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/* run front end support for arm

   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.

This file is part of ARM SIM.

GNU CC is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU CC is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* This file provides the interface between the simulator and run.c and gdb

   (when the simulator is linked with gdb).

   All simulator interaction should go through this file.  */

#include <stdio.h>

#include <stdarg.h>

#include <string.h>

#include <bfd.h>

#include <signal.h>

#include "callback.h"

#include "remote-sim.h"

#include "armdefs.h"

#include "armemu.h"

#include "dbg_rdi.h"

#include "ansidecl.h"

host_callback *sim_callback;

static struct ARMul_State *state;

/* Who is using the simulator.  */

static SIM_OPEN_KIND sim_kind;

/* argv[0] */

static char *myname;

/* Memory size in bytes.  */

static int mem_size = (1 << 21);

/* Non-zero to display start up banner, and maybe other things.  */

static int verbosity;

/* Non-zero to set big endian mode.  */

static int big_endian;

int stop_simulator;

static void

init ()

{

  static int done;

  if (!done)

    {

      ARMul_EmulateInit ();

      state = ARMul_NewState ();

      state->bigendSig = (big_endian ? HIGH : LOW);

      ARMul_MemoryInit (state, mem_size);

      ARMul_OSInit (state);

      ARMul_CoProInit (state);

      state->verbose = verbosity;

      done = 1;

    }

}

/* Set verbosity level of simulator.

   This is not intended to produce detailed tracing or debugging information.

   Just summaries.  */

/* FIXME: common/run.c doesn't do this yet.  */

void

sim_set_verbose (v)

     int v;

{

  verbosity = v;

}

/* Set the memory size to SIZE bytes.

   Must be called before initializing simulator.  */

/* FIXME: Rename to sim_set_mem_size.  */

void

sim_size (size)

     int size;

{

  mem_size = size;

}

void

ARMul_ConsolePrint (ARMul_State * state, const char *format, ...)

{

  va_list ap;

  if (state->verbose)

    {

      va_start (ap, format);

      vprintf (format, ap);

      va_end (ap);

    }

}

ARMword

ARMul_Debug (ARMul_State * state ATTRIBUTE_UNUSED, ARMword pc ATTRIBUTE_UNUSED, ARMword instr ATTRIBUTE_UNUSED)

{

  return 0;

}

int

sim_write (sd, addr, buffer, size)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     SIM_ADDR addr;

     unsigned char *buffer;

     int size;

{

  int i;

  init ();

  for (i = 0; i < size; i++)

    {

      ARMul_WriteByte (state, addr + i, buffer[i]);

    }

  return size;

}

int

sim_read (sd, addr, buffer, size)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     SIM_ADDR addr;

     unsigned char *buffer;

     int size;

{

  int i;

  init ();

  for (i = 0; i < size; i++)

    {

      buffer[i] = ARMul_ReadByte (state, addr + i);

    }

  return size;

}

int

sim_trace (sd)

     SIM_DESC sd ATTRIBUTE_UNUSED;

{

  (*sim_callback->printf_filtered) (sim_callback,

                                    "This simulator does not support tracing\n");

  return 1;

}

int

sim_stop (sd)

     SIM_DESC sd ATTRIBUTE_UNUSED;

{

  state->Emulate = STOP;

  stop_simulator = 1;

  return 1;

}

void

sim_resume (sd, step, siggnal)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     int step;

     int siggnal ATTRIBUTE_UNUSED;

{

  state->EndCondition = 0;

  stop_simulator = 0;

  if (step)

    {

      state->Reg[15] = ARMul_DoInstr (state);

      if (state->EndCondition == 0)

        state->EndCondition = RDIError_BreakpointReached;

    }

  else

    {

#if 1                           /* JGS */

      state->NextInstr = RESUME;        /* treat as PC change */

#endif

      state->Reg[15] = ARMul_DoProg (state);

    }

  FLUSHPIPE;

}

SIM_RC

sim_create_inferior (sd, abfd, argv, env)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     struct _bfd *abfd;

     char **argv;

     char **env;

{

  int argvlen = 0;

  char **arg;

  if (abfd != NULL)

    ARMul_SetPC (state, bfd_get_start_address (abfd));

  else

    ARMul_SetPC (state, 0);      /* ??? */

#if 1                           /* JGS */

  /* We explicitly select a processor capable of supporting the ARM

     32bit mode, and then we force the simulated CPU into the 32bit

     User mode: */

  ARMul_SelectProcessor (state, ARM600);

  ARMul_SetCPSR (state, USER32MODE);

#endif

  if (argv != NULL)

    {

      /*

         ** Set up the command line (by laboriously stringing together the

         ** environment carefully picked apart by our caller...)

       */

      /* Free any old stuff */

      if (state->CommandLine != NULL)

        {

          free (state->CommandLine);

          state->CommandLine = NULL;

        }

      /* See how much we need */

      for (arg = argv; *arg != NULL; arg++)

        argvlen += strlen (*arg) + 1;

      /* allocate it... */

      state->CommandLine = malloc (argvlen + 1);

      if (state->CommandLine != NULL)

        {

          arg = argv;

          state->CommandLine[0] = '\0';

          for (arg = argv; *arg != NULL; arg++)

            {

              strcat (state->CommandLine, *arg);

              strcat (state->CommandLine, " ");

            }

        }

    }

  if (env != NULL)

    {

      /* Now see if there's a MEMSIZE spec in the environment */

      while (*env)

