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111
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1 /****************************************************************************
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2 * *
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3 * GNAT COMPILER COMPONENTS *
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4 * *
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5 * I N I T *
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6 * *
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7 * C Implementation File *
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8 * *
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131
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9 * Copyright (C) 1992-2018, Free Software Foundation, Inc. *
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111
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10 * *
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11 * GNAT 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 * GNAT was originally developed by the GNAT team at New York 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 unit contains initialization circuits that are system dependent.
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33 A major part of the functionality involves stack overflow checking.
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34 The GCC backend generates probe instructions to test for stack overflow.
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35 For details on the exact approach used to generate these probes, see the
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36 "Using and Porting GCC" manual, in particular the "Stack Checking" section
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37 and the subsection "Specifying How Stack Checking is Done". The handlers
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38 installed by this file are used to catch the resulting signals that come
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39 from these probes failing (i.e. touching protected pages). */
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40
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41 /* This file should be kept synchronized with s-init.ads, s-init.adb and the
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42 s-init-*.adb variants. All these files implement the required functionality
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43 for different targets. */
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44
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45 /* The following include is here to meet the published VxWorks requirement
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46 that the __vxworks header appear before any other include. */
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47 #ifdef __vxworks
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48 #include "vxWorks.h"
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49 #include "version.h" /* for _WRS_VXWORKS_MAJOR */
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50 #endif
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51
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52 #ifdef __ANDROID__
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53 #undef __linux__
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54 #endif
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55
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56 #ifdef IN_RTS
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57 #include "tconfig.h"
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58 #include "tsystem.h"
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59 #include <sys/stat.h>
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60
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61 /* We don't have libiberty, so use malloc. */
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62 #define xmalloc(S) malloc (S)
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63 #else
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64 #include "config.h"
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65 #include "system.h"
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66 #endif
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67
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68 #include "adaint.h"
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69 #include "raise.h"
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70
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71 #ifdef __cplusplus
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72 extern "C" {
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73 #endif
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74
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75 extern void __gnat_raise_program_error (const char *, int);
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76
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77 /* Addresses of exception data blocks for predefined exceptions. Tasking_Error
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78 is not used in this unit, and the abort signal is only used on IRIX.
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79 ??? Revisit this part since IRIX is no longer supported. */
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80 extern struct Exception_Data constraint_error;
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81 extern struct Exception_Data numeric_error;
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82 extern struct Exception_Data program_error;
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83 extern struct Exception_Data storage_error;
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84
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85 /* For the Cert run time we use the regular raise exception routine because
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86 Raise_From_Signal_Handler is not available. */
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87 #ifdef CERT
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88 #define Raise_From_Signal_Handler \
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89 __gnat_raise_exception
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90 extern void Raise_From_Signal_Handler (struct Exception_Data *, const char *);
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91 #else
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92 #define Raise_From_Signal_Handler \
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93 ada__exceptions__raise_from_signal_handler
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94 extern void Raise_From_Signal_Handler (struct Exception_Data *, const char *);
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95 #endif
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96
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97 /* Global values computed by the binder. Note that these variables are
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98 declared here, not in the binder file, to avoid having unresolved
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99 references in the shared libgnat. */
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100 int __gl_main_priority = -1;
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101 int __gl_main_cpu = -1;
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102 int __gl_time_slice_val = -1;
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103 char __gl_wc_encoding = 'n';
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104 char __gl_locking_policy = ' ';
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105 char __gl_queuing_policy = ' ';
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106 char __gl_task_dispatching_policy = ' ';
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107 char *__gl_priority_specific_dispatching = 0;
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108 int __gl_num_specific_dispatching = 0;
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109 char *__gl_interrupt_states = 0;
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110 int __gl_num_interrupt_states = 0;
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111 int __gl_unreserve_all_interrupts = 0;
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112 int __gl_exception_tracebacks = 0;
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113 int __gl_exception_tracebacks_symbolic = 0;
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114 int __gl_detect_blocking = 0;
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115 int __gl_default_stack_size = -1;
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116 int __gl_leap_seconds_support = 0;
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117 int __gl_canonical_streams = 0;
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118 char *__gl_bind_env_addr = NULL;
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119
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120 /* This value is not used anymore, but kept for bootstrapping purpose. */
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121 int __gl_zero_cost_exceptions = 0;
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122
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123 /* Indication of whether synchronous signal handler has already been
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124 installed by a previous call to adainit. */
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125 int __gnat_handler_installed = 0;
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126
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127 #ifndef IN_RTS
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128 int __gnat_inside_elab_final_code = 0;
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129 /* ??? This variable is obsolete since 2001-08-29 but is kept to allow
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130 bootstrap from old GNAT versions (< 3.15). */
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131 #endif
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132
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133 /* HAVE_GNAT_INIT_FLOAT must be set on every targets where a __gnat_init_float
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134 is defined. If this is not set then a void implementation will be defined
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135 at the end of this unit. */
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136 #undef HAVE_GNAT_INIT_FLOAT
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137
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138 /******************************/
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139 /* __gnat_get_interrupt_state */
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140 /******************************/
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141
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142 char __gnat_get_interrupt_state (int);
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143
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144 /* This routine is called from the runtime as needed to determine the state
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145 of an interrupt, as set by an Interrupt_State pragma appearing anywhere
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146 in the current partition. The input argument is the interrupt number,
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147 and the result is one of the following:
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148
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149 'n' this interrupt not set by any Interrupt_State pragma
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150 'u' Interrupt_State pragma set state to User
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151 'r' Interrupt_State pragma set state to Runtime
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152 's' Interrupt_State pragma set state to System */
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153
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154 char
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155 __gnat_get_interrupt_state (int intrup)
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156 {
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157 if (intrup >= __gl_num_interrupt_states)
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158 return 'n';
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159 else
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160 return __gl_interrupt_states [intrup];
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161 }
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162
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163 /***********************************/
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164 /* __gnat_get_specific_dispatching */
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165 /***********************************/
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166
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167 char __gnat_get_specific_dispatching (int);
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168
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169 /* This routine is called from the runtime as needed to determine the
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170 priority specific dispatching policy, as set by a
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171 Priority_Specific_Dispatching pragma appearing anywhere in the current
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172 partition. The input argument is the priority number, and the result
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173 is the upper case first character of the policy name, e.g. 'F' for
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174 FIFO_Within_Priorities. A space ' ' is returned if no
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175 Priority_Specific_Dispatching pragma is used in the partition. */
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176
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177 char
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178 __gnat_get_specific_dispatching (int priority)
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179 {
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180 if (__gl_num_specific_dispatching == 0)
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181 return ' ';
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182 else if (priority >= __gl_num_specific_dispatching)
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183 return 'F';
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184 else
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185 return __gl_priority_specific_dispatching [priority];
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186 }
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187
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188 #ifndef IN_RTS
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189
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190 /**********************/
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191 /* __gnat_set_globals */
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192 /**********************/
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193
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194 /* This routine is kept for bootstrapping purposes, since the binder generated
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195 file now sets the __gl_* variables directly. */
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196
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197 void
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198 __gnat_set_globals (void)
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199 {
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200 }
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201
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202 #endif
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203
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204 /***************/
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205 /* AIX Section */
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206 /***************/
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207
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208 #if defined (_AIX)
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209
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210 #include <signal.h>
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211 #include <sys/time.h>
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212
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213 /* Some versions of AIX don't define SA_NODEFER. */
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214
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215 #ifndef SA_NODEFER
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216 #define SA_NODEFER 0
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217 #endif /* SA_NODEFER */
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218
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219 /* Versions of AIX before 4.3 don't have nanosleep but provide
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220 nsleep instead. */
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221
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222 #ifndef _AIXVERSION_430
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223
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224 extern int nanosleep (struct timestruc_t *, struct timestruc_t *);
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225
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226 int
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227 nanosleep (struct timestruc_t *Rqtp, struct timestruc_t *Rmtp)
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228 {
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229 return nsleep (Rqtp, Rmtp);
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230 }
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231
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232 #endif /* _AIXVERSION_430 */
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233
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234 static void
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235 __gnat_error_handler (int sig,
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236 siginfo_t *si ATTRIBUTE_UNUSED,
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237 void *ucontext ATTRIBUTE_UNUSED)
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238 {
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239 struct Exception_Data *exception;
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240 const char *msg;
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241
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242 switch (sig)
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243 {
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244 case SIGSEGV:
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245 /* FIXME: we need to detect the case of a *real* SIGSEGV. */
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246 exception = &storage_error;
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247 msg = "stack overflow or erroneous memory access";
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248 break;
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249
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250 case SIGBUS:
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251 exception = &constraint_error;
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252 msg = "SIGBUS";
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253 break;
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254
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255 case SIGFPE:
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256 exception = &constraint_error;
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257 msg = "SIGFPE";
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258 break;
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259
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260 default:
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261 exception = &program_error;
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262 msg = "unhandled signal";
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263 }
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264
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265 Raise_From_Signal_Handler (exception, msg);
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266 }
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267
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268 void
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269 __gnat_install_handler (void)
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270 {
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271 struct sigaction act;
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272
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273 /* Set up signal handler to map synchronous signals to appropriate
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274 exceptions. Make sure that the handler isn't interrupted by another
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275 signal that might cause a scheduling event! */
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276
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277 act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
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278 act.sa_sigaction = __gnat_error_handler;
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279 sigemptyset (&act.sa_mask);
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280
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281 /* Do not install handlers if interrupt state is "System". */
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282 if (__gnat_get_interrupt_state (SIGABRT) != 's')
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283 sigaction (SIGABRT, &act, NULL);
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284 if (__gnat_get_interrupt_state (SIGFPE) != 's')
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285 sigaction (SIGFPE, &act, NULL);
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286 if (__gnat_get_interrupt_state (SIGILL) != 's')
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287 sigaction (SIGILL, &act, NULL);
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288 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
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289 sigaction (SIGSEGV, &act, NULL);
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290 if (__gnat_get_interrupt_state (SIGBUS) != 's')
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291 sigaction (SIGBUS, &act, NULL);
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292
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293 __gnat_handler_installed = 1;
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294 }
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295
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296 /*****************/
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297 /* HP-UX section */
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298 /*****************/
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299
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300 #elif defined (__hpux__)
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301
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302 #include <signal.h>
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303 #include <sys/ucontext.h>
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304
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305 #if defined (IN_RTS) && defined (__ia64__)
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306
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307 #include <sys/uc_access.h>
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308
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309 #define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
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310
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311 void
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312 __gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED, void *ucontext)
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313 {
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314 ucontext_t *uc = (ucontext_t *) ucontext;
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315 uint64_t ip;
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316
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317 /* Adjust on itanium, as GetIPInfo is not supported. */
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318 __uc_get_ip (uc, &ip);
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319 __uc_set_ip (uc, ip + 1);
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320 }
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321 #endif /* IN_RTS && __ia64__ */
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322
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323 /* Tasking and Non-tasking signal handler. Map SIGnal to Ada exception
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324 propagation after the required low level adjustments. */
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325
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326 static void
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327 __gnat_error_handler (int sig, siginfo_t *si ATTRIBUTE_UNUSED, void *ucontext)
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328 {
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329 struct Exception_Data *exception;
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330 const char *msg;
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331
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332 __gnat_adjust_context_for_raise (sig, ucontext);
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333
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334 switch (sig)
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335 {
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336 case SIGSEGV:
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337 /* FIXME: we need to detect the case of a *real* SIGSEGV. */
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338 exception = &storage_error;
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339 msg = "stack overflow or erroneous memory access";
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340 break;
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341
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342 case SIGBUS:
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343 exception = &constraint_error;
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344 msg = "SIGBUS";
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345 break;
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346
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347 case SIGFPE:
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348 exception = &constraint_error;
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349 msg = "SIGFPE";
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350 break;
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351
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352 default:
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353 exception = &program_error;
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354 msg = "unhandled signal";
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355 }
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356
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357 Raise_From_Signal_Handler (exception, msg);
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358 }
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359
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360 /* This must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
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361 #if defined (__hppa__)
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362 char __gnat_alternate_stack[16 * 1024]; /* 2 * SIGSTKSZ */
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363 #else
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364 char __gnat_alternate_stack[128 * 1024]; /* MINSIGSTKSZ */
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365 #endif
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366
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367 void
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368 __gnat_install_handler (void)
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369 {
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370 struct sigaction act;
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371
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372 /* Set up signal handler to map synchronous signals to appropriate
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373 exceptions. Make sure that the handler isn't interrupted by another
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374 signal that might cause a scheduling event! Also setup an alternate
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375 stack region for the handler execution so that stack overflows can be
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376 handled properly, avoiding a SEGV generation from stack usage by the
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377 handler itself. */
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378
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379 stack_t stack;
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380 stack.ss_sp = __gnat_alternate_stack;
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381 stack.ss_size = sizeof (__gnat_alternate_stack);
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382 stack.ss_flags = 0;
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383 sigaltstack (&stack, NULL);
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384
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385 act.sa_sigaction = __gnat_error_handler;
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386 act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
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387 sigemptyset (&act.sa_mask);
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388
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389 /* Do not install handlers if interrupt state is "System". */
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390 if (__gnat_get_interrupt_state (SIGABRT) != 's')
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391 sigaction (SIGABRT, &act, NULL);
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392 if (__gnat_get_interrupt_state (SIGFPE) != 's')
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393 sigaction (SIGFPE, &act, NULL);
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394 if (__gnat_get_interrupt_state (SIGILL) != 's')
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395 sigaction (SIGILL, &act, NULL);
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396 if (__gnat_get_interrupt_state (SIGBUS) != 's')
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397 sigaction (SIGBUS, &act, NULL);
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398 act.sa_flags |= SA_ONSTACK;
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399 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
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400 sigaction (SIGSEGV, &act, NULL);
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401
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402 __gnat_handler_installed = 1;
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403 }
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404
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405 /*********************/
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406 /* GNU/Linux Section */
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407 /*********************/
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408
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409 #elif defined (__linux__)
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410
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411 #include <signal.h>
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412
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413 #define __USE_GNU 1 /* required to get REG_EIP/RIP from glibc's ucontext.h */
|
|
|
414 #include <sys/ucontext.h>
|
|
|
415
|
|
|
416 /* GNU/Linux, which uses glibc, does not define NULL in included
|
|
|
417 header files. */
|
|
|
418
|
|
|
419 #if !defined (NULL)
|
|
|
420 #define NULL ((void *) 0)
|
|
|
421 #endif
|
|
|
422
|
|
|
423 #if defined (MaRTE)
|
|
|
424
|
|
|
425 /* MaRTE OS provides its own version of sigaction, sigfillset, and
|
|
|
426 sigemptyset (overriding these symbol names). We want to make sure that
|
|
|
427 the versions provided by the underlying C library are used here (these
|
|
|
428 versions are renamed by MaRTE to linux_sigaction, fake_linux_sigfillset,
|
|
|
429 and fake_linux_sigemptyset, respectively). The MaRTE library will not
|
|
|
430 always be present (it will not be linked if no tasking constructs are
|
|
|
431 used), so we use the weak symbol mechanism to point always to the symbols
|
|
|
432 defined within the C library. */
|
|
|
433
|
|
|
434 #pragma weak linux_sigaction
|
|
|
435 int linux_sigaction (int signum, const struct sigaction *act,
|
|
|
436 struct sigaction *oldact)
|
|
|
437 {
|
|
|
438 return sigaction (signum, act, oldact);
|
|
|
439 }
|
|
|
440 #define sigaction(signum, act, oldact) linux_sigaction (signum, act, oldact)
|
|
|
441
|
|
|
442 #pragma weak fake_linux_sigfillset
|
|
|
443 void fake_linux_sigfillset (sigset_t *set)
|
|
|
444 {
|
|
|
445 sigfillset (set);
|
|
|
446 }
|
|
|
447 #define sigfillset(set) fake_linux_sigfillset (set)
|
|
|
448
|
|
|
449 #pragma weak fake_linux_sigemptyset
|
|
|
450 void fake_linux_sigemptyset (sigset_t *set)
|
|
|
451 {
|
|
|
452 sigemptyset (set);
|
|
|
453 }
|
|
|
454 #define sigemptyset(set) fake_linux_sigemptyset (set)
|
|
|
455
|
|
|
456 #endif
|
|
|
457
|
|
|
458 #if defined (__i386__) || defined (__x86_64__) || defined (__ia64__) \
|
|
|
459 || defined (__ARMEL__)
|
|
|
460
|
|
|
461 #define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
462
|
|
|
463 void
|
|
|
464 __gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED, void *ucontext)
|
|
|
465 {
|
|
|
466 mcontext_t *mcontext = &((ucontext_t *) ucontext)->uc_mcontext;
|
|
|
467
|
|
|
468 /* On the i386 and x86-64 architectures, stack checking is performed by
|
|
|
469 means of probes with moving stack pointer, that is to say the probed
|
|
|
470 address is always the value of the stack pointer. Upon hitting the
|
|
|
471 guard page, the stack pointer therefore points to an inaccessible
|
|
|
472 address and an alternate signal stack is needed to run the handler.
