linux-kernel - RE: [PATCH v11 05/37] x86/trapnr: Add event type macros to <asm/trapnr.h>

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Date:   Wed, 27 Sep 2023 05:15:20 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
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        Nikolay Borisov <nik.borisov@...e.com>,
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Subject: RE: [PATCH v11 05/37] x86/trapnr: Add event type macros to
 <asm/trapnr.h>

> >> +EVENT_TYPE_PRIV_SWEXC    5    // INT1 #define EVENT_TYPE_SWEXC    6
> >> +// INTO, INT3
> >
> > nit: This turned into INTO (Oh) rather than INT0( zero) in v11
> 
> Yes, v11 corrected a bug in v10.
> 
> The INTO instruction is "INT on Overflow".  No zero involved.
> 
> INT3 is thusly named because it generates vector 3.  Similarly for INT1 although it
> had the unofficial name ICEBP long before INT1 got documented.
> 
> If INTO were to have a number, it would need to be 4, but it's behaviour is
> conditional on the overflow flag, unlike INT3/1 which are unconditional
> exceptions.

live x86 SDM!