3da3f06dd3
Summary: This patch adds a ".comment" section to an output. The comment section contains the linker's version string. You can now find out whether a binary is created by LLD or not using objdump command like this. $ objdump -s -j .comment foo foo: file format elf64-x86-64 Contents of section .comment: 0000 00474343 3a202855 62756e74 7520342e .GCC: (Ubuntu 4. 0010 382e342d 32756275 6e747531 7e31342e 8.4-2ubuntu1~14. ... 00c0 766d2f74 72756e6b 20323835 38343629 vm/trunk 285846) 00d0 004c696e 6b65723a 204c4c44 20342e30 .Linker: LLD 4.0 00e0 2e302028 7472756e 6b203238 36343036 .0 (trunk 286406 00f0 2900 ). Compilers emits .comment section as well, so the output contains both compiler and linker information. Alternative considered: I first tried to add a SHT_NOTE section because GNU gold does that. A NOTE section starts with a header which contains content type. It turned out that ld.gold sets type NT_GNU_GOLD_VERSION to their NOTE section. So the NOTE type is only for GNU gold (surprise!) Next, I tried to create ".linker-version" section. However, it seems that reusing the existing ".comment" section is better because 1) other tools already know about .comment section and is able to strip it and 2) the result contans not only linker info but also compiler info. Differential Revision: https://reviews.llvm.org/D26487 llvm-svn: 286496
318 lines
10 KiB
ArmAsm
318 lines
10 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple=powerpc-unknown-freebsd %s -o %t
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# RUN: ld.lld -discard-all -shared %t -o %t2
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# RUN: llvm-readobj -file-headers -sections -section-data -program-headers %t2 | FileCheck %s
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# REQUIRES: ppc
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# exits with return code 42 on FreeBSD
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.text
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li 0,1
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li 3,1
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sc
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// CHECK: Format: ELF32-ppc
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// CHECK-NEXT: Arch: powerpc
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// CHECK-NEXT: AddressSize: 32bit
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// CHECK-NEXT: LoadName:
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// CHECK-NEXT: ElfHeader {
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// CHECK-NEXT: Ident {
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// CHECK-NEXT: Magic: (7F 45 4C 46)
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// CHECK-NEXT: Class: 32-bit (0x1)
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// CHECK-NEXT: DataEncoding: BigEndian (0x2)
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// CHECK-NEXT: FileVersion: 1
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// CHECK-NEXT: OS/ABI: FreeBSD (0x9)
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// CHECK-NEXT: ABIVersion: 0
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// CHECK-NEXT: Unused: (00 00 00 00 00 00 00)
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// CHECK-NEXT: }
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// CHECK-NEXT: Type: SharedObject (0x3)
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// CHECK-NEXT: Machine: EM_PPC (0x14)
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// CHECK-NEXT: Version: 1
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// CHECK-NEXT: Entry: 0x0
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// CHECK-NEXT: ProgramHeaderOffset: 0x34
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// CHECK-NEXT: SectionHeaderOffset: 0x20AC
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// CHECK-NEXT: Flags [ (0x0)
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// CHECK-NEXT: ]
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// CHECK-NEXT: HeaderSize: 52
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// CHECK-NEXT: ProgramHeaderEntrySize: 32
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// CHECK-NEXT: ProgramHeaderCount: 7
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// CHECK-NEXT: SectionHeaderEntrySize: 40
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// CHECK-NEXT: SectionHeaderCount: 10
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// CHECK-NEXT: StringTableSectionIndex: 8
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// CHECK-NEXT: }
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// CHECK-NEXT: Sections [
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// CHECK-NEXT: 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: 0x0
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// CHECK-NEXT: Size: 0
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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: SectionData (
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// CHECK-NEXT: )
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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: .dynsym
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// CHECK-NEXT: Type: SHT_DYNSYM (0xB)
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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: 0x114
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// CHECK-NEXT: Offset: 0x114
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// CHECK-NEXT: Size: 16
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// CHECK-NEXT: Link: 3
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// CHECK-NEXT: Info: 1
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// CHECK-NEXT: AddressAlignment: 4
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// CHECK-NEXT: EntrySize: 16
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// CHECK-NEXT: SectionData (
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// CHECK-NEXT: 0000: 00000000 00000000 00000000 00000000 |................|
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// CHECK-NEXT: )
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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: .hash
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// CHECK-NEXT: Type: SHT_HASH (0x5)
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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: 0x124
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// CHECK-NEXT: Offset: 0x124
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// CHECK-NEXT: Size: 16
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// CHECK-NEXT: Link: 1
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// CHECK-NEXT: Info: 0
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// CHECK-NEXT: AddressAlignment: 4
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// CHECK-NEXT: EntrySize: 4
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// CHECK-NEXT: SectionData (
