improve gdbserver.py

[anjiahao1]

Summary

• Why change is necessary (fix, update, new feature)?
  These changes enhance gdbserver tool for improved debugging capabilities:

  • Fix unexpected thread values (fix)
  • Improve performance by using LIEF for symbol loading (update)
  • Add x86_64 architecture support (new feature)
  • Improve debugging with additional log information (update)
  • Fix compatibility with VSCode (fix)

• What functional part of code is being changed?
  tools/gdbserver/gdbserver.py

• How does the change exactly work (what will change and how)?

  • Fixed thread ID handling to ensure thread < 0 is set to 0
  • Replaced symbol loading mechanism to use LIEF inside pyelftools, significantly reducing load time for large ELF files
  • Added x86_64 architecture support to enable crash analysis for x86_64 targets
  • Added unpack_data logging for better debugging visibility
  • Fixed command parsing to work correctly with VSCode's debugger (c command should cut from [2:)

• Related NuttX Issue reference if applicable.
  N/A

• Related NuttX Apps Issue / Pull Request reference if applicable.
  N/A

Impact

• Is new feature added? Is existing feature changed? YES

  • Added x86_64 architecture support
  • Improved symbol loading performance
  • Enhanced debugging capabilities with additional logging

• Impact on user (will user need to adapt to change)? NO
  These are improvements to the gdbserver tool with backward compatibility maintained.

• Impact on build (will build process change)? NO
  No changes to the build process.

• Impact on hardware (will arch(s) / board(s) / driver(s) change)? NO
  This is a host-side debugging tool enhancement.

• Impact on documentation (is update required / provided)? NO
  Tool documentation update not required for these internal improvements.

• Impact on security (any sort of implications)? NO

• Impact on compatibility (backward/forward/interoperability)? YES
  Improved VSCode compatibility through command parsing fix.

• Anything else to consider or add?
  The performance improvement is significant: symbol loading time reduced from 32s to 2s for a 273MB ELF file.

Testing

I confirm that changes are verified on local setup and works as intended:

• Build Host(s): Linux, x86_64
• Target(s): N/A (host-side debugging tool)
• Tested x86_64 symbol loading on a 273MB ELF file with significant performance improvement (32s → 2s)
• Verified thread ID handling fix prevents unexpected values
• Verified VSCode compatibility improvements

Testing logs after change:

Example test with 273MB ELF file:
Before: Symbol loading took 32 seconds
After:  Symbol loading took 2 seconds using LIEF

Thread ID handling:
Confirmed thread < 0 is properly set to 0

VSCode compatibility:
Confirmed c command parsing works correctly with VSCode debugger

PR verification Self-Check

• This PR introduces only one functional change.
• I have updated all required description fields above.
• My PR adheres to Contributing Guidelines and Documentation (git commit title and message, coding standard, etc).
• My PR is still work in progress (not ready for review).
• My PR is ready for review and can be safely merged into a codebase.

[xiaoxiang781216]

please ignore the false spellcheck:

/home/runner/work/nuttx/nuttx/nuttx/tools/gdbserver.py:36: lief ==> leaf, life
/home/runner/work/nuttx/nuttx/nuttx/tools/gdbserver.py:38: lief ==> leaf, life
/home/runner/work/nuttx/nuttx/nuttx/tools/gdbserver.py:38: lief ==> leaf, life
/home/runner/work/nuttx/nuttx/nuttx/tools/gdbserver.py:332: lief ==> leaf, life
/home/runner/work/nuttx/nuttx/nuttx/tools/gdbserver.py:334: lief ==> leaf, life
/home/runner/work/nuttx/nuttx/nuttx/tools/gdbserver.py:346: lief ==> leaf, life
/home/runner/work/nuttx/nuttx/nuttx/tools/gdbserver.py:538: lief ==> leaf, life
/home/runner/work/nuttx/nuttx/nuttx/tools/gdbserver.py:540: lief ==> leaf, life