Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Remote target system call support. |
9b254dd1 | 2 | Copyright 1997, 1998, 2002, 2004, 2007, 2008 Free Software Foundation, Inc. |
c906108c SS |
3 | Contributed by Cygnus Solutions. |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
4744ac1b | 9 | the Free Software Foundation; either version 3 of the License, or |
c906108c SS |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
4744ac1b | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
19 | |
20 | /* This interface isn't intended to be specific to any particular kind | |
21 | of remote (hardware, simulator, whatever). As such, support for it | |
22 | (e.g. sim/common/callback.c) should *not* live in the simulator source | |
23 | tree, nor should it live in the gdb source tree. K&R C must be | |
24 | supported. */ | |
25 | ||
26 | #ifdef HAVE_CONFIG_H | |
41ee5402 | 27 | #include "cconfig.h" |
c906108c SS |
28 | #endif |
29 | #include "ansidecl.h" | |
30 | #include "libiberty.h" | |
c906108c | 31 | #include <stdarg.h> |
c906108c SS |
32 | #include <stdio.h> |
33 | #ifdef HAVE_STDLIB_H | |
34 | #include <stdlib.h> | |
35 | #endif | |
027e2a04 HPN |
36 | #ifdef HAVE_STRING_H |
37 | #include <string.h> | |
38 | #elif defined (HAVE_STRINGS_H) | |
39 | #include <strings.h> | |
40 | #endif | |
c906108c SS |
41 | #ifdef HAVE_UNISTD_H |
42 | #include <unistd.h> | |
43 | #endif | |
44 | #include <errno.h> | |
45 | #include <fcntl.h> | |
46 | #include <time.h> | |
47 | #include <sys/types.h> | |
48 | #include <sys/stat.h> | |
3c25f8c7 | 49 | #include "gdb/callback.h" |
c906108c SS |
50 | #include "targ-vals.h" |
51 | ||
52 | #ifndef ENOSYS | |
53 | #define ENOSYS EINVAL | |
54 | #endif | |
55 | #ifndef ENAMETOOLONG | |
56 | #define ENAMETOOLONG EINVAL | |
57 | #endif | |
58 | ||
59 | /* Maximum length of a path name. */ | |
60 | #ifndef MAX_PATH_LEN | |
61 | #define MAX_PATH_LEN 1024 | |
62 | #endif | |
63 | ||
64 | /* When doing file read/writes, do this many bytes at a time. */ | |
65 | #define FILE_XFR_SIZE 4096 | |
66 | ||
67 | /* FIXME: for now, need to consider target word size. */ | |
68 | #define TWORD long | |
69 | #define TADDR unsigned long | |
70 | ||
027e2a04 HPN |
71 | /* Path to be prepended to syscalls with absolute paths, and to be |
72 | chdir:ed at startup, if not empty. */ | |
73 | char *simulator_sysroot = ""; | |
74 | ||
c906108c SS |
75 | /* Utility of cb_syscall to fetch a path name or other string from the target. |
76 | The result is 0 for success or a host errno value. */ | |
77 | ||
78 | static int | |
79 | get_string (cb, sc, buf, buflen, addr) | |
80 | host_callback *cb; | |
81 | CB_SYSCALL *sc; | |
82 | char *buf; | |
83 | int buflen; | |
84 | TADDR addr; | |
85 | { | |
86 | char *p, *pend; | |
87 | ||
88 | for (p = buf, pend = buf + buflen; p < pend; ++p, ++addr) | |
89 | { | |
90 | /* No, it isn't expected that this would cause one transaction with | |
91 | the remote target for each byte. The target could send the | |
92 | path name along with the syscall request, and cache the file | |
93 | name somewhere (or otherwise tweak this as desired). */ | |
94 | unsigned int count = (*sc->read_mem) (cb, sc, addr, p, 1); | |
