Learn to Program with Assembly by Jonathan Bartlett

Author:Jonathan Bartlett
Language: eng
Format: epub
ISBN: 9781484274378
Publisher: Apress

12. Calling Functions from Libraries

Jonathan Bartlett1

(1)Tulsa, OK, USA

In Chapter 11, we learned how to structure our code into functions so that other code can call these functions in a standardized way. However, your computer already comes preloaded with thousands of functions already built which you can call. In this chapter, we will look at how to call those functions, as well as some of the more helpful ones that are available.

The actual process of calling these functions you already know. If you know the name of a function, and you know its parameters, then you know the assembly language instructions to call it—move the parameters to the correct registers, save any registers that are not guaranteed to be preserved to the stack, and then call the function.

The questions, then, are, (a) how do we know what functions are available, (b) how do we learn what the parameters are, and (c) how do we include these functions in our program?

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