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dyn-symbols-size-from-hash-table.test
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dyn-symbols-size-from-hash-table.test
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## This test shows how llvm-readobj uses the hash table section to derive the
## size of a dynamic symbol table. This allows dumping of the dynamic symbol
## table in the event of an object without section headers.
## Case 1a) Table size is derived from hash table, with DT_SYMTAB before DT_HASH.
# RUN: yaml2obj --docnum=1 %s -o %t1a-64 -DBITS=64 \
# RUN: -DTAG1=DT_SYMTAB -DTAG2=DT_HASH -DVAL1=0x400 -DVAL2=0x600
# RUN: llvm-strip --strip-sections %t1a-64
# RUN: llvm-readobj --dyn-symbols %t1a-64 2>&1 | \
# RUN: FileCheck %s --check-prefixes=LLVM1,STRIP --implicit-check-not=warning:
# RUN: llvm-readelf --dyn-symbols %t1a-64 2>&1 | \
# RUN: FileCheck %s --check-prefixes=GNU1,GNU1-STRIP --implicit-check-not=warning:
# RUN: yaml2obj --docnum=1 %s -o %t1a-32 -DBITS=32 \
# RUN: -DTAG1=DT_SYMTAB -DTAG2=DT_HASH -DVAL1=0x400 -DVAL2=0x600
# RUN: llvm-strip --strip-sections %t1a-32
# RUN: llvm-readobj --dyn-symbols %t1a-32 2>&1 | \
# RUN: FileCheck %s --check-prefixes=LLVM1,STRIP --implicit-check-not=warning:
# RUN: llvm-readelf --dyn-symbols %t1a-32 2>&1 | \
# RUN: FileCheck %s --check-prefixes=GNU1,GNU1-STRIP --implicit-check-not=warning:
## 1b) Table size is derived from hash table, with DT_HASH before DT_SYMTAB.
## We don't bother testing 32 and 64-bit here. The above cases show that reading
## the nchain value is correct for all formats, and other tests show the basic
## printing behaviour.
# RUN: yaml2obj --docnum=1 %s -o %t1b-64 -DBITS=64 \
# RUN: -DTAG1=DT_HASH -DTAG2=DT_SYMTAB -DVAL1=0x600 -DVAL2=0x400
# RUN: llvm-strip --strip-sections %t1b-64
# RUN: llvm-readobj --dyn-symbols %t1b-64 2>&1 | \
# RUN: FileCheck %s --check-prefixes=LLVM1,STRIP --implicit-check-not=warning:
# RUN: llvm-readelf --dyn-symbols %t1b-64 2>&1 | \
# RUN: FileCheck %s --check-prefixes=GNU1,GNU1-STRIP --implicit-check-not=warning:
# LLVM1: DynamicSymbols [
# LLVM1-NEXT: Symbol {
# LLVM1-NEXT: Name: (0)
# LLVM1-NEXT: Value: 0x0
# LLVM1-NEXT: Size: 0
# LLVM1-NEXT: Binding: Local (0x0)
# LLVM1-NEXT: Type: None (0x0)
# LLVM1-NEXT: Other: 0
# LLVM1-NEXT: Section: Undefined (0x0)
# LLVM1-NEXT: }
# LLVM1-NEXT: Symbol {
# LLVM1-NEXT: Name: foo (5)
# LLVM1-NEXT: Value: 0x100
# LLVM1-NEXT: Size: 0
# LLVM1-NEXT: Binding: Local (0x0)
# LLVM1-NEXT: Type: Function (0x2)
# LLVM1-NEXT: Other: 0
# STRIP-NEXT: Section: <?