rsum.ys

# Execution begins at address 0
.pos 0
irmovq stack, %rsp
# Set up stack pointer
	call main
# Execute main program
	halt
# Terminate program
# Sample linked list
	.align 8
  ele1:
	.quad 0x00a
	.quad ele2
  ele2:
	.quad 0x0b0
	.quad ele3
  ele3:
	.quad 0xc00
	.quad 0
main:
	irmovq ele1,%rdi
        xorq %rax,%rax
	call rsumlist
	ret
# sum_list - Recursive version of sum_list
# start in %rdi
rsumlist:
        pushq   %rcx
        andq    %rdi , %rdi
        je  end
        mrmovq  (%rdi) , %rcx
        irmovq  $8 , %rbx
        addq    %rbx , %rdi
        mrmovq  (%rdi),  %rdi
        call    rsumlist
        addq    %rcx , %rax 
end:
        popq    %rcx
        ret
# Stack starts here and grows to lower addresses
.pos 0x200
stack: