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
|
## Check llvm-readelf is able to dump the content of hash sections correctly.
## Check the output when both .hash and .gnu.hash sections are present.
# RUN: yaml2obj --docnum=1 %s -o %t1-32.so
# RUN: llvm-readelf --hash-symbols %t1-32.so \
# RUN: | FileCheck %s --strict-whitespace --match-full-lines --check-prefix HASH-32
# HASH-32: Symbol table of .hash for image:
# HASH-32-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
# HASH-32-NEXT: 1 0: 00000000 0 NOTYPE GLOBAL DEFAULT UND ccc
# HASH-32-NEXT: 5 0: 00001001 0 NOTYPE WEAK DEFAULT 1 bbb
# HASH-32-NEXT: 3 0: 00000001 0 NOTYPE GLOBAL DEFAULT ABS ddd
# HASH-32-NEXT: 2 0: 00001000 0 NOTYPE GLOBAL DEFAULT 1 aaa
# HASH-32-NEXT: 4 0: 00000000 0 NOTYPE GLOBAL DEFAULT 2 eee
# HASH-32-EMPTY:
# HASH-32: Symbol table of .gnu.hash for image:
# HASH-32-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
# HASH-32-NEXT: 2 1: 00001000 0 NOTYPE GLOBAL DEFAULT 1 aaa
# HASH-32-NEXT: 3 1: 00000001 0 NOTYPE GLOBAL DEFAULT ABS ddd
# HASH-32-NEXT: 4 2: 00000000 0 NOTYPE GLOBAL DEFAULT 2 eee
# HASH-32-NEXT: 5 2: 00001001 0 NOTYPE WEAK DEFAULT 1 bbb
# HASH-32-NOT: {{.}}
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_386
Sections:
- Name: .hash
Type: SHT_HASH
Flags: [ SHF_ALLOC ]
Link: .dynsym
Bucket: [ 1, 0, 0 ]
Chain: [ 0, 5, 4, 2, 0, 3 ]
- Name: .gnu.hash
Type: SHT_GNU_HASH
Flags: [ SHF_ALLOC ]
Link: .dynsym
Header:
SymNdx: 0x2
Shift2: 0x0
BloomFilter: [ 0x0 ]
HashBuckets: [ 0x0, 0x2, 0x4 ]
HashValues: [ 0x0B885C68, 0x0B886991, 0x0B886DF4, 0x0B8860CB ]
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Link: .dynstr
Entries:
