static_inst.hh revision 10037:5cac77888310
1/* 2 * Copyright (c) 2010-2013 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#ifndef __ARCH_ARM_INSTS_STATICINST_HH__ 43#define __ARCH_ARM_INSTS_STATICINST_HH__ 44 45#include "arch/arm/faults.hh" 46#include "arch/arm/utility.hh" 47#include "arch/arm/system.hh" 48#include "base/trace.hh" 49#include "cpu/static_inst.hh" 50#include "sim/byteswap.hh" 51#include "sim/full_system.hh" 52 53namespace ArmISA 54{ 55 56class ArmStaticInst : public StaticInst 57{ 58 protected: 59 bool aarch64; 60 uint8_t intWidth; 61 62 int32_t shift_rm_imm(uint32_t base, uint32_t shamt, 63 uint32_t type, uint32_t cfval) const; 64 int32_t shift_rm_rs(uint32_t base, uint32_t shamt, 65 uint32_t type, uint32_t cfval) const; 66 67 bool shift_carry_imm(uint32_t base, uint32_t shamt, 68 uint32_t type, uint32_t cfval) const; 69 bool shift_carry_rs(uint32_t base, uint32_t shamt, 70 uint32_t type, uint32_t cfval) const; 71 72 int64_t shiftReg64(uint64_t base, uint64_t shiftAmt, 73 ArmShiftType type, uint8_t width) const; 74 int64_t extendReg64(uint64_t base, ArmExtendType type, 75 uint64_t shiftAmt, uint8_t width) const; 76 77 template<int width> 78 static inline bool 79 saturateOp(int32_t &res, int64_t op1, int64_t op2, bool sub=false) 80 { 81 int64_t midRes = sub ? (op1 - op2) : (op1 + op2); 82 if (bits(midRes, width) != bits(midRes, width - 1)) { 83 if (midRes > 0) 84 res = (LL(1) << (width - 1)) - 1; 85 else 86 res = -(LL(1) << (width - 1)); 87 return true; 88 } else { 89 res = midRes; 90 return false; 91 } 92 } 93 94 static inline bool 95 satInt(int32_t &res, int64_t op, int width) 96 { 97 width--; 98 if (op >= (LL(1) << width)) { 99 res = (LL(1) << width) - 1; 100 return true; 101 } else if (op < -(LL(1) << width)) { 102 res = -(LL(1) << width); 103 return true; 104 } else { 105 res = op; 106 return false; 107 } 108 } 109 110 template<int width> 111 static inline bool 112 uSaturateOp(uint32_t &res, int64_t op1, int64_t op2, bool sub=false) 113 { 114 int64_t midRes = sub ? (op1 - op2) : (op1 + op2); 115 if (midRes >= (LL(1) << width)) { 116 res = (LL(1) << width) - 1; 117 return true; 118 } else if (midRes < 0) { 119 res = 0; 120 return true; 121 } else { 122 res = midRes; 123 return false; 124 } 125 } 126 127 static inline bool 128 uSatInt(int32_t &res, int64_t op, int width) 129 { 130 if (op >= (LL(1) << width)) { 131 res = (LL(1) << width) - 1; 132 return true; 133 } else if (op < 0) { 134 res = 0; 135 return true; 136 } else { 137 res = op; 138 return false; 139 } 140 } 141 142 // Constructor 143 ArmStaticInst(const char *mnem, ExtMachInst _machInst, 144 OpClass __opClass) 145 : StaticInst(mnem, _machInst, __opClass) 146 { 147 aarch64 = machInst.aarch64; 148 if (bits(machInst, 28, 24) == 0x10) 149 intWidth = 64; // Force 64-bit width for ADR/ADRP 150 else 151 intWidth = (aarch64 && bits(machInst, 31)) ? 64 : 32; 152 } 153 154 /// Print a register name for disassembly given the unique 155 /// dependence tag number (FP or int). 