|
|
|
473 But there is an additional twist: on these architectures, the EH
|
|
|
474 return code writes the address of the handler at the target CFA's
|
|
|
475 value on the stack before doing the jump. As a consequence, if
|
|
|
476 there is an active handler in the frame whose stack has overflowed,
|
|
|
477 the stack pointer must nevertheless point to an accessible address
|
|
|
478 by the time the EH return is executed.
|
|
|
479
|
|
|
480 We therefore adjust the saved value of the stack pointer by the size
|
|
|
481 of one page + a small dope of 4 words, in order to make sure that it
|
|
|
482 points to an accessible address in case it's used as the target CFA.
|
|
|
483 The stack checking code guarantees that this address is unused by the
|
|
|
484 time this happens. */
|
|
|
485
|
|
|
486 #if defined (__i386__)
|
|
|
487 unsigned long *pc = (unsigned long *)mcontext->gregs[REG_EIP];
|
|
|
488 /* The pattern is "orl $0x0,(%esp)" for a probe in 32-bit mode. */
|
|
|
489 if (signo == SIGSEGV && pc && *pc == 0x00240c83)
|
|
|
490 mcontext->gregs[REG_ESP] += 4096 + 4 * sizeof (unsigned long);
|
|
|
491 #elif defined (__x86_64__)
|
|
|
492 unsigned long long *pc = (unsigned long long *)mcontext->gregs[REG_RIP];
|
|
|
493 if (signo == SIGSEGV && pc
|
|
|
494 /* The pattern is "orq $0x0,(%rsp)" for a probe in 64-bit mode. */
|
|
|
495 && ((*pc & 0xffffffffffLL) == 0x00240c8348LL
|
|
|
496 /* The pattern may also be "orl $0x0,(%esp)" for a probe in
|
|
|
497 x32 mode. */
|
|
|
498 || (*pc & 0xffffffffLL) == 0x00240c83LL))
|
|
|
499 mcontext->gregs[REG_RSP] += 4096 + 4 * sizeof (unsigned long);
|
|
|
500 #elif defined (__ia64__)
|
|
|
501 /* ??? The IA-64 unwinder doesn't compensate for signals. */
|
|
|
502 mcontext->sc_ip++;
|
|
|
503 #elif defined (__ARMEL__)
|
|
|
504 /* ARM Bump has to be an even number because of odd/even architecture. */
|
|
|
505 mcontext->arm_pc+=2;
|
|
|
506 #ifdef __thumb2__
|
|
|
507 #define CPSR_THUMB_BIT 5
|
|
|
508 /* For thumb, the return address much have the low order bit set, otherwise
|
|
|
509 the unwinder will reset to "arm" mode upon return. As long as the
|
|
|
510 compilation unit containing the landing pad is compiled with the same
|
|
|
511 mode (arm vs thumb) as the signaling compilation unit, this works. */
|
|
|
512 if (mcontext->arm_cpsr & (1<<CPSR_THUMB_BIT))
|
|
|
513 mcontext->arm_pc+=1;
|
|
|
514 #endif
|
|
|
515 #endif
|
|
|
516 }
|
|
|
517
|
|
|
518 #endif
|
|
|
519
|
|
|
520 static void
|
|
|
521 __gnat_error_handler (int sig, siginfo_t *si ATTRIBUTE_UNUSED, void *ucontext)
|
|
|
522 {
|
|
|
523 struct Exception_Data *exception;
|
|
|
524 const char *msg;
|
|
|
525
|
|
|
526 /* Adjusting is required for every fault context, so adjust for this one
|
|
|
527 now, before we possibly trigger a recursive fault below. */
|
|
|
528 __gnat_adjust_context_for_raise (sig, ucontext);
|
|
|
529
|
|
|
530 switch (sig)
|
|
|
531 {
|
|
|
532 case SIGSEGV:
|
|
|
533 /* Here we would like a discrimination test to see whether the page
|
|
|
534 before the faulting address is accessible. Unfortunately, Linux
|
|
|
535 seems to have no way of giving us the faulting address.
|
|
|
536
|
|
|
537 In old versions of init.c, we had a test of the page before the
|
|
|
538 stack pointer:
|
|
|
539
|
|
|
540 ((volatile char *)
|
|
|
541 ((long) si->esp_at_signal & - getpagesize ()))[getpagesize ()];
|
|
|
542
|
|
|
543 but that's wrong since it tests the stack pointer location and the
|
|
|
544 stack probing code may not move it until all probes succeed.
|
|
|
545
|
|
|
546 For now we simply do not attempt any discrimination at all. Note
|
|
|
547 that this is quite acceptable, since a "real" SIGSEGV can only
|
|
|
548 occur as the result of an erroneous program. */
|
|
|
549 exception = &storage_error;
|
|
|
550 msg = "stack overflow or erroneous memory access";
|
|
|
551 break;
|
|
|
552
|
|
|
553 case SIGBUS:
|
|
|
554 exception = &storage_error;
|
|
|
555 msg = "SIGBUS: possible stack overflow";
|
|
|
556 break;
|
|
|
557
|
|
|
558 case SIGFPE:
|
|
|
559 exception = &constraint_error;
|
|
|
560 msg = "SIGFPE";
|
|
|
561 break;
|
|
|
562
|
|
|
563 default:
|
|
|
564 exception = &program_error;
|
|
|
565 msg = "unhandled signal";
|
|
|
566 }
|
|
|
567
|
|
|
568 Raise_From_Signal_Handler (exception, msg);
|
|
|
569 }
|
|
|
570
|
|
|
571 #ifndef __ia64__
|
|
|
572 #define HAVE_GNAT_ALTERNATE_STACK 1
|
|
|
573 /* This must be in keeping with System.OS_Interface.Alternate_Stack_Size.
|
|
|
574 It must be larger than MINSIGSTKSZ and hopefully near 2 * SIGSTKSZ. */
|
|
|
575 # if 16 * 1024 < MINSIGSTKSZ
|
|
|
576 # error "__gnat_alternate_stack too small"
|
|
|
577 # endif
|
|
|
578 char __gnat_alternate_stack[16 * 1024];
|
|
|
579 #endif
|
|
|
580
|
|
|
581 #ifdef __XENO__
|
|
|
582 #include <sys/mman.h>
|
|
|
583 #include <native/task.h>
|
|
|
584
|
|
|
585 RT_TASK main_task;
|
|
|
586 #endif
|
|
|
587
|
|
|
588 void
|
|
|
589 __gnat_install_handler (void)
|
|
|
590 {
|
|
|
591 struct sigaction act;
|
|
|
592
|
|
|
593 #ifdef __XENO__
|
|
|
594 int prio;
|
|
|
595
|
|
|
596 if (__gl_main_priority == -1)
|
|
|
597 prio = 49;
|
|
|
598 else
|
|
|
599 prio = __gl_main_priority;
|
|
|
600
|
|
|
601 /* Avoid memory swapping for this program */
|
|
|
602
|
|
|
603 mlockall (MCL_CURRENT|MCL_FUTURE);
|
|
|
604
|
|
|
605 /* Turn the current Linux task into a native Xenomai task */
|
|
|
606
|
|
|
607 rt_task_shadow (&main_task, "environment_task", prio, T_FPU);
|
|
|
608 #endif
|
|
|
609
|
|
|
610 /* Set up signal handler to map synchronous signals to appropriate
|
|
|
611 exceptions. Make sure that the handler isn't interrupted by another
|
|
|
612 signal that might cause a scheduling event! Also setup an alternate
|
|
|
613 stack region for the handler execution so that stack overflows can be
|
|
|
614 handled properly, avoiding a SEGV generation from stack usage by the
|
|
|
615 handler itself. */
|
|
|
616
|
|
|
617 act.sa_sigaction = __gnat_error_handler;
|
|
|
618 act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
|
619 sigemptyset (&act.sa_mask);
|
|
|
620
|
|
|
621 /* Do not install handlers if interrupt state is "System". */
|
|
|
622 if (__gnat_get_interrupt_state (SIGABRT) != 's')
|
|
|
623 sigaction (SIGABRT, &act, NULL);
|
|
|
624 if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
|
625 sigaction (SIGFPE, &act, NULL);
|
|
|
626 if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
|
627 sigaction (SIGILL, &act, NULL);
|
|
|
628 if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
|
629 sigaction (SIGBUS, &act, NULL);
|
|
|
630 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
|
631 {
|
|
|
632 #ifdef HAVE_GNAT_ALTERNATE_STACK
|
|
|
633 /* Setup an alternate stack region for the handler execution so that
|
|
|
634 stack overflows can be handled properly, avoiding a SEGV generation
|
|
|
635 from stack usage by the handler itself. */
|
|
|
636 stack_t stack;
|
|
|
637
|
|
|
638 stack.ss_sp = __gnat_alternate_stack;
|
|
|
639 stack.ss_size = sizeof (__gnat_alternate_stack);
|
|
|
640 stack.ss_flags = 0;
|
|
|
641 sigaltstack (&stack, NULL);
|
|
|
642
|
|
|
643 act.sa_flags |= SA_ONSTACK;
|
|
|
644 #endif
|
|
|
645 sigaction (SIGSEGV, &act, NULL);
|
|
|
646 }
|
|
|
647
|
|
|
648 __gnat_handler_installed = 1;
|
|
|
649 }
|
|
|
650
|
|
|
651 /*******************/
|
|
|
652 /* LynxOS Section */
|
|
|
653 /*******************/
|
|
|
654
|
|
|
655 #elif defined (__Lynx__)
|
|
|
656
|
|
|
657 #include <signal.h>
|
|
|
658 #include <unistd.h>
|
|
|
659
|
|
|
660 static void
|
|
|
661 __gnat_error_handler (int sig)
|
|
|
662 {
|
|
|
663 struct Exception_Data *exception;
|
|
|
664 const char *msg;
|
|
|
665
|
|
|
666 switch(sig)
|
|
|
667 {
|
|
|
668 case SIGFPE:
|
|
|
669 exception = &constraint_error;
|
|
|
670 msg = "SIGFPE";
|
|
|
671 break;
|
|
|
672 case SIGILL:
|
|
|
673 exception = &constraint_error;
|
|
|
674 msg = "SIGILL";
|
|
|
675 break;
|
|
|
676 case SIGSEGV:
|
|
|
677 exception = &storage_error;
|
|
|
678 msg = "stack overflow or erroneous memory access";
|
|
|
679 break;
|
|
|
680 case SIGBUS:
|
|
|
681 exception = &constraint_error;
|
|
|
682 msg = "SIGBUS";
|
|
|
683 break;
|
|
|
684 default:
|
|
|
685 exception = &program_error;
|
|
|
686 msg = "unhandled signal";
|
|
|
687 }
|
|
|
688
|
|
|
689 Raise_From_Signal_Handler (exception, msg);
|
|
|
690 }
|
|
|
691
|
|
|
692 void
|
|
|
693 __gnat_install_handler (void)
|
|
|
694 {
|
|
|
695 struct sigaction act;
|
|
|
696
|
|
|
697 act.sa_handler = __gnat_error_handler;
|
|
|
698 act.sa_flags = 0x0;
|
|
|
699 sigemptyset (&act.sa_mask);
|
|
|
700
|
|
|
701 /* Do not install handlers if interrupt state is "System". */
|
|
|
702 if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
|
703 sigaction (SIGFPE, &act, NULL);
|
|
|
704 if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
|
705 sigaction (SIGILL, &act, NULL);
|
|
|
706 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
|
707 sigaction (SIGSEGV, &act, NULL);
|
|
|
708 if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
|
709 sigaction (SIGBUS, &act, NULL);
|
|
|
710
|
|
|
711 __gnat_handler_installed = 1;
|
|
|
712 }
|
|
|
713
|
|
|
714 /*******************/
|
|
|
715 /* Solaris Section */
|
|
|
716 /*******************/
|
|
|
717
|
|
|
718 #elif defined (__sun__) && !defined (__vxworks)
|
|
|
719
|
|
|
720 #include <signal.h>
|
|
|
721 #include <siginfo.h>
|
|
|
722 #include <sys/ucontext.h>
|
|
|
723 #include <sys/regset.h>
|
|
|
724
|
|
|
725 static void
|
|
|
726 __gnat_error_handler (int sig, siginfo_t *si, void *ucontext ATTRIBUTE_UNUSED)
|
|
|
727 {
|
|
|
728 struct Exception_Data *exception;
|
|
|
729 static int recurse = 0;
|
|
|
730 const char *msg;
|
|
|
731
|
|
|
732 switch (sig)
|
|
|
733 {
|
|
|
734 case SIGSEGV:
|
|
|
735 /* If the problem was permissions, this is a constraint error.
|
|
|
736 Likewise if the failing address isn't maximally aligned or if
|
|
|
737 we've recursed.
|
|
|
738
|
|
|
739 ??? Using a static variable here isn't task-safe, but it's
|
|
|
740 much too hard to do anything else and we're just determining
|
|
|
741 which exception to raise. */
|
|
|
742 if (si->si_code == SEGV_ACCERR
|
|
|
743 || (long) si->si_addr == 0
|
|
|
744 || (((long) si->si_addr) & 3) != 0
|
|
|
745 || recurse)
|
|
|
746 {
|
|
|
747 exception = &constraint_error;
|
|
|
748 msg = "SIGSEGV";
|
|
|
749 }
|
|
|
750 else
|
|
|
751 {
|
|
|
752 /* See if the page before the faulting page is accessible. Do that
|
|
|
753 by trying to access it. We'd like to simply try to access
|
|
|
754 4096 + the faulting address, but it's not guaranteed to be
|
|
|
755 the actual address, just to be on the same page. */
|
|
|
756 recurse++;
|
|
|
757 ((volatile char *)
|
|
|
758 ((long) si->si_addr & - getpagesize ()))[getpagesize ()];
|
|
|
759 exception = &storage_error;
|
|
|
760 msg = "stack overflow or erroneous memory access";
|
|
|
761 }
|
|
|
762 break;
|
|
|
763
|
|
|
764 case SIGBUS:
|
|
|
765 exception = &program_error;
|
|
|
766 msg = "SIGBUS";
|
|
|
767 break;
|
|
|
768
|
|
|
769 case SIGFPE:
|
|
|
770 exception = &constraint_error;
|
|
|
771 msg = "SIGFPE";
|
|
|
772 break;
|
|
|
773
|
|
|
774 default:
|
|
|
775 exception = &program_error;
|
|
|
776 msg = "unhandled signal";
|
|
|
777 }
|
|
|
778
|
|
|
779 recurse = 0;
|
|
|
780 Raise_From_Signal_Handler (exception, msg);
|
|
|
781 }
|
|
|
782
|
|
|
783 void
|
|
|
784 __gnat_install_handler (void)
|
|
|
785 {
|
|
|
786 struct sigaction act;
|
|
|
787
|
|
|
788 /* Set up signal handler to map synchronous signals to appropriate
|
|
|
789 exceptions. Make sure that the handler isn't interrupted by another
|
|
|
790 signal that might cause a scheduling event! */
|
|
|
791
|
|
|
792 act.sa_sigaction = __gnat_error_handler;
|
|
|
793 act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
|
794 sigemptyset (&act.sa_mask);
|
|
|
795
|
|
|
796 /* Do not install handlers if interrupt state is "System". */
|
|
|
797 if (__gnat_get_interrupt_state (SIGABRT) != 's')
|
|
|
798 sigaction (SIGABRT, &act, NULL);
|
|
|
799 if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
|
800 sigaction (SIGFPE, &act, NULL);
|
|
|
801 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
|
802 sigaction (SIGSEGV, &act, NULL);
|
|
|
803 if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
|
804 sigaction (SIGBUS, &act, NULL);
|
|
|
805
|
|
|
806 __gnat_handler_installed = 1;
|
|
|
807 }
|
|
|
808
|
|
|
809 /***************/
|
|
|
810 /* VMS Section */
|
|
|
811 /***************/
|
|
|
812
|
|
|
813 #elif defined (VMS)
|
|
|
814
|
|
|
815 /* Routine called from binder to override default feature values. */
|
|
|
816 void __gnat_set_features (void);
|
|
|
817 int __gnat_features_set = 0;
|
|
|
818 void (*__gnat_ctrl_c_handler) (void) = 0;
|
|
|
819
|
|
|
820 #ifdef __IA64
|
|
|
821 #define lib_get_curr_invo_context LIB$I64_GET_CURR_INVO_CONTEXT
|
|
|
822 #define lib_get_prev_invo_context LIB$I64_GET_PREV_INVO_CONTEXT
|
|
|
823 #define lib_get_invo_handle LIB$I64_GET_INVO_HANDLE
|
|
|
824 #else
|
|
|
825 #define lib_get_curr_invo_context LIB$GET_CURR_INVO_CONTEXT
|
|
|
826 #define lib_get_prev_invo_context LIB$GET_PREV_INVO_CONTEXT
|
|
|
827 #define lib_get_invo_handle LIB$GET_INVO_HANDLE
|
|
|
828 #endif
|
|
|
829
|
|
|
830 /* Masks for facility identification. */
|
|
|
831 #define FAC_MASK 0x0fff0000
|
|
|
832 #define DECADA_M_FACILITY 0x00310000
|
|
|
833
|
|
|
834 /* Define macro symbols for the VMS conditions that become Ada exceptions.
