linux-kernel - Re: [RFC v5 33/38] powerpc: Deliver SEGV signal on pkey violation

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Message-Id: <4cbcc16c-7597-7aa1-ddea-b6bef25df11b@linux.vnet.ibm.com>
Date:   Mon, 10 Jul 2017 08:38:53 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Ram Pai <linuxram@...ibm.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, x86@...nel.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, dave.hansen@...el.com, hbabu@...ibm.com,
        arnd@...db.de, akpm@...ux-foundation.org, corbet@....net,
        mingo@...hat.com
Subject: Re: [RFC v5 33/38] powerpc: Deliver SEGV signal on pkey violation

On 07/06/2017 02:52 AM, Ram Pai wrote:
> The value of the AMR register at the time of exception
> is made available in gp_regs[PT_AMR] of the siginfo.
> 
> The value of the pkey, whose protection got violated,
> is made available in si_pkey field of the siginfo structure.
> 
> Signed-off-by: Ram Pai <linuxram@...ibm.com>
> ---
>  arch/powerpc/include/uapi/asm/ptrace.h |    3 ++-
>  arch/powerpc/kernel/signal_32.c        |    5 +++++
>  arch/powerpc/kernel/signal_64.c        |    4 ++++
>  arch/powerpc/kernel/traps.c            |   14 ++++++++++++++
>  4 files changed, 25 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/powerpc/include/uapi/asm/ptrace.h b/arch/powerpc/include/uapi/asm/ptrace.h
> index 8036b38..7ec2428 100644
> --- a/arch/powerpc/include/uapi/asm/ptrace.h
> +++ b/arch/powerpc/include/uapi/asm/ptrace.h
> @@ -108,8 +108,9 @@ struct pt_regs {
>  #define PT_DAR	41
>  #define PT_DSISR 42
>  #define PT_RESULT 43
> -#define PT_DSCR 44
>  #define PT_REGS_COUNT 44
> +#define PT_DSCR 44
> +#define PT_AMR	45

Why PT_DSCR was moved down ? This change is redundant here.