> (0x1)
# NOSTRIP-NEXT: Section: .text (0x1)
# LLVM1-NEXT: }
# LLVM1-NEXT: Symbol {
# LLVM1-NEXT: Name: bar (1)
# LLVM1-NEXT: Value: 0x200
# LLVM1-NEXT: Size: 0
# LLVM1-NEXT: Binding: Local (0x0)
# LLVM1-NEXT: Type: Object (0x1)
# LLVM1-NEXT: Other: 0
# STRIP-NEXT: Section: <?> (0x2)
# NOSTRIP-NEXT: Section: .data (0x2)
# LLVM1-NEXT: }
# LLVM1-NEXT: ]
# GNU1-STRIP: Symbol table for image contains 3 entries:
# GNU1-NOSTRIP: Symbol table '.dynsym' contains 3 entries:
# GNU1-NEXT: Num: Value Size Type Bind Vis Ndx Name
# GNU1-NEXT: 0: {{0*}}00000000 0 NOTYPE LOCAL DEFAULT UND
# GNU1-NEXT: 1: {{0*}}00000100 0 FUNC LOCAL DEFAULT 1 foo
# GNU1-NEXT: 2: {{0*}}00000200 0 OBJECT LOCAL DEFAULT 2 bar
# GNU1-EMPTY:
--- !ELF
FileHeader:
Class: ELFCLASS[[BITS]]
Data: ELFDATA2LSB
Type: ET_DYN
Sections:
- Name: .text
Type: SHT_PROGBITS
- Name: .data
Type: SHT_PROGBITS
- Name: .dynsym
Type: SHT_DYNSYM
Flags: [ SHF_ALLOC ]
Address: 0x400
AddressAlign: 0x400
- Name: .hash
Type: SHT_HASH
Flags: [ SHF_ALLOC ]
Address: 0x600
AddressAlign: 0x200
Bucket: [ 1 ]
Chain: [ 1, 2, 3 ]
- Name: .dynstr
Type: SHT_STRTAB
Flags: [ SHF_ALLOC ]
Address: 0x800
AddressAlign: 0x200
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Address: 0xA00
AddressAlign: 0x200
Entries:
- Tag: DT_STRTAB
Value: 0x800
- Tag: DT_STRSZ
Value: 9
- Tag: [[TAG1]]
Value: [[VAL1]]
- Tag: [[TAG2]]
Value: [[VAL2]]
- Tag: DT_NULL
Value: 0
DynamicSymbols:
- Name: foo
Type: STT_FUNC
Section: .text
Value: 0x100
- Name: bar
Type: STT_OBJECT
Section: .data
Value: 0x200
ProgramHeaders:
- Type: PT_LOAD
VAddr: 0
Sections:
- Section: .text
- Section: .data
- Type: PT_LOAD
VAddr: 0x400
Sections:
- Section: .dynsym
- Section: .hash
- Section: .dynstr
- Section: .dynamic
- Type: PT_DYNAMIC
VAddr: 0xA00
Sections:
- Section: .dynamic
## Case 2: Table size from DT_HASH does not match size from section header.
# RUN: yaml2obj --docnum=2 %s -o %t2-smaller -DCHAIN="[1, 2]"
# RUN: llvm-readobj --dyn-symbols %t2-smaller 2>&1 | \
# RUN: FileCheck %s --check-prefixes=LLVM2,WARN \
# RUN: --implicit-check-not=warning: -DNCHAIN=2
# RUN: llvm-readelf --dyn-symbols %t2-smaller 2>&1 | \
# RUN: FileCheck %s --check-prefixes=GNU2,WARN \
# RUN: --implicit-check-not=warning: -DNCHAIN=2
# RUN: yaml2obj --docnum=2 %s -o %t2-larger -DCHAIN="[1, 2, 3, 4]"
# RUN: llvm-readobj --dyn-symbols %t2-larger 2>&1 | \
# RUN: FileCheck %s --check-prefixes=LLVM2,LLVM2-MORE,LLVM2-ALL,WARN \
# RUN: --implicit-check-not=warning: -DNCHAIN=4
# RUN: llvm-readelf --dyn-symbols %t2-larger 2>&1 | \
# RUN: FileCheck %s --check-prefixes=GNU2,GNU2-MORE,GNU2-ALL,WARN \
# RUN: --implicit-check-not=warning: -DNCHAIN=4
# WARN: warning: '{{.*}}2-{{.*}}': hash table nchain ([[NCHAIN]]) differs from symbol count derived from SHT_DYNSYM section header (3)
