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 | */ |
7fd42181 |
7 | #define _GNU_SOURCE |
8 | #include <stdio.h> |
9 | #include <stdlib.h> |
10 | #include <sys/mman.h> |
11 | #include <dlfcn.h> |
12 | #include "header.h" |
13 | |
14 | #define DL |
15 | #include "override.c" |
16 | |
4d045184 |
17 | static void next_line(FILE *f) |
18 | { |
19 | int c; |
20 | do { |
21 | c = fgetc(f); |
22 | } while (c != EOF && c != '\n'); |
23 | } |
24 | |
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25 | __attribute__((constructor)) |
26 | static void ginge_init(void) |
27 | { |
28 | unsigned int lowest_segment = (unsigned int)-1; |
29 | unsigned int start, end; |
30 | int i, ret; |
31 | FILE *f; |
32 | |
33 | for (i = 0; i < ARRAY_SIZE(real_funcs_np); i++) { |
34 | *real_funcs_np[i].func_ptr = dlsym(RTLD_NEXT, real_funcs_np[i].name); |
35 | if (*real_funcs_np[i].func_ptr == NULL) { |
36 | fprintf(stderr, "dlsym %s: %s\n", real_funcs_np[i].name, dlerror()); |
37 | exit(1); |
38 | } |
39 | // dbg("%p %s\n", *real_funcs_np[i].func_ptr, real_funcs_np[i].name); |
40 | } |
41 | |
42 | f = fopen("/proc/self/maps", "r"); |
43 | if (f == NULL) { |
44 | perror("open /proc/self/maps"); |
45 | exit(1); |
46 | } |
47 | |
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48 | ret = fscanf(f, "%x-%x ", &start, &end); |
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49 | if (ret != 2) { |
50 | perror("parse maps"); |
51 | exit(1); |
52 | } |
53 | lowest_segment = start; |
54 | |
55 | // assume first entry lists program's text section. |
56 | // unprotect it in case we need some patching. |
57 | ret = mprotect((void *)start, end - start, PROT_READ|PROT_WRITE|PROT_EXEC); |
58 | if (ret != 0) |
59 | perror("warning: mprotect"); |
60 | |
61 | while (1) { |
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62 | next_line(f); |
63 | |
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64 | ret = fscanf(f, "%x-%*s %*s %*s %*s %*s %*s\n", &start); |
65 | if (ret <= 0) |
66 | break; |
67 | |
68 | if (start < lowest_segment) |
69 | lowest_segment = start; |
70 | } |
71 | |
72 | #if 0 |
73 | rewind(f); |
74 | char buff[256]; |
75 | while (fgets(buff, sizeof(buff), f)) |
76 | fputs(buff, stdout); |
77 | #endif |
78 | fclose(f); |
79 | |
4d045184 |
80 | // remove self from preload, further commands (from system() and such) |
81 | // will be handled by ginge_prep. |
82 | unsetenv("LD_PRELOAD"); |
7000b522 |
83 | unsetenv("LD_LIBRARY_PATH"); |
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84 | |
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85 | emu_init((void *)lowest_segment); |
86 | } |
87 | |
499bf01c |
88 | // vim:shiftwidth=2:expandtab |