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/smp_lock.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/init.h>
  23 #include <linux/vt_kern.h>              /* For unblank_screen() */
  24
  25 #include <asm/m32r.h>
  26 #include <asm/system.h>
  27 #include <asm/uaccess.h>
  28 #include <asm/pgalloc.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/hardirq.h>
  31 #include <asm/mmu_context.h>
  32
  33 extern void die(const char *, struct pt_regs *, long);
  34
  35 #ifndef CONFIG_SMP
  36 asmlinkage unsigned int tlb_entry_i_dat;
  37 asmlinkage unsigned int tlb_entry_d_dat;
  38 #define tlb_entry_i tlb_entry_i_dat
  39 #define tlb_entry_d tlb_entry_d_dat
  40 #else
  41 unsigned int tlb_entry_i_dat[NR_CPUS];
  42 unsigned int tlb_entry_d_dat[NR_CPUS];
  43 #define tlb_entry_i tlb_entry_i_dat[smp_processor_id()]
  44 #define tlb_entry_d tlb_entry_d_dat[smp_processor_id()]
  45 #endif
  46
  47 void do_BUG(const char *file, int line)
  48 {
  49         bust_spinlocks(1);
  50         printk("kernel BUG at %s:%d!\n", file, line);
  51 }
  52
  53 /*======================================================================*
  54  * do_page_fault()
  55  *======================================================================*
  56  * This routine handles page faults.  It determines the address,
  57  * and the problem, and then passes it off to one of the appropriate
  58  * routines.
  59  *
  60  * ARGUMENT:
  61  *  regs       : M32R SP reg.
  62  *  error_code : See below
  63  *  address    : M32R MMU MDEVA reg. (Operand ACE)
  64  *             : M32R BPC reg. (Instruction ACE)
  65  *
  66  * error_code :
  67  *  bit 0 == 0 means no page found, 1 means protection fault
  68  *  bit 1 == 0 means read, 1 means write
  69  *  bit 2 == 0 means kernel, 1 means user-mode
  70  *======================================================================*/
  71 asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
  72   unsigned long address)
  73 {
  74
  75 /*
  76  * Oops. The kernel tried to access some bad page. We'll have to
  77  * terminate things with extreme prejudice.
  78  */
  79
  80         bust_spinlocks(1);
  81
  82         if (address < PAGE_SIZE)
  83                 printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
  84         else
  85                 printk(KERN_ALERT "Unable to handle kernel paging request");
  86         printk(" at virtual address %08lx\n",address);
  87         printk(" printing bpc:\n");
  88         printk(KERN_ALERT "bpc = %08lx\n", regs->bpc);
  89
  90         die("Oops", regs, error_code);
  91         bust_spinlocks(0);
  92         do_exit(SIGKILL);
  93 }
  94
  95 /*======================================================================*
  96  * update_mmu_cache()
  97  *======================================================================*/
  98 void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
  99         pte_t pte)
 100 {
 101         BUG();
 102 }
 103
 104 /*======================================================================*
 105  * flush_tlb_page() : flushes one page
 106  *======================================================================*/
 107 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 108 {
 109         BUG();
 110 }
 111
 112 /*======================================================================*
 113  * flush_tlb_range() : flushes a range of pages
 114  *======================================================================*/
 115 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 116         unsigned long end)
 117 {
 118         BUG();
 119 }
 120
 121 /*======================================================================*
 122  * flush_tlb_mm() : flushes the specified mm context TLB's
 123  *======================================================================*/
 124 void local_flush_tlb_mm(struct mm_struct *mm)
 125 {
 126         BUG();
 127 }
 128
 129 /*======================================================================*
 130  * flush_tlb_all() : flushes all processes TLBs
 131  *======================================================================*/
 132 void local_flush_tlb_all(void)
 133 {
 134         BUG();
 135 }