/* Access to user system call parameters and results
*
* See asm-generic/syscall.h for function descriptions.
*
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/

#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H

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

extern const unsigned long sys_call_table[];

static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
{
return regs->orig_d0;
}

static inline void syscall_rollback(struct task_struct *task,
struct pt_regs *regs)
{
regs->d0 = regs->orig_d0;
}

static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
unsigned long error = regs->d0;
return IS_ERR_VALUE(error) ? error : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
return regs->d0;
}

static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
regs->d0 = (long) 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->a0;
case 1:
if (!n--) break;
*args++ = regs->d1;
case 2:
if (!n--) break;
*args++ = regs->a3;
case 3:
if (!n--) break;
*args++ = regs->a2;
case 4:
if (!n--) break;
*args++ = regs->d3;
case 5:
if (!n--) break;
*args++ = regs->d2;
case 6:
if (!n--) break;
default:
BUG();
break;
}
}

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->a0 = *args++;
case 1:
if (!n--) break;
regs->d1 = *args++;
case 2:
if (!n--) break;
regs->a3 = *args++;
case 3:
if (!n--) break;
regs->a2 = *args++;
case 4:
if (!n--) break;
regs->d3 = *args++;
case 5:
if (!n--) break;
regs->d2 = *args++;
case 6:
if (!n--) break;
default:
BUG();
break;
}
}

#endif /* _ASM_SYSCALL_H */