sim/arm/parent.c

   1 /*  parent.c -- ARMulator RDP comms code:  ARM6 Instruction Emulator.
   2     Copyright (C) 1994 Advanced RISC Machines Ltd.
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  17
  18 /*****************************************************************/
  19 /* The Parent process continues here...                          */
  20 /* It waits on the socket and passes on RDP messages down a pipe */
  21 /* to the ARMulator RDP to RDI interpreter.                      */
  22 /*****************************************************************/
  23
  24 #include <stdio.h>
  25 #include <sys/types.h>
  26 #include <signal.h>
  27 #include "time.h"
  28 #include "armdefs.h"
  29 #include "dbg_rdi.h"
  30 #include "communicate.h"
  31
  32 /* The socket to the debugger */
  33 extern int debugsock;
  34
  35 /* The pipes between the two processes */
  36 extern int mumkid[2];
  37 extern int kidmum[2];
  38
  39 /* A pipe for handling SWI return values that goes straight from the */
  40 /* parent to the ARMulator host interface, bypassing the child's RDP */
  41 /* to RDI interpreter */
  42 extern int DebuggerARMul[2];
  43
  44 /* The maximum number of file descriptors */
  45 extern int nfds;
  46
  47 /* The child process id. */
  48 extern pid_t child;
  49
  50 void
  51 parent ()
  52 {
  53   int i, j, k;
  54   unsigned char message, CPnum, exreturn;
  55   ARMword mask, nbytes, messagetype;
  56   unsigned char c, d;
  57   ARMword x, y;
  58   int virgin = 1;
  59   struct fd_set readfds;
  60
  61 #ifdef DEBUG
  62   fprintf (stderr, "parent ()...\n");
  63 #endif
  64
  65 panic_error:
  66
  67   if (!virgin)
  68     {
  69 #ifdef DEBUG
  70       fprintf (stderr, "Arghh! What is going on?\n");
  71 #endif
  72       kill (child, SIGHUP);
  73       MYwrite_char (debugsock, RDP_Reset);
  74     }
  75
  76   virgin = 0;
  77
  78   while (1)
  79     {
  80
  81       /* Wait either for the ARMulator or the debugger */
  82
  83       FD_ZERO (&readfds);
  84       FD_SET (kidmum[0], &readfds);     /* Wait for messages from ARMulator */
  85       FD_SET (debugsock, &readfds);     /* Wait for messages from debugger */
  86
  87 #ifdef DEBUG
  88       fprintf (stderr, "Waiting for ARMulator or debugger... ");
  89 #endif
  90
  91       while ((i = select (nfds, &readfds, (fd_set *) 0, (fd_set *) 0, 0)) < 0)
  92         {
  93           perror ("select");
  94         }
  95
  96 #ifdef DEBUG
  97       fprintf (stderr, "(%d/2)", i);
  98 #endif
  99
 100       if (FD_ISSET (debugsock, &readfds))
 101         {
 102 #ifdef DEBUG
 103           fprintf (stderr, "->debugger\n");
 104 #endif
 105
 106           /* Inside this rather large if statement with simply pass on a complete
 107              message to the ARMulator.  The reason we need to pass messages on one
 108              at a time is that we have to know whether the message is an OSOpReply
 109              or an info(stop), so that we can take different action in those
 110              cases. */
 111
 112           if (MYread_char (debugsock, &message))
 113             goto panic_error;
 114
 115           switch (message)
 116             {
 117             case RDP_Start:
 118               /* Open and/or Initialise */
 119 #ifdef DEBUG
 120               fprintf (stderr, "RDP Open\n");
 121 #endif
 122               if (MYread_char (debugsock, &c))  /* type */
 123                 goto panic_error;
 124
 125               if (MYread_word (debugsock, &x))  /* memory size */
 126                 goto panic_error;
 127
 128               MYwrite_char (mumkid[1], message);
 129               MYwrite_char (mumkid[1], c);
 130               MYwrite_word (mumkid[1], x);
 131               if (c & 0x2)
 132                 {
 133                   passon (debugsock, mumkid[1], 1);     /* speed */
 134                 }
 135               break;
 136
 137             case RDP_End:
 138               /* Close and Finalise */
 139 #ifdef DEBUG
 140               fprintf (stderr, "RDP Close\n");
 141 #endif
 142               MYwrite_char (mumkid[1], message);
 143               break;
 144
 145             case RDP_Read:
