RTEMS | cpukit/libdebugger: Add support for TLS variables (!517)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/517

Project:Branches: opticron/rtems:brmain-add-tls-debug-support to rtems/rtos/rtems:main
Author:   Kinsey Moore
Assignee: Kinsey Moore



## Summary

cpukit/libdebugger: Add support for TLS variables

This adds support for the "vGetTLSAddr" GDB query which retrieves the
address of a TLS variable by offset from the beginning of the TLS memory
space for the given thread. This offset does not include the size of the
thread control block which is at the beginning of every TLS area as used
by RTEMS. Notably, the returned address is big-endian rather than the
little-endian typical with other responses.

This functionality does not include retrieval of addresses for TLS
variables hosted in loadable modules, only TLS variables in the host
binary.

This has been tested on AArch64 libdebugger, but requires a modified GDB to even issue the query as far as I could get things to work. I'll be adding a patch to GDB in the near-term to enable this functionality and longer term we'd need to setup proper profiles in GDB for RTEMS so that this support is available.
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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/517
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