utility.cc revision 7707:e5b6f1157be3
1/* 2 * Copyright (c) 2007 MIPS Technologies, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Korey Sewell 29 */ 30 31#include <cmath> 32 33#include "arch/mips/isa_traits.hh" 34#include "arch/mips/utility.hh" 35#include "config/full_system.hh" 36#include "cpu/thread_context.hh" 37#include "cpu/static_inst.hh" 38#include "sim/serialize.hh" 39#include "base/bitfield.hh" 40#include "base/misc.hh" 41 42#if FULL_SYSTEM 43#include "arch/mips/registers.hh" 44#include "arch/mips/vtophys.hh" 45#include "mem/vport.hh" 46#endif 47 48 49using namespace MipsISA; 50using namespace std; 51 52namespace MipsISA { 53 54uint64_t 55getArgument(ThreadContext *tc, int &number, uint16_t size, bool fp) 56{ 57#if FULL_SYSTEM 58 if (number < 4) { 59 if (fp) 60 return tc->readFloatRegBits(FirstArgumentReg + number); 61 else 62 return tc->readIntReg(FirstArgumentReg + number); 63 } else { 64 Addr sp = tc->readIntReg(StackPointerReg); 65 VirtualPort *vp = tc->getVirtPort(); 66 uint64_t arg = vp->read<uint64_t>(sp + 67 (number - 4) * sizeof(uint64_t)); 68 return arg; 69 } 70#else 71 panic("getArgument() is Full system only\n"); 72 M5_DUMMY_RETURN 73#endif 74} 75 76uint64_t 77fpConvert(ConvertType cvt_type, double fp_val) 78{ 79 80 switch (cvt_type) 81 { 82 case SINGLE_TO_DOUBLE: 83 { 84 double sdouble_val = fp_val; 85 void *sdouble_ptr = &sdouble_val; 86 uint64_t sdp_bits = *(uint64_t *) sdouble_ptr; 87 return sdp_bits; 88 } 89 90 case SINGLE_TO_WORD: 91 { 92 int32_t sword_val = (int32_t) fp_val; 93 void *sword_ptr = &sword_val; 94 uint64_t sword_bits= *(uint32_t *) sword_ptr; 95 return sword_bits; 96 } 97 98 case WORD_TO_SINGLE: 99 { 100 float wfloat_val = fp_val; 101 void *wfloat_ptr = &wfloat_val; 102 uint64_t wfloat_bits = *(uint32_t *) wfloat_ptr; 103 return wfloat_bits; 104 } 105 106 case WORD_TO_DOUBLE: 107 { 108 double wdouble_val = fp_val; 109 void *wdouble_ptr = &wdouble_val; 110 uint64_t wdp_bits = *(uint64_t *) wdouble_ptr; 111 return wdp_bits; 112 } 113 114 default: 115 panic("Invalid Floating Point Conversion Type (%d). See \"types.hh\" for List of Conversions\n",cvt_type); 116 return 0; 117 } 118} 119 120double 121roundFP(double val, int digits) 122{ 123 double digit_offset = pow(10.0,digits); 124 val = val * digit_offset; 125 val = val + 0.5; 126 val = floor(val); 127 val = val / digit_offset; 128 return val; 129} 130 131double 132truncFP(double val) 133{ 134 int trunc_val = (int) val; 135 return (double) trunc_val; 136} 137 138bool 139getCondCode(uint32_t fcsr, int cc_idx) 140{ 141 int shift = (cc_idx == 0) ? 23 : cc_idx + 24; 142 bool cc_val = (fcsr >> shift) & 0x00000001; 143 return cc_val; 144} 145 146uint32_t 147genCCVector(uint32_t fcsr, int cc_num, uint32_t cc_val) 148{ 149 int cc_idx = (cc_num == 0) ? 23 : cc_num + 24; 150 151 fcsr = bits(fcsr, 31, cc_idx + 1) << (cc_idx + 1) | 152 cc_val << cc_idx | 153 bits(fcsr, cc_idx - 1, 0); 154 155 return fcsr; 156} 157 158uint32_t 159genInvalidVector(uint32_t fcsr_bits) 160{ 161 //Set FCSR invalid in "flag" field 162 int invalid_offset = Invalid + Flag_Field; 163 fcsr_bits = fcsr_bits | (1 << invalid_offset); 164 165 //Set FCSR invalid in "cause" flag 166 int cause_offset = Invalid + Cause_Field; 167 fcsr_bits = fcsr_bits | (1 << cause_offset); 168 169 return fcsr_bits; 170} 171 172bool 173isNan(void *val_ptr, int size) 174{ 175 switch (size) 176 { 177 case 32: 178 { 179 uint32_t val_bits = *(uint32_t *) val_ptr; 180 return (bits(val_bits, 30, 23) == 0xFF); 181 } 182 183 case 64: 184 { 185 uint64_t val_bits = *(uint64_t *) val_ptr; 186 return (bits(val_bits, 62, 52) == 0x7FF); 187 } 188 189 default: 190 panic("Type unsupported. Size mismatch\n"); 191 } 192} 193 194 195bool 196isQnan(void *val_ptr, int size) 197{ 198 switch (size) 199 { 200 case 32: 201 { 202 uint32_t val_bits = *(uint32_t *) val_ptr; 203 return (bits(val_bits, 30, 22) == 0x1FE); 204 } 205 206 case 64: 207 { 208 uint64_t val_bits = *(uint64_t *) val_ptr; 209 return (bits(val_bits, 62, 51) == 0xFFE); 210 } 211 212 default: 213 panic("Type unsupported. Size mismatch\n"); 214 } 215} 216 217bool 218isSnan(void *val_ptr, int size) 219{ 220 switch (size) 221 { 222 case 32: 223 { 224 uint32_t val_bits = *(uint32_t *) val_ptr; 225 return (bits(val_bits, 30, 22) == 0x1FF); 226 } 227 228 case 64: 229 { 230 uint64_t val_bits = *(uint64_t *) val_ptr; 231 return (bits(val_bits, 62, 51) == 0xFFF); 232 } 233 234 default: 235 panic("Type unsupported. Size mismatch\n"); 236 } 237} 238 239template <class CPU> 240void 241zeroRegisters(CPU *cpu) 242{ 243 // Insure ISA semantics 244 // (no longer very clean due to the change in setIntReg() in the 245 // cpu model. Consider changing later.) 246 cpu->thread->setIntReg(ZeroReg, 0); 247 cpu->thread->setFloatReg(ZeroReg, 0.0); 248} 249 250void 251startupCPU(ThreadContext *tc, int cpuId) 252{ 253 tc->activate(0/*tc->threadId()*/); 254} 255 256void 257copyRegs(ThreadContext *src, ThreadContext *dest) 258{ 259 panic("Copy Regs Not Implemented Yet\n"); 260} 261 262void 263copyMiscRegs(ThreadContext *src, ThreadContext *dest) 264{ 265 panic("Copy Misc. Regs Not Implemented Yet\n"); 266} 267void 268skipFunction(ThreadContext *tc) 269{ 270 Addr newpc = tc->readIntReg(ReturnAddressReg); 271 tc->setPC(newpc); 272 tc->setNextPC(tc->readPC() + sizeof(TheISA::MachInst)); 273 tc->setNextPC(tc->readNextPC() + sizeof(TheISA::MachInst)); 274} 275 276 277} // namespace MipsISA 278