about summary refs log tree commit diff
path: root/sysdeps/powerpc/bits/atomic.h
blob: c33ae564ce916e7ac553d82235945930fcbf9a0f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/* Atomic operations.  PowerPC Common version.
   Copyright (C) 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.

   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.  */

/*
 * Never include sysdeps/powerpc/bits/atomic.h directly. 
 * Alway use include/atomic.h which will include either 
 * sysdeps/powerpc/powerpc32/bits/atomic.h 
 * or 
 * sysdeps/powerpc/powerpc64/bits/atomic.h 
 * as appropriate and which in turn include this file.
 */

#include <stdint.h>

typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;

typedef int64_t atomic64_t;
typedef uint64_t uatomic64_t;
typedef int_fast64_t atomic_fast64_t;
typedef uint_fast64_t uatomic_fast64_t;

typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;

/* 
 * Powerpc does not have byte and halfword forms of load and reserve and 
 * store conditional. So for powerpc we stub out the 8- and 16-bit forms.
 */
#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
  (abort (), 0)

#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
  (abort (), 0)

#ifdef UP
# define __ARCH_ACQ_INSTR	""
# define __ARCH_REL_INSTR	""
#else
# define __ARCH_ACQ_INSTR	"isync"
# define __ARCH_REL_INSTR	"sync"
#endif

#define atomic_full_barrier()	__asm ("sync" ::: "memory")
#define atomic_write_barrier()	__asm ("eieio" ::: "memory")

/*
 * XXX At present these have both acquire and release semantics.
 * Ultimately we should do separate _acq and _rel versions.
 */

#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
  ({									      \
      __typeof (*(mem)) __tmp;						      \
      __typeof (mem)  __memp = (mem);					      \
      __asm __volatile (__ARCH_REL_INSTR "\n"				      \
		        "1:	lwarx	%0,0,%1\n"			      \
		        "	cmpw	%0,%2\n"			      \
		        "	bne	2f\n"				      \
		        "	stwcx.	%3,0,%1\n"			      \
		        "	bne-	1b\n"				      \
		        "2:	" __ARCH_ACQ_INSTR			      \
		        : "=&r" (__tmp)					      \
		        : "b" (__memp), "r" (oldval), "r" (newval)	      \
		        : "cr0", "memory");				      \
      __tmp;								      \
  })

#define __arch_atomic_exchange_32(mem, value) \
  ({									      \
    __typeof (*mem) __val;						      \
    __asm __volatile (__ARCH_REL_INSTR "\n"				      \
		      "1:	lwarx	%0,0,%2\n"			      \
		      "		stwcx.	%3,0,%2\n"			      \
		      "		bne-	1b"				      \
		      : "=&r" (__val), "=m" (*mem)			      \
		      : "b" (mem), "r" (value), "1" (*mem)		      \
		      : "cr0");						      \
    __val;								      \
  })

#define __arch_atomic_exchange_and_add_32(mem, value) \
  ({									      \
    __typeof (*mem) __val, __tmp;					      \
    __asm __volatile ("1:	lwarx	%0,0,%3\n"			      \
		      "		add	%1,%0,%4\n"			      \
		      "		stwcx.	%1,0,%3\n"			      \
		      "		bne-	1b"				      \
		      : "=&b" (__val), "=&r" (__tmp), "=m" (*mem)	      \
		      : "b" (mem), "r" (value), "2" (*mem)		      \
		      : "cr0");						      \
    __val;								      \
  })

#define __arch_atomic_decrement_if_positive_32(mem) \
  ({ int __val, __tmp;							      \
     __asm __volatile ("1:	lwarx	%0,0,%3\n"			      \
		       "	cmpwi	0,%0,0\n"			      \
		       "	addi	%1,%0,-1\n"			      \
		       "	ble	2f\n"				      \
		       "	stwcx.	%1,0,%3\n"			      \
		       "	bne-	1b\n"				      \
		       "2:	" __ARCH_ACQ_INSTR			      \
		       : "=&b" (__val), "=&r" (__tmp), "=m" (*mem)	      \
		       : "b" (mem), "2" (*mem)				      \
		       : "cr0");					      \
     __val;								      \
  })


#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
  ({									      \
    __typeof (*(mem)) __result;						      \
    if (sizeof (*mem) == 4)						      \
      __result = __arch_compare_and_exchange_val_32_acq(mem, newval, oldval); \
    else if (sizeof (*mem) == 8)					      \
      __result = __arch_compare_and_exchange_val_64_acq(mem, newval, oldval); \
    else 								      \
       abort ();							      \
    __result;								      \
  })

#define atomic_exchange(mem, value) \
  ({									      \
    __typeof (*(mem)) __result;						      \
    if (sizeof (*mem) == 4)						      \
      __result = __arch_atomic_exchange_32 (mem, value);		      \
    else if (sizeof (*mem) == 8)					      \
      __result = __arch_atomic_exchange_64 (mem, value);		      \
    else 								      \
       abort ();							      \
    __result;								      \
  })

#define atomic_exchange_and_add(mem, value) \
  ({									      \
    __typeof (*(mem)) __result;						      \
    if (sizeof (*mem) == 4)						      \
      __result = __arch_atomic_exchange_and_add_32 (mem, value);	      \
    else if (sizeof (*mem) == 8)					      \
      __result = __arch_atomic_exchange_and_add_64 (mem, value);	      \
    else 								      \
       abort ();							      \
    __result;								      \
  })


/* Decrement *MEM if it is > 0, and return the old value.  */
#define atomic_decrement_if_positive(mem) \
  ({ __typeof (*(mem)) __result;					      \
    if (sizeof (*mem) == 4)						      \
      __result = __arch_atomic_decrement_if_positive_32 (mem);		      \
    else if (sizeof (*mem) == 8)					      \
      __result = __arch_atomic_decrement_if_positive_64 (mem);		      \
    else								      \
       abort ();							      \
    __result;								      \
  })