| 1 | /* Work with executable files, for GDB. |
| 2 | Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "target.h" |
| 24 | #include "gdbcmd.h" |
| 25 | #include "language.h" |
| 26 | |
| 27 | #ifdef USG |
| 28 | #include <sys/types.h> |
| 29 | #endif |
| 30 | |
| 31 | #include <sys/param.h> |
| 32 | #include <fcntl.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include "gdbcore.h" |
| 36 | |
| 37 | #include <ctype.h> |
| 38 | #include <sys/stat.h> |
| 39 | #ifndef O_BINARY |
| 40 | #define O_BINARY 0 |
| 41 | #endif |
| 42 | |
| 43 | /* Prototypes for local functions */ |
| 44 | |
| 45 | static void |
| 46 | add_to_section_table PARAMS ((bfd *, sec_ptr, PTR)); |
| 47 | |
| 48 | static void |
| 49 | exec_close PARAMS ((int)); |
| 50 | |
| 51 | static void |
| 52 | file_command PARAMS ((char *, int)); |
| 53 | |
| 54 | static void |
| 55 | set_section_command PARAMS ((char *, int)); |
| 56 | |
| 57 | static void |
| 58 | exec_files_info PARAMS ((struct target_ops *)); |
| 59 | |
| 60 | extern int info_verbose; |
| 61 | |
| 62 | /* The Binary File Descriptor handle for the executable file. */ |
| 63 | |
| 64 | bfd *exec_bfd = NULL; |
| 65 | |
| 66 | /* Whether to open exec and core files read-only or read-write. */ |
| 67 | |
| 68 | int write_files = 0; |
| 69 | |
| 70 | /* Text start and end addresses (KLUDGE) if needed */ |
| 71 | |
| 72 | #ifdef NEED_TEXT_START_END |
| 73 | CORE_ADDR text_start = 0; |
| 74 | CORE_ADDR text_end = 0; |
| 75 | #endif |
| 76 | |
| 77 | /* Forward decl */ |
| 78 | |
| 79 | extern struct target_ops exec_ops; |
| 80 | |
| 81 | /* ARGSUSED */ |
| 82 | static void |
| 83 | exec_close (quitting) |
| 84 | int quitting; |
| 85 | { |
| 86 | if (exec_bfd) { |
| 87 | char *name = bfd_get_filename (exec_bfd); |
| 88 | bfd_close (exec_bfd); |
| 89 | free (name); |
| 90 | exec_bfd = NULL; |
| 91 | } |
| 92 | if (exec_ops.to_sections) { |
| 93 | free ((PTR)exec_ops.to_sections); |
| 94 | exec_ops.to_sections = NULL; |
| 95 | exec_ops.to_sections_end = NULL; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | /* Process the first arg in ARGS as the new exec file. |
| 100 | |
| 101 | Note that we have to explicitly ignore additional args, since we can |
| 102 | be called from file_command(), which also calls symbol_file_command() |
| 103 | which can take multiple args. */ |
| 104 | |
| 105 | void |
| 106 | exec_file_command (args, from_tty) |
| 107 | char *args; |
| 108 | int from_tty; |
| 109 | { |
| 110 | char **argv; |
| 111 | char *filename; |
| 112 | |
| 113 | target_preopen (from_tty); |
| 114 | |
| 115 | /* Remove any previous exec file. */ |
| 116 | unpush_target (&exec_ops); |
| 117 | |
| 118 | /* Now open and digest the file the user requested, if any. */ |
| 119 | |
| 120 | if (args) |
| 121 | { |
| 122 | char *scratch_pathname; |
| 123 | int scratch_chan; |
| 124 | |
| 125 | /* Scan through the args and pick up the first non option arg |
| 126 | as the filename. */ |
| 127 | |
| 128 | if ((argv = buildargv (args)) == NULL) |
| 129 | { |
| 130 | nomem (0); |
| 131 | } |
| 132 | make_cleanup (freeargv, (char *) argv); |
| 133 | |
| 134 | for (; (*argv != NULL) && (**argv == '-'); argv++) {;} |
| 135 | if (*argv == NULL) |
| 136 | { |
| 137 | error ("no exec file name was specified"); |
| 138 | } |
| 139 | |
| 140 | filename = tilde_expand (*argv); |
| 141 | make_cleanup (free, filename); |
| 142 | |
