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s390/lib: use expoline for indirect branches
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>
This commit is contained in:
parent
467a3bf219
commit
97489e0663
@ -7,6 +7,9 @@
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#include <linux/linkage.h>
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#include <asm/export.h>
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#include <asm/nospec-insn.h>
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GEN_BR_THUNK %r14
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/*
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* void *memmove(void *dest, const void *src, size_t n)
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@ -33,14 +36,14 @@ ENTRY(memmove)
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.Lmemmove_forward_remainder:
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larl %r5,.Lmemmove_mvc
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ex %r4,0(%r5)
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br %r14
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BR_EX %r14
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.Lmemmove_reverse:
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ic %r0,0(%r4,%r3)
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stc %r0,0(%r4,%r1)
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brctg %r4,.Lmemmove_reverse
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ic %r0,0(%r4,%r3)
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stc %r0,0(%r4,%r1)
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br %r14
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BR_EX %r14
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.Lmemmove_mvc:
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mvc 0(1,%r1),0(%r3)
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EXPORT_SYMBOL(memmove)
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@ -77,7 +80,7 @@ ENTRY(memset)
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.Lmemset_clear_remainder:
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larl %r3,.Lmemset_xc
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ex %r4,0(%r3)
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br %r14
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BR_EX %r14
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.Lmemset_fill:
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cghi %r4,1
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lgr %r1,%r2
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@ -95,10 +98,10 @@ ENTRY(memset)
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stc %r3,0(%r1)
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larl %r5,.Lmemset_mvc
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ex %r4,0(%r5)
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br %r14
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BR_EX %r14
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.Lmemset_fill_exit:
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stc %r3,0(%r1)
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br %r14
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BR_EX %r14
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.Lmemset_xc:
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xc 0(1,%r1),0(%r1)
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.Lmemset_mvc:
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@ -121,7 +124,7 @@ ENTRY(memcpy)
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.Lmemcpy_remainder:
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larl %r5,.Lmemcpy_mvc
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ex %r4,0(%r5)
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br %r14
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BR_EX %r14
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.Lmemcpy_loop:
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mvc 0(256,%r1),0(%r3)
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la %r1,256(%r1)
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@ -159,10 +162,10 @@ ENTRY(__memset\bits)
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\insn %r3,0(%r1)
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larl %r5,.L__memset_mvc\bits
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ex %r4,0(%r5)
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br %r14
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BR_EX %r14
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.L__memset_exit\bits:
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\insn %r3,0(%r2)
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br %r14
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BR_EX %r14
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.L__memset_mvc\bits:
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mvc \bytes(1,%r1),0(%r1)
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.endm
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