| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Linux/PA-RISC Project (http://www.parisc-linux.org/) |
| 3 | * |
| 4 | * Copyright (C) 2004 Randolph Chung <tausq@debian.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | * |
| 20 | * Fixup routines for kernel exception handling. |
| 21 | */ |
| 22 | #include <linux/config.h> |
| 23 | #include <asm/offsets.h> |
| 24 | #include <asm/assembly.h> |
| 25 | #include <asm/errno.h> |
| 26 | |
| 27 | #ifdef CONFIG_SMP |
| 28 | .macro get_fault_ip t1 t2 |
| 29 | addil LT%__per_cpu_offset,%r27 |
| 30 | LDREG RT%__per_cpu_offset(%r1),\t1 |
| 31 | /* t2 = smp_processor_id() */ |
| 32 | mfctl 30,\t2 |
| 33 | ldw TI_CPU(\t2),\t2 |
| 34 | #ifdef __LP64__ |
| 35 | extrd,u \t2,63,32,\t2 |
| 36 | #endif |
| 37 | /* t2 = &__per_cpu_offset[smp_processor_id()]; */ |
| 38 | LDREG,s \t2(\t1),\t2 |
| 39 | addil LT%per_cpu__exception_data,%r27 |
| 40 | LDREG RT%per_cpu__exception_data(%r1),\t1 |
| 41 | /* t1 = &__get_cpu_var(exception_data) */ |
| 42 | add,l \t1,\t2,\t1 |
| 43 | /* t1 = t1->fault_ip */ |
| 44 | LDREG EXCDATA_IP(\t1), \t1 |
| 45 | .endm |
| 46 | #else |
| 47 | .macro get_fault_ip t1 t2 |
| 48 | /* t1 = &__get_cpu_var(exception_data) */ |
| 49 | addil LT%per_cpu__exception_data,%r27 |
| 50 | LDREG RT%per_cpu__exception_data(%r1),\t2 |
| 51 | /* t1 = t2->fault_ip */ |
| 52 | LDREG EXCDATA_IP(\t2), \t1 |
| 53 | .endm |
| 54 | #endif |
| 55 | |
| 56 | .text |
| 57 | .section .fixup, "ax" |
| 58 | |
| 59 | /* get_user() fixups, store -EFAULT in r8, and 0 in r9 */ |
| 60 | .export fixup_get_user_skip_1 |
| 61 | fixup_get_user_skip_1: |
| 62 | get_fault_ip %r1,%r8 |
| 63 | ldo 4(%r1), %r1 |
| 64 | ldi -EFAULT, %r8 |
| 65 | bv %r0(%r1) |
| 66 | copy %r0, %r9 |
| 67 | |
| 68 | .export fixup_get_user_skip_2 |
| 69 | fixup_get_user_skip_2: |
| 70 | get_fault_ip %r1,%r8 |
| 71 | ldo 8(%r1), %r1 |
| 72 | ldi -EFAULT, %r8 |
| 73 | bv %r0(%r1) |
| 74 | copy %r0, %r9 |
| 75 | |
| 76 | /* put_user() fixups, store -EFAULT in r8 */ |
| 77 | .export fixup_put_user_skip_1 |
| 78 | fixup_put_user_skip_1: |
| 79 | get_fault_ip %r1,%r8 |
| 80 | ldo 4(%r1), %r1 |
| 81 | bv %r0(%r1) |
| 82 | ldi -EFAULT, %r8 |
| 83 | |
| 84 | .export fixup_put_user_skip_2 |
| 85 | fixup_put_user_skip_2: |
| 86 | get_fault_ip %r1,%r8 |
| 87 | ldo 8(%r1), %r1 |
| 88 | bv %r0(%r1) |
| 89 | ldi -EFAULT, %r8 |