About

An exception is an event that occurs when:

• when an instruction causes an error. Example:
  • an attempt to divide by zero generates an exception
  • overflow
• at a breakpoints

Some types of exceptions may provide error codes. An error code reports additional information about the error.

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Notation

An example of the notation used to show an exception and error code is shown below:

#PF(fault code)

where:

• PF refers to page-fault exception
• fault code is an error code naming a type of fault (Default to zero)

Handler

When a call is made to an exception handler procedure, the processor automatically saves the state of the EFLAGS register on the procedure stack. When an exception is handled with a task switch, the state of the EFLAGS register is saved in the TSS for the task being suspended.

Documentation / Reference

• https://software.intel.com/en-us/download/intel-64-and-ia-32-architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4