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annotate packages/hal/synth/arch/current/src/synth_entry.c @ 3291:68c8985fd5f0

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* src/synth.ld src/synth_entry.c: Look for static constructors in the .init_array section as well as .ctors (needed for gcc 4.7 and later)
author jlarmour
date Fri, 03 Oct 2014 15:13:21 +0000
parents 74dbf4c3f2e1
children
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1 //==========================================================================
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2 //
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3 // synth_entry.c
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4 //
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5 // Entry code for Linux synthetic target.
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): proven
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43 // Contributors:proven, jskov, bartv
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44 // Date: 1999-01-06
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45 // Purpose: Entry point for Linux synthetic target.
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46 //
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47 //####DESCRIPTIONEND####
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48 //
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49 //=========================================================================
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50
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51 #include <pkgconf/system.h>
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52 #include <pkgconf/hal.h>
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53 #include <cyg/infra/cyg_type.h>
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54 #include <cyg/infra/cyg_ass.h>
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55 #include <cyg/infra/diag.h>
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56 #include <cyg/hal/hal_arch.h>
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57 #include <cyg/hal/hal_intr.h>
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58 #include <cyg/hal/hal_io.h>
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59 #include CYGHWR_MEMORY_LAYOUT_H
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60
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61 /*------------------------------------------------------------------------*/
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62 /* C++ support - run initial constructors */
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63
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64 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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65 cyg_bool cyg_hal_stop_constructors;
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66 #endif
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67
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68 typedef void (*pfunc) (void);
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69 extern pfunc __CTOR_LIST__[];
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70 extern pfunc __CTOR_END__[];
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71 extern pfunc __init_array_start__[];
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72 extern pfunc __init_array_end__[];
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73
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74 void
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75 cyg_hal_invoke_constructors (void)
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76 {
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77 /* Note: We appear to be running the constructors twice here, but
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78 * this is not actually the case.
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79 * gcc 4.7 changed the way static constructors are linked:
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80 * - Prior to gcc 4.7, they appeared in the .ctors section of the
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81 * ELF * image.
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82 * - Since gcc 4.7, they moved to .init_array and in the reverse
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83 * order.
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84 *
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85 * For us to look for both (both here and in synth.ld) is harmless,
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86 * because the constructors are only linked once, and we are not
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87 * too worried about squeezing every last byte of code size out of
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88 * the synth target.
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89 *
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90 * - wry, 2014-10-01
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91 */
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92 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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93 static pfunc *p = &__CTOR_END__[-1];
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94
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95 cyg_hal_stop_constructors = 0;
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96 for (; p >= __CTOR_LIST__; p--) {
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97 (*p) ();
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98 if (cyg_hal_stop_constructors) {
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99 p--;
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100 break;
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101 }
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102 }
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103 for (p = &__init_array_start__[0]; p != (__init_array_end__); p++) {
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104 (*p) ();
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105 if (cyg_hal_stop_constructors) {
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106 p++;
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107 break;
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108 }
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109 }
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110 #else
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111 pfunc *p;
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112
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113 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
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114 (*p) ();
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115 for (p = &__init_array_start__[0]; p != (__init_array_end__); p++)
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116 (*p) ();
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117 #endif
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118 }
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119
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120 // ----------------------------------------------------------------------------
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121 // The low-level entry point is platform-specific, typically in the
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122 // assember file vectors.S. However that entry point simply jumps
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123 // directly here, with no further processing or stack manipulation.
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124 // The HAL specification defines clearly what should happen during
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125 // startup.
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126
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127 externC void cyg_start( void );
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128 externC void synth_hardware_init(void);
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129 externC void synth_hardware_init2(void);
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130
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131 void _linux_entry( void )
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132 {
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133 // "Initialize various cpu status registers, including disabling interrupts."
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134 // That is a no-op for the synthetic target, in particular interrupts are
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135 // already disabled.
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136
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137 // "Set up any CPU memory controller to access ROM, RAM, and I/O
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138 // devices correctly". The ROM and RAM are set up via the linker
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139 // script and taken care of automatically during loading. There
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140 // are no memory-mapped devices. Arguably the auxiliary should be
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141 // started up here, but instead that is left to platform
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142 // initialization.
