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Disassembler.X68
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2217 lines (1599 loc) · 35.2 KB
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*-----------------------------------------------------------
* Title : X68000 Motarola Disassembler for CSS 422
* Written by : Jacob Ryse, Liam Morrison, Rachel Graham
* Date : 4/16/2022
* Description: Disassembler for the X68000 Motarola CPU
*-----------------------------------------------------------
ORG $1000
**************** START ***************************
START:
LEA WMSG,A1
MOVE.B #14,D0
TRAP #15
ask:
CLR.L D1
CLR.L D2
CLR.L D3
CLR.L D4
CLR.L D5
CLR.L D6
CLR.L D7
LEA msgask,A1
MOVE.B #14,D0
TRAP #15
CLR.L D1
MOVE.B #5,D0
TRAP #15
CMP.B #$79,D1
BNE END
CLR.L D1
LEA SPACE,A1
MOVE.B #14,D0
TRAP #15
LEA msgenter1,A1
MOVE.B #14,D0
TRAP #15
LEA (A2),A1
*First number
MOVE.B #2,D0
TRAP #15
CLR.L D2
CLR.L D3
JSR decode
CMP.L #0,D3
BLE error1
CMP.L #$FFFFFF,D3
BGE error1
MOVE.L D3,D4
LEA msgenter2,A1
MOVE.B #14,D0
TRAP #15
LEA (A2),A1
*Second number
MOVE.B #2,D0
TRAP #15
CLR.L D2
CLR.L D3
JSR decode
CMP.L #0,D3
BLE error1
CMP.L #$FFFFFF,D3
BGE error1
CMP.L D4,D3
BEQ error2
CMP.L D4,D3
BLT error3
CLR.L D5
MOVE.L D3,D5
MOVE.L D4,D3
CLR.L D4
MOVE.L D5,D4
CLR.L D5
CLR.L D2
MOVE.L D3,A5
MOVE.B #0,counter
BRA MainLoop
error1:
LEA msgerror1,A1
MOVE.B #14,D0
TRAP #15
LEA SPACE,A1
MOVE.B #14,D0
TRAP #15
BRA ask
error2:
LEA msgerror2,A1
MOVE.B #14,D0
TRAP #15
LEA SPACE,A1
MOVE.B #14,D0
TRAP #15
BRA ask
error3:
LEA msgerror3,A1
MOVE.B #14,D0
TRAP #15
LEA SPACE,A1
MOVE.B #14,D0
TRAP #15
BRA ask
****************** Main LOOP *************************
MainLoop:
* put instruction into D6
* print out address first, then print rest out in opcode section...
CLR.L D1
MOVE.L A5,D1
CLR.L D2
MOVE.B #16,D2
MOVE.B #15,D0
TRAP #15
LEA msgspace,A1
MOVE.B #14,D0
TRAP #15
MOVE.W (A5)+,D6
JSR opcodes
LEA SPACE,A1
MOVE.B #14,D0
TRAP #15
CLR.L D1
MOVE.B counter,D1
ADDQ #1,D1
MOVE.B D1,counter
* Wait for next user input check
CMP.B #%00011100,counter
BEQ enterwait
CMP.L D4,A5
BLE MainLoop
BRA ask
END:
MOVE.B #9,D0
TRAP #15
enterwait:
MOVE.B #0,counter
LEA msgenter,A1
TRAP #15
MOVE.B #5,D0
TRAP #15
CMP.B #$0D,D1
BEQ MainLoop
BRA enterwait
************** CONVERT INPUT TO HEX ******************
decode:
CMP.B D2,D1
BEQ return
CMP.B #$30,(A2)
BEQ zero
CMP.B #$31,(A2)
BEQ one
CMP.B #$32,(A2)
BEQ two
CMP.B #$33,(A2)
BEQ three
CMP.B #$34,(A2)
BEQ four
CMP.B #$35,(A2)
BEQ five
CMP.B #$36,(A2)
BEQ six
CMP.B #$37,(A2)
BEQ seven
CMP.B #$38,(A2)
BEQ eight
CMP.B #$39,(A2)
BEQ nine
CMP.B #$41,(A2)
BEQ a
CMP.B #$42,(A2)
BEQ b
CMP.B #$43,(A2)
BEQ c
CMP.B #$44,(A2)
BEQ d
CMP.B #$45,(A2)
BEQ e
CMP.B #$46,(A2)
BEQ f
LEA msgerror4,A1
MOVE.B #14,D0
TRAP #15
BRA ask
return:
RTS
zero:
ASL.L #4,D3
ADDI.L #$00,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
