3b_sim/ccpu.cpp

   1 #include "ccpu.hpp"
   2
   3 /*              CDat m_pc, m_pc_next;
   4                 CMem m_regfile, m_ram;
   5 */
   6
   7 //void registerExtension() {};
   8
   9 const char* expression = "(;.*)|(r0)|(rX)|(r1[0-5])|(r[1-5])|(r[6-9])|(0x[a-fA-F0-9]+)|([-]?\\d+)";
  10 const char* format = "(?1$&)"
  11                                         //Return-Register: violett
  12                                         "(?2\033[0m\033[35m$&\033[0m\\3:)"
  13                                         // Callee-saved Register: rot
  14                                         "(?4\033[0m\033[31m$&\033[0m\\3:)"
  15                                         //Argument-Register: gruen
  16                                         "(?5\033[0m\033[32m$&\033[0m\\3:)"
  17                                         // Temporary Register: gelb
  18                                         "(?6\033[0m\033[33m$&\033[0m\\3:)"
  19                                         // Zahlenwerte: tuerkis
  20                                         "(?7\033[0m\033[36m$&\033[0m\\3:)"
  21                                         "(?8\033[0m\033[36m$&\033[0m\\3:)";
  22
  23
  24 string CCpu::colorifyInstr(string instr)
  25 {
  26         boost::regex e;
  27         e.assign(expression);
  28         return boost::regex_replace(instr, e, format, boost::match_default | boost::format_all);
  29 }
  30
  31 void CCpu::registerExtension(Iext* ext)
  32 {
  33         m_exts.push_back(ext);
  34 }
  35
  36 void CCpu::applyToExtensions(const vector<string>& in)
  37 {
  38         for(auto iter = m_exts.begin(); iter != m_exts.end(); ++iter) {
  39                 (*iter)->parseInput(in);
  40         }
  41 }
  42
  43 void CCpu::tick()
  44 {
  45         // signal extensions
  46         // Todo
  47
  48         m_pc = m_pc_next;
  49         m_pc_next += 4;
  50         Iinstr* instr = this->getProg(m_pc);
  51
  52         if(instr == NULL) {
  53                 throw string("Out of Instructions!");
  54         }
  55
  56         for(auto iter = m_exts.begin(); iter != m_exts.end(); ++iter) {
  57                 (*iter)->applyTick();
  58         }
  59
  60         if(this->conditionMet(instr->getCondition())) {
  61                 cout << color(green,black) << "Executing: " << color(white,black) << colorifyInstr(instr->toString()) << endl;
  62                 instr->execInstr();
  63                 this->incPerfBy(instr->getClockCount());
  64         }
  65         else {
  66                 cout << color(red,black) << "Didn't Execute " << color(white,black) << colorifyInstr(instr->toString()) << "; condition wasn't met" << endl;
  67                 this->incPerf();
  68         }
  69
  70 }
  71
  72 bool CCpu::conditionMet(short cond)
  73 {
  74         switch(cond) {
  75                 case NOT_EQUAL:
  76                         return !this->m_Z;
  77                         break;
  78                 case EQUAL:
  79                         return this->m_Z;
  80                         break;
  81                 case NOT_OVERFLOW:
  82                         return !this->m_O;
  83                         break;
  84                 case OVER_FLOW:
  85                         return this->m_O;
  86                         break;
  87                 case NOT_CARRY:
  88                         return !this->m_C;
  89                         break;
  90                 case CARRY:
  91                         return this->m_C;
  92                         break;
  93                 case NOT_SIGNED:
  94                         return !this->m_S;
  95                         break;
  96                 case SIGNED:
  97                         return this->m_S;
  98                         break;
  99                 case ABOVE:
 100                         return (!this->m_C && !this->m_Z);
 101                         break;
 102                 case BELOW_EQ:
 103                         return (this->m_C || this->m_Z);
 104                         break;
 105                 case GREATER_EQ:
 106                         return (this->m_S == this->m_O);
 107                         break;
 108                 case LESS:
 109                         return (this->m_S != this->m_O);
 110                         break;
 111                 case GREATER:
 112                         return (!this->m_Z && (this->m_S == this->m_O));
 113                         break;
