Assembly assignment

#This program is meant to ask a base  (then print it to check
#if it's interpreted correctly) and an exponent (then print that
#too), then do the calculation and print out the result. I don't know
#why it doesn't work, so please help me. This is  what
#the code would look like in Java: http://i.imgur.com/njBXecr.png

.text
string:	.asciz "Jelster\nAssignment 2: power\n"
enterbase:	.asciz "Enter your non-negative base: "
enterexp:	.asciz "Enter your non-negative exponent: "
base:	.asciz "%ld"
exp:	.asciz "%ld"
result:	.asciz "Result is: %ld"

.global main			#main routine

main:
	pushq	%rbp		#initialize base pointer
	movq	%rsp, %rbp
	subq	$16, %rsp
	call	writestring	#goes to the start of writestring
	call	getbase		#goes to the start of getbase
	movq	%rax, -8(%rbp)
	call	getexp		#goes to the start of getexp
	movq	%rax, -16(%rbp)
	movq	-8(%rbp), %rdi
	movq	-16(%rbp), %rsi
	call	pow			#goes to start of pow

	movq	%rax, %rsi	#load first argument of printf
	movq	$result, %rdi
	movq	$0, %rax	#no vector arguments
	call	printf		#prints result

	movq	%rbp, %rsp	#sets base pointer to its original position
	pop	%rbp

	call	end		#goes to start of end

writestring:
	movq	$string, %rdi	#writes string to register
	movq	$0, %rax	#no vector arguments
	call	printf		#prints string
	ret

getbase:
	pushq	%rbp		#initialize base pointer
	movq	%rsp, %rbp

	movq	$enterbase, %rdi#writes enterbase to register
	movq	$0, %rax	#no vector arguments
	call	printf		#prints enterbase

	subq	$8, %rsp	#reserve stack space for base variable
	leaq	-8(%rbp), %rsi	#load address of stack var in rsi
	movq	$base, %rdi	#load first argument of scanf
	movq	$0, %rax	#no vector registers for scanf
	call	scanf

	movq	$base, %rdi	#load first argument of printf
	movq	-8(%rbp), %rsi	#load second argument of printf: number
							#in address -8 to rsi
	movq	$0, %rax	#no vector arguments
	call	printf		#prints base

	movq	%rbp, %rsp	#sets base pointer to its original position
	pop	%rbp
	ret

getexp:
	pushq	%rbp		#initialize base pointer
	movq	%rsp, %rbp

	movq	$enterexp, %rdi	#writes enterexp to register
	movq	$0, %rax	#no vector arguments
	call	printf		#prints enterexp

	subq	$8, %rsp	#reserve stack space for exp variable
	leaq	-8(%rbp), %rsi	#load address of stack var in rsi
	movq	$exp, %rdi	#load first argument of scanf
	movq	$0, %rax	#no vector registers for scanf
	call	scanf

	movq	$exp, %rdi	#load first argument of printf
	movq	-8(%rbp), %rsi	#load second argument of printf: number
							#in address -16 to rsi
	movq	$0, %rax	#no vector arguments
	call	printf		#prints base

	movq	%rsi, %rax

	movq	%rbp, %rsp	#sets base pointer to its original position
	pop		%rbp
	ret

pow:
	pushq	%rbp		#initialize base pointer
	movq	%rsp, %rbp

	movq	$1, %rax	#sets rax to 1 (this is int res)
	movq	$0, %rcx	#sets rcx to 0 (this is int i)

	jmp		loop

loop:
	cmpq	%rsi, %rcx	#if rcx (i) => rsi (exp) jump to endloop
	jge		endloop

	imulq	%rdi		#multiplies rax (res) with rdi (base)
	incq	%rcx		#increments rcx by 1

	jmp		loop		#repeat the loop

endloop:
	movq	%rbp, %rsp	#sets base pointer to its original position
	pop		%rbp
	ret

end:
	movq	$0, %rdi	#program ran succesfully
	call	exit		#exits program