1 | /* |
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2 | * This file contains directives for the GNU linker which are specific |
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3 | * to the Technologic Systems TS-1325 (i386ex) board. |
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4 | * |
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5 | * Copyright (c) 1989-1998. |
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6 | * On-Line Applications Research Corporation (OAR). |
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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 | * Memory layout: |
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15 | * |
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16 | * 0x0008000 -> ... : initial section ( init 386ex, goto protected mode) |
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17 | * ... -> ... : text section ( executable code ) |
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18 | * ... -> 0x00A0000 : data section ( initialized storage ) |
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19 | * 0x0100000 -> 0x0200000 : bss section, stack space, heap storage |
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20 | */ |
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21 | |
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22 | ENTRY(_init_i386ex) ; |
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23 | |
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24 | SECTIONS |
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25 | { |
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26 | |
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27 | /*************************************************************************** |
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28 | * initial section: |
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29 | * |
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30 | * This subsection of ".text" is the first in memory, and executed by the DOS |
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31 | * loader. It initializes the i386ex, sets up the gdt in RAM, loads the gdt, |
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32 | * jumps to protected mode, loads the idt, zeros the bss section, sets up |
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33 | * the stack and calls the rest of the RTEMS initialization. |
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34 | ***************************************************************************/ |
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35 | |
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36 | _DOS_ld_addr = 0x0008000 ; |
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37 | |
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38 | /*************************************************************************** |
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39 | * text section: |
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40 | * |
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41 | * Nobody here but us opcodes. |
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42 | ***************************************************************************/ |
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43 | |
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44 | .text _DOS_ld_addr : |
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45 | { |
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46 | CREATE_OBJECT_SYMBOLS |
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47 | text_start = . ; |
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48 | _text_start = . ; |
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49 | |
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50 | *(.initial); |
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51 | . = ALIGN(0x20); |
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52 | |
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53 | *(.text ); |
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54 | . = ALIGN (0x20); |
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55 | |
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56 | *(.eh_frame) |
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57 | . = ALIGN (0x20); |
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58 | |
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59 | *(.gnu.linkonce.t*) |
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60 | . = ALIGN(0x20); |
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61 | |
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62 | /* |
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63 | * C++ constructors |
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64 | */ |
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65 | |
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66 | __CTOR_LIST__ = .; |
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67 | LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) |
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68 | *(.ctors) |
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69 | LONG(0) |
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70 | __CTOR_END__ = .; |
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71 | . = ALIGN (4) ; |
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72 | __DTOR_LIST__ = .; |
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73 | LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2) |
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74 | *(.dtors) |
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75 | LONG(0) |
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76 | __DTOR_END__ = .; |
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77 | |
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78 | _rodata_start = . ; |
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79 | *(.rodata*) |
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80 | . = ALIGN(0x20); |
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81 | _erodata = .; |
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82 | |
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83 | *(.gnu.linkonce.r*) |
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84 | . = ALIGN(0x20); |
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85 | _endtext = . ; |
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86 | } |
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87 | |
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88 | /*************************************************************************** |
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89 | * ctor/dtor sections: |
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90 | * |
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91 | * These sections house the global constructors and destructors. |
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92 | ***************************************************************************/ |
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93 | |
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94 | .init BLOCK(0x20) : |
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95 | { |
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96 | *(.init) |
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97 | } = 0x9090 |
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98 | |
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99 | .fini BLOCK(0x20) : |
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100 | { |
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101 | *(.fini) |
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102 | } = 0x9090 |
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103 | |
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104 | /*************************************************************************** |
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105 | * data section: |
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106 | * |
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107 | * This section defines the location of the data section in RAM. |
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108 | ***************************************************************************/ |
