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0
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1 /*
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2
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3 Package: dyncall
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4 Library: dyncallback
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5 File: dyncallback/dyncall_thunk_ppc32.c
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6 Description: Thunk - Implementation for ppc32 darwin/apple
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7 License:
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8
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9 Copyright (c) 2007-2015 Daniel Adler <dadler@uni-goettingen.de>,
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10 Tassilo Philipp <tphilipp@potion-studios.com>
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11
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12 Permission to use, copy, modify, and distribute this software for any
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13 purpose with or without fee is hereby granted, provided that the above
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14 copyright notice and this permission notice appear in all copies.
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15
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16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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23
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24 */
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25
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26
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27 #include "dyncall_thunk.h"
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28
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29 unsigned short hi16(x) { return ( (unsigned short) (((unsigned int)x)>>16UL) ); }
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30 unsigned short lo16(x) { return ( (unsigned short) ((unsigned int)x) ); }
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31
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32 void dcbInitThunk(DCThunk* p, void (*entry)())
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33 {
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34 /*
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35 ppc32 thunk code:
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36 lis r2 , HI16(p)
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37 ori r2 , r2, LO16(p)
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38 lwz r12, 20(r2)
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39 mtctr r12
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40 bctr
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41 */
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42
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43 p->code_load_hi = 0x3c40U; /* lis r2, HI16(p) */
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44 p->addr_self_hi = hi16(p);
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45 p->code_load_lo = 0x6042U; /* ori r2, r2, LO16(p) */
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46 p->addr_self_lo = lo16(p);
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47 p->code_jump[0] = 0x81820014U; /* lwz r12, 20(r2) */
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48 p->code_jump[1] = 0x7d8903a6U; /* mtclr r12 */
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49 p->code_jump[2] = 0x4e800420U; /* bctr */
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50 p->addr_entry = entry;
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51 }
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52
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