0
|
1 /*
|
|
2
|
|
3 Package: dyncall
|
|
4 Library: dyncallback
|
|
5 File: dyncallback/dyncall_thunk_sparc32.c
|
|
6 Description: Thunk - Implementation for sparc32
|
|
7 License:
|
|
8
|
281
|
9 Copyright (c) 2007-2018 Daniel Adler <dadler@uni-goettingen.de>,
|
0
|
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 void dcbInitThunk(DCThunk* p, void (*entry)())
|
|
30 {
|
155
|
31 /* example
|
|
32 ; put thunk pointer in g1
|
|
33 0: 03 00 00 00 sethi %hi(0), %g1
|
|
34 4: 82 10 60 00 or %g1, 0, %g1
|
|
35 ; use g2 for entry pointer and "call" it, b/c branch instructions can't handle 32bit addresses
|
|
36 8: 05 00 00 00 sethi %hi(0), %g2
|
|
37 12: 84 10 a0 00 or %g2, 0, %g2
|
|
38 ; jump - write link to %g0, effectively discarding it; also nop for delay slot
|
|
39 16: 81 c0 80 00 jmpl %g2, %g0
|
|
40 20: 01 00 00 00 nop
|
189
|
41 */
|
155
|
42
|
|
43 p->code[0] = 0x03000000 | ((unsigned int)p >> 10); /* sethi %hi(p), %g1 -- hi 22 bits */
|
|
44 p->code[1] = 0x82106000 | ((unsigned int)p & 0x3ff); /* or %g1, <p&0x3ff>, %g1 -- lo 10 bits */
|
|
45 p->code[2] = 0x05000000 | ((unsigned int)entry >> 10); /* sethi %hi(entry), %g2 */
|
|
46 p->code[3] = 0x8410a000 | ((unsigned int)entry & 0x3ff); /* or %g2, <entry&0x3ff>, %g2 */
|
|
47 p->code[4] = 0x81c08000; /* jmpl %g2, %g0 -- discards link addr */
|
|
48 p->code[5] = 0x01000000; /* nop */
|
0
|
49 }
|
|
50
|