mirror of
https://github.com/A2osX/A2osX.git
synced 2024-11-26 13:49:18 +00:00
1127 lines
18 KiB
Plaintext
1127 lines
18 KiB
Plaintext
NEW
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PREFIX /A2OSX.BUILD
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AUTO 4,1
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*---------------------------------------
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SRC.ParseLine jsr OUT.Reset
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jsr SRC.GetChar
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bcs .8
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cmp #'*' Comment?
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beq .8
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cmp #';' Comment?
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beq .8
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>LDA.G ASM.DO.StackPtr
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beq .1
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clc
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adc #ASM.DO.Stack-1
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tay
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lda (pData),y
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beq .8
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.1 >LDA.G ASM.MA.ON
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bmi SRC.ParseLine.MACRO
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jmp SRC.ParseLine.LABEL
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.8 clc
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rts
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*---------------------------------------
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SRC.ParseLine.Macro
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lda (ZPLinePtr)
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cmp #' ' No label, scan to DIR/OP if any
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bne .1
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jsr SRC.GetNextCharNB
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bcs .8
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lda #' ' Store ONE blank
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jsr MAC.AddChar
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bcs .90
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lda (ZPLinePtr) get back non blank char
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bra .2
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.1 jsr MAC.AddChar
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bcs .99
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jsr SRC.GetNextChar
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bcs .80
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cmp #' '
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bne .1
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jsr MAC.AddChar
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.90 bcs .99
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jsr SRC.GetNextCharNB
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bcs .80
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.2 cmp #'.' Directive ?
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bne .4
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ldy #1
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lda (ZPLinePtr),y
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beq .3
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cmp #'E'
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beq .21
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cmp #'e'
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bne .3
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.21 iny
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lda (ZPLinePtr),y
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beq .3
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cmp #'M'
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beq .22
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cmp #'m'
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bne .3
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.22 jsr MAC.Store
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bcs SRC.ParseLine.RTS
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>STZ.G ASM.MA.ON
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.8 clc
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rts
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.80 lda #0
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jmp MAC.AddChar
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.3 lda (ZPLinePtr)
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.4 jsr MAC.AddChar
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bcs .99
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jsr SRC.GetNextChar
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bcs .80
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cmp #' '
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bne .4
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jsr SRC.GetNextChar
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bcs .8
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cmp #' '
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beq .80 Comments...
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pha
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lda #' '
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jsr MAC.AddChar
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pla
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bcs .99
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.5 jsr MAC.AddChar Store ARG....
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bcs .99
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jsr SRC.GetNextChar
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bcs .80
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cmp #' '
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bne .5
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lda #0
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jmp MAC.AddChar End of Line
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clc
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rts
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.99 lda #ERR.MACRO.TOO.BIG
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sec
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SRC.ParseLine.RTS
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rts
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*---------------------------------------
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SRC.ParseLine.LABEL
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jsr SRC.GetChar
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cmp #' ' no label...go scan dir/opcode
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beq SRC.ParseLine.DirOp
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cmp #'.' local symbol?
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bne .1
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lda (ZPGlobalBuf) Not relative to Global label...
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beq SRC.ParseLine.InvLbl
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jsr SRC.GetNextChar
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bcs SRC.ParseLine.InvLbl
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jsr SRC.GetDecimal
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bcs SRC.ParseLine.InvLbl
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lda SRC.ACC+1
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ora SRC.ACC+2
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ora SRC.ACC+3
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bne SRC.ParseLine.InvLbl Max .255
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lda SRC.ACC
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beq SRC.ParseLine.InvLbl .0 is not allowed
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jsr SYM.NewOrGetLocalA
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bcs SRC.ParseLine.RTS
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bra SRC.ParseLine.DirOp
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.1 jsr SYM.FlushGlobal Close & store Previous Global
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bcs SRC.ParseLine.RTS
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jsr SYM.NewOrGetGlobal
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bcs SRC.ParseLine.RTS
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*---------------------------------------
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SRC.ParseLine.DirOp
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jsr SRC.GetNextCharNB Scan for an Opcode...
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bcs SRC.ParseLine.Ok
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cmp #'.'
