| 1 | /* Remote target callback routines. |
| 2 | Copyright 1995, 1996, 1997, 2000, 2002, 2003, 2004, 2007, 2008, 2009, 2010, |
| 3 | 2011 Free Software Foundation, Inc. |
| 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 |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 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 |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | /* This file provides a standard way for targets to talk to the host OS |
| 22 | level. */ |
| 23 | |
| 24 | #ifdef HAVE_CONFIG_H |
| 25 | #include "cconfig.h" |
| 26 | #endif |
| 27 | #include "ansidecl.h" |
| 28 | #include <stdarg.h> |
| 29 | #include <stdio.h> |
| 30 | #ifdef HAVE_STDLIB_H |
| 31 | #include <stdlib.h> |
| 32 | #endif |
| 33 | #ifdef HAVE_STRING_H |
| 34 | #include <string.h> |
| 35 | #else |
| 36 | #ifdef HAVE_STRINGS_H |
| 37 | #include <strings.h> |
| 38 | #endif |
| 39 | #endif |
| 40 | #ifdef HAVE_LIMITS_H |
| 41 | /* For PIPE_BUF. */ |
| 42 | #include <limits.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> |
| 49 | #include "gdb/callback.h" |
| 50 | #include "targ-vals.h" |
| 51 | /* For xmalloc. */ |
| 52 | #include "libiberty.h" |
| 53 | |
| 54 | #ifdef HAVE_UNISTD_H |
| 55 | #include <unistd.h> |
| 56 | #endif |
| 57 | |
| 58 | #ifndef PIPE_BUF |
| 59 | #define PIPE_BUF 512 |
| 60 | #endif |
| 61 | |
| 62 | /* ??? sim_cb_printf should be cb_printf, but until the callback support is |
| 63 | broken out of the simulator directory, these are here to not require |
| 64 | sim-utils.h. */ |
| 65 | void sim_cb_printf PARAMS ((host_callback *, const char *, ...)); |
| 66 | void sim_cb_eprintf PARAMS ((host_callback *, const char *, ...)); |
| 67 | |
| 68 | extern CB_TARGET_DEFS_MAP cb_init_syscall_map[]; |
| 69 | extern CB_TARGET_DEFS_MAP cb_init_errno_map[]; |
| 70 | extern CB_TARGET_DEFS_MAP cb_init_open_map[]; |
| 71 | |
| 72 | extern int system PARAMS ((const char *)); |
| 73 | |
| 74 | static int os_init PARAMS ((host_callback *)); |
| 75 | static int os_shutdown PARAMS ((host_callback *)); |
| 76 | static int os_unlink PARAMS ((host_callback *, const char *)); |
| 77 | static long os_time PARAMS ((host_callback *, long *)); |
| 78 | static int os_system PARAMS ((host_callback *, const char *)); |
| 79 | static int os_rename PARAMS ((host_callback *, const char *, const char *)); |
| 80 | static int os_write_stdout PARAMS ((host_callback *, const char *, int)); |
| 81 | static void os_flush_stdout PARAMS ((host_callback *)); |
| 82 | static int os_write_stderr PARAMS ((host_callback *, const char *, int)); |
| 83 | static void os_flush_stderr PARAMS ((host_callback *)); |
| 84 | static int os_write PARAMS ((host_callback *, int, const char *, int)); |
| 85 | static int os_read_stdin PARAMS ((host_callback *, char *, int)); |
| 86 | static int os_read PARAMS ((host_callback *, int, char *, int)); |
| 87 | static int os_open PARAMS ((host_callback *, const char *, int)); |
| 88 | static int os_lseek PARAMS ((host_callback *, int, long, int)); |
| 89 | static int os_isatty PARAMS ((host_callback *, int)); |
| 90 | static int os_get_errno PARAMS ((host_callback *)); |
| 91 | static int os_close PARAMS ((host_callback *, int)); |
| 92 | static void os_vprintf_filtered PARAMS ((host_callback *, const char *, va_list)); |
| 93 | static void os_evprintf_filtered PARAMS ((host_callback *, const char *, va_list)); |
| 94 | static void os_error PARAMS ((host_callback *, const char *, ...)) |
| 95 | #ifdef __GNUC__ |
| 96 | __attribute__ ((__noreturn__)) |
| 97 | #endif |
| 98 | ; |
| 99 | static int fdmap PARAMS ((host_callback *, int)); |
| 100 | static int fdbad PARAMS ((host_callback *, int)); |
| 101 | static int wrap PARAMS ((host_callback *, int)); |
| 102 | |
| 103 | /* Set the callback copy of errno from what we see now. */ |
| 104 | |
| 105 | static int |
| 106 | wrap (p, val) |
| 107 | host_callback *p; |
| 108 | int val; |
| 109 | { |
| 110 | p->last_errno = errno; |
| 111 | return val; |
| 112 | } |
| 113 | |
| 114 | /* Make sure the FD provided is ok. If not, return non-zero |
| 115 | and set errno. */ |
| 116 | |
| 117 | static int |
| 118 | fdbad (p, fd) |
| 119 | host_callback *p; |
| 120 | int fd; |
| 121 | { |
