1b704e889f
CREL is a compact relocation format for the ELF object file format. This patch adds integrated assembler support (using the RELA form) available with `llvm-mc -filetype=obj -crel a.s -o a.o`. A dependent patch will add `clang -c -Wa,--crel,--allow-experimental-crel`. Also add llvm-readobj support (for both REL and RELA forms) to facilitate testing the assembler. Additionally, yaml2obj gains support for the RELA form to aid testing with llvm-readobj. We temporarily assign the section type code 0x40000020 from the generic range to `SHT_CREL`. We avoided using `SHT_LLVM_` or `SHT_GNU_` to avoid code churn and maintain broader applicability for interested psABIs. Similarly, `DT_CREL` is temporarily 0x40000026. LLVM will change the code and break compatibility. This is not an issue if all relocatable files using CREL are regenerated (aka no prebuilt relocatable files). Link: https://discourse.llvm.org/t/rfc-crel-a-compact-relocation-format-for-elf/77600 Pull Request: https://github.com/llvm/llvm-project/pull/91280
185 lines
7.9 KiB
Plaintext
185 lines
7.9 KiB
Plaintext
## Test that we are able to print dynamic relocations with --dyn-relocations.
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## Check what we print when there are no dynamic relocations in an object.
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# RUN: yaml2obj --docnum=1 %s -o %t1
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# RUN: llvm-readobj --dyn-relocations %t1 2>&1 | FileCheck %s --check-prefix=LLVM-NONE
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# RUN: llvm-readelf --dyn-relocations %t1 2>&1 | FileCheck %s --implicit-check-not={{.}} --allow-empty
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# LLVM-NONE: Dynamic Relocations {
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# LLVM-NONE-NEXT: }
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# LLVM-NONE-NOT: {{.}}
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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_DYN
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## Check that we dump all possbile dynamic relocation sections.
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# RUN: yaml2obj --docnum=2 %s -o %t2.1
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# RUN: llvm-readobj --dyn-relocations %t2.1 2>&1 | \
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# RUN: FileCheck %s --implicit-check-not=warning: --check-prefix=LLVM-RELOCS
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# RUN: llvm-readelf --dyn-relocations %t2.1 2>&1 | \
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# RUN: FileCheck %s --implicit-check-not=warning: --strict-whitespace \
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# RUN: --match-full-lines --check-prefixes=GNU-RELOCS,GNU-PLTREL
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## 7 == DT_RELA.
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# RUN: yaml2obj --docnum=2 %s -DDTPLTREL=7 -DPLTTYPE=SHT_RELA -DPLTRELSZ=0x18 -o %t2.2
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# RUN: llvm-readobj --dyn-relocations %t2.2 2>&1 | \
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# RUN: FileCheck %s --implicit-check-not=warning: --check-prefix=LLVM-RELOCS
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# RUN: llvm-readelf --dyn-relocations %t2.2 2>&1 | \
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# RUN: FileCheck %s --implicit-check-not=warning: --strict-whitespace \
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# RUN: --match-full-lines --check-prefixes=GNU-RELOCS,GNU-PLTRELA
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# LLVM-RELOCS: Dynamic Relocations {
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# LLVM-RELOCS-NEXT: 0x8 R_X86_64_64 foo 0x0
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# LLVM-RELOCS-NEXT: 0x1 R_X86_64_NONE foo 0x0
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# LLVM-RELOCS-NEXT: 0x2 R_X86_64_NONE foo
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# LLVM-RELOCS-NEXT: 0x4 R_X86_64_RELATIVE -
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# LLVM-RELOCS-NEXT: 0x8 R_X86_64_NONE foo
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# LLVM-RELOCS-NEXT: }
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# GNU-RELOCS:'CREL' relocation section at offset 0xa8:
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# GNU-RELOCS-NEXT: Offset Info Type Symbol's Value Symbol's Name
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# GNU-RELOCS-NEXT:0000000000000008 0000000100000001 R_X86_64_64 0000000000000000 foo + 0
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# GNU-RELOCS-EMPTY:
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# GNU-RELOCS:'RELA' relocation section at offset 0x78 contains 24 bytes:
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# GNU-RELOCS-NEXT: Offset Info Type Symbol's Value Symbol's Name + Addend
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# GNU-RELOCS-NEXT:0000000000000001 0000000100000000 R_X86_64_NONE 0000000000000000 foo + 0
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# GNU-RELOCS-EMPTY:
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# GNU-RELOCS-NEXT:'REL' relocation section at offset 0x90 contains 16 bytes:
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# GNU-RELOCS-NEXT: Offset Info Type Symbol's Value Symbol's Name
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# GNU-RELOCS-NEXT:0000000000000002 0000000100000000 R_X86_64_NONE 0000000000000000 foo
