Space VM

I wanna die...

--- "I can't be the only one, baby", Space Dandy

Space VM, it is a virtual machine in Space. Space VM is characterised with these features:

• register based
• codes and datum are stored in the same memory

Goals

• Understand programming languages
• Understand basics of computer architecture

Tools

• assembler (Common Lisp)
• virtual machine (Common Lisp)

Simple usage

Run in shell:

$ ros install t-sin/svm
$ ros run
* (ql:quickload :svm)
* (multiple-value-bind (vm p)
      (svm:init-vm #P"s/sample.s")
    (declare (ignore p))
    (let ((svm-vm/vm/run::*print-op* t)
          (svm-vm/vm/run::*print-register* t)
          (svm-vm/vm/run::*print-memory* nil))
      (svm:run-program vm)))

or run in REPL:

CL-USER> (ql:quickload :svm)
CL-USER> (multiple-value-bind (vm p)
             (svm:init-vm "
.code
hw
exit")
           (declare (ignore p))
           (let ((svm-vm/vm/run::*print-op* t)
                 (svm-vm/vm/run::*print-register* t)
                 (svm-vm/vm/run::*print-memory* nil))
             (svm:run-program vm)))

About VM

• memory format -> see vm/README.md
• instructions -> see instruction.lisp

Registers

• pc: program counter
• r0 ~ r6: general purpus register

Data types

• byte
• bytes
• UTF-8 characters
• UTF-8 character strings