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<!--
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This file documents the GNU linker LD
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(GNU Binutils)
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version 2.26.
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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<a name="SPU-ELF"></a>
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Next: <a rel="next" accesskey="n" href="TI-COFF.html#TI-COFF">TI COFF</a>,
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Previous: <a rel="previous" accesskey="p" href="PowerPC64-ELF64.html#PowerPC64-ELF64">PowerPC64 ELF64</a>,
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Up: <a rel="up" accesskey="u" href="Machine-Dependent.html#Machine-Dependent">Machine Dependent</a>
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<h3 class="section">4.14 <samp><span class="command">ld</span></samp> and SPU ELF Support</h3>
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<p><a name="index-SPU-ELF-options-710"></a>
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<a name="index-SPU-plugins-711"></a>
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<a name="index-g_t_002d_002dplugin-712"></a>
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<dl><dt><samp><span class="option">--plugin</span></samp><dd>This option marks an executable as a PIC plugin module.
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<p><a name="index-SPU-overlays-713"></a><a name="index-g_t_002d_002dno_002doverlays-714"></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
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regions, and redirects such calls to an overlay manager via a stub.
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<samp><span class="command">ld</span></samp> also provides a built-in overlay manager. This option
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turns off all this special overlay handling.
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<p><a name="index-SPU-overlay-stub-symbols-715"></a><a name="index-g_t_002d_002demit_002dstub_002dsyms-716"></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
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symbol that encodes the stub type and destination.
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<p><a name="index-SPU-extra-overlay-stubs-717"></a><a name="index-g_t_002d_002dextra_002doverlay_002dstubs-718"></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
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function calls out of overlay regions. Normally stubs are not added
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on calls to non-overlay regions.
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<p><a name="index-SPU-local-store-size-719"></a><a name="index-g_t_002d_002dlocal_002dstore_003dlo_003ahi-720"></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
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the address range 0 to 256k. This option may be used to change the
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range. Disable the check entirely with <samp><span class="option">--local-store=0:0</span></samp>.
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<p><a name="index-SPU-721"></a><a name="index-g_t_002d_002dstack_002danalysis-722"></a><br><dt><samp><span class="option">--stack-analysis</span></samp><dd>SPU local store space is limited. Over-allocation of stack space
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unnecessarily limits space available for code and data, while
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under-allocation results in runtime failures. If given this option,
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<samp><span class="command">ld</span></samp> will provide an estimate of maximum stack usage.
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<samp><span class="command">ld</span></samp> does this by examining symbols in code sections to
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determine the extents of functions, and looking at function prologues
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for stack adjusting instructions. A call-graph is created by looking
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for relocations on branch instructions. The graph is then searched
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for the maximum stack usage path. Note that this analysis does not
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find calls made via function pointers, and does not handle recursion
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and other cycles in the call graph. Stack usage may be
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under-estimated if your code makes such calls. Also, stack usage for
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dynamic allocation, e.g. alloca, will not be detected. If a link map
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is requested, detailed information about each function's stack usage
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and calls will be given.
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<p><a name="index-SPU-723"></a><a name="index-g_t_002d_002demit_002dstack_002dsyms-724"></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
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in <samp><span class="command">ld</span></samp> emitting stack sizing symbols for each function.
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These take the form <code>__stack_<function_name></code> for global
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functions, and <code>__stack_<number>_<function_name></code> for static
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functions. <code><number></code> is the section id in hex. The value of
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such symbols is the stack requirement for the corresponding function.
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The symbol size will be zero, type <code>STT_NOTYPE</code>, binding
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<code>STB_LOCAL</code>, and section <code>SHN_ABS</code>.
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</dl>
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</body></html>
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