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<title>Using as: s390 Formats</title>
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<a name="s390-Formats"></a>
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<div class="header">
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<p>
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Next: <a href="s390-Aliases.html#s390-Aliases" accesskey="n" rel="next">s390 Aliases</a>, Previous: <a href="s390-Operands.html#s390-Operands" accesskey="p" rel="prev">s390 Operands</a>, Up: <a href="s390-Syntax.html#s390-Syntax" accesskey="u" rel="up">s390 Syntax</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>
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<hr>
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<a name="Instruction-Formats"></a>
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<h4 class="subsubsection">9.38.3.4 Instruction Formats</h4>
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<a name="index-instruction-formats_002c-s390"></a>
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<a name="index-s390-instruction-formats"></a>
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<p>The Principles of Operation manuals lists 26 instruction formats where
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some of the formats have multiple variants. For the ‘<samp>.insn</samp>’
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pseudo directive the assembler recognizes some of the formats.
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Typically, the most general variant of the instruction format is used
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by the ‘<samp>.insn</samp>’ directive.
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</p>
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<p>The following table lists the abbreviations used in the table of
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instruction formats:
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</p>
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<div class="display">
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<table>
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<tr><td><pre class="display">OpCode / OpCd</pre></td><td><pre class="display">Part of the op code.</pre></td></tr>
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<tr><td><pre class="display">Bx</pre></td><td><pre class="display">Base register number for operand x.</pre></td></tr>
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<tr><td><pre class="display">Dx</pre></td><td><pre class="display">Displacement for operand x.</pre></td></tr>
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<tr><td><pre class="display">DLx</pre></td><td><pre class="display">Displacement lower 12 bits for operand x.</pre></td></tr>
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<tr><td><pre class="display">DHx</pre></td><td><pre class="display">Displacement higher 8-bits for operand x.</pre></td></tr>
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<tr><td><pre class="display">Rx</pre></td><td><pre class="display">Register number for operand x.</pre></td></tr>
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<tr><td><pre class="display">Xx</pre></td><td><pre class="display">Index register number for operand x.</pre></td></tr>
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<tr><td><pre class="display">Ix</pre></td><td><pre class="display">Signed immediate for operand x.</pre></td></tr>
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<tr><td><pre class="display">Ux</pre></td><td><pre class="display">Unsigned immediate for operand x.</pre></td></tr>
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</table>
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</div>
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<p>An instruction is two, four, or six bytes in length and must be aligned
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on a 2 byte boundary. The first two bits of the instruction specify the
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length of the instruction, 00 indicates a two byte instruction, 01 and 10
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indicates a four byte instruction, and 11 indicates a six byte instruction.
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</p>
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<p>The following table lists the s390 instruction formats that are available
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with the ‘<samp>.insn</samp>’ pseudo directive:
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</p>
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<dl compact="compact">
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<dt><code>E format</code></dt>
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<dd><pre class="verbatim">+-------------+
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| OpCode |
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+-------------+
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0 15
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</pre>
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</dd>
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<dt><code>RI format: <insn> R1,I2</code></dt>
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<dd><pre class="verbatim">+--------+----+----+------------------+
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| OpCode | R1 |OpCd| I2 |
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+--------+----+----+------------------+
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0 8 12 16 31
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</pre>
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</dd>
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<dt><code>RIE format: <insn> R1,R3,I2</code></dt>
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<dd><pre class="verbatim">+--------+----+----+------------------+--------+--------+
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| OpCode | R1 | R3 | I2 |////////| OpCode |
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+--------+----+----+------------------+--------+--------+
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0 8 12 16 32 40 47
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</pre>
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</dd>
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<dt><code>RIL format: <insn> R1,I2</code></dt>
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<dd><pre class="verbatim">+--------+----+----+------------------------------------+
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| OpCode | R1 |OpCd| I2 |
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+--------+----+----+------------------------------------+
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0 8 12 16 47
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</pre>
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</dd>
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<dt><code>RILU format: <insn> R1,U2</code></dt>
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<dd><pre class="verbatim">+--------+----+----+------------------------------------+
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| OpCode | R1 |OpCd| U2 |
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+--------+----+----+------------------------------------+
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0 8 12 16 47
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</pre>
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</dd>
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<dt><code>RIS format: <insn> R1,I2,M3,D4(B4)</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+--------+--------+
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| OpCode | R1 | M3 | B4 | D4 | I2 | Opcode |
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+--------+----+----+----+-------------+--------+--------+
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0 8 12 16 20 32 36 47
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</pre>
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</dd>
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<dt><code>RR format: <insn> R1,R2</code></dt>
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<dd><pre class="verbatim">+--------+----+----+
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| OpCode | R1 | R2 |
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+--------+----+----+
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0 8 12 15
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</pre>
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</dd>
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<dt><code>RRE format: <insn> R1,R2</code></dt>
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<dd><pre class="verbatim">+------------------+--------+----+----+
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| OpCode |////////| R1 | R2 |
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+------------------+--------+----+----+
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0 16 24 28 31
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</pre>
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</dd>
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<dt><code>RRF format: <insn> R1,R2,R3,M4</code></dt>
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<dd><pre class="verbatim">+------------------+----+----+----+----+
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| OpCode | R3 | M4 | R1 | R2 |
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+------------------+----+----+----+----+
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0 16 20 24 28 31
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</pre>
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</dd>
