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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
This commit is contained in:
Xu Kuohai 2022-03-21 11:28:52 -04:00 committed by Daniel Borkmann
parent f516420f68
commit 38608ee7b6
1 changed files with 30 additions and 0 deletions
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30
lib/test_bpf.c
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@ -14950,6 +14950,36 @@ 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 = {