e410a925df
Make instructions observe segment prefixes, default segment rules, segment base addresses. Also fix some microcode and add sib and riprel "keywords" to the x86 specialization of the microassembler. --HG-- extra : convert_revision : be5a3b33d33f243ed6e1ad63faea8495e46d0ac9
106 lines
4.8 KiB
C++
106 lines
4.8 KiB
C++
/*
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* Copyright (c) 2007 The Hewlett-Packard Development Company
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* All rights reserved.
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*
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* Redistribution and use of this software in source and binary forms,
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* with or without modification, are permitted provided that the
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* following conditions are met:
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*
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* The software must be used only for Non-Commercial Use which means any
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* use which is NOT directed to receiving any direct monetary
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* compensation for, or commercial advantage from such use. Illustrative
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* examples of non-commercial use are academic research, personal study,
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* teaching, education and corporate research & development.
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* Illustrative examples of commercial use are distributing products for
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* commercial advantage and providing services using the software for
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* commercial advantage.
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*
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* If you wish to use this software or functionality therein that may be
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* covered by patents for commercial use, please contact:
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* Director of Intellectual Property Licensing
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* Office of Strategy and Technology
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* Hewlett-Packard Company
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* 1501 Page Mill Road
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* Palo Alto, California 94304
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer. Redistributions
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* in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution. Neither the name of
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* the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission. No right of
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* sublicense is granted herewith. Derivatives of the software and
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* output created using the software may be prepared, but only for
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* Non-Commercial Uses. Derivatives of the software may be shared with
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* others provided: (i) the others agree to abide by the list of
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* conditions herein which includes the Non-Commercial Use restrictions;
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* and (ii) such Derivatives of the software include the above copyright
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* notice to acknowledge the contribution from this software where
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* applicable, this list of conditions and the disclaimer below.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER 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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* Authors: Gabe Black
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*/
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#include "arch/x86/emulenv.hh"
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#include "base/misc.hh"
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using namespace X86ISA;
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void EmulEnv::doModRM(const ExtMachInst & machInst)
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{
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assert(machInst.modRM.mod != 3);
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//Use the SIB byte for addressing if the modrm byte calls for it.
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if (machInst.modRM.rm == 4 && machInst.addrSize != 2) {
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scale = 1 << machInst.sib.scale;
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index = machInst.sib.index | (machInst.rex.x << 3);
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base = machInst.sib.base | (machInst.rex.b << 3);
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//In this special case, we don't use a base. The displacement also
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//changes, but that's managed by the predecoder.
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if (machInst.sib.base == INTREG_RBP && machInst.modRM.mod == 0)
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base = NUM_INTREGS;
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//In -this- special case, we don't use an index.
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if (index == INTREG_RSP)
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index = NUM_INTREGS;
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} else {
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if (machInst.addrSize == 2) {
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warn("I'm not really using 16 bit MODRM like I'm supposed to!\n");
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} else {
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scale = 0;
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base = machInst.modRM.rm | (machInst.rex.b << 3);
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if (machInst.modRM.mod == 0 && machInst.modRM.rm == 5) {
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//Since we need to use a different encoding of this
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//instruction anyway, just ignore the base in those cases
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base = NUM_INTREGS;
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}
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}
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}
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//Figure out what segment to use. This won't be entirely accurate since
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//the presence of a displacement is supposed to make the instruction
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//default to the data segment.
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if (base != INTREG_RBP && base != INTREG_RSP ||
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0/*Has an immediate offset*/) {
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seg = SEGMENT_REG_DS;
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//Handle any segment override that might have been in the instruction
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int segFromInst = machInst.legacy.seg;
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if (segFromInst)
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seg = (SegmentRegIndex)(segFromInst - 1);
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} else {
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seg = SEGMENT_REG_SS;
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}
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}
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