rexxsyslib.library jump table

Our open rexxsyslib.library: 17 calls with the same LVOs and registers as AmigaOS 3.2's, checked against the NDK 3.2 .fd file.

Copyright (c) 2026 DalsinAI. MIT licence (see LICENSE at the repository root). rexxsyslib.library's jump table, as OpenRexxSysLib builds it: LVO, call, registers, then the core class (OPEN_LIBRARIES.md section 5) as a comment. build-amiga.sh (with ../common/check_fd.py) checks the first three columns against the NDK 3.2 rexxsyslib_lib.fd in the stove and stops on any difference; openrexxsyslib_lib.c's lib_vectors[] follows it line for line. Slots the FD leaves out are the interpreter's (private). pure: no shared state; locked: the base's own count; anchored: exec's port list. No call has a native body yet: each is an allocation and a copy, cheaper than a call out.

33 slots, 17 public
LVO	Call	Registers	Notes
-30	private	none
-36	private	none
-42	private	none
-48	private	none
-54	private	none
-60	private	none
-66	private	none
-72	private	none
-78	private	none
-84	private	none
-90	private	none
-96	private	none
-102	private	none
-108	private	none
-114	private	none
-120	private	none
-126	CreateArgstring	a0, d0	pure
-132	DeleteArgstring	a0	pure
-138	LengthArgstring	a0	pure
-144	CreateRexxMsg	a0, a1, d0	pure
-150	DeleteRexxMsg	a0	pure
-156	ClearRexxMsg	a0, d0	pure
-162	FillRexxMsg	a0, d0, d1	pure
-168	IsRexxMsg	a0	pure
-450	LockRexxBase	d0	locked
-456	UnlockRexxBase	d0	locked
-480	CreateRexxHostPort	a0	anchored
-486	DeleteRexxHostPort	a0	anchored
-492	GetRexxVarFromMsg	a0, a2, a1	the interpreter's
-498	SetRexxVarFromMsg	a0, a2, a1	the interpreter's
-504	LaunchRexxScript	a0, a1, a2, d1, d2	anchored
-510	FreeRexxMsg	a0	pure
-516	GetRexxBufferFromMsg	a0, a2, a1, d0	the interpreter's