A2osX/BIN/ASM.S.EXP.txt

NEW
  AUTO 3,1
*---------------------------------------
* EXP.Modifiers:
* # : 8b,Byte 1
* / : 8b,Byte 2
* ^ : 8b,Byte 3
* < : 24b,Byte 1,2,3
* > : 32b
*---------------------------------------
* Num Format : 0-9 -> decimal
* 				$ = Hex
*				% = binary
*               & = octal
*               * = PC
*---------------------------------------
EXP.Eval.Missing
				lda #E.MISSING.EXP
				sec
				rts

EXP.Eval		>STZ.G EXP.Modifier
				>STA.G EXP.Prefix
				>STA.G EXP.Operator

				jsr SRC.GetChar
				bcs EXP.Eval.Missing

				jsr SRC.IsMODReserved
				bcs EXP.Eval.Next

				txa
				>STA.G EXP.Modifier

				lda #'#'
				>STA.G EXP.Prefix

EXP.Eval.Next0	jsr SRC.GetNextChar

EXP.Eval.Next	stz SRC.ACC
				stz SRC.ACC+1
				stz SRC.ACC+2
				stz SRC.ACC+3

				jsr SRC.GetChar
				bcs EXP.Eval.Missing

				cmp #'.'				Local Label?
				bne .12

				>LDA.G MAC.StkPtr
				bne .9					illegal INSIDE macro

				bra .13

.12				cmp #':'
				bne .14

				>LDA.G MAC.StkPtr
				beq .9					illegal OUTSIDE macro

.13				jsr EXP.GetLocal
				bcs .99

				jmp EXP.EvalOperator

.14				cmp #'*'
				bne .10

				jsr SYM.PC2Acc

				jsr SRC.GetNextChar
				jmp EXP.EvalOperator

.9				lda #E.INV.LABEL
				sec
.99				rts
*---------------------------------------
.10				jsr SRC.IsDigit10		Decimal constant ?
				bcs .1

				jsr SRC.GetDecimal
				bcs EXP.EvalExitRTS
				jmp EXP.EvalOperator

.1				cmp #'$'			Hex?
				bne .2

				jsr SRC.GetHex
				bcs EXP.EvalExitRTS
				jmp EXP.EvalOperator

.2				cmp #'%'			binary?
				bne .3

				jsr SRC.GetBinary
				bcs EXP.EvalExitRTS
				jmp EXP.EvalOperator

.3				cmp #'&'			octal?
				bne .4

				jsr SRC.GetOctal
				bcs EXP.EvalExitRTS
				bra EXP.EvalOperator

.4				cmp #'''
				bne .43

				jsr SRC.GetNextChar
				bcs EXP.EvalExitSYN
				jsr EXP.SetAccA
				jsr SRC.GetNextChar
				bcs EXP.EvalOperator

				cmp #'''
				beq .44

				cmp #','
				bne EXP.EvalExitSYN

				bra EXP.EvalOperator

.44				jsr SRC.GetNextChar
				bra EXP.EvalOperator

.43				cmp #'"'
				bne .42

				jsr SRC.GetNextChar
				bcs EXP.EvalExitSYN

				ora #$80
				jsr EXP.SetAccA
				jsr SRC.GetNextChar
				bcs EXP.EvalOperator

				cmp #'"'
				beq .45

				cmp #','
				bne EXP.EvalExitSYN
				bra EXP.EvalOperator

.45				jsr SRC.GetNextChar
				bra EXP.EvalOperator

.42				jsr SRC.IsLetter		Symbol ?
				bcs EXP.EvalExitSYN

				jsr SYM.LookupGlobal
				bcc EXP.EvalOperator
EXP.EvalExitRTS	rts

EXP.EvalExitOK	>LDA.G EXP.Modifier
				beq .1

				asl
				tax

				lda #SYMG.F.FWREF		Reset FW flag because of IMM modifier
				trb SRC.ACC.F

				jmp (J.EXP.MOD-2,x)

.1				clc
				rts

EXP.EvalExitSYN	lda #E.SYNTAX.ERROR
				sec
				rts

EXP.EvalExitUND	lda #E.UNDEF.SYMBOL
				sec
				rts
*---------------------------------------
EXP.EvalOperator
				>LDA.G EXP.Operator
				beq .7					no previous OP....

				asl
				tax
				
				lda SRC.ACC.F
				ora SRC.ARG.F
				and #SYMG.F.FWREF
				tsb SRC.ACC.F
				
				jsr EXP.Compute			ARG op ACC -> ACC
				bcc .7

				tax
				>LDA.G ASM.PASS
				beq .7					Ignore error ...

