118 lines
2.4 KiB
C
118 lines
2.4 KiB
C
|
/* 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 (dhowells@redhat.com)
|
||
|
|
*
|
||
|
|
* 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 */
|