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662 decky 1
/*
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 * Copyright (c) 2005 Martin Decky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup generic
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 * @{
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 */
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/**
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 * @file
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 * @brief	Syscall table and syscall wrappers.
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 */
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#include <syscall/syscall.h>
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#include <proc/thread.h>
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#include <proc/task.h>
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#include <mm/as.h>
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#include <print.h>
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#include <putchar.h>
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#include <errno.h>
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#include <arch.h>
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#include <debug.h>
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#include <ipc/sysipc.h>
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#include <synch/futex.h>
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#include <ddi/ddi.h>
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#include <security/cap.h>
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#include <syscall/copy.h>
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#include <sysinfo/sysinfo.h>
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#include <console/console.h>
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#include <console/klog.h>
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#include <udebug/udebug.h>
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/** Print using kernel facility
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 *
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 * Some simulators can print only through kernel. Userspace can use
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 * this syscall to facilitate it.
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 */
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static unative_t sys_io(int fd, const void * buf, size_t count) 
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{
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	size_t i;
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	char *data;
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	int rc;
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	if (count > PAGE_SIZE)
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		return ELIMIT;
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	data = (char *) malloc(count, 0);
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	if (!data)
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		return ENOMEM;
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	rc = copy_from_uspace(data, buf, count);
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	if (rc) {
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		free(data);
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		return rc;
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	}
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	for (i = 0; i < count; i++)
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		putchar(data[i]);
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	free(data);
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	return count;
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}
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/** Tell kernel to get keyboard/console access again */
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static unative_t sys_debug_enable_console(void)
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{
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	arch_grab_console();
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	return 0;
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}
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/** Dispatch system call */
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unative_t syscall_handler(unative_t a1, unative_t a2, unative_t a3,
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    unative_t a4, unative_t a5, unative_t a6, unative_t id)
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{
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	unative_t rc;
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	istate_t fake_state;
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	THREAD->udebug.uspace_state = &fake_state;
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	udebug_syscall_event(a1, a2, a3, a4, a5, a6, id, 0, false);
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	if (id < SYSCALL_END) {	
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		udebug_stoppable_begin();
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		rc = syscall_table[id](a1, a2, a3, a4, a5, a6);
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	} else {
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		klog_printf("TASK %llu: Unknown syscall id %llx", TASK->taskid,
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		    id);
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		task_kill(TASK->taskid);
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		thread_exit();
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	}
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	if (THREAD->interrupted)
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		thread_exit();
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	udebug_syscall_event(a1, a2, a3, a4, a5, a6, id, rc, true);
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	udebug_stoppable_end();
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	THREAD->udebug.uspace_state = NULL;
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	return rc;
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}
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syshandler_t syscall_table[SYSCALL_END] = {
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	(syshandler_t) sys_io,
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	(syshandler_t) sys_tls_set,
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	/* Thread and task related syscalls. */
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	(syshandler_t) sys_thread_create,
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	(syshandler_t) sys_thread_exit,
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	(syshandler_t) sys_thread_get_id,
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	(syshandler_t) sys_task_get_id,
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	/* Synchronization related syscalls. */
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	(syshandler_t) sys_futex_sleep_timeout,
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	(syshandler_t) sys_futex_wakeup,
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	/* Address space related syscalls. */
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	(syshandler_t) sys_as_area_create,
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	(syshandler_t) sys_as_area_resize,
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	(syshandler_t) sys_as_area_destroy,
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	/* IPC related syscalls. */
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	(syshandler_t) sys_ipc_call_sync_fast,
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	(syshandler_t) sys_ipc_call_sync_slow,
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	(syshandler_t) sys_ipc_call_async_fast,
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	(syshandler_t) sys_ipc_call_async_slow,
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	(syshandler_t) sys_ipc_answer_fast,
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	(syshandler_t) sys_ipc_answer_slow,
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	(syshandler_t) sys_ipc_forward_fast,
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	(syshandler_t) sys_ipc_wait_for_call,
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	(syshandler_t) sys_ipc_hangup,
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	(syshandler_t) sys_ipc_register_irq,
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	(syshandler_t) sys_ipc_unregister_irq,
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	/* Capabilities related syscalls. */
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	(syshandler_t) sys_cap_grant,
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	(syshandler_t) sys_cap_revoke,
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	/* DDI related syscalls. */
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	(syshandler_t) sys_physmem_map,
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	(syshandler_t) sys_iospace_enable,
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	(syshandler_t) sys_preempt_control,
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	/* Sysinfo syscalls */
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	(syshandler_t) sys_sysinfo_valid,
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	(syshandler_t) sys_sysinfo_value,
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	/* Debug calls */
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	(syshandler_t) sys_debug_enable_console,
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	(syshandler_t) sys_ipc_connect_kbox
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};
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/** @}
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 */