95 | ||
96 | if (count != 1) | |
97 | return EINVAL; | |
98 | if (*p == 0) | |
99 | break; | |
100 | } | |
101 | if (p == pend) | |
102 | return ENAMETOOLONG; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* Utility of cb_syscall to fetch a path name. | |
107 | The buffer is malloc'd and the address is stored in BUFP. | |
027e2a04 HPN |
108 | The result is that of get_string, but prepended with |
109 | simulator_sysroot if the string starts with '/'. | |
c906108c SS |
110 | If an error occurs, no buffer is left malloc'd. */ |
111 | ||
112 | static int | |
113 | get_path (cb, sc, addr, bufp) | |
114 | host_callback *cb; | |
115 | CB_SYSCALL *sc; | |
116 | TADDR addr; | |
117 | char **bufp; | |
118 | { | |
119 | char *buf = xmalloc (MAX_PATH_LEN); | |
120 | int result; | |
027e2a04 | 121 | int sysroot_len = strlen (simulator_sysroot); |
c906108c | 122 | |
027e2a04 | 123 | result = get_string (cb, sc, buf, MAX_PATH_LEN - sysroot_len, addr); |
c906108c | 124 | if (result == 0) |
027e2a04 HPN |
125 | { |
126 | /* Prepend absolute paths with simulator_sysroot. Relative paths | |
127 | are supposed to be relative to a chdir within that path, but at | |
128 | this point unknown where. */ | |
129 | if (simulator_sysroot[0] != '\0' && *buf == '/') | |
130 | { | |
131 | /* Considering expected rareness of syscalls with absolute | |
132 | file paths (compared to relative file paths and insn | |
133 | execution), it does not seem worthwhile to rearrange things | |
134 | to get rid of the string moves here; we'd need at least an | |
135 | extra call to check the initial '/' in the path. */ | |
136 | memmove (buf + sysroot_len, buf, sysroot_len); | |
137 | memcpy (buf, simulator_sysroot, sysroot_len); | |
138 | } | |
139 | ||
140 | *bufp = buf; | |
141 | } | |
c906108c SS |
142 | else |
143 | free (buf); | |
144 | return result; | |
145 | } | |
146 | ||
147 | /* Perform a system call on behalf of the target. */ | |
148 | ||
149 | CB_RC | |
150 | cb_syscall (cb, sc) | |
151 | host_callback *cb; | |
152 | CB_SYSCALL *sc; | |
153 | { | |
154 | TWORD result = 0, errcode = 0; | |
155 | ||
156 | if (sc->magic != CB_SYSCALL_MAGIC) | |
157 | abort (); | |
158 | ||
159 | switch (cb_target_to_host_syscall (cb, sc->func)) | |
160 | { | |
161 | #if 0 /* FIXME: wip */ | |
162 | case CB_SYS_argvlen : | |
163 | { | |
164 | /* Compute how much space is required to store the argv,envp | |
165 | strings so that the program can allocate the space and then | |
166 | call SYS_argv to fetch the values. */ | |
167 | int addr_size = cb->addr_size; | |
168 | int argc,envc,arglen,envlen; | |
169 | const char **argv = cb->init_argv; | |
170 | const char **envp = cb->init_envp; | |
171 | ||
172 | argc = arglen = 0; | |
173 | if (argv) | |
174 | { | |
175 | for ( ; argv[argc]; ++argc) | |
176 | arglen += strlen (argv[argc]) + 1; | |
177 | } | |
178 | envc = envlen = 0; | |
179 | if (envp) | |
180 | { | |
181 | for ( ; envp[envc]; ++envc) | |
182 | envlen += strlen (envp[envc]) + 1; | |
183 | } | |
184 | result = arglen + envlen; | |
185 | break; | |
186 | } | |
187 | ||
188 | case CB_SYS_argv : | |
189 | { | |
190 | /* Pointer to target's buffer. */ | |
