From: Michael Holzheu <holz...@linux.vnet.ibm.com>
Currently the testsuite does not have a test case with a backward jump.
The s390x JIT (kernel 4.0) had a bug in that area.
So add one new test case for this now.
Signed-off-by: Michael Holzheu <holz...@linux.vnet.ibm.com>
Signed-off-by: Alexei Starovoitov <a...@plumgrid.com>
---
lib/test_bpf.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index aaa0a40a7eb3..9b012a811ee1 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -3940,6 +3940,22 @@ static struct bpf_test tests[] = {
{ },
{ { 0, 1 } },
},
+ /* BPF_JMP | BPF_JGT | BPF_K jump backwards */
+ {
+ "JMP_JGT_K: if (3 > 2) return 1 (jump backwards)",
+ .u.insns_int = {
+ BPF_JMP_IMM(BPF_JA, 0, 0, 2), /* goto start */
+ BPF_ALU32_IMM(BPF_MOV, R0, 1), /* out: */
+ BPF_EXIT_INSN(),
+ BPF_ALU32_IMM(BPF_MOV, R0, 0), /* start: */
+ BPF_LD_IMM64(R1, 3), /* note: this takes 2 insns */
+ BPF_JMP_IMM(BPF_JGT, R1, 2, -6), /* goto out */
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 1 } },
+ },
{
"JMP_JGE_K: if (3 >= 3) return 1",
.u.insns_int = {
--
1.7.9.5
--
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