RE: [ECOS] how work synthetic for exceptions

[trollepi jj <jackoaway@hotmail.com>]

Hi,
the SWI mecanism work well. (with a RAM config, the path and other modifications)
I just want to experiment the same thing on the synthetic target for the advantages that you know. (In this case replace the SWI by signal mecanism)
Best regards.
jjp
----------------------------------------
> Date: Thu, 3 Apr 2008 06:25:55 -0600
> From: gary@mlbassoc.com
> To: jackoaway@hotmail.com
> CC: ecos-discuss@ecos.sourceware.org
> Subject: Re: [ECOS] how work synthetic for exceptions
> 
> trollepi jj wrote:
>> Hi,
>> I try do modify the execution of a thread for the synthetic target.
>> I've done that for an at91 board (using SWI,exception hanler and HAL_SavedRegisters to store the context info).
>> I put an exception handler for the CYG_HAL_SYS_SIGILL to see if i get the info pointers of the handler (3rd parameter of the function).
>> I reach the exception handler and have this backtrace call from gdb
>> 
>> 
>> #0  simple_syscall_handler (data=2, number=0, info=0) at main.c:56
>> #1  0x01004c7c in Cyg_Exception_Control::deliver_exception (this=0x2004560, exception_number=0, 
>>     exception_info=0) at /home/pitrolle/ecos/ecos/packages/kernel/current/src/common/except.cxx:235
>> #2  0x010042bf in Cyg_Thread::deliver_exception (this=0x20004c0, exception_number=0, exception_info=0)
>>     at /home/pitrolle/ecos/ecos/packages/kernel/current/src/common/thread.cxx:1013
>> #3  0x01004ce0 in cyg_hal_deliver_exception (code=0, data=0)
>>     at /home/pitrolle/ecos/ecos/packages/kernel/current/src/common/except.cxx:248
>> #4  0x0100160d in synth_exception_sighandler (sig=4)
>>     at /home/pitrolle/ecos/ecos/packages/hal/synth/arch/current/src/synth_intr.c:460
>> #5  0x01002e18 in cyg_hal_sys_restore_rt ()
>>     at /home/pitrolle/ecos/ecos/packages/hal/synth/i386linux/current/src/syscall-i386-linux-1.0.S:446
>> #6  0x00000004 in ?? ()
>> #7  0x0100418c in idle_thread_main (data=0)
>>     at /home/pitrolle/ecos/ecos/packages/kernel/current/src/common/thread.cxx:1231
>> #8  0x01004be0 in Cyg_HardwareThread::thread_entry (thread=0x20004c0)
>>     at /home/pitrolle/ecos/ecos/packages/kernel/current/src/common/thread.cxx:95
>> #9  0x00000000 in ?? ()
>> 
>> I have severals questions :
>>  - What is the real aim of cyg_hal_sys_restore_rt?
>>  - If I want to get the context of the thread on the exception handler (info about saved registers like previous pc,sp,...) , what can i process?
> 
> Note: if you're trying to use the SWI exception, then I think
> you need to apply the attached patch (I've not had a chance to
> try it as I don't have access to ARM hardware).
> 
> -- 
> ------------------------------------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
> ------------------------------------------------------------

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