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  1. /*
  2.  * Copyright (C) 2003-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <arch/exception.h>
  30. #include <arch/interrupt.h>
  31. #include <panic.h>
  32. #include <arch/cp0.h>
  33. #include <arch/types.h>
  34. #include <arch.h>
  35. #include <debug.h>
  36.  
  37. void exception(struct exception_regdump *pstate)
  38. {
  39.     int excno;
  40.     __u32 epc_shift = 0;
  41.  
  42.     ASSERT(CPU != NULL);
  43.  
  44.     /*
  45.      * NOTE ON OPERATION ORDERING
  46.      *
  47.      * On entry, cpu_priority_high() must be called before
  48.      * exception bit is cleared.
  49.      */
  50.  
  51.     cpu_priority_high();
  52.     cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit |
  53.                         cp0_status_um_bit));
  54.     /* Save pstate so that the threads can access it */
  55.     if (THREAD)
  56.         THREAD->pstate = pstate;
  57.  
  58.     /* decode exception number and process the exception */
  59.     switch (excno = (cp0_cause_read() >> 2) & 0x1f) {
  60.         case EXC_Int:
  61.             interrupt();
  62.             break;
  63.         case EXC_TLBL:
  64.         case EXC_TLBS:
  65.             tlb_invalid(pstate);
  66.             break;
  67.         case EXC_Mod:
  68.             panic("unhandled TLB Modification Exception\n");
  69.             break;
  70.         case EXC_AdEL:
  71.             panic("unhandled Address Error Exception - load or instruction fetch\n");
  72.             break;
  73.         case EXC_AdES:
  74.             panic("unhandled Address Error Exception - store\n");
  75.             break;
  76.         case EXC_IBE:
  77.             panic("unhandled Bus Error Exception - fetch instruction\n");
  78.             break;
  79.         case EXC_DBE:
  80.             panic("unhandled Bus Error Exception - data reference: load or store\n");
  81.             break;
  82.         case EXC_Bp:
  83.             /* it is necessary to not re-execute BREAK instruction after returning from Exception handler
  84.                (see page 138 in R4000 Manual for more information) */
  85.             epc_shift = 4;
  86.             break;
  87.         case EXC_RI:
  88.             panic("unhandled Reserved Instruction Exception\n");
  89.             break;
  90.         case EXC_CpU:
  91. #ifdef FPU_LAZY    
  92.             scheduler_fpu_lazy_request();
  93. #else
  94.             panic("unhandled Coprocessor Unusable Exception\n");
  95. #endif
  96.             break;
  97.         case EXC_Ov:
  98.             panic("unhandled Arithmetic Overflow Exception\n");
  99.             break;
  100.         case EXC_Tr:
  101.             panic("unhandled Trap Exception\n");
  102.             break;
  103.         case EXC_VCEI:
  104.             panic("unhandled Virtual Coherency Exception - instruction\n");
  105.             break;
  106.         case EXC_FPE:
  107.             panic("unhandled Floating-Point Exception\n");
  108.             break;
  109.         case EXC_WATCH:
  110.             panic("unhandled reference to WatchHi/WatchLo address\n");
  111.             break;
  112.         case EXC_VCED:
  113.             panic("unhandled Virtual Coherency Exception - data\n");
  114.             break;
  115.         default:
  116.             panic("unhandled exception %d\n", excno);
  117.     }
  118.    
  119.     pstate->epc += epc_shift;
  120.     /* Probable not needed, but just for sure that nobody
  121.      * will continue accessing it */
  122.     if (THREAD)
  123.         THREAD->pstate = NULL;
  124. }
  125.