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ac8057a1 PM |
1 | /* |
2 | * memalign.c: Allocate an aligned memory region | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * Copyright (c) 2010-2016 Red Hat, Inc. | |
6 | * Copyright (c) 2022 Linaro Ltd | |
7 | * | |
8 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
9 | * of this software and associated documentation files (the "Software"), to deal | |
10 | * in the Software without restriction, including without limitation the rights | |
11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
12 | * copies of the Software, and to permit persons to whom the Software is | |
13 | * furnished to do so, subject to the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice shall be included in | |
16 | * all copies or substantial portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
24 | * THE SOFTWARE. | |
25 | */ | |
26 | ||
27 | #include "qemu/osdep.h" | |
5c8c714a | 28 | #include "qemu/host-utils.h" |
5df022cf | 29 | #include "qemu/memalign.h" |
5c8c714a PM |
30 | #include "trace.h" |
31 | ||
32 | void *qemu_try_memalign(size_t alignment, size_t size) | |
33 | { | |
34 | void *ptr; | |
35 | ||
36 | if (alignment < sizeof(void*)) { | |
37 | alignment = sizeof(void*); | |
38 | } else { | |
39 | g_assert(is_power_of_2(alignment)); | |
40 | } | |
41 | ||
42 | /* | |
43 | * Handling of 0 allocations varies among the different | |
44 | * platform APIs (for instance _aligned_malloc() will | |
45 | * fail) -- ensure that we always return a valid non-NULL | |
46 | * pointer that can be freed by qemu_vfree(). | |
47 | */ | |
48 | if (size == 0) { | |
49 | size++; | |
50 | } | |
51 | #if defined(CONFIG_POSIX_MEMALIGN) | |
52 | int ret; | |
53 | ret = posix_memalign(&ptr, alignment, size); | |
54 | if (ret != 0) { | |
55 | errno = ret; | |
56 | ptr = NULL; | |
57 | } | |
58 | #elif defined(CONFIG_ALIGNED_MALLOC) | |
59 | ptr = _aligned_malloc(size, alignment); | |
88454f84 | 60 | #elif defined(CONFIG_VALLOC) |
5c8c714a | 61 | ptr = valloc(size); |
88454f84 | 62 | #elif defined(CONFIG_MEMALIGN) |
5c8c714a | 63 | ptr = memalign(alignment, size); |
88454f84 PM |
64 | #else |
65 | #error No function to allocate aligned memory available | |
5c8c714a PM |
66 | #endif |
67 | trace_qemu_memalign(alignment, size, ptr); | |
68 | return ptr; | |
69 | } | |
ac8057a1 PM |
70 | |
71 | void *qemu_memalign(size_t alignment, size_t size) | |
72 | { | |
73 | void *p = qemu_try_memalign(alignment, size); | |
74 | if (p) { | |
75 | return p; | |
76 | } | |
77 | fprintf(stderr, | |
78 | "qemu_memalign: failed to allocate %zu bytes at alignment %zu: %s\n", | |
79 | size, alignment, strerror(errno)); | |
80 | abort(); | |
81 | } | |
1a11265d PM |
82 | |
83 | void qemu_vfree(void *ptr) | |
84 | { | |
85 | trace_qemu_vfree(ptr); | |
86 | #if !defined(CONFIG_POSIX_MEMALIGN) && defined(CONFIG_ALIGNED_MALLOC) | |
87 | /* Only Windows _aligned_malloc needs a special free function */ | |
88 | _aligned_free(ptr); | |
89 | #else | |
90 | free(ptr); | |
91 | #endif | |
92 | } |