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Disassembler.X68
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782 lines (559 loc) · 14 KB
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*------------------------------------------------------------------------------
* Title : Disassembler
* Description: Handles the iteration through memory, the user input, the
* display of memory locations, and invalid opcodes.
*------------------------------------------------------------------------------
INCLUDE demo_test.X68
INCLUDE TestCode.X68
INCLUDE MOVEM.X68
INCLUDE LogicalShift.X68
INCLUDE Bcc_BRA.X68
INCLUDE MOVEQ.X68
INCLUDE MISC_CODE.X68
INCLUDE DIVU_OR.X68
INCLUDE MOVE_MOVEA.X68
INCLUDE ADD_ADDA.X68
INCLUDE SUB.X68
INCLUDE ADDQ.X68
INCLUDE MULS_AND.X68
START ORG $1000
LEA INTRO1,A1
MOVE.B #14,D0
TRAP #15
LEA INTRO2,A1
MOVE.B #14,D0
TRAP #15
LEA INTRO1,A1
MOVE.B #14,D0
TRAP #15
LEA INTRO3,A1
MOVE.B #14,D0
TRAP #15
LEA INTRO4,A1
MOVE.B #14,D0
TRAP #15
MOVE.L #0,D7
MOVE.L #0,D1
MOVE.L #0,D2
MOVE.L #0,A4
MOVE.L #9,A3
LEA RESET_TEXT,A1
MOVE.B #14,D0
TRAP #15
LEA EXIT_TEXT,A1
MOVE.B #14,D0
TRAP #15
LEA INPUT1_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BRA GET_INPUT1
MOVE.L #$60B0,A3
BRA COMPARE
GET_INPUT1
ADDQ.L #1,A4
CMP.L A4,A3
BEQ LOAD_INPUT1
MOVE.B #5,D0
TRAP #15
BSR GET_NUMBER
BRA GET_INPUT1
LOAD_INPUT1
MOVE.L D2,A2
MOVE.L #$0,A4
LEA INPUT2_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BRA GET_INPUT2
GET_INPUT2
ADDQ.L #1,A4
CMP.L A4,A3
BEQ LOAD_INPUT2
MOVE.B #5,D0
TRAP #15
BSR GET_NUMBER
BRA GET_INPUT2
LOAD_INPUT2
MOVE.L D2,A3
MOVE.L #$0000FF00,D1
MOVE.B #11,D0
TRAP #15
LEA NEWLINE,A1
MOVE.B #14,D0
TRAP #15
BRA PARSE_SIMPLE
;Parses Simple Commands, such as NOP
PARSE_SIMPLE
BSR LOAD_0s_FOR_MEM_LOCATION
MOVE.B #16,D2
MOVE.B #15,D0
MOVE.L A2,D1
TRAP #15
MOVE.B #HT,D1
MOVE.B #6,D0
TRAP #15
MOVE.W (A2),A4
CMP.W #NOP_CODE,A4
BEQ IF_NOP
CMP.W #RTS_CODE,A4
BEQ IF_RTS
BRA PARSE_COMPLEX
; For parsing more complex commands
PARSE_COMPLEX
MOVE.W A4,A5
MOVE.W A4,D3
AND.W #$F000,D3
CMP.W #MOVE_B_CODE,D3
BEQ IF_MOVE_B
CMP.W #MOVE_W_CODE,D3
BEQ IF_MOVE_W
CMP.W #MOVE_L_CODE,D3
BEQ IF_MOVE_L
CMP.W #ADD_CODE,D3
BEQ IF_ADD_ADDA
CMP.W #SUB_CODE,D3
BEQ IF_SUB
CMP.W #ADDQ_CODE,D3
BEQ IF_ADDQ
CMP.W #MULS_AND_CODE,D3
BEQ IF_MULS_AND
CMP.W #DIVU_OR_CODE,D3
BEQ IF_DIVU_OR
CMP.W #MISC_CODE,D3
BEQ IF_MISC
CMP.W #MOVEQ_CODE,D3
BEQ IF_MOVEQ
CMP.W #Bcc_BRA_CODE,D3
BEQ IF_Bcc_BRA
CMP.W #LS_CODE,D3
BEQ IF_LS_CODE
BRA IF_INVALID_OP
IF_NOP
LEA NOP_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BRA ITERATE
IF_RTS
