emulenv.cc revision 9023
14604Sgblack@eecs.umich.edu/* 24604Sgblack@eecs.umich.edu * Copyright (c) 2007 The Hewlett-Packard Development Company 34604Sgblack@eecs.umich.edu * All rights reserved. 44604Sgblack@eecs.umich.edu * 57087Snate@binkert.org * The license below extends only to copyright in the software and shall 67087Snate@binkert.org * not be construed as granting a license to any other intellectual 77087Snate@binkert.org * property including but not limited to intellectual property relating 87087Snate@binkert.org * to a hardware implementation of the functionality of the software 97087Snate@binkert.org * licensed hereunder. You may use the software subject to the license 107087Snate@binkert.org * terms below provided that you ensure that this notice is replicated 117087Snate@binkert.org * unmodified and in its entirety in all distributions of the software, 127087Snate@binkert.org * modified or unmodified, in source code or in binary form. 134604Sgblack@eecs.umich.edu * 147087Snate@binkert.org * Redistribution and use in source and binary forms, with or without 157087Snate@binkert.org * modification, are permitted provided that the following conditions are 167087Snate@binkert.org * met: redistributions of source code must retain the above copyright 177087Snate@binkert.org * notice, this list of conditions and the following disclaimer; 187087Snate@binkert.org * redistributions in binary form must reproduce the above copyright 197087Snate@binkert.org * notice, this list of conditions and the following disclaimer in the 207087Snate@binkert.org * documentation and/or other materials provided with the distribution; 217087Snate@binkert.org * neither the name of the copyright holders nor the names of its 224604Sgblack@eecs.umich.edu * contributors may be used to endorse or promote products derived from 237087Snate@binkert.org * this software without specific prior written permission. 244604Sgblack@eecs.umich.edu * 254604Sgblack@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 264604Sgblack@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 274604Sgblack@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 284604Sgblack@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 294604Sgblack@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 304604Sgblack@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 314604Sgblack@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 324604Sgblack@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 334604Sgblack@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 344604Sgblack@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 354604Sgblack@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 364604Sgblack@eecs.umich.edu * 374604Sgblack@eecs.umich.edu * Authors: Gabe Black 384604Sgblack@eecs.umich.edu */ 394604Sgblack@eecs.umich.edu 405616Snate@binkert.org#include <cassert> 415616Snate@binkert.org 424604Sgblack@eecs.umich.edu#include "arch/x86/emulenv.hh" 434604Sgblack@eecs.umich.edu#include "base/misc.hh" 444604Sgblack@eecs.umich.edu 454604Sgblack@eecs.umich.eduusing namespace X86ISA; 464604Sgblack@eecs.umich.edu 474604Sgblack@eecs.umich.eduvoid EmulEnv::doModRM(const ExtMachInst & machInst) 484604Sgblack@eecs.umich.edu{ 494604Sgblack@eecs.umich.edu assert(machInst.modRM.mod != 3); 504604Sgblack@eecs.umich.edu //Use the SIB byte for addressing if the modrm byte calls for it. 514604Sgblack@eecs.umich.edu if (machInst.modRM.rm == 4 && machInst.addrSize != 2) { 524604Sgblack@eecs.umich.edu scale = 1 << machInst.sib.scale; 534712Sgblack@eecs.umich.edu index = machInst.sib.index | (machInst.rex.x << 3); 544712Sgblack@eecs.umich.edu base = machInst.sib.base | (machInst.rex.b << 3); 554604Sgblack@eecs.umich.edu //In this special case, we don't use a base. The displacement also 569023Sgblack@eecs.umich.edu //changes, but that's managed by the decoder. 