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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>
</h3>
<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/b8498f43cd9fd407ff2dddf0209b0a4f25e6d200">b8498f43</a></strong>
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<span>by Raymond Toy</span>
<i>at 2021-05-21T19:52:05-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Flame out if single-stepping didn't move far enough
After single-stepping, we MUST be past the place where the breakpoint
instruction was inserted. If not, call lose to get to LDB.
</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/b8498f43cd9fd407ff2dddf0209b0a4f25e6d200#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">@@ -501,13 +501,20 @@ sigtrap_handler(HANDLER_ARGS)</td>
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<pre style="margin: 0;"> <span id="LC501" 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;">"* Maybe reinstall breakpoint for pc %p with single_stepping %p</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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502
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502
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="c"> <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="p">)</span> <span class="n" style="color: #333;">SC_PC</span><span class="p">(</span><span class="n" style="color: #333;">os_context</span><span class="p">),</span> <span class="n" style="color: #333;">single_stepping</span><span class="p">));</span></span>
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503
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="c"> </span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</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;">long</span><span class="p">)</span> <span class="n" style="color: #333;">SC_PC</span><span class="p">(</span><span class="n" style="color: #333;">os_context</span><span class="p">)</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;">long</span><span class="p">)</span> <span class="n" style="color: #333;">single_stepping</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC505" class="line" lang="c"> <span class="n" style="color: #333;">fprintf</span><span class="p">(</span><span class="n" style="color: #333;">stderr</span><span class="p">,</span> <span class="s" style="color: #d14;">"* Breakpoint not re-install</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="LC506" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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507
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="c"> <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;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">single_stepping</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC504" 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="LC505" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Lose if single-stepping didn't move us past where the</span></span>
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * breakpoint instruction was inserted.</span></span>
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<pre style="margin: 0;">+<span id="LC507" 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="LC508" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</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;">long</span><span class="p">)</span> <span class="n" style="color: #333;">SC_PC</span><span class="p">(</span><span class="n" style="color: #333;">os_context</span><span class="p">)</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;">long</span><span class="p">)</span> <span class="n" style="color: #333;">single_stepping</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="c"> <span class="n" style="color: #333;">lose</span><span class="p">(</span><span class="s" style="color: #d14;">"Single-stepping did not advance past the breakpoint at %p</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="LC510" class="line" lang="c"> <span class="n" style="color: #333;">single_stepping</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC509" 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;">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="LC510" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC513" 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="LC514" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Put back the breakpoint since we skipped over it.</span></span>
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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516
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="c"> <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;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">single_stepping</span><span class="p">;</span></span>
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517
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<pre style="margin: 0;">+<span id="LC517" 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;">BREAKPOINT_INST</span><span class="p">;</span> <span class="cm" style="color: #998; font-style: italic;">/* x86 INT3 */</span></span>
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518
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="c"> <span class="n" style="color: #333;">single_stepping</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span></span>
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513
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520
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span><span class="p">;</span></span>
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