191 | TADDR tbuf = sc->arg1; | |
192 | /* Buffer size. */ | |
193 | int bufsize = sc->arg2; | |
194 | /* Q is the target address of where all the strings go. */ | |
195 | TADDR q; | |
196 | int word_size = cb->word_size; | |
197 | int i,argc,envc,len; | |
198 | const char **argv = cb->init_argv; | |
199 | const char **envp = cb->init_envp; | |
200 | ||
201 | argc = 0; | |
202 | if (argv) | |
203 | { | |
204 | for ( ; argv[argc]; ++argc) | |
205 | { | |
206 | int len = strlen (argv[argc]); | |
207 | int written = (*sc->write_mem) (cb, sc, tbuf, argv[argc], len + 1); | |
208 | if (written != len) | |
209 | { | |
210 | result = -1; | |
211 | errcode = EINVAL; | |
212 | goto FinishSyscall; | |
213 | } | |
214 | tbuf = len + 1; | |
215 | } | |
216 | } | |
217 | if ((*sc->write_mem) (cb, sc, tbuf, "", 1) != 1) | |
218 | { | |
219 | result = -1; | |
220 | errcode = EINVAL; | |
221 | goto FinishSyscall; | |
222 | } | |
223 | tbuf++; | |
224 | envc = 0; | |
225 | if (envp) | |
226 | { | |
227 | for ( ; envp[envc]; ++envc) | |
228 | { | |
229 | int len = strlen (envp[envc]); | |
230 | int written = (*sc->write_mem) (cb, sc, tbuf, envp[envc], len + 1); | |
231 | if (written != len) | |
232 | { | |
233 | result = -1; | |
234 | errcode = EINVAL; | |
235 | goto FinishSyscall; | |
236 | } | |
237 | tbuf = len + 1; | |
238 | } | |
239 | } | |
240 | if ((*sc->write_mem) (cb, sc, tbuf, "", 1) != 1) | |
241 | { | |
242 | result = -1; | |
243 | errcode = EINVAL; | |
244 | goto FinishSyscall; | |
245 | } | |
246 | result = argc; | |
247 | sc->result2 = envc; | |
248 | break; | |
249 | } | |
250 | #endif /* wip */ | |
251 | ||
252 | case CB_SYS_exit : | |
253 | /* Caller must catch and handle. */ | |
254 | break; | |
255 | ||
256 | case CB_SYS_open : | |
257 | { | |
258 | char *path; | |
259 | ||
260 | errcode = get_path (cb, sc, sc->arg1, &path); | |
261 | if (errcode != 0) | |
262 | { | |
263 | result = -1; | |
264 | goto FinishSyscall; | |
265 | } | |
266 | result = (*cb->open) (cb, path, sc->arg2 /*, sc->arg3*/); | |
267 | free (path); | |
268 | if (result < 0) | |
269 | goto ErrorFinish; | |
270 | } | |
271 | break; | |
272 | ||
273 | case CB_SYS_close : | |
274 | result = (*cb->close) (cb, sc->arg1); | |
275 | if (result < 0) | |
276 | goto ErrorFinish; | |
277 | break; | |
278 | ||
279 | case CB_SYS_read : | |
280 | { | |
281 | /* ??? Perfect handling of error conditions may require only one | |
282 | call to cb->read. One can't assume all the data is | |
283 | contiguously stored in host memory so that would require | |
284 | malloc'ing/free'ing the space. Maybe later. */ | |
285 | char buf[FILE_XFR_SIZE]; | |
286 | int fd = sc->arg1; | |
287 | TADDR addr = sc->arg2; | |
288 | size_t count = sc->arg3; | |
289 | size_t bytes_read = 0; | |
290 | int bytes_written; | |
291 | ||
292 | while (count > 0) | |
293 | { | |
b981d709 | 294 | if (cb_is_stdin (cb, fd)) |
c906108c SS |
295 | result = (int) (*cb->read_stdin) (cb, buf, |
296 | (count < FILE_XFR_SIZE | |
297 | ? count : FILE_XFR_SIZE)); | |
298 | else | |
299 | result = (int) (*cb->read) (cb, fd, buf, | |
300 | (count < FILE_XFR_SIZE | |
301 | ? count : FILE_XFR_SIZE)); | |
