sim/arm/wrapper.c

   1 /* run front end support for arm
   2    Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc.
   3
   4 This file is part of ARM SIM.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* This file provides the interface between the simulator and run.c and gdb
  21    (when the simulator is linked with gdb).
  22    All simulator interaction should go through this file.  */
  23
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26 #include <string.h>
  27 #include <bfd.h>
  28 #include <signal.h>
  29 #include "callback.h"
  30 #include "remote-sim.h"
  31 #include "armdefs.h"
  32 #include "armemu.h"
  33 #include "dbg_rdi.h"
  34 #include "ansidecl.h"
  35
  36 host_callback *sim_callback;
  37
  38 static struct ARMul_State *state;
  39
  40 /* Who is using the simulator.  */
  41 static SIM_OPEN_KIND sim_kind;
  42
  43 /* argv[0] */
  44 static char *myname;
  45
  46 /* Memory size in bytes.  */
  47 static int mem_size = (1 << 21);
  48
  49 /* Non-zero to display start up banner, and maybe other things.  */
  50 static int verbosity;
  51
  52 /* Non-zero to set big endian mode.  */
  53 static int big_endian;
  54
  55 int stop_simulator;
  56
  57 static void
  58 init ()
  59 {
  60   static int done;
  61
  62   if (!done)
  63     {
  64       ARMul_EmulateInit ();
  65       state = ARMul_NewState ();
  66       state->bigendSig = (big_endian ? HIGH : LOW);
  67       ARMul_MemoryInit (state, mem_size);
  68       ARMul_OSInit (state);
  69       ARMul_CoProInit (state);
  70       state->verbose = verbosity;
  71       done = 1;
  72     }
  73 }
  74
  75 /* Set verbosity level of simulator.
  76    This is not intended to produce detailed tracing or debugging information.
  77    Just summaries.  */
  78 /* FIXME: common/run.c doesn't do this yet.  */
  79
  80 void
  81 sim_set_verbose (v)
  82      int v;
  83 {
  84   verbosity = v;
  85 }
  86
  87 /* Set the memory size to SIZE bytes.
  88    Must be called before initializing simulator.  */
  89 /* FIXME: Rename to sim_set_mem_size.  */
  90
  91 void
  92 sim_size (size)
  93      int size;
  94 {
  95   mem_size = size;
  96 }
  97
  98 void
  99 ARMul_ConsolePrint (ARMul_State * state, const char *format, ...)
 100 {
 101   va_list ap;
 102
 103   if (state->verbose)
 104     {
 105       va_start (ap, format);
 106       vprintf (format, ap);
 107       va_end (ap);
 108     }
 109 }
 110
 111 ARMword
 112 ARMul_Debug (ARMul_State * state ATTRIBUTE_UNUSED, ARMword pc ATTRIBUTE_UNUSED, ARMword instr ATTRIBUTE_UNUSED)
 113 {
 114   return 0;
 115 }
 116
 117 int
 118 sim_write (sd, addr, buffer, size)
 119      SIM_DESC sd ATTRIBUTE_UNUSED;
 120      SIM_ADDR addr;
 121      unsigned char *buffer;
 122      int size;
 123 {
 124   int i;
 125   init ();
 126   for (i = 0; i < size; i++)
 127     {
 128       ARMul_WriteByte (state, addr + i, buffer[i]);
 129     }
 130   return size;
 131 }
 132
 133 int
 134 sim_read (sd, addr, buffer, size)
 135      SIM_DESC sd ATTRIBUTE_UNUSED;
 136      SIM_ADDR addr;
