615 lines
12 KiB
C
615 lines
12 KiB
C
/* mem.c --- memory for M32C simulator.
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Copyright (C) 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
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Contributed by Red Hat, Inc.
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This file is part of the GNU simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#ifdef HAVE_TERMIOS_H
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#include <termios.h>
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#endif
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#include "mem.h"
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#include "cpu.h"
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#include "syscalls.h"
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#include "misc.h"
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#ifdef TIMER_A
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#include "int.h"
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#include "timer_a.h"
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#endif
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#define L1_BITS (10)
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#define L2_BITS (10)
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#define OFF_BITS (12)
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#define L1_LEN (1 << L1_BITS)
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#define L2_LEN (1 << L2_BITS)
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#define OFF_LEN (1 << OFF_BITS)
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static unsigned char **pt[L1_LEN];
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#ifdef HAVE_TERMIOS_H
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int m32c_console_ifd = 0;
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#endif
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int m32c_console_ofd = 1;
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#ifdef HAVE_TERMIOS_H
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int m32c_use_raw_console = 0;
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#endif
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#ifdef TIMER_A
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Timer_A timer_a;
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#endif
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/* [ get=0/put=1 ][ byte size ] */
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static unsigned int mem_counters[2][5];
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#define COUNT(isput,bytes) \
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if (verbose && enable_counting) mem_counters[isput][bytes]++
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void
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init_mem (void)
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{
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int i, j;
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for (i = 0; i < L1_LEN; i++)
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if (pt[i])
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{
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for (j = 0; j < L2_LEN; j++)
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if (pt[i][j])
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free (pt[i][j]);
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free (pt[i]);
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}
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memset (pt, 0, sizeof (pt));
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memset (mem_counters, 0, sizeof (mem_counters));
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}
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static unsigned char *
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mem_ptr (address)
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{
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static int recursing = 0;
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int pt1 = (address >> (L2_BITS + OFF_BITS)) & ((1 << L1_BITS) - 1);
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int pt2 = (address >> OFF_BITS) & ((1 << L2_BITS) - 1);
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int pto = address & ((1 << OFF_BITS) - 1);
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if (address == 0 && !recursing)
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{
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recursing = 1;
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put_reg (pc, m32c_opcode_pc);
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printf ("NULL pointer dereference at pc=0x%x\n", get_reg (pc));
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step_result = M32C_MAKE_HIT_BREAK ();
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#if 0
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/* This code can be re-enabled to help diagnose NULL pointer
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bugs that aren't debuggable in GDB. */
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m32c_dump_all_registers ();
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exit (1);
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#endif
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}
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if (pt[pt1] == 0)
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pt[pt1] = (unsigned char **) calloc (L2_LEN, sizeof (char **));
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if (pt[pt1][pt2] == 0)
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{
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pt[pt1][pt2] = (unsigned char *) malloc (OFF_LEN);
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memset (pt[pt1][pt2], 0, OFF_LEN);
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}
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return pt[pt1][pt2] + pto;
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}
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static void
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used (int rstart, int i, int j)
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{
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int rend = i << (L2_BITS + OFF_BITS);
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rend += j << OFF_BITS;
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if (rstart == 0xe0000 && rend == 0xe1000)
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return;
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printf ("mem: %08x - %08x (%dk bytes)\n", rstart, rend - 1,
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(rend - rstart) / 1024);
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}
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static char *
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mcs (int isput, int bytes)
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{
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return comma (mem_counters[isput][bytes]);
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}
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void
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mem_usage_stats ()
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{
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int i, j;
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int rstart = 0;
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int pending = 0;
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for (i = 0; i < L1_LEN; i++)
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if (pt[i])
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{
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for (j = 0; j < L2_LEN; j++)
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if (pt[i][j])
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{
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if (!pending)
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{
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pending = 1;
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rstart = (i << (L2_BITS + OFF_BITS)) + (j << OFF_BITS);
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}
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}
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else if (pending)
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{
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pending = 0;
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used (rstart, i, j);
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}
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}
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else
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{
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if (pending)
