dpu - By: Dave Mariano

DPU - Dave Processng Unit

The Dave Processing Unit is a virtual 32-bit ARM CPU. This CPU uses a Load/Store architecture and a register file of 16 registers. It is capable of reading a file into memory, writing memory to a file, modifying memory, memory dumps, displaying registers, and executing instructions. The 32-bit instruction register holds 2 instructions at a time, as 16-bit thumb instructions are used. Instruction types include Immediate, Load/Store, Data Processing, Branch, Conditional Branch, Data Processing, and Push/Pull.

Instruction Set

Load/Store

• LDB
• LDR
• STB
• STR

Push/Pull

• PSH
• PSHH
• PSHR
• PUL
• PULR
• PULH

Immediate

• MOV
• CMP
• ADD
• SUB

Data Processing

• AND
• EOR
• SUB
• SXB
• ADD
• ADC
• LSR
• LSL
• TST
• TEQ
• CMP
• ROR
• ORR
• MOV
• BIC
• MVN

Branches

• BRA
• BRL
• BEQ
• BNE
• BCS
• BCC
• BMI
• BPL
• BHI
• BLS
• BAL