netdev - [PATCH net-next] test_bpf: Add backward jump test case

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Message-Id: <1432309000-11545-1-git-send-email-ast@plumgrid.com>
Date:	Fri, 22 May 2015 08:36:40 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org
Subject: [PATCH net-next] test_bpf: Add backward jump test case

From: Michael Holzheu <holzheu@...ux.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 <holzheu@...ux.vnet.ibm.com>
Signed-off-by: Alexei Starovoitov <ast@...mgrid.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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