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