Debug RTEMS RTL using qemu-system-arm

[Mihaela Panescu]

Hi,

Can you try with the following configuration:
#define CONFIGURE_MAXIMUM_POSIX_KEYS             16
#define CONFIGURE_MAXIMUM_POSIX_KEY_VALUE_PAIRS  16

Mihaela





On Sun, Jul 6, 2014 at 4:21 PM, Peng Fan <van.freenix at gmail.com> wrote:

> I use qemu and gdb to debug,  The following is the backtrace. and I found
> that _POSIX_Keys_Allocate() returns NULL/0, is this correct? Any tips? I do
> not know how to debug this, or there should be some shell configuration
> when call rtems_shell_init?
>
> Breakpoint 1, pthread_key_create (key=0x20b2c8,
>     destructor=0x157d55 <rtems_shell_env_free>)
>     at
> ../../../../../../rtems-new/c/src/../../cpukit/posix/src/keycreate.c:41
> 41  the_key = _POSIX_Keys_Allocate();
> (gdb) bt
> #0  *pthread_key_create* (key=0x20b2c8,
>     destructor=0x157d55 <rtems_shell_env_free>)
>     at
> ../../../../../../rtems-new/c/src/../../cpukit/posix/src/keycreate.c:41
> #1  0x00157db8 in *rtems_shell_current_env_make_key *()
>     at
> ../../../../../../rtems-new/c/src/../../cpukit/libmisc/shell/shell.c:109
> #2  0x0013f2fa in _Once (once_state=0x2071d8
> <rtems_shell_current_env_once+4>,
>     init_routine=0x157da1 <rtems_shell_current_env_make_key>)
>     at ../../../../../../rtems-new/c/src/../../cpukit/score/src/once.c:42
> #3  0x00136aca in pthread_once (
>     once_control=0x2071d4 <rtems_shell_current_env_once>,
>     init_routine=0x157da1 <rtems_shell_current_env_make_key>)
>     at
> ../../../../../../rtems-new/c/src/../../cpukit/posix/src/pthreadonce.c:39
> #4  0x00158f96 in rtems_shell_main_loop (shell_env_arg=0x5a4118)
>     at
> ../../../../../../rtems-new/c/src/../../cpukit/libmisc/shell/shell.c:707
> #5  0x00158f2e in rtems_shell_task (task_argument=5914904)
>     at
> ../../../../../../rtems-new/c/src/../../cpukit/libmisc/shell/shell.c:671
> #6  0x0014207c in _Thread_Handler ()
>     at
> ../../../../../../rtems-new/c/src/../../cpukit/score/src/threadhandler.c:192
> Backtrace stopped: previous frame identical to this frame (corrupt stack?)
> *(gdb) n*
> *43  if ( !the_key ) {*
> *(gdb) p the_key*
> *$1 = (POSIX_Keys_Control *) 0x0*
>
> Regards,
> Peng.
>
> 2014-07-05 15:44 GMT+08:00 Peng Fan <van.freenix at gmail.com>:
>
> Hi,
>>
>> I encountered a problem when using qemu-system-arm to simulate RTEMS RTL
>> using `qemu-system-arm -no-reboot -net none -nographic -M realview-pbx-a9
>> -m 256M -kernel build/arm-rtems4.11-realview_pbx_a9_qemu/rtld`
>>
>> it continuly outputs the following msg, but not run into a shell prompt:
>> "
>> pthread_setspecific(shell_current_env_key)
>> Starting shell....
>>
>> pthread_setspecific(shell_current_env_key)
>> Starting shell....
>>
>> pthread_setspecific(shell_current_env_key)
>> Starting shell....
>>
>> pthread_setspecific(shell_current_env_key)
>> Starting shell....
>> "
>> I found that  `sc = rtems_shell_init ("fstst", 60 * 1024, 150,
>> "/dev/console", 0, 1, NULL);`  returns immediately with the return value
>> RTEMS_SUCCESSFULL.
>>
>> If I `git reset --hard *ffc862cbf567*` to the following RTEMS commit,
>> "commit *ffc862cbf567*068d1cc2b8417bafdf808dfcc67a
>> Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
>> Date:   Tue Sep 17 13:08:49 2013 +0200
>>
>>     bsp/realview-pbx-a9: Add NULL pointer protection
>>
>>     Qemu Git version 8641136c54d216edb5bb8ef723c754039b4ce5cf3 or later is
>>     required."
>> RTL runs well. I am not familiar with RTEMS internal, not sure why this.
>> The qemu verison is 2.0.0. RTEMS is 4.11.
>>
>> Regards,
>> Peng.
>>
>
>
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