gnu/dist/gdb6/sim/m32c/opc2c.c

   1 /* opc2c.c --- generate C simulator code from from .opc file
   2
   3 Copyright (C) 2005 Free Software Foundation, Inc.
   4 Contributed by Red Hat, Inc.
   5
   6 This file is part of the GNU simulators.
   7
   8 The GNU simulators are free software; you can redistribute them and/or
   9 modify them under the terms of the GNU General Public License as
  10 published by the Free Software Foundation; either version 2 of the
  11 License, or (at your option) any later version.
  12
  13 The GNU simulators are distributed in the hope that they will be
  14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16 General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with the GNU simulators; if not, write to the Free Software
  20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21 02110-1301, USA  */
  22
  23
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27 #include <stdlib.h>
  28
  29 #include "safe-fgets.h"
  30
  31 static int errors = 0;
  32
  33 #define MAX_BYTES 10
  34
  35 typedef struct
  36 {
  37   int varyno:16;
  38   int byte:8;
  39   int shift:8;
  40 } VaryRef;
  41
  42 typedef struct
  43 {
  44   char nbytes;
  45   char dbytes;
  46   char id[MAX_BYTES * 8 + 1];
  47   unsigned char var_start[MAX_BYTES * 8 + 1];
  48   struct
  49   {
  50     unsigned char decodable_mask;
  51     unsigned char decodable_bits;
  52   } b[MAX_BYTES];
  53   char *comment;
  54   int lineno;
  55   int nlines;
  56   char **lines;
  57   struct Indirect *last_ind;
  58   int semantics_label;
  59   int nvaries;
  60   VaryRef *vary;
  61 } opcode;
  62
  63 int n_opcodes;
  64 opcode **opcodes;
  65 opcode *op;
  66
  67 typedef struct
  68 {
  69   char *name;
  70   int nlen;
  71   unsigned char mask;
  72   int n_patterns;
  73   unsigned char *patterns;
  74 } Vary;
  75
  76 Vary **vary = 0;
  77 int n_varies = 0;
  78
  79 unsigned char cur_bits[MAX_BYTES + 1];
  80
  81 char *orig_filename;
  82
  83 FILE *sim_log = 0;
  84 #define lprintf if (sim_log) fprintf
  85
  86 opcode prefix_text, suffix_text;
  87
  88 typedef enum
  89 {
  90   T_unused,
  91   T_op,
  92   T_indirect,
  93   T_done
  94 } OpType;
  95
  96 typedef struct Indirect
  97 {
  98   OpType type;
  99   union
 100   {
 101     struct Indirect *ind;
 102     opcode *op;
 103   } u;
 104 } Indirect;
 105
 106 Indirect indirect[256];
 107
 108 static int
 109 next_varybits (int bits, opcode * op, int byte)
 110 {
 111   int mask = op->b[byte].decodable_mask;
 112   int i;
 113
 114   for (i = 0; i < 8; i++)
 115     if (!(mask & (1 << i)))
 116       {
 117         if (bits & (1 << i))
 118           {
 119             bits &= ~(1 << i);
 120           }
 121         else
 122           {
 123             bits |= (1 << i);
 124             return bits;
 125           }
 126       }
 127   return 0;
 128 }
 129
 130 static int
 131 valid_varybits (int bits, opcode * op, int byte)
 132 {
 133   if (op->nvaries)
 134     {
 135       int vn;
 136       for (vn = 0; vn < op->nvaries; vn++)
 137         {
 138           int found = 0;
 139           int i;
 140           int ob;
 141
 142           if (byte != op->vary[vn].byte)
 143             continue;
 144           Vary *v = vary[op->vary[vn].varyno];
 145           ob = (bits >> op->vary[vn].shift) & v->mask;
 146           lprintf (sim_log, "varybits: vary %s ob %x\n", v->name, ob);
 147
 148           for (i = 0; i < v->n_patterns; i++)
 149             if (ob == v->patterns[i])
 150               {
 151                 lprintf (sim_log, "  found at %d\n", i);
 152                 found = 1;
