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Mod2Int.S
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7806 lines (7805 loc) · 199 KB
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;Name : MOD2INT.S
;End of file : 110,115
REP 50
; Modula-2 Interpreter for Apple DOS 3.3
; Assembler: EdAsm (ProDOS version)
REP 50
; The M-Code Interpreter is loaded
; into Language Card Bank 2
; This section of the code is specific
; to the Apple II.
REP 50
ORG $D000
LDA $FF ;Set to -1 by HELLO program
STA CaseMsk ;upper case mask
;
; Check for presence of 80-col card
;
LDA BasicIn
CMP #$38
BNE Setup1
LDA BasicOut
CMP #$18
BNE Setup1
LDA XC30B
CMP #$01 ;Pascal v1.1 protocol?
BNE Setup1 ;No
LDA XC30C ;Device signature byte
AND #$F0 ;$8x -> 80-col card
CMP #$80
BNE Setup1 ;No 80-col card
;
; Patch MeDOS's I/O hooks.
;
LDA PInit
STA IMM1+1
LDA PRead
STA IMM2+1
LDA PWrite
STA IMM3+1
LDA PStat
STA IMM4+1
;
JSR InitVideo ;Init video card
LDA #-1
STA Has80Col
;
Setup1 LDA M2Out
STA CSWL
LDA M2Out+1
STA CSWH
;
LDA #$00
STA SOFTEV+1
JSR X03DC ;Get DOS 3.3 FileMgr's
STY CCBPtr ; parmlist & save it
STA CCBPtr+1
JMP doInit ;Initialise the Interpreter
REP 50
; Save on expression stack ($A0-$BF)
; which is built towards high mem.
; Ref Lilith mcode interpreter manual
;
RstExpStk SEC
LDA SReg
SBC #2
STA SReg
LDA SReg+1
SBC #0
STA SReg+1 ;DEC(S)
LDY #1
LDA (SReg),Y
STA NumWords ;c:=stk[S]
BEQ doRTS ;empty expr stack
;
; WHILE c > 0
;
RstLoop SEC
LDA SReg
SBC #2
STA SReg
LDA SReg+1
SBC #0
STA SReg+1 ;DEC(S)
;
LDY #1
LDA (SReg),Y ;Get word &
STA ExprStack,X ; save on empty slot
INX ; b4 incr the "stack ptr"
DEY
LDA (SReg),Y
STA ExprStack,X ;push(stk[S])
INX
DEC NumWords ;DEC(c)
BNE RstLoop ;Continue loop
doRTS RTS
;
NumWords DFB 0 ;max=16 words
REP 50
; Set/Restore the registers
; When called by doInit, the various regs are set using
; values from the SEK.ABS file. Their initial values are
; (P)=$2186 (G)=$0800 (L)=$2198 (S)= $21A0
; (H)=$A8D0 (F)=$0960 (Z8E)=$00C4 (PC)=$0A24
;
RstRegs PHP ;Carry bit=changeMask
LDY #0
INY
LDA (PReg),Y ;$00
ASL A
STA GReg
DEY
LDA (PReg),Y ;$04
ROL A
STA GReg+1 ;(GReg)=$0800
;
INY
INY
INY
LDA (PReg),Y ;$CC
ASL A
STA LReg
DEY ;2
LDA (PReg),Y ;$10
ROL A
STA LReg+1 ;(LReg)=$2198
;
INY
INY ;4
LDA (PReg),Y
STA Z8E+1 ;$00
INY
LDA (PReg),Y ;$C4
STA Z8E ;(Z8E)=$00C4 - byte offset fr code frame
;
INY
PLP ;Is changeMask TRUE?
BCC SkipM ;No
;
LDA (PReg),Y
STA MReg+1 ;$0000
INY
LDA (PReg),Y
STA MReg
INY
;
SkipM LDY #8
INY
LDA (PReg),Y ;$D0
ASL A
STA SReg
DEY
LDA (PReg),Y ;$10
ROL A
STA SReg+1 ;(SReg)=$21A0
;
INY
INY
INY
LDA (PReg),Y ;$80
ASL A
STA HReg
DEY
LDA (PReg),Y ;$54
ROL A
STA HReg+1 ;(HReg)=$A900
INY
INY ;not needed
;
SEC
LDA HReg
SBC #24*2
STA HReg
LDA HReg+1
SBC #0
STA HReg+1 ;(HReg)=$A8D0
;
; (F-Reg) is set to code frame of module 0
; (SYSTEM) if called by doInit
;
LDY #0
INY
LDA (GReg),Y ;$96
ASL A
STA FReg
DEY
LDA (GReg),Y ;$00
ROL A
STA FReg+1
INY
INY
ASL FReg
ROL FReg+1
ASL FReg
ROL FReg+1
ASL FReg
ROL FReg+1 ;x16 -> $0960
;
CLC
LDA FReg
ADC Z8E
STA PC
LDA FReg+1
ADC Z8E+1
STA PC+1 ;=$0A24 -> Call System.main
JSR RstExpStk
RTS
REP 50
; Save a stack frame?
