68 lines
2.5 KiB
Diff
68 lines
2.5 KiB
Diff
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From 47319d002f7b5e37c179acb7d2a6d351cd112f97 Mon Sep 17 00:00:00 2001
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From: Michael Jeanson <mjeanson@efficios.com>
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Date: Wed, 23 Oct 2024 16:18:06 -0400
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Subject: [PATCH 2/3] nptl: Add <thread_pointer.h> for LoongArch
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This will be required by the rseq extensible ABI implementation on all
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Linux architectures exposing the '__rseq_size' and '__rseq_offset'
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symbols to set the initial value of the 'cpu_id' field which can be used
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by applications to test if rseq is available and registered. As long as
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the symbols are exposed it is valid for an application to perform this
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test even if rseq is not yet implemented in libc for this architecture.
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Both code paths are compile tested with build-many-glibcs.py but I don't
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have access to any hardware to run the tests.
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Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
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Reviewed-by: Arjun Shankar <arjun@redhat.com>
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---
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sysdeps/loongarch/nptl/thread_pointer.h | 36 +++++++++++++++++++++++++
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1 file changed, 36 insertions(+)
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create mode 100644 sysdeps/loongarch/nptl/thread_pointer.h
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diff --git a/sysdeps/loongarch/nptl/thread_pointer.h b/sysdeps/loongarch/nptl/thread_pointer.h
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new file mode 100644
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index 00000000..5dec2ef4
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--- /dev/null
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+++ b/sysdeps/loongarch/nptl/thread_pointer.h
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@@ -0,0 +1,36 @@
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+/* __thread_pointer definition. loongarch version.
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+ Copyright (C) 2021-2024 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library. If not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifndef _SYS_THREAD_POINTER_H
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+#define _SYS_THREAD_POINTER_H
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+
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+#include <sys/cdefs.h>
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+
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+static inline void *
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+__thread_pointer (void)
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+{
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+#if __glibc_has_builtin (__builtin_thread_pointer)
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+ return __builtin_thread_pointer ();
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+#else
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+ void *__thread_register;
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+ __asm__ ("move %0, $tp" : "=r" (__thread_register));
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+ return __thread_register;
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+#endif
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+}
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+
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+#endif /* _SYS_THREAD_POINTER_H */
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--
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2.43.0
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