From 3b5ebe85aabfa44583a18a7ef51bc4d387e362c1 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Tue, 12 Nov 2019 19:11:10 +0000 Subject: sparc: Use atomic compiler builtins on sparc This patch removes the arch-specific atomic instruction, relying on compiler builtins. The __sparc32_atomic_locks support is removed and a configure check is added to check if compiler uses libatomic to implement CAS. It also removes the sparc specific sem_* and pthread_barrier_* implementations. It in turn allows buidling against a LEON3/LEON4 sparcv8 target, although it will still be incompatible with generic sparcv9. Checked on sparcv9-linux-gnu and sparc64-linux-gnu. I also checked with build against sparcv8-linux-gnu with -mcpu=leon3. Tested-by: Andreas Larsson --- sysdeps/sparc/sparc64/cpu_relax.c | 38 -------------------------------------- 1 file changed, 38 deletions(-) delete mode 100644 sysdeps/sparc/sparc64/cpu_relax.c (limited to 'sysdeps/sparc/sparc64/cpu_relax.c') diff --git a/sysdeps/sparc/sparc64/cpu_relax.c b/sysdeps/sparc/sparc64/cpu_relax.c deleted file mode 100644 index b86afdec2c..0000000000 --- a/sysdeps/sparc/sparc64/cpu_relax.c +++ /dev/null @@ -1,38 +0,0 @@ -/* CPU strand yielding for busy loops. Linux/sparc64 version. - Copyright (C) 2017-2019 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 - . */ - -#include - -static void -__cpu_relax_generic (void) -{ - asm volatile ("rd %ccr, %g0;" - "rd %ccr, %g0;" - "rd %ccr, %g0"); -} - -static void -__cpu_relax_pause (void) -{ - asm volatile ("wr %g0, 128, %asr27"); -} - -sparc_libc_ifunc (__cpu_relax, - hwcap & HWCAP_SPARC_PAUSE - ? __cpu_relax_pause - : __cpu_relax_generic) -- cgit 1.4.1