        {

          if (strncmp (*env, "MEMSIZE=", sizeof ("MEMSIZE=") - 1) == 0)

            {

              char *end_of_num;

              /* Set up memory limit */

              state->MemSize =

                strtoul (*env + sizeof ("MEMSIZE=") - 1, &end_of_num, 0);

            }

          env++;

        }

    }

  return SIM_RC_OK;

}

void

sim_info (sd, verbose)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     int verbose ATTRIBUTE_UNUSED;

{

}

static int

frommem (state, memory)

     struct ARMul_State *state;

     unsigned char *memory;

{

  if (state->bigendSig == HIGH)

    {

      return (memory[0] << 24)

        | (memory[1] << 16) | (memory[2] << 8) | (memory[3] << 0);

    }

  else

    {

      return (memory[3] << 24)

        | (memory[2] << 16) | (memory[1] << 8) | (memory[0] << 0);

    }

}

static void

tomem (state, memory, val)

     struct ARMul_State *state;

     unsigned char *memory;

     int val;

{

  if (state->bigendSig == HIGH)

    {

      memory[0] = val >> 24;

      memory[1] = val >> 16;

      memory[2] = val >> 8;

      memory[3] = val >> 0;

    }

  else

    {

      memory[3] = val >> 24;

      memory[2] = val >> 16;

      memory[1] = val >> 8;

      memory[0] = val >> 0;

    }

}

int

sim_store_register (sd, rn, memory, length)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     int rn;

     unsigned char *memory;

     int length ATTRIBUTE_UNUSED;

{

  init ();

  ARMul_SetReg (state, state->Mode, rn, frommem (state, memory));

  return -1;

}

int

sim_fetch_register (sd, rn, memory, length)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     int rn;

     unsigned char *memory;

     int length ATTRIBUTE_UNUSED;

{

  ARMword regval;

  init ();

  if (rn < 16)

    regval = ARMul_GetReg (state, state->Mode, rn);

  else if (rn == 25)            /* FIXME: use PS_REGNUM from gdb/config/arm/tm-arm.h */

    regval = ARMul_GetCPSR (state);

  else

    regval = 0;                  /* FIXME: should report an error */

  tomem (state, memory, regval);

  return -1;

}

SIM_DESC

sim_open (kind, ptr, abfd, argv)

     SIM_OPEN_KIND kind;

     host_callback *ptr;

     struct _bfd *abfd;

     char **argv;

{

  sim_kind = kind;

  if (myname) free (myname);

  myname = xstrdup (argv[0]);

  sim_callback = ptr;

  /* Decide upon the endian-ness of the processor.

     If we can, get the information from the bfd itself.

     Otherwise look to see if we have been given a command

     line switch that tells us.  Otherwise default to little endian.  */

  if (abfd != NULL)

    big_endian = bfd_big_endian (abfd);

  else if (argv[1] != NULL)

    {

      int i;

      /* Scan for endian-ness switch.  */

      for (i = 0; (argv[i] != NULL) && (argv[i][0] != 0); i++)

        if (argv[i][0] == '-' && argv[i][1] == 'E')

          {

            char c;

            if ((c = argv[i][2]) == 0)

              {

                ++i;

                c = argv[i][0];

              }

            switch (c)

              {

              case 0:

                sim_callback->printf_filtered

                  (sim_callback, "No argument to -E option provided\n");

                break;

              case 'b':

              case 'B':

                big_endian = 1;

                break;

              case 'l':

              case 'L':

                big_endian = 0;

                break;

              default:

                sim_callback->printf_filtered

                  (sim_callback, "Unrecognised argument to -E option\n");

                break;

              }

          }

    }

  return (SIM_DESC) 1;

}

void

sim_close (sd, quitting)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     int quitting ATTRIBUTE_UNUSED;

{

  if (myname) free (myname);

  myname = NULL;

}

SIM_RC

sim_load (sd, prog, abfd, from_tty)

     SIM_DESC sd;

     char *prog;

     bfd *abfd;

     int from_tty ATTRIBUTE_UNUSED;

{

  extern bfd *sim_load_file (); /* ??? Don't know where this should live.  */

  bfd *prog_bfd;

  prog_bfd = sim_load_file (sd, myname, sim_callback, prog, abfd,

                            sim_kind == SIM_OPEN_DEBUG, 0, sim_write);

  if (prog_bfd == NULL)

    return SIM_RC_FAIL;

  ARMul_SetPC (state, bfd_get_start_address (prog_bfd));

  if (abfd == NULL)

    bfd_close (prog_bfd);

  return SIM_RC_OK;

}

void

sim_stop_reason (sd, reason, sigrc)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     enum sim_stop *reason;

     int *sigrc;

{

  if (stop_simulator)

    {

      *reason = sim_stopped;

      *sigrc = SIGINT;

    }

  else if (state->EndCondition == 0)

    {

      *reason = sim_exited;

      *sigrc = state->Reg[0] & 255;

    }

  else

    {

      *reason = sim_stopped;

      if (state->EndCondition == RDIError_BreakpointReached)

        *sigrc = SIGTRAP;

      else

        *sigrc = 0;

    }

}

void

sim_do_command (sd, cmd)

     SIM_DESC sd ATTRIBUTE_UNUSED;

     char *cmd ATTRIBUTE_UNUSED;

{

  (*sim_callback->printf_filtered) (sim_callback,

                                    "This simulator does not accept any commands.\n");

}

void

sim_set_callbacks (ptr)

     host_callback *ptr;

{

  sim_callback = ptr;

}