|
|
|
835 It would be better to just include <ssdef.h> */
|
|
|
836
|
|
|
837 #define SS$_CONTINUE 1
|
|
|
838 #define SS$_ACCVIO 12
|
|
|
839 #define SS$_HPARITH 1284
|
|
|
840 #define SS$_INTDIV 1156
|
|
|
841 #define SS$_STKOVF 1364
|
|
|
842 #define SS$_CONTROLC 1617
|
|
|
843 #define SS$_RESIGNAL 2328
|
|
|
844
|
|
|
845 #define MTH$_FLOOVEMAT 1475268 /* Some ACVC_21 CXA tests */
|
|
|
846
|
|
|
847 /* The following codes must be resignalled, and not handled here. */
|
|
|
848
|
|
|
849 /* These codes are in standard message libraries. */
|
|
|
850 extern int C$_SIGKILL;
|
|
|
851 extern int C$_SIGINT;
|
|
|
852 extern int SS$_DEBUG;
|
|
|
853 extern int LIB$_KEYNOTFOU;
|
|
|
854 extern int LIB$_ACTIMAGE;
|
|
|
855
|
|
|
856 /* These codes are non standard, which is to say the author is
|
|
|
857 not sure if they are defined in the standard message libraries
|
|
|
858 so keep them as macros for now. */
|
|
|
859 #define RDB$_STREAM_EOF 20480426
|
|
|
860 #define FDL$_UNPRIKW 11829410
|
|
|
861 #define CMA$_EXIT_THREAD 4227492
|
|
|
862
|
|
|
863 struct cond_sigargs
|
|
|
864 {
|
|
|
865 unsigned int sigarg;
|
|
|
866 unsigned int sigargval;
|
|
|
867 };
|
|
|
868
|
|
|
869 struct cond_subtests
|
|
|
870 {
|
|
|
871 unsigned int num;
|
|
|
872 const struct cond_sigargs sigargs[];
|
|
|
873 };
|
|
|
874
|
|
|
875 struct cond_except
|
|
|
876 {
|
|
|
877 unsigned int cond;
|
|
|
878 const struct Exception_Data *except;
|
|
|
879 unsigned int needs_adjust; /* 1 = adjust PC, 0 = no adjust */
|
|
|
880 const struct cond_subtests *subtests;
|
|
|
881 };
|
|
|
882
|
|
|
883 struct descriptor_s
|
|
|
884 {
|
|
|
885 unsigned short len, mbz;
|
|
|
886 __char_ptr32 adr;
|
|
|
887 };
|
|
|
888
|
|
|
889 /* Conditions that don't have an Ada exception counterpart must raise
|
|
|
890 Non_Ada_Error. Since this is defined in s-auxdec, it should only be
|
|
|
891 referenced by user programs, not the compiler or tools. Hence the
|
|
|
892 #ifdef IN_RTS. */
|
|
|
893
|
|
|
894 #ifdef IN_RTS
|
|
|
895
|
|
|
896 #define Status_Error ada__io_exceptions__status_error
|
|
|
897 extern struct Exception_Data Status_Error;
|
|
|
898
|
|
|
899 #define Mode_Error ada__io_exceptions__mode_error
|
|
|
900 extern struct Exception_Data Mode_Error;
|
|
|
901
|
|
|
902 #define Name_Error ada__io_exceptions__name_error
|
|
|
903 extern struct Exception_Data Name_Error;
|
|
|
904
|
|
|
905 #define Use_Error ada__io_exceptions__use_error
|
|
|
906 extern struct Exception_Data Use_Error;
|
|
|
907
|
|
|
908 #define Device_Error ada__io_exceptions__device_error
|
|
|
909 extern struct Exception_Data Device_Error;
|
|
|
910
|
|
|
911 #define End_Error ada__io_exceptions__end_error
|
|
|
912 extern struct Exception_Data End_Error;
|
|
|
913
|
|
|
914 #define Data_Error ada__io_exceptions__data_error
|
|
|
915 extern struct Exception_Data Data_Error;
|
|
|
916
|
|
|
917 #define Layout_Error ada__io_exceptions__layout_error
|
|
|
918 extern struct Exception_Data Layout_Error;
|
|
|
919
|
|
|
920 #define Non_Ada_Error system__aux_dec__non_ada_error
|
|
|
921 extern struct Exception_Data Non_Ada_Error;
|
|
|
922
|
|
|
923 #define Coded_Exception system__vms_exception_table__coded_exception
|
|
|
924 extern struct Exception_Data *Coded_Exception (void *);
|
|
|
925
|
|
|
926 #define Base_Code_In system__vms_exception_table__base_code_in
|
|
|
927 extern void *Base_Code_In (void *);
|
|
|
928
|
|
|
929 /* DEC Ada exceptions are not defined in a header file, so they
|
|
|
930 must be declared. */
|
|
|
931
|
|
|
932 #define ADA$_ALREADY_OPEN 0x0031a594
|
|
|
933 #define ADA$_CONSTRAINT_ERRO 0x00318324
|
|
|
934 #define ADA$_DATA_ERROR 0x003192c4
|
|
|
935 #define ADA$_DEVICE_ERROR 0x003195e4
|
|
|
936 #define ADA$_END_ERROR 0x00319904
|
|
|
937 #define ADA$_FAC_MODE_MISMAT 0x0031a8b3
|
|
|
938 #define ADA$_IOSYSFAILED 0x0031af04
|
|
|
939 #define ADA$_KEYSIZERR 0x0031aa3c
|
|
|
940 #define ADA$_KEY_MISMATCH 0x0031a8e3
|
|
|
941 #define ADA$_LAYOUT_ERROR 0x00319c24
|
|
|
942 #define ADA$_LINEXCMRS 0x0031a8f3
|
|
|
943 #define ADA$_MAXLINEXC 0x0031a8eb
|
|
|
944 #define ADA$_MODE_ERROR 0x00319f44
|
|
|
945 #define ADA$_MRN_MISMATCH 0x0031a8db
|
|
|
946 #define ADA$_MRS_MISMATCH 0x0031a8d3
|
|
|
947 #define ADA$_NAME_ERROR 0x0031a264
|
|
|
948 #define ADA$_NOT_OPEN 0x0031a58c
|
|
|
949 #define ADA$_ORG_MISMATCH 0x0031a8bb
|
|
|
950 #define ADA$_PROGRAM_ERROR 0x00318964
|
|
|
951 #define ADA$_RAT_MISMATCH 0x0031a8cb
|
|
|
952 #define ADA$_RFM_MISMATCH 0x0031a8c3
|
|
|
953 #define ADA$_STAOVF 0x00318cac
|
|
|
954 #define ADA$_STATUS_ERROR 0x0031a584
|
|
|
955 #define ADA$_STORAGE_ERROR 0x00318c84
|
|
|
956 #define ADA$_UNSUPPORTED 0x0031a8ab
|
|
|
957 #define ADA$_USE_ERROR 0x0031a8a4
|
|
|
958
|
|
|
959 /* DEC Ada specific conditions. */
|
|
|
960 static const struct cond_except dec_ada_cond_except_table [] =
|
|
|
961 {
|
|
|
962 {ADA$_PROGRAM_ERROR, &program_error, 0, 0},
|
|
|
963 {ADA$_USE_ERROR, &Use_Error, 0, 0},
|
|
|
964 {ADA$_KEYSIZERR, &program_error, 0, 0},
|
|
|
965 {ADA$_STAOVF, &storage_error, 0, 0},
|
|
|
966 {ADA$_CONSTRAINT_ERRO, &constraint_error, 0, 0},
|
|
|
967 {ADA$_IOSYSFAILED, &Device_Error, 0, 0},
|
|
|
968 {ADA$_LAYOUT_ERROR, &Layout_Error, 0, 0},
|
|
|
969 {ADA$_STORAGE_ERROR, &storage_error, 0, 0},
|
|
|
970 {ADA$_DATA_ERROR, &Data_Error, 0, 0},
|
|
|
971 {ADA$_DEVICE_ERROR, &Device_Error, 0, 0},
|
|
|
972 {ADA$_END_ERROR, &End_Error, 0, 0},
|
|
|
973 {ADA$_MODE_ERROR, &Mode_Error, 0, 0},
|
|
|
974 {ADA$_NAME_ERROR, &Name_Error, 0, 0},
|
|
|
975 {ADA$_STATUS_ERROR, &Status_Error, 0, 0},
|
|
|
976 {ADA$_NOT_OPEN, &Use_Error, 0, 0},
|
|
|
977 {ADA$_ALREADY_OPEN, &Use_Error, 0, 0},
|
|
|
978 {ADA$_USE_ERROR, &Use_Error, 0, 0},
|
|
|
979 {ADA$_UNSUPPORTED, &Use_Error, 0, 0},
|
|
|
980 {ADA$_FAC_MODE_MISMAT, &Use_Error, 0, 0},
|
|
|
981 {ADA$_ORG_MISMATCH, &Use_Error, 0, 0},
|
|
|
982 {ADA$_RFM_MISMATCH, &Use_Error, 0, 0},
|
|
|
983 {ADA$_RAT_MISMATCH, &Use_Error, 0, 0},
|
|
|
984 {ADA$_MRS_MISMATCH, &Use_Error, 0, 0},
|
|
|
985 {ADA$_MRN_MISMATCH, &Use_Error, 0, 0},
|
|
|
986 {ADA$_KEY_MISMATCH, &Use_Error, 0, 0},
|
|
|
987 {ADA$_MAXLINEXC, &constraint_error, 0, 0},
|
|
|
988 {ADA$_LINEXCMRS, &constraint_error, 0, 0},
|
|
|
989
|
|
|
990 #if 0
|
|
|
991 /* Already handled by a pragma Import_Exception
|
|
|
992 in Aux_IO_Exceptions */
|
|
|
993 {ADA$_LOCK_ERROR, &Lock_Error, 0, 0},
|
|
|
994 {ADA$_EXISTENCE_ERROR, &Existence_Error, 0, 0},
|
|
|
995 {ADA$_KEY_ERROR, &Key_Error, 0, 0},
|
|
|
996 #endif
|
|
|
997
|
|
|
998 {0, 0, 0, 0}
|
|
|
999 };
|
|
|
1000
|
|
|
1001 #endif /* IN_RTS */
|
|
|
1002
|
|
|
1003 /* Non-DEC Ada specific conditions that map to Ada exceptions. */
|
|
|
1004
|
|
|
1005 /* Subtest for ACCVIO Constraint_Error, kept for compatibility,
|
|
|
1006 in hindsight should have just made ACCVIO == Storage_Error. */
|
|
|
1007 #define ACCVIO_VIRTUAL_ADDR 3
|
|
|
1008 static const struct cond_subtests accvio_c_e =
|
|
|
1009 {1, /* number of subtests below */
|
|
|
1010 {
|
|
|
1011 { ACCVIO_VIRTUAL_ADDR, 0 }
|
|
|
1012 }
|
|
|
1013 };
|
|
|
1014
|
|
|
1015 /* Macro flag to adjust PC which gets off by one for some conditions,
|
|
|
1016 not sure if this is reliably true, PC could be off by more for
|
|
|
1017 HPARITH for example, unless a trapb is inserted. */
|
|
|
1018 #define NEEDS_ADJUST 1
|
|
|
1019
|
|
|
1020 static const struct cond_except system_cond_except_table [] =
|
|
|
1021 {
|
|
|
1022 {MTH$_FLOOVEMAT, &constraint_error, 0, 0},
|
|
|
1023 {SS$_INTDIV, &constraint_error, 0, 0},
|
|
|
1024 {SS$_HPARITH, &constraint_error, NEEDS_ADJUST, 0},
|
|
|
1025 {SS$_ACCVIO, &constraint_error, NEEDS_ADJUST, &accvio_c_e},
|
|
|
1026 {SS$_ACCVIO, &storage_error, NEEDS_ADJUST, 0},
|
|
|
1027 {SS$_STKOVF, &storage_error, NEEDS_ADJUST, 0},
|
|
|
1028 {0, 0, 0, 0}
|
|
|
1029 };
|
|
|
1030
|
|
|
1031 /* To deal with VMS conditions and their mapping to Ada exceptions,
|
|
|
1032 the __gnat_error_handler routine below is installed as an exception
|
|
|
1033 vector having precedence over DEC frame handlers. Some conditions
|
|
|
1034 still need to be handled by such handlers, however, in which case
|
|
|
1035 __gnat_error_handler needs to return SS$_RESIGNAL. Consider for
|
|
|
1036 instance the use of a third party library compiled with DECAda and
|
|
|
1037 performing its own exception handling internally.
|
|
|
1038
|
|
|
1039 To allow some user-level flexibility, which conditions should be
|
|
|
1040 resignaled is controlled by a predicate function, provided with the
|
|
|
1041 condition value and returning a boolean indication stating whether
|
|
|
1042 this condition should be resignaled or not.
|
|
|
1043
|
|
|
1044 That predicate function is called indirectly, via a function pointer,
|
|
|
1045 by __gnat_error_handler, and changing that pointer is allowed to the
|
|
|
1046 user code by way of the __gnat_set_resignal_predicate interface.
|
|
|
1047
|
|
|
1048 The user level function may then implement what it likes, including
|
|
|
1049 for instance the maintenance of a dynamic data structure if the set
|
|
|
1050 of to be resignalled conditions has to change over the program's
|
|
|
1051 lifetime.
|
|
|
1052
|
|
|
1053 ??? This is not a perfect solution to deal with the possible
|
|
|
1054 interactions between the GNAT and the DECAda exception handling
|
|
|
1055 models and better (more general) schemes are studied. This is so
|
|
|
1056 just provided as a convenient workaround in the meantime, and
|
|
|
1057 should be use with caution since the implementation has been kept
|
|
|
1058 very simple. */
|
|
|
1059
|
|
|
1060 typedef int resignal_predicate (int code);
|
|
|
1061
|
|
|
1062 static const int * const cond_resignal_table [] =
|
|
|
1063 {
|
|
|
1064 &C$_SIGKILL,
|
|
|
1065 (int *)CMA$_EXIT_THREAD,
|
|
|
1066 &SS$_DEBUG,
|
|
|
1067 &LIB$_KEYNOTFOU,
|
|
|
1068 &LIB$_ACTIMAGE,
|
|
|
1069 (int *) RDB$_STREAM_EOF,
|
|
|
1070 (int *) FDL$_UNPRIKW,
|
|
|
1071 0
|
|
|
1072 };
|
|
|
1073
|
|
|
1074 static const int facility_resignal_table [] =
|
|
|
1075 {
|
|
|
1076 0x1380000, /* RDB */
|
|
|
1077 0x2220000, /* SQL */
|
|
|
1078 0
|
|
|
1079 };
|
|
|
1080
|
|
|
1081 /* Default GNAT predicate for resignaling conditions. */
|
|
|
1082
|
|
|
1083 static int
|
|
|
1084 __gnat_default_resignal_p (int code)
|
|
|
1085 {
|
|
|
1086 int i, iexcept;
|
|
|
1087
|
|
|
1088 for (i = 0; facility_resignal_table [i]; i++)
|
|
|
1089 if ((code & FAC_MASK) == facility_resignal_table [i])
|
|
|
1090 return 1;
|
|
|
1091
|
|
|
1092 for (i = 0, iexcept = 0;
|
|
|
1093 cond_resignal_table [i]
|
|
|
1094 && !(iexcept = LIB$MATCH_COND (&code, &cond_resignal_table [i]));
|
|
|
1095 i++);
|
|
|
1096
|
|
|
1097 return iexcept;
|
|
|
1098 }
|
|
|
1099
|
|
|
1100 /* Static pointer to predicate that the __gnat_error_handler exception
|
|
|
1101 vector invokes to determine if it should resignal a condition. */
|
|
|
1102
|
|
|
1103 static resignal_predicate *__gnat_resignal_p = __gnat_default_resignal_p;
|
|
|
1104
|
|
|
1105 /* User interface to change the predicate pointer to PREDICATE. Reset to
|
|
|
1106 the default if PREDICATE is null. */
|
|
|
1107
|
|
|
1108 void
|
|
|
1109 __gnat_set_resignal_predicate (resignal_predicate *predicate)
|
|
|
1110 {
|
|
|
1111 if (predicate == NULL)
|
|
|
1112 __gnat_resignal_p = __gnat_default_resignal_p;
|
|
|
1113 else
|
|
|
1114 __gnat_resignal_p = predicate;
|
|
|
1115 }
|
|
|
1116
|
|
|
1117 /* Should match System.Parameters.Default_Exception_Msg_Max_Length. */
|
|
|
1118 #define Default_Exception_Msg_Max_Length 512
|
|
|
1119
|
|
|
1120 /* Action routine for SYS$PUTMSG. There may be multiple
|
|
|
1121 conditions, each with text to be appended to MESSAGE
|
|
|
1122 and separated by line termination. */
|
|
|
1123 static int
|
|
|
1124 copy_msg (struct descriptor_s *msgdesc, char *message)
|
|
|
1125 {
|
|
|
1126 int len = strlen (message);
|
|
|
1127 int copy_len;
|
|
|
1128
|
|
|
1129 /* Check for buffer overflow and skip. */
|
|
|
1130 if (len > 0 && len <= Default_Exception_Msg_Max_Length - 3)
|
|
|
1131 {
|
|
|
1132 strcat (message, "\r\n");
|
|
|
1133 len += 2;
|
|
|
1134 }
|
|
|
1135
|
|
|
1136 /* Check for buffer overflow and truncate if necessary. */
|
|
|
1137 copy_len = (len + msgdesc->len <= Default_Exception_Msg_Max_Length - 1 ?
