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 #if 1                           /* JGS */
 209   /* We explicitly select a processor capable of supporting the ARM
 210      32bit mode, and then we force the simulated CPU into the 32bit
 211      User mode: */
 212   ARMul_SelectProcessor (state, ARM600);
 213   ARMul_SetCPSR (state, USER32MODE);
 214 #endif
 215
 216   if (argv != NULL)
 217     {
 218       /*
 219          ** Set up the command line (by laboriously stringing together the
 220          ** environment carefully picked apart by our caller...)
 221        */
 222       /* Free any old stuff */
 223       if (state->CommandLine != NULL)
 224         {
 225           free (state->CommandLine);
 226           state->CommandLine = NULL;
 227         }
 228
 229       /* See how much we need */
 230       for (arg = argv; *arg != NULL; arg++)
 231         argvlen += strlen (*arg) + 1;
 232
 233       /* allocate it... */
 234       state->CommandLine = malloc (argvlen + 1);
 235       if (state->CommandLine != NULL)
 236         {
 237           arg = argv;
 238           state->CommandLine[0] = '\0';
 239           for (arg = argv; *arg != NULL; arg++)
 240             {
 241               strcat (state->CommandLine, *arg);
 242               strcat (state->CommandLine, " ");
 243             }
 244         }
 245     }
 246
 247   if (env != NULL)
 248     {
 249       /* Now see if there's a MEMSIZE spec in the environment */
 250       while (*env)
 251         {
 252           if (strncmp (*env, "MEMSIZE=", sizeof ("MEMSIZE=") - 1) == 0)
 253             {
 254               char *end_of_num;
 255
 256               /* Set up memory limit */
 257               state->MemSize =
 258                 strtoul (*env + sizeof ("MEMSIZE=") - 1, &end_of_num, 0);
 259             }
 260           env++;
 261         }
 262     }
 263
 264   return SIM_RC_OK;
 265 }
 266
 267 void
 268 sim_info (sd, verbose)
 269      SIM_DESC sd ATTRIBUTE_UNUSED;
 270      int verbose ATTRIBUTE_UNUSED;
 271 {
 272 }
 273
 274
 275 static int
 276 frommem (state, memory)
 277      struct ARMul_State *state;
 278      unsigned char *memory;
 279 {
 280   if (state->bigendSig == HIGH)
 281     {
 282       return (memory[0] << 24)
 283         | (memory[1] << 16) | (memory[2] << 8) | (memory[3] << 0);
 284     }
 285   else
 286     {
 287       return (memory[3] << 24)
 288         | (memory[2] << 16) | (memory[1] << 8) | (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 ATTRIBUTE_UNUSED;
 318      int rn;
 319      unsigned char *memory;
 320      int length ATTRIBUTE_UNUSED;
 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 ATTRIBUTE_UNUSED;
 330      int rn;
 331      unsigned char *memory;
 332      int length ATTRIBUTE_UNUSED;
 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 ATTRIBUTE_UNUSED;
 411      int quitting ATTRIBUTE_UNUSED;
 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 ATTRIBUTE_UNUSED;
 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, 0, sim_write);
 428   if (prog_bfd == NULL)
 429     return SIM_RC_FAIL;
 430   ARMul_SetPC (state, bfd_get_start_address (prog_bfd));
 431   if (abfd == NULL)
 432     bfd_close (prog_bfd);
 433   return SIM_RC_OK;
 434 }
 435
 436 void
 437 sim_stop_reason (sd, reason, sigrc)
 438      SIM_DESC sd ATTRIBUTE_UNUSED;
 439      enum sim_stop *reason;
 440      int *sigrc;
 441 {
 442   if (stop_simulator)
 443     {
 444       *reason = sim_stopped;
 445       *sigrc = SIGINT;
 446     }
 447   else if (state->EndCondition == 0)
 448     {
 449       *reason = sim_exited;
 450       *sigrc = state->Reg[0] & 255;
 451     }
 452   else
 453     {
 454       *reason = sim_stopped;
 455       if (state->EndCondition == RDIError_BreakpointReached)
 456         *sigrc = SIGTRAP;
 457       else
 458         *sigrc = 0;
 459     }
 460 }
 461
 462 void
 463 sim_do_command (sd, cmd)
 464      SIM_DESC sd ATTRIBUTE_UNUSED;
 465      char *cmd ATTRIBUTE_UNUSED;
 466 {
 467   (*sim_callback->printf_filtered) (sim_callback,
 468                                     "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 }