 146               /* Read Memory Address */
 147 #ifdef DEBUG
 148               fprintf (stderr, "RDP Read Memory\n");
 149 #endif
 150               MYwrite_char (mumkid[1], message);
 151               if (passon (debugsock, mumkid[1], 4))
 152                 goto panic_error;       /* address */
 153               if (MYread_word (debugsock, &nbytes))
 154                 goto panic_error;       /* nbytes */
 155               MYwrite_word (mumkid[1], nbytes);
 156               break;
 157
 158             case RDP_Write:
 159               /* Write Memory Address */
 160 #ifdef DEBUG
 161               fprintf (stderr, "RDP Write Memory\n");
 162 #endif
 163               if (MYread_word (debugsock, &x))
 164                 goto panic_error;       /* address */
 165
 166               if (MYread_word (debugsock, &y))
 167                 goto panic_error;       /* nbytes */
 168
 169               MYwrite_char (mumkid[1], message);
 170               MYwrite_word (mumkid[1], x);
 171               MYwrite_word (mumkid[1], y);
 172               passon (debugsock, mumkid[1], y); /* actual data */
 173               break;
 174
 175             case RDP_CPUread:
 176               /* Read CPU State */
 177 #ifdef DEBUG
 178               fprintf (stderr, "RDP Read CPU\n");
 179 #endif
 180               if (MYread_char (debugsock, &c))
 181                 goto panic_error;       /* mode */
 182
 183               if (MYread_word (debugsock, &mask))
 184                 goto panic_error;       /* mask */
 185
 186               MYwrite_char (mumkid[1], message);
 187               MYwrite_char (mumkid[1], c);
 188               MYwrite_word (mumkid[1], mask);
 189               break;
 190
 191             case RDP_CPUwrite:
 192               /* Write CPU State */
 193 #ifdef DEBUG
 194               fprintf (stderr, "RDP Write CPU\n");
 195 #endif
 196               if (MYread_char (debugsock, &c))
 197                 goto panic_error;       /* mode */
 198
 199               if (MYread_word (debugsock, &x))
 200                 goto panic_error;       /* mask */
 201
 202               MYwrite_char (mumkid[1], message);
 203               MYwrite_char (mumkid[1], c);
 204               MYwrite_word (mumkid[1], x);
 205               for (k = 1, j = 0; k != 0x80000000; k *= 2, j++)
 206                 if ((k & x) && passon (debugsock, mumkid[1], 4))
 207                   goto panic_error;
 208               break;
 209
 210             case RDP_CPread:
 211               /* Read Co-Processor State */
 212 #ifdef DEBUG
 213               fprintf (stderr, "RDP Read CP state\n");
 214 #endif
 215               if (MYread_char (debugsock, &CPnum))
 216                 goto panic_error;
 217
 218               if (MYread_word (debugsock, &mask))
 219                 goto panic_error;
 220
 221               MYwrite_char (mumkid[1], message);
 222               MYwrite_char (mumkid[1], CPnum);
 223               MYwrite_word (mumkid[1], mask);
 224               break;
 225
 226             case RDP_CPwrite:
 227               /* Write Co-Processor State */
 228 #ifdef DEBUG
 229               fprintf (stderr, "RDP Write CP state\n");
 230 #endif
 231               if (MYread_char (debugsock, &CPnum))
 232                 goto panic_error;
 233
 234               if (MYread_word (debugsock, &mask))
 235                 goto panic_error;
 236
 237               MYwrite_char (mumkid[1], message);
 238               MYwrite_char (mumkid[1], c);
 239               MYwrite_char (mumkid[1], x);
 240               for (k = 1, j = 0; k != 0x80000000; k *= 2, j++)
 241                 if (k & x)
 242                   {
 243                     if ((c == 1 || c == 2) && k <= 128)
 244                       {
 245                         /* FP register = 12 bytes + 4 bytes format */
 246                         if (passon (debugsock, mumkid[1], 16))
 247                           goto panic_error;
 248                       }
 249                     else
 250                       {
 251                         /* Normal register = 4 bytes */
 252                         if (passon (debugsock, mumkid[1], 4))
