| 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 | */ |
| 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 | |
| 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 | |
| 25 | __attribute__((constructor)) |
| 26 | static void ginge_init(void) |
| 27 | { |
| 28 | void *lowest_segments[2] = { NULL, NULL }; |
| 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 | |
| 48 | ret = fscanf(f, "%x-%x ", &start, &end); |
| 49 | if (ret != 2) { |
| 50 | perror("parse maps"); |
| 51 | exit(1); |
| 52 | } |
| 53 | lowest_segments[0] = (void *)start; |
| 54 | |
| 55 | while (1) { |
| 56 | next_line(f); |
| 57 | |
| 58 | ret = fscanf(f, "%x-%*s %*s %*s %*s %*s %*s\n", &start); |
| 59 | if (ret <= 0) |
| 60 | break; |
| 61 | |
| 62 | if (lowest_segments[0] == NULL || (void *)start < lowest_segments[0]) |
| 63 | lowest_segments[0] = (void *)start; |
| 64 | else if (lowest_segments[1] == NULL |
| 65 | && (char *)start - (char *)lowest_segments[0] > 0x800000) |
| 66 | { |
| 67 | // an offset is needed because ld-linux also |
| 68 | // tends to put stuff here |
| 69 | lowest_segments[1] = (void *)(start - 0x20000); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | #if 0 |
| 74 | rewind(f); |
| 75 | char buff[256]; |
| 76 | while (fgets(buff, sizeof(buff), f)) |
| 77 | fputs(buff, stdout); |
| 78 | #endif |
| 79 | fclose(f); |
| 80 | |
| 81 | // remove self from preload, further commands (from system() and such) |
| 82 | // will be handled by ginge_prep. |
| 83 | unsetenv("LD_PRELOAD"); |
| 84 | unsetenv("LD_LIBRARY_PATH"); |
| 85 | |
| 86 | emu_init(lowest_segments, 1); |
| 87 | } |
| 88 | |
| 89 | // vim:shiftwidth=2:expandtab |