root / prex-0.9.0 / sys / kern / sysent.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005-2009 Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * sysent.c - system call switch table.
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32 | */
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33 | |||
34 | #include <kernel.h> |
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35 | #include <thread.h> |
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36 | #include <timer.h> |
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37 | #include <vm.h> |
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38 | #include <task.h> |
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39 | #include <exception.h> |
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40 | #include <ipc.h> |
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41 | #include <device.h> |
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42 | #include <sync.h> |
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43 | #include <system.h> |
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44 | |||
45 | typedef register_t (*sysfn_t)(register_t, register_t, register_t, register_t);
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46 | |||
47 | #ifdef DEBUG
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48 | static void strace_entry(register_t, register_t, register_t, register_t, |
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49 | register_t); |
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50 | static void strace_return(register_t, register_t); |
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51 | #endif
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52 | |||
53 | struct sysent {
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54 | #ifdef DEBUG
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55 | int sy_narg; /* number of arguments */ |
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56 | char *sy_name; /* name string */ |
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57 | #endif
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58 | sysfn_t sy_call; /* handler */
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59 | }; |
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60 | |||
61 | /*
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62 | * Sysent initialization macros.
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63 | *
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64 | * Initialization macro for system calls which take their args
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65 | * in the C style. In order to reduce the memory space, we
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66 | * store the syscall name and its argument count only when
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67 | * DEBUG is defined.
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68 | *
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69 | */
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70 | #ifdef DEBUG
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71 | #define SYSENT(n, fn) {n, __STRING(fn), (sysfn_t)(fn)}
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72 | #else
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73 | #define SYSENT(n, fn) {(sysfn_t)(fn)}
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74 | #endif
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75 | |||
76 | /*
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77 | * This table is the switch used to transfer to the
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78 | * appropriate routine for processing a system call.
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79 | * The first element must be exception_return because
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80 | * it requires special handling in HAL code.
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81 | */
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82 | static const struct sysent sysent[] = { |
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83 | /* 0 */ SYSENT(0, exception_return), |
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84 | /* 1 */ SYSENT(1, exception_setup), |
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85 | /* 2 */ SYSENT(2, exception_raise), |
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86 | /* 3 */ SYSENT(1, exception_wait), |
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87 | /* 4 */ SYSENT(3, task_create), |
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88 | /* 5 */ SYSENT(1, task_terminate), |
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89 | /* 6 */ SYSENT(0, task_self), |
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90 | /* 7 */ SYSENT(1, task_suspend), |
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91 | /* 8 */ SYSENT(1, task_resume), |
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92 | /* 9 */ SYSENT(2, task_setname), |
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93 | /* 10 */ SYSENT(2, task_setcap), |
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94 | /* 11 */ SYSENT(2, task_chkcap), |
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95 | /* 12 */ SYSENT(2, thread_create), |
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96 | /* 13 */ SYSENT(1, thread_terminate), |
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97 | /* 14 */ SYSENT(3, thread_load), |
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98 | /* 15 */ SYSENT(0, thread_self), |
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99 | /* 16 */ SYSENT(0, thread_yield), |
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100 | /* 17 */ SYSENT(1, thread_suspend), |
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101 | /* 18 */ SYSENT(1, thread_resume), |
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102 | /* 19 */ SYSENT(3, thread_schedparam), |
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103 | /* 20 */ SYSENT(4, vm_allocate), |
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104 | /* 21 */ SYSENT(2, vm_free), |
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105 | /* 22 */ SYSENT(3, vm_attribute), |
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106 | /* 23 */ SYSENT(4, vm_map), |
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107 | /* 24 */ SYSENT(2, object_create), |
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108 | /* 25 */ SYSENT(1, object_destroy), |
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109 | /* 26 */ SYSENT(2, object_lookup), |
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110 | /* 27 */ SYSENT(3, msg_send), |
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111 | /* 28 */ SYSENT(3, msg_receive), |
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112 | /* 29 */ SYSENT(3, msg_reply), |
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113 | /* 30 */ SYSENT(2, timer_sleep), |
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114 | /* 31 */ SYSENT(2, timer_alarm), |
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115 | /* 32 */ SYSENT(3, timer_periodic), |
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116 | /* 33 */ SYSENT(0, timer_waitperiod), |
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117 | /* 34 */ SYSENT(3, device_open), |
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118 | /* 35 */ SYSENT(1, device_close), |
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119 | /* 36 */ SYSENT(4, device_read), |
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120 | /* 37 */ SYSENT(4, device_write), |
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121 | /* 38 */ SYSENT(3, device_ioctl), |
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122 | /* 39 */ SYSENT(1, mutex_init), |
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123 | /* 40 */ SYSENT(1, mutex_destroy), |
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124 | /* 41 */ SYSENT(1, mutex_lock), |
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125 | /* 42 */ SYSENT(1, mutex_trylock), |
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126 | /* 43 */ SYSENT(1, mutex_unlock), |
