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<title>GNU Compiler Collection (GCC) Internals: Assembler Format</title>

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<a name="Assembler-Format"></a>
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Next: <a href="Debugging-Info.html#Debugging-Info" accesskey="n" rel="next">Debugging Info</a>, Previous: <a href="PIC.html#PIC" accesskey="p" rel="prev">PIC</a>, Up: <a href="Target-Macros.html#Target-Macros" accesskey="u" rel="up">Target Macros</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Defining-the-Output-Assembler-Language"></a>
<h3 class="section">17.20 Defining the Output Assembler Language</h3>

<p>This section describes macros whose principal purpose is to describe how
to write instructions in assembler language&mdash;rather than what the
instructions do.
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<tr><td align="left" valign="top">&bull; <a href="File-Framework.html#File-Framework" accesskey="1">File Framework</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Structural information for the assembler file.
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Data-Output.html#Data-Output" accesskey="2">Data Output</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Output of constants (numbers, strings, addresses).
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Uninitialized-Data.html#Uninitialized-Data" accesskey="3">Uninitialized Data</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Output of uninitialized variables.
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<tr><td align="left" valign="top">&bull; <a href="Label-Output.html#Label-Output" accesskey="4">Label Output</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Output and generation of labels.
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<tr><td align="left" valign="top">&bull; <a href="Initialization.html#Initialization" accesskey="5">Initialization</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">General principles of initialization
                         and termination routines.
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<tr><td align="left" valign="top">&bull; <a href="Macros-for-Initialization.html#Macros-for-Initialization" accesskey="6">Macros for Initialization</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
                         Specific macros that control the handling of
                         initialization and termination routines.
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<tr><td align="left" valign="top">&bull; <a href="Instruction-Output.html#Instruction-Output" accesskey="7">Instruction Output</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Output of actual instructions.
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<tr><td align="left" valign="top">&bull; <a href="Dispatch-Tables.html#Dispatch-Tables" accesskey="8">Dispatch Tables</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Output of jump tables.
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Exception-Region-Output.html#Exception-Region-Output" accesskey="9">Exception Region Output</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Output of exception region code.
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Alignment-Output.html#Alignment-Output">Alignment Output</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Pseudo ops for alignment and skipping data.
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