| 122 | if (fd < 0 || fd > MAX_CALLBACK_FDS || p->fd_buddy[fd] < 0) |
| 123 | { |
| 124 | p->last_errno = EINVAL; |
| 125 | return -1; |
| 126 | } |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | static int |
| 131 | fdmap (p, fd) |
| 132 | host_callback *p; |
| 133 | int fd; |
| 134 | { |
| 135 | return p->fdmap[fd]; |
| 136 | } |
| 137 | |
| 138 | static int |
| 139 | os_close (p, fd) |
| 140 | host_callback *p; |
| 141 | int fd; |
| 142 | { |
| 143 | int result; |
| 144 | int i, next; |
| 145 | |
| 146 | result = fdbad (p, fd); |
| 147 | if (result) |
| 148 | return result; |
| 149 | /* If this file descripter has one or more buddies (originals / |
| 150 | duplicates from a dup), just remove it from the circular list. */ |
| 151 | for (i = fd; (next = p->fd_buddy[i]) != fd; ) |
| 152 | i = next; |
| 153 | if (fd != i) |
| 154 | p->fd_buddy[i] = p->fd_buddy[fd]; |
| 155 | else |
| 156 | { |
| 157 | if (p->ispipe[fd]) |
| 158 | { |
| 159 | int other = p->ispipe[fd]; |
| 160 | int reader, writer; |
| 161 | |
| 162 | if (other > 0) |
| 163 | { |
| 164 | /* Closing the read side. */ |
| 165 | reader = fd; |
| 166 | writer = other; |
| 167 | } |
| 168 | else |
| 169 | { |
| 170 | /* Closing the write side. */ |
| 171 | writer = fd; |
| 172 | reader = -other; |
| 173 | } |
| 174 | |
| 175 | /* If there was data in the buffer, make a last "now empty" |
| 176 | call, then deallocate data. */ |
| 177 | if (p->pipe_buffer[writer].buffer != NULL) |
| 178 | { |
| 179 | (*p->pipe_empty) (p, reader, writer); |
| 180 | free (p->pipe_buffer[writer].buffer); |
| 181 | p->pipe_buffer[writer].buffer = NULL; |
| 182 | } |
| 183 | |
| 184 | /* Clear pipe data for this side. */ |
| 185 | p->pipe_buffer[fd].size = 0; |
| 186 | p->ispipe[fd] = 0; |
| 187 | |
| 188 | /* If this was the first close, mark the other side as the |
| 189 | only remaining side. */ |
| 190 | if (fd != abs (other)) |
| 191 | p->ispipe[abs (other)] = -other; |
| 192 | p->fd_buddy[fd] = -1; |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | result = wrap (p, close (fdmap (p, fd))); |
| 197 | } |
| 198 | p->fd_buddy[fd] = -1; |
| 199 | |
| 200 | return result; |
| 201 | } |
| 202 | |
| 203 | |
| 204 | /* taken from gdb/util.c:notice_quit() - should be in a library */ |
| 205 | |
| 206 | |
| 207 | #if defined(__GO32__) || defined (_MSC_VER) |
| 208 | static int |
| 209 | os_poll_quit (p) |
| 210 | host_callback *p; |
| 211 | { |
| 212 | #if defined(__GO32__) |
| 213 | int kbhit (); |
| 214 | int getkey (); |
| 215 | if (kbhit ()) |
| 216 | { |
| 217 | int k = getkey (); |
| 218 | if (k == 1) |
| 219 | { |
| 220 | return 1; |
| 221 | } |
| 222 | else if (k == 2) |
| 223 | { |
| 224 | return 1; |
| 225 | } |
| 226 | else |
| 227 | { |
| 228 | sim_cb_eprintf (p, "CTRL-A to quit, CTRL-B to quit harder\n"); |
| 229 | } |
| 230 | } |
| 231 | #endif |
| 232 | #if defined (_MSC_VER) |
| 233 | /* NB - this will not compile! */ |
| 234 | int k = win32pollquit(); |
| 235 | if (k == 1) |
| 236 | return 1; |
| 237 | else if (k == 2) |
| 238 | return 1; |
| 239 | #endif |
| 240 | return 0; |
| 241 | } |
| 242 | #else |
| 243 | #define os_poll_quit 0 |
| 244 | #endif /* defined(__GO32__) || defined(_MSC_VER) */ |
| 245 | |
| 246 | static int |
| 247 | os_get_errno (p) |
| 248 | host_callback *p; |
| 249 | { |
| 250 | return cb_host_to_target_errno (p, p->last_errno); |
| 251 | } |
| 252 | |
| 253 | |
| 254 | static int |
| 255 | os_isatty (p, fd) |
| 256 | host_callback *p; |
| 257 | int fd; |
| 258 | { |
| 259 | int result; |
| 260 | |
| 261 | result = fdbad (p, fd); |
| 262 | if (result) |
| 263 | return result; |
| 264 | result = wrap (p, isatty (fdmap (p, fd))); |
| 265 | |
| 266 | return result; |
| 267 | } |
| 268 | |
| 269 | static int |
| 270 | os_lseek (p, fd, off, way) |
| 271 | host_callback *p; |
| 272 | int fd; |
| 273 | long off; |
| 274 | int way; |
| 275 | { |
| 276 | int result; |
| 277 | |
| 278 | result = fdbad (p, fd); |
| 279 | if (result) |
| 280 | return result; |
| 281 | result = wrap (p, lseek (fdmap (p, fd), off, way)); |
| 282 | return result; |
| 283 | } |
| 284 | |
| 285 | static int |
| 286 | os_open (p, name, flags) |
| 287 | host_callback *p; |
| 288 | const char *name; |
