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authorEric Andersen <andersen@codepoet.org>2003-03-03 20:58:42 +0000
committerEric Andersen <andersen@codepoet.org>2003-03-03 20:58:42 +0000
commit67eff66438688fddebe41f77fd252a3b2b135271 (patch)
tree18dbee3e9afe50d27095140198e2aa34df1de061 /libc/sysdeps/linux/powerpc/bits/atomicity.h
parent2229d0fa131387b9b8ad16ac88347350a080aeb5 (diff)
Initial effort at adding profiling support.
Diffstat (limited to 'libc/sysdeps/linux/powerpc/bits/atomicity.h')
-rw-r--r--libc/sysdeps/linux/powerpc/bits/atomicity.h104
1 files changed, 104 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/powerpc/bits/atomicity.h b/libc/sysdeps/linux/powerpc/bits/atomicity.h
new file mode 100644
index 000000000..a3f672e5e
--- /dev/null
+++ b/libc/sysdeps/linux/powerpc/bits/atomicity.h
@@ -0,0 +1,104 @@
+/* Low-level functions for atomic operations. PowerPC version.
+ Copyright (C) 1997, 1998, 1999, 2000 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _ATOMICITY_H
+#define _ATOMICITY_H 1
+
+#include <inttypes.h>
+
+#if BROKEN_PPC_ASM_CR0
+# define __ATOMICITY_INLINE /* nothing */
+#else
+# define __ATOMICITY_INLINE inline
+#endif
+
+static __ATOMICITY_INLINE int
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, int val)
+{
+ int tmp, result;
+ __asm__ ("\n\
+0: lwarx %0,0,%2 \n\
+ add%I3 %1,%0,%3 \n\
+ stwcx. %1,0,%2 \n\
+ bne- 0b \n\
+" : "=&b"(result), "=&r"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
+ return result;
+}
+
+static __ATOMICITY_INLINE void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+ int tmp;
+ __asm__ ("\n\
+0: lwarx %0,0,%1 \n\
+ add%I2 %0,%0,%2 \n\
+ stwcx. %0,0,%1 \n\
+ bne- 0b \n\
+" : "=&b"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
+}
+
+static __ATOMICITY_INLINE int
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+ int result;
+ __asm__ ("\n\
+0: lwarx %0,0,%1 \n\
+ sub%I2c. %0,%0,%2 \n\
+ cntlzw %0,%0 \n\
+ bne- 1f \n\
+ stwcx. %3,0,%1 \n\
+ bne- 0b \n\
+1: \n\
+" : "=&b"(result) : "r"(p), "Ir"(oldval), "r"(newval) : "cr0", "memory");
+ return result >> 5;
+}
+
+static __ATOMICITY_INLINE long int
+__attribute__ ((unused))
+always_swap (volatile long int *p, long int newval)
+{
+ long int result;
+ __asm__ ("\n\
+0: lwarx %0,0,%1 \n\
+ stwcx. %2,0,%1 \n\
+ bne- 0b \n\
+" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
+ return result;
+}
+
+static __ATOMICITY_INLINE int
+__attribute__ ((unused))
+test_and_set (volatile long int *p, long int newval)
+{
+ int result;
+ __asm__ ("\n\
+0: lwarx %0,0,%1 \n\
+ cmpwi %0,0 \n\
+ bne- 1f \n\
+ stwcx. %2,0,%1 \n\
+ bne- 0b \n\
+1: \n\
+" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
+ return result;
+}
+
+#endif /* atomicity.h */