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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - debugserver: ignores P packets when setting AVX-2 and AVX-512 registers"
href="https://bugs.llvm.org/show_bug.cgi?id=52362">52362</a>
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<th>Summary</th>
<td>debugserver: ignores P packets when setting AVX-2 and AVX-512 registers
</td>
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<th>Product</th>
<td>lldb
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
</td>
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<th>Reporter</th>
<td>alessandro.arzilli@gmail.com
</td>
</tr>
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<th>CC</th>
<td>jdevlieghere@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Sending a P packet to debugserver to change the value of a AVX-2 or AVX-512
register will appear to work:
request:
$P5b=cdcccccccccc0840000000000000000000000000000000000000000000000000;thread:39d025;#24
response: $OK#00
but the new register value will not be written to the target process.
This happens because DNBArchImplX86_64::SetRegisterValue at line 2635:
<a href="https://github.com/llvm/llvm-project/blob/2c4a9e830cbb3b91a57902f7ecd508c544701819/lldb/tools/debugserver/source/MacOSX/x86_64/DNBArchImplX86_64.cpp#L2635">https://github.com/llvm/llvm-project/blob/2c4a9e830cbb3b91a57902f7ecd508c544701819/lldb/tools/debugserver/source/MacOSX/x86_64/DNBArchImplX86_64.cpp#L2635</a>
returns directly instead of setting success to true and allowing the call to
SetRegisterState to happen.</pre>
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