s390: extend expoline to BC instructions

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[ Upstream commit 6deaa3bbca ]

The BPF JIT uses a 'b <disp>(%r<x>)' instruction in the definition
of the sk_load_word and sk_load_half functions.

Add support for branch-on-condition instructions contained in the
thunk code of an expoline.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Martin Schwidefsky 2018-05-23 18:22:08 +02:00 • committed by Greg Kroah-Hartman

parent a206c82f9b

commit 457b944b61

2 changed files with 77 additions and 5 deletions

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57

arch/s390/include/asm/nospec-insn.h

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25

arch/s390/kernel/nospec-branch.c

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