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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_sysv.c
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6 Description: Thunks on PowerPC 32-bit System V ABI
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7 License:
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8
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9 Copyright (c) 2015 Daniel Adler <dadler@uni-goettingen.de>
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10
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11 Permission to use, copy, modify, and distribute this software for any
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12 purpose with or without fee is hereby granted, provided that the above
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13 copyright notice and this permission notice appear in all copies.
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14
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15 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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16 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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17 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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18 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 */
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24
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25
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26 #include "dyncall_thunk.h"
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27
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28 unsigned short hi16(x) { return ( (unsigned short) (((unsigned int)x)>>16UL) ); }
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29 unsigned short lo16(x) { return ( (unsigned short) ((unsigned int)x) ); }
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30
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31 void dcbInitThunk(DCThunk* p, void (*entry)())
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32 {
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33 /*
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34 0: 3d 60 00 00 lis r11,0
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35 4: 61 6b 00 01 ori r11,r11,1
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36 8: 81 82 00 14 lwz r12,20(r2)
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37 c: 7d 89 03 a6 mtctr r12
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38 10: 4e 80 04 20 bctr
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39 */
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40 p->code_load_hi = 0x3d60U; /* lis r11, HI16(p) */
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41 p->addr_self_hi = hi16(p);
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42 p->code_load_lo = 0x616bU; /* ori r11, r11, LO16(p) */
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43 p->addr_self_lo = lo16(p);
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44 p->code_jump[0] = 0x818b0014U; /* lwz r12, 20(r11) */
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45 p->code_jump[1] = 0x7d8903a6U; /* mtclr r12 */
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46 p->code_jump[2] = 0x4e800420U; /* bctr */
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47 p->addr_entry = entry;
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48
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49 }
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50
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