#| -*-Scheme-*-

$Id: mips.scm,v 1.8 2007/01/05 21:19:21 cph Exp $

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

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it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
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WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

;;;; MIPS instruction set

(declare (usual-integrations))

(let-syntax
    ((opcodes
      (sc-macro-transformer
       (lambda (form environment)
	 environment
	 `(BEGIN
	    ,@(let loop ((names (caddr form)) (value 0))
		(if (pair? names)
		    (if (symbol? (car names))
			(cons `(DEFINE-INTEGRABLE
				 ,(symbol-append (car names) (cadr form))
				 ,value)
			      (loop (cdr names) (+ value 1)))
			(loop (cdr names) (+ value 1)))
		    '())))))))
  ; OP CODES
  (opcodes '-OP
    (special bcond j    jal   beq  bne blez bgtz	; 0  - 7
     addi    addiu slti sltiu andi ori xori lui		; 8  - 15
     cop0    cop1  cop2 cop3  ()   ()  ()   ()		; 16 - 23
     ()      ()    ()   ()    ()   ()  ()   ()		; 24 - 31
     lb      lh    lwl  lw    lbu  lhu lwr  ()		; 32 - 39
     sb      sh    swl  sw    ()   ()  swr  ()		; 40 - 47
     lwc0    lwc1  lwc2 lwc3  ()   ()  ()   ()		; 48 - 55
     swc0    swc1  swc2 swc3  ()   ()  ()   ()))	; 56 - 63

  ; Special Function Codes
  (opcodes '-FUNCT
    (sll  ()    srl  sra  sllv    ()    srlv srav	; 0  - 7
     jr   jalr  ()   ()   syscall break ()   ()		; 8  - 15
     mfhi mthi  mflo mtlo ()      ()    ()   ()		; 16 - 23
     mult multu div  divu ()      ()    ()   ()		; 24 - 31
     add  addu  sub  subu and     or    xor  nor	; 32 - 39
     ()   ()    slt  sltu ()      ()    ()   ()		; 40 - 47
     ()   ()    ()   ()   ()      ()    ()   ()		; 48 - 55
     ()   ()    ()   ()   ()      ()    ()   ()))	; 56 - 63

  ; Condition codes for BCOND
  (opcodes '-COND
    (bltz   bgez  () () () () () ()			; 0  - 7
     ()     ()    () () () () () ()			; 8  - 15
     bltzal bgezal  () () () () () ()			; 16 - 23
     ()     ()    () () () () () ()))			; 24 - 31

  ; Floating point function codes for use with COP1 instruction
  (opcodes 'F-OP
    (add   sub    mul   div   ()    abs   mov   neg	; 0  - 7
     ()    ()     ()    ()    ()    ()    ()    ()	; 8  - 15
     ()    ()     ()    ()    ()    ()    ()    ()	; 16 - 23
     ()    ()     ()    ()    ()    ()    ()    ()	; 24 - 31
     cvt.s cvt.d  ()    ()    cvt.w ()    ()    ()	; 32 - 39
     ()    ()     ()    ()    ()    ()    ()    ()	; 40 - 47
     c.f   c.un   c.eq  c.ueq c.olt c.ult c.ole c.ule	; 48 - 55
     c.sf  c.ngle c.seq c.ngl c.lt  c.nge c.le  c.ngt)) ; 56 - 63
) ; let-syntax

; Operations on co-processors (for BCzFD, BCzT, CFCz, COPz, CTCz,
;                                  MFCz, and MTCz instructions)
; This is confusing ... according to the diagrams, these occupy bits
; 16 through 25, inclusive (10 bits).  But the tables indicate that
; only bits 16, and 21 through 25 matter.  In fact, bit 25 is always 0
; since that denotes a COPz instruction; hence COPz has 32 encodings
; and all the others have two encodings.

(define-integrable mf-cp-op #x000)
(define-integrable mt-cp-op #x080)
(define-integrable bcf-cp-op #x100)
(define-integrable bct-cp-op #x101)
(define-integrable cf-cp-op #x040)
(define-integrable ct-cp-op #x0C0)

(define-integrable mf-cp-op-alternate #x001)
(define-integrable mt-cp-op-alternate #x081)
(define-integrable bcf-cp-op-alternate #x180)
(define-integrable bct-cp-op-alternate #x181)
(define-integrable cf-cp-op-alternate #x041)
(define-integrable ct-cp-op-alternate #x0C1)

; Operations on co-processor 0
(define-integrable cop0-op:tlbr 1)
(define-integrable cop0-op:tlbwi 2)
(define-integrable cop0-op:tlbwr 6)
(define-integrable cop0-op:tlbp 8)
(define-integrable cop0-op:rfe 16)

; Floating point formats
(define-integrable single-precision-float 0)
(define-integrable double-precision-float 1)
