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A2osX/SCMASM.31/ASM65816.S..txt

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NEW
AUTO 3,1
*--------------------------------------
.DUMMY
.OR $A700
ASM65816.SEARCH.TABLE .BS 3
ASM65816.GNC .BS 3
ASM65816.GNC.UC .BS 3
ASM65816.GNNB .BS 3
ASM65816.EXPR .BS 10
ASM65816.EXP1 .BS 10
ASM65816.ASM.ERROR .BS 3
ASM65816.EMIT .BS 10
*--------------------------------
.OR $F0 F0-FF is ASM private ZeroPage
LEVEL.MASK .BS 1
OPBASE .BS 1
MODE.BYTE .BS 1
FORCE.ADDR.SIZE .BS 1
.ED
*--------------------------------
ERR.BAD.OPCODE .EQ 0
ERR.BAD.ADDRESS .EQ 1
ERR.RANGE .EQ 2
ERR.UNDEFINED .EQ 3
*--------------------------------
JMP ASM65816.ASM.INIT
JMP ASM65816.ASM.LINE
JMP ASM65816.EMIT.VALUE
JMP DIR.OP
*--------------------------------
.AS -/FOR THE 6502, 65C02, 65R02, 65816/
.HS 00
*--------------------------------
ASM65816.ASM.INIT
LDA #0 MASK FOR 6502
STA LEVEL.MASK
LDA #15 MARGIN FOR 6502
STA EMIT.MARGIN
RTS
*--------------------------------
ASM65816.ASM.LINE
LDA SEARCH.KEY 1ST LETTER
CMP #'A'
BCC .5 ...NOT A LETTER, SO BADOP
CMP #'Z'+1
BCS .5 ...NOT A LETTER, SO BADOP
AND #$1F MAKE 01...1A
TAX
LDA FIRST.LETTER.TABLE-1,X
BNE .8 ...UNUSED LETTER
.5 JMP BADOPERR
*---BUILD OPTBL.PNTR INTO TABLE--------
.8 ADC #OPCODE.TABLE CARRY CLEAR ALREADY
STA OPTBL.PNTR
LDY /OPCODE.TABLE
BCC .1
INY
.1 CPX #'R'-$40 WHICH HALF OF TABLE?
BCC .2 ...FIRST HALF
INY ...SECOND HALF
.2 CLC INITIAL SEARCH
.3 JSR ASM65816.SEARCH.TABLE
BCC .5 ...NOT FOUND
*---FOUND IT!--------------------
LDA (OPTBL.PNTR),Y
STA OPBASE
INY
LDA (OPTBL.PNTR),Y
AND #$E1 ISOLATE LEVEL BITS
BEQ .7 ...PLAIN 6502 LEVEL
AND LEVEL.MASK
BNE .7 ...ALLOWS 'STP' FOR BOTH 65816 & SWEET-16
SEC CONTINUE SEARCH
BCS .3 ...ALWAYS
*---BRANCH TO PROCESS OPCODE-----
.7 LDA (OPTBL.PNTR),Y
AND #$1E
TAY
LDA OP.MODE+1,Y
PHA
LDA OP.MODE,Y
PHA
RTS
*--------------------------------
.MA MODE
O..]1 .EQ *-OP.MODE
.DA OP.]1-1
.EM
*--------------------------------
OP.MODE
>MODE SNGL 0 -- SINGLE BYTE OPCODES
>MODE COPS 2 -- LDA GROUP
>MODE SHIFTS 4 -- ASL GROUP
>MODE REL16 6 -- BRL & PER
>MODE REL8 8 -- RELATIVE BRANCHES
>MODE BITS A -- BIT GROUP
>MODE MOVES C -- MVP & MVN
>MODE JUMPS E -- JUMP GROUP
>MODE ROCKB 10 -- ROCKWELL BIT OPS
>MODE ROCKC 12 -- ROCKWELL BIT OPS
>MODE XN 14 -- SWEET 16 REGISTER OPS
>MODE POP 16 -- SWEET 16 POP & POPD
>MODE SET 18 -- SWEET 16 SET
>MODE CRS 1A -- COP, REP, SEP
*--------------------------------
OP.SNGL
EMIT.OPBASE
LDA OPBASE
JMP ASM65816.EMIT
*--------------------------------
OP.CRS JSR ASM65816.GNNB
CMP #'#'
BNE ERBA.E2
JSR ASM65816.EXP1
JMP EMIT.OP.AND.EXP.BYTE
ERBA.E2
JMP ERBA.EMIT.TWO
*--------------------------------
OP.COPS
JSR GENERAL.OPERAND
JSR SEE.IF.MODE.LEGAL.AT.LEVEL
LDA MODE.BYTE ALL INDIRECT MODES <<<12-16-85>>>
AND #$04 REQUIRE ZP VALUE <<<12-16-85>>>
BEQ .1 ...NOT INDIRECT <<<12-16-85>>>
CPY #14
BCC .4 ...MODES 0...13
DEC ADDR.LENGTH SHORTEN >(ZP) AND >(ZP),Y
.4 JSR ASM65816.TEST.EXP.VALUE.ZP
BNE ERBA.E2 ...MUST BE DIRECT VALUE
.1 LDA ADDR.MODE.BITS.CLASS.1,Y
BPL .2 VALID MODE
INC ADDR.LENGTH ...DIRECT,Y NOT VALID
LDA ADDR.MODE.BITS.CLASS.1+1,Y
.2 EOR OPBASE
CMP #$89 STA IMMED?
