blob: 7b04cf90c847508ccddadf6d97c0280527aa4506 [file] [log] [blame]
/*
* 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/futex.h> /* for FUTEX_WAIT */
#include <asm/uaccess.h>
int get_compat_timespec(struct timespec *ts, struct compat_timespec *cts)
{
return (verify_area(VERIFY_READ, cts, sizeof(*cts)) ||
__get_user(ts->tv_sec, &cts->tv_sec) ||
__get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
}
int put_compat_timespec(struct timespec *ts, struct compat_timespec *cts)
{
return (verify_area(VERIFY_WRITE, cts, sizeof(*cts)) ||
__put_user(ts->tv_sec, &cts->tv_sec) ||
__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
}
static long compat_nanosleep_restart(struct restart_block *restart)
{
unsigned long expire = restart->arg0, now = jiffies;
struct compat_timespec *rmtp;
/* Did it expire while we handled signals? */
if (!time_after(expire, now))
return 0;
current->state = TASK_INTERRUPTIBLE;
expire = schedule_timeout(expire - now);
if (expire == 0)
return 0;
rmtp = (struct compat_timespec *)restart->arg1;
if (rmtp) {
struct compat_timespec ct;
struct timespec t;
jiffies_to_timespec(expire, &t);
ct.tv_sec = t.tv_sec;
ct.tv_nsec = t.tv_nsec;
if (copy_to_user(rmtp, &ct, sizeof(ct)))
return -EFAULT;
}
/* The 'restart' block is already filled in */
return -ERESTART_RESTARTBLOCK;
}
asmlinkage long compat_sys_nanosleep(struct compat_timespec *rqtp,
struct compat_timespec *rmtp)
{
struct timespec t;
struct restart_block *restart;
unsigned long expire;
if (get_compat_timespec(&t, rqtp))
return -EFAULT;
if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
return -EINVAL;
expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
current->state = TASK_INTERRUPTIBLE;
expire = schedule_timeout(expire);
if (expire == 0)
return 0;
if (rmtp) {
jiffies_to_timespec(expire, &t);
if (put_compat_timespec(&t, rmtp))
return -EFAULT;
}
restart = &current_thread_info()->restart_block;
restart->fn = compat_nanosleep_restart;
restart->arg0 = jiffies + expire;
restart->arg1 = (unsigned long) rmtp;
return -ERESTART_RESTARTBLOCK;
}
static inline long get_compat_itimerval(struct itimerval *o,
struct compat_itimerval *i)
{
return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
__get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
__get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
__get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
}
static inline long put_compat_itimerval(struct compat_itimerval *o,
struct itimerval *i)
{
return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
__put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
__put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
__put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
}
extern int do_getitimer(int which, struct itimerval *value);
asmlinkage long compat_sys_getitimer(int which, struct compat_itimerval *it)
{
struct itimerval kit;
int error;
error = do_getitimer(which, &kit);
if (!error && put_compat_itimerval(it, &kit))
error = -EFAULT;
return error;
}
extern int do_setitimer(int which, struct itimerval *, struct itimerval *);
asmlinkage long compat_sys_setitimer(int which, struct compat_itimerval *in,
struct compat_itimerval *out)
{
struct itimerval kin, kout;
int error;
if (in) {
if (get_compat_itimerval(&kin, in))
return -EFAULT;
} else
memset(&kin, 0, sizeof(kin));
error = do_setitimer(which, &kin, out ? &kout : NULL);
if (error || !out)
return error;
if (put_compat_itimerval(out, &kout))
return -EFAULT;
return 0;
}
asmlinkage long compat_sys_times(struct compat_tms *tbuf)
{
/*
* In the SMP world we might just be unlucky and have one of
* the times increment as we use it. Since the value is an
* atomically safe type this is just fine. Conceptually its
* as if the syscall took an instant longer to occur.
*/
if (tbuf) {
struct compat_tms tmp;
tmp.tms_utime = compat_jiffies_to_clock_t(current->utime);
tmp.tms_stime = compat_jiffies_to_clock_t(current->stime);
tmp.tms_cutime = compat_jiffies_to_clock_t(current->cutime);
tmp.tms_cstime = compat_jiffies_to_clock_t(current->cstime);
if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
return -EFAULT;
}
return compat_jiffies_to_clock_t(jiffies);
}
/*
* Assumption: old_sigset_t and compat_old_sigset_t are both
* types that can be passed to put_user()/get_user().
*/
extern asmlinkage long sys_sigpending(old_sigset_t *);
asmlinkage long compat_sys_sigpending(compat_old_sigset_t *set)
{
old_sigset_t s;
long ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_sigpending(&s);
set_fs(old_fs);
if (ret == 0)
ret = put_user(s, set);
return ret;
}
extern asmlinkage long sys_sigprocmask(int, old_sigset_t *, old_sigset_t *);
asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t *set,
compat_old_sigset_t *oset)
{
old_sigset_t s;
long ret;
mm_segment_t old_fs;
if (set && get_user(s, set))
return -EFAULT;
old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_sigprocmask(how, set ? &s : NULL, oset ? &s : NULL);
set_fs(old_fs);
if (ret == 0)
ret = put_user(s, oset);
return ret;
}
extern long do_futex(unsigned long, int, int, unsigned long);
asmlinkage long compat_sys_futex(u32 *uaddr, int op, int val,
struct compat_timespec *utime)
{
struct timespec t;
unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
if ((op == FUTEX_WAIT) && utime) {
if (get_compat_timespec(&t, utime))
return -EFAULT;
timeout = timespec_to_jiffies(&t) + 1;
}
return do_futex((unsigned long)uaddr, op, val, timeout);
}