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- /*
- * 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>
- #include <linux/init.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%per_cpu__exception_data,%r27
- LDREG RT%per_cpu__exception_data(%r1),\t1
- /* t1 = &__get_cpu_var(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 = &__get_cpu_var(exception_data) */
- addil LT%per_cpu__exception_data,%r27
- LDREG RT%per_cpu__exception_data(%r1),\t2
- /* t1 = t2->fault_ip */
- LDREG EXCDATA_IP(\t2), \t1
- .endm
- #endif
- .level LEVEL
- __HEAD
- .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)
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