one:
ASL.L #4,D3
ADDI.L #$01,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
two:
ASL.L #4,D3
ADDI.L #$02,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
three:
ASL.L #4,D3
ADDI.L #$03,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
four:
ASL.L #4,D3
ADDI.L #$04,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
five:
ASL.L #4,D3
ADDI.L #$05,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
six:
ASL.L #4,D3
ADDI.L #$06,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
seven:
ASL.L #4,D3
ADDI.L #$07,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
eight:
ASL.L #4,D3
ADDI.L #$08,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
nine:
ASL.L #4,D3
ADDI.L #$09,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
a:
ASL.L #4,D3
ADDI.L #$0A,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
b:
ASL.L #4,D3
ADDI.L #$0B,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
c:
ASL.L #4,D3
ADDI.L #$0C,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
d:
ASL.L #4,D3
ADDI.L #$0D,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
e:
ASL.L #4,D3
ADDI.L #$0E,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
f:
ASL.L #4,D3
ADDI.L #$0F,D3
ADDQ #1,A2
ADDQ #1,D2
BRA decode
invalid:
* display invalid message
LEA msginvalid, A1
MOVE.B #14,D0
TRAP #15
* display uncoded hex
MOVE.W -(A5), D1
CLR.L D2
MOVE.B #16,D2
MOVE.B #15,D0
TRAP #15
MOVE.W (A5)+,D1
RTS
******************** OPCODES *************************
* format as -memory location- -opcode- -operand-
* invalids displayed as 1000 DATA -uncoded hex-
* each opcode should branch to the next if it is not that specific opcode
opcodes:
*------Liam-------
*------NOP-------
nop:
CLR.L D5
MOVE.W #$FFFF,D5
AND.W D6,D5
CMP.W #%0100111001110001,D5
BNE movea
LEA msgnop,A1
MOVE.W #14,D0
TRAP #15
RTS
*------MOVEA-------
movea:
CLR.L D5
MOVE.W #%1100000111000000,D5
AND.W D6,D5
CMP.W #%0000000001000000,D5
BNE move
LEA msgmovea,A1
MOVE.B #14,D0
TRAP #15
JSR movesize
*Second part of EA
CLR.L D3
*Add source register to D3
CLR.L D5
MOVE.W #%0000000000000111,D5
AND.W D6,D5
MOVE.W D5,D3
*Add source mode to D3
CLR.L D5
MOVE.W #%0000000000111000,D5
AND.W D6,D5
ADD.W D5,D3
*Add Size to D3
CLR.L D5
MOVE.W #%0011000000000000,D5
AND.W D6,D5
LSR.W #6,D5
ADD.W D5,D3
JSR ea
LEA msgcomma,A1
MOVE.B #14,D0
TRAP #15
*Firest part of EA
CLR.L D3
CLR.L D5
MOVE.W #%0000111000000000,D5
AND.W D6,D5
LSR.W #6,D5
LSR.W #3,D5
ADD.W D5,D3
CLR.L D5
MOVE.W #%0000000111000000,D5
AND.W D6,D5
LSR.W #3,D5
ADD.W D5,D3
*Add Size to D3
CLR.L D5
MOVE.W #%0011000000000000,D5
AND.W D6,D5
LSR.W #6,D5
ADD.W D5,D3
JSR ea
RTS
*------MOVE-------
move:
CLR.L D5
MOVE.W #%1100000000000000,D5
AND.W D6,D5
CMP.W #%0000000000000000,D5
BNE moveq
CLR.L D5
MOVE.W #%0011000000000000,D5
AND.W D6,D5
CMP.W #%0000000000000000,D5
BEQ invalid
CLR.L D5
MOVE.W #%0000000000111000,D5
AND.W D6,D5
