The Call Stack Explained: Call Frames, Return Addresses, Local Variables
Posted inAssembly Language Coding Computer Science

The Call Stack Explained: Call Frames, Return Addresses, Local Variables

The call stack is a special stack data structure that your computer uses to manage function calls. Every time a function is called, a call frame is pushed onto the stack containing the return address, function arguments (beyond what fits in registers), preserved registers, and space for local variables. When the function returns, its call frame is popped and execution jumps back to the return address - this is how your program knows exactly where to continue after a function finishes.
Mixed Function Arguments in x86-64 Assembly – Integers & Floats Explained
Posted inAssembly Language Coding Computer Science

Mixed Function Arguments in x86-64 Assembly – Integers & Floats Explained

In the System V x86-64 ABI, integer and floating-point arguments use separate register assignment sequences. Integer arguments go into rdi, rsi, rdx, rcx, r8, r9 (then stack), while floating-point arguments use xmm0 through xmm7 independently. This means the first integer you see — even if it appears after several doubles — always goes into rdi, and the second float always goes into xmm1 regardless of how many integers came before it.
x86-64 Assembly Pointers & Dereferencing Explained – Hybrid C++/YASM Example
Posted inAssembly Language Coding Computer Science

x86-64 Assembly Pointers & Dereferencing Explained – Hybrid C++/YASM Example

This video explains pointers and dereferencing in x86-64 YASM assembly and demonstrates passing pointers between assembly and C++ in a hybrid program. We show how to read a C string from assembly, modify a long via pointer dereference so the change is visible in C++, and send assembly-owned data (string, long, double) back to C++ using pointers.
x86-64 Assembly While Loops Explained Step by Step in YASM – From Concept to Working Program
Posted inAssembly Language Coding Computer Science

x86-64 Assembly While Loops Explained Step by Step in YASM – From Concept to Working Program

This video teaches how to implement a classic while loop structure in x86-64 assembly language using YASM. We cover the conceptual mapping from C-style while(condition) { body } to assembly labels (while_top, while_body, while_done), conditional jumps (jne, je, etc.), and the unconditional jump back to the top of the loop. A complete runnable example repeatedly reads integers from the user and echoes them until 99 is entered.