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
 126   init ();
 127
 128   for (i = 0; i < size; i++)
 129     ARMul_WriteByte (state, addr + i, buffer[i]);
 130
 131   return size;
 132 }
 133
 134 int
 135 sim_read (sd, addr, buffer, size)
 136      SIM_DESC sd ATTRIBUTE_UNUSED;
 137      SIM_ADDR addr;
 138      unsigned char *buffer;
 139      int size;
 140 {
 141   int i;
 142   init ();
 143   for (i = 0; i < size; i++)
 144     {
 145       buffer[i] = ARMul_ReadByte (state, addr + i);
 146     }
 147   return size;
 148 }
 149
 150 int
 151 sim_trace (sd)
 152      SIM_DESC sd ATTRIBUTE_UNUSED;
 153 {
 154   (*sim_callback->printf_filtered) (sim_callback,
 155                                     "This simulator does not support tracing\n");
 156   return 1;
 157 }
 158
 159 int
 160 sim_stop (sd)
 161      SIM_DESC sd ATTRIBUTE_UNUSED;
 162 {
 163   state->Emulate = STOP;
 164   stop_simulator = 1;
 165   return 1;
 166 }
 167
 168 void
 169 sim_resume (sd, step, siggnal)
 170      SIM_DESC sd ATTRIBUTE_UNUSED;
 171      int step;
 172      int siggnal ATTRIBUTE_UNUSED;
 173 {
 174   state->EndCondition = 0;
 175   stop_simulator = 0;
 176
 177   if (step)
 178     {
 179       state->Reg[15] = ARMul_DoInstr (state);
 180       if (state->EndCondition == 0)
 181         state->EndCondition = RDIError_BreakpointReached;
 182     }
 183   else
 184     {
 185 #if 1                           /* JGS */
 186       state->NextInstr = RESUME;        /* treat as PC change */
 187 #endif
 188       state->Reg[15] = ARMul_DoProg (state);
 189     }
 190
 191   FLUSHPIPE;
 192 }
 193
 194 SIM_RC
 195 sim_create_inferior (sd, abfd, argv, env)
 196      SIM_DESC sd ATTRIBUTE_UNUSED;
 197      struct _bfd *abfd;
 198      char **argv;
 199      char **env;
 200 {
 201   int argvlen = 0;
 202   int mach;
 203   char **arg;
 204
 205   if (abfd != NULL)
 206     ARMul_SetPC (state, bfd_get_start_address (abfd));
 207   else
 208     ARMul_SetPC (state, 0);     /* ??? */
 209
 210   mach = bfd_get_mach (abfd);
 211
 212   switch (mach)
 213     {
 214     default:
 215       (*sim_callback->printf_filtered) (sim_callback,
 216                                         "Unknown machine type; please update sim_create_inferior.\n");
 217       /* fall through */
 218
 219     case 0: /* arm */
 220       /* We wouldn't set the machine type with earlier toolchains, so we
 221          explicitly select a processor capable of supporting all ARM
 222          32bit mode. */
 223       /* fall through */
 224
 225     case 5: /* armv4 */
 226     case 6: /* armv4t */
 227     case 7: /* armv5 */
 228     case 8: /* armv5t */
 229       if (mach == 7 || mach == 8)
 230         ARMul_SelectProcessor (state, ARM_v5_Prop);
 231       else
 232         ARMul_SelectProcessor (state, ARM_v4_Prop);
 233       /* Reset mode to ARM.  A gdb user may rerun a program that had entered
 234          THUMB mode from the start and cause the ARM-mode startup code to be
 235          executed in THUMB mode. */
 236       ARMul_SetCPSR (state, USER32MODE);
 237       break;
 238
 239     case 3: /* armv3 */
 240     case 4: /* armv3m */
 241       ARMul_SelectProcessor (state, ARM_Lock_Prop);
 242       break;
 243
 244     case 1: /* armv2 */
 245     case 2: /* armv2a */
 246       ARMul_SelectProcessor (state, ARM_Fix26_Prop);
 247       break;
 248     }
 249
 250   if (argv != NULL)
 251     {
 252       /*
 253          ** Set up the command line (by laboriously stringing together the
 254          ** environment carefully picked apart by our caller...)
