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
|
## In this file we have tests for the SHT_SYMTAB_SHNDX section
## and the DT_SYMTAB_SHNDX dynamic tag.
## Check that different SHT_SYMTAB_SHNDX sections can be used with different symbol tables.
## In this test we check that we print different section indexes for regular and dynamic
## symbol tables that are linked to different SHT_SYMTAB_SHNDX sections.
# RUN: yaml2obj --docnum=1 %s -o %t1
# RUN: llvm-readelf --symbols --dyn-syms %t1 2>&1 | FileCheck %s --check-prefix=GNU
# RUN: llvm-readobj --symbols --dyn-syms %t1 2>&1 | FileCheck %s --check-prefix=LLVM
# GNU: Symbol table '.dynsym' contains 3 entries:
# GNU-NEXT: Num: Value Size Type Bind Vis Ndx Name
# GNU-NEXT: 0: 00000000 0 NOTYPE LOCAL DEFAULT UND
# GNU-NEXT: 1: 00000000 0 NOTYPE LOCAL DEFAULT 3 dynsym1
# GNU-NEXT: 2: 00000000 0 NOTYPE LOCAL DEFAULT 2 dynsym2
# GNU: Symbol table '.symtab' contains 3 entries:
# GNU-NEXT: Num: Value Size Type Bind Vis Ndx Name
# GNU-NEXT: 0: 00000000 0 NOTYPE LOCAL DEFAULT UND
# GNU-NEXT: 1: 00000000 0 NOTYPE LOCAL DEFAULT 2 sym1
# GNU-NEXT: 2: 00000000 0 NOTYPE LOCAL DEFAULT 1 sym2
# LLVM: Symbols [
# LLVM-NEXT: Symbol {
# LLVM-NEXT: Name: (0)
# LLVM: Section: Undefined (0x0)
# LLVM-NEXT: }
# LLVM-NEXT: Symbol {
# LLVM-NEXT: Name: sym1 (6)
# LLVM: Section: .section2 (0x2)
# LLVM-NEXT: }
# LLVM-NEXT: Symbol {
# LLVM-NEXT: Name: sym2 (1)
# LLVM: Section: .section1 (0x1)
# LLVM-NEXT: }
# LLVM-NEXT: ]
# LLVM: DynamicSymbols [
# LLVM-NEXT: Symbol {
# LLVM-NEXT: Name: (0)
# LLVM: Section: Undefined (0x0)
# LLVM-NEXT: }
# LLVM-NEXT: Symbol {
# LLVM-NEXT: Name: dynsym1 (9)
# LLVM: Section: .section3 (0x3)
# LLVM-NEXT: }
# LLVM-NEXT: Symbol {
# LLVM-NEXT: Name: dynsym2 (1)
# LLVM: Section: .section2 (0x2)
# LLVM-NEXT: }
# LLVM-NEXT: ]
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_REL
Sections:
- Name: .section1
Type: SHT_PROGBITS
- Name: .section2
Type: SHT_PROGBITS
- Name: .section3
Type: SHT_PROGBITS
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Address: 0x1000
Offset: 0x1000
Entries:
- Tag: [[TAGNAME=DT_SYMTAB_SHNDX]]
Value: [[SYMTABSHNDX=0x2100]] ## Address of .bar section.
- Tag: DT_NULL
Value: 0
## By naming the SHT_SYMTAB_SHNDX sections to .foo and .bar we verify that we
## don't use their names to locate them.
- Name: .foo
Type: SHT_SYMTAB_SHNDX
Flags: [ SHF_ALLOC ]
Link: [[SHNDXLINK=.symtab]]
Entries: [ 0, 2, 1 ]
Offset: 0x2000
Address: 0x2000
- Name: .bar
Type: SHT_SYMTAB_SHNDX
Flags: [ SHF_ALLOC ]
Link: .dynsym
Entries: [ 0, 3, 2 ]
Offset: 0x2100
Address: 0x2100
Symbols:
- Name: sym1
Index: SHN_XINDEX
- Name: sym2
Index: SHN_XINDEX
DynamicSymbols:
- Name: dynsym1
Index: SHN_XINDEX
- Name: dynsym2
Index: SHN_XINDEX
ProgramHeaders:
