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A2osX/BIN/ASM.S.SRC.txt
Rémy GIBERT 84712111d5 Work In Progress (ASM)
2015-10-30 17:34:59 +01:00

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PR#3
PREFIX /A2OSX.SRC
NEW
INC 1
AUTO 6
.LIST OFF
*---------------------------------------
SRC.ParseLine ldx TmpBuffer256
beq SRC.ParseLine.Skip
cpx #'*' Comment?
beq SRC.ParseLine.Skip
cpx #';' Comment?
beq SRC.ParseLine.Skip
cpx #' ' no label...go scan dir/opcode
beq .4
.1 cpx #'.' local symbol?
bne .2
jsr SRC.ParseLine.SymL
bra .3
.2 jsr SRC.ParseLine.SymG
.3 bcs SRC.ParseLine.Err
.4 jsr SRC.GetCharNB Scan for an Opcode...
beq SRC.ParseLine.Ok
cmp #'.'
bne .5
jsr SRC.ParseLine.Dir
bcs SRC.ParseLine.Err
bra SRC.ParseLine.Ok
.5 cmp #'>'
bne .6
jsr SRC.ParseLine.Exec.Macro
bcs SRC.ParseLine.Err
bra SRC.ParseLine.Ok
.6 dec SRC.BufPtr Back one char...
jsr SRC.ParseLine.OpCode
bcs SRC.ParseLine.Err
SRC.ParseLine.Ok lda SRC.Label.Flags
beq .1
jsr SYM.Add
bcs SRC.ParseLine.Err
.1
SRC.ParseLine.skip clc
rts
SRC.ParseLine.Err1 lda #ERR.INVALID.LABEL
SRC.ParseLine.Err sec
rts
*---------------------------------------
SRC.ParseLine.SymP jsr SRC.GetChar
beq SRC.ParseLine.SymE
jsr SRC.GetDecimal
bcs SRC.ParseLine.SymR
jmp SYM.AddPrivate
*---------------------------------------
SRC.ParseLine.SymL jsr SRC.GetChar
beq SRC.ParseLine.SymE
jsr SRC.GetDecimal
bcs SRC.ParseLine.SymR
jmp SYM.AddLocal
*---------------------------------------
SRC.ParseLine.SymG jsr SYM.ClearLocal
jsr SRC.GetLabel
bcs SRC.ParseLine.SymE
inc SRC.Label.Flags Remember to Add Label
ldx #3 Makes Current Label = PC for now
ldy #ASM.PC
lda (pdata),y
.1 sta SRC.LabelValue,x
dey
dex
bpl .1
clc
rts
SRC.ParseLine.SymE lda #ERR.INVALID.LABEL
sec
SRC.ParseLine.SymR rts
*---------------------------------------
SRC.ParseLine.Dir >LDYA L.T.DIRECTIVES
jsr SRC.GetKeyword
bcs .9
jmp (J.DIRECTIVES,x)
.9 lda #ERR.INVALID.DIRECTIVE
sec
rts
*---------------------------------------
SRC.ParseLine.Exec.Macro
clc
rts
*---------------------------------------
SRC.ParseLine.Add.Macro
clc
rts
*---------------------------------------
SRC.ParseLine.OpCode
jsr SRC.GetArg
bcs .9
ldy #ASM.T.hMem
lda (pData),y
>SYSCALL SYS.GetMemPtrA
>STYA ZPPtr1
ldy #ASM.T.O setup Ptr to Opcodes
lda (ZPPtr1),y
clc
adc ZPPtr1
sta ZPPtr2
iny
lda (ZPPtr1),y
adc ZPPtr1+1
sta ZPPtr2+1
ldy #ASM.T.R setup Ptr to Registers
lda (ZPPtr1),y
clc
adc ZPPtr1
sta ZPPtr3
iny
lda (ZPPtr1),y
adc ZPPtr1+1
sta ZPPtr3+1
.10 lda (ZPPtr2)
ldy #1
ora (ZPPtr2),y
beq .9
ldx #$FF
.1 inx
lda SRC.Buffer,x
iny
cmp (ZPPtr2),y
bne .7
cpx SRC.Buffer
bne .1
jsr SRC.ParseLine.AM
bcs .99
clc
rts
.7 lda ZPPtr1
clc
adc (ZPPtr2)
tax
lda ZPPtr1+1
ldy #1
adc (ZPPtr2),y
stx ZPPtr2
sta ZPPtr2+1
bra .10
.9 lda #ERR.INVALID.OPCODE
sec
.99 rts
*---------------------------------------
SRC.ParseLine.AM stz SRC.AM.ID
stz SRC.AM.StrBuf
.1 jsr SRC.GetCharUC any arg immediately after ' '?