 153                 break;
 154               }
 155           if (!found)
 156             return 0;
 157         }
 158     }
 159   return 1;
 160 }
 161
 162 char *
 163 prmb (int mask, int bits)
 164 {
 165   static char buf[8][30];
 166   static int bn = 0;
 167   char *bp;
 168
 169   bn = (bn + 1) % 8;
 170   bp = buf[bn];
 171   int i;
 172   for (i = 0; i < 8; i++)
 173     {
 174       int bit = 0x80 >> i;
 175       if (!(mask & bit))
 176         *bp++ = '-';
 177       else if (bits & bit)
 178         *bp++ = '1';
 179       else
 180         *bp++ = '0';
 181       if (i % 4 == 3)
 182         *bp++ = ' ';
 183     }
 184   *--bp = 0;
 185   return buf[bn];
 186 }
 187
 188 static int
 189 op_cmp (const void *va, const void *vb)
 190 {
 191   const opcode *a = *(const opcode **) va;
 192   const opcode *b = *(const opcode **) vb;
 193
 194   if (a->nbytes != b->nbytes)
 195     return a->nbytes - b->nbytes;
 196
 197   return strcmp (a->id, b->id);
 198 }
 199
 200 void
 201 dump_lines (opcode * op, int level, Indirect * ind)
 202 {
 203   char *varnames[40];
 204   int i, vn = 0;
 205
 206   if (op->semantics_label)
 207     {
 208       printf ("%*sgoto op_semantics_%d;\n", level, "", op->semantics_label);
 209       return;
 210     }
 211
 212   if (ind != op->last_ind)
 213     {
 214       static int labelno = 0;
 215       labelno++;
 216       printf ("%*sop_semantics_%d:\n", level, "", labelno);
 217       op->semantics_label = labelno;
 218     }
 219
 220   if (op->comment)
 221     {
 222       level += 2;
 223       printf ("%*s{\n", level, "");
 224       printf ("%*s  %s\n", level, "", op->comment);
 225     }
 226
 227   for (i = 0; i < op->nbytes * 8;)
 228     {
 229       if (isalpha (op->id[i]))
 230         {
 231           int byte = i >> 3;
 232           int mask = 0;
 233           int shift = 0;
 234           char name[33];
 235           char *np = name;
 236           while (op->id[i] && isalpha (op->id[i]))
 237             {
 238               mask = (mask << 1) | 1;
 239               shift = 7 - (i & 7);
 240               *np++ = op->id[i++];
 241               if (op->var_start[i])
 242                 break;
 243             }
 244           *np = 0;
 245           varnames[vn++] = strdup (name);
 246           printf ("#line %d \"%s\"\n", op->lineno, orig_filename);
 247           if (mask & ~0xff)
 248             {
 249               fprintf (stderr, "Error: variable %s spans bytes: %s\n",
 250                        name, op->comment);
 251               errors++;
 252             }
 253           else if (shift && (mask != 0xff))
 254             printf ("%*s  int %s AU = (op[%d] >> %d) & 0x%02x;\n",
 255                     level, "", name, byte, shift, mask);
 256           else if (mask != 0xff)
 257             printf ("%*s  int %s AU = op[%d] & 0x%02x;\n",
 258                     level, "", name, byte, mask);
 259           else
 260             printf ("%*s  int %s AU = op[%d];\n", level, "", name, byte);
 261         }
 262       else
 263         i++;
 264     }
 265   if (op->comment)
 266     {
 267       printf ("%*s  if (trace) {\n", level, "");
 268       printf ("%*s      printf(\"\\033[33m%%s\\033[0m ", level, "");
 269       for (i = 0; i < op->nbytes; i++)
 270         printf (" %%02x");
 271       printf ("\\n\"");
 272       printf (",\n%*s             \"%s\"", level, "", op->comment);
 273       for (i = 0; i < op->nbytes; i++)
 274         {
 275           if (i == 0)
 276             printf (",\n%*s             op[%d]", level, "", i);
 277           else
