299 lines
5.7 KiB
NASM
299 lines
5.7 KiB
NASM
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subttl emdisp.asm - Emulator Dispatch Tables
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page
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;
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; IBM/Microsoft Confidential
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;
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; Copyright (c) IBM Corporation 1987, 1989
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; Copyright (c) Microsoft Corporation 1987, 1989
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;
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; All Rights Reserved
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;
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;Revision History: (also see emulator.hst)
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;
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; 1/21/92 JWM Minor modifications for DOSX32 emulator
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; 8/23/91 TP Direct dispatch off of 6-bit opcode
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; 10/30/89 WAJ Added this header.
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;
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;*******************************************************************************
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;*********************************************************************;
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; ;
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; Dispatch Tables ;
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; ;
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;*********************************************************************;
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; These tables are based upon the layout of the 8087 instructions
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;
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; 8087 instruction fields: |escape|MF|Arith|MOD|Op|r/m|disp1|disp2|
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; field length in bits: 5 2 1 2 3 3 8 8
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;
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; Disp1 and Disp2 are optional address bytes present only if MOD <> 11.
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; When (MOD <> 11) r/m describes which regs (SI,DI,BX,BP) are added to
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; Disp1 and Disp2 to calculate the effective address. This form
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; (memory format) is used for Loads, Stores, Compares, and Arithmetic
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; When using memory format MF determines the Type of the Memory operand
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; i.e. Single Real, Double real, Single Integer, or Double Integer
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; Arith is 0 for Arithmetic opetations (and compares), set to 1 otherwise
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; Op mostly determines which type of operation to do though when not in
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; memory format some of that is coded into MF and r/m
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; All of the tables are set up to do a jump based upon one or more of the
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; above fields. The outline for decoding instructions is:
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;
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; IF (memory format) THEN
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; Assemble Effective Address (using MOD and r/m and EffectiveAddressTab)
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; Jump through table to operation, using MF, Arith and Op bits
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; ELSE (Register format)
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; Jump through table to operation, using MF, Arith and Op bits
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ALIGN 4
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;*********************************************************************;
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;
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; Memory address calculation tables
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EA386Tab label dword ; Uses |r/m|MOD+1| for indexing
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dd NoEffectiveAddress
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dd Exx00 ; eax
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dd Exx01
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dd Exx10
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dd NoEffectiveAddress
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dd Exx00 ; ecx
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dd Exx01
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dd Exx10
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dd NoEffectiveAddress
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dd Exx00 ; edx
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dd Exx01
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dd Exx10
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dd NoEffectiveAddress
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dd Exx00 ; ebx
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dd Exx01
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dd Exx10
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dd NoEffectiveAddress
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dd SIB00 ; esp (S-I-B follows)
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dd SIB01
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dd SIB10
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dd NoEffectiveAddress
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dd Direct386 ; ebp (00 = direct addressing)
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dd Exx01
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dd Exx10
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dd NoEffectiveAddress
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dd Exx00 ; esi
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dd Exx01
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dd Exx10
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dd NoEffectiveAddress
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dd Exx00 ; edi
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dd Exx01
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dd Exx10
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;*********************************************************************;
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;
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;Opcode dispatching tables
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;Indexed by | op1 | op2 |0 0| (op1 = MF|Arith)
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public tOpRegDisp
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tOpRegDisp label dword
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dd eFADDtop
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dd eFMULtop
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dd eFCOM
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dd eFCOMP
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dd eFSUBtop
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dd eFSUBRtop
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dd eFDIVtop
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dd eFDIVRtop
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dd eFLDreg
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dd eFXCH
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dd eFNOP ;UNDONE: also reserved on 387
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dd eFSTP ;Special form 1
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dd GroupFCHS ;FCHS,FABS,FTST,FXAM
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dd GroupFLD1 ;FLD1,FLDL2T,FLDL2E,FLDPI,FLDLG2,FLDLN2,FLDZ
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dd GroupF2XM1 ;F2XM1,FYL2X,FPTAN,FPATAN,FXTRACT,FPREM1,FDECSTP,FINCSTP
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dd GroupFPREM ;FPREM,FYL2XP1,FSQRT,FSINCOS,FRNDINT,FSCALE,FSIN,FCOS
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dd UNUSED
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dd UNUSED
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dd UNUSED
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dd UNUSED
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dd UNUSED
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dd eFUCOMPP ;UNDONE: also reserved on 387
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dd UNUSED
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dd UNUSED
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dd UNUSED
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dd UNUSED
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dd UNUSED
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dd UNUSED
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dd GroupFENI ;FENI,FDISI,FCLEX,FINIT
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dd UNUSED
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dd UNUSED
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dd UNUSED
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dd eFADDreg
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dd eFMULreg
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dd eFCOM ;Special form 2
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dd eFCOMP ;Special form 3
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dd eFSUBRreg
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dd eFSUBreg
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dd eFDIVRreg
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dd eFDIVreg
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dd eFFREE
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dd eFXCH ;Special form 4
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dd eFST
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dd eFSTP
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dd eFUCOM
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dd eFUCOMP
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dd UNUSED
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dd UNUSED
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dd eFADDPreg
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dd eFMULPreg
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dd eFCOMP ;Special form 5
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dd eFCOMPP ;UNDONE: also reserved on 387
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dd eFSUBRPreg
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dd eFSUBPreg
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dd eFDIVRPreg
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dd eFDIVPreg
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dd eFFREE ;Special form 6 UNDONE: "and pop stack"?
