gdb 遠程qemu-arm調試
把 c 編譯成 arm 指令的可運行文件
/usr/bin/arm-linux-gnueabi-g++ hello.cpp cat hello.cpp
#include <stdio.h>
void crash()
{
char* a = 0;
*a = 0;
}
int main()
{
printf("hello world\n");
crash();
printf("after crash\n");
return 0;
}
直接執行報錯。由於 host 是 linux x86
$ ./a.out
-bash: ./a.out: cannot execute binary file
要用 qemu-arm 來執行, 結果是期望的
qemu-arm -L /usr/arm-linux-gnueabi/ a.out
hello world
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault (core dumped)
進行遠程調試(關鍵是添加 -g 參數,指定port為1235)
qemu-arm -g 1235 -L /usr/arm-linux-gnueabi/ a.out
運行用 linux-x86 的 gdb 並不能打印 symbol
(gdb) target remote :1235
Remote debugging using :1235
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? ()
(gdb) bt
#0 0x00000000 in ?? ()
Cannot access memory at address 0x0
(gdb) file /home/payne/hello/a.out
A program is being debugged already.
Are you sure you want to change the file? (y or n) y
Reading symbols from /home/payne/hello/a.out...(no debugging symbols found)...done.
(gdb) bt
#0 0x00000000 in ?? ()
Cannot access memory at address 0x0
(gdb)
懷疑要使用 arm 的 gdb 參見 http://mazhijing.blog.51cto.com/215535/40759。 編譯了 arm 的gdb, 運行後定位到 crash()
qemu-arm -L /usr/arm-linux-gnueabi/ ./gdb
(gdb) target remote :1235
Remote debugging using :1235
warning: Can not parse XML target description; XML support was disabled at compile time
0x40801c40 in ?? ()
(gdb) file /home/payne/hello/a.out
A program is being debugged already.
Are you sure you want to change the file?
(y or n) y
Reading symbols from /home/payne/hello/a.out...(no debugging symbols found)...done.
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x0000841e in crash() ()
(gdb)
結論:
難道說 arm 的 gdbserver, 就僅僅能用 arm 的 gdb?