 255        */
 256       /* Free any old stuff */
 257       if (state->CommandLine != NULL)
 258         {
 259           free (state->CommandLine);
 260           state->CommandLine = NULL;
 261         }
 262
 263       /* See how much we need */
 264       for (arg = argv; *arg != NULL; arg++)
 265         argvlen += strlen (*arg) + 1;
 266
 267       /* allocate it... */
 268       state->CommandLine = malloc (argvlen + 1);
 269       if (state->CommandLine != NULL)
 270         {
 271           arg = argv;
 272           state->CommandLine[0] = '\0';
 273           for (arg = argv; *arg != NULL; arg++)
 274             {
 275               strcat (state->CommandLine, *arg);
 276               strcat (state->CommandLine, " ");
 277             }
 278         }
 279     }
 280
 281   if (env != NULL)
 282     {
 283       /* Now see if there's a MEMSIZE spec in the environment */
 284       while (*env)
 285         {
 286           if (strncmp (*env, "MEMSIZE=", sizeof ("MEMSIZE=") - 1) == 0)
 287             {
 288               char *end_of_num;
 289
 290               /* Set up memory limit */
 291               state->MemSize =
 292                 strtoul (*env + sizeof ("MEMSIZE=") - 1, &end_of_num, 0);
 293             }
 294           env++;
 295         }
 296     }
 297
 298   return SIM_RC_OK;
 299 }
 300
 301 void
 302 sim_info (sd, verbose)
 303      SIM_DESC sd ATTRIBUTE_UNUSED;
 304      int verbose ATTRIBUTE_UNUSED;
 305 {
 306 }
 307
 308
 309 static int
 310 frommem (state, memory)
 311      struct ARMul_State *state;
 312      unsigned char *memory;
 313 {
 314   if (state->bigendSig == HIGH)
 315     {
 316       return (memory[0] << 24)
 317         | (memory[1] << 16) | (memory[2] << 8) | (memory[3] << 0);
 318     }
 319   else
 320     {
 321       return (memory[3] << 24)
 322         | (memory[2] << 16) | (memory[1] << 8) | (memory[0] << 0);
 323     }
 324 }
 325
 326
 327 static void
 328 tomem (state, memory, val)
 329      struct ARMul_State *state;
 330      unsigned char *memory;
 331      int val;
 332 {
 333   if (state->bigendSig == HIGH)
 334     {
 335       memory[0] = val >> 24;
 336       memory[1] = val >> 16;
 337       memory[2] = val >> 8;
 338       memory[3] = val >> 0;
 339     }
 340   else
 341     {
 342       memory[3] = val >> 24;
 343       memory[2] = val >> 16;
 344       memory[1] = val >> 8;
 345       memory[0] = val >> 0;
 346     }
 347 }
 348
 349 int
 350 sim_store_register (sd, rn, memory, length)
 351      SIM_DESC sd ATTRIBUTE_UNUSED;
 352      int rn;
 353      unsigned char *memory;
 354      int length ATTRIBUTE_UNUSED;
 355 {
 356   init ();
 357   if (rn == 25)
 358     {
 359       state->Cpsr = frommem (state, memory);
 360       ARMul_CPSRAltered (state);
 361     }
 362   else
 363     ARMul_SetReg (state, state->Mode, rn, frommem (state, memory));
 364   return -1;
 365 }
 366
 367 int
 368 sim_fetch_register (sd, rn, memory, length)
 369      SIM_DESC sd ATTRIBUTE_UNUSED;
 370      int rn;
 371      unsigned char *memory;
 372      int length ATTRIBUTE_UNUSED;
 373 {
 374   ARMword regval;
 375
 376   init ();
 377   if (rn < 16)
 378     regval = ARMul_GetReg (state, state->Mode, rn);
 379   else if (rn == 25)            /* FIXME: use PS_REGNUM from gdb/config/arm/tm-arm.h */
 380     regval = ARMul_GetCPSR (state);
 381   else
 382     regval = 0;                 /* FIXME: should report an error */
 383   tomem (state, memory, regval);
 384   return -1;
 385 }
 386
 387 SIM_DESC
 388 sim_open (kind, ptr, abfd, argv)
 389      SIM_OPEN_KIND kind;
 390      host_callback *ptr;
 391      struct _bfd *abfd;
 392      char **argv;
 393 {
 394   sim_kind = kind;
 395   if (myname) free (myname);
 396   myname = (char *) xstrdup (argv[0]);
 397   sim_callback = ptr;
 398
 399   /* Decide upon the endian-ness of the processor.
