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 | /* |
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44 | * Private routines |
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45 | */ |
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46 | |
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47 | void MY_task_set_note( |
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48 | rtems_tcb *tcb, |
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49 | rtems_unsigned32 notepad, |
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50 | rtems_unsigned32 note |
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51 | ); |
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52 | |
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53 | rtems_unsigned32 MY_task_get_note( |
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54 | rtems_tcb *tcb, |
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55 | rtems_unsigned32 notepad |
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56 | ); |
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57 | |
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58 | |
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59 | #define LIBC_NOTEPAD RTEMS_NOTEPAD_LAST |
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60 | |
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61 | |
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62 | int libc_reentrant; /* do we think we are reentrant? */ |
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63 | struct _reent libc_global_reent; |
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64 | |
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65 | /* |
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66 | * CYGNUS newlib routine that does atexit() processing and flushes |
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67 | * stdio streams |
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68 | * undocumented |
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69 | */ |
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70 | |
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71 | extern void _wrapup_reent(struct _reent *); |
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72 | extern void _reclaim_reent(struct _reent *); |
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73 | |
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74 | #include <stdio.h> |
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75 | |
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76 | void |
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77 | libc_wrapup(void) |
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78 | { |
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79 | /* |
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80 | * In case RTEMS is already down, don't do this. It could be |
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81 | * dangerous. |
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82 | */ |
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83 | |
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84 | if (!_System_state_Is_up(_System_state_Get())) |
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85 | return; |
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86 | |
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87 | /* |
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88 | * This was already done if the user called exit() directly . |
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89 | |
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90 | _wrapup_reent(0); |
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91 | */ |
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92 | if (_REENT != &libc_global_reent) |
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93 | { |
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94 | _wrapup_reent(&libc_global_reent); |
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95 | #if 0 |
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96 | /* don't reclaim this one, just in case we do printfs */ |
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97 | /* on our way out to ROM */ |
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98 | _reclaim_reent(&libc_global_reent); |
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99 | #endif |
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100 | _REENT = &libc_global_reent; |
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101 | } |
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102 | |
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103 | /* |
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104 | * Try to drain output buffers. |
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105 | * |
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106 | * Should this be changed to do *all* file streams? |
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107 | * _fwalk (_REENT, fclose); |
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108 | */ |
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109 | fclose (stdin); |
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110 | fclose (stdout); |
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111 | fclose (stderr); |
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112 | } |
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113 | |
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114 | |
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115 | rtems_boolean |
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116 | libc_create_hook(rtems_tcb *current_task, |
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117 | rtems_tcb *creating_task) |
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118 | { |
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119 | MY_task_set_note(creating_task, LIBC_NOTEPAD, 0); |
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120 | return TRUE; |
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121 | } |
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122 | |
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123 | /* |
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124 | * Called for all user TASKS (system tasks are MPCI Receive Server and IDLE) |
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125 | */ |
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126 | |
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127 | rtems_extension |
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128 | libc_start_hook(rtems_tcb *current_task, |
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129 | rtems_tcb *starting_task) |
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130 | { |
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131 | struct _reent *ptr; |
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132 | |
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133 | /* NOTE: our malloc is reentrant without a reent ptr since |
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134 | * it is based on region manager |
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135 | */ |
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136 | |
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137 | ptr = (struct _reent *) calloc(1, sizeof(struct _reent)); |
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138 | |
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139 | if (!ptr) |
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140 | rtems_fatal_error_occurred(RTEMS_NO_MEMORY); |
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141 | |
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142 | #ifdef __GNUC__ |
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143 | /* GCC extension: structure constants */ |
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144 | *ptr = (struct _reent) _REENT_INIT((*ptr)); |
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145 | #else |
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146 | /* |
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147 | * Warning: THIS IS VERY DEPENDENT ON NEWLIB!!! WRITTEN FOR 1.7.0 |
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148 | */ |
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149 | ptr->_errno=0; |
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150 | ptr->_stdin=&ptr->__sf[0]; |
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151 | ptr->_stdout=&ptr->__sf[1]; |
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152 | ptr->_stderr=&ptr->__sf[2]; |
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153 | ptr->_scanpoint=0; |
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154 | ptr->_asctime[0]=0; |
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155 | ptr->_next=1; |
