linux平台学x86汇编（十二）：字符串的存储与加载

# stos.s

.section .data
space:
    .ascii " "
.section .bss
    .lcomm buffer, 256
.section .text
.globl _start
_start:
    nop
    leal space, %esi
    leal buffer, %edi
    movl $256, %ecx

    cld
    lodsb
    rep stosb

    movl $1, %eax
    movl $0, %ebx
    int $0x80

Breakpoint 1, _start () at stos.s:11
11    nop
(gdb) print/x $eax
$1 = 0x0
(gdb) x/16b &buffer
0x80490a0 <buffer>: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x80490a8 <buffer+8>: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
(gdb) s
12    leal space, %esi
(gdb) s
13    leal buffer, %edi
(gdb) s
14    movl $256, %ecx
(gdb) s
16    cld
(gdb) s
17    lodsb
(gdb) s
18    rep stosb
(gdb) print/x $eax
$4 = 0x20
(gdb) s
20    movl $1, %eax
(gdb) s
21    movl $0, %ebx
(gdb) x/16b &buffer
0x80490a0 <buffer>: 0x20 0x20 0x20 0x20 0x20 0x20 0x20 0x20
0x80490a8 <buffer+8>: 0x20 0x20 0x20 0x20 0x20 0x20 0x20 0x20
(gdb)

linux平台学x86汇编（十二）：字符串的存储与加载

原文：http://blog.csdn.net/shallnet/article/details/45602245