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annotate mem.c @ 467:140af5509ce7

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Added copyright notice to source files and added GPL license text in COPYING
author Mike Pavone <pavone@retrodev.com>
date Tue, 10 Sep 2013 23:31:08 -0700
parents 3e7bfde7606e
children b52cd6854c28
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140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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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 }