On Tue, Dec 3, 2019 at 8:48 AM Schweikhardt, Jens (TSPCE3-TL4) < jens.schweikha...@tesat.de> wrote:
> Hello, world\n > > > > I have a question about the use of trap 4 by RTEMS on Sparc32 (leon3). > > Since our app needs FP, we set the PSR[EF] bit during the boot process > before RTEMS is invoked. > > Since we don’t expect the fp_disabled trap (4) to occur, we install a > fatal handler for it with > > rtems_interrupt_catch(&fatalTrapHandler, 4, &old); > > > > However, the fatalTrapHandler is invoked a short time after application > start (we use the Init() task > > and start a handful of additional tasks, all of which have attribute > RTEMS_FLOATING_POINT) > > and the PSR[EF] bit is indeed cleared. None of our tasks > > clears that bit, so we suspect RTEMS does it for some reason. > Is the Init task floating point? What thread is executing when the trap occurs? The IDLE thread is likely integer only if you are looking at it is running. > > > Question: is an RTEMS/sparc application allowed to install a handler for > trap 4? I could not find an > > answer in the docs for SPARC Specific Information. > I think that's OK. > > > Thanks for any insight! > Regards, Jens > > > > ------------------------------ > > Tesat-Spacecom GmbH & Co. KG > Sitz: Backnang; Registergericht: Amtsgericht Stuttgart HRA 270977 > Persoenlich haftender Gesellschafter: Tesat-Spacecom Geschaeftsfuehrungs > GmbH; > Sitz: Backnang; Registergericht: Amtsgericht Stuttgart HRB 271658; > Geschaeftsfuehrung: Dr. Marc Steckling, Kerstin Basche, Ralf Zimmermann > > [image: banner] > _______________________________________________ > users mailing list > users@rtems.org > http://lists.rtems.org/mailman/listinfo/users
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