sim/moxie/interp.c

   1 /* Simulator for the moxie processor
   2    Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
   3    Contributed by Anthony Green
   4
   5 This file is part of GDB, the GNU debugger.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <signal.h>
  21 #include <stdlib.h>
  22 #include "sysdep.h"
  23 #include <sys/times.h>
  24 #include <sys/param.h>
  25 #include <netinet/in.h> /* for byte ordering macros */
  26 #include "bfd.h"
  27 #include "gdb/callback.h"
  28 #include "libiberty.h"
  29 #include "gdb/remote-sim.h"
  30
  31 #include "sim-main.h"
  32 #include "sim-base.h"
  33
  34 typedef int word;
  35 typedef unsigned int uword;
  36
  37 host_callback *       callback;
  38
  39 FILE *tracefile;
  40
  41 /* Extract the signed 10-bit offset from a 16-bit branch
  42    instruction.  */
  43 #define INST2OFFSET(o) ((((signed short)((o & ((1<<10)-1))<<6))>>6)<<1)
  44
  45 #define EXTRACT_WORD(addr) \
  46   ((sim_core_read_aligned_1 (scpu, cia, read_map, addr) << 24) \
  47    + (sim_core_read_aligned_1 (scpu, cia, read_map, addr+1) << 16) \
  48    + (sim_core_read_aligned_1 (scpu, cia, read_map, addr+2) << 8) \
  49    + (sim_core_read_aligned_1 (scpu, cia, read_map, addr+3)))
  50
  51 unsigned long
  52 moxie_extract_unsigned_integer (addr, len)
  53      unsigned char * addr;
  54      int len;
  55 {
  56   unsigned long retval;
  57   unsigned char * p;
  58   unsigned char * startaddr = (unsigned char *)addr;
  59   unsigned char * endaddr = startaddr + len;
  60
  61   if (len > (int) sizeof (unsigned long))
  62     printf ("That operation is not available on integers of more than %d bytes.",
  63             sizeof (unsigned long));
  64
  65   /* Start at the most significant end of the integer, and work towards
  66      the least significant.  */
  67   retval = 0;
  68
  69   for (p = endaddr; p > startaddr;)
  70     retval = (retval << 8) | * -- p;
  71
  72   return retval;
  73 }
  74
  75 void
  76 moxie_store_unsigned_integer (addr, len, val)
  77      unsigned char * addr;
  78      int len;
  79      unsigned long val;
  80 {
  81   unsigned char * p;
  82   unsigned char * startaddr = (unsigned char *)addr;
  83   unsigned char * endaddr = startaddr + len;
  84
  85   for (p = endaddr; p > startaddr;)
  86     {
  87       * -- p = val & 0xff;
  88       val >>= 8;
  89     }
  90 }
  91
  92 /* moxie register names.  */
  93 static const char *reg_names[16] =
  94   { "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5",
  95     "$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" };
  96
  97 /* The machine state.
  98
  99    This state is maintained in host byte order.  The fetch/store
 100    register functions must translate between host byte order and the
 101    target processor byte order.  Keeping this data in target byte
 102    order simplifies the register read/write functions.  Keeping this
 103    data in native order improves the performance of the simulator.
 104    Simulation speed is deemed more important.  */
 105
 106 #define NUM_MOXIE_REGS 17 /* Including PC */
 107 #define NUM_MOXIE_SREGS 256 /* The special registers */
 108 #define PC_REGNO     16
 109
 110 /* The ordering of the moxie_regset structure is matched in the
 111    gdb/config/moxie/tm-moxie.h file in the REGISTER_NAMES macro.  */
 112 struct moxie_regset
 113 {
 114   word            regs[NUM_MOXIE_REGS + 1]; /* primary registers */
 115   word            sregs[256];             /* special registers */
 116   word            cc;                   /* the condition code reg */
 117   int             exception;
 118   unsigned long long insts;                /* instruction counter */
 119 };
 120
 121 #define CC_GT  1<<0
 122 #define CC_LT  1<<1
 123 #define CC_EQ  1<<2
 124 #define CC_GTU 1<<3
 125 #define CC_LTU 1<<4
 126
 127 union
 128 {
 129   struct moxie_regset asregs;
 130   word asints [1];              /* but accessed larger... */
 131 } cpu;
 132
 133 static char *myname;
 134 static SIM_OPEN_KIND sim_kind;
 135 static int issue_messages = 0;
 136
 137 void
 138 sim_size (int s)
 139 {
 140 }
 141
 142 static void
 143 set_initial_gprs ()
 144 {
 145   int i;
 146   long space;
 147
 148   /* Set up machine just out of reset.  */
 149   cpu.asregs.regs[PC_REGNO] = 0;
 150
 151   /* Clean out the register contents.  */
 152   for (i = 0; i < NUM_MOXIE_REGS; i++)
 153     cpu.asregs.regs[i] = 0;
 154   for (i = 0; i < NUM_MOXIE_SREGS; i++)
 155     cpu.asregs.sregs[i] = 0;
 156 }
 157
 158 static void
 159 interrupt ()
 160 {
 161   cpu.asregs.exception = SIGINT;
 162 }
 163
 164 /* Write a 1 byte value to memory.  */
 165
 166 static void INLINE
 167 wbat (sim_cpu *scpu, word pc, word x, word v)
 168 {
 169   address_word cia = CIA_GET (scpu);
 170
 171   sim_core_write_aligned_1 (scpu, cia, write_map, x, v);
 172 }
 173
 174 /* Write a 2 byte value to memory.  */
 175
 176 static void INLINE
 177 wsat (sim_cpu *scpu, word pc, word x, word v)
 178 {
 179   address_word cia = CIA_GET (scpu);
 180
 181   sim_core_write_aligned_2 (scpu, cia, write_map, x, v);
 182 }
 183
 184 /* Write a 4 byte value to memory.  */
 185
 186 static void INLINE
 187 wlat (sim_cpu *scpu, word pc, word x, word v)
 188 {
 189   address_word cia = CIA_GET (scpu);
 190
 191   sim_core_write_aligned_4 (scpu, cia, write_map, x, v);
 192 }
 193
 194 /* Read 2 bytes from memory.  */
 195
 196 static int INLINE
 197 rsat (sim_cpu *scpu, word pc, word x)
 198 {
 199   address_word cia = CIA_GET (scpu);
 200
 201   return (sim_core_read_aligned_2 (scpu, cia, read_map, x));
 202 }
 203
