Index: lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFX86_64.h
===================================================================
--- lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFX86_64.h
+++ lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFX86_64.h
@@ -128,6 +128,13 @@
       break;
     }
 
+    case COFF::IMAGE_REL_AMD64_SECREL: {
+      assert(static_cast<int64_t>(RE.Addend) <= INT32_MAX && "Relocation overflow");
+      assert(static_cast<int64_t>(RE.Addend) >= INT32_MIN && "Relocation underflow");
+      writeBytesUnaligned(RE.Addend, Target, 4);
+      break;
+    }
+
     default:
       llvm_unreachable("Relocation type not implemented yet!");
       break;
Index: test/ExecutionEngine/RuntimeDyld/X86/COFF_x86_64_IMGREL.s
===================================================================
--- test/ExecutionEngine/RuntimeDyld/X86/COFF_x86_64_IMGREL.s
+++ test/ExecutionEngine/RuntimeDyld/X86/COFF_x86_64_IMGREL.s
@@ -24,3 +24,17 @@
 # rtdyld-check: decode_operand(inst2, 3) = section_addr(COFF_x86_64_IMGREL.o, .rdata)+5-40960000000000
 inst2:
     mov %ebx, (__constdata@imgrel+5)
+        .data
+        .space 375
+rel1:
+# rtdyld-check: *{4}rel1 = string - section_addr(COFF_x86_64_IMGREL.o, .data)
+	.secrel32 string
+
+# We explicitly add padding to put string outside of the 16bit address space
+# (absolute and as an offset from .data), so that relocations involving
+# 32bit addresses / offsets are not accidentally truncated to 16 bits.
+        .space 65536
+        .global string
+        .align 1
+string:
+        .asciz "Hello World\n"