302 | if (result == -1) | |
303 | goto ErrorFinish; | |
304 | if (result == 0) /* EOF */ | |
305 | break; | |
306 | bytes_written = (*sc->write_mem) (cb, sc, addr, buf, result); | |
307 | if (bytes_written != result) | |
308 | { | |
309 | result = -1; | |
310 | errcode = EINVAL; | |
311 | goto FinishSyscall; | |
312 | } | |
313 | bytes_read += result; | |
314 | count -= result; | |
315 | addr += result; | |
316 | /* If this is a short read, don't go back for more */ | |
317 | if (result != FILE_XFR_SIZE) | |
318 | break; | |
319 | } | |
320 | result = bytes_read; | |
321 | } | |
322 | break; | |
323 | ||
324 | case CB_SYS_write : | |
325 | { | |
326 | /* ??? Perfect handling of error conditions may require only one | |
327 | call to cb->write. One can't assume all the data is | |
328 | contiguously stored in host memory so that would require | |
329 | malloc'ing/free'ing the space. Maybe later. */ | |
330 | char buf[FILE_XFR_SIZE]; | |
331 | int fd = sc->arg1; | |
332 | TADDR addr = sc->arg2; | |
333 | size_t count = sc->arg3; | |
334 | int bytes_read; | |
335 | size_t bytes_written = 0; | |
336 | ||
337 | while (count > 0) | |
338 | { | |
339 | int bytes_to_read = count < FILE_XFR_SIZE ? count : FILE_XFR_SIZE; | |
340 | bytes_read = (*sc->read_mem) (cb, sc, addr, buf, bytes_to_read); | |
341 | if (bytes_read != bytes_to_read) | |
342 | { | |
343 | result = -1; | |
344 | errcode = EINVAL; | |
345 | goto FinishSyscall; | |
346 | } | |
eb639c50 | 347 | if (cb_is_stdout(cb, fd)) |
c906108c SS |
348 | { |
349 | result = (int) (*cb->write_stdout) (cb, buf, bytes_read); | |
350 | (*cb->flush_stdout) (cb); | |
351 | } | |
eb639c50 | 352 | else if (cb_is_stderr(cb, fd)) |
c906108c SS |
353 | { |
354 | result = (int) (*cb->write_stderr) (cb, buf, bytes_read); | |
355 | (*cb->flush_stderr) (cb); | |
356 | } | |
357 | else | |
358 | result = (int) (*cb->write) (cb, fd, buf, bytes_read); | |
359 | if (result == -1) | |
360 | goto ErrorFinish; | |
361 | bytes_written += result; | |
362 | count -= result; | |
363 | addr += result; | |
364 | } | |
365 | result = bytes_written; | |
366 | } | |
367 | break; | |
368 | ||
369 | case CB_SYS_lseek : | |
370 | { | |
371 | int fd = sc->arg1; | |
372 | unsigned long offset = sc->arg2; | |
373 | int whence = sc->arg3; | |
374 | ||
375 | result = (*cb->lseek) (cb, fd, offset, whence); | |
376 | if (result < 0) | |
377 | goto ErrorFinish; | |
378 | } | |
379 | break; | |
380 | ||
381 | case CB_SYS_unlink : | |
382 | { | |
383 | char *path; | |
384 | ||
385 | errcode = get_path (cb, sc, sc->arg1, &path); | |
386 | if (errcode != 0) | |
387 | { | |
388 | result = -1; | |
389 | goto FinishSyscall; | |
390 | } | |
391 | result = (*cb->unlink) (cb, path); | |
392 | free (path); | |
393 | if (result < 0) | |
394 | goto ErrorFinish; | |
395 | } | |
396 | break; | |
397 | ||
5d945fec HPN |
398 | case CB_SYS_truncate : |
399 | { | |
400 | char *path; | |
401 | long len = sc->arg2; | |
402 | ||
403 | errcode = get_path (cb, sc, sc->arg1, &path); | |
404 | if (errcode != 0) | |
405 | { | |
406 | result = -1; | |
407 | errcode = EFAULT; | |
408 | goto FinishSyscall; | |
409 | } | |
410 | result = (*cb->truncate) (cb, path, len); | |
