Mercurial > repos > blastem
annotate mem.c @ 95:dd3c680c618c
Initial work on allowing dynamic branches and code in RAM plus a small fix to effective address decoding
author | Mike Pavone <pavone@retrodev.com> |
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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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7 |
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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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15 |
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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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25 |
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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 } |