- Type: PT_LOAD
VAddr: 0x1000
FirstSec: .dynamic
LastSec: .bar
- Type: PT_DYNAMIC
VAddr: 0x1000
FirstSec: .dynamic
LastSec: .dynamic
## Check that we locate the SHT_SYMTAB_SHNDX section using the DT_SYMTAB_SHNDX
## dynamic tag when dumping dynamic symbols. In this case we make the value of
## DT_SYMTAB_SHNDX point to the SHT_SYMTAB_SHNDX section that is
## linked with the static symbol table and check that we use it.
# RUN: yaml2obj --docnum=1 -DSYMTABSHNDX=0x2000 %s -o %t2
# RUN: llvm-readelf --dyn-syms %t2 2>&1 | FileCheck %s --check-prefix=DYNTAG-GNU
# RUN: llvm-readobj --dyn-syms %t2 2>&1 | FileCheck %s --check-prefix=DYNTAG-LLVM
# DYNTAG-GNU: Symbol table '.dynsym' contains 3 entries:
# DYNTAG-GNU-NEXT: Num: Value Size Type Bind Vis Ndx Name
# DYNTAG-GNU-NEXT: 0: 00000000 0 NOTYPE LOCAL DEFAULT UND
# DYNTAG-GNU-NEXT: 1: 00000000 0 NOTYPE LOCAL DEFAULT 2 dynsym1
# DYNTAG-GNU-NEXT: 2: 00000000 0 NOTYPE LOCAL DEFAULT 1 dynsym2
# DYNTAG-LLVM: Name: dynsym1 (9)
# DYNTAG-LLVM: Section: .section2 (0x2)
# DYNTAG-LLVM-NEXT: }
# DYNTAG-LLVM-NEXT: Symbol {
# DYNTAG-LLVM-NEXT: Name: dynsym2 (1)
# DYNTAG-LLVM: Section: .section1 (0x1)
# DYNTAG-LLVM-NEXT: }
# DYNTAG-LLVM-NEXT: ]
## Check that we report a warning when we dump a dynamic symbol table that
## contains symbols with extended indices, but we don't have a DT_SYMTAB_SHNDX tag to locate
## the corresponding extended indexes table.
# RUN: yaml2obj --docnum=1 -DTAGNAME=0x0 -DSYMTABSHNDX=0x0 %s -o %t3
# RUN: llvm-readelf --symbols --dyn-syms %t3 2>&1 | FileCheck %s -DFILE=%t3 --check-prefix=NOTAG-GNU
# RUN: llvm-readobj --symbols --dyn-syms %t3 2>&1 | FileCheck %s -DFILE=%t3 --check-prefix=NOTAG-LLVM
# NOTAG-GNU: Symbol table '.dynsym' contains 3 entries:
# NOTAG-GNU-NEXT: Num: Value Size Type Bind Vis Ndx Name
# NOTAG-GNU-NEXT: 0: 00000000 0 NOTYPE LOCAL DEFAULT UND
# NOTAG-GNU-NEXT: warning: '[[FILE]]': found an extended symbol index (1), but unable to locate the extended symbol index table
# NOTAG-GNU-NEXT: 1: 00000000 0 NOTYPE LOCAL DEFAULT RSV[0xffff] dynsym1
# NOTAG-GNU-NEXT: warning: '[[FILE]]': found an extended symbol index (2), but unable to locate the extended symbol index table
# NOTAG-GNU-NEXT: 2: 00000000 0 NOTYPE LOCAL DEFAULT RSV[0xffff] dynsym2
# NOTAG-LLVM: Symbol {
# NOTAG-LLVM: Name: dynsym1 (9)
# NOTAG-LLVM-NEXT: Value: 0x0
# NOTAG-LLVM-NEXT: Size: 0
# NOTAG-LLVM-NEXT: Binding: Local (0x0)
# NOTAG-LLVM-NEXT: Type: None (0x0)
# NOTAG-LLVM-NEXT: Other: 0
# NOTAG-LLVM-NEXT: warning: '[[FILE]]': found an extended symbol index (1), but unable to locate the extended symbol index table
# NOTAG-LLVM-NEXT: Section: Reserved (0xFFFF)
# NOTAG-LLVM-NEXT: }
# NOTAG-LLVM-NEXT: Symbol {
# NOTAG-LLVM-NEXT: Name: dynsym2 (1)
# NOTAG-LLVM-NEXT: Value: 0x0
# NOTAG-LLVM-NEXT: Size: 0
# NOTAG-LLVM-NEXT: Binding: Local (0x0)
# NOTAG-LLVM-NEXT: Type: None (0x0)
# NOTAG-LLVM-NEXT: Other: 0
# NOTAG-LLVM-NEXT: warning: '[[FILE]]': found an extended symbol index (2), but unable to locate the extended symbol index table
