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can coprocessor instruction be produced by compiler from c code

Note: This was originally posted on 18th April 2013 at http://forums.arm.com

can accessing coprocessor instruction be produced by compiler from c code？

except float point instructions?

such like drain write buffer instruction?

any docs describe detail of this?

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Martin Weidmann over 12 years ago

Note: This was originally posted on 18th April 2013 at http://forums.arm.com

Which compiler?

If you are using armcc, I'd probably use the "named register" feature. This lets you declare a variable and tie to a coprocessor register (or other kind of register). Then whenever you access the variable the compiler will generate suitable coprocessor instructions. So:

egister unsigned int cp15_control __asm("cp15:0:c1:c0:0");

This ties the variable to the coprocessor register "cp15:0:c1:c0:0".

http://infocenter.arm.com/help/topic/com.arm.doc.dui0491i/CJAHJDBG.html

I believe GCC has a similar feature, but not sure of the syntax.
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Martin Weidmann over 12 years ago

Note: This was originally posted on 18th April 2013 at http://forums.arm.com

Which compiler?

If you are using armcc, I'd probably use the "named register" feature. This lets you declare a variable and tie to a coprocessor register (or other kind of register). Then whenever you access the variable the compiler will generate suitable coprocessor instructions. So:

egister unsigned int cp15_control __asm("cp15:0:c1:c0:0");

This ties the variable to the coprocessor register "cp15:0:c1:c0:0".

http://infocenter.arm.com/help/topic/com.arm.doc.dui0491i/CJAHJDBG.html

I believe GCC has a similar feature, but not sure of the syntax.
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