| 289 | int flags; |
| 290 | { |
| 291 | int i; |
| 292 | for (i = 0; i < MAX_CALLBACK_FDS; i++) |
| 293 | { |
| 294 | if (p->fd_buddy[i] < 0) |
| 295 | { |
| 296 | int f = open (name, cb_target_to_host_open (p, flags), 0644); |
| 297 | if (f < 0) |
| 298 | { |
| 299 | p->last_errno = errno; |
| 300 | return f; |
| 301 | } |
| 302 | p->fd_buddy[i] = i; |
| 303 | p->fdmap[i] = f; |
| 304 | return i; |
| 305 | } |
| 306 | } |
| 307 | p->last_errno = EMFILE; |
| 308 | return -1; |
| 309 | } |
| 310 | |
| 311 | static int |
| 312 | os_read (p, fd, buf, len) |
| 313 | host_callback *p; |
| 314 | int fd; |
| 315 | char *buf; |
| 316 | int len; |
| 317 | { |
| 318 | int result; |
| 319 | |
| 320 | result = fdbad (p, fd); |
| 321 | if (result) |
| 322 | return result; |
| 323 | if (p->ispipe[fd]) |
| 324 | { |
| 325 | int writer = p->ispipe[fd]; |
| 326 | |
| 327 | /* Can't read from the write-end. */ |
| 328 | if (writer < 0) |
| 329 | { |
| 330 | p->last_errno = EBADF; |
| 331 | return -1; |
| 332 | } |
| 333 | |
| 334 | /* Nothing to read if nothing is written. */ |
| 335 | if (p->pipe_buffer[writer].size == 0) |
| 336 | return 0; |
| 337 | |
| 338 | /* Truncate read request size to buffer size minus what's already |
| 339 | read. */ |
| 340 | if (len > p->pipe_buffer[writer].size - p->pipe_buffer[fd].size) |
| 341 | len = p->pipe_buffer[writer].size - p->pipe_buffer[fd].size; |
| 342 | |
| 343 | memcpy (buf, p->pipe_buffer[writer].buffer + p->pipe_buffer[fd].size, |
| 344 | len); |
| 345 | |
| 346 | /* Account for what we just read. */ |
| 347 | p->pipe_buffer[fd].size += len; |
| 348 | |
| 349 | /* If we've read everything, empty and deallocate the buffer and |
| 350 | signal buffer-empty to client. (This isn't expected to be a |
| 351 | hot path in the simulator, so we don't hold on to the buffer.) */ |
| 352 | if (p->pipe_buffer[fd].size == p->pipe_buffer[writer].size) |
| 353 | { |
| 354 | free (p->pipe_buffer[writer].buffer); |
| 355 | p->pipe_buffer[writer].buffer = NULL; |
| 356 | p->pipe_buffer[fd].size = 0; |
| 357 | p->pipe_buffer[writer].size = 0; |
| 358 | (*p->pipe_empty) (p, fd, writer); |
| 359 | } |
| 360 | |
| 361 | return len; |
| 362 | } |
| 363 | |
| 364 | result = wrap (p, read (fdmap (p, fd), buf, len)); |
| 365 | return result; |
| 366 | } |
| 367 | |
| 368 | static int |
| 369 | os_read_stdin (p, buf, len) |
| 370 | host_callback *p; |
| 371 | char *buf; |
| 372 | int len; |
| 373 | { |
| 374 | return wrap (p, read (0, buf, len)); |
| 375 | } |
| 376 | |
| 377 | static int |
| 378 | os_write (p, fd, buf, len) |
| 379 | host_callback *p; |
| 380 | int fd; |
| 381 | const char *buf; |
| 382 | int len; |
| 383 | { |
| 384 | int result; |
| 385 | int real_fd; |
| 386 | |
| 387 | result = fdbad (p, fd); |
| 388 | if (result) |
| 389 | return result; |
| 390 | |
| 391 | if (p->ispipe[fd]) |
| 392 | { |
| 393 | int reader = -p->ispipe[fd]; |
| 394 | |
| 395 | /* Can't write to the read-end. */ |
| 396 | if (reader < 0) |
| 397 | { |
| 398 | p->last_errno = EBADF; |
| 399 | return -1; |
| 400 | } |
| 401 | |
| 402 | /* Can't write to pipe with closed read end. |
| 403 | FIXME: We should send a SIGPIPE. */ |
| 404 | if (reader == fd) |
| 405 | { |
| 406 | p->last_errno = EPIPE; |
| 407 | return -1; |
| 408 | } |
| 409 | |
| 410 | /* As a sanity-check, we bail out it the buffered contents is much |
| 411 | larger than the size of the buffer on the host. We don't want |
| 412 | to run out of memory in the simulator due to a target program |
| 413 | bug if we can help it. Unfortunately, regarding the value that |
| 414 | reaches the simulated program, it's no use returning *less* |
| 415 | than the requested amount, because cb_syscall loops calling |
| 416 | this function until the whole amount is done. */ |
| 417 | if (p->pipe_buffer[fd].size + len > 10 * PIPE_BUF) |
| 418 | { |
| 419 | p->last_errno = EFBIG; |
| 420 | return -1; |
| 421 | } |
| 422 | |
| 423 | p->pipe_buffer[fd].buffer |
| 424 | = xrealloc (p->pipe_buffer[fd].buffer, p->pipe_buffer[fd].size + len); |
| 425 | memcpy (p->pipe_buffer[fd].buffer + p->pipe_buffer[fd].size, |
| 426 | buf, len); |
| 427 | p->pipe_buffer[fd].size += len; |
| 428 | |
