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#include "arch/x86_64/idt.h"
#include "arch/processor.h"
#include "memory.h"
#include "print.h"
#include "jove.h"
#include <stdbool.h>
int_state_t*
_pagefault_handler(int_state_t *state)
{
extern uint64_t __isr_err;
uintptr_t fault_addr = 0;
__asm__ volatile("movq %%cr2, %0": "=r"(fault_addr));
if(fault_addr < USERLAND_MEMORY_LIMIT) {
// Check if there is an entry in the exception return table.
processor_t *proc = processor_current();
if(proc->ert_i > 0) {
state->ip = (uintptr_t)_exrtab_pop();
return state;
}
}
bool present = __isr_err & 1;
bool write = __isr_err & 2;
bool user = __isr_err & 4;
klogf("Page fault at %016X\n", fault_addr);
klogf("%s %s from a %s address\n",
user ? "user" : "kernel",
write ? "wrote" : "read",
present ? "present" : "non-present");
int_state_print(state);
kpanic("Unhandled page fault\n");
return state;
}
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