| 143 | scratch_chan = openp (getenv ("PATH"), 1, filename, |
| 144 | write_files? O_RDWR|O_BINARY: O_RDONLY|O_BINARY, 0, |
| 145 | &scratch_pathname); |
| 146 | if (scratch_chan < 0) |
| 147 | perror_with_name (filename); |
| 148 | |
| 149 | exec_bfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); |
| 150 | if (!exec_bfd) |
| 151 | error ("Could not open `%s' as an executable file: %s", |
| 152 | scratch_pathname, bfd_errmsg (bfd_error)); |
| 153 | if (!bfd_check_format (exec_bfd, bfd_object)) |
| 154 | { |
| 155 | /* Make sure to close exec_bfd, or else "run" might try to use |
| 156 | it. */ |
| 157 | exec_close (0); |
| 158 | error ("\"%s\": not in executable format: %s.", |
| 159 | scratch_pathname, bfd_errmsg (bfd_error)); |
| 160 | } |
| 161 | |
| 162 | if (build_section_table (exec_bfd, &exec_ops.to_sections, |
| 163 | &exec_ops.to_sections_end)) |
| 164 | { |
| 165 | /* Make sure to close exec_bfd, or else "run" might try to use |
| 166 | it. */ |
| 167 | exec_close (0); |
| 168 | error ("Can't find the file sections in `%s': %s", |
| 169 | exec_bfd->filename, bfd_errmsg (bfd_error)); |
| 170 | } |
| 171 | |
| 172 | #ifdef NEED_TEXT_START_END |
| 173 | |
| 174 | /* text_end is sometimes used for where to put call dummies. A |
| 175 | few ports use these for other purposes too. */ |
| 176 | |
| 177 | { |
| 178 | struct section_table *p; |
| 179 | |
| 180 | /* Set text_start to the lowest address of the start of any |
| 181 | readonly code section and set text_end to the highest |
| 182 | address of the end of any readonly code section. */ |
| 183 | |
| 184 | text_start = ~(CORE_ADDR)0; |
| 185 | text_end = (CORE_ADDR)0; |
| 186 | for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++) |
| 187 | if (bfd_get_section_flags (p->bfd, p->sec_ptr) |
| 188 | & (SEC_CODE | SEC_READONLY)) |
| 189 | { |
| 190 | if (text_start > p->addr) |
| 191 | text_start = p->addr; |
| 192 | if (text_end < p->endaddr) |
| 193 | text_end = p->endaddr; |
| 194 | } |
| 195 | } |
| 196 | #endif |
| 197 | |
| 198 | validate_files (); |
| 199 | |
| 200 | push_target (&exec_ops); |
| 201 | |
| 202 | /* Tell display code (if any) about the changed file name. */ |
| 203 | if (exec_file_display_hook) |
| 204 | (*exec_file_display_hook) (filename); |
| 205 | } |
| 206 | else if (from_tty) |
| 207 | printf_unfiltered ("No exec file now.\n"); |
| 208 | } |
| 209 | |
| 210 | /* Set both the exec file and the symbol file, in one command. |
| 211 | What a novelty. Why did GDB go through four major releases before this |
| 212 | command was added? */ |
| 213 | |
| 214 | static void |
| 215 | file_command (arg, from_tty) |
| 216 | char *arg; |
| 217 | int from_tty; |
| 218 | { |
| 219 | /* FIXME, if we lose on reading the symbol file, we should revert |
| 220 | the exec file, but that's rough. */ |
| 221 | exec_file_command (arg, from_tty); |
| 222 | symbol_file_command (arg, from_tty); |
| 223 | } |
| 224 | |
| 225 | \f |
| 226 | /* Locate all mappable sections of a BFD file. |
| 227 | table_pp_char is a char * to get it through bfd_map_over_sections; |
| 228 | we cast it back to its proper type. */ |
| 229 | |
| 230 | static void |
| 231 | add_to_section_table (abfd, asect, table_pp_char) |
| 232 | bfd *abfd; |
| 233 | sec_ptr asect; |
| 234 | PTR table_pp_char; |
| 235 | { |
| 236 | struct section_table **table_pp = (struct section_table **)table_pp_char; |
