| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- This file documents the GNU Assembler "as". |
| |
| Copyright (C) 1991-2013 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 1.3 |
| 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". |
| --> |
| <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>Using as: CRIS-Opts</title> |
| |
| <meta name="description" content="Using as: CRIS-Opts"> |
| <meta name="keywords" content="Using as: CRIS-Opts"> |
| <meta name="resource-type" content="document"> |
| <meta name="distribution" content="global"> |
| <meta name="Generator" content="makeinfo"> |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
| <link href="index.html#Top" rel="start" title="Top"> |
| <link href="AS-Index.html#AS-Index" rel="index" title="AS Index"> |
| <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> |
| <link href="CRIS_002dDependent.html#CRIS_002dDependent" rel="up" title="CRIS-Dependent"> |
| <link href="CRIS_002dExpand.html#CRIS_002dExpand" rel="next" title="CRIS-Expand"> |
| <link href="CRIS_002dDependent.html#CRIS_002dDependent" rel="prev" title="CRIS-Dependent"> |
| <style type="text/css"> |
| <!-- |
| a.summary-letter {text-decoration: none} |
| blockquote.smallquotation {font-size: smaller} |
| div.display {margin-left: 3.2em} |
| div.example {margin-left: 3.2em} |
| div.indentedblock {margin-left: 3.2em} |
| div.lisp {margin-left: 3.2em} |
| div.smalldisplay {margin-left: 3.2em} |
| div.smallexample {margin-left: 3.2em} |
| div.smallindentedblock {margin-left: 3.2em; font-size: smaller} |
| div.smalllisp {margin-left: 3.2em} |
| kbd {font-style:oblique} |
| pre.display {font-family: inherit} |
| pre.format {font-family: inherit} |
| pre.menu-comment {font-family: serif} |
| pre.menu-preformatted {font-family: serif} |
| pre.smalldisplay {font-family: inherit; font-size: smaller} |
| pre.smallexample {font-size: smaller} |
| pre.smallformat {font-family: inherit; font-size: smaller} |
| pre.smalllisp {font-size: smaller} |
| span.nocodebreak {white-space:nowrap} |
| span.nolinebreak {white-space:nowrap} |
| span.roman {font-family:serif; font-weight:normal} |
| span.sansserif {font-family:sans-serif; font-weight:normal} |
| ul.no-bullet {list-style: none} |
| --> |
| </style> |
| |
| |
| </head> |
| |
| <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> |
| <a name="CRIS_002dOpts"></a> |
| <div class="header"> |
| <p> |
| Next: <a href="CRIS_002dExpand.html#CRIS_002dExpand" accesskey="n" rel="next">CRIS-Expand</a>, Up: <a href="CRIS_002dDependent.html#CRIS_002dDependent" accesskey="u" rel="up">CRIS-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> |
| </div> |
| <hr> |
| <a name="Command_002dline-Options"></a> |
| <h4 class="subsection">9.8.1 Command-line Options</h4> |
| |
| <a name="index-options_002c-CRIS"></a> |
| <a name="index-CRIS-options"></a> |
| <p>The CRIS version of <code>as</code> has these |
| machine-dependent command-line options. |
| </p> |
| <a name="index-_002d_002demulation_003dcriself-command-line-option_002c-CRIS"></a> |
| <a name="index-_002d_002demulation_003dcrisaout-command-line-option_002c-CRIS"></a> |
| <a name="index-CRIS-_002d_002demulation_003dcriself-command-line-option"></a> |
| <a name="index-CRIS-_002d_002demulation_003dcrisaout-command-line-option"></a> |
| |
| <p>The format of the generated object files can be either ELF or |
| a.out, specified by the command-line options |
| <samp>--emulation=crisaout</samp> and <samp>--emulation=criself</samp>. |
| The default is ELF (criself), unless <code>as</code> has been |
| configured specifically for a.out by using the configuration |
| name <code>cris-axis-aout</code>. |
| </p> |
| <a name="index-_002d_002dunderscore-command-line-option_002c-CRIS"></a> |
| <a name="index-_002d_002dno_002dunderscore-command-line-option_002c-CRIS"></a> |
| <a name="index-CRIS-_002d_002dunderscore-command-line-option"></a> |
| <a name="index-CRIS-_002d_002dno_002dunderscore-command-line-option"></a> |
| <p>There are two different link-incompatible ELF object file |
| variants for CRIS, for use in environments where symbols are |
| expected to be prefixed by a leading ‘<samp>_</samp>’ character and for |
| environments without such a symbol prefix. The variant used for |
| GNU/Linux port has no symbol prefix. Which variant to produce |
| is specified by either of the options <samp>--underscore</samp> and |
| <samp>--no-underscore</samp>. The default is <samp>--underscore</samp>. |
| Since symbols in CRIS a.out objects are expected to have a |
