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>
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 @@
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 */