| 237 | flagword aflag; |
| 238 | |
| 239 | aflag = bfd_get_section_flags (abfd, asect); |
| 240 | /* FIXME, we need to handle BSS segment here...it alloc's but doesn't load */ |
| 241 | if (!(aflag & SEC_LOAD)) |
| 242 | return; |
| 243 | if (0 == bfd_section_size (abfd, asect)) |
| 244 | return; |
| 245 | (*table_pp)->bfd = abfd; |
| 246 | (*table_pp)->sec_ptr = asect; |
| 247 | (*table_pp)->addr = bfd_section_vma (abfd, asect); |
| 248 | (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect); |
| 249 | (*table_pp)++; |
| 250 | } |
| 251 | |
| 252 | /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR. |
| 253 | Returns 0 if OK, 1 on error. */ |
| 254 | |
| 255 | int |
| 256 | build_section_table (some_bfd, start, end) |
| 257 | bfd *some_bfd; |
| 258 | struct section_table **start, **end; |
| 259 | { |
| 260 | unsigned count; |
| 261 | |
| 262 | count = bfd_count_sections (some_bfd); |
| 263 | if (*start) |
| 264 | free ((PTR)*start); |
| 265 | *start = (struct section_table *) xmalloc (count * sizeof (**start)); |
| 266 | *end = *start; |
| 267 | bfd_map_over_sections (some_bfd, add_to_section_table, (char *)end); |
| 268 | if (*end > *start + count) |
| 269 | abort(); |
| 270 | /* We could realloc the table, but it probably loses for most files. */ |
| 271 | return 0; |
| 272 | } |
| 273 | \f |
| 274 | /* Read or write the exec file. |
| 275 | |
| 276 | Args are address within a BFD file, address within gdb address-space, |
| 277 | length, and a flag indicating whether to read or write. |
| 278 | |
| 279 | Result is a length: |
| 280 | |
| 281 | 0: We cannot handle this address and length. |
| 282 | > 0: We have handled N bytes starting at this address. |
| 283 | (If N == length, we did it all.) We might be able |
| 284 | to handle more bytes beyond this length, but no |
| 285 | promises. |
| 286 | < 0: We cannot handle this address, but if somebody |
| 287 | else handles (-N) bytes, we can start from there. |
| 288 | |
| 289 | The same routine is used to handle both core and exec files; |
| 290 | we just tail-call it with more arguments to select between them. */ |
| 291 | |
| 292 | int |
| 293 | xfer_memory (memaddr, myaddr, len, write, target) |
| 294 | CORE_ADDR memaddr; |
| 295 | char *myaddr; |
| 296 | int len; |
| 297 | int write; |
| 298 | struct target_ops *target; |
| 299 | { |
| 300 | boolean res; |
| 301 | struct section_table *p; |
| 302 | CORE_ADDR nextsectaddr, memend; |
| 303 | boolean (*xfer_fn) PARAMS ((bfd *, sec_ptr, PTR, file_ptr, bfd_size_type)); |
| 304 | |
| 305 | if (len <= 0) |
| 306 | abort(); |
| 307 | |
| 308 | memend = memaddr + len; |
| 309 | xfer_fn = write? bfd_set_section_contents: bfd_get_section_contents; |
| 310 | nextsectaddr = memend; |
| 311 | |
| 312 | for (p = target->to_sections; p < target->to_sections_end; p++) |
| 313 | { |
| 314 | if (p->addr <= memaddr) |
| 315 | if (p->endaddr >= memend) |
| 316 | { |
| 317 | /* Entire transfer is within this section. */ |
| 318 | res = xfer_fn (p->bfd, p->sec_ptr, myaddr, memaddr - p->addr, len); |
| 319 | return (res != false)? len: 0; |
| 320 | } |
| 321 | else if (p->endaddr <= memaddr) |
| 322 | { |
| 323 | /* This section ends before the transfer starts. */ |
| 324 | continue; |
| 325 | } |
| 326 | else |
| 327 | { |
| 328 | /* This section overlaps the transfer. Just do half. */ |
| 329 | len = p->endaddr - memaddr; |
