a7a447be0f
Imagine we have a YAML declaration of few sections: `foo1`, `<unnamed 2>`, `foo3`, `foo4`. To put them into segment we can do (1*): ``` Sections: - Section: foo1 - Section: foo4 ``` or we can use (2*): ``` Sections: - Section: foo1 - Section: foo3 - Section: foo4 ``` or (3*) : ``` Sections: - Section: foo1 ## "(index 2)" here is a name that we automatically created for a unnamed section. - Section: (index 2) - Section: foo3 - Section: foo4 ``` It looks really confusing that we don't have to list all of sections. At first I've tried to make this rule stricter and report an error when there is a gap (i.e. when a section is included into segment, but not listed explicitly). This did not work perfect, because such approach conflicts with unnamed sections/fills (see (3*)). This patch drops "Sections" key and introduces 2 keys instead: `FirstSec` and `LastSec`. Both are optional. Differential revision: https://reviews.llvm.org/D90458
130 lines
3.9 KiB
Plaintext
130 lines
3.9 KiB
Plaintext
# This test is checking to ensure that if a section is removed in the presence
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# of a segment that the segment maintains its shape and properties and that any
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# section inside that segment maintains the relative positioning it had in the
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# segment. Note worthy is that .text3 keeps its offset despite it being
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# possible to place it after .text when .text2 is removed.
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# RUN: yaml2obj %s -o %t
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# RUN: llvm-objcopy -R .text2 %t %t2
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# RUN: llvm-readobj --file-headers --program-headers --sections %t2 | FileCheck %s
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# RUN: od -t x1 -j 8192 -N 4 %t2 | FileCheck %s --check-prefix=DATA
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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_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: 0x1000
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Size: 4096
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- Name: .text2
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Address: 0x2000
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AddressAlign: 0x1000
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Size: 4096
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Content: "DEADBEEF"
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- Name: .text3
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Address: 0x3000
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AddressAlign: 0x1000
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Size: 4096
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ProgramHeaders:
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- Type: PT_LOAD
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Flags: [ PF_X, PF_R ]
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FirstSec: .text
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LastSec: .text3
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## TODO (grimar): without the following line (i.e. without an empty symbol table),
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## llvm-objcopy adds an empty .strtab section. It doesn't look correct.
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Symbols: []
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# Make sure that when we remove a section we overwrite it with zeros
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# DATA: {{^[^[:blank:]]+}} 00 00 00 00
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#CHECK: SectionHeaderCount: 4
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# CHECK: Sections [
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# CHECK: Section {
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# CHECK-NEXT: Index: 0
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Type: SHT_NULL (0x0)
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0x0
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# CHECK-NEXT: Offset:
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# CHECK-NEXT: Size:
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# CHECK-NEXT: Link: 0
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# CHECK-NEXT: Info: 0
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# CHECK-NEXT: AddressAlignment: 0
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 1
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# CHECK-NEXT: Name: .text
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# CHECK-NEXT: Type: SHT_PROGBITS
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# CHECK-NEXT: Flags [
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# CHECK-NEXT: SHF_ALLOC
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# CHECK-NEXT: SHF_EXECINSTR
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0x1000
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# CHECK-NEXT: Offset: 0x1000
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# CHECK-NEXT: Size:
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# CHECK-NEXT: Link: 0
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# CHECK-NEXT: Info: 0
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# CHECK-NEXT: AddressAlignment: 4096
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 2
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# CHECK-NEXT: Name: .text3
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [
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# CHECK-NEXT: SHF_ALLOC
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# CHECK-NEXT: SHF_EXECINSTR
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0x3000
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# CHECK-NEXT: Offset: 0x3000
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# CHECK-NEXT: Size:
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# CHECK-NEXT: Link: 0
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# CHECK-NEXT: Info: 0
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# CHECK-NEXT: AddressAlignment: 4096
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 3
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# CHECK-NEXT: Name: .shstrtab
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# CHECK-NEXT: Type: SHT_STRTAB (0x3)
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0x0
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# CHECK-NEXT: Offset:
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# CHECK-NEXT: Size:
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# CHECK-NEXT: Link: 0
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# CHECK-NEXT: Info: 0
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# CHECK-NEXT: AddressAlignment: 1
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: ]
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#CHECK: ProgramHeaders [
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#CHECK-NEXT: ProgramHeader {
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#CHECK-NEXT: Type: PT_LOAD (0x1)
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#CHECK-NEXT: Offset: 0x1000
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#CHECK-NEXT: VirtualAddress: 0x0
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#CHECK-NEXT: PhysicalAddress: 0x0
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#CHECK-NEXT: FileSize: 12288
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#CHECK-NEXT: MemSize: 12288
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#CHECK-NEXT: Flags [ (0x5)
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#CHECK-NEXT: PF_R (0x4)
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#CHECK-NEXT: PF_X (0x1)
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#CHECK-NEXT: ]
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#CHECK-NEXT: Alignment: 4096
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#CHECK-NEXT: }
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#CHECK-NEXT:]
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