 137      unsigned char *buffer;
 138      int size;
 139 {
 140   int i;
 141   init ();
 142   for (i = 0; i < size; i++)
 143     {
 144       buffer[i] = ARMul_ReadByte (state, addr + i);
 145     }
 146   return size;
 147 }
 148
 149 int
 150 sim_trace (sd)
 151      SIM_DESC sd ATTRIBUTE_UNUSED;
 152 {
 153   (*sim_callback->printf_filtered) (sim_callback,
 154                                     "This simulator does not support tracing\n");
 155   return 1;
 156 }
 157
 158 int
 159 sim_stop (sd)
 160      SIM_DESC sd ATTRIBUTE_UNUSED;
 161 {
 162   state->Emulate = STOP;
 163   stop_simulator = 1;
 164   return 1;
 165 }
 166
 167 void
 168 sim_resume (sd, step, siggnal)
 169      SIM_DESC sd ATTRIBUTE_UNUSED;
 170      int step;
 171      int siggnal ATTRIBUTE_UNUSED;
 172 {
 173   state->EndCondition = 0;
 174   stop_simulator = 0;
 175
 176   if (step)
 177     {
 178       state->Reg[15] = ARMul_DoInstr (state);
 179       if (state->EndCondition == 0)
 180         state->EndCondition = RDIError_BreakpointReached;
 181     }
 182   else
 183     {
 184 #if 1                           /* JGS */
 185       state->NextInstr = RESUME;        /* treat as PC change */
 186 #endif
 187       state->Reg[15] = ARMul_DoProg (state);
 188     }
 189
 190   FLUSHPIPE;
 191 }
 192
 193 SIM_RC
 194 sim_create_inferior (sd, abfd, argv, env)
 195      SIM_DESC sd ATTRIBUTE_UNUSED;
 196      struct _bfd *abfd;
 197      char **argv;
 198      char **env;
 199 {
 200   int argvlen = 0;
 201   int mach;
 202   char **arg;
 203
 204   if (abfd != NULL)
 205     ARMul_SetPC (state, bfd_get_start_address (abfd));
 206   else
 207     ARMul_SetPC (state, 0);     /* ??? */
 208
 209   mach = bfd_get_mach (abfd);
 210
 211   switch (mach) {
 212   default:
 213     (*sim_callback->printf_filtered) (sim_callback,
 214                                       "Unknown machine type; please update sim_create_inferior.\n");
 215     /* fall through */
 216
 217   case 0: /* arm */
 218     /* We wouldn't set the machine type with earlier toolchains, so we
 219        explicitly select a processor capable of supporting all ARM
 220        32bit mode. */
 221     /* fall through */
 222
 223   case 5: /* armv4 */
 224   case 6: /* armv4t */
 225   case 7: /* armv5 */
 226   case 8: /* armv5t */
 227     ARMul_SelectProcessor (state, STRONGARM);
 228     /* Reset mode to ARM.  A gdb user may rerun a program that had entered
 229        THUMB mode from the start and cause the ARM-mode startup code to be
 230        executed in THUMB mode. */
 231     ARMul_SetCPSR (state, USER32MODE);
 232     break;
 233
 234   case 3: /* armv3 */
 235   case 4: /* armv3m */
 236     ARMul_SelectProcessor (state, ARM600);
 237     break;
 238
 239   case 1: /* armv2 */
 240   case 2: /* armv2a */
 241     ARMul_SelectProcessor (state, ARM2);
 242     break;
 243   }
 244
 245   if (argv != NULL)
 246     {
 247       /*
 248          ** Set up the command line (by laboriously stringing together the
 249          ** environment carefully picked apart by our caller...)
