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19ab8f850f
Now the only method to configure ELF section's content and size is to assign a hexadecimal string to the `Content` field. Unfortunately this way is completely useless when you need to declare a really large section. To solve this problem this patch adds one more optional field `Size` to the `RawContentSection` structure. When yaml2obj generates an ELF file it uses the following algorithm: 1. If both `Content` and `Size` fields are missed create an empty section. 2. If only `Content` field is missed take section length from the `Size` field and fill the section by zero. 3. If only `Size` field is missed create a section using data from the `Content` field. 4. If both `Content` and `Size` fields are provided validate that the `Size` value is not less than size of `Content` data. Than take section length from the `Size`, fill beginning of the section by `Content` and the rest by zero. Examples -------- * Create a section 0x10000 bytes long filled by zero Name: .data Type: SHT_PROGBITS Flags: [ SHF_ALLOC ] Size: 0x10000 * Create a section 0x10000 bytes long starting from 'CA' 'FE' 'BA' 'BE' Name: .data Type: SHT_PROGBITS Flags: [ SHF_ALLOC ] Content: CAFEBABE Size: 0x10000 The patch reviewed by Michael Spencer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208995 91177308-0d34-0410-b5e6-96231b3b80d8
77 lines
2.1 KiB
YAML
77 lines
2.1 KiB
YAML
# RUN: yaml2obj -format=elf %s | llvm-readobj -sections -section-data - | FileCheck %s
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# RUN: yaml2obj -format=elf -o %t %s
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# RUN: llvm-readobj -sections -section-data %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_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: 0xCAFEBABE
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Link: .text # Doesn't make sense for SHT_PROGBITS, but good enough for test.
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Content: EBFE
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AddressAlign: 2
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- Name: .data
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC ]
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Address: 0xCAFECAFE
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Content: FEBF
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Size: 8
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AddressAlign: 2
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# CHECK: Section {
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# CHECK: Index: 0
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# CHECK: Type: SHT_NULL (0x0)
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#
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# CHECK: Section {
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# CHECK: Name: .text
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# CHECK: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x6)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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# CHECK-NEXT: SHF_EXECINSTR (0x4)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0xCAFEBABE
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# CHECK: Size: 2
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# Check that Link != 0.
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# CHECK: Link: {{[1-9][0-9]*}}
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# CHECK: AddressAlignment: 2
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# CHECK: SectionData (
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# CHECK-NEXT: 0000: EBFE
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# CHECK-NEXT: )
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#
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# CHECK: Section {
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# CHECK: Name: .data
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x2)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0xCAFECAFE
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# CHECK-NEXT: Offset: 0x1D0
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# CHECK-NEXT: Size: 8
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# CHECK-NEXT: Link: 0
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# CHECK-NEXT: Info: 0
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# CHECK-NEXT: AddressAlignment: 2
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: SectionData (
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# CHECK-NEXT: 0000: FEBF0000 00000000 |........|
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# CHECK-NEXT: )
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#
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# CHECK: Section {
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# CHECK: Name: .symtab (25)
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# CHECK: Type: SHT_SYMTAB (0x2)
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# CHECK: }
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# CHECK: Section {
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# CHECK: Name: .strtab (17)
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# CHECK: Type: SHT_STRTAB (0x3)
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# CHECK: }
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# CHECK: Section {
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# CHECK: Name: .shstrtab (7)
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# CHECK: Type: SHT_STRTAB (0x3)
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# CHECK: }
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