2 * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
3 * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
4 * Copyright (c) 1999-2003 by Hewlett-Packard Company. All rights reserved.
7 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
8 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
10 * Permission is hereby granted to use or copy this program
11 * for any purpose, provided the above notices are retained on all copies.
12 * Permission to modify the code and to distribute modified code is granted,
13 * provided the above notices are retained, and a notice that the code was
14 * modified is included with the above copyright notice.
18 #include "../test_and_set_t_is_ao_t.h"
20 #include "../standard_ao_double_t.h"
22 #ifndef AO_UNIPROCESSOR
26 __asm__ __volatile__("dmb st" : : : "memory");
28 # define AO_HAVE_nop_write
31 /* TODO: Adjust version check on fixing double-wide AO support in GCC. */
35 AO_double_load(const volatile AO_double_t *addr)
40 /* Note that STXP cannot be discarded because LD[A]XP is not */
41 /* single-copy atomic (unlike LDREXD for 32-bit ARM). */
43 __asm__ __volatile__("//AO_double_load\n"
45 " stxp %w2, %0, %1, %3"
46 : "=&r" (result.AO_val1), "=&r" (result.AO_val2), "=&r" (status)
48 } while (AO_EXPECT_FALSE(status));
51 # define AO_HAVE_double_load
54 AO_double_load_acquire(const volatile AO_double_t *addr)
60 __asm__ __volatile__("//AO_double_load_acquire\n"
62 " stxp %w2, %0, %1, %3"
63 : "=&r" (result.AO_val1), "=&r" (result.AO_val2), "=&r" (status)
65 } while (AO_EXPECT_FALSE(status));
68 # define AO_HAVE_double_load_acquire
71 AO_double_store(volatile AO_double_t *addr, AO_double_t value)
77 __asm__ __volatile__("//AO_double_store\n"
79 " stxp %w2, %4, %5, %3"
80 : "=&r" (old_val.AO_val1), "=&r" (old_val.AO_val2), "=&r" (status),
82 : "r" (value.AO_val1), "r" (value.AO_val2));
83 /* Compared to the arm.h implementation, the 'cc' (flags) are not */
84 /* clobbered because A64 has no concept of conditional execution. */
85 } while (AO_EXPECT_FALSE(status));
87 # define AO_HAVE_double_store
90 AO_double_store_release(volatile AO_double_t *addr, AO_double_t value)
96 __asm__ __volatile__("//AO_double_store_release\n"
98 " stlxp %w2, %4, %5, %3"
99 : "=&r" (old_val.AO_val1), "=&r" (old_val.AO_val2), "=&r" (status),
101 : "r" (value.AO_val1), "r" (value.AO_val2));
102 } while (AO_EXPECT_FALSE(status));
104 # define AO_HAVE_double_store_release
107 AO_double_compare_and_swap(volatile AO_double_t *addr,
108 AO_double_t old_val, AO_double_t new_val)
114 __asm__ __volatile__("//AO_double_compare_and_swap\n"
116 : "=&r" (tmp.AO_val1), "=&r" (tmp.AO_val2)
118 if (tmp.AO_val1 != old_val.AO_val1 || tmp.AO_val2 != old_val.AO_val2)
120 __asm__ __volatile__(
121 " stxp %w0, %2, %3, %1\n"
122 : "=&r" (result), "=Q" (*addr)
123 : "r" (new_val.AO_val1), "r" (new_val.AO_val2));
124 } while (AO_EXPECT_FALSE(result));
127 # define AO_HAVE_double_compare_and_swap
130 AO_double_compare_and_swap_acquire(volatile AO_double_t *addr,
131 AO_double_t old_val, AO_double_t new_val)
137 __asm__ __volatile__("//AO_double_compare_and_swap_acquire\n"
138 " ldaxp %0, %1, %2\n"
139 : "=&r" (tmp.AO_val1), "=&r" (tmp.AO_val2)
141 if (tmp.AO_val1 != old_val.AO_val1 || tmp.AO_val2 != old_val.AO_val2)
143 __asm__ __volatile__(
144 " stxp %w0, %2, %3, %1\n"
145 : "=&r" (result), "=Q" (*addr)
146 : "r" (new_val.AO_val1), "r" (new_val.AO_val2));
147 } while (AO_EXPECT_FALSE(result));
150 # define AO_HAVE_double_compare_and_swap_acquire
153 AO_double_compare_and_swap_release(volatile AO_double_t *addr,
154 AO_double_t old_val, AO_double_t new_val)
160 __asm__ __volatile__("//AO_double_compare_and_swap_release\n"
162 : "=&r" (tmp.AO_val1), "=&r" (tmp.AO_val2)
164 if (tmp.AO_val1 != old_val.AO_val1 || tmp.AO_val2 != old_val.AO_val2)
166 __asm__ __volatile__(
167 " stlxp %w0, %2, %3, %1\n"
168 : "=&r" (result), "=Q" (*addr)
169 : "r" (new_val.AO_val1), "r" (new_val.AO_val2));
170 } while (AO_EXPECT_FALSE(result));
173 # define AO_HAVE_double_compare_and_swap_release
176 AO_double_compare_and_swap_full(volatile AO_double_t *addr,
177 AO_double_t old_val, AO_double_t new_val)
183 __asm__ __volatile__("//AO_double_compare_and_swap_full\n"
184 " ldaxp %0, %1, %2\n"
185 : "=&r" (tmp.AO_val1), "=&r" (tmp.AO_val2)
187 if (tmp.AO_val1 != old_val.AO_val1 || tmp.AO_val2 != old_val.AO_val2)
189 __asm__ __volatile__(
190 " stlxp %w0, %2, %3, %1\n"
191 : "=&r" (result), "=Q" (*addr)
192 : "r" (new_val.AO_val1), "r" (new_val.AO_val2));
193 } while (AO_EXPECT_FALSE(result));
196 # define AO_HAVE_double_compare_and_swap_full
197 #endif /* __GNUC__ >= 4 */