574604Sgblack@eecs.umich.edu if (machInst.sib.base == INTREG_RBP && machInst.modRM.mod == 0) 584604Sgblack@eecs.umich.edu base = NUM_INTREGS; 594604Sgblack@eecs.umich.edu //In -this- special case, we don't use an index. 604848Sgblack@eecs.umich.edu if (index == INTREG_RSP) 614604Sgblack@eecs.umich.edu index = NUM_INTREGS; 624604Sgblack@eecs.umich.edu } else { 634604Sgblack@eecs.umich.edu if (machInst.addrSize == 2) { 646071Sgblack@eecs.umich.edu unsigned rm = machInst.modRM.rm; 656071Sgblack@eecs.umich.edu if (rm <= 3) { 666071Sgblack@eecs.umich.edu scale = 1; 676071Sgblack@eecs.umich.edu if (rm < 2) { 686071Sgblack@eecs.umich.edu base = INTREG_RBX; 696071Sgblack@eecs.umich.edu } else { 706071Sgblack@eecs.umich.edu base = INTREG_RBP; 716071Sgblack@eecs.umich.edu } 726071Sgblack@eecs.umich.edu index = (rm % 2) ? INTREG_RDI : INTREG_RSI; 736071Sgblack@eecs.umich.edu } else { 746071Sgblack@eecs.umich.edu scale = 0; 756071Sgblack@eecs.umich.edu switch (rm) { 766071Sgblack@eecs.umich.edu case 4: 776071Sgblack@eecs.umich.edu base = INTREG_RSI; 786071Sgblack@eecs.umich.edu break; 796071Sgblack@eecs.umich.edu case 5: 806071Sgblack@eecs.umich.edu base = INTREG_RDI; 816071Sgblack@eecs.umich.edu break; 826071Sgblack@eecs.umich.edu case 6: 836071Sgblack@eecs.umich.edu base = INTREG_RBP; 846071Sgblack@eecs.umich.edu break; 856071Sgblack@eecs.umich.edu case 7: 866071Sgblack@eecs.umich.edu base = INTREG_RBX; 876071Sgblack@eecs.umich.edu break; 886071Sgblack@eecs.umich.edu } 896071Sgblack@eecs.umich.edu } 904604Sgblack@eecs.umich.edu } else { 914604Sgblack@eecs.umich.edu scale = 0; 924712Sgblack@eecs.umich.edu base = machInst.modRM.rm | (machInst.rex.b << 3); 934604Sgblack@eecs.umich.edu if (machInst.modRM.mod == 0 && machInst.modRM.rm == 5) { 944712Sgblack@eecs.umich.edu //Since we need to use a different encoding of this 954712Sgblack@eecs.umich.edu //instruction anyway, just ignore the base in those cases 964848Sgblack@eecs.umich.edu base = NUM_INTREGS; 974604Sgblack@eecs.umich.edu } 984604Sgblack@eecs.umich.edu } 994604Sgblack@eecs.umich.edu } 1004863Sgblack@eecs.umich.edu //Figure out what segment to use. This won't be entirely accurate since 1014863Sgblack@eecs.umich.edu //the presence of a displacement is supposed to make the instruction 1024863Sgblack@eecs.umich.edu //default to the data segment. 1036437Sgblack@eecs.umich.edu if ((base != INTREG_RBP && base != INTREG_RSP) || machInst.dispSize) { 1044863Sgblack@eecs.umich.edu seg = SEGMENT_REG_DS; 1054863Sgblack@eecs.umich.edu //Handle any segment override that might have been in the instruction 1064863Sgblack@eecs.umich.edu int segFromInst = machInst.legacy.seg; 1074863Sgblack@eecs.umich.edu if (segFromInst) 1084863Sgblack@eecs.umich.edu seg = (SegmentRegIndex)(segFromInst - 1); 1094863Sgblack@eecs.umich.edu } else { 1104863Sgblack@eecs.umich.edu seg = SEGMENT_REG_SS; 1114863Sgblack@eecs.umich.edu } 1124604Sgblack@eecs.umich.edu} 1134604Sgblack@eecs.umich.edu 1145966Sgblack@eecs.umich.eduvoid EmulEnv::setSeg(const ExtMachInst & machInst) 1155966Sgblack@eecs.umich.edu{ 1165966Sgblack@eecs.umich.edu seg = SEGMENT_REG_DS; 1175966Sgblack@eecs.umich.edu //Handle any segment override that might have been in the instruction 1185966Sgblack@eecs.umich.edu int segFromInst = machInst.legacy.seg; 1195966Sgblack@eecs.umich.edu if (segFromInst) 1205966Sgblack@eecs.umich.edu seg = (SegmentRegIndex)(segFromInst - 1); 1215966Sgblack@eecs.umich.edu} 122