| 1 | /* Select target systems and architectures at runtime for GDB. |
| 2 | Copyright 1990, 1992, 1993 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 | 0, /* notice_signals */ |
| 99 | dummy_stratum, 0, /* stratum, next */ |
| 100 | 0, 0, 0, 0, 0, /* all mem, mem, stack, regs, exec */ |
| 101 | 0, 0, /* section pointers */ |
| 102 | OPS_MAGIC, |
| 103 | }; |
| 104 | |
| 105 | /* The target structure we are currently using to talk to a process |
| 106 | or file or whatever "inferior" we have. */ |
| 107 | |
| 108 | struct target_ops *current_target; |
| 109 | |
| 110 | /* The stack of target structures that have been pushed. */ |
| 111 | |
| 112 | struct target_ops **current_target_stack; |
| 113 | |
| 114 | /* Command list for target. */ |
| 115 | |
| 116 | static struct cmd_list_element *targetlist = NULL; |
| 117 | |
| 118 | /* The user just typed 'target' without the name of a target. */ |
| 119 | |
| 120 | /* ARGSUSED */ |
| 121 | static void |
| 122 | target_command (arg, from_tty) |
| 123 | char *arg; |
| 124 | int from_tty; |
| 125 | { |
| 126 | fputs_filtered ("Argument required (target name). Try `help target'\n", |
| 127 | stdout); |
| 128 | } |
| 129 | |
| 130 | /* Add a possible target architecture to the list. */ |
| 131 | |
| 132 | void |
| 133 | add_target (t) |
| 134 | struct target_ops *t; |
| 135 | { |
| 136 | if (t->to_magic != OPS_MAGIC) |
| 137 | { |
| 138 | fprintf(stderr, "Magic number of %s target struct wrong\n", |
| 139 | t->to_shortname); |
| 140 | abort(); |
| 141 | } |
| 142 | |
| 143 | if (!target_structs) |
| 144 | { |
| 145 | target_struct_allocsize = DEFAULT_ALLOCSIZE; |
| 146 | target_structs = (struct target_ops **) xmalloc |
| 147 | (target_struct_allocsize * sizeof (*target_structs)); |
| 148 | } |
| 149 | if (target_struct_size >= target_struct_allocsize) |
| 150 | { |
| 151 | target_struct_allocsize *= 2; |
| 152 | target_structs = (struct target_ops **) |
| 153 | xrealloc ((char *) target_structs, |
| 154 | target_struct_allocsize * sizeof (*target_structs)); |
| 155 | } |
| 156 | target_structs[target_struct_size++] = t; |
| 157 | cleanup_target (t); |
| 158 | |
| 159 | if (targetlist == NULL) |
| 160 | add_prefix_cmd ("target", class_run, target_command, |
| 161 | "Connect to a target machine or process.\n\ |
| 162 | The first argument is the type or protocol of the target machine.\n\ |
| 163 | Remaining arguments are interpreted by the target protocol. For more\n\ |
| 164 | information on the arguments for a particular protocol, type\n\ |
| 165 | `help target ' followed by the protocol name.", |
| 166 | &targetlist, "target ", 0, &cmdlist); |
| 167 | add_cmd (t->to_shortname, no_class, t->to_open, t->to_doc, &targetlist); |
| 168 | } |
| 169 | |
| 170 | /* Stub functions */ |
| 171 | |
| 172 | static void |
| 173 | ignore () |
| 174 | { |
| 175 | } |
| 176 | |
| 177 | /* ARGSUSED */ |
| 178 | static int |
| 179 | nomemory (memaddr, myaddr, len, write) |
| 180 | CORE_ADDR memaddr; |
| 181 | char *myaddr; |
| 182 | int len; |
| 183 | int write; |
| 184 | { |
| 185 | errno = EIO; /* Can't read/write this location */ |
| 186 | return 0; /* No bytes handled */ |
| 187 | } |
| 188 | |
| 189 | static void |
| 190 | tcomplain () |
| 191 | { |
| 192 | error ("You can't do that when your target is `%s'", |
| 193 | current_target->to_shortname); |
| 194 | } |
| 195 | |
| 196 | void |
| 197 | noprocess () |
| 198 | { |
| 199 | error ("You can't do that without a process to debug"); |
| 200 | } |
| 201 | |
| 202 | /* ARGSUSED */ |
| 203 | static int |
