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Wed, 10 Jan 2024 12:51:55 -0800 (PST) Received: from evan.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id y4-20020a92c984000000b0035ff9825323sm1452018iln.30.2024.01.10.12.51.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Jan 2024 12:51:54 -0800 (PST) From: Evan Green To: libc-alpha@sourceware.org Cc: palmer@rivosinc.com, vineetg@rivosinc.com, slewis@rivosinc.com, Florian Weimer , Evan Green Subject: [PATCH v11 2/7] linux: Introduce INTERNAL_VSYSCALL Date: Wed, 10 Jan 2024 12:51:35 -0800 Message-Id: <20240110205140.754849-3-evan@rivosinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240110205140.754849-1-evan@rivosinc.com> References: <20240110205140.754849-1-evan@rivosinc.com> MIME-Version: 1.0 X-Spam-Status: No, score=-12.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Add an INTERNAL_VSYSCALL() macro that makes a vDSO call, falling back to a regular syscall, but without setting errno. Instead, the return value is plumbed straight out of the macro. Signed-off-by: Evan Green --- (no changes since v10) Changes in v10: - Introduced INTERNAL_VSYSCALL patch sysdeps/unix/sysv/linux/sysdep-vdso.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/sysdeps/unix/sysv/linux/sysdep-vdso.h b/sysdeps/unix/sysv/linux/sysdep-vdso.h index 189319ad98..f7d4b29b25 100644 --- a/sysdeps/unix/sysv/linux/sysdep-vdso.h +++ b/sysdeps/unix/sysv/linux/sysdep-vdso.h @@ -53,4 +53,23 @@ sc_ret; \ }) +#define INTERNAL_VSYSCALL(name, nr, args...) \ + ({ \ + __label__ out; \ + long int sc_ret; \ + \ + __typeof (GLRO(dl_vdso_##name)) vdsop = GLRO(dl_vdso_##name); \ + if (vdsop != NULL) \ + { \ + sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, nr, ##args); \ + if ((!INTERNAL_SYSCALL_ERROR_P (sc_ret)) || \ + (INTERNAL_SYSCALL_ERRNO (sc_ret) != ENOSYS)) \ + goto out; \ + } \ + \ + sc_ret = INTERNAL_SYSCALL_CALL (name, ##args); \ + out: \ + sc_ret; \ + }) + #endif /* SYSDEP_VDSO_LINUX_H */