advanced patterns When Using NASM to Implement Recursive Factorial in x86 Assembly
I'm trying to implement a recursive factorial function in x86 assembly using NASM on a Linux environment. The function seems to produce incorrect results for larger inputs, specifically when I try to calculate `factorial(6)`. Instead of returning `720`, it gives me `0`. Here's the code snippet I have: ```nasm section .data result dd 0 section .text global _start _start: mov eax, 6 ; Input value for factorial call factorial mov [result], eax ; Store the result ; Exit the program mov eax, 1 int 0x80 factorial: cmp eax, 1 jle .base_case push eax dec eax call factorial pop eax imul eax, eax, [esp] ret .base_case: mov eax, 1 ret ``` I suspect the question might be related to how I'm managing the stack, particularly with the push/pop operations. When I step through the code with a debugger, the value of `eax` seems to be corrupted by the recursive calls. Additionally, I'm not sure if I'm correctly handling the base case since I return `1` directly instead of adjusting the stack properly. Any insights on what I'm doing wrong? I have tried simplifying the function to just return `1` for the base case, and it still produces odd results. I'm using NASM version 2.15.05 and running on Ubuntu 20.04.