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| <title>Using as: s390 Literal Pool Entries</title> |
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| <a name="s390-Literal-Pool-Entries"></a> |
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| Previous: <a href="s390-Instruction-Marker.html#s390-Instruction-Marker" accesskey="p" rel="prev">s390 Instruction Marker</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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| <a name="Literal-Pool-Entries"></a> |
| <h4 class="subsubsection">9.37.3.8 Literal Pool Entries</h4> |
| <a name="index-literal-pool-entries_002c-s390"></a> |
| <a name="index-s390-literal-pool-entries"></a> |
| |
| <p>A literal pool is a collection of values. To access the values a pointer |
| to the literal pool is loaded to a register, the literal pool register. |
| Usually, register %r13 is used as the literal pool register |
| (<a href="s390-Register.html#s390-Register">s390 Register</a>). Literal pool entries are created by adding the |
| suffix :lit1, :lit2, :lit4, or :lit8 to the end of an expression for an |
| instruction operand. The expression is added to the literal pool and the |
| operand is replaced with the offset to the literal in the literal pool. |
| </p> |
| <dl compact="compact"> |
| <dt><code>:lit1</code></dt> |
| <dd><p>The literal pool entry is created as an 8-bit value. An operand modifier |
| must not be used for the original expression. |
| </p></dd> |
| <dt><code>:lit2</code></dt> |
| <dd><p>The literal pool entry is created as a 16 bit value. The operand modifier |
| @got may be used in the original expression. The term ‘<samp>x@got:lit2</samp>’ |
| will put the got offset for the global symbol x to the literal pool as |
| 16 bit value. |
| </p></dd> |
| <dt><code>:lit4</code></dt> |
| <dd><p>The literal pool entry is created as a 32-bit value. The operand modifier |
| @got and @plt may be used in the original expression. The term |
| ‘<samp>x@got:lit4</samp>’ will put the got offset for the global symbol x to the |
| literal pool as a 32-bit value. The term ‘<samp>x@plt:lit4</samp>’ will put the |
| plt offset for the global symbol x to the literal pool as a 32-bit value. |
| </p></dd> |
| <dt><code>:lit8</code></dt> |
| <dd><p>The literal pool entry is created as a 64-bit value. The operand modifier |
| @got and @plt may be used in the original expression. The term |
| ‘<samp>x@got:lit8</samp>’ will put the got offset for the global symbol x to the |
| literal pool as a 64-bit value. The term ‘<samp>x@plt:lit8</samp>’ will put the |
| plt offset for the global symbol x to the literal pool as a 64-bit value. |
| </p></dd> |
| </dl> |
| |
| <p>The assembler directive ‘<samp>.ltorg</samp>’ is used to emit all literal pool |
| entries to the current position. |
| </p> |
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