1.\" 2.\" Copyright (c) 2020 Leandro Lupori <luporl@FreeBSD.org> 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd February 5, 2020 26.Dt KVM_KERNDISP 3 27.Os 28.Sh NAME 29.Nm kvm_kerndisp 30.Nd get kernel displacement 31.Sh LIBRARY 32.Lb libkvm 33.Sh SYNOPSIS 34.In kvm.h 35.Ft kssize_t 36.Fn kvm_kerndisp "kvm_t *kd" 37.Sh DESCRIPTION 38.Fn kvm_kerndisp 39returns the number of bytes by which the kernel referenced by 40.Fa kd 41is displaced. 42This is the difference between the kernel's base virtual address at run time 43and the kernel base virtual address specified in the kernel image file. 44.Pp 45Note that if the kernel is moved to a lower memory address, 46the displacement will be negative. 47.Sh RETURN VALUES 48.Fn kvm_kerndisp 49returns the number of bytes by which the kernel is displaced. 50If the kernel is not displaced or if it is not possible to find the 51displacement then 0 is returned. 52.Sh SEE ALSO 53.Xr kvm 3 , 54.Xr kvm_close 3 , 55.Xr kvm_open 3 56