sim/arm/wrapper.c

   1 /* run front end support for arm
   2    Copyright (C) 1995, 1996, 1997 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   char **arg;
 202
 203   if (abfd != NULL)
 204     ARMul_SetPC (state, bfd_get_start_address (abfd));
 205   else
 206     ARMul_SetPC (state, 0);     /* ??? */
 207
 208   /* We explicitly select a processor capable of supporting the ARM
 209      32bit mode.  JGS  */
 210   ARMul_SelectProcessor (state, ARM600);
 211   /* And then we force the simulated CPU into the 32bit User mode.  */
 212   ARMul_SetCPSR (state, USER32MODE);
 213
 214   if (argv != NULL)
 215     {
 216       /*
 217          ** Set up the command line (by laboriously stringing together the
 218          ** environment carefully picked apart by our caller...)
 219        */
 220       /* Free any old stuff */
 221       if (state->CommandLine != NULL)
 222         {
 223           free (state->CommandLine);
 224           state->CommandLine = NULL;
 225         }
 226
 227       /* See how much we need */
 228       for (arg = argv; *arg != NULL; arg++)
 229         argvlen += strlen (*arg) + 1;
 230
 231       /* allocate it... */
 232       state->CommandLine = malloc (argvlen + 1);
 233       if (state->CommandLine != NULL)
 234         {
 235           arg = argv;
 236           state->CommandLine[0] = '\0';
 237           for (arg = argv; *arg != NULL; arg++)
 238             {
 239               strcat (state->CommandLine, *arg);
 240               strcat (state->CommandLine, " ");
 241             }
 242         }
 243     }
 244
 245   if (env != NULL)
 246     {
 247       /* Now see if there's a MEMSIZE spec in the environment */
 248       while (*env)
 249         {
 250           if (strncmp (*env, "MEMSIZE=", sizeof ("MEMSIZE=") - 1) == 0)
 251             {
 252               char *end_of_num;
 253
 254               /* Set up memory limit */
 255               state->MemSize =
 256                 strtoul (*env + sizeof ("MEMSIZE=") - 1, &end_of_num, 0);
 257             }
 258           env++;
 259         }
 260     }
 261
 262   return SIM_RC_OK;
 263 }
 264
 265 void
 266 sim_info (sd, verbose)
 267      SIM_DESC sd ATTRIBUTE_UNUSED;
 268      int verbose ATTRIBUTE_UNUSED;
 269 {
 270 }
 271
 272
 273 static int
 274 frommem (state, memory)
 275      struct ARMul_State *state;
 276      unsigned char *memory;
 277 {
 278   if (state->bigendSig == HIGH)
 279     {
 280       return (memory[0] << 24)
 281         | (memory[1] << 16) | (memory[2] << 8) | (memory[3] << 0);
 282     }
 283   else
 284     {
 285       return (memory[3] << 24)
 286         | (memory[2] << 16) | (memory[1] << 8) | (memory[0] << 0);
 287     }
 288 }
 289
 290
 291 static void
 292 tomem (state, memory, val)
 293      struct ARMul_State *state;
 294      unsigned char *memory;
 295      int val;
 296 {
 297   if (state->bigendSig == HIGH)
 298     {
 299       memory[0] = val >> 24;
 300       memory[1] = val >> 16;
 301       memory[2] = val >> 8;
 302       memory[3] = val >> 0;
 303     }
 304   else
 305     {
 306       memory[3] = val >> 24;
 307       memory[2] = val >> 16;
 308       memory[1] = val >> 8;
 309       memory[0] = val >> 0;
 310     }
 311 }
 312
 313 int
 314 sim_store_register (sd, rn, memory, length)
 315      SIM_DESC sd ATTRIBUTE_UNUSED;
 316      int rn;
 317      unsigned char *memory;
 318      int length ATTRIBUTE_UNUSED;
 319 {
 320   init ();
 321   if (rn == 25)
 322     {
 323       state->Cpsr = frommem (state, memory);
 324       ARMul_CPSRAltered (state);
 325     }
 326   else
 327     ARMul_SetReg (state, state->Mode, rn, frommem (state, memory));
 328   return -1;
 329 }
 330
 331 int
 332 sim_fetch_register (sd, rn, memory, length)
 333      SIM_DESC sd ATTRIBUTE_UNUSED;
 334      int rn;
 335      unsigned char *memory;
 336      int length ATTRIBUTE_UNUSED;
 337 {
 338   ARMword regval;
 339
 340   init ();
 341   if (rn < 16)
 342     regval = ARMul_GetReg (state, state->Mode, rn);
 343   else if (rn == 25)            /* FIXME: use PS_REGNUM from gdb/config/arm/tm-arm.h */
 344     regval = ARMul_GetCPSR (state);
 345   else
 346     regval = 0;                 /* FIXME: should report an error */
 347   tomem (state, memory, regval);
 348   return -1;
 349 }
 350
 351 SIM_DESC
 352 sim_open (kind, ptr, abfd, argv)
 353      SIM_OPEN_KIND kind;
 354      host_callback *ptr;
 355      struct _bfd *abfd;
 356      char **argv;
 357 {
 358   sim_kind = kind;
 359   if (myname) free (myname);
 360   myname = (char *) xstrdup (argv[0]);
 361   sim_callback = ptr;
 362
 363   /* Decide upon the endian-ness of the processor.
