Exception Error Codes
The processor pushes a 32-bit error code (if the current code segment's default operand size is 16-bits, it's a 16-bit error code) onto the stack for certain types of software exception conditions. Table 14-8 on page 287 lists the exceptions that return error codes. The format of the error code is shown in Figure 14-13 on page 290. The error code indicates the following:
The EXT bit = 1 if an event external to the program caused the error. As an example, EXT = 1 if a hardware interrupt selected a Task Gate pointing to an invalid TSS selector in the IDT.
The IDT bit = 1 if the error is associated with an entry in the IDT. In this case, the Selector Index field indicates the IDT entry in question.
A zero in the IDT bit indicates ...
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