Vol. 3A 6-25

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.

Exception Error Code

None.

Saved Instruction Pointer

The saved contents of CS and EIP registers point to the BOUND instruction that generated the 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 exception handler causes the BOUND 
instruction to be restarted.