September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Virtual code
Obviously, we did not write all of the preceding code just for fun; we need to write some code for the virtual processor. Since the architecture is very limited and restricted to a specific task, there are not too many options as to what the code may look like:
; Virtual code ; Binary outputvm_code_start: vm_load_key ; 0x00 vm_load_data_length ; 0x02 vm_nop ; 0x01 .encryption_loop: vm_load_data_byte register_b ; 0x30 0x01 vm_encrypt register_b ; 0x20 0x01 vm_store_data_byte register_b ; 0x31 0x01 vm_loop .encryption_loop ; 0x10 0xf5 0xff 0xff 0xff vm_exit ; 0x12
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