|
|
|
1138 msgdesc->len :
|
|
|
1139 Default_Exception_Msg_Max_Length - 1 - len);
|
|
|
1140 strncpy (&message [len], msgdesc->adr, copy_len);
|
|
|
1141 message [len + copy_len] = 0;
|
|
|
1142
|
|
|
1143 return 0;
|
|
|
1144 }
|
|
|
1145
|
|
|
1146 /* Scan TABLE for a match for the condition contained in SIGARGS,
|
|
|
1147 and return the entry, or the empty entry if no match found. */
|
|
|
1148 static const struct cond_except *
|
|
|
1149 scan_conditions ( int *sigargs, const struct cond_except *table [])
|
|
|
1150 {
|
|
|
1151 int i;
|
|
|
1152 struct cond_except entry;
|
|
|
1153
|
|
|
1154 /* Scan the exception condition table for a match and fetch
|
|
|
1155 the associated GNAT exception pointer. */
|
|
|
1156 for (i = 0; (*table) [i].cond; i++)
|
|
|
1157 {
|
|
|
1158 unsigned int match = LIB$MATCH_COND (&sigargs [1], &(*table) [i].cond);
|
|
|
1159 const struct cond_subtests *subtests = (*table) [i].subtests;
|
|
|
1160
|
|
|
1161 if (match)
|
|
|
1162 {
|
|
|
1163 if (!subtests)
|
|
|
1164 {
|
|
|
1165 return &(*table) [i];
|
|
|
1166 }
|
|
|
1167 else
|
|
|
1168 {
|
|
|
1169 unsigned int ii;
|
|
|
1170 int num = (*subtests).num;
|
|
|
1171
|
|
|
1172 /* Perform subtests to differentiate exception. */
|
|
|
1173 for (ii = 0; ii < num; ii++)
|
|
|
1174 {
|
|
|
1175 unsigned int arg = (*subtests).sigargs [ii].sigarg;
|
|
|
1176 unsigned int argval = (*subtests).sigargs [ii].sigargval;
|
|
|
1177
|
|
|
1178 if (sigargs [arg] != argval)
|
|
|
1179 {
|
|
|
1180 num = 0;
|
|
|
1181 break;
|
|
|
1182 }
|
|
|
1183 }
|
|
|
1184
|
|
|
1185 /* All subtests passed. */
|
|
|
1186 if (num == (*subtests).num)
|
|
|
1187 return &(*table) [i];
|
|
|
1188 }
|
|
|
1189 }
|
|
|
1190 }
|
|
|
1191
|
|
|
1192 /* No match, return the null terminating entry. */
|
|
|
1193 return &(*table) [i];
|
|
|
1194 }
|
|
|
1195
|
|
|
1196 /* __gnat_handle_vms_condtition is both a frame based handler
|
|
|
1197 for the runtime, and an exception vector for the compiler. */
|
|
|
1198 long
|
|
|
1199 __gnat_handle_vms_condition (int *sigargs, void *mechargs)
|
|
|
1200 {
|
|
|
1201 struct Exception_Data *exception = 0;
|
|
|
1202 unsigned int needs_adjust = 0;
|
|
|
1203 void *base_code;
|
|
|
1204 struct descriptor_s gnat_facility = {4, 0, "GNAT"};
|
|
|
1205 char message [Default_Exception_Msg_Max_Length];
|
|
|
1206
|
|
|
1207 const char *msg = "";
|
|
|
1208
|
|
|
1209 /* Check for conditions to resignal which aren't effected by pragma
|
|
|
1210 Import_Exception. */
|
|
|
1211 if (__gnat_resignal_p (sigargs [1]))
|
|
|
1212 return SS$_RESIGNAL;
|
|
|
1213 #ifndef IN_RTS
|
|
|
1214 /* toplev.c handles this for compiler. */
|
|
|
1215 if (sigargs [1] == SS$_HPARITH)
|
|
|
1216 return SS$_RESIGNAL;
|
|
|
1217 #endif
|
|
|
1218
|
|
|
1219 #ifdef IN_RTS
|
|
|
1220 /* See if it's an imported exception. Beware that registered exceptions
|
|
|
1221 are bound to their base code, with the severity bits masked off. */
|
|
|
1222 base_code = Base_Code_In ((void *) sigargs[1]);
|
|
|
1223 exception = Coded_Exception (base_code);
|
|
|
1224 #endif
|
|
|
1225
|
|
|
1226 if (exception == 0)
|
|
|
1227 #ifdef IN_RTS
|
|
|
1228 {
|
|
|
1229 int i;
|
|
|
1230 struct cond_except cond;
|
|
|
1231 const struct cond_except *cond_table;
|
|
|
1232 const struct cond_except *cond_tables [] = {dec_ada_cond_except_table,
|
|
|
1233 system_cond_except_table,
|
|
|
1234 0};
|
|
|
1235 unsigned int ctrlc = SS$_CONTROLC;
|
|
|
1236 unsigned int *sigint = &C$_SIGINT;
|
|
|
1237 int ctrlc_match = LIB$MATCH_COND (&sigargs [1], &ctrlc);
|
|
|
1238 int sigint_match = LIB$MATCH_COND (&sigargs [1], &sigint);
|
|
|
1239
|
|
|
1240 extern int SYS$DCLAST (void (*astadr)(), unsigned long long astprm,
|
|
|
1241 unsigned int acmode);
|
|
|
1242
|
|
|
1243 /* If SS$_CONTROLC has been imported as an exception, it will take
|
|
|
1244 priority over a Ctrl/C handler. See above. SIGINT has a
|
|
|
1245 different condition value due to it's DECCCRTL roots and it's
|
|
|
1246 the condition that gets raised for a "kill -INT". */
|
|
|
1247 if ((ctrlc_match || sigint_match) && __gnat_ctrl_c_handler)
|
|
|
1248 {
|
|
|
1249 SYS$DCLAST (__gnat_ctrl_c_handler, 0, 0);
|
|
|
1250 return SS$_CONTINUE;
|
|
|
1251 }
|
|
|
1252
|
|
|
1253 i = 0;
|
|
|
1254 while ((cond_table = cond_tables[i++]) && !exception)
|
|
|
1255 {
|
|
|
1256 cond = *scan_conditions (sigargs, &cond_table);
|
|
|
1257 exception = (struct Exception_Data *) cond.except;
|
|
|
1258 }
|
|
|
1259
|
|
|
1260 if (exception)
|
|
|
1261 needs_adjust = cond.needs_adjust;
|
|
|
1262 else
|
|
|
1263 /* User programs expect Non_Ada_Error to be raised if no match,
|
|
|
1264 reference DEC Ada test CXCONDHAN. */
|
|
|
1265 exception = &Non_Ada_Error;
|
|
|
1266 }
|
|
|
1267 #else
|
|
|
1268 {
|
|
|
1269 /* Pretty much everything is just a program error in the compiler */
|
|
|
1270 exception = &program_error;
|
|
|
1271 }
|
|
|
1272 #endif
|
|
|
1273
|
|
|
1274 message[0] = 0;
|
|
|
1275 /* Subtract PC & PSL fields as per ABI for SYS$PUTMSG. */
|
|
|
1276 sigargs[0] -= 2;
|
|
|
1277
|
|
|
1278 extern int SYS$PUTMSG (void *, int (*)(), void *, unsigned long long);
|
|
|
1279
|
|
|
1280 /* If it was a DEC Ada specific condtiion, make it GNAT otherwise
|
|
|
1281 keep the old facility. */
|
|
131
|
1282 if ((sigargs [1] & FAC_MASK) == DECADA_M_FACILITY)
|
|
111
|
1283 SYS$PUTMSG (sigargs, copy_msg, &gnat_facility,
|
|
|
1284 (unsigned long long ) message);
|
|
|
1285 else
|
|
|
1286 SYS$PUTMSG (sigargs, copy_msg, 0,
|
|
|
1287 (unsigned long long ) message);
|
|
|
1288
|
|
|
1289 /* Add back PC & PSL fields as per ABI for SYS$PUTMSG. */
|
|
|
1290 sigargs[0] += 2;
|
|
|
1291 msg = message;
|
|
|
1292
|
|
|
1293 if (needs_adjust)
|
|
|
1294 __gnat_adjust_context_for_raise (sigargs [1], (void *)mechargs);
|
|
|
1295
|
|
|
1296 Raise_From_Signal_Handler (exception, msg);
|
|
|
1297 }
|
|
|
1298
|
|
|
1299 #if defined (IN_RTS) && defined (__IA64)
|
|
|
1300 /* Called only from adasigio.b32. This is a band aid to avoid going
|
|
|
1301 through the VMS signal handling code which results in a 0x8000 per
|
|
|
1302 handled exception memory leak in P2 space (see VMS source listing
|
|
|
1303 sys/lis/exception.lis) due to the allocation of working space that
|
|
|
1304 is expected to be deallocated upon return from the condition handler,
|
|
|
1305 which doesn't return in GNAT compiled code. */
|
|
|
1306 void
|
|
|
1307 GNAT$STOP (int *sigargs)
|
|
|
1308 {
|
|
|
1309 /* Note that there are no mechargs. We rely on the fact that condtions
|
|
|
1310 raised from DEClib I/O do not require an "adjust". Also the count
|
|
|
1311 will be off by 2, since LIB$STOP didn't get a chance to add the
|
|
|
1312 PC and PSL fields, so we bump it so PUTMSG comes out right. */
|
|
|
1313 sigargs [0] += 2;
|
|
|
1314 __gnat_handle_vms_condition (sigargs, 0);
|
|
|
1315 }
|
|
|
1316 #endif
|
|
|
1317
|
|
|
1318 void
|
|
|
1319 __gnat_install_handler (void)
|
|
|
1320 {
|
|
|
1321 long prvhnd ATTRIBUTE_UNUSED;
|
|
|
1322
|
|
|
1323 #if !defined (IN_RTS)
|
|
|
1324 extern int SYS$SETEXV (unsigned int vector, int (*addres)(),
|
|
|
1325 unsigned int accmode, void *(*(prvhnd)));
|
|
|
1326 SYS$SETEXV (1, __gnat_handle_vms_condition, 3, &prvhnd);
|
|
|
1327 #endif
|
|
|
1328
|
|
|
1329 __gnat_handler_installed = 1;
|
|
|
1330 }
|
|
|
1331
|
|
|
1332 /* __gnat_adjust_context_for_raise for Alpha - see comments along with the
|
|
|
1333 default version later in this file. */
|
|
|
1334
|
|
|
1335 #if defined (IN_RTS) && defined (__alpha__)
|
|
|
1336
|
|
|
1337 #include <vms/chfctxdef.h>
|
|
|
1338 #include <vms/chfdef.h>
|
|
|
1339
|
|
|
1340 #define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
1341
|
|
|
1342 void
|
|
|
1343 __gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED, void *ucontext)
|
|
|
1344 {
|
|
|
1345 if (signo == SS$_HPARITH)
|
|
|
1346 {
|
|
|
1347 /* Sub one to the address of the instruction signaling the condition,
|
|
|
1348 located in the sigargs array. */
|
|
|
1349
|
|
|
1350 CHF$MECH_ARRAY * mechargs = (CHF$MECH_ARRAY *) ucontext;
|
|
|
1351 CHF$SIGNAL_ARRAY * sigargs
|
|
|
1352 = (CHF$SIGNAL_ARRAY *) mechargs->chf$q_mch_sig_addr;
|
|
|
1353
|
|
|
1354 int vcount = sigargs->chf$is_sig_args;
|
|
|
1355 int * pc_slot = & (&sigargs->chf$l_sig_name)[vcount-2];
|
|
|
1356
|
|
|
1357 (*pc_slot)--;
|
|
|
1358 }
|
|
|
1359 }
|
|
|
1360
|
|
|
1361 #endif
|
|
|
1362
|
|
|
1363 /* __gnat_adjust_context_for_raise for ia64. */
|
|
|
1364
|
|
|
1365 #if defined (IN_RTS) && defined (__IA64)
|
|
|
1366
|
|
|
1367 #include <vms/chfctxdef.h>
|
|
|
1368 #include <vms/chfdef.h>
|
|
|
1369
|
|
|
1370 #define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
1371
|
|
|
1372 typedef unsigned long long u64;
|
|
|
1373
|
|
|
1374 void
|
|
|
1375 __gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED, void *ucontext)
|
|
|
1376 {
|
|
|
1377 /* Add one to the address of the instruction signaling the condition,
|
|
|
1378 located in the 64bits sigargs array. */
|
|
|
1379
|
|
|
1380 CHF$MECH_ARRAY * mechargs = (CHF$MECH_ARRAY *) ucontext;
|
|
|
1381
|
|
|
1382 CHF64$SIGNAL_ARRAY *chfsig64
|
|
|
1383 = (CHF64$SIGNAL_ARRAY *) mechargs->chf$ph_mch_sig64_addr;
|
|
|
1384
|
|
|
1385 u64 * post_sigarray
|
|
|
1386 = (u64 *)chfsig64 + 1 + chfsig64->chf64$l_sig_args;
|
|
|
1387
|
|
|
1388 u64 * ih_pc_loc = post_sigarray - 2;
|
|
|
1389
|
|
|
1390 (*ih_pc_loc) ++;
|
|
|
1391 }
|
|
|
1392
|
|
|
1393 #endif
|
|
|
1394
|
|
|
1395 /* Easier interface for LIB$GET_LOGICAL: put the equivalence of NAME into BUF,
|
|
|
1396 always NUL terminated. In case of error or if the result is longer than
|
|
|
1397 LEN (length of BUF) an empty string is written info BUF. */
|
|
|
1398
|
|
|
1399 static void
|
|
|
1400 __gnat_vms_get_logical (const char *name, char *buf, int len)
|
|
|
1401 {
|
|
|
1402 struct descriptor_s name_desc, result_desc;
|
|
|
1403 int status;
|
|
|
1404 unsigned short rlen;
|
|
|
1405
|
|
|
1406 /* Build the descriptor for NAME. */
|
|
|
1407 name_desc.len = strlen (name);
|
|
|
1408 name_desc.mbz = 0;
|
|
|
1409 name_desc.adr = (char *)name;
|
|
|
1410
|
|
|
1411 /* Build the descriptor for the result. */
|
|
|
1412 result_desc.len = len;
|
|
|
1413 result_desc.mbz = 0;
|
|
|
1414 result_desc.adr = buf;
|
|
|
1415
|
|
|
1416 status = LIB$GET_LOGICAL (&name_desc, &result_desc, &rlen);
|
|
|
1417
|
|
|
1418 if ((status & 1) == 1 && rlen < len)
|
|
|
1419 buf[rlen] = 0;
|
|
|
1420 else
|
|
|
1421 buf[0] = 0;
|
|
|
1422 }
|
|
|
1423
|
|
|
1424 /* Size of a page on ia64 and alpha VMS. */
|
|
|
1425 #define VMS_PAGESIZE 8192
|
|
|
1426
|
|
|
1427 /* User mode. */
|
|
|
1428 #define PSL__C_USER 3
|
|
|
1429
|
|
|
1430 /* No access. */
|
|
|
1431 #define PRT__C_NA 0
|
|
|
1432
|
|
|
1433 /* Descending region. */
|
|
|
1434 #define VA__M_DESCEND 1
|
|
|
1435
|
|
|
1436 /* Get by virtual address. */
|
|
|
1437 #define VA___REGSUM_BY_VA 1
|
|
|
1438
|
|
|
1439 /* Memory region summary. */
|
|
|
1440 struct regsum
|
|
|
1441 {
|
|
|
1442 unsigned long long q_region_id;
|
|
|
1443 unsigned int l_flags;
|
|
|
1444 unsigned int l_region_protection;
|
|
|
1445 void *pq_start_va;
|
|
|
1446 unsigned long long q_region_size;
|
|
|
1447 void *pq_first_free_va;
|
|
|
1448 };
|
|
|
1449
|
|
|
1450 extern int SYS$GET_REGION_INFO (unsigned int, unsigned long long *,
|
|
|
1451 void *, void *, unsigned int,
|
|
|
1452 void *, unsigned int *);
|
|
|
1453 extern int SYS$EXPREG_64 (unsigned long long *, unsigned long long,
|
|
|
1454 unsigned int, unsigned int, void **,
|
|
|
1455 unsigned long long *);
|
|
|
1456 extern int SYS$SETPRT_64 (void *, unsigned long long, unsigned int,
|
|
|
1457 unsigned int, void **, unsigned long long *,
|
|
|
1458 unsigned int *);
|
|
|
1459
|
|
|
1460 /* Add a guard page in the memory region containing ADDR at ADDR +/- SIZE.
