From: Evan Green <evan@rivosinc.com>
To: libc-alpha@sourceware.org
Cc: vineetg@rivosinc.com, slewis@rivosinc.com, palmer@rivosinc.com,
Florian Weimer <fweimer@redhat.com>,
Evan Green <evan@rivosinc.com>
Subject: [PATCH v10 2/7] linux: Introduce INTERNAL_VSYSCALL
Date: Wed, 13 Dec 2023 13:11:37 -0800 [thread overview]
Message-ID: <20231213211142.1543025-3-evan@rivosinc.com> (raw)
In-Reply-To: <20231213211142.1543025-1-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 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 a51b5deb37..2a1fc17e23 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 */
--
2.34.1
next prev parent reply other threads:[~2023-12-13 21:11 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-13 21:11 [PATCH v10 0/7] RISC-V: ifunced memcpy using new kernel hwprobe interface Evan Green
2023-12-13 21:11 ` [PATCH v10 1/7] riscv: Add Linux hwprobe syscall support Evan Green
2023-12-13 21:11 ` Evan Green [this message]
2023-12-13 21:11 ` [PATCH v10 3/7] riscv: Add hwprobe vdso call support Evan Green
2023-12-13 21:11 ` [PATCH v10 4/7] riscv: Add __riscv_hwprobe pointer to ifunc calls Evan Green
2023-12-13 21:11 ` [PATCH v10 5/7] riscv: Enable multi-arg ifunc resolvers Evan Green
2023-12-13 21:11 ` [PATCH v10 6/7] riscv: Add ifunc helper method to hwprobe.h Evan Green
2024-01-08 18:53 ` Adhemerval Zanella Netto
2023-12-13 21:11 ` [PATCH v10 7/7] riscv: Add and use alignment-ignorant memcpy Evan Green
2024-01-08 18:56 ` Adhemerval Zanella Netto
2024-01-08 17:06 ` [PATCH v10 0/7] RISC-V: ifunced memcpy using new kernel hwprobe interface Evan Green
2024-01-08 18:10 ` Palmer Dabbelt
2024-01-09 12:06 ` Stefan O'Rear
2024-01-09 17:10 ` Evan Green
2024-01-09 18:29 ` Stefan O'Rear
2024-01-09 18:41 ` Evan Green
2024-01-09 19:09 ` Stefan O'Rear
2024-01-09 19:18 ` enh
2024-01-09 19:36 ` Evan Green
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