APPARATUS AND METHOD FOR EXECUTING MULTIPLE PROGRAM SEGMENTS WITH DIFFERENT OBJECT CODE TYPES IN SINGLE PROGRAM OR PROCESSOR ENVIRONMENT

摘要

PPROBLEM TO BE SOLVED: To provide a method and its apparatus for calling a program procedure, and switching performances of a plurality of object code types having various restrictions for a stack operation. PSOLUTION: A computer system characteristically includes a routine descriptor, a stack switch frame, a mode switching mechanism for switching a code or calling convention type from a first processor to a second processor and a means for performing instructions of various code types. The routine descriptor describes a program, or a code segment, its code type and the calling conventions. In encountering the instructions, control is transferred to the mode switching mechanism. When a routine calls the routine including another stack model, the mode switching mechanism uses the stack switch frame in order to provide transfer between the two stack types. PCOPYRIGHT: (C)2007,JPO&INPIT