LEA RTS_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BRA ITERATE
IF_MOVE_B
MOVE.W #MOVE_B_CODE,D5
BRA PARSE_MOVE
IF_MOVE_W
MOVE.W #MOVE_W_CODE,D5
BRA PARSE_MOVE
IF_MOVE_L
MOVE.W #MOVE_L_CODE,D5
BRA PARSE_MOVE
IF_INVALID_OP
LEA ERROR_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BSR LOAD_0s_FOR_DATA
MOVE.B #16,D2
MOVE.B #15,D0
MOVE.W (A2),D1
TRAP #15
BRA ITERATE
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
IF_INVALID_OP_EA
LEA ERROR_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BSR LOAD_0s_FOR_DATA
MOVE.B #16,D2
MOVE.B #15,D0
MOVE.W (A2),D1
TRAP #15
LEA BAD_EA,A1
MOVE.B #14,D0
TRAP #15
BRA ITERATE
IF_INVALID_OPMODE
MOVE.B #SPACE,D1
MOVE.B #6,D0
TRAP #15
LEA ERROR_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BSR LOAD_0s_FOR_DATA
MOVE.B #16,D2
MOVE.B #15,D0
MOVE.W (A2),D1
TRAP #15
LEA BAD_OPMODE,A1
MOVE.B #14,D0
TRAP #15
BRA ITERATE
IF_INVALID_SIZE
MOVE.B #SPACE,D1
MOVE.B #6,D0
TRAP #15
LEA ERROR_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BSR LOAD_0s_FOR_DATA
MOVE.B #16,D2
MOVE.B #15,D0
MOVE.W (A2),D1
TRAP #15
LEA BAD_SIZE,A1
MOVE.B #14,D0
TRAP #15
BRA ITERATE
IF_INVALID_SRC_DEST
MOVE.B #SPACE,D1
MOVE.B #6,D0
TRAP #15
LEA ERROR_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BSR LOAD_0s_FOR_DATA
MOVE.B #16,D2
MOVE.B #15,D0
MOVE.W (A2),D1
TRAP #15
LEA BAD_SRC_DEST,A1
MOVE.B #14,D0
TRAP #15
BRA ITERATE
IF_INVALID_MASK
MOVE.B #SPACE,D1
MOVE.B #6,D0
TRAP #15
LEA ERROR_OUTPUT,A1
MOVE.B #14,D0
TRAP #15
BSR LOAD_0s_FOR_DATA
MOVE.B #16,D2
MOVE.B #15,D0
MOVE.W (A2),D1
TRAP #15
LEA BAD_MASK,A1
MOVE.B #14,D0
TRAP #15
BRA ITERATE
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ITERATE
ADDQ.L #2,A2
ADDQ.L #1,D7
LEA NEWLINE,A1
MOVE.B #14,D0
TRAP #15
BSR SHOULD_PAUSE_PARSER
BRA COMPARE
COMPARE
CMP.L A2,A3
BLT SHOULD_RUN_AGAIN
BRA PARSE_SIMPLE
DONE
LEA DONE_TEXT,A1
MOVE.B #14,D0
TRAP #15
MOVE.B #9,D0
TRAP #15
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
GET_NUMBER
CMP.B #R_LOWER,D1
BEQ RESET
CMP.B #R_UPPER,D1
BEQ RESET
CMP.B #ESC,D1
BEQ DONE
IS_0
SUB.B #$30,D1
LSL.L #4,D2
CMP.B #$0,D1
BEQ ADD_NUM
IS_1
CMP.B #$1,D1
BEQ ADD_NUM
IS_2
CMP.B #$2,D1
BEQ ADD_NUM
IS_3
CMP.B #$3,D1
BEQ ADD_NUM
IS_4
CMP.B #$4,D1
BEQ ADD_NUM
IS_5
CMP.B #$5,D1
BEQ ADD_NUM
IS_6
CMP.B #$6,D1
BEQ ADD_NUM
IS_7
CMP.B #$7,D1
BEQ ADD_NUM
IS_8
CMP.B #$8,D1
BEQ ADD_NUM
IS_9
CMP.B #$9,D1
BEQ ADD_NUM
IS_A
SUB.B #$7,D1
CMP.B #$A,D1
BEQ ADD_NUM
IS_B
CMP.B #$B,D1
BEQ ADD_NUM
IS_C
CMP.B #$C,D1
BEQ ADD_NUM
IS_D
CMP.B #$D,D1
BEQ ADD_NUM
IS_E
CMP.B #$E,D1
BEQ ADD_NUM
IS_F
CMP.B #$F,D1
BEQ ADD_NUM
IS_A_LOWER
SUB.B #$19,D1
CMP.B #$9,D1
BEQ ADD_NUM
