rsum.ys

深入理解计算机系统 的lab

	.pos 0
init:	irmovl Stack, %esp
	irmovl Stack, %ebp
	jmp Main

# Sample linked list
.align 4
ele1:
         .long 0x00a
         .long ele2
ele2:
         .long 0x0b0
         .long ele3
ele3:
         .long 0xc00
         .long 0
Main:
	irmovl ele1, %edx
	pushl %edx
	call rsum_list
	halt

rsum_list:
	pushl %ebp
	rrmovl %esp, %ebp
	pushl %ecx
	mrmovl 8(%ebp), %ecx	#get* ls
	xorl %eax, %eax		#val==0
	andl %ecx, %ecx		#?ls==0
	je L39
	
	irmovl $4, %edx
	rrmovl %ecx, %esi	
	addl %edx, %esi
	mrmovl (%esi), %esi
	pushl %esi
	call rsum_list
	popl %esi
	mrmovl (%ecx), %edx
	addl %edx, %eax
L39:	
	
	popl %ecx
	rrmovl %ebp, %esp
	popl %ebp
	ret

	.pos 0x100
Stack: