| 1 | /* Select target systems and architectures at runtime for GDB. |
| 2 | Copyright 1990, 1992 Free Software Foundation, Inc. |
| 3 | Contributed by Cygnus Support. |
| 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 |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 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 |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include <errno.h> |
| 23 | #include <ctype.h> |
| 24 | #include "target.h" |
| 25 | #include "gdbcmd.h" |
| 26 | #include "symtab.h" |
| 27 | #include "inferior.h" |
| 28 | #include "bfd.h" |
| 29 | #include "symfile.h" |
| 30 | #include "objfiles.h" |
| 31 | |
| 32 | extern int errno; |
| 33 | |
| 34 | static void |
| 35 | target_info PARAMS ((char *, int)); |
| 36 | |
| 37 | static void |
| 38 | cleanup_target PARAMS ((struct target_ops *)); |
| 39 | |
| 40 | static void |
| 41 | maybe_kill_then_create_inferior PARAMS ((char *, char *, char **)); |
| 42 | |
| 43 | static void |
| 44 | maybe_kill_then_attach PARAMS ((char *, int)); |
| 45 | |
| 46 | static void |
| 47 | kill_or_be_killed PARAMS ((int)); |
| 48 | |
| 49 | static void |
| 50 | default_terminal_info PARAMS ((char *, int)); |
| 51 | |
| 52 | static int |
| 53 | nosymbol PARAMS ((char *, CORE_ADDR *)); |
| 54 | |
| 55 | static void |
| 56 | tcomplain PARAMS ((void)); |
| 57 | |
| 58 | static int |
| 59 | nomemory PARAMS ((CORE_ADDR, char *, int, int)); |
| 60 | |
| 61 | static int |
| 62 | return_zero PARAMS ((void)); |
| 63 | |
| 64 | static void |
| 65 | ignore PARAMS ((void)); |
| 66 | |
| 67 | static void |
| 68 | target_command PARAMS ((char *, int)); |
| 69 | |
| 70 | static struct target_ops * |
| 71 | find_default_run_target PARAMS ((char *)); |
| 72 | |
| 73 | /* Pointer to array of target architecture structures; the size of the |
| 74 | array; the current index into the array; the allocated size of the |
| 75 | array. */ |
| 76 | struct target_ops **target_structs; |
| 77 | unsigned target_struct_size; |
| 78 | unsigned target_struct_index; |
| 79 | unsigned target_struct_allocsize; |
| 80 | #define DEFAULT_ALLOCSIZE 10 |
| 81 | |
| 82 | /* The initial current target, so that there is always a semi-valid |
| 83 | current target. */ |
| 84 | |
| 85 | struct target_ops dummy_target = {"None", "None", "", |
| 86 | 0, 0, /* open, close */ |
| 87 | find_default_attach, 0, /* attach, detach */ |
| 88 | 0, 0, /* resume, wait */ |
| 89 | 0, 0, 0, /* registers */ |
| 90 | 0, 0, /* memory */ |
| 91 | 0, 0, /* bkpts */ |
| 92 | 0, 0, 0, 0, 0, /* terminal */ |
| 93 | 0, 0, /* kill, load */ |
| 94 | 0, /* lookup_symbol */ |
| 95 | find_default_create_inferior, /* create_inferior */ |
| 96 | 0, /* mourn_inferior */ |
| 97 | 0, /* can_run */ |
| 98 | dummy_stratum, 0, /* stratum, next */ |
| 99 | 0, 0, 0, 0, 0, /* all mem, mem, stack, regs, exec */ |
| 100 | 0, 0, /* section pointers */ |
| 101 | OPS_MAGIC, |
| 102 | }; |
| 103 | |
| 104 | /* The target structure we are currently using to talk to a process |
| 105 | or file or whatever "inferior" we have. */ |
| 106 | |
| 107 | struct target_ops *current_target; |
| 108 | |
| 109 | /* The stack of target structures that have been pushed. */ |
| 110 | |
| 111 | struct target_ops **current_target_stack; |
| 112 | |
| 113 | /* Command list for target. */ |
| 114 | |
| 115 | static struct cmd_list_element *targetlist = NULL; |
| 116 | |
| 117 | /* The user just typed 'target' without the name of a target. */ |
| 118 | |
| 119 | /* ARGSUSED */ |
| 120 | static void |
| 121 | target_command (arg, from_tty) |
| 122 | char *arg; |
| 123 | int from_tty; |
| 124 | { |
| 125 | fputs_filtered ("Argument required (target name). Try `help target'\n", |
| 126 | stdout); |
| 127 | } |
| 128 | |
| 129 | /* Add a possible target architecture to the list. */ |
| 130 | |
| 131 | void |
| 132 | add_target (t) |
| 133 | struct target_ops *t; |
| 134 | { |
| 135 | if (t->to_magic != OPS_MAGIC) |
| 136 | { |
| 137 | fprintf(stderr, "Magic number of %s target struct wrong\n", |
| 138 | t->to_shortname); |
| 139 | abort(); |
| 140 | } |
| 141 | |
| 142 | if (!target_structs) |
| 143 | { |
| 144 | target_struct_allocsize = DEFAULT_ALLOCSIZE; |
| 145 | target_structs = (struct target_ops **) xmalloc |
| 146 | (target_struct_allocsize * sizeof (*target_structs)); |
| 147 | } |
| 148 | if (target_struct_size >= target_struct_allocsize) |
| 149 | { |
| 150 | target_struct_allocsize *= 2; |
| 151 | target_structs = (struct target_ops **) |
| 152 | xrealloc ((char *) target_structs, |
| 153 | target_struct_allocsize * sizeof (*target_structs)); |
| 154 | } |
| 155 | target_structs[target_struct_size++] = t; |
| 156 | cleanup_target (t); |
| 157 | |
| 158 | if (targetlist == NULL) |
| 159 | add_prefix_cmd ("target", class_run, target_command, |
| 160 | "Connect to a target machine or process.\n\ |
| 161 | The first argument is the type or protocol of the target machine.\n\ |
| 162 | Remaining arguments are interpreted by the target protocol. For more\n\ |
| 163 | information on the arguments for a particular protocol, type\n\ |
| 164 | `help target ' followed by the protocol name.", |
| 165 | &targetlist, "target ", 0, &cmdlist); |
| 166 | add_cmd (t->to_shortname, no_class, t->to_open, t->to_doc, &targetlist); |
| 167 | } |
| 168 | |
| 169 | /* Stub functions */ |
| 170 | |
| 171 | static void |
| 172 | ignore () |
| 173 | { |
| 174 | } |
| 175 | |
| 176 | /* ARGSUSED */ |
| 177 | static int |
| 178 | nomemory (memaddr, myaddr, len, write) |
| 179 | CORE_ADDR memaddr; |
| 180 | char *myaddr; |
| 181 | int len; |
| 182 | int write; |
| 183 | { |
| 184 | errno = EIO; /* Can't read/write this location */ |
| 185 | return 0; /* No bytes handled */ |
| 186 | } |
| 187 | |
| 188 | static void |
| 189 | tcomplain () |
| 190 | { |
| 191 | error ("You can't do that when your target is `%s'", |
| 192 | current_target->to_shortname); |
| 193 | } |
| 194 | |
| 195 | void |
| 196 | noprocess () |
| 197 | { |
| 198 | error ("You can't do that without a process to debug"); |
| 199 | } |
| 200 | |
| 201 | /* ARGSUSED */ |
| 202 | static int |
| 203 | nosymbol (name, addrp) |
| 204 | char *name; |
| 205 | CORE_ADDR *addrp; |
| 206 | { |
| 207 | return 1; /* Symbol does not exist in target env */ |
| 208 | } |
| 209 | |
| 210 | /* ARGSUSED */ |
| 211 | static void |
| 212 | default_terminal_info (args, from_tty) |
| 213 | char *args; |
| 214 | int from_tty; |
| 215 | { |
| 216 | printf("No saved terminal information.\n"); |
| 217 | } |
| 218 | |
| 219 | #if 0 |
| 220 | /* With strata, this function is no longer needed. FIXME. */ |
| 221 | /* This is the default target_create_inferior function. It looks up |
| 222 | the stack for some target that cares to create inferiors, then |
| 223 | calls it -- or complains if not found. */ |
| 224 | |
| 225 | static void |
| 226 | upstack_create_inferior (exec, args, env) |
| 227 | char *exec; |
| 228 | char *args; |
| 229 | char **env; |
| 230 | { |
| 231 | struct target_ops *t; |
| 232 | |
| 233 | for (t = current_target; |
| 234 | t; |
