ASCII CONTROL CHARACTERS The following list shows the ASCII codes generated when a control key combination is pressed. The mnemonics and descriptions refer to ASCII functions used for screen and printer formatting and data communications. ASCII ASCII Code* Ctrl- Mnemonic Description Code* Ctrl- Mnemonic Description 00 NUL Null character 10 Ctrl-P DLE Data link escape 01 Ctrl-A SOH Start of header 11 Ctrl-Q DC1 Device control 1 02 Ctrl-B STX Start of text 12 Ctrl-R DC2 Device control 2 03 Ctrl-C ETX End of text 13 Ctrl-S DC3 Device control 3 04 Ctrl-D EOT End of transmission 14 Ctrl-T DC4 Device control 4 05 Ctrl-E ENQ Enquiry 15 Ctrl-U NAK Negative acknowledge 06 Ctrl-F ACK Acknowledge 16 Ctrl-V SYN Synchronous idle 07 Ctrl-G BEL Bell 17 Ctrl-W ETB End transmission block 08 Ctrl-H BS Backspace 18 Ctrl-X CAN Cancel 09 Ctrl-I HT Horizontal tab 19 Ctrl-Y EM End of medium 0A Ctrl-J LF Line feed 1A Ctrl-Z SUB Substitute 0B Ctrl-K VT Vertical tab 1B Ctrl-I ESC Escape 0C Ctrl-L FF Form feed 1C Ctrl-\ FS File separator 0D Ctrl-M CR Carriage return 1D Ctrl-] GS Group separator 0E Ctrl-N SO Shift out 1E Ctrl- ^ RS Record separator 0F Ctrl-O SI Shift in 1F Ctrl-† US Unit separator * ASCII codes are in hexadecimal. † ASCII code 1Fh is Ctrl-Hyphen (-). ALT-KEY COMBINATIONS The following hexadecimal scan codes are produced by holding down the ALT key and pressing each character: Key Scan Code Key Scan Code Key Scan Code 1 78 A 1E N 31 2 79 B 30 O 18 3 7A C 2E P 19 4 7B D 20 Q 10 5 7C E 12 R 13 6 7D F 21 S 1F 7 7E G 22 T 14 8 7F H 23 U 16 9 80 I 17 V 2F 0 81 J 24 W 11 (cid:2) 82 K 25 X 2D (cid:3) 83 L 26 Y 15 M 32 Z 2C KEYBOARD SCAN CODES The following keyboard scan codes may be retrieved either by calling INT 16h or by calling INT 21h for keyboard input a second time (the first keyboard read returns 0). All codes are in hexadecimal: FUNCTION KEYS With With Key Normal Shift Ctrl With Alt F1 3B 54 5E 68 F2 3C 55 5F 69 F3 3D 56 60 6A F4 3E 57 61 6B F5 3F 58 62 6C F6 40 59 63 6D F7 41 5A 64 6E F8 42 5B 65 6F F9 43 5C 66 70 F10 44 5D 67 71 F11 85 87 89 8B F12 86 88 8A 8C With Key Alone Ctrl Key Home 47 77 End 4F 75 PgUp 49 84 PgDn 51 76 PrtSc 37 72 Left arrow 4B 73 Rt arrow 4D 74 Up arrow 48 8D Dn arrow 50 91 Ins 52 92 Del 53 93 Back tab 0F 94 Gray + 4E 90 Gray − 4A 8E Assembly Language for x86 Processors Seventh Edition KIP R. IRVINE Florida International University School of Computing and Information Sciences Boston Columbus Indianapolis New York San Francisco Upper Saddle River Amsterdam Cape Town Dubai London Madrid Milan Munich Paris Montreal Toronto Delhi Mexico City São Paulo Sydney Hong Kong Seoul Singapore Taipei Tokyo Vice President and Editorial Director, ECS: Marcia Horton Executive Editor: Tracy Johnson Executive Marketing Manager: Tim Galligan Marketing Assistant: Jon Bryant Program Management Team Lead: Scott Disanno Program Manager: Clare Romeo Project Manager: Greg Dulles Senior Operations Specialist: Nick Sklitsis Operations Specialist: Linda Sager Permissions Project Manager: Karen Sanatar Full-Service Project Management: Pavithra Jayapaul, Jouve Printer/Binder:Courier/Westford Typeface: Times IA-32, Pentium, i486, Intel64, Celeron, and Intel 386 are trademarks of Intel Corporation. Athlon, Phenom, and Opteron are trademarks of Advanced Micro Devices. TASM and Turbo Debugger are trademarks of Borland International. Microsoft Assembler (MASM), Windows Vista, Windows 7, Windows NT, Windows Me, Windows 95, Windows 98, Windows 2000, Windows XP, MS-Windows, PowerPoint, Win32, DEBUG, WinDbg, MS-DOS, Visual Studio, Visual C++, and CodeView are registered trademarks of Microsoft Corporation. Autocad is a trademark of Autodesk. Java is a trademark of Sun Microsystems. PartitionMagic is a trademark of Symantec. All other trademarks or product names are the property of their respective owners. Copyright © 2015, 2011, 2007, 2003 by Pearson Education, Inc., Upper Saddle River, New Jersey 07458. All rights reserved. Manufactured in the United States of America. This publication is protected by Copyright and permissions should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. To obtain permission(s) to use materials from this work, please submit a written request to Pearson Higher Education, Permissions Department, 1 Lake Street, Upper Saddle River, NJ 07458. Previously published as Assembly Language for