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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">Hello *,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">I'm trying to install interrupt and trap handlers for interrupts and<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">traps not used by RTEMS 5 on a RISC-V32 rocket chip system.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">In "Volume II: RISC-V Privileged Architectures" I found<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">"Table 3.6: Machine cause register (mcause) values." listing<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">the interrupts and traps:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">Interrupt Exception Code Description<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 0 User software interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 1 Supervisor software interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 2 Hypervisor software interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 3 Machine software interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 4 User timer interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 5 Supervisor timer interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 6 Hypervisor timer interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 7 Machine timer interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 8 User external interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 9 Supervisor external interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 10 Hypervisor external interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 11 Machine external interrupt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">1 >=12 Reserved<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 0 Instruction address misaligned<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 1 Instruction access fault<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 2 Illegal instruction<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 3 Breakpoint<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 4 Load address misaligned<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 5 Load access fault<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 6 Store/AMO address misaligned<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 7 Store/AMO access fault<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 8 Environment call from U-mode<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 9 Environment call from S-mode<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 10 Environment call from H-mode<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 11 Environment call from M-mode<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">0 >=12 Reserved<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">The RTEMS RISC-V docs specify that unhandled exceptions invoke<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">the fatal error handler with RTEMS_FATAL_SOURCE_EXCEPTION.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">I want to change this so a custom handler is called. I believe<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">I should use rtems_interrupt_catch(handler, <number>, &old)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">but I am unsure what number to use for interrupt versus trap from<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">the table above. E.g. how would I install a handler for, say,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">interrupt 11 (Machine external interrup) and how for<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">trap 11 (Environment call from M-mode)?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">Which of these are used by RTEMS and should not be touched?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">Thanks for any hints.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tw Cen MT",sans-serif">Jens<o:p></o:p></span></p>
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