[v12,04/17] nptl: Add <thread_pointer.h> for RISC-V
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Commit Message
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(+)
Comments
* Michael Jeanson:
> 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(+)
>
> 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 */
Pinging RISC-V maintainers.
Thanks,
Florian
new file mode 100644
@@ -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 */