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[x32] Add AsmBackend for X32 which uses ELF32 with x86_64 (the author is Pavel Chupin).

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This is minimal change for backend required to have "hello world" compiled and working on x32 target (x86_64-linux-gnux32). More patches for x32 will follow.

Differential Revision: http://reviews.llvm.org/D4181



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212716 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zinovy Nis 2014-07-10 13:03:26 +00:00
parent cdbdfa28d1
commit a2bc403710
1 changed files with 14 additions and 0 deletions
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14
lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
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@ -366,6 +366,17 @@ public:
}
};
class ELFX86_X32AsmBackend : public ELFX86AsmBackend {
public:
ELFX86_X32AsmBackend(const Target &T, uint8_t OSABI, StringRef CPU)
: ELFX86AsmBackend(T, OSABI, CPU) {}
MCObjectWriter *createObjectWriter(raw_ostream &OS) const override {
return createX86ELFObjectWriter(OS, /*IsELF64*/ false, OSABI,
ELF::EM_X86_64);
}
};
class ELFX86_64AsmBackend : public ELFX86AsmBackend {
public:
ELFX86_64AsmBackend(const Target &T, uint8_t OSABI, StringRef CPU)
@ -824,5 +835,8 @@ MCAsmBackend *llvm::createX86_64AsmBackend(const Target &T,
return new WindowsX86AsmBackend(T, true, CPU);
uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TheTriple.getOS());
if (TheTriple.getEnvironment() == Triple::GNUX32)
return new ELFX86_X32AsmBackend(T, OSABI, CPU);
return new ELFX86_64AsmBackend(T, OSABI, CPU);
}