diff options
Diffstat (limited to 'src/pal/src/arch/amd64/dispatchexceptionwrapper.S')
| -rw-r--r-- | src/pal/src/arch/amd64/dispatchexceptionwrapper.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/pal/src/arch/amd64/dispatchexceptionwrapper.S b/src/pal/src/arch/amd64/dispatchexceptionwrapper.S new file mode 100644 index 0000000000..ee5ff468d6 --- /dev/null +++ b/src/pal/src/arch/amd64/dispatchexceptionwrapper.S @@ -0,0 +1,51 @@ +// 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. + +// ==++== +// + +// ==--== +// +// Implementation of the PAL_DispatchExceptionWrapper that is +// interposed between a function that caused a hardware fault +// and PAL_DispatchException that throws an SEH exception for +// the fault, to make the stack unwindable. +// + +.intel_syntax noprefix +#include "unixasmmacros.inc" + +// Offset of the return address from the PAL_DispatchException in the PAL_DispatchExceptionWrapper +.globl C_FUNC(PAL_DispatchExceptionReturnOffset) +C_FUNC(PAL_DispatchExceptionReturnOffset): + .int LOCAL_LABEL(PAL_DispatchExceptionReturn) - C_FUNC(PAL_DispatchExceptionWrapper) + +// +// PAL_DispatchExceptionWrapper will never be called; it only serves +// to be referenced from a stack frame on the faulting thread. Its +// unwinding behavior is equivalent to any standard function having +// an ebp frame. It is analogous to the following source file. +// +// extern "C" void PAL_DispatchException(CONTEXT *pContext, EXCEPTION_RECORD *pExceptionRecord, MachExceptionInfo *pMachExceptionInfo); +// +// extern "C" void PAL_DispatchExceptionWrapper() +// { +// CONTEXT Context; +// EXCEPTION_RECORD ExceptionRecord; +// MachExceptionInfo MachExceptionInfo; +// PAL_DispatchException(&Context, &ExceptionRecord, &MachExceptionInfo); +// } +// + +NESTED_ENTRY PAL_DispatchExceptionWrapper, _TEXT, NoHandler + push_nonvol_reg rbp + mov rbp, rsp + set_cfa_register rbp, (2*8) + int3 + call C_FUNC(PAL_DispatchException) +LOCAL_LABEL(PAL_DispatchExceptionReturn): + int3 + pop_nonvol_reg rbp + ret +NESTED_END PAL_DispatchExceptionWrapper, _TEXT |