| 204 | nosymbol (name, addrp) |
| 205 | char *name; |
| 206 | CORE_ADDR *addrp; |
| 207 | { |
| 208 | return 1; /* Symbol does not exist in target env */ |
| 209 | } |
| 210 | |
| 211 | /* ARGSUSED */ |
| 212 | static void |
| 213 | default_terminal_info (args, from_tty) |
| 214 | char *args; |
| 215 | int from_tty; |
| 216 | { |
| 217 | printf("No saved terminal information.\n"); |
| 218 | } |
| 219 | |
| 220 | #if 0 |
| 221 | /* With strata, this function is no longer needed. FIXME. */ |
| 222 | /* This is the default target_create_inferior function. It looks up |
| 223 | the stack for some target that cares to create inferiors, then |
| 224 | calls it -- or complains if not found. */ |
| 225 | |
| 226 | static void |
| 227 | upstack_create_inferior (exec, args, env) |
| 228 | char *exec; |
| 229 | char *args; |
| 230 | char **env; |
| 231 | { |
| 232 | struct target_ops *t; |
| 233 | |
| 234 | for (t = current_target; |
| 235 | t; |
| 236 | t = t->to_next) |
| 237 | { |
| 238 | if (t->to_create_inferior != upstack_create_inferior) |
| 239 | { |
| 240 | t->to_create_inferior (exec, args, env); |
| 241 | return; |
| 242 | } |
| 243 | |
| 244 | } |
| 245 | tcomplain(); |
| 246 | } |
| 247 | #endif |
| 248 | |
| 249 | /* This is the default target_create_inferior and target_attach function. |
| 250 | If the current target is executing, it asks whether to kill it off. |
| 251 | If this function returns without calling error(), it has killed off |
| 252 | the target, and the operation should be attempted. */ |
| 253 | |
| 254 | static void |
| 255 | kill_or_be_killed (from_tty) |
| 256 | int from_tty; |
| 257 | { |
| 258 | if (target_has_execution) |
| 259 | { |
| 260 | printf ("You are already running a program:\n"); |
| 261 | target_files_info (); |
| 262 | if (query ("Kill it? ")) { |
| 263 | target_kill (); |
| 264 | if (target_has_execution) |
| 265 | error ("Killing the program did not help."); |
| 266 | return; |
| 267 | } else { |
| 268 | error ("Program not killed."); |
| 269 | } |
| 270 | } |
| 271 | tcomplain(); |
| 272 | } |
| 273 | |
| 274 | static void |
| 275 | maybe_kill_then_attach (args, from_tty) |
| 276 | char *args; |
| 277 | int from_tty; |
| 278 | { |
| 279 | kill_or_be_killed (from_tty); |
| 280 | target_attach (args, from_tty); |
| 281 | } |
| 282 | |
| 283 | static void |
| 284 | maybe_kill_then_create_inferior (exec, args, env) |
| 285 | char *exec; |
| 286 | char *args; |
| 287 | char **env; |
| 288 | { |
| 289 | kill_or_be_killed (0); |
| 290 | target_create_inferior (exec, args, env); |
| 291 | } |
| 292 | |
| 293 | /* Clean up a target struct so it no longer has any zero pointers in it. |
| 294 | We default entries, at least to stubs that print error messages. */ |
| 295 | |
| 296 | static void |
| 297 | cleanup_target (t) |
| 298 | struct target_ops *t; |
| 299 | { |
| 300 | |
| 301 | /* Check magic number. If wrong, it probably means someone changed |
| 302 | the struct definition, but not all the places that initialize one. */ |
| 303 | if (t->to_magic != OPS_MAGIC) |
| 304 | { |
| 305 | fprintf(stderr, "Magic number of %s target struct wrong\n", |
| 306 | t->to_shortname); |
| 307 | abort(); |
| 308 | } |
| 309 | |
| 310 | #define de_fault(field, value) \ |
| 311 | if (!t->field) t->field = value |
| 312 | |
| 313 | /* FIELD DEFAULT VALUE */ |
| 314 | |
| 315 | de_fault (to_open, (void (*)())tcomplain); |
| 316 | de_fault (to_close, (void (*)())ignore); |
| 317 | de_fault (to_attach, maybe_kill_then_attach); |
| 318 | de_fault (to_detach, (void (*)())ignore); |
