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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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5 -- S Y S T E M . I N T E R R U P T S --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1998-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNARL is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNARL was developed by the GNARL team at Florida State University. --
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28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This is the NT version of this package
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33
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34 with Ada.Task_Identification;
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35 with Ada.Unchecked_Conversion;
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36
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37 with Interfaces.C;
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38
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39 with System.Storage_Elements;
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40 with System.Task_Primitives.Operations;
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41 with System.Tasking.Utilities;
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42 with System.Tasking.Rendezvous;
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43 with System.Tasking.Initialization;
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44 with System.Interrupt_Management;
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45 with System.Parameters;
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46
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47 package body System.Interrupts is
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48
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49 use Parameters;
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50 use Tasking;
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51 use System.OS_Interface;
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52 use Interfaces.C;
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53
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54 package STPO renames System.Task_Primitives.Operations;
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55 package IMNG renames System.Interrupt_Management;
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56
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57 subtype int is Interfaces.C.int;
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58
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59 function To_System is new Ada.Unchecked_Conversion
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60 (Ada.Task_Identification.Task_Id, Task_Id);
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61
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62 type Handler_Kind is (Unknown, Task_Entry, Protected_Procedure);
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63
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64 type Handler_Desc is record
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65 Kind : Handler_Kind := Unknown;
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66 T : Task_Id;
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67 E : Task_Entry_Index;
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68 H : Parameterless_Handler;
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69 Static : Boolean := False;
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70 end record;
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71
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72 task type Server_Task (Interrupt : Interrupt_ID) is
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73 pragma Interrupt_Priority (System.Interrupt_Priority'Last);
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74 end Server_Task;
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75
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76 type Server_Task_Access is access Server_Task;
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77
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78 Handlers : array (Interrupt_ID) of Task_Id;
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79 Descriptors : array (Interrupt_ID) of Handler_Desc;
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80 Interrupt_Count : array (Interrupt_ID) of Integer := (others => 0);
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81
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82 pragma Volatile_Components (Interrupt_Count);
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83
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84 procedure Attach_Handler
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85 (New_Handler : Parameterless_Handler;
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86 Interrupt : Interrupt_ID;
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87 Static : Boolean;
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88 Restoration : Boolean);
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89 -- This internal procedure is needed to finalize protected objects that
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90 -- contain interrupt handlers.
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91
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92 procedure Signal_Handler (Sig : Interrupt_ID);
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93 pragma Convention (C, Signal_Handler);
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94 -- This procedure is used to handle all the signals
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95
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96 -- Type and Head, Tail of the list containing Registered Interrupt
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97 -- Handlers. These definitions are used to register the handlers
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98 -- specified by the pragma Interrupt_Handler.
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99
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100 --------------------------
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101 -- Handler Registration --
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102 --------------------------
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103
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104 type Registered_Handler;
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105 type R_Link is access all Registered_Handler;
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106
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107 type Registered_Handler is record
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108 H : System.Address := System.Null_Address;
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109 Next : R_Link := null;
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110 end record;
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111
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112 Registered_Handlers : R_Link := null;
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113
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114 function Is_Registered (Handler : Parameterless_Handler) return Boolean;
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115 -- See if the Handler has been "pragma"ed using Interrupt_Handler.
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116 -- Always consider a null handler as registered.
