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Add bare minimum to get a working i386 linux program. 

llvm-svn: 244050
This commit is contained in:
Rafael Espindola 2015-08-05 15:08:40 +00:00
parent ea43d95329
commit 4b7c2fc64e
3 changed files with 145 additions and 5 deletions
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25
lld/ELF/Driver.cpp
View File

@ -114,6 +114,27 @@ void LinkerDriver::link(ArrayRef<const char *> ArgsArr) {
Symtab.reportRemainingUndefines();
// Write the result.
Writer<object::ELF64LE> Out(&Symtab);
Out.write(Config->OutputFile);
ObjectFileBase &FirstObj = *Symtab.ObjectFiles[0];
switch (FirstObj.kind()) {
case InputFile::Object32LEKind: {
Writer<object::ELF32LE> Out(&Symtab);
Out.write(Config->OutputFile);
return;
}
case InputFile::Object32BEKind: {
Writer<object::ELF32BE> Out(&Symtab);
Out.write(Config->OutputFile);
return;
}
case InputFile::Object64LEKind: {
Writer<object::ELF64LE> Out(&Symtab);
Out.write(Config->OutputFile);
return;
}
case InputFile::Object64BEKind: {
Writer<object::ELF64BE> Out(&Symtab);
Out.write(Config->OutputFile);
return;
}
}
}

9
lld/ELF/Writer.cpp
View File

@ -119,13 +119,16 @@ template <class ELFT> void Writer<ELFT>::writeHeader() {
EHdr->e_ident[EI_MAG1] = 0x45;
EHdr->e_ident[EI_MAG2] = 0x4C;
EHdr->e_ident[EI_MAG3] = 0x46;
EHdr->e_ident[EI_CLASS] = ELFCLASS64;
EHdr->e_ident[EI_DATA] = ELFDATA2LSB;
EHdr->e_ident[EI_CLASS] = ELFT::Is64Bits ? ELFCLASS64 : ELFCLASS32;
EHdr->e_ident[EI_DATA] = ELFT::TargetEndianness == llvm::support::little
? ELFDATA2LSB
: ELFDATA2MSB;
EHdr->e_ident[EI_VERSION] = EV_CURRENT;
EHdr->e_ident[EI_OSABI] = ELFOSABI_NONE;
EHdr->e_type = ET_EXEC;
EHdr->e_machine = EM_X86_64;
auto &FirstObj = cast<ObjectFile<ELFT>>(*Symtab->ObjectFiles[0]);
EHdr->e_machine = FirstObj.getObj()->getHeader()->e_machine;
EHdr->e_version = EV_CURRENT;
EHdr->e_entry = 0x401000;
EHdr->e_phoff = sizeof(Elf_Ehdr_Impl<ELFT>);

