58 lines
2.1 KiB
Groff
58 lines
2.1 KiB
Groff
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.\"
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.\" Copyright (c) 2020 Leandro Lupori <luporl@FreeBSD.org>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 5, 2020
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.Dt KVM_KERNDISP 3
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.Os
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.Sh NAME
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.Nm kvm_kerndisp
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.Nd get kernel displacement
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.Sh LIBRARY
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.Lb libkvm
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.Sh SYNOPSIS
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.In kvm.h
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.Ft kssize_t
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.Fn kvm_kerndisp "kvm_t *kd"
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.Sh DESCRIPTION
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.Fn kvm_kerndisp
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returns the number of bytes by which the kernel referenced by
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.Fa kd
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is displaced.
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This is the difference between the kernel's base virtual address at run time
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and the kernel base virtual address specified in the kernel image file.
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.Pp
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Note that if the kernel is moved to a lower memory address,
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the displacement will be negative.
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.Sh RETURN VALUES
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.Fn kvm_kerndisp
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returns the number of bytes by which the kernel is displaced.
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If the kernel is not displaced or if it is not possible to find the
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displacement then 0 is returned.
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.Sh SEE ALSO
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.Xr kvm 3 ,
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.Xr kvm_close 3 ,
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.Xr kvm_open 3
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