fault.c (3eb0f5193b497083391aa05d35210d5645211eef) fault.c (75bfb9a1c89ae1f28cd09f7ae0d236ebde9b97ec)
1/*
2 * OpenRISC fault.c
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * Modifications for the OpenRISC architecture:

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47 */
48
49asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
50 unsigned long vector, int write_acc)
51{
52 struct task_struct *tsk;
53 struct mm_struct *mm;
54 struct vm_area_struct *vma;
1/*
2 * OpenRISC fault.c
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * Modifications for the OpenRISC architecture:

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47 */
48
49asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
50 unsigned long vector, int write_acc)
51{
52 struct task_struct *tsk;
53 struct mm_struct *mm;
54 struct vm_area_struct *vma;
55 siginfo_t info;
55 int si_code;
56 int fault;
57 unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
58
56 int fault;
57 unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
58
59 clear_siginfo(&info);
60 tsk = current;
61
62 /*
63 * We fault-in kernel-space virtual memory on-demand. The
64 * 'reference' page table is init_mm.pgd.
65 *
66 * NOTE! We MUST NOT take any locks for this case. We may
67 * be in an interrupt or a critical region, and should

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93 * been enabled or disabled. If they were enabled,
94 * reenable them.
95 */
96 if (regs->sr && (SPR_SR_IEE | SPR_SR_TEE))
97 local_irq_enable();
98 }
99
100 mm = tsk->mm;
59 tsk = current;
60
61 /*
62 * We fault-in kernel-space virtual memory on-demand. The
63 * 'reference' page table is init_mm.pgd.
64 *
65 * NOTE! We MUST NOT take any locks for this case. We may
66 * be in an interrupt or a critical region, and should

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92 * been enabled or disabled. If they were enabled,
93 * reenable them.
94 */
95 if (regs->sr && (SPR_SR_IEE | SPR_SR_TEE))
96 local_irq_enable();
97 }
98
99 mm = tsk->mm;
101 info.si_code = SEGV_MAPERR;
100 si_code = SEGV_MAPERR;
102
103 /*
104 * If we're in an interrupt or have no user
105 * context, we must not take the fault..
106 */
107
108 if (in_interrupt() || !mm)
109 goto no_context;

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135 goto bad_area;
136
137 /*
138 * Ok, we have a good vm_area for this memory access, so
139 * we can handle it..
140 */
141
142good_area:
101
102 /*
103 * If we're in an interrupt or have no user
104 * context, we must not take the fault..
105 */
106
107 if (in_interrupt() || !mm)
108 goto no_context;

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134 goto bad_area;
135
136 /*
137 * Ok, we have a good vm_area for this memory access, so
138 * we can handle it..
139 */
140
141good_area:
143 info.si_code = SEGV_ACCERR;
142 si_code = SEGV_ACCERR;
144
145 /* first do some preliminary protection checks */
146
147 if (write_acc) {
148 if (!(vma->vm_flags & VM_WRITE))
149 goto bad_area;
150 flags |= FAULT_FLAG_WRITE;
151 } else {

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209bad_area:
210 up_read(&mm->mmap_sem);
211
212bad_area_nosemaphore:
213
214 /* User mode accesses just cause a SIGSEGV */
215
216 if (user_mode(regs)) {
143
144 /* first do some preliminary protection checks */
145
146 if (write_acc) {
147 if (!(vma->vm_flags & VM_WRITE))
148 goto bad_area;
149 flags |= FAULT_FLAG_WRITE;
150 } else {

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208bad_area:
209 up_read(&mm->mmap_sem);
210
211bad_area_nosemaphore:
212
213 /* User mode accesses just cause a SIGSEGV */
214
215 if (user_mode(regs)) {
217 info.si_signo = SIGSEGV;
218 info.si_errno = 0;
219 /* info.si_code has been set above */
220 info.si_addr = (void *)address;
221 force_sig_info(SIGSEGV, &info, tsk);
216 force_sig_fault(SIGSEGV, si_code, (void __user *)address, tsk);
222 return;
223 }
224
225no_context:
226
227 /* Are we prepared to handle this kernel fault?
228 *
229 * (The kernel has valid exception-points in the source

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278
279do_sigbus:
280 up_read(&mm->mmap_sem);
281
282 /*
283 * Send a sigbus, regardless of whether we were in kernel
284 * or user mode.
285 */
217 return;
218 }
219
220no_context:
221
222 /* Are we prepared to handle this kernel fault?
223 *
224 * (The kernel has valid exception-points in the source

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273
274do_sigbus:
275 up_read(&mm->mmap_sem);
276
277 /*
278 * Send a sigbus, regardless of whether we were in kernel
279 * or user mode.
280 */
286 info.si_signo = SIGBUS;
287 info.si_errno = 0;
288 info.si_code = BUS_ADRERR;
289 info.si_addr = (void *)address;
290 force_sig_info(SIGBUS, &info, tsk);
281 force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, tsk);
291
292 /* Kernel mode? Handle exceptions or die */
293 if (!user_mode(regs))
294 goto no_context;
295 return;
296
297vmalloc_fault:
298 {

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283 /* Kernel mode? Handle exceptions or die */
284 if (!user_mode(regs))
285 goto no_context;
286 return;
287
288vmalloc_fault:
289 {

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