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Date: Wed, 5 Aug 2020 07:09:24 +0000 (UTC) From: Christophe Leroy <christophe.leroy@...roup.eu> To: Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Michael Ellerman <mpe@...erman.id.au>, nathanl@...ux.ibm.com, anton@...abs.org Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, arnd@...db.de, tglx@...utronix.de, vincenzo.frascino@....com, luto@...nel.org, linux-arch@...r.kernel.org Subject: [PATCH v10 3/5] powerpc/vdso: Save and restore TOC pointer on PPC64 On PPC64, the TOC pointer needs to be saved and restored. Suggested-by: Michael Ellerman <mpe@...erman.id.au> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu> --- 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
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