spurious.c

/*
 *  LEON Spurious Trap Handler
 *
 *  This is just enough of a trap handler to let us know what
 *  the likely source of the trap was.
 *
 *  Developed as part of the port of RTEMS to the LEON implementation
 *  of the SPARC by On-Line Applications Research Corporation (OAR)
 *  under contract to the European Space Agency (ESA).
 *
 *  COPYRIGHT (c) 1995. European Space Agency.
 *
 *  Modified for LEON3 BSP.
 *  COPYRIGHT (c) 2004.
 *  Gaisler Research.
 *
 *  This terms of the RTEMS license apply to this file.
 */

#include <bsp.h>
#include <rtems/score/cpu.h>
#include <rtems/bspIo.h>
#include <inttypes.h>

void _CPU_Exception_frame_print( const CPU_Exception_frame *frame )
{
  uint32_t                   trap;
  uint32_t                   real_trap;
  const CPU_Interrupt_frame *isf;

  trap = frame->trap;
  real_trap = SPARC_REAL_TRAP_NUMBER(trap);
  isf = frame->isf;

  printk(
    "Unexpected trap (%2" PRId32 ") at address 0x%08" PRIx32 "\n",
    real_trap,
    isf->tpc
  );

  switch (real_trap) {

    /*
     *  First the ones defined by the basic architecture
     */

    case 0x00:
      printk( "reset\n" );
      break;
    case 0x01:
      printk( "instruction access exception\n" );
      break;
    case 0x02:
      printk( "illegal instruction\n" );
      break;
    case 0x03:
      printk( "privileged instruction\n" );
      break;
    case 0x04:
      printk( "fp disabled\n" );
      break;
    case 0x07:
      printk( "memory address not aligned\n" );
      break;
    case 0x08:
      printk( "fp exception\n" );
      break;
    case 0x0A:
      printk( "tag overflow\n" );
      break;

    /*
     *  Then the ones defined by the LEON in particular
     */
      /* FIXME */

      /*
    case LEON_TRAP_TYPE( LEON_INTERRUPT_CORRECTABLE_MEMORY_ERROR ):
      printk( "LEON_INTERRUPT_CORRECTABLE_MEMORY_ERROR\n" );
      break;
    case LEON_TRAP_TYPE( LEON_INTERRUPT_UART_2_RX_TX ):
      printk( "LEON_INTERRUPT_UART_2_RX_TX\n" );
      break;
    case LEON_TRAP_TYPE( LEON_INTERRUPT_UART_1_RX_TX ):
      printk( "LEON_INTERRUPT_UART_1_RX_TX\n" );
      break;
    case LEON_TRAP_TYPE( LEON_INTERRUPT_EXTERNAL_0 ):
      printk( "LEON_INTERRUPT_EXTERNAL_0\n" );
      break;
    case LEON_TRAP_TYPE( LEON_INTERRUPT_EXTERNAL_1 ):
      printk( "LEON_INTERRUPT_EXTERNAL_1\n" );
      break;
    case LEON_TRAP_TYPE( LEON_INTERRUPT_EXTERNAL_2 ):
      printk( "LEON_INTERRUPT_EXTERNAL_2\n" );
      break;
    case LEON_TRAP_TYPE( LEON_INTERRUPT_EXTERNAL_3 ):
      printk( "LEON_INTERRUPT_EXTERNAL_3\n" );
      break;
    case LEON_TRAP_TYPE( LEON_INTERRUPT_TIMER1 ):
      printk( "LEON_INTERRUPT_TIMER1\n" );
      break;
    case LEON_TRAP_TYPE( LEON_INTERRUPT_TIMER2 ):
      printk( "LEON_INTERRUPT_TIMER2\n" );
      break;
      */

    default:
      break;
  }
}

static rtems_isr bsp_spurious_handler(
   rtems_vector_number trap,
   CPU_Interrupt_frame *isf
)
{
  CPU_Exception_frame frame = {
    .trap = trap,
    .isf = isf
  };

#if !defined(SPARC_USE_LAZY_FP_SWITCH)
  if ( SPARC_REAL_TRAP_NUMBER( trap ) == 4 ) {
    _Internal_error( INTERNAL_ERROR_ILLEGAL_USE_OF_FLOATING_POINT_UNIT );
  }
#endif

  rtems_fatal(
    RTEMS_FATAL_SOURCE_EXCEPTION,
    (rtems_fatal_code) &frame
  );
}

/*
 *  bsp_spurious_initialize
 *
 *  Install the spurious handler for most traps. Note that set_vector()
 *  will unmask the corresponding asynchronous interrupt, so the initial
 *  interrupt mask is restored after the handlers are installed.
 */

void bsp_spurious_initialize()
{
  uint32_t trap;
  uint32_t level;
  /* uint32_t mask; */

  level = sparc_disable_interrupts();
  /* mask = LEON3_IrqCtrl_Regs->mask_p0; */

  for ( trap=0 ; trap<256 ; trap++ ) {

    /*
     *  Skip window overflow, underflow, and flush as well as software
     *  trap 0,9,10 which we will use as a shutdown, IRQ disable, IRQ enable.
     *  Also avoid trap 0x70 - 0x7f which cannot happen and where some of the
     *  space is used to pass parameters to the program.
     */

    if (( trap == 5 ) || ( trap == 6 ) ||
#if defined(SPARC_USE_LAZY_FP_SWITCH)
        ( trap == 4 ) ||
#endif
        (( trap >= 0x11 ) && ( trap <= 0x1f )) ||
        (( trap >= 0x70 ) && ( trap <= 0x83 )) ||
        ( trap == 0x80 + SPARC_SWTRAP_IRQDIS ) ||
#if defined(SPARC_USE_SYNCHRONOUS_FP_SWITCH)
        ( trap == 0x80 + SPARC_SWTRAP_IRQDIS_FP ) ||
#endif
        ( trap == 0x80 + SPARC_SWTRAP_IRQEN ))
      continue;

    set_vector(
        (rtems_isr_entry) bsp_spurious_handler,
        SPARC_SYNCHRONOUS_TRAP( trap ),
        1
    );
  }

  /* LEON3_IrqCtrl_Regs->mask_p0 = mask; */
  sparc_enable_interrupts(level);

}