 253                           goto panic_error;
 254                       }
 255                   }
 256               break;
 257
 258             case RDP_SetBreak:
 259               /* Set Breakpoint */
 260 #ifdef DEBUG
 261               fprintf (stderr, "RDP Set Breakpoint\n");
 262 #endif
 263               if (MYread_word (debugsock, &x))
 264                 goto panic_error;       /* address */
 265
 266               if (MYread_char (debugsock, &c))
 267                 goto panic_error;       /* type */
 268
 269               MYwrite_char (mumkid[1], message);
 270               MYwrite_word (mumkid[1], x);
 271               MYwrite_char (mumkid[1], c);
 272               if (((c & 0xf) >= 5) && passon (debugsock, mumkid[1], 4))
 273                 goto panic_error;       /* bound */
 274               break;
 275
 276             case RDP_ClearBreak:
 277               /* Clear Breakpoint */
 278 #ifdef DEBUG
 279               fprintf (stderr, "RDP Clear Breakpoint\n");
 280 #endif
 281               MYwrite_char (mumkid[1], message);
 282               if (passon (debugsock, mumkid[1], 4))
 283                 goto panic_error;       /* point */
 284               break;
 285
 286             case RDP_SetWatch:
 287               /* Set Watchpoint */
 288 #ifdef DEBUG
 289               fprintf (stderr, "RDP Set Watchpoint\n");
 290 #endif
 291               if (MYread_word (debugsock, &x))
 292                 goto panic_error;       /* address */
 293
 294               if (MYread_char (debugsock, &c))
 295                 goto panic_error;       /* type */
 296
 297               if (MYread_char (debugsock, &d))
 298                 goto panic_error;       /* datatype */
 299
 300               MYwrite_char (mumkid[1], message);
 301               MYwrite_word (mumkid[1], x);
 302               MYwrite_char (mumkid[1], c);
 303               MYwrite_char (mumkid[1], d);
 304               if (((c & 0xf) >= 5) && passon (debugsock, mumkid[1], 4))
 305                 goto panic_error;       /* bound */
 306               break;
 307
 308             case RDP_ClearWatch:
 309               /* Clear Watchpoint */
 310 #ifdef DEBUG
 311               fprintf (stderr, "RDP Clear Watchpoint\n");
 312 #endif
 313               MYwrite_char (mumkid[1], message);
 314               if (passon (debugsock, mumkid[1], 4))
 315                 goto panic_error;       /* point */
 316               break;
 317
 318             case RDP_Execute:
 319               /* Excecute */
 320 #ifdef DEBUG
 321               fprintf (stderr, "RDP Execute\n");
 322 #endif
 323
 324               /* LEAVE THIS ONE 'TIL LATER... */
 325               /* NEED TO WORK THINGS OUT */
 326
 327               /* NO ASCYNCHROUS RUNNING */
 328
 329               if (MYread_char (debugsock, &c))
 330                 goto panic_error;       /* return */
 331
 332               /* Remember incase bit 7 is set and we have to send back a word */
 333               exreturn = c;
 334
 335               MYwrite_char (mumkid[1], message);
 336               MYwrite_char (mumkid[1], c);
 337               break;
 338
 339             case RDP_Step:
 340               /* Step */
 341 #ifdef DEBUG
 342               fprintf (stderr, "RDP Step\n");
 343 #endif
 344
 345               if (MYread_char (debugsock, &c))
 346                 goto panic_error;       /* return */
 347
 348               if (MYread_word (debugsock, &x))
 349                 goto panic_error;       /* ninstr */
 350
 351               MYwrite_char (mumkid[1], message);
 352               MYwrite_char (mumkid[1], c);
 353               MYwrite_word (mumkid[1], x);
 354               break;
 355
 356             case RDP_Info:
 357               /* Info */
 358 #ifdef DEBUG
 359               fprintf (stderr, "RDP Info\n");
 360 #endif
 361               /* INFO TARGET, SET RDI LEVEL */
 362               if (MYread_word (debugsock, &messagetype))
 363                 goto panic_error;       /* info */
 364
 365               switch (messagetype)
 366                 {
 367                 case RDIInfo_Target:
 368                   MYwrite_char (mumkid[1], message);
