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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2015-01-08 14:36:21 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-01-09 10:10:30 +0100
commitdf3eed3d282f2fe1ffb73d3545fcde4e9b80a0d3 (patch)
tree26b328857f004c83f45eb3a5af446ead0dbc973c /arch/s390/net
parentfbc89c952f004fb9191c23605a1428df6dd39a90 (diff)
s390/bpf: Fix ALU_NEG (A = -A)
Currently the LOAD NEGATIVE (lnr) instruction is used for ALU_NEG. This instruction always loads the negative value. Therefore, if A is already negative, it remains unchanged. To fix this use LOAD COMPLEMENT (lcr) instead. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.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.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index c52ac77408ca..8bc474fb52fd 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -431,8 +431,8 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter,
EMIT4_DISP(0x88500000, K);
break;
case BPF_ALU | BPF_NEG: /* A = -A */
- /* lnr %r5,%r5 */
- EMIT2(0x1155);
+ /* lcr %r5,%r5 */
+ EMIT2(0x1355);
break;
case BPF_JMP | BPF_JA: /* ip += K */
offset = addrs[i + K] + jit->start - jit->prg;