[3.13] gh-125444: Fix illegal instruction for older Arm architectures (GH-125574) #125595
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…ythonGH-125574) On Arm v5 it is not possible to get the thread ID via c13 register hence the illegal instruction. The c13 register started to provide thread ID since Arm v6K architecture variant. Other variants of Arm v6 (T2, Z and base) don’t provide the thread ID via c13. For the sake of simplicity we group v5 and v6 together and consider that instructions for Arm v7 only. (cherry picked from commit feda9aa) Co-authored-by: Diego Russo <diego.russo@arm.com>
This was referenced Oct 16, 2024
colesbury
approved these changes
Oct 16, 2024
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On Arm v5 it is not possible to get the thread ID via c13 register
hence the illegal instruction. The c13 register started to provide
thread ID since Arm v6K architecture variant. Other variants of
Arm v6 (T2, Z and base) don’t provide the thread ID via c13.
For the sake of simplicity we group v5 and v6 together and
consider that instructions for Arm v7 only.
(cherry picked from commit feda9aa)
Co-authored-by: Diego Russo diego.russo@arm.com