From 8dd15887940e9a6a4304fe360c7bd7569fe9ba21 Mon Sep 17 00:00:00 2001 From: Michael Jeanson Date: Wed, 31 Jul 2024 11:20:36 -0400 Subject: [PATCH] nptl: Add for RISC-V 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 tested on a Visionfive 2 with Debian sid. Signed-off-by: Michael Jeanson Reviewed-by: Palmer Dabbelt Acked-by: Palmer Dabbelt --- sysdeps/riscv/nptl/thread_pointer.h | 40 +++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 sysdeps/riscv/nptl/thread_pointer.h diff --git a/sysdeps/riscv/nptl/thread_pointer.h b/sysdeps/riscv/nptl/thread_pointer.h new file mode 100644 index 0000000000..9e7a84a78b --- /dev/null +++ b/sysdeps/riscv/nptl/thread_pointer.h @@ -0,0 +1,40 @@ +/* __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 + . */ + +#ifndef _SYS_THREAD_POINTER_H +#define _SYS_THREAD_POINTER_H + +#include + +#if __GNUC_PREREQ (10, 3) || __glibc_clang_prereq (11, 0) +static inline void * +__thread_pointer (void) +{ + return __builtin_thread_pointer (); +} +#else +static inline void * +__thread_pointer (void) +{ + void *__thread_register; + __asm__ ("mv %0, tp" : "=r" (__thread_register)); + return __thread_register; +} +#endif + +#endif /* _SYS_THREAD_POINTER_H */