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6-42 Vol. 3
INTERRUPT AND EXCEPTION HANDLING
Interrupt 10—Invalid TSS Exception (#TS)
Exception Class Fault.
Description
Indicates that there was an error related to a TSS. Such an error might be detected
during a task switch or during the execution of instructions that use information from
a TSS.
Table 6-6 shows the conditions that cause an invalid TSS exception to be
generated.
Table 6-6. Invalid TSS Conditions
Error Code Index Invalid Condition
TSS segment selector index The TSS segment limit is less than 67H for 32-bit TSS or less than
2CH for 16-bit TSS.
TSS segment selector index During an IRET task switch, the TI flag in the TSS segment selector
indicates the LDT.
TSS segment selector index During an IRET task switch, the TSS segment selector exceeds
descriptor table limit.
TSS segment selector index During an IRET task switch, the busy flag in the TSS descriptor
indicates an inactive task.
TSS segment selector index During an IRET task switch, an attempt to load the backlink limit
faults.
TSS segment selector index During an IRET task switch, the backlink is a NULL selector.
TSS segment selector index During an IRET task switch, the backlink points to a descriptor
which is not a busy TSS.
TSS segment selector index The new TSS descriptor is beyond the GDT limit.
TSS segment selector index The new TSS descriptor is not writable.
TSS segment selector index Stores to the old TSS encounter a fault condition.
TSS segment selector index The old TSS descriptor is not writable for a jump or IRET task
switch.
TSS segment selector index The new TSS backlink is not writable for a call or exception task
switch.
TSS segment selector index The new TSS selector is null on an attempt to lock the new TSS.
TSS segment selector index The new TSS selector has the TI bit set on an attempt to lock the
new TSS.
TSS segment selector index The new TSS descriptor is not an available TSS descriptor on an
attempt to lock the new TSS.
LDT segment selector index LDT or LDT not present.