# Execution begins at address 0
	.pos 0
init:
	irmovl Stack, %esp  	# Set up Stack pointer
	irmovl Stack, %ebp  	# Set up base pointer
	jmp Main		# Execute main program

# Array of 4 elements
	.align 4
array:
	.long 0xd
	.long 0xc0
	.long 0xb00
	.long 0xa000

Main:
	irmovl $4,%eax			# length of array
	pushl %eax				# Push  length of array
	irmovl array,%edx		# put address of array in edx
	pushl %edx      		# Push address of array
	call Sum				# Sum(array, 4)
	halt

# C code for sum subroutine:
#
# int Sum(int *Start, int Count) {
#  int tot=0;
#  while (Count>0) {
#     sum += *Start
#	  Start++;
#     Count--;
#  }
#  return(tot);
# }

Sum:
	pushl %ebp				# stack frame setup
	rrmovl %esp,%ebp		#
	mrmovl 8(%ebp),%ecx 	# ecx = Start
	mrmovl 12(%ebp),%edx	# edx = Count
	irmovl $0, %eax			# tot = 0 (eax)
	andl   %edx,%edx		# 
	je     End				# jump if edx == 0
Loop:
	mrmovl (%ecx),%esi      # get *Start in esi
	addl %esi,%eax          # add to tot
	irmovl $4,%ebx          # 
	addl %ebx,%ecx          # Start++
	irmovl $-1,%ebx	        # 
	addl %ebx,%edx          # Count--
	jne    Loop             # Stop when edx is 0
End:	
	popl %ebp				# restore stack frame
	ret		

	.pos 0x100
Stack:	# The stack goes here