summaryrefslogtreecommitdiff
path: root/arch/s390
diff options
context:
space:
mode:
authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2015-01-14 10:25:07 (GMT)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-01-15 07:17:42 (GMT)
commit5a80244246d503df688341a10e1d244d15bb8ce5 (patch)
treee4e39440f18e35b8710b7c515daaba11cbbacabf /arch/s390
parentf800c25b7a762d445ba1439a2428c8362157eba6 (diff)
downloadlinux-5a80244246d503df688341a10e1d244d15bb8ce5.tar.xz
s390/bpf: Fix JMP_JGE_K (A >= K) and JMP_JGT_K (A > K)
Currently the signed COMPARE HALFWORD IMMEDIATE (chi) and COMPARE (c) instructions are used to compare "A" with "K". This is not correct because "A" and "K" are both unsigned. To fix this remove the chi instruction (no unsigned analogon available) and use the unsigned COMPARE LOGICAL (cl) instruction instead of COMPARE (c). Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/net/bpf_jit_comp.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 524496d..bbd1981 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -448,15 +448,12 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter,
mask = 0x800000; /* je */
kbranch: /* Emit compare if the branch targets are different */
if (filter->jt != filter->jf) {
- if (K <= 16383)
- /* chi %r5,<K> */
- EMIT4_IMM(0xa75e0000, K);
- else if (test_facility(21))
+ if (test_facility(21))
/* clfi %r5,<K> */
EMIT6_IMM(0xc25f0000, K);
else
- /* c %r5,<d(K)>(%r13) */
- EMIT4_DISP(0x5950d000, EMIT_CONST(K));
+ /* cl %r5,<d(K)>(%r13) */
+ EMIT4_DISP(0x5550d000, EMIT_CONST(K));
}
branch: if (filter->jt == filter->jf) {
if (filter->jt == 0)