Intel-Based Computers. The author and publisher of this book have used their best efforts in preparing this book. These efforts include the development, research, and testing of the theories and programs to determine their effectiveness. The author and pub- lisher make no warranty of any kind, expressed or implied, with regard to these programs or the documentation contained in this book. The author and publisher shall not be liable in any event for incidental or consequential damagesin connection with, or arising out of, the furnishing, performance, or use of these programs. Library of Congress Cataloging-in-Publication Data Irvine, Kip R., 1951- Assembly language for x86 processors / Kip R. Irvine, Florida International University, School of Computing and Information Sciences. — Seventh Edition. pages cm ISBN-13: 978-0-13-376940-1 ISBN-10: 0-13-376940-2 1. IBM microcomputers–Programming. 2. X86 assembly language (Computer program language) I. Title. QA76.8.I77 2014 005.265—dc23 2013046432 10 9 8 7 6 5 4 3 2 1 ISBN-13: 978-0-13-376940-1 ISBN-10: 0-13-376940-2 To Jack and Candy Irvine This page intentionally left blank Contents Preface xxiii 1 Basic Concepts 1 1.1 Welcome to Assembly Language 1 1.1.1 Questions You Might Ask 3 1.1.2 Assembly Language Applications 6 1.1.3 Section Review 6 1.2 Virtual Machine Concept 7 1.2.1 Section Review 9 1.3 Data Representation 9 1.3.1 Binary Integers 10 1.3.2 Binary Addition 12 1.3.3 Integer Storage Sizes 13 1.3.4 Hexadecimal Integers 13 1.3.5 Hexadecimal Addition 15 1.3.6 Signed Binary Integers 16 1.3.7 Binary Subtraction 18 1.3.8 Character Storage 19 1.3.9 Section Review 21 1.4 Boolean Expressions 22 1.4.1 Truth Tables for Boolean Functions 24 1.4.2 Section Review 26 1.5 Chapter Summary 26 1.6 Key Terms 27 1.7 Review Questions and Exercises 28 1.7.1 Short Answer 28 1.7.2 Algorithm Workbench 30 2 x86 Processor Architecture 32 2.1 General Concepts 33 2.1.1 Basic Microcomputer Design 33 2.1.2 Instruction Execution Cycle 34 v vi Contents 2.1.3 Reading from Memory 36 2.1.4 Loading and Executing a Program 36 2.1.5 Section Review 37 2.2 32-Bit x86 Processors 37 2.2.1 Modes of Operation 37 2.2.2 Basic Execution Environment 38 2.2.3 x86 Memory Management 41 2.2.4 Section Review 42 2.3 64-Bit x86-64 Processors 42 2.3.1 64-Bit Operation Modes 43 2.3.2 Basic 64-Bit Execution Environment 43 2.4 Components of a Typical x86 Computer 44 2.4.1 Motherboard 44 2.4.2 Memory 46 2.4.3 Section Review 46 2.5 Input–Output System 47 2.5.1 Levels of I/O Access 47 2.5.2 Section Review 49 2.6 Chapter Summary 50 2.7 Key Terms 51 2.8 Review Questions 52 3 Assembly Language Fundamentals 53 3.1 Basic Language Elements 54 3.1.1 First Assembly Language Program 54 3.1.2 Integer Literals 55 3.1.3 Constant Integer Expressions 56 3.1.4 Real Number Literals 57 3.1.5 Character Literals 57 3.1.6 String Literals 58 3.1.7 Reserved Words 58 3.1.8 Identifiers 58 3.1.9 Directives 59 3.1.10 Instructions 60 3.1.11 Section Review 63 3.2 Example: Adding and Subtracting Integers 63 3.2.1 The AddTwo Program 63 3.2.2 Running and Debugging the AddTwo Program 65 3.2.3 Program Template 70 3.2.4 Section Review 70 Contents vii 3.3 Assembling, Linking, and Running Programs 71 3.3.1 The Assemble-Link-Execute Cycle 71 3.3.2 Listing File 71 3.3.3 Section Review 73 3.4 Defining Data 74 3.4.1 Intrinsic Data Types 74 3.4.2 Data Definition Statement 74 3.4.3 Adding a Variable to the AddTwo Program 75 3.4.4 Defining BYTE and SBYTE Data 76 3.4.5 Defining WORD and SWORD Data 78 3.4.6 Defining DWORD and SDWORD Data 79 3.4.7 Defining QWORD Data 79 3.4.8 Defining Packed BCD (TBYTE) Data 80 3.4.9 Defining Floating-Point Types 81 3.4.10 A Program That Adds Variables 81 3.4.11 Little-Endian Order 82 3.4.12 Declaring Uninitialized Data 83 3.4.13 Section Review 83 3.5 Symbolic Constants 84 3.5.1 Equal-Sign Directive 84 3.5.2 Calculating the Sizes of Arrays and Strings 85 3.5.3 EQU Directive 86 3.5.4 TEXTEQU Directive 87 3.5.5 Section Review 88 3.6 64-Bit Programming 88 3.7 Chapter Summary 90 3.8 Key Terms 91 3.8.1 Terms 91 3.8.2 Instructions, Operators, and Directives 92 3.9 Review Questions and Exercises 92 3.9.1 Short Answer 92 3.9.2 Algorithm Workbench 93 3.10 Programming Exercises 94 4 Data Transfers, Addressing, and Arithmetic 95 4.1 Data Transfer Instructions 96 4.1.1 Introduction 96 4.1.2 Operand Types 96 4.1.3 Direct Memory Operands 96