sim/rx/mem.c

   1 /* mem.c --- memory for RX simulator.
   2
   3 Copyright (C) 2005-2024 Free Software Foundation, Inc.
   4 Contributed by Red Hat, Inc.
   5
   6 This file is part of the GNU simulators.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* This must come before any other includes.  */
  22 #include "defs.h"
  23
  24 /* This slows down the simulator and we get some false negatives from
  25    gcc, like when it uses a long-sized hole to hold a byte-sized
  26    variable, knowing that it doesn't care about the other bits.  But,
  27    if you need to track down a read-from-unitialized bug, set this to
  28    1.  */
  29 #define RDCHECK 0
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #include "opcode/rx.h"
  36 #include "mem.h"
  37 #include "cpu.h"
  38 #include "syscalls.h"
  39 #include "misc.h"
  40 #include "err.h"
  41
  42 #define L1_BITS  (10)
  43 #define L2_BITS  (10)
  44 #define OFF_BITS PAGE_BITS
  45
  46 #define L1_LEN  (1 << L1_BITS)
  47 #define L2_LEN  (1 << L2_BITS)
  48 #define OFF_LEN (1 << OFF_BITS)
  49
  50 static unsigned char **pt[L1_LEN];
  51 static unsigned char **ptr[L1_LEN];
  52 static RX_Opcode_Decoded ***ptdc[L1_LEN];
  53
  54 /* [ get=0/put=1 ][ byte size ] */
  55 static unsigned int mem_counters[2][5];
  56
  57 #define COUNT(isput,bytes)                                      \
  58   if (verbose && enable_counting) mem_counters[isput][bytes]++
  59
  60 void
  61 init_mem (void)
  62 {
  63   int i, j;
  64
  65   for (i = 0; i < L1_LEN; i++)
  66     if (pt[i])
  67       {
  68         for (j = 0; j < L2_LEN; j++)
  69           if (pt[i][j])
  70             free (pt[i][j]);
  71         free (pt[i]);
  72       }
  73   memset (pt, 0, sizeof (pt));
  74   memset (ptr, 0, sizeof (ptr));
  75   memset (mem_counters, 0, sizeof (mem_counters));
  76 }
  77
  78 unsigned char *
  79 rx_mem_ptr (unsigned long address, enum mem_ptr_action action)
  80 {
  81   int pt1 = (address >> (L2_BITS + OFF_BITS)) & ((1 << L1_BITS) - 1);
  82   int pt2 = (address >> OFF_BITS) & ((1 << L2_BITS) - 1);
  83   int pto = address & ((1 << OFF_BITS) - 1);
  84
  85   if (address == 0)
  86     execution_error (SIM_ERR_NULL_POINTER_DEREFERENCE, 0);
  87
  88   if (pt[pt1] == 0)
  89     {
  90       pt[pt1] = (unsigned char **) calloc (L2_LEN, sizeof (char **));
  91       ptr[pt1] = (unsigned char **) calloc (L2_LEN, sizeof (char **));
  92       ptdc[pt1] = (RX_Opcode_Decoded ***) calloc (L2_LEN, sizeof (RX_Opcode_Decoded ***));
  93     }
  94   if (pt[pt1][pt2] == 0)
  95     {
  96       if (action == MPA_READING)
  97         execution_error (SIM_ERR_READ_UNWRITTEN_PAGES, address);
  98
  99       pt[pt1][pt2] = (unsigned char *) calloc (OFF_LEN, 1);
 100       ptr[pt1][pt2] = (unsigned char *) calloc (OFF_LEN, 1);
 101       ptdc[pt1][pt2] = (RX_Opcode_Decoded **) calloc (OFF_LEN, sizeof(RX_Opcode_Decoded *));
 102     }
 103   else if (action == MPA_READING
 104            && ptr[pt1][pt2][pto] == MC_UNINIT)
