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522e6ee3 | 1 | /* Low-level functions for atomic operations. Nios II version. |
688903eb | 2 | Copyright (C) 2012-2018 Free Software Foundation, Inc. |
522e6ee3 CLT |
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, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
de071d19 JM |
19 | #ifndef _NIOS2_ATOMIC_MACHINE_H |
20 | #define _NIOS2_ATOMIC_MACHINE_H 1 | |
522e6ee3 CLT |
21 | |
22 | #include <stdint.h> | |
23 | ||
24 | typedef int32_t atomic32_t; | |
25 | typedef uint32_t uatomic32_t; | |
26 | typedef int_fast32_t atomic_fast32_t; | |
27 | typedef uint_fast32_t uatomic_fast32_t; | |
28 | ||
29 | typedef intptr_t atomicptr_t; | |
30 | typedef uintptr_t uatomicptr_t; | |
31 | typedef intmax_t atomic_max_t; | |
32 | typedef uintmax_t uatomic_max_t; | |
33 | ||
34 | #define __HAVE_64B_ATOMICS 0 | |
35 | #define USE_ATOMIC_COMPILER_BUILTINS 0 | |
36 | ||
12d2dd70 SL |
37 | /* XXX Is this actually correct? */ |
38 | #define ATOMIC_EXCHANGE_USES_CAS 1 | |
39 | ||
522e6ee3 CLT |
40 | #define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \ |
41 | (abort (), (__typeof (*mem)) 0) | |
42 | #define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \ | |
43 | (abort (), (__typeof (*mem)) 0) | |
44 | #define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ | |
45 | (abort (), (__typeof (*mem)) 0) | |
46 | ||
47 | #define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \ | |
48 | (abort (), 0) | |
49 | #define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \ | |
50 | (abort (), 0) | |
51 | #define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \ | |
52 | (abort (), 0) | |
53 | ||
54 | #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ | |
55 | ({ \ | |
56 | register int r2 asm ("r2"); \ | |
57 | register int* r4 asm ("r4") = (int*)(mem); \ | |
58 | register int r5 asm ("r5"); \ | |
59 | register int r6 asm ("r6") = (int)(newval); \ | |
60 | int retval, orig_oldval = (int)(oldval); \ | |
61 | long kernel_cmpxchg = 0x1004; \ | |
62 | while (1) \ | |
63 | { \ | |
64 | r5 = *r4; \ | |
65 | if (r5 != orig_oldval) \ | |
66 | { \ | |
67 | retval = r5; \ | |
68 | break; \ | |
69 | } \ | |
70 | asm volatile ("callr %1\n" \ | |
71 | : "=r" (r2) \ | |
72 | : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \ | |
73 | : "ra", "memory"); \ | |
74 | if (!r2) { retval = orig_oldval; break; } \ | |
75 | } \ | |
76 | (__typeof (*(mem))) retval; \ | |
77 | }) | |
78 | ||
79 | #define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \ | |
80 | ({ \ | |
81 | register int r2 asm ("r2"); \ | |
82 | register int *r4 asm ("r4") = (int*)(mem); \ | |
83 | register int r5 asm ("r5") = (int)(oldval); \ | |
84 | register int r6 asm ("r6") = (int)(newval); \ | |
85 | long kernel_cmpxchg = 0x1004; \ | |
86 | asm volatile ("callr %1\n" \ | |
87 | : "=r" (r2) \ | |
88 | : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \ | |
89 | : "ra", "memory"); \ | |
90 | r2; \ | |
91 | }) | |
92 | ||
93 | #define atomic_full_barrier() ({ asm volatile ("sync"); }) | |
94 | ||
de071d19 | 95 | #endif /* _NIOS2_ATOMIC_MACHINE_H */ |