-/* $Id: fault.c,v 1.14 2004/01/13 05:52:11 kkojima Exp $
+/*
+ * Page fault handler for SH with an MMU.
*
- * linux/arch/sh/mm/fault.c
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2003 Paul Mundt
*
* Based on linux/arch/i386/mm/fault.c:
* Copyright (C) 1995 Linus Torvalds
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
*/
-
-#include <linux/signal.h>
-#include <linux/sched.h>
#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/smp_lock.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-
+#include <linux/hardirq.h>
+#include <linux/kprobes.h>
#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
-#include <asm/cacheflush.h>
#include <asm/kgdb.h>
extern void die(const char *,struct pt_regs *,long);
* and the problem, and then passes it off to one of the appropriate
* routines.
*/
-asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
- unsigned long address)
+asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
+ unsigned long writeaccess,
+ unsigned long address)
{
struct task_struct *tsk;
struct mm_struct *mm;
struct vm_area_struct * vma;
unsigned long page;
+ int si_code;
+ siginfo_t info;
+
+ trace_hardirqs_on();
+ local_irq_enable();
#ifdef CONFIG_SH_KGDB
if (kgdb_nofault && kgdb_bus_err_hook)
tsk = current;
mm = tsk->mm;
+ si_code = SEGV_MAPERR;
+
+ if (unlikely(address >= TASK_SIZE)) {
+ /*
+ * Synchronize this task's top level page-table
+ * with the 'reference' page table.
+ *
+ * Do _not_ use "tsk" here. We might be inside
+ * an interrupt in the middle of a task switch..
+ */
+ int offset = pgd_index(address);
+ pgd_t *pgd, *pgd_k;
+ pud_t *pud, *pud_k;
+ pmd_t *pmd, *pmd_k;
+
+ 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;
+ set_pgd(pgd, *pgd_k);
+ return;
+ }
+
+ 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);
+
+ pmd = pmd_offset(pud, address);
+ pmd_k = pmd_offset(pud_k, address);
+ if (pmd_present(*pmd) || !pmd_present(*pmd_k))
+ goto bad_area_nosemaphore;
+ set_pmd(pmd, *pmd_k);
+
+ return;
+ }
/*
* If we're in an interrupt or have no user
* we can handle it..
*/
good_area:
+ si_code = SEGV_ACCERR;
if (writeaccess) {
if (!(vma->vm_flags & VM_WRITE))
goto bad_area;
} else {
- if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+ if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
goto bad_area;
}
bad_area:
up_read(&mm->mmap_sem);
+bad_area_nosemaphore:
if (user_mode(regs)) {
- tsk->thread.address = address;
- tsk->thread.error_code = writeaccess;
- force_sig(SIGSEGV, tsk);
+ info.si_signo = SIGSEGV;
+ info.si_errno = 0;
+ info.si_code = si_code;
+ info.si_addr = (void *) address;
+ force_sig_info(SIGSEGV, &info, tsk);
return;
}
printk(KERN_ALERT "Unable to handle kernel paging request");
printk(" at virtual address %08lx\n", address);
printk(KERN_ALERT "pc = %08lx\n", regs->pc);
- asm volatile("mov.l %1, %0"
- : "=r" (page)
- : "m" (__m(MMU_TTB)));
+ page = (unsigned long)get_TTB();
if (page) {
- page = ((unsigned long *) page)[address >> 22];
+ page = ((unsigned long *) page)[address >> PGDIR_SHIFT];
printk(KERN_ALERT "*pde = %08lx\n", page);
if (page & _PAGE_PRESENT) {
page &= PAGE_MASK;
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (current->pid == 1) {
+ if (is_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
* Send a sigbus, regardless of whether we were in kernel
* or user mode.
*/
- tsk->thread.address = address;
- tsk->thread.error_code = writeaccess;
- tsk->thread.trap_no = 14;
- force_sig(SIGBUS, tsk);
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_ADRERR;
+ info.si_addr = (void *)address;
+ force_sig_info(SIGBUS, &info, tsk);
/* Kernel mode? Handle exceptions or die */
if (!user_mode(regs))
goto no_context;
}
-
-/*
- * Called with interrupt disabled.