 105     execution_error (SIM_ERR_READ_UNWRITTEN_BYTES, address);
 106
 107   if (action == MPA_WRITING)
 108     {
 109       int pto_dc;
 110       if (ptr[pt1][pt2][pto] == MC_PUSHED_PC)
 111         execution_error (SIM_ERR_CORRUPT_STACK, address);
 112       ptr[pt1][pt2][pto] = MC_DATA;
 113
 114       /* The instruction decoder doesn't store it's decoded instructions
 115          at word swapped addresses.  Therefore, when clearing the decode
 116          cache, we have to account for that here.  */
 117       pto_dc = pto ^ (rx_big_endian ? 3 : 0);
 118       if (ptdc[pt1][pt2][pto_dc])
 119         {
 120           free (ptdc[pt1][pt2][pto_dc]);
 121           ptdc[pt1][pt2][pto_dc] = NULL;
 122         }
 123     }
 124
 125   if (action == MPA_CONTENT_TYPE)
 126     return (unsigned char *) (ptr[pt1][pt2] + pto);
 127
 128   if (action == MPA_DECODE_CACHE)
 129     return (unsigned char *) (ptdc[pt1][pt2] + pto);
 130
 131   return pt[pt1][pt2] + pto;
 132 }
 133
 134 RX_Opcode_Decoded **
 135 rx_mem_decode_cache (unsigned long address)
 136 {
 137   return (RX_Opcode_Decoded **) rx_mem_ptr (address, MPA_DECODE_CACHE);
 138 }
 139
 140 static inline int
 141 is_reserved_address (unsigned int address)
 142 {
 143   return (address >= 0x00020000 && address < 0x00080000)
 144     ||   (address >= 0x00100000 && address < 0x01000000)
 145     ||   (address >= 0x08000000 && address < 0xff000000);
 146 }
 147
 148 static void
 149 used (int rstart, int i, int j)
 150 {
 151   int rend = i << (L2_BITS + OFF_BITS);
 152   rend += j << OFF_BITS;
 153   if (rstart == 0xe0000 && rend == 0xe1000)
 154     return;
 155   printf ("mem:   %08x - %08x (%dk bytes)\n", rstart, rend - 1,
 156           (rend - rstart) / 1024);
 157 }
 158
 159 static char *
 160 mcs (int isput, int bytes)
 161 {
 162   return comma (mem_counters[isput][bytes]);
 163 }
 164
 165 void
 166 mem_usage_stats (void)
 167 {
 168   int i, j;
 169   int rstart = 0;
 170   int pending = 0;
 171
 172   for (i = 0; i < L1_LEN; i++)
 173     if (pt[i])
 174       {
 175         for (j = 0; j < L2_LEN; j++)
 176           if (pt[i][j])
 177             {
 178               if (!pending)
 179                 {
 180                   pending = 1;
 181                   rstart = (i << (L2_BITS + OFF_BITS)) + (j << OFF_BITS);
 182                 }
 183             }
 184           else if (pending)
 185             {
 186               pending = 0;
 187               used (rstart, i, j);
 188             }
 189       }
 190     else
 191       {
 192         if (pending)
 193           {
 194             pending = 0;
 195             used (rstart, i, 0);
 196           }
 197       }
 198   /*       mem foo: 123456789012 123456789012 123456789012 123456789012
 199             123456789012 */
 200   printf ("                 byte        short        3byte         long"
 201           "       opcode\n");
 202   if (verbose > 1)
 203     {
 204       /* Only use comma separated numbers when being very verbose.
