88 lines
4.3 KiB
HTML
88 lines
4.3 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>RISC-V-ATTRIBUTE - Using as</title>
|
|
<meta http-equiv="Content-Type" content="text/html">
|
|
<meta name="description" content="Using as">
|
|
<meta name="generator" content="makeinfo 4.13">
|
|
<link title="Top" rel="start" href="index.html#Top">
|
|
<link rel="up" href="RISC_002dV_002dDependent.html#RISC_002dV_002dDependent" title="RISC-V-Dependent">
|
|
<link rel="prev" href="RISC_002dV_002dFormats.html#RISC_002dV_002dFormats" title="RISC-V-Formats">
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
<!--
|
|
This file documents the GNU Assembler "as".
|
|
|
|
Copyright (C) 1991-2019 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''.
|
|
|
|
-->
|
|
<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; }
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
<div class="node">
|
|
<a name="RISC-V-ATTRIBUTE"></a>
|
|
<a name="RISC_002dV_002dATTRIBUTE"></a>
|
|
<p>
|
|
Previous: <a rel="previous" accesskey="p" href="RISC_002dV_002dFormats.html#RISC_002dV_002dFormats">RISC-V-Formats</a>,
|
|
Up: <a rel="up" accesskey="u" href="RISC_002dV_002dDependent.html#RISC_002dV_002dDependent">RISC-V-Dependent</a>
|
|
<hr>
|
|
</div>
|
|
|
|
<h4 class="subsection">9.38.4 RISC-V Object Attribute</h4>
|
|
|
|
<p><a name="index-Object-Attribute_002c-RISC_002dV-2001"></a>
|
|
RISC-V attributes have a string value if the tag number is odd and an integer
|
|
value if the tag number is even.
|
|
|
|
<dl>
|
|
<dt><span class="roman">Tag_RISCV_stack_align (4)</span><dd>Tag_RISCV_strict_align records the N-byte stack alignment for this object. The
|
|
default value is 16 for RV32I or RV64I, and 4 for RV32E.
|
|
|
|
<p>The smallest value will be used if object files with different
|
|
Tag_RISCV_stack_align values are merged.
|
|
|
|
<br><dt><span class="roman">Tag_RISCV_arch (5)</span><dd>Tag_RISCV_arch contains a string for the target architecture taken from the
|
|
option <samp><span class="option">-march</span></samp>. Different architectures will be integrated into a
|
|
superset when object files are merged.
|
|
|
|
<p>Note that the version information of the target architecture must be presented
|
|
explicitly in the attribute and abbreviations must be expanded. The version
|
|
information, if not given by <samp><span class="option">-march</span></samp>, must be in accordance with the
|
|
default specified by the tool. For example, the architecture <code>RV32I</code> has
|
|
to be recorded in the attribute as <code>RV32I2P0</code> in which <code>2P0</code> stands
|
|
for the default version of its base ISA. On the other hand, the architecture
|
|
<code>RV32G</code> has to be presented as <code>RV32I2P0_M2P0_A2P0_F2P0_D2P0</code> in
|
|
which the abbreviation <code>G</code> is expanded to the <code>IMAFD</code> combination
|
|
with default versions of the standard extensions.
|
|
|
|
<br><dt><span class="roman">Tag_RISCV_unaligned_access (6)</span><dd>Tag_RISCV_unaligned_access is 0 for files that do not allow any unaligned
|
|
memory accesses, and 1 for files that do allow unaligned memory accesses.
|
|
|
|
<br><dt><span class="roman">Tag_RISCV_priv_spec (8)</span><br><dt><span class="roman">Tag_RISCV_priv_spec_minor (10)</span><br><dt><span class="roman">Tag_RISCV_priv_spec_revision (12)</span><dd>Tag_RISCV_priv_spec contains the major/minor/revision version information of
|
|
the privileged specification. It will report errors if object files of
|
|
different privileged specification versions are merged.
|
|
|
|
</dl>
|
|
|
|
<!-- Copyright (C) 2011-2019 Free Software Foundation, Inc. -->
|
|
<!-- This is part of the GAS manual. -->
|
|
<!-- For copying conditions, see the file as.texinfo. -->
|
|
</body></html>
|
|
|