gdb 远程qemu-arm调试

把 c 编译成 arm 指令的可执行文件

/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");
}

直接运行报错，因为 host 是 linux x86

$ ./a.out

-bash: ./a.out: cannot execute binary file

需要用 qemu-arm 来运行， 结果是期望的

qemu-arm -L /usr/arm-linux-gnueabi/ a.out

hello world

qemu: uncaught target signal 11 (Segmentation fault) - core dumped

Segmentation fault (core dumped)

进行远程调试（关键是增加 -g 参数，指定端口为1235)

qemu-arm -g 1235 -L /usr/arm-linux-gnueabi/ a.out

执行用 linux-x86 的 gdb 并不能打印 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)

怀疑要使用 arm 的 gdb

参见 http://mazhijing.blog.51cto.com/215535/40759， 编译了 arm 的gdb, 执行后定位到 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)

结论：

难道说 arm 的 gdbserver, 就只能用 arm 的 gdb？