59 lines
2.1 KiB
Markdown
59 lines
2.1 KiB
Markdown
# Cool ARM Ripoff
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*A simple (and ridiculous) virtual machine/CPU made for no real reason/purpose.*
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***Written in C, made by David Goeke.***
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### Current features:
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- few to none.
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- 32 general purpose registers
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- 32-bit addresses
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### Needed features:
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- conditional jmps
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### Instuctions (arithmetic):
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- add
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- sub (subtract)
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- mul (multiply)
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- div (divide)
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- mod (modulus, division remainder)
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- shl (logical shift left)
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- shr (logical shift right)
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- ahr (arithmetic shift right)
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- ror (logical rotate right)
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- and (logical AND)
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- or (logical OR)
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- xor (logical XOR)
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- not (logical NOT/invertion)
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- xchg (exchange registers)
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- fp_add (add floating point values in registers)
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- fp_sub (subtract floating point values in registers)
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- fp_mul (multiply floating point values in registers)
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- fp_div (divide floating point values in registers)
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- fp_mod (modulus (division remainder) floating point values in registers)
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### Insutrctions (load/store):
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- ldr (load register with value from memory, using the program counter as the base)
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- lds (load register with value from memory, using the stack pointer as the base)
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- ldb (load register with value from memory, using a specified register as the base)
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- ldi (load register with and immediate value, only low 21 bits)
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- str (store register at memory, using the program counter as the base)
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- sts (store register at memory, using the stack pointer as the base)
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- stb (store register at memory, using the specified register as the base)
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- ldh (load high 11 bits of register with immediate)
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- sti (store a 21-bit immediate at memory, using the program counter as the base)
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- stj (store a 21-bit immediate at memory, using the stack pointer as the base)
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- push (push register onto stack)
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- pushi (push 21-bit immediate onto stack)
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- pop (pop value from stack into register)
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- sth (stroe high 11 bits of register to memory, using pc as the base)
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- stk (stroe high 11 bits of register to memory, using sp as the base)
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### Instructions (misc):
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- nop (do nothing)
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- call (call subroutine/function)
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- ret (return from subroutine/function)
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- jmp (jump to memory address)
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