riscv/sim.cc

   1 #include "sim.h"
   2 #include "applink.h"
   3 #include "common.h"
   4 #include <sys/mman.h>
   5 #include <map>
   6 #include <iostream>
   7 #include <climits>
   8
   9 sim_t::sim_t(int _nprocs, size_t _memsz, appserver_link_t* _applink)
  10   : applink(_applink),
  11     memsz(_memsz),
  12     mem((char*)mmap64(NULL, memsz, PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0)),
  13     procs(std::vector<processor_t>(_nprocs,processor_t(this,mem,memsz)))
  14 {
  15   demand(mem != MAP_FAILED, "couldn't allocate target machine's memory");
  16
  17   for(int i = 0; i < (int)procs.size(); i++)
  18     procs[i].init(i);
  19
  20   applink->init(this);
  21 }
  22
  23 sim_t::~sim_t()
  24 {
  25 }
  26
  27 void sim_t::set_tohost(reg_t val)
  28 {
  29   fromhost = 0;
  30   tohost = val;
  31   applink->wait_for_tohost();
  32 }
  33
  34 reg_t sim_t::get_fromhost()
  35 {
  36   applink->wait_for_fromhost();
  37   return fromhost;
  38 }
  39
  40 void sim_t::run(bool debug)
  41 {
  42   applink->wait_for_start();
  43
  44   while(1)
  45   {
  46     if(!debug)
  47       step_all(100,100,false);
  48     else
  49     {
  50       putchar(':');
  51       char s[128];
  52       std::cin.getline(s,sizeof(s)-1);
  53
  54       char* p = strtok(s," ");
  55       if(!p)
  56       {
  57         interactive_run_noisy(std::string("r"), std::vector<std::string>(1,"1"));
  58         continue;
  59       }
  60       std::string cmd = p;
  61
  62       std::vector<std::string> args;
  63       while((p = strtok(NULL," ")))
  64         args.push_back(p);
  65
  66
  67       typedef void (sim_t::*interactive_func)(const std::string&, const std::vector<std::string>&);
  68       std::map<std::string,interactive_func> funcs;
  69
  70       funcs["r"] = &sim_t::interactive_run_noisy;
  71       funcs["rs"] = &sim_t::interactive_run_silent;
  72       funcs["rp"] = &sim_t::interactive_run_proc_noisy;
  73       funcs["rps"] = &sim_t::interactive_run_proc_silent;
  74       funcs["reg"] = &sim_t::interactive_reg;
  75       funcs["fregs"] = &sim_t::interactive_fregs;
  76       funcs["fregd"] = &sim_t::interactive_fregd;
  77       funcs["mem"] = &sim_t::interactive_mem;
  78       funcs["until"] = &sim_t::interactive_until;
  79       funcs["while"] = &sim_t::interactive_until;
  80       funcs["q"] = &sim_t::interactive_quit;
  81
  82       try
  83       {
  84         if(funcs.count(cmd))
  85           (this->*funcs[cmd])(cmd, args);
  86       }
  87       catch(trap_t t) {}
  88     }
  89   }
  90 }
  91
  92 void sim_t::step_all(size_t n, size_t interleave, bool noisy)
  93 {
  94   for(size_t j = 0; j < n; j+=interleave)
  95     for(int i = 0; i < (int)procs.size(); i++)
  96       procs[i].step(interleave,noisy);
  97 }
  98
  99 void sim_t::interactive_run_noisy(const std::string& cmd, const std::vector<std::string>& args)
 100 {
 101   interactive_run(cmd,args,true);
 102 }
 103
 104 void sim_t::interactive_run_silent(const std::string& cmd, const std::vector<std::string>& args)
 105 {
 106   interactive_run(cmd,args,false);
 107 }
 108
 109 void sim_t::interactive_run(const std::string& cmd, const std::vector<std::string>& args, bool noisy)
 110 {
 111   if(args.size())
 112     step_all(atoll(args[0].c_str()),1,noisy);
 113   else
 114     while(1) step_all(1,1,noisy);
 115 }
 116
 117 void sim_t::interactive_run_proc_noisy(const std::string& cmd, const std::vector<std::string>& args)
 118 {
 119   interactive_run_proc(cmd,args,true);
 120 }
 121
 122 void sim_t::interactive_run_proc_silent(const std::string& cmd, const std::vector<std::string>& args)
 123 {
 124   interactive_run_proc(cmd,args,false);
 125 }
 126
 127 void sim_t::interactive_run_proc(const std::string& cmd, const std::vector<std::string>& a, bool noisy)
 128 {
 129   if(a.size() == 0)
 130     return;
 131
 132   int p = atoi(a[0].c_str());
 133   if(p >= (int)procs.size())
 134     return;
 135
 136   if(a.size() == 2)
 137     procs[p].step(atoi(a[1].c_str()),noisy);
