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874 lines (759 loc) · 16.2 KB
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OP Subroutine.X68
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874 lines (759 loc) · 16.2 KB
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*-----------------------------------------------------------
* Title :
* Written by :
* Date :
* Description:
*-----------------------------------------------------------
CR EQU $0D
LF EQU $0A
START_ADDR EQU $01A
ORG $1000
START: ; first instruction of program
*-------Code for Output------
LEA INPUT_MSG, A1
MOVE.B #14,D0
TRAP #15 *Displays message
*-------Code for Intput------
MOVEA.L INPUT,A1
MOVE.B #2,D0
TRAP #15
MOVEA.L #START_ADDR,A2
MOVE.B D1,D2
*Convert user input from str to hex
LOOP_CONV
CMP.B #0,D2
BEQ CONV_DONE
MOVE.B (A1)+,D3 *Move curr byte (8 bits) to D3
SUB.B #1,D2 *decrement counter
CMP.B #$39,D3
BLE CONV_NUM
CMP.B #$41,D3
BGE CONV_LETTER
CONV_LETTER
SUB.B #$37,D3
MOVE.B D3,(A2)+ *Store converted bits in A2
BRA LOOP_CONV
CONV_NUM
SUB.B #$30,D3
MOVE.B D3,(A2)+
BRA LOOP_CONV
CONV_DONE
MOVEA.L #START_ADDR,A2
CLR.B D2
MOVE.B #4,D2
CONCAT_BITS
CMP.B #0,D2
BEQ START_OP
*Concatenate bits
MOVE.B (A2)+,D4
LSL.L #4,D4 *(Source 1) Shift 4 bits
ADD.B (A2)+,D4 *(Source 1) Add next hex digit
LSL.L #8,D3 *clear 8 bits
ADD.B D4,D3 *concat
SUB.B #1,D2 *decrement counter
BRA CONCAT_BITS
* OP CODE SUBROUTINE
START_OP
NOP
MOVE.W #$4E71,D4
CMP.W D4,D3
BNE RTS
*Print instruction to output
LEA PRNT_NOP,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
*RTS *Return to I/O subroutine to find next instruction
RTS
MOVE.W #$4E75,D4
CMP.W D4,D3
BNE FIND_OP
*Print instruction
LEA PRNT_RTS,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
*RTS
FIND_OP *determine op code based on first 2 bits
MOVE.B #14,D6
MOVE.W D3,D4
LSR.W D6,D4
CMP.B #%00,D4 *MOVE,MOVEA
BEQ OP_00
CMP.B #%01,D4 *MOVEQ, MOVEM, ADDQ, LEA, NOT, BGT/BLE/BEQ, JSR, BRA
BEQ OP_01
CMP.B #%10,D4 *OR,SUB
BEQ OP_10
CMP.B #%11,D4 *ADD,AND,LSL,LSR,ROL,ROR,ASL,ASR
BEQ OP_11
OP_00 *Determine if MOVE or MOVEA op code
*Isolate bits 6,7,8
MOVE.W D3,D4
LSL.W #7,D4 *Remove first 7 bits
MOVE.B #13,D6
LSR.W D6,D4 *Remove last 6 bits
CMP.W #%001,D4
BEQ IS_MOVEA
IS_MOVE
*Print MOVE
LEA PRNT_MOVE,A1
MOVE.B #14,D0
TRAP #15
BRA MOVE_SIZE
IS_MOVEA
*Print MOVEA
LEA PRNT_MOVEA,A1
MOVE.B #14,D0
TRAP #15
MOVE_SIZE
MOVE.W D3,D4
MOVE.B #14,D6
