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The CIE pointer field of an FDE record contains an offset to a corresponding CIE record. In object files, this value comes with relocation because the value has to be fixed when a linker combines the final section from multiple sources. In most object files there is only one CIE record at offset 0 of the .debug_frame section, so reading a relocated or a raw value makes no difference. However, in partially linked object files there are multiple CIE records and the relocations should be applied to recover the right offset value. Differential Revision: https://reviews.llvm.org/D74612
42 lines
1.4 KiB
Plaintext
42 lines
1.4 KiB
Plaintext
# RUN: yaml2obj %s -o - | \
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# RUN: llvm-dwarfdump -debug-frame - | \
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# RUN: FileCheck %s
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## This checks that we resolve relocations when reading CIE pointers.
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## The second FDE references the second CIE. The value for the CIE pointer
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## field in the raw section data is 0, thus, to recover the real reference,
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## it is required to read the addend from the corresponding RELA relocation.
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# CHECK: .debug_frame contents:
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# CHECK: 00000000 0000000c ffffffff CIE
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# CHECK: 00000010 00000014 00000000 FDE cie=00000000 pc=00000000...00000001
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# CHECK: 00000028 0000000c ffffffff CIE
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# CHECK: 00000038 00000014 00000028 FDE cie=00000028 pc=00000010...00000011
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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: .debug_frame
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Type: SHT_PROGBITS
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Content: 0C000000FFFFFFFF02000178100000001400000000000000000000000000000001000000000000000C000000FFFFFFFF0200017810000000140000000000000010000000000000000100000000000000
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- Name: .rela.debug_frame
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Type: SHT_RELA
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Info: .debug_frame
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Relocations:
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- Offset: 0x0000000000000014
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Symbol: .debug_frame
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Type: R_X86_64_32
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- Offset: 0x000000000000003C
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Symbol: .debug_frame
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Type: R_X86_64_32
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Addend: 0x28
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Symbols:
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- Name: .debug_frame
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Type: STT_SECTION
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Section: .debug_frame
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...
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