 278             printf (", op[%d]", i);
 279         }
 280       printf (");\n");
 281       for (i = 0; i < vn; i++)
 282         printf ("%*s      printf(\"  %s = 0x%%x%s\", %s);\n", level, "",
 283                 varnames[i], (i < vn - 1) ? "," : "\\n", varnames[i]);
 284       printf ("%*s    }\n", level, "");
 285     }
 286   printf ("#line %d \"%s\"\n", op->lineno + 1, orig_filename);
 287   for (i = 0; i < op->nlines; i++)
 288     printf ("%*s%s", level, "", op->lines[i]);
 289   if (op->comment)
 290     printf ("%*s}\n", level, "");
 291 }
 292
 293 void
 294 store_opcode_bits (opcode * op, int byte, Indirect * ind)
 295 {
 296   int bits = op->b[byte].decodable_bits;
 297
 298   do
 299     {
 300       if (!valid_varybits (bits, op, byte))
 301         continue;
 302
 303       switch (ind[bits].type)
 304         {
 305         case T_unused:
 306           if (byte == op->dbytes - 1)
 307             {
 308               ind[bits].type = T_op;
 309               ind[bits].u.op = op;
 310               op->last_ind = ind;
 311               break;
 312             }
 313           else
 314             {
 315               int i2;
 316               ind[bits].type = T_indirect;
 317               ind[bits].u.ind = (Indirect *) malloc (256 * sizeof (Indirect));
 318               for (i2 = 0; i2 < 256; i2++)
 319                 ind[bits].u.ind[i2].type = T_unused;
 320               store_opcode_bits (op, byte + 1, ind[bits].u.ind);
 321             }
 322           break;
 323
 324         case T_indirect:
 325           if (byte < op->dbytes - 1)
 326             store_opcode_bits (op, byte + 1, ind[bits].u.ind);
 327           break;
 328
 329         case T_op:
 330           break;
 331
 332         case T_done:
 333           break;
 334         }
 335     }
 336   while ((bits = next_varybits (bits, op, byte)) != 0);
 337 }
 338
 339 void
 340 emit_indirect (Indirect * ind, int byte)
 341 {
 342   int unsup = 0;
 343   int j, n, mask;
 344
 345   mask = 0;
 346   for (j = 0; j < 256; j++)
 347     {
 348       switch (ind[j].type)
 349         {
 350         case T_indirect:
 351           mask = 0xff;
 352           break;
 353         case T_op:
 354           mask |= ind[j].u.op->b[byte].decodable_mask;
 355           break;
 356         case T_done:
 357         case T_unused:
 358           break;
 359         }
 360     }
 361
 362   printf ("%*s  GETBYTE();\n", byte * 6, "");
 363   printf ("%*s  switch (op[%d] & 0x%02x) {\n", byte * 6, "", byte, mask);
 364   for (j = 0; j < 256; j++)
 365     if ((j & ~mask) == 0)
 366       {
 367         switch (ind[j].type)
 368           {
 369           case T_done:
 370             break;
 371           case T_unused:
 372             unsup = 1;
 373             break;
 374           case T_op:
 375             for (n = j; n < 256; n++)
 376               if ((n & ~mask) == 0
 377                   && ind[n].type == T_op && ind[n].u.op == ind[j].u.op)
 378                 {
 379                   ind[n].type = T_done;
 380                   printf ("%*s    case 0x%02x:\n", byte * 6, "", n);
 381                 }
 382             for (n = byte; n < ind[j].u.op->nbytes - 1; n++)
 383               printf ("%*s      GETBYTE();\n", byte * 6, "");
 384             dump_lines (ind[j].u.op, byte * 6 + 6, ind);
 385             printf ("%*s      break;\n", byte * 6, "");
 386             break;
 387           case T_indirect:
 388             printf ("%*s    case 0x%02x:\n", byte * 6, "", j);
 389             emit_indirect (ind[j].u.ind, byte + 1);
 390             printf ("%*s      break;\n", byte * 6, "");
