1 files changed, 39 insertions, 0 deletions
diff --git a/MdePkg/Library/CompilerIntrinsicsLib/Arm/llsr.asm b/MdePkg/Library/CompilerIntrinsicsLib/Arm/llsr.asm
new file mode 100644
index 0000000000..fce1df28f0
--- /dev/null
+++ b/MdePkg/Library/CompilerIntrinsicsLib/Arm/llsr.asm
@@ -0,0 +1,39 @@
+//------------------------------------------------------------------------------
+//
+// Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+// Copyright (c) 2018, Pete Batard. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+//------------------------------------------------------------------------------
+
+  EXPORT  __aeabi_llsr
+  EXPORT  __rt_srsh
+
+  AREA  s___aeabi_llsr, CODE, READONLY, ARM
+
+  ARM
+
+;
+;VOID
+;EFIAPI
+;__aeabi_llsr (
+;  IN  UINT64  Value,
+;  IN  UINT32  Shift
+;)
+;
+__aeabi_llsr
+__rt_srsh
+    SUBS     r3,r2,#0x20
+    BPL      __aeabi_llsr_label1
+    RSB      r3,r2,#0x20
+    LSR      r0,r0,r2
+    ORR      r0,r0,r1,LSL r3
+    LSR      r1,r1,r2
+    BX       lr
+__aeabi_llsr_label1
+    LSR      r0,r1,r3
+    MOV      r1,#0
+    BX       lr
+
+    END