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bne .5
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jsr SRC.GetNextChar
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bcs SRC.ParseLine.InvDir
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jsr SRC.ParseLine.Dir
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bcs SRC.ParseLine.Err
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bra SRC.ParseLine.Ok
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.5 cmp #'>'
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bne SRC.ParseLine.OpCode
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jsr SRC.ParseLine.ExecMacro
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bcs SRC.ParseLine.Err
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bra SRC.ParseLine.Ok
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SRC.ParseLine.Ok
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clc
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SRC.ParseLine.Err
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rts
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SRC.ParseLine.InvLbl
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lda #ERR.INV.LABEL
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sec
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rts
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SRC.ParseLine.InvDir
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lda #ERR.INV.DIR
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sec
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rts
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*---------------------------------------
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SRC.ParseLine.Dir
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>LDYA L.T.DIRECTIVES
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jsr SRC.GetKeyword
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bcs SRC.ParseLine.InvDir
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jmp (J.DIRECTIVES,x)
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*---------------------------------------
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SRC.ParseLine.ExecMacro
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jsr SRC.GetNextChar skip '>'
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bcs .90
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jsr MAC.Lookup
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bcs .90
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>LDA.G ASM.MA.StackPtr
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cmp #MA.MAXDEPTH
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beq .91
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clc
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adc #ASM.MA.StackPtr
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tay
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>INC.G ASM.MA.StackPtr
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clc
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rts
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.90 lda #ERR.MACRO.INV
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sec
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rts
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.91 lda #ERR.MACRO.INV
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sec
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rts
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*---------------------------------------
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SRC.ParseLine.OpCode
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stz SRC.AM.StrBuf
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>LDYA ZPOpsPtr
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>STYA ZPOpDefPtr
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.1 lda (ZPOpDefPtr) End Of OpCode List
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ldy #1
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ora (ZPOpDefPtr),y
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beq .9
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lda ZPOpDefPtr
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clc
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adc #2
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sta ZPPtr2
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lda ZPOpDefPtr+1
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adc #0
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sta ZPPtr2+1
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lda (ZPPtr2)
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tax
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ldy #0
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.2 lda (ZPLinePtr),y
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beq .7
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cmp #'a'
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bcc .3
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cmp #'z'+1
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bcs .3
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eor #$20
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.3 iny
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cmp (ZPPtr2),y
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bne .7
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dex
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bne .2
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lda (ZPLinePtr),y
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beq .8 End of Line, no AM
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cmp #' ' A space after opcode ?
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bne .7
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tya
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sec skip OP + ' '
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adc ZPLinePtr
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sta ZPLinePtr
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bcc .5
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inc ZPLinePtr+1
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.5 bra SRC.ParseLine.AM
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.7 lda ZPOpDefPtr
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clc
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adc (ZPOpDefPtr)
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tax
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lda ZPOpDefPtr+1
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ldy #1
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adc (ZPOpDefPtr),y
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stx ZPOpDefPtr
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sta ZPOpDefPtr+1
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bra .1
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.8 jmp SRC.ParseLine.OPAMCheckFF
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.9 lda #ERR.INV.OPCODE
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sec
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.99 rts
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*---------------------------------------
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SRC.ParseLine.AM
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.1 jsr SRC.GetChar
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bcs SRC.ParseLine.AMCheck
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.10 cmp #' ' another space ?
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beq SRC.ParseLine.AMCheck ignore end of line (comment)
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jsr SRC.IsAMReserved
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bcs .2
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jsr SRC.AddToBuf
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bra .7
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.2 jsr SRC.IsLetter Any register?
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bcs .6 no, try something else
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>LDYA ZPRPtr Check in register table
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jsr SRC.GetKeyword
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bcs .6
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lda (ZPPtr1) get register len
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tax
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.4 inc ZPPtr1
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bne .5
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inc ZPPtr1+1
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.5 lda (ZPPtr1)
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jsr SRC.AddToBuf
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dex
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bne .4
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bra .1
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.6 jsr EXP.Eval
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bcs .99
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>LDA.G EXP.Prefix
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beq .75
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jsr SRC.AddToBuf
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.75 ldx #2
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.74 lda SRC.ACC.SIZE
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beq .72 Pending...assume 2 bytes...
