macromem.cc revision 7342
1/* 2 * Copyright (c) 2010 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2007-2008 The Florida State University 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Stephen Hines 41 */ 42 43#include "arch/arm/insts/macromem.hh" 44#include "arch/arm/decoder.hh" 45 46using namespace ArmISAInst; 47 48namespace ArmISA 49{ 50 51MacroMemOp::MacroMemOp(const char *mnem, ExtMachInst machInst, 52 OpClass __opClass, IntRegIndex rn, 53 bool index, bool up, bool user, bool writeback, 54 bool load, uint32_t reglist) : 55 PredMacroOp(mnem, machInst, __opClass) 56{ 57 uint32_t regs = reglist; 58 uint32_t ones = number_of_ones(reglist); 59 // Remember that writeback adds a uop 60 numMicroops = ones + (writeback ? 1 : 0) + 1; 61 microOps = new StaticInstPtr[numMicroops]; 62 uint32_t addr = 0; 63 64 if (!up) 65 addr = (ones << 2) - 4; 66 67 if (!index) 68 addr += 4; 69 70 StaticInstPtr *uop = microOps; 71 StaticInstPtr wbUop; 72 if (writeback) { 73 if (up) { 74 wbUop = new MicroAddiUop(machInst, rn, rn, ones * 4); 75 } else { 76 wbUop = new MicroSubiUop(machInst, rn, rn, ones * 4); 77 } 78 } 79 80 // Add 0 to Rn and stick it in ureg0. 81 // This is equivalent to a move. 82 *uop = new MicroAddiUop(machInst, INTREG_UREG0, rn, 0); 83 84 // Write back at the start for loads. This covers the ldm exception return 85 // case where the base needs to be written in the old mode. Stores may need 86 // the original value of the base, but they don't change mode and can 87 // write back at the end like before. 88 if (load && writeback) { 89 *++uop = wbUop; 90 } 91 92 unsigned reg = 0; 93 bool force_user = user & !bits(reglist, 15); 94 bool exception_ret = user & bits(reglist, 15); 95 96 for (int i = 0; i < ones; i++) { 97 // Find the next register. 98 while (!bits(regs, reg)) 99 reg++; 100 replaceBits(regs, reg, 0); 101 102 unsigned regIdx = reg; 103 if (force_user) { 104 regIdx = intRegInMode(MODE_USER, regIdx); 105 } 106 107 if (load) { 108 if (reg == INTREG_PC && exception_ret) { 109 // This must be the exception return form of ldm. 110 *++uop = new MicroLdrRetUop(machInst, regIdx, 111 INTREG_UREG0, up, addr); 112 } else { 113 *++uop = new MicroLdrUop(machInst, regIdx, 114 INTREG_UREG0, up, addr); 115 } 116 } else { 117 *++uop = new MicroStrUop(machInst, regIdx, INTREG_UREG0, up, addr); 118 } 119 120 if (up) 121 addr += 4; 122 else 123 addr -= 4; 124 } 125 126 if (!load && writeback) { 127 *++uop = wbUop; 128 } 129 130 (*uop)->setLastMicroop(); 131} 132 133MacroVFPMemOp::MacroVFPMemOp(const char *mnem, ExtMachInst machInst, 134 OpClass __opClass, IntRegIndex rn, 135 RegIndex vd, bool single, bool up, 136 bool writeback, bool load, uint32_t offset) : 137 PredMacroOp(mnem, machInst, __opClass) 138{ 139 int i = 0; 140 141 // The lowest order bit selects fldmx (set) or fldmd (clear). These seem 142 // to be functionally identical except that fldmx is deprecated. For now 143 // we'll assume they're otherwise interchangable. 144 int count = (single ? offset : (offset / 2)); 145 if (count == 0 || count > NumFloatArchRegs) 146 warn_once("Bad offset field for VFP load/store multiple.\n"); 147 if (count == 0) { 148 // Force there to be at least one microop so the macroop makes sense. 149 writeback = true; 150 } 151 if (count > NumFloatArchRegs) 152 count = NumFloatArchRegs; 153 154 numMicroops = count * (single ? 1 : 2) + (writeback ? 1 : 0); 155 microOps = new StaticInstPtr[numMicroops]; 156 157 uint32_t addr = 0; 158 159 if (!up) 160 addr = 4 * offset; 161 162 bool tempUp = up; 163 for (int j = 0; j < count; j++) { 164 if (load) { 165 microOps[i++] = new MicroLdrFpUop(machInst, vd++, rn, 166 tempUp, addr); 167 if (!single) 168 microOps[i++] = new MicroLdrFpUop(machInst, vd++, rn, 169 tempUp, addr + 4); 170 } else { 171 microOps[i++] = new MicroStrFpUop(machInst, vd++, rn, 172 tempUp, addr); 173 if (!single) 174 microOps[i++] = new MicroStrFpUop(machInst, vd++, rn, 175 tempUp, addr + 4); 176 } 177 if (!tempUp) { 178 addr -= (single ? 4 : 8); 179 // The microops don't handle negative displacement, so turn if we 180 // hit zero, flip polarity and start adding. 181 if (addr == 0) { 182 tempUp = true; 183 } 184 } else { 185 addr += (single ? 4 : 8); 186 } 187 } 188 189 if (writeback) { 190 if (up) { 191 microOps[i++] = 192 new MicroAddiUop(machInst, rn, rn, 4 * offset); 193 } else { 194 microOps[i++] = 195 new MicroSubiUop(machInst, rn, rn, 4 * offset); 196 } 197 } 198 199 assert(numMicroops == i); 200 microOps[numMicroops - 1]->setLastMicroop(); 201} 202 203} 204