156 void printReg(std::ostream &os, int reg) const; 157 void printMnemonic(std::ostream &os, 158 const std::string &suffix = "", 159 bool withPred = true, 160 bool withCond64 = false, 161 ConditionCode cond64 = COND_UC) const; 162 void printTarget(std::ostream &os, Addr target, 163 const SymbolTable *symtab) const; 164 void printCondition(std::ostream &os, unsigned code, 165 bool noImplicit=false) const; 166 void printMemSymbol(std::ostream &os, const SymbolTable *symtab, 167 const std::string &prefix, const Addr addr, 168 const std::string &suffix) const; 169 void printShiftOperand(std::ostream &os, IntRegIndex rm, 170 bool immShift, uint32_t shiftAmt, 171 IntRegIndex rs, ArmShiftType type) const; 172 void printExtendOperand(bool firstOperand, std::ostream &os, 173 IntRegIndex rm, ArmExtendType type, 174 int64_t shiftAmt) const; 175 176 177 void printDataInst(std::ostream &os, bool withImm) const; 178 void printDataInst(std::ostream &os, bool withImm, bool immShift, bool s, 179 IntRegIndex rd, IntRegIndex rn, IntRegIndex rm, 180 IntRegIndex rs, uint32_t shiftAmt, ArmShiftType type, 181 uint32_t imm) const; 182 183 void 184 advancePC(PCState &pcState) const 185 { 186 pcState.advance(); 187 } 188 189 std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const; 190 191 static inline uint32_t 192 cpsrWriteByInstr(CPSR cpsr, uint32_t val, SCR scr, NSACR nsacr, 193 uint8_t byteMask, bool affectState, bool nmfi, ThreadContext *tc) 194 { 195 bool privileged = (cpsr.mode != MODE_USER); 196 bool haveVirt = ArmSystem::haveVirtualization(tc); 197 bool haveSecurity = ArmSystem::haveSecurity(tc); 198 bool isSecure = inSecureState(scr, cpsr) || !haveSecurity; 199 200 uint32_t bitMask = 0; 201 202 if (bits(byteMask, 3)) { 203 unsigned lowIdx = affectState ? 24 : 27; 204 bitMask = bitMask | mask(31, lowIdx); 205 } 206 if (bits(byteMask, 2)) { 207 bitMask = bitMask | mask(19, 16); 208 } 209 if (bits(byteMask, 1)) { 210 unsigned highIdx = affectState ? 15 : 9; 211 unsigned lowIdx = (privileged && (isSecure || scr.aw || haveVirt)) 212 ? 8 : 9; 213 bitMask = bitMask | mask(highIdx, lowIdx); 214 } 215 if (bits(byteMask, 0)) { 216 if (privileged) { 217 bitMask |= 1 << 7; 218 if ( (!nmfi || !((val >> 6) & 0x1)) && 219 (isSecure || scr.fw || haveVirt) ) { 220 bitMask |= 1 << 6; 221 } 222 // Now check the new mode is allowed 223 OperatingMode newMode = (OperatingMode) (val & mask(5)); 224 OperatingMode oldMode = (OperatingMode)(uint32_t)cpsr.mode; 225 if (!badMode(newMode)) { 226 bool validModeChange = true; 227 // Check for attempts to enter modes only permitted in 228 // Secure state from Non-secure state. These are Monitor 229 // mode ('10110'), and FIQ mode ('10001') if the Security 230 // Extensions have reserved it. 231 if (!isSecure && newMode == MODE_MON) 232 validModeChange = false; 233 if (!isSecure && newMode == MODE_FIQ && nsacr.rfr == '1') 234 validModeChange = false; 235 // There is no Hyp mode ('11010') in Secure state, so that 236 // is UNPREDICTABLE 237 if (scr.ns == '0' && newMode == MODE_HYP) 238 validModeChange = false; 239 // Cannot move into