Imported Upstream version 2.0.0.11353upstream/2.0.0.11353

1 files changed, 32 insertions, 0 deletions

diff --git a/src/pal/src/arch/arm64/callsignalhandlerwrapper.S b/src/pal/src/arch/arm64/callsignalhandlerwrapper.S
new file mode 100644
index 0000000000..90fb602479
--- /dev/null
+++ b/src/pal/src/arch/arm64/callsignalhandlerwrapper.S
@@ -0,0 +1,32 @@
+// 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 "unixasmmacros.inc"
+#include "asmconstants.h"
+
+.macro CALL_SIGNAL_HANDLER_WRAPPER Alignment
+
+.globl C_FUNC(SignalHandlerWorkerReturnOffset\Alignment)
+C_FUNC(SignalHandlerWorkerReturnOffset\Alignment):
+    .int LOCAL_LABEL(SignalHandlerWorkerReturn\Alignment)-C_FUNC(CallSignalHandlerWrapper\Alignment)
+
+// This function is never called, only a fake stack frame will be setup to have a return
+// address set to SignalHandlerWorkerReturn during SIGSEGV handling.
+// It enables the unwinder to unwind stack from the handling code to the actual failure site.
+NESTED_ENTRY CallSignalHandlerWrapper\Alignment, _TEXT, NoHandler
+__StackAllocationSize = (128 + 8 + 8 + \Alignment) // red zone + fp + lr + alignment 
+    PROLOG_STACK_ALLOC __StackAllocationSize
+    .cfi_adjust_cfa_offset __StackAllocationSize
+    PROLOG_SAVE_REG_PAIR fp, lr, 0
+    bl      EXTERNAL_C_FUNC(signal_handler_worker)
+LOCAL_LABEL(SignalHandlerWorkerReturn\Alignment):
+    EPILOG_RESTORE_REG_PAIR fp, lr, 0
+    EPILOG_STACK_FREE __StackAllocationSize
+    ret
+NESTED_END CallSignalHandlerWrapper\Alignment, _TEXT
+
+.endm
+
+CALL_SIGNAL_HANDLER_WRAPPER 0
+CALL_SIGNAL_HANDLER_WRAPPER 8