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clang-p2996/llvm/test/tools/llvm-readobj/ELF/crel.test
Fangrui Song 1b704e889f [MC,llvm-readobj,yaml2obj] Support CREL relocation format 
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
2024-07-01 10:32:02 -07:00

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# RUN: yaml2obj --docnum=1 %s -o %t
# RUN: llvm-readobj -r %t | FileCheck %s --check-prefix=LLVM --match-full-lines
# RUN: llvm-readelf -r %t | FileCheck %s --check-prefix=GNU --match-full-lines
# LLVM: Relocations [
# LLVM-NEXT: Section ([[#]]) .crel.text {
# LLVM-NEXT: 0x1 R_X86_64_32 g1 0x1
# LLVM-NEXT: 0x2 R_X86_64_64 l1 0x2
# LLVM-NEXT: 0x0 R_X86_64_32S g1 0xFFFFFFFFFFFFFFFF
# LLVM-NEXT: 0x4 R_X86_64_32S .text 0x8000000000000000
# LLVM-NEXT: }
# LLVM-NEXT: Section ([[#]]) .crelnonalloc {
# LLVM-NEXT: 0x10 R_X86_64_64 g1 0x1
# LLVM-NEXT: 0x20 R_X86_64_64 g2 0x2
# LLVM-NEXT: }
# LLVM-NEXT: ]
# GNU: Relocation section '.crel.text' at offset 0x48 contains 4 entries:
# GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name + Addend
# GNU-NEXT: 0000000000000001 000000030000000a R_X86_64_32 0000000000000000 g1 + 1
# GNU-NEXT: 0000000000000002 0000000200000001 R_X86_64_64 0000000000000000 l1 + 2
# GNU-NEXT: 0000000000000000 000000030000000b R_X86_64_32S 0000000000000000 g1 - 1
# GNU-NEXT: 0000000000000004 000000010000000b R_X86_64_32S 0000000000000000 .text - 8000000000000000
# GNU-EMPTY:
# GNU-NEXT: Relocation section '.crelnonalloc' at offset 0xa2 contains 2 entries:
# GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name + Addend
# GNU-NEXT: 0000000000000010 0000000300000001 R_X86_64_64 0000000000000000 g1 + 1
# GNU-NEXT: 0000000000000020 0000000400000001 R_X86_64_64 0000000000000000 g2 + 2
--- !ELF
FileHeader: !FileHeader
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .text
Type: SHT_PROGBITS
Content: "0000000000000000"
Flags: [SHF_ALLOC]
- Name: .crel.text
Type: SHT_CREL
Info: .text
Link: .symtab
Relocations:
- Offset: 0x1
Symbol: g1
Type: R_X86_64_32
Addend: 1
- Offset: 0x2
Symbol: l1
Type: R_X86_64_64
Addend: 2
- Offset: 0x0
Symbol: g1
Type: R_X86_64_32S
Addend: 0xffffffffffffffff
- Offset: 0x4
Symbol: .text
Type: R_X86_64_32S
Addend: 0x8000000000000000
- Name: nonalloc
Type: SHT_PROGBITS
Size: 0x30
- Name: .crelnonalloc
Type: SHT_CREL
Info: nonalloc
Link: .symtab
Relocations:
- Offset: 0x10
Symbol: g1
Type: R_X86_64_64
Addend: 1
- Offset: 0x20
Symbol: g2
Type: R_X86_64_64
Addend: 2
Symbols:
- Name: .text
Type: STT_SECTION
Section: .text
- Name: l1
- Name: g1
Section: .text
Value: 0x0
Size: 4
Binding: STB_GLOBAL
- Name: g2
Binding: STB_GLOBAL
## Check relocation formatting on ELFCLASS32 as well.
# RUN: yaml2obj --docnum=2 %s -o %t2
# RUN: llvm-readobj -r %t2 | FileCheck %s --check-prefix=LLVM2 --match-full-lines
# RUN: llvm-readelf -r %t2 | FileCheck %s --check-prefix=GNU2 --match-full-lines
# LLVM2: Relocations [
# LLVM2-NEXT: Section (2) .crel.text {
# LLVM2-NEXT: 0x8 R_386_PC32 l1 0x1
# LLVM2-NEXT: 0x4 R_386_32 g1 0x0
# LLVM2-NEXT: }
# LLVM2-NEXT: ]
# GNU2: Relocation section '.crel.text' at offset {{.*}} contains 2 entries:
# GNU2-NEXT: Offset Info Type Sym. Value Symbol's Name + Addend
# GNU2-NEXT: 00000008 00000102 R_386_PC32 00000000 l1 + 1
# GNU2-NEXT: 00000004 00000201 R_386_32 00000000 g1 + 0
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_386
Sections:
- Name: .text
Type: SHT_PROGBITS
Size: 0x10
- Name: .crel.text
Type: SHT_CREL
Info: .text
Link: .symtab
Relocations:
- Offset: 0x8
Symbol: l1
Type: R_386_PC32
Addend: 1
- Offset: 0x4
Symbol: g1
Type: R_386_32
Symbols:
