summaryrefslogtreecommitdiff
path: root/libpthread/linuxthreads/sysdeps/bfin/pt-machine.h
diff options
context:
space:
mode:
authorWaldemar Brodkorb <wbx@uclibc-ng.org>2016-05-18 18:41:24 +0200
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-05-18 18:41:24 +0200
commit6a8ccc95528f5e86a8770ed15ce89609b5b3dee9 (patch)
treebbd4df35b4d4a6a8b00d7a5e61fb2668b850ad62 /libpthread/linuxthreads/sysdeps/bfin/pt-machine.h
parent398a27a5b323956344b4f831d892fed3bd9813c7 (diff)
remove linuxthreads.new, rename linuxthreads.old
Linuxthreads.new isn't really useful with the existence of NPTL/TLS for well supported architectures. There is no reason to use LT.new for ARM/MIPS or other architectures supporting NPTL/TLS. It is not available for noMMU architectures like Blackfin or FR-V. To simplify the live of the few uClibc-ng developers, LT.new is removed and LT.old is renamed to LT. LINUXTHREADS_OLD -> UCLIBC_HAS_LINUXTHREADS
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/bfin/pt-machine.h')
-rw-r--r--libpthread/linuxthreads/sysdeps/bfin/pt-machine.h75
1 files changed, 75 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/sysdeps/bfin/pt-machine.h b/libpthread/linuxthreads/sysdeps/bfin/pt-machine.h
new file mode 100644
index 000000000..912d64b2c
--- /dev/null
+++ b/libpthread/linuxthreads/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 */