- */
-asmlinkage int __do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
- unsigned long address)
-{
- unsigned long addrmax = P4SEG;
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- pte_t entry;
- struct mm_struct *mm;
- spinlock_t *ptl;
- int ret = 1;
-
-#ifdef CONFIG_SH_KGDB
- if (kgdb_nofault && kgdb_bus_err_hook)
- kgdb_bus_err_hook();
-#endif
-
-#ifdef CONFIG_SH_STORE_QUEUES
- addrmax = P4SEG_STORE_QUE + 0x04000000;
-#endif
-
- if (address >= P3SEG && address < addrmax) {
- pgd = pgd_offset_k(address);
- mm = NULL;
- } else if (address >= TASK_SIZE)
- return 1;
- else if (!(mm = current->mm))
- return 1;
- else
- pgd = pgd_offset(mm, address);
-
- pmd = pmd_offset(pgd, address);
- if (pmd_none_or_clear_bad(pmd))
- return 1;
- if (mm)
- pte = pte_offset_map_lock(mm, pmd, address, &ptl);
- else
- pte = pte_offset_kernel(pmd, address);
-
- entry = *pte;
- if (pte_none(entry) || pte_not_present(entry)
- || (writeaccess && !pte_write(entry)))
- goto unlock;
-
- if (writeaccess)
- entry = pte_mkdirty(entry);
- entry = pte_mkyoung(entry);
-
-#ifdef CONFIG_CPU_SH4
- /*
- * ITLB is not affected by "ldtlb" instruction.
- * So, we need to flush the entry by ourselves.
- */
-
- {
- unsigned long flags;
- local_irq_save(flags);
- __flush_tlb_page(get_asid(), address&PAGE_MASK);
- local_irq_restore(flags);
- }
-#endif
-
- set_pte(pte, entry);
- update_mmu_cache(NULL, address, entry);
- ret = 0;
-unlock:
- if (mm)
- pte_unmap_unlock(pte, ptl);
- return ret;
-}
-
-void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
- if (vma->vm_mm && vma->vm_mm->context != NO_CONTEXT) {
- unsigned long flags;
- unsigned long asid;
- unsigned long saved_asid = MMU_NO_ASID;
-
- asid = vma->vm_mm->context & MMU_CONTEXT_ASID_MASK;
- page &= PAGE_MASK;
-
- local_irq_save(flags);
- if (vma->vm_mm != current->mm) {
- saved_asid = get_asid();
- set_asid(asid);
- }
- __flush_tlb_page(asid, page);
- if (saved_asid != MMU_NO_ASID)
- set_asid(saved_asid);
- local_irq_restore(flags);
- }
-}
-
-void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
- unsigned long end)
-{
- struct mm_struct *mm = vma->vm_mm;
-
- if (mm->context != NO_CONTEXT) {
- unsigned long flags;
- int size;
-
- local_irq_save(flags);
- size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
- if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
- mm->context = NO_CONTEXT;
- if (mm == current->mm)
- activate_context(mm);
- } else {
- unsigned long asid = mm->context&MMU_CONTEXT_ASID_MASK;
- unsigned long saved_asid = MMU_NO_ASID;
-
- start &= PAGE_MASK;
- end += (PAGE_SIZE - 1);
- end &= PAGE_MASK;
- if (mm != current->mm) {
- saved_asid = get_asid();
- set_asid(asid);
- }
- while (start < end) {
- __flush_tlb_page(asid, start);
- start += PAGE_SIZE;
- }
- if (saved_asid != MMU_NO_ASID)
- set_asid(saved_asid);
- }
- local_irq_restore(flags);
- }
-}
-
-void flush_tlb_kernel_range(unsigned long start, unsigned long end)
-{
- unsigned long flags;
- int size;
-
- local_irq_save(flags);
- size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
- if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
- flush_tlb_all();
- } else {
- unsigned long asid = init_mm.context&MMU_CONTEXT_ASID_MASK;
- unsigned long saved_asid = get_asid();
-
- start &= PAGE_MASK;
- end += (PAGE_SIZE - 1);
- end &= PAGE_MASK;
- set_asid(asid);
- while (start < end) {
- __flush_tlb_page(asid, start);
- start += PAGE_SIZE;
- }
- set_asid(saved_asid);
- }
- local_irq_restore(flags);
-}
-
-void flush_tlb_mm(struct mm_struct *mm)
-{
- /* Invalidate all TLB of this process. */
- /* Instead of invalidating each TLB, we get new MMU context. */
- if (mm->context != NO_CONTEXT) {
- unsigned long flags;
-
- local_irq_save(flags);
- mm->context = NO_CONTEXT;
- if (mm == current->mm)
- activate_context(mm);
- local_irq_restore(flags);
- }
-}
-
-void flush_tlb_all(void)
-{
- unsigned long flags, status;
-
- /*
- * Flush all the TLB.
- *
- * Write to the MMU control register's bit:
- * TF-bit for SH-3, TI-bit for SH-4.
- * It's same position, bit #2.
- */
- local_irq_save(flags);
- status = ctrl_inl(MMUCR);
- status |= 0x04;
- ctrl_outl(status, MMUCR);
- local_irq_restore(flags);
-}
git.openpandora.org / pandora-kernel.git / blobdiff