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156 | ptr->__sdidinit=0; |
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157 | #endif |
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158 | |
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159 | MY_task_set_note(starting_task, LIBC_NOTEPAD, (rtems_unsigned32) ptr); |
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160 | } |
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161 | |
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162 | /* |
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163 | * Called for all user TASKS (system tasks are MPCI Receive Server and IDLE) |
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164 | */ |
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165 | |
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166 | #ifdef NEED_SETVBUF |
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167 | rtems_extension |
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168 | libc_begin_hook(rtems_tcb *current_task) |
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169 | { |
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170 | setvbuf( stdout, NULL, _IOLBF, BUFSIZ ); |
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171 | } |
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172 | #endif |
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173 | |
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174 | rtems_extension |
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175 | libc_switch_hook(rtems_tcb *current_task, |
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176 | rtems_tcb *heir_task) |
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177 | { |
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178 | rtems_unsigned32 impure_value; |
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179 | |
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180 | /* XXX We can't use rtems_task_set_note() here since SYSI task has a |
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181 | * tid of 0, which is treated specially (optimized, actually) |
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182 | * by rtems_task_set_note |
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183 | * |
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184 | * NOTE: The above comment is no longer true and we need to use |
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185 | * the extension data areas added about the same time. |
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186 | */ |
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187 | |
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188 | /* |
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189 | * Don't touch the outgoing task if it has been deleted. |
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190 | */ |
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191 | |
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192 | if ( !_States_Is_transient( current_task->current_state ) ) { |
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193 | impure_value = (rtems_unsigned32) _REENT; |
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194 | MY_task_set_note(current_task, LIBC_NOTEPAD, impure_value); |
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195 | } |
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196 | |
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197 | _REENT = (struct _reent *) MY_task_get_note(heir_task, LIBC_NOTEPAD); |
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198 | |
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199 | } |
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200 | |
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201 | /* |
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202 | * Function: libc_delete_hook |
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203 | * Created: 94/12/10 |
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204 | * |
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205 | * Description: |
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206 | * Called when a task is deleted. |
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207 | * Must restore the new lib reentrancy state for the new current |
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208 | * task. |
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209 | * |
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210 | * Parameters: |
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211 | * |
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212 | * |
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213 | * Returns: |
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214 | * |
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215 | * |
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216 | * Side Effects: |
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217 | * |
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218 | * Notes: |
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219 | * |
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220 | * |
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221 | * Deficiencies/ToDo: |
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222 | * |
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223 | * |
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224 | */ |
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225 | rtems_extension |
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226 | libc_delete_hook(rtems_tcb *current_task, |
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227 | rtems_tcb *deleted_task) |
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228 | { |
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229 | struct _reent *ptr; |
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230 | |
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231 | /* |
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232 | * The reentrancy structure was allocated by newlib using malloc() |
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233 | */ |
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234 | |
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235 | if (current_task == deleted_task) |
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236 | { |
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237 | ptr = _REENT; |
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238 | } |
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239 | else |
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240 | { |
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241 | ptr = (struct _reent *) MY_task_get_note(deleted_task, LIBC_NOTEPAD); |
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242 | } |
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243 | |
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244 | /* if (ptr) */ |
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245 | if (ptr && ptr != &libc_global_reent) |
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246 | { |
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247 | _wrapup_reent(ptr); |
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248 | _reclaim_reent(ptr); |
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249 | free(ptr); |
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250 | } |
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251 | |
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252 | MY_task_set_note(deleted_task, LIBC_NOTEPAD, 0); |
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253 | |
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254 | /* |
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255 | * Require the switch back to another task to install its own |
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256 | */ |
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257 | |
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258 | if (current_task == deleted_task) |
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259 | { |
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260 | _REENT = 0; |
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261 | } |
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262 | } |
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263 | |
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264 | /* |
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265 | * Function: libc_init |
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266 | * Created: 94/12/10 |
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267 | * |
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268 | * Description: |
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269 | * Init libc for CYGNUS newlib |
