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:
 220       /* We wouldn't set the machine type with earlier toolchains, so we
 221          explicitly select a processor capable of supporting all ARMs in
 222          32bit mode.  */
 223     case bfd_mach_arm_5:
 224     case bfd_mach_arm_5T:
 225       ARMul_SelectProcessor (state, ARM_v5_Prop);
 226       break;
 227
 228     case bfd_mach_arm_5TE:
 229       ARMul_SelectProcessor (state, ARM_v5_Prop | ARM_v5e_Prop);
 230       break;
 231
 232     case bfd_mach_arm_XScale:
 233       ARMul_SelectProcessor (state, ARM_v5_Prop | ARM_v5e_Prop | ARM_XScale_Prop);
 234       break;
 235
 236     case bfd_mach_arm_4:
 237     case bfd_mach_arm_4T:
 238       ARMul_SelectProcessor (state, ARM_v4_Prop);
 239       break;
 240
 241     case bfd_mach_arm_3:
 242     case bfd_mach_arm_3M:
 243       ARMul_SelectProcessor (state, ARM_Lock_Prop);
 244       break;
 245
 246     case bfd_mach_arm_2:
 247     case bfd_mach_arm_2a:
 248       ARMul_SelectProcessor (state, ARM_Fix26_Prop);
 249       break;
 250     }
 251
 252   if (mach > 3)
 253     {
 254       /* Reset mode to ARM.  A gdb user may rerun a program that had entered
 255          THUMB mode from the start and cause the ARM-mode startup code to be
 256          executed in THUMB mode. */
 257       ARMul_SetCPSR (state, USER32MODE);
 258     }
 259
 260   if (argv != NULL)
 261     {
 262       /*
 263          ** Set up the command line (by laboriously stringing together the
 264          ** environment carefully picked apart by our caller...)
 265        */
 266       /* Free any old stuff */
 267       if (state->CommandLine != NULL)
 268         {
 269           free (state->CommandLine);
 270           state->CommandLine = NULL;
 271         }
 272
 273       /* See how much we need */
 274       for (arg = argv; *arg != NULL; arg++)
 275         argvlen += strlen (*arg) + 1;
 276
 277       /* allocate it... */
 278       state->CommandLine = malloc (argvlen + 1);
 279       if (state->CommandLine != NULL)
 280         {
 281           arg = argv;
 282           state->CommandLine[0] = '\0';
 283           for (arg = argv; *arg != NULL; arg++)
 284             {
 285               strcat (state->CommandLine, *arg);
 286               strcat (state->CommandLine, " ");
 287             }
 288         }
 289     }
 290
 291   if (env != NULL)
 292     {
 293       /* Now see if there's a MEMSIZE spec in the environment */
 294       while (*env)
 295         {
 296           if (strncmp (*env, "MEMSIZE=", sizeof ("MEMSIZE=") - 1) == 0)
 297             {
 298               char *end_of_num;
 299
 300               /* Set up memory limit */
 301               state->MemSize =
 302                 strtoul (*env + sizeof ("MEMSIZE=") - 1, &end_of_num, 0);
 303             }
 304           env++;
 305         }
 306     }
 307
 308   return SIM_RC_OK;
 309 }
 310
 311 void
 312 sim_info (sd, verbose)
 313      SIM_DESC sd ATTRIBUTE_UNUSED;
 314      int verbose ATTRIBUTE_UNUSED;
 315 {
 316 }
 317
 318
 319 static int
 320 frommem (state, memory)
 321      struct ARMul_State *state;
 322      unsigned char *memory;
 323 {
 324   if (state->bigendSig == HIGH)
 325     {
 326       return (memory[0] << 24)
 327         | (memory[1] << 16) | (memory[2] << 8) | (memory[3] << 0);
 328     }
 329   else
 330     {
 331       return (memory[3] << 24)
 332         | (memory[2] << 16) | (memory[1] << 8) | (memory[0] << 0);
 333     }
 334 }
 335
 336
 337 static void
 338 tomem (state, memory, val)
 339      struct ARMul_State *state;
 340      unsigned char *memory;
 341      int val;
 342 {
 343   if (state->bigendSig == HIGH)
 344     {
 345       memory[0] = val >> 24;
 346       memory[1] = val >> 16;
 347       memory[2] = val >> 8;
 348       memory[3] = val >> 0;
 349     }
 350   else
 351     {
 352       memory[3] = val >> 24;
 353       memory[2] = val >> 16;
 354       memory[1] = val >> 8;
 355       memory[0] = val >> 0;
 356     }
 357 }
 358
 359 int
 360 sim_store_register (sd, rn, memory, length)
 361      SIM_DESC sd ATTRIBUTE_UNUSED;
 362      int rn;
 363      unsigned char *memory;
 364      int length ATTRIBUTE_UNUSED;
 365 {
 366   init ();
 367
 368   if (rn == 25)
 369     {
 370       state->Cpsr = frommem (state, memory);
 371       ARMul_CPSRAltered (state);
 372     }
 373   else
 374     ARMul_SetReg (state, state->Mode, rn, frommem (state, memory));
 375   return -1;
 376 }
 377
 378 int
 379 sim_fetch_register (sd, rn, memory, length)
 380      SIM_DESC sd ATTRIBUTE_UNUSED;
 381      int rn;
 382      unsigned char *memory;
 383      int length ATTRIBUTE_UNUSED;
 384 {
 385   ARMword regval;
 386
 387   init ();
 388
 389   if (rn < 16)
 390     regval = ARMul_GetReg (state, state->Mode, rn);
 391   else if (rn == 25)            /* FIXME: use PS_REGNUM from gdb/config/arm/tm-arm.h */
 392     regval = ARMul_GetCPSR (state);
 393   else
 394     regval = 0;                 /* FIXME: should report an error */
 395   tomem (state, memory, regval);
 396   return -1;
 397 }
 398
 399 SIM_DESC
 400 sim_open (kind, ptr, abfd, argv)
 401      SIM_OPEN_KIND kind;
 402      host_callback *ptr;
 403      struct _bfd *abfd;
 404      char **argv;
 405 {
 406   sim_kind = kind;
 407   if (myname) free (myname);
 408   myname = (char *) xstrdup (argv[0]);
 409   sim_callback = ptr;
 410
 411   /* Decide upon the endian-ness of the processor.
