mirror of https://github.com/mist64/msbasic.git
789 lines
17 KiB
ArmAsm
789 lines
17 KiB
ArmAsm
.segment "CODE"
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; ----------------------------------------------------------------------------
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; "NEXT" STATEMENT
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; ----------------------------------------------------------------------------
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NEXT:
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bne NEXT1
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ldy #$00
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beq NEXT2
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NEXT1:
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jsr PTRGET
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NEXT2:
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sta FORPNT
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sty FORPNT+1
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jsr GTFORPNT
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beq NEXT3
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ldx #$00
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GERR:
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beq JERROR
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NEXT3:
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txs
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.ifndef CONFIG_2
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inx
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inx
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inx
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inx
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.endif
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txa
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.ifdef CONFIG_2
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clc
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adc #$04
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pha
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adc #BYTES_FP+1
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sta DEST
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pla
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.else
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inx
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inx
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inx
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inx
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inx
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.ifndef CONFIG_SMALL
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inx
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.endif
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stx DEST
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.endif
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ldy #>STACK
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jsr LOAD_FAC_FROM_YA
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tsx
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lda STACK+BYTES_FP+4,x
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sta FACSIGN
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lda FORPNT
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ldy FORPNT+1
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jsr FADD
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jsr SETFOR
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ldy #>STACK
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jsr FCOMP2
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tsx
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sec
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sbc STACK+BYTES_FP+4,x
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beq L2C22
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lda STACK+2*BYTES_FP+5,x
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sta CURLIN
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lda STACK+2*BYTES_FP+6,x
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sta CURLIN+1
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lda STACK+2*BYTES_FP+8,x
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sta TXTPTR
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lda STACK+2*BYTES_FP+7,x
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sta TXTPTR+1
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L2C1F:
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jmp NEWSTT
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L2C22:
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txa
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adc #2*BYTES_FP+7
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tax
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txs
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jsr CHRGOT
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cmp #$2C
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bne L2C1F
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jsr CHRGET
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jsr NEXT1
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; ----------------------------------------------------------------------------
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; EVALUATE EXPRESSION, MAKE SURE IT IS NUMERIC
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; ----------------------------------------------------------------------------
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FRMNUM:
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jsr FRMEVL
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; ----------------------------------------------------------------------------
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; MAKE SURE (FAC) IS NUMERIC
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; ----------------------------------------------------------------------------
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CHKNUM:
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clc
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.byte $24
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; ----------------------------------------------------------------------------
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; MAKE SURE (FAC) IS STRING
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; ----------------------------------------------------------------------------
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CHKSTR:
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sec
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; ----------------------------------------------------------------------------
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; MAKE SURE (FAC) IS CORRECT TYPE
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; IF C=0, TYPE MUST BE NUMERIC
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; IF C=1, TYPE MUST BE STRING
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; ----------------------------------------------------------------------------
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CHKVAL:
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bit VALTYP
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bmi L2C41
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bcs L2C43
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L2C40:
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rts
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L2C41:
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bcs L2C40
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L2C43:
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ldx #ERR_BADTYPE
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JERROR:
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jmp ERROR
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; ----------------------------------------------------------------------------
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; EVALUATE THE EXPRESSION AT TXTPTR, LEAVING THE
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; RESULT IN FAC. WORKS FOR BOTH STRING AND NUMERIC
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; EXPRESSIONS.
