libretroadmin 80c1251d80 SPR: the scratchpad DMA channels in C89 ...

SPR.cpp becomes C. Hw.cpp's MFIFO entry points and vucpu_execute_block
get C linkage, THREAD_VU1 is asked through emu_config_thread_vu1(), and
VU.h and VUmicro.h lose their // comments, which a C89 lane read into
vu1RunCycles.

Copies between the scratchpad and memory now stay inside what they
address: a run past the end of main RAM reads on from the zero source,
one through VU0's 4 KiB windows mirrors instead of running into VU1, the
scratchpad's own window wraps, the scratchpad copied onto itself goes
front to back, interleave transfers to or from a bus error no longer
copy through NULL, and a source-chain tag at a bus error raises BEIS and
stops the channel instead of being read through NULL. tests/eespr replays
both channels against the transcript the C++ made and checks each of
these.

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..

build.sh

SPR: the scratchpad DMA channels in C89

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expected.txt

SPR: the scratchpad DMA channels in C89

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main.cpp

SPR: the scratchpad DMA channels in C89

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