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Input-Section-Example.html 4.7KB

il y a 3 ans
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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  2. <html>
  3. <!-- This file documents the GNU linker LD
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  16. <title>Input Section Example (LD)</title>
  17. <meta name="description" content="Input Section Example (LD)">
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  22. <link href="index.html#Top" rel="start" title="Top">
  23. <link href="LD-Index.html#LD-Index" rel="index" title="LD Index">
  24. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
  25. <link href="Input-Section.html#Input-Section" rel="up" title="Input Section">
  26. <link href="Output-Section-Data.html#Output-Section-Data" rel="next" title="Output Section Data">
  27. <link href="Input-Section-Keep.html#Input-Section-Keep" rel="prev" title="Input Section Keep">
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  55. </head>
  56. <body lang="en">
  57. <a name="Input-Section-Example"></a>
  58. <div class="header">
  59. <p>
  60. Previous: <a href="Input-Section-Keep.html#Input-Section-Keep" accesskey="p" rel="prev">Input Section Keep</a>, Up: <a href="Input-Section.html#Input-Section" accesskey="u" rel="up">Input Section</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p>
  61. </div>
  62. <hr>
  63. <a name="Input-Section-Example-1"></a>
  64. <h4 class="subsubsection">3.6.4.5 Input Section Example</h4>
  65. <p>The following example is a complete linker script. It tells the linker
  66. to read all of the sections from file <samp>all.o</samp> and place them at the
  67. start of output section &lsquo;<samp>outputa</samp>&rsquo; which starts at location
  68. &lsquo;<samp>0x10000</samp>&rsquo;. All of section &lsquo;<samp>.input1</samp>&rsquo; from file <samp>foo.o</samp>
  69. follows immediately, in the same output section. All of section
  70. &lsquo;<samp>.input2</samp>&rsquo; from <samp>foo.o</samp> goes into output section
  71. &lsquo;<samp>outputb</samp>&rsquo;, followed by section &lsquo;<samp>.input1</samp>&rsquo; from <samp>foo1.o</samp>.
  72. All of the remaining &lsquo;<samp>.input1</samp>&rsquo; and &lsquo;<samp>.input2</samp>&rsquo; sections from any
  73. files are written to output section &lsquo;<samp>outputc</samp>&rsquo;.
  74. </p>
  75. <div class="smallexample">
  76. <pre class="smallexample">SECTIONS {
  77. outputa 0x10000 :
  78. {
  79. all.o
  80. foo.o (.input1)
  81. }
  82. </pre><pre class="smallexample"> outputb :
  83. {
  84. foo.o (.input2)
  85. foo1.o (.input1)
  86. }
  87. </pre><pre class="smallexample"> outputc :
  88. {
  89. *(.input1)
  90. *(.input2)
  91. }
  92. }
  93. </pre></div>
  94. <p>If an output section&rsquo;s name is the same as the input section&rsquo;s name
  95. and is representable as a C identifier, then the linker will
  96. automatically see <a href="PROVIDE.html#PROVIDE">PROVIDE</a> two symbols: __start_SECNAME and
  97. __stop_SECNAME, where SECNAME is the name of the section. These
  98. indicate the start address and end address of the output section
  99. respectively. Note: most section names are not representable as
  100. C identifiers because they contain a &lsquo;<samp>.</samp>&rsquo; character.
  101. </p>
  102. </body>
  103. </html>