Assembly Language Programming : ARM Cortex-M3 by Vincent Mahout

By Vincent Mahout

ARM designs the cores of microcontrollers which equip so much "embedded platforms" according to 32-bit processors. Cortex M3 is this type of designs, lately constructed through ARM with microcontroller functions in brain. To conceive a very optimized piece of software program (as is usually the case on this planet of embedded platforms) it is usually essential to understand how to software in an meeting language. This e-book explains the Read more...

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For the assembler, labels are equivalent to addresses. The numerical value of a label is the value of the address that it represents. This label can also be the address of an instruction or a piece of data. – In all assembly languages, the concept of label or constant has been expanded: it is possible to attribute a value to a label thanks to the equals (EQU) directive, which we will talk about in Chapter 4. It is the equivalent of a #define in C language. The label takes on the meaning of a numerical size written in symbolic form, which is not necessarily an address.

General registers are thus the most common operands that we come across in a program. ). Whatever the case, the 13 registers will always be seen by the processor as a quantity coded on 32 bits. The programmer is faced with mastering the entire contents of a register when the information that he or she is dealing with only holds a half or a quarter of it. From the coding point of view, it can be interesting to see what the code generated by the assembler looks like. Let us take the simple addition instruction ADD R0,R1 as an example.

It is perfectly possible to replace the standard initialization library with your own library, making the initialization work. This new library could then make the call to the entry point of the application program – the entry point whose name could then be freely chosen by the programmer. – It is possible to replace the PROC/ENDP pair with the FUNCTION/ENDFUNC pair, knowing that the language makes no distinction between procedure and function, unlike certain higher-level languages. 4. The data section A set of directives allows us to reserve memory space that will be used by the program to store data.

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