diff options
Diffstat (limited to 'libpthread/linuxthreads.old/sysdeps/bfin/pt-machine.h')
-rw-r--r-- | libpthread/linuxthreads.old/sysdeps/bfin/pt-machine.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/libpthread/linuxthreads.old/sysdeps/bfin/pt-machine.h b/libpthread/linuxthreads.old/sysdeps/bfin/pt-machine.h new file mode 100644 index 000000000..912d64b2c --- /dev/null +++ b/libpthread/linuxthreads.old/sysdeps/bfin/pt-machine.h @@ -0,0 +1,75 @@ +/* Machine-dependent pthreads configuration and inline functions. + Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Richard Henderson <rth@tamu.edu>. + + 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; see the file COPYING.LIB. If + not, see <http://www.gnu.org/licenses/>. */ + +#ifndef _PT_MACHINE_H +#define _PT_MACHINE_H 1 + +#include <features.h> + +#ifndef PT_EI +# define PT_EI __extern_always_inline +#endif + +#include <asm/fixed_code.h> + +/* Spinlock implementation; required. */ +/* The semantics of the TESTSET instruction cannot be guaranteed. We cannot + easily move all locks used by linux kernel to non-cacheable memory. + EXCPT 0x4 is used to trap into kernel to do the atomic testandset. + It's ugly. But it's the only thing we can do now. + The handler of EXCPT 0x4 expects the address of the lock is passed through + R0. And the result is returned by R0. */ +PT_EI long int +testandset (int *spinlock) +{ + long int res; + + __asm__ __volatile__ ( + "CALL (%4);" + : "=q0" (res), "=m" (*spinlock) + : "qA" (spinlock), "m" (*spinlock), "a" (ATOMIC_XCHG32), "q1" (1) + : "RETS", "cc", "memory"); + + return res; +} + +#define HAS_COMPARE_AND_SWAP +PT_EI int +__compare_and_swap (long int *p, long int oldval, long int newval) +{ + long int readval; + __asm__ __volatile__ ( + "CALL (%5);" + : "=q0" (readval), "=m" (*p) + : "qA" (p), + "q1" (oldval), + "q2" (newval), + "a" (ATOMIC_CAS32), + "m" (*p) + : "RETS", "memory", "cc"); + return readval == oldval; +} + +#ifdef SHARED +# define PTHREAD_STATIC_FN_REQUIRE(name) +#else +# define PTHREAD_STATIC_FN_REQUIRE(name) __asm__ (".globl " "_"#name); +#endif + +#endif /* pt-machine.h */ |