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Commit Graph

9 Commits

Author SHA1 Message Date
Virgil Dupras
78d4d15fcf cvm: implement stack overflow error condition 2020-08-07 21:57:25 -04:00
Virgil Dupras
25f4312523 cvm: improve comments
They were a bit terse.
2020-08-07 21:03:28 -04:00
Virgil Dupras
a7dcb522c2 Make br cells 1 byte wide
The 1 byte limitation has been effective for a while now, but I
hadn't made the move yet, I wanted to see if the limitation would
cause me problems. It doesn't.

Doing this now slightly facilitates the IY->BC move in z80.

Bootstrapping: if you try to recreate the CVM binary from the
previous commit with this code, you'll have bootstrapping problems.
The first bootstrap will compile a binary with 2-bytes wide cells
but branching conditionals that yields 1-byte cells. That's bad.

I got around the issue by temporarily inserting a "397 399 LOADR"
instruction in cvm/xcomp.fs, right before the xcomp overrides. This
way, I force 1-byte cells everywhere on the first compiliation,
which then allows me to apply the logic change in cvm/vm.c and have
a properly running binary.
2020-07-06 07:27:50 -04:00
Virgil Dupras
5705cd5c31 Extract EXIT code from stable ABI zone 2020-07-05 13:41:12 -04:00
Virgil Dupras
5a2612a9c5 Add HERESTART xcomp config 2020-06-28 19:45:28 -04:00
Virgil Dupras
8a7fa77163 cvm: bootstraps itself! 2020-06-26 18:58:02 -04:00
Virgil Dupras
fc3919863f cvm: implement stack underflow errors 2020-06-26 17:55:10 -04:00
Virgil Dupras
9021e5f6e0 cvm: fix does 2020-06-26 17:35:21 -04:00
Virgil Dupras
36cb1389e6 Add a C implementation of native words
This will soon replace the libz80 based "forth" and
"stage" executables. This is much, much faster.
2020-06-26 15:50:13 -04:00