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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_arm64.c
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6 Description: Thunk - Implementation for ARM64 / ARMv8 / AAPCS64
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7 License:
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8
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281
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9 Copyright (c) 2015-2018 Daniel Adler <dadler@uni-goettingen.de>,
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10 Tassilo Philipp <tphilipp@potion-studios.com>
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0
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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
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28 #include "dyncall_thunk.h"
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29
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30 /*
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31
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32 Thunk Register: x9
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33
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34 Thunk:
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35 adr x9, Thunk
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36 ldr x10, .target
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37 br x10
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38 nop
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39 .target:
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40 .xword 0
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41
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42 -- Encoded in:
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43
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44 0000000000000000 <Thunk>:
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45 0: 10000009 adr x9, 0 <Thunk>
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46 4: 5800006a ldr x10, 10 <.target>
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47 8: d61f0140 br x10
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48 c: d503201f nop
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49
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50 0000000000000010 <.target>:
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51 10: 76543210 .word 0x76543210
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52 14: fedcba98 .word 0xfedcba98
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53 */
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54
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55 void dcbInitThunk(DCThunk* p, void (*entry)())
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56 {
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57 p->code[0] = 0x10000009; // adr x9, 0
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58 p->code[1] = 0x5800006a; // ldr x9, entry
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59 p->code[2] = 0xd61f0140; // br x9
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60 p->code[3] = 0xd503201f; // nop
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61 p->entry = entry; // entry:
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62 // .xword 0
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63 }
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64
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