RTEMS | cpukit/libdl: The RAP loader reads a wrong relocation type (#5801)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5801



A relocation record of a RAP file holds the ELF relocation type in bits 7:0 of its info word.  The loader extracts it with `ELF_R_TYPE()`.  On a 64-bit target this macro returns the low 32 bits, which include the section index or the string offset in bits 30:8.  The RISC-V loader thus rejects `dl06` with "Unsupported relocation type 279".

The AArch64 relocation types start at 257 and do not fit into bits 7:0 at all.  The format needs a field of its own for the type, see also #4781.

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

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5801
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