void __attribute__((weak, nomips16)) _general_exception_handler (void)
{
char buff[SYS_CONSOLE_BUFFER_LEN];
uint32_t epc, cause;
int cause_ix;
const char* cause_str;
snprintf(buff, SYS_CONSOLE_BUFFER_LEN, "\n\rSystem Exception Handler entered.\n\r");
(debug_handle->pObj->print)(debug_handle->obHandle, buff);
epc = _CP0_GET_EPC();
cause = _CP0_GET_CAUSE();
cause_ix = (cause & _CP0_CAUSE_EXCCODE_MASK) >> _CP0_CAUSE_EXCCODE_POSITION;
if(cause_ix < sizeof(_sys_excep_tbl)/sizeof(*_sys_excep_tbl))
{
cause_str = _sys_excep_tbl[cause_ix];
}
else
{
cause_str = "Unidentified";
}
snprintf(buff, SYS_CONSOLE_BUFFER_LEN, "\n\rA %s type exception occurred at address: 0x%08x\n\r", cause_str, epc);
(debug_handle->pObj->print)(debug_handle->obHandle, buff);
snprintf(buff, SYS_CONSOLE_BUFFER_LEN, "\n\rSystem will halt!\n\r");
(debug_handle->pObj->print)(debug_handle->obHandle, buff);
// break into the debugger
__asm__ volatile (" sdbbp 0");
}
void _general_exception_handler(unsigned cause, unsigned status)
{
#if defined(DEBUG_MODE)
unsigned long address = _CP0_GET_EPC();
#endif
while(1){}
}
void _general_exception_handler(unsigned cause, unsigned status)
{
unsigned long address = _CP0_GET_EPC();
while(1){}
}
/******************************************************************************/
/* Exception Handling */
/******************************************************************************/
/* This function overrides the normal _weak_ _generic_exception_handler which
is defined in the C32 User's Guide. The _weak_ _generic_exception_handler
just does an infinite loop. */
void _general_exception_handler(void)
{
// unsigned long t0 = _CP0_GET_COUNT(); /* Used for NVMOP 6 us Delay */
/* Mask off Mask of the ExcCode Field from the Cause Register
Refer to the MIPs M4K Software User's manual */
_excep_code=_CP0_GET_CAUSE() & 0x0000007C >> 2;
_excep_addr=_CP0_GET_EPC();
_CP0_SET_STATUS(_CP0_GET_STATUS()&0xFFFFFFE); /* Disable Interrupts */
#ifdef WRITE_EXCEPTION_CAUSE_TO_FLASH
/* Store the exception causes in program memory in case the part exhibited
the problem in release mode. Gives user a place to start debugging
the problem. */
NVMCON = 0x4001; /* set WREN and Word Programing mode */
NVMADDR = EXCEPTION_CAUSE; /* PM Address at which we'll store the */
/* cause register */
NVMDATA = _excep_code;
/* wait at least 6 us for LVD start-up
/* This function overrides the normal _weak_ _generic_exception_handler which
is defined in the C32 User's Guide. The _weak_ _generic_exception_handler
just does an infinite loop. */
void _general_exception_handler(void)
{
unsigned long t0 = _CP0_GET_COUNT(); /* Used for NVMOP 6 us Delay */
/* Mask off Mask of the ExcCode Field from the Cause Register
Refer to the MIPs M4K Software User's manual */
_excep_code=_CP0_GET_CAUSE() & 0x0000007C >> 2;
_excep_addr=_CP0_GET_EPC();
_CP0_SET_STATUS(_CP0_GET_STATUS()&0xFFFFFFE); /* Disable Interrupts */
#ifdef WRITE_EXCEPTION_CAUSE_TO_FLASH
/* Store the exception causes in program memory in case the part exhibited
the problem in release mode. Gives user a place to start debugging
the problem. */
NVMCON = 0x4001; /* set WREN and Word Programing mode */
NVMADDR = EXCEPTION_CAUSE; /* PM Address at which we'll store the */
/* cause register */
NVMDATA = _excep_code;
/* wait at least 6 us for LVD start-up
assume we're running at max frequency
(80 MHz) so we're always safe */
{
while (_CP0_GET_COUNT() - t0 < (80/2)*6);
}
NVMKEY = 0xAA996655;
NVMKEY = 0x556699AA; /* unlock sequence */
NVMCONSET = NVMCON_WR;
while(NVMCON & NVMCON_WR); /* wait on write to finish */
NVMCON = 0x4001; /* set WREN and Word Programing mode */
NVMADDR = EXCEPTION_ADDR; /* PM Address at which we'll store the */
/* exception address register */
NVMDATA = _excep_addr;
/* wait at least 6 us for LVD start-up
assume we're running at max frequency
(80 MHz) so we're always safe */
{
while (_CP0_GET_COUNT() - t0 < (80/2)*6);
}
NVMKEY = 0xAA996655;
NVMKEY = 0x556699AA; /* unlock sequence */
NVMCONSET = NVMCON_WR;
while(NVMCON & NVMCON_WR);
/* Write the exception cause and address to the part can be read and
the cause determined. */
NVMWriteWord((void*)EXCEPTION_CAUSE, _excep_code);
NVMWriteWord((void*)EXCEPTION_ADDR, _excep_addr);
#endif
while (1)
{
/* Examine _excep_code to identify the type of exception */
/* Examine _excep_addr to find the address that caused the exception */
}
}
