x86-64 Assembly Segfault on printf? Fix Stack Alignment (Yasm + GCC Demo)

Your x86-64 assembly program looks correct, links with GCC, calls printf, and then crashes with a segfault. This video shows exactly why it happens and how to fix it.

We build a hybrid program using Yasm and GCC on Linux, print a message from C++, call an assembly function, and hit the crash. Then we fix it with a push and pop of RAX, move the fix into the function prologue and epilogue, and run experiments to prove it works.

No long lectures, just code, a real crash, and a real solution that stops the problem for good.

Introduction 00:00:00
Hybrid Programs 00:00:09
Stack Alignment Problem 00:00:33
GCC Stack Expectations 00:01:14
Makefile Overview 00:02:22
Driver Code 00:03:16
Assembly Module Setup 00:04:12
Calling printf 00:05:20
Program Crash Demo 00:07:17
Diagnosing Segfault 00:07:56
Fix with Push-Pop 00:09:08
Prologue Epilogue Fix 00:11:18
Experiments Confirm 00:12:54
Conclusion 00:13:32
Outro Thanks 00:13:52

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