| 1 | // vim:shiftwidth=2:expandtab |
| 2 | #include <stdio.h> |
| 3 | #include <stdlib.h> |
| 4 | #include <stdarg.h> |
| 5 | #include <string.h> |
| 6 | #include <sys/types.h> |
| 7 | #include <sys/stat.h> |
| 8 | #include <fcntl.h> |
| 9 | #include <sys/mman.h> |
| 10 | #include <unistd.h> |
| 11 | #include <sys/ioctl.h> |
| 12 | #include <signal.h> |
| 13 | #include <termios.h> |
| 14 | |
| 15 | #include "realfuncs.h" |
| 16 | #include "header.h" |
| 17 | |
| 18 | #if (DBG & 1) |
| 19 | #define strace printf |
| 20 | #else |
| 21 | #define strace(...) |
| 22 | #endif |
| 23 | |
| 24 | #define UNUSED __attribute__((unused)) |
| 25 | |
| 26 | static const struct dev_fd_t takeover_devs[] = { |
| 27 | { "/dev/mem", FAKEDEV_MEM }, |
| 28 | { "/dev/GPIO", FAKEDEV_GPIO }, |
| 29 | { "/dev/fb0", FAKEDEV_FB0 }, |
| 30 | { "/dev/fb/0", FAKEDEV_FB0 }, |
| 31 | { "/dev/fb1", FAKEDEV_FB1 }, |
| 32 | { "/dev/fb/1", FAKEDEV_FB1 }, |
| 33 | { "/dev/mmuhack", FAKEDEV_MMUHACK }, |
| 34 | { "/dev/tty", -1 }, // XXX hmh.. |
| 35 | { "/dev/tty0", FAKEDEV_TTY0 }, |
| 36 | }; |
| 37 | |
| 38 | static int w_open(const char *pathname, int flags, mode_t mode) |
| 39 | { |
| 40 | int i, ret; |
| 41 | |
| 42 | for (i = 0; i < ARRAY_SIZE(takeover_devs); i++) { |
| 43 | if (strcmp(pathname, takeover_devs[i].name) == 0) { |
| 44 | ret = takeover_devs[i].fd; |
| 45 | break; |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | if (i == ARRAY_SIZE(takeover_devs)) |
| 50 | ret = open(pathname, flags, mode); |
| 51 | |
| 52 | if (ret >= 0) { |
| 53 | for (i = 0; emu_interesting_fds[i].name != NULL; i++) { |
| 54 | if (strcmp(pathname, emu_interesting_fds[i].name) == 0) { |
| 55 | emu_interesting_fds[i].fd = ret; |
| 56 | break; |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | strace("open(%s) = %d\n", pathname, ret); |
| 62 | return ret; |
| 63 | } |
| 64 | |
| 65 | static void *w_mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) |
| 66 | { |
| 67 | void *ret; |
| 68 | if (FAKEDEV_MEM <= fd && fd < FAKEDEV_FD_BOUNDARY) |
| 69 | ret = emu_do_mmap(length, prot, flags, fd, offset); |
| 70 | else |
| 71 | ret = mmap(addr, length, prot, flags, fd, offset); |
| 72 | |
| 73 | // threads are using heap before they mmap their stack |
| 74 | // printf needs valid stack for pthread/errno |
| 75 | if (((long)&ret & 0xf0000000) == 0xb0000000) |
| 76 | strace("mmap(%p, %x, %x, %x, %d, %lx) = %p\n", addr, length, prot, flags, fd, (long)offset, ret); |
| 77 | return ret; |
| 78 | } |
| 79 | #define w_mmap2 w_mmap |
| 80 | |
| 81 | static ssize_t w_read(int fd, void *buf, size_t count) |
| 82 | { |
| 83 | ssize_t ret; |
| 84 | if (fd == FAKEDEV_GPIO) |
| 85 | ret = emu_read_gpiodev(buf, count); |
| 86 | else |
| 87 | ret = read(fd, buf, count); |
| 88 | |
| 89 | //strace("read(%d, %p, %d) = %d\n", fd, buf, count, ret); |
| 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | static int w_ioctl(int fd, int request, void *argp) |
| 94 | { |
| 95 | int ret; |
| 96 | |
| 97 | if ((FAKEDEV_MEM <= fd && fd < FAKEDEV_FD_BOUNDARY) || |
| 98 | fd == emu_interesting_fds[IFD_SOUND].fd) |
| 99 | ret = emu_do_ioctl(fd, request, argp); |
| 100 | else |
| 101 | ret = ioctl(fd, request, argp); |
| 102 | |
| 103 | strace("ioctl(%d, %08x, %p) = %d\n", fd, request, argp, ret); |
| 104 | return ret; |
| 105 | } |
| 106 | |
| 107 | static int w_sigaction(int signum, const void *act, void *oldact) |
| 108 | { |
| 109 | strace("sigaction(%d, %p, %p) = %d\n", signum, act, oldact, 0); |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | /* dynamic only */ |
| 114 | static UNUSED int w_tcgetattr(int fd, struct termios *termios_p) |
| 115 | { |
| 116 | int ret; |
| 117 | if (fd != FAKEDEV_TTY0) |
| 118 | ret = tcgetattr(fd, termios_p); |
| 119 | else |
| 120 | ret = 0; |
| 121 | |
| 122 | strace("tcgetattr(%d, %p) = %d\n", fd, termios_p, ret); |
| 123 | return ret; |
| 124 | } |
| 125 | |
| 126 | static UNUSED int w_tcsetattr(int fd, int optional_actions, |
| 127 | const struct termios *termios_p) |
| 128 | { |
| 129 | int ret; |
| 130 | if (fd != FAKEDEV_TTY0) |
