struct thread *fault_page(struct thread *image) {
uint32_t cr2;
/* Get faulting address from register CR2 */
cr2 = cpu_get_cr2();
/* If in kernelspace, panic */
if ((image->cs & 0x3) == 0) { /* i.e. if it was kernelmode */
debug_printf("page fault at %x, ip = %x, frame %x, esp = %x\n",
cr2, image->eip, page_get(cr2), image->esp);
debug_panic("page fault exception");
}
if (cr2 >= image->stack && cr2 < image->stack + SEGSZ) {
/* allocate stack */
mem_alloc(cr2 & ~0xFFF, PAGESZ, PF_PRES | PF_RW | PF_USER);
return image;
}
else {
/* fault */
debug_printf("%d: %s: page fault at %x, ip = %x, frame %x\n",
image->proc->pid, image->proc->name, cr2, image->eip, page_get(cr2));
debug_printf("user stack: %x - %x\n", image->stack, image->stack + SEGSZ);
debug_printf("user stack dump: (ebp = %x)\n", image->ebp);
debug_dumpi((void*) image->useresp, 30);
process_freeze(image->proc);
return thread_send(image, image->proc->pid, PORT_PAGE, NULL);
}
}
void
TRAP_pfault(interrupt_frame f)
{
vm_trap_frame_t vtf;
// vm_disable_paging();
vtf.fault_addr = cpu_get_cr2();
vtf.reason = (f.f_errno & PFE_PRESENT)?
VM_PFAULT_NO_PERMISSION
: VM_PFAULT_NO_PRESENT;
vtf.in_kernel = !(f.f_errno & PFE_US);
vtf.operation = (f.f_errno & PFE_WR)? VM_WRITE : VM_READ;
vtf.preempted_addr = f.f_eip;
kprintf("CIPL: %i\n", CIPL);
vm_trap_pfault(&vtf);
}
void fault_page(struct thread *image) {
uint32_t cr2;
/* Get faulting address from register CR2 */
cr2 = cpu_get_cr2();
/* If in kernelspace, panic */
if ((image->cs & 0x3) == 0) { /* i.e. if it was kernelmode */
debug_printf("page fault at %x, ip = %x, frame %x, esp = %x\n",
cr2, image->eip, page_get(cr2), image->esp);
debug_panic("page fault exception");
}
/* fault */
thread_save(image);
image->fault_addr = cr2;
image->fault = FV_PAGE;
image->state = TS_PAUSED;
// add to fault queue
fault_push(image);
}
