void nOS_SwitchContext(void)
{
SAVE_CONTEXT();
nOS_runningThread = nOS_highPrioThread;
RESTORE_CONTEXT();
asm volatile ("ret");
}
void
segv_handler(HANDLER_ARGS)
{
os_context_t *os_context = (os_context_t *) context;
caddr_t addr = code->si_addr;
SAVE_CONTEXT();
#ifdef RED_ZONE_HIT
if (os_control_stack_overflow(addr, context))
return;
#endif
if (gc_write_barrier(code->si_addr))
return;
/*
* Could be a C stack overflow. Let's check
*/
{
struct rlimit rlimit;
if (getrlimit(RLIMIT_STACK, &rlimit) == 0) {
/* The stack top here is based on the notes in sparc-validate.h */
char *stack_top = (char *) 0xffbf0000;
char *stack_bottom;
stack_bottom = stack_top - rlimit.rlim_cur;
/*
* Add a fudge factor. Don't know why, but we get the signal
* sometime after the bottom of the stack, as computed above,
* has been reached. (It seems to be 8K, so we use something
* larger.)
*/
stack_bottom -= 16384;
if ((stack_bottom <= addr) && (addr <= stack_top)) {
fprintf(stderr,
"\nsegv_handler: C stack overflow. Try increasing stack limit (%ld).\n",
rlimit.rlim_cur);
segv_handle_now(signal, code, context);
}
} else {
perror("getrlimit");
}
}
/* a *real* protection fault */
fprintf(stderr, "segv_handler: Real protection violation: %p, PC = %p\n",
addr,
os_context->uc_mcontext.gregs[1]);
real_segv_handler(signal, code, context);
}
void port_reschedule(void)
{
SAVE_CONTEXT();
log_line(running_task->name);
log_string(" --> ");
reschedule();
timer_tick = RR_TIMEOUT_MS;
log_string(running_task->name);
RESTORE_CONTEXT();
/* The RETI instruction enables interrupts. */
__asm__ __volatile__ ("reti \n\t");
}
ISR(TIMER0_COMP_vect, ISR_NAKED) {
SAVE_CONTEXT();
/* Decide if a task change shall occur. We know that
running_task is in the ready list. */
if (0 == timer_tick) {
list_remove_node((Node *) running_task);
list_enqueue(&ready_tasks, (Node *) running_task);
reschedule();
timer_tick = RR_TIMEOUT_MS;
} else {
timer_tick--;
}
RESTORE_CONTEXT();
__asm__ __volatile__ ("reti \n\t");
}
void
segv_handler(HANDLER_ARGS)
{
caddr_t addr = code->si_addr;
SAVE_CONTEXT();
#ifdef RED_ZONE_HIT
if (os_control_stack_overflow(addr, context))
return;
#endif
if (!interrupt_maybe_gc(signal, code, context)) {
/* a *real* protection fault */
fprintf(stderr, "segv_handler: Real protection violation: 0x%08x\n",
addr);
interrupt_handle_now(signal, code, context);
}
}
void p_pos_softContextSwitch(void) {
SAVE_CONTEXT();
posCurrentTask_g->stackptr = (void*)SP;
asm volatile("jmp p_pos_intContextSwitch");
}