BEQ ERBA.E2 ...YES, NO SUCH ANIMAL
* FALL INTO EMIT.OP.AND.VALUE ***
*--------------------------------
EMIT.OP.AND.VALUE
JSR ASM65816.EMIT
ASM65816.EMIT.VALUE
JSR EMIT.EXP.BYTE
DEC ADDR.LENGTH
BEQ .2
LDA EXP.VALUE+1
JSR ASM65816.EMIT
DEC ADDR.LENGTH
BEQ .2
LDA EXP.VALUE+2
JSR ASM65816.EMIT
DEC ADDR.LENGTH
BEQ .2
LDA EXP.VALUE+3
JSR ASM65816.EMIT
.2 RTS
*--------------------------------
OP.BITS
JSR GENERAL.OPERAND
JSR SEE.IF.MODE.LEGAL.AT.LEVEL
CPY #7 ONLY MODES 0...6 LEGAL
BCS .2 ...NOT VALID MODE
LDX OPBASE
BNE .0 ...NOT BIT OPCODE
LDA LEVEL.MASK
AND #$20
BNE .0 ...AT LEAST 65C02
LDA #$60 ONLY ZP AND ABS LEGAL
BNE .7 ...ALWAYS
.0 LDA CLASS.5.LEGAL.MODES,X
.7 AND CLASS.5.MODE.MASKS,Y
BNE .4 ...LEGAL
LDA PASS
BEQ .1 ...IN PASS 1
JSR ASM65816.TEST.EXP.VALUE.ZP
BNE .2 ...TOO BIG FOR ZP
.1 DEY CHANGE ABS TO ZP MODE
BMI .2 ...WASN'T ABS
TYA
LSR
BCC .2 ...WASN'T ABS
LDA CLASS.5.LEGAL.MODES,X
AND CLASS.5.MODE.MASKS,Y
BNE .3 ...LEGAL AFTERALL
.2 JMP ERBA.EMIT.TWO INVALID ADDRESS MODE
.3 DEC ADDR.LENGTH
*---FORM OPCODE------------------
.4 LDA ADDR.MODE.BITS.CLASS.5,Y
EOR CLASS.5.OPS,X
LDY #$89
CMP #$20
BEQ .5
LDY #$9C
CMP #$6C
BEQ .5
LDY #$9E
CMP #$7C
BNE .6
.5 TYA
.6 JMP EMIT.OP.AND.VALUE
*--------------------------------
OP.SHIFTS
JSR ASM65816.GNC CHECK FOR ACCUMULATOR MODE
BNE .2 NOT ACCUM MODE
JSR ASM65816.GNC
BNE .2 NOT ACCUM MODE
*---ACCUMULATOR MODE-------------
LDA OPBASE
EOR #$08 MAKE ACCUM MODE OPCODE
BPL .1 NOT INC OR DEC
PHA
LDA LEVEL.MASK
AND #$20 ONLY IN 65C02 AND ABOVE
BEQ .5
PLA
EOR #$F0 CHANGE EA-->1A, CA-->3A
.1 JMP ASM65816.EMIT
*---MODES WITH OPERAND FIELD-----
.2 DEC CHAR.PNTR
JSR GENERAL.OPERAND
JSR SEE.IF.MODE.LEGAL.AT.LEVEL
CPY #5 ONLY MODES 1...4 LEGAL
BCS .5
TYA
BEQ .5 ...NO IMMEDIATE MODE ALLOWED
LDA ADDR.MODE.BITS.CLASS.1,Y
EOR OPBASE
JMP EMIT.OP.AND.VALUE
.5 JMP ERBA.EMIT.TWO INVALID ADDRESS MODE
*--------------------------------
OP.REL8
.DO SWEET.16
LDA OPBASE CHECK FOR 'BNM1' SWEET-16 OP
CMP #$09
BNE .1 ...NOT 'BNM1'
JSR ASM65816.GNC CHECK FOR '1'
CMP #'1'
BNE BADOPERR ...NO, SO BAD OP
.FIN
.1 JSR ASM65816.EXPR
LDA OPBASE
OP.REL8.A
JSR ASM65816.EMIT EMIT OPCODE
LDA EXP.UNDEF
BMI GOEMIT ...UNDEFINED
LDY EXP.VALUE+1
CLC COMPUTE RELATIVE OFFSET
LDA EXP.VALUE
SBC ORGN
STA EXP.VALUE
BPL .2
INY
.2 TYA
SBC ORGN+1
BNE ERR.RANGE.EMIT.ONE
EMIT.EXP.BYTE
LDA EXP.VALUE
GOEMIT JMP ASM65816.EMIT
*--------------------------------
BADOPERR
LDA #ERR.BAD.OPCODE
JMP ASM65816.ASM.ERROR
*--------------------------------
* BRL & PER, 16-bit relative
*--------------------------------
OP.REL16
JSR ASM65816.EXPR Get value of expression
JSR EMIT.OPBASE Emit the opcode, bumping origin once
LDA EXP.UNDEF If undefined, say so
BMI .3 (If we didn't, might be RANGE ERR)
CLC ADD 2 MORE TO ORIGIN
LDY ORGN+2
LDA ORGN
ADC #2
STA EXP.VALUE+3 (TEMP)
LDA ORGN+1
ADC #0
BCC .2
INY BANK BYTE
.2 CPY EXP.VALUE+2 IN SAME BANK AS TARGET?