; Valid data fr the Expression stack are saved.
; The process descriptor is then updated.
; Input
; PC, PReg, LReg, MReg, SReg
; Output
; GReg, FReg, HReg
;
SaveRegs JSR SaveExpStack
LDY #0
LDA GReg+1
LSR A
STA (PReg),Y
LDA GReg
ROR A
INY
STA (PReg),Y ;stk[P] := G
;
LDY #2
LDA LReg+1
LSR A
STA (PReg),Y
LDA LReg
ROR A
INY
STA (PReg),Y ;stk[P+1] := L
;
LDY #4+1
SEC
LDA PC
SBC FReg
STA (PReg),Y ;offset from code frame
LDA PC+1
SBC FReg+1
DEY
STA (PReg),Y ;stk[P+2] := PC-F
;
LDY #6+1
LDA MReg
STA (PReg),Y
LDA MReg+1
DEY
STA (PReg),Y ;stk[P+3] := M
;
LDY #8
LDA SReg+1
LSR A
STA (PReg),Y
LDA SReg
ROR A
INY
STA (PReg),Y ;stk[P+4] := S
;
LDY #10+1
LDA HReg+1
LSR A
STA Z86+1 ;Save temporarily
LDA HReg
ROR A
CLC
ADC #24
STA (PReg),Y
LDA Z86+1
ADC #0
DEY
STA (PReg),Y ;stk[P+5] := H+24
RTS
REP 50
; Only relevant data fr the expr stack are
; saved onto the program stack. A word
; denoting the # of words saved is appended.
;
SaveExpStack LDY #0
PshLoop CPX #0 ;Is stack empty?
BEQ NoMore ;Yes -> done
DEX
LDA ExprStack,X
STA (SReg),Y ;stk[S] := pop();
INY
BNE PshLoop ;Always
;
; Append # of words saved
;
NoMore LDA #0
STA (SReg),Y
TYA
LSR A ;# of words
INY
STA (SReg),Y ;stk[S] := # of words
INY
CLC
TYA
ADC SReg
STA SReg
BCC *+4
INC SReg+1 ;Point @ next empty slot
RTS
REP 50
; Assumes SEK.ABS is already loaded
;
doInit LDA #0
STA ExprStkP
STA ExprStkP+1
TAX ;=0
LDA X0800+9 ;$C3 -> init P-Reg
ASL A
STA PReg
LDA X0800+8 ;$10
ROL A
STA PReg+1 ;P := stk[4] = $10C3x2=$2186
SEC ;changeMask := TRUE
JSR RstRegs ;Init regs using SEK.ABS loaded @ $0800
JMP MainLoop
REP 50
; Interpreter's Main Loop
;
MainLoop LDY KBD ;Is there a keypress?
BPL GetCode ;No
CPY #CTRLC+$80 ;Abort?
BNE GetCode ;No
;
BIT KBSTRB ;Clear
BIT X0800+13 ;bootCode (boot flag)
BVC GetCode
LDA #stopped
JSR TrapProc
;
GetCode LDY #0
LDA (PC),Y ;Get instruction
INC PC
BNE *+4
INC PC+1
ASL A ;double to form an index
TAY
BCS Exec2
;
; Instructions $00-$7F
;
LDA JmpT,Y ;Get JMP addr lo
STA IReg
LDA JmpT+1,Y
STA IReg+1
JMP (IReg)
;
; Instructions $80-$FF
;
Exec2 LDA JmpT2,Y
STA IReg
LDA JmpT2+1,Y
STA IReg+1
JMP (IReg)
REP 50
; Jump tables
;
JmpT DW LI0
DW LI1
DW LI2
DW LI3
DW LI4
DW LI5
