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<h3>
Raymond Toy pushed to branch issue-97-define-ud2-inst
at <a href="https://gitlab.common-lisp.net/cmucl/cmucl">cmucl / cmucl</a>
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<h4>
Commits:
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<li>
<strong><a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/62d67c1ed634686a0bc1ac58c62dd290dd906766">62d67c1e</a></strong>
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<span>by Raymond Toy</span>
<i>at 2021-04-10T09:24:32-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More cleanups
When installing a breakpoint, we only need to save the single byte.
When removing a breakpoint, we only need to restore the single byte.
</pre>
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<h4>1 changed file:</h4>
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<a href="#83e1227b8996eac149e86a66562471511fe93ca7">
src/lisp/x86-arch.c
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<h4>Changes:</h4>
<li id="83e1227b8996eac149e86a66562471511fe93ca7">
<a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/62d67c1ed634686a0bc1ac58c62dd290dd906766#83e1227b8996eac149e86a66562471511fe93ca7"><strong>src/lisp/x86-arch.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">@@ -213,17 +213,21 @@ arch_set_pseudo_atomic_interrupted(os_context_t * context)</td>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="c"><span class="err" style="color: #a61717; background-color: #e3d2d2;"></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;"> * Installs a breakpoint (INT3) at |pc|. We return the byte that was</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;"> * replaced by the int3 instruction.</span></span>
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<pre style="margin: 0;">+<span id="LC219" 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="LC220" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">long</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">arch_install_breakpoint</span><span class="p">(</span><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;">pc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">char</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">ptr</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">pc</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC220" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">long</span> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ptr</span><span class="p"><span class="idiff left">[</span></span><span class="mi" style="color: #099;"><span class="idiff">0</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ptr</span></span><span class="p"><span class="idiff">[</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><<</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">8</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ptr</span></span><span class="p"><span class="idiff">[</span></span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><<</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">16</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ptr</span></span><span class="p"><span class="idiff">[</span></span><span class="mi" style="color: #099;"><span class="idiff">3</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><<</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">24</span></span><span class="p"><span class="idiff right">)</span>;</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">long</span> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">*</span></span><span class="n" style="color: #333;">ptr</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="c"> <span class="n" style="color: #333;">DPRINTF</span><span class="p">(</span><span class="n" style="color: #333;">debug_handlers</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="c"> <span class="p">(</span><span class="n" style="color: #333;">stderr</span><span class="p">,</span> <span class="s" style="color: #d14;">"arch_install_breakpoint at %p, old code = 0x%lx</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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<pre style="margin: 0;"> <span id="LC228" class="line" lang="c"> <span class="n" style="color: #333;">pc</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">));</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">char</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pc</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">BREAKPOINT_INST</span><span class="p">;</span> <span class="cm" style="color: #998; font-style: italic;">/* x86 INT3 */</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;"><span class="idiff left right">ptr</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">BREAKPOINT_INST</span><span class="p">;</span> <span class="cm" style="color: #998; font-style: italic;">/* x86 INT3 */</span></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">result</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="c"></span>
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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">@@ -235,14 +239,9 @@ arch_remove_breakpoint(void *pc, unsigned long orig_inst)</td>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="c"> <span class="n" style="color: #333;">pc</span><span class="p">,</span> <span class="n" style="color: #333;">orig_inst</span><span class="p">));</span></span>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">ptr</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">pc</span><span class="p">;</span></span>
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237
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<pre style="margin: 0;"> <span id="LC241" 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="LC238" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Just restore all the bytes from orig_inst. Should we just</span></span>
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<pre style="margin: 0;">-<span id="LC239" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * re-install just the one byte that was taken by the int3</span></span>
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * instruction?</span></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Just restore the byte from orig_inst.</span></span>
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<pre style="margin: 0;"> <span id="LC243" 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="LC244" class="line" lang="c"> <span class="n" style="color: #333;">ptr</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orig_inst</span> <span class="o" style="font-weight: 600;">&</span> <span class="mh" style="color: #099;">0xff</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="c"> <span class="n" style="color: #333;">ptr</span><span class="p">[</span><span class="mi" style="color: #099;">1</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">orig_inst</span> <span class="o" style="font-weight: 600;">>></span> <span class="mi" style="color: #099;">8</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&</span> <span class="mh" style="color: #099;">0xff</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC244" class="line" lang="c"> <span class="n" style="color: #333;">ptr</span><span class="p">[</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">orig_inst</span> <span class="o" style="font-weight: 600;">>></span> <span class="mi" style="color: #099;">16</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&</span> <span class="mh" style="color: #099;">0xff</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC245" class="line" lang="c"> <span class="n" style="color: #333;">ptr</span><span class="p">[</span><span class="mi" style="color: #099;">3</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">orig_inst</span> <span class="o" style="font-weight: 600;">>></span> <span class="mi" style="color: #099;">24</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&</span> <span class="mh" style="color: #099;">0xff</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="c"><span class="err" style="color: #a61717; background-color: #e3d2d2;"></span></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="c"></span>
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