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llvm-project/llvm/test/tools/llvm-readobj/ELF/hash-symbols.test

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## 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 -DBITS=32 %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
# RUN: yaml2obj --docnum=1 -DBITS=64 %s -o %t1-64.so
# RUN: llvm-readelf --hash-symbols %t1-64.so | FileCheck %s --check-prefix HASH-64
# 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: {{.}}
# 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: ELFCLASS[[BITS]]
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: [ 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. DT_HASH value is 0x0.
## llvm-readelf will read .hash content from PT_LOAD's p_offset + (DT_HASH value - p_vaddr).
## 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. DT_GNU_HASH value is 0x2c (size of .hash = 0x2c).
## llvm-readelf will read .gnu.hash content from PT_LOAD's p_offset + (DT_GNU_HASH value - p_vaddr).
## 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=2 %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=3 %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=4 %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
Sections:
- Section: .dynsym
- Section: .dynstr
- Section: .dynamic
- Section: .text.foo
- Type: PT_DYNAMIC
Flags: [ PF_R ]
VAddr: 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=5 %s -o %t5.so
# RUN: llvm-readelf --hash-symbols %t5.so 2>&1 | FileCheck %s -DFILE=%t5.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
## Each SHT_HASH section starts with two 32-bit fields: nbucket and nchain.
## Check we report an error when a DT_HASH value points to data that has size less than 8 bytes.
# RUN: yaml2obj --docnum=6 %s -o %t6.o
# RUN: llvm-readelf --hash-symbols %t6.o 2>&1 | FileCheck %s --check-prefix=ERR1 -DFILE=%t6.o
# ERR1: warning: '[[FILE]]': the hash table at offset 0x2b1 goes past the end of the file (0x2b8){{$}}
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .hash
Type: SHT_HASH
Flags: [ SHF_ALLOC ]
Bucket: [ 0 ]
Chain: [ 0 ]
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_WRITE, SHF_ALLOC ]
Entries:
- Tag: DT_HASH
Value: 0x239
- Tag: DT_NULL
Value: 0x0
DynamicSymbols: []
ProgramHeaders:
- Type: PT_LOAD
FileSize: 0x23a
Sections:
- Section: .hash
- Section: .dynamic
## Check we report a warning when the hash table goes past the end of the file.
## Case A.1: the hash table ends right before the EOF. We have a broken nbucket
## field that has a value larger than the number of buckets.
# RUN: yaml2obj --docnum=7 %s -o %t7.1.o -DNBUCKET=0x5d -DNCHAIN=0x1
# RUN: llvm-readelf --hash-symbols %t7.1.o 2>&1 | FileCheck %s --check-prefix=NOERR1
# NOERR1: Symbol table of .hash for image:
# NOERR1-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
# NOERR1-NEXT-EMPTY:
## Case A.2: the hash table ends 1 byte past the EOF. We have a broken nbucket
## field that has a value larger than the number of buckets.
# RUN: yaml2obj --docnum=7 %s -o %t7.2.o -DNBUCKET=0x5e -DNCHAIN=0x1
# RUN: llvm-readelf --hash-symbols %t7.2.o 2>&1 | FileCheck %s --check-prefix=ERR2 -DFILE=%t7.2.o
# ERR2: Symbol table of .hash for image:
# ERR2-NEXT: warning: '[[FILE]]': the hash table at offset 0x54 goes past the end of the file (0x1d4), nbucket = 94, nchain = 1{{$}}
# ERR2-NOT: {{.}}
## Case B.1: the hash table ends right before the EOF. We have a broken nchain
## field that has a value larger than the number of chains.
# RUN: yaml2obj --docnum=7 %s -o %t7.3.o -DNBUCKET=0x1 -DNCHAIN=0x5d
# RUN: llvm-readelf --hash-symbols %t7.3.o 2>&1 | \
# RUN: FileCheck %s --implicit-check-not="warning:" --check-prefix=NOERR2 -DFILE=%t7.3.o
# NOERR2: warning: '[[FILE]]': hash table nchain (93) differs from symbol count derived from SHT_DYNSYM section header (1)
# NOERR2: Symbol table of .hash for image:
# NOERR2-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
# NOERR2-NOT: {{.}}
## Case B.2: the hash table ends 1 byte past the EOF. We have a broken nchain
## field that has a value larger than the number of chains.
# RUN: yaml2obj --docnum=7 %s -o %t7.4.o -DNBUCKET=0x1 -DNCHAIN=0x5e
# RUN: llvm-readelf --hash-symbols %t7.4.o 2>&1 | FileCheck %s --check-prefix=ERR3 -DFILE=%t7.4.o
# ERR3: Symbol table of .hash for image:
# ERR3-NEXT: warning: '[[FILE]]': the hash table at offset 0x54 goes past the end of the file (0x1d4), nbucket = 1, nchain = 94{{$}}
# ERR3-NOT: {{.}}
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .hash
Type: SHT_HASH
Flags: [ SHF_ALLOC ]
Bucket: [ 0 ]
NBucket: [[NBUCKET]]
Chain: [ 0 ]
NChain: [[NCHAIN]]
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_WRITE, SHF_ALLOC ]
Entries:
- Tag: DT_HASH
Value: 0x0
- Tag: DT_NULL
Value: 0x0
DynamicSymbols: []
ProgramHeaders:
- Type: PT_LOAD
Sections:
- Section: .hash
- Section: .dynamic
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