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CRIS: Minor fixes to mm/fault.c
- Only disallow oops if we're in_interrupt context (was in_atomic before) - Use the generic oops_in_progress instead of the raw_printk hack. - Fix whitespace/formatting. - Remove CVS log entries.
This commit is contained in:
Jesper Nilsson
parent
75e52b279c
commit
3e1fdc4eac
@ -1,130 +1,9 @@
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/*
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* linux/arch/cris/mm/fault.c
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*
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* Copyright (C) 2000, 2001 Axis Communications AB
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*
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* Authors: Bjorn Wesen
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*
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* $Log: fault.c,v $
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* Revision 1.20 2005/03/04 08:16:18 starvik
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* Merge of Linux 2.6.11.
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*
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* Revision 1.19 2005/01/14 10:07:59 starvik
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* Fixed warning.
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*
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* Revision 1.18 2005/01/12 08:10:14 starvik
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* Re-added the change of frametype when handling kernel page fault fixup
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* for v10. This is necessary to avoid that the CPU remakes the faulting
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* access.
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*
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* Revision 1.17 2005/01/11 13:53:05 starvik
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* Use raw_printk.
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*
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* Revision 1.16 2004/12/17 11:39:41 starvik
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* SMP support.
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*
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* Revision 1.15 2004/11/23 18:36:18 starvik
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* Stack is now non-executable.
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* Signal handler trampolines are placed in a reserved page mapped into all
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* processes.
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*
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* Revision 1.14 2004/11/23 07:10:21 starvik
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* Moved find_fixup_code to generic code.
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*
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* Revision 1.13 2004/11/23 07:00:54 starvik
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* Actually use the execute permission bit in the MMU. This makes it possible
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* to prevent e.g. attacks where executable code is put on the stack.
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*
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* Revision 1.12 2004/09/29 06:16:04 starvik
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* Use instruction_pointer
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*
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* Revision 1.11 2004/05/14 07:58:05 starvik
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* Merge of changes from 2.4
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*
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* Revision 1.10 2003/10/27 14:51:24 starvik
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* Removed debugcode
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*
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* Revision 1.9 2003/10/27 14:50:42 starvik
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* Changed do_page_fault signature
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*
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* Revision 1.8 2003/07/04 13:02:48 tobiasa
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* Moved code snippet from arch/cris/mm/fault.c that searches for fixup code
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* to separate function in arch-specific files.
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*
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* Revision 1.7 2003/01/22 06:48:38 starvik
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* Fixed warnings issued by GCC 3.2.1
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*
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* Revision 1.6 2003/01/09 14:42:52 starvik
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* Merge of Linux 2.5.55
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*
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* Revision 1.5 2002/12/11 14:44:48 starvik
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* Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/mm
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*
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* Revision 1.4 2002/11/13 15:10:28 starvik
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* pte_offset has been renamed to pte_offset_kernel
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*
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* Revision 1.3 2002/11/05 06:45:13 starvik
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* Merge of Linux 2.5.45
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*
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* Revision 1.2 2001/12/18 13:35:22 bjornw
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* Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
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*
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* Revision 1.20 2001/11/22 13:34:06 bjornw
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* * Bug workaround (LX TR89): force a rerun of the whole of an interrupted
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* unaligned write, because the second half of the write will be corrupted
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* otherwise. Affected unaligned writes spanning not-yet mapped pages.
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* * Optimization: use the wr_rd bit in R_MMU_CAUSE to know whether a miss
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* was due to a read or a write (before we didn't know this until the next
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* restart of the interrupted instruction, thus wasting one fault-irq)
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*
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* Revision 1.19 2001/11/12 19:02:10 pkj
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* Fixed compiler warnings.
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*
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* Revision 1.18 2001/07/18 22:14:32 bjornw
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* Enable interrupts in the bulk of do_page_fault
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*
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* Revision 1.17 2001/07/18 13:07:23 bjornw
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* * Detect non-existant PTE's in vmalloc pmd synchronization
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* * Remove comment about fast-paths for VMALLOC_START etc, because all that
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* was totally bogus anyway it turned out :)
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* * Fix detection of vmalloc-area synchronization
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* * Add some comments
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*
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* Revision 1.16 2001/06/13 00:06:08 bjornw
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* current_pgd should be volatile
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*
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* Revision 1.15 2001/06/13 00:02:23 bjornw
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* Use a separate variable to store the current pgd to avoid races in schedule
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*
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* Revision 1.14 2001/05/16 17:41:07 hp
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* Last comment tweak further tweaked.
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*
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* Revision 1.13 2001/05/15 00:58:44 hp
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* Expand a bit on the comment why we compare address >= TASK_SIZE rather
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* than >= VMALLOC_START.
