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/* mem.c --- memory for M32C simulator.

Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc.

Contributed by Red Hat, Inc.

This file is part of the GNU simulators.

This program 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 3 of the License, or

(at your option) any later version.

This program 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, see <http://www.gnu.org/licenses/>.  */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "mem.h"

#include "cpu.h"

#include "syscalls.h"

#include "misc.h"

#define L1_BITS  (10)

#define L2_BITS  (10)

#define OFF_BITS (12)

#define L1_LEN  (1 << L1_BITS)

#define L2_LEN  (1 << L2_BITS)

#define OFF_LEN (1 << OFF_BITS)

static unsigned char **pt[L1_LEN];

/* [ get=0/put=1 ][ byte size ] */

static unsigned int mem_counters[2][4];

#define COUNT(isput,bytes)                                      \

  if (verbose && enable_counting) mem_counters[isput][bytes]++

void

init_mem (void)

{

  int i, j;

  for (i = 0; i < L1_LEN; i++)

    if (pt[i])

      {

        for (j = 0; j < L2_LEN; j++)

          if (pt[i][j])

            free (pt[i][j]);

        free (pt[i]);

      }

  memset (pt, 0, sizeof (pt));

  memset (mem_counters, 0, sizeof (mem_counters));

}

static unsigned char *

mem_ptr (address)

{

  int pt1 = (address >> (L2_BITS + OFF_BITS)) & ((1 << L1_BITS) - 1);

  int pt2 = (address >> OFF_BITS) & ((1 << L2_BITS) - 1);

  int pto = address & ((1 << OFF_BITS) - 1);

  if (address == 0)

    {

      printf ("NULL pointer dereference\n");

      exit (1);

    }

  if (pt[pt1] == 0)

    pt[pt1] = (unsigned char **) calloc (L2_LEN, sizeof (char **));

  if (pt[pt1][pt2] == 0)

    {

      pt[pt1][pt2] = (unsigned char *) malloc (OFF_LEN);

      memset (pt[pt1][pt2], 0, OFF_LEN);

    }

  return pt[pt1][pt2] + pto;

}

static void

used (int rstart, int i, int j)

{

  int rend = i << (L2_BITS + OFF_BITS);

  rend += j << OFF_BITS;

  if (rstart == 0xe0000 && rend == 0xe1000)

    return;

  printf ("mem:   %08x - %08x (%dk bytes)\n", rstart, rend - 1,

          (rend - rstart) / 1024);

}

static char *

mcs (int isput, int bytes)

{

  return comma (mem_counters[isput][bytes]);

}

void

mem_usage_stats ()

{

  int i, j;

  int rstart = 0;

  int pending = 0;

  for (i = 0; i < L1_LEN; i++)

    if (pt[i])

      {

        for (j = 0; j < L2_LEN; j++)

          if (pt[i][j])

            {

              if (!pending)

                {

                  pending = 1;

                  rstart = (i << (L2_BITS + OFF_BITS)) + (j << OFF_BITS);

                }

            }

          else if (pending)

            {

              pending = 0;

              used (rstart, i, j);

            }

      }

    else

      {

        if (pending)

          {

            pending = 0;

            used (rstart, i, 0);

          }

      }

  /*       mem foo: 123456789012 123456789012 123456789012 123456789012

            123456789012 */

  printf ("                 byte        short      pointer         long"

          "        fetch\n");

  printf ("mem get: %12s %12s %12s %12s %12s\n", mcs (0, 1), mcs (0, 2),

          mcs (0, 3), mcs (0, 4), mcs (0, 0));

  printf ("mem put: %12s %12s %12s %12s\n", mcs (1, 1), mcs (1, 2),

          mcs (1, 3), mcs (1, 4));

}

static int tpr = 0;

static void

s (int address, char *dir)

{

  if (tpr == 0)

    printf ("MEM[%0*x] %s", membus_mask == 0xfffff ? 5 : 6, address, dir);

  tpr++;

}

#define S(d) if (trace) s(address, d)

static void

e ()

{

  if (!trace)

    return;

  tpr--;

  if (tpr == 0)

    printf ("\n");

}

#define E() if (trace) e()

void

mem_put_byte (int address, unsigned char value)

{

  unsigned char *m;

  address &= membus_mask;

  m = mem_ptr (address);

  if (trace)

    printf (" %02x", value);

  *m = value;

  switch (address)

    {

    case 0x00e1:

      {

        static int old_led = -1;

        static char *led_on[] =

          { "\033[31m O ", "\033[32m O ", "\033[34m O " };

        static char *led_off[] = { "\033[0m · ", "\033[0m · ", "\033[0m · " };

        int i;

        if (old_led != value)