| 235 | t = t->to_next) |
| 236 | { |
| 237 | if (t->to_create_inferior != upstack_create_inferior) |
| 238 | { |
| 239 | t->to_create_inferior (exec, args, env); |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | } |
| 244 | tcomplain(); |
| 245 | } |
| 246 | #endif |
| 247 | |
| 248 | /* This is the default target_create_inferior and target_attach function. |
| 249 | If the current target is executing, it asks whether to kill it off. |
| 250 | If this function returns without calling error(), it has killed off |
| 251 | the target, and the operation should be attempted. */ |
| 252 | |
| 253 | static void |
| 254 | kill_or_be_killed (from_tty) |
| 255 | int from_tty; |
| 256 | { |
| 257 | if (target_has_execution) |
| 258 | { |
| 259 | printf ("You are already running a program:\n"); |
| 260 | target_files_info (); |
| 261 | if (query ("Kill it? ")) { |
| 262 | target_kill (); |
| 263 | if (target_has_execution) |
| 264 | error ("Killing the program did not help."); |
| 265 | return; |
| 266 | } else { |
| 267 | error ("Program not killed."); |
| 268 | } |
| 269 | } |
| 270 | tcomplain(); |
| 271 | } |
| 272 | |
| 273 | static void |
| 274 | maybe_kill_then_attach (args, from_tty) |
| 275 | char *args; |
| 276 | int from_tty; |
| 277 | { |
| 278 | kill_or_be_killed (from_tty); |
| 279 | target_attach (args, from_tty); |
| 280 | } |
| 281 | |
| 282 | static void |
| 283 | maybe_kill_then_create_inferior (exec, args, env) |
| 284 | char *exec; |
| 285 | char *args; |
| 286 | char **env; |
| 287 | { |
| 288 | kill_or_be_killed (0); |
| 289 | target_create_inferior (exec, args, env); |
| 290 | } |
| 291 | |
| 292 | /* Clean up a target struct so it no longer has any zero pointers in it. |
| 293 | We default entries, at least to stubs that print error messages. */ |
| 294 | |
| 295 | static void |
| 296 | cleanup_target (t) |
| 297 | struct target_ops *t; |
| 298 | { |
| 299 | |
| 300 | /* Check magic number. If wrong, it probably means someone changed |
| 301 | the struct definition, but not all the places that initialize one. */ |
| 302 | if (t->to_magic != OPS_MAGIC) |
| 303 | { |
| 304 | fprintf(stderr, "Magic number of %s target struct wrong\n", |
| 305 | t->to_shortname); |
| 306 | abort(); |
| 307 | } |
| 308 | |
| 309 | #define de_fault(field, value) \ |
| 310 | if (!t->field) t->field = value |
| 311 | |
| 312 | /* FIELD DEFAULT VALUE */ |
| 313 | |
| 314 | de_fault (to_open, (void (*)())tcomplain); |
| 315 | de_fault (to_close, (void (*)())ignore); |
| 316 | de_fault (to_attach, maybe_kill_then_attach); |
| 317 | de_fault (to_detach, (void (*)())ignore); |
| 318 | de_fault (to_resume, (void (*)())noprocess); |
| 319 | de_fault (to_wait, (int (*)())noprocess); |
| 320 | de_fault (to_fetch_registers, (void (*)())ignore); |
| 321 | de_fault (to_store_registers, (void (*)())noprocess); |
| 322 | de_fault (to_prepare_to_store, (void (*)())noprocess); |
| 323 | de_fault (to_xfer_memory, (int (*)())nomemory); |
| 324 | de_fault (to_files_info, (void (*)())ignore); |
| 325 | de_fault (to_insert_breakpoint, memory_insert_breakpoint); |
| 326 | de_fault (to_remove_breakpoint, memory_remove_breakpoint); |
| 327 | de_fault (to_terminal_init, ignore); |
| 328 | de_fault (to_terminal_inferior, ignore); |
| 329 | de_fault (to_terminal_ours_for_output,ignore); |
| 330 | de_fault (to_terminal_ours, ignore); |
| 331 | de_fault (to_terminal_info, default_terminal_info); |
| 332 | de_fault (to_kill, (void (*)())noprocess); |
| 333 | de_fault (to_load, (void (*)())tcomplain); |
