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annotate mem.c @ 505:b7b7a1cab44a

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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
author Michael Pavone <pavone@retrodev.com>
date Mon, 06 Jan 2014 22:54:05 -0800
parents 140af5509ce7
children b52cd6854c28
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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 }