text: /****************************************************************************
   * arch/mips/src/pic32mx/pic32mx-exception.c
   *
   *   Copyright (C) 2011-2012, 2015 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  #include <assert.h>
  #include <debug.h>
  
  #include <nuttx/irq.h>
  #include <nuttx/arch.h>
  #include <nuttx/board.h>
  
  #include <arch/board/board.h>
  #include <arch/pic32mx/cp0.h>
  
  #include "up_arch.h"
  
  #include "pic32mx-int.h"
  #include "pic32mx.h"
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Data
   ****************************************************************************/
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /************************************************************************************
   * Name: pic32mx_exception
   *
   * Description:
   *   Called from assembly language logic on all other exceptions.
   *
   ************************************************************************************/
  
  uint32_t *pic32mx_exception(uint32_t *regs)
  {
  #ifdef CONFIG_DEBUG_FEATURES
    uint32_t cause;
    uint32_t epc;
  #endif
  
    /* If the board supports LEDs, turn on an LED now to indicate that we are
     * processing an interrupt.
     */
  
    board_autoled_on(LED_INIRQ);
  
  #ifdef CONFIG_DEBUG_FEATURES
    /* Get the cause of the exception from the CAUSE register */
  
    asm volatile("\tmfc0 %0,$13,0\n" : "=r"(cause));
    asm volatile("\tmfc0 %0,$14,0\n" : "=r"(epc));
  
  #ifdef CONFIG_DEBUG_INFO
    switch (cause & CP0_CAUSE_EXCCODE_MASK)
      {
      case CP0_CAUSE_EXCCODE_INT:      /* Interrupt */
        llinfo("EXCEPTION: Interrupt"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_TLBL:     /* TLB exception (load or instruction fetch) */
        llinfo("EXCEPTION: TLB exception (load or instruction fetch)"
               " CAUSE: %08x EPC:%08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_TLBS:     /* TLB exception (store) */
        llinfo("EXCEPTION: TLB exception (store)"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_ADEL:     /* Address error exception (load or instruction fetch) */
        llinfo("EXCEPTION: Address error exception (load or instruction fetch)"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_ADES:     /* Address error exception (store) */
        llinfo("EXCEPTION: Address error exception (store)"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_IBE:      /* Bus error exception (instruction fetch) */
        llinfo("EXCEPTION: Bus error exception (instruction fetch)"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_DBE:      /* Bus error exception (data reference: load or store) */
        llinfo("EXCEPTION: Bus error exception (data reference: load or store)"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_SYS:      /* Syscall exception */
        llinfo("EXCEPTION: Syscall exception"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_BP:       /* Breakpoint exception */
        llinfo("EXCEPTION: Breakpoint exception"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_RI:       /* Reserved instruction exception */
        llinfo("EXCEPTION: Reserved instruction exception"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_CPU:      /* Coprocessor Unusable exception */
        llinfo("EXCEPTION: Coprocessor Unusable exception"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_OV:       /* Arithmetic Overflow exception */
        llinfo("EXCEPTION: Arithmetic Overflow exception"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_TR:       /* Trap exception */
        llinfo("EXCEPTION: Trap exception"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_FPE:      /* Floating point exception */
        llinfo("EXCEPTION: Floating point exception"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_C2E:      /* Precise Coprocessor 2 exceptions */
        llinfo("EXCEPTION: Precise Coprocessor 2 exceptions"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_MDMX:     /* MDMX Unusable (MIPS64) */
        llinfo("EXCEPTION: MDMX Unusable (MIPS64)"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_WATCH:    /* WatchHi/WatchLo address */
        llinfo("EXCEPTION: WatchHi/WatchLo address"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_MCHECK:   /* Machine check */
        llinfo("EXCEPTION: Machine check"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      case CP0_CAUSE_EXCCODE_CACHEERR: /* Cache error */
        llinfo("EXCEPTION: Cache error"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      default:
        llinfo("EXCEPTION: Unknown"
               " CAUSE: %08x EPC: %08x\n", cause, epc);
        break;
      }
  #else
    llerr("EXCEPTION: CAUSE: %08x EPC: %08x\n", cause, epc);
  #endif
  #endif
  
    /* Crash with currents_regs set so that we can dump the register contents. */
  
    g_current_regs = regs;
    PANIC();
    return regs; /* Won't get here */
  }
  