sim/m68hc11/emulos.c

   1 /* emulos.c -- Small OS emulation
   2    Copyright 1999-2020 Free Software Foundation, Inc.
   3    Written by Stephane Carrez (stcarrez@worldnet.fr)
   4
   5 This file is part of GDB, GAS, and the GNU binutils.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "sim-main.h"
  21 #ifdef HAVE_UNISTD_H
  22 #include <unistd.h>
  23 #endif
  24
  25 #ifndef WIN32
  26 #include <sys/types.h>
  27 #include <sys/time.h>
  28
  29 /* This file emulates some OS system calls.
  30    It's basically used to give access to the host OS facilities
  31    like: stdin, stdout, files, time of day.  */
  32 static int bench_mode = -1;
  33 static struct timeval bench_start;
  34 static struct timeval bench_stop;
  35
  36 static void
  37 emul_bench (sim_cpu *cpu)
  38 {
  39   int op;
  40
  41   op = cpu_get_d (cpu);
  42   switch (op)
  43     {
  44     case 0:
  45       bench_mode = 0;
  46       gettimeofday (&bench_start, 0);
  47       break;
  48
  49     case 1:
  50       gettimeofday (&bench_stop, 0);
  51       if (bench_mode != 0)
  52         printf ("bench start not called...\n");
  53       bench_mode = 1;
  54       break;
  55
  56     case 2:
  57       {
  58         int sz = 0;
  59         int addr = cpu_get_x (cpu);
  60         double t_start, t_stop, t;
  61         char buf[1024];
  62
  63         op = cpu_get_y (cpu);
  64         t_start = (double) (bench_start.tv_sec) * 1.0e6;
  65         t_start += (double) (bench_start.tv_usec);
  66         t_stop  = (double) (bench_stop.tv_sec) * 1.0e6;
  67         t_stop  += (double) (bench_stop.tv_usec);
  68
  69         while (sz < 1024)
  70           {
  71             buf[sz] = memory_read8 (cpu, addr);
  72             if (buf[sz] == 0)
  73               break;
  74
  75             sz ++;
  76             addr++;
  77           }
  78         buf[1023] = 0;
  79
  80         if (bench_mode != 1)
  81           printf ("bench_stop not called");
  82
  83         bench_mode = -1;
  84         t = t_stop - t_start;
  85         printf ("%-40.40s [%6d] %3.3f us\n", buf,
  86                 op, t / (double) (op));
  87         break;
  88       }
  89     }
  90 }
  91 #endif
  92
  93 static void
  94 emul_write (sim_cpu *cpu)
  95 {
  96   int addr = cpu_get_x (cpu) & 0x0FFFF;
  97   int size = cpu_get_d (cpu) & 0x0FFFF;
  98
  99   if (addr + size > 0x0FFFF) {
 100     size = 0x0FFFF - addr;
 101   }
 102   cpu->cpu_running = 0;
 103   while (size)
 104     {
 105       uint8 val = memory_read8 (cpu, addr);
 106
 107       write(0, &val, 1);
 108       addr ++;
 109       size--;
 110     }
 111 }
 112
 113 /* emul_exit () is used by the default startup code of GCC to implement
 114    the exit ().  For a real target, this will create an ILLEGAL fault.
 115    But doing an exit () on a real target is really a non-sense.
 116    exit () is important for the validation of GCC.  The exit status
 117    is passed in 'D' register.  */
 118 static void
 119 emul_exit (sim_cpu *cpu)
 120 {
 121   sim_engine_halt (CPU_STATE (cpu), cpu,
 122                    NULL, NULL_CIA, sim_exited,
 123                    cpu_get_d (cpu));
 124 }
 125
 126 void
 127 emul_os (int code, sim_cpu *cpu)
 128 {
 129   cpu->cpu_current_cycle = 8;
 130   switch (code)
 131     {
 132     case 0x0:
 133       break;
 134
 135       /* 0xCD 0x01 */
 136     case 0x01:
 137       emul_write (cpu);
 138       break;
 139
 140       /* 0xCD 0x02 */
 141     case 0x02:
 142       break;
 143
 144       /* 0xCD 0x03 */
 145     case 0x03:
 146       emul_exit (cpu);
 147       break;
 148
 149       /* 0xCD 0x04 */
 150     case 0x04:
 151 #ifndef WIN32
 152       emul_bench (cpu);
 153 #endif
 154       break;
 155
 156     default:
 157       break;
 158     }
 159 }
 160