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bpf: free up BPF_JMP | BPF_CALL | BPF_X opcode

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free up BPF_JMP | BPF_CALL | BPF_X opcode to be used by actual
indirect call by register and use kernel internal opcode to
mark call instruction into bpf_tail_call() helper.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov
2017-05-30 13:31:27 -07:00
committed by David S. Miller
parent d2e0ef493a
commit 71189fa9b0
8 changed files with 10 additions and 7 deletions
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2
arch/x86/net/bpf_jit_comp.c
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@@ -877,7 +877,7 @@ xadd: if (is_imm8(insn->off))
}
break;
case BPF_JMP | BPF_CALL | BPF_X:
case BPF_JMP | BPF_TAIL_CALL:
emit_bpf_tail_call(&prog);
break;