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bpf, tests: Add test for 32-bit context pointer argument passing 

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>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210809091829.810076-12-johan.almbladh@anyfinetworks.com
This commit is contained in:
Johan Almbladh 2021-08-09 11:18:26 +02:00 committed by Daniel Borkmann
parent 66e5eb8474
commit 53e33f9928
1 changed files with 16 additions and 0 deletions
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16
lib/test_bpf.c
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@ -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 = {