93 lines
2.3 KiB
ArmAsm
93 lines
2.3 KiB
ArmAsm
/*
|
|
* Linux/PA-RISC Project (http://www.parisc-linux.org/)
|
|
*
|
|
* Copyright (C) 2004 Randolph Chung <tausq@debian.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Fixup routines for kernel exception handling.
|
|
*/
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/assembly.h>
|
|
#include <asm/errno.h>
|
|
#include <linux/linkage.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
.macro get_fault_ip t1 t2
|
|
addil LT%__per_cpu_offset,%r27
|
|
LDREG RT%__per_cpu_offset(%r1),\t1
|
|
/* t2 = smp_processor_id() */
|
|
mfctl 30,\t2
|
|
ldw TI_CPU(\t2),\t2
|
|
#ifdef CONFIG_64BIT
|
|
extrd,u \t2,63,32,\t2
|
|
#endif
|
|
/* t2 = &__per_cpu_offset[smp_processor_id()]; */
|
|
LDREGX \t2(\t1),\t2
|
|
addil LT%exception_data,%r27
|
|
LDREG RT%exception_data(%r1),\t1
|
|
/* t1 = this_cpu_ptr(&exception_data) */
|
|
add,l \t1,\t2,\t1
|
|
/* t1 = t1->fault_ip */
|
|
LDREG EXCDATA_IP(\t1), \t1
|
|
.endm
|
|
#else
|
|
.macro get_fault_ip t1 t2
|
|
/* t1 = this_cpu_ptr(&exception_data) */
|
|
addil LT%exception_data,%r27
|
|
LDREG RT%exception_data(%r1),\t2
|
|
/* t1 = t2->fault_ip */
|
|
LDREG EXCDATA_IP(\t2), \t1
|
|
.endm
|
|
#endif
|
|
|
|
.level LEVEL
|
|
|
|
.text
|
|
.section .fixup, "ax"
|
|
|
|
/* get_user() fixups, store -EFAULT in r8, and 0 in r9 */
|
|
ENTRY(fixup_get_user_skip_1)
|
|
get_fault_ip %r1,%r8
|
|
ldo 4(%r1), %r1
|
|
ldi -EFAULT, %r8
|
|
bv %r0(%r1)
|
|
copy %r0, %r9
|
|
ENDPROC(fixup_get_user_skip_1)
|
|
|
|
ENTRY(fixup_get_user_skip_2)
|
|
get_fault_ip %r1,%r8
|
|
ldo 8(%r1), %r1
|
|
ldi -EFAULT, %r8
|
|
bv %r0(%r1)
|
|
copy %r0, %r9
|
|
ENDPROC(fixup_get_user_skip_2)
|
|
|
|
/* put_user() fixups, store -EFAULT in r8 */
|
|
ENTRY(fixup_put_user_skip_1)
|
|
get_fault_ip %r1,%r8
|
|
ldo 4(%r1), %r1
|
|
bv %r0(%r1)
|
|
ldi -EFAULT, %r8
|
|
ENDPROC(fixup_put_user_skip_1)
|
|
|
|
ENTRY(fixup_put_user_skip_2)
|
|
get_fault_ip %r1,%r8
|
|
ldo 8(%r1), %r1
|
|
bv %r0(%r1)
|
|
ldi -EFAULT, %r8
|
|
ENDPROC(fixup_put_user_skip_2)
|
|
|