From 9e9792d3ffc813a6aef88a06891fbc13c96b979a Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Mon, 6 Aug 2018 13:49:47 +0200 Subject: [PATCH] s390/lib: use expoline for all bcr instructions commit 5eda25b10297684c1f46a14199ec00210f3c346e upstream. The memove, memset, memcpy, __memset16, __memset32 and __memset64 function have an additional indirect return branch in form of a "bzr" instruction. These need to use expolines as well. Cc: # v4.17+ Fixes: 97489e0663 ("s390/lib: use expoline for indirect branches") Reviewed-by: Heiko Carstens Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/lib/mem.S | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/arch/s390/lib/mem.S b/arch/s390/lib/mem.S index e7672edc284a..5ff0520784f2 100644 --- a/arch/s390/lib/mem.S +++ b/arch/s390/lib/mem.S @@ -27,7 +27,7 @@ */ ENTRY(memset) ltgr %r4,%r4 - bzr %r14 + jz .Lmemset_exit ltgr %r3,%r3 jnz .Lmemset_fill aghi %r4,-1 @@ -42,12 +42,13 @@ ENTRY(memset) .Lmemset_clear_rest: larl %r3,.Lmemset_xc ex %r4,0(%r3) +.Lmemset_exit: BR_EX %r14 .Lmemset_fill: stc %r3,0(%r2) cghi %r4,1 lgr %r1,%r2 - ber %r14 + je .Lmemset_fill_exit aghi %r4,-2 srlg %r3,%r4,8 ltgr %r3,%r3 @@ -59,6 +60,7 @@ ENTRY(memset) .Lmemset_fill_rest: larl %r3,.Lmemset_mvc ex %r4,0(%r3) +.Lmemset_fill_exit: BR_EX %r14 .Lmemset_xc: xc 0(1,%r1),0(%r1) @@ -73,7 +75,7 @@ EXPORT_SYMBOL(memset) */ ENTRY(memcpy) ltgr %r4,%r4 - bzr %r14 + jz .Lmemcpy_exit aghi %r4,-1 srlg %r5,%r4,8 ltgr %r5,%r5 @@ -82,6 +84,7 @@ ENTRY(memcpy) .Lmemcpy_rest: larl %r5,.Lmemcpy_mvc ex %r4,0(%r5) +.Lmemcpy_exit: BR_EX %r14 .Lmemcpy_loop: mvc 0(256,%r1),0(%r3) -- 2.20.1