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; ----------------------------------------------------------------------------
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FRMEVL:
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ldx TXTPTR
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bne L2C4E
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dec TXTPTR+1
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L2C4E:
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dec TXTPTR
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ldx #$00
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.byte $24
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FRMEVL1:
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pha
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txa
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pha
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lda #$01
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jsr CHKMEM
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jsr FRM_ELEMENT
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lda #$00
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sta CPRTYP
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FRMEVL2:
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jsr CHRGOT
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L2C65:
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sec
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sbc #TOKEN_GREATER
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bcc L2C81
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cmp #$03
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bcs L2C81
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cmp #$01
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rol a
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eor #$01
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eor CPRTYP
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cmp CPRTYP
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bcc SNTXERR
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sta CPRTYP
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jsr CHRGET
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jmp L2C65
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L2C81:
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ldx CPRTYP
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bne FRM_RELATIONAL
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bcs L2D02
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adc #$07
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bcc L2D02
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adc VALTYP
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bne L2C92
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jmp CAT
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L2C92:
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adc #$FF
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sta INDEX
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asl a
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adc INDEX
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tay
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FRM_PRECEDENCE_TEST:
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pla
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cmp MATHTBL,y
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bcs FRM_PERFORM1
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jsr CHKNUM
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L2CA3:
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pha
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L2CA4:
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jsr FRM_RECURSE
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pla
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ldy LASTOP
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bpl PREFNC
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tax
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beq GOEX
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bne FRM_PERFORM2
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; ----------------------------------------------------------------------------
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; FOUND ONE OR MORE RELATIONAL OPERATORS <,=,>
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; ----------------------------------------------------------------------------
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FRM_RELATIONAL:
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lsr VALTYP
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txa
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rol a
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ldx TXTPTR
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bne L2CBB
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dec TXTPTR+1
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L2CBB:
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dec TXTPTR
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ldy #$1B
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sta CPRTYP
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bne FRM_PRECEDENCE_TEST
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PREFNC:
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cmp MATHTBL,y
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bcs FRM_PERFORM2
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bcc L2CA3
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; ----------------------------------------------------------------------------
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; STACK THIS OPERATION AND CALL FRMEVL FOR
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; ANOTHER ONE
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; ----------------------------------------------------------------------------
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FRM_RECURSE:
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lda MATHTBL+2,y
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pha
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lda MATHTBL+1,y
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pha
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jsr FRM_STACK1
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lda CPRTYP
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jmp FRMEVL1
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SNTXERR:
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jmp SYNERR
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; ----------------------------------------------------------------------------
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; STACK (FAC)
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; THREE ENTRY POINTS:
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; 1, FROM FRMEVL
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; 2, FROM "STEP"
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; 3, FROM "FOR"
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; ----------------------------------------------------------------------------
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FRM_STACK1:
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lda FACSIGN
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ldx MATHTBL,y
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; ----------------------------------------------------------------------------
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; ENTER HERE FROM "STEP", TO PUSH STEP SIGN AND VALUE
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; ----------------------------------------------------------------------------
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FRM_STACK2:
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tay
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pla
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sta INDEX
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.ifndef CONFIG_2B
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inc INDEX ; bug: assumes not on page boundary
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; bug exists on AppleSoft II
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.endif
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pla
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sta INDEX+1
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.ifdef CONFIG_2B
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inc INDEX
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bne LEB69
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inc INDEX+1
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LEB69:
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.endif
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tya
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pha
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; ----------------------------------------------------------------------------
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; ENTER HERE FROM "FOR", WITH (INDEX) = STEP,
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; TO PUSH INITIAL VALUE OF "FOR" VARIABLE
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; ----------------------------------------------------------------------------
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FRM_STACK3:
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jsr ROUND_FAC
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.ifndef CONFIG_SMALL
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lda FAC+4
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pha
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.endif
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lda FAC+3
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pha
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lda FAC+2
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pha
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lda FAC+1
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pha
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lda FAC
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pha
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jmp (INDEX)
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L2D02:
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ldy #$FF
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pla
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GOEX:
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beq EXIT
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; ----------------------------------------------------------------------------
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; PERFORM STACKED OPERATION
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;
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; (A) = PRECEDENCE BYTE
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; STACK: 1 -- CPRMASK
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; 5 -- (ARG)
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; 2 -- ADDR OF PERFORMER
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; ----------------------------------------------------------------------------
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FRM_PERFORM1:
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cmp #$64
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beq L2D0E
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jsr CHKNUM
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L2D0E:
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sty LASTOP
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FRM_PERFORM2:
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pla
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lsr a
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sta CPRMASK
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pla
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sta ARG
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pla
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sta ARG+1
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pla
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sta ARG+2
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pla
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sta ARG+3
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pla
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.ifndef CONFIG_SMALL
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sta ARG+4
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pla
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.endif
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sta ARGSIGN
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eor FACSIGN
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sta SGNCPR
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EXIT:
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lda FAC
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rts
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; ----------------------------------------------------------------------------
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; GET ELEMENT IN EXPRESSION
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;
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; GET VALUE OF VARIABLE OR NUMBER AT TXTPNT, OR POINT
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; TO STRING DESCRIPTOR IF A STRING, AND PUT IN FAC.
