By Vincent Mahout
ARM designs the cores of microcontrollers which equip so much "embedded structures" in accordance with 32-bit processors. Cortex M3 is this type of designs, lately constructed via ARM with microcontroller functions in brain. To conceive a very optimized piece of software program (as is frequently the case on this planet of embedded platforms) it is usually essential to understand how to software in an meeting language. This publication explains the fundamentals of programming in an meeting language, whereas being in response to the structure of Cortex M3 intimately and constructing many examples. it truly is written for those that have by no means pr. Read more...
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Additional resources for Assembly Language Programming : ARM Cortex-M3
The programmer manages his or her own stacks on the stack system, and does not have to worry about this 8-byte alignment. The usefulness of this directive becomes apparent when the code written in assembly language is interfaced with code written in C language. The compiler can, in some cases (use of floating-point numbers, for example), “require” this functional principle for the system stack. It is therefore normal to find a way to specify such a systematic alignment and thus to have the directives that it produces.
Use of local labels Procedure1 3Procedure1 4Procedure1 Others 3Others 3 ROUT ; ROUT doesn't mean routine ! … ; Code … ; Code … ; Code BEQ %4Procedure1 ; No ambiguity … ; Code BGE %3 ; The target is 3Procedure1 … ; Code … ; Code … ; Code ROUT ; Border of visibility BEQ %3 ; The target is now 3Others … ; Code … ; Code ROUT ; Border but without the option [name] … ; Code … ; Code Possible too… ; ... but not very readable B %3 ; Branch to the label 3 ... GET filename INCBIN filename This allows us to insert (GET) the file filename into the current file.
As this is always the case, this bit is always at 1. We could question the usefulness of this information. As a matter of fact, it is useless in the case of Cortex-M3, but in other architectures this bit can be at 0 to show that the processor is using the ARM set and not Thumb; - it uses bit fields [10–15] and [25–26] to store two pieces of overlapping information (the two uses are mutually exclusive): ICI or IT; - for ICI, this is information that is stored when a read/write multiple (the processor reads/writes several general registers successively, but uses only one instruction) is interrupted.
Assembly Language Programming : ARM Cortex-M3 by Vincent Mahout