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/* emulos.c -- Small OS emulation
Copyright 1999-2023 Free Software Foundation, Inc.
Written by Stephane Carrez (stcarrez@worldnet.fr)
This file is part of GDB, GAS, and the GNU binutils.
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 must come before any other includes. */
#include "defs.h"
#include "sim-main.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "m68hc11-sim.h"
#ifndef WIN32
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
/* This file emulates some OS system calls.
It's basically used to give access to the host OS facilities
like: stdin, stdout, files, time of day. */
static int bench_mode = -1;
static struct timeval bench_start;
static struct timeval bench_stop;
static void
emul_bench (sim_cpu *cpu)
{
int op;
op = cpu_get_d (cpu);
switch (op)
{
case 0:
bench_mode = 0;
gettimeofday (&bench_start, 0);
break;
case 1:
gettimeofday (&bench_stop, 0);
if (bench_mode != 0)
printf ("bench start not called...\n");
bench_mode = 1;
break;
case 2:
{
int sz = 0;
int addr = cpu_get_x (cpu);
double t_start, t_stop, t;
char buf[1024];
op = cpu_get_y (cpu);
t_start = (double) (bench_start.tv_sec) * 1.0e6;
t_start += (double) (bench_start.tv_usec);
t_stop = (double) (bench_stop.tv_sec) * 1.0e6;
t_stop += (double) (bench_stop.tv_usec);
while (sz < 1024)
{
buf[sz] = memory_read8 (cpu, addr);
if (buf[sz] == 0)
break;
sz ++;
addr++;
}
buf[1023] = 0;
if (bench_mode != 1)
printf ("bench_stop not called");
bench_mode = -1;
t = t_stop - t_start;
printf ("%-40.40s [%6d] %3.3f us\n", buf,
op, t / (double) (op));
break;
}
}
}
#endif
static void
emul_write (sim_cpu *cpu)
{
int addr = cpu_get_x (cpu) & 0x0FFFF;
int size = cpu_get_d (cpu) & 0x0FFFF;
if (addr + size > 0x0FFFF) {
size = 0x0FFFF - addr;
}
M68HC11_SIM_CPU (cpu)->cpu_running = 0;
while (size)
{
uint8_t val = memory_read8 (cpu, addr);
if (write (0, &val, 1) != 1)
printf ("write failed: %s\n", strerror (errno));
addr ++;
size--;
}
}
/* emul_exit () is used by the default startup code of GCC to implement
the exit (). For a real target, this will create an ILLEGAL fault.
But doing an exit () on a real target is really a non-sense.
exit () is important for the validation of GCC. The exit status
is passed in 'D' register. */
static void
emul_exit (sim_cpu *cpu)
{
sim_engine_halt (CPU_STATE (cpu), cpu,
NULL, NULL_CIA, sim_exited,
cpu_get_d (cpu));
}
void
emul_os (int code, sim_cpu *cpu)
{
M68HC11_SIM_CPU (cpu)->cpu_current_cycle = 8;
switch (code)
{
case 0x0:
break;
/* 0xCD 0x01 */
case 0x01:
emul_write (cpu);
break;
/* 0xCD 0x02 */
case 0x02:
break;
/* 0xCD 0x03 */
case 0x03:
emul_exit (cpu);
break;
/* 0xCD 0x04 */
case 0x04:
#ifndef WIN32
emul_bench (cpu);
#endif
break;
default:
break;
}
}
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