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| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2005 Ondrej Palkovsky |
2 | * Copyright (c) 2005 Ondrej Palkovsky |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | /** @addtogroup libcmips32 |
29 | /** @addtogroup libcmips32 |
| 30 | * @{ |
30 | * @{ |
| 31 | */ |
31 | */ |
| 32 | /** @file |
32 | /** @file |
| 33 | * @ingroup libcmips32eb |
33 | * @ingroup libcmips32eb |
| 34 | */ |
34 | */ |
| 35 | 35 | ||
| 36 | #ifndef LIBC_mips32_ATOMIC_H_ |
36 | #ifndef LIBC_mips32_ATOMIC_H_ |
| 37 | #define LIBC_mips32_ATOMIC_H_ |
37 | #define LIBC_mips32_ATOMIC_H_ |
| 38 | 38 | ||
| 39 | #define atomic_inc(x) ((void) atomic_add(x, 1)) |
39 | #define atomic_inc(x) ((void) atomic_add(x, 1)) |
| 40 | #define atomic_dec(x) ((void) atomic_add(x, -1)) |
40 | #define atomic_dec(x) ((void) atomic_add(x, -1)) |
| 41 | 41 | ||
| 42 | #define atomic_postinc(x) (atomic_add(x, 1) - 1) |
42 | #define atomic_postinc(x) (atomic_add(x, 1) - 1) |
| 43 | #define atomic_postdec(x) (atomic_add(x, -1) + 1) |
43 | #define atomic_postdec(x) (atomic_add(x, -1) + 1) |
| 44 | 44 | ||
| 45 | #define atomic_preinc(x) atomic_add(x, 1) |
45 | #define atomic_preinc(x) atomic_add(x, 1) |
| 46 | #define atomic_predec(x) atomic_add(x, -1) |
46 | #define atomic_predec(x) atomic_add(x, -1) |
| 47 | 47 | ||
| 48 | /* Atomic addition of immediate value. |
48 | /* Atomic addition of immediate value. |
| 49 | * |
49 | * |
| 50 | * @param val Memory location to which will be the immediate value added. |
50 | * @param val Memory location to which will be the immediate value added. |
| 51 | * @param i Signed immediate that will be added to *val. |
51 | * @param i Signed immediate that will be added to *val. |
| 52 | * |
52 | * |
| 53 | * @return Value after addition. |
53 | * @return Value after addition. |
| 54 | */ |
54 | */ |
| 55 | static inline long atomic_add(atomic_t *val, int i) |
55 | static inline long atomic_add(atomic_t *val, int i) |
| 56 | { |
56 | { |
| 57 | long tmp, v; |
57 | long tmp, v; |
| 58 | 58 | ||
| 59 | asm volatile ( |
59 | asm volatile ( |
| 60 | "1:\n" |
60 | "1:\n" |
| 61 | " ll %0, %1\n" |
61 | " ll %0, %1\n" |
| 62 | " addiu %0, %0, %3\n" /* same as addi, but never traps on overflow */ |
62 | " addu %0, %0, %3\n" /* same as add, but never traps on overflow */ |
| 63 | " move %2, %0\n" |
63 | " move %2, %0\n" |
| 64 | " sc %0, %1\n" |
64 | " sc %0, %1\n" |
| 65 | " beq %0, %4, 1b\n" /* if the atomic operation failed, try again */ |
65 | " beq %0, %4, 1b\n" /* if the atomic operation failed, try again */ |
| 66 | /* nop */ /* nop is inserted automatically by compiler */ |
66 | /* nop */ /* nop is inserted automatically by compiler */ |
| - | 67 | " nop\n" |
|
| 67 | : "=&r" (tmp), "+m" (val->count), "=&r" (v) |
68 | : "=&r" (tmp), "+m" (val->count), "=&r" (v) |
| 68 | : "i" (i), "i" (0) |
69 | : "r" (i), "i" (0) |
| 69 | ); |
70 | ); |
| 70 | 71 | ||
| 71 | return v; |
72 | return v; |
| 72 | } |
73 | } |
| 73 | 74 | ||
| 74 | #endif |
75 | #endif |
| 75 | 76 | ||
| 76 | /** @} |
77 | /** @} |
| 77 | */ |
78 | */ |
| 78 | 79 | ||