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256 lines
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HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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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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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>TILEPro Modifiers (Using as)</title>
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<meta name="description" content="TILEPro Modifiers (Using as)">
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<meta name="keywords" content="TILEPro Modifiers (Using as)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="TILEPro-Syntax.html#TILEPro-Syntax" rel="up" title="TILEPro Syntax">
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<link href="TILEPro-Directives.html#TILEPro-Directives" rel="next" title="TILEPro Directives">
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<link href="TILEPro-Registers.html#TILEPro-Registers" rel="prev" title="TILEPro Registers">
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</head>
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<body lang="en">
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<a name="TILEPro-Modifiers"></a>
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<div class="header">
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<p>
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Previous: <a href="TILEPro-Registers.html#TILEPro-Registers" accesskey="p" rel="prev">TILEPro Registers</a>, Up: <a href="TILEPro-Syntax.html#TILEPro-Syntax" accesskey="u" rel="up">TILEPro 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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</div>
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<hr>
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<a name="Symbolic-Operand-Modifiers-5"></a>
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<h4 class="subsubsection">9.47.2.3 Symbolic Operand Modifiers</h4>
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<a name="index-TILEPro-modifiers"></a>
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<a name="index-symbol-modifiers_002c-TILEPro"></a>
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<p>The assembler supports several modifiers when using symbol addresses
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in TILEPro instruction operands. The general syntax is the following:
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</p>
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<div class="smallexample">
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<pre class="smallexample">modifier(symbol)
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</pre></div>
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<p>The following modifiers are supported:
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</p>
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<dl compact="compact">
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<dt><code>lo16</code></dt>
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<dd>
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<p>This modifier is used to load the low 16 bits of the symbol’s address,
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sign-extended to a 32-bit value (sign-extension allows it to be
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range-checked against signed 16 bit immediate operands without
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complaint).
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</p>
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</dd>
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<dt><code>hi16</code></dt>
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<dd>
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<p>This modifier is used to load the high 16 bits of the symbol’s
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address, also sign-extended to a 32-bit value.
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</p>
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</dd>
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<dt><code>ha16</code></dt>
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<dd>
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<p><code>ha16(N)</code> is identical to <code>hi16(N)</code>, except if
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<code>lo16(N)</code> is negative it adds one to the <code>hi16(N)</code>
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value. This way <code>lo16</code> and <code>ha16</code> can be added to create any
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32-bit value using <code>auli</code>. For example, here is how you move an
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arbitrary 32-bit address into r3:
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</p>
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<div class="smallexample">
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<pre class="smallexample">moveli r3, lo16(sym)
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auli r3, r3, ha16(sym)
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</pre></div>
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</dd>
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<dt><code>got</code></dt>
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<dd>
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<p>This modifier is used to load the offset of the GOT entry
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corresponding to the symbol.
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</p>
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</dd>
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<dt><code>got_lo16</code></dt>
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<dd>
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<p>This modifier is used to load the sign-extended low 16 bits of the
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offset of the GOT entry corresponding to the symbol.
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</p>
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</dd>
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<dt><code>got_hi16</code></dt>
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<dd>
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<p>This modifier is used to load the sign-extended high 16 bits of the
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offset of the GOT entry corresponding to the symbol.
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</p>
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</dd>
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<dt><code>got_ha16</code></dt>
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<dd>
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<p>This modifier is like <code>got_hi16</code>, but it adds one if
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<code>got_lo16</code> of the input value is negative.
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</p>
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</dd>
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<dt><code>plt</code></dt>
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<dd>
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<p>This modifier is used for function symbols. It causes a
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<em>procedure linkage table</em>, an array of code stubs, to be created
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at the time the shared object is created or linked against, together
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with a global offset table entry. The value is a pc-relative offset
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to the corresponding stub code in the procedure linkage table. This
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arrangement causes the run-time symbol resolver to be called to look
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up and set the value of the symbol the first time the function is
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called (at latest; depending environment variables). It is only safe
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to leave the symbol unresolved this way if all references are function
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calls.