## PT_LOAD's p_vaddr is 0x0. PT_LOAD's p_offset = 0x1bc. DT_HASH value is 0x0.
## llvm-readelf will read .hash content from p_offset + (p_vaddr - DT_HASH value) = 0x1bc.
## This matches the file offset of the .hash section.
- Tag: DT_HASH
Value: 0x0000000000000000
- Tag: DT_GNU_HASH
## PT_LOAD's p_vaddr is 0x0. PT_LOAD's p_offset = 0x1bc. DT_GNU_HASH value is 0x2c (size of .hash = 0x2c).
## llvm-readelf will read .gnu.hash content from p_offset + (p_vaddr - DT_GNU_HASH value) = 0x1e8.
## This matches the file offset of the .gnu.hash section.
Value: 0x000000000000002C
- Tag: DT_NULL
Value: 0x0000000000000000
DynamicSymbols:
- Name: ccc
Binding: STB_GLOBAL
- Name: aaa
Section: .hash
Binding: STB_GLOBAL
Value: 0x0000000000001000
- Name: ddd
Index: SHN_ABS
Binding: STB_GLOBAL
Value: 0x0000000000000001
- Name: eee
Section: .gnu.hash
Binding: STB_GLOBAL
- Name: bbb
Section: .hash
Binding: STB_WEAK
Value: 0x0000000000001001
ProgramHeaders:
- Type: PT_LOAD
Flags: [ PF_R, PF_X ]
Sections:
- Section: .hash
- Section: .gnu.hash
- Section: .dynamic
# RUN: yaml2obj --docnum=2 %s -o %t1-64.so
# RUN: llvm-readelf --hash-symbols %t1-64.so | FileCheck %s --check-prefix HASH-64
# HASH-64: Symbol table of .hash for image:
# HASH-64-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
# HASH-64-NEXT: 1 0: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND ccc
# HASH-64-NEXT: 5 0: 0000000000001001 0 NOTYPE WEAK DEFAULT 1 bbb
# HASH-64-NEXT: 3 0: 0000000000000001 0 NOTYPE GLOBAL DEFAULT ABS ddd
# HASH-64-NEXT: 2 0: 0000000000001000 0 NOTYPE GLOBAL DEFAULT 1 aaa
# HASH-64-NEXT: 4 0: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 2 eee
# HASH-64-EMPTY:
# HASH-64-NEXT: Symbol table of .gnu.hash for image:
# HASH-64-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
# HASH-64-NEXT: 2 1: 0000000000001000 0 NOTYPE GLOBAL DEFAULT 1 aaa
# HASH-64-NEXT: 3 1: 0000000000000001 0 NOTYPE GLOBAL DEFAULT ABS ddd
# HASH-64-NEXT: 4 2: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 2 eee
# HASH-64-NEXT: 5 2: 0000000000001001 0 NOTYPE WEAK DEFAULT 1 bbb
# HASH-64-NOT: {{.}}
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .hash
Type: SHT_HASH
Flags: [ SHF_ALLOC ]
Link: .dynsym
Bucket: [ 1, 0, 0 ]
Chain: [ 0, 5, 4, 2, 0, 3 ]
- Name: .gnu.hash
Type: SHT_GNU_HASH
Flags: [ SHF_ALLOC ]
Link: .dynsym
Header:
SymNdx: 0x2
Shift2: 0x0
BloomFilter: [ 0x0 ]
HashBuckets: [ 0x00000000, 0x00000002, 0x00000004 ]
HashValues: [ 0x0B885C68, 0x0B886991, 0x0B886DF4, 0x0B8860CB ]
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Link: .dynstr
Entries:
- Tag: DT_HASH
## PT_LOAD's p_vaddr is 0x0. PT_LOAD's p_offset = 0x2b8. DT_HASH value is 0x0.
## llvm-readelf will read .hash content from p_offset + (p_vaddr - DT_HASH value) = 0x2b8.
## This matches the file offset of the .hash section.
Value: 0x0000000000000000
- Tag: DT_GNU_HASH
## PT_LOAD's p_vaddr is 0x0. PT_LOAD's p_offset = 0x2b8. DT_GNU_HASH value is 0x2c (size of .hash = 0x2c).
## llvm-readelf will read .gnu.hash content from p_offset + (p_vaddr - DT_GNU_HASH value) = 0x2e4.
## This matches the file offset of the .gnu.hash section.
Value: 0x000000000000002c
- Tag: DT_NULL
Value: 0x0000000000000000
DynamicSymbols:
- Name: ccc
Binding: STB_GLOBAL
- Name: aaa
Section: .hash
Binding: STB_GLOBAL
Value: 0x0000000000001000
- Name: ddd
Index: SHN_ABS
Binding: STB_GLOBAL
Value: 0x0000000000000001
- Name: eee
Section: .gnu.hash
Binding: STB_GLOBAL
- Name: bbb
Section: .hash
Binding: STB_WEAK
Value: 0x0000000000001001
ProgramHeaders:
- Type: PT_LOAD
Flags: [ PF_R, PF_X ]
Sections:
