asumr.ys

# 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
	pushl  %eax             # Push 4
	irmovl array, %edx
	pushl  %edx             # Push array
	call   rSum	            # Sum(array, 4)
	halt

	# int Sum(int *Start, int Count)
rSum:
	pushl  %ebp
	rrmovl %esp, %ebp
	pushl  %ebx             # Save value of %ebx
	mrmovl 8(%ebp), %ebx    # Get Start
	mrmovl 12(%ebp), %eax   # Get Count
	andl   %eax, %eax       # Test value of Count
	jle    L38              # If <= 0, goto zreturn
	irmovl $-1, %edx
	addl   %edx, %eax       # Count--
	pushl  %eax             # Push Count
	irmovl $4, %edx
	rrmovl %ebx, %eax
	addl   %edx, %eax
	pushl  %eax             # Push Start+1
	call   rSum             # Sum(Start+1, Count-1)
	mrmovl (%ebx), %edx
	addl   %edx, %eax       # Add *Start
	jmp    L39              # goto done
L38:
	xorl %eax,%eax          # zreturn:
L39:
	mrmovl -4(%ebp), %ebx   # done: Restore %ebx
	rrmovl %ebp, %esp       # Deallocate stack frame
	popl   %ebp             # Restore %ebp
	ret

	.pos 0x400
Stack:	                    # The stack goes here