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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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143
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5 File: dyncallback/dyncall_thunk_arm32.c
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6 Description: Thunk - Implementation for ARM32 (ARM and THUMB mode)
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7 License:
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8
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412
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9 Copyright (c) 2007-2021 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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143
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27 /* Since we can mix ARM and THUMB assembly, this works for both modes */
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28
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29 #include "dyncall_thunk.h"
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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 # ARM32 (ARM mode) thunk code:
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35 .code 32
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412
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36 sub r12, r15, #8
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37 ldr r15, [r15, #-4]
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38 */
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39
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38
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40 /* This code stores a ptr to DCCallback in r12 (equals ptr to thunk, */
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41 /* which is PC (r15) minus 8, as PC points to current instruction+8. */
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42 /* Then it loads the callback 'entry' into PC. The -4 is needed, also bc */
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43 /* of the PC pointing ahead. */
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412
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44 p->code[0] = 0xe24fc008UL; /* sub r12, r15, #8 */
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45 p->code[1] = 0xe51ff004UL; /* ldr r15, [r15, #-4] */
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38
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46 p->entry = entry;
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47 }
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