116
lld/test/elf2/basic32.s Normal file
View File

@ -0,0 +1,116 @@
# RUN: llvm-mc -filetype=obj -triple=i686-unknown-linux %s -o %t
# RUN: lld -flavor gnu2 %t -o %t2
# RUN: llvm-readobj -file-headers -sections -program-headers %t2 | FileCheck %s
# REQUIRES: x86
# exits with return code 42 on linux
.globl _start;
_start:
mov $1, %eax
mov $42, %ebx
int $0x80
# CHECK: ElfHeader {
# CHECK-NEXT: Ident {
# CHECK-NEXT: Magic: (7F 45 4C 46)
# CHECK-NEXT: Class: 32-bit (0x1)
# CHECK-NEXT: DataEncoding: LittleEndian (0x1)
# CHECK-NEXT: FileVersion: 1
# CHECK-NEXT: OS/ABI: SystemV (0x0)
# CHECK-NEXT: ABIVersion: 0
# CHECK-NEXT: Unused: (00 00 00 00 00 00 00)
# CHECK-NEXT: }
# CHECK-NEXT: Type: Executable (0x2)
# CHECK-NEXT: Machine: EM_386 (0x3)
# CHECK-NEXT: Version: 1
# CHECK-NEXT: Entry: 0x401000
# CHECK-NEXT: ProgramHeaderOffset: 0x34
# CHECK-NEXT: SectionHeaderOffset: 0x1010
# CHECK-NEXT: Flags [ (0x0)
# CHECK-NEXT: ]
# CHECK-NEXT: HeaderSize: 52
# CHECK-NEXT: ProgramHeaderEntrySize: 32
# CHECK-NEXT: ProgramHeaderCount: 1
# CHECK-NEXT: SectionHeaderEntrySize: 40
# CHECK-NEXT: SectionHeaderCount: 4
# CHECK-NEXT: StringTableSectionIndex: 0
# CHECK-NEXT: }
# CHECK-NEXT: Sections [
# CHECK-NEXT: Section {
# CHECK-NEXT: Index: 0
# CHECK-NEXT: Name: (0)
# CHECK-NEXT: Type: SHT_NULL (0x0)
# CHECK-NEXT: Flags [ (0x0)
# CHECK-NEXT: ]
# CHECK-NEXT: Address: 0x0
# CHECK-NEXT: Offset: 0x0
# CHECK-NEXT: Size: 0
# CHECK-NEXT: Link: 0
# CHECK-NEXT: Info: 0
# CHECK-NEXT: AddressAlignment: 0
# CHECK-NEXT: EntrySize: 0
# CHECK-NEXT: }
# CHECK-NEXT: Section {
# CHECK-NEXT: Index: 1
# CHECK-NEXT: Name: (0)
# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
# CHECK-NEXT: Flags [ (0x6)
# CHECK-NEXT: SHF_ALLOC (0x2)
# CHECK-NEXT: SHF_EXECINSTR (0x4)
# CHECK-NEXT: ]
# CHECK-NEXT: Address: 0x1000
# CHECK-NEXT: Offset: 0x1000
# CHECK-NEXT: Size: 12
# CHECK-NEXT: Link: 0
# CHECK-NEXT: Info: 0
# CHECK-NEXT: AddressAlignment: 0
# CHECK-NEXT: EntrySize: 0
# CHECK-NEXT: }
# CHECK-NEXT: Section {
# CHECK-NEXT: Index: 2
# CHECK-NEXT: Name: (0)
# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
# CHECK-NEXT: Flags [ (0x3)
# CHECK-NEXT: SHF_ALLOC (0x2)
# CHECK-NEXT: SHF_WRITE (0x1)
# CHECK-NEXT: ]
# CHECK-NEXT: Address: 0x2000
# CHECK-NEXT: Offset: 0x0
# CHECK-NEXT: Size: 0
# CHECK-NEXT: Link: 0
# CHECK-NEXT: Info: 0
# CHECK-NEXT: AddressAlignment: 0
# CHECK-NEXT: EntrySize: 0
# CHECK-NEXT: }
# CHECK-NEXT: Section {
# CHECK-NEXT: Index: 3
# CHECK-NEXT: Name: (0)
# CHECK-NEXT: Type: SHT_NOBITS (0x8)
# CHECK-NEXT: Flags [ (0x3)
# CHECK-NEXT: SHF_ALLOC (0x2)
# CHECK-NEXT: SHF_WRITE (0x1)
# CHECK-NEXT: ]
# CHECK-NEXT: Address: 0x2000
# CHECK-NEXT: Offset: 0x0
# CHECK-NEXT: Size: 0
# CHECK-NEXT: Link: 0
# CHECK-NEXT: Info: 0
# CHECK-NEXT: AddressAlignment: 0
# CHECK-NEXT: EntrySize: 0
# CHECK-NEXT: }
# CHECK-NEXT: ]
# CHECK-NEXT: ProgramHeaders [
# CHECK-NEXT: ProgramHeader {
# CHECK-NEXT: Type: PT_LOAD (0x1)
# CHECK-NEXT: Offset: 0x0
# CHECK-NEXT: VirtualAddress: 0x400000
# CHECK-NEXT: PhysicalAddress: 0x400000
# CHECK-NEXT: FileSize: 4272
# CHECK-NEXT: MemSize: 4272
# CHECK-NEXT: Flags [ (0x5)
# CHECK-NEXT: PF_R (0x4)
# CHECK-NEXT: PF_X (0x1)
# CHECK-NEXT: ]
# CHECK-NEXT: Alignment: 16384
# CHECK-NEXT: }
# CHECK-NEXT: ]