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<h3>
Raymond Toy pushed to branch sparc64-dev-nyi
at <a href="https://gitlab.common-lisp.net/cmucl/cmucl">cmucl / cmucl</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.common-lisp.net/cmucl/cmucl/commit/0661784461fda653dfb2fc155c6e7cf89e46fbbc">06617844</a></strong>
<div>
<span>by Raymond Toy</span>
<i>at 2017-01-18T20:53:28-08:00</i>
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<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Correct the implementation of the not-implmeented handler.
The location of the string was off by one word and the length was
incorrectly calculated because we have a 19-bit word displacement for
the ba,pt instruction.
</pre>
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<h4>1 changed file:</h4>
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<a href="#ee1885916c636477026c686b59070a7c2ca7fb81" style="text-decoration: none">
src/lisp/sparc-arch.c
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<h4>Changes:</h4>
<li id="ee1885916c636477026c686b59070a7c2ca7fb81">
<a href="https://gitlab.common-lisp.net/cmucl/cmucl/commit/0661784461fda653dfb2fc155c6e7cf89e46fbbc#ee1885916c636477026c686b59070a7c2ca7fb81"><strong>src/lisp/sparc-arch.c</strong></a>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -522,12 +522,19 @@ sigill_handler(HANDLER_ARGS)</td>
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<pre style="margin: 0"> <span id="LC522" class="line"></span>
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<pre style="margin: 0"> <span id="LC523" class="line"> <span class="cm" style="color: #998; font-style: italic">/*</span></span>
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524
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<pre style="margin: 0"> <span id="LC524" class="line"><span class="cm" style="color: #998; font-style: italic"> * Compute the maximum length of the string from the</span></span>
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<pre style="margin: 0">-<span id="LC525" class="line"><span class="cm" style="color: #998; font-style: italic"> * offset in the branch instruction. (The signed offset</span></span>
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<pre style="margin: 0">-<span id="LC526" class="line"><span class="cm" style="color: #998; font-style: italic"> * is in the low 22 bits of the instruction.) Then try</span></span>
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<pre style="margin: 0">-<span id="LC527" class="line"><span class="cm" style="color: #998; font-style: italic"> * to find the last nul character for end of the string.</span></span>
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<pre style="margin: 0">+<span id="LC525" class="line"><span class="cm" style="color: #998; font-style: italic"> * offset in the branch instruction. This code assumes</span></span>
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<pre style="margin: 0">+<span id="LC526" class="line"><span class="cm" style="color: #998; font-style: italic"> * a ba,pt instruction which has a 19-bit word offset in</span></span>
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<pre style="margin: 0">+<span id="LC527" class="line"><span class="cm" style="color: #998; font-style: italic"> * the low part of the instruction. Because branches</span></span>
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<pre style="margin: 0">+<span id="LC528" class="line"><span class="cm" style="color: #998; font-style: italic"> * have a delay slot, the string starts two words past</span></span>
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<pre style="margin: 0">+<span id="LC529" class="line"><span class="cm" style="color: #998; font-style: italic"> * the branch instruction.</span></span>
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<pre style="margin: 0"> <span id="LC530" class="line"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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<pre style="margin: 0">-<span id="LC529" class="line"> <span class="n" style="color: #333">string</span> <span class="o" style="font-weight: bold">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: bold">unsigned</span> <span class="kt" style="color: #458; font-weight: bold">char</span> <span class="o" style="font-weight: bold">*</span><span class="p">)</span> <span class="o" style="font-weight: bold">&</span><span class="n" style="color: #333">pc</span><span class="p">[</span><span class="mi" style="color: #099">2</span><span class="p">];</span></span>
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<pre style="margin: 0">-<span id="LC530" class="line"> <span class="n" style="color: #333">length</span> <span class="o" style="font-weight: bold">=</span> <span class="p">(</span><span class="n" style="color: #333">pc</span><span class="p">[</span><span class="mi" style="color: #099">1</span><span class="p">]</span> <span class="o" style="font-weight: bold">&</span> <span class="mh" style="color: #099">0x3fffff</span><span class="p">);</span></span>
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<pre style="margin: 0">+<span id="LC531" class="line"> <span class="n" style="color: #333">string</span> <span class="o" style="font-weight: bold">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: bold">unsigned</span> <span class="kt" style="color: #458; font-weight: bold">char</span> <span class="o" style="font-weight: bold">*</span><span class="p">)</span> <span class="o" style="font-weight: bold">&</span><span class="n" style="color: #333">pc</span><span class="p">[</span><span class="mi" style="color: #099">3</span><span class="p">];</span></span>
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<pre style="margin: 0">+<span id="LC532" class="line"> <span class="cm" style="color: #998; font-style: italic">/*</span></span>
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<pre style="margin: 0">+<span id="LC533" class="line"><span class="cm" style="color: #998; font-style: italic"> * The offset is in 32-bit words, so subtract one for</span></span>
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<pre style="margin: 0">+<span id="LC534" class="line"><span class="cm" style="color: #998; font-style: italic"> * the instruction in the branch delay slot and scale up</span></span>
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<td class="diff-line-num new new_line" data-linenumber="535" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0">+<span id="LC535" class="line"><span class="cm" style="color: #998; font-style: italic"> * the offet to be in bytes.</span></span>
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<pre style="margin: 0">+<span id="LC536" class="line"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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<pre style="margin: 0">+<span id="LC537" class="line"> <span class="n" style="color: #333">length</span> <span class="o" style="font-weight: bold">=</span> <span class="mi" style="color: #099">4</span> <span class="o" style="font-weight: bold">*</span> <span class="p">((</span><span class="n" style="color: #333">pc</span><span class="p">[</span><span class="mi" style="color: #099">1</span><span class="p">]</span> <span class="o" style="font-weight: bold">&</span> <span class="mh" style="color: #099">0x7FFFF</span><span class="p">)</span> <span class="o" style="font-weight: bold">-</span> <span class="mi" style="color: #099">1</span><span class="p">);</span></span>
