From cad431c122ea678344ac465c5bce626720dcc94e Mon Sep 17 00:00:00 2001 From: Zinovy Nis Date: Thu, 10 Jul 2014 13:03:26 +0000 Subject: [PATCH] [x32] Add AsmBackend for X32 which uses ELF32 with x86_64 (the author is Pavel Chupin). 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 llvm-svn: 212716 --- llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp index c12a57a..23bca0d 100644 --- a/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp +++ b/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp @@ -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); } -- 2.7.4