 369                   MYwrite_word (mumkid[1], messagetype);
 370                   break;
 371
 372                 case RDISet_RDILevel:
 373                   MYwrite_char (mumkid[1], message);
 374                   MYwrite_word (mumkid[1], messagetype);
 375                   if (passon (debugsock, mumkid[1], 1))
 376                     goto panic_error;   /* argument */
 377                   break;
 378
 379                 case RDISet_Cmdline:
 380                   /* Got to pass on a string argument */
 381                   MYwrite_char (mumkid[1], message);
 382                   MYwrite_word (mumkid[1], messagetype);
 383                   do
 384                     {
 385                       if (MYread_char (debugsock, &c))
 386                         goto panic_error;
 387
 388                       MYwrite_char (mumkid[1], c);
 389                     }
 390                   while (c);
 391                   break;
 392
 393                 case RDISignal_Stop:
 394                   kill (child, SIGUSR1);
 395                   MYwrite_char (debugsock, RDP_Return);
 396                   MYwrite_char (debugsock, RDIError_UserInterrupt);
 397                   break;
 398
 399                 case RDIVector_Catch:
 400                   MYread_word (debugsock, &x);
 401                   MYwrite_char (mumkid[1], message);
 402                   MYwrite_word (mumkid[1], messagetype);
 403                   MYwrite_word (mumkid[1], x);
 404                   break;
 405
 406                 case RDIInfo_Step:
 407                   MYwrite_char (mumkid[1], message);
 408                   MYwrite_word (mumkid[1], messagetype);
 409                   break;
 410
 411                 case RDIInfo_Points:
 412                   MYwrite_char (mumkid[1], message);
 413                   MYwrite_word (mumkid[1], messagetype);
 414                   break;
 415
 416                 default:
 417                   fprintf (stderr, "Unrecognized RDIInfo request %d\n",
 418                            messagetype);
 419                   goto panic_error;
 420                 }
 421               break;
 422
 423             case RDP_OSOpReply:
 424               /* OS Operation Reply */
 425 #ifdef DEBUG
 426               fprintf (stderr, "RDP OS Reply\n");
 427 #endif
 428               MYwrite_char (mumkid[1], message);
 429               if (MYread_char (debugsock, &message))
 430                 goto panic_error;
 431               MYwrite_char (mumkid[1], message);
 432               switch (message)
 433                 {
 434                 case 0: /* return value i.e. nothing else. */
 435                   break;
 436
 437                 case 1: /* returns a byte... */
 438                   if (MYread_char (debugsock, &c))
 439                     goto panic_error;
 440
 441                   MYwrite_char (mumkid[1], c);
 442                   break;
 443
 444                 case 2: /* returns a word... */
 445                   if (MYread_word (debugsock, &x))
 446                     goto panic_error;
 447
 448                   MYwrite_word (mumkid[1], x);
 449                   break;
 450                 }
 451               break;
 452
 453             case RDP_Reset:
 454               /* Reset */
 455 #ifdef DEBUG
 456               fprintf (stderr, "RDP Reset\n");
 457 #endif
 458               MYwrite_char (mumkid[1], message);
 459               break;
 460
 461             default:
 462               /* Hmm.. bad RDP operation */
 463               fprintf (stderr, "RDP Bad RDP request (%d)\n", message);
 464               MYwrite_char (debugsock, RDP_Return);
 465               MYwrite_char (debugsock, RDIError_UnimplementedMessage);
 466               break;
 467             }
 468         }
 469
 470       if (FD_ISSET (kidmum[0], &readfds))
 471         {
 472 #ifdef DEBUG
 473           fprintf (stderr, "->ARMulator\n");
 474 #endif
 475           /* Anything we get from the ARMulator has to go to the debugger... */
 476           /* It is that simple! */
 477
 478           passon (kidmum[0], debugsock, 1);
 479         }
 480     }
 481 }