summaryrefslogtreecommitdiffstats
path: root/arch/m32r/mm/fault-nommu.c
blob: e22d5ddae5cbf35c885561d3d4bda96973e3fa9b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/*
 *  linux/arch/m32r/mm/fault.c
 *
 *  Copyright (c) 2001, 2002  Hitoshi Yamamoto, and H. Kondo
 *
 *  Some code taken from i386 version.
 *    Copyright (C) 1995  Linus Torvalds
 */

#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/interrupt.h>
#include <linux/init.h>
#include <linux/vt_kern.h>              /* For unblank_screen() */

#include <asm/m32r.h>
#include <linux/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/hardirq.h>
#include <asm/mmu_context.h>

extern void die(const char *, struct pt_regs *, long);

#ifndef CONFIG_SMP
asmlinkage unsigned int tlb_entry_i_dat;
asmlinkage unsigned int tlb_entry_d_dat;
#define tlb_entry_i tlb_entry_i_dat
#define tlb_entry_d tlb_entry_d_dat
#else
unsigned int tlb_entry_i_dat[NR_CPUS];
unsigned int tlb_entry_d_dat[NR_CPUS];
#define tlb_entry_i tlb_entry_i_dat[smp_processor_id()]
#define tlb_entry_d tlb_entry_d_dat[smp_processor_id()]
#endif

void do_BUG(const char *file, int line)
{
	bust_spinlocks(1);
	printk("kernel BUG at %s:%d!\n", file, line);
}

/*======================================================================*
 * do_page_fault()
 *======================================================================*
 * This routine handles page faults.  It determines the address,
 * and the problem, and then passes it off to one of the appropriate
 * routines.
 *
 * ARGUMENT:
 *  regs       : M32R SP reg.
 *  error_code : See below
 *  address    : M32R MMU MDEVA reg. (Operand ACE)
 *             : M32R BPC reg. (Instruction ACE)
 *
 * error_code :
 *  bit 0 == 0 means no page found, 1 means protection fault
 *  bit 1 == 0 means read, 1 means write
 *  bit 2 == 0 means kernel, 1 means user-mode
 *======================================================================*/
asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
  unsigned long address)
{

/*
 * Oops. The kernel tried to access some bad page. We'll have to
 * terminate things with extreme prejudice.
 */

	bust_spinlocks(1);

	if (address < PAGE_SIZE)
		printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
	else
		printk(KERN_ALERT "Unable to handle kernel paging request");
	printk(" at virtual address %08lx\n",address);
	printk(" printing bpc:\n");
	printk(KERN_ALERT "bpc = %08lx\n", regs->bpc);

	die("Oops", regs, error_code);
	bust_spinlocks(0);
	do_exit(SIGKILL);
}

/*======================================================================*
 * update_mmu_cache()
 *======================================================================*/
void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
	pte_t *ptep)
{
	BUG();
}

/*======================================================================*
 * flush_tlb_page() : flushes one page
 *======================================================================*/
void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
	BUG();
}

/*======================================================================*
 * flush_tlb_range() : flushes a range of pages
 *======================================================================*/
void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
	unsigned long end)
{
	BUG();
}

/*======================================================================*
 * flush_tlb_mm() : flushes the specified mm context TLB's
 *======================================================================*/
void local_flush_tlb_mm(struct mm_struct *mm)
{
	BUG();
}

/*======================================================================*
 * flush_tlb_all() : flushes all processes TLBs
 *======================================================================*/
void local_flush_tlb_all(void)
{
	BUG();
}
OpenPOWER on IntegriCloud