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538
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<pre style="margin: 0"> <span id="LC538" class="line"></span>
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<pre style="margin: 0"> <span id="LC539" class="line"> <span class="k" style="font-weight: bold">while</span> <span class="p">(</span><span class="n" style="color: #333">string</span><span class="p">[</span><span class="n" style="color: #333">length</span> <span class="o" style="font-weight: bold">-</span> <span class="mi" style="color: #099">1</span><span class="p">]</span> <span class="o" style="font-weight: bold">==</span> <span class="sc" style="color: #d14">'\0'</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0"> <span id="LC540" class="line"> <span class="o" style="font-weight: bold">--</span><span class="n" style="color: #333">length</span><span class="p">;</span></span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -538,14 +545,14 @@ sigill_handler(HANDLER_ARGS)</td>
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<pre style="margin: 0"> <span id="LC545" class="line"><span class="cm" style="color: #998; font-style: italic"> * don't actually want to abort. We want to continue,</span></span>
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<pre style="margin: 0"> <span id="LC546" class="line"><span class="cm" style="color: #998; font-style: italic"> * but print out a useful message.</span></span>
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<pre style="margin: 0"> <span id="LC547" class="line"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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541
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<pre style="margin: 0">-<span id="LC541" class="line"> <span class="n" style="color: #333">printf</span><span class="p">(</span><span class="s" style="color: #d14">"NOT-IMPLEMENTED: %p: </span><span class="se" style="color: #d14">\"</span><span class="s" style="color: #d14">%.*s</span><span class="se" style="color: #d14">\"\n</span><span class="s" style="color: #d14">"</span><span class="p">,</span> <span class="n" style="color: #333">pc</span><span class="p">,</span> <span class="n" style="color: #333">length</span><span class="p">,</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: bold"><span class="idiff">char</span></span><span class="o" style="font-weight: bold"><span class="idiff">*</span></span><span class="p"><span class="idiff">)(</span></span><span class="n" style="color: #333"><span class="idiff">pc</span></span><span class="idiff"> </span><span class="o" style="font-weight: bold"><span class="idiff">+</span></span><span class="idiff"> </span><span class="mi" style="color: #099"><span class="idiff">2</span></span><span class="p"><span class="idiff right">)</span>);</span></span>
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<pre style="margin: 0">+<span id="LC548" class="line"> <span class="n" style="color: #333">printf</span><span class="p">(</span><span class="s" style="color: #d14">"NOT-IMPLEMENTED: %p: </span><span class="se" style="color: #d14">\"</span><span class="s" style="color: #d14">%.*s</span><span class="se" style="color: #d14">\"\n</span><span class="s" style="color: #d14">"</span><span class="p">,</span> <span class="n" style="color: #333">pc</span><span class="p">,</span> <span class="n" style="color: #333">length</span><span class="p">,</span> <span class="n" style="color: #333"><span class="idiff left right">string</span></span><span class="p">);</span></span>
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<pre style="margin: 0"> <span id="LC549" class="line"></span>
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<pre style="margin: 0"> <span id="LC550" class="line"> <span class="cm" style="color: #998; font-style: italic">/*</span></span>
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<pre style="margin: 0">-<span id="LC544" class="line"><span class="cm" style="color: #998; font-style: italic"> * Skip over the <span class="idiff left right">UDF</span> instruction so if we can</span></span>
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<pre style="margin: 0">+<span id="LC551" class="line"><span class="cm" style="color: #998; font-style: italic"> * Skip over the <span class="idiff left right">illtrap</span> instruction so if we can</span></span>
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<pre style="margin: 0"> <span id="LC552" class="line"><span class="cm" style="color: #998; font-style: italic"> * continue. This will execute the branch, skipping</span></span>
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<pre style="margin: 0"> <span id="LC553" class="line"><span class="cm" style="color: #998; font-style: italic"> * over the string too.</span></span>
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<pre style="margin: 0"> <span id="LC554" class="line"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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<pre style="margin: 0">-<span id="LC548" class="line"> <span class="n" style="color: #333">SC_PC</span><span class="p">(</span><span class="n" style="color: #333">context</span><span class="p">)</span> <span class="o" style="font-weight: bold">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: bold">unsigned</span> <span class="kt" style="color: #458; font-weight: bold">long</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333">pc</span> <span class="o" style="font-weight: bold">+</span> <span class="mi" style="color: #099">1</span><span class="p">);</span></span>
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<pre style="margin: 0">+<span id="LC555" class="line"> <span class="n" style="color: #333">SC_PC</span><span class="p">(</span><span class="n" style="color: #333"><span class="idiff left right">os_</span>context</span><span class="p">)</span> <span class="o" style="font-weight: bold">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: bold">unsigned</span> <span class="kt" style="color: #458; font-weight: bold">long</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333">pc</span> <span class="o" style="font-weight: bold">+</span> <span class="mi" style="color: #099">1</span><span class="p">);</span></span>
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<pre style="margin: 0"> <span id="LC556" class="line"> </span>
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<pre style="margin: 0"> <span id="LC557" class="line"> <span class="p">}</span></span>
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<pre style="margin: 0"> <span id="LC558" class="line"> <span class="k" style="font-weight: bold">break</span><span class="p">;</span></span>
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