Mercurial > repos > blastem
annotate mem.c @ 514:f66c78cbdcaa
Implement per-channel wave logging and primitive looping support in vgm player.
author | Michael Pavone <pavone@retrodev.com> |
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date | Fri, 07 Feb 2014 21:18:05 -0800 |
parents | 140af5509ce7 |
children | b52cd6854c28 |
rev | line source |
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1 /* |
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2 Copyright 2013 Michael Pavone |
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3 This file is part of BlastEm. |
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. |
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5 */ |
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6 #include <sys/mman.h> |
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7 #include <stddef.h> |
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8 #include <stdint.h> |
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9 #include <stdlib.h> |
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10 #include <unistd.h> |
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11 #include "mem.h" |
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12 |
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13 /* |
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14 void * alloc_code(size_t *size) |
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15 { |
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16 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); |
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17 return mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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18 } |
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19 */ |
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20 |
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21 /* |
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22 void * alloc_code(size_t *size) |
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23 { |
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24 char * ret = malloc(*size); |
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25 char * base = (char *)(((intptr_t)ret) & (~(PAGE_SIZE-1))); |
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26 mprotect(base, (ret + *size) - base, PROT_EXEC | PROT_READ | PROT_WRITE); |
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27 return ret; |
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28 } |
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29 */ |
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30 |
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31 void * alloc_code(size_t *size) |
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32 { |
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33 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); |
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34 void * ret = sbrk(*size); |
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35 if (ret == ((void *)-1)) { |
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36 return NULL; |
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37 } |
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38 mprotect(ret, *size, PROT_EXEC | PROT_READ | PROT_WRITE); |
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39 return ret; |
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40 } |