BNE ERR.RANGE.EMIT.TWO ...NO, ERR RANGE
STA EXP.VALUE+2 YES, SAVE IN ANOTHER TEMP
LDA EXP.VALUE TARGET-ORGN+3
SBC EXP.VALUE+3
STA EXP.VALUE
LDA EXP.VALUE+1
SBC EXP.VALUE+2
STA EXP.VALUE+1
.3 LDA #2
STA ADDR.LENGTH
JMP ASM65816.EMIT.VALUE
*--------------------------------
ERR.RANGE.EMIT.TWO
JSR ASM65816.EMIT.ZERO
ERR.RANGE.EMIT.ONE
JSR ASM65816.EMIT.ZERO
ASM65816.RAER
LDA #ERR.RANGE
JMP ASM65816.ASM.ERROR
*--------------------------------
OP.MOVES
JSR EMIT.OPBASE
JSR ASM65816.EXPR GET SOURCE BANK
LDA EXP.VALUE+2
PHA
JSR ASM65816.GNC
CMP #',' MUST HAVE COMMA HERE
BNE .1 ...ILLEGAL
JSR ASM65816.EXP1 GET DESTINATION BANK
LDA EXP.VALUE+2
JSR ASM65816.EMIT
PLA
JMP ASM65816.EMIT
.1 JMP ERBA.EMIT.TWO
*--------------------------------
OP.JUMPS
JSR GENERAL.OPERAND
LDA LEGAL.JUMP.MODES,Y
BMI .4 ...ILLEGAL
ORA OPBASE
TAY
LDA LEVEL.MASK
BMI .1 65816, ALLOW ALL MODES
CPY #5 DISALLOW JML, JSL, AND PEA
BCS .4 ...ONE OF THOSE
CPY #1 DISALLOW JMP LONG
BEQ .4
AND #$20 SEE IF 65C02
BNE .1 ...YES
CPY #3 ...NO, DISALLOW JMP (ABS,X)
BEQ .4 ...THAT'S WHAT IT IS...
.1 LDA JUMP.OPCODES,Y
BEQ .4 ...ILLEGAL
LDY #2 ASSUME TWO BYTE ADDRESS
CMP #$5C CHECK FOR "JMP LONG"
BEQ .2 ...YES, 3 BYTES OF ADDRESS
CMP #$22 CHECK FOR "JSL"
BNE .3 ...NO, ONLY 2 BYTES OF ADDRESS
.2 INY 3 BYTE ADDRESS
.3 STY ADDR.LENGTH
JMP EMIT.OP.AND.VALUE
.4 JMP ERBA.EMIT.TWO
*--------------------------------
ASM65816.TEST.EXP.VALUE.ZP
LDA EXP.VALUE+1
ORA EXP.VALUE+2
ORA EXP.VALUE+3
RTS
*--------------------------------
LONG.INDIRECT
JSR ASM65816.EXP1
JSR ASM65816.GNC
CMP #']'
BNE ERBA.EMIT.TWO
JSR ASM65816.GNC
BEQ .1 ...[EXP]
CMP #','
BNE ERBA.EMIT.TWO
JSR ASM65816.GNC.UC
CMP #'Y'
BNE ERBA.EMIT.TWO
LDA #$47 ...[EXP],Y
.HS 2C
.1 LDA #$44 ...[EXP],Y
STA MODE.BYTE
LDA #2
STA ADDR.LENGTH
JMP CHECK.IF.SUFFIX.LEGAL
*--------------------------------
IMMEDIATE
JSR ASM65816.GNC.UC
CMP DLIM 16-BIT IMMEDIATE?
BNE .1 ...NO, BACKUP
LDA LEVEL.MASK 16-BIT IMMEDIATE OKAY?
