dastest.s

来自「*****汇编语言程序设计 源代码*****」· S 代码 · 共 26 行

# dastest.s - An example of using the DAS instruction
.section .data
value1:
   .byte 0x25, 0x81, 0x02
value2:
   .byte 0x33, 0x29, 0x05
.section .bss
   .lcomm result, 4
.section .text
.globl _start
_start:
   nop
   xor %edi, %edi
   movl $3, %ecx
loop1:
   movb value2(, %edi, 1), %al
   sbbb value1(, %edi, 1), %al
   das
   movb %al, result(, %edi, 1)
   inc %edi
   loop loop1
   sbbb $0, result(, %edi, 4)
   movl $1, %eax
   movl $0, %ebx
   int $0x80