From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: netdev <netdev@vger.kernel.org>, Jiri Pirko <jpirko@redhat.com>
Subject: [PATCH net-next] x86 bpf_jit: support BPF_S_ANC_ALU_XOR_X instruction
Date: Tue, 05 Jun 2012 09:26:30 +0200 [thread overview]
Message-ID: <1338881190.2760.1992.camel@edumazet-glaptop> (raw)
From: Eric Dumazet <edumazet@google.com>
commit ffe06c17afbb (filter: add XOR operation) added generic support
for XOR operation.
This patch implements the XOR instruction in x86 jit.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jiri Pirko <jpirko@redhat.com>
---
arch/x86/net/bpf_jit_comp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 0597f95..2cf6ce3 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -309,6 +309,10 @@ void bpf_jit_compile(struct sk_filter *fp)
else
EMIT1_off32(0x0d, K); /* or imm32,%eax */
break;
+ case BPF_S_ANC_ALU_XOR_X: /* A ^= X; */
+ seen |= SEEN_XREG;
+ EMIT2(0x31, 0xd8); /* xor %ebx,%eax */
+ break;
case BPF_S_ALU_LSH_X: /* A <<= X; */
seen |= SEEN_XREG;
EMIT4(0x89, 0xd9, 0xd3, 0xe0); /* mov %ebx,%ecx; shl %cl,%eax */
next reply other threads:[~2012-06-05 7:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-05 7:26 Eric Dumazet [this message]
2012-06-06 16:44 ` [PATCH net-next] x86 bpf_jit: support BPF_S_ANC_ALU_XOR_X instruction David Miller
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