## Show we report a warning when the sh_entsize of the SHT_DYNSYM section is zero and therefore we are unable
## to derive the number of dynamic symbols from SHT_DYNSYM section header.
# RUN: yaml2obj --docnum=2 %s -o %t2-zero-entsize -DCHAIN="[1, 2, 3, 4]" -DENTSIZE=0
# RUN: llvm-readobj --dyn-symbols %t2-zero-entsize 2>&1 | \
# RUN: FileCheck %s -DFILE=%t2-zero-entsize --check-prefixes=LLVM2,LLVM2-MORE,LLVM2-ALL,WARN-ENTSIZE \
# RUN: --implicit-check-not=warning:
# RUN: llvm-readelf --dyn-symbols %t2-zero-entsize 2>&1 | \
# RUN: FileCheck %s -DFILE=%t2-zero-entsize --check-prefixes=GNU2,GNU2-MORE,GNU2-ALL,WARN-ENTSIZE \
# RUN: --implicit-check-not=warning: -DNCHAIN=4
## WARN-ENTSIZE: warning: '[[FILE]]': SHT_DYNSYM section has sh_entsize == 0
## Show there's no warning if the sizes match
# RUN: yaml2obj --docnum=2 %s -o %t2-same -DCHAIN="[1, 2, 3]"
# RUN: llvm-readobj --dyn-symbols %t2-same 2>&1 | \
# RUN: FileCheck %s --check-prefixes=LLVM2,LLVM2-MORE --implicit-check-not=warning:
# RUN: llvm-readelf --dyn-symbols %t2-same 2>&1 | \
# RUN: FileCheck %s --check-prefixes=GNU2,GNU2-MORE \
# RUN: --implicit-check-not=warning: -DNCHAIN=3
# LLVM2: DynamicSymbols [
# LLVM2-NEXT: Symbol {
# LLVM2-NEXT: Name: (0)
# LLVM2-NEXT: Value: 0x0
# LLVM2-NEXT: Size: 0
# LLVM2-NEXT: Binding: Local (0x0)
# LLVM2-NEXT: Type: None (0x0)
# LLVM2-NEXT: Other: 0
# LLVM2-NEXT: Section: Undefined (0x0)
# LLVM2-NEXT: }
# LLVM2-NEXT: Symbol {
# LLVM2-NEXT: Name: foo (9)
# LLVM2-NEXT: Value: 0x100
# LLVM2-NEXT: Size: 0
# LLVM2-NEXT: Binding: Local (0x0)
# LLVM2-NEXT: Type: Function (0x2)
# LLVM2-NEXT: Other: 0
# LLVM2-NEXT: Section: .text (0x1)
# LLVM2-NEXT: }
# LLVM2-MORE-NEXT: Symbol {
# LLVM2-MORE-NEXT: Name: bar (5)
# LLVM2-MORE-NEXT: Value: 0x200
# LLVM2-MORE-NEXT: Size: 0
# LLVM2-MORE-NEXT: Binding: Local (0x0)
# LLVM2-MORE-NEXT: Type: Object (0x1)
# LLVM2-MORE-NEXT: Other: 0
# LLVM2-MORE-NEXT: Section: .data (0x2)
# LLVM2-MORE-NEXT: }
# LLVM2-ALL-NEXT: Symbol {
# LLVM2-ALL-NEXT: Name: baz (1)
# LLVM2-ALL-NEXT: Value: 0x300
# LLVM2-ALL-NEXT: Size: 0
# LLVM2-ALL-NEXT: Binding: Local (0x0)
# LLVM2-ALL-NEXT: Type: Object (0x1)
# LLVM2-ALL-NEXT: Other: 0
# LLVM2-ALL-NEXT: Section: .data (0x2)
# LLVM2-ALL-NEXT: }
# LLVM2-NEXT: ]
# GNU2: Symbol table '.dynsym' contains [[NCHAIN]] entries:
# GNU2-NEXT: Num: Value Size Type Bind Vis Ndx Name
# GNU2-NEXT: 0: {{0*}}00000000 0 NOTYPE LOCAL DEFAULT UND
# GNU2-NEXT: 1: {{0*}}00000100 0 FUNC LOCAL DEFAULT 1 foo
# GNU2-MORE-NEXT: 2: {{0*}}00000200 0 OBJECT LOCAL DEFAULT 2 bar
# GNU2-ALL-NEXT: 3: {{0*}}00000300 0 OBJECT LOCAL DEFAULT 2 baz
# GNU2-EMPTY:
## In this YAML, we define 4 dynamic symbols (including the null symbol), but
## constrain the .dynsym section header to say there are only 3. This means that
## when a size of 4 is derived from the hash table, we still have a valid symbol
## to dump.
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Sections:
- Name: .text
Type: SHT_PROGBITS
- Name: .data
Type: SHT_PROGBITS
- Name: .dynsym
Type: SHT_DYNSYM
Flags: [ SHF_ALLOC ]
ShSize: 0x48
Address: 0x400
AddressAlign: 0x400
## 0x18 is the standard entsize value.
EntSize: [[ENTSIZE=0x18]]
- Name: .hash
Type: SHT_HASH
Flags: [ SHF_ALLOC ]
Address: 0x600
AddressAlign: 0x200
Bucket: [ 1 ]
Chain: [[CHAIN]]
- Name: .dynstr
Type: SHT_STRTAB
Flags: [ SHF_ALLOC ]
Address: 0x800
AddressAlign: 0x200
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Address: 0xA00
AddressAlign: 0x200
Entries:
- Tag: DT_SYMTAB
Value: 0x400
- Tag: DT_HASH
Value: 0x600
- Tag: DT_STRTAB
Value: 0x800
- Tag: DT_STRSZ
Value: 13
- Tag: DT_NULL
Value: 0
DynamicSymbols:
- Name: foo
Type: STT_FUNC
Section: .text
Value: 0x100
- Name: bar
Type: STT_OBJECT
Section: .data
Value: 0x200
- Name: baz
Type: STT_OBJECT
Section: .data
Value: 0x300
ProgramHeaders:
- Type: PT_LOAD
VAddr: 0
Sections:
- Section: .text
- Section: .data
- Type: PT_LOAD
VAddr: 0x400
Sections:
- Section: .dynsym
- Section: .hash
- Section: .dynstr
- Section: .dynamic
- Type: PT_DYNAMIC
VAddr: 0xA00
Sections:
