/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/

#ifndef _ASM_ARC_SYSCALL_H
#define _ASM_ARC_SYSCALL_H 1

#include <linux/err.h>
#include <linux/sched.h>
#include <asm/unistd.h>
#include <asm/ptrace.h> /* in_syscall() */

static inline long
syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
{
if (user_mode(regs) && in_syscall(regs))
return regs->r8;
else
return -1;
}

static inline void
syscall_rollback(struct task_struct *task, struct pt_regs *regs)
{
regs->r0 = regs->orig_r0;
}

static inline long
syscall_get_error(struct task_struct *task, struct pt_regs *regs)
{
/* 0 if syscall succeeded, otherwise -Errorcode */
return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
}

static inline long
syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
{
return regs->r0;
}

static inline void
syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
int error, long val)
{
regs->r0 = (long) error ?: val;
}

/*
* @i: argument index [0,5]
* @n: number of arguments; n+i must be [1,6].
*/
static inline void
syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
unsigned int i, unsigned int n, unsigned long *args)
{
unsigned long *inside_ptregs = &(regs->r0);
inside_ptregs -= i;

BUG_ON((i + n) > 6);

while (n--) {
args[i++] = (*inside_ptregs);
inside_ptregs--;
}
}

#endif