RTEMS | cpukit/libdl/arm: Obey instruction encoding requirements for Thumb BLX (!223)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/223

Project:Branches: opticron/rtems:libdl-thumb-blx to rtems/rtos/rtems:main
Author:   Kinsey Moore
Assignee: Kinsey Moore



## Summary

cpukit/libdl/arm: Obey instruction encoding requirements for Thumb BLX

Calls from Thumb code into ARM code require the use of a BLX instruction
and an optional offset prefix instruction. The BLX instruction encoding
requires that the least significant bit be 0 in all cases while the BL
instruction for Thumb-to-Thumb calls includes that bit as part of the
offset. This ensures that bit 0 of the BLX is set to 0 as required by
the instruction encoding specification.


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