递归函数调用

sem.s

 

.section .data

.section .text
.globl _start
_start:
 pushl $5
 call power
 add $4, %esp
 movl %eax, %ebx
 movl $1, %eax
 int $0x80
 
.type power, @function
power:
 pushl %ebp
 movl %esp, %ebp
 
 movl 8(%ebp), %eax
 
 cmpl $1, %eax
 je power_end
 decl %eax
 pushl %eax
 call power
 movl 8(%ebp), %ebx
 imull %ebx, %eax
 
power_end:
 movl %ebp, %esp
 popl %ebp
 ret
 

 

as -o sem.o sem.s

ld -o sem sem.o

echo $?