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Output-Section-Description.html 4.6KB

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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
  4. (GNU Arm Embedded Toolchain 10-2020-q4-major)
  5. version 2.35.1.
  6. Copyright (C) 1991-2020 Free Software Foundation, Inc.
  7. Permission is granted to copy, distribute and/or modify this document
  8. under the terms of the GNU Free Documentation License, Version 1.3
  9. or any later version published by the Free Software Foundation;
  10. with no Invariant Sections, with no Front-Cover Texts, and with no
  11. Back-Cover Texts. A copy of the license is included in the
  12. section entitled "GNU Free Documentation License". -->
  13. <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
  14. <head>
  15. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  16. <title>Output Section Description (LD)</title>
  17. <meta name="description" content="Output Section Description (LD)">
  18. <meta name="keywords" content="Output Section Description (LD)">
  19. <meta name="resource-type" content="document">
  20. <meta name="distribution" content="global">
  21. <meta name="Generator" content="makeinfo">
  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="SECTIONS.html#SECTIONS" rel="up" title="SECTIONS">
  26. <link href="Output-Section-Name.html#Output-Section-Name" rel="next" title="Output Section Name">
  27. <link href="SECTIONS.html#SECTIONS" rel="prev" title="SECTIONS">
  28. <style type="text/css">
  29. <!--
  30. a.summary-letter {text-decoration: none}
  31. blockquote.indentedblock {margin-right: 0em}
  32. blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
  33. blockquote.smallquotation {font-size: smaller}
  34. div.display {margin-left: 3.2em}
  35. div.example {margin-left: 3.2em}
  36. div.lisp {margin-left: 3.2em}
  37. div.smalldisplay {margin-left: 3.2em}
  38. div.smallexample {margin-left: 3.2em}
  39. div.smalllisp {margin-left: 3.2em}
  40. kbd {font-style: oblique}
  41. pre.display {font-family: inherit}
  42. pre.format {font-family: inherit}
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  45. pre.smalldisplay {font-family: inherit; font-size: smaller}
  46. pre.smallexample {font-size: smaller}
  47. pre.smallformat {font-family: inherit; font-size: smaller}
  48. pre.smalllisp {font-size: smaller}
  49. span.nolinebreak {white-space: nowrap}
  50. span.roman {font-family: initial; font-weight: normal}
  51. span.sansserif {font-family: sans-serif; font-weight: normal}
  52. ul.no-bullet {list-style: none}
  53. -->
  54. </style>
  55. </head>
  56. <body lang="en">
  57. <a name="Output-Section-Description"></a>
  58. <div class="header">
  59. <p>
  60. Next: <a href="Output-Section-Name.html#Output-Section-Name" accesskey="n" rel="next">Output Section Name</a>, Up: <a href="SECTIONS.html#SECTIONS" accesskey="u" rel="up">SECTIONS</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="Output-Section-Description-1"></a>
  64. <h4 class="subsection">3.6.1 Output Section Description</h4>
  65. <p>The full description of an output section looks like this:
  66. </p><div class="smallexample">
  67. <pre class="smallexample"><var>section</var> [<var>address</var>] [(<var>type</var>)] :
  68. [AT(<var>lma</var>)]
  69. [ALIGN(<var>section_align</var>) | ALIGN_WITH_INPUT]
  70. [SUBALIGN(<var>subsection_align</var>)]
  71. [<var>constraint</var>]
  72. {
  73. <var>output-section-command</var>
  74. <var>output-section-command</var>
  75. &hellip;
  76. } [&gt;<var>region</var>] [AT&gt;<var>lma_region</var>] [:<var>phdr</var> :<var>phdr</var> &hellip;] [=<var>fillexp</var>] [,]
  77. </pre></div>
  78. <p>Most output sections do not use most of the optional section attributes.
  79. </p>
  80. <p>The whitespace around <var>section</var> is required, so that the section
  81. name is unambiguous. The colon and the curly braces are also required.
  82. The comma at the end may be required if a <var>fillexp</var> is used and
  83. the next <var>sections-command</var> looks like a continuation of the expression.
  84. The line breaks and other white space are optional.
  85. </p>
  86. <p>Each <var>output-section-command</var> may be one of the following:
  87. </p>
  88. <ul>
  89. <li> a symbol assignment (see <a href="Assignments.html#Assignments">Assignments</a>)
  90. </li><li> an input section description (see <a href="Input-Section.html#Input-Section">Input Section</a>)
  91. </li><li> data values to include directly (see <a href="Output-Section-Data.html#Output-Section-Data">Output Section Data</a>)
  92. </li><li> a special output section keyword (see <a href="Output-Section-Keywords.html#Output-Section-Keywords">Output Section Keywords</a>)
  93. </li></ul>
  94. </body>
  95. </html>