LSL.W #2,D4 *Remove first 2 bits
LSR.W D6,D4 *Remove last 12 bits to find size code
CMP.B #%01,D4
BEQ MOVE_B
CMP.B #%11,D4
BEQ MOVE_W
CMP.B #%10,D4
BEQ MOVE_L
BRA INVALID_OP
MOVE_B
*Print .B (byte)
JSR PRINT_B
*Proceed to EA Subroutine
MOVE_W
*Print .W (word)
JSR PRINT_W
*Proceed to EA Subroutine
MOVE_L
*Print .L (long)
JSR PRINT_L
*Proceed to EA Subroutine
OP_01 *MOVEQ, MOVEM, ADDQ, LEA, NOT, BGT/BLE/BEQ, JSR, BRA
MOVE.W D3,D4
MOVE.B #12,D6
LSR.W D6,D4 *get first 4 bits
CMP.B #%0111,D4 *MOVEQ
BEQ OP_0111
CMP.B #%0100,D4 *MOVEM, LEA, NOT, JSR
BEQ OP_0100
CMP.B #%0101,D4 *ADDQ
BEQ OP_0101
CMP.B #%0110,D4 *Bcc, BRA
BEQ OP_0110
OP_0111 *MOVEQ
*Check bit 8 to validate
MOVE.L D3,D4
LSL.W #7,D4
MOVE.B #15,D6
LSR.W D6,D4
CMP.B #%0,D4
BNE INVALID_OP
*Print MOVEQ
LEA PRNT_MOVEQ,A1
MOVE.B #14,D0
TRAP #15
MOVE.L D3,D4
LSL.W #8,D4
LSR.W #8,D4
*Print data
MOVE.L D4,D1
MOVE.B #3,D0
TRAP #15
SIMHALT
*Proceed to EA Subroutine
OP_0100 *MOVEM, LEA, NOT, JSR
MOVE.L D3,D4
MOVE.B #11,D6
LSR.W D6,D4
CMP.B #%01001,D4 *MOVEM or JSR
BEQ OP_01001
*Check if LEA
MOVE.L D3,D4
LSL.W #7,D4
MOVE.B #13,D6
LSR.W D6,D4
CMP.B #%111,D4 *Check bits 8,7,6
BNE IS_NOT
LEA PRNT_LEA,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
*Proceed to EA Subroutine
IS_NOT
MOVE.L D3,D4
LSR.W #8,D4
CMP.W #%01000110,D4
BNE INVALID_OP
LEA PRNT_NOT,A1
MOVE.B #14,D0
TRAP #15
MOVE.L D3,D4
LSL.W #8,D4
MOVE.B #14,D6
LSR.W D6,D4
CMP.B #%00,D4
BEQ NOT_B
CMP.B #%01,D4
BEQ NOT_W
CMP.B #%10,D4
BEQ NOT_L
BRA INVALID_OP
NOT_B
JSR PRINT_B
*Proceed to EA Subroutine
NOT_W
JSR PRINT_W
*Proceed to EA Subroutine
NOT_L
JSR PRINT_L
*Proceed to EA Subroutine
OP_01001
MOVE.L D3,D4
LSR.W #6,D4
CMP.W #%0100111010,D4 *Check if JSR
BNE IS_MOVEM
LEA PRNT_JSR,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
*Proceed to EA Subroutine
IS_MOVEM
*Check bits 9,8,7 to validate
MOVE.L D3,D4
LSL.W #6,D4
MOVE.B #13,D6
LSR.W D6,D4
CMP.B #%001,D4
BNE INVALID_OP
LEA PRNT_MOVEM,A1
MOVE.B #14,D0
TRAP #15
MOVE.L D3,D4
MOVE.B #9,D6
LSL.W D6,D4
MOVE.B #15,D6
LSR.W D6,D4
CMP.B #0,D4
BEQ MOVEM_W
CMP.B #1,D4
BEQ MOVEM_L
BRA INVALID_OP
MOVEM_W
JSR PRINT_W
*Proceed to EA Subroutine
MOVEM_L
JSR PRINT_L
*Proceed to EA Subroutine
OP_0101 *ADDQ
*Check bit 8 to validate
MOVE.L D3,D4
LSL.W #7,D4
MOVE.B #15,D6
LSR.W D6,D4
CMP.B #%0,D4
BNE INVALID_OP
*Print ADDQ
LEA PRNT_ADDQ,A1
MOVE.B #14,D0
TRAP #15
MOVE.L D3,D4
LSL.W #8,D4 *Remove first 8 bits
