[PATCH v2 bpf-next 3/7] s390: bpf: implement jitting of BPF_ALU | BPF_ARSH | BPF_*
From: Jiong Wang <hidden>
Date: 2018-12-05 18:53:20
Subsystem:
bpf jit for s390, bpf [general] (safe dynamic programs and tools), s390 architecture, the rest · Maintainers:
Ilya Leoshkevich, Heiko Carstens, Vasily Gorbik, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Alexander Gordeev, Linus Torvalds
This patch implements code-gen for BPF_ALU | BPF_ARSH | BPF_*. Cc: Martin Schwidefsky <redacted> Cc: Heiko Carstens <redacted> Signed-off-by: Jiong Wang <redacted> --- arch/s390/net/bpf_jit_comp.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index d7052cb..3ff758e 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c@@ -821,10 +821,22 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, int i /* * BPF_ARSH */ + case BPF_ALU | BPF_ARSH | BPF_X: /* ((s32) dst) >>= src */ + /* sra %dst,%dst,0(%src) */ + EMIT4_DISP(0x8a000000, dst_reg, src_reg, 0); + EMIT_ZERO(dst_reg); + break; case BPF_ALU64 | BPF_ARSH | BPF_X: /* ((s64) dst) >>= src */ /* srag %dst,%dst,0(%src) */ EMIT6_DISP_LH(0xeb000000, 0x000a, dst_reg, dst_reg, src_reg, 0); break; + case BPF_ALU | BPF_ARSH | BPF_K: /* ((s32) dst >> imm */ + if (imm == 0) + break; + /* sra %dst,imm(%r0) */ + EMIT4_DISP(0x8a000000, dst_reg, REG_0, imm); + EMIT_ZERO(dst_reg); + break; case BPF_ALU64 | BPF_ARSH | BPF_K: /* ((s64) dst) >>= imm */ if (imm == 0) break;
--
2.7.4