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      1 /*	$NetBSD: netbsd32_futex.c,v 1.1 2020/04/26 18:53:33 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2019 The NetBSD Foundation.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell and Jason R. Thorpe.
      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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: netbsd32_futex.c,v 1.1 2020/04/26 18:53:33 thorpej Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/param.h>
     37 #include <sys/systm.h>
     38 #include <sys/proc.h>
     39 #include <sys/lwp.h>
     40 #include <sys/syscallargs.h>
     41 #include <sys/futex.h>
     42 
     43 #include <compat/netbsd32/netbsd32.h>
     44 #include <compat/netbsd32/netbsd32_syscallargs.h>
     45 #include <compat/netbsd32/netbsd32_conv.h>
     46 
     47 /* Sycalls conversion */
     48 
     49 int
     50 netbsd32___futex(struct lwp *l, const struct netbsd32___futex_args *uap,
     51     register_t *retval)
     52 {
     53 	/* {
     54 		syscallarg(netbsd32_intp) uaddr;
     55 		syscallarg(int) op;
     56 		syscallarg(int) val;
     57 		syscallarg(netbsd32_timespecp_t) timeout;
     58 		syscallarg(netbsd32_intp) uaddr2;
     59 		syscallarg(int) val2;
     60 		syscallarg(int) val3;
     61 	} */
     62 	struct netbsd32_timespec ts32;
     63 	struct timespec ts, *tsp;
     64 	int error;
     65 
     66 	/*
     67 	 * Copy in the timeout argument, if specified.
     68 	 */
     69 	if (SCARG_P32(uap, timeout)) {
     70 		error = copyin(SCARG_P32(uap, timeout), &ts32, sizeof(ts32));
     71 		if (error)
     72 			return error;
     73 		netbsd32_to_timespec(&ts32, &ts);
     74 		tsp = &ts;
     75 	} else {
     76 		tsp = NULL;
     77 	}
     78 
     79 	return do_futex(SCARG_P32(uap, uaddr), SCARG(uap, op),
     80 	    SCARG(uap, val), tsp, SCARG_P32(uap, uaddr2), SCARG(uap, val2),
     81 	    SCARG(uap, val3), retval);
     82 }
     83 
     84 int
     85 netbsd32___futex_set_robust_list(struct lwp *l,
     86     const struct netbsd32___futex_set_robust_list_args *uap, register_t *retval)
     87 {
     88 	/* {
     89 		syscallarg(netbsd32_voidp) head;
     90 		syscallarg(netbsd32_size_t) len;
     91 	} */
     92 	void *head = SCARG_P32(uap, head);
     93 
     94 	if (SCARG(uap, len) != _FUTEX_ROBUST_HEAD_SIZE32)
     95 		return EINVAL;
     96 	if ((uintptr_t)head % sizeof(uint32_t))
     97 		return EINVAL;
     98 
     99 	l->l_robust_head = (uintptr_t)head;
    100 
    101 	return 0;
    102 }
    103 
    104 int
    105 netbsd32___futex_get_robust_list(struct lwp *l,
    106     const struct netbsd32___futex_get_robust_list_args *uap, register_t *retval)
    107 {
    108 	/* {
    109 		syscallarg(lwpid_t) lwpid;
    110 		syscallarg(netbsd32_voidp) headp;
    111 		syscallarg(netbsd32_size_tp) lenp;
    112 	} */
    113 	void *head;
    114 	const netbsd32_size_t len = _FUTEX_ROBUST_HEAD_SIZE32;
    115 	netbsd32_voidp head32;
    116 	int error;
    117 
    118 	error = futex_robust_head_lookup(l, SCARG(uap, lwpid), &head);
    119 	if (error)
    120 		return error;
    121 
    122 	head32.i32 = (uintptr_t)head;
    123 	if (NETBSD32PTR64(head32) != head)
    124 		return EFAULT;
    125 
    126 	/* Copy out the head pointer and the head structure length. */
    127 	/* (N.B.: "headp" is actually a "void **". */
    128 	error = copyout(&head32, SCARG_P32(uap, headp), sizeof(head32));
    129 	if (__predict_true(error == 0)) {
    130 		error = copyout(&len, SCARG_P32(uap, lenp), sizeof(len));
    131 	}
    132 
    133 	return error;
    134 }
    135