- Section: .dynamic
## Case 3: DT_HASH is missing.
## Show that no warning occurs if there are section headers.
# RUN: yaml2obj --docnum=1 %s -o %t3 -DTAG1=DT_SYMTAB -DVAL1=0x400 -DTAG2=DT_NULL -DVAL2=0 -DBITS=64
# RUN: llvm-readobj --dyn-symbols %t3 2>&1 | \
# RUN: FileCheck %s --check-prefixes=LLVM1,NOSTRIP --implicit-check-not=warning:
# RUN: llvm-readelf --dyn-symbols %t3 2>&1 | \
# RUN: FileCheck %s --check-prefixes=GNU1,GNU1-NOSTRIP --implicit-check-not=warning:
## Show that size is treated as zero, if no section headers are present.
# RUN: llvm-strip --strip-sections %t3
# RUN: llvm-readobj --dyn-symbols %t3 2>&1 | \
# RUN: FileCheck %s --check-prefix=LLVM3 --implicit-check-not=warning:
# RUN: llvm-readelf --dyn-symbols %t3 2>&1 | \
# RUN: FileCheck %s --implicit-check-not={{.}} --allow-empty
# LLVM3: DynamicSymbols [
# LLVM3: ]
## Case 4: The size of the dynamic symbol table, inferred from the hash table, is broken.
## It is so large that symbol table goes past the end of the file. We have a dynamic
## relocation which refers to a symbol with an index that is also too large to be
## in the file. Check we report a warning when trying to dump this relocation.
# RUN: yaml2obj --docnum=3 %s -o %t4.1
## Remember the size of the output produced.
# RUN: wc -c %t4.1 > %t4.out.gnu.txt
# RUN: llvm-readelf --sections --dyn-relocations %t4.1 >> %t4.out.gnu.txt 2>&1
# RUN: FileCheck %s -DFILE=%t4.1 --input-file=%t4.out.gnu.txt --check-prefix=BROKEN-NCHAIN-GNU
# BROKEN-NCHAIN-GNU: [[#%u, FILESIZE:]]
# BROKEN-NCHAIN-GNU: warning: '[[FILE]]': the size (0x17ffffffe8) of the dynamic symbol table at 0x[[#%x, DYNSYMOFF:]], derived from the hash table, goes past the end of the file (0x[[#%x, FILESIZE]]) and will be ignored
# BROKEN-NCHAIN-GNU: [Nr] Name Type Address Off
# BROKEN-NCHAIN-GNU: [ 1] .rela.plt RELA 0000000000001000 0000[[#%x, RELAOFF:]]
# BROKEN-NCHAIN-GNU: [ 4] .dynsym DYNSYM 0000000000001078 0000[[#%x, DYNSYMOFF]]
# BROKEN-NCHAIN-GNU: 'PLT' relocation section at offset 0x[[#%x, RELAOFF]] contains 24 bytes:
# BROKEN-NCHAIN-GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name + Addend
# BROKEN-NCHAIN-GNU-NEXT: warning: '[[FILE]]': unable