 204 /* Read 1 byte from memory.  */
 205
 206 static int INLINE
 207 rbat (sim_cpu *scpu, word pc, word x)
 208 {
 209   address_word cia = CIA_GET (scpu);
 210
 211   return (sim_core_read_aligned_1 (scpu, cia, read_map, x));
 212 }
 213
 214 /* Read 4 bytes from memory.  */
 215
 216 static int INLINE
 217 rlat (sim_cpu *scpu, word pc, word x)
 218 {
 219   address_word cia = CIA_GET (scpu);
 220
 221   return (sim_core_read_aligned_4 (scpu, cia, read_map, x));
 222 }
 223
 224 #define CHECK_FLAG(T,H) if (tflags & T) { hflags |= H; tflags ^= T; }
 225
 226 unsigned int
 227 convert_target_flags (unsigned int tflags)
 228 {
 229   unsigned int hflags = 0x0;
 230
 231   CHECK_FLAG(0x0001, O_WRONLY);
 232   CHECK_FLAG(0x0002, O_RDWR);
 233   CHECK_FLAG(0x0008, O_APPEND);
 234   CHECK_FLAG(0x0200, O_CREAT);
 235   CHECK_FLAG(0x0400, O_TRUNC);
 236   CHECK_FLAG(0x0800, O_EXCL);
 237   CHECK_FLAG(0x2000, O_SYNC);
 238
 239   if (tflags != 0x0)
 240     fprintf (stderr,
 241              "Simulator Error: problem converting target open flags for host.  0x%x\n",
 242              tflags);
 243
 244   return hflags;
 245 }
 246
 247 #define TRACE(str) if (tracing) fprintf(tracefile,"0x%08x, %s, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", opc, str, cpu.asregs.regs[0], cpu.asregs.regs[1], cpu.asregs.regs[2], cpu.asregs.regs[3], cpu.asregs.regs[4], cpu.asregs.regs[5], cpu.asregs.regs[6], cpu.asregs.regs[7], cpu.asregs.regs[8], cpu.asregs.regs[9], cpu.asregs.regs[10], cpu.asregs.regs[11], cpu.asregs.regs[12], cpu.asregs.regs[13], cpu.asregs.regs[14], cpu.asregs.regs[15]);
 248
 249 static int tracing = 0;
 250
 251 void
 252 sim_resume (sd, step, siggnal)
 253      SIM_DESC sd;
 254      int step, siggnal;
 255 {
 256   word pc, opc;
 257   unsigned long long insts;
 258   unsigned short inst;
 259   void (* sigsave)();
 260   sim_cpu *scpu = STATE_CPU (sd, 0); /* FIXME */
 261   address_word cia = CIA_GET (scpu);
 262
 263   sigsave = signal (SIGINT, interrupt);
 264   cpu.asregs.exception = step ? SIGTRAP: 0;
 265   pc = cpu.asregs.regs[PC_REGNO];
 266   insts = cpu.asregs.insts;
 267
 268   /* Run instructions here. */
 269   do
 270     {
 271       opc = pc;
 272
 273       /* Fetch the instruction at pc.  */
 274       inst = (sim_core_read_aligned_1 (scpu, cia, read_map, pc) << 8)
 275         + sim_core_read_aligned_1 (scpu, cia, read_map, pc+1);
 276
 277       /* Decode instruction.  */
 278       if (inst & (1 << 15))
 279         {
 280           if (inst & (1 << 14))
 281             {
 282               /* This is a Form 3 instruction.  */
 283               int opcode = (inst >> 10 & 0xf);
 284
 285               switch (opcode)
 286                 {
 287                 case 0x00: /* beq */
 288                   {
 289                     TRACE("beq");
 290                     if (cpu.asregs.cc & CC_EQ)
 291                       pc += INST2OFFSET(inst) - 2;
 292                   }
 293                   break;
 294                 case 0x01: /* bne */
 295                   {
 296                     TRACE("bne");
 297                     if (! (cpu.asregs.cc & CC_EQ))
 298                       pc += INST2OFFSET(inst) - 2;
 299                   }
 300                   break;
 301                 case 0x02: /* blt */
 302                   {
 303                     TRACE("blt");
 304                     if (cpu.asregs.cc & CC_LT)
 305                       pc += INST2OFFSET(inst) - 2;
 306                   }               break;
 307                 case 0x03: /* bgt */
 308                   {
 309                     TRACE("bgt");
 310                     if (cpu.asregs.cc & CC_GT)
 311                       pc += INST2OFFSET(inst) - 2;
 312                   }
 313                   break;
 314                 case 0x04: /* bltu */
 315                   {
 316                     TRACE("bltu");
 317                     if (cpu.asregs.cc & CC_LTU)
 318                       pc += INST2OFFSET(inst) - 2;
 319                   }
 320                   break;
 321                 case 0x05: /* bgtu */
 322                   {
 323                     TRACE("bgtu");
 324                     if (cpu.asregs.cc & CC_GTU)
 325                       pc += INST2OFFSET(inst) - 2;
 326                   }
 327                   break;
 328                 case 0x06: /* bge */
 329                   {
 330                     TRACE("bge");
 331                     if (cpu.asregs.cc & (CC_GT | CC_EQ))
 332                       pc += INST2OFFSET(inst) - 2;
 333                   }
 334                   break;
 335                 case 0x07: /* ble */
 336                   {
 337                     TRACE("ble");
 338                     if (cpu.asregs.cc & (CC_LT | CC_EQ))
 339                       pc += INST2OFFSET(inst) - 2;
 340                   }
 341                   break;
 342                 case 0x08: /* bgeu */
 343                   {
 344                     TRACE("bgeu");
 345                     if (cpu.asregs.cc & (CC_GTU | CC_EQ))
 346                       pc += INST2OFFSET(inst) - 2;
 347                   }
 348                   break;
 349                 case 0x09: /* bleu */
 350                   {
 351                     TRACE("bleu");
 352                     if (cpu.asregs.cc & (CC_LTU | CC_EQ))
 353                       pc += INST2OFFSET(inst) - 2;
 354                   }
 355                   break;
 356                 default:
 357                   {
 358                     TRACE("SIGILL3");
 359                     cpu.asregs.exception = SIGILL;
 360                     break;
