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From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	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
Subject: [PATCH v9 3/5] powerpc/vdso: Save and restore TOC pointer on PPC64
Date: Tue,  4 Aug 2020 11:47:50 +0000 (UTC)	[thread overview]
Message-ID: <459ef960fb08d51962b9dba4dfba247f102d149d.1596541334.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <cover.1596541334.git.christophe.leroy@csgroup.eu>

On PPC64, the TOC pointer needs to be saved and restored.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.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.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 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 0b6fa245d54e..fa774086173b 100644
--- a/arch/powerpc/include/asm/vdso/gettimeofday.h
+++ b/arch/powerpc/include/asm/vdso/gettimeofday.h
@@ -13,10 +13,16 @@
 	PPC_STLU	r1, -STACK_FRAME_OVERHEAD(r1)
   .cfi_register lr, r0
 	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
@@ -36,10 +42,16 @@
 	PPC_STLU	r1, -STACK_FRAME_OVERHEAD(r1)
   .cfi_register lr, r0
 	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

  parent reply	other threads:[~2020-08-04 11:47 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-04 11:47 [PATCH v9 0/5] powerpc: switch VDSO to C implementation Christophe Leroy
2020-08-04 11:47 ` [PATCH v9 1/5] powerpc/processor: Move cpu_relax() into asm/vdso/processor.h Christophe Leroy
2020-08-04 11:47   ` Christophe Leroy
2020-08-04 11:47 ` [PATCH v9 2/5] powerpc/vdso: Prepare for switching VDSO to generic C implementation Christophe Leroy
2020-08-04 11:47   ` Christophe Leroy
2020-08-04 11:47 ` Christophe Leroy [this message]
2020-08-04 11:47   ` [PATCH v9 3/5] powerpc/vdso: Save and restore TOC pointer on PPC64 Christophe Leroy
2020-08-04 11:47 ` [PATCH v9 4/5] powerpc/vdso: Switch VDSO to generic C implementation Christophe Leroy
2020-08-04 11:47 ` [PATCH v9 5/5] powerpc/vdso: Provide __kernel_clock_gettime64() on vdso32 Christophe Leroy
2020-08-04 11:47   ` Christophe Leroy

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