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# GNU-RELOCS-EMPTY:
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# GNU-RELOCS-NEXT:'RELR' relocation section at offset 0xa0 contains 8 bytes:
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# GNU-RELOCS-NEXT: Offset Info Type Symbol's Value Symbol's Name
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# GNU-RELOCS-NEXT:0000000000000004 0000000000000008 R_X86_64_RELATIVE {{$}}
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# GNU-RELOCS-EMPTY:
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# GNU-PLTREL-NEXT:'PLT' relocation section at offset 0xac contains 16 bytes:
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# GNU-PLTREL-NEXT: Offset Info Type Symbol's Value Symbol's Name
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# GNU-PLTREL-NEXT:0000000000000008 0000000100000000 R_X86_64_NONE 0000000000000000 foo
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# GNU-PLTRELA-NEXT:'PLT' relocation section at offset 0xac contains 24 bytes:
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# GNU-PLTRELA-NEXT: Offset Info Type Symbol's Value Symbol's Name + Addend
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# GNU-PLTRELA-NEXT:0000000000000008 0000000100000000 R_X86_64_NONE 0000000000000000 foo + 0
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# GNU-RELOCS-EMPTY:
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# GNU-RELOCS-NOT:{{.}}
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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_DYN
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Machine: EM_X86_64
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Sections:
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- Name: .rela.dyn
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Type: SHT_RELA
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Relocations:
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- Type: R_X86_64_NONE
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Offset: 0x1
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Symbol: foo
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- Name: .rel.dyn
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Type: SHT_REL
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Relocations:
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- Type: R_X86_64_NONE
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Offset: 0x2
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Symbol: foo
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- Name: .relr.dyn
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Type: SHT_RELR
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Flags: [ SHF_ALLOC ]
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Entries: [ 0x0000000000000004 ]
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- Name: .crel.dyn
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Type: SHT_CREL
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Relocations:
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- Type: R_X86_64_64
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Offset: 0x8
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Symbol: foo
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- Name: .plt
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Type: [[PLTTYPE=SHT_REL]]
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Relocations:
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- Type: R_X86_64_NONE
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Offset: 0x8
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Symbol: foo
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- Name: .dynamic
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Type: SHT_DYNAMIC
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Entries:
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- Tag: DT_RELA
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Value: 0x0
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- Tag: DT_RELASZ
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Value: 0x18
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- Tag: DT_RELAENT
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Value: 0x18
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## 0x18 == offset of .rel.dyn in the segment.
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- Tag: DT_REL
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Value: 0x18
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- Tag: DT_RELSZ
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Value: 0x10
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- Tag: DT_RELENT
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Value: 0x10
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## 0x28 == offset of .relr.dyn section in the segment.
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- Tag: DT_RELR
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Value: 0x28
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- Tag: DT_RELRSZ
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Value: 0x8
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- Tag: DT_RELRENT
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Value: 0x8
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## 0x30 == offset of .crel.dyn section in the segment.
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- Tag: DT_CREL
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Value: 0x30
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## 0x34 == offset of .plt section in the segment.
