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1a04431cff
Implement MutatorContextCheck on Windows. Add AVERT(MutatorContext, context) in PoolAccess and other functions. Document initialization functions MutatorContextInitFault and MutatorContextInitThread and implement them on Windows. Add a union discriminator to MutatorContextStruct on Windows so that we don't accidentally try to get the stack pointer from a fault context, or the exception address from a thread context. Copied from Perforce Change: 192567 ServerID: perforce.ravenbrook.com
147 lines
4.9 KiB
C
147 lines
4.9 KiB
C
/* prmcw3i3.c: MUTATOR CONTEXT INTEL 386 (Windows)
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*
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* $Id$
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* Copyright (c) 2001-2016 Ravenbrook Limited. See end of file for license.
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*
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* PURPOSE
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*
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* .purpose: Implement the mutator context module. See <design/prmc/>.
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*
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* SOURCES
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*
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* .source.i486: Intel486 Microprocessor Family Programmer's
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* Reference Manual (book.intel92).
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*
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* ASSUMPTIONS
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*
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* .assume.regref: The registers in the context can be modified by
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* storing into an MRef pointer.
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*
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* .assume.sp: The stack pointer is stored in CONTEXT.Esp. This
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* requires CONTEXT_CONTROL to be set in ContextFlags when
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* GetThreadContext is called (see <code/prmcw3.c>).
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*/
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#include "prmcw3.h"
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#include "prmci3.h"
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#include "mpm.h"
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SRCID(prmcw3i3, "$Id$");
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#if !defined(MPS_OS_W3) || !defined(MPS_ARCH_I3)
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#error "prmcw3i3.c is specific to MPS_OS_W3 and MPS_ARCH_I3"
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#endif
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/* Prmci3AddressHoldingReg -- Return an address for a given machine register */
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MRef Prmci3AddressHoldingReg(MutatorContext context, unsigned int regnum)
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{
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PCONTEXT wincont;
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AVERT(MutatorContext, context);
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AVER(context->var == MutatorContextFAULT);
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AVER(NONNEGATIVE(regnum));
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AVER(regnum <= 7);
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wincont = context->the.ep->ContextRecord;
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switch (regnum) {
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case 0: return (MRef)&wincont->Eax;
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case 1: return (MRef)&wincont->Ecx;
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case 2: return (MRef)&wincont->Edx;
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case 3: return (MRef)&wincont->Ebx;
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case 4: return (MRef)&wincont->Esp;
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case 5: return (MRef)&wincont->Ebp;
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case 6: return (MRef)&wincont->Esi;
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case 7: return (MRef)&wincont->Edi;
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default:
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NOTREACHED;
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return NULL; /* suppress warning */
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}
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}
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/* Prmci3DecodeFaultContext -- decode fault context */
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void Prmci3DecodeFaultContext(MRef *faultmemReturn, Byte **insvecReturn,
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MutatorContext context)
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{
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LPEXCEPTION_RECORD er;
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AVER(faultmemReturn != NULL);
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AVER(insvecReturn != NULL);
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AVERT(MutatorContext, context);
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AVER(context->var == MutatorContextFAULT);
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er = context->the.ep->ExceptionRecord;
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/* Assert that this is an access violation. The computation of */
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/* faultmemReturn depends on this. */
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AVER(er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION);
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*faultmemReturn = (MRef)er->ExceptionInformation[1];
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*insvecReturn = (Byte*)context->the.ep->ContextRecord->Eip;
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}
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/* Prmci3StepOverIns -- skip an instruction by changing the context */
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void Prmci3StepOverIns(MutatorContext context, Size inslen)
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{
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AVERT(MutatorContext, context);
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AVER(context->var == MutatorContextFAULT);
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context->the.ep->ContextRecord->Eip += (DWORD)inslen;
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}
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Addr MutatorContextSP(MutatorContext context)
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{
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AVERT(MutatorContext, context);
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AVER(context->var == MutatorContextTHREAD);
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return (Addr)context->the.context.Esp; /* .assume.sp */
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2016 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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