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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_sparc32.c
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6 Description: Thunk - Implementation for sparc32
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7 License:
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8
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281
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9 Copyright (c) 2007-2018 Daniel Adler <dadler@uni-goettingen.de>,
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0
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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 void dcbInitThunk(DCThunk* p, void (*entry)())
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30 {
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155
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31 /* example
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32 ; put thunk pointer in g1
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33 0: 03 00 00 00 sethi %hi(0), %g1
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34 4: 82 10 60 00 or %g1, 0, %g1
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35 ; use g2 for entry pointer and "call" it, b/c branch instructions can't handle 32bit addresses
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36 8: 05 00 00 00 sethi %hi(0), %g2
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37 12: 84 10 a0 00 or %g2, 0, %g2
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38 ; jump - write link to %g0, effectively discarding it; also nop for delay slot
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39 16: 81 c0 80 00 jmpl %g2, %g0
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40 20: 01 00 00 00 nop
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189
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41 */
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155
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42
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43 p->code[0] = 0x03000000 | ((unsigned int)p >> 10); /* sethi %hi(p), %g1 -- hi 22 bits */
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44 p->code[1] = 0x82106000 | ((unsigned int)p & 0x3ff); /* or %g1, <p&0x3ff>, %g1 -- lo 10 bits */
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45 p->code[2] = 0x05000000 | ((unsigned int)entry >> 10); /* sethi %hi(entry), %g2 */
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46 p->code[3] = 0x8410a000 | ((unsigned int)entry & 0x3ff); /* or %g2, <entry&0x3ff>, %g2 */
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47 p->code[4] = 0x81c08000; /* jmpl %g2, %g0 -- discards link addr */
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48 p->code[5] = 0x01000000; /* nop */
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49 }
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50
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