gicv3 aarch32 icc_hsre


I am working with GICV3 on a Cortex A53 that is currently in aarcH32 EL2 state.

When I try to read the ICC_HSRE I get an undefined instruction and the system crashes.

The instruction I am using is 

mrc p15, 4, r7, c12, c9, 5 @ ICC_HSRE

Any idea what is wrong here, and why I get an undefined instruction.

In aarch32 EL2, I am pretty sure this is the register that should be used to access the GIC System Register Enable Register? 

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