作者:20191322wyl
目录int g(int x){ return x+3; } int f(int x){ int i = 22; return g(x)+i; } int main(void){ return f(8)+1; }
sudo apt-get install libc6-dev-i386
gcc -g week20191322.c -o example -m32
在64位的机器上产生32位汇编,然后使用gdb example
指令进入gdb调试器
b main
,在r
一下,使用disassemble
获取汇编代码,用i(info) r(registers)
指令查看各寄存器的值:
使用命令display /i $pc
设置每次都显示当前执行的命令
push
mov
sub
call
add
movl
push
call
add
mov
add
leave
ret
20191322wyl | eax | ebp | esp | eip | 栈 |
---|---|---|---|---|---|
push | 0x56559000 | 0xffffd138 | 0xffffd130 | 0x5655619e | 0x565561db |
move | 0x56559000 | 0xffffd138 | 0xffffd12c | 0x5655619f | 0xfffd138 |
sub | 0x56559000 | 0xffffd12c | 0xffffd12c | 0x565561a1 | 0xffffd138 |
call | 0x56559000 | 0xffffd12c | 0xffffd11c | 0x565561a4 | 0x5655620d |
add | 0x565561a9 | 0xffffd12c | 0xffffd11c | 0x565561a9 | 0x5655620d |
movl | 0x56559000 | 0xffffd12c | 0xffffd11c | 0x565561ae | 0x5655620d |
push | 0x56559000 | 0xffffd12c | 0xffffd11c | 0x565561b5 | 0x5655620d |
call | 0x56559000 | 0xffffd12c | 0xffffd118 | 0x565561b8 | 0x8 |
add | 0xb | 0xffffd12c | 0xffffd118 | 0x565561bd | 0x8 |
mov | 0xb | 0xffffd12c | 0xffffd11c | 0x565561c0 | 0x5655620d |
add | 0xb | 0xffffd12c | 0xffffd11c | 0x565561c3 | 0x0 |
leave | 0x21 | 0xffffd12c | 0xffffd11c | 0x565561c5 | 0x5655620d |
ret | 0x21 | 0xffffd138 | 0xffffd130 | 0x565561c6 | 0x565561db |