Hyp mode directly from a Non-secure 240 // PL1 mode 241 if (!isSecure && oldMode != MODE_HYP && newMode == MODE_HYP) 242 validModeChange = false; 243 // Cannot move out of Hyp mode with this function except 244 // on an exception return 245 if (oldMode == MODE_HYP && newMode != MODE_HYP && !affectState) 246 validModeChange = false; 247 // Must not change to 64 bit when running in 32 bit mode 248 if (!opModeIs64(oldMode) && opModeIs64(newMode)) 249 validModeChange = false; 250 251 // If we passed all of the above then set the bit mask to 252 // copy the mode accross 253 if (validModeChange) { 254 bitMask = bitMask | mask(5); 255 } else { 256 warn_once("Illegal change to CPSR mode attempted\n"); 257 } 258 } else { 259 warn_once("Ignoring write of bad mode to CPSR.\n"); 260 } 261 } 262 if (affectState) 263 bitMask = bitMask | (1 << 5); 264 } 265 266 return ((uint32_t)cpsr & ~bitMask) | (val & bitMask); 267 } 268 269 static inline uint32_t 270 spsrWriteByInstr(uint32_t spsr, uint32_t val, 271 uint8_t byteMask, bool affectState) 272 { 273 uint32_t bitMask = 0; 274 275 if (bits(byteMask, 3)) 276 bitMask = bitMask | mask(31, 24); 277 if (bits(byteMask, 2)) 278 bitMask = bitMask | mask(19, 16); 279 if (bits(byteMask, 1)) 280 bitMask = bitMask | mask(15, 8); 281 if (bits(byteMask, 0)) 282 bitMask = bitMask | mask(7, 0); 283 284 return ((spsr & ~bitMask) | (val & bitMask)); 285 } 286 287 template<class XC> 288 static inline Addr 289 readPC(XC *xc) 290 { 291 return xc->pcState().instPC(); 292 } 293 294 template<class XC> 295 static inline void 296 setNextPC(XC *xc, Addr val) 297 { 298 PCState pc = xc->pcState(); 299 pc.instNPC(val); 300 xc->pcState(pc); 301 } 302 303 template<class T> 304 static inline T 305 cSwap(T val, bool big) 306 { 307 if (big) { 308 return gtobe(val); 309 } else { 310 return gtole(val); 311 } 312 } 313 314 template<class T, class E> 315 static inline T 316 cSwap(T val, bool big) 317 { 318 const unsigned count = sizeof(T) / sizeof(E); 319 union { 320 T tVal; 321 E eVals[count]; 322 } conv; 323 conv.tVal = htog(val); 324 if (big) { 325 for (unsigned i = 0; i < count; i++) { 326 conv.eVals[i] = gtobe(conv.eVals[i]); 327 } 328 } else { 329 for (unsigned i = 0; i < count; i++) { 330 conv.eVals[i] = gtole(conv.eVals[i]); 331 } 332 } 333 return gtoh(conv.tVal); 334 } 335 336 // Perform an interworking branch. 337 template<class XC> 338 static inline void 339 setIWNextPC(XC *xc, Addr val) 340 { 341 PCState pc = xc->pcState(); 342 pc.instIWNPC(val); 343 xc->pcState(pc); 344 } 345 346 // Perform an interworking branch in ARM mode, a regular branch 347 // otherwise. 348 template<class XC> 349 static inline void 350 setAIWNextPC(XC *xc, Addr val) 351 { 352 PCState pc = xc->pcState(); 353 pc.instAIWNPC(val); 354 xc->pcState(pc); 355 } 356 357 inline Fault 358 disabledFault() const 359 { 360 return new UndefinedInstruction(machInst, false, mnemonic, true); 361 } 362 363 public: 364 virtual void 365 annotateFault(ArmFault *fault) {} 366}; 367} 368 369#endif //__ARCH_ARM_INSTS_STATICINST_HH__ 370