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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
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/* impl.c.prmci3li: PROTECTION MUTATOR CONTEXT INTEL 386 (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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* .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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*
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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
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*
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* .source.linux.kernel: Linux kernel source files.
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*
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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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/* prmcli.h will include mpm.h after defining open sesame magic */
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#include "prmcli.h"
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#include "prmci3.h"
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SRCID(prmci3li, "$Id$");
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/* Prmci3AddressHoldingReg -- return an address of a register in a context */
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MRef Prmci3AddressHoldingReg(MutatorFaultContext context, unsigned int regnum)
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{
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struct sigcontext *scp;
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AVER(regnum <= 7);
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AVER(regnum >= 0);
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scp = context->scp;
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/* .source.i486 */
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/* .assume.regref */
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switch (regnum) {
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case 0: return (MRef)&scp->eax;
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case 1: return (MRef)&scp->ecx;
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case 2: return (MRef)&scp->edx;
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case 3: return (MRef)&scp->ebx;
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case 4: return (MRef)&scp->esp;
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case 5: return (MRef)&scp->ebp;
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case 6: return (MRef)&scp->esi;
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case 7: return (MRef)&scp->edi;
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}
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NOTREACHED;
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return (MRef)NULL; /* Keep compiler happy. */
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}
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/* Prmci3DecodeFaultContext -- decode fault to find faulting address and IP */
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void Prmci3DecodeFaultContext(MRef *faultmemReturn,
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Byte **insvecReturn,
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MutatorFaultContext context)
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{
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struct sigcontext *scp;
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scp = context->scp;
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/* Assert that this is a page fault exception. The computation of */
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/* faultmem depends on this. See .source.i486 (9.9.14). */
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AVER(scp->trapno == 14);
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/* cr2 contains the address which caused the fault. */
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/* See .source.i486 (9.9.14) and */
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/* .source.linux.kernel (linux/arch/i386/mm/fault.c). */
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*faultmemReturn = (MRef)scp->cr2;
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*insvecReturn = (Byte*)scp->eip;
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}
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/* Prmci3StepOverIns -- modify context to step over instruction */
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void Prmci3StepOverIns(MutatorFaultContext context, Size inslen)
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{
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context->scp->eip += (unsigned long)inslen;
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}
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