jngumy / virtual-machine-tanembaum-architecture

A 16-bit virtual machine replicating the Tanembaum's famous architecture to write programs in assemby language. Made in C language.

Virtual Machine - Assembly translator (Tanembaum Architecture)

This was a project for my University's Architecture of Computers subject developed in 2018 by Lucia G., Ezequiel W and me. It's a 16-bit virtual machine (replicating the Tanembaum's famous architecture. The system can :

• read a program written in assembly (.asm files)
• translate it to machine code (for Tanembaum virtual architecture)
• simulate the execution.

Architecture description:

This virtual machine has the following components:

• RAM Memory of 2000 cells of 2 bytes each
• 6 general use registers: AX, BX, CX, DX, EX, FX
• 1 Program Counter register : IP
• 1 Condition register: CC
• 1 Data Segment register: DS
• 1 Stack Segment register: SS (3999 - StackSIZE + 1)
• 1 Stack Pointer register : SP
• 1 Base Pointer register: BP

Assembly instructions supported:

• MOV
• PUSH, POP (for the stack)
• CALL
• RET
• ADD, SUB, MUL, DIV
• MOD
• CMP
• SMOV, SCMP, SLEN (for strings comparisons)
• AND, OR, XOR, NOT
• LSHITF, RSHIFT
• SWAP
• RNDM
• JMP
• JE
• JG
• JL
• JZ
• JP
• JN
• JNZ
• SYS
• STOP

It also supports custom labes with the EQU instruction, for example

CUSTOM_LABEL EQU 0032
   ...
CUSTOM_LABEL: ADD[1000], 1

For comment lines, use *

Usage

virtual-machine-architecture.exe [-op] [code.asm] [machine.img] [inputs.dat] [output.txt]

where

- [op] is the operation ( <<T>> translate, <<X>> execute and <<A>> translate and execute )
- [code.asm] is the source code of your assembly program
- [machine.img] is the binary file generated post translation
- [inputs.dat] is a read only file to load a custom dump to the memory 
- [output.txt] is the output file for memory dump

Program Example

Write your code in a text file with the .asm extension like this:

*	void inorden(Arbol *A){
*  	if(*A != null){
*		inorden(A->izq);
*		printf("%d\n, A->dato);
*        	inorden(A->der);
*	}

   IZQ EQU 1
   DER EQU 2

   PUSH BX
   CALL INORDEN
   ADD SP,1
   STOP


INORDEN: PUSH BP
        MOV BP, SP
        PUSH FX
     
        MOV FX, [BP+2]
        CMP FX, -1
        JZ FIN2
     
        PUSH [FX+IZQ]
        CALL INORDEN
        ADD SP, 1

        MOV AX, %A5
        MOV CX, 1
        MOV DX, FX
        SYS 2

        
        PUSH [FX+DER]
        CALL INORDEN
        ADD SP, 1

FIN2:    POP FX
        MOV SP, BP
        POP BP
        RET