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