Add float_read, float_write for fp registers
test/lib.h

Implement open/close dcload syscalls, change permission flag to "unsafe"
src/dcload.c
src/main.c
src/syscall.h

Add alignment checks
src/sh4/sh4core.c

Add test for modifier context change in middle of vertex list
test/testta5.data

Add more bad_input calls
Start adding the no-list handling (not finished)
src/pvr2/tacore.c

Update error tests
test/testta5.data

Add some more clip tests
test/testta6.data

First pass at implementing the tile clip. Reasonably accurate wrt basic
understanding of how its supposed to work, not so accurate wrt actual
hardware behaviour
src/pvr2/tacore.c

Fix broken tests
Add more NaN tests
test/testta5.data

Verify that bit 23 doesn't preserve other bits
test/testta.data