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Vol. 3A 5-15

INTERRUPT AND EXCEPTION HANDLING

through Section 4.8.6, “Returning from a Called Procedure”). If index points to a task gate, the

processor executes a task switch to the exception- or interrupt-handler task in a manner similar

to a CALL to a task gate (see Section 6.3, “Task Switching”).

5.12.1 Exception- or Interrupt-Handler Procedures

An interrupt gate or trap gate references an exception- or interrupt-handler procedure that runs

in the context of the currently executing task (see Figure 5-3). The segment selector for the gate

points to a segment descriptor for an executable code segment in either the GDT or the current

LDT. The offset field of the gate descriptor points to the beginning of the exception- or interrupt-

handling procedure.

Figure 5-3. Interrupt Procedure Call

IDT

Interrupt or

Code Segment

Segment Selector

GDT or LDT

Segment

Interrupt

Vector

Base

Address

Destination

Procedure

Interrupt

Descriptor

Trap Gate

Offset

1 2 ... 186 187 188 189 190 191 192 193 194 195 196 ... 635 636

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