7fd42181 |
1 | // vim:shiftwidth=2:expandtab |
2 | #define _GNU_SOURCE |
3 | #include <stdio.h> |
4 | #include <stdlib.h> |
5 | #include <sys/mman.h> |
6 | #include <dlfcn.h> |
7 | #include "header.h" |
8 | |
9 | #define DL |
10 | #include "override.c" |
11 | |
12 | __attribute__((constructor)) |
13 | static void ginge_init(void) |
14 | { |
15 | unsigned int lowest_segment = (unsigned int)-1; |
16 | unsigned int start, end; |
17 | int i, ret; |
18 | FILE *f; |
19 | |
20 | for (i = 0; i < ARRAY_SIZE(real_funcs_np); i++) { |
21 | *real_funcs_np[i].func_ptr = dlsym(RTLD_NEXT, real_funcs_np[i].name); |
22 | if (*real_funcs_np[i].func_ptr == NULL) { |
23 | fprintf(stderr, "dlsym %s: %s\n", real_funcs_np[i].name, dlerror()); |
24 | exit(1); |
25 | } |
26 | // dbg("%p %s\n", *real_funcs_np[i].func_ptr, real_funcs_np[i].name); |
27 | } |
28 | |
29 | f = fopen("/proc/self/maps", "r"); |
30 | if (f == NULL) { |
31 | perror("open /proc/self/maps"); |
32 | exit(1); |
33 | } |
34 | |
35 | ret = fscanf(f, "%x-%x %*s %*s %*s %*s %*s\n", &start, &end); |
36 | if (ret != 2) { |
37 | perror("parse maps"); |
38 | exit(1); |
39 | } |
40 | lowest_segment = start; |
41 | |
42 | // assume first entry lists program's text section. |
43 | // unprotect it in case we need some patching. |
44 | ret = mprotect((void *)start, end - start, PROT_READ|PROT_WRITE|PROT_EXEC); |
45 | if (ret != 0) |
46 | perror("warning: mprotect"); |
47 | |
48 | while (1) { |
49 | ret = fscanf(f, "%x-%*s %*s %*s %*s %*s %*s\n", &start); |
50 | if (ret <= 0) |
51 | break; |
52 | |
53 | if (start < lowest_segment) |
54 | lowest_segment = start; |
55 | } |
56 | |
57 | #if 0 |
58 | rewind(f); |
59 | char buff[256]; |
60 | while (fgets(buff, sizeof(buff), f)) |
61 | fputs(buff, stdout); |
62 | #endif |
63 | fclose(f); |
64 | |
65 | emu_init((void *)lowest_segment); |
66 | } |
67 | |