kernel/generic/src/syscall/syscall.c

   1 /*
   2  * Copyright (c) 2005 Martin Decky
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup generic
  30  * @{
  31  */
  32
  33 /**
  34  * @file
  35  * @brief       Syscall table and syscall wrappers.
  36  */
  37
  38 #include <syscall/syscall.h>
  39 #include <proc/thread.h>
  40 #include <proc/task.h>
  41 #include <mm/as.h>
  42 #include <print.h>
  43 #include <putchar.h>
  44 #include <errno.h>
  45 #include <arch.h>
  46 #include <debug.h>
  47 #include <ipc/sysipc.h>
  48 #include <synch/futex.h>
  49 #include <ddi/ddi.h>
  50 #include <security/cap.h>
  51 #include <syscall/copy.h>
  52 #include <sysinfo/sysinfo.h>
  53 #include <console/console.h>
  54 #include <console/klog.h>
  55
  56 /** Print using kernel facility
  57  *
  58  * Some simulators can print only through kernel. Userspace can use
  59  * this syscall to facilitate it.
  60  */
  61 static unative_t sys_io(int fd, const void * buf, size_t count)
  62 {
  63         size_t i;
  64         char *data;
  65         int rc;
  66
  67         if (count > PAGE_SIZE)
  68                 return ELIMIT;
  69
  70         data = malloc(count, 0);
  71         if (!data)
  72                 return ENOMEM;
  73
  74         rc = copy_from_uspace(data, buf, count);
  75         if (rc) {
  76                 free(data);
  77                 return rc;
  78         }
  79
  80         for (i = 0; i < count; i++)
  81                 putchar(data[i]);
  82         free(data);
  83
  84         return count;
  85 }
  86
  87 /** Tell kernel to get keyboard/console access again */
  88 static unative_t sys_debug_enable_console(void)
  89 {
  90         arch_grab_console();
  91         return 0;
  92 }
  93
  94 /** Dispatch system call */
  95 unative_t syscall_handler(unative_t a1, unative_t a2, unative_t a3,
  96                          unative_t a4, unative_t id)
  97 {
  98         unative_t rc;
  99
 100         if (id < SYSCALL_END)
 101                 rc = syscall_table[id](a1,a2,a3,a4);
 102         else {
 103                 klog_printf("TASK %lld: Unknown syscall id %d",TASK->taskid,id);
 104                 task_kill(TASK->taskid);
 105                 thread_exit();
 106         }
 107
 108         if (THREAD->interrupted)
 109                 thread_exit();
 110
 111         return rc;
 112 }
 113
 114 syshandler_t syscall_table[SYSCALL_END] = {
 115         sys_io,
 116         sys_tls_set,
 117
 118         /* Thread and task related syscalls. */
 119         sys_thread_create,
 120         sys_thread_exit,
 121         sys_task_get_id,
 122
 123         /* Synchronization related syscalls. */
 124         sys_futex_sleep_timeout,
 125         sys_futex_wakeup,
 126
 127         /* Address space related syscalls. */
 128         sys_as_area_create,
 129         sys_as_area_resize,
 130         sys_as_area_destroy,
 131
 132         /* IPC related syscalls. */
 133         sys_ipc_call_sync_fast,
 134         sys_ipc_call_sync,
 135         sys_ipc_call_async_fast,
 136         sys_ipc_call_async,
 137         sys_ipc_answer_fast,
 138         sys_ipc_answer,
 139         sys_ipc_forward_fast,
 140         sys_ipc_wait_for_call,
 141         sys_ipc_hangup,
 142         sys_ipc_register_irq,
 143         sys_ipc_unregister_irq,
 144
 145         /* Capabilities related syscalls. */
 146         sys_cap_grant,
 147         sys_cap_revoke,
 148
 149         /* DDI related syscalls. */
 150         sys_physmem_map,
 151         sys_iospace_enable,
 152         sys_preempt_control,
 153
 154         /* Sysinfo syscalls */
 155         sys_sysinfo_valid,
 156         sys_sysinfo_value,
 157
 158         /* Debug calls */
 159         sys_debug_enable_console
 160 };
 161
 162 /** @}
 163  */