Re: [PATCH v2 2/6] arm64: trap to EL1 accesses to AMU counters from EL0
From: Valentin Schneider <hidden>
Date: 2020-01-23 17:04:38
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On 18/12/2019 18:26, Ionela Voinescu wrote:
+/* + * reset_amuserenr_el0 - reset AMUSERENR_EL0 if AMUv1 present + */ + .macro reset_amuserenr_el0, tmpreg + mrs \tmpreg, id_aa64pfr0_el1 // Check ID_AA64PFR0_EL1 + ubfx \tmpreg, \tmpreg, #ID_AA64PFR0_AMU_SHIFT, #4 + cbz \tmpreg, 9000f // Skip if no AMU present + msr_s SYS_AMUSERENR_EL0, xzr // Disable AMU access from EL0 +9000:
AIUI you can steer away from the obscure numbering scheme and define the label using the macro counter: cbz \tmpreg, .Lskip_\@ [...] .Lskip_\@: .endm
+ .endm
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