| 330 | res = xfer_fn (p->bfd, p->sec_ptr, myaddr, memaddr - p->addr, len); |
| 331 | return (res != false)? len: 0; |
| 332 | } |
| 333 | else if (p->addr < nextsectaddr) |
| 334 | nextsectaddr = p->addr; |
| 335 | } |
| 336 | |
| 337 | if (nextsectaddr >= memend) |
| 338 | return 0; /* We can't help */ |
| 339 | else |
| 340 | return - (nextsectaddr - memaddr); /* Next boundary where we can help */ |
| 341 | } |
| 342 | |
| 343 | #ifdef FIXME |
| 344 | #ifdef REG_STACK_SEGMENT |
| 345 | /* MOVE TO BFD... */ |
| 346 | /* Pyramids and AM29000s have an extra segment in the virtual address space |
| 347 | for the (control) stack of register-window frames. The AM29000 folk |
| 348 | call it the "register stack" rather than the "memory stack". */ |
| 349 | else if (memaddr >= reg_stack_start && memaddr < reg_stack_end) |
| 350 | { |
| 351 | i = min (len, reg_stack_end - memaddr); |
| 352 | fileptr = memaddr - reg_stack_start + reg_stack_offset; |
| 353 | wanna_xfer = coredata; |
| 354 | } |
| 355 | #endif /* REG_STACK_SEGMENT */ |
| 356 | #endif /* FIXME */ |
| 357 | \f |
| 358 | void |
| 359 | print_section_info (t, abfd) |
| 360 | struct target_ops *t; |
| 361 | bfd *abfd; |
| 362 | { |
| 363 | struct section_table *p; |
| 364 | |
| 365 | printf_filtered ("\t`%s', ", bfd_get_filename(abfd)); |
| 366 | wrap_here (" "); |
| 367 | printf_filtered ("file type %s.\n", bfd_get_target(abfd)); |
| 368 | printf_filtered ("\tEntry point: %s\n", |
| 369 | local_hex_string ((unsigned long) bfd_get_start_address (exec_bfd))); |
| 370 | for (p = t->to_sections; p < t->to_sections_end; p++) { |
| 371 | printf_filtered ("\t%s", local_hex_string_custom ((unsigned long) p->addr, "08l")); |
| 372 | printf_filtered (" - %s", local_hex_string_custom ((unsigned long) p->endaddr, "08l")); |
| 373 | if (info_verbose) |
| 374 | printf_filtered (" @ %s", |
| 375 | local_hex_string_custom ((unsigned long) p->sec_ptr->filepos, "08l")); |
| 376 | printf_filtered (" is %s", bfd_section_name (p->bfd, p->sec_ptr)); |
| 377 | if (p->bfd != abfd) { |
| 378 | printf_filtered (" in %s", bfd_get_filename (p->bfd)); |
| 379 | } |
| 380 | printf_filtered ("\n"); |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | static void |
| 385 | exec_files_info (t) |
| 386 | struct target_ops *t; |
| 387 | { |
| 388 | print_section_info (t, exec_bfd); |
| 389 | } |
| 390 | |
| 391 | static void |
| 392 | set_section_command (args, from_tty) |
| 393 | char *args; |
| 394 | int from_tty; |
| 395 | { |
| 396 | struct section_table *p; |
| 397 | char *secname; |
| 398 | unsigned seclen; |
| 399 | unsigned long secaddr; |
| 400 | char secprint[100]; |
| 401 | long offset; |
| 402 | |
| 403 | if (args == 0) |
| 404 | error ("Must specify section name and its virtual address"); |
| 405 | |
| 406 | /* Parse out section name */ |
| 407 | for (secname = args; !isspace(*args); args++) ; |
| 408 | seclen = args - secname; |
| 409 | |
| 410 | /* Parse out new virtual address */ |
| 411 | secaddr = parse_and_eval_address (args); |
| 412 | |
| 413 | for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++) { |
| 414 | if (!strncmp (secname, bfd_section_name (exec_bfd, p->sec_ptr), seclen) |
| 415 | && bfd_section_name (exec_bfd, p->sec_ptr)[seclen] == '\0') { |
| 416 | offset = secaddr - p->addr; |
| 417 | p->addr += offset; |
| 418 | p->endaddr += offset; |
| 419 | if (from_tty) |
