Beginning x64 Assembly Programming: From Novice to AVX Professional

© Jo Van Hoey 2019

J. Van HoeyBeginning x64 Assembly Programminghttps://doi.org/10.1007/978-1-4842-5076-1_4

4. Your Next Program: Alive and Kicking!

Jo Van Hoey¹ 

(1)

Hamme, Belgium

 

Now that you have a firm grasp of GDB and know what an assembly program looks like, let’s add some complexity. In this chapter, we will show how to obtain the length of a string variable. We will show how to print integer and floating-point values using printf. And we will expand your knowledge of GDB commands.

Listing 4-1 contains the example code that we will use to show how we can find the length of a string and how numeric values are stored in memory.

;alive.asm

section .data

      msg1   db    "Hello, World!",10,0       ; string with NL and 0

      msg1Len      equ    $-msg1-1     ; ...