124 lines
7.1 KiB
HTML
124 lines
7.1 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>VAX-Opts - Using as</title>
|
|
<meta http-equiv="Content-Type" content="text/html">
|
|
<meta name="description" content="Using as">
|
|
<meta name="generator" content="makeinfo 4.7">
|
|
<link title="Top" rel="start" href="index.html#Top">
|
|
<link rel="up" href="Vax_002dDependent.html#Vax_002dDependent" title="Vax-Dependent">
|
|
<link rel="next" href="VAX_002dfloat.html#VAX_002dfloat" title="VAX-float">
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
<!--
|
|
This file documents the GNU Assembler "as".
|
|
|
|
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
|
|
2006, 2007 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.1
|
|
or any later version published by the Free Software Foundation;
|
|
with no Invariant Sections, with no Front-Cover Texts, and with no
|
|
Back-Cover Texts. A copy of the license is included in the
|
|
section entitled ``GNU Free Documentation License''.
|
|
|
|
man end-->
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
|
<style type="text/css"><!--
|
|
pre.display { font-family:inherit }
|
|
pre.format { font-family:inherit }
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
|
pre.smallexample { font-size:smaller }
|
|
pre.smalllisp { font-size:smaller }
|
|
span.sc { font-variant:small-caps }
|
|
span.roman { font-family: serif; font-weight: normal; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
<div class="node">
|
|
<p>
|
|
<a name="VAX_002dOpts"></a>Next: <a rel="next" accesskey="n" href="VAX_002dfloat.html#VAX_002dfloat">VAX-float</a>,
|
|
Up: <a rel="up" accesskey="u" href="Vax_002dDependent.html#Vax_002dDependent">Vax-Dependent</a>
|
|
<hr><br>
|
|
</div>
|
|
|
|
<h4 class="subsection">9.34.1 VAX Command-Line Options</h4>
|
|
|
|
<p><a name="index-command_002dline-options-ignored_002c-VAX-1735"></a><a name="index-VAX-command_002dline-options-ignored-1736"></a>The Vax version of <code>as</code> accepts any of the following options,
|
|
gives a warning message that the option was ignored and proceeds.
|
|
These options are for compatibility with scripts designed for other
|
|
people's assemblers.
|
|
|
|
|
|
<a name="index-_0040code_007b_002dD_007d_002c-ignored-on-VAX-1737"></a>
|
|
<a name="index-_0040code_007b_002dS_007d_002c-ignored-on-VAX-1738"></a>
|
|
<a name="index-_0040code_007b_002dT_007d_002c-ignored-on-VAX-1739"></a>
|
|
<dl><dt><code>-D (Debug)</code><dt><code>-S (Symbol Table)</code><dt><code>-T (Token Trace)</code><dd>These are obsolete options used to debug old assemblers.
|
|
|
|
<p><a name="index-_0040code_007b_002dd_007d_002c-VAX-option-1740"></a><br><dt><code>-d (Displacement size for JUMPs)</code><dd>This option expects a number following the <span class="samp">-d</span>. Like options
|
|
that expect filenames, the number may immediately follow the
|
|
<span class="samp">-d</span> (old standard) or constitute the whole of the command line
|
|
argument that follows <span class="samp">-d</span> (<span class="sc">gnu</span> standard).
|
|
|
|
<p><a name="index-_0040code_007b_002dV_007d_002c-redundant-on-VAX-1741"></a><br><dt><code>-V (Virtualize Interpass Temporary File)</code><dd>Some other assemblers use a temporary file. This option
|
|
commanded them to keep the information in active memory rather
|
|
than in a disk file. <code>as</code> always does this, so this
|
|
option is redundant.
|
|
|
|
<p><a name="index-_0040code_007b_002dJ_007d_002c-ignored-on-VAX-1742"></a><br><dt><code>-J (JUMPify Longer Branches)</code><dd>Many 32-bit computers permit a variety of branch instructions
|
|
to do the same job. Some of these instructions are short (and
|
|
fast) but have a limited range; others are long (and slow) but
|
|
can branch anywhere in virtual memory. Often there are 3
|
|
flavors of branch: short, medium and long. Some other
|
|
assemblers would emit short and medium branches, unless told by
|
|
this option to emit short and long branches.
