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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-05-23 18:22:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-25 16:17:32 +0200 |
| commit | 0d201ff077a8160f1bba570a767ea98e901f3323 (patch) | |
| tree | a42276d5b2872136db2686c26a886c588bbaa895 /arch/s390 | |
| parent | d7aa3f13e146418b7cbf12e64f1e2cb0261681ca (diff) | |
| download | linux-exynos-0d201ff077a8160f1bba570a767ea98e901f3323.tar.gz linux-exynos-0d201ff077a8160f1bba570a767ea98e901f3323.tar.bz2 linux-exynos-0d201ff077a8160f1bba570a767ea98e901f3323.zip | |
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 <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/lib/mem.S | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/s390/lib/mem.S b/arch/s390/lib/mem.S index d66751397e72..e1fa974ac500 100644 --- a/arch/s390/lib/mem.S +++ b/arch/s390/lib/mem.S @@ -7,6 +7,9 @@ #include <linux/linkage.h> #include <asm/export.h> +#include <asm/nospec-insn.h> + + GEN_BR_THUNK %r14 /* * void *memmove(void *dest, const void *src, size_t n) @@ -33,14 +36,14 @@ ENTRY(memmove) .Lmemmove_forward_remainder: larl %r5,.Lmemmove_mvc ex %r4,0(%r5) - br %r14 + BR_EX %r14 .Lmemmove_reverse: ic %r0,0(%r4,%r3) stc %r0,0(%r4,%r1) brctg %r4,.Lmemmove_reverse ic %r0,0(%r4,%r3) stc %r0,0(%r4,%r1) - br %r14 + BR_EX %r14 .Lmemmove_mvc: mvc 0(1,%r1),0(%r3) EXPORT_SYMBOL(memmove) @@ -77,7 +80,7 @@ ENTRY(memset) .Lmemset_clear_remainder: larl %r3,.Lmemset_xc ex %r4,0(%r3) - br %r14 + BR_EX %r14 .Lmemset_fill: stc %r3,0(%r2) cghi %r4,1 @@ -94,7 +97,7 @@ ENTRY(memset) .Lmemset_fill_remainder: larl %r3,.Lmemset_mvc ex %r4,0(%r3) - br %r14 + BR_EX %r14 .Lmemset_xc: xc 0(1,%r1),0(%r1) .Lmemset_mvc: @@ -117,7 +120,7 @@ ENTRY(memcpy) .Lmemcpy_remainder: 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) |