 250        */
 251       /* Free any old stuff */
 252       if (state->CommandLine != NULL)
 253         {
 254           free (state->CommandLine);
 255           state->CommandLine = NULL;
 256         }
 257
 258       /* See how much we need */
 259       for (arg = argv; *arg != NULL; arg++)
 260         argvlen += strlen (*arg) + 1;
 261
 262       /* allocate it... */
 263       state->CommandLine = malloc (argvlen + 1);
 264       if (state->CommandLine != NULL)
 265         {
 266           arg = argv;
 267           state->CommandLine[0] = '\0';
 268           for (arg = argv; *arg != NULL; arg++)
 269             {
 270               strcat (state->CommandLine, *arg);
 271               strcat (state->CommandLine, " ");
 272             }
 273         }
 274     }
 275
 276   if (env != NULL)
 277     {
 278       /* Now see if there's a MEMSIZE spec in the environment */
 279       while (*env)
 280         {
 281           if (strncmp (*env, "MEMSIZE=", sizeof ("MEMSIZE=") - 1) == 0)
 282             {
 283               char *end_of_num;
 284
 285               /* Set up memory limit */
 286               state->MemSize =
 287                 strtoul (*env + sizeof ("MEMSIZE=") - 1, &end_of_num, 0);
 288             }
 289           env++;
 290         }
 291     }
 292
 293   return SIM_RC_OK;
 294 }
 295
 296 void
 297 sim_info (sd, verbose)
 298      SIM_DESC sd ATTRIBUTE_UNUSED;
 299      int verbose ATTRIBUTE_UNUSED;
 300 {
 301 }
 302
 303
 304 static int
 305 frommem (state, memory)
 306      struct ARMul_State *state;
 307      unsigned char *memory;
 308 {
 309   if (state->bigendSig == HIGH)
 310     {
 311       return (memory[0] << 24)
 312         | (memory[1] << 16) | (memory[2] << 8) | (memory[3] << 0);
 313     }
 314   else
 315     {
 316       return (memory[3] << 24)
 317         | (memory[2] << 16) | (memory[1] << 8) | (memory[0] << 0);
 318     }
 319 }
 320
 321
 322 static void
 323 tomem (state, memory, val)
 324      struct ARMul_State *state;
 325      unsigned char *memory;
 326      int val;
 327 {
 328   if (state->bigendSig == HIGH)
 329     {
 330       memory[0] = val >> 24;
 331       memory[1] = val >> 16;
 332       memory[2] = val >> 8;
 333       memory[3] = val >> 0;
 334     }
 335   else
 336     {
 337       memory[3] = val >> 24;
 338       memory[2] = val >> 16;
 339       memory[1] = val >> 8;
 340       memory[0] = val >> 0;
 341     }
 342 }
 343
 344 int
 345 sim_store_register (sd, rn, memory, length)
 346      SIM_DESC sd ATTRIBUTE_UNUSED;
 347      int rn;
 348      unsigned char *memory;
 349      int length ATTRIBUTE_UNUSED;
 350 {
 351   init ();
 352   if (rn == 25)
 353     {
 354       state->Cpsr = frommem (state, memory);
 355       ARMul_CPSRAltered (state);
 356     }
 357   else
 358     ARMul_SetReg (state, state->Mode, rn, frommem (state, memory));
 359   return -1;
 360 }
 361
 362 int
 363 sim_fetch_register (sd, rn, memory, length)
 364      SIM_DESC sd ATTRIBUTE_UNUSED;
 365      int rn;
 366      unsigned char *memory;
 367      int length ATTRIBUTE_UNUSED;
 368 {
 369   ARMword regval;
 370
 371   init ();
 372   if (rn < 16)
 373     regval = ARMul_GetReg (state, state->Mode, rn);
 374   else if (rn == 25)            /* FIXME: use PS_REGNUM from gdb/config/arm/tm-arm.h */
 375     regval = ARMul_GetCPSR (state);
 376   else
 377     regval = 0;                 /* FIXME: should report an error */
 378   tomem (state, memory, regval);
 379   return -1;
 380 }
 381
 382 SIM_DESC
 383 sim_open (kind, ptr, abfd, argv)
 384      SIM_OPEN_KIND kind;
 385      host_callback *ptr;
 386      struct _bfd *abfd;
 387      char **argv;
 388 {
 389   sim_kind = kind;
 390   if (myname) free (myname);
 391   myname = (char *) xstrdup (argv[0]);
 392   sim_callback = ptr;
 393
 394   /* Decide upon the endian-ness of the processor.
