Index: llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
===================================================================
--- llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
+++ llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
@@ -18,8 +18,10 @@
 #include "llvm/MC/MCObjectWriter.h"
 #include "llvm/MC/MCValue.h"
 #include "llvm/Support/TargetRegistry.h"
+#include "Utils/AMDGPUBaseInfo.h"
 
 using namespace llvm;
+using namespace llvm::AMDGPU;
 
 namespace {
 
@@ -172,11 +174,13 @@
   bool Is64Bit;
   bool HasRelocationAddend;
   uint8_t OSABI = ELF::ELFOSABI_NONE;
+  uint8_t ABIVersion = 0;
 
 public:
-  ELFAMDGPUAsmBackend(const Target &T, const Triple &TT) :
+  ELFAMDGPUAsmBackend(const Target &T, const Triple &TT, uint8_t ABIVersion) :
       AMDGPUAsmBackend(T), Is64Bit(TT.getArch() == Triple::amdgcn),
-      HasRelocationAddend(TT.getOS() == Triple::AMDHSA) {
+      HasRelocationAddend(TT.getOS() == Triple::AMDHSA),
+      ABIVersion(ABIVersion) {
     switch (TT.getOS()) {
     case Triple::AMDHSA:
       OSABI = ELF::ELFOSABI_AMDGPU_HSA;
@@ -194,7 +198,8 @@
 
   std::unique_ptr<MCObjectTargetWriter>
   createObjectTargetWriter() const override {
-    return createAMDGPUELFObjectWriter(Is64Bit, OSABI, HasRelocationAddend);
+    return createAMDGPUELFObjectWriter(Is64Bit, OSABI, HasRelocationAddend,
+                                       ABIVersion);
   }
 };
 
@@ -205,5 +210,6 @@
                                            const MCRegisterInfo &MRI,
                                            const MCTargetOptions &Options) {
   // Use 64-bit ELF for amdgcn
-  return new ELFAMDGPUAsmBackend(T, STI.getTargetTriple());
+  return new ELFAMDGPUAsmBackend(T, STI.getTargetTriple(),
+                                 IsaInfo::hasCodeObjectV3(&STI) ? 1 : 0);
 }
Index: llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
===================================================================
--- llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
+++ llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
@@ -22,7 +22,8 @@
 
 class AMDGPUELFObjectWriter : public MCELFObjectTargetWriter {
 public:
-  AMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI, bool HasRelocationAddend);
+  AMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI, bool HasRelocationAddend,
+                        uint8_t ABIVersion);
 
 protected:
   unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
@@ -34,9 +35,10 @@
 
 AMDGPUELFObjectWriter::AMDGPUELFObjectWriter(bool Is64Bit,
                                              uint8_t OSABI,
-                                             bool HasRelocationAddend)
+                                             bool HasRelocationAddend,
+                                             uint8_t ABIVersion)
   : MCELFObjectTargetWriter(Is64Bit, OSABI, ELF::EM_AMDGPU,
-                            HasRelocationAddend) {}
+                            HasRelocationAddend, ABIVersion) {}
 
 unsigned AMDGPUELFObjectWriter::getRelocType(MCContext &Ctx,
                                              const MCValue &Target,
@@ -83,7 +85,9 @@
 
 std::unique_ptr<MCObjectTargetWriter>
 llvm::createAMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI,
-                                  bool HasRelocationAddend) {
+                                  bool HasRelocationAddend,
+                                  uint8_t ABIVersion) {
   return llvm::make_unique<AMDGPUELFObjectWriter>(Is64Bit, OSABI,
-                                                  HasRelocationAddend);
+                                                  HasRelocationAddend,
+                                                  ABIVersion);
 }
Index: llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCTargetDesc.h
===================================================================
--- llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCTargetDesc.h
+++ llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCTargetDesc.h
@@ -52,7 +52,7 @@
 
 std::unique_ptr<MCObjectTargetWriter>
 createAMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI,
-                            bool HasRelocationAddend);
+                            bool HasRelocationAddend, uint8_t ABIVersion);
 } // End llvm namespace
 
 #define GET_REGINFO_ENUM
Index: llvm/trunk/test/CodeGen/AMDGPU/elf-header-osabi.ll
===================================================================
--- llvm/trunk/test/CodeGen/AMDGPU/elf-header-osabi.ll
+++ llvm/trunk/test/CodeGen/AMDGPU/elf-header-osabi.ll
@@ -13,8 +13,11 @@
 
 ; NONE:   OS/ABI: SystemV       (0x0)
 ; HSA:    OS/ABI: AMDGPU_HSA    (0x40)
+; HSA:    ABIVersion: 1
 ; PAL:    OS/ABI: AMDGPU_PAL    (0x41)
+; PAL:    ABIVersion: 0
 ; MESA3D: OS/ABI: AMDGPU_MESA3D (0x42)
+; MESA3D:    ABIVersion: 0
 
 define amdgpu_kernel void @elf_header() {
   ret void