linux-kernel - Re: [RFC 1/8] ARM64: Move BRK opcodes defines from kprobes.h to insn.h

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Message-ID: <20150108165506.GP11583@arm.com>
Date:	Thu, 8 Jan 2015 16:55:07 +0000
From:	Will Deacon <will.deacon@....com>
To:	Pratyush Anand <panand@...hat.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"tixy@...aro.org" <tixy@...aro.org>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	"sandeepa.prabhu@...aro.org" <sandeepa.prabhu@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"anil.s.keshavamurthy@...el.com" <anil.s.keshavamurthy@...el.com>,
	"masami.hiramatsu.pt@...achi.com" <masami.hiramatsu.pt@...achi.com>,
	"wcohen@...hat.com" <wcohen@...hat.com>,
	"oleg@...hat.com" <oleg@...hat.com>
Subject: Re: [RFC 1/8] ARM64: Move BRK opcodes defines from kprobes.h to
 insn.h

On Wed, Dec 31, 2014 at 03:21:17PM +0000, Pratyush Anand wrote:
> Its better to keep all BRK opcodes used by kprobes and uprobes at one
> place. Therefore move these defines to asm/insn.h.
> 
> Signed-off-by: Pratyush Anand <panand@...hat.com>
> ---
>  arch/arm64/include/asm/insn.h | 6 ++++++
>  arch/arm64/kernel/kprobes.h   | 7 +------
>  2 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
> index e2ff32a93b5c..87fa48746806 100644
> --- a/arch/arm64/include/asm/insn.h
> +++ b/arch/arm64/include/asm/insn.h
> @@ -23,6 +23,12 @@
>  /* A64 instructions are always 32 bits. */
>  #define	AARCH64_INSN_SIZE		4
>  
> +/* BRK opcodes with ESR encoding  */
> +#define BRK64_ESR_MASK		0xFFFF
> +#define BRK64_ESR_KPROBES	0x0004
> +#define BRK64_OPCODE_KPROBES	0xD4200080	/* "brk 0x4" */

These might be better off in debug-monitors.h, but I guess that's for the
kprobes series to sort out.

> +#define ARCH64_NOP_OPCODE	0xD503201F

We have aarch64_insn_gen_nop for this.

Will
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