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dd eFXCH ;Special form 7
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dd eFSTP ;Special form 8
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dd eFSTP ;Special form 9
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dd eFSTSWax ;UNDONE: also reserved on 387
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dd UNUSED
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dd UNUSED
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dd UNUSED
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tOpMemDisp label dword
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;MF = 00 (32-bit Real), Arith = 0
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dd eFADD32
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dd eFMUL32
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dd eFCOM32
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dd eFCOMP32
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dd eFSUB32
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dd eFSUBR32
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dd eFDIV32
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dd eFDIVR32
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;MF = 00 (32-bit Real), Arith = 1
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dd eFLD32
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dd UNUSED
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dd eFST32
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dd eFSTP32
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dd eFLDENV
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dd eFLDCW
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dd eFSTENV
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dd eFSTCW
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;MF = 01 (32-bit Int), Arith = 0
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dd eFIADD32
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dd eFIMUL32
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dd eFICOM32
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dd eFICOMP32
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dd eFISUB32
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dd eFISUBR32
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dd eFIDIV32
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dd eFIDIVR32
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;MF = 01 (32-bit Int), Arith = 1
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dd eFILD32
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dd UNUSED
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dd eFIST32
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dd eFISTP32
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dd UNUSED
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dd eFLD80
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dd UNUSED
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dd eFSTP80
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;MF = 10 (64-bit Real), Arith = 0
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dd eFADD64
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dd eFMUL64
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dd eFCOM64
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dd eFCOMP64
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dd eFSUB64
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dd eFSUBR64
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dd eFDIV64
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dd eFDIVR64
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;MF = 10 (64-bit Real), Arith = 1
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dd eFLD64
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dd UNUSED
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dd eFST64
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dd eFSTP64
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dd eFRSTOR
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dd UNUSED
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dd eFSAVE
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dd eFSTSW
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;MF = 11 (16-bit Int), Arith = 0
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dd eFIADD16
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dd eFIMUL16
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dd eFICOM16
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dd eFICOMP16
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dd eFISUB16
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dd eFISUBR16
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dd eFIDIV16
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dd eFIDIVR16
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;MF = 11 (16-bit Int), Arith = 1
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dd eFILD16
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dd UNUSED
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dd eFIST16
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dd eFISTP16
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dd eFBLD
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dd eFILD64
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dd eFBSTP
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dd eFISTP64
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tGroupFLD1disp label dword
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dd eFLD1
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dd eFLDL2T
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dd eFLDL2E
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dd eFLDPI
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dd eFLDLG2
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dd eFLDLN2
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dd eFLDZ
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dd UNUSED
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tGroupF2XM1disp label dword
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dd eF2XM1
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dd eFYL2X
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dd eFPTAN
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dd eFPATAN
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dd eFXTRACT
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dd eFPREM1
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dd eFDECSTP
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dd eFINCSTP
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tGroupFCHSdisp label dword
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dd eFCHS
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dd eFABS
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dd UNUSED
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dd UNUSED
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dd eFTST
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dd eFXAM
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dd UNUSED
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dd UNUSED
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tGroupFPREMdisp label dword
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dd eFPREM
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dd eFYL2XP1
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dd eFSQRT
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dd eFSINCOS
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dd eFRNDINT
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dd eFSCALE
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dd eFSIN
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dd eFCOS
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tGroupFENIdisp label dword
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dd eFENI
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dd eFDISI
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dd eFCLEX
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dd eFINIT
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dd eFSETPM
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dd UNUSED
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dd UNUSED
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dd UNUSED
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