411 | free (path); | |
412 | if (result < 0) | |
413 | goto ErrorFinish; | |
414 | } | |
415 | break; | |
416 | ||
417 | case CB_SYS_ftruncate : | |
418 | { | |
419 | int fd = sc->arg1; | |
420 | long len = sc->arg2; | |
421 | ||
422 | result = (*cb->ftruncate) (cb, fd, len); | |
423 | if (result < 0) | |
424 | goto ErrorFinish; | |
425 | } | |
426 | break; | |
427 | ||
82571856 HPN |
428 | case CB_SYS_rename : |
429 | { | |
430 | char *path1, *path2; | |
431 | ||
432 | errcode = get_path (cb, sc, sc->arg1, &path1); | |
433 | if (errcode != 0) | |
434 | { | |
435 | result = -1; | |
436 | errcode = EFAULT; | |
437 | goto FinishSyscall; | |
438 | } | |
439 | errcode = get_path (cb, sc, sc->arg2, &path2); | |
440 | if (errcode != 0) | |
441 | { | |
442 | result = -1; | |
443 | errcode = EFAULT; | |
444 | free (path1); | |
445 | goto FinishSyscall; | |
446 | } | |
447 | result = (*cb->rename) (cb, path1, path2); | |
448 | free (path1); | |
449 | free (path2); | |
450 | if (result < 0) | |
451 | goto ErrorFinish; | |
452 | } | |
453 | break; | |
454 | ||
c906108c SS |
455 | case CB_SYS_stat : |
456 | { | |
457 | char *path,*buf; | |
458 | int buflen; | |
459 | struct stat statbuf; | |
460 | TADDR addr = sc->arg2; | |
461 | ||
462 | errcode = get_path (cb, sc, sc->arg1, &path); | |
463 | if (errcode != 0) | |
464 | { | |
465 | result = -1; | |
466 | goto FinishSyscall; | |
467 | } | |
468 | result = (*cb->stat) (cb, path, &statbuf); | |
469 | free (path); | |
470 | if (result < 0) | |
471 | goto ErrorFinish; | |
472 | buflen = cb_host_to_target_stat (cb, NULL, NULL); | |
473 | buf = xmalloc (buflen); | |
474 | if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen) | |
475 | { | |
476 | /* The translation failed. This is due to an internal | |
477 | host program error, not the target's fault. */ | |
478 | free (buf); | |
479 | errcode = ENOSYS; | |
480 | result = -1; | |
481 | goto FinishSyscall; | |
482 | } | |
483 | if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen) | |
484 | { | |
485 | free (buf); | |
486 | errcode = EINVAL; | |
487 | result = -1; | |
488 | goto FinishSyscall; | |
489 | } | |
490 | free (buf); | |
491 | } | |
492 | break; | |
493 | ||
494 | case CB_SYS_fstat : | |
495 | { | |
496 | char *buf; | |
497 | int buflen; | |
498 | struct stat statbuf; | |
499 | TADDR addr = sc->arg2; | |
500 | ||
501 | result = (*cb->fstat) (cb, sc->arg1, &statbuf); | |
502 | if (result < 0) | |
503 | goto ErrorFinish; | |
504 | buflen = cb_host_to_target_stat (cb, NULL, NULL); | |
505 | buf = xmalloc (buflen); | |
506 | if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen) | |
507 | { | |
508 | /* The translation failed. This is due to an internal | |
509 | host program error, not the target's fault. */ | |
510 | free (buf); | |
511 | errcode = ENOSYS; | |
512 | result = -1; | |
513 | goto FinishSyscall; | |
514 | } | |
515 | if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen) | |
516 | { | |
517 | free (buf); | |
518 | errcode = EINVAL; | |
519 | result = -1; | |
520 | goto FinishSyscall; | |
521 | } | |
522 | free (buf); | |
523 | } | |
524 | break; | |
525 | ||
0d3cd463 HPN |
