mirror of https://github.com/A2osX/A2osX.git
462 lines
11 KiB
Plaintext
462 lines
11 KiB
Plaintext
NEW
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AUTO 3,1
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*--------------------------------------
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* DIRECTIVES
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*--------------------------------
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* .DUMMY -- START DUMMY SECTION
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*--------------------------------
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D.DUMMY
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LDA DUMMY.FLAG DO NOTHING IF ALREADY IN DUMMY
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BMI .2
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LDX #3
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.1 LDA ORGN,X
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STA DUMMY.ORGN,X
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DEX
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BPL .1
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STX DUMMY.FLAG SET FLAG NEGATIVE
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.2 RTS
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*--------------------------------
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* .ED -- END DUMMY SECTION
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*--------------------------------
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D.END.DUMMY
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LDA DUMMY.FLAG
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BPL .2 DO NOTHING IF NOT IN .DUMMY
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LDX #3
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STX DUMMY.FLAG SET FLAG POSITIVE
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.1 LDA DUMMY.ORGN,X
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STA ORGN,X
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DEX
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BPL .1
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.2 RTS RETURN TO MAIN LEVEL OF ASM
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*---------------------------------
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* .PH -- START PHASE
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*--------------------------------
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D.PHASE
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JSR D.END.PHASE
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JSR EXPR.DEFINED GET PHASE ORIGIN
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LDX #3
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.1 LDA ORGN,X SAVE ORIGIN
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STA ORIGIN.SAVE,X
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LDA EXP.VALUE,X
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STA ORGN,X SET PHASE ORIGIN
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DEX
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BPL .1
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SEC SET FLAG TO $80
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ROR PHASE.FLAG
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RTS RETURN TO MAIN LEVEL OF ASM
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*--------------------------------
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* .EP -- END PHASE
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*--------------------------------
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D.END.PHASE
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ASL PHASE.FLAG TEST AND CLEAR FLAG
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BCC .2 IT WAS ALREADY CLEAR
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LDX #3
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.1 LDA ORIGIN.SAVE,X
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STA ORGN,X
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DEX
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BPL .1
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.2 RTS
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*---------------------------------
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* .OR -- SET ORIGIN
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*---------------------------------
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PSOR JSR EXPR.DEFINED GET ORIGIN VALUE
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LDX #3
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.1 LDA EXP.VALUE,X STORE IT IN
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STA ORGN,X LOCATION
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DEX COUNTER
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BPL .1
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LDA DUMMY.FLAG IF IN DUMMY SECTION, DON'T
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BMI RTS.1 ...IN DUMMY
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NEW.TARGET
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JSR TFEND END .TF IF DOING ONE
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LDA EXP.VALUE STORE VALUE IN
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STA TRGT TARGET ADDRESS
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LDA EXP.VALUE+1
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STA TRGT+1
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RTS.1 RTS
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*---------------------------------
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* .TA -- SET TARGET ADDRESS
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*---------------------------------
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PSTA JSR EXPR.DEFINED GET EXPR VALUE
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LDA EXP.VALUE+2
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ORA EXP.VALUE+3
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BEQ NEW.TARGET
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JMP RAER
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*--------------------------------------
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DIR1.PS jsr GNNB
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bcs .9
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sta DLIM SAVE DELIMITER
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ldx #$ff
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ldy CHAR.PNTR
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.1 inx
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lda WBUF,Y
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and #$7F
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beq .9
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iny
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cmp DLIM
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bne .1
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txa
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jsr EMIT
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.2 jsr GNC
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jsr EMIT
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dex
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bne .2
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clc
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rts
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.9 jmp ERBA2
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*--------------------------------------
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DIR1.EscChars .AS "abefnrtv"
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.HS 5C27223F25 \'"?%
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DIR1.EscChars.L .EQ *-DIR1.EscChars
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DIR1.EscCodes .HS 07081B0C0A0D090B
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.HS 5C27223F25
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*--------------------------------------
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DIR1.CZ jsr DIR1.CS
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jmp EMIT.ZERO
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DIR1.CS lda #0
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sec
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jmp DIR1.String
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*--------------------------------------
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* .AT -- ASCII STRING WITH LAST BYTE FLAGGED
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* .AS -- ASCII STRING WITH ALL BYTES SAME
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* .AZ -- Same as .AS, but with 00 terminator byte.
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*--------------------------------------
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PSAZ jsr PSAS
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jmp EMIT.ZERO
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PSAT lda #$80 LAST BYTE HAS OPPOSITE BIT 7
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.HS 2C ...SKIP OVER 2 BYTES
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PSAS lda #0 ALL BYTES GET SAME BIT 7
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clc
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DIR1.String sta AT.HIBIT
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ror BYTE C String Flag
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jsr GNNB Scan to next non-blank
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bcs .9 END OF LINE
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dec CHAR.PNTR BACK UP
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.1 jsr TRY.HEX.STRING
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beq .5 ...END OF LINE
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ldy #0
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sty AS.HIBIT ...assume hibit is 0
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cmp #'-' 1ST NON-BLANK A MINUS?
