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authorDaniel Borkmann <dxchgb@gmail.com>2012-09-24 07:34:51 +0000
committerDavid S. Miller <davem@davemloft.net>2012-09-24 16:54:35 -0400
commit82c93fcc2e1737fede2752520f1bf8f4de6304d8 (patch)
tree857ae8ecf17d178f5e2225aded80a1779837467a /arch/x86/net
parent9e49e88958feb41ec701fa34b44723dabadbc28c (diff)
downloadop-kernel-dev-82c93fcc2e1737fede2752520f1bf8f4de6304d8.zip
op-kernel-dev-82c93fcc2e1737fede2752520f1bf8f4de6304d8.tar.gz
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@tik.ee.ethz.ch> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/x86/net')
-rw-r--r--arch/x86/net/bpf_jit_comp.c9
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 */
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