From nobody Tue Dec 2 03:00:13 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D7DFD331A7D; Mon, 17 Nov 2025 12:42:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763383336; cv=none; b=aJZovIw89RNHbnlS6IsaZWQe95FXC36VDGgGWl/SMAR05WzU/RNcgaU3YXcg4GyX9frKV++5ybAblfwrrrmkfYyAuXMF4oDxTGJUXeOhblOh1XRtDIomKvquc+1l+VrOXpDhWdSF18y3N2D2tcNI3wFpoqGJhCM3WADyJ5agnqM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763383336; c=relaxed/simple; bh=x6+UjMw+bXbFJFqVCo4FzgPK65NoY/tAW0D2C8W9Rq0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BiawTbPP5zY1BjkxZ+EbcQJDwZ0y/ubfgAR/I6NHQa5tnvEAq+O33arx51Bom6jRlIAcH3JRtBtSavH+sk0O9Ud5kUdUsDgqctjQ4Ozvc/JFI33ghDKuAzlTZ/ak16qlAm5lFrq0Qa3yqVXVYroJ1/5ECT/QTk8SpC+Ool5g1As= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ere/j32l; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ere/j32l" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F3C3BC4CEFB; Mon, 17 Nov 2025 12:42:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763383336; bh=x6+UjMw+bXbFJFqVCo4FzgPK65NoY/tAW0D2C8W9Rq0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ere/j32l6mc/RYI/bbNiqAEQStc6TQs9PA2CuhKAx42TorQ8itmmTC25qMMOhAmpo fS/S48HgnrpIJ5yFtPiIkrIyfwjAh6qr3OCg6k2YeSawZUTdhfk10HTcDTrccEEdp5 S/XwWgJkQ9Ue4DNz30Ecr8k7tha/7y/wULfzctv2Kmr9qZvVs+sqF7kXKDMHLBcgnl EnhlhjOfbulso0PPJy+qvOxxDMFU4myjm0G64aZKo5jpu9F1Ef8jH03qtsWFEFu0MO lD3jRnhAUXnSw6kRhDEukWE0lbYKmIklHzMTBiPEGAwTOfYC1S59wVTTrKPCZtQXFh JE7cxV3P45HCw== From: Jiri Olsa To: Oleg Nesterov , Masami Hiramatsu , Peter Zijlstra , Andrii Nakryiko Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Song Liu , Yonghong Song , John Fastabend , Steven Rostedt , Ingo Molnar , David Laight Subject: [RFC PATCH 6/8] selftests/bpf: Add test for mov and sub emulation Date: Mon, 17 Nov 2025 13:40:55 +0100 Message-ID: <20251117124057.687384-7-jolsa@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251117124057.687384-1-jolsa@kernel.org> References: <20251117124057.687384-1-jolsa@kernel.org> 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 Content-Type: text/plain; charset="utf-8" Adding test code for mov and sub instructions emulation. TODO add test for sub flags value emulation. Signed-off-by: Jiri Olsa --- .../selftests/bpf/prog_tests/uprobe_syscall.c | 50 +++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c b/tool= s/testing/selftests/bpf/prog_tests/uprobe_syscall.c index 955a37751b52..27fa6f309188 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c @@ -765,6 +765,54 @@ static void test_uprobe_error(void) ASSERT_EQ(errno, ENXIO, "errno"); } =20 +__attribute__((aligned(16))) +__nocf_check __weak __naked unsigned long emulate_mov_trigger(void) +{ + asm volatile ( + "pushq %rbp\n" + "movq %rsp,%rbp\n" + "subq $0xb0,%rsp\n" + "addq $0xb0,%rsp\n" + "pop %rbp\n" + "ret\n" + ); +} + +static void test_emulate(void) +{ + struct uprobe_syscall *skel =3D NULL; + unsigned long offset; + + offset =3D get_uprobe_offset(&emulate_mov_trigger); + if (!ASSERT_GE(offset, 0, "get_uprobe_offset")) + return; + + skel =3D uprobe_syscall__open_and_load(); + if (!ASSERT_OK_PTR(skel, "uprobe_syscall__open_and_load")) + goto cleanup; + + /* mov */ + skel->links.probe =3D bpf_program__attach_uprobe_opts(skel->progs.probe, + 0, "/proc/self/exe", offset + 1, NULL); + if (!ASSERT_OK_PTR(skel->links.probe, "bpf_program__attach_uprobe_opts")) + goto cleanup; + + emulate_mov_trigger(); + + bpf_link__destroy(skel->links.probe); + + /* sub */ + skel->links.probe =3D bpf_program__attach_uprobe_opts(skel->progs.probe, + 0, "/proc/self/exe", offset + 4, NULL); + if (!ASSERT_OK_PTR(skel->links.probe, "bpf_program__attach_uprobe_opts")) + goto cleanup; + + emulate_mov_trigger(); + +cleanup: + uprobe_syscall__destroy(skel); +} + static void __test_uprobe_syscall(void) { if (test__start_subtest("uretprobe_regs_equal")) @@ -789,6 +837,8 @@ static void __test_uprobe_syscall(void) test_uprobe_regs_equal(false); if (test__start_subtest("regs_change")) test_regs_change(); + if (test__start_subtest("emulate_mov")) + test_emulate(); } #else static void __test_uprobe_syscall(void) --=20 2.51.1