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
141 lines
4.0 KiB
Plaintext
141 lines
4.0 KiB
Plaintext
# RUN: yaml2obj %s -o %t
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# RUN: llvm-objcopy --remove-section=.foo --strip-symbol=unused %t %t.out
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# RUN: llvm-readelf -Sr %t.out | FileCheck %s
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# CHECK: [Nr] Name Type Address Off Size ES Flg Lk Inf Al
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# CHECK-NEXT: [ 0] NULL 0000000000000000 000000 000000 00 0 0 0
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# CHECK-NEXT: [ 1] .text PROGBITS 0000000000000000 {{.*}} 000008 00 A 0 0 0
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# CHECK-NEXT: [ 2] .crel.text CREL 0000000000000000 {{.*}} 000022 00 5 1 0
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# CHECK-NEXT: [ 3] nonalloc PROGBITS 0000000000000000 {{.*}} 000030 00 0 0 0
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# CHECK-NEXT: [ 4] .crelnonalloc CREL 0000000000000000 {{.*}} 00000b 00 5 3 0
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# CHECK: Relocation section '.crel.text' at offset {{.*}} contains 4 entries:
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# CHECK-NEXT: Offset Info Type Symbol's Value Symbol's Name + Addend
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# CHECK-NEXT: 0000000000000001 {{.*}} R_X86_64_32 0000000000000000 g1 + 1
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# CHECK-NEXT: 0000000000000002 {{.*}} R_X86_64_64 0000000000000000 l1 + 2
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# CHECK-NEXT: 0000000000000000 {{.*}} R_X86_64_32S 0000000000000000 g1 - 1
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# CHECK-NEXT: 0000000000000004 {{.*}} R_X86_64_32S 0000000000000000 .text - 8000000000000000
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# CHECK-EMPTY:
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# CHECK-NEXT: Relocation section '.crelnonalloc' at offset {{.*}} contains 3 entries:
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# CHECK-NEXT: Offset Info Type Symbol's Value Symbol's Name + Addend
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# CHECK-NEXT: 0000000000000010 {{.*}} R_X86_64_64 0000000000000000 g1 + 1
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# CHECK-NEXT: 0000000000000020 {{.*}} R_X86_64_64 0000000000000000 g2 + 2
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# CHECK-NEXT: 0000000000000030 {{.*}} R_X86_64_64 0
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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: .foo
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Type: SHT_PROGBITS
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Flags: [SHF_ALLOC]
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- Name: .text
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Type: SHT_PROGBITS
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Content: "0000000000000000"
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Flags: [SHF_ALLOC]
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- Name: .crel.text
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Type: SHT_CREL
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Info: .text
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Link: .symtab
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Relocations:
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- Offset: 0x1
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Symbol: g1
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Type: R_X86_64_32
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Addend: 1
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- Offset: 0x2
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Symbol: l1
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Type: R_X86_64_64
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Addend: 2
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- Offset: 0x0
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Symbol: g1
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Type: R_X86_64_32S
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Addend: 0xffffffffffffffff
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- Offset: 0x4
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Symbol: .text
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Type: R_X86_64_32S
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Addend: 0x8000000000000000
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- Name: nonalloc
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Type: SHT_PROGBITS
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Size: 0x30
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- Name: .crelnonalloc
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Type: SHT_CREL
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Info: nonalloc
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Link: .symtab
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Relocations:
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- Offset: 0x10
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Symbol: g1
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Type: R_X86_64_64
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Addend: 1
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- Offset: 0x20
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Symbol: g2
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Type: R_X86_64_64
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Addend: 2
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- Offset: 0x30
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Symbol: 0
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Type: R_X86_64_64
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Symbols:
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- Name: unused
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Section: .text
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- Name: .text
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Type: STT_SECTION
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Section: .text
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- Name: l1
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- Name: g1
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Section: .text
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Value: 0x0
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Size: 4
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Binding: STB_GLOBAL
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- Name: g2
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Binding: STB_GLOBAL
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# RUN: yaml2obj --docnum=2 %s -o %t.32
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# RUN: llvm-objcopy %t.32 %t.32.out
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# RUN: llvm-readobj -r %t.32.out | FileCheck %s --check-prefix=CHECK2
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# CHECK2: Relocations [
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# CHECK2-NEXT: Section (2) .crel.text {
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# CHECK2-NEXT: 0x0 R_X86_64_32S g1 0xFFFFFFFF
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# CHECK2-NEXT: 0x4 R_X86_64_32S .text 0x80000000
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# CHECK2-NEXT: }
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# CHECK2-NEXT: ]
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--- !ELF
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FileHeader:
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Class: ELFCLASS32
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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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Content: "0000000000000000"
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Flags: [SHF_ALLOC]
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- Name: .crel.text
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Type: SHT_CREL
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Info: .text
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Link: .symtab
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Relocations:
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- Offset: 0x0
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Symbol: g1
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Type: R_X86_64_32S
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Addend: 0xffffffff
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- Offset: 0x4
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Symbol: .text
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Type: R_X86_64_32S
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Addend: 0x80000000
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Symbols:
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- Name: .text
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Type: STT_SECTION
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Section: .text
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- Name: g1
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Section: .text
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Size: 4
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Binding: STB_GLOBAL
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