IS_B_LOWER
SUB.B #$7,D1
CMP.B #$A,D1
BEQ ADD_NUM
IS_C_LOWER
CMP.B #$B,D1
BEQ ADD_NUM
IS_D_LOWER
CMP.B #$C,D1
BEQ ADD_NUM
IS_E_LOWER
CMP.B #$D,D1
BEQ ADD_NUM
IS_F_LOWER
CMP.B #$E,D1
BEQ ADD_NUM
IS_INVALID
BRA START
* Add the number in
ADD_NUM
ADD.L D1,D2
RTS
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
SHOULD_PAUSE_PARSER
CMP.L #12,D7
BEQ PAUSE_PARSER
RTS
PAUSE_PARSER
LEA CONTINUTE_TEXT,A1
MOVE.B #14,D0
TRAP #15
LEA RESET_TEXT,A1
MOVE.B #14,D0
TRAP #15
LEA EXIT_TEXT,A1
MOVE.B #14,D0
TRAP #15
BRA SHOULD_CONTINUE
SHOULD_CONTINUE
MOVE.B #5,D0
TRAP #15
CMP.B #C_LOWER,D1
BEQ CONTINUE
CMP.B #C_UPPER,D1
BEQ CONTINUE
CMP.B #CR,D1
BEQ CONTINUE
CMP.B #LF,D1
BEQ CONTINUE
CMP.B #R_LOWER,D1
BEQ RESET
CMP.B #R_UPPER,D1
BEQ RESET
CMP.B #ESC,D1
BEQ DONE
BRA SHOULD_CONTINUE
CONTINUE
MOVE.W #$FF00,D1
MOVE.B #11,D0
TRAP #15
LEA NEWLINE,A1
MOVE.B #14,D0
TRAP #15
MOVE.L #0,D7
RTS
RESET
MOVE.L #$0000FF00,D1
MOVE.B #11,D0
TRAP #15
BRA START
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
SHOULD_RUN_AGAIN
LEA NEWLINE,A1
MOVE.B #14,D0
TRAP #15
LEA RESET_TEXT,A1
MOVE.B #14,D0
TRAP #15
LEA EXIT_TEXT,A1
MOVE.B #14,D0
TRAP #15
BRA RUN_AGAIN_CHECK
RUN_AGAIN_CHECK
MOVE.B #5,D0
TRAP #15
CMP.B #R_LOWER,D1
BEQ RESET
CMP.B #R_UPPER,D1
BEQ RESET
CMP.B #ESC,D1
BEQ DONE
BRA RUN_AGAIN_CHECK
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
LOAD_0s_FOR_DATA
MOVE.W (A2),D5
AND.L #$0000FFFF,D5
MOVE.B #$30,D1
MOVE.B #6,D0
CMP.L #$0000000F,D5
BLE DISPLAY_ZERO_3
CMP.L #$000000FF,D5
BLE DISPLAY_ZERO_2
CMP.L #$00000FFF,D5
BLE DISPLAY_ZERO_1
BRA DISPLAY_NO_ZERO
LOAD_0s_FOR_MEM_LOCATION
MOVE.B #$30,D1
MOVE.B #6,D0
CMP.L #$0000000F,A2
BLE DISPLAY_ZERO_7
CMP.L #$000000FF,A2
BLE DISPLAY_ZERO_6
CMP.L #$00000FFF,A2
BLE DISPLAY_ZERO_5
CMP.L #$0000FFFF,A2
BLE DISPLAY_ZERO_4
CMP.L #$000FFFFF,A2
BLE DISPLAY_ZERO_3
CMP.L #$00FFFFFF,A2
BLE DISPLAY_ZERO_2
CMP.L #$0FFFFFFF,A2
BLE DISPLAY_ZERO_1
BRA DISPLAY_NO_ZERO
DISPLAY_ZERO_7
TRAP #15
DISPLAY_ZERO_6
TRAP #15
DISPLAY_ZERO_5
TRAP #15
DISPLAY_ZERO_4
TRAP #15
DISPLAY_ZERO_3
TRAP #15
DISPLAY_ZERO_2
TRAP #15
DISPLAY_ZERO_1
TRAP #15
DISPLAY_NO_ZERO
RTS
* Put variables and constants here
CR EQU $0D
LF EQU $0A
LEFT_PAR EQU $28
RIGHT_PAR EQU $29
A EQU $41
D EQU $44
PLUS EQU $2B
MINUS EQU $2D
NUM EQU $23
HEX EQU $24
COMMA EQU $2C
SPACE EQU $20
SLASH EQU $2F
HT EQU $09
ESC EQU $1B
C_LOWER EQU $63
C_UPPER EQU $43
R_LOWER EQU $72
R_UPPER EQU $52
ZERO EQU $30
;Codes to be parsed
NOP_CODE EQU $4E71
RTS_CODE EQU $4E75
MOVE_B_CODE EQU $1000 ; MOVE.B, MOVEA.B (done)
MOVE_W_CODE EQU $3000 ; MOVE.W, MOVEA.W (done)
