fault.c (d585a021c0b10b0477d6b608c53e1feb8cde0507) fault.c (f4dbfa8f3131a84257223393905f7efad0ca5996)
1/*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Derived from "arch/i386/mm/fault.c"
6 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
7 *
8 * Modified by Cort Dougan and Paul Mackerras.

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24#include <linux/ptrace.h>
25#include <linux/mman.h>
26#include <linux/mm.h>
27#include <linux/interrupt.h>
28#include <linux/highmem.h>
29#include <linux/module.h>
30#include <linux/kprobes.h>
31#include <linux/kdebug.h>
1/*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Derived from "arch/i386/mm/fault.c"
6 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
7 *
8 * Modified by Cort Dougan and Paul Mackerras.

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24#include <linux/ptrace.h>
25#include <linux/mman.h>
26#include <linux/mm.h>
27#include <linux/interrupt.h>
28#include <linux/highmem.h>
29#include <linux/module.h>
30#include <linux/kprobes.h>
31#include <linux/kdebug.h>
32#include <linux/perf_counter.h>
32
33#include <asm/firmware.h>
34#include <asm/page.h>
35#include <asm/pgtable.h>
36#include <asm/mmu.h>
37#include <asm/mmu_context.h>
38#include <asm/system.h>
39#include <asm/uaccess.h>

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165 as is current->mm == NULL. */
166 printk(KERN_EMERG "Page fault in user mode with "
167 "in_atomic() = %d mm = %p\n", in_atomic(), mm);
168 printk(KERN_EMERG "NIP = %lx MSR = %lx\n",
169 regs->nip, regs->msr);
170 die("Weird page fault", regs, SIGSEGV);
171 }
172
33
34#include <asm/firmware.h>
35#include <asm/page.h>
36#include <asm/pgtable.h>
37#include <asm/mmu.h>
38#include <asm/mmu_context.h>
39#include <asm/system.h>
40#include <asm/uaccess.h>

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166 as is current->mm == NULL. */
167 printk(KERN_EMERG "Page fault in user mode with "
168 "in_atomic() = %d mm = %p\n", in_atomic(), mm);
169 printk(KERN_EMERG "NIP = %lx MSR = %lx\n",
170 regs->nip, regs->msr);
171 die("Weird page fault", regs, SIGSEGV);
172 }
173
174 perf_swcounter_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
175
173 /* When running in the kernel we expect faults to occur only to
174 * addresses in user space. All other faults represent errors in the
175 * kernel and should generate an OOPS. Unfortunately, in the case of an
176 * erroneous fault occurring in a code path which already holds mmap_sem
177 * we will deadlock attempting to validate the fault against the
178 * address space. Luckily the kernel only validly references user
179 * space from well defined areas of code, which are listed in the
180 * exceptions table.

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304 if (ret & VM_FAULT_OOM)
305 goto out_of_memory;
306 else if (ret & VM_FAULT_SIGBUS)
307 goto do_sigbus;
308 BUG();
309 }
310 if (ret & VM_FAULT_MAJOR) {
311 current->maj_flt++;
176 /* When running in the kernel we expect faults to occur only to
177 * addresses in user space. All other faults represent errors in the
178 * kernel and should generate an OOPS. Unfortunately, in the case of an
179 * erroneous fault occurring in a code path which already holds mmap_sem
180 * we will deadlock attempting to validate the fault against the
181 * address space. Luckily the kernel only validly references user
182 * space from well defined areas of code, which are listed in the
183 * exceptions table.

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307 if (ret & VM_FAULT_OOM)
308 goto out_of_memory;
309 else if (ret & VM_FAULT_SIGBUS)
310 goto do_sigbus;
311 BUG();
312 }
313 if (ret & VM_FAULT_MAJOR) {
314 current->maj_flt++;
315 perf_swcounter_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0,
316 regs, address);
312#ifdef CONFIG_PPC_SMLPAR
313 if (firmware_has_feature(FW_FEATURE_CMO)) {
314 preempt_disable();
315 get_lppaca()->page_ins += (1 << PAGE_FACTOR);
316 preempt_enable();
317 }
318#endif
317#ifdef CONFIG_PPC_SMLPAR
318 if (firmware_has_feature(FW_FEATURE_CMO)) {
319 preempt_disable();
320 get_lppaca()->page_ins += (1 << PAGE_FACTOR);
321 preempt_enable();
322 }
323#endif
319 } else
324 } else {
320 current->min_flt++;
325 current->min_flt++;
326 perf_swcounter_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0,
327 regs, address);
328 }
321 up_read(&mm->mmap_sem);
322 return 0;
323
324bad_area:
325 up_read(&mm->mmap_sem);
326
327bad_area_nosemaphore:
328 /* User mode accesses cause a SIGSEGV */

--- 80 unchanged lines hidden --- 		329 up_read(&mm->mmap_sem);
330 return 0;
331
332bad_area:
333 up_read(&mm->mmap_sem);
334
335bad_area_nosemaphore:
336 /* User mode accesses cause a SIGSEGV */

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