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161 lines
3.6 KiB
C
161 lines
3.6 KiB
C
/* emulos.c -- Small OS emulation
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Copyright 1999-2018 Free Software Foundation, Inc.
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Written by Stephane Carrez (stcarrez@worldnet.fr)
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This file is part of GDB, GAS, and the GNU binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "sim-main.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifndef WIN32
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#include <sys/types.h>
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#include <sys/time.h>
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/* This file emulates some OS system calls.
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It's basically used to give access to the host OS facilities
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like: stdin, stdout, files, time of day. */
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static int bench_mode = -1;
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static struct timeval bench_start;
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static struct timeval bench_stop;
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static void
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emul_bench (sim_cpu *cpu)
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{
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int op;
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op = cpu_get_d (cpu);
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switch (op)
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{
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case 0:
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bench_mode = 0;
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gettimeofday (&bench_start, 0);
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break;
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case 1:
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gettimeofday (&bench_stop, 0);
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if (bench_mode != 0)
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printf ("bench start not called...\n");
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bench_mode = 1;
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break;
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case 2:
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{
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int sz = 0;
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int addr = cpu_get_x (cpu);
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double t_start, t_stop, t;
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char buf[1024];
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op = cpu_get_y (cpu);
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t_start = (double) (bench_start.tv_sec) * 1.0e6;
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t_start += (double) (bench_start.tv_usec);
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t_stop = (double) (bench_stop.tv_sec) * 1.0e6;
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t_stop += (double) (bench_stop.tv_usec);
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while (sz < 1024)
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{
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buf[sz] = memory_read8 (cpu, addr);
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if (buf[sz] == 0)
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break;
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sz ++;
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addr++;
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}
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buf[1023] = 0;
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if (bench_mode != 1)
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printf ("bench_stop not called");
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bench_mode = -1;
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t = t_stop - t_start;
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printf ("%-40.40s [%6d] %3.3f us\n", buf,
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op, t / (double) (op));
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break;
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}
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}
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}
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#endif
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static void
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emul_write (sim_cpu *cpu)
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{
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int addr = cpu_get_x (cpu) & 0x0FFFF;
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int size = cpu_get_d (cpu) & 0x0FFFF;
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if (addr + size > 0x0FFFF) {
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size = 0x0FFFF - addr;
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}
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cpu->cpu_running = 0;
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while (size)
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{
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uint8 val = memory_read8 (cpu, addr);
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write(0, &val, 1);
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addr ++;
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size--;
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}
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}
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/* emul_exit () is used by the default startup code of GCC to implement
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the exit (). For a real target, this will create an ILLEGAL fault.
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But doing an exit () on a real target is really a non-sense.
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exit () is important for the validation of GCC. The exit status
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is passed in 'D' register. */
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static void
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emul_exit (sim_cpu *cpu)
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{
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sim_engine_halt (CPU_STATE (cpu), cpu,
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NULL, NULL_CIA, sim_exited,
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cpu_get_d (cpu));
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}
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void
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emul_os (int code, sim_cpu *cpu)
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{
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cpu->cpu_current_cycle = 8;
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switch (code)
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{
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case 0x0:
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break;
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/* 0xCD 0x01 */
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case 0x01:
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emul_write (cpu);
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break;
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/* 0xCD 0x02 */
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case 0x02:
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break;
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/* 0xCD 0x03 */
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case 0x03:
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emul_exit (cpu);
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break;
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/* 0xCD 0x04 */
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case 0x04:
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#ifndef WIN32
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emul_bench (cpu);
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#endif
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break;
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default:
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break;
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}
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}
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