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117
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118 type Handler_Ptr is access procedure (Sig : Interrupt_ID);
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119 pragma Convention (C, Handler_Ptr);
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120
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121 function TISR is new Ada.Unchecked_Conversion (Handler_Ptr, isr_address);
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122
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123 --------------------
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124 -- Signal_Handler --
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125 --------------------
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126
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127 procedure Signal_Handler (Sig : Interrupt_ID) is
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128 Handler : Task_Id renames Handlers (Sig);
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129
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130 begin
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131 if Intr_Attach_Reset and then
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132 intr_attach (int (Sig), TISR (Signal_Handler'Access)) = FUNC_ERR
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133 then
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134 raise Program_Error;
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135 end if;
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136
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137 if Handler /= null then
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138 Interrupt_Count (Sig) := Interrupt_Count (Sig) + 1;
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139 STPO.Wakeup (Handler, Interrupt_Server_Idle_Sleep);
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140 end if;
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141 end Signal_Handler;
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142
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143 -----------------
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144 -- Is_Reserved --
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145 -----------------
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146
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147 function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is
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148 begin
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149 return IMNG.Reserve (IMNG.Interrupt_ID (Interrupt));
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150 end Is_Reserved;
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151
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152 -----------------------
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153 -- Is_Entry_Attached --
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154 -----------------------
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155
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156 function Is_Entry_Attached (Interrupt : Interrupt_ID) return Boolean is
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157 begin
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158 if Is_Reserved (Interrupt) then
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159 raise Program_Error with
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160 "interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved";
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161 end if;
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162
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163 return Descriptors (Interrupt).T /= Null_Task;
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164 end Is_Entry_Attached;
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165
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166 -------------------------
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167 -- Is_Handler_Attached --
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168 -------------------------
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169
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170 function Is_Handler_Attached (Interrupt : Interrupt_ID) return Boolean is
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171 begin
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172 if Is_Reserved (Interrupt) then
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173 raise Program_Error with
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174 "interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved";
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175 else
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176 return Descriptors (Interrupt).Kind /= Unknown;
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177 end if;
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178 end Is_Handler_Attached;
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179
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180 ----------------
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181 -- Is_Ignored --
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182 ----------------
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183
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184 function Is_Ignored (Interrupt : Interrupt_ID) return Boolean is
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185 begin
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186 raise Program_Error;
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187 return False;
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188 end Is_Ignored;
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189
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190 ------------------
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191 -- Unblocked_By --
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192 ------------------
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193
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194 function Unblocked_By (Interrupt : Interrupt_ID) return Task_Id is
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195 begin
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196 raise Program_Error;
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197 return Null_Task;
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198 end Unblocked_By;
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199
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200 ----------------------
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201 -- Ignore_Interrupt --
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202 ----------------------
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203
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204 procedure Ignore_Interrupt (Interrupt : Interrupt_ID) is
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205 begin
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206 raise Program_Error;
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207 end Ignore_Interrupt;
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208
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209 ------------------------
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210 -- Unignore_Interrupt --
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211 ------------------------
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212
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213 procedure Unignore_Interrupt (Interrupt : Interrupt_ID) is
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214 begin
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215 raise Program_Error;
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216 end Unignore_Interrupt;
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217
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218 -------------------------------------
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219 -- Has_Interrupt_Or_Attach_Handler --
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220 -------------------------------------
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221
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222 function Has_Interrupt_Or_Attach_Handler
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223 (Object : access Dynamic_Interrupt_Protection) return Boolean
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224 is
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225 pragma Unreferenced (Object);
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226 begin
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227 return True;
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228 end Has_Interrupt_Or_Attach_Handler;
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229
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230 --------------
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231 -- Finalize --
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232 --------------
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233
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234 procedure Finalize (Object : in out Static_Interrupt_Protection) is
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235 begin
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236 -- ??? loop to be executed only when we're not doing library level
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237 -- finalization, since in this case all interrupt tasks are gone.
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238
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239 for N in reverse Object.Previous_Handlers'Range loop
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240 Attach_Handler
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241 (New_Handler => Object.Previous_Handlers (N).Handler,
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242 Interrupt => Object.Previous_Handlers (N).Interrupt,
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243 Static => Object.Previous_Handlers (N).Static,
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244 Restoration => True);
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245 end loop;
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246
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247 Tasking.Protected_Objects.Entries.Finalize
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248 (Tasking.Protected_Objects.Entries.Protection_Entries (Object));
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249 end Finalize;
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250
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251 -------------------------------------
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252 -- Has_Interrupt_Or_Attach_Handler --
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253 -------------------------------------
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254
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255 function Has_Interrupt_Or_Attach_Handler
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256 (Object : access Static_Interrupt_Protection) return Boolean
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257 is
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258 pragma Unreferenced (Object);
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259 begin
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260 return True;
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261 end Has_Interrupt_Or_Attach_Handler;
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262
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263 ----------------------
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264 -- Install_Handlers --
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265 ----------------------
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266
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267 procedure Install_Handlers
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268 (Object : access Static_Interrupt_Protection;
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269 New_Handlers : New_Handler_Array)
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270 is
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271 begin
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272 for N in New_Handlers'Range loop
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273
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274 -- We need a lock around this ???
