This is the mail archive of the mailing list for the GDB project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: GDB Remote debug: Why several "$Z0,address,length" msg when only set one breakpoint?

On 08/28/2014 05:58 AM, Pedro Alves wrote:
> On 08/27/2014 01:11 PM, Yao Qi wrote:
>> GDB is interested in entry address, but I don't know why GDB insert
>> breakpoint there.  In GDB, command 'maintenance info breakpoints' can
>> list all the user breakpoints and internal breakpoints.  If it still
>> doesn't help, you can debug your gdb, set breakpoint
>> remote_insert_breakpoint, and check why the breakpoint is inserted at
>> 0x87800000.
Breakpoint 1, do_bootz (cmdtp=0x8784cbc4 <_u_boot_list_2_cmd_2_bootz>, flag=0, 
    argc=1, argv=0xbf552a20) at common/cmd_bootm.c:1928
1928	{
(gdb) maintenance info breakpoints
Num     Type           Disp Enb Address    What
-1      shlib events   keep y   0x87800000 <_start> inf 1
1       breakpoint     keep y   0x87809580 in do_bootz 
                                           at common/cmd_bootm.c:1928 inf 1
	breakpoint already hit 2 times
> I'd guess this is a build of GDB targeting Linux, and then that
> breakpoint is the solib-event breakpoint.  One of the
> last-resort addresses solib-svr4.c tries is _start:
> static const char * const bkpt_names[] =
> {
>   "_start",
> ...
$arm-poky-linux-gnueabi-nm u-boot |grep start
87899130 B NetRestartWrap
87899094 b NetRestarted
8784d35c B __bss_start
87800000 T __image_copy_start
8784d35c D __rel_dyn_start
87800000 T _start

Yeah. I just objdump the elf file, but not `nm`.  symbol __image_copy_start and __start both point to 0x87800000.

Thanks all.

> Thanks,
> Pedro Alves

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]