 361                   }
 362                 }
 363             }
 364           else
 365             {
 366               /* This is a Form 2 instruction.  */
 367               int opcode = (inst >> 12 & 0x3);
 368               switch (opcode)
 369                 {
 370                 case 0x00: /* inc */
 371                   {
 372                     int a = (inst >> 8) & 0xf;
 373                     unsigned av = cpu.asregs.regs[a];
 374                     unsigned v = (inst & 0xff);
 375                     TRACE("inc");
 376                     cpu.asregs.regs[a] = av + v;
 377                   }
 378                   break;
 379                 case 0x01: /* dec */
 380                   {
 381                     int a = (inst >> 8) & 0xf;
 382                     unsigned av = cpu.asregs.regs[a];
 383                     unsigned v = (inst & 0xff);
 384                     TRACE("dec");
 385                     cpu.asregs.regs[a] = av - v;
 386                   }
 387                   break;
 388                 case 0x02: /* gsr */
 389                   {
 390                     int a = (inst >> 8) & 0xf;
 391                     unsigned v = (inst & 0xff);
 392                     TRACE("gsr");
 393                     cpu.asregs.regs[a] = cpu.asregs.sregs[v];
 394                   }
 395                   break;
 396                 case 0x03: /* ssr */
 397                   {
 398                     int a = (inst >> 8) & 0xf;
 399                     unsigned v = (inst & 0xff);
 400                     TRACE("ssr");
 401                     cpu.asregs.sregs[v] = cpu.asregs.regs[a];
 402                   }
 403                   break;
 404                 default:
 405                   TRACE("SIGILL2");
 406                   cpu.asregs.exception = SIGILL;
 407                   break;
 408                 }
 409             }
 410         }
 411       else
 412         {
 413           /* This is a Form 1 instruction.  */
 414           int opcode = inst >> 8;
 415           switch (opcode)
 416             {
 417             case 0x00: /* nop */
 418               break;
 419             case 0x01: /* ldi.l (immediate) */
 420               {
 421                 int reg = (inst >> 4) & 0xf;
 422                 TRACE("ldi.l");
 423                 unsigned int val = EXTRACT_WORD(pc+2);
 424                 cpu.asregs.regs[reg] = val;
 425                 pc += 4;
 426               }
 427               break;
 428             case 0x02: /* mov (register-to-register) */
 429               {
 430                 int dest  = (inst >> 4) & 0xf;
 431                 int src = (inst ) & 0xf;
 432                 TRACE("mov");
 433                 cpu.asregs.regs[dest] = cpu.asregs.regs[src];
 434               }
 435               break;
 436             case 0x03: /* jsra */
 437               {
 438                 unsigned int fn = EXTRACT_WORD(pc+2);
 439                 unsigned int sp = cpu.asregs.regs[1];
 440                 TRACE("jsra");
 441                 /* Save a slot for the static chain.  */
 442                 sp -= 4;
 443
 444                 /* Push the return address.  */
 445                 sp -= 4;
 446                 wlat (scpu, opc, sp, pc + 6);
 447
 448                 /* Push the current frame pointer.  */
 449                 sp -= 4;
 450                 wlat (scpu, opc, sp, cpu.asregs.regs[0]);
 451
 452                 /* Uncache the stack pointer and set the pc and $fp.  */
 453                 cpu.asregs.regs[1] = sp;
 454                 cpu.asregs.regs[0] = sp;
 455                 pc = fn - 2;
 456               }
 457               break;
 458             case 0x04: /* ret */
 459               {
 460                 unsigned int sp = cpu.asregs.regs[0];
 461
 462                 TRACE("ret");
 463
 464                 /* Pop the frame pointer.  */
 465                 cpu.asregs.regs[0] = rlat (scpu, opc, sp);
 466                 sp += 4;
 467
 468                 /* Pop the return address.  */
 469                 pc = rlat (scpu, opc, sp) - 2;
 470                 sp += 4;
 471
 472                 /* Skip over the static chain slot.  */
 473                 sp += 4;
 474
 475                 /* Uncache the stack pointer.  */
 476                 cpu.asregs.regs[1] = sp;
 477               }
 478               break;
 479             case 0x05: /* add.l */
 480               {
 481                 int a = (inst >> 4) & 0xf;
 482                 int b = inst & 0xf;
 483                 unsigned av = cpu.asregs.regs[a];
 484                 unsigned bv = cpu.asregs.regs[b];
 485                 TRACE("add.l");
 486                 cpu.asregs.regs[a] = av + bv;
 487               }
 488               break;
 489             case 0x06: /* push */
 490               {
 491                 int a = (inst >> 4) & 0xf;
 492                 int b = inst & 0xf;
 493                 int sp = cpu.asregs.regs[a] - 4;
 494                 TRACE("push");
 495                 wlat (scpu, opc, sp, cpu.asregs.regs[b]);
 496                 cpu.asregs.regs[a] = sp;
 497               }
 498               break;
 499             case 0x07: /* pop */
 500               {
 501                 int a = (inst >> 4) & 0xf;
 502                 int b = inst & 0xf;
 503                 int sp = cpu.asregs.regs[a];
 504                 TRACE("pop");
 505                 cpu.asregs.regs[b] = rlat (scpu, opc, sp);
 506                 cpu.asregs.regs[a] = sp + 4;
 507               }
 508               break;
 509             case 0x08: /* lda.l */
 510               {