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275
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276 Object.Previous_Handlers (N).Interrupt := New_Handlers (N).Interrupt;
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277 Object.Previous_Handlers (N).Static := Descriptors
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278 (New_Handlers (N).Interrupt).Static;
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279
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280 -- We call Exchange_Handler and not directly Interrupt_Manager.
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281 -- Exchange_Handler so we get the Is_Reserved check.
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282
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283 Exchange_Handler
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284 (Old_Handler => Object.Previous_Handlers (N).Handler,
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285 New_Handler => New_Handlers (N).Handler,
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286 Interrupt => New_Handlers (N).Interrupt,
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287 Static => True);
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288 end loop;
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289 end Install_Handlers;
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290
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291 ---------------------------------
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292 -- Install_Restricted_Handlers --
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293 ---------------------------------
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294
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295 procedure Install_Restricted_Handlers
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296 (Prio : Any_Priority;
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297 Handlers : New_Handler_Array)
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298 is
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299 pragma Unreferenced (Prio);
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300 begin
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301 for N in Handlers'Range loop
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302 Attach_Handler (Handlers (N).Handler, Handlers (N).Interrupt, True);
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303 end loop;
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304 end Install_Restricted_Handlers;
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305
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306 ---------------------
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307 -- Current_Handler --
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308 ---------------------
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309
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310 function Current_Handler
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311 (Interrupt : Interrupt_ID) return Parameterless_Handler
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312 is
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313 begin
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314 if Is_Reserved (Interrupt) then
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315 raise Program_Error;
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316 end if;
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317
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318 if Descriptors (Interrupt).Kind = Protected_Procedure then
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319 return Descriptors (Interrupt).H;
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320 else
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321 return null;
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322 end if;
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323 end Current_Handler;
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324
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325 --------------------
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326 -- Attach_Handler --
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327 --------------------
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328
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329 procedure Attach_Handler
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330 (New_Handler : Parameterless_Handler;
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331 Interrupt : Interrupt_ID;
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332 Static : Boolean := False)
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333 is
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334 begin
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335 Attach_Handler (New_Handler, Interrupt, Static, False);
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336 end Attach_Handler;
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337
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338 procedure Attach_Handler
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339 (New_Handler : Parameterless_Handler;
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340 Interrupt : Interrupt_ID;
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341 Static : Boolean;
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342 Restoration : Boolean)
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343 is
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344 New_Task : Server_Task_Access;
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345
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346 begin
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347 if Is_Reserved (Interrupt) then
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348 raise Program_Error;
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349 end if;
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350
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351 if not Restoration and then not Static
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352
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353 -- Tries to overwrite a static Interrupt Handler with dynamic handle
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354
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355 and then
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356 (Descriptors (Interrupt).Static
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357
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358 -- New handler not specified as an Interrupt Handler by a pragma
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359
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360 or else not Is_Registered (New_Handler))
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361 then
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362 raise Program_Error with
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363 "trying to overwrite a static interrupt handler with a " &
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364 "dynamic handler";
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365 end if;
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366
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367 if Handlers (Interrupt) = null then
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368 New_Task := new Server_Task (Interrupt);
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369 Handlers (Interrupt) := To_System (New_Task.all'Identity);
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370 end if;
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371
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372 if intr_attach (int (Interrupt),
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373 TISR (Signal_Handler'Access)) = FUNC_ERR
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374 then
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375 raise Program_Error;
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376 end if;
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377
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378 if New_Handler = null then
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379
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380 -- The null handler means we are detaching the handler
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381
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382 Descriptors (Interrupt) :=
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383 (Kind => Unknown, T => null, E => 0, H => null, Static => False);
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384
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385 else
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386 Descriptors (Interrupt).Kind := Protected_Procedure;
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387 Descriptors (Interrupt).H := New_Handler;
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388 Descriptors (Interrupt).Static := Static;
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389 end if;
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390 end Attach_Handler;
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391
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392 ----------------------
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393 -- Exchange_Handler --
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394 ----------------------
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395
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396 procedure Exchange_Handler
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397 (Old_Handler : out Parameterless_Handler;
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398 New_Handler : Parameterless_Handler;
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399 Interrupt : Interrupt_ID;
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400 Static : Boolean := False)
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401 is
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402 begin
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403 if Is_Reserved (Interrupt) then
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404 raise Program_Error;
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405 end if;
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406
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407 if Descriptors (Interrupt).Kind = Task_Entry then
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408
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409 -- In case we have an Interrupt Entry already installed, raise a
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410 -- program error (propagate it to the caller).
