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Code: Select all

orig_eax dw 0
retaddr dw 0
errcode dw 0

global page_fault

page_fault:
  mov dword [orig_eax],eax
  pop eax
  mov dword [errcode],eax
  mov [ready_esp],esp
  pop eax
  mov dword [retaddr],eax
  push eax
  mov eax, dword [orig_eax]
  pusha
  mov eax, dword [errcode]
  push eax
  mov eax, dword [retaddr]
  push eax
  call exception_page_fault
  popa
  iret

Code: Select all

uint32_t address;

void exception_page_fault(uint32_t retaddr, uint32_t error) {
	disable_tasking();
	asm volatile("mov %%cr2, %0":"=a"(address):);
	if(error&4) {
		kerror("[Exception.Fault] Usermode Page Privelage Fault!");
		// ... bunch of printfs that print out the error code, fault address, and page permissions removed
		exit_program(1);
		// Should not reach here.
		for(;;);
		return;
	} else {
		terminal_setcolor(0x1F);
		terminal_refresh();
		kerror("[Exception.Fault] Kernel Page Fault!");
		// ... bunch of printfs that print out the error code, fault address, and page permissions removed
		abort();
		for(;;);
	}
}