Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Remote target system call support. |
7b6bb8da | 2 | Copyright 1997, 1998, 2002, 2004, 2007, 2008, 2009, 2010, 2011 |
e4d013fc | 3 | Free Software Foundation, Inc. |
c906108c SS |
4 | Contributed by Cygnus Solutions. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
4744ac1b | 10 | the Free Software Foundation; either version 3 of the License, or |
c906108c SS |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
4744ac1b | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | /* This interface isn't intended to be specific to any particular kind | |
22 | of remote (hardware, simulator, whatever). As such, support for it | |
23 | (e.g. sim/common/callback.c) should *not* live in the simulator source | |
24 | tree, nor should it live in the gdb source tree. K&R C must be | |
25 | supported. */ | |
26 | ||
27 | #ifdef HAVE_CONFIG_H | |
41ee5402 | 28 | #include "cconfig.h" |
c906108c SS |
29 | #endif |
30 | #include "ansidecl.h" | |
31 | #include "libiberty.h" | |
c906108c | 32 | #include <stdarg.h> |
c906108c SS |
33 | #include <stdio.h> |
34 | #ifdef HAVE_STDLIB_H | |
35 | #include <stdlib.h> | |
36 | #endif | |
027e2a04 HPN |
37 | #ifdef HAVE_STRING_H |
38 | #include <string.h> | |
39 | #elif defined (HAVE_STRINGS_H) | |
40 | #include <strings.h> | |
41 | #endif | |
c906108c SS |
42 | #ifdef HAVE_UNISTD_H |
43 | #include <unistd.h> | |
44 | #endif | |
45 | #include <errno.h> | |
46 | #include <fcntl.h> | |
47 | #include <time.h> | |
48 | #include <sys/types.h> | |
49 | #include <sys/stat.h> | |
3c25f8c7 | 50 | #include "gdb/callback.h" |
c906108c SS |
51 | #include "targ-vals.h" |
52 | ||
53 | #ifndef ENOSYS | |
54 | #define ENOSYS EINVAL | |
55 | #endif | |
56 | #ifndef ENAMETOOLONG | |
57 | #define ENAMETOOLONG EINVAL | |
58 | #endif | |
59 | ||
60 | /* Maximum length of a path name. */ | |
61 | #ifndef MAX_PATH_LEN | |
62 | #define MAX_PATH_LEN 1024 | |
63 | #endif | |
64 | ||
65 | /* When doing file read/writes, do this many bytes at a time. */ | |
66 | #define FILE_XFR_SIZE 4096 | |
67 | ||
68 | /* FIXME: for now, need to consider target word size. */ | |
69 | #define TWORD long | |
70 | #define TADDR unsigned long | |
71 | ||
027e2a04 HPN |
72 | /* Path to be prepended to syscalls with absolute paths, and to be |
73 | chdir:ed at startup, if not empty. */ | |
74 | char *simulator_sysroot = ""; | |
75 | ||
c906108c SS |
76 | /* Utility of cb_syscall to fetch a path name or other string from the target. |
77 | The result is 0 for success or a host errno value. */ | |
78 | ||
71712327 MF |
79 | int |
80 | cb_get_string (cb, sc, buf, buflen, addr) | |
c906108c SS |
81 | host_callback *cb; |
82 | CB_SYSCALL *sc; | |
83 | char *buf; | |
84 | int buflen; | |
85 | TADDR addr; | |
86 | { | |
87 | char *p, *pend; | |
88 | ||
89 | for (p = buf, pend = buf + buflen; p < pend; ++p, ++addr) | |
90 | { | |
91 | /* No, it isn't expected that this would cause one transaction with | |
92 | the remote target for each byte. The target could send the | |
93 | path name along with the syscall request, and cache the file | |
94 | name somewhere (or otherwise tweak this as desired). */ | |
95 | unsigned int count = (*sc->read_mem) (cb, sc, addr, p, 1); | |
028f6515 | 96 | |
c906108c SS |
97 | if (count != 1) |
98 | return EINVAL; | |
99 | if (*p == 0) | |
100 | break; | |
101 | } | |
102 | if (p == pend) | |
103 | return ENAMETOOLONG; | |
104 | return 0; | |
105 | } | |
106 | ||
107 | /* Utility of cb_syscall to fetch a path name. | |
108 | The buffer is malloc'd and the address is stored in BUFP. | |
027e2a04 HPN |
109 | The result is that of get_string, but prepended with |
110 | simulator_sysroot if the string starts with '/'. | |
c906108c SS |
111 | If an error occurs, no buffer is left malloc'd. */ |
112 | ||
113 | static int | |
114 | get_path (cb, sc, addr, bufp) | |
115 | host_callback *cb; | |
116 | CB_SYSCALL *sc; | |
117 | TADDR addr; | |
118 | char **bufp; | |
119 | { | |
120 | char *buf = xmalloc (MAX_PATH_LEN); | |
121 | int result; | |
027e2a04 | 122 | int sysroot_len = strlen (simulator_sysroot); |
c906108c | 123 | |
71712327 | 124 | result = cb_get_string (cb, sc, buf, MAX_PATH_LEN - sysroot_len, addr); |
c906108c | 125 | if (result == 0) |
027e2a04 HPN |
126 | { |
127 | /* Prepend absolute paths with simulator_sysroot. Relative paths | |
128 | are supposed to be relative to a chdir within that path, but at | |
129 | this point unknown where. */ | |
130 | if (simulator_sysroot[0] != '\0' && *buf == '/') | |
131 | { | |
132 | /* Considering expected rareness of syscalls with absolute | |
133 | file paths (compared to relative file paths and insn | |
134 | execution), it does not seem worthwhile to rearrange things | |
135 | to get rid of the string moves here; we'd need at least an | |
136 | extra call to check the initial '/' in the path. */ | |
137 | memmove (buf + sysroot_len, buf, sysroot_len); | |
138 | memcpy (buf, simulator_sysroot, sysroot_len); | |
139 | } | |
140 | ||
141 | *bufp = buf; | |
142 | } | |
c906108c SS |
143 | else |
144 | free (buf); | |
145 | return result; | |
146 | } | |
147 | ||
148 | /* Perform a system call on behalf of the target. */ | |
149 | ||
150 | CB_RC | |
151 | cb_syscall (cb, sc) | |
152 | host_callback *cb; | |
153 | CB_SYSCALL *sc; | |
154 | { | |
155 | TWORD result = 0, errcode = 0; | |
156 | ||
157 | if (sc->magic != CB_SYSCALL_MAGIC) | |
158 | abort (); | |
159 | ||
160 | switch (cb_target_to_host_syscall (cb, sc->func)) | |
161 | { | |
162 | #if 0 /* FIXME: wip */ | |
163 | case CB_SYS_argvlen : | |
164 | { | |
165 | /* Compute how much space is required to store the argv,envp | |
166 | strings so that the program can allocate the space and then | |
167 | call SYS_argv to fetch the values. */ | |
168 | int addr_size = cb->addr_size; | |
169 | int argc,envc,arglen,envlen; | |
170 | const char **argv = cb->init_argv; | |
171 | const char **envp = cb->init_envp; | |
172 | ||
173 | argc = arglen = 0; | |
174 | if (argv) | |
175 | { | |
176 | for ( ; argv[argc]; ++argc) | |
177 | arglen += strlen (argv[argc]) + 1; | |
178 | } | |
179 | envc = envlen = 0; | |
180 | if (envp) | |
181 | { | |
182 | for ( ; envp[envc]; ++envc) | |
183 | envlen += strlen (envp[envc]) + 1; | |
184 | } | |
185 | result = arglen + envlen; | |
186 | break; | |
187 | } | |
188 | ||
189 | case CB_SYS_argv : | |
