Warning: This file is not a C or C++ file. It does not have highlighting.

1/* Low-level functions for atomic operations. Nios II version.
2 Copyright (C) 2012-2022 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, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _NIOS2_ATOMIC_MACHINE_H
20#define _NIOS2_ATOMIC_MACHINE_H 1
21
22#define __HAVE_64B_ATOMICS 0
23#define USE_ATOMIC_COMPILER_BUILTINS 0
24
25/* XXX Is this actually correct? */
26#define ATOMIC_EXCHANGE_USES_CAS 1
27
28#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
29 (abort (), (__typeof (*mem)) 0)
30#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
31 (abort (), (__typeof (*mem)) 0)
32#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
33 (abort (), (__typeof (*mem)) 0)
34
35#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
36 (abort (), 0)
37#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
38 (abort (), 0)
39#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \
40 (abort (), 0)
41
42#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
43 ({ \
44 register int r2 asm ("r2"); \
45 register int* r4 asm ("r4") = (int*)(mem); \
46 register int r5 asm ("r5"); \
47 register int r6 asm ("r6") = (int)(newval); \
48 int retval, orig_oldval = (int)(oldval); \
49 long kernel_cmpxchg = 0x1004; \
50 while (1) \
51 { \
52 r5 = *r4; \
53 if (r5 != orig_oldval) \
54 { \
55 retval = r5; \
56 break; \
57 } \
58 asm volatile ("callr %1\n" \
59 : "=r" (r2) \
60 : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \
61 : "ra", "memory"); \
62 if (!r2) { retval = orig_oldval; break; } \
63 } \
64 (__typeof (*(mem))) retval; \
65 })
66
67#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
68 ({ \
69 register int r2 asm ("r2"); \
70 register int *r4 asm ("r4") = (int*)(mem); \
71 register int r5 asm ("r5") = (int)(oldval); \
72 register int r6 asm ("r6") = (int)(newval); \
73 long kernel_cmpxchg = 0x1004; \
74 asm volatile ("callr %1\n" \
75 : "=r" (r2) \
76 : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \
77 : "ra", "memory"); \
78 r2; \
79 })
80
81#define atomic_full_barrier() ({ asm volatile ("sync"); })
82
83#endif /* _NIOS2_ATOMIC_MACHINE_H */
84

Warning: This file is not a C or C++ file. It does not have highlighting.

source code of glibc/sysdeps/unix/sysv/linux/nios2/atomic-machine.h