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187 lines
7.4 KiB
HTML
4 years ago
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<title>TILE-Gx Modifiers - Using as</title>
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<!--
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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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Permission is granted to copy, distribute and/or modify this document
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Back-Cover Texts. A copy of the license is included in the
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<div class="node">
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<a name="TILE-Gx-Modifiers"></a>
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<a name="TILE_002dGx-Modifiers"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="TILE_002dGx-Registers.html#TILE_002dGx-Registers">TILE-Gx Registers</a>,
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Up: <a rel="up" accesskey="u" href="TILE_002dGx-Syntax.html#TILE_002dGx-Syntax">TILE-Gx Syntax</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.45.2.3 Symbolic Operand Modifiers</h5>
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<p><a name="index-TILE_002dGx-modifiers-2233"></a><a name="index-symbol-modifiers_002c-TILE_002dGx-2234"></a>
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The assembler supports several modifiers when using symbol addresses
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in TILE-Gx 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>hw0</code><dd>
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This modifier is used to load bits 0-15 of the symbol's address.
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<br><dt><code>hw1</code><dd>
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This modifier is used to load bits 16-31 of the symbol's address.
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<br><dt><code>hw2</code><dd>
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This modifier is used to load bits 32-47 of the symbol's address.
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<br><dt><code>hw3</code><dd>
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This modifier is used to load bits 48-63 of the symbol's address.
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<br><dt><code>hw0_last</code><dd>
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This modifier yields the same value as <code>hw0</code>, but it also checks
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that the value does not overflow.
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<br><dt><code>hw1_last</code><dd>
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This modifier yields the same value as <code>hw1</code>, but it also checks
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that the value does not overflow.
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<br><dt><code>hw2_last</code><dd>
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This modifier yields the same value as <code>hw2</code>, but it also checks
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that the value does not overflow.
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<p>A 48-bit symbolic value is constructed by using the following idiom:
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<pre class="smallexample"> moveli r0, hw2_last(sym)
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shl16insli r0, r0, hw1(sym)
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shl16insli r0, r0, hw0(sym)
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</pre>
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<br><dt><code>hw0_got</code><dd>
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This modifier is used to load bits 0-15 of the symbol's offset in the
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GOT entry corresponding to the symbol.
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<br><dt><code>hw0_last_got</code><dd>
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This modifier yields the same value as <code>hw0_got</code>, but it also
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checks that the value does not overflow.
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<br><dt><code>hw1_last_got</code><dd>
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This modifier is used to load bits 16-31 of the symbol's offset in the
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GOT entry corresponding to the symbol, and it also checks that the
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value does not overflow.
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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>hw0_plt</code><dd>
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This modifier is used to load bits 0-15 of the pc-relative address of
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a plt entry.
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<br><dt><code>hw1_plt</code><dd>
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This modifier is used to load bits 16-31 of the pc-relative address of
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a plt entry.
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<br><dt><code>hw1_last_plt</code><dd>
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This modifier yields the same value as <code>hw1_plt</code>, but it also
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checks that the value does not overflow.
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<br><dt><code>hw2_last_plt</code><dd>
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This modifier is used to load bits 32-47 of the pc-relative address of
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a plt entry, and it also checks that the value does not overflow.
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<br><dt><code>hw0_tls_gd</code><dd>
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This modifier is used to load bits 0-15 of the offset of the GOT entry
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of the symbol's TLS descriptor, to be used for general-dynamic TLS
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accesses.
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<br><dt><code>hw0_last_tls_gd</code><dd>
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This modifier yields the same value as <code>hw0_tls_gd</code>, but it also
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checks that the value does not overflow.
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<br><dt><code>hw1_last_tls_gd</code><dd>
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This modifier is used to load bits 16-31 of the offset of the GOT
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entry of the symbol's TLS descriptor, to be used for general-dynamic
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TLS accesses. It also checks that the value does not overflow.
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<br><dt><code>hw0_tls_ie</code><dd>
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This modifier is used to load bits 0-15 of the offset of the GOT entry
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containing the offset of the symbol's address from the TCB, to be used
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for initial-exec TLS accesses.
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<br><dt><code>hw0_last_tls_ie</code><dd>
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This modifier yields the same value as <code>hw0_tls_ie</code>, but it also
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checks that the value does not overflow.
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<br><dt><code>hw1_last_tls_ie</code><dd>
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This modifier is used to load bits 16-31 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. It also checks that the value
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does not overflow.
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<br><dt><code>hw0_tls_le</code><dd>
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This modifier is used to load bits 0-15 of the offset of the symbol's
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address from the TCB, to be used for local-exec TLS accesses.
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<br><dt><code>hw0_last_tls_le</code><dd>
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This modifier yields the same value as <code>hw0_tls_le</code>, but it also
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checks that the value does not overflow.
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<br><dt><code>hw1_last_tls_le</code><dd>
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This modifier is used to load bits 16-31 of the offset of the symbol's
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address from the TCB, to be used for local-exec TLS accesses. It
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also checks that the value does not overflow.
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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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