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Rao" Cc: bpf@vger.kernel.org, Ilya Leoshkevich Subject: [PATCH bpf-next v3 05/11] libbpf: Add PT_REGS_SYSCALL_REGS macro Date: Fri, 4 Feb 2022 15:50:12 +0100 Message-Id: <20220204145018.1983773-6-iii@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220204145018.1983773-1-iii@linux.ibm.com> References: <20220204145018.1983773-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 5JvOflJ95fDtw92M5vQYDON--6nZyeXk X-Proofpoint-GUID: z_LYIL4S1Sur5_dim_Zr3N0JPQ5wc1AN 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=2022-02-04_05,2022-02-03_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=935 lowpriorityscore=0 phishscore=0 clxscore=1015 impostorscore=0 adultscore=0 mlxscore=0 spamscore=0 suspectscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202040082 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Some architectures 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, using `passing pt_regs *` as a default. Signed-off-by: Ilya Leoshkevich --- tools/lib/bpf/bpf_tracing.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h index 30f0964f8c9e..08d2990c006f 100644 --- a/tools/lib/bpf/bpf_tracing.h +++ b/tools/lib/bpf/bpf_tracing.h @@ -334,6 +334,15 @@ 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 +#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