 511                 int reg = (inst >> 4) & 0xf;
 512                 unsigned int addr = EXTRACT_WORD(pc+2);
 513                 TRACE("lda.l");
 514                 cpu.asregs.regs[reg] = rlat (scpu, opc, addr);
 515                 pc += 4;
 516               }
 517               break;
 518             case 0x09: /* sta.l */
 519               {
 520                 int reg = (inst >> 4) & 0xf;
 521                 unsigned int addr = EXTRACT_WORD(pc+2);
 522                 TRACE("sta.l");
 523                 wlat (scpu, opc, addr, cpu.asregs.regs[reg]);
 524                 pc += 4;
 525               }
 526               break;
 527             case 0x0a: /* ld.l (register indirect) */
 528               {
 529                 int src  = inst & 0xf;
 530                 int dest = (inst >> 4) & 0xf;
 531                 int xv;
 532                 TRACE("ld.l");
 533                 xv = cpu.asregs.regs[src];
 534                 cpu.asregs.regs[dest] = rlat (scpu, opc, xv);
 535               }
 536               break;
 537             case 0x0b: /* st.l */
 538               {
 539                 int dest = (inst >> 4) & 0xf;
 540                 int val  = inst & 0xf;
 541                 TRACE("st.l");
 542                 wlat (scpu, opc, cpu.asregs.regs[dest], cpu.asregs.regs[val]);
 543               }
 544               break;
 545             case 0x0c: /* ldo.l */
 546               {
 547                 unsigned int addr = EXTRACT_WORD(pc+2);
 548                 int a = (inst >> 4) & 0xf;
 549                 int b = inst & 0xf;
 550                 TRACE("ldo.l");
 551                 addr += cpu.asregs.regs[b];
 552                 cpu.asregs.regs[a] = rlat (scpu, opc, addr);
 553                 pc += 4;
 554               }
 555               break;
 556             case 0x0d: /* sto.l */
 557               {
 558                 unsigned int addr = EXTRACT_WORD(pc+2);
 559                 int a = (inst >> 4) & 0xf;
 560                 int b = inst & 0xf;
 561                 TRACE("sto.l");
 562                 addr += cpu.asregs.regs[a];
 563                 wlat (scpu, opc, addr, cpu.asregs.regs[b]);
 564                 pc += 4;
 565               }
 566               break;
 567             case 0x0e: /* cmp */
 568               {
 569                 int a  = (inst >> 4) & 0xf;
 570                 int b  = inst & 0xf;
 571                 int cc = 0;
 572                 int va = cpu.asregs.regs[a];
 573                 int vb = cpu.asregs.regs[b];
 574
 575                 TRACE("cmp");
 576
 577                 if (va == vb)
 578                   cc = CC_EQ;
 579                 else
 580                   {
 581                     cc |= (va < vb ? CC_LT : 0);
 582                     cc |= (va > vb ? CC_GT : 0);
 583                     cc |= ((unsigned int) va < (unsigned int) vb ? CC_LTU : 0);
 584                     cc |= ((unsigned int) va > (unsigned int) vb ? CC_GTU : 0);
 585                   }
 586
 587                 cpu.asregs.cc = cc;
 588               }
 589               break;
 590             case 0x0f:
 591             case 0x10:
 592             case 0x11:
 593             case 0x12:
 594             case 0x13:
 595             case 0x14:
 596             case 0x15:
 597             case 0x16:
 598             case 0x17:
 599             case 0x18:
 600               {
 601                 opc = opcode;
 602                 TRACE("SIGILL0");
 603                 cpu.asregs.exception = SIGILL;
 604                 break;
 605               }
 606             case 0x19: /* jsr */
 607               {
 608                 unsigned int fn = cpu.asregs.regs[(inst >> 4) & 0xf];
 609                 unsigned int sp = cpu.asregs.regs[1];
 610
 611                 TRACE("jsr");
 612
 613                 /* Save a slot for the static chain.  */
 614                 sp -= 4;
 615
 616                 /* Push the return address.  */
 617                 sp -= 4;
 618                 wlat (scpu, opc, sp, pc + 2);
 619
 620                 /* Push the current frame pointer.  */
 621                 sp -= 4;
 622                 wlat (scpu, opc, sp, cpu.asregs.regs[0]);
 623
 624                 /* Uncache the stack pointer and set the fp & pc.  */
 625                 cpu.asregs.regs[1] = sp;
 626                 cpu.asregs.regs[0] = sp;
 627                 pc = fn - 2;
 628               }
 629               break;
 630             case 0x1a: /* jmpa */
 631               {
 632                 unsigned int tgt = EXTRACT_WORD(pc+2);
 633                 TRACE("jmpa");
 634                 pc = tgt - 2;
 635               }
 636               break;
 637             case 0x1b: /* ldi.b (immediate) */
 638               {
 639                 int reg = (inst >> 4) & 0xf;
 640
 641                 unsigned int val = EXTRACT_WORD(pc+2);
 642                 TRACE("ldi.b");
 643                 cpu.asregs.regs[reg] = val;
 644                 pc += 4;
 645               }
 646               break;
 647             case 0x1c: /* ld.b (register indirect) */
 648               {
 649                 int src  = inst & 0xf;
 650                 int dest = (inst >> 4) & 0xf;
 651                 int xv;
 652                 TRACE("ld.b");
 653                 xv = cpu.asregs.regs[src];
 654                 cpu.asregs.regs[dest] = rbat (scpu, opc, xv);
 655               }
 656               break;
 657             case 0x1d: /* lda.b */
 658               {
 659                 int reg = (inst >> 4) & 0xf;
 660                 unsigned int addr = EXTRACT_WORD(pc+2);
 661                 TRACE("lda.b");