190 | { | |
191 | /* Pointer to target's buffer. */ | |
192 | TADDR tbuf = sc->arg1; | |
193 | /* Buffer size. */ | |
194 | int bufsize = sc->arg2; | |
195 | /* Q is the target address of where all the strings go. */ | |
196 | TADDR q; | |
197 | int word_size = cb->word_size; | |
198 | int i,argc,envc,len; | |
199 | const char **argv = cb->init_argv; | |
200 | const char **envp = cb->init_envp; | |
201 | ||
202 | argc = 0; | |
203 | if (argv) | |
204 | { | |
205 | for ( ; argv[argc]; ++argc) | |
206 | { | |
207 | int len = strlen (argv[argc]); | |
208 | int written = (*sc->write_mem) (cb, sc, tbuf, argv[argc], len + 1); | |
209 | if (written != len) | |
210 | { | |
211 | result = -1; | |
212 | errcode = EINVAL; | |
213 | goto FinishSyscall; | |
214 | } | |
215 | tbuf = len + 1; | |
216 | } | |
217 | } | |
218 | if ((*sc->write_mem) (cb, sc, tbuf, "", 1) != 1) | |
219 | { | |
220 | result = -1; | |
221 | errcode = EINVAL; | |
222 | goto FinishSyscall; | |
223 | } | |
224 | tbuf++; | |
225 | envc = 0; | |
226 | if (envp) | |
227 | { | |
228 | for ( ; envp[envc]; ++envc) | |
229 | { | |
230 | int len = strlen (envp[envc]); | |
231 | int written = (*sc->write_mem) (cb, sc, tbuf, envp[envc], len + 1); | |
232 | if (written != len) | |
233 | { | |
234 | result = -1; | |
235 | errcode = EINVAL; | |
236 | goto FinishSyscall; | |
237 | } | |
238 | tbuf = len + 1; | |
239 | } | |
240 | } | |
241 | if ((*sc->write_mem) (cb, sc, tbuf, "", 1) != 1) | |
242 | { | |
243 | result = -1; | |
244 | errcode = EINVAL; | |
245 | goto FinishSyscall; | |
246 | } | |
247 | result = argc; | |
248 | sc->result2 = envc; | |
249 | break; | |
250 | } | |
251 | #endif /* wip */ | |
252 | ||
253 | case CB_SYS_exit : | |
254 | /* Caller must catch and handle. */ | |
255 | break; | |
256 | ||
257 | case CB_SYS_open : | |
258 | { | |
259 | char *path; | |
260 | ||
261 | errcode = get_path (cb, sc, sc->arg1, &path); | |
262 | if (errcode != 0) | |
263 | { | |
264 | result = -1; | |
265 | goto FinishSyscall; | |
266 | } | |
267 | result = (*cb->open) (cb, path, sc->arg2 /*, sc->arg3*/); | |
268 | free (path); | |
269 | if (result < 0) | |
270 | goto ErrorFinish; | |
271 | } | |
272 | break; | |
273 | ||
274 | case CB_SYS_close : | |
275 | result = (*cb->close) (cb, sc->arg1); | |
276 | if (result < 0) | |
277 | goto ErrorFinish; | |
278 | break; | |
279 | ||
280 | case CB_SYS_read : | |
281 | { | |
282 | /* ??? Perfect handling of error conditions may require only one | |
283 | call to cb->read. One can't assume all the data is | |
284 | contiguously stored in host memory so that would require | |
285 | malloc'ing/free'ing the space. Maybe later. */ | |
286 | char buf[FILE_XFR_SIZE]; | |
287 | int fd = sc->arg1; | |
288 | TADDR addr = sc->arg2; | |
289 | size_t count = sc->arg3; | |
290 | size_t bytes_read = 0; | |
291 | int bytes_written; | |
292 | ||
293 | while (count > 0) | |
294 | { | |
b981d709 | 295 | if (cb_is_stdin (cb, fd)) |
c906108c SS |
296 | result = (int) (*cb->read_stdin) (cb, buf, |
297 | (count < FILE_XFR_SIZE | |
298 | ? count : FILE_XFR_SIZE)); | |
299 | else | |
300 | result = (int) (*cb->read) (cb, fd, buf, | |
301 | (count < FILE_XFR_SIZE | |