          {

            fputs ("  ", stdout);

            for (i = 0; i < 3; i++)

              if (value & (1 << i))

                fputs (led_off[i], stdout);

              else

                fputs (led_on[i], stdout);

            fputs ("\033[0m\r", stdout);

            fflush (stdout);

            old_led = value;

          }

      }

      break;

    case 0x3aa: /* uart1tx */

      {

        static int pending_exit = 0;

        if (value == 0)

          {

            if (pending_exit)

              {

                step_result = M32C_MAKE_EXITED(value);

                return;

              }

            pending_exit = 1;

          }

        else

          putchar(value);

      }

      break;

    case 0x400:

      m32c_syscall (value);

      break;

    case 0x401:

      putchar (value);

      break;

    case 0x402:

      printf ("SimTrace: %06lx %02x\n", regs.r_pc, value);

      break;

    case 0x403:

      printf ("SimTrap: %06lx %02x\n", regs.r_pc, value);

      abort ();

    }

}

void

mem_put_qi (int address, unsigned char value)

{

  S ("<=");

  mem_put_byte (address, value & 0xff);

  E ();

  COUNT (1, 1);

}

void

mem_put_hi (int address, unsigned short value)

{

  if (address == 0x402)

    {

      printf ("SimTrace: %06lx %04x\n", regs.r_pc, value);

      return;

    }

  S ("<=");

  mem_put_byte (address, value & 0xff);

  mem_put_byte (address + 1, value >> 8);

  E ();

  COUNT (1, 2);

}

void

mem_put_psi (int address, unsigned long value)

{

  S ("<=");

  mem_put_byte (address, value & 0xff);

  mem_put_byte (address + 1, (value >> 8) & 0xff);

  mem_put_byte (address + 2, value >> 16);

  E ();

  COUNT (1, 3);

}

void

mem_put_si (int address, unsigned long value)

{

  S ("<=");

  mem_put_byte (address, value & 0xff);

  mem_put_byte (address + 1, (value >> 8) & 0xff);

  mem_put_byte (address + 2, (value >> 16) & 0xff);

  mem_put_byte (address + 3, (value >> 24) & 0xff);

  E ();

  COUNT (1, 4);

}

void

mem_put_blk (int address, void *bufptr, int nbytes)

{

  S ("<=");

  if (enable_counting)

    mem_counters[1][1] += nbytes;

  while (nbytes--)

    mem_put_byte (address++, *(unsigned char *) bufptr++);

  E ();

}

unsigned char

mem_get_pc ()

{

  unsigned char *m = mem_ptr (regs.r_pc & membus_mask);

  COUNT (0, 0);

  return *m;

}

static unsigned char

mem_get_byte (int address)

{

  unsigned char *m;

  address &= membus_mask;

  S ("=>");

  m = mem_ptr (address);

  switch (address)

    {

    case 0x3ad: /* uart1c1 */

      E();

      return 2; /* transmitter empty */

      break;

    default:

      if (trace)

        printf (" %02x", *m);

      break;

    }

  E ();

  return *m;

}

unsigned char

mem_get_qi (int address)

{

  unsigned char rv;

  S ("=>");

  rv = mem_get_byte (address);

  COUNT (0, 1);

  E ();

  return rv;

}

unsigned short

mem_get_hi (int address)

{

  unsigned short rv;

  S ("=>");

  rv = mem_get_byte (address);

  rv |= mem_get_byte (address + 1) * 256;

  COUNT (0, 2);

  E ();

  return rv;

}

unsigned long

mem_get_psi (int address)

{

  unsigned long rv;

  S ("=>");

  rv = mem_get_byte (address);

  rv |= mem_get_byte (address + 1) * 256;

  rv |= mem_get_byte (address + 2) * 65536;

  COUNT (0, 3);

  E ();

  return rv;

}

unsigned long

mem_get_si (int address)

{

  unsigned long rv;

  S ("=>");

  rv = mem_get_byte (address);

  rv |= mem_get_byte (address + 1) << 8;

  rv |= mem_get_byte (address + 2) << 16;

  rv |= mem_get_byte (address + 3) << 24;

  COUNT (0, 4);

  E ();

  return rv;

}

void

mem_get_blk (int address, void *bufptr, int nbytes)

{

  S ("=>");

  if (enable_counting)

    mem_counters[0][1] += nbytes;

  while (nbytes--)

    *(char *) bufptr++ = mem_get_byte (address++);

  E ();

}

int

sign_ext (int v, int bits)

{

  if (bits < 32)

    {

      v &= (1 << bits) - 1;

      if (v & (1 << (bits - 1)))

        v -= (1 << bits);

    }

  return v;

}