 662                 cpu.asregs.regs[reg] = rbat (scpu, opc, addr);
 663                 pc += 4;
 664               }
 665               break;
 666             case 0x1e: /* st.b */
 667               {
 668                 int dest = (inst >> 4) & 0xf;
 669                 int val  = inst & 0xf;
 670                 TRACE("st.b");
 671                 wbat (scpu, opc, cpu.asregs.regs[dest], cpu.asregs.regs[val]);
 672               }
 673               break;
 674             case 0x1f: /* sta.b */
 675               {
 676                 int reg = (inst >> 4) & 0xf;
 677                 unsigned int addr = EXTRACT_WORD(pc+2);
 678                 TRACE("sta.b");
 679                 wbat (scpu, opc, addr, cpu.asregs.regs[reg]);
 680                 pc += 4;
 681               }
 682               break;
 683             case 0x20: /* ldi.s (immediate) */
 684               {
 685                 int reg = (inst >> 4) & 0xf;
 686
 687                 unsigned int val = EXTRACT_WORD(pc+2);
 688                 TRACE("ldi.s");
 689                 cpu.asregs.regs[reg] = val;
 690                 pc += 4;
 691               }
 692               break;
 693             case 0x21: /* ld.s (register indirect) */
 694               {
 695                 int src  = inst & 0xf;
 696                 int dest = (inst >> 4) & 0xf;
 697                 int xv;
 698                 TRACE("ld.s");
 699                 xv = cpu.asregs.regs[src];
 700                 cpu.asregs.regs[dest] = rsat (scpu, opc, xv);
 701               }
 702               break;
 703             case 0x22: /* lda.s */
 704               {
 705                 int reg = (inst >> 4) & 0xf;
 706                 unsigned int addr = EXTRACT_WORD(pc+2);
 707                 TRACE("lda.s");
 708                 cpu.asregs.regs[reg] = rsat (scpu, opc, addr);
 709                 pc += 4;
 710               }
 711               break;
 712             case 0x23: /* st.s */
 713               {
 714                 int dest = (inst >> 4) & 0xf;
 715                 int val  = inst & 0xf;
 716                 TRACE("st.s");
 717                 wsat (scpu, opc, cpu.asregs.regs[dest], cpu.asregs.regs[val]);
 718               }
 719               break;
 720             case 0x24: /* sta.s */
 721               {
 722                 int reg = (inst >> 4) & 0xf;
 723                 unsigned int addr = EXTRACT_WORD(pc+2);
 724                 TRACE("sta.s");
 725                 wsat (scpu, opc, addr, cpu.asregs.regs[reg]);
 726                 pc += 4;
 727               }
 728               break;
 729             case 0x25: /* jmp */
 730               {
 731                 int reg = (inst >> 4) & 0xf;
 732                 TRACE("jmp");
 733                 pc = cpu.asregs.regs[reg] - 2;
 734               }
 735               break;
 736             case 0x26: /* and */
 737               {
 738                 int a = (inst >> 4) & 0xf;
 739                 int b = inst & 0xf;
 740                 int av, bv;
 741                 TRACE("and");
 742                 av = cpu.asregs.regs[a];
 743                 bv = cpu.asregs.regs[b];
 744                 cpu.asregs.regs[a] = av & bv;
 745               }
 746               break;
 747             case 0x27: /* lshr */
 748               {
 749                 int a = (inst >> 4) & 0xf;
 750                 int b = inst & 0xf;
 751                 int av = cpu.asregs.regs[a];
 752                 int bv = cpu.asregs.regs[b];
 753                 TRACE("lshr");
 754                 cpu.asregs.regs[a] = (unsigned) ((unsigned) av >> bv);
 755               }
 756               break;
 757             case 0x28: /* ashl */
 758               {
 759                 int a = (inst >> 4) & 0xf;
 760                 int b = inst & 0xf;
 761                 int av = cpu.asregs.regs[a];
 762                 int bv = cpu.asregs.regs[b];
 763                 TRACE("ashl");
 764                 cpu.asregs.regs[a] = av << bv;
 765               }
 766               break;
 767             case 0x29: /* sub.l */
 768               {
 769                 int a = (inst >> 4) & 0xf;
 770                 int b = inst & 0xf;
 771                 unsigned av = cpu.asregs.regs[a];
 772                 unsigned bv = cpu.asregs.regs[b];
 773                 TRACE("sub.l");
 774                 cpu.asregs.regs[a] = av - bv;
 775               }
 776               break;
 777             case 0x2a: /* neg */
 778               {
 779                 int a  = (inst >> 4) & 0xf;
 780                 int b  = inst & 0xf;
 781                 int bv = cpu.asregs.regs[b];
 782                 TRACE("neg");
 783                 cpu.asregs.regs[a] = - bv;
 784               }
 785               break;
 786             case 0x2b: /* or */
 787               {
 788                 int a = (inst >> 4) & 0xf;
 789                 int b = inst & 0xf;
 790                 int av, bv;
 791                 TRACE("or");
 792                 av = cpu.asregs.regs[a];
 793                 bv = cpu.asregs.regs[b];
 794                 cpu.asregs.regs[a] = av | bv;
 795               }
 796               break;
 797             case 0x2c: /* not */
 798               {
 799                 int a = (inst >> 4) & 0xf;
 800                 int b = inst & 0xf;
 801                 int bv = cpu.asregs.regs[b];
 802                 TRACE("not");
 803                 cpu.asregs.regs[a] = 0xffffffff ^ bv;
 804               }
 805               break;
 806             case 0x2d: /* ashr */
 807               {
 808                 int a  = (inst >> 4) & 0xf;
