linux-kernel - Re: [PATCH v1 10/12] powerpc/lib/feature-fixups: Use PPC_RAW

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Date:   Tue, 15 Jun 2021 11:48:49 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        naveen.n.rao@...ux.vnet.ibm.com, jniethe5@...il.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v1 10/12] powerpc/lib/feature-fixups: Use PPC_RAW_xxx()
 macros

Christophe Leroy <christophe.leroy@...roup.eu> writes:
> diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c
> index fe26f2fa0f3f..f0fc521b82ae 100644
> --- a/arch/powerpc/lib/feature-fixups.c
> +++ b/arch/powerpc/lib/feature-fixups.c
> @@ -180,32 +180,31 @@ static void do_stf_exit_barrier_fixups(enum stf_barrier_type types)
>  	start = PTRRELOC(&__start___stf_exit_barrier_fixup);
>  	end = PTRRELOC(&__stop___stf_exit_barrier_fixup);
>  
> -	instrs[0] = 0x60000000; /* nop */
> -	instrs[1] = 0x60000000; /* nop */
> -	instrs[2] = 0x60000000; /* nop */
> -	instrs[3] = 0x60000000; /* nop */
> -	instrs[4] = 0x60000000; /* nop */
> -	instrs[5] = 0x60000000; /* nop */
> +	instrs[0] = PPC_RAW_NOP();
> +	instrs[1] = PPC_RAW_NOP();
> +	instrs[2] = PPC_RAW_NOP();
> +	instrs[3] = PPC_RAW_NOP();
> +	instrs[4] = PPC_RAW_NOP();
> +	instrs[5] = PPC_RAW_NOP();
>  
>  	i = 0;
>  	if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) {
>  		if (cpu_has_feature(CPU_FTR_HVMODE)) {
> -			instrs[i++] = 0x7db14ba6; /* mtspr 0x131, r13 (HSPRG1) */
> -			instrs[i++] = 0x7db04aa6; /* mfspr r13, 0x130 (HSPRG0) */
> +			instrs[i++] = PPC_RAW_MTSPR(SPRN_HSPRG1, _R13);
> +			instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_HSPRG0);
>  		} else {
> -			instrs[i++] = 0x7db243a6; /* mtsprg 2,r13	*/
> -			instrs[i++] = 0x7db142a6; /* mfsprg r13,1    */
> +			instrs[i++] = PPC_RAW_MTSPR(SPRN_SPRG2, _R13);
> +			instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_SPRG1);
>  	        }
> -		instrs[i++] = 0x7c0004ac; /* hwsync		*/
> -		instrs[i++] = 0xe9ad0000; /* ld r13,0(r13)	*/
...
> +		instrs[i++] = PPC_RAW_LD(_R10, _R13, 0);

This conversion was wrong, r13 became r10.

I fixed it up.

cheers