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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-12-01 12:29:08 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-12-03 10:44:02 -0500
commit3247274536729b6cc23208cc087e50fdef3de6ba (patch)
tree6d6bc563256dc2c1d74be2dad2a2f63bad5c73ac /arch/s390/net
parentd99e79ec5574fc556c988f613ed6175f6de66f4a (diff)
downloadlinux-3247274536729b6cc23208cc087e50fdef3de6ba.tar.gz
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>
Diffstat (limited to 'arch/s390/net')
-rw-r--r--arch/s390/net/bpf_jit_comp.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 9b355b406afa..1ff930167348 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -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 */