|
0
|
1 /*
|
|
|
2
|
|
|
3 Package: dyncall
|
|
|
4 Library: dyncallback
|
|
|
5 File: dyncallback/dyncall_thunk_mips.c
|
|
|
6 Description: Thunk - Implementation for MIPS
|
|
|
7 License:
|
|
|
8
|
|
|
9 Copyright (c) 2013-2015 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 #include "dyncall_thunk.h"
|
|
|
27
|
|
|
28 unsigned short hi16(x) { return ( (unsigned short) (((unsigned int)x)>>16UL) ); }
|
|
|
29 unsigned short lo16(x) { return ( (unsigned short) ((unsigned int)x) ); }
|
|
|
30
|
|
|
31 void dcbInitThunk(DCThunk* p, void (*entry)())
|
|
|
32 {
|
|
|
33 /*
|
|
|
34
|
|
|
35 Thunk Register: $t4 ($12)
|
|
|
36 According to o32abi: $t9
|
|
|
37
|
|
|
38 'The Linux/MIPS convention is that all PIC calls use t9 to hold the address of the called function.'
|
|
|
39 [See MIPS Run, p.413]
|
|
|
40
|
|
|
41 mips thunk code:
|
|
|
42 lui $t4, %hi(p)
|
|
|
43 lui $t9, %hi(entry)
|
|
|
44 ori $t9, $t9, %lo(entry)
|
|
|
45 jr $t9
|
|
|
46 ori $t4, $t4, %lo(p)
|
|
|
47
|
|
|
48 thunk.o: file format elf32-tradbigmips
|
|
|
49
|
|
|
50
|
|
|
51 Disassembly of section .text:
|
|
|
52
|
|
|
53 00000000 <thunk>:
|
|
|
54 0: 3c0c0000 lui t4,0x0
|
|
|
55 4: 3c190000 lui t9,0x0
|
|
|
56 8: 37390000 ori t9,t9,0x0
|
|
|
57 c: 03200008 jr t9
|
|
|
58 10: 00200825 move at,at
|
|
|
59 14: 358c0000 ori t4,t4,0x0
|
|
|
60 18: 00200825 move at,at
|
|
|
61 1c: 00200825 move at,at
|
|
|
62
|
|
|
63 */
|
|
|
64
|
|
|
65 #if defined(DC__Endian_BIG)
|
|
|
66
|
|
|
67 p->data[0] = 0x3c0c; p->data[1] = hi16(p); /* lui $t4, hi(p) */
|
|
|
68 p->data[2] = 0x3c19; p->data[3] = hi16(entry); /* lui $t9, hi(entry) */
|
|
|
69 p->data[4] = 0x3739; p->data[5] = lo16(entry); /* ori $t9, $t9, lo(entry) */
|
|
|
70 p->jump = 0x03200008; /* jr $t9 */
|
|
|
71 p->bddt[0] = 0x358c; p->bddt[1] = lo16(p); /* ori $t4, $t4, lo(p) - branch delay slot */
|
|
|
72
|
|
|
73 #else /* defined(DC__Endian_LITTLE) */
|
|
|
74
|
|
|
75 p->data[1] = 0x3c0c; p->data[0] = hi16(p); /* lui $t4, hi(p) */
|
|
|
76 p->data[3] = 0x3c19; p->data[2] = hi16(entry); /* lui $t9, hi(entry) */
|
|
|
77 p->data[5] = 0x3739; p->data[4] = lo16(entry); /* ori $t9, $t9, lo(entry) */
|
|
|
78 p->jump = 0x03200008; /* jr $t9 */
|
|
|
79 p->bddt[1] = 0x358c; p->bddt[0] = lo16(p); /* ori $t4, $t4, lo(p) - branch delay slot */
|
|
|
80
|
|
|
81 #endif
|
|
|
82
|
|
|
83 }
|
|
|
84
|
