source: mainline/generic/src/syscall/syscall.c@ 874621f

/*
 * Copyright (C) 2005 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file        syscall.c
 * @brief       Syscall table and syscall wrappers.
 */
 
#include <syscall/syscall.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <mm/as.h>
#include <print.h>
#include <putchar.h>
#include <errno.h>
#include <arch.h>
#include <debug.h>
#include <ipc/sysipc.h>
#include <synch/futex.h>
#include <ddi/ddi.h>
#include <security/cap.h>
#include <syscall/copy.h>
#include <sysinfo/sysinfo.h>
#include <console/console.h>

/** Print using kernel facility
 *
 * Some simulators can print only through kernel. Userspace can use
 * this syscall to facilitate it.
 */
static __native sys_io(int fd, const void * buf, size_t count) 
{
        size_t i;
        char *data;
        int rc;

        if (count > PAGE_SIZE)
                return ELIMIT;

        data = malloc(count, 0);
        if (!data)
                return ENOMEM;
        
        rc = copy_from_uspace(data, buf, count);
        if (rc) {
                free(data);
                return rc;
        }

        for (i = 0; i < count; i++)
                putchar(data[i]);
        free(data);
        
        return count;
}

/** Tell kernel to get keyboard/console access again */
static __native sys_debug_enable_console(void)
{
        arch_grab_console();
        return 0;
}

/** Dispatch system call */
__native syscall_handler(__native a1, __native a2, __native a3,
                         __native a4, __native id)
{
        __native rc;
        ipl_t ipl;
        bool exit = false;

        if (id < SYSCALL_END)
                rc = syscall_table[id](a1,a2,a3,a4);
        else
                panic("Undefined syscall %d", id);
                
        ipl = interrupts_disable();
        spinlock_lock(&THREAD->lock);
        if (THREAD->interrupted)
                exit = true;
        spinlock_unlock(&THREAD->lock);
        interrupts_restore(ipl);
        
        if (exit)
                thread_exit();
        
        return rc;
}

syshandler_t syscall_table[SYSCALL_END] = {
        sys_io,
        sys_tls_set,
        
        /* Thread and task related syscalls. */
        sys_thread_create,
        sys_thread_exit,
        sys_task_get_id,
        
        /* Synchronization related syscalls. */
        sys_futex_sleep_timeout,
        sys_futex_wakeup,
        
        /* Address space related syscalls. */
        sys_as_area_create,
        sys_as_area_resize,
        sys_as_area_destroy,

        /* IPC related syscalls. */
        sys_ipc_call_sync_fast,
        sys_ipc_call_sync,
        sys_ipc_call_async_fast,
        sys_ipc_call_async,
        sys_ipc_answer_fast,
        sys_ipc_answer,
        sys_ipc_forward_fast,
        sys_ipc_wait_for_call,
        sys_ipc_hangup,
        sys_ipc_register_irq,
        sys_ipc_unregister_irq,

        /* Capabilities related syscalls. */
        sys_cap_grant,
        sys_cap_revoke,

        /* DDI related syscalls. */
        sys_physmem_map,
        sys_iospace_enable,
        sys_preempt_control,
        
        /* Sysinfo syscalls */
        sys_sysinfo_valid,
        sys_sysinfo_value,
        
        /* Debug calls */
        sys_debug_enable_console
};