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270 | * Set up _REENT to use our global libc_global_reent. |
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271 | * (newlib provides a global of its own, but we prefer our |
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272 | * own name for it) |
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273 | * |
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274 | * If reentrancy is desired (which it should be), then |
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275 | * we install the task extension hooks to maintain the |
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276 | * newlib reentrancy global variable _REENT on task |
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277 | * create, delete, switch, exit, etc. |
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278 | * |
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279 | * Parameters: |
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280 | * reentrant non-zero if reentrant library desired. |
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281 | * |
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282 | * Returns: |
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283 | * |
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284 | * Side Effects: |
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285 | * installs libc extensions if reentrant. |
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286 | * |
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287 | * Notes: |
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288 | * |
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289 | * |
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290 | * Deficiencies/ToDo: |
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291 | * |
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292 | */ |
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293 | |
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294 | void |
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295 | libc_init(int reentrant) |
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296 | { |
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297 | rtems_extensions_table libc_extension; |
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298 | rtems_id extension_id; |
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299 | rtems_status_code rc; |
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300 | |
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301 | libc_global_reent = (struct _reent) _REENT_INIT((libc_global_reent)); |
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302 | _REENT = &libc_global_reent; |
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303 | |
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304 | if (reentrant) |
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305 | { |
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306 | memset(&libc_extension, 0, sizeof(libc_extension)); |
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307 | |
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308 | libc_extension.thread_create = libc_create_hook; |
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309 | libc_extension.thread_start = libc_start_hook; |
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310 | #ifdef NEED_SETVBUF |
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311 | libc_extension.thread_begin = libc_begin_hook; |
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312 | #endif |
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313 | libc_extension.thread_switch = libc_switch_hook; |
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314 | libc_extension.thread_delete = libc_delete_hook; |
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315 | |
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316 | rc = rtems_extension_create(rtems_build_name('L', 'I', 'B', 'C'), |
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317 | &libc_extension, &extension_id); |
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318 | if (rc != RTEMS_SUCCESSFUL) |
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319 | rtems_fatal_error_occurred( rc ); |
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320 | |
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321 | libc_reentrant = reentrant; |
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322 | } |
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323 | } |
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324 | |
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325 | #if 0 |
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326 | /* |
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327 | * Routines required by the gnat runtime. |
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328 | */ |
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329 | |
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330 | int get_errno() |
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331 | { |
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332 | return errno; |
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333 | } |
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334 | #endif |
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335 | |
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336 | /* |
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337 | * Function: _exit |
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338 | * Created: 94/12/10 |
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339 | * |
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340 | * Description: |
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341 | * Called from exit() after it does atexit() processing and stdio fflush's |
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342 | * |
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343 | * called from bottom of exit() to really delete the task. |
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344 | * If we are using reentrant libc, then let the delete extension |
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345 | * do all the work, otherwise if a shutdown is in progress, |
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346 | * then just do it. |
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347 | * |
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348 | * Parameters: |
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349 | * exit status |
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350 | * |
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351 | * Returns: |
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352 | * does not return |
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353 | * |
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354 | * Side Effects: |
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355 | * |
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356 | * Notes: |
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357 | * |
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358 | * |
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359 | * Deficiencies/ToDo: |
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360 | * |
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361 | * |
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362 | */ |
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363 | |
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364 | #include <stdio.h> |
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365 | |
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366 | #if !defined(RTEMS_UNIX) && !defined(_AM29K) |
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367 | void _exit(int status) |
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368 | { |
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369 | /* |
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370 | * We need to do the exit processing on the global reentrancy structure. |
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371 | * This has already been done on the per task reentrancy structure |
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372 | * associated with this task. |
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373 | */ |
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374 | |
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375 | libc_wrapup(); |
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376 | rtems_shutdown_executive(status); |
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377 | } |
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378 | |
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379 | #else |
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380 | |
