81 lines
3.5 KiB
HTML
81 lines
3.5 KiB
HTML
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<html lang="en">
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<head>
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<title>MIPS insn - 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="MIPS_002dDependent.html#MIPS_002dDependent" title="MIPS-Dependent">
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<link rel="prev" href="MIPS-autoextend.html#MIPS-autoextend" title="MIPS autoextend">
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<link rel="next" href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" title="MIPS FP ABIs">
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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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section entitled ``GNU Free Documentation License''.
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</head>
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<body>
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<div class="node">
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<a name="MIPS-insn"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="MIPS-FP-ABIs.html#MIPS-FP-ABIs">MIPS FP ABIs</a>,
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Previous: <a rel="previous" accesskey="p" href="MIPS-autoextend.html#MIPS-autoextend">MIPS autoextend</a>,
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Up: <a rel="up" accesskey="u" href="MIPS_002dDependent.html#MIPS_002dDependent">MIPS-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.27.8 Directive to mark data as an instruction</h4>
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<p><a name="index-g_t_0040code_007b_002einsn_007d-1591"></a>The <code>.insn</code> directive tells <code>as</code> that the following
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data is actually instructions. This makes a difference in MIPS 16 and
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microMIPS modes: when loading the address of a label which precedes
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instructions, <code>as</code> automatically adds 1 to the value, so
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that jumping to the loaded address will do the right thing.
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<p><a name="index-g_t_0040code_007b_002eglobal_007d-1592"></a>The <code>.global</code> and <code>.globl</code> directives supported by
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<code>as</code> will by default mark the symbol as pointing to a
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region of data not code. This means that, for example, any
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instructions following such a symbol will not be disassembled by
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<code>objdump</code> as it will regard them as data. To change this
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behavior an optional section name can be placed after the symbol name
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in the <code>.global</code> directive. If this section exists and is known
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to be a code section, then the symbol will be marked as pointing at
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code not data. Ie the syntax for the directive is:
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<p><code>.global </code><var>symbol</var><code>[ </code><var>section</var><code>][, </code><var>symbol</var><code>[ </code><var>section</var><code>]] ...</code>,
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<p>Here is a short example:
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<pre class="example"> .global foo .text, bar, baz .data
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foo:
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nop
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bar:
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.word 0x0
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baz:
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.word 0x1
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</pre>
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</body></html>
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