499bf01c |
1 | /* |
2 | * GINGE - GINGE Is Not Gp2x Emulator |
3 | * (C) notaz, 2010-2011 |
4 | * |
5 | * This work is licensed under the MAME license, see COPYING file for details. |
6 | */ |
11913091 |
7 | #include <stdio.h> |
11913091 |
8 | |
9 | #include "header.h" |
10 | #include "sys_cacheflush.h" |
11 | |
7fd42181 |
12 | #include "override.c" |
dc90c02d |
13 | |
14 | // note: first mask must be always full for search algo |
15 | static const unsigned int sig_mask_all[] = { |
16 | 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, |
17 | 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff |
18 | }; |
0881206b |
19 | |
11913091 |
20 | static const unsigned int sig_open[] = { |
21 | 0xe59cc000, 0xe33c0000, 0x1a000003, 0xef900005 |
22 | }; |
dc90c02d |
23 | #define sig_mask_open sig_mask_all |
11913091 |
24 | |
25 | static const unsigned int sig_mmap[] = { |
26 | 0xe92d000f, 0xe1a0000d, 0xef90005a, 0xe28dd010 |
27 | }; |
dc90c02d |
28 | #define sig_mask_mmap sig_mask_all |
11913091 |
29 | |
7fd42181 |
30 | static const unsigned int sig_mmap2[] = { |
11913091 |
31 | 0xe52d5004, 0xe59d5008, 0xe52d4004, 0xe59d4008, |
32 | 0xe1b0ca05, 0x1a000006, 0xe1a05625, 0xef9000c0 |
33 | }; |
7fd42181 |
34 | #define sig_mask_mmap2 sig_mask_all |
11913091 |
35 | |
3d295a9f |
36 | static const unsigned int sig_read[] = { |
37 | 0xe59fc080, 0xe59cc000, 0xe33c0000, 0x1a000003, 0xef900003 |
38 | }; |
dc90c02d |
39 | #define sig_mask_read sig_mask_all |
3d295a9f |
40 | |
dc90c02d |
41 | static const unsigned int sig_ioctl[] = { |
42 | 0xef900036, 0xe3700a01, 0x312fff1e |
c1ffd5ba |
43 | }; |
dc90c02d |
44 | #define sig_mask_ioctl sig_mask_all |
c1ffd5ba |
45 | |
dc90c02d |
46 | static const unsigned int sig_sigaction[] = { |
47 | 0xe59f300c, 0xe3530000, 0x0a000000, 0xea000000, 0xea000000 |
48 | }; |
49 | static const unsigned int sig_mask_sigaction[] = { |
50 | 0xffffffff, 0xffffffff, 0xffffffff, 0xff000000, 0xff000000 |
51 | }; |
52 | |
db9191ed |
53 | static const unsigned int sig_execve[] = { |
54 | 0xef90000b, 0xe1a04000, 0xe3700a01 |
55 | }; |
56 | #define sig_mask_execve sig_mask_all |
57 | |
58 | static const unsigned int sig_execve2[] = { |
59 | 0xef90000b, 0xe3700a01, 0xe1a04000 |
60 | }; |
61 | #define sig_mask_execve2 sig_mask_all |
62 | |
63 | static const unsigned int sig_chdir[] = { |
64 | 0xef90000c, 0xe3700a01, 0x312fff1e, 0xea0004bb |
65 | }; |
66 | static const unsigned int sig_mask_chdir[] = { |
67 | 0xffffffff, 0xffffffff, 0xffffffff, 0xff000000 |
68 | }; |
dc90c02d |
69 | |
db9191ed |
70 | #define PATCH_(f,p) { sig_##p, sig_mask_##p, ARRAY_SIZE(sig_##p), w_##f } |
71 | #define PATCH(f) PATCH_(f,f) |
11913091 |
72 | |
73 | static const struct { |
74 | const unsigned int *sig; |
dc90c02d |
75 | const unsigned int *sig_mask; |
11913091 |
76 | size_t sig_cnt; |
77 | void *func; |
78 | } patches[] = { |
79 | PATCH(open), |
80 | PATCH(mmap), |
7fd42181 |
81 | PATCH(mmap2), // mmap2 syscall |
3d295a9f |
82 | PATCH(read), |
dc90c02d |
83 | PATCH(ioctl), |
84 | PATCH(sigaction), |
db9191ed |
85 | // PATCH_(execve, execve2), // hangs |
86 | PATCH(chdir), |
11913091 |
87 | }; |
88 | |
89 | void do_patches(void *ptr, unsigned int size) |
90 | { |
91 | int i, s; |
92 | |
93 | for (i = 0; i < ARRAY_SIZE(patches); i++) { |
94 | const unsigned int *sig = patches[i].sig; |
dc90c02d |
95 | const unsigned int *sig_mask = patches[i].sig_mask; |
11913091 |
96 | unsigned int *seg = (void *)(((long)ptr + 3) & ~3); |
97 | unsigned int *seg_end = seg + size / 4; |
98 | unsigned int sig0 = sig[0]; |
99 | |
100 | for (; seg < seg_end; seg++) { |
101 | if (*seg != sig0) |
102 | continue; |
103 | |
104 | for (s = 1; s < patches[i].sig_cnt; s++) |
dc90c02d |
105 | if ((seg[s] ^ sig[s]) & sig_mask[s]) |
11913091 |
106 | break; |
107 | |
108 | if (s == patches[i].sig_cnt) |
109 | goto found; |
110 | } |
111 | continue; |
112 | |
113 | found: |
dc90c02d |
114 | dbg(" patch #%i @ %08x\n", i, (int)seg); |
11913091 |
115 | seg[0] = 0xe59ff000; // ldr pc, [pc] |
116 | seg[1] = 0; |
117 | seg[2] = (unsigned int)patches[i].func; |
118 | } |
119 | |
120 | sys_cacheflush(ptr, (char *)ptr + size); |
121 | } |
122 | |
499bf01c |
123 | // vim:shiftwidth=2:expandtab |