BPL ERBA.EMIT.TWO ...NOT AT 65816 LEVEL
INC ADDR.LENGTH ...YES, INCREASE LENGTH
BNE .2 ...ALWAYS
.1 DEC CHAR.PNTR
.2 JSR ASM65816.EXP1
JSR ASM65816.GNC
BNE ERBA.EMIT.TWO ILLEGAL
LDA DLIM
CMP #'/' #=23, /=2F, ^=5E
BCC .4 ...#
BEQ .3 .../
JSR ASM65816.EXP.OVER.256 ...^
.3 JSR ASM65816.EXP.OVER.256
.4 LDY #0 SIGNAL IMMEDIATE MODE
STY MODE.BYTE COPS NEEDS THIS <<<12-16-85>>>
RTS
*--------------------------------
ERBA.EMIT.THREE
JSR ASM65816.EMIT.ZERO
ERBA.EMIT.TWO
JSR ASM65816.EMIT.ZERO
JSR ASM65816.EMIT.ZERO
ASM65816.ERBA
LDA #ERR.BAD.ADDRESS
JMP ASM65816.ASM.ERROR
ASM65816.EMIT.ZERO LDA #0
JMP ASM65816.EMIT
*--------------------------------
* RETURN:
* # BYTES IN ADDRESS IN ADDR.LENGTH
* (Y) = INDEX TO ADDR.MODE.BITS
*--------------------------------
GENERAL.OPERAND
JSR ASM65816.GNNB GET NEXT NON-BLANK
BCS ERBA.EMIT.TWO ...NO OPERAND
*---PARSE PREFIX-----------------
LDY #1
STY ADDR.LENGTH
STA DLIM
CMP #'('
BEQ .3 ...indirect, must be ZP
CMP #'['
BEQ LONG.INDIRECT
CMP #'#'
BEQ IMMEDIATE
CMP #'/'
BEQ IMMEDIATE
CMP #'^'
BEQ IMMEDIATE
CMP #'<'
BEQ .3 MAKE FORCE SIZE = 1
DEY Y=0
CMP #'>'
BNE .2 ...SIZE NOT FORCED
JSR ASM65816.GNC
LDY #3 Y=3
CMP DLIM IS IT ">>"?
BEQ .3 ...YES
DEY Y=2
STA DLIM CHANGE DLIM TO NEW VALUE
CMP #'(' IS IT (?
BEQ .3 ...YES, >(
.2 DEC CHAR.PNTR ...NO, SO BACKUP
.3 STY FORCE.ADDR.SIZE
*---PARSE THE EXPRESSION---------
JSR ASM65816.EXP1
*---FIGURE # OF BYTES------------
LDX FORCE.ADDR.SIZE
BNE .6 ...FORCED WITH <, >, OR >>
LDX #2 ASSUME 2-BYTE ADDRESS
LDA EXP.UNDEF
BMI .6
LDA PASS IGNORE FWD REF FLAG IN PASS 1
BEQ .4 ...PASS 1
LDA EXP.FWDREF ...PASS 2, DEFINED
BNE .4 ...BUT NOT FWD REF
LDA EXP.VALUE+3 ...FWD REF MUST BE ONLY
ORA EXP.VALUE+2 16 BITS
BEQ .6 ...IT FITS!
BNE ERBA.1 ...ALWAYS, ERBA
.4 LDA EXP.VALUE+3 DO NOT ALLOW 32-BITS
BNE ERBA.1 ...BAD ADDR
LDA EXP.VALUE+2
BNE .5 ...3-BYTE ADDRESS
DEX X=1
LDA EXP.VALUE+1
BEQ .6 ...ZP
.5 INX
.6 STX ADDR.LENGTH
*---PARSE SUFFIX-----------------
DEX MAKE 0, 1, OR 2
STX MODE.BYTE
LDX #6
.7 JSR ASM65816.GNC.UC
.8 CMP MODE.CHARS,X
BEQ .9
CLC
ROL MODE.BYTE
DEX
BPL .8
BMI ERBA.1
.9 CMP #' ' BLANK?
BEQ CHECK.IF.SUFFIX.LEGAL ...YES, END OF OPERAND
CMP #')' RIGHT PAREN?
BNE .10 ...NO
LDA DLIM WAS THERE A LEFT PAREN?
CMP #'('
BNE ERBA.1 ...NO
.10 SEC
ROL MODE.BYTE
DEX
BPL .7
ERBA.1 JMP ERBA.EMIT.TWO ILLEGAL
*--------------------------------
CHECK.IF.SUFFIX.LEGAL
LDY #0 SEARCH FORWARD FOR VARIOUS REASONS
LDA MODE.BYTE
.13 INY
CPY #MODE.TABLE.SIZE+1
BCS ERBA.1 ...END OF TABLE
CMP MODE.TABLE-1,Y
BNE .13 ...KEEP LOOKING
RTS
*--------------------------------
SEE.IF.MODE.LEGAL.AT.LEVEL
LDA LEVEL.MASK
BMI .15 ...65816 LEVEL, ALL LEGAL
CPY #9
BCC .15 ...6502 MODES
BEQ .14 ...65C02 MODE
CPY #16
BNE ERBA.1
.14 AND #$20 AT C02 LEVEL?