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bne .15 ...no, hibit is 0
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ror AS.HIBIT ...yes, hibit is 1
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jsr GNC.UC
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.15 sta DLIM SAVE DELIMITER
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jsr GNC.UC GET NEXT CHAR
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bcs .9 END OF LINE IS BAD NEWS
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cmp DLIM CHK IF DELIMITER
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beq .4 YES, NO STRING IN BETWEEN
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.2 jsr GNC.UC GET NEXT CHAR
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bcs .9 END OF LINE IS BAD NEWS
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cmp DLIM CHK IF DELIMITER
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beq .3 YES, FINISH UP AND RETURN
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lda WBUF-2,Y ...NO, GET PREVIOUS CHAR
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bit BYTE
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bpl .27
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cmp #'\' "\?" ?
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bne .27
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jsr GNC.UC GET NEXT CHAR
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bcs .9 END OF LINE IS BAD NEWS
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lda WBUF-2,Y get "?"
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ldx #DIR1.EscChars.L-1
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.20 cmp DIR1.EscChars,x
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beq .21
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dex
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bpl .20
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bmi .9
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.21 lda DIR1.EscCodes,x
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ldx WBUF-1,Y
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cpx DLIM
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beq .30
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.27 ora AS.HIBIT MERGE WITH TOP BIT
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jsr EMIT
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jmp .2 GO FOR ANOTHER ONE
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.3 lda WBUF-2,Y GET PREVIOUS CHAR
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.30 ora AS.HIBIT MERGE WITH SELECTED BIT 7
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eor AT.HIBIT TOGGLE BIT 7 IF IN .AT
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jsr EMIT EMIT THE BYTE
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.4 jsr GNC CHECK IF MORE IN LIST
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beq .5
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cmp #','
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beq .1
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.5 rts
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.9 jmp ERBA2
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*---------------------------------
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* .HX -- HEX DIGIT STRING
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*---------------------------------
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PSHX jsr GNNB GET NEXT NON-BLANK CHAR
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bcs ERBA2 END OF LINE
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jsr BACKUP.CHAR.PNTR
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.1 jsr PSHX.GetNibble
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bcs .8
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.2 sta SYM.VALUE
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jsr PSHX.GetNibble
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bcs .7
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asl
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asl
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asl
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asl
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ora SYM.VALUE
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jsr EMIT
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jsr PSHX.GetNibble
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bcc .2
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clc
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rts
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.7 lda SYM.VALUE
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jsr EMIT
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.8 rts
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*---------------------------------
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PSHX.GetNibble
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.1 jsr GNC.UC IGNORE CASE
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beq .9
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cmp #'.' ALLOW PERIODS
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beq .1 ...BUT IGNORE THEM
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eor #$30
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cmp #$0A
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bcc .3 ...0-9, TEXT VALIDITY
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adc #$88 ...MIGHT BE A...F
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.2 cmp #$FA
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bcc .3 NOT A-F EITHER, RETURN CARRY CLEAR
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and #$0F TRIM HEX A...F
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.3 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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* .HS -- HEX STRING
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*---------------------------------
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PSHS jsr GNNB GET NEXT NON-BLANK CHAR
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bcs ERBA2 END OF LINE
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jsr BACKUP.CHAR.PNTR
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jsr TRY.HEX.STRING
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bne ERBA2 ...ERROR, BAD ADDRESS
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rts
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*--------------------------------
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THX1 jsr HEX.DIGIT GET NEXT HEX DIGIT
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bcc ERBA2 ERROR, ODD DIGITS
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lda SYM.VALUE GET CONVERTED VALUE
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jsr EMIT
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*--------------------------------
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TRY.HEX.STRING jsr HEX.DIGIT
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bcs THX1
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lda CURRENT.CHAR
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beq .2 ...END OF LINE
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cmp #',' IF COMMA, GO GET MORE BYTES
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beq TRY.HEX.STRING ...OKAY
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cmp #' ' IF BLANK, VALID END OF STRING
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.2 rts
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*--------------------------------
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ERBA2 jmp ERBA ERROR: BAD ADDRESS
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GT255ERR ldy #QER8 VALUE > 255 ERROR
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.HS 2C LONG "BIT" TO SKIP NEXT TWO BYTES
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NOLBLERR ldy #QER1 "NO LABEL"
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.HS 2C LONG "BIT" TO SKIP NEXT TWO BYTES
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UNDF ldy #QER6 "UNDEF"
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jmp SOFT.ERROR
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*---------------------------------
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* .EQ -- EQUATE
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*---------------------------------
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PSEQ LDY WBUF SEE IF ANY LABEL
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CPY #$20
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BEQ NOLBLERR NO LABEL ON LINE
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LDA STPNTR SAVE STPNTR WHILE CALLING EXPR
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PHA
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LDA STPNTR+1
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PHA
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JSR EXPR.DEFINED GET VALUE
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PLA RESTORE STPNTR
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STA STPNTR+1
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PLA
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STA STPNTR
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LDA PASS WHICH PASS
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BNE .5 PASS 2, PRINT VALUE
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*---PASS 1: DEFINE VALUE--------
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LDY WBUF COLUMN 1 AGAIN
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CPY #': PRIVATE LABEL?
