1 | /* |
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2 | * Implementation of hooks for the CYGNUS newlib libc |
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3 | * These hooks set things up so that: |
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4 | * + '_REENT' is switched at task switch time. |
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5 | * |
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6 | * COPYRIGHT (c) 1994 by Division Incorporated |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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11 | * |
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12 | * $Id$ |
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13 | * |
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14 | */ |
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15 | |
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16 | #define __RTEMS_VIOLATE_KERNEL_VISIBILITY__ |
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17 | #include <rtems.h> |
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18 | |
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19 | #if defined(RTEMS_NEWLIB) |
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20 | #include <libcsupport.h> |
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21 | #include <stdlib.h> /* for free() */ |
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22 | #include <string.h> /* for memset() */ |
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23 | |
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24 | #include <sys/reent.h> /* for extern of _REENT (aka _impure_ptr) */ |
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25 | #include <errno.h> |
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26 | |
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27 | /* |
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28 | * NOTE: |
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29 | * There is some problem with doing this on the hpux version |
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30 | * of the UNIX simulator (symptom is printf core dumps), so |
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31 | * we just don't for now. |
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32 | * Not sure if this is a problem with hpux, newlib, or something else. |
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33 | */ |
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34 | |
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35 | #if defined(RTEMS_UNIX) && !defined(hpux) |
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36 | #define NEED_SETVBUF |
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37 | #endif |
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38 | |
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39 | #ifdef NEED_SETVBUF |
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40 | #include <stdio.h> |
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41 | #endif |
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42 | |
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43 | static int extension_index; |
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44 | |
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45 | /* |
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46 | * Private routines |
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47 | */ |
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48 | |
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49 | #define set_newlib_extension( _the_thread, _value ) \ |
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50 | (_the_thread)->extensions[ extension_index ] = (_value); |
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51 | |
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52 | #define get_newlib_extension( _the_thread ) \ |
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53 | (_the_thread)->extensions[ extension_index ] |
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54 | |
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55 | int libc_reentrant; /* do we think we are reentrant? */ |
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56 | struct _reent libc_global_reent; |
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57 | |
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58 | /* |
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59 | * CYGNUS newlib routine that does atexit() processing and flushes |
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60 | * stdio streams |
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61 | * undocumented |
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62 | */ |
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63 | |
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64 | extern void _wrapup_reent(struct _reent *); |
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65 | extern void _reclaim_reent(struct _reent *); |
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66 | |
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67 | #include <stdio.h> |
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68 | |
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69 | void libc_wrapup(void) |
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70 | { |
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71 | /* |
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72 | * In case RTEMS is already down, don't do this. It could be |
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73 | * dangerous. |
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74 | */ |
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75 | |
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76 | if (!_System_state_Is_up(_System_state_Get())) |
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77 | return; |
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78 | |
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79 | /* |
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80 | * This was already done if the user called exit() directly . |
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81 | _wrapup_reent(0); |
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82 | */ |
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83 | |
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84 | if (_REENT != &libc_global_reent) { |
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85 | _wrapup_reent(&libc_global_reent); |
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86 | #if 0 |
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87 | /* Don't reclaim this one, just in case we do printfs |
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88 | * on the way out to ROM. |
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89 | */ |
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90 | _reclaim_reent(&libc_global_reent); |
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91 | #endif |
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92 | _REENT = &libc_global_reent; |
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93 | } |
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94 | |
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95 | /* |
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96 | * Try to drain output buffers. |
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97 | * |
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98 | * Should this be changed to do *all* file streams? |
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99 | * _fwalk (_REENT, fclose); |
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100 | */ |
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101 | |
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102 | fclose (stdin); |
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103 | fclose (stdout); |
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104 | fclose (stderr); |
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105 | } |
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106 | |
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107 | |
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108 | rtems_boolean libc_create_hook( |
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109 | rtems_tcb *current_task, |
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110 | rtems_tcb *creating_task |
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111 | ) |
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112 | { |
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113 | set_newlib_extension( creating_task, NULL ); |
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114 | return TRUE; |
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115 | } |
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116 | |
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117 | /* |
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118 | * Called for all user TASKS (system tasks are MPCI Receive Server and IDLE) |
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119 | */ |
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120 | |
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121 | rtems_extension libc_start_hook( |
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122 | rtems_tcb *current_task, |
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123 | rtems_tcb *starting_task |
