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This change will be integrated but ignored (-ay) to the gg-epcore/union sources, so that they retain HopeNames. Copied from Perforce Change: 24911 ServerID: perforce.ravenbrook.com
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/* impl.c.protli: PROTECTION FOR LINUX
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*
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* $Id$
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* Copyright (c) 2001 Ravenbrook Limited.
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*
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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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