homets/minivm

Minivm with assembly instructons, register, stacks, etc.

Minivm

btw this is a project to learn java

Register

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Pointer Register

ip = instruction pointer
sp = Stack pointer
bp = base pointer

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Control Register

zf = zero flag 
sf = sign flag
cf = call flag (created for my vm to check succes of last syscall)

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Data Register

a, b, c, d (maybe will give real register name)

Instruction

Two operand instruction

add = addition
sub = substraction
mul = multiplication
div = division
xor = exclusive or 
mov = the value of the first operand will be identical to the second operand
cmp = compare the first and the last operand

One operand instruction

push = put the value on the top of the stack
pop = Loads the value from the top of the stack to the location specified
inc = incrementation
dec = decrementation
jmp = jump to the instruction pointed by the integer provided
je = jump if zero flag is equal to 1
jne = jump if zero flag is equal to 0
jge = jump if sign flag is equal to 0
jg = jump if sign flag is equal to 0 and zero flag equal 0
jle = jump if sign flag is equal to 1
jl = jump if sign flag is equal to 1 and zero flag equal 0
jz = jump if zero flag is equal to 1
jnz = jump if zero flag is equal to 0

Syscall

print = print a message with element in the stack