beq .8 no, AM.ID=0 (implied)
cmp #' ' another space ?
beq .8 ignore end of line (comment)
jsr SRC.IsAMReserved
bcs .2
inc SRC.AM.StrBuf
ldx SRC.AM.StrBuf
sta SRC.AM.StrBuf,x
bra .1
.8 lda SRC.AM.StrBuf
beq .89
>PUSHW L.SRC.AM.StrBuf
>PUSHW L.MSG.DEBUG
>LIBCALL hLIBSTR,LIBSTR.PRINTF
.89 clc
rts
.2 jsr SRC.IsLetter Any register?
bcs .70 no, try something else
stz SRC.AM.tmpBuf
sta SRC.AM.tmpBuf+1
inc SRC.AM.tmpBuf
.3 jsr SRC.GetCharUC
beq .4
jsr SRC.IsLetterOrDigit
bne .4
inc SRC.AM.tmpBuf
ldx SRC.AM.tmpBuf
sta SRC.AM.tmpBuf,x
bra .3
.4 dec SRC.BufPtr back one char
ldy #0
.5 lda (ZPPtr3),y
beq .71 last register ?
ldx #$ff
.6 lda (ZPPtr3),y
iny
inx
cmp SRC.AM.tmpBuf,x
bne .7
cpx SRC.AM.tmpBuf
bne .6
ldy #0 register match, add to AM string
ldx SRC.AM.StrBuf
.61 iny
lda SRC.AM.tmpBuf,y
sta SRC.AM.StrBuf,x
inx
cpy SRC.AM.tmpBuf
bne .61
stx SRC.AM.StrBuf
bra .72
.7 iny
bra .5
.70 dec SRC.BufPtr back one char
.71 jsr SRC.GetExp
bcs .99
.72 jmp .1
clc
rts
.9 lda #ERR.INVALID.AM.SYN
sec
.99 rts
*---------------------------------------
SRC.PrintLine bcs .8 if CS, unconditional
ldy #ASM.MACRO.ON
lda (pData),y
bpl .1
ldy #ASM.LI.CON
lda (pData),y
bpl .9
bmi .8
.1 ldy #ASM.LI.ON
lda (pData),y
bpl .9
.8 >PUSHWI TmpBuffer256
>PUSHW SRC.LINENUM
>PUSHW L.MSG.SRCLINE
>LIBCALL hLIBSTR,LIBSTR.PRINTF
.9 rts
*---------------------------------------
SRC.GetDecimal stz SRC.ACC+1
stz SRC.ACC+2
stz SRC.ACC+3
jsr SRC.GetChar
beq .99
jsr SRC.IsDigit10
bcs .99
and #$0F
sta SRC.ACC
.1 jsr SRC.GetChar
beq .8
cmp #' '
beq .8
jsr SRC.IsDigit10
bcs .99
and #$0F
pha
jsr SRC.ACC10
pla
bcs .9
clc
adc SRC.ACC
sta SRC.ACC
bcc .1
inc SRC.ACC+1
bne .1
inc SRC.ACC+2
bne .1
inc SRC.ACC+3
bne .1
.9 lda #ERR.VAL.TOO.BIG
sec
rts
.8 clc
rts
.99 lda #ERR.SYNTAX.ERROR
sec
rts
*---------------------------------------
SRC.GetHex stz SRC.ACC+1
stz SRC.ACC+2
stz SRC.ACC+3
jsr SRC.GetChar
beq .99
jsr SRC.IsDigit16
bcs .99
and #$0F
sta SRC.ACC
.1 jsr SRC.GetChar
beq .8
cmp #' '
beq .8
jsr SRC.IsDigit16
bcs .99
asl
asl
asl
asl
ldx #4
.2 asl
rol SRC.ACC
rol SRC.ACC+1
rol SRC.ACC+2
rol SRC.ACC+3
bcs .9
dex
bne .2
bra .1
.8 clc