 114                 case LESS_EQ:
 115                         return (!this->m_Z || (this->m_S != this->m_O));
 116                         break;
 117                 case ALWAYS:
 118                         return true;
 119                         break;
 120                 case NEVER:
 121                         return false;
 122                         break;
 123                 default:
 124                         cerr << "What did you do? more than 16 values in 5 bits?!" << endl;
 125                         return false;
 126         }
 127
 128 }
 129
 130 CDat CCpu::getNextPC() const
 131 {
 132         return m_pc_next;
 133 }
 134
 135 CDat CCpu::getCurPC() const
 136 {
 137         return m_pc;
 138 }
 139
 140 void CCpu::setNextPC(CDat val)
 141 {
 142         m_pc_next = val;
 143 }
 144
 145 CDat CCpu::getFlags() const {
 146         CDat psw = 0;
 147         psw += (this->m_Z ? 1 : 0);
 148         psw += (this->m_O ? 2 : 0);
 149         psw += (this->m_C ? 4 : 0);
 150         psw += (this->m_S ? 8 : 0);
 151         return psw;
 152 }
 153
 154 void CCpu::setFlags(CDat psw) {
 155         this->m_Z = ((psw & 0x1) != 0);
 156         this->m_O = ((psw & 0x2) != 0);
 157         this->m_C = ((psw & 0x4) != 0);
 158         this->m_S = ((psw & 0x8) != 0);
 159 }
 160
 161 void CCpu::updateFlags(CDat val) {
 162         this->m_Z = (val == 0);
 163         this->m_S = ((val >> (BIT_LEN-1)) & 0x1);
 164 /*      this->m_C = false;
 165         this->m_O = false; */
 166 }
 167
 168 void CCpu::updateFlags(CDatd val, CDat a, CDat b) {
 169         this->m_Z = (val == 0);
 170         this->m_S = ((val >> (BIT_LEN-1)) & 0x1);
 171         this->m_C = ((val >> (BIT_LEN)) & 0x1);
 172         bool a_31 = ((a >> (BIT_LEN-1)) & 0x1);
 173         bool b_31 = ((b >> (BIT_LEN-1)) & 0x1);
 174         bool val_31 = ((val >> (BIT_LEN-1)) & 0x1);
 175         this->m_O = ((a_31 && b_31 && !val_31) || (!a_31 && !b_31 && val_31));
 176 }
 177
 178 void CCpu::updateCarry(bool c)
 179 {
 180         this->m_C = c;
 181 }
 182
 183 bool CCpu::getCarry()
 184 {
 185         return this->m_C;
 186 }
 187
 188 void CCpu::updateFlags(bool z, bool o, bool c, bool s)
 189 {
 190         this->m_Z = z;
 191         this->m_O = o;
 192         this->m_C = c;
 193         this->m_S = s;
 194 }
 195
 196 CDat CCpu::getRegister(const int addr) const
 197 {
 198         return m_reg.getDirect(addr);
 199 }
 200
 201 void CCpu::setRegister(const int addr, CDat data)
 202 {
 203         m_reg.setDirect(addr, data);
 204 }
 205
 206 CDat CCpu::getRAM(const int addr) const
 207 {
 208         if((addr & EXT_MODEL_OFFSET) == 0) {
 209                 return m_ram.get(addr);
 210         }
 211         else {
 212                 CDat result = 0;
 213                 for(auto iter = m_exts.begin(); iter != m_exts.end(); ++iter) {
 214                         result = (*iter)->readData(addr);
 215                         if(result != 0) {
 216                                 break;
 217                         }
 218                 }
 219                 return result;
 220         }
 221 }
 222
 223 void CCpu::setRAM(const int addr, CDat data)
 224 {
 225         if((addr & EXT_MODEL_OFFSET) == 0) {
 226                 m_ram.set(addr, data);
 227         }
 228         else {
 229                 for(auto iter = m_exts.begin(); iter != m_exts.end(); ++iter) {
 230                         (*iter)->loadData(addr, data);
 231                 }
 232         }
 233 }
 234
 235 void CCpu::setProg(int addr, Iinstr* instr)
 236 {
 237         m_prog.set(addr, instr);
 238 }
 239
 240 Iinstr* CCpu::getProg(const int addr) const
 241 {
 242         return m_prog.get(addr);
 243 }
 244
 245 int CCpu::getStack() const
 246 {
 247         return this->m_stack;
 248 }
 249
 250 void CCpu::setStack(const int val)
 251 {
 252         this->m_stack = val;
 253 }
 254
 255 CDat CCpu::getPerf() const
 256 {
 257         return this->m_perf;
 258 }
 259
 260 void CCpu::setPerf(CDat val)
 261 {
 262         this->m_perf = val;
 263 }
 264
 265 void CCpu::incPerf()
 266 {
 267         this->m_perf++;
 268 }
 269
 270 void CCpu::incPerfBy(short inc)
 271 {
 272         this->m_perf += inc;
 273 }
 274
 275
 276 CCpu::CCpu(int regs, int ram, int prog) : m_Z(false), m_S(false), m_C(false), m_O(false), m_pc(0), m_pc_next(0), m_perf(0), m_reg(regs), m_ram(ram), m_prog(prog), m_exts(0), m_stack(0)
 277 {
 278 }
 279
 280