1 files changed, 53 insertions, 0 deletions
diff --git a/MdePkg/Library/CompilerIntrinsicsLib/Arm/uwrite.S b/MdePkg/Library/CompilerIntrinsicsLib/Arm/uwrite.S
new file mode 100644
index 0000000000..2c56ba3e06
--- /dev/null
+++ b/MdePkg/Library/CompilerIntrinsicsLib/Arm/uwrite.S
@@ -0,0 +1,53 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#------------------------------------------------------------------------------
+
+#include <AsmMacroLib.h>
+
+#
+#UINT32
+#EFIAPI
+#__aeabi_uwrite4 (
+#  IN UINT32 Data,
+#  IN VOID   *Pointer
+#  );
+#
+ASM_FUNC(__aeabi_uwrite4)
+    mov     r2, r0, lsr #8
+    strb    r0, [r1]
+    strb    r2, [r1, #1]
+    mov     r2, r0, lsr #16
+    strb    r2, [r1, #2]
+    mov     r2, r0, lsr #24
+    strb    r2, [r1, #3]
+    bx      lr
+
+#
+#UINT64
+#EFIAPI
+#__aeabi_uwrite8 (
+#  IN UINT64 Data,
+#  IN VOID   *Pointer
+#  );
+#
+ASM_FUNC(__aeabi_uwrite8)
+    mov     r3, r0, lsr #8
+    strb    r0, [r2]
+    strb    r3, [r2, #1]
+    mov     r3, r0, lsr #16
+    strb    r3, [r2, #2]
+    mov     r3, r0, lsr #24
+    strb    r3, [r2, #3]
+
+    mov     r3, r1, lsr #8
+    strb    r1, [r2, #4]
+    strb    r3, [r2, #5]
+    mov     r3, r1, lsr #16
+    strb    r3, [r2, #6]
+    mov     r3, r1, lsr #24
+    strb    r3, [r2, #7]
+    bx      lr