tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/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 LDREGX \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 .level LEVEL
57
58 .text
59 .section .fixup, "ax"
60
61 /* get_user() fixups, store -EFAULT in r8, and 0 in r9 */
62 .export fixup_get_user_skip_1
63fixup_get_user_skip_1:
64 get_fault_ip %r1,%r8
65 ldo 4(%r1), %r1
66 ldi -EFAULT, %r8
67 bv %r0(%r1)
68 copy %r0, %r9
69
70 .export fixup_get_user_skip_2
71fixup_get_user_skip_2:
72 get_fault_ip %r1,%r8
73 ldo 8(%r1), %r1
74 ldi -EFAULT, %r8
75 bv %r0(%r1)
76 copy %r0, %r9
77
78 /* put_user() fixups, store -EFAULT in r8 */
79 .export fixup_put_user_skip_1
80fixup_put_user_skip_1:
81 get_fault_ip %r1,%r8
82 ldo 4(%r1), %r1
83 bv %r0(%r1)
84 ldi -EFAULT, %r8
85
86 .export fixup_put_user_skip_2
87fixup_put_user_skip_2:
88 get_fault_ip %r1,%r8
89 ldo 8(%r1), %r1
90 bv %r0(%r1)
91 ldi -EFAULT, %r8