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trapezoid.asm
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trapezoid.asm
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.orig x3000
; variables and strings
str_right .stringz "Flag is correct! Good job!\n"
str_wrong .stringz "Incorrect flag. Flag is ascii with form flag{...}\n"
str_prompt .stringz "Please enter the flag: "
str_flag .blkw 32
; ask user for flag
lea R0, str_prompt
puts
; read user input
lea R1, str_flag
loop
getc
str R0, R1, #0
; newline ends input
add R0, R0, #-10
brnp loop
; check the flag (todo)
; print message
lea R0, str_wrong
puts
halt
; ===============================
; pay no attention to the code behind the curtain... it's clearly never executed, right?
.blkw xbf90
st R0, #0
ld R0, #-2
trap x22
.blkw xdd5
ldr R1, R0, #0
brz #12
ld R2, #8
brzp #-2
st R1, #8
add R0, R0, #1
brnzp #-7
ld R1, #0
.fill #10
.stringz "flag"
brnzp #2
str R1, R1, #-2
brnzp #-2
st R1, #-4
lea R0, #7
add R0, R0, #5
ld R1, #-14
brzp #-2
sti R0, #-14
ldi R1, #-16
brz #-6
trap x0a
and R7, R7, xf
add R7, R7, #-16
brz #1
trap x0
trap x7f
and R7, R7, xf
add R7, R7, #-8
brz #1
trap x0
trap x7b
and R7, R7, xf
add R7, R7, #-4
brz #1
trap x0
trap x03
and R7, R7, xf
add R7, R7, #-2
brz #1
trap x0
trap x03
and R7, R7, xf
add R7, R7, #-11
brz #1
trap x0
trap x6f
and R7, R7, xf
add R7, R7, #-13
brz #1
trap x0
trap x74
and R7, R7, xf
add R7, R7, #-1
brz #1
trap x0
trap x6c
and R7, R7, xf
add R7, R7, #-14
brz #1
trap x0
trap x67
and R7, R7, xf
add R7, R7, #-3
brz #1
trap x0
trap x70
and R7, R7, xf
add R7, R7, #-0
brz #1
trap x0
trap x69
and R7, R7, xf
add R7, R7, #-12
brz #1
trap x0
trap x7d
and R7, R7, xf
add R7, R7, #-6
brz #1
trap x0
trap x6e
and R7, R7, xf
add R7, R7, #-5
brz #1
trap x0
trap x03
and R7, R7, xf
add R7, R7, #-15
brz #1
trap x0
trap x65
and R7, R7, xf
add R7, R7, #-9
brz #1
trap x0
trap x72
and R7, R7, xf
add R7, R7, #-10
brz #1
trap x0
trap x61
and R7, R7, xf
add R7, R7, #-3
brz #1
trap x0
.fill #61542
.blkw 405
brnzp #1
.blkw #3
st R0, #28
ld R0, #-2
puts
.blkw 30
.fill 65017
.blkw x300
.end