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(unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wDnD0ZrH5NoufpdAA--.11721S4; Wed, 06 Aug 2025 17:25:03 +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 v7 2/2] selftests/bpf: Force -O2 for USDT selftests to cover SIB handling logic Date: Wed, 6 Aug 2025 09:24:58 +0000 Message-ID: <20250806092458.111972-3-phoenix500526@163.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250806092458.111972-1-phoenix500526@163.com> References: <20250806092458.111972-1-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: _____wDnD0ZrH5NoufpdAA--.11721S4 X-Coremail-Antispam: 1Uf129KBjvJXoWxKF15CryUAFWrXry5CF43GFg_yoW7Gw1xpa 48Xw1YkrWIqF43Kr1SqF4Utr4rKanayrW8JFykXFyavr48JF92qr1xKry7Kas3G395XF1r A39xtan8Gr48Jw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07jzUDJUUUUU= X-CM-SenderInfo: pskrv0dl0viiqvswqiywtou0bp/xtbBaxChiGiTHQJCqwAAsf 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_o2 test case to cover SIB addressing usdt argument spec handling logic Signed-off-by: Jiawei Zhao --- tools/testing/selftests/bpf/Makefile | 8 +++ .../selftests/bpf/prog_tests/usdt_o2.c | 71 +++++++++++++++++++ .../selftests/bpf/progs/test_usdt_o2.c | 37 ++++++++++ 3 files changed, 116 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/usdt_o2.c create mode 100644 tools/testing/selftests/bpf/progs/test_usdt_o2.c diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests= /bpf/Makefile index 910d8d6402ef..68cf6a9cf05f 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -759,6 +759,14 @@ TRUNNER_BPF_BUILD_RULE :=3D $$(error no BPF objects sh= ould be built) TRUNNER_BPF_CFLAGS :=3D $(eval $(call DEFINE_TEST_RUNNER,test_maps)) =20 +# Use -O2 optimization to generate SIB addressing usdt argument spec +# Only apply on x86 architecture where SIB addressing is relevant +ifeq ($(ARCH), x86) +$(OUTPUT)/usdt_o2.test.o: CFLAGS:=3D$(subst O0,O2,$(CFLAGS)) +$(OUTPUT)/cpuv4/usdt_o2.test.o: CFLAGS:=3D$(subst O0,O2,$(CFLAGS)) +$(OUTPUT)/no_alu32/usdt_o2.test.o: CFLAGS:=3D$(subst O0,O2,$(CFLAGS)) +endif + # Define test_verifier test runner. # It is much simpler than test_maps/test_progs and sufficiently different = from # them (e.g., test.h is using completely pattern), that it's worth just diff --git a/tools/testing/selftests/bpf/prog_tests/usdt_o2.c b/tools/testi= ng/selftests/bpf/prog_tests/usdt_o2.c new file mode 100644 index 000000000000..f04b756b3640 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/usdt_o2.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 Jiawei Zhao . */ +#include + +#define _SDT_HAS_SEMAPHORES 1 +#include "../sdt.h" +#include "test_usdt_o2.skel.h" + +int lets_test_this(int); + +#define test_value 0xFEDCBA9876543210ULL +#define SEC(name) __attribute__((section(name), used)) + + +static volatile __u64 array[1] =3D {test_value}; +unsigned short test_usdt1_semaphore SEC(".probes"); + +static __always_inline void trigger_func(void) +{ + /* Base address + offset + (index * scale) */ + if (test_usdt1_semaphore) { + 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_o2 *skel; + struct test_usdt_o2__bss *bss; + int err; + + skel =3D test_usdt_o2__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return; + + bss =3D skel->bss; + bss->my_pid =3D getpid(); + + err =3D test_usdt_o2__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_o2__destroy(skel); +} + + + +void test_usdt_o2(void) +{ + basic_sib_usdt(); +} diff --git a/tools/testing/selftests/bpf/progs/test_usdt_o2.c b/tools/testi= ng/selftests/bpf/progs/test_usdt_o2.c new file mode 100644 index 000000000000..14602aa54578 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_usdt_o2.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