path: root/kernel/compat.c

/*
 *  linux/kernel/compat.c
 *
 *  Kernel compatibililty routines for e.g. 32 bit syscall support
 *  on 64 bit kernels.
 *
 *  Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
 *
 *  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.
 */

#include <linux/linkage.h>
#include <linux/compat.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/signal.h>
#include <linux/sched.h>	/* for MAX_SCHEDULE_TIMEOUT */
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/security.h>
#include <linux/timex.h>
#include <linux/export.h>
#include <linux/migrate.h>
#include <linux/posix-timers.h>
#include <linux/times.h>
#include <linux/ptrace.h>
#include <linux/gfp.h>

#include <asm/uaccess.h>

static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
{
	memset(txc, 0, sizeof(struct timex));

	if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
			__get_user(txc->modes, &utp->modes) ||
			__get_user(txc->offset, &utp->offset) ||
			__get_user(txc->freq, &utp->freq) ||
			__get_user(txc->maxerror, &utp->maxerror) ||
			__get_user(txc->esterror, &utp->esterror) ||
			__get_user(txc->status, &utp->status) ||
			__get_user(txc->constant, &utp->constant) ||
			__get_user(txc->precision, &utp->precision) ||
			__get_user(txc->tolerance, &utp->tolerance) ||
			__get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
			__get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
			__get_user(txc->tick, &utp->tick) ||
			__get_user(txc->ppsfreq, &utp->ppsfreq) ||
			__get_user(txc->jitter, &utp->jitter) ||
			__get_user(txc->shift, &utp->shift) ||
			__get_user(txc->stabil, &utp->stabil) ||
			__get_user(txc->jitcnt, &utp->jitcnt) ||
			__get_user(txc->calcnt, &utp->calcnt) ||
			__get_user(txc->errcnt, &utp->errcnt) ||
			__get_user(txc->stbcnt, &utp->stbcnt))
		return -EFAULT;

	return 0;
}

static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
{
	if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
			__put_user(txc->modes, &utp->modes) ||
			__put_user(txc->offset, &utp->offset) ||
			__put_user(txc->freq, &utp->freq) ||
			__put_user(txc->maxerror, &utp->maxerror) ||
			__put_user(txc->esterror, &utp->esterror) ||
			__put_user(txc->status, &utp->status) ||
			__put_user(txc->constant, &utp->constant) ||
			__put_user(txc->precision,