# NOTAG-LLVM-NEXT: Section: Reserved (0xFFFF)
# NOTAG-LLVM-NEXT: }
## In this case we have a SHT_SYMTAB_SHNDX section with a sh_link field that has a
## value that is larger than the number of sections. Check we report a warning.
# RUN: yaml2obj --docnum=1 -DSHNDXLINK=0xFF %s -o %t4
# RUN: llvm-readelf --symbols --dyn-syms %t4 2>&1 | \
# RUN: FileCheck %s -DFILE=%t4 --check-prefixes=BROKENLINK,BROKENLINK-GNU --implicit-check-not=warning:
# RUN: llvm-readobj --symbols --dyn-syms %t4 2>&1 | \
# RUN: FileCheck %s -DFILE=%t4 --check-prefixes=BROKENLINK,BROKENLINK-LLVM --implicit-check-not=warning:
# BROKENLINK: warning: '[[FILE]]': unable to get the associated symbol table for SHT_SYMTAB_SHNDX section with index 5: sh_link (255) is greater than or equal to the total number of sections (12)
# BROKENLINK-GNU: warning: '[[FILE]]': found an extended symbol index (1), but unable to locate the extended symbol index table
# BROKENLINK-GNU-NEXT: 1: 00000000 0 NOTYPE LOCAL DEFAULT RSV[0xffff] sym1
# BROKENLINK-GNU-NEXT: warning: '[[FILE]]': found an extended symbol index (2), but unable to locate the extended symbol index table
# BROKENLINK-GNU-NEXT: 2: 00000000 0 NOTYPE LOCAL DEFAULT RSV[0xffff] sym2
# BROKENLINK-LLVM: Symbol {
# BROKENLINK-LLVM: Name: sym1 (6)
# BROKENLINK-LLVM: warning: '[[FILE]]': found an extended symbol index (1), but unable to locate the extended symbol index table
# BROKENLINK-LLVM-NEXT: Section: Reserved (0xFFFF)
# BROKENLINK-LLVM-NEXT: }
# BROKENLINK-LLVM-NEXT: Symbol {
# BROKENLINK-LLVM-NEXT: Name: sym2 (1)
# BROKENLINK-LLVM: warning: '[[FILE]]': found an extended symbol index (2), but unable to locate the extended symbol index table
# BROKENLINK-LLVM-NEXT: Section: Reserved (0xFFFF)
# BROKENLINK-LLVM-NEXT: }
## Check we report a warning when multiple SHT_SYMTAB_SHNDX sections are linked to a symbol table.
## In this case, 2 sections are linked to the dynamic symbol table. Check it doesn't affect
## anything, because the SHT_SYMTAB_SHNDX section specified by the DT_SYMTAB_SHNDX tag is still used.
# RUN: yaml2obj --docnum=1 -DSHNDXLINK=.dynsym %s -o %t.multiple
# RUN: llvm-readelf --symbols --dyn-syms %t.multiple 2>&1 | \
# RUN: FileCheck %s -DFILE=%t.multiple --check-prefix=MULTIPLE-GNU
# RUN: llvm-readobj --symbols --dyn-syms %t.multiple 2>&1 | \
# RUN: FileCheck %s -DFILE=%t.multiple --check-prefix=MULTIPLE-LLVM
# MULTIPLE-GNU: warning: '[[FILE]]': multiple SHT_SYMTAB_SHNDX sections are linked to SHT_SYMTAB_SHNDX section with index 6
