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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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<li>
<strong><a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/cfb35624edee9113a81d900066dc2a9d70e7117c">cfb35624</a></strong>
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<span>by Raymond Toy</span>
<i>at 2021-04-09T16:14:44-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modify UD1 inst so it prints out registers correctly
Hack the definition of the ud1 instruction format so that the reg/mem
field is really a word register. This then makes the pending
interrupt trap print out as "ud1 ecx, ecx" instead of "ud1 ecx, cl".
I don't know why the printer wanted to print cl, but `print-reg` was
passing `:byte` as the size (from the dstate `'width`).
This works around the issue.
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<h4>1 changed file:</h4>
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<a href="#2a6bca7a142015890af48e53d45089058f833609">
src/compiler/x86/insts.lisp
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<h4>Changes:</h4>
<li id="2a6bca7a142015890af48e53d45089058f833609">
<a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/cfb35624edee9113a81d900066dc2a9d70e7117c#2a6bca7a142015890af48e53d45089058f833609"><strong>src/compiler/x86/insts.lisp</strong></a>
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<pre style="margin: 0;"> <span id="LC2062" class="line" lang="common_lisp"> <span class="p">(</span><span class="nv" style="color: #008080;">code</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;">8</span><span class="p">)))</span></span>
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<pre style="margin: 0;"> <span id="LC2063" class="line" lang="common_lisp"></span>
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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 reg. Using just</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;">;; reg/mem, the register sometimes printed out as a byte reg and I</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;">;; (toy.raymond) don't know why.</span></span>
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<pre style="margin: 0;"> <span id="LC2070" 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="LC2071" 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="LC2072" 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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2073
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<pre style="margin: 0;"> <span id="LC2073" class="line" lang="common_lisp"> <span class="p">(</span><span class="nv" style="color: #008080;">op</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;">8</span><span class="p">)</span> <span class="ss" style="color: #990073;">:value</span> <span class="m" style="color: #099;">#b10111001</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2069" class="line" lang="common_lisp"> <span class="p">(</span><span class="nv" style="color: #008080;">reg/mem</span> <span class="ss" style="color: #990073;">:fields</span> <span class="p">(</span><span class="nb" style="color: #0086b3;">list</span> <span class="p">(</span><span class="nb" style="color: #0086b3;">byte</span> <span class="mi" style="color: #099;">2</span> <span class="mi" style="color: #099;">22</span><span class="p">)</span> <span class="p">(</span><span class="nb" style="color: #0086b3;">byte</span> <span class="mi" style="color: #099;">3</span> <span class="mi" style="color: #099;">16</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC2070" class="line" lang="common_lisp"> <span class="ss" style="color: #990073;">:type</span> <span class="ss" style="color: #990073;">'reg/mem</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2071" class="line" lang="common_lisp"> <span class="p">(</span><span class="nv" style="color: #008080;">reg</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;">3</span> <span class="mi" style="color: #099;">19</span><span class="p">)</span> <span class="ss" style="color: #990073;">:type</span> <span class="ss" style="color: #990073;">'word-reg</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC2074" class="line" lang="common_lisp"> <span class="c1" style="color: #998; font-style: italic;">;; The mod bits ensure that the reg/mem field is interpreted as a</span></span>
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<pre style="margin: 0;">+<span id="LC2075" class="line" lang="common_lisp"> <span class="c1" style="color: #998; font-style: italic;">;; register, not memory.</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;">reg/mem</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;">3</span> <span class="mi" style="color: #099;">16</span><span class="p">)</span> <span class="ss" style="color: #990073;">:type</span> <span class="ss" style="color: #990073;">'word-reg</span><span class="p">)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2077" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2077
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<pre style="margin: 0;">+<span id="LC2077" class="line" lang="common_lisp"> <span class="p">(</span><span class="nv" style="color: #008080;">reg</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;">3</span> <span class="mi" style="color: #099;">19</span><span class="p">)</span> <span class="ss" style="color: #990073;">:type</span> <span class="ss" style="color: #990073;">'word-reg</span><span class="p">)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="2078" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2078
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<pre style="margin: 0;">+<span id="LC2078" class="line" lang="common_lisp"> <span class="p">(</span><span class="nb" style="color: #0086b3;">mod</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;">2</span> <span class="mi" style="color: #099;">22</span><span class="p">)</span> <span class="ss" style="color: #990073;">:value</span> <span class="m" style="color: #099;">#b11</span><span class="p">))</span></span>
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2072
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<td class="new_line diff-line-num" data-linenumber="2079" 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">
2079
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<pre style="margin: 0;"> <span id="LC2079" class="line" lang="common_lisp"></span>
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2073