 395      If we can, get the information from the bfd itself.
 396      Otherwise look to see if we have been given a command
 397      line switch that tells us.  Otherwise default to little endian.  */
 398   if (abfd != NULL)
 399     big_endian = bfd_big_endian (abfd);
 400   else if (argv[1] != NULL)
 401     {
 402       int i;
 403
 404       /* Scan for endian-ness switch.  */
 405       for (i = 0; (argv[i] != NULL) && (argv[i][0] != 0); i++)
 406         if (argv[i][0] == '-' && argv[i][1] == 'E')
 407           {
 408             char c;
 409
 410             if ((c = argv[i][2]) == 0)
 411               {
 412                 ++i;
 413                 c = argv[i][0];
 414               }
 415
 416             switch (c)
 417               {
 418               case 0:
 419                 sim_callback->printf_filtered
 420                   (sim_callback, "No argument to -E option provided\n");
 421                 break;
 422
 423               case 'b':
 424               case 'B':
 425                 big_endian = 1;
 426                 break;
 427
 428               case 'l':
 429               case 'L':
 430                 big_endian = 0;
 431                 break;
 432
 433               default:
 434                 sim_callback->printf_filtered
 435                   (sim_callback, "Unrecognised argument to -E option\n");
 436                 break;
 437               }
 438           }
 439     }
 440
 441   return (SIM_DESC) 1;
 442 }
 443
 444 void
 445 sim_close (sd, quitting)
 446      SIM_DESC sd ATTRIBUTE_UNUSED;
 447      int quitting ATTRIBUTE_UNUSED;
 448 {
 449   if (myname) free (myname);
 450   myname = NULL;
 451 }
 452
 453 SIM_RC
 454 sim_load (sd, prog, abfd, from_tty)
 455      SIM_DESC sd;
 456      char *prog;
 457      bfd *abfd;
 458      int from_tty ATTRIBUTE_UNUSED;
 459 {
 460   extern bfd *sim_load_file (); /* ??? Don't know where this should live.  */
 461   bfd *prog_bfd;
 462
 463   prog_bfd = sim_load_file (sd, myname, sim_callback, prog, abfd,
 464                             sim_kind == SIM_OPEN_DEBUG, 0, sim_write);
 465   if (prog_bfd == NULL)
 466     return SIM_RC_FAIL;
 467   ARMul_SetPC (state, bfd_get_start_address (prog_bfd));
 468   if (abfd == NULL)
 469     bfd_close (prog_bfd);
 470   return SIM_RC_OK;
 471 }
 472
 473 void
 474 sim_stop_reason (sd, reason, sigrc)
 475      SIM_DESC sd ATTRIBUTE_UNUSED;
 476      enum sim_stop *reason;
 477      int *sigrc;
 478 {
 479   if (stop_simulator)
 480     {
 481       *reason = sim_stopped;
 482       *sigrc = SIGINT;
 483     }
 484   else if (state->EndCondition == 0)
 485     {
 486       *reason = sim_exited;
 487       *sigrc = state->Reg[0] & 255;
 488     }
 489   else
 490     {
 491       *reason = sim_stopped;
 492       if (state->EndCondition == RDIError_BreakpointReached)
 493         *sigrc = SIGTRAP;
 494       else
 495         *sigrc = 0;
 496     }
 497 }
 498
 499 void
 500 sim_do_command (sd, cmd)
 501      SIM_DESC sd ATTRIBUTE_UNUSED;
 502      char *cmd ATTRIBUTE_UNUSED;
 503 {
 504   (*sim_callback->printf_filtered) (sim_callback,
 505                                     "This simulator does not accept any commands.\n");
 506 }
 507
 508
 509 void
 510 sim_set_callbacks (ptr)
 511      host_callback *ptr;
 512 {
 513   sim_callback = ptr;
 514 }