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411
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412 raise Program_Error with "an interrupt is already installed";
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413
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414 else
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415 Old_Handler := Current_Handler (Interrupt);
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416 Attach_Handler (New_Handler, Interrupt, Static);
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417 end if;
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418 end Exchange_Handler;
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419
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420 --------------------
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421 -- Detach_Handler --
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422 --------------------
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423
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424 procedure Detach_Handler
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425 (Interrupt : Interrupt_ID;
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426 Static : Boolean := False)
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427 is
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428 begin
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429 if Is_Reserved (Interrupt) then
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430 raise Program_Error;
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431 end if;
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432
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433 if Descriptors (Interrupt).Kind = Task_Entry then
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434 raise Program_Error with "trying to detach an interrupt entry";
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435 end if;
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436
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437 if not Static and then Descriptors (Interrupt).Static then
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438 raise Program_Error with
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439 "trying to detach a static interrupt handler";
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440 end if;
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441
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442 Descriptors (Interrupt) :=
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443 (Kind => Unknown, T => null, E => 0, H => null, Static => False);
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444
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445 if intr_attach (int (Interrupt), null) = FUNC_ERR then
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446 raise Program_Error;
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447 end if;
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448 end Detach_Handler;
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449
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450 ---------------
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451 -- Reference --
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452 ---------------
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453
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454 function Reference (Interrupt : Interrupt_ID) return System.Address is
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455 Signal : constant System.Address :=
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456 System.Storage_Elements.To_Address
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457 (System.Storage_Elements.Integer_Address (Interrupt));
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458
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459 begin
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460 if Is_Reserved (Interrupt) then
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461
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462 -- Only usable Interrupts can be used for binding it to an Entry
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463
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464 raise Program_Error;
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465 end if;
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466
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467 return Signal;
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468 end Reference;
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469
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470 --------------------------------
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471 -- Register_Interrupt_Handler --
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472 --------------------------------
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473
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474 procedure Register_Interrupt_Handler (Handler_Addr : System.Address) is
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475 begin
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476 Registered_Handlers :=
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477 new Registered_Handler'(H => Handler_Addr, Next => Registered_Handlers);
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478 end Register_Interrupt_Handler;
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479
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480 -------------------
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481 -- Is_Registered --
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482 -------------------
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483
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484 -- See if the Handler has been "pragma"ed using Interrupt_Handler.
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485 -- Always consider a null handler as registered.
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486
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487 function Is_Registered (Handler : Parameterless_Handler) return Boolean is
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488 Ptr : R_Link := Registered_Handlers;
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489
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490 type Fat_Ptr is record
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491 Object_Addr : System.Address;
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492 Handler_Addr : System.Address;
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493 end record;
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494
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495 function To_Fat_Ptr is new Ada.Unchecked_Conversion
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496 (Parameterless_Handler, Fat_Ptr);
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497
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498 Fat : Fat_Ptr;
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499
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500 begin
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501 if Handler = null then
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502 return True;
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503 end if;
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504
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505 Fat := To_Fat_Ptr (Handler);
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506
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507 while Ptr /= null loop
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508 if Ptr.H = Fat.Handler_Addr then
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509 return True;
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510 end if;
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511
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512 Ptr := Ptr.Next;
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513 end loop;
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514
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515 return False;
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516 end Is_Registered;
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517
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518 -----------------------------
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519 -- Bind_Interrupt_To_Entry --
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520 -----------------------------
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521
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522 procedure Bind_Interrupt_To_Entry
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523 (T : Task_Id;
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524 E : Task_Entry_Index;
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525 Int_Ref : System.Address)
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526 is
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527 Interrupt : constant Interrupt_ID :=
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528 Interrupt_ID (Storage_Elements.To_Integer (Int_Ref));
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529
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530 New_Task : Server_Task_Access;
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531
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532 begin
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533 if Is_Reserved (Interrupt) then
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534 raise Program_Error;
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535 end if;
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536
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537 if Descriptors (Interrupt).Kind /= Unknown then
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538 raise Program_Error with
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539 "a binding for this interrupt is already present";
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540 end if;
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541
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542 if Handlers (Interrupt) = null then
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543 New_Task := new Server_Task (Interrupt);
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544 Handlers (Interrupt) := To_System (New_Task.all'Identity);
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545 end if;
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546
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547 if intr_attach (int (Interrupt),
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548 TISR (Signal_Handler'Access)) = FUNC_ERR
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549 then
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550 raise Program_Error;
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551 end if;
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552
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553 Descriptors (Interrupt).Kind := Task_Entry;
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554 Descriptors (Interrupt).T := T;
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555 Descriptors (Interrupt).E := E;
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556
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557 -- Indicate the attachment of Interrupt Entry in ATCB. This is needed so
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558 -- that when an Interrupt Entry task terminates the binding can be
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559 -- cleaned up. The call to unbinding must be make by the task before it
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560 -- terminates.