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{
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pending = 0;
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used (rstart, i, 0);
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}
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}
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/* mem foo: 123456789012 123456789012 123456789012 123456789012
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123456789012 */
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printf (" byte short pointer long"
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" fetch\n");
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printf ("mem get: %12s %12s %12s %12s %12s\n", mcs (0, 1), mcs (0, 2),
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mcs (0, 3), mcs (0, 4), mcs (0, 0));
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printf ("mem put: %12s %12s %12s %12s\n", mcs (1, 1), mcs (1, 2),
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mcs (1, 3), mcs (1, 4));
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}
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static int tpr = 0;
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static void
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s (int address, char *dir)
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{
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if (tpr == 0)
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printf ("MEM[%0*x] %s", membus_mask == 0xfffff ? 5 : 6, address, dir);
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tpr++;
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}
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#define S(d) if (trace) s(address, d)
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static void
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e ()
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{
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if (!trace)
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return;
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tpr--;
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if (tpr == 0)
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printf ("\n");
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}
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#define E() if (trace) e()
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extern int m32c_disassemble;
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void
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mem_put_byte (int address, unsigned char value)
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{
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unsigned char *m;
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address &= membus_mask;
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m = mem_ptr (address);
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if (trace)
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printf (" %02x", value);
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*m = value;
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switch (address)
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{
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case 0x00e1:
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{
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static int old_led = -1;
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static char *led_on[] =
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{ "\033[31m O ", "\033[32m O ", "\033[34m O " };
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static char *led_off[] = { "\033[0m <20> ", "\033[0m <20> ", "\033[0m <20> " };
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int i;
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if (old_led != value)
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{
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fputs (" ", stdout);
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for (i = 0; i < 3; i++)
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if (value & (1 << i))
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fputs (led_off[i], stdout);
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else
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fputs (led_on[i], stdout);
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fputs ("\033[0m\r", stdout);
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fflush (stdout);
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old_led = value;
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}
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}
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break;
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#ifdef TIMER_A
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/* M32C Timer A */
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case 0x346: /* TA0low */
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timer_a.count = (timer_a.count & 0xff00) | value;
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timer_a.reload = timer_a.count;
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break;
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case 0x347: /* TA0high */
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timer_a.count = (timer_a.count & 0x00ff) | (value << 8);
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timer_a.reload = timer_a.count;
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break;
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case 0x340: /* TABSR */
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timer_a.bsr = value;
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break;
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case 0x356: /* TA0MR */
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timer_a.mode = value;
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break;
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case 0x35f: /* TCSPR */
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timer_a.tcspr = value;
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break;
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case 0x006c: /* TA0IC */
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timer_a.ic = value;
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break;
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/* R8C Timer RA */
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case 0x100: /* TRACR */
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timer_a.bsr = value;
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break;
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case 0x102: /* TRAMR */
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timer_a.mode = value;
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break;
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case 0x104: /* TRA */
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timer_a.count = value;
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timer_a.reload = value;
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break;
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case 0x103: /* TRAPRE */
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timer_a.tcspr = value;
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break;
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case 0x0056: /* TA0IC */
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timer_a.ic = value;
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break;
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#endif
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case 0x2ea: /* m32c uart1tx */
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case 0x3aa: /* m16c uart1tx */
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{
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static int pending_exit = 0;
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if (value == 0)
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{
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if (pending_exit)
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{
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step_result = M32C_MAKE_EXITED (value);
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return;
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}
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pending_exit = 1;
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}
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else
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{
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write (m32c_console_ofd, &value, 1);
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}
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}
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break;
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case 0x400:
