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
------------------------------------------------------------
Index: hal/arm/arch/current/src/vectors.S
===================================================================
--- hal/arm/arch/current/src/vectors.S (revision 3391)
+++ hal/arm/arch/current/src/vectors.S (working copy)
@@ -539,7 +539,8 @@
tst r1,#CPSR_THUMB_ENABLE
subeq r0,lr,#4 // PC at time of SWI (ARM)
subne r0,lr,#2 // PC at time of SWI (thumb)
- mov r2,#CYGNUM_HAL_EXCEPTION_INTERRUPT
+ mov r2,#CYGNUM_HAL_EXCEPTION_SOFTWARE_INTERRUPT
+ mov r3,sp
b call_exception_handler
.code 32
--
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