MOVE.B #14,D6
LSR.W D6,D4 *and last 6 bits to get size
CMP.B #%00,D4
BEQ ADDQ_B
CMP.B #%01,D4
BEQ ADDQ_W
CMP.B #%10,D4
BEQ ADDQ_L
ADDQ_B
*Print .B
JSR PRINT_B
BRA ADDQ_DATA
ADDQ_W
*Print .W
JSR PRINT_W
BRA ADDQ_DATA
ADDQ_L
*Print .L
JSR PRINT_L
BRA ADDQ_DATA
ADDQ_DATA
MOVE.L D3,D4
LSL.W #4,D4 *Remove first 4 bits
MOVE.B #13,D6
LSR.W D6,D4
*Print data
MOVE.W D4,D1
MOVE.B #3,D0
TRAP #15
SIMHALT
*Proceed to EA Subroutine
OP_0110
MOVE.L D3,D4
MOVE.B #12,D6
LSL.W #4,D4
LSR.W D6,D4
CMP.W #%0000,D4
BEQ IS_BRA
CMP.W #%1110,D4
BEQ IS_BGT
CMP.W #%1111,D4
BEQ IS_BLE
CMP.W #%0111,D4
BEQ IS_BEQ
BRA INVALID_OP
IS_BRA
LEA PRNT_BRA,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
IS_BGT
LEA PRNT_BGT,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
IS_BLE
LEA PRNT_BLE,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
IS_BEQ
LEA PRNT_BEQ,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
DISP *8 bit displacement field
MOVE.L D3,D4
LSL.W #8,D4
LSR.W #8,D4 *Holds displacement value
AND.W #$00FF,D4
CMP.W #$00,D4
BEQ DISP_16
CMP.W #$FF,D4
BEQ DISP_32
MOVEA.W A0,A5
MOVE.W A5,D6 *Holds next instruction address
NOT.B D4
ADD.B #%01,D4
SUB.W D4,D6
MOVE.W D6,D1
MOVE.B #3,D0
TRAP #15
SIMHALT
DISP_16
MOVE.W (A0)+,D4
MOVEA.L A0,A5
MOVE.W A5,D6 *Holds next instruction address
NOT.B D4
ADD.B #%01,D4
SUB.W D4,D6
MOVE.W D6,D1
MOVE.B #3,D0
TRAP #15
SIMHALT
DISP_32
MOVE.L (A0)+,D4
MOVEA.L A0,A5
MOVE.W A5,D6 *Holds next instruction address
NOT.B D4
ADD.B #%01,D4
SUB.W D4,D6
MOVE.W D6,D1
MOVE.B #3,D0
TRAP #15
SIMHALT
OP_10 *OR,SUB
MOVE.L D3,D4
LSL.W #2,D4
MOVE.B #14,D6
LSR.W D6,D4
CMP.B #%00,D4 *Check bits 13 and 12
BEQ IS_OR
CMP.B #%01,D4
BEQ IS_SUB
BRA INVALID_OP
IS_OR
LEA PRNT_OR,A1
MOVE.B #14,D0
TRAP #15
MOVE.L D3,D4
LSL.W #7,D4
MOVE.B #13,D6
LSR.W D6,D4
CMP.B #%000,D4
BEQ OR_B
CMP.B #%001,D4
BEQ OR_W
CMP.B #%010,D4
BEQ OR_L
CMP.B #%100,D4
BEQ OR_B
CMP.B #%101,D4
BEQ OR_W
CMP.B #%110,D4
BEQ OR_L
BRA INVALID_OP
OR_B
JSR PRINT_B
*Proceed to EA Subroutine
OR_W
JSR PRINT_W
*Proceed to EA Subroutine
OR_L
JSR PRINT_L
*Proceed to EA Subroutine
IS_SUB
LEA PRNT_SUB,A1
MOVE.B #14,D0
TRAP #15
MOVE.L D3,D4
LSL.W #7,D4
MOVE.B #13,D6
LSR.W D6,D4
CMP.B #%000,D4
BEQ SUB_B
CMP.B #%001,D4
BEQ SUB_W
CMP.B #%010,D4
BEQ SUB_L
CMP.B #%100,D4
BEQ SUB_B
CMP.B #%101,D4
BEQ SUB_W
CMP.B #%110,D4
BEQ SUB_L
SUB_B
JSR PRINT_B
*Proceed to EA Subroutine
SUB_W
JSR PRINT_W
*Proceed to EA Subroutine
SUB_L