| 429 | (*p->pipe_nonempty) (p, reader, fd); |
| 430 | return len; |
| 431 | } |
| 432 | |
| 433 | real_fd = fdmap (p, fd); |
| 434 | switch (real_fd) |
| 435 | { |
| 436 | default: |
| 437 | result = wrap (p, write (real_fd, buf, len)); |
| 438 | break; |
| 439 | case 1: |
| 440 | result = p->write_stdout (p, buf, len); |
| 441 | break; |
| 442 | case 2: |
| 443 | result = p->write_stderr (p, buf, len); |
| 444 | break; |
| 445 | } |
| 446 | return result; |
| 447 | } |
| 448 | |
| 449 | static int |
| 450 | os_write_stdout (p, buf, len) |
| 451 | host_callback *p ATTRIBUTE_UNUSED; |
| 452 | const char *buf; |
| 453 | int len; |
| 454 | { |
| 455 | return fwrite (buf, 1, len, stdout); |
| 456 | } |
| 457 | |
| 458 | static void |
| 459 | os_flush_stdout (p) |
| 460 | host_callback *p ATTRIBUTE_UNUSED; |
| 461 | { |
| 462 | fflush (stdout); |
| 463 | } |
| 464 | |
| 465 | static int |
| 466 | os_write_stderr (p, buf, len) |
| 467 | host_callback *p ATTRIBUTE_UNUSED; |
| 468 | const char *buf; |
| 469 | int len; |
| 470 | { |
| 471 | return fwrite (buf, 1, len, stderr); |
| 472 | } |
| 473 | |
| 474 | static void |
| 475 | os_flush_stderr (p) |
| 476 | host_callback *p ATTRIBUTE_UNUSED; |
| 477 | { |
| 478 | fflush (stderr); |
| 479 | } |
| 480 | |
| 481 | static int |
| 482 | os_rename (p, f1, f2) |
| 483 | host_callback *p; |
| 484 | const char *f1; |
| 485 | const char *f2; |
| 486 | { |
| 487 | return wrap (p, rename (f1, f2)); |
| 488 | } |
| 489 | |
| 490 | |
| 491 | static int |
| 492 | os_system (p, s) |
| 493 | host_callback *p; |
| 494 | const char *s; |
| 495 | { |
| 496 | return wrap (p, system (s)); |
| 497 | } |
| 498 | |
| 499 | static long |
| 500 | os_time (p, t) |
| 501 | host_callback *p; |
| 502 | long *t; |
| 503 | { |
| 504 | return wrap (p, time (t)); |
| 505 | } |
| 506 | |
| 507 | |
| 508 | static int |
| 509 | os_unlink (p, f1) |
| 510 | host_callback *p; |
| 511 | const char *f1; |
| 512 | { |
| 513 | return wrap (p, unlink (f1)); |
| 514 | } |
| 515 | |
| 516 | static int |
| 517 | os_stat (p, file, buf) |
| 518 | host_callback *p; |
| 519 | const char *file; |
| 520 | struct stat *buf; |
| 521 | { |
| 522 | /* ??? There is an issue of when to translate to the target layout. |
| 523 | One could do that inside this function, or one could have the |
| 524 | caller do it. It's more flexible to let the caller do it, though |
| 525 | I'm not sure the flexibility will ever be useful. */ |
| 526 | return wrap (p, stat (file, buf)); |
| 527 | } |
| 528 | |
| 529 | static int |
| 530 | os_fstat (p, fd, buf) |
| 531 | host_callback *p; |
| 532 | int fd; |
| 533 | struct stat *buf; |
| 534 | { |
| 535 | if (fdbad (p, fd)) |
| 536 | return -1; |
| 537 | |
| 538 | if (p->ispipe[fd]) |
| 539 | { |
| 540 | #if defined (HAVE_STRUCT_STAT_ST_ATIME) || defined (HAVE_STRUCT_STAT_ST_CTIME) || defined (HAVE_STRUCT_STAT_ST_MTIME) |
| 541 | time_t t = (*p->time) (p, NULL); |
| 542 | #endif |
| 543 | |
| 544 | /* We have to fake the struct stat contents, since the pipe is |
| 545 | made up in the simulator. */ |
| 546 | memset (buf, 0, sizeof (*buf)); |
| 547 | |
| 548 | #ifdef HAVE_STRUCT_STAT_ST_MODE |
| 549 | buf->st_mode = S_IFIFO; |
| 550 | #endif |
| 551 | |
| 552 | /* If more accurate tracking than current-time is needed (for |
| 553 | example, on GNU/Linux we get accurate numbers), the p->time |
| 554 | callback (which may be something other than os_time) should |
| 555 | happen for each read and write, and we'd need to keep track of |
| 556 | atime, ctime and mtime. */ |
| 557 | #ifdef HAVE_STRUCT_STAT_ST_ATIME |
| 558 | buf->st_atime = t; |
| 559 | #endif |
| 560 | #ifdef HAVE_STRUCT_STAT_ST_CTIME |
| 561 | buf->st_ctime = t; |
| 562 | #endif |
| 563 | #ifdef HAVE_STRUCT_STAT_ST_MTIME |
| 564 | buf->st_mtime = t; |
| 565 | #endif |
| 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | /* ??? There is an issue of when to translate to the target layout. |
| 570 | One could do that inside this function, or one could have the |
| 571 | caller do it. It's more flexible to let the caller do it, though |
| 572 | I'm not sure the flexibility will ever be useful. */ |
| 573 | return wrap (p, fstat (fdmap (p, fd), buf)); |
| 574 | } |