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127 | /* 44 */ SYSENT(1, cond_init), |
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128 | /* 45 */ SYSENT(1, cond_destroy), |
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129 | /* 46 */ SYSENT(2, cond_wait), |
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130 | /* 47 */ SYSENT(1, cond_signal), |
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131 | /* 48 */ SYSENT(1, cond_broadcast), |
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132 | /* 49 */ SYSENT(2, sem_init), |
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133 | /* 50 */ SYSENT(1, sem_destroy), |
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134 | /* 51 */ SYSENT(2, sem_wait), |
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135 | /* 52 */ SYSENT(1, sem_trywait), |
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136 | /* 53 */ SYSENT(1, sem_post), |
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137 | /* 54 */ SYSENT(2, sem_getvalue), |
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138 | /* 55 */ SYSENT(1, sys_log), |
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139 | /* 56 */ SYSENT(1, sys_panic), |
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140 | /* 57 */ SYSENT(2, sys_info), |
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141 | /* 58 */ SYSENT(1, sys_time), |
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142 | /* 59 */ SYSENT(2, sys_debug), |
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143 | }; |
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144 | |||
145 | #define NSYSCALL (int)(sizeof(sysent) / sizeof(sysent[0])) |
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146 | |||
147 | |||
148 | /*
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149 | * System call dispatcher.
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150 | */
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151 | register_t |
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152 | syscall_handler(register_t a1, register_t a2, register_t a3, register_t a4, |
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153 | register_t id) |
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154 | { |
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155 | register_t retval = EINVAL; |
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156 | const struct sysent *callp; |
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157 | |||
158 | #ifdef DEBUG
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159 | strace_entry(a1, a2, a3, a4, id); |
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160 | #endif
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161 | |||
162 | if (id < NSYSCALL) {
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163 | callp = &sysent[id]; |
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164 | retval = (*callp->sy_call)(a1, a2, a3, a4); |
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165 | } |
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166 | |||
167 | #ifdef DEBUG
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168 | strace_return(retval, id); |
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169 | #endif
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170 | return retval;
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171 | } |
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172 | |||
173 | #ifdef DEBUG
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174 | /*
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175 | * Show syscall info if the task is being traced.
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176 | */
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177 | static void |
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178 | strace_entry(register_t a1, register_t a2, register_t a3, register_t a4, |
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179 | register_t id) |
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180 | { |
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181 | const struct sysent *callp; |
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182 | |||
183 | if (curtask->flags & TF_TRACE) {
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184 | if (id >= NSYSCALL) {
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185 | printf("%s: OUT OF RANGE (%d)\n",
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186 | curtask->name, id); |
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187 | return;
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188 | } |
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189 | |||
190 | callp = &sysent[id]; |
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191 | |||
192 | printf("%s: %s(", curtask->name, callp->sy_name);
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193 | switch (callp->sy_narg) {
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194 | case 0: |
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195 | printf(")\n");
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196 | break;
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197 | case 1: |
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198 | printf("0x%08x)\n", a1);
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199 | break;
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200 | case 2: |
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201 | printf("0x%08x, 0x%08x)\n", a1, a2);
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202 | break;
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203 | case 3: |
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204 | printf("0x%08x, 0x%08x, 0x%08x)\n",
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205 | a1, a2, a3); |
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206 | break;
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207 | case 4: |
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208 | printf("0x%08x, 0x%08x, 0x%08x, 0x%08x)\n",
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209 | a1, a2, a3, a4); |
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210 | break;
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211 | } |
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212 | } |
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213 | } |
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214 | |||
215 | /*
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216 | * Show status if syscall is failed.
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217 | *
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218 | * We ignore the return code for the function which does
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219 | * not have any arguments, although timer_waitperiod()
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220 | * has valid return code...
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221 | */
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222 | static void |
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223 | strace_return(register_t retval, register_t id) |
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224 | { |
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225 | const struct sysent *callp; |
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226 | |||
227 | if (curtask->flags & TF_TRACE) {
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228 | if (id >= NSYSCALL)
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229 | return;
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230 | callp = &sysent[id]; |
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231 | if (callp->sy_narg != 0 && retval != 0) |
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232 | printf("%s: !!! %s() = 0x%08x\n",
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233 | curtask->name, callp->sy_name, retval); |
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234 | } |
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235 | } |
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236 | #endif /* !DEBUG */ |