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338 lines
9.8 KiB
Plaintext
338 lines
9.8 KiB
Plaintext
;EASE$$$ READ ONLY COPY of file ÒFP881ctrl.aÓ
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; 1.1 CCH 11/11/1988 Fixed Header.
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; 1.0 CCH 11/ 9/1988 Adding to EASE.
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; OLD REVISIONS BELOW
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; 1.0 BBM 2/12/88 Adding file for the first time into EASEÉ
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; END EASE MODIFICATION HISTORY
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; File: FP881ctrl.a
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;; Implementation of FP68K for machines using the Motorola MC68881
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;; Copyright Apple Computer, Inc. 1985,1986,1987
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;; All Rights Reserved
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;; Confidential and Proprietary to Apple Computer,Inc.
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;;
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;; Written by Clayton Lewis, begun 7 Feb 85.
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;; Debugged by Stuart McDonald.
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;;
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;; Modification history:
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;; Rev5: 27 May 85
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;; Rev6: 19 Dec 85 fix CVTz2x bug
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;; Rev7: 16 Jun 86 CRL moved to MPW
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;; Rev8: 11 Oct 86 -S.McD. changed version number from 3 to 4 .
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;; 21 Nov 86 -S.McD. set chips IEEE status defaults, too.
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;; Rev9: 06 Jan 87 -S.McD. changed version number from 4 to 5 .
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;; 15 Jan 87 -S.McD. changed status and copyright notice.
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;; 16 Jan 87 -S.McD. Arith and IntOp tables combinded; _SYSERROR call added.
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;; 23 Jan 87 -S.McD. MC68881 directive moved to file fp881.a .
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;; RevA: 24 Jan 87 -S.McD. changed version number from 5 to 6 .
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; The stack looks like:
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;; _______________________________________________
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;; | |
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;; | address of argument 3 (if any) | - Long
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;; |_______________________________________________|
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;; | |
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;; | address of argument 2 (if any) | - Long
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;; |_______________________________________________|
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;; | |
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;; | address of argument 1 (if any) | - Long
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;; |_______________________________________________|
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;; | |
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;; | opword | - Word
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;; |_______________________________________________|
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;; | |
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;; | return address | - Long
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;; |_______________________________________________|
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;;
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;; Where the number of addresses depends on the operation, most use 2, some use 0 or 1.
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;; Only binary -> decimal conversion uses 3.
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;;
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;; Grow the stack in case a trap is taken and save registers D0, D1, A0, A1.
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;;
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;; | |
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;; | stack as passed |
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;; |_______________________________________________|
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;; | |
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;; | link | - Long
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;; |_______________________________________________|
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;; | |
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;; | byte count | - Word
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;; |_______________________________________________|
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;; | |
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;; | saved registers | - Several
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;; |_______________________________________________|
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;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;This is the sole entry point of the package.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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BRA.S FPbegin
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DC.W $00
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STRING ASIS
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DC.B 'PACK'
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DC.W $4
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DC.W $0006 ; version 6
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Beginning of code.
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;; Reserve space, save registers,
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;; opword -> D0, destination -> FP0, source address -> A0
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;; save control/status information in D5
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;; disable halts and clear exceptions (until haltcheck at end of package).
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;; D5.hi = loword of status; D5.lo = loword of control
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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FPbegin
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LINK A6,#-2 ; byte count word for halt handler
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MOVEM.L D0/D1/D5/A0/A1,-(SP)
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FMOVE FPSR,D5 ; collect user status register. Save permanently in D5.hi
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MOVEQ #0,D1
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SWAP D5 ; move exception stuff to hi byte
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FMOVE FPCR,D0 ; collect user control register. Save permanently in D5.lo
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MOVE.W D0,D5 ; [exceptions|Aexceptions|halts|rounding] now in D5
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BEQ.S @1 ; skip 881 call if halts already disabled
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MOVE.B D5,D1 ; copy of control with cleared halt settings
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FMOVE D1,FPCR ; restore control with no halts set
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Handle odd instructions elsewhere. (those not done by the 68881)
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;; Even instructions are handled by the 68881.(except classify)
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;; Place an altered opword in D1:
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;;
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;; v_______________v_______________v_______________v_______________v
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;; | | | | | | | | |not| S | D | | | | | |
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;; | | | | | | | | |SDX| C | L | o | o | o | o |zro|
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;; |___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|
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;;
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;; |src format | operation mask |
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;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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MOVEQ #0,D1 ; for line below and table addressing
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@1
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MOVE.W LKOP(A6),D0 ; opword
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BTST D1,D0 ; arithmetic or nonarithmetic?
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BNE NonArith
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FMOVE D1,FPSR ; IEEE default status -S.McD.