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// CHECK-NEXT: 0000: 00000001 00000001 00000000 00000000 |................|
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// CHECK-NEXT: )
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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: .dynstr
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// CHECK-NEXT: Type: SHT_STRTAB (0x3)
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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: 0x134
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// CHECK-NEXT: Offset: 0x134
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// CHECK-NEXT: Size: 1
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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: SectionData (
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// CHECK-NEXT: 0000: 00 |.|
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: Section {
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// CHECK-NEXT: Index: 4
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// CHECK-NEXT: Name: .text
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// CHECK-NEXT: 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: 0x1000
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// CHECK-NEXT: Offset: 0x1000
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// CHECK-NEXT: Size: 12
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// CHECK-NEXT: Link: 0
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// CHECK-NEXT: Info: 0
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// CHECK-NEXT: AddressAlignment: 4
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// CHECK-NEXT: EntrySize: 0
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// CHECK-NEXT: SectionData (
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// CHECK-NEXT: 0000: 38000001 38600001 44000002 |8...8`..D...|
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: Section {
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// CHECK-NEXT: Index: 5
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// CHECK-NEXT: Name: .dynamic
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// CHECK-NEXT: Type: SHT_DYNAMIC (0x6)
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// CHECK-NEXT: Flags [ (0x3)
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// CHECK-NEXT: SHF_ALLOC (0x2)
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// CHECK-NEXT: SHF_WRITE (0x1)
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// CHECK-NEXT: ]
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// CHECK-NEXT: Address: 0x2000
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// CHECK-NEXT: Offset: 0x2000
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// CHECK-NEXT: Size: 48
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// CHECK-NEXT: Link: 3
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// CHECK-NEXT: Info: 0
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// CHECK-NEXT: AddressAlignment: 4
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// CHECK-NEXT: EntrySize: 8
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// CHECK-NEXT: SectionData (
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// CHECK-NEXT: 0000: 00000006 00000114 0000000B 00000010 |................|
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// CHECK-NEXT: 0010: 00000005 00000134 0000000A 00000001 |.......4........|
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// CHECK-NEXT: 0020: 00000004 00000124 00000000 00000000 |.......$........|
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: Section {
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// CHECK-NEXT: Index: 6
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// CHECK-NEXT: Name: .comment
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// CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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// CHECK-NEXT: Flags [ (0x30)
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// CHECK-NEXT: SHF_MERGE (0x10)
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// CHECK-NEXT: SHF_STRINGS (0x20)
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// CHECK-NEXT: ]
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// CHECK-NEXT: Address: 0x0
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// CHECK-NEXT: Offset: 0x2030
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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: 1
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// CHECK-NEXT: EntrySize: 1
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// CHECK-NEXT: SectionData (
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// CHECK-NEXT: 0000: 4C4C4420 312E3000 |LLD 1.0.|
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: Section {
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// CHECK-NEXT: Index: 7
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// CHECK-NEXT: Name: .symtab
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// CHECK-NEXT: Type: SHT_SYMTAB (0x2)
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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: 0x2038
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// CHECK-NEXT: Size: 32
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// CHECK-NEXT: Link: 9
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// CHECK-NEXT: Info: 1
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// CHECK-NEXT: AddressAlignment: 4
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// CHECK-NEXT: EntrySize: 16
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// CHECK-NEXT: SectionData (
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// CHECK-NEXT: 0000: 00000000 00000000 00000000 00000000 |................|
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// CHECK-NEXT: 0010: 00000001 00002000 00000000 00020005 |...... .........|
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: Section {
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// CHECK-NEXT: Index: 8
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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: 0x2058
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// CHECK-NEXT: Size: 73
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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: SectionData (
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// CHECK-NEXT: 0000: 002E6479 6E73796D 002E6861 7368002E |..dynsym..hash..|
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// CHECK-NEXT: 0010: 64796E73 7472002E 74657874 002E6479 |dynstr..text..dy|
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// CHECK-NEXT: 0020: 6E616D69 63002E63 6F6D6D65 6E74002E |namic..comment..|
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// CHECK-NEXT: 0030: 73796D74 6162002E 73687374 72746162 |symtab..shstrtab|
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// CHECK-NEXT: 0040: 002E7374 72746162 00 |..strtab.|
