From 5ce9dc0f76519ac7ef2d861172ae280fc9d6c3e2 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Wed, 23 May 2018 18:21:30 +0200 Subject: s390/lib: use expoline for indirect branches [ Upstream commit 97489e0663fa700d6e7febddc43b58df98d7bcda ] The return from the memmove, memset, memcpy, __memset16, __memset32 and __memset64 functions are done with "br %r14". These are indirect branches as well and need to use execute trampolines for CONFIG_EXPOLINE=y. Cc: stable@vger.kernel.org # 4.16 Fixes: f19fbd5ed6 ("s390: introduce execute-trampolines for branches") Reviewed-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/lib/mem.S | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'arch') diff --git a/arch/s390/lib/mem.S b/arch/s390/lib/mem.S index c6d553e85ab1..16c5998b9792 100644 --- a/arch/s390/lib/mem.S +++ b/arch/s390/lib/mem.S @@ -5,6 +5,9 @@ */ #include +#include + + GEN_BR_THUNK %r14 /* * memset implementation @@ -38,7 +41,7 @@ ENTRY(memset) .Lmemset_clear_rest: larl %r3,.Lmemset_xc ex %r4,0(%r3) - br %r14 + BR_EX %r14 .Lmemset_fill: stc %r3,0(%r2) cghi %r4,1 @@ -55,7 +58,7 @@ ENTRY(memset) .Lmemset_fill_rest: larl %r3,.Lmemset_mvc ex %r4,0(%r3) - br %r14 + BR_EX %r14 .Lmemset_xc: xc 0(1,%r1),0(%r1) .Lmemset_mvc: @@ -77,7 +80,7 @@ ENTRY(memcpy) .Lmemcpy_rest: larl %r5,.Lmemcpy_mvc ex %r4,0(%r5) - br %r14 + BR_EX %r14 .Lmemcpy_loop: mvc 0(256,%r1),0(%r3) la %r1,256(%r1) -- cgit v1.2.3