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>
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@ -485,8 +485,6 @@ static void bpf_jit_epilogue(struct bpf_jit *jit, u32 stack_depth)
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/* br %r1 */
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_EMIT2(0x07f1);
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} else {
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/* larl %r1,.+14 */
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EMIT6_PCREL_RILB(0xc0000000, REG_1, jit->prg + 14);
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/* ex 0,S390_lowcore.br_r1_tampoline */
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EMIT4_DISP(0x44000000, REG_0, REG_0,
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offsetof(struct lowcore, br_r1_trampoline));
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