1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#ifndef _ASM_ARC_SYSCALL_H
10#define _ASM_ARC_SYSCALL_H  1
11
12#include <linux/err.h>
13#include <linux/sched.h>
14#include <asm/unistd.h>
15#include <asm/ptrace.h>		/* in_syscall() */
16
17static inline long
18syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
19{
20	if (user_mode(regs) && in_syscall(regs))
21		return regs->r8;
22	else
23		return -1;
24}
25
26static inline void
27syscall_rollback(struct task_struct *task, struct pt_regs *regs)
28{
29	regs->r0 = regs->orig_r0;
30}
31
32static inline long
33syscall_get_error(struct task_struct *task, struct pt_regs *regs)
34{
35	/* 0 if syscall succeeded, otherwise -Errorcode */
36	return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
37}
38
39static inline long
40syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
41{
42	return regs->r0;
43}
44
45static inline void
46syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
47			 int error, long val)
48{
49	regs->r0 = (long) error ?: val;
50}
51
52/*
53 * @i:      argument index [0,5]
54 * @n:      number of arguments; n+i must be [1,6].
55 */
56static inline void
57syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
58		      unsigned int i, unsigned int n, unsigned long *args)
59{
60	unsigned long *inside_ptregs = &(regs->r0);
61	inside_ptregs -= i;
62
63	BUG_ON((i + n) > 6);
64
65	while (n--) {
66		args[i++] = (*inside_ptregs);
67		inside_ptregs--;
68	}
69}
70
71#endif
72