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how can I return a value within embedded assembler?

Sebastian Gaertner
Note: This was originally posted on 8th May 2009 at http://forums.arm.com

Hi,

does anybody know how I can write an embedded ASM function that returns the actual PSR value? I prefered to go on like this:

int getCpsr( void )
{
  int currentCPSR;
  MRS currentCPSR, CPSR
  return currentCPSR;
}

how can I return a value within embedded assembler?
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  • Note: This was originally posted on 8th May 2009 at http://forums.arm.com

    Thanks,

    but this is also ARM machine language instruction. I cannot use this inline assembler
    __asm".....


    In this context, AFAIK, it is not inline assembler.  This is just telling the compiler to treat _cpsr as the if it were the APSR register in Cortex-M3 and it will generate the appropriate instructions for you when you use the _cpsr variable.
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  • Note: This was originally posted on 8th May 2009 at http://forums.arm.com

    Thanks,

    but this is also ARM machine language instruction. I cannot use this inline assembler
    __asm".....


    In this context, AFAIK, it is not inline assembler.  This is just telling the compiler to treat _cpsr as the if it were the APSR register in Cortex-M3 and it will generate the appropriate instructions for you when you use the _cpsr variable.
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