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| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2020-06-02 19:45:55 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2020-06-02 21:04:04 +0200 |
| commit | 33d21f18204cb33b43ca6c78c8180949f6dc7227 (patch) | |
| tree | 8f04f223a9c990e9cd2c829f9b3d06b62da152ce | |
| parent | effe5be17706167ee968fa28afe40dec9c6f71db (diff) | |
| download | linux-33d21f18204cb33b43ca6c78c8180949f6dc7227.tar.gz linux-33d21f18204cb33b43ca6c78c8180949f6dc7227.tar.bz2 linux-33d21f18204cb33b43ca6c78c8180949f6dc7227.zip | |
s390/bpf: Use bcr 0,%0 as tail call nop filler
Currently used 0x0000 filler confuses bfd disassembler, making bpftool
prog dump xlated output nearly useless. Fix by using a real instruction.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200602174555.2501389-1-iii@linux.ibm.com
| -rw-r--r-- | arch/s390/net/bpf_jit_comp.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index 0f37a1b635f8..f4242b894cf2 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -503,7 +503,8 @@ static void bpf_jit_prologue(struct bpf_jit *jit, u32 stack_depth) } else { /* j tail_call_start: NOP if no tail calls are used */ EMIT4_PCREL(0xa7f40000, 6); - _EMIT2(0); + /* bcr 0,%0 */ + EMIT2(0x0700, 0, REG_0); } /* Tail calls have to skip above initialization */ jit->tail_call_start = jit->prg; |