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; ----------------------------------------------------------------------------
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FRM_ELEMENT:
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lda #$00
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sta VALTYP
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L2D31:
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jsr CHRGET
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bcs L2D39
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L2D36:
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jmp FIN
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L2D39:
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jsr ISLETC
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bcs FRM_VARIABLE
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.ifdef CONFIG_CBM_ALL
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cmp #$FF
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bne LCDC1
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lda #<CON_PI
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ldy #>CON_PI
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jsr LOAD_FAC_FROM_YA
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jmp CHRGET
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CON_PI:
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.byte $82,$49,$0f,$DA,$A1
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LCDC1:
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.endif
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cmp #$2E
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beq L2D36
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cmp #TOKEN_MINUS
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beq MIN
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cmp #TOKEN_PLUS
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beq L2D31
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cmp #$22
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bne NOT_
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; ----------------------------------------------------------------------------
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; STRING CONSTANT ELEMENT
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;
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; SET Y,A = (TXTPTR)+CARRY
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; ----------------------------------------------------------------------------
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STRTXT:
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lda TXTPTR
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ldy TXTPTR+1
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adc #$00
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bcc L2D57
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iny
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L2D57:
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jsr STRLIT
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jmp POINT
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; ----------------------------------------------------------------------------
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; "NOT" FUNCTION
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; IF FAC=0, RETURN FAC=1
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; IF FAC<>0, RETURN FAC=0
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; ----------------------------------------------------------------------------
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NOT_:
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cmp #TOKEN_NOT
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bne L2D74
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ldy #$18
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bne EQUL
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; ----------------------------------------------------------------------------
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; COMPARISON FOR EQUALITY (= OPERATOR)
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; ALSO USED TO EVALUATE "NOT" FUNCTION
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; ----------------------------------------------------------------------------
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EQUOP:
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jsr AYINT
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lda FAC_LAST
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eor #$FF
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tay
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lda FAC_LAST-1
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eor #$FF
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jmp GIVAYF
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L2D74:
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.ifdef SYM1
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cmp #TOKEN_USR
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bne LCC8A
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jmp LCDBD
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LCC8A:
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cmp #$26
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bne LCC91
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jmp LCDFE
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LCC91:
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.endif
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cmp #TOKEN_FN
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bne L2D7B
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jmp L31F3
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L2D7B:
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cmp #TOKEN_SGN
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bcc PARCHK
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jmp UNARY
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; ----------------------------------------------------------------------------
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; EVALUATE "(EXPRESSION)"
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; ----------------------------------------------------------------------------
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PARCHK:
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jsr CHKOPN
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jsr FRMEVL
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CHKCLS:
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lda #$29
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.byte $2C
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CHKOPN:
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lda #$28
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.byte $2C
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CHKCOM:
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lda #$2C
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; ----------------------------------------------------------------------------
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; UNLESS CHAR AT TXTPTR = (A), SYNTAX ERROR
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; ----------------------------------------------------------------------------
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SYNCHR: ; XXX all CBM code calls SYNCHR instead of CHKCOM
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ldy #$00
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cmp (TXTPTR),y
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bne SYNERR
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jmp CHRGET
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; ----------------------------------------------------------------------------
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SYNERR:
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ldx #ERR_SYNTAX
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jmp ERROR
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; ----------------------------------------------------------------------------
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MIN:
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ldy #$15
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EQUL:
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pla
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pla
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jmp L2CA4
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; ----------------------------------------------------------------------------
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FRM_VARIABLE:
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jsr PTRGET
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FRM_VARIABLE_CALL = *-1
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sta FAC_LAST-1
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sty FAC_LAST
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.ifdef CONFIG_CBM_ALL
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lda VARNAM
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ldy VARNAM+1
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.endif
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ldx VALTYP
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beq L2DB1
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.ifdef CONFIG_CBM_ALL
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.ifdef CONFIG_CBM1_PATCHES
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jmp PATCH2
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clc
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LCE3B:
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.else
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ldx #$00
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stx STRNG1+1
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bit FAC+4
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bpl LCE53
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cmp #$54 ; T
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bne LCE53
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.endif
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cpy #$C9 ; I$
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bne LCE53
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jsr LCE76
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sty EXPON
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dey
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sty STRNG2
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ldy #$06
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sty INDX
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ldy #$24
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jsr LDD3A
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jmp LD353
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LCE53:
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.endif
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.ifdef CONFIG_2
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.ifndef CBM2
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; bugfix?