# MULTIPLE-GNU: Symbol table '.dynsym' contains 3 entries:
# MULTIPLE-GNU-NEXT: Num: Value Size Type Bind Vis Ndx Name
# MULTIPLE-GNU-NEXT: 0: 00000000 0 NOTYPE LOCAL DEFAULT UND
# MULTIPLE-GNU-NEXT: 1: 00000000 0 NOTYPE LOCAL DEFAULT 3 dynsym1
# MULTIPLE-GNU-NEXT: 2: 00000000 0 NOTYPE LOCAL DEFAULT 2 dynsym2
# MULTIPLE-LLVM: Symbol {
# MULTIPLE-LLVM: Name: dynsym1 (9)
# MULTIPLE-LLVM-NEXT: Value: 0x0
# MULTIPLE-LLVM-NEXT: Size: 0
# MULTIPLE-LLVM-NEXT: Binding: Local (0x0)
# MULTIPLE-LLVM-NEXT: Type: None (0x0)
# MULTIPLE-LLVM-NEXT: Other: 0
# MULTIPLE-LLVM-NEXT: Section: .section3 (0x3)
# MULTIPLE-LLVM-NEXT: }
# MULTIPLE-LLVM-NEXT: Symbol {
# MULTIPLE-LLVM-NEXT: Name: dynsym2 (1)
# MULTIPLE-LLVM-NEXT: Value: 0x0
# MULTIPLE-LLVM-NEXT: Size: 0
# MULTIPLE-LLVM-NEXT: Binding: Local (0x0)
# MULTIPLE-LLVM-NEXT: Type: None (0x0)
# MULTIPLE-LLVM-NEXT: Other: 0
# MULTIPLE-LLVM-NEXT: Section: .section2 (0x2)
# MULTIPLE-LLVM-NEXT: }
## In this case we have a SHT_SYMTAB_SHNDX section placed right before
## the end of the file. This table is broken: it contains fewer entries than
## the number of dynamic symbols.
## Check we report a warning when trying to read an extended symbol index past
## the end of the file.
# RUN: yaml2obj --docnum=2 %s -o %t.pastend
# RUN: llvm-readelf --dyn-syms %t.pastend 2>&1 | \
# RUN: FileCheck %s -DFILE=%t.pastend --check-prefix=PASTEND-GNU --implicit-check-not=warning:
# RUN: llvm-readobj --dyn-syms %t.pastend 2>&1 | \
# RUN: FileCheck %s -DFILE=%t.pastend --check-prefix=PASTEND-LLVM --implicit-check-not=warning:
# PASTEND-GNU: 1: 00000000 0 NOTYPE LOCAL DEFAULT 1 dynsym1
# PASTEND-GNU-NEXT: warning: '[[FILE]]': unable to read an extended symbol table at index 2: can't read past the end of the file
# PASTEND-GNU-NEXT: 2: 00000000 0 NOTYPE LOCAL DEFAULT RSV[0xffff] dynsym2
# PASTEND-LLVM: Symbol {
# PASTEND-LLVM: Name: dynsym2 (1)
# PASTEND-LLVM-NEXT: Value: 0x0
# PASTEND-LLVM-NEXT: Size: 0
# PASTEND-LLVM-NEXT: Binding: Local (0x0)
# PASTEND-LLVM-NEXT: Type: None (0x0)
# PASTEND-LLVM-NEXT: Other: 0
# PASTEND-LLVM-NEXT: warning: '[[FILE]]': unable to read an extended symbol table at index 2: can't read past the end of the file
# PASTEND-LLVM-NEXT: Section: Reserved (0xFFFF)
# PASTEND-LLVM-NEXT: }
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_REL
Sections:
- Name: .section1
Type: SHT_PROGBITS
- Name: .section2
Type: SHT_PROGBITS
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Address: 0x1000
Offset: 0x1000
Entries:
- Tag: DT_SYMTAB
Value: 0x1500
- Tag: DT_HASH
Value: 0x1600
- Tag: DT_STRTAB
Value: 0x1700
- Tag: DT_STRSZ
Value: 17 ## ".dynsym1.dynsym2."
- Tag: DT_SYMTAB_SHNDX
Value: 0x2000
- Tag: DT_NULL
Value: 0
- Name: .dynsym
Type: SHT_DYNSYM
Flags: [ SHF_ALLOC ]
Offset: 0x1500
Address: 0x1500
## We need the .hash table to infer the number
## of dynamic symbols.
- Name: .hash
Type: SHT_HASH
Flags: [ SHF_ALLOC ]
Offset: 0x1600
Address: 0x1600
Bucket: [ 1 ]
Chain: [ 1, 2, 3 ]
- Name: .dynstr
Type: SHT_STRTAB
Flags: [ SHF_ALLOC ]
Offset: 0x1700
Address: 0x1700
- Name: .strtab
Type: SHT_STRTAB
- Name: .symtab_shndx
Type: SHT_SYMTAB_SHNDX
Flags: [ SHF_ALLOC ]
Entries: [ 0, 1 ]
Offset: 0x2000
Address: 0x2000
- Type: SectionHeaderTable
NoHeaders: true
DynamicSymbols:
- Name: dynsym1
Index: SHN_XINDEX
- Name: dynsym2
Index: SHN_XINDEX
ProgramHeaders:
- Type: PT_LOAD
VAddr: 0x1000
FirstSec: .dynamic
LastSec: .symtab_shndx
- Type: PT_DYNAMIC
VAddr: 0x1000
FirstSec: .dynamic
LastSec: .dynamic
|
