Invalid Floating-Point Stack Operation

An invalid floating-point stack check is raised when a floating-point processor attempts an illegal operation on a private stack. The Intel 80387 processor maintains eight internal 10-byte "registers" that are individually addressable and yet behave as a push-down stack under the influence of the FLD (push real) and FST (pop real to destination) instructions. Overflow and underflow are checked with each instruction, and this exception is raised when appropriate. This is one of the class of exceptions for which the Intel 80387 processor signals the Intel 80386 processor to raise trap #16. This exception is continuable.