From: Alexei Starovoitov <ast@plumgrid.com>
Date: Tue, 23 Sep 2014 21:36:11 +0000 (-0700)
Subject: sparc: bpf_jit: add support for BPF_LD(X) | BPF_LEN instructions
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=cec08315190a4461a369d47041a510d104a5d2a2;p=openwrt%2Fstaging%2Fblogic.git

sparc: bpf_jit: add support for BPF_LD(X) | BPF_LEN instructions

BPF_LD | BPF_W | BPF_LEN instruction is occasionally used by tcpdump
and present in 11 tests in lib/test_bpf.c
Teach sparc JIT compiler to emit it.

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/sparc/net/bpf_jit_comp.c b/arch/sparc/net/bpf_jit_comp.c
index c1c60c32f6dd..f33e7c7a3bf7 100644
--- a/arch/sparc/net/bpf_jit_comp.c
+++ b/arch/sparc/net/bpf_jit_comp.c
@@ -624,7 +624,12 @@ void bpf_jit_compile(struct bpf_prog *fp)
 					emit_and(r_A, r_TMP, r_A);
 				}
 				break;
-
+			case BPF_LD | BPF_W | BPF_LEN:
+				emit_skb_load32(len, r_A);
+				break;
+			case BPF_LDX | BPF_W | BPF_LEN:
+				emit_skb_load32(len, r_X);
+				break;
 			case BPF_LD | BPF_IMM:
 				emit_loadimm(K, r_A);
 				break;