|
|
|
1461 (The sign depends on the kind of the memory region). */
|
|
|
1462
|
|
|
1463 static int
|
|
|
1464 __gnat_set_stack_guard_page (void *addr, unsigned long size)
|
|
|
1465 {
|
|
|
1466 int status;
|
|
|
1467 void *ret_va;
|
|
|
1468 unsigned long long ret_len;
|
|
|
1469 unsigned int ret_prot;
|
|
|
1470 void *start_va;
|
|
|
1471 unsigned long long length;
|
|
|
1472 unsigned int retlen;
|
|
|
1473 struct regsum buffer;
|
|
|
1474
|
|
|
1475 /* Get the region for ADDR. */
|
|
|
1476 status = SYS$GET_REGION_INFO
|
|
|
1477 (VA___REGSUM_BY_VA, NULL, addr, NULL, sizeof (buffer), &buffer, &retlen);
|
|
|
1478
|
|
|
1479 if ((status & 1) != 1)
|
|
|
1480 return -1;
|
|
|
1481
|
|
|
1482 /* Extend the region. */
|
|
|
1483 status = SYS$EXPREG_64 (&buffer.q_region_id,
|
|
|
1484 size, 0, 0, &start_va, &length);
|
|
|
1485
|
|
|
1486 if ((status & 1) != 1)
|
|
|
1487 return -1;
|
|
|
1488
|
|
|
1489 /* Create a guard page. */
|
|
|
1490 if (!(buffer.l_flags & VA__M_DESCEND))
|
|
|
1491 start_va = (void *)((unsigned long long)start_va + length - VMS_PAGESIZE);
|
|
|
1492
|
|
|
1493 status = SYS$SETPRT_64 (start_va, VMS_PAGESIZE, PSL__C_USER, PRT__C_NA,
|
|
|
1494 &ret_va, &ret_len, &ret_prot);
|
|
|
1495
|
|
|
1496 if ((status & 1) != 1)
|
|
|
1497 return -1;
|
|
|
1498 return 0;
|
|
|
1499 }
|
|
|
1500
|
|
|
1501 /* Read logicals to limit the stack(s) size. */
|
|
|
1502
|
|
|
1503 static void
|
|
|
1504 __gnat_set_stack_limit (void)
|
|
|
1505 {
|
|
|
1506 #ifdef __ia64__
|
|
|
1507 void *sp;
|
|
|
1508 unsigned long size;
|
|
|
1509 char value[16];
|
|
|
1510 char *e;
|
|
|
1511
|
|
|
1512 /* The main stack. */
|
|
|
1513 __gnat_vms_get_logical ("GNAT_STACK_SIZE", value, sizeof (value));
|
|
|
1514 size = strtoul (value, &e, 0);
|
|
|
1515 if (e > value && *e == 0)
|
|
|
1516 {
|
|
|
1517 asm ("mov %0=sp" : "=r" (sp));
|
|
|
1518 __gnat_set_stack_guard_page (sp, size * 1024);
|
|
|
1519 }
|
|
|
1520
|
|
|
1521 /* The register stack. */
|
|
|
1522 __gnat_vms_get_logical ("GNAT_RBS_SIZE", value, sizeof (value));
|
|
|
1523 size = strtoul (value, &e, 0);
|
|
|
1524 if (e > value && *e == 0)
|
|
|
1525 {
|
|
|
1526 asm ("mov %0=ar.bsp" : "=r" (sp));
|
|
|
1527 __gnat_set_stack_guard_page (sp, size * 1024);
|
|
|
1528 }
|
|
|
1529 #endif
|
|
|
1530 }
|
|
|
1531
|
|
|
1532 #ifdef IN_RTS
|
|
|
1533 extern int SYS$IEEE_SET_FP_CONTROL (void *, void *, void *);
|
|
|
1534 #define K_TRUE 1
|
|
|
1535 #define __int64 long long
|
|
|
1536 #define __NEW_STARLET
|
|
|
1537 #include <vms/ieeedef.h>
|
|
|
1538 #endif
|
|
|
1539
|
|
|
1540 /* Feature logical name and global variable address pair.
|
|
|
1541 If we ever add another feature logical to this list, the
|
|
|
1542 feature struct will need to be enhanced to take into account
|
|
|
1543 possible values for *gl_addr. */
|
|
|
1544 struct feature {
|
|
|
1545 const char *name;
|
|
|
1546 int *gl_addr;
|
|
|
1547 };
|
|
|
1548
|
|
|
1549 /* Default values for GNAT features set by environment or binder. */
|
|
|
1550 int __gl_heap_size = 64;
|
|
|
1551
|
|
|
1552 /* Default float format is 'I' meaning IEEE. If gnatbind detetcts that a
|
|
|
1553 VAX Float format is specified, it will set this global variable to 'V'.
|
|
|
1554 Subsequently __gnat_set_features will test the variable and if set for
|
|
|
1555 VAX Float will call a Starlet function to enable trapping for invalid
|
|
|
1556 operation, drivide by zero, and overflow. This will prevent the VMS runtime
|
|
|
1557 (specifically OTS$CHECK_FP_MODE) from complaining about inconsistent
|
|
|
1558 floating point settings in a mixed language program. Ideally the setting
|
|
|
1559 would be determined at link time based on setttings in the object files,
|
|
|
1560 however the VMS linker seems to take the setting from the first object
|
|
|
1561 in the link, e.g. pcrt0.o which is float representation neutral. */
|
|
|
1562 char __gl_float_format = 'I';
|
|
|
1563
|
|
|
1564 /* Array feature logical names and global variable addresses. */
|
|
|
1565 static const struct feature features[] =
|
|
|
1566 {
|
|
|
1567 {"GNAT$NO_MALLOC_64", &__gl_heap_size},
|
|
|
1568 {0, 0}
|
|
|
1569 };
|
|
|
1570
|
|
|
1571 void
|
|
|
1572 __gnat_set_features (void)
|
|
|
1573 {
|
|
|
1574 int i;
|
|
|
1575 char buff[16];
|
|
|
1576 #ifdef IN_RTS
|
|
|
1577 IEEE clrmsk, setmsk, prvmsk;
|
|
|
1578
|
|
|
1579 clrmsk.ieee$q_flags = 0LL;
|
|
|
1580 setmsk.ieee$q_flags = 0LL;
|
|
|
1581 #endif
|
|
|
1582
|
|
|
1583 /* Loop through features array and test name for enable/disable. */
|
|
|
1584 for (i = 0; features[i].name; i++)
|
|
|
1585 {
|
|
|
1586 __gnat_vms_get_logical (features[i].name, buff, sizeof (buff));
|
|
|
1587
|
|
|
1588 if (strcmp (buff, "ENABLE") == 0
|
|
|
1589 || strcmp (buff, "TRUE") == 0
|
|
|
1590 || strcmp (buff, "1") == 0)
|
|
|
1591 *features[i].gl_addr = 32;
|
|
|
1592 else if (strcmp (buff, "DISABLE") == 0
|
|
|
1593 || strcmp (buff, "FALSE") == 0
|
|
|
1594 || strcmp (buff, "0") == 0)
|
|
|
1595 *features[i].gl_addr = 64;
|
|
|
1596 }
|
|
|
1597
|
|
|
1598 /* Features to artificially limit the stack size. */
|
|
|
1599 __gnat_set_stack_limit ();
|
|
|
1600
|
|
|
1601 #ifdef IN_RTS
|
|
|
1602 if (__gl_float_format == 'V')
|
|
|
1603 {
|
|
|
1604 setmsk.ieee$v_trap_enable_inv = K_TRUE;
|
|
|
1605 setmsk.ieee$v_trap_enable_dze = K_TRUE;
|
|
|
1606 setmsk.ieee$v_trap_enable_ovf = K_TRUE;
|
|
|
1607 SYS$IEEE_SET_FP_CONTROL (&clrmsk, &setmsk, &prvmsk);
|
|
|
1608 }
|
|
|
1609 #endif
|
|
|
1610
|
|
|
1611 __gnat_features_set = 1;
|
|
|
1612 }
|
|
|
1613
|
|
|
1614 /* Return true if the VMS version is 7.x. */
|
|
|
1615
|
|
|
1616 extern unsigned int LIB$GETSYI (int *, ...);
|
|
|
1617
|
|
|
1618 #define SYI$_VERSION 0x1000
|
|
|
1619
|
|
|
1620 int
|
|
|
1621 __gnat_is_vms_v7 (void)
|
|
|
1622 {
|
|
|
1623 struct descriptor_s desc;
|
|
|
1624 char version[8];
|
|
|
1625 int status;
|
|
|
1626 int code = SYI$_VERSION;
|
|
|
1627
|
|
|
1628 desc.len = sizeof (version);
|
|
|
1629 desc.mbz = 0;
|
|
|
1630 desc.adr = version;
|
|
|
1631
|
|
|
1632 status = LIB$GETSYI (&code, 0, &desc);
|
|
|
1633 if ((status & 1) == 1 && version[1] == '7' && version[2] == '.')
|
|
|
1634 return 1;
|
|
|
1635 else
|
|
|
1636 return 0;
|
|
|
1637 }
|
|
|
1638
|
|
|
1639 /*******************/
|
|
|
1640 /* FreeBSD Section */
|
|
|
1641 /*******************/
|
|
|
1642
|
|
|
1643 #elif defined (__FreeBSD__) || defined (__DragonFly__)
|
|
|
1644
|
|
|
1645 #include <signal.h>
|
|
|
1646 #include <sys/ucontext.h>
|
|
|
1647 #include <unistd.h>
|
|
|
1648
|
|
|
1649 static void
|
|
|
1650 __gnat_error_handler (int sig,
|
|
|
1651 siginfo_t *si ATTRIBUTE_UNUSED,
|
|
|
1652 void *ucontext ATTRIBUTE_UNUSED)
|
|
|
1653 {
|
|
|
1654 struct Exception_Data *exception;
|
|
|
1655 const char *msg;
|
|
|
1656
|
|
|
1657 switch (sig)
|
|
|
1658 {
|
|
|
1659 case SIGFPE:
|
|
|
1660 exception = &constraint_error;
|
|
|
1661 msg = "SIGFPE";
|
|
|
1662 break;
|
|
|
1663
|
|
|
1664 case SIGILL:
|
|
|
1665 exception = &constraint_error;
|
|
|
1666 msg = "SIGILL";
|
|
|
1667 break;
|
|
|
1668
|
|
|
1669 case SIGSEGV:
|
|
|
1670 exception = &storage_error;
|
|
|
1671 msg = "stack overflow or erroneous memory access";
|
|
|
1672 break;
|
|
|
1673
|
|
|
1674 case SIGBUS:
|
|
|
1675 exception = &storage_error;
|
|
|
1676 msg = "SIGBUS: possible stack overflow";
|
|
|
1677 break;
|
|
|
1678
|
|
|
1679 default:
|
|
|
1680 exception = &program_error;
|
|
|
1681 msg = "unhandled signal";
|
|
|
1682 }
|
|
|
1683
|
|
|
1684 Raise_From_Signal_Handler (exception, msg);
|
|
|
1685 }
|
|
|
1686
|
|
|
1687 void
|
|
|
1688 __gnat_install_handler (void)
|
|
|
1689 {
|
|
|
1690 struct sigaction act;
|
|
|
1691
|
|
|
1692 /* Set up signal handler to map synchronous signals to appropriate
|
|
|
1693 exceptions. Make sure that the handler isn't interrupted by another
|
|
|
1694 signal that might cause a scheduling event! */
|
|
|
1695
|
|
|
1696 act.sa_sigaction
|
|
|
1697 = (void (*)(int, struct __siginfo *, void*)) __gnat_error_handler;
|
|
|
1698 act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
|
1699 (void) sigemptyset (&act.sa_mask);
|
|
|
1700
|
|
|
1701 (void) sigaction (SIGILL, &act, NULL);
|
|
|
1702 (void) sigaction (SIGFPE, &act, NULL);
|
|
|
1703 (void) sigaction (SIGSEGV, &act, NULL);
|
|
|
1704 (void) sigaction (SIGBUS, &act, NULL);
|
|
|
1705
|
|
|
1706 __gnat_handler_installed = 1;
|
|
|
1707 }
|
|
|
1708
|
|
|
1709 /*************************************/
|
|
|
1710 /* VxWorks Section (including Vx653) */
|
|
|
1711 /*************************************/
|
|
|
1712
|
|
|
1713 #elif defined(__vxworks)
|
|
|
1714
|
|
|
1715 #include <signal.h>
|
|
|
1716 #include <taskLib.h>
|
|
|
1717 #if (defined (__i386__) || defined (__x86_64__)) && !defined (VTHREADS)
|
|
|
1718 #include <sysLib.h>
|
|
|
1719 #endif
|
|
|
1720
|
|
|
1721 #include "sigtramp.h"
|
|
|
1722
|
|
|
1723 #ifndef __RTP__
|
|
|
1724 #include <intLib.h>
|
|
|
1725 #include <iv.h>
|
|
|
1726 #endif
|
|
|
1727
|
|
|
1728 #if ((defined (ARMEL) && (_WRS_VXWORKS_MAJOR == 6)) || defined (__x86_64__)) && !defined(__RTP__)
|
|
|
1729 #define VXWORKS_FORCE_GUARD_PAGE 1
|
|
|
1730 #include <vmLib.h>
|
|
|
1731 extern size_t vxIntStackOverflowSize;
|
|
|
1732 #define INT_OVERFLOW_SIZE vxIntStackOverflowSize
|
|
|
1733 #endif
|
|
|
1734
|
|
|
1735 #ifdef VTHREADS
|
|
|
1736 #include "private/vThreadsP.h"
|
|
|
1737 #endif
|
|
|
1738
|
|
|
1739 #ifndef __RTP__
|
|
|
1740
|
|
|
1741 /* Directly vectored Interrupt routines are not supported when using RTPs. */
|
|
|
1742
|
|
|
1743 extern void * __gnat_inum_to_ivec (int);
|
|
|
1744
|
|
|
1745 /* This is needed by the GNAT run time to handle Vxworks interrupts. */
|
|
|
1746 void *
|
|
|
1747 __gnat_inum_to_ivec (int num)
|
|
|
1748 {
|
|
|
1749 return (void *) INUM_TO_IVEC (num);
|
|
|
1750 }
|
|
|
1751 #endif
|
|
|
1752
|
|
|
1753 #if !defined(__alpha_vxworks) && ((_WRS_VXWORKS_MAJOR != 6) && (_WRS_VXWORKS_MAJOR != 7)) && !defined(__RTP__)
|
|
|
1754
|
|
|
1755 /* getpid is used by s-parint.adb, but is not defined by VxWorks, except
|
|
|
1756 on Alpha VxWorks and VxWorks 6.x (including RTPs). */
|
|
|
1757
|
|
|
1758 extern long getpid (void);
|
|
|
1759
|
|
|
1760 long
|
|
|
1761 getpid (void)
|
|
|
1762 {
|
|
|
1763 return taskIdSelf ();
|
|
|
1764 }
|
|
|
1765 #endif
|
|
|
1766
|
|
|
1767 /* When stack checking is performed by probing a guard page on the stack,
|
|
|
1768 sometimes this guard page is not properly reset on VxWorks. We need to
|
|
|
1769 manually reset it in this case.
|
|
|
1770 This function returns TRUE in case the guard page was hit by the
|
|
|
1771 signal. */
|
|
|
1772 static int
|
|
|
1773 __gnat_reset_guard_page (int sig)
|
|
|
1774 {
|
|
|
1775 /* On ARM VxWorks 6.x and x86_64 VxWorks 7, the guard page is left un-armed
|
|
|
1776 by the kernel after being violated, so subsequent violations aren't
|
|
|
1777 detected.
|
|
|
1778 So we retrieve the address of the guard page from the TCB and compare it
|
|
|
1779 with the page that is violated and re-arm that page if there's a match. */
|
|
|
1780 #if defined (VXWORKS_FORCE_GUARD_PAGE)
|
|
|
1781
|
|
|
1782 /* Ignore signals that are not stack overflow signals */
|
|
|
1783 if (sig != SIGSEGV && sig != SIGBUS && sig != SIGILL) return FALSE;
|
|
|
1784
|
|
|
1785 /* If the target does not support guard pages, INT_OVERFLOW_SIZE will be 0 */
|
|
|
1786 if (INT_OVERFLOW_SIZE == 0) return FALSE;
|
|
|
1787
|
|
|
1788 TASK_ID tid = taskIdSelf ();
|
|
|
1789 WIND_TCB *pTcb = taskTcb (tid);
|
|
|
1790 VIRT_ADDR guardPage = (VIRT_ADDR) pTcb->pStackEnd - INT_OVERFLOW_SIZE;
|
|
|
1791 UINT stateMask = VM_STATE_MASK_VALID;
|
|
|
1792 UINT guardState = VM_STATE_VALID_NOT;
|
|
|
1793
|
|
|
1794 #if (_WRS_VXWORKS_MAJOR >= 7)
|
|
|
1795 stateMask |= MMU_ATTR_SPL_MSK;
|
|
|
1796 guardState |= MMU_ATTR_NO_BLOCK;
|
|
|
1797 #endif
|
|
|
1798
|
|
|
1799 UINT nState;
|
|
|
1800 vmStateGet (NULL, guardPage, &nState);
|
|
|
1801 if ((nState & VM_STATE_MASK_VALID) != VM_STATE_VALID_NOT)
|
|
|
1802 {
|
|
|
1803 /* If the guard page has a valid state, we need to reset to
|
|
|
1804 invalid state here */
|
|
|
1805 vmStateSet (NULL, guardPage, INT_OVERFLOW_SIZE, stateMask, guardState);
|
|
|
1806 return TRUE;
|
|
|
1807 }
|
|
|
1808 #endif /* VXWORKS_FORCE_GUARD_PAGE */
|
|
|
1809 return FALSE;
|
|
|
1810 }
|
|
|
1811
|
|
|
1812 /* VxWorks 653 vThreads expects the field excCnt to be zeroed when a signal is.
