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6df01ab8ab
The defs.h header will take care of including the various config.h headers. For now, it's just config.h, but we'll add more when we integrate gnulib in. This header should be used instead of config.h, and should be the first include in every .c file. We won't rely on the old behavior where we expected files to include the port's sim-main.h which then includes the common sim-basics.h which then includes config.h. We have a ton of code that includes things before sim-main.h, and it sometimes needs to be that way. Creating a dedicated header avoids the ordering mess and implicit inclusion that shows up otherwise.
167 lines
3.7 KiB
C
167 lines
3.7 KiB
C
/* emulos.c -- Small OS emulation
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Copyright 1999-2021 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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/* This must come before any other includes. */
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#include "defs.h"
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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 <errno.h>
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#include <stdio.h>
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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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if (write (0, &val, 1) != 1)
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printf ("write failed: %s\n", strerror (errno));
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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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