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Date: Tue, 28 Jul 2020 08:44:23 -0700 From: John Fastabend <john.fastabend@...il.com> To: john.fastabend@...il.com, kafai@...com, daniel@...earbox.net, ast@...nel.org Cc: netdev@...r.kernel.org, bpf@...r.kernel.org Subject: [bpf PATCH 3/3] bpf, selftests: Add tests for sock_ops load with r9, r8.r7 registers Loads in sock_ops case when using high registers requires extra logic to ensure the correct temporary value is used. Lets add an asm test to force the logic is triggered. The xlated code for the load, 30: (7b) *(u64 *)(r9 +32) = r7 31: (61) r7 = *(u32 *)(r9 +28) 32: (15) if r7 == 0x0 goto pc+2 33: (79) r7 = *(u64 *)(r9 +0) 34: (63) *(u32 *)(r7 +916) = r8 35: (79) r7 = *(u64 *)(r9 +32) Signed-off-by: John Fastabend <john.fastabend@...il.com> --- .../testing/selftests/bpf/progs/test_tcpbpf_kern.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c b/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c index f8b13682..6420b61 100644 --- a/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c +++ b/tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c @@ -75,6 +75,13 @@ int bpf_testcb(struct bpf_sock_ops *skops) : [skops] "r"(skops) :); + asm volatile ( + "r9 = %[skops];\n" + "r8 = *(u32 *)(r9 +164);\n" + "*(u32 *)(r9 +164) = r8;\n" + :: [skops] "r"(skops) + : "r9", "r8"); + op = (int) skops->op; update_event_map(op);
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