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561
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562 T.Interrupt_Entry := True;
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563 end Bind_Interrupt_To_Entry;
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564
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565 ------------------------------
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566 -- Detach_Interrupt_Entries --
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567 ------------------------------
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568
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569 procedure Detach_Interrupt_Entries (T : Task_Id) is
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570 begin
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571 for J in Interrupt_ID loop
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572 if not Is_Reserved (J) then
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573 if Descriptors (J).Kind = Task_Entry
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574 and then Descriptors (J).T = T
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575 then
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576 Descriptors (J).Kind := Unknown;
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577
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578 if intr_attach (int (J), null) = FUNC_ERR then
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579 raise Program_Error;
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580 end if;
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581 end if;
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582 end if;
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583 end loop;
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584
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585 -- Indicate in ATCB that no Interrupt Entries are attached
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586
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587 T.Interrupt_Entry := True;
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588 end Detach_Interrupt_Entries;
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589
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590 ---------------------
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591 -- Block_Interrupt --
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592 ---------------------
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593
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594 procedure Block_Interrupt (Interrupt : Interrupt_ID) is
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595 begin
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596 raise Program_Error;
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597 end Block_Interrupt;
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598
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599 -----------------------
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600 -- Unblock_Interrupt --
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601 -----------------------
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602
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603 procedure Unblock_Interrupt (Interrupt : Interrupt_ID) is
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604 begin
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605 raise Program_Error;
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606 end Unblock_Interrupt;
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607
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608 ----------------
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609 -- Is_Blocked --
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610 ----------------
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611
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612 function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is
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613 begin
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614 raise Program_Error;
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615 return False;
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616 end Is_Blocked;
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617
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618 task body Server_Task is
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619 Ignore : constant Boolean := Utilities.Make_Independent;
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620
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621 Desc : Handler_Desc renames Descriptors (Interrupt);
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622 Self_Id : constant Task_Id := STPO.Self;
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623 Temp : Parameterless_Handler;
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624
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625 begin
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626 loop
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627 while Interrupt_Count (Interrupt) > 0 loop
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628 Interrupt_Count (Interrupt) := Interrupt_Count (Interrupt) - 1;
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629 begin
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630 case Desc.Kind is
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631 when Unknown =>
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632 null;
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633 when Task_Entry =>
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634 Rendezvous.Call_Simple (Desc.T, Desc.E, Null_Address);
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635 when Protected_Procedure =>
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636 Temp := Desc.H;
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637 Temp.all;
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638 end case;
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639 exception
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640 when others => null;
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641 end;
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642 end loop;
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643
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644 Initialization.Defer_Abort (Self_Id);
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645
|
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646 if Single_Lock then
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647 STPO.Lock_RTS;
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648 end if;
|
|
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649
|
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650 STPO.Write_Lock (Self_Id);
|
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|
651 Self_Id.Common.State := Interrupt_Server_Idle_Sleep;
|
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652 STPO.Sleep (Self_Id, Interrupt_Server_Idle_Sleep);
|
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|
653 Self_Id.Common.State := Runnable;
|
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|
654 STPO.Unlock (Self_Id);
|
|
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655
|
|
|
656 if Single_Lock then
|
|
|
657 STPO.Unlock_RTS;
|
|
|
658 end if;
|
|
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659
|
|
|
660 Initialization.Undefer_Abort (Self_Id);
|
|
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661
|
|
|
662 -- Undefer abort here to allow a window for this task to be aborted
|
|
|
663 -- at the time of system shutdown.
|
|
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664
|
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|
665 end loop;
|
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|
666 end Server_Task;
|
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667
|
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668 end System.Interrupts;
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