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tax
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.73 lda SRC.ACC-1,x
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bne .72
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dex
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bne .73
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inx
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.72 lda #'a'
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.71 jsr SRC.AddToBuf
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dex
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bne .71
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bra .1
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.7 jsr SRC.GetNextChar
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bcc .10
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jmp SRC.ParseLine.AMCheck
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.9 lda #ERR.INV.AM.SYN
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sec
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.99 rts
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*---------------------------------------
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SRC.ParseLine.AMCheck
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* jsr OUT.PrintLine.1
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* >PUSHW L.SRC.AM.StrBuf
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* >LDYA L.MSG.PSTRCRLF
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* >SYSCALL PrintF.YA
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* >DEBUG
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lda SRC.AM.StrBuf
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beq SRC.ParseLine.OPAMCheckFF
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>LDYA ZPAMPtr
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>STYA ZPPtr1
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ldx #0
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.1 inx
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lda (ZPPtr1)
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beq .9
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cmp SRC.AM.StrBuf
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bne .7
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tay
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.2 lda (ZPPtr1),y
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cmp SRC.AM.StrBuf,y
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bne .6
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dey
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bne .2
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txa
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>STA.G SRC.AMID
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bra SRC.ParseLine.OPAMCheck
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.6 lda (ZPPtr1)
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.7 sec
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adc ZPPtr1
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sta ZPPtr1
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bcc .1
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inc ZPPtr1+1
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bra .1
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.9 lda #ERR.INV.AM
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sec
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rts
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*---------------------------------------
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SRC.ParseLine.OPAMCheckFF
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lda #$ff Default to no AM
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>STA.G SRC.AMID
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SRC.ParseLine.OPAMCheck
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ldy #2 Skip nPtr+Len+OP
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lda (ZPOpDefPtr),y LEN
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sec LEN Byte
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adc #2 nPtr
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adc ZPOpDefPtr
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sta ZPOpDefPtr
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bcc .10
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inc ZPOpDefPtr+1
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.10 lda (ZPOpDefPtr)
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.1 >CMP.G SRC.AMID
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beq SRC.ParseLine.Emit
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ldy #1
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lda (ZPOpDefPtr),y
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inc
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sec
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adc ZPOpDefPtr
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sta ZPOpDefPtr
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bcc .2
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inc ZPOpDefPtr+1
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.2 lda (ZPOpDefPtr)
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bne .1
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.99 lda #ERR.INV.AM.4.OC
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sec
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rts
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*---------------------------------------
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SRC.ParseLine.Emit
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stz SRC.ACCTMP index in ACC
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ldy #1
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lda (ZPOpDefPtr),y
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sta SRC.ACCTMP+1 Char Count in AM
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iny
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.4 lda (ZPOpDefPtr),y
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cmp #'a
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bcs .5 lowercase, go compute address
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jsr SRC.IsDigit16
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asl
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asl
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asl
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asl
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sta SRC.ACCTMP+2
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iny
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dec SRC.ACCTMP+1
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lda (ZPOpDefPtr),y
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jsr SRC.IsDigit16
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ora SRC.ACCTMP+2
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.50 jsr OUT.EmitByte
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bcs .9
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iny
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dec SRC.ACCTMP+1
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bne .4
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clc
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rts
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.5 bne .6 cmp #'a'....
