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