| 319 | de_fault (to_resume, (void (*)())noprocess); |
| 320 | de_fault (to_wait, (int (*)())noprocess); |
| 321 | de_fault (to_fetch_registers, (void (*)())ignore); |
| 322 | de_fault (to_store_registers, (void (*)())noprocess); |
| 323 | de_fault (to_prepare_to_store, (void (*)())noprocess); |
| 324 | de_fault (to_xfer_memory, (int (*)())nomemory); |
| 325 | de_fault (to_files_info, (void (*)())ignore); |
| 326 | de_fault (to_insert_breakpoint, memory_insert_breakpoint); |
| 327 | de_fault (to_remove_breakpoint, memory_remove_breakpoint); |
| 328 | de_fault (to_terminal_init, ignore); |
| 329 | de_fault (to_terminal_inferior, ignore); |
| 330 | de_fault (to_terminal_ours_for_output,ignore); |
| 331 | de_fault (to_terminal_ours, ignore); |
| 332 | de_fault (to_terminal_info, default_terminal_info); |
| 333 | de_fault (to_kill, (void (*)())noprocess); |
| 334 | de_fault (to_load, (void (*)())tcomplain); |
| 335 | de_fault (to_lookup_symbol, nosymbol); |
| 336 | de_fault (to_create_inferior, maybe_kill_then_create_inferior); |
| 337 | de_fault (to_mourn_inferior, (void (*)())noprocess); |
| 338 | de_fault (to_can_run, return_zero); |
| 339 | de_fault (to_notice_signals, (void (*)())ignore); |
| 340 | de_fault (to_next, 0); |
| 341 | de_fault (to_has_all_memory, 0); |
| 342 | de_fault (to_has_memory, 0); |
| 343 | de_fault (to_has_stack, 0); |
| 344 | de_fault (to_has_registers, 0); |
| 345 | de_fault (to_has_execution, 0); |
| 346 | |
| 347 | #undef de_fault |
| 348 | } |
| 349 | |
| 350 | /* Push a new target type into the stack of the existing target accessors, |
| 351 | possibly superseding some of the existing accessors. |
| 352 | |
| 353 | Result is zero if the pushed target ended up on top of the stack, |
| 354 | nonzero if at least one target is on top of it. |
| 355 | |
| 356 | Rather than allow an empty stack, we always have the dummy target at |
| 357 | the bottom stratum, so we can call the function vectors without |
| 358 | checking them. */ |
| 359 | |
| 360 | int |
| 361 | push_target (t) |
| 362 | struct target_ops *t; |
| 363 | { |
| 364 | struct target_ops *st, *prev; |
| 365 | |
| 366 | for (prev = 0, st = current_target; |
| 367 | st; |
| 368 | prev = st, st = st->to_next) { |
| 369 | if ((int)(t->to_stratum) >= (int)(st->to_stratum)) |
| 370 | break; |
| 371 | } |
| 372 | |
| 373 | while (t->to_stratum == st->to_stratum) { |
| 374 | /* There's already something on this stratum. Close it off. */ |
| 375 | (st->to_close) (0); |
| 376 | if (prev) |
| 377 | prev->to_next = st->to_next; /* Unchain old target_ops */ |
| 378 | else |
| 379 | current_target = st->to_next; /* Unchain first on list */ |
| 380 | st = st->to_next; |
| 381 | } |
| 382 | |
| 383 | /* We have removed all targets in our stratum, now add ourself. */ |
| 384 | t->to_next = st; |
| 385 | if (prev) |
| 386 | prev->to_next = t; |
| 387 | else |
| 388 | current_target = t; |
| 389 | |
| 390 | cleanup_target (current_target); |
| 391 | return prev != 0; |
| 392 | } |
| 393 | |
| 394 | /* Remove a target_ops vector from the stack, wherever it may be. |
| 395 | Return how many times it was removed (0 or 1 unless bug). */ |
| 396 | |
| 397 | int |
| 398 | unpush_target (t) |
| 399 | struct target_ops *t; |
| 400 | { |
| 401 | struct target_ops *u, *v; |
| 402 | int result = 0; |
| 403 | |
| 404 | for (u = current_target, v = 0; |
| 405 | u; |
| 406 | v = u, u = u->to_next) |
| 407 | if (u == t) |
| 408 | { |
| 409 | if (v == 0) |
| 410 | pop_target(); /* unchain top copy */ |
| 411 | else { |
