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| <a name="TILEPro-Modifiers"></a> |
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| <h5 class="subsubsection">9.48.2.3 Symbolic Operand Modifiers</h5> |
| |
| <p><a name="index-TILEPro-modifiers-2399"></a><a name="index-symbol-modifiers_002c-TILEPro-2400"></a> |
| The assembler supports several modifiers when using symbol addresses |
| in TILEPro instruction operands. The general syntax is the following: |
| |
| <pre class="smallexample"> modifier(symbol) |
| </pre> |
| <p>The following modifiers are supported: |
| |
| <dl> |
| <dt><code>lo16</code><dd> |
| This modifier is used to load the low 16 bits of the symbol's address, |
| sign-extended to a 32-bit value (sign-extension allows it to be |
| range-checked against signed 16 bit immediate operands without |
| complaint). |
| |
| <br><dt><code>hi16</code><dd> |
| This modifier is used to load the high 16 bits of the symbol's |
| address, also sign-extended to a 32-bit value. |
| |
| <br><dt><code>ha16</code><dd> |
| <code>ha16(N)</code> is identical to <code>hi16(N)</code>, except if |
| <code>lo16(N)</code> is negative it adds one to the <code>hi16(N)</code> |
| value. This way <code>lo16</code> and <code>ha16</code> can be added to create any |
| 32-bit value using <code>auli</code>. For example, here is how you move an |
| arbitrary 32-bit address into r3: |
| |
| <pre class="smallexample"> moveli r3, lo16(sym) |
| auli r3, r3, ha16(sym) |
| </pre> |
| <br><dt><code>got</code><dd> |
| This modifier is used to load the offset of the GOT entry |
| corresponding to the symbol. |
| |
| <br><dt><code>got_lo16</code><dd> |
| This modifier is used to load the sign-extended low 16 bits of the |
| offset of the GOT entry corresponding to the symbol. |
| |
| <br><dt><code>got_hi16</code><dd> |
| This modifier is used to load the sign-extended high 16 bits of the |
| offset of the GOT entry corresponding to the symbol. |
| |
| <br><dt><code>got_ha16</code><dd> |
| This modifier is like <code>got_hi16</code>, but it adds one if |
| <code>got_lo16</code> of the input value is negative. |
| |
| <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>tls_gd</code><dd> |
| This modifier is used to load the offset of the GOT entry of the |
| symbol's TLS descriptor, to be used for general-dynamic TLS accesses. |
| |
| <br><dt><code>tls_gd_lo16</code><dd> |
| This modifier is used to load the sign-extended low 16 bits of the |
| offset of the GOT entry of the symbol's TLS descriptor, to be used for |
| general dynamic TLS accesses. |
| |
| <br><dt><code>tls_gd_hi16</code><dd> |
| This modifier is used to load the sign-extended high 16 bits of the |
| offset of the GOT entry of the symbol's TLS descriptor, to be used for |
| general dynamic TLS accesses. |
| |
| <br><dt><code>tls_gd_ha16</code><dd> |
| This modifier is like <code>tls_gd_hi16</code>, but it adds one to the value |
| if <code>tls_gd_lo16</code> of the input value is negative. |
| |
| <br><dt><code>tls_ie</code><dd> |
| This modifier is used to load 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>tls_ie_lo16</code><dd> |
| This modifier is used to load the low 16 bits 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>tls_ie_hi16</code><dd> |
| This modifier is used to load the high 16 bits 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>tls_ie_ha16</code><dd> |
| This modifier is like <code>tls_ie_hi16</code>, but it adds one to the value |
| if <code>tls_ie_lo16</code> of the input value is negative. |
| |
| <br><dt><code>tls_le</code><dd> |
| This modifier is used to load the offset of the symbol's address from |
| the TCB, to be used for local-exec TLS accesses. |
| |
| <br><dt><code>tls_le_lo16</code><dd> |
| This modifier is used to load the low 16 bits of the offset of the |
| symbol's address from the TCB, to be used for local-exec TLS accesses. |
| |
| <br><dt><code>tls_le_hi16</code><dd> |
| This modifier is used to load the high 16 bits of the offset of the |
| symbol's address from the TCB, to be used for local-exec TLS accesses. |
| |
| <br><dt><code>tls_le_ha16</code><dd> |
| This modifier is like <code>tls_le_hi16</code>, but it adds one to the value |
| if <code>tls_le_lo16</code> of the input value is negative. |
| |
| <br><dt><code>tls_gd_call</code><dd> |
| This modifier is used to tag an instruction 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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