gdb 调试汇编-Toy模板网

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starti

从第一条指令开始执行并停止.

nexti

执行完当前指令; 当前指令可能是call一个函数, 但是仍然下一条指令才停止;

stepi

下一条指令, 如果跳转也跟着跳转;

查看寄存器值

info registers 查看通用寄存器
info registers {register_name ...}指定寄存器的值
info registers all所有寄存器, 不仅仅通用寄存器; 还有向量寄存器等;

修改寄存器

p $rip = val文章来源地址https://www.toymoban.com/news/detail-645756.html

查看汇编

disassemble $rip
disassemble main
# 推荐
x /1024ig $rip

案例

代码

int main() {
    int a = 0;
    a ++ ;
    return a;
}

编译

gcc test.cpp -o a.out

案例

ch@ch-ubuntu:~/ch/cppfile/test$ gdb ./a.out -q
Reading symbols from ./a.out...
(No debugging symbols found in ./a.out)
(gdb) starti
Starting program: /home/ch/ch/cppfile/test/a.out 

Program stopped.
0x00007ffff7fe4880 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb) b main
Breakpoint 1 at 0x555555555131
(gdb) c
Continuing.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Breakpoint 1, 0x0000555555555131 in main ()
(gdb) disassemble $rip
Dump of assembler code for function main:
   0x0000555555555129 <+0>:	endbr64 
   0x000055555555512d <+4>:	push   %rbp
   0x000055555555512e <+5>:	mov    %rsp,%rbp
=> 0x0000555555555131 <+8>:	movl   $0x0,-0x4(%rbp)
   0x0000555555555138 <+15>:	addl   $0x1,-0x4(%rbp)
   0x000055555555513c <+19>:	mov    -0x4(%rbp),%eax
   0x000055555555513f <+22>:	pop    %rbp
   0x0000555555555140 <+23>:	ret    
End of assembler dump.
(gdb) nexti
0x0000555555555138 in main ()
(gdb) disassemble $rip
Dump of assembler code for function main:
   0x0000555555555129 <+0>:	endbr64 
   0x000055555555512d <+4>:	push   %rbp
   0x000055555555512e <+5>:	mov    %rsp,%rbp
   0x0000555555555131 <+8>:	movl   $0x0,-0x4(%rbp)
=> 0x0000555555555138 <+15>:	addl   $0x1,-0x4(%rbp)
   0x000055555555513c <+19>:	mov    -0x4(%rbp),%eax
   0x000055555555513f <+22>:	pop    %rbp
   0x0000555555555140 <+23>:	ret    
End of assembler dump.
(gdb) x /5ig $rip
=> 0x555555555138 <main+15>:	addl   $0x1,-0x4(%rbp)
   0x55555555513c <main+19>:	mov    -0x4(%rbp),%eax
   0x55555555513f <main+22>:	pop    %rbp
   0x555555555140 <main+23>:	ret    
   0x555555555141:	add    %al,(%rax)
(gdb) ni
0x000055555555513c in main ()
(gdb) ni
0x000055555555513f in main ()
(gdb) p $eax
$1 = 1
(gdb)