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Thanks. NOTE; ONLY SERIOUS / RELIABLE RECEIVERS CAN CONTACT. DM ME ON WHATSAPP +44 7529 555638 On Wednesday, December 13, 2023 at 4:22:49 AM UTC+1 Peng Fan wrote: > > Subject: Re: str wzr, [x1, #16]! triggers EL2 unhandled data abort > > > > Hi Peng, > > > > Am 12.12.23 um 08:52 schrieb Peng Fan: > > > Hi Alex, > > > > > >> Subject: Re: str wzr, [x1, #16]! triggers EL2 unhandled data abort > > >> > > >> Hi Peng, > > >> > > >> Am 12.12.23 um 03:42 schrieb Peng Fan: > > >>> Hi All, > > >>> > > >>> > > >>> I am running jailhouse on i.MX9 Cortex-A55, and meet an issue. > > >>> " str wzr, [x1, #16]! " this instruction in EL0 triggers unhanlded > > >>> Data abort in EL2, with ISS is data abort, ISV is 0. > > >>> > > >>> I am not sure why this instruction trigger DC with ISV 0. > > >>> Any ideas are appreciated. > > >>> > > >>> Thanks, > > >>> Peng. > > >> > > >> The Arm architecture cannot provide all information in ISS for > > >> instructions that also update the base register. > > > > > > Does ARM architecture TRM note this? Would you please share me the > > > Chapter? > > > > In my old version of the Arm ARM it's noted in Section D7.2.27 "ESR_ELx, > > Exception Syndrome Register (ELx)" in the description of the ISV bit: > > > Instruction syndrome valid ... > > > This bit is 0 for all faults reported in ESR_EL2 except the following > > > stage 2 > > aborts: > > > • AArch64 loads and stores ... and excluding those with writeback. > > > > > > >> You need to change the code sequence to: > > >> str wzr, [x1, #16] > > >> add x1, x1, #16 > > > > > > Hmm, but gcc generates "str wzr, [x1, #16]!" from c code. > > > > > > This should be common issue I think. > > > > Yes, and I remember that there was some discussion on this on the LKML > > years ago. The raw accessors in Linux like __raw_writel() enforce the > simple > > load/store forms to aid virtualization- > > Thanks very much, I will try this. > > Thanks, > Peng. > > > > > Best regards > > Alex > > > > > > > > > > Thanks, > > > Peng. > > > > > >> > > >> > > >> Best regards > > >> Alex > > -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jailhouse-dev/8bdc0366-2905-4cae-8e6f-24a929f8facen%40googlegroups.com.
