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A2osX/BIN/BF.S.txt

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Brian's work....no additional comment required....pfff
2021-12-02 21:28:26 +00:00
NEW
AUTO 3,1
.LIST OFF
.OP 65C02
.OR $2000
.TF bin/bf
*--------------------------------------
.INB inc/macros.i
.INB inc/a2osx.i
.INB inc/mli.i
.INB inc/mli.e.i
*--------------------------------------
BF.DATASIZE .EQ 1024
*--------------------------------------
* Zero Page Segment, up to 32 bytes
*--------------------------------------
.DUMMY
.OR ZPBIN
ZS.START
ZPCodePtr .BS 2
ZPDataPtr .BS 2
ZPPtr1 .BS 2
ZPPtr2 .BS 2
ZPPtr3 .BS 2
ArgIndex .BS 1
hFileBuf .BS 1
hDataBuf .BS 1
bDebug .BS 1
bTrace .BS 1
StackCnt .BS 1
ZPCnt .BS 1
ZS.END .ED
*--------------------------------------
* File Header (16 Bytes)
*--------------------------------------
CS.START cld
jmp (.1,x)
.DA #$61 6502,Level 1 (65c02)
.DA #1 BIN Layout Version 1
.DA #0 S.PS.F.EVENT
.DA #0
.DA CS.END-CS.START Code Size (without Constants)
.DA DS.END-DS.START Data SegmentSize
.DA #64 Stack Size
.DA #ZS.END-ZS.START Zero Page Size
.DA 0
*--------------------------------------
* Relocation Table
*--------------------------------------
.1 .DA CS.INIT
.DA CS.RUN
.DA CS.DOEVENT
.DA CS.QUIT
L.MSG.GREETINGS .DA MSG.GREETINGS
L.MSG.USAGE .DA MSG.USAGE
L.MSG.ECHOCRLF .DA MSG.ECHOCRLF
L.MSG.DEBUG .DA MSG.DEBUG
L.MSG.ERR .DA MSG.ERR
J.BF.KW .DA BF.KW.INCPTR
.DA BF.KW.DECPTR
.DA BF.KW.INCDATA
.DA BF.KW.DECDATA
.DA BF.KW.PUTCHAR
.DA BF.KW.GETCHAR
.DA BF.KW.WHILE
.DA BF.KW.END
.DA 0
*--------------------------------------
* Called once at process creation
* Put code for loading LIB here
*--------------------------------------
CS.INIT clc
CS.INIT.RTS rts
*--------------------------------------
* Called until exit with CS
* if RUN exits with CC, RN entered again
*--------------------------------------
CS.RUN >PUSHW L.MSG.GREETINGS
>PUSHW A2osX.KVER
>PUSHBI 2
>SYSCALL PrintF
bcs CS.INIT.RTS
jsr CS.RUN.ARGS
bcs CS.INIT.RTS
jsr BF.Init
bcs CS.INIT.RTS
.1 >SLEEP
>LDA.G bDebug
bpl .2
jsr PrintDebugMsg
.2 >LDA.G bTrace
bpl .3
jsr PrintTraceMsg
.3 jsr BF.Run
bcc .1
cmp #MLI.E.EOF
beq .8
pha
jsr PrintErrMsg
pla
sec
rts
.8 lda #0 Exit Code = Success
sec
rts
*--------------------------------------
CS.RUN.ARGS inc ArgIndex
lda ArgIndex
>SYSCALL ArgV
bcs .7
>STYA ZPPtr1
lda (ZPPtr1)
cmp #'-'
bne .4
ldy #1
lda (ZPPtr1),y
ldx #OptionVars-OptionList-1
.1 cmp OptionList,x
beq .2
dex
bpl .1
bra .90
.2 ldy OptionVars,x
lda #$ff
sta $0,y
bra CS.RUN.ARGS
.4 lda hFileBuf
bne .90
>LDYA ZPPtr1
jsr CS.RUN.LoadFile
bcs .9
>STYA ZPCodePtr
stx hFileBuf
bra CS.RUN.ARGS
.7 lda hFileBuf
beq .90
clc
.9 rts
.90 >PUSHW L.MSG.USAGE
>PUSHBI 0
>SYSCALL PrintF
lda #E.SYN
sec QUIT Process
rts
*--------------------------------------
CS.RUN.LoadFile >SYSCALL LoadTxtFile
bcs .9
phx
txa
>SYSCALL GetMemPtr
plx
.9 rts
*--------------------------------------
BF.Init >LDYAI BF.DATASIZE
>SYSCALL GetMem
bcs .9
>STYA ZPDataPtr
stx hDataBuf
>STYA ZPPtr1
ldx /BF.DATASIZE
lda #0
tay
.1 sta (ZPPtr1),y
iny
bne .1
inc ZPPtr1+1
dex
bne .1
.9 rts
*--------------------------------------
BF.Run jsr BF.GetCodeByte
beq .8
ldx #BF.KW.Cnt-1
.2 cmp BF.KW,x
bne .3
txa
asl
tax
jmp (J.BF.KW,x)
.3 dex
bpl .2
lda #E.CSYN
sec
rts
.8 lda #MLI.E.EOF
sec
rts
*--------------------------------------
BF.KW.INCPTR inc ZPDataPtr
bne .8
inc ZPDataPtr+1
.8 clc
jmp BF.NextCodeByte
*--------------------------------------
BF.KW.DECPTR lda ZPDataPtr
bne .8
dec ZPDataPtr+1
.8 dec ZPDataPtr
clc
jmp BF.NextCodeByte