				txa
				rts

.7				jsr SRC.GetChar
				bcs EXP.EvalExitOK

				cmp #C.SPACE
				beq EXP.EvalExitOK

				jsr SRC.IsAMReserved
				bcc EXP.EvalExitOK

				jsr SRC.IsEXPReserved
				bcs EXP.EvalExitSYN

				txa
				>STA.G EXP.Operator

				ldx #3

.8				lda SRC.ACC,x
				sta SRC.ARG,x
				dex
				bpl .8

				lda SRC.ACC.F
				sta SRC.ARG.F
				
				jmp EXP.Eval.Next0
*---------------------------------------
EXP.GetLocal	jsr SRC.GetNextChar
				bcs .9

				jsr SRC.GetDecimal8
				bcs EXP.EvalExitSYN

				tax

				jsr SYM.LookupLocalX
				bcc .8

				>LDA.G ASM.PASS			pass#2?
				bne EXP.EvalExitUND

				lda #SYMG.F.FWREF
				tsb SRC.ACC.F

				lda #2
				sta SRC.ACC.SIZE

				lda #$ff
				sta SRC.ACC
				sta SRC.ACC+1

				clc
				rts

.9				lda #E.SYNTAX.ERROR
				sec

.8				rts
*---------------------------------------
EXP.MOD.8.3		lda SRC.ACC+2
				bra EXP.MOD.8

EXP.MOD.8.2		lda SRC.ACC+1

EXP.MOD.8		sta SRC.ACC

EXP.MOD.8.1		lda #1
				sta SRC.ACC.SIZE
				clc
				rts

EXP.MOD.24		lda #3
				sta SRC.ACC.SIZE
				clc
				rts

EXP.MOD.32		lda #4
				sta SRC.ACC.SIZE
				clc
				rts
*---------------------------------------
EXP.Compute		jmp (J.EXP.OP-2,x)
*---------------------------------------
EXP.OP.EOR		ldx #3

.1				lda SRC.ARG,x
				eor	SRC.ACC,x
				sta SRC.ACC,x
				dex
				bpl .1
				rts
*---------------------------------------
EXP.OP.ORA		ldx #3

.1				lda SRC.ARG,x
				ora	SRC.ACC,x
				sta SRC.ACC,x
				dex
				bpl .1
				rts
*---------------------------------------
EXP.OP.AND		ldx #3

.1				lda SRC.ARG,x
				and	SRC.ACC,x
				sta SRC.ACC,x
				dex
				bpl .1
				rts
*---------------------------------------
EXP.OP.EQU		ldx #0					ARG-ACC->ACC
				ldy #4

				clc						if not Equals, return 0

.1				lda SRC.ARG,x
				eor	SRC.ACC,x
				bne .2

				inx
				dey
				bne .1

				sec						equals, return 1

.2				lda #0
				rol
				jmp EXP.SetAccA
*---------------------------------------
EXP.OP.LWR		jsr EXP.SUB
				bcc .2

				ldx #3
	
.1				lda SRC.ACC,x
				bne .2
				
				dex
				bpl .1
				
				clc
				
.2				lda #0
				rol
				jmp EXP.SetAccA
*---------------------------------------
EXP.OP.GRT		jsr EXP.SUB
				bcc .2

				ldx #3
	
.1				lda SRC.ACC,x
				bne .2
				
				dex
				bpl .1
				
				clc

.2				lda #0
				rol
				jmp EXP.SetAccA
*---------------------------------------
EXP.OP.ADD		ldx #0					ARG-ACC->ACC
				ldy #4

				clc

.1				lda SRC.ARG,x
				adc	SRC.ACC,x
				sta SRC.ACC,x
				inx
				dey
				bne .1

				bcc .8

				lda #E.VAL.TOO.BIG
.8				rts
*---------------------------------------
EXP.OP.SUB		jsr EXP.SUB
				bcs .8

				lda #E.VAL.TOO.BIG
				sec
				rts

.8				clc
				rts
*---------------------------------------
EXP.SUB			ldx #0					ARG-ACC->ACC
				ldy #4

				sec

.1				lda SRC.ARG,x
				sbc	SRC.ACC,x
				sta SRC.ACC,x
				inx
				dey
				bne .1
				
				rts
*---------------------------------------
EXP.OP.MUL		>PUSHL SRC.ARG
				>PUSHL SRC.ACC
				>FPU uMUL
				>PULLL SRC.ACC
				clc
				rts
*---------------------------------------
EXP.OP.DIV		>PUSHL SRC.ARG
				>PUSHL SRC.ACC
				>FPU uDIV
				>PULLL SRC.ACC
				clc
				rts
*---------------------------------------
EXP.ResetAcc	stz SRC.ACC.F

EXP.ResetAccV	lda #2
				sta SRC.ACC.SIZE

				stz SRC.ACC
				stz SRC.ACC+1
				stz SRC.ACC+2
				stz SRC.ACC+3
				rts
*---------------------------------------
EXP.SetAccA		sta SRC.ACC
				stz SRC.ACC+1
				stz SRC.ACC+2
				stz SRC.ACC+3
				lda #1
				sta SRC.ACC.SIZE
				clc
				rts
*---------------------------------------
				.DO ASMDBG=1
EXP.DBG			>SYSCALL putchar
				>PUSHW L.MSG.DBG
				>PUSHB.G MAC.CtxID
				>PUSHL SRC.ARG
				>PUSHL SRC.ACC
				>PUSHB SRC.ACC.F
				>PUSHB SRC.ACC.SIZE
				>PUSHBI 11
				>SYSCALL PrintF
*				>DEBUG
				rts
				.FIN
*---------------------------------------
MAN
SAVE usr/src/bin/asm.s.exp
LOAD usr/src/bin/asm.s
ASM