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cobbweb/vm.js

Created December 2, 2011 02:05
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Virtual Machine
Raw
vm.js
var VM = {
cpu: {
ip: 0x00,
r0: 0x00,
r1: 0x00,
r2: 0x00,
r3: 0x00,
cs: 0x00,
ds: 0x10,
fl: 0x00,
firmware: [0xd2ab1f05, 0xda13f110]
},
mem: [
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],
exec: function()
{
// virtual machine architecture
// ++++++++++++++++++++++++++++
//
// segmented memory model with 16-byte segment size (notation seg:offset)
//
// 4 general-purpose registers (r0-r3)
// 2 segment registers (cs, ds equiv. to r4, r5)
// 1 flags register (fl)
//
// instruction encoding
// ++++++++++++++++++++
//
// byte 1 byte 2 (optional)
// bits [ 7 6 5 4 3 2 1 0 ] [ 7 6 5 4 3 2 1 0 ]
// opcode - - -
// mod -
// operand1 - - - -
// operand2 - - - - - - - -
//
// operand1 is always a register index
// operand2 is optional, depending upon the instruction set specified below
// the value of mod alters the meaning of any operand2
// 0: operand2 = reg ix
// 1: operand2 = fixed immediate value or target segment (depending on instruction)
//
// instruction set
// +++++++++++++++
//
// Notes:
// * r1, r2 => operand 1 is register 1, operand 2 is register 2
// * movr r1, r2 => move contents of register r2 into register r1
//
// opcode | instruction | operands (mod 0) | operands (mod 1)
// -------+-------------+------------------+-----------------
// 0x00 | jmp | r1 | r2:r1
// 0x01 | movr | r1, r2 | rx, imm
// 0x02 | movm | r1, [ds:r2] | [ds:r1], r2
// 0x03 | add | r1, r2 | r1, imm
// 0x04 | xor | r1, r2 | r1, imm
// 0x05 | cmp | r1, r2 | r1, imm
// 0x06 | jmpe | r1 | r2:r1
// 0x07 | hlt | N/A | N/A
//
// flags
// +++++
//
// cmp r1, r2 instruction results in:
// r1 == r2 => fl = 0
// r1 < r2 => fl = 0xff
// r1 > r2 => fl = 1
//
// jmpe r1
// => if (fl == 0) jmp r1
// else nop
throw "VM.exec not yet implemented";
}
};
//--------------------------------------------------------------------------------------------------
try
{
VM.exec();
}
catch(e)
{
alert('\nError: ' + e + '\n');
}
//--------------------------------------------------------------------------------------------------
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