JSR PRINT_L
*Proceed to EA Subroutine
OP_11
MOVE.L D3,D4
MOVE.B #12,D6
LSR.W D6,D4
CMP.B #%1100,D4 *AND
BEQ OP_1100
CMP.B #%1101,D4 *ADD,ADDA
BEQ OP_1101
CMP.B #%1110,D4 *LSL/LSR,ASL/ASR,ROL/ROR
BEQ OP_1110
BRA INVALID_OP
OP_1100 *AND
LEA PRNT_AND,A1
MOVE.B #14,D0
TRAP #15
MOVE.L D3,D4
LSL.W #7,D4
MOVE.B #13,D6
LSR.W D6,D4 *Get Opmode
*< ea > Dn -> Dn
CMP.B #%000,D4
BEQ AND_B
CMP.B #%001,D4
BEQ AND_W
CMP.B #%010,D4
BEQ AND_L
*Dn < ea > -> < ea >
CMP.B #%100,D4
BEQ AND_B
CMP.B #%101,D4
BEQ AND_W
CMP.B #%110,D4
BEQ AND_L
BRA INVALID_OP
AND_B
JSR PRINT_B
*Proceed to EA Subroutine
AND_W
JSR PRINT_W
*Proceed to EA Subroutine
AND_L
JSR PRINT_L
*Proceed to EA Subroutine
OP_1101 *ADD,ADDA
MOVE.L D3,D4
LSL.W #7,D4
MOVE.B #13,D6
LSR.W D6,D4 *Get Opmode
*ADD Opmodes
CMP.B #%000,D4
BEQ ADD_B
CMP.B #%001,D4
BEQ ADD_W
CMP.B #%010,D4
BEQ ADD_L
CMP.B #%100,D4
BEQ ADD_B
CMP.B #%101,D4
BEQ ADD_W
CMP.B #%110,D4
BEQ ADD_L
*ADDA Opmodes
CMP.B #%011,D4
BEQ ADDA_W
CMP.B #%111,D4
BEQ ADDA_L
BRA INVALID_OP
IS_ADD
LEA PRNT_ADD,A1
MOVE.B #14,D0
TRAP #15
RTS
IS_ADDA
LEA PRNT_ADDA,A1
MOVE.B #14,D0
TRAP #15
RTS
ADD_B
JSR IS_ADD
JSR PRINT_B
*Proceed to EA Subroutine
ADD_W
JSR IS_ADD
JSR PRINT_W
*Proceed to EA Subroutine
ADD_L
JSR IS_ADD
JSR PRINT_L
*Proceed to EA Subroutine
ADDA_W
JSR IS_ADDA
JSR PRINT_W
*Proceed to EA Subroutine
ADDA_L
JSR IS_ADDA
JSR PRINT_L
*Proceed to EA Subroutine
OP_1110 *LSL/LSR,ASL/ASR,ROL/ROR
*Memory Shift Check bits 6,7
MOVE.L D3,D4
LSL.W #8,D4
MOVE.L #14,D6
LSR.W D6,D4
CMP.B #%11,D4
BNE REG
*Memory Shift check bits 11,10,9
MOVE.L D3,D4
LSL.W #4,D4
MOVE.B #13,D6
LSR.W D6,D4
CMP.B #%000,D4 *ASL/ASR
BEQ A_MEM
CMP.B #%001,D4 *LSL,LSR
BEQ L_MEM
CMP.B #%011,D4 *ROL/ROR
BEQ R_MEM
*Register Shift check bits 4,3
REG MOVE.L D3,D4
MOVE.B #11,D6
LSL.W D6,D4
MOVE.B #17,D6
LSR.W D6,D4
CMP.B #%00,D4 *ASL/ASR
BEQ A_REG
CMP.B #%01,D4 *LSL/LSR
BEQ L_REG
CMP.B #%11,D4 *ROL/ROR
BEQ R_REG
BRA INVALID_OP
*Check bit 8 to determine L/R shift
A_REG
JSR RGHT_LFT
CLR.L D6
MOVE.B #01,D6
CMP.B #%0,D4
BEQ IS_ASR
CMP.B #%1,D4
BEQ IS_ASL
BRA INVALID_OP
A_SIZE
BRA GET_SHFT_SIZE
A_MEM
JSR RGHT_LFT
CLR.L D6
MOVE.B #02,D6
CMP.B #%0,D4
BEQ IS_ASR
CMP.B #%1,D4
BEQ IS_ASL
*Proceed to EA Subroutine
SIMHALT
IS_ASR
LEA PRNT_ASR,A1
MOVE.B #14,D0
TRAP #15
CMP.B #01,D6
BEQ A_SIZE
SIMHALT
IS_ASL
LEA PRNT_ASL,A1
MOVE.B #14,D0
TRAP #15
CMP.B #01,D6
BEQ A_SIZE
SIMHALT
L_REG
JSR RGHT_LFT
CLR.L D6
MOVE.B #01,D6
