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XEROX Mesa Processor Principles of Operation Version 4.0 May 1985 Office Systems Division 2400 Geng Road Palo Alto, California 94303 J. Mesa Processor Principles of Operation Notice This document is being provided for information only. Xerox makes no warranties or representations of any kind relative to this document or its use, including implied warranties of merchantability or of fitness for a particular purpose. Xerox assumes no responsibility or liability for any errors or inaccuracies that may be contained in the document, and does not guarantee that the use of the information herein will function or perform in an intended manner. The information contained herein is subject to change without any obligation of notice on the part of Xerox. /. Copyright c> 1985 by Xerox Corporation. All Rights Reserved. Table of contents 1 Introduction 1.1 Technical Summary 1-2 1.1.1 High Level Languages . 1-2 1.1.2 Compact Program Representation . 1-2 1.1.3 Compact Data Representation . 1-3 1.1.4 Read Only Relocatable Code 1-3 1.1.5 Stack Machine . 1-3 1.1.6 Control Transfers . 1-3 1.1.7 Process Mechanism 1-3 1.1.8 Virtual Memory 1-4 1.1.9 Protection . 1-4 1.2 Terminology . ., 1-4 1.2.1 Architecture 1-4 1.2.2 Processor 1-4 1.2.3 Programmer 1-5 1.3 Conventions . 1-5 1.3.1 Type Checking. 1-6 1.3.2 Type Representation 1-6 1.3.3 Subrange Types 1-6 1.3.4 Enumerated Types. 1-6 1.3.5 Pointers 1-6 1.3.6 Arrays and Records 1-7 1.3.7 Type Conversion 1-7 1.3.8 Built-in Routines 1-7 1.3.9 Control Flow 1-7 1.3.10 Signals and Errors . 1-7 1.3.11 Instruction Descriptions 1-8 i Table of contents 2 Data Types 2.1 Basic Data Types 2-1 2.1.1 Unspecified 2-2 2.1.2 Bit, Nibble, Byte 2-2 2.1.3 Basic Operators 2-2 2.2 Numeric Types 2-3 2.2.1 Cardinal 2-4 2.2.2 Integer.