9bb4cd5977
llvm-objcopy may modify the symbol table and need to rewrite relocations. For CREL, while we can reuse the decoder from #91280, we need an encoder to support CREL. Since MC/ELFObjectWriter.cpp has an existing encoder, and MC is at a lower layer than Object, extract the encoder to a new header file llvm/MC/MCELFExtras.h. Link: https://discourse.llvm.org/t/rfc-crel-a-compact-relocation-format-for-elf/77600 Pull Request: https://github.com/llvm/llvm-project/pull/97521
55 lines
2.1 KiB
Plaintext
55 lines
2.1 KiB
Plaintext
# RUN: yaml2obj %s -o %t
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# RUN: not llvm-objcopy -R .symtab %t %t2 2>&1 >/dev/null | FileCheck %s --check-prefix=ERR1 -DINPUT=%t
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# RUN: cp %t %t3
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# RUN: not llvm-strip --no-strip-all -R .symtab %t3 2>&1 >/dev/null | FileCheck %s --check-prefix=ERR2 -DINPUT=%t3
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# RUN: yaml2obj -DTYPE=SHT_CREL %s -o %t.crel
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# RUN: not llvm-objcopy -R .symtab %t.crel %t2.crel 2>&1 >/dev/null | FileCheck %s --check-prefix=ERR1 -DINPUT=%t.crel
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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_REL
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Machine: EM_X86_64
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Address: 0x1000
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AddressAlign: 0x0000000000000010
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Content: "0000000000000000"
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- Name: .rel.text
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Type: [[TYPE=SHT_REL]]
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Link: .symtab
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Info: .text
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Relocations:
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- Offset: 0x1000
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Symbol: foo
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Type: R_X86_64_PC32
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Symbols:
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- Name: foo
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Type: STT_FUNC
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Size: 4
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Binding: STB_GLOBAL
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# ERR1: error: '[[INPUT]]': symbol table '.symtab' cannot be removed because it is referenced by the relocation section '.rel.text'
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# ERR2: error: '[[INPUT]]': symbol table '.symtab' cannot be removed because it is referenced by the relocation section '.rel.text'
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# RUN: llvm-objcopy --allow-broken-links -R .symtab %t %t4
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# RUN: llvm-readobj --sections %t4 | FileCheck %s --check-prefix=SECTIONS --implicit-check-not=.symtab
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# RUN: cp %t %t5
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# RUN: llvm-strip --no-strip-all --allow-broken-links -R .symtab %t5
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# RUN: llvm-readobj --sections %t5 | FileCheck %s --check-prefix=SECTIONS --implicit-check-not=.symtab
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# RUN: llvm-objcopy --allow-broken-links -R .symtab %t.crel %t4.crel
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# RUN: llvm-readobj --sections %t4.crel | FileCheck %s --check-prefix=SECTIONS --implicit-check-not=.symtab
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# RUN: cp %t.crel %t5.crel
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# RUN: llvm-strip --no-strip-all --allow-broken-links -R .symtab %t5.crel
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# RUN: llvm-readobj --sections %t5.crel | FileCheck %s --check-prefix=SECTIONS --implicit-check-not=.symtab
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# SECTIONS: Name: .rel.text
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# SECTIONS: Link
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# SECTIONS-SAME: : 0
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