Intel IA-32 Manuale Utente
5-32 Vol. 3A
INTERRUPT AND EXCEPTION HANDLING
Interrupt 5—BOUND Range Exceeded Exception (#BR)
Exception Class
Fault.
Description
Indicates that a BOUND-range-exceeded fault occurred when a BOUND instruction was
executed. The BOUND instruction checks that a signed array index is within the upper and
lower bounds of an array located in memory. If the array index is not within the bounds of the
array, a BOUND-range-exceeded fault is generated.
executed. The BOUND instruction checks that a signed array index is within the upper and
lower bounds of an array located in memory. If the array index is not within the bounds of the
array, a BOUND-range-exceeded fault is generated.
Exception Error Code
None.
Saved Instruction Pointer
The saved contents of CS and EIP registers point to the BOUND instruction that generated the
exception.
exception.
Program State Change
A program-state change does not accompany the bounds-check fault, because the operands for
the BOUND instruction are not modified. Returning from the BOUND-range-exceeded excep-
tion handler causes the BOUND instruction to be restarted.
the BOUND instruction are not modified. Returning from the BOUND-range-exceeded excep-
tion handler causes the BOUND instruction to be restarted.