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c38aa8169e
This patch adds initial support for reading dynamic symbols from ELF binaries. Currently, STT_NOTYPE, STT_OBJECT, STT_FUNC, and STT_TLS are explicitly supported. Other symbol types are mapped to ELFSymbolType::Unknown to improve signal/noise ratio. Symbols must meet two criteria to be read into in an ELFStub: - The symbol's binding must be STB_GLOBAL or STB_WEAK. - The symbol's visibility must be STV_DEFAULT or STV_PROTECTED. This filters out symbols that aren't of interest during compile-time linking against a shared object. This change uses DT_HASH and DT_GNU_HASH to determine the size of .dynsym. Using hash tables to determine the number of symbols in .dynsym allows llvm-elfabi to work on binaries without relying on section headers. Differential Revision: https://reviews.llvm.org/D56031 llvm-svn: 352121
50 lines
1.3 KiB
Plaintext
50 lines
1.3 KiB
Plaintext
# RUN: yaml2obj %s > %t
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# RUN: llvm-elfabi --elf %t --emit-tbe=- --soname=best.so | FileCheck %s
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!ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_DYN
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Machine: EM_AARCH64
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Sections:
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- Name: .dynstr
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Type: SHT_STRTAB
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Flags: [ SHF_ALLOC ]
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Address: 0x0000
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Content: "00"
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- Name: .dynamic
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Type: SHT_DYNAMIC
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Flags: [ SHF_ALLOC ]
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Address: 0x0008
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AddressAlign: 8
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Content: "0a000000000000000100000000000000050000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000"
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# DT_STRSZ 1 (0x1)
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# DT_STRTAB 0x0
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# DT_SYMTAB 0x0
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# DT_NULL 0x0
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Size: 64
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Link: .dynstr
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ProgramHeaders:
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- Type: PT_LOAD
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Flags: [ PF_R ]
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VAddr: 0x0000
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PAddr: 0x0000
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Align: 8
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Sections:
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- Section: .dynstr
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- Section: .dynamic
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- Type: PT_DYNAMIC
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Flags: [ PF_X, PF_R ]
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VAddr: 0x0008
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PAddr: 0x0008
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Sections:
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- Section: .dynamic
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# CHECK: --- !tapi-tbe
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# CHECK-NEXT: TbeVersion: {{[1-9]\d*\.(0|([1-9]\d*))}}
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# CHECK-NEXT: SoName: best.so{{$}}
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# CHECK-NEXT: Arch: AArch64
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# CHECK-NEXT: Symbols: {}
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# CHECK-NEXT: ...
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