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174 lines
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4 years ago
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<title>TILEPro Modifiers - Using as</title>
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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<div class="node">
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<a name="TILEPro-Modifiers"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="TILEPro-Registers.html#TILEPro-Registers">TILEPro Registers</a>,
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Up: <a rel="up" accesskey="u" href="TILEPro-Syntax.html#TILEPro-Syntax">TILEPro Syntax</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.46.2.3 Symbolic Operand Modifiers</h5>
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<p><a name="index-TILEPro-modifiers-2247"></a><a name="index-symbol-modifiers_002c-TILEPro-2248"></a>
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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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<pre class="smallexample"> modifier(symbol)
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</pre>
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<p>The following modifiers are supported:
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<dl>
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<dt><code>lo16</code><dd>
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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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<br><dt><code>hi16</code><dd>
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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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<br><dt><code>ha16</code><dd>
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<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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<pre class="smallexample"> moveli r3, lo16(sym)
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auli r3, r3, ha16(sym)
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</pre>
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<br><dt><code>got</code><dd>
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This modifier is used to load the offset of the GOT entry
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corresponding to the symbol.
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<br><dt><code>got_lo16</code><dd>
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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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<br><dt><code>got_hi16</code><dd>
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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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<br><dt><code>got_ha16</code><dd>
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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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<br><dt><code>plt</code><dd>
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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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<br><dt><code>tls_gd</code><dd>
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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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<br><dt><code>tls_gd_lo16</code><dd>
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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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<br><dt><code>tls_gd_hi16</code><dd>
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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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<br><dt><code>tls_gd_ha16</code><dd>
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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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<br><dt><code>tls_ie</code><dd>
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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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<br><dt><code>tls_ie_lo16</code><dd>
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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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<br><dt><code>tls_ie_hi16</code><dd>
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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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<br><dt><code>tls_ie_ha16</code><dd>
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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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<br><dt><code>tls_le</code><dd>
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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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<br><dt><code>tls_le_lo16</code><dd>
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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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<br><dt><code>tls_le_hi16</code><dd>
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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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<br><dt><code>tls_le_ha16</code><dd>
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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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<br><dt><code>tls_gd_call</code><dd>
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This modifier is used to tag an instrution as the “call” part of a
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calling sequence for a TLS GD reference of its operand.
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<br><dt><code>tls_gd_add</code><dd>
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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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<br><dt><code>tls_ie_load</code><dd>
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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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</dl>
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</body></html>
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