302 | ? count : FILE_XFR_SIZE)); | |
303 | if (result == -1) | |
304 | goto ErrorFinish; | |
305 | if (result == 0) /* EOF */ | |
306 | break; | |
307 | bytes_written = (*sc->write_mem) (cb, sc, addr, buf, result); | |
308 | if (bytes_written != result) | |
309 | { | |
310 | result = -1; | |
311 | errcode = EINVAL; | |
312 | goto FinishSyscall; | |
313 | } | |
314 | bytes_read += result; | |
315 | count -= result; | |
316 | addr += result; | |
317 | /* If this is a short read, don't go back for more */ | |
318 | if (result != FILE_XFR_SIZE) | |
319 | break; | |
320 | } | |
321 | result = bytes_read; | |
322 | } | |
323 | break; | |
324 | ||
325 | case CB_SYS_write : | |
326 | { | |
327 | /* ??? Perfect handling of error conditions may require only one | |
328 | call to cb->write. One can't assume all the data is | |
329 | contiguously stored in host memory so that would require | |
330 | malloc'ing/free'ing the space. Maybe later. */ | |
331 | char buf[FILE_XFR_SIZE]; | |
332 | int fd = sc->arg1; | |
333 | TADDR addr = sc->arg2; | |
334 | size_t count = sc->arg3; | |
335 | int bytes_read; | |
336 | size_t bytes_written = 0; | |
337 | ||
338 | while (count > 0) | |
339 | { | |
340 | int bytes_to_read = count < FILE_XFR_SIZE ? count : FILE_XFR_SIZE; | |
341 | bytes_read = (*sc->read_mem) (cb, sc, addr, buf, bytes_to_read); | |
342 | if (bytes_read != bytes_to_read) | |
343 | { | |
344 | result = -1; | |
345 | errcode = EINVAL; | |
346 | goto FinishSyscall; | |
347 | } | |
34b47c38 | 348 | if (cb_is_stdout (cb, fd)) |
c906108c SS |
349 | { |
350 | result = (int) (*cb->write_stdout) (cb, buf, bytes_read); | |
351 | (*cb->flush_stdout) (cb); | |
352 | } | |
34b47c38 | 353 | else if (cb_is_stderr (cb, fd)) |
c906108c SS |
354 | { |
355 | result = (int) (*cb->write_stderr) (cb, buf, bytes_read); | |
356 | (*cb->flush_stderr) (cb); | |
357 | } | |
358 | else | |
359 | result = (int) (*cb->write) (cb, fd, buf, bytes_read); | |
360 | if (result == -1) | |
361 | goto ErrorFinish; | |
362 | bytes_written += result; | |
363 | count -= result; | |
364 | addr += result; | |
365 | } | |
366 | result = bytes_written; | |
367 | } | |
368 | break; | |
369 | ||
370 | case CB_SYS_lseek : | |
371 | { | |
372 | int fd = sc->arg1; | |
373 | unsigned long offset = sc->arg2; | |
374 | int whence = sc->arg3; | |
375 | ||
376 | result = (*cb->lseek) (cb, fd, offset, whence); | |
377 | if (result < 0) | |
378 | goto ErrorFinish; | |
379 | } | |
380 | break; | |
381 | ||
382 | case CB_SYS_unlink : | |
383 | { | |
384 | char *path; | |
385 | ||
386 | errcode = get_path (cb, sc, sc->arg1, &path); | |
387 | if (errcode != 0) | |
388 | { | |
389 | result = -1; | |
390 | goto FinishSyscall; | |
391 | } | |
392 | result = (*cb->unlink) (cb, path); | |
393 | free (path); | |
394 | if (result < 0) | |
395 | goto ErrorFinish; | |
396 | } | |
397 | break; | |
398 | ||
5d945fec HPN |
399 | case CB_SYS_truncate : |
400 | { | |
401 | char *path; | |
402 | long len = sc->arg2; | |
403 | ||
404 | errcode = get_path (cb, sc, sc->arg1, &path); | |
405 | if (errcode != 0) | |
406 | { | |
407 | result = -1; | |
408 | errcode = EFAULT; | |
409 | goto FinishSyscall; | |
410 | } | |