| 575 | |
| 576 | static int |
| 577 | os_lstat (p, file, buf) |
| 578 | host_callback *p; |
| 579 | const char *file; |
| 580 | struct stat *buf; |
| 581 | { |
| 582 | /* NOTE: hpn/2004-12-12: Same issue here as with os_fstat. */ |
| 583 | #ifdef HAVE_LSTAT |
| 584 | return wrap (p, lstat (file, buf)); |
| 585 | #else |
| 586 | return wrap (p, stat (file, buf)); |
| 587 | #endif |
| 588 | } |
| 589 | |
| 590 | static int |
| 591 | os_ftruncate (p, fd, len) |
| 592 | host_callback *p; |
| 593 | int fd; |
| 594 | long len; |
| 595 | { |
| 596 | int result; |
| 597 | |
| 598 | result = fdbad (p, fd); |
| 599 | if (p->ispipe[fd]) |
| 600 | { |
| 601 | p->last_errno = EINVAL; |
| 602 | return -1; |
| 603 | } |
| 604 | if (result) |
| 605 | return result; |
| 606 | #ifdef HAVE_FTRUNCATE |
| 607 | result = wrap (p, ftruncate (fdmap (p, fd), len)); |
| 608 | #else |
| 609 | p->last_errno = EINVAL; |
| 610 | result = -1; |
| 611 | #endif |
| 612 | return result; |
| 613 | } |
| 614 | |
| 615 | static int |
| 616 | os_truncate (p, file, len) |
| 617 | host_callback *p; |
| 618 | const char *file; |
| 619 | long len; |
| 620 | { |
| 621 | #ifdef HAVE_TRUNCATE |
| 622 | return wrap (p, truncate (file, len)); |
| 623 | #else |
| 624 | p->last_errno = EINVAL; |
| 625 | return -1; |
| 626 | #endif |
| 627 | } |
| 628 | |
| 629 | static int |
| 630 | os_pipe (p, filedes) |
| 631 | host_callback *p; |
| 632 | int *filedes; |
| 633 | { |
| 634 | int i; |
| 635 | |
| 636 | /* We deliberately don't use fd 0. It's probably stdin anyway. */ |
| 637 | for (i = 1; i < MAX_CALLBACK_FDS; i++) |
| 638 | { |
| 639 | int j; |
| 640 | |
| 641 | if (p->fd_buddy[i] < 0) |
| 642 | for (j = i + 1; j < MAX_CALLBACK_FDS; j++) |
| 643 | if (p->fd_buddy[j] < 0) |
| 644 | { |
| 645 | /* Found two free fd:s. Set stat to allocated and mark |
| 646 | pipeness. */ |
| 647 | p->fd_buddy[i] = i; |
| 648 | p->fd_buddy[j] = j; |
| 649 | p->ispipe[i] = j; |
| 650 | p->ispipe[j] = -i; |
| 651 | filedes[0] = i; |
| 652 | filedes[1] = j; |
| 653 | |
| 654 | /* Poison the FD map to make bugs apparent. */ |
| 655 | p->fdmap[i] = -1; |
| 656 | p->fdmap[j] = -1; |
| 657 | return 0; |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | p->last_errno = EMFILE; |
| 662 | return -1; |
| 663 | } |
| 664 | |
| 665 | /* Stub functions for pipe support. They should always be overridden in |
| 666 | targets using the pipe support, but that's up to the target. */ |
| 667 | |
| 668 | /* Called when the simulator says that the pipe at (reader, writer) is |
| 669 | now empty (so the writer should leave its waiting state). */ |
| 670 | |
| 671 | static void |
| 672 | os_pipe_empty (p, reader, writer) |
| 673 | host_callback *p; |
| 674 | int reader; |
| 675 | int writer; |
| 676 | { |
| 677 | } |
| 678 | |
| 679 | /* Called when the simulator says the pipe at (reader, writer) is now |
| 680 | non-empty (so the writer should wait). */ |
| 681 | |
| 682 | static void |
| 683 | os_pipe_nonempty (p, reader, writer) |
| 684 | host_callback *p; |
| 685 | int reader; |
| 686 | int writer; |
| 687 | { |
| 688 | } |
| 689 | |
| 690 | static int |
| 691 | os_shutdown (p) |
| 692 | host_callback *p; |
| 693 | { |
| 694 | int i, next, j; |
| 695 | for (i = 0; i < MAX_CALLBACK_FDS; i++) |
| 696 | { |
| 697 | int do_close = 1; |
| 698 | |
| 699 | /* Zero out all pipe state. Don't call callbacks for non-empty |
| 700 | pipes; the target program has likely terminated at this point |
| 701 | or we're called at initialization time. */ |
| 702 | p->ispipe[i] = 0; |
| 703 | p->pipe_buffer[i].size = 0; |
| 704 | p->pipe_buffer[i].buffer = NULL; |
| 705 | |
| 706 | next = p->fd_buddy[i]; |
| 707 | if (next < 0) |
| 708 | continue; |
| 709 | do |
| 710 | { |
| 711 | j = next; |
| 712 | if (j == MAX_CALLBACK_FDS) |
| 713 | do_close = 0; |
| 714 | next = p->fd_buddy[j]; |
| 715 | p->fd_buddy[j] = -1; |
| 716 | /* At the initial call of os_init, we got -1, 0, 0, 0, ... */ |
| 717 | if (next < 0) |
| 718 | { |
| 719 | p->fd_buddy[i] = -1; |
| 720 | do_close = 0; |
| 721 | break; |
| 722 | } |
| 723 | } |
| 724 | while (j != i); |
| 725 | if (do_close) |
| 726 | close (p->fdmap[i]); |
| 727 | } |
| 728 | return 1; |
| 729 | } |
