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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> |
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23 | #include <asm/assembly.h> |
24 | #include <asm/errno.h> | |
0b3d643f | 25 | #include <linux/linkage.h> |
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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 | |
0b3d643f | 34 | #ifdef CONFIG_64BIT |
1da177e4 LT |
35 | extrd,u \t2,63,32,\t2 |
36 | #endif | |
37 | /* t2 = &__per_cpu_offset[smp_processor_id()]; */ | |
61520e1f | 38 | LDREGX \t2(\t1),\t2 |
dd17c8f7 RR |
39 | addil LT%exception_data,%r27 |
40 | LDREG RT%exception_data(%r1),\t1 | |
1da177e4 LT |
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) */ | |
dd17c8f7 RR |
49 | addil LT%exception_data,%r27 |
50 | LDREG RT%exception_data(%r1),\t2 | |
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51 | /* t1 = t2->fault_ip */ |
52 | LDREG EXCDATA_IP(\t2), \t1 | |
53 | .endm | |
54 | #endif | |
55 | ||
61520e1f GG |
56 | .level LEVEL |
57 | ||
dfcf753b | 58 | .text |
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59 | .section .fixup, "ax" |
60 | ||
61 | /* get_user() fixups, store -EFAULT in r8, and 0 in r9 */ | |
0b3d643f | 62 | ENTRY(fixup_get_user_skip_1) |
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63 | get_fault_ip %r1,%r8 |
64 | ldo 4(%r1), %r1 | |
65 | ldi -EFAULT, %r8 | |
66 | bv %r0(%r1) | |
67 | copy %r0, %r9 | |
0b3d643f | 68 | ENDPROC(fixup_get_user_skip_1) |
1da177e4 | 69 | |
0b3d643f | 70 | ENTRY(fixup_get_user_skip_2) |
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71 | get_fault_ip %r1,%r8 |
72 | ldo 8(%r1), %r1 | |
73 | ldi -EFAULT, %r8 | |
74 | bv %r0(%r1) | |
75 | copy %r0, %r9 | |
0b3d643f | 76 | ENDPROC(fixup_get_user_skip_2) |
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77 | |
78 | /* put_user() fixups, store -EFAULT in r8 */ | |
0b3d643f | 79 | ENTRY(fixup_put_user_skip_1) |
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80 | get_fault_ip %r1,%r8 |
81 | ldo 4(%r1), %r1 | |
82 | bv %r0(%r1) | |
83 | ldi -EFAULT, %r8 | |
0b3d643f | 84 | ENDPROC(fixup_put_user_skip_1) |
1da177e4 | 85 | |
0b3d643f | 86 | ENTRY(fixup_put_user_skip_2) |
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87 | get_fault_ip %r1,%r8 |
88 | ldo 8(%r1), %r1 | |
89 | bv %r0(%r1) | |
90 | ldi -EFAULT, %r8 | |
0b3d643f HD |
91 | ENDPROC(fixup_put_user_skip_2) |
92 |