Hi, I'm trying to write an assembly programming which multiplies the values stored in two registers, and converts the result to ASCII. I need to know what exactly what it is that I'm doing wrong, as I keep getting segmentation faults and/or floating point exceptions. The comments in the code should explain in detail how I'm trying to accomplish this, but I find that most of my issues keep happening when I try do div edx by eax :/

Any thoughts? I think I have to actually *initialize* the registers, though I don't quite know how to do that. Thanks.

Code

section .data
	counter: db 0xA							;store value 10 in 'counter', while allocating only one byte. This will be used for decrementing purposes
section .bss
	valueToPrint: resb 4					;alloc 4 bytes of data in 'valueToPrint'

section .text

global _start

_print_char: 					
	add eax, '0' 				;convert to ascii
	mov [valueToPrint], eax		;store contents of 'eax' in valueToPrint
	mov eax, 4					;syswrite
	mov ebx, 1					;stdout
	mov ecx, valueToPrint		;machine will take whatever value exists in 'ecx' and print
	mov edx, 1					;print only a single byte's worth of data
	int 0x80					;invoke kernel to perfrom instruction
	ret							

_convert_values:
	mov edx, 0xA				;dividing eax by 10, which will lower its tens place
	div edx						;do division: remainder SHOULD be stored in edx
	mov byte [edx], 0x0			;zero out edx		
	call _print_char			;do printing for latest character
	dec byte [counter]			;decrement counter
	mov dword [eax], counter	;store counter in eax
	jnz _convert_values			;while eax > 0 continue process

_endl:
	mov eax, '\n'				;store newline character in eax to be printed
	call _print_char			;print value
	ret					

_mul:
	mov eax, 0x2A ;store 42 in eax
	mov edx, 0x2B ;store 43 in edx
	mul edx		  ;multiply [eax] * [edx]
	ret

_safe_exit:
	mov eax, 1 	;initiate 'exit' syscall
	mov ebx, 0 	;exit with error code 0
	int 0x80	;invoke kernel to do its bidding 

_start:
	nop								;used to keep gdb from complaining

	call _mul						;multiply the values
	call _convert_values			;do hex to ascii conversion
	
	jmp _safe_exit					;use jmp as opposed to call since it technically doesn't 'ret'