CAR: added stack operations, call, ret, jmp and some other random stuff

README.md

@@ -1,22 +1,19 @@
-#Cool ARM Ripoff
+# Cool ARM Ripoff
 
 *A simple (and ridiculous) virtual machine/CPU made for no real reason/purpose.*
 
 ***Written in C, made by David Goeke.***
 
 
-###Current features:
+### Current features:
 - few to none.
 - 32 general purpose registers
 - 32-bit addresses
 
-###Needed features:
-- push/pop
-- call/ret
-- jmp/conditional jmps
-- store high 11 bits of an immediate in memory
+### Needed features:
+- conditional jmps
 
-###instuctions (arithmetic):
+### Instuctions (arithmetic):
 - add
 - sub (subtract)
 - mul (multiply)
@@ -31,8 +28,13 @@
 - xor (logical XOR)
 - not (logical NOT/invertion)
 - xchg (exchange registers)
+- fp_add (add floating point values in registers)
+- fp_sub (subtract floating point values in registers)
+- fp_mul (multiply floating point values in registers)
+- fp_div (divide floating point values in registers)
+- fp_mod (modulus (division remainder) floating point values in registers)
 
-###Insutrctions (load/store):
+### Insutrctions (load/store):
 - ldr (load register with value from memory, using the program counter as the base)
 - lds (load register with value from memory, using the stack pointer as the base)
 - ldb (load register with value from memory, using a specified register as the base)
@@ -43,6 +45,14 @@
 - ldh (load high 11 bits of register with immediate)
 - sti (store a 21-bit immediate at memory, using the program counter as the base)
 - stj (store a 21-bit immediate at memory, using the stack pointer as the base)
+- push (push register onto stack)
+- pushi (push 21-bit immediate onto stack)
+- pop (pop value from stack into register)
+- sth (stroe high 11 bits of register to memory, using pc as the base)
+- stk (stroe high 11 bits of register to memory, using sp as the base)
 
-###Instructions (misc):
+### Instructions (misc):
 - nop (do nothing)
+- call (call subroutine/function)
+- ret (return from subroutine/function)
+- jmp (jump to memory address)