2ef4dfd9d9
Handling exceptions from modules never worked on parisc. It was just masked by the fact that exceptions from modules don't happen during normal use. When a module triggers an exception in get_user() we need to load the main kernel dp value before accessing the exception_data structure, and afterwards restore the original dp value of the module on exit. Noticed-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org
99 lines
2.5 KiB
ArmAsm
99 lines
2.5 KiB
ArmAsm
/*
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* Linux/PA-RISC Project (http://www.parisc-linux.org/)
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*
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* Copyright (C) 2004 Randolph Chung <tausq@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Fixup routines for kernel exception handling.
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*/
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#include <asm/asm-offsets.h>
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#include <asm/assembly.h>
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#include <asm/errno.h>
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#include <linux/linkage.h>
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#ifdef CONFIG_SMP
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.macro get_fault_ip t1 t2
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loadgp
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addil LT%__per_cpu_offset,%r27
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LDREG RT%__per_cpu_offset(%r1),\t1
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/* t2 = smp_processor_id() */
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mfctl 30,\t2
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ldw TI_CPU(\t2),\t2
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#ifdef CONFIG_64BIT
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extrd,u \t2,63,32,\t2
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#endif
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/* t2 = &__per_cpu_offset[smp_processor_id()]; */
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LDREGX \t2(\t1),\t2
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addil LT%exception_data,%r27
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LDREG RT%exception_data(%r1),\t1
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/* t1 = this_cpu_ptr(&exception_data) */
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add,l \t1,\t2,\t1
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/* %r27 = t1->fault_gp - restore gp */
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LDREG EXCDATA_GP(\t1), %r27
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/* t1 = t1->fault_ip */
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LDREG EXCDATA_IP(\t1), \t1
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.endm
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#else
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.macro get_fault_ip t1 t2
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loadgp
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/* t1 = this_cpu_ptr(&exception_data) */
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addil LT%exception_data,%r27
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LDREG RT%exception_data(%r1),\t2
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/* %r27 = t2->fault_gp - restore gp */
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LDREG EXCDATA_GP(\t2), %r27
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/* t1 = t2->fault_ip */
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LDREG EXCDATA_IP(\t2), \t1
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.endm
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#endif
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.level LEVEL
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.text
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.section .fixup, "ax"
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/* get_user() fixups, store -EFAULT in r8, and 0 in r9 */
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ENTRY(fixup_get_user_skip_1)
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get_fault_ip %r1,%r8
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ldo 4(%r1), %r1
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ldi -EFAULT, %r8
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bv %r0(%r1)
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copy %r0, %r9
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ENDPROC(fixup_get_user_skip_1)
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ENTRY(fixup_get_user_skip_2)
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get_fault_ip %r1,%r8
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ldo 8(%r1), %r1
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ldi -EFAULT, %r8
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bv %r0(%r1)
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copy %r0, %r9
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ENDPROC(fixup_get_user_skip_2)
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/* put_user() fixups, store -EFAULT in r8 */
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ENTRY(fixup_put_user_skip_1)
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get_fault_ip %r1,%r8
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ldo 4(%r1), %r1
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bv %r0(%r1)
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ldi -EFAULT, %r8
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ENDPROC(fixup_put_user_skip_1)
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ENTRY(fixup_put_user_skip_2)
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get_fault_ip %r1,%r8
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ldo 8(%r1), %r1
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bv %r0(%r1)
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ldi -EFAULT, %r8
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ENDPROC(fixup_put_user_skip_2)
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