Index: llvm/include/llvm/BinaryFormat/Dwarf.def
===================================================================
--- llvm/include/llvm/BinaryFormat/Dwarf.def
+++ llvm/include/llvm/BinaryFormat/Dwarf.def
@@ -1012,6 +1012,7 @@
 HANDLE_DW_CC(0xc9, LLVM_PreserveMost)
 HANDLE_DW_CC(0xca, LLVM_PreserveAll)
 HANDLE_DW_CC(0xcb, LLVM_X86RegCall)
+HANDLE_DW_CC(0xcc, LLVM_M68kRTD)
 // From GCC source code (include/dwarf2.h): This DW_CC_ value is not currently
 // generated by any toolchain.  It is used internally to GDB to indicate OpenCL
 // C functions that have been compiled with the IBM XL C for OpenCL compiler and
Index: llvm/lib/DebugInfo/DWARF/DWARFTypePrinter.cpp
===================================================================
--- llvm/lib/DebugInfo/DWARF/DWARFTypePrinter.cpp
+++ llvm/lib/DebugInfo/DWARF/DWARFTypePrinter.cpp
@@ -620,6 +620,9 @@
     case CallingConvention::DW_CC_LLVM_X86RegCall:
       OS << " __attribute__((regcall))";
       break;
+    case CallingConvention::DW_CC_LLVM_M68kRTD:
+      OS << " __attribute__((m68k_rtd))";
+      break;
     }
   }