Introduction to Assembly Programming with ARM - Preserving and Retrieving Data From Stack Memory

In this video, we will discuss how we can preserve registers on our stack memory before function calls, and pop them off the stack back into registers once the function is completed.
This video is part of my free course: Introduction to Assembly Programming in ARM, available here: olivestem.net/...
See all of our free courses at: olivestem.net/...

[@michaellaw2407]

10000X better explained than my Professor. 😁

[@nero008]

this series is true gold imo ! please make more of them !

[@olivestemlearning]

Thank you so much! I'm so happy to hear this! There will be more videos coming soon

[@nero008]

@@olivestemlearning i am someone who is as far away from this field as possible but i always wanted to learn programming. Other tutorials use bunch of frameworks and other abstractions which i did not like. I really prefer this baremetal minimalist approach

[@hackvlix]

Second that!

[@cmdcs1]

Fantastic series! I've not found anything else quite like it on KZbin :)

[@olivestemlearning]

Thank you! I'm happy to hear the series has been valuable!

[@tech_azadi]

Should we initialize SP before calling a push. Is 0xFFFFFFFF default value for SP ?

[@olivestemlearning]

The SP register will generally point to the last item placed on the stack. I believe the default value is usually 0xFFFFFFFF for ARM. As the program runs, the SP register will update to reflect any data added to the stack, so you won't need to initialize it at all, ARM will handle the updates for the register.

[@vadimegorov9809]

Tiny mistake :) POP {R1, R0}

[@jacobyarnell715]

Hello, The order in which registers listed in the register list does not matter. When popping/pushing multiple registers, these registers are automatically sorted by name and the lowest-numbered register is loaded/stored from the lowest memory address, ie is loaded first/stored last

[@dreadesina5216]

@@jacobyarnell715 That's not correct the order does matter. Stack is just an array of memory the beginning being the sp[0] and the next sp[sp+1] which is 4 bytes since arm is 32 bits wide. Array is always contiguous and sequential. This is not a hash map or dictionary each data has a unique address so is the registers on the stack, the registers are order and have unique addresses the way they are push matter and so the way they will be pop. STACK mean last thing in first thing out. LIFO.

[@Nunya58294]

Took up ARM ASM for some projects so this will be extremely useful!