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  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. /**
  30.  * @file    syscall.c
  31.  * @brief   Syscall table and syscall wrappers.
  32.  */
  33.  
  34. #include <syscall/syscall.h>
  35. #include <proc/thread.h>
  36. #include <proc/task.h>
  37. #include <mm/as.h>
  38. #include <print.h>
  39. #include <putchar.h>
  40. #include <errno.h>
  41. #include <arch.h>
  42. #include <debug.h>
  43. #include <ipc/sysipc.h>
  44. #include <synch/futex.h>
  45. #include <ddi/ddi.h>
  46. #include <security/cap.h>
  47. #include <syscall/copy.h>
  48. #include <sysinfo/sysinfo.h>
  49. #include <console/console.h>
  50.  
  51. /** Print using kernel facility
  52.  *
  53.  * Some simulators can print only through kernel. Userspace can use
  54.  * this syscall to facilitate it.
  55.  */
  56. static __native sys_io(int fd, const void * buf, size_t count)
  57. {
  58.     size_t i;
  59.     char *data;
  60.     int rc;
  61.  
  62.     if (count > PAGE_SIZE)
  63.         return ELIMIT;
  64.  
  65.     data = malloc(count, 0);
  66.     if (!data)
  67.         return ENOMEM;
  68.    
  69.     rc = copy_from_uspace(data, buf, count);
  70.     if (rc) {
  71.         free(data);
  72.         return rc;
  73.     }
  74.  
  75.     for (i = 0; i < count; i++)
  76.         putchar(data[i]);
  77.     free(data);
  78.    
  79.     return count;
  80. }
  81.  
  82. /** Tell kernel to get keyboard/console access again */
  83. static __native sys_debug_enable_console(void)
  84. {
  85.     arch_grab_console();
  86.     return 0;
  87. }
  88.  
  89. /** Dispatch system call */
  90. __native syscall_handler(__native a1, __native a2, __native a3,
  91.              __native a4, __native id)
  92. {
  93.     __native rc;
  94.     ipl_t ipl;
  95.     bool exit = false;
  96.  
  97.     if (id < SYSCALL_END)
  98.         rc = syscall_table[id](a1,a2,a3,a4);
  99.     else
  100.         panic("Undefined syscall %d", id);
  101.        
  102.     ipl = interrupts_disable();
  103.     spinlock_lock(&THREAD->lock);
  104.     if (THREAD->interrupted)
  105.         exit = true;
  106.     spinlock_unlock(&THREAD->lock);
  107.     interrupts_restore(ipl);
  108.    
  109.     if (exit)
  110.         thread_exit();
  111.    
  112.     return rc;
  113. }
  114.  
  115. syshandler_t syscall_table[SYSCALL_END] = {
  116.     sys_io,
  117.     sys_tls_set,
  118.    
  119.     /* Thread and task related syscalls. */
  120.     sys_thread_create,
  121.     sys_thread_exit,
  122.     sys_task_get_id,
  123.    
  124.     /* Synchronization related syscalls. */
  125.     sys_futex_sleep_timeout,
  126.     sys_futex_wakeup,
  127.    
  128.     /* Address space related syscalls. */
  129.     sys_as_area_create,
  130.     sys_as_area_resize,
  131.     sys_as_area_destroy,
  132.  
  133.     /* IPC related syscalls. */
  134.     sys_ipc_call_sync_fast,
  135.     sys_ipc_call_sync,
  136.     sys_ipc_call_async_fast,
  137.     sys_ipc_call_async,
  138.     sys_ipc_answer_fast,
  139.     sys_ipc_answer,
  140.     sys_ipc_forward_fast,
  141.     sys_ipc_wait_for_call,
  142.     sys_ipc_hangup,
  143.     sys_ipc_register_irq,
  144.     sys_ipc_unregister_irq,
  145.  
  146.     /* Capabilities related syscalls. */
  147.     sys_cap_grant,
  148.     sys_cap_revoke,
  149.  
  150.     /* DDI related syscalls. */
  151.     sys_physmem_map,
  152.     sys_iospace_enable,
  153.     sys_preempt_control,
  154.    
  155.     /* Sysinfo syscalls */
  156.     sys_sysinfo_valid,
  157.     sys_sysinfo_value,
  158.    
  159.     /* Debug calls */
  160.     sys_debug_enable_console
  161. };
  162.