From 3d24fb25efd957f564e0cda8bb278a54db28665f Mon Sep 17 00:00:00 2001 From: Michael Jeanson Date: Wed, 23 Oct 2024 16:18:06 -0400 Subject: [PATCH] nptl: Add for LoongArch 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 initial value of the 'cpu_id' field which can be used by applications to test if rseq is available and registered. As long as the symbols are exposed it is valid for an application to perform this test even if rseq is not yet implemented in libc for this architecture. Both code paths are compile tested with build-many-glibcs.py but I don't have access to any hardware to run the tests. Signed-off-by: Michael Jeanson Reviewed-by: Arjun Shankar --- sysdeps/loongarch/nptl/thread_pointer.h | 36 +++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 sysdeps/loongarch/nptl/thread_pointer.h diff --git a/sysdeps/loongarch/nptl/thread_pointer.h b/sysdeps/loongarch/nptl/thread_pointer.h new file mode 100644 index 0000000000..5dec2ef4c6 --- /dev/null +++ b/sysdeps/loongarch/nptl/thread_pointer.h @@ -0,0 +1,36 @@ +/* __thread_pointer definition. loongarch 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 + . */ + +#ifndef _SYS_THREAD_POINTER_H +#define _SYS_THREAD_POINTER_H + +#include + +static inline void * +__thread_pointer (void) +{ +#if __glibc_has_builtin (__builtin_thread_pointer) + return __builtin_thread_pointer (); +#else + void *__thread_register; + __asm__ ("move %0, $tp" : "=r" (__thread_register)); + return __thread_register; +#endif +} + +#endif /* _SYS_THREAD_POINTER_H */ -- 2.43.5