summaryrefslogtreecommitdiff
path: root/arch/arc/mm/fault.c
blob: 318164cabdfc5e72c771d5f686aad2da49e63d8f (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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/* Page Fault Handling for ARC (TLB Miss / ProtV)
 *
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/signal.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/uaccess.h>
#include <linux/kdebug.h>
#include <asm/pgalloc.h>
#include <asm/mmu.h>

static int handle_vmalloc_fault(struct mm_struct *mm, unsigned long address)
{
	/*
	 * Synchronize this task's top level page-table
	 * with the 'reference' page table.
	 */
	pgd_t *pgd, *pgd_k;
	pud_t *pud, *pud_k;
	pmd_t *pmd, *pmd_k;

	pgd = pgd_offset_fast(mm, address);
	pgd_k = pgd_offset_k(address);

	if (!pgd_present(*pgd_k))
		goto bad_area;

	pud = pud_offset(pgd, address);
	pud_k = pud_offset(pgd_k, address);
	if (!pud_present(*pud_k))
		goto bad_area;

	pmd = pmd_offset(pud, address);
	pmd_k = pmd_offset(pud_k, address);
	if (!pmd_present(*pmd_k))
		goto bad_area;

	set_pmd(pmd, *pmd_k);

	/* XXX: create the TLB entry here */
	return 0;

bad_area:
	return 1;
}

void do_page_fault(struct pt_regs *regs, unsigned long address)
{
	struct vm_area_struct *vma = NULL;
	struct task_struct *tsk = current;
	struct mm_struct *mm = tsk->mm;
	siginfo_t info;
	int fault, ret;
	int write = regs->ecr_cause & ECR_C_PROTV_STORE;  /* ST/EX */
	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
				(write ? FAULT_FLAG_WRITE : 0);

	/*
	 * We fault-in kernel-space virtual memory on-demand. The
	 * 'reference' page table is init_mm.pgd.
	 *
	 * NOTE! We MUST NOT take any locks for this case. We may
	 * be in an interrupt or a critical region, and should
	 * only copy the information from the master page table,
	 * nothing more.
	 */
	if (address >= VMALLOC_START && address <= VMALLOC_END) {
		ret = handle_vmalloc_fault(mm, address);
		if (unlikely(ret))
			goto bad_area_nosemaphore;
		else
			return;
	}

	info.si_code = SEGV_MAPERR;

	/*
	 * If we're in an interrupt or have no user
	 * context, we must not take the fault..
	 */
	if (in_atomic() || !mm)
		goto no_context;

retry:
	down_read(&mm->mmap_sem);
	vma = find_vma(mm, address);
	if (!vma)
		goto bad_area;
	if (vma->vm_start <= address)
		goto good_area;
	if (!(vma->vm_flags & VM_GROWSDOWN))
		goto bad_area;
	if (expand_stack(vma, address))
		goto bad_area;

	/*
	 * Ok, we have a good vm_area for this memory access, so
	 * we can handle it..
	 */
good_area:
	info.si_code = SEGV_ACCERR;

	/* Handle protection violation, execute on heap or stack */

	if ((regs->ecr_vec == ECR_V_PROTV) &&
	    (regs->ecr_cause == ECR_C_PROTV_INST_FETCH))
		goto bad_area;

	if (write) {
		if (!(vma->vm_flags & VM_WRITE))
			goto bad_area;
	} else {
		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
			goto bad_area;
	}

survive:
	/*
	 * If for any reason at all we couldn't handle the fault,
	 * make sure we exit gracefully rather than endlessly redo
	 * the fault.
	 */
	fault = handle_mm_fault(mm, vma, address, flags);

	/* If Pagefault was interrupted by SIGKILL, exit page fault "early" */
	if (unlikely(fatal_signal_pending(current))) {
		if ((fault & VM_FAULT_ERROR) && !(fault & VM_FAULT_RETRY))
			up_read(&mm->mmap_sem);
		if (user_mode(regs))
			return;
	}

	if (likely(!(fault & VM_FAULT_ERROR))) {
		if (flags & FAULT_FLAG_ALLOW_RETRY) {
			/* To avoid updating stats twice for retry case */
			if (fault & VM_FAULT_MAJOR)
				tsk->maj_flt++;
			else
				tsk->min_flt++;

			if (fault & VM_FAULT_RETRY) {
				flags &= ~FAULT_FLAG_ALLOW_RETRY;
				flags |= FAULT_FLAG_TRIED;
				goto retry;
			}
		}

		/* Fault Handled Gracefully */
		up_read(&mm->mmap_sem);
		return;
	}

	/* TBD: switch to pagefault_out_of_memory() */
	if (fault & VM_FAULT_OOM)
		goto out_of_memory;
	else if (fault & VM_FAULT_SIGBUS)
		goto do_sigbus;

	/* no man's land */
	BUG();

	/*
	 * Something tried to access memory that isn't in our memory map..
	 * Fix it, but check if it's kernel or user first..
	 */
bad_area:
	up_read(&mm->mmap_sem);

bad_area_nosemaphore:
	/* User mode accesses just cause a SIGSEGV */
	if (user_mode(regs)) {
		tsk->thread.fault_address = address;
		info.si_signo = SIGSEGV;
		info.si_errno = 0;
		/* info.si_code has been set above */
		info.si_addr = (void __user *)address;
		force_sig_info(SIGSEGV, &info, tsk);
		return;
	}

no_context:
	/* Are we prepared to handle this kernel fault?
	 *
	 * (The kernel has valid exception-points in the source
	 *  when it acesses user-memory. When it fails in one
	 *  of those points, we find it in a table and do a jump
	 *  to some fixup code that loads an appropriate error
	 *  code)
	 */
	if (fixup_exception(regs))
		return;

	die("Oops", regs, address);

out_of_memory:
	if (is_global_init(tsk)) {
		yield();
		goto survive;
	}
	up_read(&mm->mmap_sem);

	if (user_mode(regs))
		do_group_exit(SIGKILL);	/* This will never return */

	goto no_context;

do_sigbus:
	up_read(&mm->mmap_sem);

	if (!user_mode(regs))
		goto no_context;

	tsk->thread.fault_address = address;
	info.si_signo = SIGBUS;
	info.si_errno = 0;
	info.si_code = BUS_ADRERR;
	info.si_addr = (void __user *)address;
	force_sig_info(SIGBUS, &info, tsk);
}