1da4f47195
The address difference between two sections in a PT_LOAD is a constant. Consider a hypothetical case (pagesize can be very small, say, 4). ``` .text sh_addralign=4 .text.hot sh_addralign=16 ``` If we set p_align to 4, the PT_LOAD will be loaded at an address which is a multiple of 4. The address of .text.hot is guaranteed to be a multiple of 4, but not necessarily a multiple of 16. This patch deletes the constraint if (SHeader->sh_offset == PHeader.p_offset) Reviewed By: grimar, jhenderson Differential Revision: https://reviews.llvm.org/D67260 llvm-svn: 371501
57 lines
1.3 KiB
YAML
57 lines
1.3 KiB
YAML
## Test the p_align field of a program header can be set explicitly or inferred
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## from the maximum alignment of contained sections.
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## Explicit Align has priority over section alignments.
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# RUN: yaml2obj --docnum=1 %s -o %t
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# RUN: llvm-readobj -l %t | FileCheck %s
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# CHECK: ProgramHeader {
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# CHECK-NOT: ProgramHeader {
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# CHECK: Alignment: 16
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# CHECK-NEXT: }
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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_EXEC
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Machine: EM_NONE
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Sections:
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- Name: .tdata
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Type: SHT_PROGBITS
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AddressAlign: 4
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- Name: .tbss
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Type: SHT_NOBITS
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AddressAlign: 64
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ProgramHeaders:
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- Type: PT_TLS
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Align: 16
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Sections:
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- Section: .tdata
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- Section: .tbss
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## If Align is not specified, p_align is inferred from the maximum alignment
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## of contained sections.
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# RUN: yaml2obj --docnum=2 %s -o %t
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# RUN: llvm-readobj -l %t | 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_EXEC
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Machine: EM_NONE
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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AddressAlign: 4
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- Name: .text.hot
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Type: SHT_PROGBITS
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AddressAlign: 16
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ProgramHeaders:
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- Type: PT_LOAD
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Sections:
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- Section: .text
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- Section: .text.hot
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