xref: /llvm-project/llvm/test/tools/llvm-objcopy/ELF/add-symbol-no-symtab.test (revision d8e65585f7c7cddd63920d122a9e6368d91c9389)

## Test --add-symbol creates .symtab if it does not exist.

# RUN: yaml2obj --docnum=1 %s -o %t

## If a non-SHF_ALLOC SHT_STRTAB exists but SHT_SYMTAB does not, create .symtab
## and set its sh_link to the SHT_STRTAB.
# RUN: llvm-objcopy --remove-section=.symtab %t %t.no.symtab
# RUN: llvm-objcopy --add-symbol='abs1=1' %t.no.symtab %t.add.both
# RUN: llvm-readobj -S %t.add.both | FileCheck --check-prefix=SEC %s
# RUN: llvm-readelf -s %t.add.both | FileCheck %s

# SEC:      Index: 1
# SEC-NEXT: Name: .strtab
# SEC-NEXT: Type: SHT_STRTAB
# SEC:      Index: 2
# SEC-NEXT: Name: .shstrtab
# SEC-NEXT: Type: SHT_STRTAB
# SEC:      Index: 3
# SEC-NEXT: Name: .symtab
# SEC-NEXT: Type: SHT_SYMTAB
# SEC-NOT:  }
# SEC:      Link: 1

# CHECK:      0: 0000000000000000 0 NOTYPE LOCAL  DEFAULT UND
# CHECK-NEXT: 1: 0000000000000001 0 NOTYPE GLOBAL DEFAULT ABS abs1

## Don't create .symtab if --add-symbol is not specified.
# RUN: llvm-objcopy --remove-section=.symtab --remove-section=.strtab %t %t.no
# RUN: llvm-objcopy %t.no %t.nop
# RUN: llvm-readobj -S %t.nop | FileCheck --implicit-check-not=.symtab --implicit-check-not=.strtab /dev/null

## Reuse the existing .shstrtab (section names) for symbol names.
## This may look strange but it works.
# RUN: llvm-objcopy --add-symbol='abs1=1' %t.no %t.add.symtab
# RUN: llvm-readobj -S %t.add.symtab | FileCheck --check-prefix=SEC2 %s --implicit-check-not=.strtab
# RUN: llvm-readelf -s %t.add.symtab | FileCheck %s

# SEC2:      Index: 1
# SEC2-NEXT: Name: .shstrtab
# SEC2-NEXT: Type: SHT_STRTAB
# SEC2:      Index: 2
# SEC2-NEXT: Name: .symtab
# SEC2-NEXT: Type: SHT_SYMTAB
# SEC2-NOT:  }
# SEC2:      Link: 1

--- !ELF
FileHeader:
  Class:   ELFCLASS64
  Data:    ELFDATA2LSB
  Type:    ET_REL
  Machine: EM_X86_64
Sections:
  - Name: .strtab
    Type: SHT_STRTAB
  - Name: .shstrtab
    Type: SHT_STRTAB
Symbols: []
...

## Check that we prefer the string table that is not the section header string table.
# RUN: yaml2obj --docnum=2 %s -o %t2
# RUN: llvm-objcopy --remove-section=.symtab --remove-section=.strtab %t2 %t2.no
# RUN: llvm-objcopy --add-symbol='abs1=1' %t2.no %t2.add.symtab
# RUN: llvm-readobj -S %t2.add.symtab | FileCheck --check-prefix=SEC2 %s
# RUN: llvm-readelf -s %t2.add.symtab | FileCheck %s

--- !ELF
FileHeader:
  Class:   ELFCLASS64
  Data:    ELFDATA2LSB
  Type:    ET_REL
  Machine: EM_X86_64
Sections:
  # .shstrtab is reordered before .strtab
  - Name: .shstrtab
    Type: SHT_STRTAB
  - Name: .strtab
    Type: SHT_STRTAB
Symbols: []
...

## Check the created .symtab does not link to .dynstr (SHF_ALLOC).
# RUN: yaml2obj --docnum=3 %s -o %t3
# RUN: llvm-objcopy --remove-section=.symtab --remove-section=.strtab %t3 %t3.no
# RUN: llvm-objcopy --add-symbol='abs1=1' %t3.no %t3.not.dynstr
# RUN: llvm-readobj -S %t3.not.dynstr | FileCheck --check-prefix=SEC3 %s

# SEC3:      Index: 3
# SEC3-NEXT: Name: .shstrtab
# SEC3-NEXT: Type: SHT_STRTAB
# SEC3:      Name: .symtab
# SEC3-NEXT: Type: SHT_SYMTAB
# SEC3-NOT:  }
# SEC3:      Link: 3

--- !ELF
FileHeader:
  Class:   ELFCLASS64
  Data:    ELFDATA2LSB
  Type:    ET_DYN
  Machine: EM_X86_64
DynamicSymbols:
  - Name:    dummy
    Binding: STB_GLOBAL
Symbols: []
...

## Check the created .symtab is correct when there are program headers.
# RUN: yaml2obj --docnum=4 %s -o %t4
# RUN: llvm-objcopy %t4 %t4.add --add-symbol foo=1234
# RUN: llvm-readelf -s %t4.add | FileCheck --check-prefix=SEC4 %s

# SEC4:      0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT   UND
# SEC4-NEXT: 1: 00000000000004d2     0 NOTYPE  GLOBAL DEFAULT   ABS foo

--- !ELF
FileHeader:
  Class:   ELFCLASS64
  Data:    ELFDATA2LSB
  Type:    ET_DYN
  Machine: EM_X86_64
Sections:
  - Name:    .foo
    Type:    SHT_PROGBITS
ProgramHeaders:
  - Type:     PT_LOAD
    FirstSec: .foo
    LastSec:  .foo
...