CMP.B #%0,D4
BEQ IS_LSR
CMP.B #%1,D4
BEQ IS_LSL
BRA INVALID_OP
L_SIZE
BRA GET_SHFT_SIZE
L_MEM
JSR RGHT_LFT
CLR.L D6
MOVE.B #02,D6
CMP.B #%0,D4
BEQ IS_LSR
CMP.B #%1,D4
BEQ IS_LSL
*Proceed to EA Subroutine
SIMHALT
IS_LSR
LEA PRNT_LSR,A1
MOVE.B #14,D0
TRAP #15
CMP.B #01,D6
BEQ L_SIZE
SIMHALT
IS_LSL
LEA PRNT_LSL,A1
MOVE.B #14,D0
TRAP #15
CMP.B #01,D6
BEQ L_SIZE
SIMHALT
R_REG
JSR RGHT_LFT
CLR.L D6
MOVE.B #01,D6
CMP.B #%0,D4
BEQ IS_ROR
CMP.B #%1,D4
BEQ IS_ROL
BRA INVALID_OP
R_SIZE
BRA GET_SHFT_SIZE
R_MEM
JSR RGHT_LFT
CLR.L D6
MOVE.B #02,D6
CMP.B #%0,D4
BEQ IS_ROR
CMP.B #%1,D4
BEQ IS_ROL
*Proceed to EA Subroutine
SIMHALT
IS_ROR
LEA PRNT_ROR,A1
MOVE.B #14,D0
TRAP #15
CMP.B #01,D6
BEQ R_SIZE
SIMHALT
IS_ROL
LEA PRNT_ROL,A1
MOVE.B #14,D0
TRAP #15
CMP.B #01,D6
BEQ R_SIZE
SIMHALT
GET_IR
MOVE.L D3,D4
MOVE.B #10,D6
LSL.W D6,D4
MOVE.B #15,D6
LSR.W D6,D4
MOVE.W D4,D1
MOVE.B #3,D0
TRAP #15
SIMHALT
RGHT_LFT *0 = RIGHT 1 = LEFT
*Determine if right/left shift
MOVE.L D3,D4
MOVE.B #15,D6
LSL.W #7,D4
LSR.W D6,D4
RTS
GET_SHFT_SIZE
MOVE.L D3,D4
LSL.W #8,D4
MOVE.B #14,D6
LSR.W D6,D4
CMP.B #%00,D4 *B
BEQ PRINT_B
CMP.B #%01,D4 *W
BEQ PRINT_W
CMP.B #%10,D4 *L
BEQ PRINT_L
*Proceed to EA Subroutine
PRINT_B
LEA PRNT_B,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
PRINT_W
LEA PRNT_W,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
PRINT_L
LEA PRNT_L,A1
MOVE.B #14,D0
TRAP #15
SIMHALT
INVALID_OP
LEA INVALID_MSG,A1
MOVE.B #14,D0
TRAP #15
SIMHALT ; halt simulator
* Put variables and constants here
INPUT_MSG DC.B 'Enter machine code: ',0
INPUT DS.L 1
INVALID_MSG DC.B 'Invalid Instruction',CR,LF,0
PRNT_B DC.B '.B ',0
PRNT_W DC.B '.W ',0
PRNT_L DC.B '.L ',0
PRNT_NOP DC.B 'NOP',0
PRNT_RTS DC.B 'RTS',0
PRNT_MOVE DC.B 'MOVE',0
PRNT_MOVEA DC.B 'MOVEA',0
PRNT_MOVEM DC.B 'MOVEM',0
PRNT_MOVEQ DC.B 'MOVEQ',0
PRNT_JSR DC.B 'JSR',0
PRNT_BGT DC.B 'BGT',0
PRNT_BLE DC.B 'BLE',0
PRNT_BEQ DC.B 'BEQ',0
PRNT_BRA DC.B 'BRA',0
PRNT_NOT DC.B 'NOT',0
PRNT_OR DC.B 'OR',0
PRNT_LEA DC.B 'LEA',0
PRNT_ADDQ DC.B 'ADDQ',0
PRNT_ADD DC.B 'ADD',0
PRNT_ADDA DC.B 'ADDA',0
PRNT_AND DC.B 'AND',0
PRNT_SUB DC.B 'SUB',0
PRNT_ASL DC.B 'ASL',0
PRNT_ASR DC.B 'ASR',0
PRNT_LSL DC.B 'LSL',0
PRNT_LSR DC.B 'LSR',0
PRNT_ROL DC.B 'ROL',0
PRNT_ROR DC.B 'ROR',0
*D3 = original instruction
*D4 = copy of instruction
*D6 = num of bits to shift
END START ; last line of source
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