lesson 10 and 11 assembly

Assembly Intro

Assembly doesn't have high level abstraction and stuff I guess idk

Instruction set architecture
- CISC-- x64 (intel x86 64 bit), IA32 (32 bit)
- RISC -- Acorn Risc Machine (ARM), MIPS, PowerPC

Register: word sized storage unit on the CPU that holds instructions, addresses, and/or data
CPU has 16 total registers for storing integer data and pointers-- see slides for the list of registers
If a thing has fewer than 8 bytes (64-bit), it may use component registers

use "disas functionname" in gdb to show assembly code shit

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Lesson 11

Program memory: address space that OS assigns an executable when it is run
Program stack aka call stack: Section of memory that stores parametres and local variables of a function.  It grows towards lower addresses during execution and shrinks back to original size when the function exits

mov, add, sub, push, pop
stack = %rsp