diff options
Diffstat (limited to 'arch/parisc/lib/fixup.S')
| -rw-r--r-- | arch/parisc/lib/fixup.S | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/arch/parisc/lib/fixup.S b/arch/parisc/lib/fixup.S new file mode 100644 index 000000000000..134f0cd240f5 --- /dev/null +++ b/arch/parisc/lib/fixup.S @@ -0,0 +1,89 @@ +/* + * 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 <linux/config.h> +#include <asm/offsets.h> +#include <asm/assembly.h> +#include <asm/errno.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 __LP64__ + extrd,u \t2,63,32,\t2 +#endif + /* t2 = &__per_cpu_offset[smp_processor_id()]; */ + LDREG,s \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 + + .text + .section .fixup, "ax" + + /* get_user() fixups, store -EFAULT in r8, and 0 in r9 */ + .export fixup_get_user_skip_1 +fixup_get_user_skip_1: + get_fault_ip %r1,%r8 + ldo 4(%r1), %r1 + ldi -EFAULT, %r8 + bv %r0(%r1) + copy %r0, %r9 + + .export fixup_get_user_skip_2 +fixup_get_user_skip_2: + get_fault_ip %r1,%r8 + ldo 8(%r1), %r1 + ldi -EFAULT, %r8 + bv %r0(%r1) + copy %r0, %r9 + + /* put_user() fixups, store -EFAULT in r8 */ + .export fixup_put_user_skip_1 +fixup_put_user_skip_1: + get_fault_ip %r1,%r8 + ldo 4(%r1), %r1 + bv %r0(%r1) + ldi -EFAULT, %r8 + + .export fixup_put_user_skip_2 +fixup_put_user_skip_2: + get_fault_ip %r1,%r8 + ldo 8(%r1), %r1 + bv %r0(%r1) + ldi -EFAULT, %r8 |