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comparison dyncallback/dyncall_thunk_ppc32.c @ 0:3e629dc19168

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initial from svn dyncall-1745
author Daniel Adler
date Thu, 19 Mar 2015 22:24:28 +0100
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children d0787f3b81fb
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-1:000000000000 0:3e629dc19168
1 /*
2
3 Package: dyncall
4 Library: dyncallback
5 File: dyncallback/dyncall_thunk_ppc32.c
6 Description: Thunk - Implementation for ppc32 darwin/apple
7 License:
8
9 Copyright (c) 2007-2015 Daniel Adler <dadler@uni-goettingen.de>,
10 Tassilo Philipp <tphilipp@potion-studios.com>
11
12 Permission to use, copy, modify, and distribute this software for any
13 purpose with or without fee is hereby granted, provided that the above
14 copyright notice and this permission notice appear in all copies.
15
16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
24 */
25
26
27 #include "dyncall_thunk.h"
28
29 unsigned short hi16(x) { return ( (unsigned short) (((unsigned int)x)>>16UL) ); }
30 unsigned short lo16(x) { return ( (unsigned short) ((unsigned int)x) ); }
31
32 void dcbInitThunk(DCThunk* p, void (*entry)())
33 {
34 /*
35 ppc32 thunk code:
36 lis r2 , HI16(p)
37 ori r2 , r2, LO16(p)
38 lwz r12, 20(r2)
39 mtctr r12
40 bctr
41 */
42
43 p->code_load_hi = 0x3c40U; /* lis r2, HI16(p) */
44 p->addr_self_hi = hi16(p);
45 p->code_load_lo = 0x6042U; /* ori r2, r2, LO16(p) */
46 p->addr_self_lo = lo16(p);
47 p->code_jump[0] = 0x81820014U; /* lwz r12, 20(r2) */
48 p->code_jump[1] = 0x7d8903a6U; /* mtclr r12 */
49 p->code_jump[2] = 0x4e800420U; /* bctr */
50 p->addr_entry = entry;
51 }
52