Index: lib/builtins/CMakeLists.txt
===================================================================
--- lib/builtins/CMakeLists.txt
+++ lib/builtins/CMakeLists.txt
@@ -347,7 +347,11 @@
   arm/aeabi_memmove.S
   arm/aeabi_memset.S
   arm/aeabi_uidivmod.S
-  arm/aeabi_uldivmod.S)
+  arm/aeabi_uldivmod.S
+  arm/aeabi_uread4.c
+  arm/aeabi_uread8.c
+  arm/aeabi_uwrite4.c
+  arm/aeabi_uwrite8.c)
 
 set(arm_Thumb1_JT_SOURCES
   arm/switch16.S
Index: lib/builtins/arm/aeabi_uread4.c
===================================================================
--- /dev/null
+++ lib/builtins/arm/aeabi_uread4.c
@@ -0,0 +1,18 @@
+//===-- aeabi_uread4.c - EABI unaligned read implementation ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdint.h>
+#include "../int_lib.h"
+
+AEABI_RTABI si_int __aeabi_uread4(char* p) {
+    struct unaligned_int {
+      si_int v;
+    } __attribute__((__packed__, __may_alias__));
+    return ((struct unaligned_int*)p)->v;
+}
Index: lib/builtins/arm/aeabi_uread8.c
===================================================================
--- /dev/null
+++ lib/builtins/arm/aeabi_uread8.c
@@ -0,0 +1,18 @@
+//===-- aeabi_uread8.c - EABI unaligned read implementation ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdint.h>
+#include "../int_lib.h"
+
+AEABI_RTABI di_int __aeabi_uread8(char* p) {
+    struct unaligned_int {
+      di_int v;
+    } __attribute__((__packed__, __may_alias__));
+    return ((struct unaligned_int*)p)->v;
+}
Index: lib/builtins/arm/aeabi_uwrite4.c
===================================================================
--- /dev/null
+++ lib/builtins/arm/aeabi_uwrite4.c
@@ -0,0 +1,19 @@
+//===-- aeabi_uwrite4.c - EABI unaligned write implementation -------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdint.h>
+#include "../int_lib.h"
+
+AEABI_RTABI void __aeabi_uwrite4(si_int value, char* p) {
+    struct unaligned_int {
+      si_int v;
+    } __attribute__((__packed__, __may_alias__));
+    ((struct unaligned_int*)p)->v = value;
+}
+
Index: lib/builtins/arm/aeabi_uwrite8.c
===================================================================
--- /dev/null
+++ lib/builtins/arm/aeabi_uwrite8.c
@@ -0,0 +1,19 @@
+//===-- aeabi_uwrite8.c - EABI unaligned write implementation -------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdint.h>
+#include "../int_lib.h"
+
+AEABI_RTABI void __aeabi_uwrite8(di_int value, char* p) {
+    struct unaligned_int {
+      di_int v;
+    } __attribute__((__packed__, __may_alias__));
+    ((struct unaligned_int*)p)->v = value;
+}
+