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Commit 3e1fdc4e authored by Jesper Nilsson's avatar Jesper Nilsson
Browse files

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.
parent 75e52b27

arch/cris/mm/fault.c

+28 −141
Original line number Diff line number Diff line 
/*

 *  linux/arch/cris/mm/fault.c

 *

 *  Copyright (C) 2000, 2001  Axis Communications AB

 *  Copyright (C) 2000-2006  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

 *  Re-added 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 separate 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

 *

 *

 */



#include <linux/mm.h>
@@ -135,7 +14,6 @@ 


extern int find_fixup_code(struct pt_regs *);

extern void die_if_kernel(const char *, struct pt_regs *, long);

extern int raw_printk(const char *fmt, ...);



/* debug of low-level TLB reload */

#undef DEBUG
@@ -181,7 +59,8 @@ do_page_fault(unsigned long address, struct pt_regs *regs, 
	siginfo_t info;

	int fault;



        D(printk("Page fault for %lX on %X at %lX, prot %d write %d\n",

	D(printk(KERN_DEBUG

		 "Page fault for %lX on %X at %lX, prot %d write %d\n",

		 address, smp_processor_id(), instruction_pointer(regs),

		 protection, writeaccess));
@@ -233,7 +112,7 @@ do_page_fault(unsigned long address, struct pt_regs *regs, 
	 * context, we must not take the fault..

	 */



	if (in_atomic() || !mm)

	if (in_interrupt() || !mm)

		goto no_context;



	down_read(&mm->mmap_sem);
@@ -319,6 +198,9 @@ do_page_fault(unsigned long address, struct pt_regs *regs, 
		/* info.si_code has been set above */

		info.si_addr = (void *)address;

		force_sig_info(SIGSEGV, &info, tsk);

		printk(KERN_NOTICE "%s (pid %d) segfaults for page "

		       "address %08lx at pc %08lx\n",

		       tsk->comm, tsk->pid, address, instruction_pointer(regs));

		return;

	}
@@ -341,13 +223,18 @@ do_page_fault(unsigned long address, struct pt_regs *regs, 
	 * terminate things with extreme prejudice.

	 */



	if (!oops_in_progress) {

		oops_in_progress = 1;

		if ((unsigned long) (address) < PAGE_SIZE)

		raw_printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");

			printk(KERN_ALERT "Unable to handle kernel NULL "

				"pointer dereference");

		else

		raw_printk(KERN_ALERT "Unable to handle kernel access");

	raw_printk(" at virtual address %08lx\n",address);

			printk(KERN_ALERT "Unable to handle kernel access"

				" at virtual address %08lx\n", address);



		die_if_kernel("Oops", regs, (writeaccess << 1) | protection);

		oops_in_progress = 0;

	}



	do_exit(SIGKILL);
@@ -360,7 +247,7 @@ do_page_fault(unsigned long address, struct pt_regs *regs, 
	up_read(&mm->mmap_sem);

	printk("VM: killing process %s\n", tsk->comm);

	if (user_mode(regs))

		do_group_exit(SIGKILL);

		do_exit(SIGKILL);

	goto no_context;



 do_sigbus: