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/*
* AVR emulator
* The device emulator subprocess
*
* Copyright (C) 2007 Michael Buesch <mb@bu3sch.de>
*
* 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 2
* 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.
*/
#include "devprocess.h"
#include "hardware.h"
#include "cpu.h"
#include <signal.h>
#include <errno.h>
/* Global pointer to the device instance from within the device process. */
struct avremu_device_instance *avremu_dev;
static void device_cleanup(void)
{
cpu_exit();
dump_cpu(stdout);
avr_do_cleanup();
}
static void __attribute__((noreturn)) device_shutdown(int error)
{
device_cleanup();
sendnotify_to_host(avremu_dev, HOSTMSG_EXIT);
exit(error >= 0 ? error : -error);
}
static void device_signal_handler(int signr)
{
switch (signr) {
case SIGSEGV:
fprintf(stderr, "Segmentation fault\n");
if (CHECK(1))
fprintf(stderr, "This is probably a bug in the emulator.\n");
else
fprintf(stderr, "This is either a bug in the running AVR "
"program or in the emulator software.\n");
device_shutdown(1);
break;
case SIGTERM:
case SIGINT:
printf("Emulated device shutting down...\n");
device_shutdown(0);
break;
default:
fprintf(stderr, "Device caught unknown signal %d\n", signr);
device_shutdown(ENOSYS);
}
}
static int device_handle_msg_from_host(struct avrmsg_to_device *msg)
{
char *data;
size_t size;
int err;
ipc_result_t result;
//FIXME we should probably try to drain the buffer on error instead of exiting.
switch (msg->msg) {
case DEVMSG_LOADFLASH:
size = msg->size;
data = avr_malloc(size);
if (!data) {
ipc_send_result(&avremu_dev->msg_from_host, -ENOMEM);
return 0;
}
ipc_send_result(&avremu_dev->msg_from_host, 0);
err = ipc_payload_receive(&avremu_dev->msg_from_host, data, size);
if (err) {
ipc_send_result(&avremu_dev->msg_from_host, err);
free(data);
return 0;
}
result = cpu_initialize(data, size);
free(data);
ipc_send_result(&avremu_dev->msg_from_host, result);
if (!result)
printf("CPU initialized\n");
break;
case DEVMSG_RESET:
result = cpu_reset();
ipc_send_result(&avremu_dev->msg_from_host, result);
if (!result)
printf("CPU reset\n");
break;
}
return 0;
}
int avr_device_process_run(struct avremu_device_instance *dev)
{
struct sigaction sa;
int err;
struct avrmsg_to_device msg;
sigset_t blockset;
avremu_dev = dev;
sa.sa_handler = device_signal_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGSEGV, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
/* Block these signals while processing messages. */
sigemptyset(&blockset);
sigaddset(&blockset, SIGTERM);
sigaddset(&blockset, SIGINT);
err = avr_do_setup(dev->type);
if (err)
return err;
err = sendnotify_to_host(dev, HOSTMSG_READY);
if (err)
return -EIO;
while (1) {
err = pollmsg_from_host(dev, &msg);
if (err == 0)
continue;
if (unlikely(err < 0)) {
fprintf(stderr, "Device message RX failed %d\n", err);
err = -EIO;
goto error;
}
pthread_sigmask(SIG_BLOCK, &blockset, NULL);
err = device_handle_msg_from_host(&msg);
pthread_sigmask(SIG_UNBLOCK, &blockset, NULL);
if (unlikely(err))
goto error;
}
return ENOTTY;
error:
device_cleanup();
return err;
}
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