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Where indeed If you've followed me this far, you've been exposed to nearly every concept commonly used in assembly language work As a working environment we've been using MS-DOS, which made a lot of things easier made most of it possible, in fact DOS is simple, forgiving, and present in nearly all Windows machines either as a lurker-beneath-the-windows (for Windows 9x) or a very high quality emulation (Windows NT) Either way, it was likely that you had access to DOS if you had a PC anywhere in your life The trouble is, DOS is the past At best, it's a training ground for understanding the environments where all the real action is now taking place And that's basically one of two places these days: Windows and Unix Most other environments have withered severely and exist primarily as "legacy support" that is, for people who can't afford the money or effort required to move from where they are to Windows or Unix On the x86 family of processors (which is what we've been discussing), the undisputed king of Unix implementations is Linux And where we're going is Linux It's a true 32-bit protected mode operating system, and it offers the chance to create real 32-bit flat model programs in assembly without a prohibitive amount of head banging So, what remains of this book will serve to get you started on learning assembly coding for Linux
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The first edition of this book was published in 1992 In the last few years, I've received many letters from readers of the first edition, requesting a second edition that explained how to write Microsoft Windows programs in assembly code I looked into it I paled And I shook my head Don't go there you may never come back The problem is this: A Windows application isn't so much a stand-alone program as a custom-built extension of Windows itself A DOS assembly program begins at the top, runs down from there, may do some looping back, but eventually it ends It may touch the operating system from time to time by making system calls, but the nature of those calls is simple: You set up some parameters in registers or on the stack, and you make an INT 21H call into DOS When DOS does what it must, it returns control to your program That's about all there is to it The relationship between Windows and its applications is much closer and far more complex When a Windows program is running and the user presses a mouse button, Windows intercepts the mouse signal and (in effect) taps your program on the shoulder and whispers: "The user just clicked the right mouse button What are you going to do about it " A tremendously complex system of events and responses, of messages passed and messages intercepted, runs through Windows and all of its applications like the threads of water flowing over a rocky streambed From a distance, it's gorgeous Up close, it borders on chaotic And in assembly language, you're up as close as it gets Just understanding how Windows and Windows applications work at the assembly level could take you months of study Coding a sizeable app could take a year Balance against this the fact that a lot of the work in dealing with Windows is always done in precisely the same ways, and you have a tailor-made excuse for drop-in software components and boilerplate code This is what you get with programming environments like Visual C++, Visual Basic, and Delphi, which basically hand you a generic Windows program with all the infrastructure in place windows, scroll bars, mouse support, the works but nothing in the line of specifics Nonetheless, getting that massive a head start pretty much eliminates any advantage you might have in working in assembly But what about speed and size Nothing beats assembly at speed and size, right Well, nothing beats good assembly at the speed and size game However you need to keep in mind that when a
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Windows application is running, much or even most of the time code execution is actually somewhere down in Windows, executing DLLs or other Windows machinery that you have no control over The parts that you actually write will not likely be what dominate the user's perception of the application's speed Besides, today's C and Pascal compilers have gotten mighty damned good at generating near-optimal machine code for a specified sequence of high-level language statements Ace assembly hacks can do better, but it's a little discouraging to ponder just how close to your heels the wolves are snapping In truth, coding in assembly for Windows is good for one thing and one thing only: to gain a bit-level, way-down-deep under-the-skin understanding of how Windows works This can be a very good and valuable thing, and if you want to pursue it, I salute you I also suspect that once you gain that hardwon understanding of Windows internals, you'll run screaming to the most efficient Windows RAD (Rapid Application Development) environment you can find (For me, that was Delphi) Only one book to my knowledge has ever been written about coding in assembly for Windows: Windows Assembly Language and Systems Programming, by Barry Kauler (R & D Books, 1997) And for all that it's 400 pages long, it's only a start Most of what you need to know will have to be found elsewhere, in Microsoft's massive technical documentation Good luck Heh-heh You'll need it
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