| 334 | de_fault (to_lookup_symbol, nosymbol); |
| 335 | de_fault (to_create_inferior, maybe_kill_then_create_inferior); |
| 336 | de_fault (to_mourn_inferior, (void (*)())noprocess); |
| 337 | de_fault (to_can_run, return_zero); |
| 338 | de_fault (to_next, 0); |
| 339 | de_fault (to_has_all_memory, 0); |
| 340 | de_fault (to_has_memory, 0); |
| 341 | de_fault (to_has_stack, 0); |
| 342 | de_fault (to_has_registers, 0); |
| 343 | de_fault (to_has_execution, 0); |
| 344 | |
| 345 | #undef de_fault |
| 346 | } |
| 347 | |
| 348 | /* Push a new target type into the stack of the existing target accessors, |
| 349 | possibly superseding some of the existing accessors. |
| 350 | |
| 351 | Result is zero if the pushed target ended up on top of the stack, |
| 352 | nonzero if at least one target is on top of it. |
| 353 | |
| 354 | Rather than allow an empty stack, we always have the dummy target at |
| 355 | the bottom stratum, so we can call the function vectors without |
| 356 | checking them. */ |
| 357 | |
| 358 | int |
| 359 | push_target (t) |
| 360 | struct target_ops *t; |
| 361 | { |
| 362 | struct target_ops *st, *prev; |
| 363 | |
| 364 | for (prev = 0, st = current_target; |
| 365 | st; |
| 366 | prev = st, st = st->to_next) { |
| 367 | if ((int)(t->to_stratum) >= (int)(st->to_stratum)) |
| 368 | break; |
| 369 | } |
| 370 | |
| 371 | while (t->to_stratum == st->to_stratum) { |
| 372 | /* There's already something on this stratum. Close it off. */ |
| 373 | (st->to_close) (0); |
| 374 | if (prev) |
| 375 | prev->to_next = st->to_next; /* Unchain old target_ops */ |
| 376 | else |
| 377 | current_target = st->to_next; /* Unchain first on list */ |
| 378 | st = st->to_next; |
| 379 | } |
| 380 | |
| 381 | /* We have removed all targets in our stratum, now add ourself. */ |
| 382 | t->to_next = st; |
| 383 | if (prev) |
| 384 | prev->to_next = t; |
| 385 | else |
| 386 | current_target = t; |
| 387 | |
| 388 | cleanup_target (current_target); |
| 389 | return prev != 0; |
| 390 | } |
| 391 | |
| 392 | /* Remove a target_ops vector from the stack, wherever it may be. |
| 393 | Return how many times it was removed (0 or 1 unless bug). */ |
| 394 | |
| 395 | int |
| 396 | unpush_target (t) |
| 397 | struct target_ops *t; |
| 398 | { |
| 399 | struct target_ops *u, *v; |
| 400 | int result = 0; |
| 401 | |
| 402 | for (u = current_target, v = 0; |
| 403 | u; |
| 404 | v = u, u = u->to_next) |
| 405 | if (u == t) |
| 406 | { |
| 407 | if (v == 0) |
| 408 | pop_target(); /* unchain top copy */ |
| 409 | else { |
| 410 | (t->to_close)(0); /* Let it clean up */ |
| 411 | v->to_next = t->to_next; /* unchain middle copy */ |
| 412 | } |
| 413 | result++; |
| 414 | } |
| 415 | return result; |
| 416 | } |
| 417 | |
| 418 | void |
| 419 | pop_target () |
| 420 | { |
| 421 | (current_target->to_close)(0); /* Let it clean up */ |
| 422 | current_target = current_target->to_next; |
| 423 | if (!current_target) /* At bottom, push dummy. */ |
| 424 | push_target (&dummy_target); |
| 425 | } |
| 426 | |
| 427 | #define MIN(A, B) (((A) <= (B)) ? (A) : (B)) |
| 428 | |
| 429 | /* target_read_string -- read a null terminated string from MEMADDR in target. |
| 430 | The read may also be terminated early by getting an error from target_xfer_ |
| 431 | memory. |
| 432 | LEN is the size of the buffer pointed to by MYADDR. Note that a terminating |
| 433 | null will only be written if there is sufficient room. The return value is |
| 434 | is the number of bytes (including the null) actually transferred. |
