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1 | /* Copyright (C) 2010 Free Software Foundation, Inc. |
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/>. */ | |
40111cb9 MK |
18 | |
19 | #ifndef _BITS_ATOMIC_H | |
20 | #define _BITS_ATOMIC_H 1 | |
21 | ||
22 | #include <stdint.h> | |
23 | #include <sysdep.h> | |
24 | #include <bits/m68k-vdso.h> | |
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 | ||
39 | /* The only basic operation needed is compare and exchange. */ | |
40 | /* For ColdFire we'll have to trap into the kernel mode anyway, | |
41 | so trap from the library rather then from the kernel wrapper. */ | |
42 | #ifdef SHARED | |
43 | # define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ | |
44 | ({ \ | |
45 | /* Use temporary variables to workaround call-clobberness of */ \ | |
46 | /* the registers. */ \ | |
47 | __typeof (mem) _mem = mem; \ | |
48 | __typeof (oldval) _oldval = oldval; \ | |
49 | __typeof (newval) _newval = newval; \ | |
50 | register __typeof (mem) _a0 asm ("a0") = _mem; \ | |
51 | register __typeof (oldval) _d0 asm ("d0") = _oldval; \ | |
52 | register __typeof (newval) _d1 asm ("d1") = _newval; \ | |
53 | void *tmp; \ | |
54 | \ | |
55 | asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %2\n\t" \ | |
56 | "lea (-6, %%pc, %2), %2\n\t" \ | |
57 | "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_cmpxchg_32) \ | |
58 | "@GOT(%2), %2\n\t" \ | |
59 | "movel (%2), %2\n\t" \ | |
60 | "jsr (%2)\n\t" \ | |
61 | : "+d" (_d0), "+m" (*_a0), "=&a" (tmp) \ | |
62 | : "a" (_a0), "d" (_d1)); \ | |
63 | _d0; \ | |
64 | }) | |
65 | #else | |
66 | # define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ | |
67 | ({ \ | |
68 | /* Use temporary variables to workaround call-clobberness of */ \ | |
69 | /* the registers. */ \ | |
70 | __typeof (mem) _mem = mem; \ | |
71 | __typeof (oldval) _oldval = oldval; \ | |
72 | __typeof (newval) _newval = newval; \ | |
73 | register __typeof (oldval) _d0 asm ("d0") \ | |
74 | = SYS_ify (atomic_cmpxchg_32); \ | |
75 | register __typeof (mem) _a0 asm ("a0") = _mem; \ | |
76 | register __typeof (oldval) _d2 asm ("d2") = _oldval; \ | |
77 | register __typeof (newval) _d1 asm ("d1") = _newval; \ | |
78 | \ | |
79 | asm ("trap #0" \ | |
80 | : "+d" (_d0), "+m" (*_a0) \ | |
81 | : "a" (_a0), "d" (_d2), "d" (_d1)); \ | |
82 | _d0; \ | |
83 | }) | |
84 | #endif | |
85 | ||
86 | #ifdef SHARED | |
87 | # define atomic_full_barrier() \ | |
88 | ({ \ | |
89 | void *tmp; \ | |
90 | \ | |
91 | asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %0\n\t" \ | |
92 | "lea (-6, %pc, %0), %0\n\t" \ | |
93 | "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_barrier) \ | |
94 | "@GOT(%0), %0\n\t" \ | |
95 | "movel (%0), %0\n\t" \ | |
96 | "jsr (%0)\n\t" \ | |
97 | : "=&a" (tmp)); \ | |
98 | }) | |
99 | #else | |
100 | # define atomic_full_barrier() \ | |
101 | (INTERNAL_SYSCALL (atomic_barrier, , 0), (void) 0) | |
102 | #endif | |
103 | ||
104 | #endif |