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s390/bpf,jit: add support MOD instruction 

Add support for MOD operation for s390's JIT.

Same as 280050cc "x86 bpf_jit: support MOD operation" for x86 which
adds JIT support for the generic new MOD operation introduced with
b6069a9570 "filter: add MOD operation".

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 12:29:08 +01:00 committed by Martin Schwidefsky
parent d99e79ec55
commit 3247274536
1 changed files with 21 additions and 0 deletions
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21
arch/s390/net/bpf_jit_comp.c
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@ -341,6 +341,27 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter,
/* lr %r5,%r4 */
EMIT2(0x1854);
break;
case BPF_S_ALU_MOD_X: /* A %= X */
jit->seen |= SEEN_XREG | SEEN_RET0;
/* ltr %r12,%r12 */
EMIT2(0x12cc);
/* jz <ret0> */
EMIT4_PCREL(0xa7840000, (jit->ret0_ip - jit->prg));
/* lhi %r4,0 */
EMIT4(0xa7480000);
/* dr %r4,%r12 */
EMIT2(0x1d4c);
/* lr %r5,%r4 */
EMIT2(0x1854);
break;
case BPF_S_ALU_MOD_K: /* A %= K */
/* lhi %r4,0 */
EMIT4(0xa7480000);
/* d %r4,<d(K)>(%r13) */
EMIT4_DISP(0x5d40d000, EMIT_CONST(K));
/* lr %r5,%r4 */
EMIT2(0x1854);
break;
case BPF_S_ALU_AND_X: /* A &= X */
jit->seen |= SEEN_XREG;
/* nr %r5,%r12 */