526 | case CB_SYS_lstat : |
527 | { | |
528 | char *path, *buf; | |
529 | int buflen; | |
530 | struct stat statbuf; | |
531 | TADDR addr = sc->arg2; | |
532 | ||
533 | errcode = get_path (cb, sc, sc->arg1, &path); | |
534 | if (errcode != 0) | |
535 | { | |
536 | result = -1; | |
537 | goto FinishSyscall; | |
538 | } | |
539 | result = (*cb->lstat) (cb, path, &statbuf); | |
540 | free (path); | |
541 | if (result < 0) | |
542 | goto ErrorFinish; | |
543 | ||
544 | buflen = cb_host_to_target_stat (cb, NULL, NULL); | |
545 | buf = xmalloc (buflen); | |
546 | if (cb_host_to_target_stat (cb, &statbuf, buf) != buflen) | |
547 | { | |
548 | /* The translation failed. This is due to an internal | |
549 | host program error, not the target's fault. | |
550 | Unfortunately, it's hard to test this case, so there's no | |
551 | test-case for this execution path. */ | |
552 | free (buf); | |
553 | errcode = ENOSYS; | |
554 | result = -1; | |
555 | goto FinishSyscall; | |
556 | } | |
557 | ||
558 | if ((*sc->write_mem) (cb, sc, addr, buf, buflen) != buflen) | |
559 | { | |
560 | free (buf); | |
561 | errcode = EINVAL; | |
562 | result = -1; | |
563 | goto FinishSyscall; | |
564 | } | |
565 | ||
566 | free (buf); | |
567 | } | |
568 | break; | |
569 | ||
97f669ed HPN |
570 | case CB_SYS_pipe : |
571 | { | |
572 | int p[2]; | |
573 | char *target_p = xcalloc (1, cb->target_sizeof_int * 2); | |
574 | ||
575 | result = (*cb->pipe) (cb, p); | |
576 | if (result != 0) | |
577 | goto ErrorFinish; | |
578 | ||
579 | cb_store_target_endian (cb, target_p, cb->target_sizeof_int, p[0]); | |
580 | cb_store_target_endian (cb, target_p + cb->target_sizeof_int, | |
581 | cb->target_sizeof_int, p[1]); | |
582 | if ((*sc->write_mem) (cb, sc, sc->arg1, target_p, | |
583 | cb->target_sizeof_int * 2) | |
584 | != cb->target_sizeof_int * 2) | |
585 | { | |
586 | /* Close the pipe fd:s. */ | |
587 | (*cb->close) (cb, p[0]); | |
588 | (*cb->close) (cb, p[1]); | |
589 | errcode = EFAULT; | |
590 | result = -1; | |
591 | } | |
592 | ||
593 | free (target_p); | |
594 | } | |
595 | break; | |
596 | ||
c906108c SS |
597 | case CB_SYS_time : |
598 | { | |
599 | /* FIXME: May wish to change CB_SYS_time to something else. | |
600 | We might also want gettimeofday or times, but if system calls | |
601 | can be built on others, we can keep the number we have to support | |
602 | here down. */ | |
603 | time_t t = (*cb->time) (cb, (time_t *) 0); | |
604 | result = t; | |
605 | /* It is up to target code to process the argument to time(). */ | |
606 | } | |
607 | break; | |
608 | ||
609 | case CB_SYS_chdir : | |
610 | case CB_SYS_chmod : | |
611 | case CB_SYS_utime : | |
612 | /* fall through for now */ | |
613 | ||
614 | default : | |
615 | result = -1; | |
616 | errcode = ENOSYS; | |
617 | break; | |
618 | } | |
619 | ||
620 | FinishSyscall: | |
621 | sc->result = result; | |
622 | if (errcode == 0) | |
623 | sc->errcode = 0; | |
624 | else | |
625 | sc->errcode = cb_host_to_target_errno (cb, errcode); | |
626 | return CB_RC_OK; | |
627 | ||
628 | ErrorFinish: | |
629 | sc->result = result; | |
630 | sc->errcode = (*cb->get_errno) (cb); | |
631 | return CB_RC_OK; | |
632 | } |