| 435 | */ |
| 436 | |
| 437 | int |
| 438 | target_read_string (memaddr, myaddr, len) |
| 439 | CORE_ADDR memaddr; |
| 440 | char *myaddr; |
| 441 | int len; |
| 442 | { |
| 443 | int tlen, origlen, offset, i; |
| 444 | char buf[4]; |
| 445 | |
| 446 | origlen = len; |
| 447 | |
| 448 | while (len > 0) |
| 449 | { |
| 450 | tlen = MIN (len, 4 - (memaddr & 3)); |
| 451 | offset = memaddr & 3; |
| 452 | |
| 453 | if (target_xfer_memory (memaddr & ~3, buf, 4, 0)) |
| 454 | return origlen - len; |
| 455 | |
| 456 | for (i = 0; i < tlen; i++) |
| 457 | { |
| 458 | *myaddr++ = buf[i + offset]; |
| 459 | if (buf[i + offset] == '\000') |
| 460 | return (origlen - len) + i + 1; |
| 461 | } |
| 462 | |
| 463 | memaddr += tlen; |
| 464 | len -= tlen; |
| 465 | } |
| 466 | return origlen; |
| 467 | } |
| 468 | |
| 469 | /* Move memory to or from the targets. Iterate until all of it has |
| 470 | been moved, if necessary. The top target gets priority; anything |
| 471 | it doesn't want, is offered to the next one down, etc. Note the |
| 472 | business with curlen: if an early target says "no, but I have a |
| 473 | boundary overlapping this xfer" then we shorten what we offer to |
| 474 | the subsequent targets so the early guy will get a chance at the |
| 475 | tail before the subsequent ones do. |
| 476 | |
| 477 | Result is 0 or errno value. */ |
| 478 | |
| 479 | int |
| 480 | target_read_memory (memaddr, myaddr, len) |
| 481 | CORE_ADDR memaddr; |
| 482 | char *myaddr; |
| 483 | int len; |
| 484 | { |
| 485 | return target_xfer_memory (memaddr, myaddr, len, 0); |
| 486 | } |
| 487 | |
| 488 | int |
| 489 | target_write_memory (memaddr, myaddr, len) |
| 490 | CORE_ADDR memaddr; |
| 491 | char *myaddr; |
| 492 | int len; |
| 493 | { |
| 494 | return target_xfer_memory (memaddr, myaddr, len, 1); |
| 495 | } |
| 496 | |
| 497 | int |
| 498 | target_xfer_memory (memaddr, myaddr, len, write) |
| 499 | CORE_ADDR memaddr; |
| 500 | char *myaddr; |
| 501 | int len; |
| 502 | int write; |
| 503 | { |
| 504 | int curlen; |
| 505 | int res; |
| 506 | struct target_ops *t; |
| 507 | |
| 508 | /* The quick case is that the top target does it all. */ |
| 509 | res = current_target->to_xfer_memory |
| 510 | (memaddr, myaddr, len, write, current_target); |
| 511 | if (res == len) |
| 512 | return 0; |
| 513 | |
| 514 | if (res > 0) |
| 515 | goto bump; |
| 516 | /* If res <= 0 then we call it again in the loop. Ah well. */ |
| 517 | |
| 518 | for (; len > 0;) |
| 519 | { |
| 520 | curlen = len; /* Want to do it all */ |
| 521 | for (t = current_target; |
| 522 | t; |
| 523 | t = t->to_has_all_memory? 0: t->to_next) |
| 524 | { |
| 525 | res = t->to_xfer_memory(memaddr, myaddr, curlen, write, t); |
| 526 | if (res > 0) break; /* Handled all or part of xfer */ |
| 527 | if (res == 0) continue; /* Handled none */ |
| 528 | curlen = -res; /* Could handle once we get past res bytes */ |
| 529 | } |
| 530 | if (res <= 0) |
| 531 | { |
| 532 | /* If this address is for nonexistent memory, |
| 533 | read zeros if reading, or do nothing if writing. Return error. */ |
| 534 | if (!write) |
| 535 | memset (myaddr, 0, len); |
| 536 | if (errno == 0) |
| 537 | return EIO; |
| 538 | else |
| 539 | return errno; |
| 540 | } |
| 541 | bump: |
| 542 | memaddr += res; |
| 543 | myaddr += res; |
| 544 | len -= res; |
| 545 | } |
| 546 | return 0; /* We managed to cover it all somehow. */ |
| 547 | } |
| 548 | |
| 549 | |
| 550 | /* ARGSUSED */ |
| 551 | static void |
| 552 | target_info (args, from_tty) |
