crash

.global crash

crash:

PUSH {R12}
LDR R12, =ZSpare
LDR R11, [R12, #150]
POP {R12}

LDR R10, =#0xE0001030
MOV R9, #48
STR R9, [R10]
MOV R9, #120
STR R9, [R10]
LSR R9, R8, #4
AND R9, #0b00001111
CMP R9, #10
BLGE letter
BLLT num
B crash2

crash2:
LSR R9, R8, #0
AND R9, #0b00001111
CMP R9, #10
BLGE letter
BLLT num
B crash3



crash3:


;@ Print the invalid intruction and its location in HEX
;@ Should probably loop back to execute or something


MOV R9, #32
    STR R9, [R10]
    MOV R9, #64
    STR R9, [R10]
    MOV R9, #32
    STR R9, [R10]
MOV R9, #48
STR R9, [R10]
MOV R9, #120
STR R9, [R10]
;@LDR R11, =#0xffffffff;@overide ZPC value for testing
LSR R9, R11, #28
CMP R9, #10
BLGE letter
BLLT num
B crash4

crash4:
LSR R9, R11, #24
AND R9, #0b00001111
CMP R9, #10
BLGE letter
BLLT num
B crash5

crash5:
LSR R9, R11, #20
AND R9, #0b00001111
CMP R9, #10
BLGE letter
BLLT num
B crash6

crash6:
LSR R9, R11, #16
AND R9, #0b00001111
CMP R9, #10
BLGE letter
BLLT num
B crash7

crash7:
    LSR R9, R11, #12
    AND R9, #0b00001111
    CMP R9, #10
    BLGE letter
    BLLT num
    B crash8

crash8:
    LSR R9, R11, #8
    AND R9, #0b00001111
    CMP R9, #10
    BLGE letter
    BLLT num
    B crash9

crash9:
    LSR R9, R11, #4
    AND R9, #0b00001111
    CMP R9, #10
    BLGE letter
    BLLT num
    B crash10

crash10:
    LSR R9, R11, #0
    AND R9, #0b00001111
    CMP R9, #10
    BLGE letter
    BLLT num

	LDR R9, = ZSpare
	LDR R9, [R9, #100]



	LDR R10, =#0xE0001030
	MOV R11, #10
	STR R11, [R10]
	MOV R11, #79
	STR R11, [R10]
	MOV R11, #80
	STR R11, [R10]
	MOV R11, #69
	STR R11, [R10]
	MOV R11, #82
	STR R11, [R10]
	MOV R11, #65
	STR R11, [R10]
	MOV R11, #78
	STR R11, [R10]
	MOV R11, #68
	STR R11, [R10]
	MOV R11, #83
	STR R11, [R10]
	MOV R11, #58
	STR R11, [R10]
	SUBS R9, #1
	BMI done
	MOV R8, R0
	MOV R7, #12

	BL printOpcode
	SUBS R9, #1
	BMI done
	MOV R8, R1
	MOV R7, #12
	BL printOpcode
	SUBS R9, #1
	BMI done
	MOV R8, R2
	MOV R7, #12
	BL printOpcode
	SUBS R9, #1
	BMI done
	MOV R8, R3
	MOV R7, #12
	BL printOpcode
	SUBS R9, #1
	BMI done


printOpcode:
	PUSH {R14}
	MOV R11, #10
	STR R11, [R10]
	MOV R11, #13
	STR R11, [R10]
	MOV R11, #48
	STR R11, [R10]
	MOV R11, #120
	STR R11, [R10]
printOpcode1:
	LSR R11, R8, R7
	AND R11, #0b00001111
	CMP R11, #10
	BLGE letter_op
	BLLT num_op
	SUBS R7, #4
	POPMI {R15}
	B printOpcode1






B done



letter_op:
PUSH {R14}
ADD R11, #87
STR R11, [R10]
POP {R15}

num_op:
PUSH {R14}
ADD R11, #48
STR R11, [R10]
POP {R15}




letter:
PUSH {R14}
ADD R9, #87
STR R9, [R10]
POP {R15}

num:
PUSH {R14}
ADD R9, #48
STR R9, [R10]
POP {R15}













done:
b done