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| <h4 class="subsection">9.31.3 Nios II Machine Relocations</h4> |
| |
| <p><a name="index-machine-relocations_002c-Nios-II-1784"></a><a name="index-Nios-II-machine-relocations-1785"></a> |
| |
| <a name="index-g_t_0040code_007bhiadj_007d-directive_002c-Nios-II-1786"></a> |
| <dl><dt><code>%hiadj(</code><var>expression</var><code>)</code><dd>Extract the upper 16 bits of <var>expression</var> and add |
| one if the 15th bit is set. |
| |
| <p>The value of <code>%hiadj(</code><var>expression</var><code>)</code> is: |
| <pre class="smallexample"> ((<var>expression</var> >> 16) & 0xffff) + ((<var>expression</var> >> 15) & 0x01) |
| </pre> |
| <p>The <code>%hiadj</code> relocation is intended to be used with |
| the <code>addi</code>, <code>ld</code> or <code>st</code> instructions |
| along with a <code>%lo</code>, in order to load a 32-bit constant. |
| |
| <pre class="smallexample"> movhi r2, %hiadj(symbol) |
| addi r2, r2, %lo(symbol) |
| </pre> |
| <p><a name="index-g_t_0040code_007bhi_007d-directive_002c-Nios-II-1787"></a><br><dt><code>%hi(</code><var>expression</var><code>)</code><dd>Extract the upper 16 bits of <var>expression</var>. |
| |
| <p><a name="index-g_t_0040code_007blo_007d-directive_002c-Nios-II-1788"></a><br><dt><code>%lo(</code><var>expression</var><code>)</code><dd>Extract the lower 16 bits of <var>expression</var>. |
| |
| <p><a name="index-g_t_0040code_007bgprel_007d-directive_002c-Nios-II-1789"></a><br><dt><code>%gprel(</code><var>expression</var><code>)</code><dd>Subtract the value of the symbol <code>_gp</code> from |
| <var>expression</var>. |
| |
| <p>The intention of the <code>%gprel</code> relocation is |
| to have a fast small area of memory which only |
| takes a 16-bit immediate to access. |
| |
| <pre class="smallexample"> .section .sdata |
| fastint: |
| .int 123 |
| .section .text |
| ldw r4, %gprel(fastint)(gp) |
| </pre> |
| <p><a name="index-g_t_0040code_007bcall_007d-directive_002c-Nios-II-1790"></a><a name="index-g_t_0040code_007bcall_005flo_007d-directive_002c-Nios-II-1791"></a><a name="index-g_t_0040code_007bcall_005fhiadj_007d-directive_002c-Nios-II-1792"></a><a name="index-g_t_0040code_007bgot_007d-directive_002c-Nios-II-1793"></a><a name="index-g_t_0040code_007bgot_005flo_007d-directive_002c-Nios-II-1794"></a><a name="index-g_t_0040code_007bgot_005fhiadj_007d-directive_002c-Nios-II-1795"></a><a name="index-g_t_0040code_007bgotoff_007d-directive_002c-Nios-II-1796"></a><a name="index-g_t_0040code_007bgotoff_005flo_007d-directive_002c-Nios-II-1797"></a><a name="index-g_t_0040code_007bgotoff_005fhiadj_007d-directive_002c-Nios-II-1798"></a><a name="index-g_t_0040code_007btls_005fgd_007d-directive_002c-Nios-II-1799"></a><a name="index-g_t_0040code_007btls_005fie_007d-directive_002c-Nios-II-1800"></a><a name="index-g_t_0040code_007btls_005fle_007d-directive_002c-Nios-II-1801"></a><a name="index-g_t_0040code_007btls_005fldm_007d-directive_002c-Nios-II-1802"></a><a name="index-g_t_0040code_007btls_005fldo_007d-directive_002c-Nios-II-1803"></a><br><dt><code>%call(</code><var>expression</var><code>)</code><br><dt><code>%call_lo(</code><var>expression</var><code>)</code><br><dt><code>%call_hiadj(</code><var>expression</var><code>)</code><dt><code>%got(</code><var>expression</var><code>)</code><dt><code>%got_lo(</code><var>expression</var><code>)</code><dt><code>%got_hiadj(</code><var>expression</var><code>)</code><dt><code>%gotoff(</code><var>expression</var><code>)</code><dt><code>%gotoff_lo(</code><var>expression</var><code>)</code><dt><code>%gotoff_hiadj(</code><var>expression</var><code>)</code><dt><code>%tls_gd(</code><var>expression</var><code>)</code><dt><code>%tls_ie(</code><var>expression</var><code>)</code><dt><code>%tls_le(</code><var>expression</var><code>)</code><dt><code>%tls_ldm(</code><var>expression</var><code>)</code><dt><code>%tls_ldo(</code><var>expression</var><code>)</code><dd> |
| These relocations support the ABI for Linux Systems documented in the |
| <cite>Nios II Processor Reference Handbook</cite>. |
| </dl> |
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