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f7a9f785 | 1 | /* Copyright (C) 2010-2016 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010. | |
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 | |
ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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de071d19 JM |
19 | #ifndef _ATOMIC_MACHINE_H |
20 | #define _ATOMIC_MACHINE_H 1 | |
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21 | |
22 | #include <stdint.h> | |
23 | #include <sysdep.h> | |
0f4341fb | 24 | #include <m68k-vdso.h> |
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25 | |
26 | /* Coldfire has no atomic compare-and-exchange operation, but the | |
27 | kernel provides userspace atomicity operations. Use them. */ | |
28 | ||
29 | typedef int32_t atomic32_t; | |
30 | typedef uint32_t uatomic32_t; | |
31 | typedef int_fast32_t atomic_fast32_t; | |
32 | typedef uint_fast32_t uatomic_fast32_t; | |
33 | ||
34 | typedef intptr_t atomicptr_t; | |
35 | typedef uintptr_t uatomicptr_t; | |
36 | typedef intmax_t atomic_max_t; | |
37 | typedef uintmax_t uatomic_max_t; | |
38 | ||
1ea339b6 TR |
39 | #define __HAVE_64B_ATOMICS 0 |
40 | #define USE_ATOMIC_COMPILER_BUILTINS 0 | |
41 | ||
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42 | /* The only basic operation needed is compare and exchange. */ |
43 | /* For ColdFire we'll have to trap into the kernel mode anyway, | |
44 | so trap from the library rather then from the kernel wrapper. */ | |
45 | #ifdef SHARED | |
46 | # define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ | |
47 | ({ \ | |
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48 | /* Use temporary variables to workaround call-clobberness of \ |
49 | the registers. */ \ | |
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50 | __typeof (mem) _mem = mem; \ |
51 | __typeof (oldval) _oldval = oldval; \ | |
52 | __typeof (newval) _newval = newval; \ | |
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53 | register uint32_t *_a0 asm ("a0") = (uint32_t *) _mem; \ |
54 | register uint32_t _d0 asm ("d0") = (uint32_t) _oldval; \ | |
55 | register uint32_t _d1 asm ("d1") = (uint32_t) _newval; \ | |
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56 | void *tmp; \ |
57 | \ | |
58 | asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %2\n\t" \ | |
59 | "lea (-6, %%pc, %2), %2\n\t" \ | |
60 | "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_cmpxchg_32) \ | |
61 | "@GOT(%2), %2\n\t" \ | |
62 | "movel (%2), %2\n\t" \ | |
63 | "jsr (%2)\n\t" \ | |
64 | : "+d" (_d0), "+m" (*_a0), "=&a" (tmp) \ | |
65 | : "a" (_a0), "d" (_d1)); \ | |
45819cbc | 66 | (__typeof (oldval)) _d0; \ |
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67 | }) |
68 | #else | |
69 | # define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ | |
70 | ({ \ | |
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71 | /* Use temporary variables to workaround call-clobberness of \ |
72 | the registers. */ \ | |
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73 | __typeof (mem) _mem = mem; \ |
74 | __typeof (oldval) _oldval = oldval; \ | |
75 | __typeof (newval) _newval = newval; \ | |
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76 | register uint32_t _d0 asm ("d0") = SYS_ify (atomic_cmpxchg_32); \ |
77 | register uint32_t *_a0 asm ("a0") = (uint32_t *) _mem; \ | |
78 | register uint32_t _d2 asm ("d2") = (uint32_t) _oldval; \ | |
79 | register uint32_t _d1 asm ("d1") = (uint32_t) _newval; \ | |
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80 | \ |
81 | asm ("trap #0" \ | |
82 | : "+d" (_d0), "+m" (*_a0) \ | |
83 | : "a" (_a0), "d" (_d2), "d" (_d1)); \ | |
45819cbc | 84 | (__typeof (oldval)) _d0; \ |
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85 | }) |
86 | #endif | |
87 | ||
88 | #ifdef SHARED | |
89 | # define atomic_full_barrier() \ | |
90 | ({ \ | |
91 | void *tmp; \ | |
92 | \ | |
93 | asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %0\n\t" \ | |
94 | "lea (-6, %pc, %0), %0\n\t" \ | |
95 | "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_barrier) \ | |
96 | "@GOT(%0), %0\n\t" \ | |
97 | "movel (%0), %0\n\t" \ | |
98 | "jsr (%0)\n\t" \ | |
99 | : "=&a" (tmp)); \ | |
100 | }) | |
101 | #else | |
102 | # define atomic_full_barrier() \ | |
103 | (INTERNAL_SYSCALL (atomic_barrier, , 0), (void) 0) | |
104 | #endif | |
105 | ||
106 | #endif |