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/*
* ISR Vectoring support for the Synova Mongoose-V.
*
* COPYRIGHT (c) 1989-2001.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <rtems.h>
#include <stdlib.h>
#define mips_get_cause( _cause ) \
do { \
asm volatile( "mfc0 %0, $13; nop" : "=r" (_cause) : ); \
} while (0)
#define CALL_ISR(_vector) \
do { \
if ( _ISR_Vector_table[_vector] ) \
(_ISR_Vector_table[_vector])(_vector); \
else \
mips_default_exception_code_handler(_vector); \
} while (0)
#include <bspIo.h> /* for printk */
char *cause_strings[32] = {
/* 0 */ "Int",
/* 1 */ "TLB Mods",
/* 2 */ "TLB Load",
/* 3 */ "TLB Store",
/* 4 */ "Address Load",
/* 5 */ "Address Store",
/* 6 */ "Instruction Bus Error",
/* 7 */ "Data Bus Error",
/* 9 */ "Syscall",
/* 10 */ "Breakpoint",
/* 11 */ "Reserved Instruction",
/* 12 */ "Coprocessor Unuseable",
/* 13 */ "Overflow",
/* 14 */ "Trap",
/* 15 */ "Instruction Virtual Coherency Error",
/* 16 */ "FP Exception",
/* 17 */ "Reserved 17",
/* 18 */ "Reserved 17",
/* 19 */ "Reserved 17",
/* 20 */ "Reserved 20",
/* 21 */ "Reserved 21",
/* 22 */ "Reserved 22",
/* 23 */ "Watch",
/* 24 */ "Reserved 24",
/* 25 */ "Reserved 25",
/* 26 */ "Reserved 26",
/* 27 */ "Reserved 27",
/* 28 */ "Reserved 28",
/* 29 */ "Reserved 29",
/* 30 */ "Reserved 30",
/* 31 */ "Data Virtual Coherency Error"
};
void mips_default_exception_code_handler( int exc, CPU_Interrupt_frame *frame )
{
unsigned int sr;
unsigned int cause;
mips_get_cause( cause );
printk( "Unhandled exception cause %d\n", exc );
printk( "sr: 0x%08x", sr );
printk( "cause: 0x%08x --> %s", cause, cause_strings[(cause >> 2) &0x1f] );
/* XXX dump frame once defined */
rtems_fatal_error_occurred(1);
}
void mips_vector_exceptions( CPU_Interrupt_frame *frame )
{
unsigned int cause;
int exc;
mips_get_cause( cause );
exc = (cause >> 2) &0x1f;
printk( "Exception!\n" );
mips_default_exception_code_handler( exc, frame );
}
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