|
|
|
1813 handled. The VxWorks version of longjmp does this; GCC's builtin_longjmp
|
|
|
1814 doesn't. */
|
|
|
1815 void
|
|
|
1816 __gnat_clear_exception_count (void)
|
|
|
1817 {
|
|
|
1818 #ifdef VTHREADS
|
|
|
1819 WIND_TCB *currentTask = (WIND_TCB *) taskIdSelf();
|
|
|
1820
|
|
|
1821 currentTask->vThreads.excCnt = 0;
|
|
|
1822 #endif
|
|
|
1823 }
|
|
|
1824
|
|
|
1825 /* Handle different SIGnal to exception mappings in different VxWorks
|
|
|
1826 versions. */
|
|
|
1827 void
|
|
|
1828 __gnat_map_signal (int sig,
|
|
|
1829 siginfo_t *si ATTRIBUTE_UNUSED,
|
|
|
1830 void *sc ATTRIBUTE_UNUSED)
|
|
|
1831 {
|
|
|
1832 struct Exception_Data *exception;
|
|
|
1833 const char *msg;
|
|
|
1834
|
|
|
1835 switch (sig)
|
|
|
1836 {
|
|
|
1837 case SIGFPE:
|
|
|
1838 exception = &constraint_error;
|
|
|
1839 msg = "SIGFPE";
|
|
|
1840 break;
|
|
|
1841 #ifdef VTHREADS
|
|
|
1842 #ifdef __VXWORKSMILS__
|
|
|
1843 case SIGILL:
|
|
|
1844 exception = &storage_error;
|
|
|
1845 msg = "SIGILL: possible stack overflow";
|
|
|
1846 break;
|
|
|
1847 case SIGSEGV:
|
|
|
1848 exception = &storage_error;
|
|
|
1849 msg = "SIGSEGV";
|
|
|
1850 break;
|
|
|
1851 case SIGBUS:
|
|
|
1852 exception = &program_error;
|
|
|
1853 msg = "SIGBUS";
|
|
|
1854 break;
|
|
|
1855 #else
|
|
|
1856 case SIGILL:
|
|
|
1857 exception = &constraint_error;
|
|
|
1858 msg = "Floating point exception or SIGILL";
|
|
|
1859 break;
|
|
|
1860 case SIGSEGV:
|
|
|
1861 exception = &storage_error;
|
|
|
1862 msg = "SIGSEGV";
|
|
|
1863 break;
|
|
|
1864 case SIGBUS:
|
|
|
1865 exception = &storage_error;
|
|
|
1866 msg = "SIGBUS: possible stack overflow";
|
|
|
1867 break;
|
|
|
1868 #endif
|
|
|
1869 #elif (_WRS_VXWORKS_MAJOR >= 6)
|
|
|
1870 case SIGILL:
|
|
|
1871 exception = &constraint_error;
|
|
|
1872 msg = "SIGILL";
|
|
|
1873 break;
|
|
|
1874 #ifdef __RTP__
|
|
|
1875 /* In RTP mode a SIGSEGV is most likely due to a stack overflow,
|
|
|
1876 since stack checking uses the probing mechanism. */
|
|
|
1877 case SIGSEGV:
|
|
|
1878 exception = &storage_error;
|
|
|
1879 msg = "SIGSEGV: possible stack overflow";
|
|
|
1880 break;
|
|
|
1881 case SIGBUS:
|
|
|
1882 exception = &program_error;
|
|
|
1883 msg = "SIGBUS";
|
|
|
1884 break;
|
|
|
1885 #else
|
|
|
1886 /* VxWorks 6 kernel mode with probing. SIGBUS for guard page hit */
|
|
|
1887 case SIGSEGV:
|
|
|
1888 exception = &storage_error;
|
|
|
1889 msg = "SIGSEGV";
|
|
|
1890 break;
|
|
|
1891 case SIGBUS:
|
|
|
1892 exception = &storage_error;
|
|
|
1893 msg = "SIGBUS: possible stack overflow";
|
|
|
1894 break;
|
|
|
1895 #endif
|
|
|
1896 #else
|
|
|
1897 /* VxWorks 5: a SIGILL is most likely due to a stack overflow,
|
|
|
1898 since stack checking uses the stack limit mechanism. */
|
|
|
1899 case SIGILL:
|
|
|
1900 exception = &storage_error;
|
|
|
1901 msg = "SIGILL: possible stack overflow";
|
|
|
1902 break;
|
|
|
1903 case SIGSEGV:
|
|
|
1904 exception = &storage_error;
|
|
|
1905 msg = "SIGSEGV";
|
|
|
1906 break;
|
|
|
1907 case SIGBUS:
|
|
|
1908 exception = &program_error;
|
|
|
1909 msg = "SIGBUS";
|
|
|
1910 break;
|
|
|
1911 #endif
|
|
|
1912 default:
|
|
|
1913 exception = &program_error;
|
|
|
1914 msg = "unhandled signal";
|
|
|
1915 }
|
|
|
1916
|
|
|
1917 if (__gnat_reset_guard_page (sig))
|
|
|
1918 {
|
|
|
1919 /* Set the exception message: we know for sure that we have a
|
|
|
1920 stack overflow here */
|
|
|
1921 exception = &storage_error;
|
|
|
1922
|
|
|
1923 switch (sig)
|
|
|
1924 {
|
|
|
1925 case SIGSEGV:
|
|
|
1926 msg = "SIGSEGV: stack overflow";
|
|
|
1927 break;
|
|
|
1928 case SIGBUS:
|
|
|
1929 msg = "SIGBUS: stack overflow";
|
|
|
1930 break;
|
|
|
1931 case SIGILL:
|
|
|
1932 msg = "SIGILL: stack overflow";
|
|
|
1933 break;
|
|
|
1934 }
|
|
|
1935 }
|
|
|
1936 __gnat_clear_exception_count ();
|
|
|
1937 Raise_From_Signal_Handler (exception, msg);
|
|
|
1938 }
|
|
|
1939
|
|
131
|
1940 #if defined (ARMEL) && (_WRS_VXWORKS_MAJOR >= 7) && !defined (__aarch64__)
|
|
111
|
1941
|
|
|
1942 /* ARM-vx7 case with arm unwinding exceptions */
|
|
|
1943 #define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
1944
|
|
|
1945 #include <arch/../regs.h>
|
|
|
1946 #ifndef __RTP__
|
|
|
1947 #include <sigLib.h>
|
|
|
1948 #else
|
|
|
1949 #include <signal.h>
|
|
|
1950 #include <regs.h>
|
|
|
1951 #include <ucontext.h>
|
|
|
1952 #endif /* __RTP__ */
|
|
|
1953
|
|
|
1954 void
|
|
|
1955 __gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED,
|
|
|
1956 void *sc ATTRIBUTE_UNUSED)
|
|
|
1957 {
|
|
|
1958 /* In case of ARM exceptions, the registers context have the PC pointing
|
|
|
1959 to the instruction that raised the signal. However the unwinder expects
|
|
|
1960 the instruction to be in the range ]PC,PC+1]. */
|
|
|
1961 uintptr_t *pc_addr;
|
|
|
1962 #ifdef __RTP__
|
|
|
1963 mcontext_t *mcontext = &((ucontext_t *) sc)->uc_mcontext;
|
|
|
1964 pc_addr = (uintptr_t*)&mcontext->regs.pc;
|
|
|
1965 #else
|
|
|
1966 struct sigcontext * sctx = (struct sigcontext *) sc;
|
|
|
1967 pc_addr = (uintptr_t*)&sctx->sc_pregs->pc;
|
|
|
1968 #endif
|
|
|
1969 /* ARM Bump has to be an even number because of odd/even architecture. */
|
|
|
1970 *pc_addr += 2;
|
|
|
1971 }
|
|
|
1972 #endif /* ARMEL && _WRS_VXWORKS_MAJOR >= 7 */
|
|
|
1973
|
|
|
1974 /* Tasking and Non-tasking signal handler. Map SIGnal to Ada exception
|
|
|
1975 propagation after the required low level adjustments. */
|
|
|
1976
|
|
|
1977 static void
|
|
|
1978 __gnat_error_handler (int sig, siginfo_t *si, void *sc)
|
|
|
1979 {
|
|
|
1980 sigset_t mask;
|
|
|
1981
|
|
|
1982 /* VxWorks on e500v2 clears the SPE bit of the MSR when entering CPU
|
|
|
1983 exception state. To allow the handler and exception to work properly
|
|
|
1984 when they contain SPE instructions, we need to set it back before doing
|
|
|
1985 anything else.
|
|
|
1986 This mechanism is only need in kernel mode. */
|
|
|
1987 #if !(defined (__RTP__) || defined (VTHREADS)) && ((CPU == PPCE500V2) || (CPU == PPC85XX))
|
|
|
1988 register unsigned msr;
|
|
|
1989 /* Read the MSR value */
|
|
|
1990 asm volatile ("mfmsr %0" : "=r" (msr));
|
|
|
1991 /* Force the SPE bit if not set. */
|
|
|
1992 if ((msr & 0x02000000) == 0)
|
|
|
1993 {
|
|
|
1994 msr |= 0x02000000;
|
|
|
1995 /* Store to MSR */
|
|
|
1996 asm volatile ("mtmsr %0" : : "r" (msr));
|
|
|
1997 }
|
|
|
1998 #endif
|
|
|
1999
|
|
|
2000 /* VxWorks will always mask out the signal during the signal handler and
|
|
|
2001 will reenable it on a longjmp. GNAT does not generate a longjmp to
|
|
|
2002 return from a signal handler so the signal will still be masked unless
|
|
|
2003 we unmask it. */
|
|
|
2004 sigprocmask (SIG_SETMASK, NULL, &mask);
|
|
|
2005 sigdelset (&mask, sig);
|
|
|
2006 sigprocmask (SIG_SETMASK, &mask, NULL);
|
|
|
2007
|
|
131
|
2008 #if defined (__ARMEL__) || defined (__PPC__) || defined (__i386__) || defined (__x86_64__) || defined (__aarch64__)
|
|
111
|
2009 /* On certain targets, kernel mode, we process signals through a Call Frame
|
|
|
2010 Info trampoline, voiding the need for myriads of fallback_frame_state
|
|
|
2011 variants in the ZCX runtime. We have no simple way to distinguish ZCX
|
|
|
2012 from SJLJ here, so we do this for SJLJ as well even though this is not
|
|
|
2013 necessary. This only incurs a few extra instructions and a tiny
|
|
|
2014 amount of extra stack usage. */
|
|
|
2015
|
|
|
2016 #ifdef HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
2017 /* We need to sometimes to adjust the PC in case of signals so that it
|
|
|
2018 doesn't reference the exception that actually raised the signal but the
|
|
|
2019 instruction before it. */
|
|
|
2020 __gnat_adjust_context_for_raise (sig, sc);
|
|
|
2021 #endif
|
|
|
2022
|
|
|
2023 __gnat_sigtramp (sig, (void *)si, (void *)sc,
|
|
|
2024 (__sigtramphandler_t *)&__gnat_map_signal);
|
|
|
2025
|
|
|
2026 #else
|
|
|
2027 __gnat_map_signal (sig, si, sc);
|
|
|
2028 #endif
|
|
|
2029 }
|
|
|
2030
|
|
|
2031 #if defined(__leon__) && defined(_WRS_KERNEL)
|
|
|
2032 /* For LEON VxWorks we need to install a trap handler for stack overflow */
|
|
|
2033
|
|
|
2034 extern void excEnt (void);
|
|
|
2035 /* VxWorks exception handler entry */
|
|
|
2036
|
|
|
2037 struct trap_entry {
|
|
|
2038 unsigned long inst_first;
|
|
|
2039 unsigned long inst_second;
|
|
|
2040 unsigned long inst_third;
|
|
|
2041 unsigned long inst_fourth;
|
|
|
2042 };
|
|
|
2043 /* Four instructions representing entries in the trap table */
|
|
|
2044
|
|
|
2045 struct trap_entry *trap_0_entry;
|
|
|
2046 /* We will set the location of the entry for software trap 0 in the trap
|
|
|
2047 table. */
|
|
|
2048 #endif
|
|
|
2049
|
|
|
2050 void
|
|
|
2051 __gnat_install_handler (void)
|
|
|
2052 {
|
|
|
2053 struct sigaction act;
|
|
|
2054
|
|
|
2055 /* Setup signal handler to map synchronous signals to appropriate
|
|
|
2056 exceptions. Make sure that the handler isn't interrupted by another
|
|
|
2057 signal that might cause a scheduling event! */
|
|
|
2058
|
|
|
2059 act.sa_sigaction = __gnat_error_handler;
|
|
|
2060 act.sa_flags = SA_SIGINFO | SA_ONSTACK;
|
|
|
2061 sigemptyset (&act.sa_mask);
|
|
|
2062
|
|
|
2063 /* For VxWorks, install all signal handlers, since pragma Interrupt_State
|
|
|
2064 applies to vectored hardware interrupts, not signals. */
|
|
|
2065 sigaction (SIGFPE, &act, NULL);
|
|
|
2066 sigaction (SIGILL, &act, NULL);
|
|
|
2067 sigaction (SIGSEGV, &act, NULL);
|
|
|
2068 sigaction (SIGBUS, &act, NULL);
|
|
|
2069
|
|
|
2070 #if defined(__leon__) && defined(_WRS_KERNEL)
|
|
|
2071 /* Specific to the LEON VxWorks kernel run-time library */
|
|
|
2072
|
|
|
2073 /* For stack checking the compiler triggers a software trap 0 (ta 0) in
|
|
|
2074 case of overflow (we use the stack limit mechanism). We need to install
|
|
|
2075 the trap handler here for this software trap (the OS does not handle
|
|
|
2076 it) as if it were a data_access_exception (trap 9). We do the same as
|
|
|
2077 if we put in the trap table a VXSPARC_BAD_TRAP(9). Software trap 0 is
|
|
|
2078 located at vector 0x80, and each entry takes 4 words. */
|
|
|
2079
|
|
|
2080 trap_0_entry = (struct trap_entry *)(intVecBaseGet () + 0x80 * 4);
|
|
|
2081
|
|
|
2082 /* mov 0x9, %l7 */
|
|
|
2083
|
|
|
2084 trap_0_entry->inst_first = 0xae102000 + 9;
|
|
|
2085
|
|
|
2086 /* sethi %hi(excEnt), %l6 */
|
|
|
2087
|
|
|
2088 /* The 22 most significant bits of excEnt are obtained shifting 10 times
|
|
|
2089 to the right. */
|
|
|
2090
|
|
|
2091 trap_0_entry->inst_second = 0x2d000000 + ((unsigned long)excEnt >> 10);
|
|
|
2092
|
|
|
2093 /* jmp %l6+%lo(excEnt) */
|
|
|
2094
|
|
|
2095 /* The 10 least significant bits of excEnt are obtained by masking */
|
|
|
2096
|
|
|
2097 trap_0_entry->inst_third = 0x81c5a000 + ((unsigned long)excEnt & 0x3ff);
|
|
|
2098
|
|
|
2099 /* rd %psr, %l0 */
|
|
|
2100
|
|
|
2101 trap_0_entry->inst_fourth = 0xa1480000;
|
|
|
2102 #endif
|
|
|
2103
|
|
|
2104 #ifdef __HANDLE_VXSIM_SC
|
|
|
2105 /* By experiment, found that sysModel () returns the following string
|
|
|
2106 prefix for vxsim when running on Linux and Windows. */
|
|
|
2107 {
|
|
|
2108 char *model = sysModel ();
|
|
|
2109 if ((strncmp (model, "Linux", 5) == 0)
|
|
|
2110 || (strncmp (model, "Windows", 7) == 0)
|
|
|
2111 || (strncmp (model, "SIMLINUX", 8) == 0) /* vx7 */
|
|
|
2112 || (strncmp (model, "SIMNT", 5) == 0)) /* ditto */
|
|
|
2113 __gnat_set_is_vxsim (TRUE);
|
|
|
2114 }
|
|
|
2115 #endif
|
|
|
2116
|
|
|
2117 __gnat_handler_installed = 1;
|
|
|
2118 }
|
|
|
2119
|
|
|
2120 #define HAVE_GNAT_INIT_FLOAT
|
|
|
2121
|
|
|
2122 void
|
|
|
2123 __gnat_init_float (void)
|
|
|
2124 {
|
|
|
2125 /* Disable overflow/underflow exceptions on the PPC processor, needed
|
|
|
2126 to get correct Ada semantics. Note that for AE653 vThreads, the HW
|
|
|
2127 overflow settings are an OS configuration issue. The instructions
|
|
|
2128 below have no effect. */
|
|
|
2129 #if defined (_ARCH_PPC) && !defined (_SOFT_FLOAT) && (!defined (VTHREADS) || defined (__VXWORKSMILS__))
|
|
|
2130 #if defined (__SPE__)
|
|
|
2131 {
|
|
|
2132 /* For e500v2, do nothing and leave the responsibility to install the
|
|
|
2133 handler and enable the exceptions to the BSP. */
|
|
|
2134 }
|
|
|
2135 #else
|
|
|
2136 asm ("mtfsb0 25");
|
|
|
2137 asm ("mtfsb0 26");
|
|
|
2138 #endif
|
|
|
2139 #endif
|
|
|
2140
|
|
|
2141 #if (defined (__i386__) || defined (__x86_64__)) && !defined (VTHREADS)
|
|
|
2142 /* This is used to properly initialize the FPU on an x86 for each
|
|
|
2143 process thread. */
|
|
|
2144 asm ("finit");
|
|
|
2145 #endif
|
|
|
2146
|
|
|
2147 /* Similarly for SPARC64. Achieved by masking bits in the Trap Enable Mask
|
|
|
2148 field of the Floating-point Status Register (see the SPARC Architecture
|
|
|
2149 Manual Version 9, p 48). */
|
|
|
2150 #if defined (sparc64)
|
|
|
2151
|
|
|
2152 #define FSR_TEM_NVM (1 << 27) /* Invalid operand */
|
|
|
2153 #define FSR_TEM_OFM (1 << 26) /* Overflow */
|
|
|
2154 #define FSR_TEM_UFM (1 << 25) /* Underflow */
|
|
|
2155 #define FSR_TEM_DZM (1 << 24) /* Division by Zero */
|
|
|
2156 #define FSR_TEM_NXM (1 << 23) /* Inexact result */
|
|
|
2157 {
|
|
|
2158 unsigned int fsr;
|
|
|
2159
|
|
|
2160 __asm__("st %%fsr, %0" : "=m" (fsr));
|
|
|
2161 fsr &= ~(FSR_TEM_OFM | FSR_TEM_UFM);
|
|
|
2162 __asm__("ld %0, %%fsr" : : "m" (fsr));
|
|
|
2163 }
|
|
|
2164 #endif
|
|
|
2165 }
|
|
|
2166
|
|
|
2167 /* This subprogram is called by System.Task_Primitives.Operations.Enter_Task
