From nobody Thu Dec 18 07:56:16 2025 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.3]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 18E89285CBB; Mon, 18 Aug 2025 07:47:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.3 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755503224; cv=none; b=Ki5316OWMxsjv/FnseJXOfRp+ZQ8kgG+Y9lRmyucJ5Zpp5zUjkcPttsDxSgcslqktKL7tg7c5rb3kYu9erZP/zR4RezLWRl/AsjYAnacDqjpFZG/b1JkTjVxJ75GdaczKVOO1pMjXeotxIT2xtIuNjZ50StJhQmvj1Qke6TIyKc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755503224; c=relaxed/simple; bh=g2jUZAuYi24+QU2qGp6Zb96EwojciRbSSB935od7Blk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pbOl3XUBaJqGsAUsf3JwPLx7ER3aF/uNCPhR66JEW2cr++t4wTSFPVESdEatK6vMWbjjL3TM3hiF/wF1uFgr6X6YgOwUN2kBtHRVxdoMfKnoBnfPFoUqyJQifWZUYtpyaMk+4qSTkHIadfrJCzO3Hbcqrnvn46IQe/UK1I3P4Iw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=VGuWfVZs; arc=none smtp.client-ip=117.135.210.3 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="VGuWfVZs" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=c9 qrcvdxKocK0bjalVk19qiGqr1nlSGCxN8y/9RqBP4=; b=VGuWfVZswRrreXIbV3 KHlRJBLqXrn97jnlRqQlXK4A7fygVtFUlm/5PVDAuJlCIo1j7zJPlbz5o4pghVlb m79lZb3a949Uu2wXI2KI7VymDfYdfNGX1y7XjBWWbrdDvQGk1Ka62LM5JBfulfka p8oHdBWRQIDI3lJ+A4Ds7i/tc= Received: from phoenix.. (unknown []) by gzga-smtp-mtada-g0-3 (Coremail) with SMTP id _____wBH_+VZ2qJoyxi9Cg--.52195S4; Mon, 18 Aug 2025 15:46:36 +0800 (CST) From: Jiawei Zhao To: ast@kernel.org Cc: daniel@iogearbox.net, andrii@kernel.org, yonghong.song@linux.dev, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next v11 2/3] selftests/bpf: Add an usdt_o1 test case in selftests to cover SIB handling logic Date: Mon, 18 Aug 2025 07:46:31 +0000 Message-ID: <20250818074632.433008-3-phoenix500526@163.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250818074632.433008-1-phoenix500526@163.com> References: <20250818074632.433008-1-phoenix500526@163.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _____wBH_+VZ2qJoyxi9Cg--.52195S4 X-Coremail-Antispam: 1Uf129KBjvJXoWxWw4ktF4fArWkKr48WFyUJrb_yoWrWFyrpa 48XryFkFWIqF13Kw1Sqr4Uta1rtanayry8AFykXF1avr48WFWxXrn7Kr17tF93J3ykZF1r Aa9xtan8Kr48JF7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07jqeHDUUUUU= X-CM-SenderInfo: pskrv0dl0viiqvswqiywtou0bp/1tbiFB+tiGii08WexQAAsp Content-Type: text/plain; charset="utf-8" When using GCC on x86-64 to compile an usdt prog with -O1 or higher optimization, the compiler will generate SIB addressing mode for global array and PC-relative addressing mode for global variable, e.g. "1@-96(%rbp,%rax,8)" and "-1@4+t1(%rip)". In this patch: - add usdt_o1 test case to cover SIB addressing usdt argument spec handling logic Signed-off-by: Jiawei Zhao --- .../selftests/bpf/prog_tests/usdt_o1.c | 70 +++++++++++++++++++ .../selftests/bpf/progs/test_usdt_o1.c | 37 ++++++++++ 2 files changed, 107 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/usdt_o1.c create mode 100644 tools/testing/selftests/bpf/progs/test_usdt_o1.c diff --git a/tools/testing/selftests/bpf/prog_tests/usdt_o1.c b/tools/testi= ng/selftests/bpf/prog_tests/usdt_o1.c new file mode 100644 index 000000000000..706168e804cb --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/usdt_o1.