From 26b037391211c5b7283c9ecc60f956caefd29974 Mon Sep 17 00:00:00 2001
From: Joe Hunkeler <jhunkeler@gmail.com>
Date: Wed, 23 Sep 2015 22:40:26 -0400
Subject: commented

---
 prog3.asm | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 prog3.asm

(limited to 'prog3.asm')

diff --git a/prog3.asm b/prog3.asm
new file mode 100644
index 0000000..f5c0b7e
--- /dev/null
+++ b/prog3.asm
@@ -0,0 +1,61 @@
+;playing with the stack
+
+section .data
+arg	db	255
+
+section .text
+global _start
+
+uhh:
+	; save stack
+	push ebp
+	; create local stack
+	mov ebp, esp
+	; create "local" variable(s) by subtracting the stack by X bytes
+	sub ebp, 4
+
+	; first argument is 3 dwords (4 bytes * 3) in...
+	; copy first argument to eax
+	mov eax, [ebp+12]
+	
+	; mov eax (first arg) into local stack variable
+	mov [ebp-4], eax
+	; clear eax
+	mov eax, 0
+
+	; mov local variable into ebx 
+	mov ebx, [ebp-4]
+	
+	; reset stack pointer
+	; aka, giveth back what we taketh away
+	add ebp, 4
+
+	; restore stack
+	mov esp, ebp
+	pop ebp
+	ret
+
+_start:
+	; save stack
+	push ebp
+	mov ebp, esp
+
+	; push value of 'arg' to the stack from ebx
+	mov ebx, [arg]	
+	push ebx
+	; clear ebx
+	mov ebx, 0
+
+	call uhh
+	
+	; restore ebx (because I can.) should be value of 'arg'
+	pop ebx
+
+	; restore stack
+	mov esp, ebp
+	pop ebp
+
+	; exit program, ebx is return value
+	mov eax, 1
+	int 80h
+	ret
-- 
cgit