DW LI6
DW LI7
DW LI8
DW LI9
DW LI10
DW LI11
DW LI12
DW LI13
DW LI14
DW LI15
DW LIB
DW LD4DD ;21C
DW LIW
DW LID
DW LLA
DW LGA
DW LSA
DW LEA
DW JPC
DW JP
DW JPFC
DW JPF
DW JPBC
DW JPB
DW ORJP
DW ANDJP
;
DW LLW
DW LLD
DW LEW
DW LED
DW LLW4
DW LLW5
DW LLW6
DW LLW7
DW LLW8
DW LLW9
DW LLW10
DW LLW11
DW LLW12
DW LLW13
DW LLW14
DW LLW15
DW SLW
DW SLD
DW SEW
DW SED
DW SLW4
DW SLW5
DW SLW6
DW SLW7
DW SLW8
DW SLW9
DW SLW10
DW SLW11
DW SLW12
DW SLW13
DW SLW14
DW SLW15
;
DW LGW
DW LGD
DW LGW2
DW LGW3
DW LGW4
DW LGW5
DW LGW6
DW LGW7
DW LGW8
DW LGW9
DW LGW10
DW LGW11
DW LGW12
DW LGW13
DW LGW14
DW LGW15
DW SGW
DW SGD
DW SGW2
DW SGW3
DW SGW4
DW SGW5
DW SGW6
DW SGW7
DW SGW8
DW SGW9
DW SGW10
DW SGW11
DW SGW12
DW SGW13
DW SGW14
DW SGW15
;
DW LSW0
DW LSW1
DW LSW2
DW LSW3
DW LSW4
DW LSW5
DW LSW6
DW LSW7
DW LSW8
DW LSW9
DW LSW10
DW LSW11
DW LSW12
DW LSW13
DW LSW14
DW LSW15
DW SSW0
DW SSW1
DW SSW2
DW SSW3
DW SSW4
DW SSW5
DW SSW6
DW SSW7
DW SSW8
DW SSW9
DW SSW10
DW SSW11
DW SSW12
DW SSW13
DW SSW14
DW SSW15
;
JmpT2 DW LSW
DW LSD
DW LSD0
DW LXFW
DW LSTA
DW LXB
DW LXW
DW LXD
DW DADD
DW DSUB
DW DMUL
DW DDIV
DW LDE4A
DW LDE4A
DW DSHL
DW DSHR
DW SSW
DW SSD
DW SSD0
DW SXFW
DW TS
DW SXB
DW SXW
DW SXD
DW FADD
DW FSUB
DW FMUL
DW FDIV
DW FCMP
DW FABS
DW FNEG
DW FFCT
;
DW READ
DW WRITE
DW DSKR
DW DSKW
DW SETRK
DW UCHK
DW ESC
DW SYS
DW ENTP
DW EXP
DW ULSS
DW ULEQ
DW UGTR
DW UGEQ
DW TRA
DW RDS
DW LODFW
DW LODFD
DW STORE
DW STOFV
DW STOT
DW COPT
DW DECS
DW PCOP
DW UADD
DW USUB
DW UMUL
DW UDIV
DW UMOD
DW ROR ;$E5BB
DW SHL
DW SHR
;
DW FOR1
DW FOR2
DW ENTC
DW EXC
DW TRAP
DW CHK
DW CHKZ
DW CHKS
DW EQL
DW NEQ
DW LSS
DW LEQ
DW GTR
DW GEQ
DW ABS
DW NEG
DW OR
DW XOR
DW AND ;$E9CC
DW COM
DW IN
DW LIN
DW MSK
DW NOT
DW ADD
DW SUB
DW MUL
DW DIV
DW InstrErr
DW BIT ;$EC03
DW NOP ;$EC0B
DW MOVF
;
DW MOV
DW CMP ;$EC69
DW DDT
DW REPL
DW BBLT
DW DCH
DW UNPK
DW PACK
DW GB
DW GB1
DW ALOC
DW ENTR
DW RTN ;$EE11
DW CX
DW CI
DW CF
DW CL
DW CL1
DW CL2
DW CL3
DW CL4
DW CL5
DW CL6
DW CL7
DW CL8
DW CL9
DW CL11
DW CL10
DW CL12
DW CL13
DW CL14
DW CL15
REP 50
; Load Immediate - LI0-LI15 involves "pushing"
; values 0-15 onto the expression stack ($A0-$BF)
; which grows towards high mem.
