Subversion Repositories openrisc

#include "or1200-utils.h"

#include "int.h" // User interrupt handler header

#include "uart.h"

#include "printf.h"

#define STR_EXCEPTION_OCCURED " exception occured.\n"

char *exception_strings[] = {

  "An unknown",             // 0

  "A reset (?!)",           // 1 

  "A Bus Error",            // 2

  "A Data Page Fault",      // 3

  "An Instruction Page Fault", // 4

  "A Tick-Timer",              // 5

  "An Alignment",              // 6

  "An Illegal Instruction",    // 7

  "An External Interrupt",     // 8

  "A D-TLB Miss",              // 9

  "An I-TLB Miss",             // a

  "A Range",                   // b

  "A System Call",             // c

  "A Floating-Point",          // d

  "A Trap",                    // e

  "A \"Reserved\"",            // f

  "A \"Reserved\"",            // 10

  "A \"Reserved\"",            // 11

  "A \"Reserved\"",            // 12

  "A \"Reserved\"",            // 13

  "A \"Reserved\"",            // 14

  "An Implementation Specific \"Reserved\"", // 16

  "An Implementation Specific \"Reserved\"", // 17

  "An Implementation Specific \"Reserved\"", // 18

  "A Custom",                                // 19

  "A Custom",                                // 1a

  "A Custom",                                // 1b

  "A Custom",                                // 1c

  "A Custom",                                // 1d

  "A Custom",                                // 1e

  "A Custom",                                // 1f

};

extern void int_main();

extern void cpu_timer_tick();

void (*except_handlers[]) (void ) = {0,    // 0

                                    0,    // 1

                                    0,    // 2

                                    0,    // 3

                                    0,    // 4

                                    cpu_timer_tick,    // 5

                                    0,    // 6

                                    0,    // 7

                                    int_main,    // 8

                                    0,    // 9

                                    0,    // a

                                    0,    // b

                                    0,    // c

                                    0,    // d

                                    0,    // e

                                    0,    // f

                                    0,    // 10

                                    0,    // 11

                                    0,    // 12

                                    0};    // 13

void

add_handler(unsigned long vector, void (*handler) (void *))

{

  except_handlers[vector] = handler;

}

void default_exception_handler_c(unsigned exception_address,unsigned epc)

{

  int exception_no = (exception_address >> 8) & 0x1f;

  if (except_handlers[exception_no])

    {

      return (*except_handlers[exception_no])();

    }

  // Init uart here, incase it hasn't been

  uart_init(DEFAULT_UART);

  printf("EPC = 0x%.8x\n", exception_address);

  // Output initial messaging using low-level functions incase

  // something really bad happened.

  printf("%s%s", exception_strings[exception_no],

         STR_EXCEPTION_OCCURED);

  // Icing on the cake using fancy functions

  printf("EPC = 0x%.8x\n", epc);

  report(exception_address);

  report(epc);

  __asm__("l.nop 1");

  for(;;);

}