© 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 
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.
section .data
      msg1   db    "Hello, World!",10,0       ; string with NL and 0
      msg1Len      equ    $-msg1-1     ; ...

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