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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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  3. <!-- This file documents the GNU Assembler "as".
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  15. <title>listing (Using as)</title>
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  24. <link href="Invoking.html#Invoking" rel="up" title="Invoking">
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  56. <a name="listing"></a>
  57. <div class="header">
  58. <p>
  59. Next: <a href="M.html#M" accesskey="n" rel="next">M</a>, Previous: <a href="L.html#L" accesskey="p" rel="prev">L</a>, Up: <a href="Invoking.html#Invoking" accesskey="u" rel="up">Invoking</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
  60. </div>
  61. <hr>
  62. <a name="Configuring-listing-output_003a-_002d_002dlisting"></a>
  63. <h3 class="section">2.8 Configuring listing output: <samp>--listing</samp></h3>
  64. <p>The listing feature of the assembler can be enabled via the command-line switch
  65. &lsquo;<samp>-a</samp>&rsquo; (see <a href="a.html#a">a</a>). This feature combines the input source file(s) with a
  66. hex dump of the corresponding locations in the output object file, and displays
  67. them as a listing file. The format of this listing can be controlled by
  68. directives inside the assembler source (i.e., <code>.list</code> (see <a href="List.html#List">List</a>),
  69. <code>.title</code> (see <a href="Title.html#Title">Title</a>), <code>.sbttl</code> (see <a href="Sbttl.html#Sbttl">Sbttl</a>),
  70. <code>.psize</code> (see <a href="Psize.html#Psize">Psize</a>), and
  71. <code>.eject</code> (see <a href="Eject.html#Eject">Eject</a>) and also by the following switches:
  72. </p>
  73. <dl compact="compact">
  74. <dt><code>--listing-lhs-width=&lsquo;<samp>number</samp>&rsquo;</code></dt>
  75. <dd><a name="index-_002d_002dlisting_002dlhs_002dwidth"></a>
  76. <a name="index-Width-of-first-line-disassembly-output"></a>
  77. <p>Sets the maximum width, in words, of the first line of the hex byte dump. This
  78. dump appears on the left hand side of the listing output.
  79. </p>
  80. </dd>
  81. <dt><code>--listing-lhs-width2=&lsquo;<samp>number</samp>&rsquo;</code></dt>
  82. <dd><a name="index-_002d_002dlisting_002dlhs_002dwidth2"></a>
  83. <a name="index-Width-of-continuation-lines-of-disassembly-output"></a>
  84. <p>Sets the maximum width, in words, of any further lines of the hex byte dump for
  85. a given input source line. If this value is not specified, it defaults to being
  86. the same as the value specified for &lsquo;<samp>--listing-lhs-width</samp>&rsquo;. If neither
  87. switch is used the default is to one.
  88. </p>
  89. </dd>
  90. <dt><code>--listing-rhs-width=&lsquo;<samp>number</samp>&rsquo;</code></dt>
  91. <dd><a name="index-_002d_002dlisting_002drhs_002dwidth"></a>
  92. <a name="index-Width-of-source-line-output"></a>
  93. <p>Sets the maximum width, in characters, of the source line that is displayed
  94. alongside the hex dump. The default value for this parameter is 100. The
  95. source line is displayed on the right hand side of the listing output.
  96. </p>
  97. </dd>
  98. <dt><code>--listing-cont-lines=&lsquo;<samp>number</samp>&rsquo;</code></dt>
  99. <dd><a name="index-_002d_002dlisting_002dcont_002dlines"></a>
  100. <a name="index-Maximum-number-of-continuation-lines"></a>
  101. <p>Sets the maximum number of continuation lines of hex dump that will be
  102. displayed for a given single line of source input. The default value is 4.
  103. </p></dd>
  104. </dl>
  105. </body>
  106. </html>