RTEMS | cpukit/score/cpu/mips: An interrupt handler cannot access thread-local objects (#5795)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5795



The interrupt handlers run with the exception level set in the status register.  An access to a thread-local object executes `rdhwr`, which raises the reserved instruction exception on processors without this instruction.  With the exception level set, the processor does not update the exception program counter.  The emulation of `rdhwr` then finds another instruction and the exception becomes fatal.

On `mips/malta`, `psxmsgq03` and `spintrcritical24` fail in this way, because their interrupt handlers set `errno`.  A Newlib built with `--enable-newlib-reent-thread-local` keeps `errno` in thread-local storage.

Found while running the full test suite on Qemu.  This description was created with Claude Code assistance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5795
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