89 lines
3.0 KiB
Groff
89 lines
3.0 KiB
Groff
.\" $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
|