sim/m32c/mem.c - binutils-gdb - Git at Google

 /* 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;
 }
	/* 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;
	}