| 730 | |
| 731 | static int |
| 732 | os_init (p) |
| 733 | host_callback *p; |
| 734 | { |
| 735 | int i; |
| 736 | |
| 737 | os_shutdown (p); |
| 738 | for (i = 0; i < 3; i++) |
| 739 | { |
| 740 | p->fdmap[i] = i; |
| 741 | p->fd_buddy[i] = i - 1; |
| 742 | } |
| 743 | p->fd_buddy[0] = MAX_CALLBACK_FDS; |
| 744 | p->fd_buddy[MAX_CALLBACK_FDS] = 2; |
| 745 | |
| 746 | p->syscall_map = cb_init_syscall_map; |
| 747 | p->errno_map = cb_init_errno_map; |
| 748 | p->open_map = cb_init_open_map; |
| 749 | |
| 750 | return 1; |
| 751 | } |
| 752 | |
| 753 | /* DEPRECATED */ |
| 754 | |
| 755 | /* VARARGS */ |
| 756 | static void |
| 757 | os_printf_filtered (host_callback *p ATTRIBUTE_UNUSED, const char *format, ...) |
| 758 | { |
| 759 | va_list args; |
| 760 | va_start (args, format); |
| 761 | |
| 762 | vfprintf (stdout, format, args); |
| 763 | va_end (args); |
| 764 | } |
| 765 | |
| 766 | /* VARARGS */ |
| 767 | static void |
| 768 | os_vprintf_filtered (host_callback *p ATTRIBUTE_UNUSED, const char *format, va_list args) |
| 769 | { |
| 770 | vprintf (format, args); |
| 771 | } |
| 772 | |
| 773 | /* VARARGS */ |
| 774 | static void |
| 775 | os_evprintf_filtered (host_callback *p ATTRIBUTE_UNUSED, const char *format, va_list args) |
| 776 | { |
| 777 | vfprintf (stderr, format, args); |
| 778 | } |
| 779 | |
| 780 | /* VARARGS */ |
| 781 | static void |
| 782 | os_error (host_callback *p ATTRIBUTE_UNUSED, const char *format, ...) |
| 783 | { |
| 784 | va_list args; |
| 785 | va_start (args, format); |
| 786 | |
| 787 | vfprintf (stderr, format, args); |
| 788 | fprintf (stderr, "\n"); |
| 789 | |
| 790 | va_end (args); |
| 791 | exit (1); |
| 792 | } |
| 793 | |
| 794 | host_callback default_callback = |
| 795 | { |
| 796 | os_close, |
| 797 | os_get_errno, |
| 798 | os_isatty, |
| 799 | os_lseek, |
| 800 | os_open, |
| 801 | os_read, |
| 802 | os_read_stdin, |
| 803 | os_rename, |
| 804 | os_system, |
| 805 | os_time, |
| 806 | os_unlink, |
| 807 | os_write, |
| 808 | os_write_stdout, |
| 809 | os_flush_stdout, |
| 810 | os_write_stderr, |
| 811 | os_flush_stderr, |
| 812 | |
| 813 | os_stat, |
| 814 | os_fstat, |
| 815 | os_lstat, |
| 816 | |
| 817 | os_ftruncate, |
| 818 | os_truncate, |
| 819 | |
| 820 | os_pipe, |
| 821 | os_pipe_empty, |
| 822 | os_pipe_nonempty, |
| 823 | |
| 824 | os_poll_quit, |
| 825 | |
| 826 | os_shutdown, |
| 827 | os_init, |
| 828 | |
| 829 | os_printf_filtered, /* deprecated */ |
| 830 | |
| 831 | os_vprintf_filtered, |
| 832 | os_evprintf_filtered, |
| 833 | os_error, |
| 834 | |
| 835 | 0, /* last errno */ |
| 836 | |
| 837 | { 0, }, /* fdmap */ |
| 838 | { -1, }, /* fd_buddy */ |
| 839 | { 0, }, /* ispipe */ |
| 840 | { { 0, 0 }, }, /* pipe_buffer */ |
| 841 | |
| 842 | 0, /* syscall_map */ |
| 843 | 0, /* errno_map */ |
| 844 | 0, /* open_map */ |
| 845 | 0, /* signal_map */ |
| 846 | 0, /* stat_map */ |
| 847 | |
| 848 | /* Defaults expected to be overridden at initialization, where needed. */ |
| 849 | BFD_ENDIAN_UNKNOWN, /* target_endian */ |
| 850 | 4, /* target_sizeof_int */ |
| 851 | |
| 852 | HOST_CALLBACK_MAGIC, |
| 853 | }; |
| 854 | \f |
| 855 | /* Read in a file describing the target's system call values. |
| 856 | E.g. maybe someone will want to use something other than newlib. |
| 857 | This assumes that the basic system call recognition and value passing/ |
| 858 | returning is supported. So maybe some coding/recompilation will be |
| 859 | necessary, but not as much. |
| 860 | |
| 861 | If an error occurs, the existing mapping is not changed. */ |
| 862 | |
| 863 | CB_RC |
| 864 | cb_read_target_syscall_maps (cb, file) |
| 865 | host_callback *cb; |
| 866 | const char *file; |
| 867 | { |
| 868 | CB_TARGET_DEFS_MAP *syscall_map, *errno_map, *open_map, *signal_map; |
| 869 | const char *stat_map; |
| 870 | FILE *f; |
| 871 | |
| 872 | if ((f = fopen (file, "r")) == NULL) |
| 873 | return CB_RC_ACCESS; |
| 874 | |
| 875 | /* ... read in and parse file ... */ |
| 876 | |
| 877 | fclose (f); |
| 878 | return CB_RC_NO_MEM; /* FIXME:wip */ |
| 879 | |
| 880 | /* Free storage allocated for any existing maps. */ |
| 881 | if (cb->syscall_map) |
| 882 | free (cb->syscall_map); |
