linux-kernel - Re: [PATCH 2/4] arm64/ptrace: introduce orig_x7 in the user_pt

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Message-ID: <20210326183924.GF5126@arm.com>
Date:   Fri, 26 Mar 2021 18:39:24 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Andrei Vagin <avagin@...il.com>
Cc:     Will Deacon <will@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Martin <Dave.Martin@....com>,
        Keno Fischer <keno@...iacomputing.com>
Subject: Re: [PATCH 2/4] arm64/ptrace: introduce orig_x7 in the user_pt_regs
 structure

On Mon, Mar 22, 2021 at 03:50:51PM -0700, Andrei Vagin wrote:
> diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
> index d4cdf98ac003..1008f0fbc5ea 100644
> --- a/arch/arm64/include/asm/ptrace.h
> +++ b/arch/arm64/include/asm/ptrace.h
> @@ -184,6 +184,7 @@ struct pt_regs {
>  			u64 pc;
>  			u64 pstate;
>  			u64 orig_x0;
> +			u64 orig_x7;
>  		};
>  	};
>  #ifdef __AARCH64EB__
> diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h
> index 3c118c5b0893..be7583ff5f4d 100644
> --- a/arch/arm64/include/uapi/asm/ptrace.h
> +++ b/arch/arm64/include/uapi/asm/ptrace.h
> @@ -91,6 +91,7 @@ struct user_pt_regs {
>  	__u64		pc;
>  	__u64		pstate;
>  	__u64		orig_x0;
> +	__u64		orig_x7;
>  };

Same here. So unless I miss something, we better have a separate
NT_ORIGREG (or some better name) regset to retrieve the additional
registers. Or, if you want to get all of them in one go, just add a
new one similar to NT_PRSTATUS but which restores x0 to orig_x0 and x7
to orig_x7.

Sorry if this was already discussed. I had a brief look at the previous
versions and couldn't see a user_pt_regs structure change, nor a
suggestion to do so.

-- 
Catalin