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As part of the RISC-V ABI, the gp register is expected to initialized with the address of __global_pointer$ as early as possible. This allows loads and stores from .sdata to be relaxed based on the value of gp. In locore.S we do this initialization twice, once each for va and mpva. However, in both cases the initialization is preceded by an la instruction, which in theory could be relaxed by the linker. Move the initialization of gp to be slightly earlier (before la cpu_exception_handler), and add an additional gp initialization at the very beginning of _start, before virtual memory is set up. Reported by: jrtc27 Reviewed by: jrtc27 Differential Revision: https://reviews.freebsd.org/D23139
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