 809                 int b  = inst & 0xf;
 810                 int av = cpu.asregs.regs[a];
 811                 int bv = cpu.asregs.regs[b];
 812                 TRACE("ashr");
 813                 cpu.asregs.regs[a] = av >> bv;
 814               }
 815               break;
 816             case 0x2e: /* xor */
 817               {
 818                 int a = (inst >> 4) & 0xf;
 819                 int b = inst & 0xf;
 820                 int av, bv;
 821                 TRACE("xor");
 822                 av = cpu.asregs.regs[a];
 823                 bv = cpu.asregs.regs[b];
 824                 cpu.asregs.regs[a] = av ^ bv;
 825               }
 826               break;
 827             case 0x2f: /* mul.l */
 828               {
 829                 int a = (inst >> 4) & 0xf;
 830                 int b = inst & 0xf;
 831                 unsigned av = cpu.asregs.regs[a];
 832                 unsigned bv = cpu.asregs.regs[b];
 833                 TRACE("mul.l");
 834                 cpu.asregs.regs[a] = av * bv;
 835               }
 836               break;
 837             case 0x30: /* swi */
 838               {
 839                 unsigned int inum = EXTRACT_WORD(pc+2);
 840                 TRACE("swi");
 841                 /* Set the special registers appropriately.  */
 842                 cpu.asregs.sregs[2] = 3; /* MOXIE_EX_SWI */
 843                 cpu.asregs.sregs[3] = inum;
 844                 switch (inum)
 845                   {
 846                   case 0x1: /* SYS_exit */
 847                     {
 848                       cpu.asregs.exception = SIGQUIT;
 849                       break;
 850                     }
 851                   case 0x2: /* SYS_open */
 852                     {
 853                       char fname[1024];
 854                       int mode = (int) convert_target_flags ((unsigned) cpu.asregs.regs[3]);
 855                       int perm = (int) cpu.asregs.regs[4];
 856                       int fd = open (fname, mode, perm);
 857                       sim_core_read_buffer (sd, scpu, read_map, fname,
 858                                             cpu.asregs.regs[2], 1024);
 859                       /* FIXME - set errno */
 860                       cpu.asregs.regs[2] = fd;
 861                       break;
 862                     }
 863                   case 0x4: /* SYS_read */
 864                     {
 865                       int fd = cpu.asregs.regs[2];
 866                       unsigned len = (unsigned) cpu.asregs.regs[4];
 867                       char *buf = malloc (len);
 868                       cpu.asregs.regs[2] = read (fd, buf, len);
 869                       sim_core_write_buffer (sd, scpu, write_map, buf,
 870                                              cpu.asregs.regs[3], len);
 871                       free (buf);
 872                       break;
 873                     }
 874                   case 0x5: /* SYS_write */
 875                     {
 876                       char *str;
 877                       /* String length is at 0x12($fp) */
 878                       unsigned count, len = (unsigned) cpu.asregs.regs[4];
 879                       str = malloc (len);
 880                       sim_core_read_buffer (sd, scpu, read_map, str,
 881                                             cpu.asregs.regs[3], len);
 882                       count = write (cpu.asregs.regs[2], str, len);
 883                       free (str);
 884                       cpu.asregs.regs[2] = count;
 885                       break;
 886                     }
 887                   case 0xffffffff: /* Linux System Call */
 888                     {
 889                       unsigned int handler = cpu.asregs.sregs[1];
 890                       unsigned int sp = cpu.asregs.regs[1];
 891
 892                       /* Save a slot for the static chain.  */
 893                       sp -= 4;
 894
 895                       /* Push the return address.  */
 896                       sp -= 4;
 897                       wlat (scpu, opc, sp, pc + 6);
 898
 899                       /* Push the current frame pointer.  */
 900                       sp -= 4;
 901                       wlat (scpu, opc, sp, cpu.asregs.regs[0]);
 902
 903                       /* Uncache the stack pointer and set the fp & pc.  */
 904                       cpu.asregs.regs[1] = sp;
 905                       cpu.asregs.regs[0] = sp;
 906                       pc = handler - 6;
 907                     }
 908                   default:
 909                     break;
 910                   }
 911                 pc += 4;
 912               }
 913               break;
 914             case 0x31: /* div.l */
 915               {
 916                 int a = (inst >> 4) & 0xf;
 917                 int b = inst & 0xf;
 918                 int av = cpu.asregs.regs[a];
 919                 int bv = cpu.asregs.regs[b];
 920                 TRACE("div.l");
 921                 cpu.asregs.regs[a] = av / bv;
 922               }
 923               break;
 924             case 0x32: /* udiv.l */
 925               {
 926                 int a = (inst >> 4) & 0xf;
 927                 int b = inst & 0xf;
 928                 unsigned int av = cpu.asregs.regs[a];
 929                 unsigned int bv = cpu.asregs.regs[b];
 930                 TRACE("udiv.l");
 931                 cpu.asregs.regs[a] = (av / bv);
 932               }
 933               break;
 934             case 0x33: /* mod.l */
 935               {
 936                 int a = (inst >> 4) & 0xf;
 937                 int b = inst & 0xf;