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ldx SRC.ACCTMP
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inc SRC.ACCTMP
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lda SRC.ACC,x
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bra .50
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.6 cmp #'r
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bne .7
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lda SRC.ACC.SIZE
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beq .50 Emit 00 if pending symbol (pass #1)
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jsr SRC.ComputeRel8
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bcs .91
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bra .50
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.7 cmp #'l
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bne .90
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lda SRC.ACC.SIZE
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bne .71
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jsr OUT.EmitByte Emit 00 00 if pending symbol (pass #1)
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bcs .9
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lda #0
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bra .50
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.71 jsr SRC.ComputeRel16
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bcs .91
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lda SRC.ACC
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jsr OUT.EmitByte
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bcs .9
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lda SRC.ACC+1
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bra .50
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.8 clc
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.9 rts
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.90 lda #ERR.INV.T.FILE
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sec
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rts
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.91 lda #ERR.RANGE
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sec
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rts
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*---------------------------------------
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SRC.AddToBuf inc SRC.AM.StrBuf
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ldy SRC.AM.StrBuf
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sta SRC.AM.StrBuf,y
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rts
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*---------------------------------------
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SRC.ComputeRel8 jsr SRC.ComputeRel
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bcc .1
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* positive : check 0<r<0000007F
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lda SRC.ACC+3
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ora SRC.ACC+2
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ora SRC.ACC+1
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bne .9
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lda SRC.ACC
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bmi .9
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clc
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rts
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* negative : check FFFFFF80<r<FFFFFFFF
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.1 lda SRC.ACC+3
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and SRC.ACC+2
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and SRC.ACC+1
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inc
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bne .9
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lda SRC.ACC
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bpl .9
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clc
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rts
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.9 sec
|
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rts
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*---------------------------------------
|
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SRC.ComputeRel16
|
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jsr SRC.ComputeRel
|
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bcc .1
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* positive : check 0<r<00007FFF
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lda SRC.ACC+3
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ora SRC.ACC+2
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bne .9
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lda SRC.ACC+1
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bmi .9
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clc
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rts
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* negative : check FFFF8000<r<FFFFFFFF
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||
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.1 lda SRC.ACC+3
|
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and SRC.ACC+2