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BCC .4 ...LOCAL LABEL
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BEQ .2 ...PRIVATE LABEL
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*---NORMAL LABEL-----------------
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LDY #2
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.1 LDA EXP.VALUE-2,Y REDEFINE SYMBOL
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>SYM STA,PNTR
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INY
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CPY #6
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BCC .1
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RTS
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*---PRIVATE LABEL----------------
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.2 LDY #0
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.3 LDA EXP.VALUE,Y
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>SYM STA,STPNTR
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INY
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CPY #4
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BCC .3
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RTS
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*---LOCAL LABEL------------------
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.4 LDY #2 COMPUTE LOCAL OFFSET
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SEC
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LDA EXP.VALUE
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>SYM SBC,STPNTR
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DEY
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>SYM STA,PNTR
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LDY #3
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LDA EXP.VALUE+1
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>SYM SBC,STPNTR
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BNE GT255ERR VALUE > 255
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RTS RETURN TO MAIN LEVEL OF ASM
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*---PASS 2: PRINT VALUE---------
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.5 JMP P.EXP.VALUE.DASH
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*---------------------------------
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* .DA -- DATA VALUE (8- OR 16-BITS)
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*---------------------------------
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PSDA LDA #0 UNDEF FLAG FOR LINE
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PHA
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.1 JSR GNNB GET NEXT NON-BLANK CHAR
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BCS ERBA2 END OF LINE
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STA DLIM
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*---Could be $$dstringd----------
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CMP #'$' $$dstringd value?
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BNE .2 ...NO
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LDA WBUF,Y Look for second $
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CMP #'$'
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BNE .25 ...NO, MUST BE SIMPLE HEX WORD
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JSR GNC SKIP OVER SECOND '$'
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JSR PSAS GET dstringd
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JMP .5
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*---Look for size char-----------
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.2 LDY #1 ASSUME 1-BYTE DATA
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CMP #'#'
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BEQ .3
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CMP #'/'
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BEQ .3
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LDY #3 ASSUME 3-BYTE DATA
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CMP #'<' 24-BIT SIGNAL
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BEQ .3 ...3-BYTE DATA
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INY ASSUME 4-BYTE DATA
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CMP #'>' 32-BIT SIGNAL
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BEQ .3
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*---Size is two bytes------------
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.25 JSR BACKUP.CHAR.PNTR
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LDY #2 2-BYTE DATA
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*---Get expression, emit value---
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.3 STY ADDR.LENGTH
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JSR EXPR CRACK EXPRESSION
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LDY DLIM If preceded by /, shift over
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CPY #'/'
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BNE .4 ...NOT /
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JSR EXP.OVER.256
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.4 JSR EMIT.VALUE ACCORDING TO ADDR.LENGTH
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*---Update UNDEF flag------------
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PLA .DA'S UNDEF FLAG
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ORA EXP.UNDEF
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PHA
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*---Next item in list------------
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.5 JSR GNC.UC LOOK FOR ANOTHER ITEM
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CMP #', COMMA?
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BEQ .1 YES, GET ANOTHER ONE
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PLA GET .DA'S UNDEF FLAG
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STA EXP.UNDEF MERGED VALUE
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RTS LIST LINE OR REPORT UNDEF ERROR
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*--------------------------------
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* DO/ELSE/FIN
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*--------------------------------
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PSDO JSR EXPR.DEFINED GET VALUE
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LDX DO.INDEX 0 IF EMPTY, ELSE 1-63
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INX
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CPX #64
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BCC .2
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LDY #QERDO2 ".DO NEST TOO DEEP"
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JMP SOFT.ERROR
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.2 LDA EXP.VALUE
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ORA EXP.VALUE+1 TEST FOR ZERO
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ORA EXP.VALUE+2
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ORA EXP.VALUE+3
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BEQ .3 ZERO, FALSE
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SEC NONZERO, TRUE
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.3 STX DO.INDEX
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LDX #-8
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.4 ROR DO.STACK+8,X
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INX
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BNE .4
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RTS LIST THE LINE
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*--------------------------------
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PSEL LDX DO.INDEX
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BEQ ERR.DO ERROR, NOT BTWN .DO AND .FIN
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LDA DO.STACK
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EOR #$80 TOGGLE CURRENT LOGIC LEVEL
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STA DO.STACK
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RTS RETURN TO MAIN LEVEL OF ASM
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*--------------------------------
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ERR.DO LDY #QERDO "MISSING .DO"
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JMP SOFT.ERROR
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*--------------------------------
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PSFI LDX DO.INDEX
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BEQ ERR.DO ERROR, NOT AFTER .DO
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DEC DO.INDEX POP THIS DO
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LDX #7
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.1 ROL DO.STACK,X
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DEX
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BPL .1
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RTS RETURN TO MAIN LEVEL OF ASM
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*--------------------------------------
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MAN
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SAVE usr/src/scmasm.31/scmasm.s.dir1
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LOAD usr/src/scmasm.31/scmasm.s
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ASM
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