411 | result = (*cb->truncate) (cb, path, len); | |
412 | free (path); | |
413 | if (result < 0) | |
414 | goto ErrorFinish; | |
415 | } | |
416 | break; | |
417 | ||
418 | case CB_SYS_ftruncate : | |
419 | { | |
420 | int fd = sc->arg1; | |
421 | long len = sc->arg2; | |
422 | ||
423 | result = (*cb->ftruncate) (cb, fd, len); | |
424 | if (result < 0) | |
425 | goto ErrorFinish; | |
426 | } | |
427 | break; | |
428 | ||
82571856 HPN |
429 | case CB_SYS_rename : |
430 | { | |
431 | char *path1, *path2; | |
432 | ||
433 | errcode = get_path (cb, sc, sc->arg1, &path1); | |
434 | if (errcode != 0) | |
435 | { | |
436 | result = -1; | |
437 | errcode = EFAULT; | |
438 | goto FinishSyscall; | |
439 | } | |
440 | errcode = get_path (cb, sc, sc->arg2, &path2); | |
441 | if (errcode != 0) | |
442 | { | |
443 | result = -1; | |
444 | errcode = EFAULT; | |
445 | free (path1); | |
446 | goto FinishSyscall; | |
447 | } | |
448 | result = (*cb->rename) (cb, path1, path2); | |
449 | free (path1); | |
450 | free (path2); | |
451 | if (result < 0) | |
452 | goto ErrorFinish; | |
453 | } | |
454 | break; | |
455 | ||
c906108c SS |
456 | case CB_SYS_stat : |
457 | { | |
458 | char *path,*buf; | |
459 | int buflen; | |
460 | struct stat statbuf; | |
461 | TADDR addr = sc->arg2; | |
462 | ||
463 | errcode = get_path (cb, sc, sc->arg1, &path); | |
464 | if (errcode != 0) | |
465 | { | |
466 | result = -1; | |
467 | goto FinishSyscall; | |
468 | } | |
469 | result = (*cb->stat) (cb, path, &statbuf); | |
470 | free (path); | |
471 | if (result < 0) | |
472 | goto ErrorFinish; | |
473 | buflen = cb_host_to_target_stat (cb, NULL, NULL); | |
474 | buf = xmalloc (buflen); | |
475 | if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen) | |
476 | { | |
477 | /* The translation failed. This is due to an internal | |
478 | host program error, not the target's fault. */ | |
479 | free (buf); | |
480 | errcode = ENOSYS; | |
481 | result = -1; | |
482 | goto FinishSyscall; | |
483 | } | |
484 | if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen) | |
485 | { | |
486 | free (buf); | |
487 | errcode = EINVAL; | |
488 | result = -1; | |
489 | goto FinishSyscall; | |
490 | } | |
491 | free (buf); | |
492 | } | |
493 | break; | |
494 | ||
495 | case CB_SYS_fstat : | |
496 | { | |
497 | char *buf; | |
498 | int buflen; | |
499 | struct stat statbuf; | |
500 | TADDR addr = sc->arg2; | |
501 | ||
502 | result = (*cb->fstat) (cb, sc->arg1, &statbuf); | |
503 | if (result < 0) | |
504 | goto ErrorFinish; | |
505 | buflen = cb_host_to_target_stat (cb, NULL, NULL); | |
506 | buf = xmalloc (buflen); | |
507 | if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen) | |
508 | { | |
509 | /* The translation failed. This is due to an internal | |
510 | host program error, not the target's fault. */ | |
511 | free (buf); | |
512 | errcode = ENOSYS; | |
513 | result = -1; | |
514 | goto FinishSyscall; | |
515 | } | |
516 | if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen) | |
517 | { | |
518 | free (buf); | |
519 | errcode = EINVAL; | |
520 | result = -1; | |
521 | goto FinishSyscall; | |
522 | } | |
523 | free (buf); | |
524 | } | |
525 | break; | |
526 | ||
0d3cd463 HPN |