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</p>
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</dd>
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<dt><code>tls_gd</code></dt>
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<dd>
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<p>This modifier is used to load the offset of the GOT entry of the
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symbol’s TLS descriptor, to be used for general-dynamic TLS accesses.
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</p>
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</dd>
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<dt><code>tls_gd_lo16</code></dt>
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<dd>
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<p>This modifier is used to load the sign-extended low 16 bits of the
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offset of the GOT entry of the symbol’s TLS descriptor, to be used for
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general dynamic TLS accesses.
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</p>
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</dd>
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<dt><code>tls_gd_hi16</code></dt>
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<dd>
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<p>This modifier is used to load the sign-extended high 16 bits of the
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offset of the GOT entry of the symbol’s TLS descriptor, to be used for
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general dynamic TLS accesses.
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</p>
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</dd>
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<dt><code>tls_gd_ha16</code></dt>
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<dd>
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<p>This modifier is like <code>tls_gd_hi16</code>, but it adds one to the value
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if <code>tls_gd_lo16</code> of the input value is negative.
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</p>
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</dd>
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<dt><code>tls_ie</code></dt>
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<dd>
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<p>This modifier is used to load the offset of the GOT entry containing
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the offset of the symbol’s address from the TCB, to be used for
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initial-exec TLS accesses.
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</p>
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</dd>
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<dt><code>tls_ie_lo16</code></dt>
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<dd>
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<p>This modifier is used to load the low 16 bits of the offset of the GOT
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entry containing the offset of the symbol’s address from the TCB, to
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be used for initial-exec TLS accesses.
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</p>
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</dd>
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<dt><code>tls_ie_hi16</code></dt>
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<dd>
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<p>This modifier is used to load the high 16 bits of the offset of the
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GOT entry containing the offset of the symbol’s address from the TCB,
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to be used for initial-exec TLS accesses.
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</p>
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</dd>
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<dt><code>tls_ie_ha16</code></dt>
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<dd>
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<p>This modifier is like <code>tls_ie_hi16</code>, but it adds one to the value
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if <code>tls_ie_lo16</code> of the input value is negative.
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</p>
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</dd>
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<dt><code>tls_le</code></dt>
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<dd>
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<p>This modifier is used to load the offset of the symbol’s address from
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the TCB, to be used for local-exec TLS accesses.
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</p>
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</dd>
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<dt><code>tls_le_lo16</code></dt>
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<dd>
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<p>This modifier is used to load the low 16 bits of the offset of the
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symbol’s address from the TCB, to be used for local-exec TLS accesses.
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</p>
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</dd>
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<dt><code>tls_le_hi16</code></dt>
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<dd>
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<p>This modifier is used to load the high 16 bits of the offset of the
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symbol’s address from the TCB, to be used for local-exec TLS accesses.
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</p>
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</dd>
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<dt><code>tls_le_ha16</code></dt>
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<dd>
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<p>This modifier is like <code>tls_le_hi16</code>, but it adds one to the value
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if <code>tls_le_lo16</code> of the input value is negative.
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</p>
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</dd>
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<dt><code>tls_gd_call</code></dt>
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<dd>
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<p>This modifier is used to tag an instruction as the “call” part of a
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calling sequence for a TLS GD reference of its operand.
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</p>
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</dd>
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<dt><code>tls_gd_add</code></dt>
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<dd>
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<p>This modifier is used to tag an instruction as the “add” part of a
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calling sequence for a TLS GD reference of its operand.
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</p>
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</dd>
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<dt><code>tls_ie_load</code></dt>
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<dd>
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<p>This modifier is used to tag an instruction as the “load” part of a
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calling sequence for a TLS IE reference of its operand.
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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Previous: <a href="TILEPro-Registers.html#TILEPro-Registers" accesskey="p" rel="prev">TILEPro Registers</a>, Up: <a href="TILEPro-Syntax.html#TILEPro-Syntax" accesskey="u" rel="up">TILEPro 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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</div>
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</body>
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</html>
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