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<p class="MsoNormal"><span lang="DE">Hello, world\n<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE"><o:p> </o:p></span></p>
<p class="MsoNormal">I have a question about the use of trap 4 by RTEMS on Sparc32 (leon3).<o:p></o:p></p>
<p class="MsoNormal">Since our app needs FP, we set the PSR[EF] bit during the boot process before RTEMS is invoked.<o:p></o:p></p>
<p class="MsoNormal">Since we don’t expect the fp_disabled trap (4) to occur, we install a fatal handler for it with<o:p></o:p></p>
<p class="MsoNormal">rtems_interrupt_catch(&fatalTrapHandler, 4, &old);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">However, the fatalTrapHandler is invoked a short time after application start (we use the Init() task<o:p></o:p></p>
<p class="MsoNormal">and start a handful of additional tasks, all of which have attribute RTEMS_FLOATING_POINT)<o:p></o:p></p>
<p class="MsoNormal">and the PSR[EF] bit is indeed cleared. None of our tasks<o:p></o:p></p>
<p class="MsoNormal">clears that bit, so we suspect RTEMS does it for some reason.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Question: is an RTEMS/sparc application allowed to install a handler for trap 4? I could not find an<o:p></o:p></p>
<p class="MsoNormal">answer in the docs for SPARC Specific Information.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for any insight!<br>
Regards, Jens<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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