diff mbox series

[bpf-next,v2,11/14] bpf/tests: Add test for 32-bit context pointer argument passing

Message ID 20210809091829.810076-12-johan.almbladh@anyfinetworks.com
State New
Headers show
Series bpf/tests: Extend the eBPF test suite | expand

Commit Message

Johan Almbladh Aug. 9, 2021, 9:18 a.m. UTC 
On a 32-bit architecture, the context pointer will occupy the low
half of R1, and the other half will be zero.

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

diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 896d37f4f4b3..fcfaf45ae58a 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -2092,6 +2092,22 @@  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 = {