annotate docs/manual/x807.html @ 258:ebda5c96665e

Improved stack handling for os9 target in lwlink Added "stack" as a valid symbol in the __os9 section. All instances of __os9 are now polled for "stack" symobls and the values added to the stack size set in the linker script. The stack size is then added to the final data size of the module. Also set a default minimum stack size of 32 bytes.
author William Astle <lost@l-w.ca>
date Thu, 31 Jan 2013 19:34:54 -0700
parents 155799f6cfa5
children c4853a54b4a1
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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2 <HTML
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3 ><HEAD
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4 ><TITLE
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5 >Linking Scripts</TITLE
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6 ><META
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7 NAME="GENERATOR"
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8 CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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9 REL="HOME"
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10 TITLE="LW Tool Chain"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="LWLINK"
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14 HREF="c693.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="Linker Operation"
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17 HREF="x793.html"><LINK
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18 REL="NEXT"
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19 TITLE="Format Specific Linking Notes"
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20 HREF="x864.html"></HEAD
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21 ><BODY
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22 CLASS="SECTION"
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23 BGCOLOR="#FFFFFF"
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24 TEXT="#000000"
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25 LINK="#0000FF"
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26 VLINK="#840084"
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27 ALINK="#0000FF"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >LW Tool Chain</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="x793.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 >Chapter 4. LWLINK</TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="x864.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><DIV
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72 CLASS="SECTION"
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73 ><H1
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74 CLASS="SECTION"
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75 ><A
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76 NAME="AEN807"
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77 >4.3. Linking Scripts</A
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78 ></H1
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79 ><P
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80 >A linker script is used to instruct the linker about how to assemble the
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81 various sections into a completed binary. It consists of a series of
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82 directives which are considered in the order they are encountered.</P
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83 ><P
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84 >The sections will appear in the resulting binary in the order they are
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85 specified in the script file. If a referenced section is not found, the linker will behave as though the
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86 section did exist but had a zero size, no relocations, and no exports.
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87 A section should only be referenced once. Any subsequent references will have
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88 an undefined effect.</P
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89 ><P
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90 >All numbers are in linking scripts are specified in hexadecimal. All directives
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91 are case sensitive although the hexadecimal numbers are not.</P
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92 ><P
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93 >A section name can be specified as a "*", then any section not
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94 already matched by the script will be matched. The "*" can be followed
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95 by a comma and a flag to narrow the section down slightly, also.
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96 If the flag is "!bss", then any section that is not flagged as a bss section
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97 will be matched. If the flag is "bss", then any section that is flagged as
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98 bss will be matched.</P
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99 ><P
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100 >The following directives are understood in a linker script.</P
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101 ><P
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102 ></P
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103 ><DIV
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104 CLASS="VARIABLELIST"
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105 ><DL
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106 ><DT
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107 >sectopt <CODE
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108 CLASS="PARAMETER"
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109 >section</CODE
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110 > padafter <CODE
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111 CLASS="PARAMETER"
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112 >byte,...</CODE
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113 ></DT
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114 ><DD
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115 ><P
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116 >&#13;This will cause the linker to append the specified list of byte values
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117 (specified in hexadecimal separated by commas) to the end of the named
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118 section. This is done once all instances of the specified section are
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119 collected together. This has no effect if the specified section does not
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120 appear anywhere in any of the objects specified for linking. &#13;</P
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121 ><P
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122 >&#13;If code depends on the presence of this padding somewhere, it is sufficient
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123 to include an empty section of the specified name in the object that depends
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124 on it.&#13;</P
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125 ></DD
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126 ><DT
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127 >define basesympat <CODE
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128 CLASS="PARAMETER"
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129 >string</CODE
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130 ></DT
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131 ><DD
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132 ><P
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133 >&#13;This causes the linker to define a symbol for the ultimate base address of
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134 each section using the pattern specified by <CODE
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135 CLASS="PARAMETER"
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136 >string</CODE
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137 >.