- Section: .hash
- Section: .gnu.hash
- Section: .dynamic
## Check the output when only .hash section is present.
# RUN: yaml2obj --docnum=3 %s -o %t2-32.so
# RUN: llvm-readelf --hash-symbols %t2-32.so \
# RUN: | FileCheck %s --strict-whitespace --match-full-lines --check-prefix ONLY-HASH-32
# ONLY-HASH-32: Symbol table of .hash for image:
# ONLY-HASH-32-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
# ONLY-HASH-32-NEXT: 1 0: 00000000 0 NOTYPE GLOBAL DEFAULT UND ccc
# ONLY-HASH-32-NEXT: 5 0: 00001001 0 NOTYPE WEAK DEFAULT 1 bbb
# ONLY-HASH-32-NEXT: 3 0: 00000001 0 NOTYPE GLOBAL DEFAULT ABS ddd
# ONLY-HASH-32-NEXT: 2 0: 00001000 0 NOTYPE GLOBAL DEFAULT 1 aaa
# ONLY-HASH-32-NEXT: 4 0: 00000000 0 NOTYPE GLOBAL DEFAULT 2 eee
# ONLY-HASH-32-NOT: {{.}}
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_386
Sections:
- Name: .hash
Type: SHT_HASH
Flags: [ SHF_ALLOC ]
Link: .dynsym
Bucket: [ 1, 0, 0 ]
Chain: [ 0, 5, 4, 2, 0, 3 ]
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Link: .dynstr
Entries:
- Tag: DT_HASH
Value: 0x0000000000000000
- Tag: DT_NULL
Value: 0x0000000000000000
DynamicSymbols:
- Name: ccc
Binding: STB_GLOBAL
- Name: aaa
Section: .hash
Binding: STB_GLOBAL
Value: 0x0000000000001000
- Name: ddd
Index: SHN_ABS
Binding: STB_GLOBAL
Value: 0x0000000000000001
- Name: eee
Section: .dynamic
Binding: STB_GLOBAL
- Name: bbb
Section: .hash
Binding: STB_WEAK
Value: 0x0000000000001001
ProgramHeaders:
- Type: PT_LOAD
Flags: [ PF_R, PF_X ]
Sections:
- Section: .hash
- Section: .dynamic
## Check the output when only .gnu.hash section is present.
# RUN: yaml2obj --docnum=4 %s -o %t3-32.so
# RUN: llvm-readelf --hash-symbols %t3-32.so \
# RUN: | FileCheck %s --strict-whitespace --match-full-lines --check-prefix ONLY-GNUHASH-32
# ONLY-GNUHASH-32: Symbol table of .gnu.hash for image:
# ONLY-GNUHASH-32-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
# ONLY-GNUHASH-32-NEXT: 2 1: 00001000 0 NOTYPE GLOBAL DEFAULT 2 aaa
# ONLY-GNUHASH-32-NEXT: 3 1: 00000001 0 NOTYPE GLOBAL DEFAULT ABS ddd
# ONLY-GNUHASH-32-NEXT: 4 2: 00000000 0 NOTYPE GLOBAL DEFAULT 1 eee
# ONLY-GNUHASH-32-NEXT: 5 2: 00001001 0 NOTYPE WEAK DEFAULT 2 bbb
# ONLY-GNUHASH-32-NOT: {{.}}
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_386
Sections:
- Name: .gnu.hash
Type: SHT_GNU_HASH
Flags: [ SHF_ALLOC ]
Link: .dynsym
Header:
SymNdx: 0x2
Shift2: 0x0
BloomFilter: [ 0x0 ]
HashBuckets: [ 0x0, 0x2, 0x4 ]
HashValues: [ 0x0B885C68, 0x0B886991, 0x0B886DF4, 0x0B8860CB ]
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Link: .dynstr
Entries:
- Tag: DT_GNU_HASH
Value: 0x0000000000000000
- Tag: DT_NULL
Value: 0x0000000000000000
DynamicSymbols:
- Name: ccc
Binding: STB_GLOBAL
- Name: aaa
Section: .dynamic
Binding: STB_GLOBAL
Value: 0x0000000000001000
- Name: ddd
Index: SHN_ABS
Binding: STB_GLOBAL
Value: 0x0000000000000001
- Name: eee
Section: .gnu.hash
Binding: STB_GLOBAL
- Name: bbb
Section: .dynamic
Binding: STB_WEAK
Value: 0x0000000000001001
ProgramHeaders:
- Type: PT_LOAD
Flags: [ PF_R, PF_X ]
Sections:
