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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> |
bd3bb8c1 | 26 | #include <linux/init.h> |
1da177e4 LT |
27 | |
28 | #ifdef CONFIG_SMP | |
29 | .macro get_fault_ip t1 t2 | |
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 |
1da177e4 LT |
40 | addil LT%per_cpu__exception_data,%r27 |
41 | LDREG RT%per_cpu__exception_data(%r1),\t1 | |
42 | /* t1 = &__get_cpu_var(exception_data) */ | |
43 | add,l \t1,\t2,\t1 | |
44 | /* t1 = t1->fault_ip */ | |
45 | LDREG EXCDATA_IP(\t1), \t1 | |
46 | .endm | |
47 | #else | |
48 | .macro get_fault_ip t1 t2 | |
49 | /* t1 = &__get_cpu_var(exception_data) */ | |
50 | addil LT%per_cpu__exception_data,%r27 | |
51 | LDREG RT%per_cpu__exception_data(%r1),\t2 | |
52 | /* t1 = t2->fault_ip */ | |
53 | LDREG EXCDATA_IP(\t2), \t1 | |
54 | .endm | |
55 | #endif | |
56 | ||
61520e1f GG |
57 | .level LEVEL |
58 | ||
bd3bb8c1 | 59 | __HEAD |
1da177e4 LT |
60 | .section .fixup, "ax" |
61 | ||
62 | /* get_user() fixups, store -EFAULT in r8, and 0 in r9 */ | |
0b3d643f | 63 | ENTRY(fixup_get_user_skip_1) |
1da177e4 LT |
64 | get_fault_ip %r1,%r8 |
65 | ldo 4(%r1), %r1 | |
66 | ldi -EFAULT, %r8 | |
67 | bv %r0(%r1) | |
68 | copy %r0, %r9 | |
0b3d643f | 69 | ENDPROC(fixup_get_user_skip_1) |
1da177e4 | 70 | |
0b3d643f | 71 | ENTRY(fixup_get_user_skip_2) |
1da177e4 LT |
72 | get_fault_ip %r1,%r8 |
73 | ldo 8(%r1), %r1 | |
74 | ldi -EFAULT, %r8 | |
75 | bv %r0(%r1) | |
76 | copy %r0, %r9 | |
0b3d643f | 77 | ENDPROC(fixup_get_user_skip_2) |
1da177e4 LT |
78 | |
79 | /* put_user() fixups, store -EFAULT in r8 */ | |
0b3d643f | 80 | ENTRY(fixup_put_user_skip_1) |
1da177e4 LT |
81 | get_fault_ip %r1,%r8 |
82 | ldo 4(%r1), %r1 | |
83 | bv %r0(%r1) | |
84 | ldi -EFAULT, %r8 | |
0b3d643f | 85 | ENDPROC(fixup_put_user_skip_1) |
1da177e4 | 86 | |
0b3d643f | 87 | ENTRY(fixup_put_user_skip_2) |
1da177e4 LT |
88 | get_fault_ip %r1,%r8 |
89 | ldo 8(%r1), %r1 | |
90 | bv %r0(%r1) | |
91 | ldi -EFAULT, %r8 | |
0b3d643f HD |
92 | ENDPROC(fixup_put_user_skip_2) |
93 |