Metacircular LC-3 implementation
This is a joke gone way too far. Unfortunately it allows you to run LC3 programs in a VM written in LC-3. I don't know of any practical uses for this.
The macro-assembler directory has the macro assembler, which roughly
brings up a LC-3 assembler (I tested with laser) to nasm-ish
standards. The vm directory has a VM implementation based on this
guide, specifically the C++
template part. However, as code density is important with LC-3 and its
tiny PC-relative ranges, we instead have each "part" be compiled exactly
once, with threaded "microcode" sequencing parts.
We also handle the problem of fitting one 64 kiloword memory space
into another with a simple virtual memory system, which pages into the
host only when a page is written to. There is also a translation
lookaside buffer with only one entry, which avoids calling ldb most
of the time.