netdev - [RFC PATCH 11/14] bpf/tests: add test for 32-bit context pointer argument passing

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Message-Id: <20210726081738.1833704-12-johan.almbladh@anyfinetworks.com>
Date:   Mon, 26 Jul 2021 10:17:35 +0200
From:   Johan Almbladh <johan.almbladh@...finetworks.com>
To:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org
Cc:     kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        Tony.Ambardar@...il.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org,
        Johan Almbladh <johan.almbladh@...finetworks.com>
Subject: [RFC PATCH 11/14] bpf/tests: add test for 32-bit context pointer argument passing

On a 32-bit architecture, the context pointer should occupy the low
half of R0, and the other half should be zero.

Signed-off-by: Johan Almbladh <johan.almbladh@...finetworks.com>
---
 lib/test_bpf.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 55914b6236aa..314af6eaeb92 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -2084,6 +2084,22 @@ static struct bpf_test tests[] = {
 #undef NUMER
 #undef DENOM
 	},
+#ifdef CONFIG_32BIT
+	{
+		"INT: 32-bit context pointer word order and zero-extension",
+		.u.insns_int = {
+			BPF_ALU32_IMM(BPF_MOV, R0, 0),
+			BPF_JMP32_IMM(BPF_JEQ, R1, 0, 3),
+			BPF_ALU64_IMM(BPF_RSH, R1, 32),
+			BPF_JMP32_IMM(BPF_JNE, R1, 0, 1),
+			BPF_ALU32_IMM(BPF_MOV, R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 1 } }
+	},
+#endif
 	{
 		"check: missing ret",
 		.u.insns = {
-- 
2.25.1