1 files changed, 36 insertions, 0 deletions
diff --git a/src/vm/amd64/ThePreStubAMD64.asm b/src/vm/amd64/ThePreStubAMD64.asm
new file mode 100644
index 0000000000..86a9775632
--- /dev/null
+++ b/src/vm/amd64/ThePreStubAMD64.asm
@@ -0,0 +1,36 @@
+; Licensed to the .NET Foundation under one or more agreements.
+; The .NET Foundation licenses this file to you under the MIT license.
+; See the LICENSE file in the project root for more information.
+
+include <AsmMacros.inc>
+include AsmConstants.inc
+
+        extern  PreStubWorker:proc
+        extern  ProcessCLRException:proc
+
+NESTED_ENTRY ThePreStub, _TEXT, ProcessCLRException
+
+        PROLOG_WITH_TRANSITION_BLOCK
+
+        ;
+        ; call PreStubWorker
+        ;
+        lea             rcx, [rsp + __PWTB_TransitionBlock]     ; pTransitionBlock*
+        mov             rdx, METHODDESC_REGISTER
+        call            PreStubWorker
+
+        EPILOG_WITH_TRANSITION_BLOCK_TAILCALL
+        TAILJMP_RAX
+
+NESTED_END ThePreStub, _TEXT
+
+LEAF_ENTRY ThePreStubPatch, _TEXT
+        ; make sure that the basic block is unique
+        test            eax,34
+PATCH_LABEL ThePreStubPatchLabel
+        ret
+LEAF_END ThePreStubPatch, _TEXT
+
+
+
+end