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 <asm/asm-offsets.h>
23#include <asm/assembly.h>
24#include <asm/errno.h>
25#include <linux/linkage.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 CONFIG_64BIT
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 */
62ENTRY(fixup_get_user_skip_1)
63	get_fault_ip %r1,%r8
64	ldo 4(%r1), %r1
65	ldi -EFAULT, %r8
66	bv %r0(%r1)
67	copy %r0, %r9
68ENDPROC(fixup_get_user_skip_1)
69
70ENTRY(fixup_get_user_skip_2)
71	get_fault_ip %r1,%r8
72	ldo 8(%r1), %r1
73	ldi -EFAULT, %r8
74	bv %r0(%r1)
75	copy %r0, %r9
76ENDPROC(fixup_get_user_skip_2)
77
78	/* put_user() fixups, store -EFAULT in r8 */
79ENTRY(fixup_put_user_skip_1)
80	get_fault_ip %r1,%r8
81	ldo 4(%r1), %r1
82	bv %r0(%r1)
83	ldi -EFAULT, %r8
84ENDPROC(fixup_put_user_skip_1)
85
86ENTRY(fixup_put_user_skip_2)
87	get_fault_ip %r1,%r8
88	ldo 8(%r1), %r1
89	bv %r0(%r1)
90	ldi -EFAULT, %r8
91ENDPROC(fixup_put_user_skip_2)
92