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Included an image to help understand the stack.

yatesal 2018-05-20 23:24:38 -07:00
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Basic-Assembly-tutorial.md

@ -441,6 +441,6 @@ To understand this example, we must first understand what is the **stack**. The
We use the term *push* when we add a piece of data on top of the stack and *pop* when we remove a piece of data from the stack. We use the term *push* when we add a piece of data on top of the stack and *pop* when we remove a piece of data from the stack.
Visual representation of the stack: Visual representation of the stack:
![Visual representation of the stack](link to picture) ![Visual representation of the stack](https://user-images.githubusercontent.com/25143248/40293017-a0faff04-5c83-11e8-8a84-75ea058b8655.png)
We can notice that this implementation of the stack is actually upside-down compared to a real-world stack of items: the stack grows downwards in memory, towards lower addresses. The important thing to remember is that the bottom of the stack is at a fixed address and that the top of the stack changes when an item is *pushed* on the stack or *popped* out. In the game's CPU, the **stack pointer** (SP) register always points to the top of the stack and the **base pointer** always points to the base of the current **stack frame**. We can notice that this implementation of the stack is actually upside-down compared to a real-world stack of items: the stack grows downwards in memory, towards lower addresses. The important thing to remember is that the bottom of the stack is at a fixed address and that the top of the stack changes when an item is *pushed* on the stack or *popped* out. In the game's CPU, the **stack pointer** (SP) register always points to the top of the stack and the **base pointer** always points to the base of the current **stack frame**.