 205          Comma separated numbers are hard to parse in awk scripts.  */
 206       printf ("mem get: %12s %12s %12s %12s %12s\n", mcs (0, 1), mcs (0, 2),
 207               mcs (0, 3), mcs (0, 4), mcs (0, 0));
 208       printf ("mem put: %12s %12s %12s %12s\n", mcs (1, 1), mcs (1, 2),
 209               mcs (1, 3), mcs (1, 4));
 210     }
 211   else
 212     {
 213       printf ("mem get: %12u %12u %12u %12u %12u\n",
 214               mem_counters[0][1], mem_counters[0][2],
 215               mem_counters[0][3], mem_counters[0][4],
 216               mem_counters[0][0]);
 217       printf ("mem put: %12u %12u %12u %12u\n",
 218               mem_counters [1][1], mem_counters [1][2],
 219               mem_counters [1][3], mem_counters [1][4]);
 220     }
 221 }
 222
 223 unsigned long
 224 mem_usage_cycles (void)
 225 {
 226   unsigned long rv = mem_counters[0][0];
 227   rv += mem_counters[0][1] * 1;
 228   rv += mem_counters[0][2] * 2;
 229   rv += mem_counters[0][3] * 3;
 230   rv += mem_counters[0][4] * 4;
 231   rv += mem_counters[1][1] * 1;
 232   rv += mem_counters[1][2] * 2;
 233   rv += mem_counters[1][3] * 3;
 234   rv += mem_counters[1][4] * 4;
 235   return rv;
 236 }
 237
 238 static int tpr = 0;
 239 static void
 240 s (int address, char *dir)
 241 {
 242   if (tpr == 0)
 243     printf ("MEM[%08x] %s", address, dir);
 244   tpr++;
 245 }
 246
 247 #define S(d) if (trace) s(address, d)
 248 static void
 249 e (void)
 250 {
 251   if (!trace)
 252     return;
 253   tpr--;
 254   if (tpr == 0)
 255     printf ("\n");
 256 }
 257
 258 static char
 259 mtypec (int address)
 260 {
 261   unsigned char *cp = rx_mem_ptr (address, MPA_CONTENT_TYPE);
 262   return "udp"[*cp];
 263 }
 264
 265 #define E() if (trace) e()
 266
 267 static void
 268 mem_put_byte (unsigned int address, unsigned char value)
 269 {
 270   unsigned char *m;
 271   char tc = ' ';
 272
 273   if (trace)
 274     tc = mtypec (address);
 275   m = rx_mem_ptr (address, MPA_WRITING);
 276   if (trace)
 277     printf (" %02x%c", value, tc);
 278   *m = value;
 279   switch (address)
 280     {
 281     case 0x0008c02a: /* PA.DR */
 282      {
 283         static int old_led = -1;
 284         int red_on = 0;
 285         int i;
 286
 287         if (old_led != value)
 288           {
 289             fputs (" ", stdout);
 290             for (i = 0; i < 8; i++)
 291               if (value & (1 << i))
 292                 {
 293                   if (! red_on)
 294                     {
 295                       fputs ("\033[31m", stdout);
 296                       red_on = 1;
 297                     }
 298                   fputs (" @", stdout);
 299                 }
 300               else
 301                 {
 302                   if (red_on)
 303                     {
 304                       fputs ("\033[0m", stdout);
 305                       red_on = 0;
 306                     }
 307                   fputs (" *", stdout);
 308                 }
 309
 310             if (red_on)
 311               fputs ("\033[0m", stdout);
 312
 313             fputs ("\r", stdout);
 314             fflush (stdout);
 315             old_led = value;
 316           }
 317       }
 318       break;
 319
 320 #ifdef WITH_PROFILE
 321     case 0x0008c02b: /* PB.DR */
 322       {
 323         if (value == 0)
 324           halt_pipeline_stats ();
 325         else
 326           reset_pipeline_stats ();
 327         break;
 328       }
 329 #endif
 330
 331     case 0x00088263: /* SCI4.TDR */
 332       {
 333         static int pending_exit = 0;
 334         if (pending_exit == 2)
 335           {