BEQ ERBA.1 ...NO
.15 RTS
*--------------------------------
ASM65816.EXP.OVER.256
LDA EXP.VALUE+1
STA EXP.VALUE
LDA EXP.VALUE+2
STA EXP.VALUE+1
LDA EXP.VALUE+3
STA EXP.VALUE+2
LDA #0
STA EXP.VALUE+3
RTS
.DO ROCKWELL
*--------------------------------
* ROCKWELL 65C02 EXCLUSIVES
*
* RMB bit#,zp
* SMB bit#,zp
* BBR bit#,zp,reladdr
* BBS bit#,zp,reladdr
*--------------------------------
OP.ROCKB
JSR OP.ROCKWELL
JSR ASM65816.GNC REQUIRE A COMMA
CMP #','
BNE .1 ...NO COMMA
LDA EXP.VALUE
PHA SAVE ZP VALUE
JSR ASM65816.EXP1 GET BRANCH EXPRESSION
JSR EMIT.OPBASE <<<12-16-85>>>
PLA
JMP OP.REL8.A
.1 JMP ERBA.EMIT.THREE
*--------------------------------
OP.ROCKC
JSR OP.ROCKWELL
.FIN
EMIT.OP.AND.EXP.BYTE
JSR EMIT.OPBASE <<<12-16-85>>>
JMP EMIT.EXP.BYTE <<<12-16-85>>>
*--------------------------------
.DO ROCKWELL
OP.ROCKWELL
JSR ASM65816.EXPR GET BIT #
JSR ASM65816.TEST.EXP.VALUE.ZP
BNE .1 ...MUST BE SMALL NUMBER!
LDA EXP.VALUE
CMP #8 MUST BE 0...7
BCS .1 ...TOO LARGE
ASL
ASL
ASL
ASL
ORA OPBASE MERGE INTO OPCODE
STA OPBASE
JSR ASM65816.GNC NEED A COMMA NOW
CMP #','
BNE .1
JSR ASM65816.EXP1 GET ZP VALUE
JSR ASM65816.TEST.EXP.VALUE.ZP
BNE .1 MUST BE ZERO PAGE
RTS
.1 JMP ERBA.EMIT.TWO
*--------------------------------
.ELSE
OP.ROCKB
OP.ROCKC
JMP BADOPERR
.FIN
.DO SWEET.16
*--------------------------------
* SWEET-16 OPCODES
*--------------------------------
OP.POP
JSR ASM65816.GNC.UC SEE WHICH: POP OR POPD
BEQ OP.XN ...POP
CMP #'D'
BEQ .1
JMP BADOPERR
.1 LDA #$A2 ...POP
STA OPBASE
*--------------------------------
OP.XN
JSR ASM65816.GNNB
BCS SWEET.ERBA
CMP #'@'
BNE .1 ...NOT '@N'
LDA OPBASE ...'@N', SEE IF LEGAL
AND #2
BEQ SWEET.ERBA ...NOT LEGAL WITH THIS OP
LDA OPBASE ...LEGAL, ADD $20
ADC #$1F .CS., SO 1F IS 20
BNE .2 ...ALWAYS
.1 DEC CHAR.PNTR Backup character pointer
LDA OPBASE
LSR
BCC SWEET.ERBA 'N' NOT LEGAL FOR THIS OP
LDA OPBASE
.2 AND #$F0 CLEAR AWAY LEGALITY FLAGS
STA OPBASE
JSR ASM65816.EXP1 GET REGISTER NUMBER
JSR ASM65816.TEST.EXP.VALUE.ZP
BNE SWEET.RAER
LDA EXP.VALUE
CMP #$10
BCS SWEET.RAER
ORA OPBASE
JMP ASM65816.EMIT
*--------------------------------
SWEET.ERBA JMP ASM65816.ERBA
SWEET.RAER JMP ASM65816.RAER
*--------------------------------
OP.SET
JSR OP.XN
JSR ASM65816.GNC
CMP #','
BNE SWEET.ERBA
JSR ASM65816.EXP1
LDA #2
STA ADDR.LENGTH
JMP ASM65816.EMIT.VALUE
*--------------------------------
.ELSE
OP.POP
OP.XN
OP.SET
JMP BADOPERR
.FIN
*--------------------------------
LEGAL.JUMP.MODES
.HS FF.00.00.FF.FF.FF
.HS FF.FF.03.02.FF.FF
.HS 01.FF.02.FF.03
*--------------------------------
JUMP.OPCODES
.HS 4C.5C.6C.7C JMP
.HS 20.22.00.FC JSR
.HS 00.00.DC.00 JML
.HS 22.22.00.00 JSL
