September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Direct system calls
Using one of the preceding instructions would mean making a direct system call and bypassing all system libraries as shown in the following figure. However, this is not the best practice and we will see why in a moment:
Using the direct system call approach on Linux would, most likely, work, as Linux system calls are well documented and their numbers are well known (they may be found in /usr/include/asm/unistd_32.h for a 32-bit system and in /usr/include/asm/unistd_64.h for a 64-bit one), and those numbers do not tend to change. For example, the following code prints a msg string to the standard output on a 32-bit Linux ...
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