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[RFC,v11,04/17] nptl: Add <thread_pointer.h> for RISC-V

Message ID 20240801-rseq-abi-v11-split-v11-4-b7bbc0138bfd@efficios.com
State New
Headers show
Series Add rseq extensible ABI support | expand

Commit Message

Michael Jeanson Aug. 2, 2024, 7:02 p.m. UTC 
This will be required by the rseq extensible ABI implementation on all
Linux architectures exposing the __rseq_size and __rseq_offset symbols
to set the 'cpu_id' field so applications can test if rseq is
registered.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
---
 sysdeps/riscv/nptl/thread_pointer.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
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Patch

diff --git a/sysdeps/riscv/nptl/thread_pointer.h b/sysdeps/riscv/nptl/thread_pointer.h
new file mode 100644
index 0000000000..e7f6296e7d
--- /dev/null
+++ b/sysdeps/riscv/nptl/thread_pointer.h
@@ -0,0 +1,34 @@ 
+/* __thread_pointer definition.  riscv version.
+   Copyright (C) 2021-2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_THREAD_POINTER_H
+#define _SYS_THREAD_POINTER_H
+
+static inline void *
+__thread_pointer (void)
+{
+#if __GNUC_PREREQ (10, 3)
+  return __builtin_thread_pointer ();
+#else
+  void *__result;
+  __asm__ ("mv %0, tp" : "=r" (__result));
+  return __result;
+#endif /* !GCC 10.3 */
+}
+
+#endif /* _SYS_THREAD_POINTER_H */