.HS F4.00.00.00 PEA
*--------------------------------
MODE.CHARS
.AS / Y,)SX,/
*--------------------------------
MODE.TABLE
.HS 00 1 -- DIRECT
.HS 40 2 -- ABSOLUTE
.HS 30 3 -- DIRECT,X
.HS 70 4 -- ABSOLUTE,X
.HS 21 5 -- DIRECT,Y
.HS 61 6 -- ABSOLUTE,Y
.HS 07 7 -- (DIRECT),Y
.HS 34 8 -- (DIRECT,X)
*---IN 65C02, 802, 816-----------
.HS 04 9 -- (DIRECT)
*---IN 65802, 816----------------
.HS 28 A -- ...,S
.HS 2F B -- (...,S),Y
*---ONLY IN 65816----------------
.HS 80 C -- LONG
.HS B0 D -- LONG,X
.HS 44 E -- >(DIRECT)
.HS 47 F -- >(DIRECT),Y
*---SPECIAL FOR JMP,JSR (A,X)----
.HS 74 10 -- (ABSOLUTE,X)
MODE.TABLE.SIZE .EQ *-MODE.TABLE
*--------------------------------
ADDR.MODE.BITS.CLASS.1
.HS 08 0 -- IMMEDIATE
.HS 04 1 -- DIRECT
.HS 0C 2 -- ABSOLUTE
.HS 14 3 -- DIRECT,X
.HS 1C 4 -- ABSOLUTE,X
.HS FF 5 -- DIRECT,Y <<<NOT LEGAL>>>
.HS 18 6 -- ABSOLUTE,Y
.HS 10 7 -- (DIRECT),Y
.HS 00 8 -- (DIRECT,X)
*---IN 65C02, 802, 816-----------
.HS 13 9 -- (DIRECT)
*---IN 65802, 816----------------
.HS 02 A -- ...,S
.HS 12 B -- (...,S),Y
*---ONLY IN 65816----------------
.HS 0E C -- LONG
.HS 1E D -- LONG,X
.HS 06 E -- >(DIRECT)
.HS 16 F -- >(DIRECT),Y
*--------------------------------
ADDR.MODE.BITS.CLASS.5
.HS 00 0 -- IMMEDIATE
.HS 04 1 -- DIRECT
.HS 0C 2 -- ABSOLUTE
.HS 14 3 -- DIRECT,X
.HS 1C 4 -- ABSOLUTE,X
.HS 14 5 -- DIRECT,Y
.HS 1C 6 -- ABSOLUTE,Y
*--------------------------------
CLASS.5.MODE.MASKS
.HS 80.40.20.10.08.04.02
*--------------------------------
FIRST.LETTER.TABLE
.DA #LTR.A-OPCODE.TABLE
.DA #LTR.B-OPCODE.TABLE
.DA #LTR.C-OPCODE.TABLE
.DA #LTR.D-OPCODE.TABLE
.DA #LTR.E-OPCODE.TABLE
.DA #LTR.F-OPCODE.TABLE
.DA #LTR.G-OPCODE.TABLE
.DA #LTR.H-OPCODE.TABLE
.DA #LTR.I-OPCODE.TABLE
.DA #LTR.J-OPCODE.TABLE
.DA #LTR.K-OPCODE.TABLE
.DA #LTR.L-OPCODE.TABLE
.DA #LTR.M-OPCODE.TABLE
.DA #LTR.N-OPCODE.TABLE
.DA #LTR.O-OPCODE.TABLE
.DA #LTR.P-OPCODE.TABLE
.DA #LTR.Q-OPCODE.TABLE
.DA #LTR.R-OPCODE.TABLE
.DA #LTR.S-OPCODE.TABLE
.DA #LTR.T-OPCODE.TABLE
.DA #LTR.U-OPCODE.TABLE
.DA #LTR.V-OPCODE.TABLE
.DA #LTR.W-OPCODE.TABLE
.DA #LTR.X-OPCODE.TABLE
.DA #LTR.Y-OPCODE.TABLE
.DA #LTR.Z-OPCODE.TABLE
*--------------------------------
* TWO KINDS OF ENTRIES, DISTINGUISHED BY FIRST BIT:
* 8-BIT ENTRIES: FIRST BIT = 0
* 24-BIT ENTRIES: FIRST BIT = 1
*
* FIRST ENTRY AT EACH LETTER IS AN 8-BIT ENTRY.
* EACH 8-BIT ENTRY IS FOLLOWED BY ONE OR MORE
* 24-BIT ENTRIES.
* THE SUB-LIST OF 24-BIT ENTRIES IS TERMINATED
* BY THE NEXT 8-BIT ENTRY.
* THE LIST OF 8-BIT ENTRIES IS TERMINATED BY
* AN 8-BIT ENTRY WITH BIT 6 = 1.
*
* THE VALUE OF BITS 5-0 IN AN 8-BIT ENTRY
* IS THE DIMINISHED ASCII CODE FOR THE
* SECOND LETTER OF AN OPCODE.