| 553 | char *args; |
| 554 | int from_tty; |
| 555 | { |
| 556 | struct target_ops *t; |
| 557 | int has_all_mem = 0; |
| 558 | |
| 559 | if (symfile_objfile != NULL) |
| 560 | printf ("Symbols from \"%s\".\n", symfile_objfile->name); |
| 561 | |
| 562 | #ifdef FILES_INFO_HOOK |
| 563 | if (FILES_INFO_HOOK ()) |
| 564 | return; |
| 565 | #endif |
| 566 | |
| 567 | for (t = current_target; |
| 568 | t; |
| 569 | t = t->to_next) |
| 570 | { |
| 571 | if ((int)(t->to_stratum) <= (int)dummy_stratum) |
| 572 | continue; |
| 573 | if (has_all_mem) |
| 574 | printf("\tWhile running this, gdb does not access memory from...\n"); |
| 575 | printf("%s:\n", t->to_longname); |
| 576 | (t->to_files_info)(t); |
| 577 | has_all_mem = t->to_has_all_memory; |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | /* This is to be called by the open routine before it does |
| 582 | anything. */ |
| 583 | |
| 584 | void |
| 585 | target_preopen (from_tty) |
| 586 | int from_tty; |
| 587 | { |
| 588 | dont_repeat(); |
| 589 | |
| 590 | if (target_has_execution) |
| 591 | { |
| 592 | if (query ("A program is being debugged already. Kill it? ")) |
| 593 | target_kill (); |
| 594 | else |
| 595 | error ("Program not killed."); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | /* Look through the list of possible targets for a target that can |
| 600 | execute a run or attach command without any other data. This is |
| 601 | used to locate the default process stratum. |
| 602 | |
| 603 | Result is always valid (error() is called for errors). */ |
| 604 | |
| 605 | static struct target_ops * |
| 606 | find_default_run_target (do_mesg) |
| 607 | char *do_mesg; |
| 608 | { |
| 609 | struct target_ops **t; |
| 610 | struct target_ops *runable; |
| 611 | int count; |
| 612 | |
| 613 | count = 0; |
| 614 | |
| 615 | for (t = target_structs; t < target_structs + target_struct_size; |
| 616 | ++t) |
| 617 | { |
| 618 | if (target_can_run(*t)) |
| 619 | { |
| 620 | runable = *t; |
| 621 | ++count; |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | if (count != 1) |
| 626 | error ("Don't know how to %s. Try \"help target\".", do_mesg); |
| 627 | |
| 628 | return runable; |
| 629 | } |
| 630 | |
| 631 | void |
| 632 | find_default_attach (args, from_tty) |
| 633 | char *args; |
| 634 | int from_tty; |
| 635 | { |
| 636 | struct target_ops *t; |
| 637 | |
| 638 | t = find_default_run_target("attach"); |
| 639 | (t->to_attach) (args, from_tty); |
| 640 | return; |
| 641 | } |
| 642 | |
| 643 | void |
| 644 | find_default_create_inferior (exec_file, allargs, env) |
| 645 | char *exec_file; |
| 646 | char *allargs; |
| 647 | char **env; |
| 648 | { |
| 649 | struct target_ops *t; |
| 650 | |
| 651 | t = find_default_run_target("run"); |
| 652 | (t->to_create_inferior) (exec_file, allargs, env); |
| 653 | return; |
| 654 | } |
| 655 | |
| 656 | static int |
| 657 | return_zero () |
| 658 | { |
| 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | static char targ_desc[] = |
| 663 | "Names of targets and files being debugged.\n\ |
| 664 | Shows the entire stack of targets currently in use (including the exec-file,\n\ |
| 665 | core-file, and process, if any), as well as the symbol file name."; |
| 666 | |
| 667 | void |
| 668 | _initialize_targets () |
| 669 | { |
| 670 | current_target = &dummy_target; |
| 671 | cleanup_target (current_target); |
| 672 | |
| 673 | add_info ("target", target_info, targ_desc); |
| 674 | add_info ("files", target_info, targ_desc); |
| 675 | } |