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| author | Xu Kuohai <xukuohai@huawei.com> | 2022-03-21 11:28:52 -0400 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-04-01 00:27:52 +0200 |
| commit | 38608ee7b6907830f157818d81f7b2393d49c808 (patch) | |
| tree | 1e542b27950443772b7134876a5251022498480f /lib/test_bpf.c | |
| parent | f516420f683d147d8f4cfd83bbc7c3c6ad1c61b5 (diff) | |
| download | lwn-38608ee7b6907830f157818d81f7b2393d49c808.tar.gz lwn-38608ee7b6907830f157818d81f7b2393d49c808.zip | |
bpf, tests: Add load store test case for tail call
Add test case to enusre that the caller and callee's fp offsets are
correct during tail call (mainly asserting for arm64 JIT).
Tested on both big-endian and little-endian arm64 qemu, result:
test_bpf: Summary: 1026 PASSED, 0 FAILED, [1014/1014 JIT'ed]
test_bpf: test_tail_calls: Summary: 10 PASSED, 0 FAILED, [10/10 JIT'ed]
test_bpf: test_skb_segment: Summary: 2 PASSED, 0 FAILED
Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220321152852.2334294-6-xukuohai@huawei.com
Diffstat (limited to 'lib/test_bpf.c')
| -rw-r--r-- | lib/test_bpf.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/lib/test_bpf.c b/lib/test_bpf.c index aa0c7c68b2be..2a7836e115b4 100644 --- a/lib/test_bpf.c +++ b/lib/test_bpf.c @@ -14951,6 +14951,36 @@ static struct tail_call_test tail_call_tests[] = { .result = 10, }, { + "Tail call load/store leaf", + .insns = { + BPF_ALU64_IMM(BPF_MOV, R1, 1), + BPF_ALU64_IMM(BPF_MOV, R2, 2), + BPF_ALU64_REG(BPF_MOV, R3, BPF_REG_FP), + BPF_STX_MEM(BPF_DW, R3, R1, -8), + BPF_STX_MEM(BPF_DW, R3, R2, -16), + BPF_LDX_MEM(BPF_DW, R0, BPF_REG_FP, -8), + BPF_JMP_REG(BPF_JNE, R0, R1, 3), + BPF_LDX_MEM(BPF_DW, R0, BPF_REG_FP, -16), + BPF_JMP_REG(BPF_JNE, R0, R2, 1), + BPF_ALU64_IMM(BPF_MOV, R0, 0), + BPF_EXIT_INSN(), + }, + .result = 0, + .stack_depth = 32, + }, + { + "Tail call load/store", + .insns = { + BPF_ALU64_IMM(BPF_MOV, R0, 3), + BPF_STX_MEM(BPF_DW, BPF_REG_FP, R0, -8), + TAIL_CALL(-1), + BPF_ALU64_IMM(BPF_MOV, R0, -1), + BPF_EXIT_INSN(), + }, + .result = 0, + .stack_depth = 16, + }, + { "Tail call error path, max count reached", .insns = { BPF_LDX_MEM(BPF_W, R2, R1, 0), |