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: Section {
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// CHECK-NEXT: Index: 9
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// CHECK-NEXT: Name: .strtab
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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: 0x20A1
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// CHECK-NEXT: Size: 1
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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: SectionData (
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// CHECK-NEXT: 0000: 005F4459 4E414D49 4300 |._DYNAMIC.|
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// CHECK-NEXT: )
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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// CHECK-NEXT: ProgramHeaders [
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// CHECK-NEXT: ProgramHeader {
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// CHECK-NEXT: Type: PT_PHDR (0x6)
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// CHECK-NEXT: Offset: 0x34
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// CHECK-NEXT: VirtualAddress: 0x34
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// CHECK-NEXT: PhysicalAddress: 0x34
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// CHECK-NEXT: FileSize: 224
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// CHECK-NEXT: MemSize: 224
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// CHECK-NEXT: Flags [ (0x4)
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// CHECK-NEXT: PF_R (0x4)
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// CHECK-NEXT: ]
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// CHECK-NEXT: Alignment: 4
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// CHECK-NEXT: }
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// CHECK-NEXT: ProgramHeader {
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// CHECK-NEXT: Type: PT_LOAD (0x1)
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// CHECK-NEXT: Offset: 0x0
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// CHECK-NEXT: VirtualAddress: 0x0
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// CHECK-NEXT: PhysicalAddress: 0x0
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// CHECK-NEXT: FileSize: 309
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// CHECK-NEXT: MemSize: 309
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// CHECK-NEXT: Flags [ (0x4)
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// CHECK-NEXT: PF_R (0x4)
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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: 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: 0x1000
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// CHECK-NEXT: PhysicalAddress: 0x1000
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// CHECK-NEXT: FileSize: 12
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// CHECK-NEXT: MemSize: 12
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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: ProgramHeader {
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// CHECK-NEXT: Type: PT_LOAD (0x1)
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// CHECK-NEXT: Offset: 0x2000
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// CHECK-NEXT: VirtualAddress: 0x2000
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// CHECK-NEXT: PhysicalAddress: 0x2000
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// CHECK-NEXT: FileSize: 48
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// CHECK-NEXT: MemSize: 48
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// CHECK-NEXT: Flags [ (0x6)
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// CHECK-NEXT: PF_R (0x4)
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// CHECK-NEXT: PF_W (0x2)
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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: ProgramHeader {
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// CHECK-NEXT: Type: PT_DYNAMIC (0x2)
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// CHECK-NEXT: Offset: 0x2000
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// CHECK-NEXT: VirtualAddress: 0x2000
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// CHECK-NEXT: PhysicalAddress: 0x2000
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// CHECK-NEXT: FileSize: 48
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// CHECK-NEXT: MemSize: 48
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// CHECK-NEXT: Flags [ (0x6)
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// CHECK-NEXT: PF_R (0x4)
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// CHECK-NEXT: PF_W (0x2)
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// CHECK-NEXT: ]
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// CHECK-NEXT: Alignment: 4
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// CHECK-NEXT: }
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// CHECK-NEXT: ProgramHeader {
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// CHECK-NEXT: Type: PT_GNU_RELRO (0x6474E552)
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// CHECK-NEXT: Offset: 0x2000
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// CHECK-NEXT: VirtualAddress: 0x2000
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// CHECK-NEXT: PhysicalAddress: 0x2000
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// CHECK-NEXT: FileSize: 48
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// CHECK-NEXT: MemSize: 48
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// CHECK-NEXT: Flags [ (0x4)
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// CHECK-NEXT: PF_R (0x4)
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// CHECK-NEXT: ]
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// CHECK-NEXT: Alignment: 1
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// CHECK-NEXT: }
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// CHECK-NEXT: ProgramHeader {
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// CHECK-NEXT: Type: PT_GNU_STACK (0x6474E551)
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// CHECK-NEXT: Offset: 0x0
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// CHECK-NEXT: VirtualAddress: 0x0
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// CHECK-NEXT: PhysicalAddress: 0x0
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// CHECK-NEXT: FileSize: 0
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// CHECK-NEXT: MemSize: 0
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// CHECK-NEXT: Flags [ (0x6)
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// CHECK-NEXT: PF_R (0x4)
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// CHECK-NEXT: PF_W (0x2)
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// CHECK-NEXT: ]
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// CHECK-NEXT: Alignment: 0
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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