FreeCalypso > hg > freecalypso-sw
annotate loadagent/libnosys/sbrk.c @ 6:5eaafa83be60
loadagent: generate binary and srec images
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Mon, 29 Apr 2013 19:30:43 +0000 |
parents | da98dc08f575 |
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1 /* sbrk.c -- allocate memory dynamically. |
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2 * |
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3 * Copyright (c) 1995,1996 Cygnus Support |
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4 * |
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5 * The authors hereby grant permission to use, copy, modify, distribute, |
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6 * and license this software and its documentation for any purpose, provided |
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7 * that existing copyright notices are retained in all copies and that this |
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8 * notice is included verbatim in any distributions. No written agreement, |
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9 * license, or royalty fee is required for any of the authorized uses. |
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10 * Modifications to this software may be copyrighted by their authors |
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11 * and need not follow the licensing terms described here, provided that |
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12 * the new terms are clearly indicated on the first page of each file where |
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13 * they apply. |
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14 */ |
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15 #include <errno.h> |
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16 #include "glue.h" |
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17 |
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18 /* just in case, most boards have at least some memory */ |
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19 #ifndef RAMSIZE |
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20 # define RAMSIZE (caddr_t)0x100000 |
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21 #endif |
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22 |
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23 char *heap_ptr; |
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24 |
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25 /* |
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26 * sbrk -- changes heap size size. Get nbytes more |
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27 * RAM. We just increment a pointer in what's |
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28 * left of memory on the board. |
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29 */ |
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30 char * |
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31 _sbrk (nbytes) |
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32 int nbytes; |
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33 { |
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34 char *base; |
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35 |
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36 if (!heap_ptr) |
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37 heap_ptr = (char *)&_end; |
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38 base = heap_ptr; |
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39 heap_ptr += nbytes; |
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40 |
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41 return base; |
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42 /* FIXME: We really want to make sure we don't run out of RAM, but this |
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43 * isn't very portable. |
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44 */ |
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45 #if 0 |
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46 if ((RAMSIZE - heap_ptr - nbytes) >= 0) { |
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47 base = heap_ptr; |
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48 heap_ptr += nbytes; |
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49 return (base); |
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50 } else { |
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51 errno = ENOMEM; |
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52 return ((char *)-1); |
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53 } |
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54 #endif |
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55 } |