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<td class="new_line diff-line-num" data-linenumber="2080" 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">
2080
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<pre style="margin: 0;"> <span id="LC2080" class="line" lang="common_lisp"><span class="p">(</span><span class="nb" style="color: #0086b3;">defun</span> <span class="nv" style="color: #008080;">snarf-error-junk</span> <span class="p">(</span><span class="nv" style="color: #008080;">sap</span> <span class="nv" style="color: #008080;">offset</span> <span class="k" style="font-weight: 600;">&optional</span> <span class="nv" style="color: #008080;">length-only</span><span class="p">)</span></span>
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<td class="old_line diff-line-num" data-linenumber="2074" 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">
2074
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<td class="new_line diff-line-num" data-linenumber="2081" 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">
2081
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<pre style="margin: 0;"> <span id="LC2081" class="line" lang="common_lisp"> <span class="p">(</span><span class="k" style="font-weight: 600;">let*</span> <span class="p">((</span><span class="nb" style="color: #0086b3;">length</span> <span class="p">(</span><span class="nv" style="color: #008080;">system:sap-ref-8</span> <span class="nv" style="color: #008080;">sap</span> <span class="nv" style="color: #008080;">offset</span><span class="p">))</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2125" 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="diff-line-num unfold js-unfold new_line" data-linenumber="2132" 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">@@ -2125,7 +2132,7 @@</td>
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2125
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2132
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<pre style="margin: 0;"> <span id="LC2132" class="line" lang="common_lisp"><span class="c1" style="color: #998; font-style: italic;">;; We just want the trap code in the third byte of the instruction.</span></span>
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<td class="old_line diff-line-num" data-linenumber="2126" 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">
2126
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<td class="new_line diff-line-num" data-linenumber="2133" 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">
2133
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<pre style="margin: 0;"> <span id="LC2133" class="line" lang="common_lisp"><span class="p">(</span><span class="nv" style="color: #008080;">define-instruction</span> <span class="nv" style="color: #008080;">ud1</span> <span class="p">(</span><span class="nv" style="color: #008080;">segment</span> <span class="nv" style="color: #008080;">code</span><span class="p">)</span></span>
</pre>
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2127
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<td class="new_line diff-line-num" data-linenumber="2134" 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">
2134
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<pre style="margin: 0;"> <span id="LC2134" class="line" lang="common_lisp"> <span class="p">(</span><span class="ss" style="color: #990073;">:declare</span> <span class="p">(</span><span class="k" style="font-weight: 600;">type</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">unsigned-byte</span> <span class="mi" style="color: #099;">8</span><span class="p">)</span> <span class="nv" style="color: #008080;">code</span><span class="p">))</span></span>
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2128
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<td class="new_line diff-line-num old" data-linenumber="2135" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2128" class="line" lang="common_lisp"> <span class="p">(</span><span class="ss" style="color: #990073;">:printer</span> <span class="nv" style="color: #008080;">ud1</span> <span class="p">((</span><span class="nv" style="color: #008080;">op</span> <span class="m" style="color: #099;">#b10111001</span><span class="p">))</span></span>
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2135
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<pre style="margin: 0;">+<span id="LC2135" class="line" lang="common_lisp"> <span class="p">(</span><span class="ss" style="color: #990073;">:printer</span> <span class="nv" style="color: #008080;">ud1</span> <span class="p">((</span><span class="nv" style="color: #008080;">op</span> <span class="m" style="color: #099;">#b10111001</span><span class="p">)</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="nv" style="color: #008080;"><span class="idiff">reg</span></span><span class="idiff"> </span><span class="no" style="color: #008080;"><span class="idiff">nil</span></span><span class="idiff"> </span><span class="ss" style="color: #990073;"><span class="idiff">:type</span></span><span class="idiff"> </span><span class="ss" style="color: #990073;"><span class="idiff">'word-reg</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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2129
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<td class="new_line diff-line-num" data-linenumber="2136" 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">
2136
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<pre style="margin: 0;"> <span id="LC2136" class="line" lang="common_lisp"> <span class="ss" style="color: #990073;">:default</span></span>
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2130
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2137
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<pre style="margin: 0;"> <span id="LC2137" class="line" lang="common_lisp"> <span class="ss" style="color: #990073;">:control</span> <span class="nf" style="color: #900; font-weight: 600;">#'</span><span class="nv" style="color: #008080;">ud1-control</span><span class="p">)</span></span>
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2131
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<td class="new_line diff-line-num" data-linenumber="2138" 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">
2138
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<pre style="margin: 0;"> <span id="LC2138" class="line" lang="common_lisp"> <span class="p">(</span><span class="ss" style="color: #990073;">:emitter</span></span>
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