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143
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144 // "Enable the cache". Effectively the synthetic target has no cache,
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145 // anything provided by the hardware is not readily accessible.
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146
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147 // "Set up the stack pointer". The system starts up a program with a
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148 // suitable stack.
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149
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150 // "Initialize any global pointer register". There is no such register.
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151
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152 // Perform platform-specific initialization. Actually, all Linux
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153 // platforms can share this. It involves setting up signal handlers,
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154 // starting the I/O auxiliary, and so on.
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155 synth_hardware_init();
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156
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157 // This is not a ROM startup, so no need to worry about copying the
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158 // .data section.
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159
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160 // "Zero the .bss section". Linux will have done this for us.
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161
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162 // "Create a suitable C stack frame". Already done.
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163
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164 // Invoke the C++ constructors.
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165 cyg_hal_invoke_constructors();
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166
332
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167 // Once the C++ constructors have been invoked, a second stage
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168 // of hardware initialization is desirable. At this point all
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169 // eCos device drivers should have been initialized so the
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170 // I/O auxiliary will have loaded the appropriate support
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171 // scripts, and the auxiliary can now map the window(s) on to
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172 // the display and generally operate normally.
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173 synth_hardware_init2();
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174
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175 // "Call cyg_start()". OK.
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176 cyg_start();
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177
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178 // "Drop into an infinite loop". Not a good idea for the synthetic
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179 // target. Instead, exit.
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180 cyg_hal_sys_exit(0);
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181 }
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182
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183 // ----------------------------------------------------------------------------
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184 // Stub functions needed for linking with various versions of gcc
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185 // configured for Linux rather than i386-elf.
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186
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187 #if (__GNUC__ < 3)
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188 // 2.95.x libgcc.a __pure_virtual() calls __write().
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189 int __write(void)
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190 {
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191 return -1;
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192 }
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193 #endif
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194
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195 #if (__GNUC__ >= 3)
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196 // Versions of gcc/g++ after 3.0 (approx.), when configured for Linux
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197 // native development (specifically, --with-__cxa_enable), have
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198 // additional dependencies related to the destructors for static
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199 // objects. When compiling C++ code with static objects the compiler
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200 // inserts a call to __cxa_atexit() with __dso_handle as one of the
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201 // arguments. __cxa_atexit() would normally be provided by glibc, and
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202 // __dso_handle is part of crtstuff.c. Synthetic target applications
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203 // are linked rather differently, so either a differently-configured
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204 // compiler is needed or dummy versions of these symbols should be
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205 // provided. If these symbols are not actually used then providing
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206 // them is still harmless, linker garbage collection will remove them.
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207
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208 void
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209 __cxa_atexit(void (*arg1)(void*), void* arg2, void* arg3)
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210 {
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211 }
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212 void* __dso_handle = (void*) &__dso_handle;
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213
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214 // gcc 3.2.2 (approx). The libsupc++ version of the new operator pulls
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215 // in exception handling code, even when using the nothrow version and
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216 // building with -fno-exceptions. libgcc_eh.a provides the necessary
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217 // functions, but requires a dl_iterate_phdr() function. That is related
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218 // to handling dynamically loaded code so is not applicable to eCos.
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219 int
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220 dl_iterate_phdr(void* arg1, void* arg2)
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221 {
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222 return -1;
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223 }
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224 #endif
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225
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226 #if (__GNUC__ >= 4)
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227 // First noticed with gcc 4.1.1. There is now code to detect stack
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228 // smashing.
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229 void __attribute__ ((noreturn))
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230 __stack_chk_fail_local(void)
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231 {
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232 CYG_FAIL("Stack smashing detected, aborting");
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233 diag_printf("Application error: stack smashing detected.\n");
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234 cyg_hal_sys_exit(1);
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235 for (;;);
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236 }
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237 // Another symbol which indicates a similar problem occurred.
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238 void __stack_chk_fail(void)
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239 {
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240 __stack_chk_fail_local();
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241 }
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242 #endif
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243
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244 //-----------------------------------------------------------------------------
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245 // End of entry.c