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| <h5 class="subsubsection">9.19.2.2 Relocatable Expression Modifiers</h5> |
| |
| <p><a name="index-LM32-modifiers-1322"></a><a name="index-syntax_002c-LM32-1323"></a> |
| The assembler supports several modifiers when using relocatable addresses |
| in LM32 instruction operands. The general syntax is the following: |
| |
| <pre class="smallexample"> modifier(relocatable-expression) |
| </pre> |
| |
| <a name="index-symbol-modifiers-1324"></a> |
| <dl> |
| <dt><code>lo</code><dd> |
| This modifier allows you to use bits 0 through 15 of |
| an address expression as 16 bit relocatable expression. |
| |
| <br><dt><code>hi</code><dd> |
| This modifier allows you to use bits 16 through 23 of an address expression |
| as 16 bit relocatable expression. |
| |
| <p>For example |
| |
| <pre class="smallexample"> ori r4, r4, lo(sym+10) |
| orhi r4, r4, hi(sym+10) |
| </pre> |
| <br><dt><code>gp</code><dd> |
| This modified creates a 16-bit relocatable expression that is |
| the offset of the symbol from the global pointer. |
| |
| <pre class="smallexample"> mva r4, gp(sym) |
| </pre> |
| <br><dt><code>got</code><dd> |
| This modifier places a symbol in the GOT and creates a 16-bit |
| relocatable expression that is the offset into the GOT of this |
| symbol. |
| |
| <pre class="smallexample"> lw r4, (gp+got(sym)) |
| </pre> |
| <br><dt><code>gotofflo16</code><dd> |
| This modifier allows you to use the bits 0 through 15 of an |
| address which is an offset from the GOT. |
| |
| <br><dt><code>gotoffhi16</code><dd> |
| This modifier allows you to use the bits 16 through 31 of an |
| address which is an offset from the GOT. |
| |
| <pre class="smallexample"> orhi r4, r4, gotoffhi16(lsym) |
| addi r4, r4, gotofflo16(lsym) |
| </pre> |
| </dl> |
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