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annotate mem.c @ 95:dd3c680c618c

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Initial work on allowing dynamic branches and code in RAM plus a small fix to effective address decoding
author Mike Pavone <pavone@retrodev.com>
date Thu, 27 Dec 2012 21:19:58 -0800
parents 3e7bfde7606e
children 140af5509ce7
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1 #include <sys/mman.h>
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2 #include <stddef.h>
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3 #include <stdint.h>
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4 #include <stdlib.h>
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5 #include <unistd.h>
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6 #include "mem.h"
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8 /*
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9 void * alloc_code(size_t *size)
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10 {
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11 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
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12 return mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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13 }
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14 */
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16 /*
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17 void * alloc_code(size_t *size)
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18 {
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19 char * ret = malloc(*size);
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20 char * base = (char *)(((intptr_t)ret) & (~(PAGE_SIZE-1)));
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21 mprotect(base, (ret + *size) - base, PROT_EXEC | PROT_READ | PROT_WRITE);
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22 return ret;
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23 }
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24 */
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26 void * alloc_code(size_t *size)
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27 {
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28 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
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29 void * ret = sbrk(*size);
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30 if (ret == ((void *)-1)) {
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31 return NULL;
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32 }
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33 mprotect(ret, *size, PROT_EXEC | PROT_READ | PROT_WRITE);
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34 return ret;
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35 }