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| <h3 class="section">4.11 <samp><span class="command">ld</span></samp> and SPU ELF Support</h3> |
| |
| <p><a name="index-SPU-ELF-options-644"></a> |
| |
| <a name="index-SPU-plugins-645"></a> |
| <a name="index-g_t_002d_002dplugin-646"></a> |
| <dl><dt><samp><span class="option">--plugin</span></samp><dd>This option marks an executable as a PIC plugin module. |
| |
| <p><a name="index-SPU-overlays-647"></a><a name="index-g_t_002d_002dno_002doverlays-648"></a><br><dt><samp><span class="option">--no-overlays</span></samp><dd>Normally, <samp><span class="command">ld</span></samp> recognizes calls to functions within overlay |
| regions, and redirects such calls to an overlay manager via a stub. |
| <samp><span class="command">ld</span></samp> also provides a built-in overlay manager. This option |
| turns off all this special overlay handling. |
| |
| <p><a name="index-SPU-overlay-stub-symbols-649"></a><a name="index-g_t_002d_002demit_002dstub_002dsyms-650"></a><br><dt><samp><span class="option">--emit-stub-syms</span></samp><dd>This option causes <samp><span class="command">ld</span></samp> to label overlay stubs with a local |
| symbol that encodes the stub type and destination. |
| |
| <p><a name="index-SPU-extra-overlay-stubs-651"></a><a name="index-g_t_002d_002dextra_002doverlay_002dstubs-652"></a><br><dt><samp><span class="option">--extra-overlay-stubs</span></samp><dd>This option causes <samp><span class="command">ld</span></samp> to add overlay call stubs on all |
| function calls out of overlay regions. Normally stubs are not added |
| on calls to non-overlay regions. |
| |
| <p><a name="index-SPU-local-store-size-653"></a><a name="index-g_t_002d_002dlocal_002dstore_003dlo_003ahi-654"></a><br><dt><samp><span class="option">--local-store=lo:hi</span></samp><dd><samp><span class="command">ld</span></samp> usually checks that a final executable for SPU fits in |
| the address range 0 to 256k. This option may be used to change the |
| range. Disable the check entirely with <samp><span class="option">--local-store=0:0</span></samp>. |
| |
| <p><a name="index-SPU-655"></a><a name="index-g_t_002d_002dstack_002danalysis-656"></a><br><dt><samp><span class="option">--stack-analysis</span></samp><dd>SPU local store space is limited. Over-allocation of stack space |
| unnecessarily limits space available for code and data, while |
| under-allocation results in runtime failures. If given this option, |
| <samp><span class="command">ld</span></samp> will provide an estimate of maximum stack usage. |
| <samp><span class="command">ld</span></samp> does this by examining symbols in code sections to |
| determine the extents of functions, and looking at function prologues |
| for stack adjusting instructions. A call-graph is created by looking |
| for relocations on branch instructions. The graph is then searched |
| for the maximum stack usage path. Note that this analysis does not |
| find calls made via function pointers, and does not handle recursion |
| and other cycles in the call graph. Stack usage may be |
| under-estimated if your code makes such calls. Also, stack usage for |
| dynamic allocation, e.g. alloca, will not be detected. If a link map |
| is requested, detailed information about each function's stack usage |
| and calls will be given. |
| |
| <p><a name="index-SPU-657"></a><a name="index-g_t_002d_002demit_002dstack_002dsyms-658"></a><br><dt><samp><span class="option">--emit-stack-syms</span></samp><dd>This option, if given along with <samp><span class="option">--stack-analysis</span></samp> will result |
| in <samp><span class="command">ld</span></samp> emitting stack sizing symbols for each function. |
| These take the form <code>__stack_<function_name></code> for global |
| functions, and <code>__stack_<number>_<function_name></code> for static |
| functions. <code><number></code> is the section id in hex. The value of |
| such symbols is the stack requirement for the corresponding function. |
| The symbol size will be zero, type <code>STT_NOTYPE</code>, binding |
| <code>STB_LOCAL</code>, and section <code>SHN_ABS</code>. |
| </dl> |
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