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@ellerman.id.au>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201126131006.2431205-7-mpe@ellerman.id.au

diff --git a/arch/powerpc/include/asm/vdso/gettimeofday.h b/arch/powerpc/include/asm/vdso/gettimeofday.h
index 43dd1dc..6f56a6b 100644 (file)
--- 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, -PPC_MIN_STKFRM(r1)
        PPC_STL         r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)
+#ifdef __powerpc64__
+       PPC_STL         r2, PPC_MIN_STKFRM + STK_GOT(r1)
+#endif
        get_datapage    r5, r0
        addi            r5, r5, VDSO_DATA_OFFSET
        bl              DOTSYM(\funct)
        PPC_LL          r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)
+#ifdef __powerpc64__
+       PPC_LL          r2, PPC_MIN_STKFRM + STK_GOT(r1)
+#endif
        cmpwi           r3, 0
        mtlr            r0
   .cfi_restore lr
@@ -42,10 +48,16 @@
   .cfi_register lr, r0
        PPC_STLU        r1, -PPC_MIN_STKFRM(r1)
        PPC_STL         r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)
+#ifdef __powerpc64__
+       PPC_STL         r2, PPC_MIN_STKFRM + STK_GOT(r1)
+#endif
        get_datapage    r4, r0
        addi            r4, r4, VDSO_DATA_OFFSET
        bl              DOTSYM(\funct)
        PPC_LL          r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)
+#ifdef __powerpc64__
+       PPC_LL          r2, PPC_MIN_STKFRM + STK_GOT(r1)
+#endif
        crclr           so
        mtlr            r0
   .cfi_restore lr