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m32c_syscall (value);
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break;
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case 0x401:
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putchar (value);
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break;
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case 0x402:
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printf ("SimTrace: %06lx %02x\n", regs.r_pc, value);
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break;
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case 0x403:
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printf ("SimTrap: %06lx %02x\n", regs.r_pc, value);
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abort ();
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}
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}
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void
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mem_put_qi (int address, unsigned char value)
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{
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S ("<=");
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mem_put_byte (address, value & 0xff);
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E ();
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COUNT (1, 1);
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}
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void
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mem_put_hi (int address, unsigned short value)
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{
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if (address == 0x402)
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{
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printf ("SimTrace: %06lx %04x\n", regs.r_pc, value);
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return;
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}
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S ("<=");
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mem_put_byte (address, value & 0xff);
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mem_put_byte (address + 1, value >> 8);
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E ();
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COUNT (1, 2);
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}
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void
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mem_put_psi (int address, unsigned long value)
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{
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S ("<=");
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mem_put_byte (address, value & 0xff);
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mem_put_byte (address + 1, (value >> 8) & 0xff);
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mem_put_byte (address + 2, value >> 16);
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E ();
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COUNT (1, 3);
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}
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void
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mem_put_si (int address, unsigned long value)
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{
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S ("<=");
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mem_put_byte (address, value & 0xff);
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mem_put_byte (address + 1, (value >> 8) & 0xff);
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mem_put_byte (address + 2, (value >> 16) & 0xff);
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mem_put_byte (address + 3, (value >> 24) & 0xff);
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E ();
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COUNT (1, 4);
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}
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void
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mem_put_blk (int address, void *bufptr, int nbytes)
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{
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S ("<=");
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if (enable_counting)
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mem_counters[1][1] += nbytes;
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while (nbytes--)
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mem_put_byte (address++, *(unsigned char *) bufptr++);
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E ();
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}
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unsigned char
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mem_get_pc ()
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{
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unsigned char *m = mem_ptr (regs.r_pc & membus_mask);
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COUNT (0, 0);
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return *m;
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}
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#ifdef HAVE_TERMIOS_H
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static int console_raw = 0;
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static struct termios oattr;
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static int
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stdin_ready ()
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{
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fd_set ifd;
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int n;
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struct timeval t;
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t.tv_sec = 0;
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t.tv_usec = 0;
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FD_ZERO (&ifd);
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FD_SET (m32c_console_ifd, &ifd);
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n = select (1, &ifd, 0, 0, &t);
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return n > 0;
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}
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void
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m32c_sim_restore_console ()
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{
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if (console_raw)
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tcsetattr (m32c_console_ifd, TCSANOW, &oattr);
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console_raw = 0;
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}
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#endif
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static unsigned char
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mem_get_byte (int address)
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{
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unsigned char *m;
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address &= membus_mask;
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m = mem_ptr (address);
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switch (address)
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{
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#ifdef HAVE_TERMIOS_H
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case 0x2ed: /* m32c uart1c1 */
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case 0x3ad: /* m16c uart1c1 */
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if (!console_raw && m32c_use_raw_console)
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{
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struct termios attr;
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tcgetattr (m32c_console_ifd, &attr);
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tcgetattr (m32c_console_ifd, &oattr);
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/* We want each key to be sent as the user presses them. */
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attr.c_lflag &= ~(ICANON | ECHO | ECHOE);
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tcsetattr (m32c_console_ifd, TCSANOW, &attr);
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console_raw = 1;
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atexit (m32c_sim_restore_console);
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}
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if (stdin_ready ())
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return 0x02; /* tx empty and rx full */
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else
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return 0x0a; /* transmitter empty */
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case 0x2ee: /* m32c uart1 rx */