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ANDI.W #OPMASK,D0 ; leave only format & even opcode
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CMP.B #$0E,D0
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BLT.S @3 ; basic 2 argument operations
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CMP.B #$12,D0
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BLT.S @2 ; CVT routines, handled specially
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CMP.B #$1C,D0
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BEQ.S @6 ; classify, handled as if no arguments
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BRA.S @4 ; others are one argument (and scalb)
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@2
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MOVEA.L LKADR2(A6),A0 ; set up only addresses for convert
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MOVEA.L LKADR1(A6),A1
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BRA.S @6
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@3
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Move the address of the source to A0.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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MOVEA.L LKADR2(A6),A0
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@4
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Move the (extended) destination value to the chip.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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MOVEA.L LKADR1(A6),A1
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ADDQ.L #6,A1
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MOVE.L (A1),-(SP)
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MOVE.L -(A1),-(SP)
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SUBQ.L #2,A1
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MOVE.L (A1),-(SP)
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FMOVE.X (SP)+,FP0
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@6
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MOVE.B D0,D1 ; opcode bits into D1
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LSR.W #6,D0 ; format to bits 5-7
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OR.B D0,D1
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Jump to required operation with floating point source format.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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ArithOp
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MOVE.W ArithTab(D1),D1
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JMP ArithOp(D1)
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ArithTab
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DC.W ADDext-ArithOp
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DC.W SUBext-ArithOp
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DC.W MULext-ArithOp
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DC.W DIVext-ArithOp
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DC.W CMPext-ArithOp
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DC.W CPXext-ArithOp
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DC.W REMext-ArithOp
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DC.W CVText2E-ArithOp
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DC.W CVTE2ext-ArithOp
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DC.W SQRText-ArithOp
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DC.W RINText-ArithOp
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DC.W TINText-ArithOp
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DC.W SCALBext-ArithOp
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DC.W LOGBext-ArithOp
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DC.W CLASSext-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W ADDdbl-ArithOp
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DC.W SUBdbl-ArithOp
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DC.W MULdbl-ArithOp
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DC.W DIVdbl-ArithOp
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DC.W CMPdbl-ArithOp
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DC.W CPXdbl-ArithOp
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DC.W REMdbl-ArithOp
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DC.W CVTdbl2E-ArithOp
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DC.W CVTE2dbl-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W CLASSdbl-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W ADDsgl-ArithOp
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DC.W SUBsgl-ArithOp
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DC.W MULsgl-ArithOp
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DC.W DIVsgl-ArithOp
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DC.W CMPsgl-ArithOp
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DC.W CPXsgl-ArithOp
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DC.W REMsgl-ArithOp
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DC.W CVTsgl2E-ArithOp
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DC.W CVTE2sgl-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W CLASSsgl-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Jump to required operation with integer source format.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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DC.W ADDint-ArithOp
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DC.W SUBint-ArithOp
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DC.W MULint-ArithOp
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DC.W DIVint-ArithOp
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DC.W CMPint-ArithOp
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DC.W CPXint-ArithOp
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DC.W REMint-ArithOp
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DC.W CVTint2E-ArithOp
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DC.W CVTE2int-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W Scalbext-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W ADDlong-ArithOp
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DC.W SUBlong-ArithOp
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DC.W MULlong-ArithOp
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DC.W DIVlong-ArithOp
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DC.W CMPlong-ArithOp
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DC.W CPXlong-ArithOp
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DC.W REMlong-ArithOp
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DC.W CVTlong2E-ArithOp
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DC.W CVTE2long-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W ADDcomp-ArithOp
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DC.W SUBcomp-ArithOp
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DC.W MULcomp-ArithOp
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DC.W DIVcomp-ArithOp
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DC.W CMPcomp-ArithOp
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DC.W CPXcomp-ArithOp
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DC.W REMcomp-ArithOp
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DC.W CVTcomp2E-ArithOp
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DC.W CVTE2comp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W CLASScomp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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DC.W UnknownOp-ArithOp
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Non-arithmetic routines. Not handled directly by 68881.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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NonArith
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MOVE.W D0,D1 ; save opcode for nextafter
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ANDI.W #OPMASK2,D0 ; leave only even opcode
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NAop
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MOVE.W NATab(D0),D0
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JMP NAop(D0)
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NATab
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DC.W SetEnv-NAop
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DC.W GetEnv-NAop
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DC.W SetHv-NAop
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DC.W GetHv-NAop
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DC.W D2B-NAop
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DC.W B2D-NAop
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DC.W Negate-NAop
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DC.W Abs-NAop
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DC.W CopySign-NAop
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DC.W NextAfter-NAop
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DC.W SetExp-NAop
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DC.W ProcEnt-NAop
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DC.W ProcEx-NAop
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DC.W TestExp-NAop
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DC.W UnknownOp-NAop
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DC.W UnknownOp-NAop
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UnknownOp
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MOVEQ #81,D0 ; Error exit for unknown Op code. -S.McD.
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_SysError
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