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<h5 class="subsubsection">9.45.2.3 Symbolic Operand Modifiers</h5>
<p><a name="index-TILE_002dGx-modifiers-2233"></a><a name="index-symbol-modifiers_002c-TILE_002dGx-2234"></a>
The assembler supports several modifiers when using symbol addresses
in TILE-Gx instruction operands. The general syntax is the following:
<pre class="smallexample"> modifier(symbol)
</pre>
<p>The following modifiers are supported:
<dl>
<dt><code>hw0</code><dd>
This modifier is used to load bits 0-15 of the symbol's address.
<br><dt><code>hw1</code><dd>
This modifier is used to load bits 16-31 of the symbol's address.
<br><dt><code>hw2</code><dd>
This modifier is used to load bits 32-47 of the symbol's address.
<br><dt><code>hw3</code><dd>
This modifier is used to load bits 48-63 of the symbol's address.
<br><dt><code>hw0_last</code><dd>
This modifier yields the same value as <code>hw0</code>, but it also checks
that the value does not overflow.
<br><dt><code>hw1_last</code><dd>
This modifier yields the same value as <code>hw1</code>, but it also checks
that the value does not overflow.
<br><dt><code>hw2_last</code><dd>
This modifier yields the same value as <code>hw2</code>, but it also checks
that the value does not overflow.
<p>A 48-bit symbolic value is constructed by using the following idiom:
<pre class="smallexample"> moveli r0, hw2_last(sym)
shl16insli r0, r0, hw1(sym)
shl16insli r0, r0, hw0(sym)
</pre>
<br><dt><code>hw0_got</code><dd>
This modifier is used to load bits 0-15 of the symbol's offset in the
GOT entry corresponding to the symbol.
<br><dt><code>hw0_last_got</code><dd>
This modifier yields the same value as <code>hw0_got</code>, but it also
checks that the value does not overflow.
<br><dt><code>hw1_last_got</code><dd>
This modifier is used to load bits 16-31 of the symbol's offset in the
GOT entry corresponding to the symbol, and it also checks that the
value does not overflow.
<br><dt><code>plt</code><dd>
This modifier is used for function symbols. It causes a
<em>procedure linkage table</em>, an array of code stubs, to be created
at the time the shared object is created or linked against, together
with a global offset table entry. The value is a pc-relative offset
to the corresponding stub code in the procedure linkage table. This
arrangement causes the run-time symbol resolver to be called to look
up and set the value of the symbol the first time the function is
called (at latest; depending environment variables). It is only safe
to leave the symbol unresolved this way if all references are function
calls.
<br><dt><code>hw0_plt</code><dd>
This modifier is used to load bits 0-15 of the pc-relative address of
a plt entry.
<br><dt><code>hw1_plt</code><dd>
This modifier is used to load bits 16-31 of the pc-relative address of
a plt entry.
<br><dt><code>hw1_last_plt</code><dd>
This modifier yields the same value as <code>hw1_plt</code>, but it also
checks that the value does not overflow.
<br><dt><code>hw2_last_plt</code><dd>
This modifier is used to load bits 32-47 of the pc-relative address of
a plt entry, and it also checks that the value does not overflow.
<br><dt><code>hw0_tls_gd</code><dd>
This modifier is used to load bits 0-15 of the offset of the GOT entry
of the symbol's TLS descriptor, to be used for general-dynamic TLS
accesses.
<br><dt><code>hw0_last_tls_gd</code><dd>
This modifier yields the same value as <code>hw0_tls_gd</code>, but it also
checks that the value does not overflow.
<br><dt><code>hw1_last_tls_gd</code><dd>
This modifier is used to load bits 16-31 of the offset of the GOT
entry of the symbol's TLS descriptor, to be used for general-dynamic
TLS accesses. It also checks that the value does not overflow.
<br><dt><code>hw0_tls_ie</code><dd>
This modifier is used to load bits 0-15 of the offset of the GOT entry
containing the offset of the symbol's address from the TCB, to be used
for initial-exec TLS accesses.
<br><dt><code>hw0_last_tls_ie</code><dd>
This modifier yields the same value as <code>hw0_tls_ie</code>, but it also
checks that the value does not overflow.
<br><dt><code>hw1_last_tls_ie</code><dd>
This modifier is used to load bits 16-31 of the offset of the GOT
entry containing the offset of the symbol's address from the TCB, to
be used for initial-exec TLS accesses. It also checks that the value
does not overflow.
<br><dt><code>hw0_tls_le</code><dd>
This modifier is used to load bits 0-15 of the offset of the symbol's
address from the TCB, to be used for local-exec TLS accesses.
<br><dt><code>hw0_last_tls_le</code><dd>
This modifier yields the same value as <code>hw0_tls_le</code>, but it also
checks that the value does not overflow.
<br><dt><code>hw1_last_tls_le</code><dd>
This modifier is used to load bits 16-31 of the offset of the symbol's
address from the TCB, to be used for local-exec TLS accesses. It
also checks that the value does not overflow.
<br><dt><code>tls_gd_call</code><dd>
This modifier is used to tag an instrution as the “call” part of a
calling sequence for a TLS GD reference of its operand.
<br><dt><code>tls_gd_add</code><dd>
This modifier is used to tag an instruction as the “add” part of a
calling sequence for a TLS GD reference of its operand.
<br><dt><code>tls_ie_load</code><dd>
This modifier is used to tag an instruction as the “load” part of a
calling sequence for a TLS IE reference of its operand.
</dl>
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