RTEMS | cpukit/libdl: No thread-local relocations on i386, microblaze and mips (#5796)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5796



A Newlib built with `--enable-newlib-reent-thread-local` keeps `errno` in thread-local storage.  An object which accesses `errno` carries thread-local relocations.  libdl supports none of them on i386, microblaze and mips, so the load of such an object fails and `dl11` fails on these architectures.

The value of a thread-local symbol of the base image is its offset from the thread pointer.  The relocations `R_386_TLS_LE`, `R_MICROBLAZE_TLSDTPREL64`, `R_MIPS_TLS_TPREL_HI16` and `R_MIPS_TLS_TPREL_LO16` can apply this offset.  `R_MICROBLAZE_TLSLD` needs no value, because `__tls_get_addr()` ignores its argument.

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

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5796
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