1 files changed, 54 insertions, 0 deletions
diff --git a/src/debug/ee/arm64/dbghelpers.asm b/src/debug/ee/arm64/dbghelpers.asm
new file mode 100644
index 0000000000..ded1a0d184
--- /dev/null
+++ b/src/debug/ee/arm64/dbghelpers.asm
@@ -0,0 +1,54 @@
+; 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 "ksarm64.h"
+#include "asmconstants.h"
+#include "asmmacros.h"
+
+    IMPORT FuncEvalHijackWorker
+    IMPORT FuncEvalHijackPersonalityRoutine
+    IMPORT ExceptionHijackWorker
+    IMPORT ExceptionHijackPersonalityRoutine
+    EXPORT ExceptionHijackEnd
+;
+; hijacking stub used to perform a func-eval, see Debugger::FuncEvalSetup() for use.
+;
+; on entry:
+;   x0  : pointer to DebuggerEval object
+;
+
+    NESTED_ENTRY FuncEvalHijack,,FuncEvalHijackPersonalityRoutine
+
+    ; NOTE: FuncEvalHijackPersonalityRoutine is dependent on the stack layout so if
+    ;       you change the prolog you will also need to update the personality routine.
+
+    ; push arg to the stack so our personality routine can find it
+    ; push lr to get good stacktrace in debugger
+    PROLOG_SAVE_REG_PAIR           fp, lr, #-32!
+    str x0, [sp, #16]
+    ; FuncEvalHijackWorker returns the address we should jump to. 
+    bl FuncEvalHijackWorker
+
+    EPILOG_STACK_FREE 32
+    EPILOG_BRANCH_REG x0
+    NESTED_END FuncEvalHijack
+
+    NESTED_ENTRY ExceptionHijack,,ExceptionHijackPersonalityRoutine
+
+    ; make the call
+    bl ExceptionHijackWorker
+
+    ; effective NOP to terminate unwind
+    mov x3, x3
+
+    ; *** should never get here ***
+    EMIT_BREAKPOINT
+
+; exported label so the debugger knows where the end of this function is
+ExceptionHijackEnd
+    NESTED_END ExceptionHijack
+
+    ; must be at end of file
+    END
+