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{
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char c;
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read (m32c_console_ifd, &c, 1);
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if (m32c_console_ifd == 0 && c == 3) /* Ctrl-C */
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{
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printf ("Ctrl-C!\n");
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exit (0);
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}
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if (m32c_console_ifd != 1)
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{
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if (isgraph (c))
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printf ("\033[31m%c\033[0m", c);
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else
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printf ("\033[31m%02x\033[0m", c);
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}
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return c;
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}
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#endif
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#ifdef TIMER_A
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case 0x346: /* TA0low */
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return timer_a.count & 0xff;
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case 0x347: /* TA0high */
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return (timer_a.count >> 8) & 0xff;
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case 0x104: /* TRA */
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return timer_a.count;
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#endif
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default:
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/* In case both cases above are not included. */
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;
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}
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S ("=>");
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if (trace)
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printf (" %02x", *m);
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E ();
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return *m;
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}
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unsigned char
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mem_get_qi (int address)
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{
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unsigned char rv;
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S ("=>");
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rv = mem_get_byte (address);
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COUNT (0, 1);
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E ();
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return rv;
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}
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unsigned short
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mem_get_hi (int address)
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{
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unsigned short rv;
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S ("=>");
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rv = mem_get_byte (address);
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rv |= mem_get_byte (address + 1) * 256;
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COUNT (0, 2);
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E ();
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return rv;
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}
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unsigned long
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mem_get_psi (int address)
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{
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unsigned long rv;
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S ("=>");
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rv = mem_get_byte (address);
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rv |= mem_get_byte (address + 1) * 256;
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rv |= mem_get_byte (address + 2) * 65536;
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COUNT (0, 3);
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E ();
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return rv;
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}
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unsigned long
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mem_get_si (int address)
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{
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unsigned long rv;
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S ("=>");
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rv = mem_get_byte (address);
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rv |= mem_get_byte (address + 1) << 8;
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rv |= mem_get_byte (address + 2) << 16;
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rv |= mem_get_byte (address + 3) << 24;
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COUNT (0, 4);
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E ();
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return rv;
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}
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void
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mem_get_blk (int address, void *bufptr, int nbytes)
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{
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S ("=>");
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if (enable_counting)
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mem_counters[0][1] += nbytes;
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while (nbytes--)
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*(char *) bufptr++ = mem_get_byte (address++);
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E ();
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}
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int
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sign_ext (int v, int bits)
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{
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if (bits < 32)
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{
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v &= (1 << bits) - 1;
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if (v & (1 << (bits - 1)))
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v -= (1 << bits);
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}
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return v;
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}
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#if TIMER_A
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void
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update_timer_a ()
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{
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if (timer_a.bsr & 1)
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{
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timer_a.prescale--;
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if (timer_a.prescale < 0)
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{
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if (A24)
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{
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switch (timer_a.mode & 0xc0)
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{
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case 0x00:
|
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timer_a.prescale = 0;
|
||
break;
|
||
case 0x40:
|
||
timer_a.prescale = 8;
|
||
break;
|
||
case 0x80:
|
||
timer_a.prescale = timer_a.tcspr & 0x0f;
|
||
break;
|
||
case 0xc0:
|
||
timer_a.prescale = 32;
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
timer_a.prescale = timer_a.tcspr;
|
||
}
|
||
timer_a.count--;
|
||
if (timer_a.count < 0)
|
||
{
|
||
timer_a.count = timer_a.reload;
|
||
if (timer_a.ic & 7)
|
||
{
|
||
if (A24)
|
||
mem_put_qi (0x6c, timer_a.ic | 0x08);
|
||
else
|
||
mem_put_qi (0x56, timer_a.ic | 0x08);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if (regs.r_flags & FLAGBIT_I /* interrupts enabled */
|
||
&& timer_a.ic & 0x08 /* timer A interrupt triggered */
|
||
&& (timer_a.ic & 0x07) > ((regs.r_flags >> 12) & 0x07))
|
||
{
|
||
if (A24)
|
||
trigger_peripheral_interrupt (12, 0x06c);
|
||
else
|
||
trigger_peripheral_interrupt (22, 0x056);
|
||
}
|
||
}
|
||
#endif
|