netdev - [PATCH net-next] x86 bpf_jit: support BPF_S_ANC_ALU_XOR

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Message-ID: <1338881190.2760.1992.camel@edumazet-glaptop>
Date:	Tue, 05 Jun 2012 09:26:30 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>, Jiri Pirko <jpirko@...hat.com>
Subject: [PATCH net-next] x86 bpf_jit: support BPF_S_ANC_ALU_XOR_X
 instruction

From: Eric Dumazet <edumazet@...gle.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@...gle.com>
Cc: Jiri Pirko <jpirko@...hat.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 */


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