 364      If we can, get the information from the bfd itself.
 365      Otherwise look to see if we have been given a command
 366      line switch that tells us.  Otherwise default to little endian.  */
 367   if (abfd != NULL)
 368     big_endian = bfd_big_endian (abfd);
 369   else if (argv[1] != NULL)
 370     {
 371       int i;
 372
 373       /* Scan for endian-ness switch.  */
 374       for (i = 0; (argv[i] != NULL) && (argv[i][0] != 0); i++)
 375         if (argv[i][0] == '-' && argv[i][1] == 'E')
 376           {
 377             char c;
 378
 379             if ((c = argv[i][2]) == 0)
 380               {
 381                 ++i;
 382                 c = argv[i][0];
 383               }
 384
 385             switch (c)
 386               {
 387               case 0:
 388                 sim_callback->printf_filtered
 389                   (sim_callback, "No argument to -E option provided\n");
 390                 break;
 391
 392               case 'b':
 393               case 'B':
 394                 big_endian = 1;
 395                 break;
 396
 397               case 'l':
 398               case 'L':
 399                 big_endian = 0;
 400                 break;
 401
 402               default:
 403                 sim_callback->printf_filtered
 404                   (sim_callback, "Unrecognised argument to -E option\n");
 405                 break;
 406               }
 407           }
 408     }
 409
 410   return (SIM_DESC) 1;
 411 }
 412
 413 void
 414 sim_close (sd, quitting)
 415      SIM_DESC sd ATTRIBUTE_UNUSED;
 416      int quitting ATTRIBUTE_UNUSED;
 417 {
 418   if (myname) free (myname);
 419   myname = NULL;
 420 }
 421
 422 SIM_RC
 423 sim_load (sd, prog, abfd, from_tty)
 424      SIM_DESC sd;
 425      char *prog;
 426      bfd *abfd;
 427      int from_tty ATTRIBUTE_UNUSED;
 428 {
 429   extern bfd *sim_load_file (); /* ??? Don't know where this should live.  */
 430   bfd *prog_bfd;
 431
 432   prog_bfd = sim_load_file (sd, myname, sim_callback, prog, abfd,
 433                             sim_kind == SIM_OPEN_DEBUG, 0, sim_write);
 434   if (prog_bfd == NULL)
 435     return SIM_RC_FAIL;
 436   ARMul_SetPC (state, bfd_get_start_address (prog_bfd));
 437   if (abfd == NULL)
 438     bfd_close (prog_bfd);
 439   return SIM_RC_OK;
 440 }
 441
 442 void
 443 sim_stop_reason (sd, reason, sigrc)
 444      SIM_DESC sd ATTRIBUTE_UNUSED;
 445      enum sim_stop *reason;
 446      int *sigrc;
 447 {
 448   if (stop_simulator)
 449     {
 450       *reason = sim_stopped;
 451       *sigrc = SIGINT;
 452     }
 453   else if (state->EndCondition == 0)
 454     {
 455       *reason = sim_exited;
 456       *sigrc = state->Reg[0] & 255;
 457     }
 458   else
 459     {
 460       *reason = sim_stopped;
 461       if (state->EndCondition == RDIError_BreakpointReached)
 462         *sigrc = SIGTRAP;
 463       else
 464         *sigrc = 0;
 465     }
 466 }
 467
 468 void
 469 sim_do_command (sd, cmd)
 470      SIM_DESC sd ATTRIBUTE_UNUSED;
 471      char *cmd ATTRIBUTE_UNUSED;
 472 {
 473   (*sim_callback->printf_filtered) (sim_callback,
 474                                     "This simulator does not accept any commands.\n");
 475 }
 476
 477
 478 void
 479 sim_set_callbacks (ptr)
 480      host_callback *ptr;
 481 {
 482   sim_callback = ptr;
 483 }