aboutsummaryrefslogtreecommitdiff
path: root/sim/m68hc11/emulos.c
blob: 50d275346347762ff5bce174402e884f5cecf591 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/* 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;
    }
}