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annotate packages/hal/synth/arch/current/src/synth_entry.c @ 448:c3adb3b974a2

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Update synthetic target to cope with recent gcc changes
author bartv
date Tue, 03 Dec 2002 21:07:24 +0000
parents 7c1c8dc43ba1
children c04ca65eec48
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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) 2002 Bart Veer
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12 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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13 //
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14 // eCos is free software; you can redistribute it and/or modify it under
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15 // the terms of the GNU General Public License as published by the Free
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16 // Software Foundation; either version 2 or (at your option) any later version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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19 // 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 along
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24 // with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use macros
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28 // or inline functions from this file, or you compile this file and link it
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29 // with other works to produce a work based on this file, this file does not
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30 // by itself cause the resulting work to be covered by the GNU General Public
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31 // License. However the source code for this file must still be made available
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32 // in accordance with section (3) of the GNU General Public License.
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33 //
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34 // This exception does not invalidate any other reasons why a work based on
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35 // this file might be covered by the GNU General Public License.
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36 //
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37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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38 // at http://sources.redhat.com/ecos/ecos-license/
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39 // -------------------------------------------
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40 //####ECOSGPLCOPYRIGHTEND####
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41 //==========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): proven
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45 // Contributors:proven, jskov, bartv
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46 // Date: 1999-01-06
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47 // Purpose: Entry point for Linux synthetic target.
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //=========================================================================
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52
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53 #include <pkgconf/system.h>
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54 #include <pkgconf/hal.h>
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55 #include <cyg/infra/cyg_type.h>
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56 #include <cyg/infra/cyg_ass.h>
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57 #include <cyg/hal/hal_arch.h>
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58 #include <cyg/hal/hal_intr.h>
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59 #include <cyg/hal/hal_io.h>
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60 #include CYGHWR_MEMORY_LAYOUT_H
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61
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62 /*------------------------------------------------------------------------*/
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63 /* C++ support - run initial constructors */
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64
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65 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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66 cyg_bool cyg_hal_stop_constructors;
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67 #endif
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68
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69 typedef void (*pfunc) (void);
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70 extern pfunc __CTOR_LIST__[];
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71 extern pfunc __CTOR_END__[];
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72
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73 void
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74 cyg_hal_invoke_constructors (void)
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75 {
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76 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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77 static pfunc *p = &__CTOR_END__[-1];
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78
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79 cyg_hal_stop_constructors = 0;
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80 for (; p >= __CTOR_LIST__; p--) {
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81 (*p) ();
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82 if (cyg_hal_stop_constructors) {
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83 p--;
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84 break;
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85 }
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86 }
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87 #else
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88 pfunc *p;
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89
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90 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
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91 (*p) ();
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92 #endif
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93 }
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94
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95 // ----------------------------------------------------------------------------
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96 // The low-level entry point is platform-specific, typically in the
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97 // assember file vectors.S. However that entry point simply jumps
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98 // directly here, with no further processing or stack manipulation.
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99 // The HAL specification defines clearly what should happen during
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100 // startup.
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101
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102 externC void cyg_start( void );
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103 externC void synth_hardware_init(void);
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104 externC void synth_hardware_init2(void);
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105
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106 void _linux_entry( void )
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107 {
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108 void* new_top = (void*) 0;
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109
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110 // "Initialize various cpu status registers, including disabling interrupts."
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111 // That is a no-op for the synthetic target, in particular interrupts are
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112 // already disabled.
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113
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114 // "Set up any CPU memory controller to access ROM, RAM, and I/O devices
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115 // correctly".
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116 //
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117 // This involves using the brk() system call to allocate the RAM used
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118 // for the heaps. There are no variables mapped there so the system
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119 // will not have done this for us. Note that the implementation of
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120 // brk() (mm/mmap.c) differs from the documentation - the return
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121 // value is the new brk value, not an error code.
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122 new_top = (void*) (CYGMEM_REGION_ram + CYGMEM_REGION_ram_SIZE);
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123 if (new_top != cyg_hal_sys_brk(new_top)) {
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124 CYG_FAIL("Failed to initialize memory");
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125 cyg_hal_sys_exit(1);
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126 }
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127
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128 // Again a no-op for the synthetic target. All memory is readily
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129 // accessible. Arguably the auxiliary should be started up here, but
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130 // instead that is left to platform initialization.
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131
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132 // "Enable the cache". Effectively the synthetic target has no cache,
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133 // anything provided by the hardware is not readily accessible.
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134
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135 // "Set up the stack pointer". The system starts up a program with a
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136 // suitable stack.
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137
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138 // "Initialize any global pointer register". There is no such register.
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139
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140 // Perform platform-specific initialization. Actually, all Linux
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141 // platforms can share this. It involves setting up signal handlers,
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142 // starting the I/O auxiliary, and so on.
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143 synth_hardware_init();
161
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144
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145 // This is not a ROM startup, so no need to worry about copying the
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146 // .data section.
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147
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148 // "Zero the .bss section". Linux will have done this for us.
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149
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150 // "Create a suitable C stack frame". Already done.
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151
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152 // Invoke the C++ constructors.
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153 cyg_hal_invoke_constructors();
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154
332
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155 // Once the C++ constructors have been invoked, a second stage
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156 // of hardware initialization is desirable. At this point all
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157 // eCos device drivers should have been initialized so the
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158 // I/O auxiliary will have loaded the appropriate support
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159 // scripts, and the auxiliary can now map the window(s) on to
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160 // the display and generally operate normally.
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161 synth_hardware_init2();
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162
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163 // "Call cyg_start()". OK.
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164 cyg_start();
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165
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166 // "Drop into an infinite loop". Not a good idea for the synthetic
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167 // target. Instead, exit.
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168 cyg_hal_sys_exit(0);
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169 }
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170
448
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171 // ----------------------------------------------------------------------------
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172 // Versions of gcc/g++ after 3.0 (approx.), when configured for Linux
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173 // native development (specifically, --with-__cxa_enable), have
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174 // additional dependencies related to the destructors for static
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175 // objects. When compiling C++ code with static objects the compiler
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176 // inserts a call to __cxa_atexit() with __dso_handle as one of the
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177 // arguments. __cxa_atexit() would normally be provided by glibc, and
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178 // __dso_handle is part of crtstuff.c. Synthetic target applications
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179 // are linked rather differently, so either a differently-configured
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180 // compiler is needed or dummy versions of these symbols should be
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181 // provided. If these symbols are not actually used then providing
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182 // them is still harmless, linker garbage collection will remove them.
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183
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184 void
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185 __cxa_atexit(void (*arg1)(void*), void* arg2, void* arg3)
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186 {
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187 }
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188 void* __dso_handle = (void*) &__dso_handle;
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189
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190 //-----------------------------------------------------------------------------
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191 // End of entry.c