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; fixed on AppleSoft II, not on any CBM
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ldx #$00
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stx STRNG1+1
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.endif
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.endif
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rts
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L2DB1:
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.ifndef CONFIG_SMALL
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ldx VALTYP+1
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bpl L2DC2
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ldy #$00
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lda (FAC+3),y
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tax
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|
iny
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lda (FAC+3),y
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tay
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txa
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jmp GIVAYF
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L2DC2:
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.endif
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.ifdef CONFIG_CBM1_PATCHES
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jmp PATCH3
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.byte $19
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.endif
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.ifdef CBM2
|
|
bit FAC+4
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bpl LCE90
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cmp #$54
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bne LCE82
|
|
.endif
|
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.ifndef CONFIG_CBM_ALL
|
|
jmp LOAD_FAC_FROM_YA
|
|
.endif
|
|
.ifdef CONFIG_CBM_ALL
|
|
LCE69:
|
|
cpy #$49
|
|
.ifdef CBM1
|
|
bne LCE82
|
|
.else
|
|
bne LCE90
|
|
.endif
|
|
jsr LCE76
|
|
tya
|
|
ldx #$A0
|
|
jmp LDB21
|
|
LCE76:
|
|
.ifdef CBM1
|
|
lda #$FE
|
|
ldy #$01
|
|
.else
|
|
lda #$8B
|
|
ldy #$00
|
|
.endif
|
|
sei
|
|
jsr LOAD_FAC_FROM_YA
|
|
cli
|
|
sty FAC+1
|
|
rts
|
|
LCE82:
|
|
cmp #$53
|
|
bne LCE90
|
|
cpy #$54
|
|
bne LCE90
|
|
lda Z96
|
|
jmp FLOAT
|
|
LCE90:
|
|
lda FAC+3
|
|
ldy FAC+4
|
|
jmp LOAD_FAC_FROM_YA
|
|
.endif
|
|
|
|
; ----------------------------------------------------------------------------
|
|
UNARY:
|
|
asl a
|
|
pha
|
|
tax
|
|
jsr CHRGET
|
|
cpx #<(TOKEN_LEFTSTR*2-1)
|
|
bcc L2DEF
|
|
jsr CHKOPN
|
|
jsr FRMEVL
|
|
jsr CHKCOM
|
|
jsr CHKSTR
|
|
pla
|
|
tax
|
|
lda FAC_LAST
|
|
pha
|
|
lda FAC_LAST-1
|
|
pha
|
|
txa
|
|
pha
|
|
jsr GETBYT
|
|
pla
|
|
tay
|
|
txa
|
|
pha
|
|
jmp L2DF4
|
|
L2DEF:
|
|
jsr PARCHK
|
|
pla
|
|
tay
|
|
L2DF4:
|
|
lda UNFNC-TOKEN_SGN-TOKEN_SGN+$100,y
