From: Evan Green <evan@rivosinc.com>
To: libc-alpha@sourceware.org
Cc: vineetg@rivosinc.com, slewis@rivosinc.com,
Florian Weimer <fweimer@redhat.com>,
palmer@rivosinc.com, Evan Green <evan@rivosinc.com>
Subject: [PATCH v13 2/7] linux: Introduce INTERNAL_VSYSCALL
Date: Tue, 27 Feb 2024 14:56:38 -0800 [thread overview]
Message-ID: <20240227225644.724901-3-evan@rivosinc.com> (raw)
In-Reply-To: <20240227225644.724901-1-evan@rivosinc.com>
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 <evan@rivosinc.com>
---
Changes in v13:
- Remove label, use -ENOSYS and return value directly (Florian)
Changes in v10:
- Introduced INTERNAL_VSYSCALL patch
sysdeps/unix/sysv/linux/sysdep-vdso.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/sysdeps/unix/sysv/linux/sysdep-vdso.h b/sysdeps/unix/sysv/linux/sysdep-vdso.h
index 189319ad98..2f53ada6e5 100644
--- a/sysdeps/unix/sysv/linux/sysdep-vdso.h
+++ b/sysdeps/unix/sysv/linux/sysdep-vdso.h
@@ -53,4 +53,16 @@
sc_ret; \
})
+#define INTERNAL_VSYSCALL(name, nr, args...) \
+ ({ \
+ long int sc_ret = -ENOSYS; \
+ \
+ __typeof (GLRO(dl_vdso_##name)) vdsop = GLRO(dl_vdso_##name); \
+ if (vdsop != NULL) \
+ sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, nr, ##args); \
+ if (sc_ret == -ENOSYS) \
+ sc_ret = INTERNAL_SYSCALL_CALL (name, ##args); \
+ sc_ret; \
+ })
+
#endif /* SYSDEP_VDSO_LINUX_H */
--
2.34.1
next prev parent reply other threads:[~2024-02-27 22:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-27 22:56 [PATCH v13 0/7] RISC-V: ifunced memcpy using new kernel hwprobe interface Evan Green
2024-02-27 22:56 ` [PATCH v13 1/7] riscv: Add Linux hwprobe syscall support Evan Green
2024-02-27 22:56 ` Evan Green [this message]
2024-02-27 22:56 ` [PATCH v13 3/7] riscv: Add hwprobe vdso call support Evan Green
2024-02-27 22:56 ` [PATCH v13 4/7] riscv: Add __riscv_hwprobe pointer to ifunc calls Evan Green
2024-02-27 22:56 ` [PATCH v13 5/7] riscv: Enable multi-arg ifunc resolvers Evan Green
2024-02-27 22:56 ` [PATCH v13 6/7] riscv: Add ifunc helper method to hwprobe.h Evan Green
2024-02-27 22:56 ` [PATCH v13 7/7] riscv: Add and use alignment-ignorant memcpy Evan Green
2024-03-02 10:33 ` Andreas Schwab
2024-03-04 18:30 ` Adhemerval Zanella Netto
2024-03-04 19:35 ` Evan Green
2024-03-02 13:52 ` Andreas Schwab
2024-03-01 15:19 ` [PATCH v13 0/7] RISC-V: ifunced memcpy using new kernel hwprobe interface Palmer Dabbelt
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