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130 lines
4.1 KiB
C
130 lines
4.1 KiB
C
/* prmcxci3.c: MUTATOR CONTEXT (macOS, IA-32)
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*
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* $Id$
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* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
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*
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* .purpose: Implement the mutator context module. <design/prmc>.
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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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*
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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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#include "prmcxc.h"
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#include "prmci3.h"
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SRCID(prmcxci3, "$Id$");
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#if !defined(MPS_OS_XC) || !defined(MPS_ARCH_I3)
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#error "prmcxci3.c is specific to MPS_OS_XC and MPS_ARCH_I3"
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#endif
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/* Prmci3AddressHoldingReg -- return an address of a register in a context */
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MRef Prmci3AddressHoldingReg(MutatorContext context, unsigned int regnum)
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{
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THREAD_STATE_S *threadState;
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AVERT(MutatorContext, context);
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AVER(NONNEGATIVE(regnum));
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AVER(regnum <= 7);
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threadState = context->threadState;
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/* .source.i486 */
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/* .assume.regref */
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/* The register numbers (REG_EAX etc.) are defined in <ucontext.h>
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but only if _GNU_SOURCE is defined: see .feature.li in
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config.h. */
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/* TODO: The current arrangement of the fix operation (taking a Ref *)
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forces us to pun these registers (actually `int` on LII3GC). We can
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suppress the warning by casting through `void *` and this might make
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it safe, but does it really? RB 2012-09-10 */
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switch (regnum) {
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case 0: return (void *)&threadState->__eax;
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case 1: return (void *)&threadState->__ecx;
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case 2: return (void *)&threadState->__edx;
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case 3: return (void *)&threadState->__ebx;
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case 4: return (void *)&threadState->__esp;
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case 5: return (void *)&threadState->__ebp;
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case 6: return (void *)&threadState->__esi;
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case 7: return (void *)&threadState->__edi;
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default:
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NOTREACHED;
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return NULL; /* Avoids compiler warning. */
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}
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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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MutatorContext context)
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{
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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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*faultmemReturn = (MRef)context->address;
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*insvecReturn = (Byte*)context->threadState->__eip;
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}
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/* Prmci3StepOverIns -- modify context to step over instruction */
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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(0 < inslen);
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context->threadState->__eip += (Word)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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return (Addr)context->threadState->__esp;
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2020 Ravenbrook Limited <http://www.ravenbrook.com/>.
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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
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* distribution.
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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 AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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