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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/cf7f36ae5e0ceee1c37a4c38464209f04647a470">cf7f36ae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-11T22:43:05Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Mmap into low memory on AArch64
This extends mmapForLinker to use the same low-memory mapping
strategy used on x86_64 on AArch64. See #16784.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/0b7f81f560c602f32cfc90fd3fb5f1c52f06ad49">0b7f81f5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-11T22:43:05Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Use mmapForLinker to map PLT
The PLT needs to be located within a close distance of
the code calling it under the small memory model.
Fixes #16784.
</pre>
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<h4>2 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#044fe9284335a9bfd17546e06c2e5c40a680dd3d">
rts/Linker.c
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<li class="file-stats">
<a href="#b7ec52d5e302083ed03503182f1293694dda24f3">
rts/linker/Elf.c
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<h4>Changes:</h4>
<li id="044fe9284335a9bfd17546e06c2e5c40a680dd3d">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/457fe7897d42e4359b6da6b359fd7ea8ae0f1d75...0b7f81f560c602f32cfc90fd3fb5f1c52f06ad49#044fe9284335a9bfd17546e06c2e5c40a680dd3d"><strong>rts/Linker.c</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -182,28 +182,37 @@ Mutex linker_unloaded_mutex;</td>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Generic wrapper function to try and Resolve and RunInit oc files */</span></span>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">ocTryLoad</span><span class="p">(</span> <span class="n" style="color: #333;">ObjectCode</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">oc</span> <span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Link objects into the lower 2Gb on x86_64. GHC assumes the</span></span>
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Link objects into the lower 2Gb on x86_64<span class="idiff left right"> and AArch64</span>. GHC assumes the</span></span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * small memory model on this architecture (see gcc docs,</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * -mcmodel=small).</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * MAP_32BIT not available on OpenBSD/amd64</span></span>
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<td class="diff-line-num old_line" data-linenumber="190" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(x86_64_HOST_ARCH) && defined(MAP_32BIT)</span></span>
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(MAP_32BIT) && defined(x86_64_HOST_ARCH)</span></span>
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define MAP_LOW_MEM</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define TRY_MAP_32BIT MAP_32BIT</span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define TRY_MAP_32BIT 0</span></span>
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(aarch64_HOST_ARCH)</span></span>
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// On AArch64 MAP_32BIT is not available but we are still bound by the small</span></span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// memory model. Consequently we still try using the MAP_LOW_MEM allocation</span></span>
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// strategy.</span></span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define MAP_LOW_MEM</span></span>
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Due to the small memory model (see above), on x86_64 we have to map</span></span>
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199
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * all our non-PIC object files into the low 2Gb of the address space</span></span>
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200
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * (why 2Gb and not 4Gb? Because all addresses must be reachable</span></span>
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201
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * using a 32-bit signed PC-relative offset). On Linux we can do this</span></span>
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202
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * using the MAP_32BIT flag to mmap(), however on other OSs</span></span>
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203
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * (e.g. *BSD, see #2063, and also on Linux inside Xen, see #2512), we</span></span>
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204
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * can't do this. So on these systems, we have to pick a base address</span></span>
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205
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * in the low 2Gb of the address space and try to allocate memory from</span></span>
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206
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * there.</span></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Note [MAP_LOW_MEM]</span></span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * ~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Due to the small memory model (see above), on x86_64 and AArch64 we have to</span></span>
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209
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * map all our non-PIC object files into the low 2Gb of the address space (why</span></span>
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210
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 2Gb and not 4Gb? Because all addresses must be reachable using a 32-bit</span></span>
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * signed PC-relative offset). On x86_64 Linux we can do this using the</span></span>
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212
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * MAP_32BIT flag to mmap(), however on other OSs (e.g. *BSD, see #2063, and</span></span>
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213
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * also on Linux inside Xen, see #2512), we can't do this. So on these</span></span>
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214
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * systems, we have to pick a base address in the low 2Gb of the address space</span></span>
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215
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * and try to allocate memory from there.</span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * We pick a default address based on the OS, but also make this</span></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * configurable via an RTS flag (+RTS -xm)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1015" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1006,7 +1015,7 @@ mmapForLinker (size_t bytes, uint32_t flags, int fd, int offset)</td>