 400      If we can, get the information from the bfd itself.
 401      Otherwise look to see if we have been given a command
 402      line switch that tells us.  Otherwise default to little endian.  */
 403   if (abfd != NULL)
 404     big_endian = bfd_big_endian (abfd);
 405   else if (argv[1] != NULL)
 406     {
 407       int i;
 408
 409       /* Scan for endian-ness switch.  */
 410       for (i = 0; (argv[i] != NULL) && (argv[i][0] != 0); i++)
 411         if (argv[i][0] == '-' && argv[i][1] == 'E')
 412           {
 413             char c;
 414
 415             if ((c = argv[i][2]) == 0)
 416               {
 417                 ++i;
 418                 c = argv[i][0];
 419               }
 420
 421             switch (c)
 422               {
 423               case 0:
 424                 sim_callback->printf_filtered
 425                   (sim_callback, "No argument to -E option provided\n");
 426                 break;
 427
 428               case 'b':
 429               case 'B':
 430                 big_endian = 1;
 431                 break;
 432
 433               case 'l':
 434               case 'L':
 435                 big_endian = 0;
 436                 break;
 437
 438               default:
 439                 sim_callback->printf_filtered
 440                   (sim_callback, "Unrecognised argument to -E option\n");
 441                 break;
 442               }
 443           }
 444     }
 445
 446   return (SIM_DESC) 1;
 447 }
 448
 449 void
 450 sim_close (sd, quitting)
 451      SIM_DESC sd ATTRIBUTE_UNUSED;
 452      int quitting ATTRIBUTE_UNUSED;
 453 {
 454   if (myname) free (myname);
 455   myname = NULL;
 456 }
 457
 458 SIM_RC
 459 sim_load (sd, prog, abfd, from_tty)
 460      SIM_DESC sd;
 461      char *prog;
 462      bfd *abfd;
 463      int from_tty ATTRIBUTE_UNUSED;
 464 {
 465   extern bfd *sim_load_file (); /* ??? Don't know where this should live.  */
 466   bfd *prog_bfd;
 467
 468   prog_bfd = sim_load_file (sd, myname, sim_callback, prog, abfd,
 469                             sim_kind == SIM_OPEN_DEBUG, 0, sim_write);
 470   if (prog_bfd == NULL)
 471     return SIM_RC_FAIL;
 472   ARMul_SetPC (state, bfd_get_start_address (prog_bfd));
 473   if (abfd == NULL)
 474     bfd_close (prog_bfd);
 475   return SIM_RC_OK;
 476 }
 477
 478 void
 479 sim_stop_reason (sd, reason, sigrc)
 480      SIM_DESC sd ATTRIBUTE_UNUSED;
 481      enum sim_stop *reason;
 482      int *sigrc;
 483 {
 484   if (stop_simulator)
 485     {
 486       *reason = sim_stopped;
 487       *sigrc = SIGINT;
 488     }
 489   else if (state->EndCondition == 0)
 490     {
 491       *reason = sim_exited;
 492       *sigrc = state->Reg[0] & 255;
 493     }
 494   else
 495     {
 496       *reason = sim_stopped;
 497       if (state->EndCondition == RDIError_BreakpointReached)
 498         *sigrc = SIGTRAP;
 499       else
 500         *sigrc = 0;
 501     }
 502 }
 503
 504 void
 505 sim_do_command (sd, cmd)
 506      SIM_DESC sd ATTRIBUTE_UNUSED;
 507      char *cmd ATTRIBUTE_UNUSED;
 508 {
 509   (*sim_callback->printf_filtered) (sim_callback,
 510                                     "This simulator does not accept any commands.\n");
 511 }
 512
 513
 514 void
 515 sim_set_callbacks (ptr)
 516      host_callback *ptr;
 517 {
 518   sim_callback = ptr;
 519 }