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inc
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bne .9
|
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lda SRC.ACC+1
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bpl .9
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clc
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rts
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||
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.9 sec
|
||
rts
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*---------------------------------------
|
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SRC.ComputeRel phy
|
||
|
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ldy #ASM.PC
|
||
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||
clc
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lda SRC.ACC
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sbc (pData),y
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sta SRC.ACC
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iny
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lda SRC.ACC+1
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sbc (pData),y
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sta SRC.ACC+1
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iny
|
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lda SRC.ACC+2
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sbc (pData),y
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sta SRC.ACC+2
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iny
|
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lda SRC.ACC+3
|
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sbc (pData),y
|
||
sta SRC.ACC+3
|
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||
ply
|
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rts
|
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*---------------------------------------
|
||
SRC.GetDecimal jsr SRC.GetChar
|
||
beq .99
|
||
|
||
stz SRC.ACC+1
|
||
stz SRC.ACC+2
|
||
stz SRC.ACC+3
|
||
|
||
jsr SRC.IsDigit10
|
||
bcs .99
|
||
|
||
and #$0F
|
||
sta SRC.ACC
|
||
|
||
.1 jsr SRC.GetNextChar
|
||
bcs .8
|
||
|
||
cmp #' '
|
||
beq .8
|
||
|
||
jsr SRC.IsEXPReserved
|
||
bcc .8
|
||
|
||
jsr SRC.IsAMReserved
|
||
bcc .8
|
||
|
||
jsr SRC.IsDigit10
|
||
bcs .9
|
||
|
||
and #$0F
|
||
|
||
pha
|
||
jsr SRC.ACC10
|
||
pla
|
||
bcs .9
|
||
|
||
adc SRC.ACC
|
||
sta SRC.ACC
|
||
bcc .1
|
||
|
||
inc SRC.ACC+1
|
||
bne .1
|
||
inc SRC.ACC+2
|
||
bne .1
|
||
inc SRC.ACC+3
|
||
bne .1
|
||
|
||
.9 lda #ERR.VAL.TOO.BIG
|
||
sec
|
||
rts
|
||
|
||
.8 clc
|
||
rts
|
||
|
||
.99 lda #ERR.SYNTAX.ERROR
|
||
sec
|
||
rts
|
||
*---------------------------------------
|
||
SRC.GetHex jsr SRC.GetNextChar skip '$'
|
||
bcs .99
|
||
|
||
stz SRC.ACC+1
|
||
stz SRC.ACC+2
|
||
stz SRC.ACC+3
|
||
|
||
jsr SRC.IsDigit16
|
||
bcs .99
|
||
|
||
sta SRC.ACC
|
||
|
||
.1 jsr SRC.GetNextChar
|
||
bcs .8
|
||
|
||
cmp #' '
|
||
beq .8
|
||
jsr SRC.IsEXPReserved
|
||
bcc .8
|
||
jsr SRC.IsAMReserved
|
||
bcc .8
|
||
jsr SRC.IsDigit16
|
||
bcs .99
|
||
|
||
ldx #4
|
||
|
||
.2 asl SRC.ACC
|
||
rol SRC.ACC+1
|
||
rol SRC.ACC+2
|
||
rol SRC.ACC+3
|
||
bcs .9
|
||
dex
|
||
bne .2
|
||
ora SRC.ACC
|
||
sta SRC.ACC
|
||
bra .1
|
||
|
||
.8 clc
|
||
rts
|
||
|
||
.9 lda #ERR.VAL.TOO.BIG
|
||
sec
|
||
rts
|
||
|
||
.99 lda #ERR.SYNTAX.ERROR
|
||
sec
|
||
rts
|
||
*---------------------------------------
|
||
SRC.GetOctal jsr SRC.GetNextChar skip '&'
|
||
bcs .99
|
||
|
||
stz SRC.ACC+1
|
||
stz SRC.ACC+2
|
||
stz SRC.ACC+3
|
||
|
||
jsr SRC.IsDigit8
|
||
bcs .99
|
||
|
||
and #$0F
|
||
sta SRC.ACC
|
||
|
||
.1 jsr SRC.GetNextChar
|
||
bcs .8
|
||
|
||
cmp #' '
|
||
beq .8
|
||
|
||
jsr SRC.IsEXPReserved
|
||
bcc .8
|
||
|
||
jsr SRC.IsAMReserved
|
||
bcc .8
|
||
|
||
jsr SRC.IsDigit8
|
||
bcs .9
|
||
|
||
asl
|
||
asl
|
||
asl
|
||
asl
|
||
asl
|
||
|
||
ldx #3
|
||
.2 asl
|
||
rol SRC.ACC
|
||
rol SRC.ACC+1
|
||
rol SRC.ACC+2
|
||
rol SRC.ACC+3
|
||
bcs .9
|
||
dex
|
||
bne .2
|
||
bra .1
|
||
|
||
.8 clc
|
||
rts
|
||
|
||
.9 lda #ERR.VAL.TOO.BIG
|
||
sec
|
||
rts
|
||
|
||
.99 lda #ERR.SYNTAX.ERROR
|
||
sec
|
||
rts
|
||
*---------------------------------------
|
||
SRC.GetBinary jsr SRC.GetNextChar skip '%'
|
||
bcs .99
|
||
|
||
stz SRC.ACC+1
|
||
stz SRC.ACC+2
|
||
stz SRC.ACC+3
|
||
|
||
cmp #'1'
|
||
beq .10
|
||
|
||
cmp #'0'
|
||
bne .99
|
||
|
||
.10 and #$01
|
||
sta SRC.ACC
|
||
|
||
.1 jsr SRC.GetNextChar
|
||
bcs .8
|
||
|
||
cmp #' '
|
||
beq .8
|
||
|
||
jsr SRC.IsEXPReserved
|
||
bcc .8
|
||
|
||
jsr SRC.IsAMReserved
|
||
bcc .8
|
||
|
||
cmp #'1'
|
||
beq .11
|
||
|
||
cmp #'0'
|
||
bne .8
|
||
|
||
.11 lsr
|
||
|
||
rol SRC.ACC
|
||
rol SRC.ACC+1
|
||
rol SRC.ACC+2
|
||
rol SRC.ACC+3
|
||
bcs .9
|
||
bra .1
|
||
|
||
.8 clc
|
||
rts
|
||
|
||
.9 lda #ERR.VAL.TOO.BIG
|
||
sec
|
||
rts
|
||
|
||
.99 lda #ERR.SYNTAX.ERROR
|
||
sec
|
||
rts
|
||
*---------------------------------------
|
||
SRC.GetKeyword >STYA ZPPtr1 KeyWord table
|
||
|
||
ldx #0 Keyword.ID
|
||
|
||
.1 phx
|
||
|
||
lda (ZPPtr1)
|
||
beq .9 End Of table
|
||
|
||
tax KW len
|
||
|
||
ldy #0
|
||
|
||
.3 lda (ZPLinePtr),y
|
||
beq .6
|
||
|
||
jsr SRC.IsKeywordLetterUC
|
||
bcs .6
|
||
|
||
iny
|
||
cmp (ZPPtr1),y
|
||
bne .6
|
||
|
||
dex
|
||
bne .3
|
||
|
||
lda (ZPLinePtr),y All chars match...
