4 files changed, 24 insertions, 4 deletions
diff --git a/llvm/lib/Object/ELF.cpp b/llvm/lib/Object/ELF.cpp
index 398e9e41299..62c27cc427a 100644
--- a/llvm/lib/Object/ELF.cpp
+++ b/llvm/lib/Object/ELF.cpp
@@ -26,6 +26,7 @@ StringRef getELFRelocationTypeName(uint32_t Machine, uint32_t Type) {
     }
     break;
   case ELF::EM_386:
+  case ELF::EM_IAMCU:
     switch (Type) {
 #include "llvm/Support/ELFRelocs/i386.def"
     default:
diff --git a/llvm/lib/Object/ELFYAML.cpp b/llvm/lib/Object/ELFYAML.cpp
index 6866b4d7844..25317be7e04 100644
--- a/llvm/lib/Object/ELFYAML.cpp
+++ b/llvm/lib/Object/ELFYAML.cpp
@@ -486,6 +486,7 @@ void ScalarEnumerationTraits<ELFYAML::ELF_REL>::enumeration(
 #include "llvm/Support/ELFRelocs/Hexagon.def"
     break;
   case ELF::EM_386:
+  case ELF::EM_IAMCU:
 #include "llvm/Support/ELFRelocs/i386.def"
     break;
   case ELF::EM_AARCH64:
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
index 629802f5dc5..00a5d3404ce 100644
--- a/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
@@ -359,6 +359,17 @@ public:
   }
 };
 
+class ELFX86_IAMCUAsmBackend : public ELFX86AsmBackend {
+public:
+  ELFX86_IAMCUAsmBackend(const Target &T, uint8_t OSABI, StringRef CPU)
+      : ELFX86AsmBackend(T, OSABI, CPU) {}
+
+  MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override {
+    return createX86ELFObjectWriter(OS, /*IsELF64*/ false, OSABI,
+                                    ELF::EM_IAMCU);
+  }
+};
+
 class ELFX86_64AsmBackend : public ELFX86AsmBackend {
 public:
   ELFX86_64AsmBackend(const Target &T, uint8_t OSABI, StringRef CPU)
@@ -780,6 +791,10 @@ MCAsmBackend *llvm::createX86_32AsmBackend(const Target &T,
     return new WindowsX86AsmBackend(T, false, CPU);
 
   uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TheTriple.getOS());
+
+  if (TheTriple.isOSIAMCU())
+    return new ELFX86_IAMCUAsmBackend(T, OSABI, CPU);
+
   return new ELFX86_32AsmBackend(T, OSABI, CPU);
 }
 
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
index a33468dc476..736c39dfb6f 100644
--- a/llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
@@ -32,9 +32,11 @@ namespace {
 
 X86ELFObjectWriter::X86ELFObjectWriter(bool IsELF64, uint8_t OSABI,
                                        uint16_t EMachine)
-  : MCELFObjectTargetWriter(IsELF64, OSABI, EMachine,
-                            // Only i386 uses Rel instead of RelA.
-                            /*HasRelocationAddend*/ EMachine != ELF::EM_386) {}
+    : MCELFObjectTargetWriter(IsELF64, OSABI, EMachine,
+                              // Only i386 and IAMCU use Rel instead of RelA.
+                              /*HasRelocationAddend*/
+                              (EMachine != ELF::EM_386) &&
+                                  (EMachine != ELF::EM_IAMCU)) {}
 
 X86ELFObjectWriter::~X86ELFObjectWriter()
 {}
@@ -246,7 +248,8 @@ unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
   if (getEMachine() == ELF::EM_X86_64)
     return getRelocType64(Modifier, Type, IsPCRel);
 
-  assert(getEMachine() == ELF::EM_386 && "Unsupported ELF machine type.");
+  assert((getEMachine() == ELF::EM_386 || getEMachine() == ELF::EM_IAMCU) &&
+         "Unsupported ELF machine type.");
   return getRelocType32(Modifier, getType32(Type), IsPCRel);
 }