[lldb-dev] [Bug 52362] New: debugserver: ignores P packets when setting AVX-2 and AVX-512 registers

[via lldb-dev]

https://bugs.llvm.org/show_bug.cgi?id=52362

            Bug ID: 52362
           Summary: debugserver: ignores P packets when setting AVX-2 and
                    AVX-512 registers
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: alessandro.arzilli at gmail.com
                CC: jdevlieghere at apple.com, llvm-bugs at lists.llvm.org

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:

https://github.com/llvm/llvm-project/blob/2c4a9e830cbb3b91a57902f7ecd508c544701819/lldb/tools/debugserver/source/MacOSX/x86_64/DNBArchImplX86_64.cpp#L2635

returns directly instead of setting success to true and allowing the call to
SetRegisterState to happen.

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