 138   else
 139     while(1) procs[p].step(1,noisy);
 140 }
 141
 142 void sim_t::interactive_quit(const std::string& cmd, const std::vector<std::string>& args)
 143 {
 144   exit(0);
 145 }
 146
 147 reg_t sim_t::get_pc(const std::vector<std::string>& args)
 148 {
 149   if(args.size() != 1)
 150     throw trap_illegal_instruction;
 151
 152   int p = atoi(args[0].c_str());
 153   if(p >= (int)procs.size())
 154     throw trap_illegal_instruction;
 155
 156   return procs[p].pc;
 157 }
 158
 159 reg_t sim_t::get_reg(const std::vector<std::string>& args)
 160 {
 161   if(args.size() != 2)
 162     throw trap_illegal_instruction;
 163
 164   int p = atoi(args[0].c_str());
 165   int r = atoi(args[1].c_str());
 166   if(p >= (int)procs.size() || r >= NXPR)
 167     throw trap_illegal_instruction;
 168
 169   return procs[p].XPR[r];
 170 }
 171
 172 reg_t sim_t::get_freg(const std::vector<std::string>& args)
 173 {
 174   if(args.size() != 2)
 175     throw trap_illegal_instruction;
 176
 177   int p = atoi(args[0].c_str());
 178   int r = atoi(args[1].c_str());
 179   if(p >= (int)procs.size() || r >= NFPR)
 180     throw trap_illegal_instruction;
 181
 182   return procs[p].FPR[r];
 183 }
 184
 185 reg_t sim_t::get_tohost(const std::vector<std::string>& args)
 186 {
 187   if(args.size() != 1)
 188     throw trap_illegal_instruction;
 189
 190   int p = atoi(args[0].c_str());
 191   if(p >= (int)procs.size())
 192     throw trap_illegal_instruction;
 193
 194   return procs[p].tohost;
 195 }
 196
 197 void sim_t::interactive_reg(const std::string& cmd, const std::vector<std::string>& args)
 198 {
 199   printf("0x%016llx\n",(unsigned long long)get_reg(args));
 200 }
 201
 202 union fpr
 203 {
 204   reg_t r;
 205   float s;
 206   double d;
 207 };
 208
 209 void sim_t::interactive_fregs(const std::string& cmd, const std::vector<std::string>& args)
 210 {
 211   fpr f;
 212   f.r = get_freg(args);
 213   printf("%g\n",f.s);
 214 }
 215
 216 void sim_t::interactive_fregd(const std::string& cmd, const std::vector<std::string>& args)
 217 {
 218   fpr f;
 219   f.r = get_freg(args);
 220   printf("%g\n",f.d);
 221 }
 222
 223 reg_t sim_t::get_mem(const std::vector<std::string>& args)
 224 {
 225   if(args.size() != 1)
 226     throw trap_illegal_instruction;
 227
 228   reg_t addr = strtol(args[0].c_str(),NULL,16), val;
 229   if(addr == LONG_MAX)
 230     addr = strtoul(args[0].c_str(),NULL,16);
 231
 232   mmu_t mmu(mem,memsz);
 233   switch(addr % 8)
 234   {
 235     case 0:
 236       val = mmu.load_uint64(addr);
 237       break;
 238     case 4:
 239       val = mmu.load_uint32(addr);
 240       break;
 241     case 2:
 242     case 6:
 243       val = mmu.load_uint16(addr);
 244       break;
 245     default:
 246       val = mmu.load_uint8(addr);
 247       break;
 248   }
 249   return val;
 250 }
 251
 252 void sim_t::interactive_mem(const std::string& cmd, const std::vector<std::string>& args)
 253 {
 254   printf("0x%016llx\n",(unsigned long long)get_mem(args));
 255 }
 256
 257 void sim_t::interactive_until(const std::string& cmd, const std::vector<std::string>& args)
 258 {
 259   if(args.size() < 3)
 260     return;
 261
 262   std::string scmd = args[0];
 263   reg_t val = strtol(args[args.size()-1].c_str(),NULL,16);
 264   if(val == LONG_MAX)
 265     val = strtoul(args[args.size()-1].c_str(),NULL,16);
 266
 267   std::vector<std::string> args2;
 268   args2 = std::vector<std::string>(args.begin()+1,args.end()-1);
 269
 270   while(1)
 271   {
 272     reg_t current;
 273     if(scmd == "reg")
 274       current = get_reg(args2);
 275     else if(scmd == "pc")
 276       current = get_pc(args2);
 277     else if(scmd == "mem")
 278       current = get_mem(args2);
 279     else if(scmd == "tohost")
 280       current = get_tohost(args2);
 281     else
 282       return;
 283
 284     if(cmd == "until" && current == val)
 285       break;
 286     if(cmd == "while" && current != val)
 287       break;
 288
 289     step_all(1,1,false);
 290   }
 291 }