程序代码：

(gdb) disass main
Dump of assembler code for function main:
   0x08048433 <+0>:    push   %ebp                   
   0x08048434 <+1>:    mov    %esp,%ebp                    ;create stack frame equal to instruction "enter"
   0x08048436 <+3>:    and    $0xfffffff0,%esp             ;esp align to 0x10
   0x08048439 <+6>:    sub    $0x10,%esp                   ;stack allocate memory size = 0x10 for function parameters
   0x0804843c <+9>:    movl   $0x4,0xc(%esp)               ;stack transfer parameters
   0x08048444 <+17>:   movl   $0x3,0x8(%esp)          
   0x0804844c <+25>:   movl   $0x2,0x4(%esp)
   0x08048454 <+33>:   movl   $0x1,(%esp)
   0x0804845b <+40>:   call   0x8048404 <test_function>    ;test_function(1, 2, 3, 4);
   0x08048460 <+45>:   leave                               ;(>386 instuction pair instruction to "enter") equal to mov esp,ebp pop ebp
   0x08048461 <+46>:   ret                                 ;return;
End of assembler dump.


(gdb) disass test_function
Dump of assembler code for function test_function:
   0x08048404 <+0>:    push   %ebp
   0x08048405 <+1>:    mov    %esp,%ebp
   0x08048407 <+3>:    sub    $0x28,%esp
   0x0804840a <+6>:    mov    %gs:0x14,%eax
   0x08048410 <+12>:   mov    %eax,-0xc(%ebp)
   0x08048413 <+15>:   xor    %eax,%eax
   0x08048415 <+17>:   movl   $0x6,-0x1c(%ebp)             ;flag = 6;
   0x0804841c <+24>:   movb   $0x41,-0x16(%ebp)            ;buffer[0] = 'A';
   0x08048420 <+28>:   mov    -0xc(%ebp),%eax
   0x08048423 <+31>:   xor    %gs:0x14,%eax
   0x0804842a <+38>:   je     0x8048431 <test_function+45>
   0x0804842c <+40>:   call   0x8048340 <__stack_chk_fail@plt>
   0x08048431 <+45>:   leave 
   0x08048432 <+46>:   ret   
End of assembler dump.
(gdb)