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annotate mem.c @ 620:9d6fed6501ba

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Fix handling of code writes for Z80 core. This seems to get things close to being back to where they were before the big refactor that broke the Z80 core. Some problems remain. Notably the sound driver in Sonic 2 is still quite broken.
author Michael Pavone <pavone@retrodev.com>
date Mon, 29 Dec 2014 23:08:39 -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 }