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diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsl.asm b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsl.asm
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+//------------------------------------------------------------------------------
+//
+// Copyright (c) 2008-2009 Apple Inc. All rights reserved.
+//
+// All rights reserved. This program and the accompanying materials
+// are licensed and made available under the terms and conditions of the BSD License
+// which accompanies this distribution. The full text of the license may be found at
+// http://opensource.org/licenses/bsd-license.php
+//
+// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+//
+//------------------------------------------------------------------------------
+
+
+ EXPORT __aeabi_llsl
+
+ AREA Math, CODE, READONLY
+
+;
+;VOID
+;EFIAPI
+;__aeabi_llsl (
+; IN VOID *Destination,
+; IN VOID *Source,
+; IN UINT32 Size
+; );
+;
+
+__aeabi_llsl
+ SUBS r3,r2,#0x20
+ BPL {pc} + 0x18 ; 0x1c
+ RSB r3,r2,#0x20
+ LSL r1,r1,r2
+ ORR r1,r1,r0,LSR r3
+ LSL r0,r0,r2
+ BX lr
+ LSL r1,r0,r3
+ MOV r0,#0
+ BX lr
+
+ END
+