* Page fault handler for SH with an MMU.
*
* Copyright (C) 1999 Niibe Yutaka
- * Copyright (C) 2003 - 2007 Paul Mundt
+ * Copyright (C) 2003 - 2008 Paul Mundt
*
* Based on linux/arch/i386/mm/fault.c:
* Copyright (C) 1995 Linus Torvalds
#include <linux/mm.h>
#include <linux/hardirq.h>
#include <linux/kprobes.h>
+#include <asm/io_trapped.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include <asm/kgdb.h>
+static inline int notify_page_fault(struct pt_regs *regs, int trap)
+{
+ int ret = 0;
+
+#ifdef CONFIG_KPROBES
+ if (!user_mode(regs)) {
+ preempt_disable();
+ if (kprobe_running() && kprobe_fault_handler(regs, trap))
+ ret = 1;
+ preempt_enable();
+ }
+#endif
+
+ return ret;
+}
+
/*
* This routine handles page faults. It determines the address,
* and the problem, and then passes it off to one of the appropriate
int fault;
siginfo_t info;
- trace_hardirqs_on();
- local_irq_enable();
+ if (notify_page_fault(regs, lookup_exception_vector()))
+ return;
#ifdef CONFIG_SH_KGDB
if (kgdb_nofault && kgdb_bus_err_hook)
#endif
tsk = current;
- mm = tsk->mm;
si_code = SEGV_MAPERR;
if (unlikely(address >= TASK_SIZE)) {
pgd = get_TTB() + offset;
pgd_k = swapper_pg_dir + offset;
- /* This will never happen with the folded page table. */
if (!pgd_present(*pgd)) {
if (!pgd_present(*pgd_k))
goto bad_area_nosemaphore;
pud = pud_offset(pgd, address);
pud_k = pud_offset(pgd_k, address);
- if (pud_present(*pud) || !pud_present(*pud_k))
- goto bad_area_nosemaphore;
- set_pud(pud, *pud_k);
+
+ if (!pud_present(*pud)) {
+ if (!pud_present(*pud_k))
+ goto bad_area_nosemaphore;
+ set_pud(pud, *pud_k);
+ return;
+ }
pmd = pmd_offset(pud, address);
pmd_k = pmd_offset(pud_k, address);
return;
}
+ /* Only enable interrupts if they were on before the fault */
+ if ((regs->sr & SR_IMASK) != SR_IMASK) {
+ trace_hardirqs_on();
+ local_irq_enable();
+ }
+
+ mm = tsk->mm;
+
/*
* If we're in an interrupt or have no user
* context, we must not take the fault..
if (fixup_exception(regs))
return;
+ if (handle_trapped_io(regs, address))
+ return;
/*
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
pte_t *pte;
pte_t entry;
+ if (notify_page_fault(regs, lookup_exception_vector()))
+ return 0;
+
#ifdef CONFIG_SH_KGDB
if (kgdb_nofault && kgdb_bus_err_hook)
kgdb_bus_err_hook();
entry = pte_mkdirty(entry);
entry = pte_mkyoung(entry);
+#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SMP)
+ /*
+ * ITLB is not affected by "ldtlb" instruction.
+ * So, we need to flush the entry by ourselves.
+ */
+ local_flush_tlb_one(get_asid(), address & PAGE_MASK);
+#endif
+
set_pte(pte, entry);
update_mmu_cache(NULL, address, entry);