|
|
|
2168 (if not null) when a new task is created. It is initialized by
|
|
|
2169 System.Stack_Checking.Operations.Initialize_Stack_Limit.
|
|
|
2170 The use of a hook avoids to drag stack checking subprograms if stack
|
|
|
2171 checking is not used. */
|
|
|
2172 void (*__gnat_set_stack_limit_hook)(void) = (void (*)(void))0;
|
|
|
2173
|
|
|
2174 /******************/
|
|
|
2175 /* NetBSD Section */
|
|
|
2176 /******************/
|
|
|
2177
|
|
|
2178 #elif defined(__NetBSD__)
|
|
|
2179
|
|
|
2180 #include <signal.h>
|
|
|
2181 #include <unistd.h>
|
|
|
2182
|
|
|
2183 static void
|
|
|
2184 __gnat_error_handler (int sig)
|
|
|
2185 {
|
|
|
2186 struct Exception_Data *exception;
|
|
|
2187 const char *msg;
|
|
|
2188
|
|
|
2189 switch(sig)
|
|
|
2190 {
|
|
|
2191 case SIGFPE:
|
|
|
2192 exception = &constraint_error;
|
|
|
2193 msg = "SIGFPE";
|
|
|
2194 break;
|
|
|
2195 case SIGILL:
|
|
|
2196 exception = &constraint_error;
|
|
|
2197 msg = "SIGILL";
|
|
|
2198 break;
|
|
|
2199 case SIGSEGV:
|
|
|
2200 exception = &storage_error;
|
|
|
2201 msg = "stack overflow or erroneous memory access";
|
|
|
2202 break;
|
|
|
2203 case SIGBUS:
|
|
|
2204 exception = &constraint_error;
|
|
|
2205 msg = "SIGBUS";
|
|
|
2206 break;
|
|
|
2207 default:
|
|
|
2208 exception = &program_error;
|
|
|
2209 msg = "unhandled signal";
|
|
|
2210 }
|
|
|
2211
|
|
|
2212 Raise_From_Signal_Handler (exception, msg);
|
|
|
2213 }
|
|
|
2214
|
|
|
2215 void
|
|
|
2216 __gnat_install_handler (void)
|
|
|
2217 {
|
|
|
2218 struct sigaction act;
|
|
|
2219
|
|
|
2220 act.sa_handler = __gnat_error_handler;
|
|
|
2221 act.sa_flags = SA_NODEFER | SA_RESTART;
|
|
|
2222 sigemptyset (&act.sa_mask);
|
|
|
2223
|
|
|
2224 /* Do not install handlers if interrupt state is "System". */
|
|
|
2225 if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
|
2226 sigaction (SIGFPE, &act, NULL);
|
|
|
2227 if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
|
2228 sigaction (SIGILL, &act, NULL);
|
|
|
2229 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
|
2230 sigaction (SIGSEGV, &act, NULL);
|
|
|
2231 if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
|
2232 sigaction (SIGBUS, &act, NULL);
|
|
|
2233
|
|
|
2234 __gnat_handler_installed = 1;
|
|
|
2235 }
|
|
|
2236
|
|
|
2237 /*******************/
|
|
|
2238 /* OpenBSD Section */
|
|
|
2239 /*******************/
|
|
|
2240
|
|
|
2241 #elif defined(__OpenBSD__)
|
|
|
2242
|
|
|
2243 #include <signal.h>
|
|
|
2244 #include <unistd.h>
|
|
|
2245
|
|
|
2246 static void
|
|
|
2247 __gnat_error_handler (int sig)
|
|
|
2248 {
|
|
|
2249 struct Exception_Data *exception;
|
|
|
2250 const char *msg;
|
|
|
2251
|
|
|
2252 switch(sig)
|
|
|
2253 {
|
|
|
2254 case SIGFPE:
|
|
|
2255 exception = &constraint_error;
|
|
|
2256 msg = "SIGFPE";
|
|
|
2257 break;
|
|
|
2258 case SIGILL:
|
|
|
2259 exception = &constraint_error;
|
|
|
2260 msg = "SIGILL";
|
|
|
2261 break;
|
|
|
2262 case SIGSEGV:
|
|
|
2263 exception = &storage_error;
|
|
|
2264 msg = "stack overflow or erroneous memory access";
|
|
|
2265 break;
|
|
|
2266 case SIGBUS:
|
|
|
2267 exception = &constraint_error;
|
|
|
2268 msg = "SIGBUS";
|
|
|
2269 break;
|
|
|
2270 default:
|
|
|
2271 exception = &program_error;
|
|
|
2272 msg = "unhandled signal";
|
|
|
2273 }
|
|
|
2274
|
|
|
2275 Raise_From_Signal_Handler (exception, msg);
|
|
|
2276 }
|
|
|
2277
|
|
|
2278 void
|
|
|
2279 __gnat_install_handler (void)
|
|
|
2280 {
|
|
|
2281 struct sigaction act;
|
|
|
2282
|
|
|
2283 act.sa_handler = __gnat_error_handler;
|
|
|
2284 act.sa_flags = SA_NODEFER | SA_RESTART;
|
|
|
2285 sigemptyset (&act.sa_mask);
|
|
|
2286
|
|
|
2287 /* Do not install handlers if interrupt state is "System" */
|
|
|
2288 if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
|
2289 sigaction (SIGFPE, &act, NULL);
|
|
|
2290 if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
|
2291 sigaction (SIGILL, &act, NULL);
|
|
|
2292 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
|
2293 sigaction (SIGSEGV, &act, NULL);
|
|
|
2294 if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
|
2295 sigaction (SIGBUS, &act, NULL);
|
|
|
2296
|
|
|
2297 __gnat_handler_installed = 1;
|
|
|
2298 }
|
|
|
2299
|
|
|
2300 /******************/
|
|
|
2301 /* Darwin Section */
|
|
|
2302 /******************/
|
|
|
2303
|
|
|
2304 #elif defined(__APPLE__)
|
|
|
2305
|
|
|
2306 #include <TargetConditionals.h>
|
|
|
2307 #include <signal.h>
|
|
|
2308 #include <stdlib.h>
|
|
|
2309 #include <sys/syscall.h>
|
|
|
2310 #include <sys/sysctl.h>
|
|
|
2311
|
|
|
2312 /* This must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
|
|
|
2313 char __gnat_alternate_stack[32 * 1024]; /* 1 * MINSIGSTKSZ */
|
|
|
2314
|
|
|
2315 /* Defined in xnu unix_signal.c.
|
|
|
2316 Tell the kernel to re-use alt stack when delivering a signal. */
|
|
|
2317 #define UC_RESET_ALT_STACK 0x80000000
|
|
|
2318
|
|
|
2319 #if !(defined (__arm__) || defined (__arm64__) || TARGET_IPHONE_SIMULATOR)
|
|
|
2320 #include <mach/mach_vm.h>
|
|
|
2321 #include <mach/mach_init.h>
|
|
|
2322 #include <mach/vm_statistics.h>
|
|
|
2323 #endif
|
|
|
2324
|
|
|
2325 #ifdef __arm64__
|
|
|
2326 #include <sys/ucontext.h>
|
|
|
2327 #include "sigtramp.h"
|
|
|
2328 #endif
|
|
|
2329
|
|
|
2330 /* Return true if ADDR is within a stack guard area. */
|
|
|
2331 static int
|
|
|
2332 __gnat_is_stack_guard (mach_vm_address_t addr)
|
|
|
2333 {
|
|
|
2334 #if !(defined (__arm__) || defined (__arm64__) || TARGET_IPHONE_SIMULATOR)
|
|
|
2335 kern_return_t kret;
|
|
|
2336 vm_region_submap_info_data_64_t info;
|
|
|
2337 mach_vm_address_t start;
|
|
|
2338 mach_vm_size_t size;
|
|
|
2339 natural_t depth;
|
|
|
2340 mach_msg_type_number_t count;
|
|
|
2341
|
|
|
2342 count = VM_REGION_SUBMAP_INFO_COUNT_64;
|
|
|
2343 start = addr;
|
|
|
2344 size = -1;
|
|
|
2345 depth = 9999;
|
|
|
2346 kret = mach_vm_region_recurse (mach_task_self (), &start, &size, &depth,
|
|
|
2347 (vm_region_recurse_info_t) &info, &count);
|
|
|
2348 if (kret == KERN_SUCCESS
|
|
|
2349 && addr >= start && addr < (start + size)
|
|
|
2350 && info.protection == VM_PROT_NONE
|
|
|
2351 && info.user_tag == VM_MEMORY_STACK)
|
|
|
2352 return 1;
|
|
|
2353 return 0;
|
|
|
2354 #else
|
|
|
2355 /* Pagezero for arm. */
|
|
|
2356 return addr >= 4096;
|
|
|
2357 #endif
|
|
|
2358 }
|
|
|
2359
|
|
|
2360 #define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
2361
|
|
|
2362 #if defined (__x86_64__)
|
|
|
2363 static int
|
|
|
2364 __darwin_major_version (void)
|
|
|
2365 {
|
|
|
2366 static int cache = -1;
|
|
|
2367 if (cache < 0)
|
|
|
2368 {
|
|
|
2369 int mib[2] = {CTL_KERN, KERN_OSRELEASE};
|
|
|
2370 size_t len;
|
|
|
2371
|
|
|
2372 /* Find out how big the buffer needs to be (and set cache to 0
|
|
|
2373 on failure). */
|
|
|
2374 if (sysctl (mib, 2, NULL, &len, NULL, 0) == 0)
|
|
|
2375 {
|
|
|
2376 char release[len];
|
|
|
2377 sysctl (mib, 2, release, &len, NULL, 0);
|
|
|
2378 /* Darwin releases are of the form L.M.N where L is the major
|
|
|
2379 version, so strtol will return L. */
|
|
|
2380 cache = (int) strtol (release, NULL, 10);
|
|
|
2381 }
|
|
|
2382 else
|
|
|
2383 {
|
|
|
2384 cache = 0;
|
|
|
2385 }
|
|
|
2386 }
|
|
|
2387 return cache;
|
|
|
2388 }
|
|
|
2389 #endif
|
|
|
2390
|
|
|
2391 void
|
|
|
2392 __gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED,
|
|
|
2393 void *ucontext ATTRIBUTE_UNUSED)
|
|
|
2394 {
|
|
|
2395 #if defined (__x86_64__)
|
|
|
2396 if (__darwin_major_version () < 12)
|
|
|
2397 {
|
|
|
2398 /* Work around radar #10302855, where the unwinders (libunwind or
|
|
|
2399 libgcc_s depending on the system revision) and the DWARF unwind
|
|
|
2400 data for sigtramp have different ideas about register numbering,
|
|
|
2401 causing rbx and rdx to be transposed. */
|
|
|
2402 ucontext_t *uc = (ucontext_t *)ucontext;
|
|
|
2403 unsigned long t = uc->uc_mcontext->__ss.__rbx;
|
|
|
2404
|
|
|
2405 uc->uc_mcontext->__ss.__rbx = uc->uc_mcontext->__ss.__rdx;
|
|
|
2406 uc->uc_mcontext->__ss.__rdx = t;
|
|
|
2407 }
|
|
|
2408 #elif defined(__arm64__)
|
|
|
2409 /* Even though the CFI is marked as a signal frame, we need this. */
|
|
|
2410 ucontext_t *uc = (ucontext_t *)ucontext;
|
|
|
2411 uc->uc_mcontext->__ss.__pc++;
|
|
|
2412 #endif
|
|
|
2413 }
|
|
|
2414
|
|
|
2415 static void
|
|
|
2416 __gnat_map_signal (int sig, siginfo_t *si, void *mcontext ATTRIBUTE_UNUSED)
|
|
|
2417 {
|
|
|
2418 struct Exception_Data *exception;
|
|
|
2419 const char *msg;
|
|
|
2420
|
|
|
2421 switch (sig)
|
|
|
2422 {
|
|
|
2423 case SIGSEGV:
|
|
|
2424 case SIGBUS:
|
|
|
2425 if (__gnat_is_stack_guard ((unsigned long)si->si_addr))
|
|
|
2426 {
|
|
|
2427 #ifdef __arm64__
|
|
|
2428 /* ??? This is a kludge to make stack checking work. The problem is
|
|
|
2429 that the trampoline doesn't restore LR and, consequently, doesn't
|
|
|
2430 make it possible to unwind past an interrupted frame which hasn"t
|
|
|
2431 saved LR on the stack yet. Therefore, for probes in the prologue
|
|
|
2432 (32-bit probes as opposed to standard 64-bit probes), we make the
|
|
|
2433 unwinder skip the not-yet-established frame altogether. */
|
|
|
2434 mcontext_t mc = (mcontext_t)mcontext;
|
|
|
2435 if (!(*(unsigned int *)(mc->__ss.__pc-1) & ((unsigned int)1 << 30)))
|
|
|
2436 mc->__ss.__pc = mc->__ss.__lr;
|
|
|
2437 #endif
|
|
|
2438 exception = &storage_error;
|
|
|
2439 msg = "stack overflow";
|
|
|
2440 }
|
|
|
2441 else
|
|
|
2442 {
|
|
|
2443 exception = &constraint_error;
|
|
|
2444 msg = "erroneous memory access";
|
|
|
2445 }
|
|
|
2446
|
|
|
2447 /* Reset the use of alt stack, so that the alt stack will be used
|
|
|
2448 for the next signal delivery.
