Functions in Frame Pointers and Local Variables
Explore how to analyze function prolog and epilog sequences in assembly for x64 architecture. Understand the role of frame pointers and how local variables are managed on the stack. Gain practical skills in using GDB commands to inspect registers, disassemble functions, and interpret stack frames to debug C programs effectively.
We'll cover the following...
We'll cover the following...
Function prolog
The sequence of instructions that initializes the %RBP register and makes room for local variables is called a function prolog. One example is pictured below, where func calls func2, which has one local variable var. Sometimes saving necessary registers is also considered part of a function prolog.
Raw stack (no local variables and function parameters)
Now we can understand additional data–the previous %RBP that was equal to the previous %RSP ...