From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christophe Leroy Subject: [PATCH v10 3/5] powerpc/vdso: Save and restore TOC pointer on PPC64 Date: Wed, 5 Aug 2020 07:09:24 +0000 (UTC) Message-ID: References: Return-path: Received: from pegase1.c-s.fr ([93.17.236.30]:4453 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726459AbgHEHJ0 (ORCPT ); Wed, 5 Aug 2020 03:09:26 -0400 In-Reply-To: Sender: linux-arch-owner@vger.kernel.org List-ID: To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , nathanl@linux.ibm.com, anton@ozlabs.org Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, arnd@arndb.de, tglx@linutronix.de, vincenzo.frascino@arm.com, luto@kernel.org, linux-arch@vger.kernel.org On PPC64, the TOC pointer needs to be saved and restored. Suggested-by: Michael Ellerman Signed-off-by: Christophe Leroy --- v9: New. I'm not sure this is really needed, I can't see the VDSO C code doing anything with r2, at least on ppc64_defconfig. So I let you decide whether you take it or not. --- arch/powerpc/include/asm/vdso/gettimeofday.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/powerpc/include/asm/vdso/gettimeofday.h b/arch/powerpc/include/asm/vdso/gettimeofday.h index e2c462796a22..8ed4329c9fb8 100644 --- a/arch/powerpc/include/asm/vdso/gettimeofday.h +++ b/arch/powerpc/include/asm/vdso/gettimeofday.h @@ -19,10 +19,16 @@ .cfi_register lr, r0 PPC_STLU r1, -STACK_FRAME_OVERHEAD(r1) PPC_STL r0, STACK_FRAME_OVERHEAD + PPC_LR_STKOFF(r1) +#ifdef CONFIG_PPC64 + PPC_STL r2, STACK_FRAME_OVERHEAD + STK_GOT(r1) +#endif get_datapage r5, r0 addi r5, r5, VDSO_DATA_OFFSET bl \funct PPC_LL r0, STACK_FRAME_OVERHEAD + PPC_LR_STKOFF(r1) +#ifdef CONFIG_PPC64 + PPC_LL r2, STACK_FRAME_OVERHEAD + STK_GOT(r1) +#endif cmpwi r3, 0 mtlr r0 .cfi_restore lr @@ -42,10 +48,16 @@ .cfi_register lr, r0 PPC_STLU r1, -STACK_FRAME_OVERHEAD(r1) PPC_STL r0, STACK_FRAME_OVERHEAD + PPC_LR_STKOFF(r1) +#ifdef CONFIG_PPC64 + PPC_STL r2, STACK_FRAME_OVERHEAD + STK_GOT(r1) +#endif get_datapage r4, r0 addi r4, r4, VDSO_DATA_OFFSET bl \funct PPC_LL r0, STACK_FRAME_OVERHEAD + PPC_LR_STKOFF(r1) +#ifdef CONFIG_PPC64 + PPC_LL r2, STACK_FRAME_OVERHEAD + STK_GOT(r1) +#endif crclr so mtlr r0 .cfi_restore lr -- 2.25.0