 391             break;
 392           }
 393       }
 394   if (unsup)
 395     printf ("%*s    default: UNSUPPORTED(); break;\n", byte * 6, "");
 396   printf ("%*s  }\n", byte * 6, "");
 397 }
 398
 399 static char *
 400 pv_dup (char *p, char *ep)
 401 {
 402   int n = ep - p;
 403   char *rv = (char *) malloc (n + 1);
 404   memcpy (rv, p, n);
 405   rv[n] = 0;
 406   return rv;
 407 }
 408
 409 static unsigned char
 410 str2mask (char *str, char *ep)
 411 {
 412   unsigned char rv = 0;
 413   while (str < ep)
 414     {
 415       rv *= 2;
 416       if (*str == '1')
 417         rv += 1;
 418       str++;
 419     }
 420   return rv;
 421 }
 422
 423 static void
 424 process_vary (char *line)
 425 {
 426   char *cp, *ep;
 427   Vary *v = (Vary *) malloc (sizeof (Vary));
 428
 429   n_varies++;
 430   if (vary)
 431     vary = (Vary **) realloc (vary, n_varies * sizeof (Vary *));
 432   else
 433     vary = (Vary **) malloc (n_varies * sizeof (Vary *));
 434   vary[n_varies - 1] = v;
 435
 436   cp = line;
 437
 438   for (cp = line; isspace (*cp); cp++);
 439   for (ep = cp; *ep && !isspace (*ep); ep++);
 440
 441   v->name = pv_dup (cp, ep);
 442   v->nlen = strlen (v->name);
 443   v->mask = (1 << v->nlen) - 1;
 444
 445   v->n_patterns = 0;
 446   v->patterns = (unsigned char *) malloc (1);
 447   while (1)
 448     {
 449       for (cp = ep; isspace (*cp); cp++);
 450       if (!isdigit (*cp))
 451         break;
 452       for (ep = cp; *ep && !isspace (*ep); ep++);
 453       v->n_patterns++;
 454       v->patterns = (unsigned char *) realloc (v->patterns, v->n_patterns);
 455       v->patterns[v->n_patterns - 1] = str2mask (cp, ep);
 456     }
 457 }
 458
 459 static int
 460 fieldcmp (opcode * op, int bit, char *name)
 461 {
 462   int n = strlen (name);
 463   if (memcmp (op->id + bit, name, n) == 0
 464       && (!isalpha (op->id[bit + n]) || op->var_start[bit + n]))
 465     return 1;
 466   return 0;
 467 }
 468
 469 static void
 470 log_indirect (Indirect * ind, int byte)
 471 {
 472   int i, j;
 473   char *last_c = 0;
 474
 475   for (i = 0; i < 256; i++)
 476     {
 477       if (ind[i].type == T_unused)
 478         continue;
 479
 480       for (j = 0; j < byte; j++)
 481         fprintf (sim_log, "%s ", prmb (255, cur_bits[j]));
 482       fprintf (sim_log, "%s ", prmb (255, i));
 483
 484       switch (ind[i].type)
 485         {
 486         case T_op:
 487         case T_done:
 488           if (last_c && (ind[i].u.op->comment == last_c))
 489             fprintf (sim_log, "''\n");
 490           else
 491             fprintf (sim_log, "%s\n", ind[i].u.op->comment);
 492           last_c = ind[i].u.op->comment;
 493           break;
 494         case T_unused:
 495           fprintf (sim_log, "-\n");
 496           break;
 497         case T_indirect:
 498           fprintf (sim_log, "indirect\n");
 499           cur_bits[byte] = i;
 500           log_indirect (ind[i].u.ind, byte + 1);
 501           last_c = 0;
 502           break;
 503         }
 504     }
 505 }
 506
 507 int
 508 main (int argc, char **argv)
 509 {
 510   char *line;
 511   FILE *in;
 512   int lineno = 0;
 513   int i;
 514   VaryRef *vlist;
 515
 516   if (argc > 2 && strcmp (argv[1], "-l") == 0)
 517     {
 518       sim_log = fopen (argv[2], "w");
 519       fprintf (stderr, "sim_log: %s\n", argv[2]);
 520       argc -= 2;
 521       argv += 2;
 522     }
 523
 524   if (argc < 2)
 525     {
 526       fprintf (stderr, "usage: opc2c infile.opc > outfile.opc\n");
 527       exit (1);
 528     }
 529
 530   orig_filename = argv[1];
 531   in = fopen (argv[1], "r");