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- Tag: DT_JMPREL
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Value: 0x34
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- Tag: DT_PLTREL
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Value: [[DTPLTREL=17]] ## 17 == DT_REL
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- Tag: DT_PLTRELSZ
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Value: [[PLTRELSZ=0x10]]
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- Tag: DT_NULL
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Value: 0x0
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Symbols:
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- Name: foo
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DynamicSymbols:
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- Name: foo
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ProgramHeaders:
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- Type: PT_LOAD
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FirstSec: .rela.dyn
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LastSec: .dynamic
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## Check we report a warning when the value of the DT_PLTREL dynamic tag is invalid.
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## We currently accept DT_RELA(7) and DT_REL(17) values. This test case uses 0xff.
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# RUN: yaml2obj --docnum=2 %s -DDTPLTREL=0xFF -o %t3
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# RUN: llvm-readobj --dyn-relocations %t3 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t3 --implicit-check-not=warning: --check-prefix=PLTRELUNKNOWN-LLVM
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# RUN: llvm-readelf --dyn-relocations %t3 2>&1 | \
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# RUN: FileCheck %s -DFILE=%t3 --implicit-check-not=warning: --check-prefix=PLTRELUNKNOWN-GNU
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# PLTRELUNKNOWN-LLVM: warning: '[[FILE]]': unknown DT_PLTREL value of 255
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# PLTRELUNKNOWN-LLVM: Dynamic Relocations {
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# PLTRELUNKNOWN-LLVM-NEXT: 0x8 R_X86_64_64 foo 0x0
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# PLTRELUNKNOWN-LLVM-NEXT: 0x1 R_X86_64_NONE foo 0x0
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# PLTRELUNKNOWN-LLVM-NEXT: 0x2 R_X86_64_NONE foo{{$}}
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# PLTRELUNKNOWN-LLVM-NEXT: 0x4 R_X86_64_RELATIVE -{{$}}
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# PLTRELUNKNOWN-LLVM-NEXT: warning: '[[FILE]]': invalid DT_PLTRELSZ value (0x10) or PLTREL entry size (0x0)
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# PLTRELUNKNOWN-LLVM-NEXT: }
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# PLTRELUNKNOWN-GNU: warning: '[[FILE]]': unknown DT_PLTREL value of 255
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# PLTRELUNKNOWN-GNU-EMPTY:
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# PLTRELUNKNOWN-GNU-NEXT: 'CREL' relocation section at offset 0xa8:
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# PLTRELUNKNOWN-GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name
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# PLTRELUNKNOWN-GNU-NEXT: 0000000000000008 0000000100000001 R_X86_64_64 0000000000000000 foo + 0
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# PLTRELUNKNOWN-GNU-EMPTY:
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# PLTRELUNKNOWN-GNU-NEXT: 'RELA' relocation section at offset 0x78 contains 24 bytes:
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# PLTRELUNKNOWN-GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name + Addend
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# PLTRELUNKNOWN-GNU-NEXT: 0000000000000001 0000000100000000 R_X86_64_NONE 0000000000000000 foo + 0
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# PLTRELUNKNOWN-GNU-EMPTY:
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# PLTRELUNKNOWN-GNU-NEXT: 'REL' relocation section at offset 0x90 contains 16 bytes:
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# PLTRELUNKNOWN-GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name
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# PLTRELUNKNOWN-GNU-NEXT: 0000000000000002 0000000100000000 R_X86_64_NONE 0000000000000000 foo
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# PLTRELUNKNOWN-GNU-EMPTY:
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# PLTRELUNKNOWN-GNU-NEXT: 'RELR' relocation section at offset 0xa0 contains 8 bytes:
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# PLTRELUNKNOWN-GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name
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# PLTRELUNKNOWN-GNU-NEXT: 0000000000000004 0000000000000008 R_X86_64_RELATIVE
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# PLTRELUNKNOWN-GNU-EMPTY:
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# PLTRELUNKNOWN-GNU-NEXT: 'PLT' relocation section at offset 0xac contains 16 bytes:
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# PLTRELUNKNOWN-GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name
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# PLTRELUNKNOWN-GNU-NEXT: warning: '[[FILE]]': invalid DT_PLTRELSZ value (0x10) or PLTREL entry size (0x0)
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