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+.\"	$NetBSD: ufetch.9,v 1.1 2019/04/06 03:06:24 thorpej Exp $
+.\"
+.\" Copyright (c) 2019 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jason R. Thorpe.
+.\"
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd March 18, 2019
+.Dt UFETCH 9
+.Os
+.Sh NAME
+.Nm ufetch ,
+.Nm ufetch_8 ,
+.Nm ufetch_16 ,
+.Nm ufetch_32 ,
+.Nm ufetch_64 ,
+.Nm ufetch_char ,
+.Nm ufetch_short ,
+.Nm ufetch_int ,
+.Nm ufetch_long ,
+.Nm ufetch_ptr
+.Nd fetch data from user-space
+.Sh SYNOPSIS
+.In sys/systm.h
+.Ft int
+.Fn ufetch_8 "const uint8_t *uaddr" "uint8_t *valp"
+.Ft int
+.Fn ufetch_16 "const uint16_t *uaddr" "uint16_t *valp"
+.Ft int
+.Fn ufetch_32 "const uint32_t *uaddr" "uint32_t *valp"
+.Ft int
+.Fn ufetch_64 "const uint64_t *uaddr" "uint64_t *valp"
+.Ft int
+.Fn ufetch_char "const unsigned char *uaddr" "unsigned char *valp"
+.Ft int
+.Fn ufetch_short "const unsigned short *uaddr" "unsigned short *valp"
+.Ft int
+.Fn ufetch_int "const unsigned int *uaddr" "unsigned int *valp"
+.Ft int
+.Fn ufetch_long "const unsigned long *uaddr" "unsigned long *valp"
+.Ft int
+.Fn ufetch_ptr "const void **uaddr" "void **valp"
+.Sh DESCRIPTION
+The
+.Nm
+functions provide a way to fetch the values of single memory cells from
+user-space.
+In each case, the value referenced by the user-space address
+.Ar uaddr
+is retrieved and stored at the kernel memory location referenced by
+.Ar valp .
+.Pp
+The
+.Nm ufetch_64
+function is only available on systems employing the
+.Sq LP64
+memory model, which can be determined by testing for the presence of the
+.Dv _LP64
+C preprocessor macro.
+.Sh RETURN VALUES
+The
+.Nm
+functions return 0 on success and an error number on failure.
+.Sh SEE ALSO
+.Xr copy 9 ,
+.Xr ustore 9