/* x86 Assembly (AT&T style) version of a Prime Number Finder
   haplo@mindstab.net */

.data
numstr: .asciz "%d\n"
max = 100000
scanformat : .asciz "%d"

int = 0

.text
.extern printf
.extern scanf
.extern exit

.global main

	printnum:
		pushl %ebx
        	pushl $numstr
        	call printf
		pop %eax
		pop %ecx
		ret
		
main:

	# scanf code from http://www.linuxgazette.com/issue71/joshi.html 
	
	pushl %ebp             # save EBP on stack 
	movl %esp,%ebp         # EBP = ESP 
	subl $4,%esp           # create space for x on the stack 
	leal -4(%ebp),%eax
	pushl %eax       
	pushl $scanformat
	call scanf
	addl $12, %esp

	movl -4(%ebp),%eax
	movl %eax, -12(%ebp)

	# END scanf code 


	# The rest is all my code 

	pushl %eax
	
	movl $3, %ebx
	movl $2, %ecx
	movl $4, %edx

	toploop:

	popl %eax
	cmp %eax, %ebx
	jg end
	pushl %eax	

	pushl %edx
	pushl %ecx
	pushl %ebx
	movl $3, %ecx
	
	checkloop:
	
	popl %ebx
	popl %edx
	cmp %edx, %ecx
	pushl %edx
	pushl %ebx
	jge showprime	

	movl $0, %edx	
	movl %ebx, %eax
	divl %ecx

	addl $2, %ecx

	cmp $0, %edx
	je doneloop

	jmp checkloop

	showprime:
	call printnum
	
	doneloop:

	popl %ebx
	popl %ecx
	popl %edx
	
	addl $2, %ebx

	cmp %edx, %ebx
	jl toploop
	
	addl $1, %ecx
	movl %ecx, %eax
	mull %eax
	movl %eax, %edx

	jmp toploop

	end:
		pushl $0
		call exit