*--------------------------------------
BF.KW.INCDATA lda (ZPDataPtr)
inc
sta (ZPDataPtr)
clc
jmp BF.NextCodeByte
*--------------------------------------
BF.KW.DECDATA lda (ZPDataPtr)
dec
sta (ZPDataPtr)
clc
jmp BF.NextCodeByte
*--------------------------------------
BF.KW.PUTCHAR lda (ZPDataPtr)
>SYSCALL PutChar
bcs .9
jmp BF.NextCodeByte
.9 rts
*--------------------------------------
BF.KW.GETCHAR >SYSCALL GetChar
bcs .9
sta (ZPDataPtr)
jmp BF.NextCodeByte
.9 rts
*--------------------------------------
BF.KW.WHILE lda (ZPDataPtr)
bne .8
lda #1
sta ZPCnt
.1 jsr BF.NextCodeByte
jsr BF.GetCodeByte
beq .9
cmp #'['
bne .2
inc ZPCnt
bra .1
.2 cmp #']'
bne .1
dec ZPCnt
bne .1
clc
jmp BF.NextCodeByte
.8 >PUSHW ZPCodePtr
inc StackCnt
clc
jmp BF.NextCodeByte
.9 lda #E.ESYN
sec
rts
*--------------------------------------
BF.KW.END lda StackCnt
beq .9
>PULLW ZPCodePtr
dec StackCnt
clc
rts
.9 lda #E.STACKERROR
sec
rts
*--------------------------------------
BF.GetCodeByte lda (ZPCodePtr)
beq .8
cmp #C.SPACE
beq .7
cmp #C.CR
beq .7
cmp #C.LF
beq .7
cmp #'#'
bne .8
.2 jsr BF.NextCodeByte
lda (ZPCodePtr)
beq .8
cmp #C.CR
bne .2
.7 jsr BF.NextCodeByte
bra BF.GetCodeByte
.8 rts
*--------------------------------------
BF.NextCodeByte inc ZPCodePtr
bne .8
inc ZPCodePtr+1
.8 rts
*--------------------------------------
CS.DOEVENT sec
rts
*--------------------------------------
CS.QUIT lda hFileBuf
beq .1
>SYSCALL FreeMem
.1 lda hDataBuf
beq .8
>SYSCALL FreeMem
.8 rts
*--------------------------------------
PrintDebugMsg >LDYA pStack
>STYA ZPPtr2
>PUSHW L.MSG.DEBUG
>PUSHW ZPCodePtr
>PUSHW ZPDataPtr
>PUSHB (ZPDataPtr)
>PUSHW ZPPtr2
>PUSHBI 7
>SYSCALL PrintF
rts
*--------------------------------------
PrintErrMsg >LDA.G bTrace
bmi .5
jsr PrintTraceMsg
.5 lda ZPPtr3
cmp ZPCodePtr
bne .6
lda ZPPtr3+1
cmp ZPCodePtr+1
beq .8
.6 ldy #S.PS.hStdErr
lda (pPS),y
>PUSHA
>PUSHBI '-'
>SYSCALL FPutC
inc ZPPtr3
bne .5
inc ZPPtr3+1
bra .5
.8 ldy #S.PS.hStdErr
lda (pPS),y
>PUSHA
>PUSHW L.MSG.ERR
>PUSHW ZPPtr2 Line counter
>PUSHBI 2
>SYSCALL FPrintF
rts
*--------------------------------------
PrintTraceMsg lda hFileBuf
.12 >SYSCALL GetMemPtr
>STYA ZPPtr1
stz ZPPtr2
stz ZPPtr2+1 Line counter
.1 inc ZPPtr2
bne .2
inc ZPPtr2+1
.2 >LDYA ZPPtr1
>STYA ZPPtr3 save line start
.20 lda (ZPPtr1)
beq .4 EoF
inc ZPPtr1
bne .3
inc ZPPtr1+1
.3 cmp #C.CR
bne .20 Scan until EoL
ldx ZPPtr1
cpx ZPCodePtr
lda ZPPtr1+1
sbc ZPCodePtr+1
bcc .1 not this line....
.4 ldy #S.PS.hStdErr
lda (pPS),y
>PUSHA
>PUSHBI '>'
>SYSCALL FPutC
ldy #$ff
.7 iny
lda (ZPPtr3),y
beq .8
cmp #C.CR
beq .8
phy
pha
ldy #S.PS.hStdErr
lda (pPS),y
>PUSHA
pla
>PUSHA
>SYSCALL FPutC
ply
bra .7
.8 ldy #S.PS.hStdErr
lda (pPS),y
>PUSHA
>PUSHW L.MSG.ECHOCRLF
>PUSHBI 0
>SYSCALL FPrintF
rts
*--------------------------------------
CS.END
*--------------------------------------
* Initialized DATA
*--------------------------------------
MSG.GREETINGS .AZ "\r\nBrainFuck-Shell %d.%d\r\n\r\n"
MSG.USAGE .AS "Usage : BF <option> file\r\n"
.AS " -D : Debug Mode\r\n"
.AS " -T : Trace On"
MSG.ECHOCRLF .AZ "\r\n"
MSG.DEBUG .AZ "pCode=%H, pData=%H(%h), pStack=%H\r\n"
MSG.ERR .AZ "-^\r\nLine #%D:"
*--------------------------------------
OptionList .AS "DdTt"
OptionVars .DA #bDebug,#bDebug,#bTrace,#bTrace
*--------------------------------------
BF.KW .AS "><+-.,[]"
BF.KW.Cnt .EQ *-BF.KW
*--------------------------------------
.DUMMY
.OR 0
DS.START
DS.END .ED
*--------------------------------------
MAN
SAVE usr/src/bin/bf.s
ASM
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