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Error generation on accessing Special purpose register.

nancy

I am trying to write on a register using the following command:

asm("ldr r0, =0x00");

asm("MSR ICC_SEIEN_EL1, r0") ;

and getting this error:

tmp/ccnn8Apc.s: Assembler messages:

/tmp/ccnn8Apc.s:93787: Error: selected processor does not support requested special purpose register -- `msr ICC_SEIEN_EL1,r0'

Can somebody help me in finding out the root cause of this issue.

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  • 0 in reply to nancy

    HI,

    Apologies, I have confused you. Martin was right in his advice earlier to use MRC/MCR when accessing these registers in AArch32. Sorry about that.

    I see that you have found the correct syntax for the MCR instruction. p15 is the coprocessor number which you were missing before. May I ask what error you are now seeing?

    Chris

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  • 0 in reply to nancy

    HI,

    Apologies, I have confused you. Martin was right in his advice earlier to use MRC/MCR when accessing these registers in AArch32. Sorry about that.

    I see that you have found the correct syntax for the MCR instruction. p15 is the coprocessor number which you were missing before. May I ask what error you are now seeing?

    Chris

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