diff options
Diffstat (limited to 'src/pal/src/arch/arm64/callsignalhandlerwrapper.S')
-rw-r--r-- | src/pal/src/arch/arm64/callsignalhandlerwrapper.S | 32 |
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 |