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Commit 916908df authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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s390/bpf,jit: add support for XOR instruction 



Add support for XOR instruction for use with X/K.

s390 JIT support for the new BPF_S_ALU_XOR_* instructions introduced
with 9e49e889 "filter: add XOR instruction for use with X/K".

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 32472745

arch/s390/net/bpf_jit_comp.c

+7 −0
Original line number Diff line number Diff line
@@ -389,10 +389,17 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter, 
			EMIT4_DISP(0x5650d000, EMIT_CONST(K));

		break;

	case BPF_S_ANC_ALU_XOR_X: /* A ^= X; */

	case BPF_S_ALU_XOR_X:

		jit->seen |= SEEN_XREG;

		/* xr %r5,%r12 */

		EMIT2(0x175c);

		break;

	case BPF_S_ALU_XOR_K: /* A ^= K */

		if (!K)

			break;

		/* x %r5,<d(K)>(%r13) */

		EMIT4_DISP(0x5750d000, EMIT_CONST(K));

		break;

	case BPF_S_ALU_LSH_X: /* A <<= X; */

		jit->seen |= SEEN_XREG;

		/* sll %r5,0(%r12) */