Architectures and Processors forum ARM7 Programming question!

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ARM7 Programming question!

Velagala J R N D V Reddy over 11 years ago

Hi

I had a doubt about programming the arm7. In which scenario I should use explicitly Assembly language instructions while programming.

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Joseph Yiu over 11 years ago in reply to Velagala J R N D V Reddy +1 verified

A few more: When creating context switching code for an OS. To ensure certain exact timing in some I/O or control operation (e.g. in certain hardware control code that you don't want any change of timing...

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0 Martin Weidmann over 11 years ago in reply to Velagala J R N D V Reddy

There are a few examples then. As Anandshastry suggested, exception handlers (at least the first level handler) are usually written in assembler. Same goes for the vector table and initial reset handler.
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0 Martin Weidmann over 11 years ago in reply to Velagala J R N D V Reddy

There are a few examples then. As Anandshastry suggested, exception handlers (at least the first level handler) are usually written in assembler. Same goes for the vector table and initial reset handler.
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0 Chris Shore over 11 years ago in reply to Martin Weidmann
We could add a few more examples to that list...
Access to machine registers like the CPSR
To use native machine instructions, like SIMD arithmetic, which do not map onto C syntax/semantics
In relatively rare cases, to achieve higher performance than the compiler can achieve
Hope this helps
Chris
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