WINE/user LDT support from John Brezak, ported to FreeBSD by Jeffrey Hsu
<hsu@soda.berkeley.edu>.
This commit is contained in:
David Greenman
parent
da59a31c01
commit
bda9cd29f2
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=1052
9
lib/libc/amd64/sys/Makefile.inc
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9
lib/libc/amd64/sys/Makefile.inc
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# Makefile.inc,v 1.1 1993/09/03 19:04:23 jtc Exp
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.PATH: ${.CURDIR}/${MACHINE}/sys
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SRCS+= i386_get_ldt.c i386_set_ldt.c
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MAN2+= i386/sys/i386_get_ldt.2
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MLINKS+=i386_get_ldt.2 i386_set_ldt.2
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9
lib/libc/i386/sys/Makefile.inc
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lib/libc/i386/sys/Makefile.inc
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# Makefile.inc,v 1.1 1993/09/03 19:04:23 jtc Exp
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.PATH: ${.CURDIR}/${MACHINE}/sys
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SRCS+= i386_get_ldt.c i386_set_ldt.c
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MAN2+= i386/sys/i386_get_ldt.2
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MLINKS+=i386_get_ldt.2 i386_set_ldt.2
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98
lib/libc/i386/sys/i386_get_ldt.2
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lib/libc/i386/sys/i386_get_ldt.2
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.\" Copyright (c) 1980, 1991 Regents of the University of California.
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.\" All rights reserved.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" from: @(#)fork.2 6.5 (Berkeley) 3/10/91
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.\" $Id: i386_get_ldt.2,v 1.2 1993/10/09 00:59:10 cgd Exp $
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.\"
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.Dd September 20, 1993
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.Dt I386_GET_LDT 2
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.Os FreeBSD
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.Sh NAME
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.Nm i386_get_ldt ,
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.Nm i386_set_ldt
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.Nd manage i386 per-process Local Descriptor Table entries
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.Sh SYNOPSIS
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.Fd #include <machine/segments.h>
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.Fd #include <machine/sysarch.h>
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.Ft int
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.Fn i386_get_ldt "int start_sel" "union descriptor *descs" "int num_sels"
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.Ft int
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.Fn i386_set_ldt "int start_sel" "union descriptor *descs" "int num_sels"
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.Sh DESCRIPTION
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.Fn i386_get_ldt
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will return the list of i386 descriptors that the process has in its
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LDT.
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.Fn i386_set_ldt
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will set a list of i386 descriptors for the current process in its
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LDT.
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Both routines accept a starting selector number
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.Fa start_sel
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, an array of memory that
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will contain the descriptors to be set or returned
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.Fa descs
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, and the number of entries to set or return
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.Fa num_sels .
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.Pp
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The argument
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.Fa descs
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can be either segment_descriptor or gate_descriptor and are defined in
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.Fd <i386/segments.h> .
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These structures are defined by the architecure
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as disjoint bit-fields, so care must be taken in constructing them.
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.Sh RETURN VALUES
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Upon successful completion,
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.Fn i386_get_ldt
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returns the number of descriptors currently in the LDT.
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.Fn i386_set_ldt
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returns the first selector set.
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Otherwise, a value of -1 is returned and the global
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variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn i386_get_ldt
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and
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.Fn i386_set_ldt
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will fail if:
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.Bl -tag -width [EINVAL]
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.It Bq Er EINVAL
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An inappropriate parameter was used for
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.Fa start_sel
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or
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.Fa num_sels .
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.It Bq Er EACESS
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The caller attempted to use a descriptor that would
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circumvent protection or cause a failure.
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.El
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.Sh REFERENCES
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i386 Microprocessor Programmer's Reference Manual, Intel
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.Sh WARNING
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You can really hose your process using this.
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50
lib/libc/i386/sys/i386_get_ldt.c
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50
lib/libc/i386/sys/i386_get_ldt.c
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/*
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* Copyright (c) 1993 John Brezak
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* All rights reserved.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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#include <machine/segments.h>
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#include <machine/sysarch.h>
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struct parms {
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int start;
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union descriptor *descs;
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int num;
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};
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int
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i386_get_ldt(int start, union descriptor *descs, int num)
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{
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struct parms p;
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p.start = start;
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p.descs = descs;
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p.num = num;
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return sysarch(I386_GET_LDT, (char *)&p);
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}
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50
lib/libc/i386/sys/i386_set_ldt.c
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50
lib/libc/i386/sys/i386_set_ldt.c
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/*
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* Copyright (c) 1993 John Brezak
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* All rights reserved.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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#include <machine/segments.h>
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#include <machine/sysarch.h>
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struct parms {
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int start;
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union descriptor *descs;
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int num;
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};
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int
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i386_set_ldt(int start, union descriptor *descs, int num)
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{
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struct parms p;
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p.start = start;
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p.descs = descs;
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p.num = num;
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return sysarch(I386_SET_LDT, (char *)&p);
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}
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