linux-kernel - Re: [PATCH v4 2/6] arm64: Add more test functions to insn.c

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Date:	Wed, 14 Jan 2015 15:02:00 +0530
From:	Pratyush Anand <pratyush.anand@...il.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>,
	Steve Capper <steve.capper@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....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, linux-kernel@...r.kernel.org,
	Pratyush Anand <panand@...hat.com>
Subject: Re: [PATCH v4 2/6] arm64: Add more test functions to insn.c

On Sun, Jan 11, 2015 at 9:33 AM, David Long <dave.long@...aro.org> wrote:
> From: "David A. Long" <dave.long@...aro.org>
>
> Certain instructions are hard to execute correctly out-of-line (as in
> kprobes).  Test functions are added to insn.[hc] to identify these.  The
> instructions include any that use PC-relative addressing, change the PC,
> or change interrupt masking. For efficiency and simplicity test
> functions are also added for small collections of related instructions.
>
> Signed-off-by: David A. Long <dave.long@...aro.org>
> ---
>  arch/arm64/include/asm/insn.h | 21 +++++++++++++++++++--
>  arch/arm64/kernel/insn.c      | 18 ++++++++++++++++++
>  2 files changed, 37 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
> index e2ff32a..466afd4 100644
> --- a/arch/arm64/include/asm/insn.h
> +++ b/arch/arm64/include/asm/insn.h
> @@ -223,8 +223,13 @@ static __always_inline bool aarch64_insn_is_##abbr(u32 code) \
>  static __always_inline u32 aarch64_insn_get_##abbr##_value(void) \
>  { return (val); }
>
> +__AARCH64_INSN_FUNCS(adr,      0x9F000000, 0x10000000)

Should n't it be
__AARCH64_INSN_FUNCS(adr_adrp,      0x1F000000, 0x10000000)

So, that it also take care about adrp

> +__AARCH64_INSN_FUNCS(prfm_lit, 0xFF000000, 0xD8000000)

[...]

>
> +bool aarch64_insn_uses_literal(u32 insn)
> +{
> +       /* ldr/ldrsw (literal), prfm */
> +
> +       return aarch64_insn_is_ldr_lit(insn) ||
> +               aarch64_insn_is_ldrsw_lit(insn) ||

also aarch64_insn_is_adr_adrp(insn) ||


> +               aarch64_insn_is_prfm_lit(insn);
> +}
> +
> +bool aarch64_insn_is_branch(u32 insn)
> +{
> +       /* b, bl, cb*, tb*, b.cond, br, blr */
> +
> +       return aarch64_insn_is_b_bl_cb_tb(insn) ||
> +               aarch64_insn_is_br_blr(insn) ||

also aarch64_insn_is_ret(insn) ||

> +               aarch64_insn_is_bcond(insn);
> +}
> +
>  /*
--
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