1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/m32r/mm/fault.c
4 *
5 * Copyright (c) 2001, 2002 Hitoshi Yamamoto, and H. Kondo
6 *
7 * Some code taken from i386 version.
8 * Copyright (C) 1995 Linus Torvalds
9 */
10
11 #include <linux/signal.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/types.h>
17 #include <linux/ptrace.h>
18 #include <linux/mman.h>
19 #include <linux/mm.h>
20 #include <linux/smp.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 <linux/uaccess.h>
27 #include <asm/pgalloc.h>
28 #include <asm/pgtable.h>
29 #include <asm/hardirq.h>
30 #include <asm/mmu_context.h>
31
32 extern void die(const char *, struct pt_regs *, long);
33
34 #ifndef CONFIG_SMP
35 asmlinkage unsigned int tlb_entry_i_dat;
36 asmlinkage 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
40 unsigned int tlb_entry_i_dat[NR_CPUS];
41 unsigned 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
do_BUG(const char * file,int line)46 void 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 *======================================================================*/
do_page_fault(struct pt_regs * regs,unsigned long error_code,unsigned long address)70 asmlinkage 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 *======================================================================*/
update_mmu_cache(struct vm_area_struct * vma,unsigned long addr,pte_t * ptep)97 void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
98 pte_t *ptep)
99 {
100 BUG();
101 }
102
103 /*======================================================================*
104 * flush_tlb_page() : flushes one page
105 *======================================================================*/
local_flush_tlb_page(struct vm_area_struct * vma,unsigned long page)106 void 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 *======================================================================*/
local_flush_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)114 void 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 *======================================================================*/
local_flush_tlb_mm(struct mm_struct * mm)123 void local_flush_tlb_mm(struct mm_struct *mm)
124 {
125 BUG();
126 }
127
128 /*======================================================================*
129 * flush_tlb_all() : flushes all processes TLBs
130 *======================================================================*/
local_flush_tlb_all(void)131 void local_flush_tlb_all(void)
132 {
133 BUG();
134 }
135