527 | case CB_SYS_lstat : |
528 | { | |
529 | char *path, *buf; | |
530 | int buflen; | |
531 | struct stat statbuf; | |
532 | TADDR addr = sc->arg2; | |
533 | ||
534 | errcode = get_path (cb, sc, sc->arg1, &path); | |
535 | if (errcode != 0) | |
536 | { | |
537 | result = -1; | |
538 | goto FinishSyscall; | |
539 | } | |
540 | result = (*cb->lstat) (cb, path, &statbuf); | |
541 | free (path); | |
542 | if (result < 0) | |
543 | goto ErrorFinish; | |
544 | ||
545 | buflen = cb_host_to_target_stat (cb, NULL, NULL); | |
546 | buf = xmalloc (buflen); | |
547 | if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen) | |
548 | { | |
549 | /* The translation failed. This is due to an internal | |
550 | host program error, not the target's fault. | |
551 | Unfortunately, it's hard to test this case, so there's no | |
552 | test-case for this execution path. */ | |
553 | free (buf); | |
554 | errcode = ENOSYS; | |
555 | result = -1; | |
556 | goto FinishSyscall; | |
557 | } | |
558 | ||
559 | if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen) | |
560 | { | |
561 | free (buf); | |
562 | errcode = EINVAL; | |
563 | result = -1; | |
564 | goto FinishSyscall; | |
565 | } | |
566 | ||
567 | free (buf); | |
568 | } | |
569 | break; | |
570 | ||
97f669ed HPN |
571 | case CB_SYS_pipe : |
572 | { | |
573 | int p[2]; | |
574 | char *target_p = xcalloc (1, cb->target_sizeof_int * 2); | |
575 | ||
576 | result = (*cb->pipe) (cb, p); | |
577 | if (result != 0) | |
578 | goto ErrorFinish; | |
579 | ||
580 | cb_store_target_endian (cb, target_p, cb->target_sizeof_int, p[0]); | |
581 | cb_store_target_endian (cb, target_p + cb->target_sizeof_int, | |
582 | cb->target_sizeof_int, p[1]); | |
583 | if ((*sc->write_mem) (cb, sc, sc->arg1, target_p, | |
584 | cb->target_sizeof_int * 2) | |
585 | != cb->target_sizeof_int * 2) | |
586 | { | |
587 | /* Close the pipe fd:s. */ | |
588 | (*cb->close) (cb, p[0]); | |
589 | (*cb->close) (cb, p[1]); | |
590 | errcode = EFAULT; | |
591 | result = -1; | |
592 | } | |
593 | ||
594 | free (target_p); | |
595 | } | |
596 | break; | |
597 | ||
c906108c SS |
598 | case CB_SYS_time : |
599 | { | |
600 | /* FIXME: May wish to change CB_SYS_time to something else. | |
601 | We might also want gettimeofday or times, but if system calls | |
602 | can be built on others, we can keep the number we have to support | |
603 | here down. */ | |
604 | time_t t = (*cb->time) (cb, (time_t *) 0); | |
605 | result = t; | |
606 | /* It is up to target code to process the argument to time(). */ | |
607 | } | |
608 | break; | |
609 | ||
610 | case CB_SYS_chdir : | |
611 | case CB_SYS_chmod : | |
612 | case CB_SYS_utime : | |
613 | /* fall through for now */ | |
614 | ||
615 | default : | |
616 | result = -1; | |
617 | errcode = ENOSYS; | |
618 | break; | |
619 | } | |
620 | ||
621 | FinishSyscall: | |
622 | sc->result = result; | |
623 | if (errcode == 0) | |
624 | sc->errcode = 0; | |
625 | else | |
626 | sc->errcode = cb_host_to_target_errno (cb, errcode); | |
627 | return CB_RC_OK; | |
628 | ||
629 | ErrorFinish: | |
630 | sc->result = result; | |
631 | sc->errcode = (*cb->get_errno) (cb); | |
632 | return CB_RC_OK; | |
633 | } |