 938                 int av = cpu.asregs.regs[a];
 939                 int bv = cpu.asregs.regs[b];
 940                 TRACE("mod.l");
 941                 cpu.asregs.regs[a] = av % bv;
 942               }
 943               break;
 944             case 0x34: /* umod.l */
 945               {
 946                 int a = (inst >> 4) & 0xf;
 947                 int b = inst & 0xf;
 948                 unsigned int av = cpu.asregs.regs[a];
 949                 unsigned int bv = cpu.asregs.regs[b];
 950                 TRACE("umod.l");
 951                 cpu.asregs.regs[a] = (av % bv);
 952               }
 953               break;
 954             case 0x35: /* brk */
 955               TRACE("brk");
 956               cpu.asregs.exception = SIGTRAP;
 957               pc -= 2; /* Adjust pc */
 958               break;
 959             case 0x36: /* ldo.b */
 960               {
 961                 unsigned int addr = EXTRACT_WORD(pc+2);
 962                 int a = (inst >> 4) & 0xf;
 963                 int b = inst & 0xf;
 964                 TRACE("ldo.b");
 965                 addr += cpu.asregs.regs[b];
 966                 cpu.asregs.regs[a] = rbat (scpu, opc, addr);
 967                 pc += 4;
 968               }
 969               break;
 970             case 0x37: /* sto.b */
 971               {
 972                 unsigned int addr = EXTRACT_WORD(pc+2);
 973                 int a = (inst >> 4) & 0xf;
 974                 int b = inst & 0xf;
 975                 TRACE("sto.b");
 976                 addr += cpu.asregs.regs[a];
 977                 wbat (scpu, opc, addr, cpu.asregs.regs[b]);
 978                 pc += 4;
 979               }
 980               break;
 981             case 0x38: /* ldo.s */
 982               {
 983                 unsigned int addr = EXTRACT_WORD(pc+2);
 984                 int a = (inst >> 4) & 0xf;
 985                 int b = inst & 0xf;
 986                 TRACE("ldo.s");
 987                 addr += cpu.asregs.regs[b];
 988                 cpu.asregs.regs[a] = rsat (scpu, opc, addr);
 989                 pc += 4;
 990               }
 991               break;
 992             case 0x39: /* sto.s */
 993               {
 994                 unsigned int addr = EXTRACT_WORD(pc+2);
 995                 int a = (inst >> 4) & 0xf;
 996                 int b = inst & 0xf;
 997                 TRACE("sto.s");
 998                 addr += cpu.asregs.regs[a];
 999                 wsat (scpu, opc, addr, cpu.asregs.regs[b]);
1000                 pc += 4;
1001               }
1002               break;
1003             default:
1004               opc = opcode;
1005               TRACE("SIGILL1");
1006               cpu.asregs.exception = SIGILL;
1007               break;
1008             }
1009         }
1010
1011       insts++;
1012       pc += 2;
1013
1014     } while (!cpu.asregs.exception);
1015
1016   /* Hide away the things we've cached while executing.  */
1017   cpu.asregs.regs[PC_REGNO] = pc;
1018   cpu.asregs.insts += insts;            /* instructions done ... */
1019
1020   signal (SIGINT, sigsave);
1021 }
1022
1023 int
1024 sim_write (sd, addr, buffer, size)
1025      SIM_DESC sd;
1026      SIM_ADDR addr;
1027      unsigned char * buffer;
1028      int size;
1029 {
1030   sim_cpu *scpu = STATE_CPU (sd, 0); /* FIXME */
1031
1032   sim_core_write_buffer (sd, scpu, write_map, buffer, addr, size);
1033
1034   return size;
1035 }
1036
1037 int
1038 sim_read (sd, addr, buffer, size)
1039      SIM_DESC sd;
1040      SIM_ADDR addr;
1041      unsigned char * buffer;
1042      int size;
1043 {
1044   sim_cpu *scpu = STATE_CPU (sd, 0); /* FIXME */
1045
1046   sim_core_read_buffer (sd, scpu, read_map, buffer, addr, size);
1047
1048   return size;
1049 }
1050
1051
1052 int
1053 sim_store_register (sd, rn, memory, length)
1054      SIM_DESC sd;
1055      int rn;
1056      unsigned char * memory;
1057      int length;
1058 {
1059   if (rn < NUM_MOXIE_REGS && rn >= 0)
1060     {
1061       if (length == 4)
1062         {
1063           long ival;
1064
1065           /* misalignment safe */
1066           ival = moxie_extract_unsigned_integer (memory, 4);
1067           cpu.asints[rn] = ival;
1068         }
1069
1070       return 4;
1071     }
1072   else
1073     return 0;
1074 }
1075
1076 int
1077 sim_fetch_register (sd, rn, memory, length)
1078      SIM_DESC sd;
1079      int rn;
1080      unsigned char * memory;
1081      int length;
1082 {
1083   if (rn < NUM_MOXIE_REGS && rn >= 0)
1084     {
1085       if (length == 4)
1086         {
1087           long ival = cpu.asints[rn];
1088
1089           /* misalignment-safe */
1090           moxie_store_unsigned_integer (memory, 4, ival);
1091         }
1092
1093       return 4;
1094     }
1095   else
1096     return 0;
1097 }
1098
1099
1100 int
1101 sim_trace (sd)
1102      SIM_DESC sd;
1103 {
1104   if (tracefile == 0)
1105     tracefile = fopen("trace.csv", "wb");
1106
1107   tracing = 1;
1108
1109   sim_resume (sd, 0, 0);
1110
1111   tracing = 0;
1112
1113   return 1;
1114 }
1115
1116 void
1117 sim_stop_reason (sd, reason, sigrc)
1118      SIM_DESC sd;
1119      enum sim_stop * reason;
1120      int * sigrc;
1121 {
1122   if (cpu.asregs.exception == SIGQUIT)
1123     {
1124       * reason = sim_exited;
1125       * sigrc = cpu.asregs.regs[2];
1126     }
1127   else
1128     {
1129       * reason = sim_stopped;
1130       * sigrc = cpu.asregs.exception;
1131     }
1132 }
1133
1134
1135 int
1136 sim_stop (sd)
1137      SIM_DESC sd;
1138 {
1139   cpu.asregs.exception = SIGINT;
1140   return 1;
1141 }
1142
1143
1144 void
1145 sim_info (sd, verbose)
