aboutsummaryrefslogtreecommitdiff
path: root/sim/m68hc11/emulos.c
blob: bb9f27b418cfcb18fe3272caec7ddfc223cfaf60 (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
/* emulos.c -- Small OS emulation
   Copyright 1999, 2000 Free Software Foundation, Inc.
   Written by Stephane Carrez (stcarrez@worldnet.fr)

This file is part of GDB, GAS, and the GNU binutils.

GDB, GAS, and the GNU binutils are free software; you can redistribute
them and/or modify them under the terms of the GNU General Public
License as published by the Free Software Foundation; either version
1, or (at your option) any later version.

GDB, GAS, and the GNU binutils are distributed in the hope that they
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 file; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "sim-main.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifndef WIN32
#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;

void
emul_bench (struct _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

void
emul_write(struct _sim_cpu* state)
{
  int addr = cpu_get_x (state) & 0x0FFFF;
  int size = cpu_get_d (state) & 0x0FFFF;

  if (addr + size > 0x0FFFF) {
    size = 0x0FFFF - addr;
  }
  state->cpu_running = 0;
  while (size)
    {
      uint8 val = memory_read8 (state, addr);
        
      write(0, &val, 1);
      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.  */
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 *proc)
{
  proc->cpu_current_cycle = 8;
  switch (code)
    {
    case 0x0:
      break;

      /* 0xCD 0x01 */
    case 0x01:
      emul_write (proc);
      break;

      /* 0xCD 0x02 */
    case 0x02:
      break;

      /* 0xCD 0x03 */
    case 0x03:
      emul_exit (proc);
      break;

      /* 0xCD 0x04 */
    case 0x04:
#ifndef WIN32
      emul_bench (proc);
#endif
      break;
        
    default:
      break;
    }
}