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124 | ) |
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125 | { |
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126 | struct _reent *ptr; |
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127 | |
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128 | /* NOTE: The RTEMS malloc is reentrant without a reent ptr since |
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129 | * it is based on the Classic API Region Manager. |
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130 | */ |
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131 | |
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132 | ptr = (struct _reent *) calloc(1, sizeof(struct _reent)); |
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133 | |
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134 | if (!ptr) |
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135 | rtems_fatal_error_occurred(RTEMS_NO_MEMORY); |
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136 | |
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137 | #ifdef __GNUC__ |
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138 | /* GCC extension: structure constants */ |
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139 | *ptr = (struct _reent) _REENT_INIT((*ptr)); |
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140 | #else |
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141 | /* |
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142 | * WARNING: THIS IS VERY DEPENDENT ON NEWLIB!!! |
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143 | * Last visual check was against newlib 1.8.2 but last known |
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144 | * use was against 1.7.0. This is basically an exansion of |
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145 | * REENT_INIT() in <sys/reent.h>. |
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146 | * NOTE: calloc() takes care of zeroing fields. |
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147 | */ |
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148 | ptr->_stdin = &ptr->__sf[0]; |
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149 | ptr->_stdout = &ptr->__sf[1]; |
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150 | ptr->_stderr = &ptr->__sf[2]; |
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151 | ptr->_current_locale = "C"; |
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152 | ptr->_new._reent._rand_next = 1; |
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153 | #endif |
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154 | |
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155 | set_newlib_extension( starting_task, ptr ); |
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156 | } |
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157 | |
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158 | /* |
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159 | * Called for all user TASKS (system tasks are MPCI Receive Server and IDLE) |
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160 | */ |
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161 | |
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162 | #ifdef NEED_SETVBUF |
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163 | rtems_extension libc_begin_hook(rtems_tcb *current_task) |
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164 | { |
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165 | setvbuf( stdout, NULL, _IOLBF, BUFSIZ ); |
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166 | } |
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167 | #endif |
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168 | |
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169 | rtems_extension libc_switch_hook( |
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170 | rtems_tcb *current_task, |
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171 | rtems_tcb *heir_task |
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172 | ) |
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173 | { |
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174 | /* |
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175 | * Don't touch the outgoing task if it has been deleted. |
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176 | */ |
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177 | |
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178 | if ( !_States_Is_transient( current_task->current_state ) ) { |
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179 | set_newlib_extension( current_task, _REENT ); |
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180 | } |
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181 | |
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182 | _REENT = (struct _reent *) get_newlib_extension( heir_task ); |
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183 | } |
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184 | |
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185 | /* |
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186 | * Function: libc_delete_hook |
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187 | * Created: 94/12/10 |
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188 | * |
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189 | * Description: |
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190 | * Called when a task is deleted. |
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191 | * Must restore the new lib reentrancy state for the new current |
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192 | * task. |
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193 | * |
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194 | * Parameters: |
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195 | * |
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196 | * |
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197 | * Returns: |
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198 | * |
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199 | * |
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200 | * Side Effects: |
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201 | * |
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202 | * Notes: |
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203 | * |
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204 | * |
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205 | * Deficiencies/ToDo: |
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206 | * |
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207 | * |
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208 | */ |
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209 | |
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210 | rtems_extension libc_delete_hook( |
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211 | rtems_tcb *current_task, |
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212 | rtems_tcb *deleted_task |
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213 | ) |
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214 | { |
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215 | struct _reent *ptr; |
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216 | |
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217 | /* |
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218 | * The reentrancy structure was allocated by newlib using malloc() |
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219 | */ |
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220 | |
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221 | if (current_task == deleted_task) { |
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222 | ptr = _REENT; |
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223 | } else { |
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224 | ptr = (struct _reent *) get_newlib_extension( deleted_task ); |
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225 | } |
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226 | |
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227 | /* if (ptr) */ |
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228 | if (ptr && ptr != &libc_global_reent) { |
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229 | _wrapup_reent(ptr); |
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230 | _reclaim_reent(ptr); |
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231 | free(ptr); |
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232 | } |
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233 | |
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234 | set_newlib_extension( deleted_task, NULL ); |
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235 | |
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236 | /* |
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237 | * Require the switch back to another task to install its own |
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238 | */ |
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239 | |
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240 | if ( current_task == deleted_task ) { |
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241 | _REENT = 0; |
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242 | } |
