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bpf, tests: Add load store test case for tail call

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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 <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
This commit is contained in:
Xu Kuohai authored and Daniel Borkmann committed 2022-04-01 00:27:52 +02:00
1 parent f516420f68
commit 38608ee7b6
1 file changed
+30
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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 = {