LXR linux/arch/m32r/mm/fault-nommu.c

   1/*
   2 *  linux/arch/m32r/mm/fault.c
   3 *
   4 *  Copyright (c) 2001, 2002  Hitoshi Yamamoto, and H. Kondo
   5 *
   6 *  Some code taken from i386 version.
   7 *    Copyright (C) 1995  Linus Torvalds
   8 */
   9
  10#include <linux/signal.h>
  11#include <linux/sched.h>
  12#include <linux/kernel.h>
  13#include <linux/errno.h>
  14#include <linux/string.h>
  15#include <linux/types.h>
  16#include <linux/ptrace.h>
  17#include <linux/mman.h>
  18#include <linux/mm.h>
  19#include <linux/smp.h>
  20#include <linux/interrupt.h>
  21#include <linux/init.h>
  22#include <linux/vt_kern.h>              /* For unblank_screen() */
  23
  24#include <asm/m32r.h>
  25#include <asm/uaccess.h>
  26#include <asm/pgalloc.h>
  27#include <asm/pgtable.h>
  28#include <asm/hardirq.h>
  29#include <asm/mmu_context.h>
  30
  31extern void die(const char *, struct pt_regs *, long);
  32
  33#ifndef CONFIG_SMP
  34asmlinkage unsigned int tlb_entry_i_dat;
  35asmlinkage unsigned int tlb_entry_d_dat;
  36#define tlb_entry_i tlb_entry_i_dat
  37#define tlb_entry_d tlb_entry_d_dat
  38#else
  39unsigned int tlb_entry_i_dat[NR_CPUS];
  40unsigned int tlb_entry_d_dat[NR_CPUS];
  41#define tlb_entry_i tlb_entry_i_dat[smp_processor_id()]
  42#define tlb_entry_d tlb_entry_d_dat[smp_processor_id()]
  43#endif
  44
  45void do_BUG(const char *file, int line)
  46{
  47        bust_spinlocks(1);
  48        printk("kernel BUG at %s:%d!\n", file, line);
  49}
  50
  51/*======================================================================*
  52 * do_page_fault()
  53 *======================================================================*
  54 * This routine handles page faults.  It determines the address,
  55 * and the problem, and then passes it off to one of the appropriate
  56 * routines.
  57 *
  58 * ARGUMENT:
  59 *  regs       : M32R SP reg.
  60 *  error_code : See below
  61 *  address    : M32R MMU MDEVA reg. (Operand ACE)
  62 *             : M32R BPC reg. (Instruction ACE)
  63 *
  64 * error_code :
  65 *  bit 0 == 0 means no page found, 1 means protection fault
  66 *  bit 1 == 0 means read, 1 means write
  67 *  bit 2 == 0 means kernel, 1 means user-mode
  68 *======================================================================*/
  69asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
  70  unsigned long address)
  71{
  72
  73/*
  74 * Oops. The kernel tried to access some bad page. We'll have to
  75 * terminate things with extreme prejudice.
  76 */
  77
  78        bust_spinlocks(1);
  79
  80        if (address < PAGE_SIZE)
  81                printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
  82        else
  83                printk(KERN_ALERT "Unable to handle kernel paging request");
  84        printk(" at virtual address %08lx\n",address);
  85        printk(" printing bpc:\n");
  86        printk(KERN_ALERT "bpc = %08lx\n", regs->bpc);
  87
  88        die("Oops", regs, error_code);
  89        bust_spinlocks(0);
  90        do_exit(SIGKILL);
  91}
  92
  93/*======================================================================*
  94 * update_mmu_cache()
  95 *======================================================================*/
  96void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
  97        pte_t *ptep)
  98{
  99        BUG();
 100}
 101
 102/*======================================================================*
 103 * flush_tlb_page() : flushes one page
 104 *======================================================================*/
 105void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 106{
 107        BUG();
 108}
 109
 110/*======================================================================*
 111 * flush_tlb_range() : flushes a range of pages
 112 *======================================================================*/
 113void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 114        unsigned long end)
 115{
 116        BUG();
 117}
 118
 119/*======================================================================*
 120 * flush_tlb_mm() : flushes the specified mm context TLB's
 121 *======================================================================*/
 122void local_flush_tlb_mm(struct mm_struct *mm)
 123{
 124        BUG();
 125}
 126
 127/*======================================================================*
 128 * flush_tlb_all() : flushes all processes TLBs
 129 *======================================================================*/
 130void local_flush_tlb_all(void)
 131{
 132        BUG();
 133}
 134