| 420 | exec_files_info(&exec_ops); |
| 421 | return; |
| 422 | } |
| 423 | } |
| 424 | if (seclen >= sizeof (secprint)) |
| 425 | seclen = sizeof (secprint) - 1; |
| 426 | strncpy (secprint, secname, seclen); |
| 427 | secprint[seclen] = '\0'; |
| 428 | error ("Section %s not found", secprint); |
| 429 | } |
| 430 | |
| 431 | /* If mourn is being called in all the right places, this could be say |
| 432 | `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */ |
| 433 | |
| 434 | static int |
| 435 | ignore (addr, contents) |
| 436 | CORE_ADDR addr; |
| 437 | char *contents; |
| 438 | { |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | struct target_ops exec_ops = { |
| 443 | "exec", "Local exec file", |
| 444 | "Use an executable file as a target.\n\ |
| 445 | Specify the filename of the executable file.", |
| 446 | exec_file_command, exec_close, /* open, close */ |
| 447 | find_default_attach, 0, 0, 0, /* attach, detach, resume, wait, */ |
| 448 | 0, 0, /* fetch_registers, store_registers, */ |
| 449 | 0, /* prepare_to_store, */ |
| 450 | xfer_memory, exec_files_info, |
| 451 | ignore, ignore, /* insert_breakpoint, remove_breakpoint, */ |
| 452 | 0, 0, 0, 0, 0, /* terminal stuff */ |
| 453 | 0, 0, /* kill, load */ |
| 454 | 0, /* lookup sym */ |
| 455 | find_default_create_inferior, |
| 456 | 0, /* mourn_inferior */ |
| 457 | 0, /* can_run */ |
| 458 | 0, /* notice_signals */ |
| 459 | file_stratum, 0, /* next */ |
| 460 | 0, 1, 0, 0, 0, /* all mem, mem, stack, regs, exec */ |
| 461 | 0, 0, /* section pointers */ |
| 462 | OPS_MAGIC, /* Always the last thing */ |
| 463 | }; |
| 464 | |
| 465 | void |
| 466 | _initialize_exec() |
| 467 | { |
| 468 | struct cmd_list_element *c; |
| 469 | |
| 470 | c = add_cmd ("file", class_files, file_command, |
| 471 | "Use FILE as program to be debugged.\n\ |
| 472 | It is read for its symbols, for getting the contents of pure memory,\n\ |
| 473 | and it is the program executed when you use the `run' command.\n\ |
| 474 | If FILE cannot be found as specified, your execution directory path\n\ |
| 475 | ($PATH) is searched for a command of that name.\n\ |
| 476 | No arg means to have no executable file and no symbols.", &cmdlist); |
| 477 | c->completer = filename_completer; |
| 478 | |
| 479 | c = add_cmd ("exec-file", class_files, exec_file_command, |
| 480 | "Use FILE as program for getting contents of pure memory.\n\ |
| 481 | If FILE cannot be found as specified, your execution directory path\n\ |
| 482 | is searched for a command of that name.\n\ |
| 483 | No arg means have no executable file.", &cmdlist); |
| 484 | c->completer = filename_completer; |
| 485 | |
| 486 | add_com ("section", class_files, set_section_command, |
| 487 | "Change the base address of section SECTION of the exec file to ADDR.\n\ |
| 488 | This can be used if the exec file does not contain section addresses,\n\ |
| 489 | (such as in the a.out format), or when the addresses specified in the\n\ |
| 490 | file itself are wrong. Each section must be changed separately. The\n\ |
| 491 | ``info files'' command lists all the sections and their addresses."); |
| 492 | |
| 493 | add_show_from_set |
| 494 | (add_set_cmd ("write", class_support, var_boolean, (char *)&write_files, |
| 495 | "Set writing into executable and core files.", |
| 496 | &setlist), |
| 497 | &showlist); |
| 498 | |
| 499 | add_target (&exec_ops); |
| 500 | } |