 532   if (!in)
 533     {
 534       fprintf (stderr, "Unable to open file %s for reading\n", argv[1]);
 535       perror ("The error was");
 536       exit (1);
 537     }
 538
 539   n_opcodes = 0;
 540   opcodes = (opcode **) malloc (sizeof (opcode *));
 541   op = &prefix_text;
 542   op->lineno = 1;
 543   while ((line = safe_fgets (in)) != 0)
 544     {
 545       lineno++;
 546       if (strncmp (line, "  /** ", 6) == 0
 547           && (isdigit (line[6]) || memcmp (line + 6, "VARY", 4) == 0))
 548         line += 2;
 549       if (line[0] == '/' && line[1] == '*' && line[2] == '*')
 550         {
 551           if (strncmp (line, "/** */", 6) == 0)
 552             {
 553               op = &suffix_text;
 554               op->lineno = lineno;
 555             }
 556           else if (strncmp (line, "/** VARY ", 9) == 0)
 557             process_vary (line + 9);
 558           else
 559             {
 560               char *lp;
 561               int i, bit, byte;
 562               int var_start = 1;
 563
 564               n_opcodes++;
 565               opcodes =
 566                 (opcode **) realloc (opcodes, n_opcodes * sizeof (opcode *));
 567               op = (opcode *) malloc (sizeof (opcode));
 568               opcodes[n_opcodes - 1] = op;
 569
 570               op->nbytes = op->dbytes = 0;
 571               memset (op->id, 0, sizeof (op->id));
 572               memset (op->var_start, 0, sizeof (op->var_start));
 573               for (i = 0; i < MAX_BYTES; i++)
 574                 {
 575                   op->b[i].decodable_mask = 0;
 576                   op->b[i].decodable_bits = 0;
 577                 }
 578               op->comment = strdup (line);
 579               op->comment[strlen (op->comment) - 1] = 0;
 580               while (op->comment[0] && isspace (op->comment[0]))
 581                 op->comment++;
 582               op->lineno = lineno;
 583               op->nlines = 0;
 584               op->lines = 0;
 585               op->last_ind = 0;
 586               op->semantics_label = 0;
 587               op->nvaries = 0;
 588               op->vary = 0;
 589
 590               i = 0;
 591               for (lp = line + 4; *lp; lp++)
 592                 {
 593                   bit = 7 - (i & 7);
 594                   byte = i >> 3;
 595
 596                   if (strncmp (lp, "*/", 2) == 0)
 597                     break;
 598                   else if ((lp[0] == ' ' && lp[1] == ' ') || (lp[0] == '\t'))
 599                     break;
 600                   else if (*lp == ' ')
 601                     var_start = 1;
 602                   else
 603                     {
 604                       if (*lp == '0' || *lp == '1')
 605                         {
 606                           op->b[byte].decodable_mask |= 1 << bit;
 607                           var_start = 1;
 608                           if (op->dbytes < byte + 1)
 609                             op->dbytes = byte + 1;
 610                         }
 611                       else if (var_start)
 612                         {
 613                           op->var_start[i] = 1;
 614                           var_start = 0;
 615                         }
 616                       if (*lp == '1')
 617                         op->b[byte].decodable_bits |= 1 << bit;
 618
 619                       op->nbytes = byte + 1;
 620                       op->id[i++] = *lp;
 621                     }
 622                 }
 623             }
 624         }
 625       else
 626         {
 627           op->nlines++;
 628           if (op->lines)
 629             op->lines =