| 883 | if (cb->errno_map) |
| 884 | free (cb->errno_map); |
| 885 | if (cb->open_map) |
| 886 | free (cb->open_map); |
| 887 | if (cb->signal_map) |
| 888 | free (cb->signal_map); |
| 889 | if (cb->stat_map) |
| 890 | free ((PTR) cb->stat_map); |
| 891 | |
| 892 | cb->syscall_map = syscall_map; |
| 893 | cb->errno_map = errno_map; |
| 894 | cb->open_map = open_map; |
| 895 | cb->signal_map = signal_map; |
| 896 | cb->stat_map = stat_map; |
| 897 | |
| 898 | return CB_RC_OK; |
| 899 | } |
| 900 | |
| 901 | /* Translate the target's version of a syscall number to the host's. |
| 902 | This isn't actually the host's version, rather a canonical form. |
| 903 | ??? Perhaps this should be renamed to ..._canon_syscall. */ |
| 904 | |
| 905 | int |
| 906 | cb_target_to_host_syscall (cb, target_val) |
| 907 | host_callback *cb; |
| 908 | int target_val; |
| 909 | { |
| 910 | CB_TARGET_DEFS_MAP *m; |
| 911 | |
| 912 | for (m = &cb->syscall_map[0]; m->target_val != -1; ++m) |
| 913 | if (m->target_val == target_val) |
| 914 | return m->host_val; |
| 915 | |
| 916 | return -1; |
| 917 | } |
| 918 | |
| 919 | /* FIXME: sort tables if large. |
| 920 | Alternatively, an obvious improvement for errno conversion is |
| 921 | to machine generate a function with a large switch(). */ |
| 922 | |
| 923 | /* Translate the host's version of errno to the target's. */ |
| 924 | |
| 925 | int |
| 926 | cb_host_to_target_errno (cb, host_val) |
| 927 | host_callback *cb; |
| 928 | int host_val; |
| 929 | { |
| 930 | CB_TARGET_DEFS_MAP *m; |
| 931 | |
| 932 | for (m = &cb->errno_map[0]; m->host_val; ++m) |
| 933 | if (m->host_val == host_val) |
| 934 | return m->target_val; |
| 935 | |
| 936 | /* ??? Which error to return in this case is up for grabs. |
| 937 | Note that some missing values may have standard alternatives. |
| 938 | For now return 0 and require caller to deal with it. */ |
| 939 | return 0; |
| 940 | } |
| 941 | |
| 942 | /* Given a set of target bitmasks for the open system call, |
| 943 | return the host equivalent. |
| 944 | Mapping open flag values is best done by looping so there's no need |
| 945 | to machine generate this function. */ |
| 946 | |
| 947 | int |
| 948 | cb_target_to_host_open (cb, target_val) |
| 949 | host_callback *cb; |
| 950 | int target_val; |
| 951 | { |
| 952 | int host_val = 0; |
| 953 | CB_TARGET_DEFS_MAP *m; |
| 954 | |
| 955 | for (m = &cb->open_map[0]; m->host_val != -1; ++m) |
| 956 | { |
| 957 | switch (m->target_val) |
| 958 | { |
| 959 | /* O_RDONLY can be (and usually is) 0 which needs to be treated |
| 960 | specially. */ |
| 961 | case TARGET_O_RDONLY : |
| 962 | case TARGET_O_WRONLY : |
| 963 | case TARGET_O_RDWR : |
| 964 | if ((target_val & (TARGET_O_RDONLY | TARGET_O_WRONLY | TARGET_O_RDWR)) |
| 965 | == m->target_val) |
| 966 | host_val |= m->host_val; |
| 967 | /* Handle the host/target differentiating between binary and |
| 968 | text mode. Only one case is of importance */ |
| 969 | #if ! defined (TARGET_O_BINARY) && defined (O_BINARY) |
| 970 | host_val |= O_BINARY; |
| 971 | #endif |
| 972 | break; |
| 973 | default : |
| 974 | if ((m->target_val & target_val) == m->target_val) |
| 975 | host_val |= m->host_val; |
| 976 | break; |
| 977 | } |
| 978 | } |
| 979 | |
| 980 | return host_val; |
| 981 | } |
| 982 | |
| 983 | /* Utility for e.g. cb_host_to_target_stat to store values in the target's |
| 984 | stat struct. */ |
| 985 | |
| 986 | void |
| 987 | cb_store_target_endian (cb, p, size, val) |
| 988 | host_callback *cb; |
| 989 | char *p; |
| 990 | int size; |
| 991 | long val; /* ??? must be as big as target word size */ |
| 992 | { |
| 993 | if (cb->target_endian == BFD_ENDIAN_BIG) |
| 994 | { |
| 995 | p += size; |
| 996 | while (size-- > 0) |
| 997 | { |
| 998 | *--p = val; |
| 999 | val >>= 8; |
| 1000 | } |
| 1001 | } |
| 1002 | else |
| 1003 | { |
| 1004 | while (size-- > 0) |
| 1005 | { |
| 1006 | *p++ = val; |
| 1007 | val >>= 8; |
| 1008 | } |
| 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | /* Translate a host's stat struct into a target's. |
| 1013 | If HS is NULL, just compute the length of the buffer required, |
| 1014 | TS is ignored. |
| 1015 | |
| 1016 | The result is the size of the target's stat struct, |
