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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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<ul>
<li>
<strong><a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/5ad119295e582f11d709a28a0187776653d61db0">5ad11929</a></strong>
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<span>by Raymond Toy</span>
<i>at 2021-04-13T22:16:26-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up comment and impl
In the description of the ud1 format, mention why we can't use
ext-reg-reg/mem even though it looks very much like what the ud1
format is.
In x86-arch.c, fix typo in arch_install_breakpoint that was setting
the result incorrectly (and caused a compiler warning).
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<h4>2 changed files:</h4>
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<li class="file-stats">
<a href="#2a6bca7a142015890af48e53d45089058f833609">
src/compiler/x86/insts.lisp
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<li class="file-stats">
<a href="#83e1227b8996eac149e86a66562471511fe93ca7">
src/lisp/x86-arch.c
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<h4>Changes:</h4>
<li id="2a6bca7a142015890af48e53d45089058f833609">
<a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/5ad119295e582f11d709a28a0187776653d61db0#2a6bca7a142015890af48e53d45089058f833609"><strong>src/compiler/x86/insts.lisp</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">@@ -2064,9 +2064,13 @@</td>
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<pre style="margin: 0;"> <span id="LC2064" class="line" lang="common_lisp"></span>
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<pre style="margin: 0;"> <span id="LC2065" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; The UD1 instruction. The mod bits of the mod r/m byte MUST be #b11</span></span>
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<pre style="margin: 0;"> <span id="LC2066" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; so that the reg/mem field is actually a register. This is a hack</span></span>
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<pre style="margin: 0;">-<span id="LC2067" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; to allow us to print out the reg/mem reg as a 32-bit reg. Using</span></span>
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<pre style="margin: 0;">-<span id="LC2068" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; just reg/mem, the register sometimes printed out as a byte reg and</span></span>
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<pre style="margin: 0;">-<span id="LC2069" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; I (toy.raymond) don't know why.</span></span>
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<pre style="margin: 0;">+<span id="LC2067" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; to allow us to print out the reg/mem reg as a 32-bit reg.</span></span>
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<pre style="margin: 0;">+<span id="LC2068" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;;</span></span>
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<pre style="margin: 0;">+<span id="LC2069" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; While the instruction looks like an ext-reg-reg/mem format with</span></span>
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<pre style="margin: 0;">+<span id="LC2070" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; fixed width value of 1, it isn't because we need to disassemble the</span></span>
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<pre style="margin: 0;">+<span id="LC2071" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; reg/mem field as a 32-bit reg. ext-reg-reg/mem needs a width prefix</span></span>
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<pre style="margin: 0;">+<span id="LC2072" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; byte to specify that, and we definitely don't want that. Hence,</span></span>
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<pre style="margin: 0;">+<span id="LC2073" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; use a special instruction format for the UD1 instruction.</span></span>
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<pre style="margin: 0;"> <span id="LC2074" class="line" lang="common_lisp"><span class="p">(</span><span class="nv" style="color: #008080;">disassem:define-instruction-format</span></span>
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<pre style="margin: 0;"> <span id="LC2075" class="line" lang="common_lisp"> <span class="p">(</span><span class="nv" style="color: #008080;">ud1</span> <span class="mi" style="color: #099;">24</span> <span class="ss" style="color: #990073;">:default-printer</span> <span class="o" style="font-weight: 600;">'</span><span class="p">(</span><span class="ss" style="color: #990073;">:name</span> <span class="ss" style="color: #990073;">:tab</span> <span class="nv" style="color: #008080;">reg</span> <span class="s" style="color: #d14;">", "</span> <span class="nv" style="color: #008080;">reg/mem</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2076" class="line" lang="common_lisp"> <span class="p">(</span><span class="nv" style="color: #008080;">prefix</span> <span class="ss" style="color: #990073;">:field</span> <span class="p">(</span><span class="nb" style="color: #0086b3;">byte</span> <span class="mi" style="color: #099;">8</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="ss" style="color: #990073;">:value</span> <span class="m" style="color: #099;">#b00001111</span><span class="p">)</span></span>
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<a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/5ad119295e582f11d709a28a0187776653d61db0#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">@@ -220,13 +220,13 @@ arch_set_pseudo_atomic_interrupted(os_context_t * context)</td>
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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;">long</span> <span class="n" style="color: #333;">result</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="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;">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><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="LC224" class="line" lang="c"> <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="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">BREAKPOINT_INST</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="LC229" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="c"> <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="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">BREAKPOINT_INST</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC230" 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="LC231" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="c"></span>
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