/*
*
* Support for gnat/rtems interrupts and exception handling.
* Jiri Gaisler, ESA/ESTEC, 17-02-1999.
*
*/
#include <unistd.h> /* getpid */
#include <bsp.h>
#include <rtems/bspIo.h>
#include <signal.h>
#include <stdlib.h>
#include <bsp/gnatcommon.h>
/*
* Synchronous trap handler. Map the trap number of SIGFPE, SIGSEGV
* or SIGILL to generate the corresponding Ada exception.
*/
static rtems_isr
__gnat_exception_handler(rtems_vector_number trap)
{
uint32_t real_trap;
uint32_t signal;
real_trap = SPARC_REAL_TRAP_NUMBER (trap);
switch (real_trap)
{
case 0x08: /* FPU exception */
case 0x0A: /* TAG overflow */
case 0x82: /* divide by zero */
signal = SIGFPE; /* Will cause Constraint_Error */
break;
case 0x01: /* Instruction access exception */
case 0x09: /* Data access exception */
signal = SIGSEGV; /* Will cause Storage_Error */
break;
default: /* Anything else ... */
signal = SIGILL; /* Will cause Program_Error */
break;
}
kill (getpid (), signal);
}
/*
* Asynchronous trap handler. As it happens, the interrupt trap numbers for
* SPARC is 17 - 31, so we just map then directly on the same signal number.
*/
static rtems_isr
__gnat_interrupt_handler (rtems_vector_number trap)
{
uint32_t real_trap;
real_trap = SPARC_REAL_TRAP_NUMBER (trap);
kill (getpid (), real_trap);
}
/*
* Default signal handler with error reporting
*/
static void
__gnat_signals_Abnormal_termination_handler (int signo)
{
switch (signo)
{
case SIGFPE:
printk("\nConstraint_Error\n");
break;
case SIGSEGV:
printk("\nStorage_Error\n");
break;
default:
printk("\nProgram_Error\n");
break;
}
exit (1);
}
const struct sigaction __gnat_error_vector =
{0, -1,
{__gnat_signals_Abnormal_termination_handler}};
void
__gnat_install_handler_common (int t1, int t2)
{
uint32_t trap;
rtems_isr_entry previous_isr;
sigaction (SIGSEGV, &__gnat_error_vector, NULL);
sigaction (SIGFPE, &__gnat_error_vector, NULL);
sigaction (SIGILL, &__gnat_error_vector, NULL);
for (trap = 0; trap < 256; trap++)
{
/*
* Skip window overflow, underflow, and flush as well as software
* trap 0 which we will use as a shutdown. Also avoid trap 0x70 - 0x7f
* which cannot happen and where some of the space is used to pass
* paramaters to the program. 0x80 for system traps and
* 0x81 - 0x83 by the remote debugging stub.
* Avoid two bsp specific interrupts which normally are used
* by the real-time clock and UART B.
*/
if ((trap >= 0x11) && (trap <= 0x1f))
{
if ((trap != t1) && (trap != t2))
rtems_interrupt_catch (__gnat_interrupt_handler, trap, &previous_isr);
}
else if ((trap != 5 && trap != 6) && ((trap < 0x70) || (trap > 0x83)))
set_vector (__gnat_exception_handler, SPARC_SYNCHRONOUS_TRAP (trap), 1);
}
}
