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193 lines
8.6 KiB
HTML
193 lines
8.6 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>VAX-Opts (Using as)</title>
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<meta name="description" content="VAX-Opts (Using as)">
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<meta name="keywords" content="VAX-Opts (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Vax_002dDependent.html#Vax_002dDependent" rel="up" title="Vax-Dependent">
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<link href="VAX_002dfloat.html#VAX_002dfloat" rel="next" title="VAX-float">
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<link href="Vax_002dDependent.html#Vax_002dDependent" rel="prev" title="Vax-Dependent">
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<style type="text/css">
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</style>
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</head>
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<body lang="en">
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<a name="VAX_002dOpts"></a>
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<div class="header">
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<p>
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Next: <a href="VAX_002dfloat.html#VAX_002dfloat" accesskey="n" rel="next">VAX-float</a>, Up: <a href="Vax_002dDependent.html#Vax_002dDependent" accesskey="u" rel="up">Vax-Dependent</a> [<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>
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</div>
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<hr>
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<a name="VAX-Command_002dLine-Options"></a>
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<h4 class="subsection">9.49.1 VAX Command-Line Options</h4>
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<a name="index-command_002dline-options-ignored_002c-VAX"></a>
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<a name="index-VAX-command_002dline-options-ignored"></a>
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<p>The Vax version of <code>as</code> accepts any of the following options,
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gives a warning message that the option was ignored and proceeds.
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These options are for compatibility with scripts designed for other
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people’s assemblers.
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</p>
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<dl compact="compact">
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<dd><a name="index-_002dD_002c-ignored-on-VAX"></a>
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<a name="index-_002dS_002c-ignored-on-VAX"></a>
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<a name="index-_002dT_002c-ignored-on-VAX"></a>
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</dd>
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<dt><code><code>-D</code> (Debug)</code></dt>
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<dt><code><code>-S</code> (Symbol Table)</code></dt>
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<dt><code><code>-T</code> (Token Trace)</code></dt>
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<dd><p>These are obsolete options used to debug old assemblers.
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</p>
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<a name="index-_002dd_002c-VAX-option"></a>
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</dd>
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<dt><code><code>-d</code> (Displacement size for JUMPs)</code></dt>
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<dd><p>This option expects a number following the ‘<samp>-d</samp>’. Like options
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that expect filenames, the number may immediately follow the
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‘<samp>-d</samp>’ (old standard) or constitute the whole of the command-line
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argument that follows ‘<samp>-d</samp>’ (<small>GNU</small> standard).
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</p>
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<a name="index-_002dV_002c-redundant-on-VAX"></a>
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</dd>
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<dt><code><code>-V</code> (Virtualize Interpass Temporary File)</code></dt>
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<dd><p>Some other assemblers use a temporary file. This option
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commanded them to keep the information in active memory rather
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than in a disk file. <code>as</code> always does this, so this
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option is redundant.
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</p>
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<a name="index-_002dJ_002c-ignored-on-VAX"></a>
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</dd>
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<dt><code><code>-J</code> (JUMPify Longer Branches)</code></dt>
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<dd><p>Many 32-bit computers permit a variety of branch instructions
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to do the same job. Some of these instructions are short (and
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fast) but have a limited range; others are long (and slow) but
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can branch anywhere in virtual memory. Often there are 3
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flavors of branch: short, medium and long. Some other
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assemblers would emit short and medium branches, unless told by
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this option to emit short and long branches.
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</p>
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<a name="index-_002dt_002c-ignored-on-VAX"></a>
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</dd>
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<dt><code><code>-t</code> (Temporary File Directory)</code></dt>
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<dd><p>Some other assemblers may use a temporary file, and this option
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takes a filename being the directory to site the temporary
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file. Since <code>as</code> does not use a temporary disk file, this
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option makes no difference. ‘<samp>-t</samp>’ needs exactly one
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filename.
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</p></dd>
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</dl>
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<a name="index-VMS-_0028VAX_0029-options"></a>
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<a name="index-options-for-VAX_002fVMS"></a>
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<a name="index-VAX_002fVMS-options"></a>
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<a name="index-Vax_002d11-C-compatibility"></a>
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<a name="index-symbols-with-uppercase_002c-VAX_002fVMS"></a>
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<p>The Vax version of the assembler accepts additional options when
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compiled for VMS:
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</p>
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<dl compact="compact">
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<dd><a name="index-_002dh-option_002c-VAX_002fVMS"></a>
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</dd>
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<dt>‘<samp>-h <var>n</var></samp>’</dt>
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<dd><p>External symbol or section (used for global variables) names are not
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case sensitive on VAX/VMS and always mapped to upper case. This is
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contrary to the C language definition which explicitly distinguishes
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upper and lower case. To implement a standard conforming C compiler,
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names must be changed (mapped) to preserve the case information. The
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default mapping is to convert all lower case characters to uppercase and
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adding an underscore followed by a 6 digit hex value, representing a 24
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digit binary value. The one digits in the binary value represent which
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characters are uppercase in the original symbol name.
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</p>
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<p>The ‘<samp>-h <var>n</var></samp>’ option determines how we map names. This takes
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several values. No ‘<samp>-h</samp>’ switch at all allows case hacking as
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described above. A value of zero (‘<samp>-h0</samp>’) implies names should be
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upper case, and inhibits the case hack. A value of 2 (‘<samp>-h2</samp>’)
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implies names should be all lower case, with no case hack. A value of 3
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(‘<samp>-h3</samp>’) implies that case should be preserved. The value 1 is
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unused. The <code>-H</code> option directs <code>as</code> to display
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every mapped symbol during assembly.
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</p>
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<p>Symbols whose names include a dollar sign ‘<samp>$</samp>’ are exceptions to the
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general name mapping. These symbols are normally only used to reference
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VMS library names. Such symbols are always mapped to upper case.
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</p>
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<a name="index-_002d_002b-option_002c-VAX_002fVMS"></a>
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</dd>
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<dt>‘<samp>-+</samp>’</dt>
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<dd><p>The ‘<samp>-+</samp>’ option causes <code>as</code> to truncate any symbol
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name larger than 31 characters. The ‘<samp>-+</samp>’ option also prevents some
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code following the ‘<samp>_main</samp>’ symbol normally added to make the object
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file compatible with Vax-11 "C".
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</p>
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<a name="index-_002d1-option_002c-VAX_002fVMS"></a>
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</dd>
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<dt>‘<samp>-1</samp>’</dt>
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<dd><p>This option is ignored for backward compatibility with <code>as</code>
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version 1.x.
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</p>
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<a name="index-_002dH-option_002c-VAX_002fVMS"></a>
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</dd>
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<dt>‘<samp>-H</samp>’</dt>
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<dd><p>The ‘<samp>-H</samp>’ option causes <code>as</code> to print every symbol
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which was changed by case mapping.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="VAX_002dfloat.html#VAX_002dfloat" accesskey="n" rel="next">VAX-float</a>, Up: <a href="Vax_002dDependent.html#Vax_002dDependent" accesskey="u" rel="up">Vax-Dependent</a> [<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>
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</div>
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</body>
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</html>
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