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