The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux_copyout.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2018 The FreeBSD Foundation
    5  * All rights reserved.
    6  *
    7  * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
    8  * under sponsorship from the FreeBSD Foundation.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include "opt_compat.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/imgact.h>
   40 #include <sys/lock.h>
   41 #include <sys/sx.h>
   42 #include <vm/vm.h>
   43 #include <vm/vm_param.h>
   44 #include <vm/vm_extern.h>
   45 #include <vm/pmap.h>
   46 
   47 #include <machine/atomic.h>
   48 #include <machine/md_var.h>
   49 
   50 #include <compat/linux/linux_emul.h>
   51 #include <compat/linux/linux_futex.h>
   52 
   53 struct futex_st0 {
   54         int oparg;
   55         int *oldval;
   56 };
   57 
   58 static void
   59 futex_xchgl_slow0(vm_offset_t kva, void *arg)
   60 {
   61         struct futex_st0 *st;
   62 
   63         st = arg;
   64         *st->oldval = atomic_swap_int((int *)kva, st->oparg);
   65 }
   66 
   67 int
   68 futex_xchgl(int oparg, uint32_t *uaddr, int *oldval)
   69 {
   70         struct futex_st0 st;
   71 
   72         st.oparg = oparg;
   73         st.oldval = oldval;
   74         if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
   75             futex_xchgl_slow0, &st) != 0)
   76                 return (-EFAULT);
   77         return (0);
   78 }
   79 
   80 static void
   81 futex_addl_slow0(vm_offset_t kva, void *arg)
   82 {
   83         struct futex_st0 *st;
   84 
   85         st = arg;
   86         *st->oldval = atomic_fetchadd_int((int *)kva, st->oparg);
   87 }
   88 
   89 int
   90 futex_addl(int oparg, uint32_t *uaddr, int *oldval)
   91 {
   92         struct futex_st0 st;
   93 
   94         st.oparg = oparg;
   95         st.oldval = oldval;
   96         if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
   97             futex_addl_slow0, &st) != 0)
   98                 return (-EFAULT);
   99         return (0);
  100 }
  101 
  102 static void
  103 futex_orl_slow0(vm_offset_t kva, void *arg)
  104 {
  105         struct futex_st0 *st;
  106         int old;
  107 
  108         st = arg;
  109         old = *(int *)kva;
  110         while (!atomic_fcmpset_int((int *)kva, &old, old | st->oparg))
  111                 ;
  112         *st->oldval = old;
  113 }
  114 
  115 int
  116 futex_orl(int oparg, uint32_t *uaddr, int *oldval)
  117 {
  118         struct futex_st0 st;
  119 
  120         st.oparg = oparg;
  121         st.oldval = oldval;
  122         if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
  123             futex_orl_slow0, &st) != 0)
  124                 return (-EFAULT);
  125         return (0);
  126 }
  127 
  128 static void
  129 futex_andl_slow0(vm_offset_t kva, void *arg)
  130 {
  131         struct futex_st0 *st;
  132         int old;
  133 
  134         st = arg;
  135         old = *(int *)kva;
  136         while (!atomic_fcmpset_int((int *)kva, &old, old & st->oparg))
  137                 ;
  138         *st->oldval = old;
  139 }
  140 
  141 int
  142 futex_andl(int oparg, uint32_t *uaddr, int *oldval)
  143 {
  144         struct futex_st0 st;
  145 
  146         st.oparg = oparg;
  147         st.oldval = oldval;
  148         if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
  149             futex_andl_slow0, &st) != 0)
  150                 return (-EFAULT);
  151         return (0);
  152 }
  153 
  154 static void
  155 futex_xorl_slow0(vm_offset_t kva, void *arg)
  156 {
  157         struct futex_st0 *st;
  158         int old;
  159 
  160         st = arg;
  161         old = *(int *)kva;
  162         while (!atomic_fcmpset_int((int *)kva, &old, old ^ st->oparg))
  163                 ;
  164         *st->oldval = old;
  165 }
  166 
  167 int
  168 futex_xorl(int oparg, uint32_t *uaddr, int *oldval)
  169 {
  170         struct futex_st0 st;
  171 
  172         st.oparg = oparg;
  173         st.oldval = oldval;
  174         if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
  175             futex_xorl_slow0, &st) != 0)
  176                 return (-EFAULT);
  177         return (0);
  178 }

Cache object: f3137e196d2a4451dda3ef55dc888e99


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