Commit 4bfaddf1 authored Jun 04, 2012 by Eric Dumazet Committed by David S. Miller Jun 06, 2012

x86 bpf_jit: support BPF_S_ANC_ALU_XOR_X instruction



commit ffe06c17  (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>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c2fd03a0

arch/x86/net/bpf_jit_comp.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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 */