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109 | |
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110 | .data BLOCK(0x20) : |
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111 | { |
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112 | _sdata = .; |
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113 | *(.data); |
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114 | . = ALIGN(0x20); |
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115 | *(.gnu.linkonce.d*) |
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116 | . = ALIGN(0x20); |
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117 | *(.gcc_except_table) |
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118 | . = ALIGN(0x20); |
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119 | _edata = .; |
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120 | } |
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121 | _data_size = _edata - _sdata ; |
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122 | |
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123 | /*************************************************************************** |
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124 | * bss section: |
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125 | * |
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126 | * The bss section is the first section in extended RAM ( > 1MB). |
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127 | ***************************************************************************/ |
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128 | |
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129 | .bss 0x100000 (NOLOAD) : |
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130 | { |
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131 | _bss_start = .; |
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132 | *(.bss); |
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133 | *(COMMON); |
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134 | _ebss = ALIGN(0x20); |
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135 | } |
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136 | _bss_size = _ebss - _bss_start ; |
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137 | |
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138 | /*************************************************************************** |
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139 | * discard section: |
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140 | * |
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141 | * This section is used to throw away stuff we don't want. |
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142 | ***************************************************************************/ |
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143 | |
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144 | /DISCARD/ : |
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145 | { |
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146 | *(.comment); |
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147 | *(.note); |
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148 | } |
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149 | |
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150 | /*************************************************************************** |
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151 | * General variables: |
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152 | * |
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153 | * The stack_size variable is customizable here. The heap is located directly |
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154 | * after the stack in RAM. A routine within bspstart.c uses these variables |
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155 | * to ensure that the heap used by RTEMS is as large as the RAM remaining |
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156 | * after all workspace configurations are complete. |
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157 | ***************************************************************************/ |
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158 | |
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159 | stack_size = 0x8000 ; |
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160 | stack_origin = _ebss + stack_size ; |
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161 | heap_bottom = stack_origin + 4 ; |
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162 | |
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163 | |
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164 | |
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165 | /* Stabs debugging sections. */ |
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166 | .stab 0 : { *(.stab) } |
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167 | .stabstr 0 : { *(.stabstr) } |
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168 | .stab.excl 0 : { *(.stab.excl) } |
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169 | .stab.exclstr 0 : { *(.stab.exclstr) } |
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170 | .stab.index 0 : { *(.stab.index) } |
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171 | .stab.indexstr 0 : { *(.stab.indexstr) } |
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172 | .comment 0 : { *(.comment) } |
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173 | |
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174 | /* DWARF debug sections. |
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175 | Symbols in the DWARF debugging sections are relative to the beginning |
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176 | of the section so we begin them at 0. */ |
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177 | /* DWARF 1 */ |
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178 | .debug 0 : { *(.debug) } |
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179 | .line 0 : { *(.line) } |
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180 | |
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181 | /* GNU DWARF 1 extensions */ |
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182 | .debug_srcinfo 0 : { *(.debug_srcinfo) } |
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183 | .debug_sfnames 0 : { *(.debug_sfnames) } |
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184 | |
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185 | /* DWARF 1.1 and DWARF 2 */ |
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186 | .debug_aranges 0 : { *(.debug_aranges) } |
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187 | .debug_pubnames 0 : { *(.debug_pubnames) } |
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188 | |
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189 | /* DWARF 2 */ |
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190 | .debug_info 0 : { *(.debug_info) } |
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191 | .debug_abbrev 0 : { *(.debug_abbrev) } |
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192 | .debug_line 0 : { *(.debug_line) } |
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193 | .debug_frame 0 : { *(.debug_frame) } |
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194 | .debug_str 0 : { *(.debug_str) } |
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195 | .debug_loc 0 : { *(.debug_loc) } |
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196 | .debug_macinfo 0 : { *(.debug_macinfo) } |
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197 | |
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198 | /* SGI/MIPS DWARF 2 extensions */ |
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199 | .debug_weaknames 0 : { *(.debug_weaknames) } |
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200 | .debug_funcnames 0 : { *(.debug_funcnames) } |
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201 | .debug_typenames 0 : { *(.debug_typenames) } |
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202 | .debug_varnames 0 : { *(.debug_varnames) } |
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203 | /* These must appear regardless of . */ |
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204 | } |
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