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How to trap Guest data aborts

armdev over 10 years ago

Hi,

I am trying to understand if Guest OS data abort happens due to accessing some memory (e.g GIC distributor space) then is there any way I can route it to EL2 mode ?

I looked into HCR_EL2 register bits and tried setting AMO bit but it doesn't help. I see the control still reaching to EL1 Syn handler.

I would like to provide some RW memory functionality from EL2 so I want to trap it ?

Thanks.

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0 Martin Weidmann over 10 years ago in reply to armdev

When exactly do they change? If you write the register and read is back immediately, what value do you see?
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0 Martin Weidmann over 10 years ago in reply to armdev

When exactly do they change? If you write the register and read is back immediately, what value do you see?
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0 armdev over 10 years ago in reply to Martin Weidmann

Hi Martin,
I am writing MAIR_EL1 value as 0x000000FF440C0400 and I can see from DS-5 debugger this value but as soon as I enable MMU writing to SCTLR_EL1 the value in MAIR_EL1 changes to 0x000000CC440C0400 which I see in DS-5.

Thanks.
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