* THE VALUE OF BITS 5-0 OF A 24-BIT ENTRY
* IS THE DIMINISHED ASCII CODE FOR THE
* THIRD LETTER OF AN OPCODE.
* A...Z = $81...9A
* BLANK = $E0
* '1' = $F1
* THE VALUE OF THE SECOND BYTE OF A 24-BIT
* ENTRY IS AN OPCODE BASE.
* THE THIRD BYTE OF A 24-BIT ENTRY HAS TWO PARTS:
* BITS 4-1 ARE AN INDEX TO THE OP.MODE
* JUMP TABLE IN ASM.65816
* BITS 7-5 AND 0 ARE LEVEL MASK BITS.
* 000XXXX0 = 6502 OPCODE
* 000XXXX1 = SWEET-16
* 001XXXX0 = 65C02
* 010XXXX0 = ROCKWELL SPECIALS
* 100XXXX0 = 65816
*
* LEVEL.MASK = $00 FOR 6502
* = $20 FOR 65C02
* = $60 FOR ROCKWELL C02
* = $A0 FOR 65816
*--------------------------------
OP..1 .SE 0
OP..2 .SE 0
.MA OP
.DO "]1"=OP..1=0
LTR.]1 .DA #"]2"-$80 bits 76 = 01
OP..1 .SE "]1"
OP..2 .SE "]2"
.ELSE
.DO "]2"=OP..2=0
.DA #"]2"-$C0 bits 76 = 00
OP..2 .SE "]2"
.FIN
.FIN
.DA #"]3"^$40,#$]4,#O..]5!O..]6 bits 76 = 10 or 11
.EM
*--------------------------------
O..65816 .EQ $80
O..65R02 .EQ $40
O..65C02 .EQ $20
O..SWEET .EQ $01
O.. .EQ $00
*--------------------------------
OPCODE.TABLE
LTR.F
LTR.G
LTR.H
LTR.K
LTR.Q
LTR.U
LTR.V
LTR.Y
LTR.Z .HS 00
*--------------------------------
>OP A,D,C,61,COPS
>OP A,D,D,A1,XN,SWEET
>OP A,N,D,21,COPS
>OP A,S,L,02,SHIFTS
>OP B,C,C,90,REL8
>OP B,C,S,B0,REL8
>OP B,C," ",03,REL8,SWEET
>OP B,E,Q,F0,REL8
>OP B,G,E,B0,REL8
>OP B,I,T,00,BITS
>OP B,L,T,90,REL8
>OP B,M,I,30,REL8
>OP B,M," ",05,REL8,SWEET
>OP B,M,1,08,REL8,SWEET
>OP B,N,E,D0,REL8
>OP B,N,C,02,REL8,SWEET
>OP B,N,M,09,REL8,SWEET (BNM1)
>OP B,N,Z,07,REL8,SWEET
>OP B,P,L,10,REL8
>OP B,P," ",04,REL8,SWEET
>OP B,R,A,80,REL8,65C02
>OP B,R,K,00,SNGL
>OP B,R,L,82,REL16,65816
>OP B,R," ",01,REL8,SWEET
>OP B,V,C,50,REL8
>OP B,V,S,70,REL8
>OP B,B,R,0F,ROCKB,65R02
>OP B,B,S,8F,ROCKB,65R02
>OP B,K," ",0A,SNGL,SWEET
>OP B,S," ",0C,REL8,SWEET
>OP B,Z," ",06,REL8,SWEET
>OP C,L,C,18,SNGL
>OP C,L,D,D8,SNGL
>OP C,L,I,58,SNGL
>OP C,L,V,B8,SNGL
>OP C,M,P,C1,COPS
>OP C,O,P,02,CRS,65816
>OP C,P,X,04,BITS
>OP C,P,Y,03,BITS
>OP C,P,R,D1,XN,SWEET
>OP D,E,C,C2,SHIFTS
>OP D,E,X,CA,SNGL
>OP D,E,Y,88,SNGL
>OP D,C,R,F1,XN,SWEET
>OP E,O,R,41,COPS
>OP I,N,C,E2,SHIFTS
>OP I,N,X,E8,SNGL
>OP I,N,Y,C8,SNGL
>OP I,N,R,E1,XN,SWEET
>OP J,M,L,08,JUMPS,65816
>OP J,M,P,00,JUMPS
>OP J,S,L,0C,JUMPS,65816
>OP J,S,R,04,JUMPS
>OP L,D,A,A1,COPS
>OP L,D,X,02,BITS
>OP L,D,Y,01,BITS
>OP L,D," ",23,XN,SWEET
>OP L,D,D,42,XN,SWEET
>OP L,S,R,42,SHIFTS
>OP M,V,N,54,MOVES,65816
>OP M,V,P,44,MOVES,65816
>OP N,O,P,EA,SNGL
>OP O,R,A,01,COPS
>OP P,E,A,10,JUMPS,65816
>OP P,E,I,0A,BITS,65816
