1/*
2 * Copyright Altera Corporation (C) <2014>. All rights reserved
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program.  If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#ifndef __ASM_NIOS2_SYSCALL_H__
18#define __ASM_NIOS2_SYSCALL_H__
19
20#include <linux/err.h>
21#include <linux/sched.h>
22
23static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
24{
25	return regs->r2;
26}
27
28static inline void syscall_rollback(struct task_struct *task,
29				struct pt_regs *regs)
30{
31	regs->r2 = regs->orig_r2;
32	regs->r7 = regs->orig_r7;
33}
34
35static inline long syscall_get_error(struct task_struct *task,
36				struct pt_regs *regs)
37{
38	return regs->r7 ? regs->r2 : 0;
39}
40
41static inline long syscall_get_return_value(struct task_struct *task,
42	struct pt_regs *regs)
43{
44	return regs->r2;
45}
46
47static inline void syscall_set_return_value(struct task_struct *task,
48	struct pt_regs *regs, int error, long val)
49{
50	if (error) {
51		/* error < 0, but nios2 uses > 0 return value */
52		regs->r2 = -error;
53		regs->r7 = 1;
54	} else {
55		regs->r2 = val;
56		regs->r7 = 0;
57	}
58}
59
60static inline void syscall_get_arguments(struct task_struct *task,
61	struct pt_regs *regs, unsigned int i, unsigned int n,
62	unsigned long *args)
63{
64	BUG_ON(i + n > 6);
65
66	switch (i) {
67	case 0:
68		if (!n--)
69			break;
70		*args++ = regs->r4;
71	case 1:
72		if (!n--)
73			break;
74		*args++ = regs->r5;
75	case 2:
76		if (!n--)
77			break;
78		*args++ = regs->r6;
79	case 3:
80		if (!n--)
81			break;
82		*args++ = regs->r7;
83	case 4:
84		if (!n--)
85			break;
86		*args++ = regs->r8;
87	case 5:
88		if (!n--)
89			break;
90		*args++ = regs->r9;
91	case 6:
92		if (!n--)
93			break;
94	default:
95		BUG();
96	}
97}
98
99static inline void syscall_set_arguments(struct task_struct *task,
100	struct pt_regs *regs, unsigned int i, unsigned int n,
101	const unsigned long *args)
102{
103	BUG_ON(i + n > 6);
104
105	switch (i) {
106	case 0:
107		if (!n--)
108			break;
109		regs->r4 = *args++;
110	case 1:
111		if (!n--)
112			break;
113		regs->r5 = *args++;
114	case 2:
115		if (!n--)
116			break;
117		regs->r6 = *args++;
118	case 3:
119		if (!n--)
120			break;
121		regs->r7 = *args++;
122	case 4:
123		if (!n--)
124			break;
125		regs->r8 = *args++;
126	case 5:
127		if (!n--)
128			break;
129		regs->r9 = *args++;
130	case 6:
131		if (!n)
132			break;
133	default:
134		BUG();
135	}
136}
137
138#endif
139