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<dt><code>RRS format: <insn> R1,R2,M3,D4(B4)</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+----+----+--------+
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| OpCode | R1 | R3 | B4 | D4 | M3 |////| OpCode |
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+--------+----+----+----+-------------+----+----+--------+
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0 8 12 16 20 32 36 40 47
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</pre>
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</dd>
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<dt><code>RS format: <insn> R1,R3,D2(B2)</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+
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| OpCode | R1 | R3 | B2 | D2 |
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+--------+----+----+----+-------------+
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0 8 12 16 20 31
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</pre>
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</dd>
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<dt><code>RSE format: <insn> R1,R3,D2(B2)</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+--------+--------+
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| OpCode | R1 | R3 | B2 | D2 |////////| OpCode |
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+--------+----+----+----+-------------+--------+--------+
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0 8 12 16 20 32 40 47
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</pre>
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</dd>
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<dt><code>RSI format: <insn> R1,R3,I2</code></dt>
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<dd><pre class="verbatim">+--------+----+----+------------------------------------+
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| OpCode | R1 | R3 | I2 |
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+--------+----+----+------------------------------------+
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0 8 12 16 47
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</pre>
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</dd>
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<dt><code>RSY format: <insn> R1,R3,D2(B2)</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+--------+--------+
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| OpCode | R1 | R3 | B2 | DL2 | DH2 | OpCode |
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+--------+----+----+----+-------------+--------+--------+
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0 8 12 16 20 32 40 47
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</pre>
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</dd>
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<dt><code>RX format: <insn> R1,D2(X2,B2)</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+
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| OpCode | R1 | X2 | B2 | D2 |
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+--------+----+----+----+-------------+
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0 8 12 16 20 31
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</pre>
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</dd>
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<dt><code>RXE format: <insn> R1,D2(X2,B2)</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+--------+--------+
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| OpCode | R1 | X2 | B2 | D2 |////////| OpCode |
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+--------+----+----+----+-------------+--------+--------+
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0 8 12 16 20 32 40 47
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</pre>
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</dd>
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<dt><code>RXF format: <insn> R1,R3,D2(X2,B2)</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+----+---+--------+
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| OpCode | R3 | X2 | B2 | D2 | R1 |///| OpCode |
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+--------+----+----+----+-------------+----+---+--------+
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0 8 12 16 20 32 36 40 47
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</pre>
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</dd>
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<dt><code>RXY format: <insn> R1,D2(X2,B2)</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+--------+--------+
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| OpCode | R1 | X2 | B2 | DL2 | DH2 | OpCode |
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+--------+----+----+----+-------------+--------+--------+
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0 8 12 16 20 32 36 40 47
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</pre>
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</dd>
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<dt><code>S format: <insn> D2(B2)</code></dt>
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<dd><pre class="verbatim">+------------------+----+-------------+
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| OpCode | B2 | D2 |
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+------------------+----+-------------+
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0 16 20 31
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</pre>
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</dd>
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<dt><code>SI format: <insn> D1(B1),I2</code></dt>
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<dd><pre class="verbatim">+--------+---------+----+-------------+
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| OpCode | I2 | B1 | D1 |
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+--------+---------+----+-------------+
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0 8 16 20 31
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</pre>
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</dd>
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<dt><code>SIY format: <insn> D1(B1),U2</code></dt>
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<dd><pre class="verbatim">+--------+---------+----+-------------+--------+--------+
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| OpCode | I2 | B1 | DL1 | DH1 | OpCode |
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+--------+---------+----+-------------+--------+--------+
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0 8 16 20 32 36 40 47
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</pre>
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</dd>
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<dt><code>SIL format: <insn> D1(B1),I2</code></dt>
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<dd><pre class="verbatim">+------------------+----+-------------+-----------------+
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| OpCode | B1 | D1 | I2 |
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+------------------+----+-------------+-----------------+
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0 16 20 32 47
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</pre>
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</dd>
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<dt><code>SS format: <insn> D1(R1,B1),D2(B3),R3</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+----+------------+
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| OpCode | R1 | R3 | B1 | D1 | B2 | D2 |
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+--------+----+----+----+-------------+----+------------+
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0 8 12 16 20 32 36 47
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</pre>
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</dd>
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<dt><code>SSE format: <insn> D1(B1),D2(B2)</code></dt>
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<dd><pre class="verbatim">+------------------+----+-------------+----+------------+
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| OpCode | B1 | D1 | B2 | D2 |
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+------------------+----+-------------+----+------------+
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0 8 12 16 20 32 36 47
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</pre>
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</dd>
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<dt><code>SSF format: <insn> D1(B1),D2(B2),R3</code></dt>
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<dd><pre class="verbatim">+--------+----+----+----+-------------+----+------------+
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| OpCode | R3 |OpCd| B1 | D1 | B2 | D2 |
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+--------+----+----+----+-------------+----+------------+
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0 8 12 16 20 32 36 47
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</pre>
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</dd>
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</dl>
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<p>For the complete list of all instruction format variants see the
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Principles of Operation manuals.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="s390-Aliases.html#s390-Aliases" accesskey="n" rel="next">s390 Aliases</a>, Previous: <a href="s390-Operands.html#s390-Operands" accesskey="p" rel="prev">s390 Operands</a>, Up: <a href="s390-Syntax.html#s390-Syntax" accesskey="u" rel="up">s390 Syntax</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>
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