汇编报错：Warning: Cannot insert breakpoint 1. Cannot access memory at address 0x1135 解决办法（先不打断点run一遍）(代码

Posted 2021-06-23 Dontla

在linux下用gdb打断点调试发现报错了：

(gdb) run
Starting program: /home/dontla/桌面/test/test 
Warning:
Cannot insert breakpoint 1.
Cannot access memory at address 0x1135

解决办法：

先退出GDB

(gdb) quit
A debugging session is active.

	Inferior 1 [process 32756] will be killed.

Quit anyway? (y or n) 
dontla@dontla-virtual-machine:~/桌面/test$ c

然后用gdb打开程序先run一遍再打断点调试：

dontla@dontla-virtual-machine:~/桌面/test$ gdb ./test
GNU gdb (Ubuntu 9.2-0ubuntu1~20.04) 9.2
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
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Reading symbols from ./test...
(No debugging symbols found in ./test)
(gdb) run
Starting program: /home/dontla/桌面/test/test 
[Inferior 1 (process 32770) exited with code 03]
(gdb) disas main
Dump of assembler code for function main:
   0x0000555555555130 <+0>:	mov    $0x1,%eax
   0x0000555555555135 <+5>:	mov    $0x2,%ebx
   0x000055555555513a <+10>:	add    %ebx,%eax
   0x000055555555513c <+12>:	retq   
   0x000055555555513d <+13>:	nopl   (%rax)
End of assembler dump.
(gdb) break *0x0000555555555135
Breakpoint 1 at 0x555555555135
(gdb) run
Starting program: /home/dontla/桌面/test/test 

Breakpoint 1, 0x0000555555555135 in main ()
(gdb) 

这是因为：

原因在于数据断点的设置有误。在没有用gdb运行（run）过可执行程序之前，使用disasemble指令反汇编出来的汇编语言的左边的地址偏移地址，不是逻辑地址。所以，即使break指令能够设置断点，当GDB运行时也不可能访问到这个地址。也就会出现上面的错误。
数据断点：给某个内存地址设置断点，改变该地址所装内容时会触发断点，运行到该地址时会触发断点。（从网上看的，参考）
而学过操作系统或者微机原理就该知道，程序给出来的只是逻辑地址，不可能直接给物理地址的，物理地址都是由系统将其映射成了逻辑地址。

参考文章：GDB数据数据断（内存断点）报错：Warning: Cannot insert breakpoint