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Wed, 9 Feb 2022 02:17:50 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B835FA4054; Wed, 9 Feb 2022 02:17:49 +0000 (GMT) Received: from heavy.lan (unknown [9.171.78.41]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 9 Feb 2022 02:17:49 +0000 (GMT) From: Ilya Leoshkevich To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Alexander Gordeev Cc: bpf@vger.kernel.org, Ilya Leoshkevich Subject: [PATCH bpf-next v5 02/10] libbpf: Add PT_REGS_SYSCALL_REGS macro Date: Wed, 9 Feb 2022 03:17:37 +0100 Message-Id: <20220209021745.2215452-3-iii@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220209021745.2215452-1-iii@linux.ibm.com> References: <20220209021745.2215452-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 4arUK9C-lE1QDblazVHtjUtgtCTr3xff X-Proofpoint-GUID: miog70DscaN_0YaaMmuXA62JujO-q6y6 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-08_08,2022-02-07_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 impostorscore=0 mlxlogscore=995 clxscore=1015 adultscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202090014 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Architectures that select ARCH_HAS_SYSCALL_WRAPPER pass a pointer to struct pt_regs to syscall handlers, others unpack it into individual function parameters. Introduce a macro to describe what a particular arch does. Signed-off-by: Ilya Leoshkevich --- tools/lib/bpf/bpf_tracing.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h index 032ba809f3e5..a5e92656bfba 100644 --- a/tools/lib/bpf/bpf_tracing.h +++ b/tools/lib/bpf/bpf_tracing.h @@ -326,6 +326,16 @@ struct pt_regs; #endif /* defined(bpf_target_defined) */ +/* + * When invoked from a syscall handler kprobe, returns a pointer to a + * struct pt_regs containing syscall arguments and suitable for passing to + * PT_REGS_PARMn_SYSCALL() and PT_REGS_PARMn_CORE_SYSCALL(). + */ +#ifndef PT_REGS_SYSCALL_REGS +/* By default, assume that the arch selects ARCH_HAS_SYSCALL_WRAPPER. */ +#define PT_REGS_SYSCALL_REGS(ctx) ((struct pt_regs *)PT_REGS_PARM1(ctx)) +#endif + #ifndef ___bpf_concat #define ___bpf_concat(a, b) a ## b #endif