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| <h5 class="subsubsection">9.42.2.3 Symbolic Operand Modifiers</h5> |
| |
| <p><a name="index-TILE_002dGx-modifiers-2033"></a><a name="index-symbol-modifiers_002c-TILE_002dGx-2034"></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_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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