1146      SIM_DESC sd;
1147      int verbose;
1148 {
1149   callback->printf_filtered (callback, "\n\n# instructions executed  %llu\n",
1150                              cpu.asregs.insts);
1151 }
1152
1153
1154 SIM_DESC
1155 sim_open (kind, cb, abfd, argv)
1156      SIM_OPEN_KIND kind;
1157      host_callback * cb;
1158      struct bfd * abfd;
1159      char ** argv;
1160 {
1161   SIM_DESC sd = sim_state_alloc (kind, cb);
1162   printf ("0x%x 0x%x\n", sd, STATE_MAGIC(sd));
1163   SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
1164
1165   if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
1166     return 0;
1167
1168   sim_do_command(sd," memory region 0x00000000,0x4000000") ;
1169   sim_do_command(sd," memory region 0xE0000000,0x10000") ;
1170
1171   myname = argv[0];
1172   callback = cb;
1173
1174   if (kind == SIM_OPEN_STANDALONE)
1175     issue_messages = 1;
1176
1177   set_initial_gprs ();  /* Reset the GPR registers.  */
1178
1179   return sd;
1180 }
1181
1182 void
1183 sim_close (sd, quitting)
1184      SIM_DESC sd;
1185      int quitting;
1186 {
1187   /* nothing to do */
1188 }
1189
1190
1191 /* Load the device tree blob.  */
1192
1193 static void
1194 load_dtb (SIM_DESC sd, const char *filename)
1195 {
1196   int size = 0;
1197   FILE *f = fopen (filename, "rb");
1198   char *buf;
1199   sim_cpu *scpu = STATE_CPU (sd, 0); /* FIXME */
1200  if (f == NULL)
1201     {
1202       printf ("WARNING: ``%s'' could not be opened.\n", filename);
1203       return;
1204     }
1205   fseek (f, 0, SEEK_END);
1206   size = ftell(f);
1207   fseek (f, 0, SEEK_SET);
1208   buf = alloca (size);
1209   if (size != fread (buf, 1, size, f))
1210     {
1211       printf ("ERROR: error reading ``%s''.\n", filename);
1212       return;
1213     }
1214   sim_core_write_buffer (sd, scpu, write_map, buf, 0xE0000000, size);
1215   cpu.asregs.sregs[9] = 0xE0000000;
1216   fclose (f);
1217 }
1218
1219 SIM_RC
1220 sim_load (sd, prog, abfd, from_tty)
1221      SIM_DESC sd;
1222      char * prog;
1223      bfd * abfd;
1224      int from_tty;
1225 {
1226
1227   /* Do the right thing for ELF executables; this turns out to be
1228      just about the right thing for any object format that:
1229        - we crack using BFD routines
1230        - follows the traditional UNIX text/data/bss layout
1231        - calls the bss section ".bss".   */
1232
1233   extern bfd * sim_load_file (); /* ??? Don't know where this should live.  */
1234   bfd * prog_bfd;
1235
1236   {
1237     bfd * handle;
1238     handle = bfd_openr (prog, 0);       /* could be "moxie" */
1239
1240     if (!handle)
1241       {
1242         printf("``%s'' could not be opened.\n", prog);
1243         return SIM_RC_FAIL;
1244       }
1245
1246     /* Makes sure that we have an object file, also cleans gets the
1247        section headers in place.  */
1248     if (!bfd_check_format (handle, bfd_object))
1249       {
1250         /* wasn't an object file */
1251         bfd_close (handle);
1252         printf ("``%s'' is not appropriate object file.\n", prog);
1253         return SIM_RC_FAIL;
1254       }
1255
1256     /* Clean up after ourselves.  */
1257     bfd_close (handle);
1258   }
1259
1260   /* from sh -- dac */
1261   prog_bfd = sim_load_file (sd, myname, callback, prog, abfd,
1262                             sim_kind == SIM_OPEN_DEBUG,
1263                             0, sim_write);
1264   if (prog_bfd == NULL)
1265     return SIM_RC_FAIL;
1266
1267   if (abfd == NULL)
1268     bfd_close (prog_bfd);
1269
1270   return SIM_RC_OK;
1271 }
1272
1273 SIM_RC
1274 sim_create_inferior (sd, prog_bfd, argv, env)
1275      SIM_DESC sd;
1276      struct bfd * prog_bfd;
1277      char ** argv;
1278      char ** env;
1279 {
1280   char ** avp;
1281   int l, argc, i, tp;
1282   sim_cpu *scpu = STATE_CPU (sd, 0); /* FIXME */
1283
1284   /* Set the initial register set.  */
1285   l = issue_messages;
1286   issue_messages = 0;
1287   set_initial_gprs ();
1288   issue_messages = l;
1289
1290   cpu.asregs.regs[PC_REGNO] = bfd_get_start_address (prog_bfd);
1291
1292   /* Copy args into target memory.  */
1293   avp = argv;
1294   for (argc = 0; *avp; avp++)
1295     argc++;
1296
1297   /* Target memory looks like this:
1298      0x00000000 zero word
1299      0x00000004 argc word
1300      0x00000008 start of argv
1301      .
1302      0x0000???? end of argv
1303      0x0000???? zero word
1304      0x0000???? start of data pointed to by argv  */
1305
1306   wlat (scpu, 0, 0, 0);
1307   wlat (scpu, 0, 4, argc);
1308
1309   /* tp is the offset of our first argv data.  */
1310   tp = 4 + 4 + argc * 4 + 4;
1311
1312   for (i = 0; i < argc; i++)
1313     {
1314       /* Set the argv value.  */
1315       wlat (scpu, 0, 4 + 4 + i * 4, tp);
1316
1317       /* Store the string.  */
1318       sim_core_write_buffer (sd, scpu, write_map, argv[i],
1319                              tp, strlen(argv[i])+1);
1320       tp += strlen (argv[i]) + 1;
1321     }
1322
1323   wlat (scpu, 0, 4 + 4 + i * 4, 0);
1324
1325   load_dtb (sd, DTB);
1326
1327   return SIM_RC_OK;
1328 }
1329
1330 void
1331 sim_kill (sd)
1332      SIM_DESC sd;
1333 {
1334   if (tracefile)
1335     fclose(tracefile);
1336 }
1337
1338 void
1339 sim_do_command (sd, cmd)
1340      SIM_DESC sd;
1341      char * cmd;
1342 {
1343   if (sim_args_command (sd, cmd) != SIM_RC_OK)
1344     sim_io_printf (sd,
1345                    "Error: \"%s\" is not a valid moxie simulator command.\n",
1346                    cmd);
1347 }
1348
1349 void
1350 sim_set_callbacks (ptr)
1351      host_callback * ptr;
1352 {
1353   callback = ptr;
1354 }