 336             step_result = RX_MAKE_EXITED(value);
 337             longjmp (decode_jmp_buf, 1);
 338           }
 339         else if (value == 3)
 340           pending_exit ++;
 341         else
 342           pending_exit = 0;
 343
 344         putchar(value);
 345       }
 346       break;
 347
 348     default:
 349       if (is_reserved_address (address))
 350         generate_access_exception ();
 351     }
 352 }
 353
 354 void
 355 mem_put_qi (int address, unsigned char value)
 356 {
 357   S ("<=");
 358   mem_put_byte (address, value & 0xff);
 359   E ();
 360   COUNT (1, 1);
 361 }
 362
 363 #ifdef CYCLE_ACCURATE
 364 static int tpu_base;
 365 #endif
 366
 367 void
 368 mem_put_hi (int address, unsigned short value)
 369 {
 370   S ("<=");
 371   switch (address)
 372     {
 373 #ifdef CYCLE_ACCURATE
 374     case 0x00088126: /* TPU1.TCNT */
 375       tpu_base = regs.cycle_count;
 376       break;
 377     case 0x00088136: /* TPU2.TCNT */
 378       tpu_base = regs.cycle_count;
 379       break;
 380 #endif
 381     default:
 382       if (rx_big_endian)
 383         {
 384           mem_put_byte (address, value >> 8);
 385           mem_put_byte (address + 1, value & 0xff);
 386         }
 387       else
 388         {
 389           mem_put_byte (address, value & 0xff);
 390           mem_put_byte (address + 1, value >> 8);
 391         }
 392     }
 393   E ();
 394   COUNT (1, 2);
 395 }
 396
 397 void
 398 mem_put_psi (int address, unsigned long value)
 399 {
 400   S ("<=");
 401   if (rx_big_endian)
 402     {
 403       mem_put_byte (address, value >> 16);
 404       mem_put_byte (address + 1, (value >> 8) & 0xff);
 405       mem_put_byte (address + 2, value & 0xff);
 406     }
 407   else
 408     {
 409       mem_put_byte (address, value & 0xff);
 410       mem_put_byte (address + 1, (value >> 8) & 0xff);
 411       mem_put_byte (address + 2, value >> 16);
 412     }
 413   E ();
 414   COUNT (1, 3);
 415 }
 416
 417 void
 418 mem_put_si (int address, unsigned long value)
 419 {
 420   S ("<=");
 421   if (rx_big_endian)
 422     {
 423       mem_put_byte (address + 0, (value >> 24) & 0xff);
 424       mem_put_byte (address + 1, (value >> 16) & 0xff);
 425       mem_put_byte (address + 2, (value >> 8) & 0xff);
 426       mem_put_byte (address + 3, value & 0xff);
 427     }
 428   else
 429     {
 430       mem_put_byte (address + 0, value & 0xff);
 431       mem_put_byte (address + 1, (value >> 8) & 0xff);
 432       mem_put_byte (address + 2, (value >> 16) & 0xff);
 433       mem_put_byte (address + 3, (value >> 24) & 0xff);
 434     }
 435   E ();
 436   COUNT (1, 4);
 437 }
 438
 439 void
 440 mem_put_blk (int address, void *bufptr_void, int nbytes)
 441 {
 442   unsigned char *bufptr = (unsigned char *) bufptr_void;
 443
 444   S ("<=");
 445   if (enable_counting)
 446     mem_counters[1][1] += nbytes;
 447   while (nbytes--)
 448     mem_put_byte (address++, *bufptr++);
 449   E ();
 450 }
 451
 452 unsigned char
 453 mem_get_pc (int address)
 454 {
 455   unsigned char *m = rx_mem_ptr (address, MPA_READING);
 456   COUNT (0, 0);
 457   return *m;
 458 }
 459
 460 static unsigned char
 461 mem_get_byte (unsigned int address)
 462 {
 463   unsigned char *m;
 464
 465   S ("=>");
 466   m = rx_mem_ptr (address, MPA_READING);
 467   switch (address)
 468     {
 469     case 0x00088264: /* SCI4.SSR */
 470       E();
 471       return 0x04; /* transmitter empty */
 472       break;
 473     default:
 474       if (trace)
 475         printf (" %02x%c", *m, mtypec (address));
 476       if (is_reserved_address (address))
 477         generate_access_exception ();