| ‘<samp>_</samp>’ prefix, specifying <samp>--no-underscore</samp> when |
| generating a.out objects is an error. Besides the object format |
| difference, the effect of this option is to parse register names |
| differently (see <a href="CRIS_002dPseudos.html#crisnous">crisnous</a>). The <samp>--no-underscore</samp> |
| option makes a ‘<samp>$</samp>’ register prefix mandatory. |
| </p> |
| <a name="index-_002d_002dpic-command-line-option_002c-CRIS"></a> |
| <a name="index-CRIS-_002d_002dpic-command-line-option"></a> |
| <a name="index-Position_002dindependent-code_002c-CRIS"></a> |
| <a name="index-CRIS-position_002dindependent-code"></a> |
| <p>The option <samp>--pic</samp> must be passed to <code>as</code> in |
| order to recognize the symbol syntax used for ELF (SVR4 PIC) |
| position-independent-code (see <a href="CRIS_002dPic.html#crispic">crispic</a>). This will also |
| affect expansion of instructions. The expansion with |
| <samp>--pic</samp> will use PC-relative rather than (slightly |
| faster) absolute addresses in those expansions. This option is only |
| valid when generating ELF format object files. |
| </p> |
| <a name="index-_002d_002dmarch_003darchitecture-command-line-option_002c-CRIS"></a> |
| <a name="index-CRIS-_002d_002dmarch_003darchitecture-command-line-option"></a> |
| <a name="index-Architecture-variant-option_002c-CRIS"></a> |
| <a name="index-CRIS-architecture-variant-option"></a> |
| <p>The option <samp>--march=<var>architecture</var></samp> |
| <a name="march_002doption"></a>specifies the recognized instruction set |
| and recognized register names. It also controls the |
| architecture type of the object file. Valid values for |
| <var>architecture</var> are: |
| </p><dl compact="compact"> |
| <dt><code>v0_v10</code></dt> |
| <dd><p>All instructions and register names for any architecture variant |
| in the set v0…v10 are recognized. This is the |
| default if the target is configured as cris-*. |
| </p> |
| </dd> |
| <dt><code>v10</code></dt> |
| <dd><p>Only instructions and register names for CRIS v10 (as found in |
| ETRAX 100 LX) are recognized. This is the default if the target |
| is configured as crisv10-*. |
| </p> |
| </dd> |
| <dt><code>v32</code></dt> |
| <dd><p>Only instructions and register names for CRIS v32 (code name |
| Guinness) are recognized. This is the default if the target is |
| configured as crisv32-*. This value implies |
| <samp>--no-mul-bug-abort</samp>. (A subsequent |
| <samp>--mul-bug-abort</samp> will turn it back on.) |
| </p> |
| </dd> |
| <dt><code>common_v10_v32</code></dt> |
| <dd><p>Only instructions with register names and addressing modes with |
| opcodes common to the v10 and v32 are recognized. |
| </p></dd> |
| </dl> |
| |
| <a name="index-_002dN-command-line-option_002c-CRIS"></a> |
| <a name="index-CRIS-_002dN-command-line-option"></a> |
| <p>When <samp>-N</samp> is specified, <code>as</code> will emit a |
| warning when a 16-bit branch instruction is expanded into a |
| 32-bit multiple-instruction construct (see <a href="CRIS_002dExpand.html#CRIS_002dExpand">CRIS-Expand</a>). |
| </p> |
| <a name="index-_002d_002dno_002dmul_002dbug_002dabort-command-line-option_002c-CRIS"></a> |
| <a name="index-_002d_002dmul_002dbug_002dabort-command-line-option_002c-CRIS"></a> |
| <a name="index-CRIS-_002d_002dno_002dmul_002dbug_002dabort-command-line-option"></a> |
| <a name="index-CRIS-_002d_002dmul_002dbug_002dabort-command-line-option"></a> |
| |
| <p>Some versions of the CRIS v10, for example in the Etrax 100 LX, |
| contain a bug that causes destabilizing memory accesses when a |
| multiply instruction is executed with certain values in the |
| first operand just before a cache-miss. When the |
| <samp>--mul-bug-abort</samp> command line option is active (the |
| default value), <code>as</code> will refuse to assemble a file |
| containing a multiply instruction at a dangerous offset, one |
| that could be the last on a cache-line, or is in a section with |
| insufficient alignment. This placement checking does not catch |
| any case where the multiply instruction is dangerously placed |
| because it is located in a delay-slot. The |
| <samp>--mul-bug-abort</samp> command line option turns off the |
| checking. |
| </p> |
| <hr> |
| <div class="header"> |
| <p> |
| Next: <a href="CRIS_002dExpand.html#CRIS_002dExpand" accesskey="n" rel="next">CRIS-Expand</a>, Up: <a href="CRIS_002dDependent.html#CRIS_002dDependent" accesskey="u" rel="up">CRIS-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> |
| </div> |
| |
| |
| |
| </body> |
| </html> |
