ARM Assembly Language Programming by Peter J Cockerell

By Peter J Cockerell

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E. to or from the processor), we will explain only one of the instructions in detail - STR. Notes about LDR follow this description. STR Store a word or byte Addressing modes When storing data into memory, you have to be able to specify the desired location. There are two main ways of giving the address, called addressing modes. These are known as pre-indexed and post-indexed addressing. Pre-indexed addressing Pre-indexed addressing is specified as below: STR{cond} ,[{,}] is the register from which the data is to be transferred to memory.

The ADD instruction below adds 65536 (&1000) to R0: ADD R0, R0, #&1000 To get this number, the assembler might use a position value of 8 and value of 1, though other combinations could also be used. Shifted operands If the operand is a register, it may be manipulated in various ways before it is used in the instruction. The contents of the register aren't altered, just the value given to the ALU, as applied to this operation (unless the same register is also used as the result, of course).

Instead, they have a facility for adding co-processors. A co-processor is a separate chip which executes special-purpose instructions which the ARM CPU alone cannot handle. The first such processor will be one to implement floating point instructions. These instructions have already been defined, and are currently implemented by software. The machine codes which are allocated to them are illegal instructions on the ARM-I so system software can be used to 'trap' them and perform the required action, albeit a lot slower than the co-processor would.

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