From 99fcc633ec17f0291d7db174ca60a7632e2df72b Mon Sep 17 00:00:00 2001
From: Joe Hunkeler <jhunkeler@gmail.com>
Date: Thu, 24 Sep 2015 00:18:11 -0400
Subject: Add prog4 -- Inefficient while loop + stack play

---
 Makefile  | 14 +++++++++++++-
 prog4.asm | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 prog4.asm

diff --git a/Makefile b/Makefile
index e79294d..5f91a2b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-all: prog1 prog2
+all: prog1 prog2 prog3 prog4
 
 prog1: prog1.o
 	ld -m elf_i386 -o $@ $<
@@ -12,6 +12,18 @@ prog2: prog2.o
 prog2.o: prog2.asm
 	nasm -f elf -g -o $@ $<
 
+prog3: prog3.o
+	ld -m elf_i386 -o $@ $<
+
+prog3.o: prog3.asm
+	nasm -f elf -g -o $@ $<
+
+prog4: prog4.o
+	ld -m elf_i386 -o $@ $<
+
+prog4.o: prog4.asm
+	nasm -f elf -g -o $@ $<
+
 .PHONY: clean
 clean:
 	rm -rf *.o prog[0-9]
diff --git a/prog4.asm b/prog4.asm
new file mode 100644
index 0000000..0a49cd8
--- /dev/null
+++ b/prog4.asm
@@ -0,0 +1,65 @@
+; begin playing around with variables!
+section .bss
+	fart_count:		resb	4
+
+section .data
+	fart_max:		db		255
+
+section .text
+	global _start
+
+dofarts:
+	push ebp
+	mov ebp, esp
+	add ebp, 4
+
+	; set the fart_count to zero
+	mov DWORD [fart_count], 0
+
+	; save eax to the stack because we're gonna use it
+	push eax
+
+	jmp dofarts.keepgoing
+
+dofarts.stop:
+	;clean up and return
+	pop eax
+	pop ebp
+	ret
+
+dofarts.keepgoing:
+	; put fart_count into a register (i wish i could do mem,mem)
+	mov eax, [fart_count]
+
+	; increment the fart_count
+	add dword[fart_count], 1
+
+	; has fart_count reached fart_max?
+	jge dofarts.check
+	; else, stop... this is redundant...
+	jmp dofarts.stop
+
+dofarts.check:
+	; is fart_count (eax) fart_max?
+	cmp eax, [fart_max]
+	; if so, stop
+	jge dofarts.stop
+	; else keep going
+	jmp dofarts.keepgoing
+
+
+_start:
+	push ebp
+	mov ebp, esp
+
+	call dofarts
+	mov ebx, [fart_count]
+	add ebx, [fart_max]
+	
+	mov esp, ebp
+	pop ebp
+
+	mov eax, 1
+	;mov ebx, 0
+	int 80h
+	ret
-- 
cgit