to get name of the dynamic symbol with index 4292739037: index is greater than or equal to the number of dynamic symbols (1)
# BROKEN-NCHAIN-GNU-NEXT: 0000000000000000 ffddffdd00000000 R_X86_64_NONE <corrupt> + 0
# RUN: wc -c %t4.1 > %t4.out.llvm.txt
# RUN: llvm-readobj --sections --dyn-relocations %t4.1 2>&1 >> %t4.out.llvm.txt 2>&1
# RUN: FileCheck %s -DFILE=%t4.1 --input-file=%t4.out.llvm.txt --check-prefix=BROKEN-NCHAIN-LLVM
# BROKEN-NCHAIN-LLVM: {{^}}[[#%u, FILESIZE:]]
# BROKEN-NCHAIN-LLVM: warning: '[[FILE]]': the size (0x17ffffffe8) of the dynamic symbol table at 0x[[#%x, DYNSYMOFF:]], derived from the hash table, goes past the end of the file (0x[[#%x, FILESIZE]]) and will be ignored
# BROKEN-NCHAIN-LLVM: Name: .dynsym
# BROKEN-NCHAIN-LLVM-NEXT: Type: SHT_DYNSYM
# BROKEN-NCHAIN-LLVM-NEXT: Flags [
# BROKEN-NCHAIN-LLVM-NEXT: SHF_ALLOC
# BROKEN-NCHAIN-LLVM-NEXT: ]
# BROKEN-NCHAIN-LLVM-NEXT: Address: 0x1078
# BROKEN-NCHAIN-LLVM-NEXT: Offset: 0x[[#%X, DYNSYMOFF]]
# BROKEN-NCHAIN-LLVM: Dynamic Relocations {
# BROKEN-NCHAIN-LLVM-NEXT: warning: '[[FILE]]': unable to get name of the dynamic symbol with index 4292739037: index is greater than or equal to the number of dynamic symbols (1)
# BROKEN-NCHAIN-LLVM-NEXT: 0x0 R_X86_64_NONE <corrupt> 0x0
# BROKEN-NCHAIN-LLVM-NEXT: }
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_X86_64
Sections:
- Name: .rela.plt
Type: SHT_RELA
Flags: [ SHF_ALLOC ]
Address: 0x1000
Relocations:
- Type: R_X86_64_NONE
Symbol: 0xFFDDFFDD
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Entries:
- Tag: DT_PLTRELSZ
Value: 0x18
- Tag: DT_JMPREL
## 0x1000 - PT_LOAD's p_vaddr (0x1000) == 0x0.
## 0x0 + PT_LOAD's p_offset (0x78) == .rela.plt section offset (0x78).
Value: 0x1000
- Tag: DT_PLTREL
Value: 0x7 ## 7 == DT_RELA
- Tag: DT_HASH
## 0x1068 - PT_LOAD's p_vaddr (0x1000) == 0x68.
## 0x68 + PT_LOAD's p_offset (0x78) == .hash section offset (0xE0).
Value: 0x1068
- Tag: DT_NULL
Value: 0x0
- Name: .hash
Type: SHT_HASH
Flags: [ SHF_ALLOC ]
Bucket: [ 0 ]
Chain: [ 0 ]
NChain: 0xFFFFFFFF
DynamicSymbols: []
ProgramHeaders:
- Type: PT_LOAD
Sections:
- Section: .rela.plt
- Section: .dynamic
- Section: .hash
VAddr: 0x1000