Lab5-x86-Ver3.txt

/* 
   This is a 'hello world' program in x86_64 assembler using the 
   GNU assembler (gas) syntax. Note that this program runs in 64-bit
   mode.

   CTyler, Seneca College, 2014-01-20
   Licensed under GNU GPL v2+
*/

/*--Modified by: James Daniel Semilla--*/
/*--Student ID: 105718175--*/
/*--Date: March 4, 2020--*/

/*--Print char reference: https://stackoverflow.com/questions/8201613/printing-a-character-to-standard-output-in-assembly-x86  --*/


.text
.globl	_start

min = 0
max = 31
zeroCheck = 48

/*---Register Info---*/

/*-r8: Left digit ASCII-*/
/*-r9: Right digit ASCII-*/


_start:
	mov	$min, %r15
	mov 	$10,  %r10

	movq	$msg, %r12
	add	$8, %r12

loop:	
	/*--Character Processing--*/
	mov %r15, %rax
	mov $0, %rdx
	div %r10


	/*--Get the left digit--*/
	mov %rax, %r8
	add $48, %r8

	/*--Check if the left digit is not a zero--*/
	cmp $zeroCheck, %r8
	jne onLeftDigitNotZero
	
	/*--False: turn the left digit into a space--*/
	mov $32, %r8

	/*--True--*/
onLeftDigitNotZero:


	/*--Get the right digit--*/
	mov %rdx, %r9
	add $48, %r9
	



	inc	%r15

	
	/*--Print the text "Loop:"--*/
	
	movq	$len,%rdx			/* message length */
	movq 	$msg,%rsi			/* message location */
	

	movq	$1,%rdi				/* file descriptor stdout */
	movq	$1,%rax				/* syscall sys_write */
	syscall

	/*--Print a space--*/
	push	$32				/*--Print space character--*/
	mov	%rsp, %rsi
	movq	$1,%rdi				/* file descriptor stdout */
	movq	$1,%rax				/* syscall sys_write */
	syscall


	/*--Print the first digit--*/
	push	%r8				/*--Print first digit character--*/
	mov	%rsp, %rsi
	movq	$1,%rdi				/* file descriptor stdout */
	movq	$1,%rax				/* syscall sys_write */
	syscall



	/*--Print the second digit--*/
	push	%r9				/*--Print second digit character--*/
	mov	%rsp, %rsi
	movq	$1,%rdi				/* file descriptor stdout */
	movq	$1,%rax				/* syscall sys_write */
	syscall

	
	/*--Print the new line--*/
	push	$10				/*--Print new line character--*/
	mov	%rsp, %rsi
	movq	$1,%rdi				/* file descriptor stdout */
	movq	$1,%rax				/* syscall sys_write */
	syscall



	cmp $max, %r15
	jne loop

	movq	$0,%rdi				/* exit status */
	movq	$60,%rax			/* syscall sys_exit */
	syscall

.section .rodata

msg:	.ascii      "Loop:"
	len = . - msg

numMsg:	.ascii	" "