sum.ys

来自「深入理解计算机系统 的lab」· YS 代码 · 共 45 行

	.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 $4, %eax
	pushl %eax
	irmovl ele1, %edx
	pushl %edx
	call sum_list
	halt

sum_list:	
	pushl %ebp
	rrmovl %esp, %ebp
	mrmovl 8(%ebp), %ecx	#ecx=ls
	xorl %eax, %eax		#val=0
Loop:	
	andl %ecx, %ecx
	je End
	mrmovl (%ecx), %esi	#get* ls
	addl %esi, %eax		#add to val
#	irmovl $4, %ebx		
#	addl %ebx, %ecx		#ls--
	mrmovl 4(%ecx), %ecx	#ls=ls->next
	jmp Loop
End:
	popl %ebp
	ret
	.pos 0x100
Stack: