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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
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/* impl.c.prmci3w3: PROTECTION MUTATOR CONTEXT INTEL 386 (Win32)
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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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* PURPOSE
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*
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* .purpose: This module implements the part of the protection module
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* that decodes the MutatorFaultContext.
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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 resisters in the context can be modified by
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* storing into an MRef pointer.
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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(prmci3w3, "$Id$");
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/* Prmci3AddressHoldingReg -- Return an address for a given machine register */
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MRef Prmci3AddressHoldingReg(MutatorFaultContext context, unsigned int regnum)
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{
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PCONTEXT wincont;
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AVER(regnum <= 7);
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AVER(regnum >= 0);
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wincont = context->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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}
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NOTREACHED;
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return NULL; /* suppress warning */
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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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MutatorFaultContext context)
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{
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LPEXCEPTION_RECORD er;
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er = context->ep->ExceptionRecord;
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/* Assert that this is an access violation. The computation of */
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/* faultmem 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->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(MutatorFaultContext context, Size inslen)
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{
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context->ep->ContextRecord->Eip += (DWORD)inslen;
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}
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