- Section: .gnu.hash
- Section: .dynamic
## Show that if there are no hash sections, we do not print anything.
# RUN: yaml2obj --docnum=5 %s -o %t4.so
# RUN: llvm-readelf --hash-symbols %t4.so \
# RUN: | FileCheck %s --check-prefix NO-HASH --allow-empty
# NO-HASH-NOT: {{.}}
## Sanity check that we can still find the dynamic symbols (i.e. the above test
## doesn't pass due to a mistake in the dynamic section).
# RUN: llvm-readelf --dyn-symbols %t4.so | FileCheck %s --check-prefix DYNSYMS
# DYNSYMS: Symbol table '.dynsym' contains 2 entries:
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .dynstr
Type: SHT_STRTAB
Flags: [ SHF_ALLOC ]
AddressAlign: 0x100
EntSize: 0x1
- Name: .dynsym
Type: SHT_DYNSYM
Flags: [ SHF_ALLOC ]
Link: .dynstr
Address: 0x100
AddressAlign: 0x100
EntSize: 0x18
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Address: 0x0000000000001000
Link: .dynstr
AddressAlign: 0x0000000000001000
EntSize: 0x0000000000000010
Entries:
- Tag: DT_STRTAB
Value: 0x0000000000000000
- Tag: DT_STRSZ
Value: 0x0000000000000009
- Tag: DT_SYMTAB
Value: 0x0000000000000100
- Tag: DT_SYMENT
Value: 0x0000000000000018
- Tag: DT_NULL
Value: 0x0000000000000000
- Name: .text.foo
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
Size: 0x40
Address: 0x2000
AddressAlign: 0x2000
DynamicSymbols:
- Name: _Z3fooi
Binding: STB_GLOBAL
ProgramHeaders:
- Type: PT_LOAD
Flags: [ PF_R, PF_X ]
VAddr: 0x0
PAddr: 0x0
Sections:
- Section: .dynsym
- Section: .dynstr
- Section: .dynamic
- Section: .text.foo
- Type: PT_DYNAMIC
Flags: [ PF_R ]
VAddr: 0x1000
PAddr: 0x1000
Sections:
- Section: .dynamic
## Show that we report a warning for a hash table which contains an entry of
## the bucket array pointing to a cycle.
# RUN: yaml2obj --docnum=6 %s -o %t6.so
# RUN: llvm-readelf --hash-symbols %t6.so 2>&1 | FileCheck %s -DFILE=%t6.so --check-prefix=BROKEN
# BROKEN: Symbol table of .hash for image:
# BROKEN-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
# BROKEN-NEXT: 1 0: 00000000 0 NOTYPE LOCAL DEFAULT UND aaa
# BROKEN: warning: '[[FILE]]': .hash section is invalid: bucket 1: a cycle was detected in the linked chain
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_386
Sections:
- Name: .hash
Type: SHT_HASH
Link: .dynsym
Bucket: [ 1 ]
Chain: [ 1, 1 ]
- Name: .dynamic
Type: SHT_DYNAMIC
Entries:
## llvm-readelf will read the hash table from the file offset
## p_offset + (p_vaddr - DT_HASH) = p_offset + (0 - 0) = p_offset,
## which is the start of PT_LOAD, i.e. the file offset of .hash.
- Tag: DT_HASH
Value: 0x0
DynamicSymbols:
- Name: aaa
- Name: bbb
ProgramHeaders:
- Type: PT_LOAD
Sections:
- Section: .hash
- Section: .dynamic
|
