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e854cd8e1d
Making some new files consistent with changes from that branch. Deleting some new Global Graphics confidential files. Copied from Perforce Change: 30256 ServerID: perforce.ravenbrook.com
131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/* protli.c: PROTECTION FOR LINUX
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*
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* $Id$
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* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
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*/
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#include "mpm.h"
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#ifndef MPS_OS_LI
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#error "protli.c is Linux specific, but MPS_OS_LI is not set"
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#endif
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#ifndef PROTECTION
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#error "protli.c implements protection, but PROTECTION is not set"
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#endif
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#include <limits.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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SRCID(protli, "$Id$");
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/* ProtSet -- set protection
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*
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* This is just a thin veneer on top of mprotect(2).
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*/
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void ProtSet(Addr base, Addr limit, AccessSet mode)
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{
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int flags;
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int res;
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AVER(sizeof(int) == sizeof(Addr)); /* should be redundant; will fail on Alpha */
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AVER(base < limit);
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AVER(base != 0);
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AVER(AddrOffset(base, limit) <= INT_MAX); /* should be redundant */
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#if 0
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/* .flags.trouble: This less strict version of flags (which allows write
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* access unless explicitly told not to) caused mmqa test 37 to fail.
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* This might be a bug in MPS, so for now we go with the stricter
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* version that matches the Win32 implementation. */
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flags = 0;
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if((mode & AccessREAD) == 0)
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flags |= PROT_READ | PROT_EXEC;
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if((mode & AccessWRITE) == 0)
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flags |= PROT_WRITE;
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#endif
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flags = PROT_READ | PROT_WRITE | PROT_EXEC;
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if((mode & AccessWRITE) != 0)
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flags = PROT_READ | PROT_EXEC;
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if((mode & AccessREAD) != 0)
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flags = 0;
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res = mprotect((void *)base, (size_t)AddrOffset(base, limit), flags);
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AVER(res == 0);
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}
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/* ProtSync -- synchronize protection settings with hardware
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*
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* This does nothing under Linux.
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*/
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void ProtSync(Arena arena)
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{
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NOOP;
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}
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/* ProtTramp -- protection trampoline
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*
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* The protection trampoline is trivial under Linux, as there is nothing
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* that needs to be done in the dynamic context of the mutator in order
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* to catch faults. (Contrast this with Win32 Structured Exception
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* Handling.)
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*/
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void ProtTramp(void **resultReturn, void *(*f)(void *, size_t),
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void *p, size_t s)
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{
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AVER(resultReturn != NULL);
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AVER(FUNCHECK(f));
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/* Can't check p and s as they are interpreted by the client */
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*resultReturn = (*f)(p, s);
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
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* All rights reserved. This is an open source license. Contact
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* Ravenbrook for commercial licensing options.
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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 are
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* met:
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*
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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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*
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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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* 3. Redistributions in any form must be accompanied by information on how
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* to obtain complete source code for this software and any accompanying
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* software that uses this software. The source code must either be
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* included in the distribution or be available for no more than the cost
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* of distribution plus a nominal fee, and must be freely redistributable
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* under reasonable conditions. For an executable file, complete source
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* code means the source code for all modules it contains. It does not
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* include source code for modules or files that typically accompany the
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* major components of the operating system on which the executable file
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* runs.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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