linux-kernel - Re: [PATCH] powerpc/ppc-opcode: Fix PPC_RAW

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Date:   Wed, 03 Aug 2022 21:15:06 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/ppc-opcode: Fix PPC_RAW_TW()

Christophe Leroy wrote:
> PPC_RAW_TW() is erroneously defined with base code 0x7f000008
> instead of 0x7c000008.
> 
> That's invisible because its only user is PPC_RAW_TRAP() which is
> 0x7fe00008, but fix it anyway to avoid any risk of future bug.
> 
> Reported-by: Naveen N. Rao <naveen.n.rao@...ux.ibm.com>
> Fixes: d00d762daf12 ("powerpc/ppc-opcode: Define and use PPC_RAW_TRAP() and PPC_RAW_TW()")
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/include/asm/ppc-opcode.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Thanks.
Reviewed-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>

> 
> diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
> index d9703c5fd713..c6d724104ed1 100644
> --- a/arch/powerpc/include/asm/ppc-opcode.h
> +++ b/arch/powerpc/include/asm/ppc-opcode.h
> @@ -571,7 +571,7 @@
>  
>  #define PPC_RAW_BRANCH(offset)		(0x48000000 | PPC_LI(offset))
>  #define PPC_RAW_BL(offset)		(0x48000001 | PPC_LI(offset))
> -#define PPC_RAW_TW(t0, a, b)		(0x7f000008 | ___PPC_RS(t0) | ___PPC_RA(a) | ___PPC_RB(b))
> +#define PPC_RAW_TW(t0, a, b)		(0x7c000008 | ___PPC_RS(t0) | ___PPC_RA(a) | ___PPC_RB(b))
>  #define PPC_RAW_TRAP()			PPC_RAW_TW(31, 0, 0)
>  #define PPC_RAW_SETB(t, bfa)		(0x7c000100 | ___PPC_RT(t) | ___PPC_RA((bfa) << 2))
>  
> -- 
> 2.36.1
> 
>