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

Copyright (C) 2005, 2007, 2008, 2009, 2010 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/>.  */

/* This slows down the simulator and we get some false negatives from

   gcc, like when it uses a long-sized hole to hold a byte-sized

   variable, knowing that it doesn't care about the other bits.  But,

   if you need to track down a read-from-unitialized bug, set this to

   1.  */

#define RDCHECK 0

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "mem.h"

#include "cpu.h"

#include "syscalls.h"

#include "misc.h"

#include "err.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];

static unsigned char **ptr[L1_LEN];

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

static unsigned int mem_counters[2][5];

#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 (ptr, 0, sizeof (ptr));

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

}

enum mem_ptr_action

{

  MPA_WRITING,

  MPA_READING,

  MPA_CONTENT_TYPE

};

static unsigned char *

mem_ptr (unsigned long address, enum mem_ptr_action action)

{

  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)

    execution_error (SIM_ERR_NULL_POINTER_DEREFERENCE, 0);

  if (pt[pt1] == 0)

    {

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

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

    }

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

    {

      if (action == MPA_READING)

        execution_error (SIM_ERR_READ_UNWRITTEN_PAGES, address);

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

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

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

      memset (ptr[pt1][pt2], MC_UNINIT, OFF_LEN);

    }

  else if (action == MPA_READING

           && ptr[pt1][pt2][pto] == MC_UNINIT)

    execution_error (SIM_ERR_READ_UNWRITTEN_BYTES, address);

  if (action == MPA_WRITING)

    {

      if (ptr[pt1][pt2][pto] == MC_PUSHED_PC)

        execution_error (SIM_ERR_CORRUPT_STACK, address);

      ptr[pt1][pt2][pto] = MC_DATA;

    }

  if (action == MPA_CONTENT_TYPE)

    return ptr[pt1][pt2] + pto;

  return pt[pt1][pt2] + pto;

}

static inline int

is_reserved_address (unsigned int address)

{

  return (address >= 0x00020000 && address < 0x00080000)

    ||   (address >= 0x00100000 && address < 0x01000000)

    ||   (address >= 0x08000000 && address < 0xff000000);

}

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        3byte         long"

          "       opcode\n");

  if (verbose > 1)

    {

      /* Only use comma separated numbers when being very verbose.

         Comma separated numbers are hard to parse in awk scripts.  */

      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));

    }

  else

    {

      printf ("mem get: %12u %12u %12u %12u %12u\n",

              mem_counters[0][1], mem_counters[0][2],

              mem_counters[0][3], mem_counters[0][4],

              mem_counters[0][0]);

      printf ("mem put: %12u %12u %12u %12u\n",

              mem_counters [1][1], mem_counters [1][2],

              mem_counters [1][3], mem_counters [1][4]);

    }

}

unsigned long

mem_usage_cycles (void)

{

  unsigned long rv = mem_counters[0][0];

  rv += mem_counters[0][1] * 1;

  rv += mem_counters[0][2] * 2;

  rv += mem_counters[0][3] * 3;

  rv += mem_counters[0][4] * 4;

  rv += mem_counters[1][1] * 1;

  rv += mem_counters[1][2] * 2;

  rv += mem_counters[1][3] * 3;

  rv += mem_counters[1][4] * 4;

  return rv;

}

static int tpr = 0;

static void

s (int address, char *dir)

{

  if (tpr == 0)

    printf ("MEM[%08x] %s", address, dir);

  tpr++;

}

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

static void

e ()

{

  if (!trace)

    return;

  tpr--;

  if (tpr == 0)

    printf ("\n");

}

static char

mtypec (int address)

{

  unsigned char *cp = mem_ptr (address, MPA_CONTENT_TYPE);

  return "udp"[*cp];

}

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

void

mem_put_byte (unsigned int address, unsigned char value)

{

  unsigned char *m;

  char tc = ' ';

  if (trace)

    tc = mtypec (address);

  m = mem_ptr (address, MPA_WRITING);

  if (trace)

    printf (" %02x%c", value, tc);

  *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 = RX_MAKE_EXITED(value);

                return;

              }

            pending_exit = 1;

          }

        else

          putchar(value);

      }

      break;

    default:

      if (is_reserved_address (address))

        generate_access_exception ();

    }

}

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)

{

  S ("<=");

  if (rx_big_endian)

    {

      mem_put_byte (address, value >> 8);

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

    }

  else

    {

      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 ("<=");

  if (rx_big_endian)

    {

      mem_put_byte (address, value >> 16);

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

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

    }

  else

    {

      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 ("<=");

  if (rx_big_endian)

    {

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

      mem_put_byte (address + 1, (value >> 16) & 0xff);

      mem_put_byte (address + 2, (value >> 8) & 0xff);

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

    }

  else

    {

      mem_put_byte (address + 0, 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 (int address)

{

  unsigned char *m = mem_ptr (address, MPA_READING);

  COUNT (0, 0);

  return *m;

}

static unsigned char

mem_get_byte (unsigned int address)

{

  unsigned char *m;

  S ("=>");

  m = mem_ptr (address, MPA_READING);

  switch (address)

    {

    case 0x3ad: /* uart1c1 */

      E();

      return 2; /* transmitter empty */

      break;

    default:

      if (trace)

        printf (" %02x%c", *m, mtypec (address));

      if (is_reserved_address (address))

        generate_access_exception ();

      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 ("=>");

  if (rx_big_endian)

    {

      rv = mem_get_byte (address) << 8;

      rv |= mem_get_byte (address + 1);

    }

  else

    {

      rv = mem_get_byte (address);

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

    }

  COUNT (0, 2);

  E ();

  return rv;

}

unsigned long

mem_get_psi (int address)

{

  unsigned long rv;

  S ("=>");

  if (rx_big_endian)

    {

      rv = mem_get_byte (address + 2);

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

      rv |= mem_get_byte (address) << 16;

    }

  else

    {

      rv = mem_get_byte (address);

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

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

    }

  COUNT (0, 3);

  E ();

  return rv;

}

unsigned long

mem_get_si (int address)

{

  unsigned long rv;

  S ("=>");

  if (rx_big_endian)

    {

      rv = mem_get_byte (address + 3);

      rv |= mem_get_byte (address + 2) << 8;

      rv |= mem_get_byte (address + 1) << 16;

      rv |= mem_get_byte (address) << 24;

    }

  else

    {

      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;

}

void

mem_set_content_type (int address, enum mem_content_type type)

{

  unsigned char *mt = mem_ptr (address, MPA_CONTENT_TYPE);

  *mt = type;

}

void

mem_set_content_range (int start_address, int end_address, enum mem_content_type type)

{

  while (start_address < end_address)

    {

      int sz, ofs;

      unsigned char *mt;

      sz = end_address - start_address;

      ofs = start_address % L1_LEN;

      if (sz + ofs > L1_LEN)

        sz = L1_LEN - ofs;

      mt = mem_ptr (start_address, MPA_CONTENT_TYPE);

      memset (mt, type, sz);

      start_address += sz;

    }

}

enum mem_content_type

mem_get_content_type (int address)

{

  unsigned char *mt = mem_ptr (address, MPA_CONTENT_TYPE);

  return *mt;

}