projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | */ | |
| 0013a854 | 22 | #include <asm/asm-offsets.h> |
| 1da177e4 LT |
23 | #include <asm/assembly.h> |
| 24 | #include <asm/errno.h> | |
| 0b3d643f | 25 | #include <linux/linkage.h> |
| 1da177e4 LT |
26 | |
| 27 | #ifdef CONFIG_SMP | |
| 28 | .macro get_fault_ip t1 t2 | |
| 2ef4dfd9 | 29 | loadgp |
| 1da177e4 LT |
30 | addil LT%__per_cpu_offset,%r27 |
| 31 | LDREG RT%__per_cpu_offset(%r1),\t1 | |
| 32 | /* t2 = smp_processor_id() */ | |
| 33 | mfctl 30,\t2 | |
| 34 | ldw TI_CPU(\t2),\t2 | |
| 0b3d643f | 35 | #ifdef CONFIG_64BIT |
| 1da177e4 LT |
36 | extrd,u \t2,63,32,\t2 |
| 37 | #endif | |
| 38 | /* t2 = &__per_cpu_offset[smp_processor_id()]; */ | |
| 61520e1f | 39 | LDREGX \t2(\t1),\t2 |
| dd17c8f7 RR |
40 | addil LT%exception_data,%r27 |
| 41 | LDREG RT%exception_data(%r1),\t1 | |
| 6ddb798f | 42 | /* t1 = this_cpu_ptr(&exception_data) */ |
| 1da177e4 | 43 | add,l \t1,\t2,\t1 |
| 2ef4dfd9 HD |
44 | /* %r27 = t1->fault_gp - restore gp */ |
| 45 | LDREG EXCDATA_GP(\t1), %r27 | |
| 1da177e4 LT |
46 | /* t1 = t1->fault_ip */ |
| 47 | LDREG EXCDATA_IP(\t1), \t1 | |
| 48 | .endm | |
| 49 | #else | |
| 50 | .macro get_fault_ip t1 t2 | |
| 2ef4dfd9 | 51 | loadgp |
| 6ddb798f | 52 | /* t1 = this_cpu_ptr(&exception_data) */ |
| dd17c8f7 RR |
53 | addil LT%exception_data,%r27 |
| 54 | LDREG RT%exception_data(%r1),\t2 | |
| 2ef4dfd9 HD |
55 | /* %r27 = t2->fault_gp - restore gp */ |
| 56 | LDREG EXCDATA_GP(\t2), %r27 | |
| 1da177e4 LT |
57 | /* t1 = t2->fault_ip */ |
| 58 | LDREG EXCDATA_IP(\t2), \t1 | |
| 59 | .endm | |
| 60 | #endif | |
| 61 | ||
| 61520e1f GG |
62 | .level LEVEL |
| 63 | ||
| dfcf753b | 64 | .text |
| 1da177e4 LT |
65 | .section .fixup, "ax" |
| 66 | ||
| 67 | /* get_user() fixups, store -EFAULT in r8, and 0 in r9 */ | |
| 0b3d643f | 68 | ENTRY(fixup_get_user_skip_1) |
| 1da177e4 LT |
69 | get_fault_ip %r1,%r8 |
| 70 | ldo 4(%r1), %r1 | |
| 71 | ldi -EFAULT, %r8 | |
| 72 | bv %r0(%r1) | |
| 73 | copy %r0, %r9 | |
| 0b3d643f | 74 | ENDPROC(fixup_get_user_skip_1) |
| 1da177e4 | 75 | |
| 0b3d643f | 76 | ENTRY(fixup_get_user_skip_2) |
| 1da177e4 LT |
77 | get_fault_ip %r1,%r8 |
| 78 | ldo 8(%r1), %r1 | |
| 79 | ldi -EFAULT, %r8 | |
| 80 | bv %r0(%r1) | |
| 81 | copy %r0, %r9 | |
| 0b3d643f | 82 | ENDPROC(fixup_get_user_skip_2) |
| 1da177e4 LT |
83 | |
| 84 | /* put_user() fixups, store -EFAULT in r8 */ | |
| 0b3d643f | 85 | ENTRY(fixup_put_user_skip_1) |
| 1da177e4 LT |
86 | get_fault_ip %r1,%r8 |
| 87 | ldo 4(%r1), %r1 | |
| 88 | bv %r0(%r1) | |
| 89 | ldi -EFAULT, %r8 | |
| 0b3d643f | 90 | ENDPROC(fixup_put_user_skip_1) |
| 1da177e4 | 91 | |
| 0b3d643f | 92 | ENTRY(fixup_put_user_skip_2) |
| 1da177e4 LT |
93 | get_fault_ip %r1,%r8 |
| 94 | ldo 8(%r1), %r1 | |
| 95 | bv %r0(%r1) | |
| 96 | ldi -EFAULT, %r8 | |
| 0b3d643f HD |
97 | ENDPROC(fixup_put_user_skip_2) |
| 98 |