|
||
beq .4 End of Line ?
|
||
|
||
jsr SRC.IsKeywordLetterUC
|
||
bcc .6 Additional letters...
|
||
|
||
.4 lda ZPLinePtr
|
||
clc
|
||
adc (ZPPtr1)
|
||
sta ZPLinePtr
|
||
bcc .5
|
||
inc ZPLinePtr+1
|
||
|
||
.5 plx Keyword.ID
|
||
clc
|
||
rts
|
||
|
||
.6 lda (ZPPtr1)
|
||
sec Add keyword Len+1
|
||
adc ZPPtr1
|
||
sta ZPPtr1
|
||
bcc .7
|
||
|
||
inc ZPPtr1+1
|
||
|
||
.7 plx Keyword.ID
|
||
inx
|
||
inx
|
||
bra .1
|
||
|
||
.9 plx
|
||
sec
|
||
rts
|
||
*---------------------------------------
|
||
SRC.IsAMReserved
|
||
ldx SRC.AM.RESERVED
|
||
.1 cmp SRC.AM.RESERVED,x
|
||
beq .8
|
||
dex
|
||
bne .1
|
||
sec
|
||
rts
|
||
.8 clc
|
||
rts
|
||
*---------------------------------------
|
||
SRC.IsMODReserved
|
||
ldx SRC.MOD.RESERVED
|
||
.1 cmp SRC.MOD.RESERVED,x
|
||
beq .8
|
||
dex
|
||
bne .1
|
||
sec
|
||
rts
|
||
|
||
.8 clc
|
||
rts
|
||
*---------------------------------------
|
||
SRC.IsEXPReserved
|
||
ldx SRC.EXP.RESERVED
|
||
.1 cmp SRC.EXP.RESERVED,x
|
||
beq SRC.IsEXPReserved.8
|
||
dex
|
||
bne .1
|
||
sec
|
||
rts
|
||
|
||
SRC.IsEXPReserved.8
|
||
clc
|
||
rts
|
||
*---------------------------------------
|
||
SRC.IsKeywordLetterUC
|
||
cmp #'.'
|
||
beq SRC.IsEXPReserved.8
|
||
|
||
cmp #'_'
|
||
beq SRC.IsEXPReserved.8
|
||
|
||
cmp #'A'
|
||
bcc .9
|
||
cmp #'Z'+1
|
||
bcc .99
|
||
|
||
cmp #'a'
|
||
bcc .9
|
||
cmp #'z'+1
|
||
|
||
eor #$20
|
||
|
||
rts CC if lowercase
|
||
|
||
.9 sec
|
||
.99 rts
|
||
*---------------------------------------
|
||
|
||
*---------------------------------------
|
||
SRC.IsLetterOrDigit
|
||
jsr SRC.IsDigit10
|
||
bcc SRC.IsLetterRTS
|
||
*---------------------------------------
|
||
SRC.IsLetter cmp #'A'
|
||
bcc .9
|
||
cmp #'Z'+1
|
||
bcc SRC.IsLetterRTS
|
||
|
||
cmp #'a'
|
||
bcc .9
|
||
cmp #'z'+1
|
||
rts CC if lowercase
|
||
|
||
.9 sec
|
||
SRC.IsLetterRTS rts
|
||
*---------------------------------------
|
||
SRC.IsDigit16 jsr SRC.IsDigit10
|
||
bcc .8
|
||
cmp #'A'
|
||
bcc .9
|
||
cmp #'F'+1
|
||
bcc .1
|
||
|
||
cmp #'a'
|
||
bcc .9
|
||
cmp #'f'+1
|
||
bcs .9
|
||
|
||
eor #$20
|
||
|
||
.1
|
||
* clc
|
||