rts
.9 lda #ERR.VAL.TOO.BIG
sec
rts
.99 lda #ERR.SYNTAX.ERROR
sec
rts
*---------------------------------------
SRC.GetOctal stz SRC.ACC+1
stz SRC.ACC+2
stz SRC.ACC+3
jsr SRC.GetChar
beq .99
jsr SRC.IsDigit8
bcs .99
and #$0F
sta SRC.ACC
.1 jsr SRC.GetChar
beq .8
cmp #' '
beq .8
jsr SRC.IsDigit8
bcs .99
asl
asl
asl
asl
asl
ldx #3
.2 asl
rol SRC.ACC
rol SRC.ACC+1
rol SRC.ACC+2
rol SRC.ACC+3
bcs .9
dex
bne .2
bra .1
.8 clc
rts
.9 lda #ERR.VAL.TOO.BIG
sec
rts
.99 lda #ERR.SYNTAX.ERROR
sec
rts
*---------------------------------------
SRC.GetBinary stz SRC.ACC+1
stz SRC.ACC+2
stz SRC.ACC+3
jsr SRC.GetChar
beq .99
cmp #'1'
beq .10
cmp #'0'
bne .99
.10 and #$01
sta SRC.ACC
.1 jsr SRC.GetChar
beq .8
cmp #'1'
beq .11
cmp #'0'
bne .8
.11 lsr
rol SRC.ACC
rol SRC.ACC+1
rol SRC.ACC+2
rol SRC.ACC+3
bcs .9
bra .1
.8 clc
rts
.9 lda #ERR.VAL.TOO.BIG
sec
rts
.99 lda #ERR.SYNTAX.ERROR
sec
rts
*---------------------------------------
SRC.GetLabel jsr SRC.GetCharUC
beq .9
jsr SRC.IsLetter
bcs .9
sta SRC.Label
ldy #1
.1 jsr SRC.GetCharUC
beq .8
cmp #' '
beq .8
cmp #'.'
beq .2
jsr SRC.IsLetterOrDigit
bcs .9
.2 sta SRC.Label,y
iny
cpy #SRC.LABEL.MAXLEN
bne .1 if equ Carry is set
.9 sec
rts
.8 lda #0
sta SRC.Label,y
clc
rts
*---------------------------------------
SRC.GetKeyword >STYA ZPPtr1
jsr SRC.GetArg
bcs .9
stz SRC.Keyword.ID
ldy #0
.3 lda (ZPPtr1),y
beq .9
cmp SRC.Buffer
bne .6
phy
ldx #0
.4 iny
inx
lda (ZPPtr1),y
cmp SRC.Buffer,x
bne .5
cpx SRC.Buffer
bne .4
ply
ldx SRC.Keyword.ID
clc
rts
.5 ply
.6 tya
sec Add keyword Len+1
adc (ZPPtr1),y
tay
inc SRC.Keyword.ID
inc SRC.Keyword.ID
bra .3
.9 sec
rts
*---------------------------------------
SRC.GetExp stz SRC.Exp
jsr SRC.GetCharUC
beq .9
ldy #0
jsr SRC.IsAMReserved
bcc .8
iny
sta SRC.Exp+1
.1 jsr SRC.GetCharUC
beq .89
cmp #' '
beq .89
jsr SRC.IsAMReserved
bcc .8
iny
sta SRC.Exp,y
bra .1
.8 dec SRC.BufPtr
.89 sty SRC.Exp
clc
rts
.9 sec
rts
*---------------------------------------
SRC.GetArg jsr SRC.GetCharUC
beq .9
sta SRC.Buffer+1
ldy #1
.1 jsr SRC.GetCharUC
beq .2
cmp #' '
beq .2
iny
sta SRC.Buffer,y
bra .1
.2 sty SRC.Buffer
clc
rts
.9 sec
rts