 412      If we can, get the information from the bfd itself.
 413      Otherwise look to see if we have been given a command
 414      line switch that tells us.  Otherwise default to little endian.  */
 415   if (abfd != NULL)
 416     big_endian = bfd_big_endian (abfd);
 417   else if (argv[1] != NULL)
 418     {
 419       int i;
 420
 421       /* Scan for endian-ness switch.  */
 422       for (i = 0; (argv[i] != NULL) && (argv[i][0] != 0); i++)
 423         if (argv[i][0] == '-' && argv[i][1] == 'E')
 424           {
 425             char c;
 426
 427             if ((c = argv[i][2]) == 0)
 428               {
 429                 ++i;
 430                 c = argv[i][0];
 431               }
 432
 433             switch (c)
 434               {
 435               case 0:
 436                 sim_callback->printf_filtered
 437                   (sim_callback, "No argument to -E option provided\n");
 438                 break;
 439
 440               case 'b':
 441               case 'B':
 442                 big_endian = 1;
 443                 break;
 444
 445               case 'l':
 446               case 'L':
 447                 big_endian = 0;
 448                 break;
 449
 450               default:
 451                 sim_callback->printf_filtered
 452                   (sim_callback, "Unrecognised argument to -E option\n");
 453                 break;
 454               }
 455           }
 456     }
 457
 458   return (SIM_DESC) 1;
 459 }
 460
 461 void
 462 sim_close (sd, quitting)
 463      SIM_DESC sd ATTRIBUTE_UNUSED;
 464      int quitting ATTRIBUTE_UNUSED;
 465 {
 466   if (myname) free (myname);
 467   myname = NULL;
 468 }
 469
 470 SIM_RC
 471 sim_load (sd, prog, abfd, from_tty)
 472      SIM_DESC sd;
 473      char *prog;
 474      bfd *abfd;
 475      int from_tty ATTRIBUTE_UNUSED;
 476 {
 477   extern bfd *sim_load_file (); /* ??? Don't know where this should live.  */
 478   bfd *prog_bfd;
 479
 480   prog_bfd = sim_load_file (sd, myname, sim_callback, prog, abfd,
 481                             sim_kind == SIM_OPEN_DEBUG, 0, sim_write);
 482   if (prog_bfd == NULL)
 483     return SIM_RC_FAIL;
 484   ARMul_SetPC (state, bfd_get_start_address (prog_bfd));
 485   if (abfd == NULL)
 486     bfd_close (prog_bfd);
 487   return SIM_RC_OK;
 488 }
 489
 490 void
 491 sim_stop_reason (sd, reason, sigrc)
 492      SIM_DESC sd ATTRIBUTE_UNUSED;
 493      enum sim_stop *reason;
 494      int *sigrc;
 495 {
 496   if (stop_simulator)
 497     {
 498       *reason = sim_stopped;
 499       *sigrc = SIGINT;
 500     }
 501   else if (state->EndCondition == 0)
 502     {
 503       *reason = sim_exited;
 504       *sigrc = state->Reg[0] & 255;
 505     }
 506   else
 507     {
 508       *reason = sim_stopped;
 509       if (state->EndCondition == RDIError_BreakpointReached)
 510         *sigrc = SIGTRAP;
 511       else
 512         *sigrc = 0;
 513     }
 514 }
 515
 516 void
 517 sim_do_command (sd, cmd)
 518      SIM_DESC sd ATTRIBUTE_UNUSED;
 519      char *cmd ATTRIBUTE_UNUSED;
 520 {
 521   (*sim_callback->printf_filtered) (sim_callback,
 522                                     "This simulator does not accept any commands.\n");
 523 }
 524
 525
 526 void
 527 sim_set_callbacks (ptr)
 528      host_callback *ptr;
 529 {
 530   sim_callback = ptr;
 531 }