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 Jiawei Zhao . */ +#include + +#include "../sdt.h" +#include "test_usdt_o1.skel.h" + +#if (defined(__GNUC__) && !defined(__clang__)) +#pragma GCC optimize("O1") +#else +#pragma message("non-gcc compiler: the correct probes might not be install= ed") +#endif + + +#define test_value 0xFEDCBA9876543210ULL +#define SEC(name) __attribute__((section(name), used)) + +int lets_test_this(int); +static volatile __u64 array[1] =3D {test_value}; + +static __always_inline void trigger_func(void) +{ + /* Base address + offset + (index * scale) */ + for (volatile int i =3D 0; i <=3D 0; i++) + STAP_PROBE1(test, usdt1, array[i]); +} + +static void basic_sib_usdt(void) +{ + LIBBPF_OPTS(bpf_usdt_opts, opts); + struct test_usdt_o1 *skel; + struct test_usdt_o1__bss *bss; + int err; + + skel =3D test_usdt_o1__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return; + + bss =3D skel->bss; + bss->my_pid =3D getpid(); + + err =3D test_usdt_o1__attach(skel); + if (!ASSERT_OK(err, "skel_attach")) + goto cleanup; + + /* usdt1 won't be auto-attached */ + opts.usdt_cookie =3D 0xcafedeadbeeffeed; + skel->links.usdt1 =3D bpf_program__attach_usdt(skel->progs.usdt1, + 0 /*self*/, "/proc/self/exe", + "test", "usdt1", &opts); + if (!ASSERT_OK_PTR(skel->links.usdt1, "usdt1_link")) + goto cleanup; + + trigger_func(); + + ASSERT_EQ(bss->usdt1_called, 1, "usdt1_called"); + ASSERT_EQ(bss->usdt1_cookie, 0xcafedeadbeeffeed, "usdt1_cookie"); + ASSERT_EQ(bss->usdt1_arg_cnt, 1, "usdt1_arg_cnt"); + ASSERT_EQ(bss->usdt1_arg, test_value, "usdt1_arg"); + ASSERT_EQ(bss->usdt1_arg_ret, 0, "usdt1_arg_ret"); + ASSERT_EQ(bss->usdt1_arg_size, sizeof(array[0]), "usdt1_arg_size"); + +cleanup: + test_usdt_o1__destroy(skel); +} + +void test_usdt_o1(void) +{ + basic_sib_usdt(); +} diff --git a/tools/testing/selftests/bpf/progs/test_usdt_o1.c b/tools/testi= ng/selftests/bpf/progs/test_usdt_o1.c new file mode 100644 index 000000000000..14602aa54578 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_usdt_o1.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ + +#include "vmlinux.h" +#include +#include + +int my_pid; + +int usdt1_called; +u64 usdt1_cookie; +int usdt1_arg_cnt; +int usdt1_arg_ret; +u64 usdt1_arg; +int usdt1_arg_size; + +SEC("usdt") +int usdt1(struct pt_regs *ctx) +{ + long tmp; + + if (my_pid !=3D (bpf_get_current_pid_tgid() >> 32)) + return 0; + + __sync_fetch_and_add(&usdt1_called, 1); + + usdt1_cookie =3D bpf_usdt_cookie(ctx); + usdt1_arg_cnt =3D bpf_usdt_arg_cnt(ctx); + + usdt1_arg_ret =3D bpf_usdt_arg(ctx, 0, &tmp); + usdt1_arg =3D (u64)tmp; + usdt1_arg_size =3D bpf_usdt_arg_size(ctx, 0); + + return 0; +} + +char _license[] SEC("license") =3D "GPL"; --=20 2.43.0