aboutsummaryrefslogtreecommitdiff
path: root/arch/c6x/include/asm/syscall.h
blob: ae2be315ee9c98d8440f4409be8b67cc261f8858 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
/*
 * Copyright (C) 2011 Texas Instruments Incorporated
 * Author: Mark Salter <msalter@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef __ASM_C6X_SYSCALL_H
#define __ASM_C6X_SYSCALL_H

#include <linux/err.h>
#include <linux/sched.h>

static inline int syscall_get_nr(struct task_struct *task,
				 struct pt_regs *regs)
{
	return regs->b0;
}

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	/* do nothing */
}

static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
	return IS_ERR_VALUE(regs->a4) ? regs->a4 : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
					    struct pt_regs *regs)
{
	return regs->a4;
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
	regs->a4 = error ?: val;
}

static inline void syscall_get_arguments(struct task_struct *task,
					 struct pt_regs *regs, unsigned int i,
					 unsigned int n, unsigned long *args)
{
	switch (i) {
	case 0:
		if (!n--)
			break;
		*args++ = regs->a4;
	case 1:
		if (!n--)
			break;
		*args++ = regs->b4;
	case 2:
		if (!n--)
			break;
		*args++ = regs->a6;
	case 3:
		if (!n--)
			break;
		*args++ = regs->b6;
	case 4:
		if (!n--)
			break;
		*args++ = regs->a8;
	case 5:
		if (!n--)
			break;
		*args++ = regs->b8;
	case 6:
		if (!n--)
			break;
	default:
		BUG();
	}
}

static inline void syscall_set_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 const unsigned long *args)
{
	switch (i) {
	case 0:
		if (!n--)
			break;
		regs->a4 = *args++;
	case 1:
		if (!n--)
			break;
		regs->b4 = *args++;
	case 2:
		if (!n--)
			break;
		regs->a6 = *args++;
	case 3:
		if (!n--)
			break;
		regs->b6 = *args++;
	case 4:
		if (!n--)
			break;
		regs->a8 = *args++;
	case 5:
		if (!n--)
			break;
		regs->a9 = *args++;
	case 6:
		if (!n)
			break;
	default:
		BUG();
	}
}

#endif /* __ASM_C6X_SYSCALLS_H */