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Intel architecture ia-32 User Manual

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5-40 Vol. 3A
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 5-6 shows
the conditions that cause an invalid TSS exception to be generated.
Table 5-6.  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.
Stack segment selector index
The stack segment selector exceeds descriptor table limit.
Stack segment selector index
The stack segment selector is NULL.
Stack segment selector index
The stack segment descriptor is a non-data segment.
Stack segment selector index
The stack segment is not writable.
Stack segment selector index
The stack segment DPL != CPL.
Stack segment selector index
The stack segment selector RPL != CPL.