diff options
Diffstat (limited to 'src/pal/src/arch/amd64/callsignalhandlerwrapper.S')
| -rw-r--r-- | src/pal/src/arch/amd64/callsignalhandlerwrapper.S | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/pal/src/arch/amd64/callsignalhandlerwrapper.S b/src/pal/src/arch/amd64/callsignalhandlerwrapper.S new file mode 100644 index 0000000000..8260591c30 --- /dev/null +++ b/src/pal/src/arch/amd64/callsignalhandlerwrapper.S @@ -0,0 +1,31 @@ +// 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. + +.intel_syntax noprefix +#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 + .cfi_def_cfa_offset (128 + 8 + \Alignment) // red zone + return address + alignment + .cfi_offset rip, -(128 + 8 + \Alignment) + push_nonvol_reg rbp + call EXTERNAL_C_FUNC(signal_handler_worker) +LOCAL_LABEL(SignalHandlerWorkerReturn\Alignment): + pop rbp + ret +NESTED_END CallSignalHandlerWrapper\Alignment, _TEXT + +.endm + +CALL_SIGNAL_HANDLER_WRAPPER 0 +CALL_SIGNAL_HANDLER_WRAPPER 8 |