>OP P,E,R,62,REL16,65816
>OP P,H,A,48,SNGL
>OP P,H,B,8B,SNGL,65816
>OP P,H,D,0B,SNGL,65816
>OP P,H,K,4B,SNGL,65816
>OP P,H,P,08,SNGL
>OP P,H,X,DA,SNGL,65C02
>OP P,H,Y,5A,SNGL,65C02
>OP P,L,A,68,SNGL
>OP P,L,B,AB,SNGL,65816
>OP P,L,D,2B,SNGL,65816
>OP P,L,P,28,SNGL
>OP P,L,X,FA,SNGL,65C02
>OP P,L,Y,7A,SNGL,65C02
>OP P,O,P,62,POP,SWEET (POP,POPD)
>OP R,E,P,C2,CRS,65816
>OP R,O,L,22,SHIFTS
>OP R,O,R,62,SHIFTS
>OP R,T,I,40,SNGL
>OP R,T,L,6B,SNGL,65816
>OP R,T,S,60,SNGL
>OP R,T,N,00,SNGL,SWEET
>OP R,M,B,07,ROCKC,65R02
>OP R,S," ",0B,SNGL,SWEET
>OP S,B,C,E1,COPS
>OP S,E,C,38,SNGL
>OP S,E,D,F8,SNGL
>OP S,E,I,78,SNGL
>OP S,E,P,E2,CRS,65816
>OP S,E,T,11,SET,SWEET
>OP S,T,A,81,COPS
>OP S,T,P,DB,SNGL,65816
>OP S,T,P,72,XN,SWEET
>OP S,T,X,06,BITS
>OP S,T,Y,05,BITS
>OP S,T,Z,07,BITS,65C02
>OP S,T," ",33,XN,SWEET
>OP S,T,D,52,XN,SWEET
>OP S,U,B,B1,XN,SWEET
>OP S,M,B,87,ROCKC,65R02
>OP T,A,X,AA,SNGL
>OP T,A,Y,A8,SNGL
>OP T,C,D,5B,SNGL,65816
>OP T,C,S,1B,SNGL,65816
>OP T,D,C,7B,SNGL,65816
>OP T,R,B,09,BITS,65C02
>OP T,S,B,08,BITS,65C02
>OP T,S,C,3B,SNGL,65816
>OP T,S,X,BA,SNGL
>OP T,X,A,8A,SNGL
>OP T,X,S,9A,SNGL
>OP T,X,Y,9B,SNGL,65816
>OP T,Y,A,98,SNGL
>OP T,Y,X,BB,SNGL,65816
>OP W,A,I,CB,SNGL,65816
>OP W,D,M,42,SNGL,65816
>OP X,B,A,EB,SNGL,65816
>OP X,C,E,FB,SNGL,65816
.HS 40 <<<TERMINATOR>>>
*--------------------------------
CLASS.5.OPS
* BIT LDY LDX CPY CPX STY STX STZ
.HS 20..A0..A2..C0..E0..80..82..60
*
* TSB TRB PEI
.HS 00..10..D0
*
CLASS.5.LEGAL.MODES
.HS F8..F8..E6..E0..E0..70..64..78
.HS 60..60..40
*
* 80 -- IMMEDIATE
* 40 -- DIRECT
* 20 -- ABSOLUTE
* 10 -- DIRECT,X
* 08 -- ABSOLUTE,X
* 04 -- DIRECT,Y
* 02 -- ABSOLUTE,Y
* 01 -- <<<NOT USED>>>
*--------------------------------
* OPCODE TABLE SELECTION
* .OP 6502/65C02/R65C02/65816/SWEET16,...
*--------------------------------
DIR.OP LDA #0
STA LEVEL.MASK
LDA #15
STA EMIT.MARGIN
.1 JSR ASM65816.GNC.UC GET NEXT CHARACTER
BCS .5 END
LDY #-2
.2 INY
INY
LDA PSOP.TABLE,Y
BEQ .1 ...END OF TABLE, TRY NEXT CHARACTER
CMP CURRENT.CHAR
BNE .2 ...NOT THIS ONE
.3 LDA PSOP.TABLE+1,Y
STA LEVEL.MASK
BPL .5
LDA #18
STA EMIT.MARGIN
.5 RTS RETURN TO ASSEMBLER
*--------------------------------
PSOP.TABLE
.DA #'8',#$A0 65816 = $A0
.DA #'C',#$20 65C02 = $20
.DO ROCKWELL
.DA #'R',#$60 ROCKWELL= $60
.FIN
.DO SWEET.16
.DA #'S',#$01 SWEET-16= $01
.FIN
.DA #0
*--------------------------------------
MAN
SAVE usr/src/scmasm.31/asm65816.s
LOAD usr/src/scmasm.31/scmasm.s
ASM
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