|
|
|
2449 The stack can't be used in case of stack checking. */
|
|
|
2450 syscall (SYS_sigreturn, NULL, UC_RESET_ALT_STACK);
|
|
|
2451 break;
|
|
|
2452
|
|
|
2453 case SIGFPE:
|
|
|
2454 exception = &constraint_error;
|
|
|
2455 msg = "SIGFPE";
|
|
|
2456 break;
|
|
|
2457
|
|
|
2458 default:
|
|
|
2459 exception = &program_error;
|
|
|
2460 msg = "unhandled signal";
|
|
|
2461 }
|
|
|
2462
|
|
|
2463 Raise_From_Signal_Handler (exception, msg);
|
|
|
2464 }
|
|
|
2465
|
|
|
2466 static void
|
|
|
2467 __gnat_error_handler (int sig, siginfo_t *si, void *ucontext)
|
|
|
2468 {
|
|
|
2469 __gnat_adjust_context_for_raise (sig, ucontext);
|
|
|
2470
|
|
|
2471 /* The Darwin libc comes with a signal trampoline, except for ARM64. */
|
|
|
2472 #ifdef __arm64__
|
|
|
2473 __gnat_sigtramp (sig, (void *)si, ucontext,
|
|
|
2474 (__sigtramphandler_t *)&__gnat_map_signal);
|
|
|
2475 #else
|
|
|
2476 __gnat_map_signal (sig, si, ucontext);
|
|
|
2477 #endif
|
|
|
2478 }
|
|
|
2479
|
|
|
2480 void
|
|
|
2481 __gnat_install_handler (void)
|
|
|
2482 {
|
|
|
2483 struct sigaction act;
|
|
|
2484
|
|
|
2485 /* Set up signal handler to map synchronous signals to appropriate
|
|
|
2486 exceptions. Make sure that the handler isn't interrupted by another
|
|
|
2487 signal that might cause a scheduling event! Also setup an alternate
|
|
|
2488 stack region for the handler execution so that stack overflows can be
|
|
|
2489 handled properly, avoiding a SEGV generation from stack usage by the
|
|
|
2490 handler itself (and it is required by Darwin). */
|
|
|
2491
|
|
|
2492 stack_t stack;
|
|
|
2493 stack.ss_sp = __gnat_alternate_stack;
|
|
|
2494 stack.ss_size = sizeof (__gnat_alternate_stack);
|
|
|
2495 stack.ss_flags = 0;
|
|
|
2496 sigaltstack (&stack, NULL);
|
|
|
2497
|
|
|
2498 act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
|
2499 act.sa_sigaction = __gnat_error_handler;
|
|
|
2500 sigemptyset (&act.sa_mask);
|
|
|
2501
|
|
|
2502 /* Do not install handlers if interrupt state is "System". */
|
|
|
2503 if (__gnat_get_interrupt_state (SIGABRT) != 's')
|
|
|
2504 sigaction (SIGABRT, &act, NULL);
|
|
|
2505 if (__gnat_get_interrupt_state (SIGFPE) != 's')
|
|
|
2506 sigaction (SIGFPE, &act, NULL);
|
|
|
2507 if (__gnat_get_interrupt_state (SIGILL) != 's')
|
|
|
2508 sigaction (SIGILL, &act, NULL);
|
|
|
2509
|
|
|
2510 act.sa_flags |= SA_ONSTACK;
|
|
|
2511 if (__gnat_get_interrupt_state (SIGSEGV) != 's')
|
|
|
2512 sigaction (SIGSEGV, &act, NULL);
|
|
|
2513 if (__gnat_get_interrupt_state (SIGBUS) != 's')
|
|
|
2514 sigaction (SIGBUS, &act, NULL);
|
|
|
2515
|
|
|
2516 __gnat_handler_installed = 1;
|
|
|
2517 }
|
|
|
2518
|
|
131
|
2519 #elif defined(__QNX__)
|
|
|
2520
|
|
|
2521 /***************/
|
|
|
2522 /* QNX Section */
|
|
|
2523 /***************/
|
|
|
2524
|
|
|
2525 #include <signal.h>
|
|
|
2526 #include <unistd.h>
|
|
|
2527 #include <string.h>
|
|
|
2528 #include "sigtramp.h"
|
|
|
2529
|
|
|
2530 void
|
|
|
2531 __gnat_map_signal (int sig,
|
|
|
2532 siginfo_t *si ATTRIBUTE_UNUSED,
|
|
|
2533 void *mcontext ATTRIBUTE_UNUSED)
|
|
|
2534 {
|
|
|
2535 struct Exception_Data *exception;
|
|
|
2536 const char *msg;
|
|
|
2537
|
|
|
2538 switch(sig)
|
|
|
2539 {
|
|
|
2540 case SIGFPE:
|
|
|
2541 exception = &constraint_error;
|
|
|
2542 msg = "SIGFPE";
|
|
|
2543 break;
|
|
|
2544 case SIGILL:
|
|
|
2545 exception = &constraint_error;
|
|
|
2546 msg = "SIGILL";
|
|
|
2547 break;
|
|
|
2548 case SIGSEGV:
|
|
|
2549 exception = &storage_error;
|
|
|
2550 msg = "stack overflow or erroneous memory access";
|
|
|
2551 break;
|
|
|
2552 case SIGBUS:
|
|
|
2553 exception = &constraint_error;
|
|
|
2554 msg = "SIGBUS";
|
|
|
2555 break;
|
|
|
2556 default:
|
|
|
2557 exception = &program_error;
|
|
|
2558 msg = "unhandled signal";
|
|
|
2559 }
|
|
|
2560
|
|
|
2561 Raise_From_Signal_Handler (exception, msg);
|
|
|
2562 }
|
|
|
2563
|
|
|
2564 static void
|
|
|
2565 __gnat_error_handler (int sig, siginfo_t *si, void *ucontext)
|
|
|
2566 {
|
|
|
2567 __gnat_sigtramp (sig, (void *) si, (void *) ucontext,
|
|
|
2568 (__sigtramphandler_t *)&__gnat_map_signal);
|
|
|
2569 }
|
|
|
2570
|
|
|
2571 /* This must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
|
|
|
2572 /* sigaltstack is currently not supported by QNX7 */
|
|
|
2573 char __gnat_alternate_stack[0];
|
|
|
2574
|
|
|
2575 void
|
|
|
2576 __gnat_install_handler (void)
|
|
|
2577 {
|
|
|
2578 struct sigaction act;
|
|
|
2579 int err;
|
|
|
2580
|
|
|
2581 act.sa_handler = __gnat_error_handler;
|
|
|
2582 act.sa_flags = SA_NODEFER | SA_SIGINFO;
|
|
|
2583 sigemptyset (&act.sa_mask);
|
|
|
2584
|
|
|
2585 /* Do not install handlers if interrupt state is "System" */
|
|
|
2586 if (__gnat_get_interrupt_state (SIGFPE) != 's') {
|
|
|
2587 err = sigaction (SIGFPE, &act, NULL);
|
|
|
2588 if (err == -1) {
|
|
|
2589 err = errno;
|
|
|
2590 perror ("error while attaching SIGFPE");
|
|
|
2591 perror (strerror (err));
|
|
|
2592 }
|
|
|
2593 }
|
|
|
2594 if (__gnat_get_interrupt_state (SIGILL) != 's') {
|
|
|
2595 sigaction (SIGILL, &act, NULL);
|
|
|
2596 if (err == -1) {
|
|
|
2597 err = errno;
|
|
|
2598 perror ("error while attaching SIGFPE");
|
|
|
2599 perror (strerror (err));
|
|
|
2600 }
|
|
|
2601 }
|
|
|
2602 if (__gnat_get_interrupt_state (SIGSEGV) != 's') {
|
|
|
2603 sigaction (SIGSEGV, &act, NULL);
|
|
|
2604 if (err == -1) {
|
|
|
2605 err = errno;
|
|
|
2606 perror ("error while attaching SIGFPE");
|
|
|
2607 perror (strerror (err));
|
|
|
2608 }
|
|
|
2609 }
|
|
|
2610 if (__gnat_get_interrupt_state (SIGBUS) != 's') {
|
|
|
2611 sigaction (SIGBUS, &act, NULL);
|
|
|
2612 if (err == -1) {
|
|
|
2613 err = errno;
|
|
|
2614 perror ("error while attaching SIGFPE");
|
|
|
2615 perror (strerror (err));
|
|
|
2616 }
|
|
|
2617 }
|
|
|
2618 __gnat_handler_installed = 1;
|
|
|
2619 }
|
|
|
2620
|
|
111
|
2621 #elif defined (__DJGPP__)
|
|
|
2622
|
|
|
2623 void
|
|
|
2624 __gnat_install_handler ()
|
|
|
2625 {
|
|
|
2626 __gnat_handler_installed = 1;
|
|
|
2627 }
|
|
|
2628
|
|
|
2629 #elif defined(__ANDROID__)
|
|
|
2630
|
|
|
2631 /*******************/
|
|
|
2632 /* Android Section */
|
|
|
2633 /*******************/
|
|
|
2634
|
|
|
2635 #include <signal.h>
|
|
|
2636 #include <sys/ucontext.h>
|
|
|
2637 #include "sigtramp.h"
|
|
|
2638
|
|
|
2639 #define HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
|
|
|
2640
|
|
|
2641 void
|
|
|
2642 __gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED, void *ucontext)
|
|
|
2643 {
|
|
|
2644 mcontext_t *mcontext = &((ucontext_t *) ucontext)->uc_mcontext;
|
|
|
2645
|
|
|
2646 /* ARM Bump has to be an even number because of odd/even architecture. */
|
|
|
2647 ((mcontext_t *) mcontext)->arm_pc += 2;
|
|
|
2648 }
|
|
|
2649
|
|
|
2650 static void
|
|
|
2651 __gnat_map_signal (int sig,
|
|
|
2652 siginfo_t *si ATTRIBUTE_UNUSED,
|
|
|
2653 void *mcontext ATTRIBUTE_UNUSED)
|
|
|
2654 {
|
|
|
2655 struct Exception_Data *exception;
|
|
|
2656 const char *msg;
|
|
|
2657
|
|
|
2658 switch (sig)
|
|
|
2659 {
|
|
|
2660 case SIGSEGV:
|
|
|
2661 exception = &storage_error;
|
|
|
2662 msg = "stack overflow or erroneous memory access";
|
|
|
2663 break;
|
|
|
2664
|
|
|
2665 case SIGBUS:
|
|
|
2666 exception = &constraint_error;
|
|
|
2667 msg = "SIGBUS";
|
|
|
2668 break;
|
|
|
2669
|
|
|
2670 case SIGFPE:
|
|
|
2671 exception = &constraint_error;
|
|
|
2672 msg = "SIGFPE";
|
|
|
2673 break;
|
|
|
2674
|
|
|
2675 default:
|
|
|
2676 exception = &program_error;
|
|
|
2677 msg = "unhandled signal";
|
|
|
2678 }
|
|
|
2679
|
|
|
2680 Raise_From_Signal_Handler (exception, msg);
|
|
|
2681 }
|
|
|
2682
|
|
|
2683 static void
|
|
|
2684 __gnat_error_handler (int sig, siginfo_t *si, void *ucontext)
|
|
|
2685 {
|
|
|
2686 __gnat_adjust_context_for_raise (sig, ucontext);
|
|
|
2687
|
|
|
2688 __gnat_sigtramp (sig, (void *) si, (void *) ucontext,
|
|
|
2689 (__sigtramphandler_t *)&__gnat_map_signal);
|
|
|
2690 }
|
|
|
2691
|
|
|
2692 /* This must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
|
|
|
2693 char __gnat_alternate_stack[16 * 1024];
|
|
|
2694
|
|
|
2695 void
|
|
|
2696 __gnat_install_handler (void)
|
|
|
2697 {
|
|
|
2698 struct sigaction act;
|
|
|
2699
|
|
|
2700 /* Set up signal handler to map synchronous signals to appropriate
|
|
|
2701 exceptions. Make sure that the handler isn't interrupted by another
|
|
|
2702 signal that might cause a scheduling event! Also setup an alternate
|
|
|
2703 stack region for the handler execution so that stack overflows can be
|
|
|
2704 handled properly, avoiding a SEGV generation from stack usage by the
|
|
|
2705 handler itself. */
|
|
|
2706
|
|
|
2707 stack_t stack;
|
|
|
2708 stack.ss_sp = __gnat_alternate_stack;
|
|
|
2709 stack.ss_size = sizeof (__gnat_alternate_stack);
|
|
|
2710 stack.ss_flags = 0;
|
|
|
2711 sigaltstack (&stack, NULL);
|
|
|
2712
|
|
|
2713 act.sa_sigaction = __gnat_error_handler;
|
|
|
2714 act.sa_flags = SA_NODEFER | SA_RESTART | SA_SIGINFO;
|
|
|
2715 sigemptyset (&act.sa_mask);
|
|
|
2716
|
|
|
2717 sigaction (SIGABRT, &act, NULL);
|
|
|
2718 sigaction (SIGFPE, &act, NULL);
|
|
|
2719 sigaction (SIGILL, &act, NULL);
|
|
|
2720 sigaction (SIGBUS, &act, NULL);
|
|
|
2721 act.sa_flags |= SA_ONSTACK;
|
|
|
2722 sigaction (SIGSEGV, &act, NULL);
|
|
|
2723
|
|
|
2724 __gnat_handler_installed = 1;
|
|
|
2725 }
|
|
|
2726
|
|
|
2727 #else
|
|
|
2728
|
|
|
2729 /* For all other versions of GNAT, the handler does nothing. */
|
|
|
2730
|
|
|
2731 /*******************/
|
|
|
2732 /* Default Section */
|
|
|
2733 /*******************/
|
|
|
2734
|
|
|
2735 void
|
|
|
2736 __gnat_install_handler (void)
|
|
|
2737 {
|
|
|
2738 __gnat_handler_installed = 1;
|
|
|
2739 }
|
|
|
2740
|
|
|
2741 #endif
|
|
|
2742
|
|
|
2743 /*********************/
|
|
|
2744 /* __gnat_init_float */
|
|
|
2745 /*********************/
|
|
|
2746
|
|
|
2747 /* This routine is called as each process thread is created, for possible
|
|
|
2748 initialization of the FP processor. This version is used under INTERIX
|
|
|
2749 and WIN32. */
|
|
|
2750
|
|
|
2751 #if defined (_WIN32) || defined (__INTERIX) \
|
|
|
2752 || defined (__Lynx__) || defined(__NetBSD__) || defined(__FreeBSD__) \
|
|
131
|
2753 || defined (__OpenBSD__) || defined (__DragonFly__) || defined(__QNX__)
|
|
111
|
2754
|
|
|
2755 #define HAVE_GNAT_INIT_FLOAT
|
|
|
2756
|
|
|
2757 void
|
|
|
2758 __gnat_init_float (void)
|
|
|
2759 {
|
|
|
2760 #if defined (__i386__) || defined (__x86_64__)
|
|
|
2761
|
|
|
2762 /* This is used to properly initialize the FPU on an x86 for each
|
|
|
2763 process thread. */
|
|
|
2764
|
|
|
2765 asm ("finit");
|
|
|
2766
|
|
|
2767 #endif /* Defined __i386__ */
|
|
|
2768 }
|
|
|
2769 #endif
|
|
|
2770
|
|
|
2771 #ifndef HAVE_GNAT_INIT_FLOAT
|
|
|
2772
|
|
|
2773 /* All targets without a specific __gnat_init_float will use an empty one. */
|
|
|
2774 void
|
|
|
2775 __gnat_init_float (void)
|
|
|
2776 {
|
|
|
2777 }
|
|
|
2778 #endif
|
|
|
2779
|
|
|
2780 /***********************************/
|
|
|
2781 /* __gnat_adjust_context_for_raise */
|
|
|
2782 /***********************************/
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2783
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2784 #ifndef HAVE_GNAT_ADJUST_CONTEXT_FOR_RAISE
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2785
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2786 /* All targets without a specific version will use an empty one. */
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2787
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2788 /* Given UCONTEXT a pointer to a context structure received by a signal
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2789 handler for SIGNO, perform the necessary adjustments to let the handler
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2790 raise an exception. Calls to this routine are not conditioned by the
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2791 propagation scheme in use. */
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2792
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2793 void
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2794 __gnat_adjust_context_for_raise (int signo ATTRIBUTE_UNUSED,
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2795 void *ucontext ATTRIBUTE_UNUSED)
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2796 {
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2797 /* We used to compensate here for the raised from call vs raised from signal
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2798 exception discrepancy with the GCC ZCX scheme, but this now can be dealt
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2799 with generically in the unwinder (see GCC PR other/26208). This however
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2800 requires the use of the _Unwind_GetIPInfo routine in raise-gcc.c, which
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2801 is predicated on the definition of HAVE_GETIPINFO at compile time. Only
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2802 the VMS ports still do the compensation described in the few lines below.
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2803
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2804 *** Call vs signal exception discrepancy with GCC ZCX scheme ***
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2805
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2806 The GCC unwinder expects to be dealing with call return addresses, since
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2807 this is the "nominal" case of what we retrieve while unwinding a regular
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2808 call chain.
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2809
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2810 To evaluate if a handler applies at some point identified by a return
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2811 address, the propagation engine needs to determine what region the
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2812 corresponding call instruction pertains to. Because the return address
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2813 may not be attached to the same region as the call, the unwinder always
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2814 subtracts "some" amount from a return address to search the region
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2815 tables, amount chosen to ensure that the resulting address is inside the
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2816 call instruction.
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2817
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2818 When we raise an exception from a signal handler, e.g. to transform a
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2819 SIGSEGV into Storage_Error, things need to appear as if the signal
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2820 handler had been "called" by the instruction which triggered the signal,
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2821 so that exception handlers that apply there are considered. What the
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2822 unwinder will retrieve as the return address from the signal handler is
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2823 what it will find as the faulting instruction address in the signal
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2824 context pushed by the kernel. Leaving this address untouched looses, if
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2825 the triggering instruction happens to be the very first of a region, as
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2826 the later adjustments performed by the unwinder would yield an address
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2827 outside that region. We need to compensate for the unwinder adjustments
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2828 at some point, and this is what this routine is expected to do.
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2829
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2830 signo is passed because on some targets for some signals the PC in
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2831 context points to the instruction after the faulting one, in which case
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2832 the unwinder adjustment is still desired. */
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2833 }
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2834
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2835 #endif
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2836
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2837 #ifdef __cplusplus
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2838 }
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2839 #endif
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