binutils-gdb/sim/m32c/mem.c

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/* mem.c --- memory for M32C simulator.
Copyright (C) 2005-2013 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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#endif
#include "mem.h"
#include "cpu.h"
#include "syscalls.h"
#include "misc.h"
#ifdef TIMER_A
#include "int.h"
#include "timer_a.h"
#endif
#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];
#ifdef HAVE_TERMIOS_H
int m32c_console_ifd = 0;
#endif
int m32c_console_ofd = 1;
#ifdef HAVE_TERMIOS_H
int m32c_use_raw_console = 0;
#endif
#ifdef TIMER_A
Timer_A timer_a;
#endif
/* [ 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 (mem_counters, 0, sizeof (mem_counters));
}
static unsigned char *
mem_ptr (address)
{
static int recursing = 0;
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 && !recursing)
{
recursing = 1;
put_reg (pc, m32c_opcode_pc);
printf ("NULL pointer dereference at pc=0x%x\n", get_reg (pc));
step_result = M32C_MAKE_HIT_BREAK ();
#if 0
/* This code can be re-enabled to help diagnose NULL pointer
bugs that aren't debuggable in GDB. */
m32c_dump_all_registers ();
exit (1);
#endif
}
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()
extern int m32c_disassemble;
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 <20> ", "\033[0m <20> ", "\033[0m <20> " };
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;
#ifdef TIMER_A
/* M32C Timer A */
case 0x346: /* TA0low */
timer_a.count = (timer_a.count & 0xff00) | value;
timer_a.reload = timer_a.count;
break;
case 0x347: /* TA0high */
timer_a.count = (timer_a.count & 0x00ff) | (value << 8);
timer_a.reload = timer_a.count;
break;
case 0x340: /* TABSR */
timer_a.bsr = value;
break;
case 0x356: /* TA0MR */
timer_a.mode = value;
break;
case 0x35f: /* TCSPR */
timer_a.tcspr = value;
break;
case 0x006c: /* TA0IC */
timer_a.ic = value;
break;
/* R8C Timer RA */
case 0x100: /* TRACR */
timer_a.bsr = value;
break;
case 0x102: /* TRAMR */
timer_a.mode = value;
break;
case 0x104: /* TRA */
timer_a.count = value;
timer_a.reload = value;
break;
case 0x103: /* TRAPRE */
timer_a.tcspr = value;
break;
case 0x0056: /* TA0IC */
timer_a.ic = value;
break;
#endif
case 0x2ea: /* m32c uart1tx */
case 0x3aa: /* m16c uart1tx */
{
static int pending_exit = 0;
if (value == 0)
{
if (pending_exit)
{
step_result = M32C_MAKE_EXITED (value);
return;
}
pending_exit = 1;
}
else
{
write (m32c_console_ofd, &value, 1);
}
}
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, const void *bufptr, int nbytes)
{
S ("<=");
if (enable_counting)
mem_counters[1][1] += nbytes;
while (nbytes--)
mem_put_byte (address++, *(const unsigned char *) bufptr++);
E ();
}
unsigned char
mem_get_pc ()
{
unsigned char *m = mem_ptr (regs.r_pc & membus_mask);
COUNT (0, 0);
return *m;
}
#ifdef HAVE_TERMIOS_H
static int console_raw = 0;
static struct termios oattr;
static int
stdin_ready ()
{
fd_set ifd;
int n;
struct timeval t;
t.tv_sec = 0;
t.tv_usec = 0;
FD_ZERO (&ifd);
FD_SET (m32c_console_ifd, &ifd);
n = select (1, &ifd, 0, 0, &t);
return n > 0;
}
void
m32c_sim_restore_console ()
{
if (console_raw)
tcsetattr (m32c_console_ifd, TCSANOW, &oattr);
console_raw = 0;
}
#endif
static unsigned char
mem_get_byte (int address)
{
unsigned char *m;
address &= membus_mask;
m = mem_ptr (address);
switch (address)
{
#ifdef HAVE_TERMIOS_H
case 0x2ed: /* m32c uart1c1 */
case 0x3ad: /* m16c uart1c1 */
if (!console_raw && m32c_use_raw_console)
{
struct termios attr;
tcgetattr (m32c_console_ifd, &attr);
tcgetattr (m32c_console_ifd, &oattr);
/* We want each key to be sent as the user presses them. */
attr.c_lflag &= ~(ICANON | ECHO | ECHOE);
tcsetattr (m32c_console_ifd, TCSANOW, &attr);
console_raw = 1;
atexit (m32c_sim_restore_console);
}
if (stdin_ready ())
return 0x02; /* tx empty and rx full */
else
return 0x0a; /* transmitter empty */
case 0x2ee: /* m32c uart1 rx */
{
char c;
read (m32c_console_ifd, &c, 1);
if (m32c_console_ifd == 0 && c == 3) /* Ctrl-C */
{
printf ("Ctrl-C!\n");
exit (0);
}
if (m32c_console_ifd != 1)
{
if (isgraph (c))
printf ("\033[31m%c\033[0m", c);
else
printf ("\033[31m%02x\033[0m", c);
}
return c;
}
#endif
#ifdef TIMER_A
case 0x346: /* TA0low */
return timer_a.count & 0xff;
case 0x347: /* TA0high */
return (timer_a.count >> 8) & 0xff;
case 0x104: /* TRA */
return timer_a.count;
#endif
default:
/* In case both cases above are not included. */
;
}
S ("=>");
if (trace)
printf (" %02x", *m);
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;
}
#if TIMER_A
void
update_timer_a ()
{
if (timer_a.bsr & 1)
{
timer_a.prescale--;
if (timer_a.prescale < 0)
{
if (A24)
{
switch (timer_a.mode & 0xc0)
{
case 0x00:
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