#0: Use absolute addressing in startup

[nathan-TT]

Ticket

NA

Problem description

More execute-in-place investigation. The la assembler macro gets expanded to an auipc/addi pc-relative pair. We do not want pc-relative addressing of non-text segment symbols

What's changed

Use explicit lui/addi pairs. These will be relaxed by the linker to a gp-relative addi reg,gp,$N instruction, where possible.

Checklist

• [ YES] Post commit CI passes
• Blackhole Post commit (if applicable)
• Model regression CI testing passes (if applicable)
• Device performance regression CI testing passes (if applicable)
• New/Existing tests provide coverage for changes

[pgkeller]

nice