MOVE_L_CODE EQU $2000 ; MOVE.L, MOVEA.L (done)
MOVEQ_CODE EQU $7000 ; MOVEQ (done)
DIVU_OR_CODE EQU $8000 ; [DIVU], OR (done)
SUB_CODE EQU $9000 ; SUB (done)
MULS_AND_CODE EQU $C000 ; [MULS], AND (done)
ADD_CODE EQU $D000 ; ADD, ADDA (done)
LS_CODE EQU $E000 ; LOGICAL SHIFTS (done)
ADDQ_CODE EQU $5000 ; ADDQ (done)
Bcc_BRA_CODE EQU $6000 ; Bcc (BGT, BLE, BEQ), BRA
MISC_CODE EQU $4000 ; LEA, NOT, JSR, MOVEM (done)
LSR_ADDRESS EQU $E2C0
LSL_ADDRESS EQU $E3C0
ASR_ADDRESS EQU $E0C0
ASL_ADDRESS EQU $E1C0
ROR_ADDRESS EQU $E6C0
ROL_ADDRESS EQU $E7C0
LSR_REGISTER EQU $E008
LSL_REGISTER EQU $E108
ASR_REGISTER EQU $E000
ASL_REGISTER EQU $E100
ROR_REGISTER EQU $E018
ROL_REGISTER EQU $E118
;Sample outputs
NOP_OUTPUT DC.B 'NOP',0
RTS_OUTPUT DC.B 'RTS',0
MOVEA_OUTPUT DC.B 'MOVEA',0
MOVE_OUTPUT DC.B 'MOVE',0
ADDA_OUTPUT DC.B 'ADDA',0
ADD_OUTPUT DC.B 'ADD',0
SUB_OUTPUT DC.B 'SUB',0
ADDQ_OUTPUT DC.B 'ADDQ',0
AND_OUTPUT DC.B 'AND',0
MULS_OUTPUT DC.B 'MULS',0
OR_OUTPUT DC.B 'OR',0
DIVU_OUTPUT DC.B 'DIVU',0
NOT_OUTPUT DC.B 'NOT',0
JSR_OUTPUT DC.B 'JSR ',0
LEA_OUTPUT DC.B 'LEA ',0
MOVEQ_OUTPUT DC.B 'MOVEQ ',0
MOVEM_OUTPUT DC.B 'MOVEM',0
BRA_OUTPUT DC.B 'BRA',0
BGT_OUTPUT DC.B 'BGE',0
BLE_OUTPUT DC.B 'BLE',0
BEQ_OUTPUT DC.B 'BEQ',0
LSR_OUTPUT DC.B 'LSR',0
LSL_OUTPUT DC.B 'LSL',0
ASR_OUTPUT DC.B 'ASR',0
ASL_OUTPUT DC.B 'ASL',0
ROR_OUTPUT DC.B 'ROR',0
ROL_OUTPUT DC.B 'ROL',0
B_OUTPUT DC.B '.B ',0
W_OUTPUT DC.B '.W ',0
L_OUTPUT DC.B '.L ',0
INPUT1_OUTPUT DC.B CR,LF,'Please enter the starting address: ',0
INPUT2_OUTPUT DC.B CR,LF,'Please enter the end address: ',0
CONTINUTE_TEXT DC.B CR,LF,'Press [c] or [enter] to continue disassembler',CR,LF,0
RESET_TEXT DC.B 'Press [r] to reset disassembler',CR,LF,0
EXIT_TEXT DC.B 'Press [esc] to end disassembler',CR,LF,0
DONE_TEXT DC.B CR,LF,'[Disassembler exited]',CR,LF,0
BAD_SIZE DC.B CR,LF,HT,HT,' *Invalid size argument*',0
BAD_EA DC.B CR,LF,HT,HT,' *Invalid effective address argument*',0
BAD_OPMODE DC.B CR,LF,HT,HT,' *Invalid opmode argument*',0
BAD_SRC_DEST DC.B CR,LF,HT,HT,' *Invalid source/destination argument*',0
BAD_MASK DC.B CR,LF,HT,HT,' *Invalid mask*',0
INTRO1 DC.B '**************************************************',CR,LF,0
INTRO2 DC.B '---------- The A-Team 68k Disassembler -----------',CR,LF,0
INTRO3 DC.B CR,LF,'[Please note that backspace is not implemented]',CR,LF,0
INTRO4 DC.B '[To undo your input, please reset the Disassembler]',CR,LF,CR,LF,0
INVALID_OUTPUT DC.B 'Invalid operation!',0
ERROR_OUTPUT DC.B 'DATA ',0
NEWLINE DC.B CR,LF,0
END START ; last line of source
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