CMP.W #%0000000000110000,D5
BEQ invalid
AND.W D6,D5
CMP.W #%0000000000101000,D5
BEQ invalid
LEA msgmove,A1
MOVE.B #14,D0
TRAP #15
JSR movesize
*Second part of EA
CLR.L D3
CLR.L D5
MOVE.W #%0000000000000111,D5
AND.W D6,D5
MOVE.W D5,D3
CLR.L D5
MOVE.W #%0000000000111000,D5
AND.W D6,D5
ADD.W D5,D3
*Add Size to D3
CLR.L D5
MOVE.W #%0011000000000000,D5
AND.W D6,D5
LSR.W #6,D5
ADD.W D5,D3
JSR ea
* Print comma
LEA msgcomma,A1
MOVE.B #14,D0
TRAP #15
*Firest part of EA
CLR.L D3
CLR.L D5
MOVE.W #%0000111000000000,D5
AND.W D6,D5
LSR.W #6,D5
LSR.W #3,D5
ADD.W D5,D3
CLR.L D5
MOVE.W #%0000000111000000,D5
AND.W D6,D5
LSR.W #3,D5
ADD.W D5,D3
*Add Size to D3
CLR.L D5
MOVE.W #%0011000000000000,D5
AND.W D6,D5
LSR.W #6,D5
ADD.W D5,D3
JSR ea
RTS
*------MOVEQ-------
moveq:
CLR.L D5
MOVE.W #%1111000100000000,D5
AND.W D6,D5
CMP.W #%0111000000000000,D5
BNE movem
LEA msgmoveq,A1
MOVE.B #14,D0
TRAP #15
LEA msgspace,A1
MOVE.B #14,D0
TRAP #15
LEA msgim,A1
MOVE.B #14,D0
TRAP #15
LEA msghex,A1
MOVE.B #14,D0
TRAP #15
CLR.L D1
MOVE.W #%0000000011111111,D1
AND.W D6,D1
MOVE.B #16,D2
MOVE.B #15,D0
TRAP #15
* Print comma
LEA msgcomma,A1
MOVE.B #14,D0
TRAP #15
CLR.L D3
CLR.L D5
MOVE.W #%0000111000000000,D5
AND.W D6,D5
LSR.W #7,D5
LSR.W #2,D5
MOVE.W D5,D3
JSR ea
RTS
*------MOVEM-------
movem: ** NOT COMPLETE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
CLR.L D5
MOVE.W #%1111101110000000,D5
AND.W D6,D5
CMP.W #%0100100010000000,D5
BNE add
LEA msgmovem,A1
MOVE.B #14,D0
TRAP #15
JSR movemsize
JSR ea *gonna have to do something more than this
RTS
*------ADD-------
add:
CLR.L D5
MOVE.W #%1111000000000000,D5
AND.W D6,D5
CMP.W #%1101000000000000,D5
BNE addq
* If ADDA then go there
CLR.L D5
MOVE.W #%1111000111000000,D5
AND.W D6,D5
CMP.W #%1101000011000000,D5
BEQ adda
CMP.W #%1101000111000000,D5
BEQ adda
* Must be ADD
LEA msgadd,A1
MOVE.B #14,D0
TRAP #15
JSR addsize
LEA msgspace,A1
MOVE.B #14,D0
TRAP #15
CLR.L D2
MOVE.W #%0000000000000000,D2
BRA addopchoice
RTS
addopchoice:
CLR.L D5
MOVE.W #%0000000111000000,D5
AND.W D6,D5
CMP.W #%0000000100000000,D5
BGE addc2
CLR.L D3
CLR.L D5
MOVE.W #%0000000000111111,D5
AND.W D6,D5
MOVE.W D5,D3
JSR ea
* Print comma
LEA msgcomma,A1
MOVE.B #14,D0
TRAP #15
CLR.L D3
CLR.L D5
MOVE.W #%0000111000000000,D3
AND.W D6,D3
LSR.W #7,D3
LSR.W #2,D3
ADD.W D2,D3 * adds the type of register
JSR ea
RTS
addc2:
CLR.L D3
MOVE.W #%0000111000000000,D3
AND.W D6,D3
LSR.W #7,D3
LSR.W #2,D3
ADD.W D2,D3 * adds the type of register
JSR ea
* Print comma
LEA msgcomma,A1
MOVE.B #14,D0
TRAP #15
CLR.L D3
CLR.L D5
MOVE.W #%0000000000111111,D5
AND.W D6,D5
MOVE.W D5,D3
JSR ea
RTS
*------ADDA-------
adda:
LEA msgadda,A1
MOVE.B #14,D0
TRAP #15
CLR.L D3
JSR addasize
CLR.L D5
MOVE.W #%0000000000111111,D5
AND.W D6,D5
ADD.W D5,D3
JSR ea
* Print comma
LEA msgcomma,A1
MOVE.B #14,D0
TRAP #15
CLR.L D3
CLR.L D5
MOVE.W #%0000111000000000,D3
AND.W D6,D3
LSR.W #7,D3
