emulenv.cc revision 4604:3ffdd00e6c02
14486Sbinkertn@umich.edu/* 27897Shestness@cs.utexas.edu * Copyright (c) 2007 The Hewlett-Packard Development Company 34486Sbinkertn@umich.edu * All rights reserved. 44486Sbinkertn@umich.edu * 54486Sbinkertn@umich.edu * Redistribution and use of this software in source and binary forms, 64486Sbinkertn@umich.edu * with or without modification, are permitted provided that the 74486Sbinkertn@umich.edu * following conditions are met: 84486Sbinkertn@umich.edu * 94486Sbinkertn@umich.edu * The software must be used only for Non-Commercial Use which means any 104486Sbinkertn@umich.edu * use which is NOT directed to receiving any direct monetary 114486Sbinkertn@umich.edu * compensation for, or commercial advantage from such use. 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IN NO EVENT SHALL THE COPYRIGHT 475820Snate@binkert.org * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 482902SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 497897Shestness@cs.utexas.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 507914SBrad.Beckmann@amd.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 517914SBrad.Beckmann@amd.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 527914SBrad.Beckmann@amd.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 537914SBrad.Beckmann@amd.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 547914SBrad.Beckmann@amd.com * 557914SBrad.Beckmann@amd.com * Authors: Gabe Black 567914SBrad.Beckmann@amd.com */ 577914SBrad.Beckmann@amd.com 587914SBrad.Beckmann@amd.com#include "arch/x86/emulenv.hh" 597914SBrad.Beckmann@amd.com#include "base/misc.hh" 607914SBrad.Beckmann@amd.com 617914SBrad.Beckmann@amd.comusing namespace X86ISA; 627914SBrad.Beckmann@amd.com 637914SBrad.Beckmann@amd.comvoid EmulEnv::doModRM(const ExtMachInst & machInst) 646654Snate@binkert.org{ 654597Sbinkertn@umich.edu assert(machInst.modRM.mod != 3); 662424SN/A //Use the SIB byte for addressing if the modrm byte calls for it. 672424SN/A if (machInst.modRM.rm == 4 && machInst.addrSize != 2) { 682424SN/A scale = 1 << machInst.sib.scale; 692570SN/A index = machInst.sib.index; 703812SN/A base = machInst.sib.base; 712424SN/A //In this special case, we don't use a base. The displacement also 723125SN/A //changes, but that's managed by the predecoder. 737580SAli.Saidi@arm.com if (machInst.sib.base == INTREG_RBP && machInst.modRM.mod == 0) 747580SAli.Saidi@arm.com base = NUM_INTREGS; 75 //In -this- special case, we don't use an index. 76 if (machInst.sib.index == INTREG_RSP) 77 index = NUM_INTREGS; 78 } else { 79 if (machInst.addrSize == 2) { 80 warn("I'm not really using 16 bit MODRM like I'm supposed to!\n"); 81 } else { 82 scale = 0; 83 base = machInst.modRM.rm; 84 if (machInst.modRM.mod == 0 && machInst.modRM.rm == 5) { 85 base = NUM_INTREGS; 86 if (machInst.mode.submode == SixtyFourBitMode) 87 base = NUM_INTREGS+7; 88 } 89 } 90 } 91} 92 93