Assembly Language Step-by-Step Assembly Language Step-by-Step ® Programming with Linux Third Edition Jeff Duntemann Wiley Publishing, Inc. AssemblyLanguageStep-by-Step Publishedby WileyPublishing,Inc. 10475CrosspointBoulevard Indianapolis,IN46256 www.wiley.com Copyright©2009byJeffDuntemann PublishedbyWileyPublishing,Inc.,Indianapolis,Indiana PublishedsimultaneouslyinCanada ISBN:978-0-470-49702-9 ManufacturedintheUnitedStatesofAmerica 10987654321 Nopartofthispublicationmaybereproduced,storedinaretrievalsystemortransmittedinanyformorbyanymeans, electronic,mechanical,photocopying,recording,scanningorotherwise,exceptaspermittedunderSections107or108 ofthe1976UnitedStatesCopyrightAct,withouteitherthepriorwrittenpermissionofthePublisher,orauthorization throughpaymentoftheappropriateper-copyfeetotheCopyrightClearanceCenter,222RosewoodDrive,Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600. Requests to the Publisher for permission should be addressed to the PermissionsDepartment,JohnWiley&Sons,Inc.,111RiverStreet,Hoboken,NJ07030,(201)748-6011,fax(201)748-6008, oronlineathttp://www.wiley.com/go/permissions. LimitofLiability/DisclaimerofWarranty:Thepublisherandtheauthormakenorepresentationsorwarrantieswith respecttotheaccuracyorcompletenessofthecontentsofthisworkandspecificallydisclaimallwarranties,including withoutlimitationwarrantiesoffitnessforaparticularpurpose.Nowarrantymaybecreatedorextendedbysalesor promotionalmaterials.Theadviceandstrategiescontainedhereinmaynotbesuitableforeverysituation.Thiswork issoldwiththeunderstandingthatthepublisherisnotengagedinrenderinglegal,accounting,orotherprofessional services.Ifprofessionalassistanceisrequired,theservicesofacompetentprofessionalpersonshouldbesought.Neither thepublishernortheauthorshallbeliablefordamagesarisingherefrom.ThefactthatanorganizationorWebsiteis referredtointhisworkasacitationand/orapotentialsourceoffurtherinformationdoesnotmeanthattheauthororthe publisherendorsestheinformationtheorganizationorWebsitemayprovideorrecommendationsitmaymake.Further, readersshouldbeawarethatInternetWebsiteslistedinthisworkmayhavechangedordisappearedbetweenwhenthis workwaswrittenandwhenitisread. ForgeneralinformationonourotherproductsandservicespleasecontactourCustomerCareDepartmentwithinthe UnitedStatesat(877)762-2974,outsidetheUnitedStatesat(317)572-3993orfax(317)572-4002. Wileyalsopublishesitsbooksinavarietyofelectronicformats.Somecontentthatappearsinprintmaynotbeavailable inelectronicbooks. LibraryofCongressControlNumber:2009933745 Trademarks:WileyandtheWileylogoaretrademarksorregisteredtrademarksofJohnWiley&Sons,Inc.and/orits affiliates,intheUnitedStatesandothercountries,andmaynotbeusedwithoutwrittenpermission.Linuxisaregistered trademarkofLinusTorvalds.Allothertrademarksarethepropertyoftheirrespectiveowners.WileyPublishing,Inc.is notassociatedwithanyproductorvendormentionedinthisbook. To the eternal memory of Kathleen M. Duntemann, Godmother 1920–1999 who gave me books when all I could do was put teeth marks on them. There are no words for how much I owe you! About the Author JeffDuntemannisawriter,editor,lecturer,andpublishingindustryanalyst.In histhirtyyearsinthetechnologyindustryhehasbeenacomputerprogrammer and systems analyst for Xerox Corporation, a technical journal editor for Ziff-Davis Publications, and Editorial Director for Coriolis Group Books and laterParaglyphPress.Heiscurrentlyatechnicalpublishingconsultantandalso owns Copperwood Press, a POD imprint hosted on lulu.com. Jeff lives with hiswifeCarolinColoradoSprings,Colorado. vii