[ECOS] how work synthetic for exceptions

[trollepi jj <jackoaway@hotmail.com>]

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?

Thank for future help, Best Regars
jjp
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