 630               (char **) realloc (op->lines, op->nlines * sizeof (char *));
 631           else
 632             op->lines = (char **) malloc (op->nlines * sizeof (char *));
 633           op->lines[op->nlines - 1] = strdup (line);
 634         }
 635     }
 636
 637   {
 638     int i, j;
 639     for (i = 0; i < n_varies; i++)
 640       {
 641         Vary *v = vary[i];
 642         lprintf (sim_log, "V[%s] %d\n", v->name, v->nlen);
 643         for (j = 0; j < v->n_patterns; j++)
 644           lprintf (sim_log, "  P %02x\n", v->patterns[j]);
 645       }
 646   }
 647
 648   for (i = n_opcodes - 2; i >= 0; i--)
 649     {
 650       if (opcodes[i]->nlines == 0)
 651         {
 652           opcodes[i]->nlines = opcodes[i + 1]->nlines;
 653           opcodes[i]->lines = opcodes[i + 1]->lines;
 654         }
 655     }
 656
 657   for (i = 0; i < 256; i++)
 658     indirect[i].type = T_unused;
 659
 660   qsort (opcodes, n_opcodes, sizeof (opcodes[0]), op_cmp);
 661
 662   vlist = (VaryRef *) malloc (n_varies * sizeof (VaryRef));
 663
 664   for (i = 0; i < n_opcodes; i++)
 665     {
 666       int j, b, v;
 667
 668       for (j = 0; j < opcodes[i]->nbytes; j++)
 669         lprintf (sim_log, "%s ",
 670                  prmb (opcodes[i]->b[j].decodable_mask,
 671                        opcodes[i]->b[j].decodable_bits));
 672       lprintf (sim_log, " %s\n", opcodes[i]->comment);
 673
 674       for (j = 0; j < opcodes[i]->nbytes; j++)
 675         {
 676           for (b = 0; b < 8; b++)
 677             if (isalpha (opcodes[i]->id[j * 8 + b]))
 678               for (v = 0; v < n_varies; v++)
 679                 if (fieldcmp (opcodes[i], j * 8 + b, vary[v]->name))
 680                   {
 681                     int nv = opcodes[i]->nvaries++;
 682                     if (nv)
 683                       opcodes[i]->vary =
 684                         (VaryRef *) realloc (opcodes[i]->vary,
 685                                              (nv + 1) * sizeof (VaryRef));
 686                     else
 687                       opcodes[i]->vary =
 688                         (VaryRef *) malloc ((nv + 1) * sizeof (VaryRef));
 689
 690                     opcodes[i]->vary[nv].varyno = v;
 691                     opcodes[i]->vary[nv].byte = j;
 692                     opcodes[i]->vary[nv].shift = 8 - b - vary[v]->nlen;
 693                     lprintf (sim_log, "[vary %s shift %d]\n",
 694                              vary[v]->name, opcodes[i]->vary[nv].shift);
 695                   }
 696
 697         }
 698     }
 699
 700   for (i = 0; i < n_opcodes; i++)
 701     {
 702       int i2;
 703       int bytes = opcodes[i]->dbytes;
 704
 705       lprintf (sim_log, "\nmask:");
 706       for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
 707         lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_mask);
 708       lprintf (sim_log, "%*s%s\n", 13 - 3 * opcodes[i]->nbytes, "",
 709                opcodes[i]->comment);
 710
 711       lprintf (sim_log, "bits:");
 712       for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
 713         lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_bits);
 714       lprintf (sim_log, "%*s(%s) %d byte%s\n", 13 - 3 * opcodes[i]->nbytes,
 715                "", opcodes[i]->id, bytes, bytes == 1 ? "" : "s");
 716
 717       store_opcode_bits (opcodes[i], 0, indirect);
 718     }
 719
 720   dump_lines (&prefix_text, 0, 0);
 721
 722   emit_indirect (indirect, 0);
 723
 724   dump_lines (&suffix_text, 0, 0);
 725
 726   if (sim_log)
 727     log_indirect (indirect, 0);
 728
 729   return errors;
 730 }