*---------------------------------------
SRC.IsAMReserved ldx SRC.AM.RESERVED
.1 cmp SRC.AM.RESERVED,x
beq .8
dex
bne .1
sec
rts
.8 clc
rts
*---------------------------------------
SRC.IsEXPReserved ldx SRC.EXP.RESERVED
.1 cmp SRC.EXP.RESERVED,x
beq .8
dex
bne .1
sec
rts
.8 clc
rts
*---------------------------------------
SRC.IsLetterOrDigit jsr SRC.IsDigit10
bcc SRC.IsLetterRTS
*---------------------------------------
SRC.IsLetter cmp #'A'
bcc .9
cmp #'['
bcc SRC.IsLetterRTS
cmp #'a'
bcc .9
cmp #'{'
rts CC if lowercase
.9 sec
SRC.IsLetterRTS rts
*---------------------------------------
SRC.IsDigit16 jsr SRC.IsDigit10
bcc .8
cmp #'A'
bcc .9
cmp #'G'
bcc .1
rts cc if ok, cs if not
.1 sbc #'A'-10 cc so A->10
clc
.8 and #$0F
rts
.9 sec
rts
*---------------------------------------
SRC.IsDigit10 cmp #'0'
bcc .9
cmp #'9'+1
rts cc if ok, cs if not
.9 sec
rts
*---------------------------------------
SRC.IsDigit8 cmp #'0'
bcc .9
cmp #'7'+1
rts cc if ok, cs if not
.9 sec
rts
*---------------------------------------
SRC.GetCharNB jsr SRC.GetCharUC
beq .9
cmp #' '
beq SRC.GetCharNB
.9 rts
*---------------------------------------
SRC.GetCharUC jsr SRC.GetChar
beq .9
cmp #'a'
bcc .9
cmp #'z'+1
bcs .9
eor #$20 to Uppercase
.9 rts
*---------------------------------------
SRC.GetChar ldx SRC.BufPtr
lda TmpBuffer256,x
beq .9
inc SRC.BufPtr if 255, will make Z
and #$7f Make sure NZ
.9 rts
*---------------------------------------
SRC.ACC10 lda SRC.ACC ACC*2-> ACC & ACCTMP
asl
sta SRC.ACC
sta SRC.ACCTMP
lda SRC.ACC+1
rol
sta SRC.ACC+1
sta SRC.ACCTMP+1
lda SRC.ACC+2
rol
sta SRC.ACC+2
sta SRC.ACCTMP+2
lda SRC.ACC+3
rol
sta SRC.ACC+3
sta SRC.ACCTMP+3
bcs .9
ldx #1
.1 asl SRC.ACC ACC=ACC*8
rol SRC.ACC+1
rol SRC.ACC+2
rol SRC.ACC+3
bcs .9
dex
bne .1
lda SRC.ACC CC from ROL SRC.ACC+3
adc SRC.ACCTMP
sta SRC.ACC
lda SRC.ACC+1
adc SRC.ACCTMP+1
sta SRC.ACC+1
lda SRC.ACC+2
adc SRC.ACCTMP+2
sta SRC.ACC+2
lda SRC.ACC+3
adc SRC.ACCTMP+3
sta SRC.ACC+3 CS if overflow
.9 rts
*---------------------------------------
MAN
SAVE BIN/ASM.S.SRC
LOAD BIN/ASM.S
ASM
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