LSR.W #2,D3
ADD.L #%0000000000001000,D3 * adds the type of register
JSR ea
RTS
addac:
*------ADDQ-------
addq:
CLR.L D5
MOVE.W #%1111000100000000,D5
AND.W D6,D5
CMP.W #%0101000000000000,D5
BNE sub
LEA msgaddq,A1
MOVE.B #14,D0
TRAP #15
JSR addqsize
LEA msgim,A1
MOVE.B #14,D0
TRAP #15
CLR.L D1
MOVE.W #%0000111000000000,D1
AND.W D6,D1
LSR.W #7,D1
LSR.W #2,D1
MOVE.B #3,D0
TRAP #15
* Print comma
LEA msgcomma,A1
MOVE.B #14,D0
TRAP #15
CLR.L D3
CLR.L D5
MOVE.W #%0000000000111111,D5
AND.W D6,D5
MOVE.W D5,D3
JSR ea
RTS
*--- Sizes ---
movesize:
MOVE.W #%0011000000000000,D5
AND.W D6,D5
CMP.W #%0001000000000000,D5
BEQ printbyte
CMP.W #%0011000000000000,D5
BEQ printword
BRA printlong
movemsize:
MOVE.W #%0000000001000000,D5
AND.W D6,D5
CMP.W #%0000000001000000,D5
BEQ printword
BRA printlong
addsize:
MOVE.W #%0000000111000000,D5
AND.W D6,D5
CMP.W #%0000000000000000,D5
BEQ printbyte
CMP.W #%0000000100000000,D5
BEQ printbyte
CMP.W #%0000000001000000,D5
BEQ printword
CMP.W #%0000000101000000,D5
BEQ printword
BRA printlong
addasize:
MOVE.W #%0000000111000000,D5
AND.W D6,D5
CMP.W #%0000000011000000,D5
BEQ printword
BRA printlong
addqsize:
MOVE.W #%0000000011000000,D5
AND.W D6,D5
CMP.W #%0000000000000000,D5
BEQ printbyte
CMP.W #%0000000001000000,D5
BEQ printword
BRA printlong
*----------------END Liam-----------------------
*------SUB-------
* format:
* |1001| register | opmode | <ea> mode | <ea> register
SUB:
CLR.L D5
MOVE.W #%1111000000000000, D5
AND.W D6, D5
CMP.W #%1001000000000000, D5
BNE lea
CLR.L D5
MOVE.W #%0000000111000000,D5
AND.W D6,D5
CMP.W #%0000000011000000,D5
BEQ invalid
MOVE.W #%0000000111000000,D5
AND.W D6,D5
CMP.W #%0000000111000000,D5
BEQ invalid
* display opcode SUB
LEA msgsub, A1
MOVE.B #14, D0
TRAP #15
JSR subsize
LEA msgspace, A1
MOVE.B #14, D0
TRAP #15
JSR subchoice
RTS
subchoice:
CLR.L D5
MOVE.W #%0000000111000000, D5
AND.W D6,D5
CMP.W #%0000000100000000, D5
BGE subc2
CLR.L D3
CLR.L D5
MOVE.W #%0000000000111111,D5
AND.W D6,D5
MOVE.W D5,D3
JSR ea
* Print comma
LEA msgcomma,A1
MOVE.B #14,D0
TRAP #15
CLR.L D3
CLR.L D5
MOVE.W #%0000111000000000,D3
AND.W D6,D3
LSR.W #7,D3
LSR.W #2,D3
JSR ea
RTS
subc2:
CLR.L D3
CLR.L D5
MOVE.W #%0000111000000000,D3
AND.W D6,D3
LSR.W #7,D3
LSR.W #2,D3
JSR ea
* Print comma
LEA msgcomma,A1
MOVE.B #14,D0
TRAP #15
CLR.L D3
CLR.L D5
MOVE.W #%0000000000111111,D5
AND.W D6,D5
MOVE.W D5,D3
JSR ea
RTS
* check size for SUB
subsize:
* check if byte
CLR.L D5
MOVE.W #%0000000111000000, D5
AND.W D6, D5
CMP.W #%0000000000000000, D5
BEQ printbyte *size: byte and operation: Dn – < ea > ? Dn
CMP.W #%0000000100000000, D5
BEQ printbyte *size: byte and operation: < ea > – Dn ? < ea >
* check if word
CMP.W #%0000000001000000, D5
BEQ printword *size: word and operation: Dn – < ea > ? Dn
CMP.W #%0000000101000000, D5
BEQ printword *size: word and operation: < ea > – Dn ? < ea >
* check if long