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138 In the string, %s can appear exactly once and will be replaced with the
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139 section name. The base address is calculated after all instances of each
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140 section have been collapsed together.&#13;</P
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141 ><P
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142 >&#13;It should be noted that if none of the objects to be linked contains a
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143 particular section name, there will be no base symbol defined for it, even
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144 if it is listed explicitly in the link script. If code depends on the
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145 presence of these symbols, it is sufficient to include an empty section of
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146 the specified name in the object that depends on it.&#13;</P
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147 ><P
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148 > If the pattern resolves to the same string for multiple
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149 sections, the results are undefined.&#13;</P
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150 ></DD
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151 ><DT
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152 >define lensympat <CODE
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153 CLASS="PARAMETER"
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154 >string</CODE
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155 ></DT
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156 ><DD
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157 ><P
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158 >&#13;This causes the linker to define a symbol for the ultimate length of each
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159 section using the pattern specified by <CODE
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160 CLASS="PARAMETER"
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161 >string</CODE
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162 >. In
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163 the string, %s can appear exactly once and will be replaced with the section
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164 name. The length is calculated after all instances of a section have been
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165 collapsed together.&#13;</P
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166 ><P
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167 >&#13;It should be noted that if none of the objects to be linked contains a
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168 particular section name, there will be no length symbol defined for it, even
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169 if it is listed explicitly in the link script. If code depends on the
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170 presence of these symbols, it is sufficient to include an empty section of
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171 the specified name in the object that depends on it.&#13;</P
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172 ><P
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173 >If the pattern resolves to the same string for multiple
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174 sections, the results are undefined.&#13;</P
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175 ></DD
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176 ><DT
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177 >section <CODE
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178 CLASS="PARAMETER"
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179 >name</CODE
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180 > load <CODE
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181 CLASS="PARAMETER"
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182 >addr</CODE
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183 ></DT
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184 ><DD
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185 ><P
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186 >&#13;This causes the section <CODE
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187 CLASS="PARAMETER"
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188 >name</CODE
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189 > to load at
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190 <CODE
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191 CLASS="PARAMETER"
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192 >addr</CODE
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193 >. For the raw target, only one "load at" entry is
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194 allowed for non-bss sections and it must be the first one. For raw targets,
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195 it affects the addresses the linker assigns to symbols but has no other
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196 affect on the output. bss sections may all have separate load addresses but
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197 since they will not appear in the binary anyway, this is okay.</P
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198 ><P
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199 >For the decb target, each "load" entry will cause a new "block" to be
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200 output to the binary which will contain the load address. It is legal for
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201 sections to overlap in this manner - the linker assumes the loader will sort
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202 everything out.</P
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203 ></DD
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204 ><DT
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205 >section <CODE
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206 CLASS="PARAMETER"
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207 >name</CODE
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208 ></DT
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209 ><DD
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210 ><P
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211 >&#13;This will cause the section <CODE
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212 CLASS="PARAMETER"
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213 >name</CODE
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214 > to load after the previously listed
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215 section.</P
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216 ></DD
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217 ><DT
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218 >entry <CODE
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219 CLASS="PARAMETER"
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220 >addr or sym</CODE
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221 ></DT
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222 ><DD
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223 ><P
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224 >This will cause the execution address (entry point) to be the address
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225 specified (in hex) or the specified symbol name. The symbol name must
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226 match a symbol that is exported by one of the object files being linked.
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227 This has no effect for targets that do not encode the entry point into the
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228 resulting file. If not specified, the entry point is assumed to be address 0
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229 which is probably not what you want. The default link scripts for targets
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230 that support this directive automatically starts at the beginning of the
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231 first section (usually "init" or "code") that is emitted in the binary.</P
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232 ></DD
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233 ><DT
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234 >pad <CODE
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235 CLASS="PARAMETER"
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236 >size</CODE
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237 ></DT
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238 ><DD
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239 ><P
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240 >This will cause the output file to be padded with NUL bytes to be exactly
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241 <CODE
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242 CLASS="PARAMETER"
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243 >size</CODE
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244 > bytes in length. This only makes sense for a raw target.</P
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245 ></DD
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246 ></DL
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247 ></DIV
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248 ></DIV
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249 ><DIV
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250 CLASS="NAVFOOTER"
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251 ><HR
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252 ALIGN="LEFT"
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253 WIDTH="100%"><TABLE
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254 SUMMARY="Footer navigation table"
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255 WIDTH="100%"
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256 BORDER="0"
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257 CELLPADDING="0"
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258 CELLSPACING="0"
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259 ><TR
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260 ><TD
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261 WIDTH="33%"
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262 ALIGN="left"
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263 VALIGN="top"
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264 ><A
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265 HREF="x793.html"
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266 ACCESSKEY="P"
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267 >Prev</A
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268 ></TD
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269 ><TD
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270 WIDTH="34%"
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271 ALIGN="center"
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272 VALIGN="top"
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273 ><A
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274 HREF="index.html"
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275 ACCESSKEY="H"
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276 >Home</A
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277 ></TD
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278 ><TD
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279 WIDTH="33%"
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280 ALIGN="right"
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281 VALIGN="top"
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282 ><A
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283 HREF="x864.html"
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284 ACCESSKEY="N"
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285 >Next</A
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286 ></TD
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287 ></TR
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288 ><TR
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289 ><TD
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290 WIDTH="33%"
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291 ALIGN="left"
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292 VALIGN="top"
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293 >Linker Operation</TD
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294 ><TD
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295 WIDTH="34%"
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296 ALIGN="center"
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297 VALIGN="top"
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298 ><A
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299 HREF="c693.html"
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300 ACCESSKEY="U"
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301 >Up</A
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302 ></TD
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303 ><TD
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304 WIDTH="33%"
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305 ALIGN="right"
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306 VALIGN="top"
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307 >Format Specific Linking Notes</TD
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308 ></TR
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309 ></TABLE
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310 ></DIV
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311 ></BODY
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312 ></HTML
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313 >