|
|
sta JMPADRS+1
|
|
lda UNFNC-TOKEN_SGN-TOKEN_SGN+$101,y
|
|
sta JMPADRS+2
|
|
.ifdef KBD
|
|
jsr LF47D
|
|
.else
|
|
jsr JMPADRS
|
|
.endif
|
|
jmp CHKNUM
|
|
|
|
; ----------------------------------------------------------------------------
|
|
OR:
|
|
ldy #$FF
|
|
.byte $2C
|
|
; ----------------------------------------------------------------------------
|
|
TAND:
|
|
ldy #$00
|
|
sty EOLPNTR
|
|
jsr AYINT
|
|
lda FAC_LAST-1
|
|
eor EOLPNTR
|
|
sta CHARAC
|
|
lda FAC_LAST
|
|
eor EOLPNTR
|
|
sta ENDCHR
|
|
jsr COPY_ARG_TO_FAC
|
|
jsr AYINT
|
|
lda FAC_LAST
|
|
eor EOLPNTR
|
|
and ENDCHR
|
|
eor EOLPNTR
|
|
tay
|
|
lda FAC_LAST-1
|
|
eor EOLPNTR
|
|
and CHARAC
|
|
eor EOLPNTR
|
|
jmp GIVAYF
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; PERFORM RELATIONAL OPERATIONS
|
|
; ----------------------------------------------------------------------------
|
|
RELOPS:
|
|
jsr CHKVAL
|
|
bcs STRCMP
|
|
lda ARGSIGN
|
|
ora #$7F
|
|
and ARG+1
|
|
sta ARG+1
|
|
lda #<ARG
|
|
ldy #$00
|
|
jsr FCOMP
|
|
tax
|
|
jmp NUMCMP
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; STRING COMPARISON
|
|
; ----------------------------------------------------------------------------
|
|
STRCMP:
|
|
lda #$00
|
|
sta VALTYP
|
|
dec CPRTYP
|
|
jsr FREFAC
|
|
sta FAC
|
|
stx FAC+1
|
|
sty FAC+2
|
|
lda ARG_LAST-1
|
|
ldy ARG_LAST
|
|
jsr FRETMP
|
|
stx ARG_LAST-1
|
|
sty ARG_LAST
|
|
tax
|
|
sec
|
|
sbc FAC
|
|
beq L2E74
|
|
lda #$01
|
|
bcc L2E74
|
|
ldx FAC
|
|
lda #$FF
|
|
L2E74:
|
|
sta FACSIGN
|
|
ldy #$FF
|
|
inx
|
|
STRCMP1:
|
|
iny
|
|
dex
|
|
bne L2E84
|
|
ldx FACSIGN
|
|
NUMCMP:
|
|
bmi CMPDONE
|
|
clc
|
|
bcc CMPDONE
|
|
L2E84:
|
|
lda (ARG_LAST-1),y
|
|
cmp (FAC+1),y
|
|
beq STRCMP1
|
|
ldx #$FF
|
|
bcs CMPDONE
|
|
ldx #$01
|
|
CMPDONE:
|
|
inx
|
|
txa
|
|
rol a
|
|
and CPRMASK
|
|
beq L2E99
|
|
lda #$FF
|
|
L2E99:
|
|
jmp FLOAT
|
|
|
|
.ifdef SYM1
|
|
LCDBD:
|
|
jsr CHRGET
|
|
jsr CHKOPN
|
|
jsr FRMEVL
|
|
jsr CHRGOT
|
|
cmp #$29
|
|
beq LCDF1
|
|
jsr AYINT
|
|
lda FAC+4
|
|
ldy FAC+3
|
|
sta USR+1
|
|
sty USR+2
|
|
LCDD8:
|
|
jsr CHKCOM
|
|
jsr FRMEVL
|
|
jsr CHRGOT
|
|
cmp #$29
|
|
beq LCDF1
|
|
jsr AYINT
|
|
lda FAC+3
|
|
pha
|
|
lda FAC+4
|
|
pha
|
|
jmp LCDD8
|
|
|
|
LCDF1:
|
|
jsr CHRGET
|
|
jsr AYINT
|
|
lda FAC+3
|
|
ldy FAC+4
|
|
jmp USR
|
|
|
|
LCDFE:
|
|
lda ZD4
|
|
pha
|
|
lda ZD3
|
|
pha
|
|
jsr CHRGET
|
|
cmp #$22
|
|
bne LCE49
|
|
jsr CHRGET
|
|
jsr LCE2B
|
|
tax
|
|
jsr CHRGOT
|
|
jsr LCE2B
|
|
pha
|
|
jsr CHRGOT
|
|
cmp #$22
|
|
bne LCE48
|
|
jsr CHRGET
|
|
pla
|
|
tay
|
|
pla
|
|
pla
|
|
txa
|
|
jmp GIVAYF
|
|
|
|
LCE2B:
|
|
jsr ASCNIB
|
|
bcs LCE47
|
|
pha
|
|
jsr CHRGET
|
|
jsr ASCNIB
|
|
sta FAC+4
|
|
bcs LCE46
|
|
jsr CHRGET
|
|
pla
|
|
asl a
|
|
asl a
|
|
asl a
|
|
asl a
|
|
ora FAC+4
|
|
rts
|
|
|
|
LCE46:
|
|
pla
|
|
LCE47:
|
|
pla
|
|
LCE48:
|
|
pla
|
|
LCE49:
|
|
pla
|
|
sta ZD3
|
|
pla
|
|
sta ZD4
|
|
jmp ZERO_FAC
|
|
.endif
|