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Commit 82c93fcc authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

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: default avatarDaniel Borkmann <daniel.borkmann@tik.ee.ethz.ch>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9e49e889

arch/x86/net/bpf_jit_comp.c

+9 −0
Original line number Diff line number Diff line
@@ -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 */