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authorWaldemar Brodkorb <wbx@openadk.org>2015-02-14 23:04:02 -0600
committerWaldemar Brodkorb <wbx@openadk.org>2015-02-14 23:04:02 -0600
commite1e46622ac0fce73d802fa4a8a2e83cc25cd9e7a (patch)
tree2c8d14e4dcc733f4227f0984ed05da5826b13acd /libpthread/linuxthreads.old/sysdeps/microblaze/pt-machine.h
parent6b6ede3d15f04fe825cfa9f697507457e3640344 (diff)
Revert "resolve merge"
This reverts commit 6b6ede3d15f04fe825cfa9f697507457e3640344.
Diffstat (limited to 'libpthread/linuxthreads.old/sysdeps/microblaze/pt-machine.h')
-rw-r--r--libpthread/linuxthreads.old/sysdeps/microblaze/pt-machine.h106
1 files changed, 106 insertions, 0 deletions
diff --git a/libpthread/linuxthreads.old/sysdeps/microblaze/pt-machine.h b/libpthread/linuxthreads.old/sysdeps/microblaze/pt-machine.h
new file mode 100644
index 000000000..e8c03f9e5
--- /dev/null
+++ b/libpthread/linuxthreads.old/sysdeps/microblaze/pt-machine.h
@@ -0,0 +1,106 @@
+/*
+ * sysdeps/microblaze/pt-machine.h -- microblaze-specific pthread definitions
+ *
+ * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
+ * Copyright (C) 2002 NEC Electronics Corporation
+ * Copyright (C) 2002 Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License. See the file COPYING.LIB in the main
+ * directory of this archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ */
+
+#ifndef _PT_MACHINE_H
+#define _PT_MACHINE_H 1
+
+#include <features.h>
+
+#ifndef PT_EI
+# define PT_EI extern inline
+#endif
+
+extern long int testandset (int *spinlock);
+extern int __compare_and_swap (long *ptr, long old, long new);
+
+/* Get some notion of the current stack. Need not be exactly the top
+ of the stack, just something somewhere in the current frame. */
+#define CURRENT_STACK_FRAME __stack_pointer
+register char *__stack_pointer __asm__ ("r1");
+
+#define HAS_COMPARE_AND_SWAP
+#define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS
+#define IMPLEMENT_TAS_WITH_CAS
+
+/* Atomically: If *PTR == OLD, set *PTR to NEW and return true,
+ otherwise do nothing and return false. */
+PT_EI int __compare_and_swap (long *ptr, long old, long new)
+{
+ unsigned long psw;
+
+ /* disable interrupts */
+ /* This is ugly ugly ugly! */
+ __asm__ __volatile__ ("mfs %0, rmsr;"
+ "andi r3, %0, ~2;"
+ "mts rmsr, r3;"
+ : "=&r" (psw)
+ :
+ : "r3");
+
+ if (likely (*ptr == old))
+ {
+ *ptr = new;
+ __asm__ __volatile__ ("mts rmsr, %0;" :: "r" (psw)); /* re-enable */
+ return 1;
+ }
+ else
+ {
+ __asm__ __volatile__ ("mts rmsr, %0;" :: "r" (psw)); /* re-enable */
+ return 0;
+ }
+}
+
+/* like above's __compare_and_swap() but it first syncs the memory
+ (This is also the difference between both functions in e.g.
+ ../powerpc/pt-machine.h)
+ Doing this additional sync fixes a hang of __pthread_alt_unlock()
+ (Falk Brettschneider <fbrettschneider@baumeroptronic.de>) */
+PT_EI int
+__compare_and_swap_with_release_semantics (long *p,
+ long oldval, long newval)
+{
+ __asm__ __volatile__ ("" : : : "memory"); /*MEMORY_BARRIER ();*/
+ return __compare_and_swap (p, oldval, newval);
+}
+
+
+#ifndef IMPLEMENT_TAS_WITH_CAS
+/* Spinlock implementation; required. */
+PT_EI long int testandset (int *spinlock)
+{
+ unsigned psw;
+
+ /* disable interrupts */
+ __asm__ __volatile__ ("mfs %0, rmsr;"
+ "andi r3, %0, ~2;"
+ "mts rmsr, r3;"
+ : "=&r" (psw)
+ :
+ : "r3");
+
+ if (*spinlock)
+ {
+ /* Enable ints */
+ __asm__ __volatile__ ("mts rmsr, %0;" :: "r" (psw));
+ return 1;
+ } else {
+ *spinlock=1;
+ /* Enable ints */
+ __asm__ __volatile__ ("mts rmsr, %0;" :: "r" (psw));
+ return 0;
+ }
+}
+
+#endif
+#endif /* pt-machine.h */