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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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2012-12-01 12:42:32 +01:00 committed by Martin Schwidefsky
parent 3247274536
commit 916908df24
1 changed files with 7 additions and 0 deletions
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7
arch/s390/net/bpf_jit_comp.c
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@ -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) */