Global Lisp Registers:
	NULL - Wired NIL register.
	CSP - Control stack pointer.
	CONT - Continuation pointer.
	NSP - Number stack pointer.
	BSP - Binding stack pointer.
	FLAGS - Special flags register.
	ALLOC - Allocation pointer.
	CODE - Current code object.

Linkage Registers:
	NARGS - Number of arguments or values.
	LEXENV - Lexical Environment being called.
	OLDCONT - Old continuation pointer.
	CNAME - Name of called function.
	A0-A5 - First 6 arguments.
	ARGS - Argument pointer.
	LRA - Lisp Return Address.


  Reg	CN  PR	C Usage		LN 	Lisp Usage		GC
------------------------------------------------------------------------
  R0	-   -	Wired Zero	ZERO	Wired Zero		N
  R1	-   N	Assembler Temp	LIP	Lisp-Interior		Special
  R2	v0  N   Results		NL0	Non-Lisp Reg		N
  R3	v1  N	Static Link	NL1	Non-Lisp Reg		N
  R4	a0  N	Integer Arg	NL2	Non-Lisp Reg		N
  R5	a1  N	Integer Arg	NL3	Non-Lisp Reg		N
  R6	a2  N	Integer Arg	NL4	Non-Lisp Reg		N
  R7	a3  N	Integer Arg	NARGS	Arg Count		N
  R8	t0  N	Temporary Reg	A0	Argument		Y
  R9	t1  N	Temporary Reg	A1	Argument		Y
  R10	t2  N	Temporary Reg	A2	Argument		Y
  R11	t3  N	Temporary Reg	A3	Argument		Y
  R12	t4  N	Temporary Reg	A4	Argument		Y
  R13	t5  N	Temporary Reg	A5	Argument		Y
  R14	t6  N	Temporary Reg	CNAME	Call Name		Y
  R15	t7  N	Temporary Reg	LEXENV	Lexical Env		Y
  R16	s0  Y	Saved Temp Reg	ARGS	Arg Pointer		Y
  R17	s1  Y	Saved Temp Reg	OLDCONT	Old Continuation	Y
  R18	s2  Y	Saved Temp Reg	LRA	Lisp Return Address	Y
  R19	s3  Y	Saved Temp Reg	L0	Random Lisp Reg		Y
  R20	s4  Y	Saved Temp Reg	NULL	Null / Nil Constant	Y
  R21	s5  Y	Saved Temp Reg	BSP	Binding Stack Pointer	Special
  R22	s6  Y	Saved Temp Reg	CONT	Current Continuation	Special
  R23	s7  Y	Saved Temp Reg	CSP	Control Stack Pointer	Special
  R24	t8  N	Temporary Reg	FLAGS	Flags register		N
  R25   t9  N	Temporary Reg	ALLOC	Allocation Pointer	Special
  R26	k0  -	(reserved)	-	Kernel Reg (reserved)	N
  R27	k1  -	(reserved)	-	Kernel Reg (reserved)	N
  R28	gp  -	Global Pointer	L1	Random Lisp Reg		Y
  R29   sp  -	Stack Pointer	NSP	Number Stack Pointer	N
  R30	s8  Y	Saved Temp Reg	CODE	Code Pointer		Y
  R31	ra  N	Return Addr	L2	Random Lisp Reg		Y

Key:
	CN == C/UNIX name
	NL == Lisp name
	PR == Preserved on C function call (callee saves)
	GC == Considered as a root for GC