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*
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* Revision 1.12 2001/04/04 10:51:14 bjornw
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* mmap_sem is grabbed for reading
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*
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* Revision 1.11 2001/03/23 07:36:07 starvik
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* Corrected according to review remarks
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*
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* Revision 1.10 2001/03/21 16:10:11 bjornw
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* CRIS_FRAME_FIXUP not needed anymore, use FRAME_NORMAL
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*
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* Revision 1.9 2001/03/05 13:22:20 bjornw
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* Spell-fix and fix in vmalloc_fault handling
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*
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* Revision 1.8 2000/11/22 14:45:31 bjornw
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* * 2.4.0-test10 removed the set_pgdir instantaneous kernel global mapping
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* into all processes. Instead we fill in the missing PTE entries on demand.
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*
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* Revision 1.7 2000/11/21 16:39:09 bjornw
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* fixup switches frametype
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*
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* Revision 1.6 2000/11/17 16:54:08 bjornw
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* More detailed siginfo reporting
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* Copyright (C) 2000-2006 Axis Communications AB
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*
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* Authors: Bjorn Wesen
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*
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*/
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@ -135,7 +14,6 @@
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extern int find_fixup_code(struct pt_regs *);
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extern void die_if_kernel(const char *, struct pt_regs *, long);
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extern int raw_printk(const char *fmt, ...);
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/* debug of low-level TLB reload */
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#undef DEBUG
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@ -164,8 +42,8 @@ unsigned long cris_signal_return_page;
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* address.
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*
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* error_code:
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* bit 0 == 0 means no page found, 1 means protection fault
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* bit 1 == 0 means read, 1 means write
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* bit 0 == 0 means no page found, 1 means protection fault
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* bit 1 == 0 means read, 1 means write
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*
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* If this routine detects a bad access, it returns 1, otherwise it
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* returns 0.
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@ -181,9 +59,10 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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siginfo_t info;
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int fault;
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D(printk("Page fault for %lX on %X at %lX, prot %d write %d\n",
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address, smp_processor_id(), instruction_pointer(regs),
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protection, writeaccess));
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D(printk(KERN_DEBUG
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"Page fault for %lX on %X at %lX, prot %d write %d\n",
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address, smp_processor_id(), instruction_pointer(regs),
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protection, writeaccess));
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tsk = current;
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@ -233,7 +112,7 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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* context, we must not take the fault..
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*/
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if (in_atomic() || !mm)
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if (in_interrupt() || !mm)
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goto no_context;
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down_read(&mm->mmap_sem);
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@ -319,6 +198,9 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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/* info.si_code has been set above */
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info.si_addr = (void *)address;
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force_sig_info(SIGSEGV, &info, tsk);
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printk(KERN_NOTICE "%s (pid %d) segfaults for page "
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"address %08lx at pc %08lx\n",
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tsk->comm, tsk->pid, address, instruction_pointer(regs));
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return;
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}
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@ -326,7 +208,7 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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/* Are we prepared to handle this kernel fault?
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*
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* (The kernel has valid exception-points in the source
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* (The kernel has valid exception-points in the source
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* when it acesses user-memory. When it fails in one
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* of those points, we find it in a table and do a jump
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* to some fixup code that loads an appropriate error
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@ -341,13 +223,18 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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* terminate things with extreme prejudice.
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*/
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if ((unsigned long) (address) < PAGE_SIZE)
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raw_printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
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else
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raw_printk(KERN_ALERT "Unable to handle kernel access");
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raw_printk(" at virtual address %08lx\n",address);
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if (!oops_in_progress) {
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oops_in_progress = 1;
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if ((unsigned long) (address) < PAGE_SIZE)
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printk(KERN_ALERT "Unable to handle kernel NULL "
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"pointer dereference");
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else
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printk(KERN_ALERT "Unable to handle kernel access"
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" at virtual address %08lx\n", address);
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die_if_kernel("Oops", regs, (writeaccess << 1) | protection);
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die_if_kernel("Oops", regs, (writeaccess << 1) | protection);
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oops_in_progress = 0;
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}
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do_exit(SIGKILL);
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@ -360,7 +247,7 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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up_read(&mm->mmap_sem);
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printk("VM: killing process %s\n", tsk->comm);
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if (user_mode(regs))
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do_group_exit(SIGKILL);
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do_exit(SIGKILL);
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goto no_context;
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do_sigbus:
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@ -406,8 +293,8 @@ vmalloc_fault:
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/* Since we're two-level, we don't need to do both
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* set_pgd and set_pmd (they do the same thing). If
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* we go three-level at some point, do the right thing
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* with pgd_present and set_pgd here.
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*
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* with pgd_present and set_pgd here.
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*
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* Also, since the vmalloc area is global, we don't
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* need to copy individual PTE's, it is enough to
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* copy the pgd pointer into the pte page of the
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