;
LI0 LDA #0
STA ExprStack,X
INX
STA ExprStack,X
INX
JMP MainLoop
;
LI1 LDA #1
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI2 LDA #2
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI3 LDA #3
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI4 LDA #4
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI5 LDA #5
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI6 LDA #6
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI7 LDA #7
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI8 LDA #8
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI9 LDA #9
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI10 LDA #10
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI11 LDA #11
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI12 LDA #12
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI13 LDA #13
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI14 LDA #14
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
;
LI15 LDA #15
STA ExprStack,X
INX
LDA #0
STA ExprStack,X
INX
JMP MainLoop
REP 50
; Load Immediate Byte
;
LIB LDY #0 ;Get byte fr code stream
LDA (PC),Y ;next()
INC PC
BNE *+4
INC PC+1
;
STA ExprStack,X ; and 'push' it onto
INX
LDA #0
STA ExprStack,X ; the expression stack
INX
JMP MainLoop
REP 50
; Reserved for use by compiler
;
LD4DD LDA #instrChk
JSR TrapProc
JMP MainLoop
REP 50
; Load Immediate Word
; Use to generate constants
; The loaded value is the parameter itself
;
LIW LDY #0
LDA (PC),Y ;Get byte from code stream
INC PC
BNE *+4
INC PC+1
STA ExprStack+1,X ; & save on expr stack
;
LDY #0
LDA (PC),Y ;next2()
INC PC
BNE *+4
INC PC+1
STA ExprStack,X
INX
INX
JMP MainLoop
REP 50
; Load Immediate Double Word
;
LID LDY #0
LDA (PC),Y ;Big Endian
INC PC
BNE *+4
INC PC+1
STA ExprStack+1,X
;
LDY #0
LDA (PC),Y
INC PC
BNE *+4
INC PC+1 ;next2()
STA ExprStack,X
;
LDY #0
LDA (PC),Y
INC PC
BNE *+4
INC PC+1
STA ExprStack+2+1,X
;
LDY #0
LDA (PC),Y
INC PC
BNE *+4
INC PC+1 ;next2()
STA ExprStack+2,X
INX
INX
INX
INX
JMP MainLoop
REP 50
; Load Local Address onto the expr stack
; Use when assigning pointers & when
; passing parameters by reference
;
LLA LDA LReg+1 ;Calc local addr
LSR A ; in terms of words
STA Z84+1
LDA LReg
ROR A
STA Z84
;
LDY #0
LDA (PC),Y ;next() - offset
INC PC
BNE *+4
INC PC+1
CLC
ADC Z84 ;L+next()
STA ExprStack,X ;push(L+next())
INX
LDA #0
ADC Z84+1
STA ExprStack,X
INX
JMP MainLoop
REP 50
; Load Global Address
;
LGA LDA GReg+1
LSR A ;express in words
STA Z84+1
LDA GReg
ROR A
STA Z84
;
LDY #0
LDA (PC),Y ;next()
INC PC
BNE *+4
INC PC+1
;
CLC
ADC Z84 ;G+next()
STA ExprStack,X ;addr
INX
LDA #0
ADC Z84+1
STA ExprStack,X ;push(G+next())
INX
JMP MainLoop
REP 50
; Load Stack Address
; Add offset to addr on stack
;
LSA LDY #0
LDA (PC),Y ;next() - offset
INC PC
BNE *+4
INC PC+1
CLC
ADC ExprStack-2,X
STA ExprStack-2,X
BCC *+4
INC ExprStack-2+1,X
JMP MainLoop
REP 50
; Load External Address
; External mode: Use for external variables
; imported from other modules
;
LEA LDY #0
LDA (PC),Y ;next() -> module #
INC PC
BNE *+4
INC PC+1
ASL A ;x2 to form an index
STA Z84
;
LDY #0
LDA (PC),Y ;next() -> offset in words
INC PC
BNE *+4
INC PC+1
;
LDY Z84
CLC
ADC DFTab+1,Y ;addr in words
STA ExprStack,X ;push(stk[dft+next()]+next())
INX
LDA #0
ADC DFTab,Y
STA ExprStack,X
INX
JMP MainLoop
REP 50
; Jump Conditional
;
JPC DEX
DEX
LDA ExprStack,X ;Is pop() = 0? (false)
BEQ JP ;Yes
;
LDY #0
LDA (PC),Y
INC PC
BNE *+4
INC PC+1
;
LDY #0
LDA (PC),Y
INC PC
BNE *+4
INC PC+1 ;INC(PC,2)
JMP MainLoop
REP 50
; Jump
;
JP LDY #0
LDA (PC),Y ;hi-byte (Big E)
PHA
INY
LDA (PC),Y ;lo-byte
CLC
ADC PC ;PC := PC + next2();
STA PC
PLA
ADC PC+1
STA PC+1
JMP MainLoop
REP 50
; Jump Forward Conditional
;
JPFC DEX
DEX
LDA ExprStack,X ;Is pop() = 0?
BEQ JPF ;Yes
;
LDY #0
LDA (PC),Y
INC PC
BNE *+4
INC PC+1 ;INC(PC)
JMP MainLoop
REP 50
; Jump Forward
;
JPF LDY #0
LDA (PC),Y ;Get a code byte
CLC
ADC PC ;PC := PC + next();
STA PC
BCC *+4
INC PC+1
JMP MainLoop
REP 50
; Jump Backward Conditional
;
JPBC DEX
DEX
LDA ExprStack,X ;Is pop() = 0?
BEQ JPB ;Yes
;
LDY #0
LDA (PC),Y
INC PC
BNE *+4