- Name: l1
- Name: g1
Binding: STB_GLOBAL
## Check CREL with implicit addends.
# RUN: yaml2obj --docnum=3 %s -o %t3
# RUN: llvm-readobj -r %t3 | FileCheck %s --check-prefix=LLVM3 --match-full-lines
# RUN: llvm-readelf -r %t3 | FileCheck %s --check-prefix=GNU3 --match-full-lines
# LLVM3: Relocations [
# LLVM3-NEXT: Section (3) .crel.data {
# LLVM3-NEXT: 0x1F R_X86_64_32 g1
# LLVM3-NEXT: 0x3F R_X86_64_64 g1
# LLVM3-NEXT: 0x0 R_X86_64_32S l1
# LLVM3-NEXT: }
# LLVM3-NEXT: ]
# GNU3: Relocation section '.crel.data' at offset {{.*}} contains 3 entries:
# GNU3-NEXT: Offset Info Type Symbol's Value Symbol's Name
# GNU3-NEXT: 000000000000001f 000000030000000a R_X86_64_32 0000000000000000 g1
# GNU3-NEXT: 000000000000003f 0000000300000001 R_X86_64_64 0000000000000000 g1
# GNU3-NEXT: 0000000000000000 000000020000000b R_X86_64_32S 0000000000000000 l1
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .text
Type: SHT_PROGBITS
- Name: .data
Type: SHT_PROGBITS
- Name: .crel.data
Type: SHT_CREL
Flags: [ SHF_INFO_LINK ]
Link: .symtab
Info: .data
Content: 187f030a82017787feffffffffffffff077f0a
Symbols:
- Name: .text
Type: STT_SECTION
Section: .text
- Name: l1
Section: .text
- Name: g1
Section: .text
Binding: STB_GLOBAL
## Test errors. See also relocation-errors.test.
# RUN: yaml2obj --docnum=4 %s -o %t.err
# RUN: llvm-readobj -r %t.err 2>&1 | FileCheck %s --check-prefix=ERR-LLVM -DFILE=%t.err
# RUN: llvm-readelf -r %t.err 2>&1 | FileCheck %s --check-prefix=ERR-GNU -DFILE=%t.err
# ERR-LLVM: Section ([[#]]) .crel.data {
# ERR-LLVM-NEXT: warning: '[[FILE]]': unable to read relocations from SHT_CREL section with index 3: unable to decode LEB128 at offset 0x00000000: malformed uleb128, extends past end
# ERR-LLVM-NEXT: }
# ERR-GNU: warning: '[[FILE]]': unable to get the number of relocations in SHT_CREL section with index 3: unable to decode LEB128 at offset 0x00000000: malformed uleb128, extends past end
# ERR-GNU-EMPTY:
# ERR-GNU-NEXT: Relocation section '.crel.data' at offset 0x40 contains <?> entries:
# ERR-GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name
# ERR-GNU-NOT: {{.}}
# RUN: yaml2obj --docnum=4 -DCONTENT=08 %s -o %t.err2
# RUN: llvm-readobj -r %t.err2 2>&1 | FileCheck %s --check-prefix=ERR2-LLVM -DFILE=%t.err2
# RUN: llvm-readelf -r %t.err2 2>&1 | FileCheck %s --check-prefix=ERR2-GNU -DFILE=%t.err2
# ERR2-LLVM: Section ([[#]]) .crel.data {
# ERR2-LLVM-NEXT: warning: '[[FILE]]': unable to read relocations from SHT_CREL section with index 3: unexpected end of data at offset 0x1 while reading [0x1, 0x2)
# ERR2-LLVM-NEXT: }
# ERR2-GNU: Relocation section '.crel.data' at offset 0x40 contains 1 entries:
# ERR2-GNU-NEXT: Offset Info Type Symbol's Value Symbol's Name
# ERR2-GNU: warning: '[[FILE]]': unable to read relocations from SHT_CREL section with index 3: unexpected end of data at offset 0x1 while reading [0x1, 0x2)
# ERR2-GNU-NOT: {{.}}
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .text
Type: SHT_PROGBITS
- Name: .data
Type: SHT_PROGBITS
- Name: .crel.data
Type: SHT_CREL
Flags: []
Link: .symtab
Info: .data
Content: [[CONTENT=""]]
Symbols:
- Name: .text
Type: STT_SECTION
Section: .text
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