1482e5662d | ||
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.clang-format | ||
.gitignore | ||
LICENSE | ||
README.md | ||
build.sh | ||
example.usm | ||
uxn.c | ||
uxnasm.c |
README.md
Uxn
A stack-based VM, written in ANSI C.
Build
cc uxn.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -o uxn
Assembly Syntax
:label
, a named offset+literal
, a numeric value.pointer
, pointer to a label
< comment >
+01 < literal >
[ 01 02 03 04 ] < block of literals >
$01 < pointer8 >
{ 01 02 03 04 } < block of pointer8 >
~ff0f < pointer16 >
( ff00 ff01 ff02 ff03 ) < block of pointer16 >
=const +ff
:label ADD RTS
TODOs
- Implement addressing
- Implement 16 bits operations
- Jumps should be relative
- Catch overflow/underflow
- Implement literals like
[2]
, and[ 2 3 ]
. - Audo-detect literals length.
- SDL Layer Emulator
- Build PPU
Refs
https://code.9front.org/hg/plan9front/file/a7f9946e238f/sys/src/games/nes/cpu.c http://www.w3group.de/stable_glossar.html http://www.emulator101.com/6502-addressing-modes.html http://forth.works/8f0c04f616b6c34496eb2141785b4454 https://justinmeiners.github.io/lc3-vm/