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| author |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-08-06 14:26:39 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-08-07 13:38:16 +0200 |
| commit | 26f843848bae973817b3587780ce6b7b0200d3e4 (patch) | |
| tree | 99617d15709b26b2906ab6f661b7bdd20bd8c597 /arch/s390 | |
| parent | s390/lib: use expoline for all bcr instructions (diff) | |
| download | linux-dev-26f843848bae973817b3587780ce6b7b0200d3e4.tar.xz linux-dev-26f843848bae973817b3587780ce6b7b0200d3e4.zip | |
s390: fix br_r1_trampoline for machines without exrl
For machines without the exrl instruction the BFP jit generates
code that uses an "br %r1" instruction located in the lowcore page.
Unfortunately there is a cut & paste error that puts an additional
"larl %r1,.+14" instruction in the code that clobbers the branch
target address in %r1. Remove the larl instruction.
Cc: <stable@vger.kernel.org> # v4.17+
Fixes: de5cb6eb51 ("s390: use expoline thunks in the BPF JIT")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/net/bpf_jit_comp.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index d2db8acb1a55..9d4399a87fa2 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -485,8 +485,6 @@ static void bpf_jit_epilogue(struct bpf_jit *jit, u32 stack_depth) /* br %r1 */ _EMIT2(0x07f1); } else { - /* larl %r1,.+14 */ - EMIT6_PCREL_RILB(0xc0000000, REG_1, jit->prg + 14); /* ex 0,S390_lowcore.br_r1_tampoline */ EMIT4_DISP(0x44000000, REG_0, REG_0, offsetof(struct lowcore, br_r1_trampoline)); |