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New function ProtGranularity returns the protection granularity of the operating system. (On all currently supported operating systems this is the same as the granularity of memory mapping returned by VMPageSuze, but it's important to separate these concepts.) MPMCheck asserts that the granularity of memory mapping is a multiple of the granularity of protection. Client arena supports MPS_KEY_ARENA_GRAIN_SIZE. Some of the test cases set the arena grain size. Copied from Perforce Change: 186588 ServerID: perforce.ravenbrook.com
114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/* protan.c: ANSI MEMORY PROTECTION
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*
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* $Id$
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* Copyright (c) 2001-2014 Ravenbrook Limited. See end of file for license.
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*
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*
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* DESIGN
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*
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* <design/protan/>
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*/
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#include "mpm.h"
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SRCID(protan, "$Id$");
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/* ProtSetup -- global protection setup */
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void ProtSetup(void)
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{
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NOOP;
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}
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/* ProtGranularity -- return the granularity of protection */
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Size ProtGranularity(void)
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{
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/* Any range of addresses can be "protected" since ProtSet does nothing. */
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return (Size)MPS_PF_ALIGN;
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}
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/* ProtSet -- set the protection for a page */
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void ProtSet(Addr base, Addr limit, AccessSet pm)
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{
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AVER(base < limit);
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/* .improve.protset.check: There is nor AccessSetCheck, so we */
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/* don't check it. */
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UNUSED(pm);
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NOOP;
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}
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/* ProtSync -- synchronize protection settings with hardware
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*
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* See <design/protan/#fun.sync>.
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*/
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void ProtSync(Arena arena)
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{
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Bool synced;
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AVERT(Arena, arena);
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do {
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Seg seg;
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synced = TRUE;
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if (SegFirst(&seg, arena)) {
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do {
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if (SegPM(seg) != AccessSetEMPTY) { /* <design/protan/#fun.sync.seg> */
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ShieldEnter(arena);
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TraceSegAccess(arena, seg, SegPM(seg));
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ShieldLeave(arena);
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synced = FALSE;
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}
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} while(SegNext(&seg, arena, seg));
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}
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} while(!synced);
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2014 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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