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Date: Mon, 24 Sep 2012 19:34:51 +0200 From: Daniel Borkmann <dxchgb@...il.com> To: davem@...emloft.net Cc: eric.dumazet@...il.com, netdev@...r.kernel.org Subject: [PATCH net-next] x86: bpf_jit_comp: add XOR instruction for BPF JIT This patch is a follow-up for patch "filter: add XOR instruction for use with X/K" that implements BPF x86 JIT parts for the BPF XOR operation. Signed-off-by: Daniel Borkmann <daniel.borkmann@....ee.ethz.ch> --- arch/x86/net/bpf_jit_comp.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index 106c578..520d2bd 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -335,9 +335,18 @@ void bpf_jit_compile(struct sk_filter *fp) EMIT1_off32(0x0d, K); /* or imm32,%eax */ break; case BPF_S_ANC_ALU_XOR_X: /* A ^= X; */ + case BPF_S_ALU_XOR_X: seen |= SEEN_XREG; EMIT2(0x31, 0xd8); /* xor %ebx,%eax */ break; + case BPF_S_ALU_XOR_K: /* A ^= K; */ + if (K == 0) + break; + if (is_imm8(K)) + EMIT3(0x83, 0xf0, K); /* xor imm8,%eax */ + else + EMIT1_off32(0x35, K); /* xor imm32,%eax */ + break; case BPF_S_ALU_LSH_X: /* A <<= X; */ seen |= SEEN_XREG; EMIT4(0x89, 0xd9, 0xd3, 0xe0); /* mov %ebx,%ecx; shl %cl,%eax */ -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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