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/* Low-level functions for atomic operations.  ARM 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>
 
 
static inline int
__attribute__ ((unused))
exchange_and_add (volatile uint32_t *mem, int val)
{
  int tmp1;
  int tmp2;
  int result;
  __asm__ ("\n"
           "0:\tldr\t%0,[%3]\n\t"
           "add\t%1,%0,%4\n\t"
           "swp\t%2,%1,[%3]\n\t"
           "cmp\t%0,%2\n\t"
           "swpne\t%1,%2,[%3]\n\t"
           "bne\t0b"
           : "=&r" (result), "=&r" (tmp1), "=&r" (tmp2)
           : "r" (mem), "r"(val)
           : "cc", "memory");
  return result;
}
 
static inline void
__attribute__ ((unused))
atomic_add (volatile uint32_t *mem, int val)
{
  int tmp1;
  int tmp2;
  int tmp3;
  __asm__ ("\n"
           "0:\tldr\t%0,[%3]\n\t"
           "add\t%1,%0,%4\n\t"
           "swp\t%2,%1,[%3]\n\t"
           "cmp\t%0,%2\n\t"
           "swpne\t%1,%2,[%3]\n\t"
           "bne\t0b"
           : "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
           : "r" (mem), "r"(val)
           : "cc", "memory");
}
 
static inline int
__attribute__ ((unused))
compare_and_swap (volatile long int *p, long int oldval, long int newval)
{
  int result, tmp;
  __asm__ ("\n"
           "0:\tldr\t%1,[%2]\n\t"
           "mov\t%0,#0\n\t"
           "cmp\t%1,%4\n\t"
           "bne\t1f\n\t"
           "swp\t%0,%3,[%2]\n\t"
           "cmp\t%1,%0\n\t"
           "swpne\t%1,%0,[%2]\n\t"
           "bne\t0b\n\t"
           "mov\t%0,#1\n"
           "1:"
           : "=&r" (result), "=&r" (tmp)
           : "r" (p), "r" (newval), "r" (oldval)
           : "cc", "memory");
  return result;
}
 
#endif /* atomicity.h */

Line No.	Rev	Author	Line
1	1325	phoenix	`/* Low-level functions for atomic operations. ARM version.`
2			`Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.`
3			`This file is part of the GNU C Library.`
4
5			`The GNU C Library is free software; you can redistribute it and/or`
6			`modify it under the terms of the GNU Lesser General Public`
7			`License as published by the Free Software Foundation; either`
8			`version 2.1 of the License, or (at your option) any later version.`
9
10			`The GNU C Library is distributed in the hope that it will be useful,`
11			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
12			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
13			`Lesser General Public License for more details.`
14
15			`You should have received a copy of the GNU Lesser General Public`
16			`License along with the GNU C Library; if not, write to the Free`
17			`Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA`
18			`02111-1307 USA. */`
19
20			`#ifndef _ATOMICITY_H`
21			`#define _ATOMICITY_H 1`
22
23			`#include <inttypes.h>`
24
25
26			`static inline int`
27			`__attribute__ ((unused))`
28			`exchange_and_add (volatile uint32_t *mem, int val)`
29			`{`
30			`int tmp1;`
31			`int tmp2;`
32			`int result;`
33			`__asm__ ("\n"`
34			`"0:\tldr\t%0,[%3]\n\t"`
35			`"add\t%1,%0,%4\n\t"`
36			`"swp\t%2,%1,[%3]\n\t"`
37			`"cmp\t%0,%2\n\t"`
38			`"swpne\t%1,%2,[%3]\n\t"`
39			`"bne\t0b"`
40			`: "=&r" (result), "=&r" (tmp1), "=&r" (tmp2)`
41			`: "r" (mem), "r"(val)`
42			`: "cc", "memory");`
43			`return result;`
44			`}`
45
46			`static inline void`
47			`__attribute__ ((unused))`
48			`atomic_add (volatile uint32_t *mem, int val)`
49			`{`
50			`int tmp1;`
51			`int tmp2;`
52			`int tmp3;`
53			`__asm__ ("\n"`
54			`"0:\tldr\t%0,[%3]\n\t"`
55			`"add\t%1,%0,%4\n\t"`
56			`"swp\t%2,%1,[%3]\n\t"`
57			`"cmp\t%0,%2\n\t"`
58			`"swpne\t%1,%2,[%3]\n\t"`
59			`"bne\t0b"`
60			`: "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)`
61			`: "r" (mem), "r"(val)`
62			`: "cc", "memory");`
63			`}`
64
65			`static inline int`
66			`__attribute__ ((unused))`
67			`compare_and_swap (volatile long int *p, long int oldval, long int newval)`
68			`{`
69			`int result, tmp;`
70			`__asm__ ("\n"`
71			`"0:\tldr\t%1,[%2]\n\t"`
72			`"mov\t%0,#0\n\t"`
73			`"cmp\t%1,%4\n\t"`
74			`"bne\t1f\n\t"`
75			`"swp\t%0,%3,[%2]\n\t"`
76			`"cmp\t%1,%0\n\t"`
77			`"swpne\t%1,%0,[%2]\n\t"`
78			`"bne\t0b\n\t"`
79			`"mov\t%0,#1\n"`
80			`"1:"`
81			`: "=&r" (result), "=&r" (tmp)`
82			`: "r" (p), "r" (newval), "r" (oldval)`
83			`: "cc", "memory");`
84			`return result;`
85			`}`
86
87			`#endif /* atomicity.h */`

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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [sysdeps/] [linux/] [arm/] [bits/] [atomicity.h] - Blame information for rev 1779