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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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<strong><a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/5ceb821e0427a3703f45b990d8953efbea6cbcb1">5ceb821e</a></strong>
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<span>by Raymond Toy</span>
<i>at 2021-05-21T20:14:22-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update comments.
Move the function comment for arch_skip_instruction to arch.h, and
correct an old comment.
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<h4>2 changed files:</h4>
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<a href="#1b75f3b90265bd374dd14aabcd10d4cfd74c3482">
src/lisp/arch.h
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<a href="#83e1227b8996eac149e86a66562471511fe93ca7">
src/lisp/x86-arch.c
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<h4>Changes:</h4>
<li id="1b75f3b90265bd374dd14aabcd10d4cfd74c3482">
<a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/5ceb821e0427a3703f45b990d8953efbea6cbcb1#1b75f3b90265bd374dd14aabcd10d4cfd74c3482"><strong>src/lisp/arch.h</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">@@ -13,7 +13,14 @@</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="nf" style="color: #900; font-weight: 600;">arch_init</span><span class="p">(</span><span class="n" style="color: #333;">fpu_mode_t</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC16" 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="LC17" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Skip over the trap instructions for an error trap and also skip</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * over anly following bytes used to encode information for an</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * error-trap or cerror-trap. The PC in the context is set to address</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * just past the trap instruction and data bytes (if any).</span></span>
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<pre style="margin: 0;">+<span id="LC21" 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="LC22" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">arch_skip_instruction</span><span class="p">(</span><span class="n" style="color: #333;">os_context_t</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">scp</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="n" style="color: #333;">boolean</span> <span class="nf" style="color: #900; font-weight: 600;">arch_pseudo_atomic_atomic</span><span class="p">(</span><span class="n" style="color: #333;">os_context_t</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">scp</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">arch_set_pseudo_atomic_interrupted</span><span class="p">(</span><span class="n" style="color: #333;">os_context_t</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">scp</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="n" style="color: #333;">os_vm_address_t</span> <span class="nf" style="color: #900; font-weight: 600;">arch_get_bad_addr</span><span class="p">(</span><span class="n" style="color: #333;">HANDLER_ARGS</span><span class="p">);</span></span>
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<a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/5ceb821e0427a3703f45b990d8953efbea6cbcb1#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">@@ -141,12 +141,9 @@ arch_init(fpu_mode_t mode)</td>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC143" 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="LC144" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Assuming we get here via an INT3 xxx instruction, the PC now</span></span>
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<pre style="margin: 0;">-<span id="LC145" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * points to the interrupt code (lisp value) so we just move past</span></span>
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<pre style="margin: 0;">-<span id="LC146" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * it. Skip the code, then if the code is an error-trap or</span></span>
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Cerror-trap then skip the data bytes that follow.</span></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Skip the UD1 instruction, and any data bytes associated with the</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * trap.</span></span>
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<pre style="margin: 0;"> <span id="LC146" 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="LC149" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">arch_skip_instruction</span><span class="p">(</span><span class="n" style="color: #333;">os_context_t</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">context</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="c"><span class="p">{</span></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">@@ -155,7 +152,7 @@ arch_skip_instruction(os_context_t * context)</td>
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<pre style="margin: 0;"> <span id="LC152" 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="LC153" 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_skip_inst at %lx>]</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;">SC_PC</span><span class="p">(</span><span class="n" style="color: #333;">context</span><span class="p">)));</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Get <span class="idiff left right">and skip the lisp error code.</span> */</span></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Get <span class="idiff left right">the address of the beginning of the UD1 instruction</span> */</span></span>
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<pre style="margin: 0;"> <span id="LC156" 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;">pc</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;">SC_PC</span><span class="p">(</span><span class="n" style="color: #333;">context</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="c"> </span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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