sbc #'A'-11 cc so A->10 (11-CC)
|
||
clc
|
||
|
||
.8 and #$0F
|
||
rts
|
||
|
||
.9 sec
|
||
rts
|
||
*---------------------------------------
|
||
SRC.IsDigit10 cmp #'0'
|
||
bcc .9
|
||
cmp #'9'+1
|
||
rts cc if ok, cs if not
|
||
|
||
.9 sec
|
||
rts
|
||
*---------------------------------------
|
||
SRC.IsDigit8 cmp #'0'
|
||
bcc .9
|
||
cmp #'7'+1
|
||
rts cc if ok, cs if not
|
||
|
||
.9 sec
|
||
rts
|
||
*---------------------------------------
|
||
SRC.GetNextCharNB
|
||
jsr SRC.GetNextChar
|
||
bcs .9
|
||
cmp #' '
|
||
beq SRC.GetNextCharNB
|
||
|
||
clc
|
||
|
||
.9 rts
|
||
*---------------------------------------
|
||
SRC.GetNextCharUC
|
||
jsr SRC.GetNextChar
|
||
bcs .9
|
||
cmp #'a'
|
||
bcc .8
|
||
cmp #'z'+1
|
||
bcs .8
|
||
eor #$20 to Uppercase
|
||
|
||
.8 clc
|
||
.9 rts
|
||
*---------------------------------------
|
||
SRC.GetNextChar lda (ZPLinePtr)
|
||
beq SRC.GetChar.ERR
|
||
cmp #$0D
|
||
beq SRC.GetChar.ERR
|
||
|
||
inc ZPLinePtr
|
||
bne SRC.GetChar
|
||
|
||
inc ZPLinePtr+1
|
||
|
||
SRC.GetChar lda (ZPLinePtr)
|
||
beq SRC.GetChar.ERR
|
||
cmp #$0D
|
||
beq SRC.GetChar.ERR
|
||
|
||
clc
|
||
rts
|
||
|
||
SRC.GetChar.ERR sec
|
||
rts
|
||
*---------------------------------------
|
||
SRC.ACC10 lda SRC.ACC ACC*2-> ACC & ACCTMP
|
||
asl
|
||
sta SRC.ACC
|
||
sta SRC.ACCTMP
|
||
lda SRC.ACC+1
|
||
rol
|
||
sta SRC.ACC+1
|
||
sta SRC.ACCTMP+1
|
||
lda SRC.ACC+2
|
||
rol
|
||
sta SRC.ACC+2
|
||
sta SRC.ACCTMP+2
|
||
lda SRC.ACC+3
|
||
rol
|
||
sta SRC.ACC+3
|
||
sta SRC.ACCTMP+3
|
||
bcs .9
|
||
|
||
ldx #2
|
||
.1 asl SRC.ACC ACC=ACC*4
|
||
rol SRC.ACC+1
|
||
rol SRC.ACC+2
|
||
rol SRC.ACC+3
|
||
bcs .9
|
||
dex
|
||
bne .1
|
||
|
||
lda SRC.ACC CC from ROL SRC.ACC+3
|
||
adc SRC.ACCTMP
|
||
sta SRC.ACC
|
||
lda SRC.ACC+1
|
||
adc SRC.ACCTMP+1
|
||
sta SRC.ACC+1
|
||
lda SRC.ACC+2
|
||
adc SRC.ACCTMP+2
|
||
sta SRC.ACC+2
|
||
lda SRC.ACC+3
|
||
adc SRC.ACCTMP+3
|
||
sta SRC.ACC+3 CS if overflow
|
||
|
||
.9 rts
|
||
*---------------------------------------
|
||
MAN
|
||
SAVE /A2OSX.BUILD/BIN/DEV/ASM.S.SRC
|
||
LOAD /A2OSX.BUILD/BIN/DEV/ASM.S
|
||
ASM
|