Exception Codes

This topic describes the following types of exceptions:

RTX exceptions
Intel exceptions

RTX Exception Codes

The table that follows lists the exception name, the vector number or error code, and the exception handler response.

Exception	Error code	RTX will...
EXCEPTION_NPX_NOT_AVAILABLE	0X07	Allow for floating-point capability, and continue executing the application.
EXCEPTION_INT3	0x03	Enter the debugger. If no debugger is present, RTX freezes the process.
EXCEPTION_NMI EXCEPTION_DOUBLE_FAULT EXCEPTION_RESERVED_TRAP EXCEPTION_INVALID_TSS	0x02 0x08 0x0F 0x0A	Issue a Green Screen stop message.

Intel Exception Codes

Following Win32 behavior, RTSS maps the Intel (x86) exception code to the Win32 one, and then invokes Structured Exception Handling. RTX will alert the user via a popup message, make an entry to the event log, and freeze or terminate the thread and associated process.

x86 Exception	Win32 Mapping
EXCEPTION_DIVIDED_BY_ZERO	EXCEPTION_INT_DIVIDE_BY_ZERO EXCEPTION_FLT_DIVIDE_BY_ZERO
EXCEPTION_NPX_OVERRUN	EXCEPTION_FLT_INVALID_OPERATION
EXCEPTION_NPX_ERROR	EXCEPTION_FLT_DENORMAL_OPERAND EXCEPTION_FLT_DIVIDE_BY_ZERO EXCEPTION_FLT_OVERFLOW EXCEPTION_FLT_UNDERFLOW EXCEPTION_FLT_INEXACT_RESULT EXCEPTION_FLT_INVALID_OPERATION
EXCEPTION_INVALID_OPCODE	EXCEPTION_ILLEGAL_INSTRUCTION
EXCEPTION_GP_FAULT EXCEPTION_PAGE_FAULT EXCEPTION_BOUND_CHECK EXCEPTION_SEGMENT_NOT_PRESENT	EXCEPTION_ACCESS_VIOLATION
EXCEPTION_DEBUG	EXCEPTION_BREAKPOINT
EXCEPTION_ALIGNMENT_CHECK	EXCEPTION_DATATYPE_MISALIGNMENT