nn).sh_addr
- NEW_SECTION_H (nn).sh_offset);
caddr_t reloc = old_base + section.sh_offset, end;
for (end = reloc + section.sh_size; reloc < end;
reloc += section.sh_entsize)
{
ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
#ifdef __alpha__
/* The Alpha ELF binutils currently have a bug that
sometimes results in relocs that contain all
zeroes. Work around this for now... */
if (((ElfW(Rel) *) reloc)->r_offset == 0)
continue;
#endif
memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
}
}
break;
}
}
/* Write out new_file, and free the buffers. */
if (write (new_file, new_base, new_file_size) != new_file_size)
#ifndef emacs
fatal ("Didn't write %d bytes: errno %d\n",
new_file_size, errno);
#else
fatal ("Didn't write %d bytes to %s: errno %d\n",
new_file_size, new_name, errno);
#endif
munmap (old_base, old_file_size);
munmap (new_base, new_file_size);
/* Close the files and make the new file executable. */
#if MAP_ANON == 0
close (mmap_fd);
#endif
if (close (old_file))
fatal ("Can't close (%s): errno %d\n", old_name, errno);
if (close (new_file))
fatal ("Can't close (%s): errno %d\n", new_name, errno);
if (stat (new_name, &stat_buf) == -1)
fatal ("Can't stat (%s): errno %d\n", new_name, errno);
n = umask (777);
umask (n);
stat_buf.st_mode |= 0111 & ~n;
if (chmod (new_name, stat_buf.st_mode) == -1)
fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
}
/* arch-tag: e02e1512-95e2-4ef0-bba7-b6bce658f1e3
(do not change this comment) */
|