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| <h4 class="subsection">9.1.4 AArch64 Machine Directives</h4> |
| |
| <p><a name="index-machine-directives_002c-AArch64-536"></a><a name="index-AArch64-machine-directives-537"></a> |
| <dl> |
| <!-- AAAAAAAAAAAAAAAAAAAAAAAAA --> |
| <!-- BBBBBBBBBBBBBBBBBBBBBBBBBB --> |
| |
| <p><a name="index-g_t_0040code_007b_002ebss_007d-directive_002c-AArch64-538"></a><dt><code>.bss</code><dd>This directive switches to the <code>.bss</code> section. |
| |
| <!-- CCCCCCCCCCCCCCCCCCCCCCCCCC --> |
| <!-- DDDDDDDDDDDDDDDDDDDDDDDDDD --> |
| <!-- EEEEEEEEEEEEEEEEEEEEEEEEEE --> |
| <!-- FFFFFFFFFFFFFFFFFFFFFFFFFF --> |
| <!-- GGGGGGGGGGGGGGGGGGGGGGGGGG --> |
| <!-- HHHHHHHHHHHHHHHHHHHHHHHHHH --> |
| <!-- IIIIIIIIIIIIIIIIIIIIIIIIII --> |
| <!-- JJJJJJJJJJJJJJJJJJJJJJJJJJ --> |
| <!-- KKKKKKKKKKKKKKKKKKKKKKKKKK --> |
| <!-- LLLLLLLLLLLLLLLLLLLLLLLLLL --> |
| <p><a name="index-g_t_0040code_007b_002eltorg_007d-directive_002c-AArch64-539"></a><br><dt><code>.ltorg</code><dd>This directive causes the current contents of the literal pool to be |
| dumped into the current section (which is assumed to be the .text |
| section) at the current location (aligned to a word boundary). |
| <code>GAS</code> maintains a separate literal pool for each section and each |
| sub-section. The <code>.ltorg</code> directive will only affect the literal |
| pool of the current section and sub-section. At the end of assembly |
| all remaining, un-empty literal pools will automatically be dumped. |
| |
| <p>Note - older versions of <code>GAS</code> would dump the current literal |
| pool any time a section change occurred. This is no longer done, since |
| it prevents accurate control of the placement of literal pools. |
| |
| <!-- MMMMMMMMMMMMMMMMMMMMMMMMMM --> |
| <!-- NNNNNNNNNNNNNNNNNNNNNNNNNN --> |
| <!-- OOOOOOOOOOOOOOOOOOOOOOOOOO --> |
| <!-- PPPPPPPPPPPPPPPPPPPPPPPPPP --> |
| <p><a name="index-g_t_0040code_007b_002epool_007d-directive_002c-AArch64-540"></a><br><dt><code>.pool</code><dd>This is a synonym for .ltorg. |
| |
| <!-- QQQQQQQQQQQQQQQQQQQQQQQQQQ --> |
| <!-- RRRRRRRRRRRRRRRRRRRRRRRRRR --> |
| <p><a name="index-g_t_0040code_007b_002ereq_007d-directive_002c-AArch64-541"></a><br><dt><var>name</var><code> .req </code><var>register name</var><dd>This creates an alias for <var>register name</var> called <var>name</var>. For |
| example: |
| |
| <pre class="smallexample"> foo .req w0 |
| </pre> |
| <!-- SSSSSSSSSSSSSSSSSSSSSSSSSS --> |
| <!-- TTTTTTTTTTTTTTTTTTTTTTTTTT --> |
| <!-- UUUUUUUUUUUUUUUUUUUUUUUUUU --> |
| <p><a name="index-g_t_0040code_007b_002eunreq_007d-directive_002c-AArch64-542"></a><br><dt><code>.unreq </code><var>alias-name</var><dd>This undefines a register alias which was previously defined using the |
| <code>req</code> directive. For example: |
| |
| <pre class="smallexample"> foo .req w0 |
| .unreq foo |
| </pre> |
| <p>An error occurs if the name is undefined. Note - this pseudo op can |
| be used to delete builtin in register name aliases (eg 'w0'). This |
| should only be done if it is really necessary. |
| |
| <!-- VVVVVVVVVVVVVVVVVVVVVVVVVV --> |
| <!-- WWWWWWWWWWWWWWWWWWWWWWWWWW --> |
| <!-- XXXXXXXXXXXXXXXXXXXXXXXXXX --> |
| <!-- YYYYYYYYYYYYYYYYYYYYYYYYYY --> |
| <!-- ZZZZZZZZZZZZZZZZZZZZZZZZZZ --> |
| </dl> |
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