| 131 | ret = tcsetattr(fd, optional_actions, termios_p); |
| 132 | else |
| 133 | ret = 0; |
| 134 | |
| 135 | strace("tcsetattr(%d, %x, %p) = %d\n", fd, optional_actions, termios_p, ret); |
| 136 | return ret; |
| 137 | } |
| 138 | |
| 139 | static UNUSED FILE *w_fopen(const char *path, const char *mode) |
| 140 | { |
| 141 | FILE *ret = emu_do_fopen(path, mode); |
| 142 | strace("fopen(%s, %s) = %p\n", path, mode, ret); |
| 143 | return ret; |
| 144 | } |
| 145 | |
| 146 | static UNUSED int w_system(const char *command) |
| 147 | { |
| 148 | int ret = emu_do_system(command); |
| 149 | strace("system(%s) = %d\n", command, ret); |
| 150 | return ret; |
| 151 | } |
| 152 | |
| 153 | #undef open |
| 154 | #undef fopen |
| 155 | #undef mmap |
| 156 | #undef read |
| 157 | #undef ioctl |
| 158 | #undef sigaction |
| 159 | #undef tcgetattr |
| 160 | #undef tcsetattr |
| 161 | #undef system |
| 162 | |
| 163 | #ifdef DL |
| 164 | |
| 165 | #define MAKE_WRAP_SYM(sym) \ |
| 166 | /* alias wrap symbols to real names */ \ |
| 167 | typeof(sym) sym __attribute__((alias("w_" #sym))); \ |
| 168 | /* wrapper to real functions, to be set up on load */ \ |
| 169 | static typeof(sym) *p_real_##sym |
| 170 | |
| 171 | // note: update symver too |
| 172 | MAKE_WRAP_SYM(open); |
| 173 | MAKE_WRAP_SYM(fopen); |
| 174 | MAKE_WRAP_SYM(mmap); |
| 175 | MAKE_WRAP_SYM(read); |
| 176 | MAKE_WRAP_SYM(ioctl); |
| 177 | MAKE_WRAP_SYM(sigaction); |
| 178 | MAKE_WRAP_SYM(tcgetattr); |
| 179 | MAKE_WRAP_SYM(tcsetattr); |
| 180 | MAKE_WRAP_SYM(system); |
| 181 | typeof(mmap) mmap2 __attribute__((alias("w_mmap"))); |
| 182 | |
| 183 | #define REAL_FUNC_NP(name) \ |
| 184 | { #name, (void **)&p_real_##name } |
| 185 | |
| 186 | static const struct { |
| 187 | const char *name; |
| 188 | void **func_ptr; |
| 189 | } real_funcs_np[] = { |
| 190 | REAL_FUNC_NP(open), |
| 191 | REAL_FUNC_NP(fopen), |
| 192 | REAL_FUNC_NP(mmap), |
| 193 | REAL_FUNC_NP(read), |
| 194 | REAL_FUNC_NP(ioctl), |
| 195 | REAL_FUNC_NP(sigaction), |
| 196 | REAL_FUNC_NP(tcgetattr), |
| 197 | REAL_FUNC_NP(tcsetattr), |
| 198 | REAL_FUNC_NP(system), |
| 199 | }; |
| 200 | |
| 201 | #define open p_real_open |
| 202 | #define fopen p_real_fopen |
| 203 | #define mmap p_real_mmap |
| 204 | #define read p_real_read |
| 205 | #define ioctl p_real_ioctl |
| 206 | #define sigaction p_real_sigaction |
| 207 | #define tcgetattr p_real_tcgetattr |
| 208 | #define tcsetattr p_real_tcsetattr |
| 209 | #define system p_real_system |
| 210 | |
| 211 | #undef MAKE_WRAP_SYM |
| 212 | #undef REAL_FUNC_NP |
| 213 | |
| 214 | #endif |
| 215 | |
| 216 | // just call real funcs for static, pointer for dynamic |
| 217 | int real_open(const char *pathname, int flags, ...) |
| 218 | { |
| 219 | va_list ap; |
| 220 | mode_t mode; |
| 221 | |
| 222 | va_start(ap, flags); |
| 223 | mode = va_arg(ap, mode_t); |
| 224 | va_end(ap); |
| 225 | return open(pathname, flags, mode); |
| 226 | } |
| 227 | |
| 228 | FILE *real_fopen(const char *path, const char *mode) |
| 229 | { |
| 230 | return fopen(path, mode); |
| 231 | } |
| 232 | |
| 233 | void *real_mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) |
| 234 | { |
| 235 | return mmap(addr, length, prot, flags, fd, offset); |
| 236 | } |
| 237 | |
| 238 | int real_read(int fd, void *buf, size_t count) |
| 239 | { |
| 240 | return read(fd, buf, count); |
| 241 | } |
| 242 | |
| 243 | int real_ioctl(int d, int request, void *argp) |
| 244 | { |
| 245 | return ioctl(d, request, argp); |
| 246 | } |
| 247 | |
| 248 | int real_sigaction(int signum, const sigaction_t *act, sigaction_t *oldact) |
| 249 | { |
| 250 | return sigaction(signum, act, oldact); |
| 251 | } |
| 252 | |
| 253 | int real_tcgetattr(int fd, struct termios *termios_p) |
| 254 | { |
| 255 | return tcgetattr(fd, termios_p); |
| 256 | } |
| 257 | |
| 258 | int real_tcsetattr(int fd, int optional_actions, |
| 259 | const struct termios *termios_p) |
| 260 | { |
| 261 | return tcsetattr(fd, optional_actions, termios_p); |
| 262 | } |
| 263 | |
| 264 | int real_system(const char *command) |
| 265 | { |
| 266 | return system(command); |
| 267 | } |