 478       break;
 479     }
 480   E ();
 481   return *m;
 482 }
 483
 484 unsigned char
 485 mem_get_qi (int address)
 486 {
 487   unsigned char rv;
 488   S ("=>");
 489   rv = mem_get_byte (address);
 490   COUNT (0, 1);
 491   E ();
 492   return rv;
 493 }
 494
 495 unsigned short
 496 mem_get_hi (int address)
 497 {
 498   unsigned short rv;
 499   S ("=>");
 500   switch (address)
 501     {
 502 #ifdef CYCLE_ACCURATE
 503     case 0x00088126: /* TPU1.TCNT */
 504       rv = (regs.cycle_count - tpu_base) >> 16;
 505       break;
 506     case 0x00088136: /* TPU2.TCNT */
 507       rv = (regs.cycle_count - tpu_base) >> 0;
 508       break;
 509 #endif
 510
 511     default:
 512       if (rx_big_endian)
 513         {
 514           rv = mem_get_byte (address) << 8;
 515           rv |= mem_get_byte (address + 1);
 516         }
 517       else
 518         {
 519           rv = mem_get_byte (address);
 520           rv |= mem_get_byte (address + 1) << 8;
 521         }
 522     }
 523   COUNT (0, 2);
 524   E ();
 525   return rv;
 526 }
 527
 528 unsigned long
 529 mem_get_psi (int address)
 530 {
 531   unsigned long rv;
 532   S ("=>");
 533   if (rx_big_endian)
 534     {
 535       rv = mem_get_byte (address + 2);
 536       rv |= mem_get_byte (address + 1) << 8;
 537       rv |= mem_get_byte (address) << 16;
 538     }
 539   else
 540     {
 541       rv = mem_get_byte (address);
 542       rv |= mem_get_byte (address + 1) << 8;
 543       rv |= mem_get_byte (address + 2) << 16;
 544     }
 545   COUNT (0, 3);
 546   E ();
 547   return rv;
 548 }
 549
 550 unsigned long
 551 mem_get_si (int address)
 552 {
 553   unsigned long rv;
 554   S ("=>");
 555   if (rx_big_endian)
 556     {
 557       rv = mem_get_byte (address + 3);
 558       rv |= mem_get_byte (address + 2) << 8;
 559       rv |= mem_get_byte (address + 1) << 16;
 560       rv |= mem_get_byte (address) << 24;
 561     }
 562   else
 563     {
 564       rv = mem_get_byte (address);
 565       rv |= mem_get_byte (address + 1) << 8;
 566       rv |= mem_get_byte (address + 2) << 16;
 567       rv |= mem_get_byte (address + 3) << 24;
 568     }
 569   COUNT (0, 4);
 570   E ();
 571   return rv;
 572 }
 573
 574 void
 575 mem_get_blk (int address, void *bufptr_void, int nbytes)
 576 {
 577   char *bufptr = (char *) bufptr_void;
 578
 579   S ("=>");
 580   if (enable_counting)
 581     mem_counters[0][1] += nbytes;
 582   while (nbytes--)
 583     *bufptr++ = mem_get_byte (address++);
 584   E ();
 585 }
 586
 587 int
 588 sign_ext (int v, int bits)
 589 {
 590   if (bits < 32)
 591     {
 592       v &= (1 << bits) - 1;
 593       if (v & (1 << (bits - 1)))
 594         v -= (1 << bits);
 595     }
 596   return v;
 597 }
 598
 599 void
 600 mem_set_content_type (int address, enum mem_content_type type)
 601 {
 602   unsigned char *mt = rx_mem_ptr (address, MPA_CONTENT_TYPE);
 603   *mt = type;
 604 }
 605
 606 void
 607 mem_set_content_range (int start_address, int end_address, enum mem_content_type type)
 608 {
 609   while (start_address < end_address)
 610     {
 611       int sz, ofs;
 612       unsigned char *mt;
 613
 614       sz = end_address - start_address;
 615       ofs = start_address % L1_LEN;
 616       if (sz + ofs > L1_LEN)
 617         sz = L1_LEN - ofs;
 618
 619       mt = rx_mem_ptr (start_address, MPA_CONTENT_TYPE);
 620       memset (mt, type, sz);
 621
 622       start_address += sz;
 623     }
 624 }
 625
 626 enum mem_content_type
 627 mem_get_content_type (int address)
 628 {
 629   unsigned char *mt = rx_mem_ptr (address, MPA_CONTENT_TYPE);
 630   return *mt;
 631 }