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1 //======================================================================= |
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2 // |
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3 // cstartup.cxx |
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4 // |
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5 // Starting C library support |
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6 // |
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7 //======================================================================== |
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8 //####COPYRIGHTBEGIN#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus eCos Public License |
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12 // Version 1.0 (the "License"); you may not use this file except in |
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13 // compliance with the License. You may obtain a copy of the License at |
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14 // http://sourceware.cygnus.com/ecos |
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15 // |
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16 // Software distributed under the License is distributed on an "AS IS" |
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 // License for the specific language governing rights and limitations under |
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19 // the License. |
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20 // |
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21 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //======================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour |
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33 // Contributors: jlarmour@cygnus.co.uk |
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34 // Date: 1998-08-27 |
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35 // Purpose: |
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36 // Description: |
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37 // Usage: |
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38 // |
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39 //####DESCRIPTIONEND#### |
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40 // |
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41 //======================================================================== |
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42 |
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43 // CONFIGURATION |
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44 |
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45 #include <pkgconf/libc.h> // Configuration header |
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46 |
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47 // Include the C library? |
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48 #ifdef CYGPKG_LIBC |
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49 |
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50 // INCLUDES |
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51 |
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52 #include <cyg/infra/cyg_type.h> // Common type definitions and support |
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53 #include <cyg/infra/cyg_trac.h> // Common tracing support |
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54 #include <cyg/infra/cyg_ass.h> // Common assertion support |
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55 #include "clibincl/stdlibsupp.hxx" // __libc_exit() ( i.e. exit() ) |
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56 |
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57 #ifdef CYGPKG_KERNEL |
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58 # include <cyg/kernel/thread.hxx> // eCos thread support |
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59 # include <cyg/kernel/thread.inl> |
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60 #endif |
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61 |
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62 |
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63 // FUNCTION PROTOTYPES |
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64 |
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65 // We provide a weakly named main to allow this to link if the user |
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66 // doesn't provide their own main. This isn't strictly good behaviour, |
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67 // but if the user wants good performance then of _course_ they should |
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68 // play with the config options and this won't be called. Or it might |
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69 // be "giving them enough rope" etc. :-) |
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70 |
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71 // The definition of the normal user-supplied main() is here aliased |
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72 // to a dummy main function. It isn't called main itself in order to |
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73 // throw GDB off the scent, which otherwise gets confused. These |
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74 // attributes have no effect on a user-supplied main() if one is supplied |
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75 |
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76 externC int |
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77 cyg_libc_dummy_main( int argc, char *argv[] ); |
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78 |
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79 externC int |
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80 main( int argc, char *argv[] ) |
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81 CYGPRI_LIBC_WEAK_ALIAS("cyg_libc_dummy_main"); |
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82 |
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83 static inline void |
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84 invoke_main( CYG_ADDRWORD ); |
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85 |
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86 // STATICS |
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87 |
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88 #ifdef CYGPKG_KERNEL |
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89 static cyg_uint8 main_stack[ CYGNUM_LIBC_MAIN_STACK_SIZE ]; |
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90 |
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91 |
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92 // GLOBALS |
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93 |
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94 // let the main thread be global so people can play with it (e.g. suspend |
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95 // or resume etc.) if that's what they want to do |
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96 Cyg_Thread cyg_libc_main_thread( &invoke_main, (CYG_ADDRWORD) 0, |
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97 CYGNUM_LIBC_MAIN_STACK_SIZE, |
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98 (CYG_ADDRESS) &main_stack ); |
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99 #endif |
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100 |
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101 |
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102 // FUNCTIONS |
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103 |
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104 externC int |
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105 cyg_libc_dummy_main( int argc, char *argv[] ) |
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106 { |
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107 CYG_REPORT_FUNCNAMETYPE("main", "returning %d" ); |
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108 |
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109 // try to be helpful by diagnosing malformed arguments |
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110 CYG_PRECONDITION( argv != NULL, "argv is NULL!" ); |
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111 CYG_PRECONDITION( argv[argc] == NULL, "argv[argc] isn't NULL!" ); |
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112 |
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113 CYG_REPORT_FUNCARG2("argc=%d, argv[0]=%s", argc, |
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114 (argv[0]==NULL) ? "NULL" : argv[0] ); |
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115 |
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116 CYG_TRACE0( true, "This is the system-supplied default main()" ); |
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117 |
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118 CYG_REPORT_RETVAL(0); |
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119 return 0; // some CPUs have 0 hard-wired - faster than a reg |
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120 } |
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121 |
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122 // Making invoke_main() static inline has no effect if the kernel is |
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123 // present, and makes it inline if not! Cor. |
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124 static inline void |
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125 invoke_main( CYG_ADDRWORD ) |
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126 { |
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127 CYG_REPORT_FUNCNAME( "invoke_main" ); |
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128 CYG_REPORT_FUNCARG1( "argument is %s", "ignored" ); |
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129 |
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130 // argv[argc] must be NULL according to the ISO C standard 5.1.2.2.1 |
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131 char *temp_argv[] = CYGDAT_LIBC_ARGUMENTS ; |
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132 int rc; |
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133 |
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134 rc = main( (sizeof(temp_argv)/sizeof(char *)) - 1, &temp_argv[0] ); |
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135 |
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136 CYG_TRACE1( true, "main() has returned with code %d. Calling exit()", |
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137 rc ); |
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138 |
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139 __libc_exit(rc); |
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140 |
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141 CYG_FAIL( "__libc_exit() returned!!!" ); |
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142 |
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143 CYG_REPORT_RETURN(); |
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144 |
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145 } // invoke_main(); |
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146 |
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147 externC void |
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148 cyg_iso_c_start( void ) |
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149 { |
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150 CYG_REPORT_FUNCNAME( "cyg_iso_c_start" ); |
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151 CYG_REPORT_FUNCARGVOID(); |
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152 |
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153 #ifdef CYGPKG_KERNEL |
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154 CYG_TRACE0( true, "Resuming cyg_libc_main_thread" ); |
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155 cyg_libc_main_thread.resume(); |
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156 #else |
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157 invoke_main(0); |
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158 #endif |
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159 |
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160 CYG_REPORT_RETURN(); |
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161 } // cyg_iso_c_start() |
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162 |
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163 |
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164 #endif // ifdef CYGPKG_LIBC |
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165 |
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166 // EOF cstartup.cxx |