|
|
|
|
<p><a name="index-_0040code_007b_002dt_007d_002c-ignored-on-VAX-1743"></a><br><dt><code>-t (Temporary File Directory)</code><dd>Some other assemblers may use a temporary file, and this option
|
|
takes a filename being the directory to site the temporary
|
|
file. Since <code>as</code> does not use a temporary disk file, this
|
|
option makes no difference. <span class="samp">-t</span> needs exactly one
|
|
filename.
|
|
</dl>
|
|
|
|
<p><a name="index-VMS-_0028VAX_0029-options-1744"></a><a name="index-options-for-VAX_002fVMS-1745"></a><a name="index-VAX_002fVMS-options-1746"></a><a name="index-Vax_002d11-C-compatibility-1747"></a><a name="index-symbols-with-uppercase_002c-VAX_002fVMS-1748"></a>The Vax version of the assembler accepts additional options when
|
|
compiled for VMS:
|
|
|
|
|
|
<a name="index-_0040samp_007b_002dh_007d-option_002c-VAX_002fVMS-1749"></a>
|
|
<dl><dt><span class="samp">-h </span><var>n</var><dd>External symbol or section (used for global variables) names are not
|
|
case sensitive on VAX/VMS and always mapped to upper case. This is
|
|
contrary to the C language definition which explicitly distinguishes
|
|
upper and lower case. To implement a standard conforming C compiler,
|
|
names must be changed (mapped) to preserve the case information. The
|
|
default mapping is to convert all lower case characters to uppercase and
|
|
adding an underscore followed by a 6 digit hex value, representing a 24
|
|
digit binary value. The one digits in the binary value represent which
|
|
characters are uppercase in the original symbol name.
|
|
|
|
<p>The <span class="samp">-h </span><var>n</var> option determines how we map names. This takes
|
|
several values. No <span class="samp">-h</span> switch at all allows case hacking as
|
|
described above. A value of zero (<span class="samp">-h0</span>) implies names should be
|
|
upper case, and inhibits the case hack. A value of 2 (<span class="samp">-h2</span>)
|
|
implies names should be all lower case, with no case hack. A value of 3
|
|
(<span class="samp">-h3</span>) implies that case should be preserved. The value 1 is
|
|
unused. The <code>-H</code> option directs <code>as</code> to display
|
|
every mapped symbol during assembly.
|
|
|
|
<p>Symbols whose names include a dollar sign <span class="samp">$</span> are exceptions to the
|
|
general name mapping. These symbols are normally only used to reference
|
|
VMS library names. Such symbols are always mapped to upper case.
|
|
|
|
<p><a name="index-_0040samp_007b_002d_002b_007d-option_002c-VAX_002fVMS-1750"></a><br><dt><span class="samp">-+</span><dd>The <span class="samp">-+</span> option causes <code>as</code> to truncate any symbol
|
|
name larger than 31 characters. The <span class="samp">-+</span> option also prevents some
|
|
code following the <span class="samp">_main</span> symbol normally added to make the object
|
|
file compatible with Vax-11 "C".
|
|
|
|
<p><a name="index-_0040samp_007b_002d1_007d-option_002c-VAX_002fVMS-1751"></a><br><dt><span class="samp">-1</span><dd>This option is ignored for backward compatibility with <code>as</code>
|
|
version 1.x.
|
|
|
|
<p><a name="index-_0040samp_007b_002dH_007d-option_002c-VAX_002fVMS-1752"></a><br><dt><span class="samp">-H</span><dd>The <span class="samp">-H</span> option causes <code>as</code> to print every symbol
|
|
which was changed by case mapping.
|
|
</dl>
|
|
|
|
</body></html>
|
|
|