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1006
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="c"> <span class="n" style="color: #333;">IF_DEBUG</span><span class="p">(</span><span class="n" style="color: #333;">linker</span><span class="p">,</span> <span class="n" style="color: #333;">debugBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"mmapForLinker: start</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">));</span></span>
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1007
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="c"> <span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">roundUpToPage</span><span class="p">(</span><span class="n" style="color: #333;">bytes</span><span class="p">);</span></span>
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1008
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="c"></span>
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1009
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<pre style="margin: 0;">-<span id="LC1009" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(<span class="idiff left right">x86_64_HOST_ARCH</span>)</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(<span class="idiff left right">MAP_LOW_MEM</span>)</span></span>
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1010
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="c"><span class="nl">mmap_again:</span></span>
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1011
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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1012
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="c"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1040" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1031,7 +1040,7 @@ mmap_again:</td>
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1031
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span></span>
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1032
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="c"> <span class="p">}</span></span>
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1033
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="c"></span>
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1034
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<pre style="margin: 0;">-<span id="LC1034" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(<span class="idiff left right">x86_64_HOST_ARCH</span>)</span></span>
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1043
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<pre style="margin: 0;">+<span id="LC1043" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(<span class="idiff left right">MAP_LOW_MEM</span>)</span></span>
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1035
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1044
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">MiscFlags</span><span class="p">.</span><span class="n" style="color: #333;">linkerAlwaysPic</span><span class="p">)</span> <span class="p">{</span></span>
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1036
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1045
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">mmap_32bit_base</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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1037
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1046
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">map_addr</span><span class="p">)</span> <span class="p">{</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/457fe7897d42e4359b6da6b359fd7ea8ae0f1d75...0b7f81f560c602f32cfc90fd3fb5f1c52f06ad49#b7ec52d5e302083ed03503182f1293694dda24f3"><strong>rts/linker/Elf.c</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -745,12 +745,8 @@ ocGetNames_ELF ( ObjectCode* oc )</td>
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<pre style="margin: 0;"> <span id="LC745" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="n" style="color: #333;">nstubs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">numberOfStubsForSection</span><span class="p">(</span><span class="n" style="color: #333;">oc</span><span class="p">,</span> <span class="n" style="color: #333;">i</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="n" style="color: #333;">stub_space</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">STUB_SIZE</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">nstubs</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC748" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">mem</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mmap</span><span class="p">(</span><span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="n" style="color: #333;">size</span><span class="o" style="font-weight: 600;">+</span><span class="n" style="color: #333;">stub_space</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC749" class="line" lang="c"> <span class="n" style="color: #333;">PROT_READ</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">PROT_WRITE</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">PROT_EXEC</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC750" class="line" lang="c"> <span class="n" style="color: #333;">MAP_ANON</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">MAP_PRIVATE</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC751" class="line" lang="c"> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC752" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC753" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span><span class="p">(</span> <span class="n" style="color: #333;">mem</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">MAP_FAILED</span> <span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">mem</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mmapForLinker</span><span class="p">(</span><span class="n" style="color: #333;">size</span><span class="o" style="font-weight: 600;">+</span><span class="n" style="color: #333;">stub_space</span><span class="p">,</span> <span class="n" style="color: #333;">MAP_ANON</span><span class="p">,</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span><span class="p">(</span> <span class="n" style="color: #333;">mem</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span> <span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"failed to mmap allocated memory to load section %d. "</span></span>
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="c"> <span class="s" style="color: #d14;">"errno = %d"</span><span class="p">,</span> <span class="n" style="color: #333;">i</span><span class="p">,</span> <span class="n" style="color: #333;">errno</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="c"> <span class="p">}</span></span>
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