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1 | // vim:shiftwidth=2:expandtab |
2 | #include <stdio.h> |
3 | #include <stdlib.h> |
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4 | #include <stdarg.h> |
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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 | |
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153 | // 4 functions bellow are efforts to prevent gp2xmenu from being started.. |
154 | static UNUSED int w_execl(const char *path, const char *arg, ...) |
155 | { |
156 | // don't allow exec (for now) |
157 | strace("execl(%s, %s, ...) = ?\n", path, arg); |
158 | exit(0); |
159 | } |
160 | |
161 | static UNUSED int w_execlp(const char *file, const char *arg, ...) |
162 | { |
163 | strace("execlp(%s, %s, ...) = ?\n", file, arg); |
164 | exit(0); |
165 | } |
166 | |
167 | // static note: this can't safely return because of the way it's patched in |
168 | // static note2: can't be used, execve hangs? |
169 | static UNUSED int w_execve(const char *filename, char *const argv[], |
170 | char *const envp[]) |
171 | { |
172 | strace("execve(%s, %p, %p) = ?\n", filename, argv, envp); |
173 | if (filename != NULL && strstr(filename, "/gp2xmenu") != NULL) |
174 | exit(0); |
175 | return execve(filename, argv, envp); |
176 | } |
177 | |
178 | static int w_chdir(const char *path) |
179 | { |
180 | int ret; |
181 | if (path != NULL && strstr(path, "/usr/gp2x") != NULL) |
182 | ret = 0; |
183 | else |
184 | ret = chdir(path); |
185 | strace("chdir(%s) = %d\n", path, ret); |
186 | return ret; |
187 | } |
188 | |
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189 | #undef open |
190 | #undef fopen |
191 | #undef mmap |
192 | #undef read |
193 | #undef ioctl |
194 | #undef sigaction |
195 | #undef tcgetattr |
196 | #undef tcsetattr |
197 | #undef system |
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198 | #undef execl |
199 | #undef execlp |
200 | #undef execve |
201 | #undef chdir |
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202 | |
203 | #ifdef DL |
204 | |
db9191ed |
205 | #define MAKE_WRAP_SYM_N(sym) \ |
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206 | /* alias wrap symbols to real names */ \ |
db9191ed |
207 | typeof(sym) sym __attribute__((alias("w_" #sym))) |
208 | |
209 | #define MAKE_WRAP_SYM(sym) \ |
210 | MAKE_WRAP_SYM_N(sym); \ |
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211 | /* wrapper to real functions, to be set up on load */ \ |
212 | static typeof(sym) *p_real_##sym |
213 | |
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214 | // note: update symver too |
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215 | MAKE_WRAP_SYM(open); |
216 | MAKE_WRAP_SYM(fopen); |
217 | MAKE_WRAP_SYM(mmap); |
218 | MAKE_WRAP_SYM(read); |
219 | MAKE_WRAP_SYM(ioctl); |
220 | MAKE_WRAP_SYM(sigaction); |
221 | MAKE_WRAP_SYM(tcgetattr); |
222 | MAKE_WRAP_SYM(tcsetattr); |
223 | MAKE_WRAP_SYM(system); |
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224 | MAKE_WRAP_SYM_N(execl); |
225 | MAKE_WRAP_SYM_N(execlp); |
226 | MAKE_WRAP_SYM(execve); |
227 | MAKE_WRAP_SYM(chdir); |
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228 | typeof(mmap) mmap2 __attribute__((alias("w_mmap"))); |
229 | |
230 | #define REAL_FUNC_NP(name) \ |
231 | { #name, (void **)&p_real_##name } |
232 | |
233 | static const struct { |
234 | const char *name; |
235 | void **func_ptr; |
236 | } real_funcs_np[] = { |
237 | REAL_FUNC_NP(open), |
238 | REAL_FUNC_NP(fopen), |
239 | REAL_FUNC_NP(mmap), |
240 | REAL_FUNC_NP(read), |
241 | REAL_FUNC_NP(ioctl), |
242 | REAL_FUNC_NP(sigaction), |
243 | REAL_FUNC_NP(tcgetattr), |
244 | REAL_FUNC_NP(tcsetattr), |
245 | REAL_FUNC_NP(system), |
db9191ed |
246 | // exec* - skipped |
247 | REAL_FUNC_NP(execve), |
248 | REAL_FUNC_NP(chdir), |
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249 | }; |
250 | |
251 | #define open p_real_open |
252 | #define fopen p_real_fopen |
253 | #define mmap p_real_mmap |
254 | #define read p_real_read |
255 | #define ioctl p_real_ioctl |
256 | #define sigaction p_real_sigaction |
257 | #define tcgetattr p_real_tcgetattr |
258 | #define tcsetattr p_real_tcsetattr |
259 | #define system p_real_system |
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260 | #define execve p_real_execve |
261 | #define chdir p_real_chdir |
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262 | |
263 | #undef MAKE_WRAP_SYM |
264 | #undef REAL_FUNC_NP |
265 | |
266 | #endif |
267 | |
268 | // just call real funcs for static, pointer for dynamic |
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269 | int real_open(const char *pathname, int flags, ...) |
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270 | { |
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271 | va_list ap; |
272 | mode_t mode; |
273 | |
274 | va_start(ap, flags); |
275 | mode = va_arg(ap, mode_t); |
276 | va_end(ap); |
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277 | return open(pathname, flags, mode); |
278 | } |
279 | |
280 | FILE *real_fopen(const char *path, const char *mode) |
281 | { |
282 | return fopen(path, mode); |
283 | } |
284 | |
285 | void *real_mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) |
286 | { |
287 | return mmap(addr, length, prot, flags, fd, offset); |
288 | } |
289 | |
290 | int real_read(int fd, void *buf, size_t count) |
291 | { |
292 | return read(fd, buf, count); |
293 | } |
294 | |
295 | int real_ioctl(int d, int request, void *argp) |
296 | { |
297 | return ioctl(d, request, argp); |
298 | } |
299 | |
300 | int real_sigaction(int signum, const sigaction_t *act, sigaction_t *oldact) |
301 | { |
302 | return sigaction(signum, act, oldact); |
303 | } |
304 | |
305 | int real_tcgetattr(int fd, struct termios *termios_p) |
306 | { |
307 | return tcgetattr(fd, termios_p); |
308 | } |
309 | |
310 | int real_tcsetattr(int fd, int optional_actions, |
311 | const struct termios *termios_p) |
312 | { |
313 | return tcsetattr(fd, optional_actions, termios_p); |
314 | } |
315 | |
316 | int real_system(const char *command) |
317 | { |
318 | return system(command); |
319 | } |
db9191ed |
320 | |
321 | // real_exec* is missing intentionally - we don't need them |
322 | |
323 | int real_execve(const char *filename, char *const argv[], |
324 | char *const envp[]) |
325 | { |
326 | return execve(filename, argv, envp); |
327 | } |
328 | |
329 | int real_chdir(const char *path) |
330 | { |
331 | return chdir(path); |
332 | } |