| 1017 | or zero if an error occurred during the translation. */ |
| 1018 | |
| 1019 | int |
| 1020 | cb_host_to_target_stat (cb, hs, ts) |
| 1021 | host_callback *cb; |
| 1022 | const struct stat *hs; |
| 1023 | PTR ts; |
| 1024 | { |
| 1025 | const char *m = cb->stat_map; |
| 1026 | char *p; |
| 1027 | |
| 1028 | if (hs == NULL) |
| 1029 | ts = NULL; |
| 1030 | p = ts; |
| 1031 | |
| 1032 | while (m) |
| 1033 | { |
| 1034 | char *q = strchr (m, ','); |
| 1035 | int size; |
| 1036 | |
| 1037 | /* FIXME: Use sscanf? */ |
| 1038 | if (q == NULL) |
| 1039 | { |
| 1040 | /* FIXME: print error message */ |
| 1041 | return 0; |
| 1042 | } |
| 1043 | size = atoi (q + 1); |
| 1044 | if (size == 0) |
| 1045 | { |
| 1046 | /* FIXME: print error message */ |
| 1047 | return 0; |
| 1048 | } |
| 1049 | |
| 1050 | if (hs != NULL) |
| 1051 | { |
| 1052 | if (0) |
| 1053 | ; |
| 1054 | /* Defined here to avoid emacs indigestion on a lone "else". */ |
| 1055 | #undef ST_x |
| 1056 | #define ST_x(FLD) \ |
| 1057 | else if (strncmp (m, #FLD, q - m) == 0) \ |
| 1058 | cb_store_target_endian (cb, p, size, hs->FLD) |
| 1059 | |
| 1060 | #ifdef HAVE_STRUCT_STAT_ST_DEV |
| 1061 | ST_x (st_dev); |
| 1062 | #endif |
| 1063 | #ifdef HAVE_STRUCT_STAT_ST_INO |
| 1064 | ST_x (st_ino); |
| 1065 | #endif |
| 1066 | #ifdef HAVE_STRUCT_STAT_ST_MODE |
| 1067 | ST_x (st_mode); |
| 1068 | #endif |
| 1069 | #ifdef HAVE_STRUCT_STAT_ST_NLINK |
| 1070 | ST_x (st_nlink); |
| 1071 | #endif |
| 1072 | #ifdef HAVE_STRUCT_STAT_ST_UID |
| 1073 | ST_x (st_uid); |
| 1074 | #endif |
| 1075 | #ifdef HAVE_STRUCT_STAT_ST_GID |
| 1076 | ST_x (st_gid); |
| 1077 | #endif |
| 1078 | #ifdef HAVE_STRUCT_STAT_ST_RDEV |
| 1079 | ST_x (st_rdev); |
| 1080 | #endif |
| 1081 | #ifdef HAVE_STRUCT_STAT_ST_SIZE |
| 1082 | ST_x (st_size); |
| 1083 | #endif |
| 1084 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
| 1085 | ST_x (st_blksize); |
| 1086 | #endif |
| 1087 | #ifdef HAVE_STRUCT_STAT_ST_BLOCKS |
| 1088 | ST_x (st_blocks); |
| 1089 | #endif |
| 1090 | #ifdef HAVE_STRUCT_STAT_ST_ATIME |
| 1091 | ST_x (st_atime); |
| 1092 | #endif |
| 1093 | #ifdef HAVE_STRUCT_STAT_ST_MTIME |
| 1094 | ST_x (st_mtime); |
| 1095 | #endif |
| 1096 | #ifdef HAVE_STRUCT_STAT_ST_CTIME |
| 1097 | ST_x (st_ctime); |
| 1098 | #endif |
| 1099 | #undef ST_x |
| 1100 | /* FIXME:wip */ |
| 1101 | else |
| 1102 | /* Unsupported field, store 0. */ |
| 1103 | cb_store_target_endian (cb, p, size, 0); |
| 1104 | } |
| 1105 | |
| 1106 | p += size; |
| 1107 | m = strchr (q, ':'); |
| 1108 | if (m) |
| 1109 | ++m; |
| 1110 | } |
| 1111 | |
| 1112 | return p - (char *) ts; |
| 1113 | } |
| 1114 | \f |
| 1115 | /* Cover functions to the vfprintf callbacks. |
| 1116 | |
| 1117 | ??? If one thinks of the callbacks as a subsystem onto itself [or part of |
| 1118 | a larger "remote target subsystem"] with a well defined interface, then |
| 1119 | one would think that the subsystem would provide these. However, until |
| 1120 | one is allowed to create such a subsystem (with its own source tree |
| 1121 | independent of any particular user), such a critter can't exist. Thus |
| 1122 | these functions are here for the time being. */ |
| 1123 | |
| 1124 | void |
| 1125 | sim_cb_printf (host_callback *p, const char *fmt, ...) |
| 1126 | { |
| 1127 | va_list ap; |
| 1128 | |
| 1129 | va_start (ap, fmt); |
| 1130 | p->vprintf_filtered (p, fmt, ap); |
| 1131 | va_end (ap); |
| 1132 | } |
| 1133 | |
| 1134 | void |
| 1135 | sim_cb_eprintf (host_callback *p, const char *fmt, ...) |
| 1136 | { |
| 1137 | va_list ap; |
| 1138 | |
| 1139 | va_start (ap, fmt); |
| 1140 | p->evprintf_filtered (p, fmt, ap); |
| 1141 | va_end (ap); |
| 1142 | } |
| 1143 | |
| 1144 | int |
| 1145 | cb_is_stdin (host_callback *cb, int fd) |
| 1146 | { |
| 1147 | return fdbad (cb, fd) ? 0 : fdmap (cb, fd) == 0; |
| 1148 | } |
| 1149 | |
| 1150 | int |
| 1151 | cb_is_stdout (host_callback *cb, int fd) |
| 1152 | { |
| 1153 | return fdbad (cb, fd) ? 0 : fdmap (cb, fd) == 1; |
| 1154 | } |
| 1155 | |
| 1156 | int |
| 1157 | cb_is_stderr (host_callback *cb, int fd) |
| 1158 | { |
| 1159 | return fdbad (cb, fd) ? 0 : fdmap (cb, fd) == 2; |
| 1160 | } |