[PATCH v3 1/3] arm64: ptrauth: add pointer authentication Armv8.6 enhanced feature

[Mark Brown]

On Tue, Jun 23, 2020 at 06:46:28PM +0530, Amit Daniel Kachhap wrote:
> On 6/22/20 7:52 PM, Dave Martin wrote:

> > > @@ -335,6 +356,9 @@ asmlinkage void notrace el0_sync_compat_handler(struct pt_regs *regs)
> > >   	case ESR_ELx_EC_BKPT32:
> > >   		el0_dbg(regs, esr);
> > >   		break;
> > > +	case ESR_ELx_EC_FPAC:
> > > +		el0_fpac(regs, esr);
> > > +		break;

> > Can this exception ever happen?  I thought ptrauth doesn't exist for
> > AArch32.

> This path will be taken during FPAC fault from userspace(EL0). Am I missing
> something here?

This one is in the compat handler so should only be generated from
AArch32 context.
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