linux-kernel - Re: [PATCH v3 5/5] arm64: Add HAVE_REGS_AND_STACK_ACCESS

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Message-ID: <20141118145228.GN18842@arm.com>
Date:	Tue, 18 Nov 2014 14:52:29 +0000
From:	Will Deacon <will.deacon@....com>
To:	David Long <dave.long@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	William Cohen <wcohen@...hat.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/5] arm64: Add HAVE_REGS_AND_STACK_ACCESS_API feature

Hi David,

On Tue, Nov 18, 2014 at 06:32:55AM +0000, David Long wrote:
> From: "David A. Long" <dave.long@...aro.org>
> 
> Add HAVE_REGS_AND_STACK_ACCESS_API feature for arm64.

[...]

> diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
> index d3e782a..24cc048 100644
> --- a/arch/arm64/include/asm/ptrace.h
> +++ b/arch/arm64/include/asm/ptrace.h
> @@ -111,6 +111,8 @@ struct pt_regs {
>  	u64 syscallno;
>  };
>  
> +#define MAX_REG_OFFSET (offsetof(struct pt_regs, orig_x0))

Is orig_x0 actually useful to this API? If not, we could instead operate on
the user_pt_regs structure, and define the maximum offset in terms of sizeof
that.

> +#define ARM_cpsr	pstate
> +#define ARM_pc		pc
> +#define ARM_sp		sp
> +#define ARM_lr		regs[30]
> +#define ARM_fp		regs[29]
> +#define ARM_x28		regs[28]
> +#define ARM_x27		regs[27]

[...]

I don't think we need these #defines.

Will
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