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381 | void exit(int status) |
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382 | { |
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383 | libc_wrapup(); |
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384 | rtems_shutdown_executive(status); |
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385 | } |
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386 | #endif |
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387 | |
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388 | |
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389 | /* |
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390 | * These are directly supported (and completely correct) in the posix api. |
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391 | */ |
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392 | |
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393 | pid_t __getpid(void) |
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394 | { |
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395 | return getpid(); |
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396 | } |
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397 | |
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398 | #if !defined(RTEMS_POSIX_API) |
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399 | pid_t getpid(void) |
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400 | { |
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401 | return 0; |
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402 | } |
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403 | |
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404 | pid_t _getpid_r( |
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405 | struct _reent *ptr |
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406 | ) |
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407 | { |
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408 | return getpid(); |
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409 | } |
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410 | #endif |
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411 | |
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412 | #if !defined(RTEMS_POSIX_API) |
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413 | int kill( pid_t pid, int sig ) |
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414 | { |
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415 | return 0; |
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416 | } |
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417 | |
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418 | int _kill_r( pid_t pid, int sig ) |
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419 | { |
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420 | return 0; |
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421 | } |
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422 | #endif |
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423 | |
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424 | int __kill( pid_t pid, int sig ) |
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425 | { |
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426 | return 0; |
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427 | } |
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428 | |
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429 | #if !defined(RTEMS_POSIX_API) |
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430 | unsigned int sleep( |
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431 | unsigned int seconds |
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432 | ) |
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433 | { |
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434 | rtems_status_code status; |
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435 | rtems_interval ticks_per_second; |
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436 | rtems_interval ticks; |
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437 | |
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438 | status = rtems_clock_get( |
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439 | RTEMS_CLOCK_GET_TICKS_PER_SECOND, |
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440 | &ticks_per_second |
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441 | ); |
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442 | |
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443 | ticks = seconds * ticks_per_second; |
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444 | |
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445 | status = rtems_task_wake_after( ticks ); |
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446 | |
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447 | /* |
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448 | * Returns the "unslept" amount of time. In RTEMS signals are not |
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449 | * interruptable, so tasks really sleep all of the requested time. |
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450 | */ |
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451 | |
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452 | return 0; |
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453 | } |
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454 | #endif |
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455 | |
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456 | |
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457 | /* |
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458 | * Newlib Interface Support |
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459 | * |
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460 | * Routines to Access Internal RTEMS Resources without violating |
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461 | * kernel visibility. |
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462 | * |
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463 | */ |
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464 | |
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465 | void MY_task_set_note( |
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466 | Thread_Control *the_thread, |
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467 | unsigned32 notepad, |
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468 | unsigned32 note |
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469 | ) |
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470 | { |
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471 | RTEMS_API_Control *api; |
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472 | |
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473 | api = the_thread->API_Extensions[ THREAD_API_RTEMS ]; |
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474 | |
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475 | if ( api ) |
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476 | api->Notepads[ notepad ] = note; |
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477 | } |
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478 | |
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479 | |
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480 | unsigned32 MY_task_get_note( |
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481 | Thread_Control *the_thread, |
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482 | unsigned32 notepad |
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483 | ) |
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484 | { |
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485 | RTEMS_API_Control *api; |
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486 | |
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487 | api = the_thread->API_Extensions[ THREAD_API_RTEMS ]; |
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488 | |
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489 | return api->Notepads[ notepad ]; |
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490 | } |
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491 | |
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492 | void *MY_CPU_Context_FP_start( |
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493 | void *base, |
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494 | unsigned32 offset |
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495 | ) |
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496 | { |
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497 | return _CPU_Context_Fp_start( base, offset ); |
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498 | } |
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499 | #endif |
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