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243 | } |
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244 | |
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245 | /* |
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246 | * Function: libc_init |
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247 | * Created: 94/12/10 |
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248 | * |
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249 | * Description: |
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250 | * Init libc for CYGNUS newlib |
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251 | * Set up _REENT to use our global libc_global_reent. |
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252 | * (newlib provides a global of its own, but we prefer our |
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253 | * own name for it) |
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254 | * |
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255 | * If reentrancy is desired (which it should be), then |
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256 | * we install the task extension hooks to maintain the |
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257 | * newlib reentrancy global variable _REENT on task |
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258 | * create, delete, switch, exit, etc. |
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259 | * |
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260 | * Parameters: |
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261 | * reentrant non-zero if reentrant library desired. |
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262 | * |
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263 | * Returns: |
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264 | * |
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265 | * Side Effects: |
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266 | * installs libc extensions if reentrant. |
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267 | * |
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268 | * Notes: |
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269 | * |
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270 | * |
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271 | * Deficiencies/ToDo: |
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272 | * |
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273 | */ |
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274 | |
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275 | void |
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276 | libc_init(int reentrant) |
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277 | { |
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278 | rtems_extensions_table libc_extension; |
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279 | rtems_status_code rc; |
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280 | rtems_id extension_id; |
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281 | |
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282 | libc_global_reent = (struct _reent) _REENT_INIT((libc_global_reent)); |
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283 | _REENT = &libc_global_reent; |
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284 | |
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285 | if (reentrant) { |
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286 | memset(&libc_extension, 0, sizeof(libc_extension)); |
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287 | |
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288 | libc_extension.thread_create = libc_create_hook; |
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289 | libc_extension.thread_start = libc_start_hook; |
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290 | #ifdef NEED_SETVBUF |
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291 | libc_extension.thread_begin = libc_begin_hook; |
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292 | #endif |
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293 | libc_extension.thread_switch = libc_switch_hook; |
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294 | libc_extension.thread_delete = libc_delete_hook; |
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295 | |
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296 | rc = rtems_extension_create(rtems_build_name('L', 'I', 'B', 'C'), |
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297 | &libc_extension, &extension_id); |
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298 | if (rc != RTEMS_SUCCESSFUL) |
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299 | rtems_fatal_error_occurred( rc ); |
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300 | |
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301 | libc_reentrant = reentrant; |
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302 | extension_index = rtems_get_index( extension_id ); |
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303 | } |
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304 | } |
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305 | |
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306 | /* |
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307 | * Function: _exit |
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308 | * Created: 94/12/10 |
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309 | * |
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310 | * Description: |
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311 | * Called from exit() after it does atexit() processing and stdio fflush's |
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312 | * |
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313 | * called from bottom of exit() to really delete the task. |
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314 | * If we are using reentrant libc, then let the delete extension |
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315 | * do all the work, otherwise if a shutdown is in progress, |
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316 | * then just do it. |
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317 | * |
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318 | * Parameters: |
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319 | * exit status |
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320 | * |
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321 | * Returns: |
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322 | * does not return |
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323 | * |
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324 | * Side Effects: |
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325 | * |
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326 | * Notes: |
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327 | * |
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328 | * |
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329 | * Deficiencies/ToDo: |
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330 | * |
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331 | * |
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332 | */ |
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333 | |
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334 | #include <stdio.h> |
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335 | |
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336 | #if !defined(RTEMS_UNIX) && !defined(_AM29K) |
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337 | void _exit(int status) |
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338 | { |
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339 | /* |
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340 | * We need to do the exit processing on the global reentrancy structure. |
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341 | * This has already been done on the per task reentrancy structure |
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342 | * associated with this task. |
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343 | */ |
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344 | |
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345 | libc_wrapup(); |
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346 | rtems_shutdown_executive(status); |
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347 | } |
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348 | |
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349 | #else |
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350 | |
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351 | void exit(int status) |
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352 | { |
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353 | libc_wrapup(); |
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354 | rtems_shutdown_executive(status); |
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355 | } |
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356 | #endif |
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357 | |
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358 | |
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359 | #endif |
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