- * Copyright (C) 2000, 2001 Axis Communications AB
- *
- * Authors: Bjorn Wesen
- *
- * $Log: fault.c,v $
- * Revision 1.20 2005/03/04 08:16:18 starvik
- * Merge of Linux 2.6.11.
- *
- * Revision 1.19 2005/01/14 10:07:59 starvik
- * Fixed warning.
- *
- * Revision 1.18 2005/01/12 08:10:14 starvik
- * Readded the change of frametype when handling kernel page fault fixup
- * for v10. This is necessary to avoid that the CPU remakes the faulting
- * access.
- *
- * Revision 1.17 2005/01/11 13:53:05 starvik
- * Use raw_printk.
- *
- * Revision 1.16 2004/12/17 11:39:41 starvik
- * SMP support.
- *
- * Revision 1.15 2004/11/23 18:36:18 starvik
- * Stack is now non-executable.
- * Signal handler trampolines are placed in a reserved page mapped into all
- * processes.
- *
- * Revision 1.14 2004/11/23 07:10:21 starvik
- * Moved find_fixup_code to generic code.
- *
- * Revision 1.13 2004/11/23 07:00:54 starvik
- * Actually use the execute permission bit in the MMU. This makes it possible
- * to prevent e.g. attacks where executable code is put on the stack.
- *
- * Revision 1.12 2004/09/29 06:16:04 starvik
- * Use instruction_pointer
- *
- * Revision 1.11 2004/05/14 07:58:05 starvik
- * Merge of changes from 2.4
- *
- * Revision 1.10 2003/10/27 14:51:24 starvik
- * Removed debugcode
- *
- * Revision 1.9 2003/10/27 14:50:42 starvik
- * Changed do_page_fault signature
- *
- * Revision 1.8 2003/07/04 13:02:48 tobiasa
- * Moved code snippet from arch/cris/mm/fault.c that searches for fixup code
- * to seperate function in arch-specific files.
- *
- * Revision 1.7 2003/01/22 06:48:38 starvik
- * Fixed warnings issued by GCC 3.2.1
- *
- * Revision 1.6 2003/01/09 14:42:52 starvik
- * Merge of Linux 2.5.55
- *
- * Revision 1.5 2002/12/11 14:44:48 starvik
- * Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/mm
- *
- * Revision 1.4 2002/11/13 15:10:28 starvik
- * pte_offset has been renamed to pte_offset_kernel
- *
- * Revision 1.3 2002/11/05 06:45:13 starvik
- * Merge of Linux 2.5.45
- *
- * Revision 1.2 2001/12/18 13:35:22 bjornw
- * Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
- *
- * Revision 1.20 2001/11/22 13:34:06 bjornw
- * * Bug workaround (LX TR89): force a rerun of the whole of an interrupted
- * unaligned write, because the second half of the write will be corrupted
- * otherwise. Affected unaligned writes spanning not-yet mapped pages.
- * * Optimization: use the wr_rd bit in R_MMU_CAUSE to know whether a miss
- * was due to a read or a write (before we didn't know this until the next
- * restart of the interrupted instruction, thus wasting one fault-irq)
- *
- * Revision 1.19 2001/11/12 19:02:10 pkj
- * Fixed compiler warnings.
- *
- * Revision 1.18 2001/07/18 22:14:32 bjornw
- * Enable interrupts in the bulk of do_page_fault
- *
- * Revision 1.17 2001/07/18 13:07:23 bjornw
- * * Detect non-existant PTE's in vmalloc pmd synchronization
- * * Remove comment about fast-paths for VMALLOC_START etc, because all that
- * was totally bogus anyway it turned out :)
- * * Fix detection of vmalloc-area synchronization
- * * Add some comments
- *
- * Revision 1.16 2001/06/13 00:06:08 bjornw
- * current_pgd should be volatile
- *
- * Revision 1.15 2001/06/13 00:02:23 bjornw
- * Use a separate variable to store the current pgd to avoid races in schedule
- *
- * Revision 1.14 2001/05/16 17:41:07 hp
- * Last comment tweak further tweaked.
- *
- * Revision 1.13 2001/05/15 00:58:44 hp
- * Expand a bit on the comment why we compare address >= TASK_SIZE rather
- * than >= VMALLOC_START.
- *
- * Revision 1.12 2001/04/04 10:51:14 bjornw
- * mmap_sem is grabbed for reading
- *
- * Revision 1.11 2001/03/23 07:36:07 starvik
- * Corrected according to review remarks
- *
- * Revision 1.10 2001/03/21 16:10:11 bjornw
- * CRIS_FRAME_FIXUP not needed anymore, use FRAME_NORMAL
- *
- * Revision 1.9 2001/03/05 13:22:20 bjornw
- * Spell-fix and fix in vmalloc_fault handling
- *
- * Revision 1.8 2000/11/22 14:45:31 bjornw
- * * 2.4.0-test10 removed the set_pgdir instantaneous kernel global mapping
- * into all processes. Instead we fill in the missing PTE entries on demand.
- *
- * Revision 1.7 2000/11/21 16:39:09 bjornw
- * fixup switches frametype
- *
- * Revision 1.6 2000/11/17 16:54:08 bjornw
- * More detailed siginfo reporting