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| <h5 class="subsubsection">9.42.5.7 absolute-literals</h5> |
| |
| <p><a name="index-g_t_0040code_007babsolute_002dliterals_007d-directive-2054"></a><a name="index-g_t_0040code_007bno_002dabsolute_002dliterals_007d-directive-2055"></a> |
| The <code>absolute-literals</code> and <code>no-absolute-literals</code> |
| directives control the absolute vs. PC-relative mode for <code>L32R</code> |
| instructions. These are relevant only for Xtensa configurations that |
| include the absolute addressing option for <code>L32R</code> instructions. |
| |
| <pre class="smallexample"> .begin [no-]absolute-literals |
| .end [no-]absolute-literals |
| </pre> |
| <p>These directives do not change the <code>L32R</code> mode—they only cause |
| the assembler to emit the appropriate kind of relocation for <code>L32R</code> |
| instructions and to place the literal values in the appropriate section. |
| To change the <code>L32R</code> mode, the program must write the |
| <code>LITBASE</code> special register. It is the programmer's responsibility |
| to keep track of the mode and indicate to the assembler which mode is |
| used in each region of code. |
| |
| <p>If the Xtensa configuration includes the absolute <code>L32R</code> addressing |
| option, the default is to assume absolute <code>L32R</code> addressing unless |
| the ‘<samp><span class="samp">--no-absolute-literals</span></samp>’ command-line option is specified. |
| Otherwise, the default is to assume PC-relative <code>L32R</code> addressing. |
| The <code>absolute-literals</code> directive can then be used to override |
| the default determined by the command-line options. |
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