/*
* Trap handler
* Invoke the exception handler if it is needed.
*/
void
trap_handler(struct cpu_regs *regs)
{
uint32_t trap_no = regs->trap_no;
#ifdef CONFIG_MMU
switch (trap_no) {
case TRAP_DATA_TLB_MISS:
case TRAP_INST_TLB_MISS:
handle_tlb_miss(regs);
return;
};
#endif
#ifdef DEBUG
printf("============================\n");
printf("Trap %x: %s\n", trap_no, trap_name[trap_no]);
printf("============================\n");
trap_dump(regs);
for (;;) ;
#endif
if ((regs->srr1 & MSR_PR) != MSR_PR)
panic("Kernel exception");
exception_mark(exception_map[trap_no]);
exception_deliver();
}
void trap_dump_die(struct trap_state *st)
{
about_to_die(1);
trap_dump(st);
die("terminated due to trap\n");
}
void
context_dump(context_t ctx)
{
#ifdef DEBUG
trap_dump(ctx->uregs);
#endif
}
void default_exception_handler(tf_t *tf)
{
unsigned int cur_pid;
cur_pid = get_curid();
trap_dump(tf);
KERN_PANIC("Trap %d @ 0x%08x.\n", tf -> trapno, tf -> eip);
}
void pgflt_handler(tf_t *tf)
{
unsigned int cur_pid;
unsigned int errno;
unsigned int fault_va;
cur_pid = get_curid();
errno = tf -> err;
fault_va = rcr2();
//Uncomment this line if you need to see the information of the sequence of page faults occured.
//KERN_DEBUG("Page fault: VA 0x%08x, errno 0x%08x, process %d, EIP 0x%08x.\n", fault_va, errno, cur_pid, tf -> eip);
if (errno & PFE_PR) {
trap_dump(tf);
KERN_PANIC("Permission denied: va = 0x%08x, errno = 0x%08x.\n", fault_va, errno);
return;
}
if (alloc_page(cur_pid, fault_va, PTE_W | PTE_U | PTE_P) == MagicNumber)
KERN_PANIC("Page allocation failed: va = 0x%08x, errno = 0x%08x.\n", fault_va, errno);
}
void base_irq_softint_default_handler(struct trap_state *ts)
{
trap_dump(ts);
panic("unexpected software interrupt");
}
