Without this, qemu-system-ppc spins the host cpu until I close its
window. I assume the default G3 emulation. The emulator yields the
host cpu if I set certain flags in hid0 then msr. The hid0 flag can
be any of DOZE, NAP, SLEEP, so I just set all 3. I encode mfmsr and
mtmsr with .data4, because our assembler doesn't know instructions for
supervisor mode.
Also move some common symbols from .rom to .bss. Our assembler puts
common symbols in any section.
Also clean up the file. Delete a comment about linuxppc that is wrong
here. Delete redundant .extern because .define is the same.
was nearly useless; lots of fixes to qemuppc and pc86 sbrk(), which was broken;
change the pc86 console to echo output to the serial port (needed for running
tests on qemu).
standard library, because they never worked and come from an achingly old
version of the Pascal specification. Fix the implementations of New() and
Dispose() to use the standard C memory allocator rather than rolling their own
(also in C). Write test!
corresponding invocation in the ncg table so the same helpers can be used for
both mcg and ncg. Add a new IR opcode, FARJUMP, which jumps to a helper
function but saves volatile registers.
