From 38608ee7b6907830f157818d81f7b2393d49c808 Mon Sep 17 00:00:00 2001 From: Xu Kuohai Date: Mon, 21 Mar 2022 11:28:52 -0400 Subject: 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 Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20220321152852.2334294-6-xukuohai@huawei.com --- lib/test_bpf.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) 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 @@ -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 = { -- cgit v1.2.3-59-g8ed1b