把 c 编译成 arm 指令的可运行文件

/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");

 }

直接执行报错。由于 host 是 linux x86

$ ./a.out 

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

须要用 qemu-arm 来执行， 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（关键是添加 -g 參数，指定port为1235)

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

运行用 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

參见 http://mazhijing.blog.51cto.com/215535/40759。 编译了 arm 的gdb, 运行后定位到 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, 就仅仅能用 arm 的 gdb？