0cde66af78
Use proper method to access userspace. For now, only the slow copyout path is implemented. Reported and tested by: tijl (previous version) Sponsored by: The FreeBSD Foundation
179 lines
4.1 KiB
C
179 lines
4.1 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2018 The FreeBSD Foundation
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
|
|
* under sponsorship from the FreeBSD Foundation.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_compat.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/imgact.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/sx.h>
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <vm/pmap.h>
|
|
|
|
#include <machine/atomic.h>
|
|
#include <machine/md_var.h>
|
|
|
|
#include <compat/linux/linux_emul.h>
|
|
#include <compat/linux/linux_futex.h>
|
|
|
|
struct futex_st0 {
|
|
int oparg;
|
|
int *oldval;
|
|
};
|
|
|
|
static void
|
|
futex_xchgl_slow0(vm_offset_t kva, void *arg)
|
|
{
|
|
struct futex_st0 *st;
|
|
|
|
st = arg;
|
|
*st->oldval = atomic_swap_int((int *)kva, st->oparg);
|
|
}
|
|
|
|
int
|
|
futex_xchgl(int oparg, uint32_t *uaddr, int *oldval)
|
|
{
|
|
struct futex_st0 st;
|
|
|
|
st.oparg = oparg;
|
|
st.oldval = oldval;
|
|
if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
|
|
futex_xchgl_slow0, &st) != 0)
|
|
return (-EFAULT);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
futex_addl_slow0(vm_offset_t kva, void *arg)
|
|
{
|
|
struct futex_st0 *st;
|
|
|
|
st = arg;
|
|
*st->oldval = atomic_fetchadd_int((int *)kva, st->oparg);
|
|
}
|
|
|
|
int
|
|
futex_addl(int oparg, uint32_t *uaddr, int *oldval)
|
|
{
|
|
struct futex_st0 st;
|
|
|
|
st.oparg = oparg;
|
|
st.oldval = oldval;
|
|
if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
|
|
futex_addl_slow0, &st) != 0)
|
|
return (-EFAULT);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
futex_orl_slow0(vm_offset_t kva, void *arg)
|
|
{
|
|
struct futex_st0 *st;
|
|
int old;
|
|
|
|
st = arg;
|
|
old = *(int *)kva;
|
|
while (!atomic_fcmpset_int((int *)kva, &old, old | st->oparg))
|
|
;
|
|
*st->oldval = old;
|
|
}
|
|
|
|
int
|
|
futex_orl(int oparg, uint32_t *uaddr, int *oldval)
|
|
{
|
|
struct futex_st0 st;
|
|
|
|
st.oparg = oparg;
|
|
st.oldval = oldval;
|
|
if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
|
|
futex_orl_slow0, &st) != 0)
|
|
return (-EFAULT);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
futex_andl_slow0(vm_offset_t kva, void *arg)
|
|
{
|
|
struct futex_st0 *st;
|
|
int old;
|
|
|
|
st = arg;
|
|
old = *(int *)kva;
|
|
while (!atomic_fcmpset_int((int *)kva, &old, old & st->oparg))
|
|
;
|
|
*st->oldval = old;
|
|
}
|
|
|
|
int
|
|
futex_andl(int oparg, uint32_t *uaddr, int *oldval)
|
|
{
|
|
struct futex_st0 st;
|
|
|
|
st.oparg = oparg;
|
|
st.oldval = oldval;
|
|
if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
|
|
futex_andl_slow0, &st) != 0)
|
|
return (-EFAULT);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
futex_xorl_slow0(vm_offset_t kva, void *arg)
|
|
{
|
|
struct futex_st0 *st;
|
|
int old;
|
|
|
|
st = arg;
|
|
old = *(int *)kva;
|
|
while (!atomic_fcmpset_int((int *)kva, &old, old ^ st->oparg))
|
|
;
|
|
*st->oldval = old;
|
|
}
|
|
|
|
int
|
|
futex_xorl(int oparg, uint32_t *uaddr, int *oldval)
|
|
{
|
|
struct futex_st0 st;
|
|
|
|
st.oparg = oparg;
|
|
st.oldval = oldval;
|
|
if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
|
|
futex_xorl_slow0, &st) != 0)
|
|
return (-EFAULT);
|
|
return (0);
|
|
}
|