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Vol. 2A 3-483
INSTRUCTION SET REFERENCE, A-M
INT n/INTO/INT 3—Call to Interrupt Procedure
Real-Address Mode Exceptions
#GP If a memory operand effective address is outside the CS, DS,
ES, FS, or GS segment limit.
If the interrupt vector number is outside the IDT limits.
#SS If stack limit violation on push.
If pushing the return address, flags, or error code onto the stack
exceeds the bounds of the stack segment.
#UD If the LOCK prefix is used.
Virtual-8086 Mode Exceptions
#GP(0) (For INT n, INTO, or BOUND instruction) If the IOPL is less than
3 or the DPL of the interrupt-, trap-, or task-gate descriptor is
not equal to 3.
If the instruction pointer in the IDT or in the interrupt-, trap-, or
task gate is beyond the code segment limits.
#GP(selector) If the segment selector in the interrupt-, trap-, or task gate is
NULL.
If a interrupt-, trap-, or task gate, code segment, or TSS
segment selector index is outside its descriptor table limits.
If the interrupt vector number is outside the IDT limits.
If an IDT descriptor is not an interrupt-, trap-, or task-descriptor.
If an interrupt is generated by the INT n instruction and the DPL
of an interrupt-, trap-, or task-descriptor is less than the CPL.
If the segment selector in an interrupt- or trap-gate does not
point to a segment descriptor for a code segment.
If the segment selector for a TSS has its local/global bit set for
local.
#SS(selector) If the SS register is being loaded and the segment pointed to is
marked not present.
If pushing the return address, flags, error code, stack segment
pointer, or data segments exceeds the bounds of the stack
segment.
#NP(selector) If code segment, interrupt-, trap-, or task gate, or TSS is not
present.
#TS(selector) If the RPL of the stack segment selector in the TSS is not equal
to the DPL of the code segment being accessed by the interrupt
or trap gate.
If DPL of the stack segment descriptor for the TSS’s stack
segment is not equal to the DPL of the code segment descriptor
for the interrupt or trap gate.
If the stack segment selector in the TSS is NULL.