| 412 | (t->to_close)(0); /* Let it clean up */ |
| 413 | v->to_next = t->to_next; /* unchain middle copy */ |
| 414 | } |
| 415 | result++; |
| 416 | } |
| 417 | return result; |
| 418 | } |
| 419 | |
| 420 | void |
| 421 | pop_target () |
| 422 | { |
| 423 | (current_target->to_close)(0); /* Let it clean up */ |
| 424 | current_target = current_target->to_next; |
| 425 | #if 0 |
| 426 | /* This will dump core if ever called--push_target expects current_target |
| 427 | to be non-NULL. But I don't think it's needed; I don't see how the |
| 428 | dummy_target could ever be removed from the stack. */ |
| 429 | if (!current_target) /* At bottom, push dummy. */ |
| 430 | push_target (&dummy_target); |
| 431 | #endif |
| 432 | } |
| 433 | |
| 434 | #undef MIN |
| 435 | #define MIN(A, B) (((A) <= (B)) ? (A) : (B)) |
| 436 | |
| 437 | /* target_read_string -- read a null terminated string from MEMADDR in target. |
| 438 | The read may also be terminated early by getting an error from target_xfer_ |
| 439 | memory. |
| 440 | LEN is the size of the buffer pointed to by MYADDR. Note that a terminating |
| 441 | null will only be written if there is sufficient room. The return value is |
| 442 | is the number of bytes (including the null) actually transferred. |
| 443 | */ |
| 444 | |
| 445 | int |
| 446 | target_read_string (memaddr, myaddr, len) |
| 447 | CORE_ADDR memaddr; |
| 448 | char *myaddr; |
| 449 | int len; |
| 450 | { |
| 451 | int tlen, origlen, offset, i; |
| 452 | char buf[4]; |
| 453 | |
| 454 | origlen = len; |
| 455 | |
| 456 | while (len > 0) |
| 457 | { |
| 458 | tlen = MIN (len, 4 - (memaddr & 3)); |
| 459 | offset = memaddr & 3; |
| 460 | |
| 461 | if (target_xfer_memory (memaddr & ~3, buf, 4, 0)) |
| 462 | return origlen - len; |
| 463 | |
| 464 | for (i = 0; i < tlen; i++) |
| 465 | { |
| 466 | *myaddr++ = buf[i + offset]; |
| 467 | if (buf[i + offset] == '\000') |
| 468 | return (origlen - len) + i + 1; |
| 469 | } |
| 470 | |
| 471 | memaddr += tlen; |
| 472 | len -= tlen; |
| 473 | } |
| 474 | return origlen; |
| 475 | } |
| 476 | |
| 477 | /* Read LEN bytes of target memory at address MEMADDR, placing the results in |
| 478 | GDB's memory at MYADDR. Returns either 0 for success or an errno value |
| 479 | if any error occurs. |
| 480 | |
| 481 | If an error occurs, no guarantee is made about the contents of the data at |
| 482 | MYADDR. In particular, the caller should not depend upon partial reads |
| 483 | filling the buffer with good data. There is no way for the caller to know |
| 484 | how much good data might have been transfered anyway. Callers that can |
| 485 | deal with partial reads should call target_read_memory_partial. */ |
| 486 | |
| 487 | int |
| 488 | target_read_memory (memaddr, myaddr, len) |
| 489 | CORE_ADDR memaddr; |
| 490 | char *myaddr; |
| 491 | int len; |
| 492 | { |
| 493 | return target_xfer_memory (memaddr, myaddr, len, 0); |
| 494 | } |
| 495 | |
| 496 | /* Read LEN bytes of target memory at address MEMADDR, placing the results |
| 497 | in GDB's memory at MYADDR. Returns a count of the bytes actually read, |
| 498 | and optionally an errno value in the location pointed to by ERRNOPTR |
| 499 | if ERRNOPTR is non-null. */ |
| 500 | |
| 501 | int |
| 502 | target_read_memory_partial (memaddr, myaddr, len, errnoptr) |
| 503 | CORE_ADDR memaddr; |
| 504 | char *myaddr; |
| 505 | int len; |
| 506 | int *errnoptr; |
| 507 | { |
| 508 | int nread; /* Number of bytes actually read. */ |
| 509 | int errcode; /* Error from last read. */ |
| 510 | |
| 511 | /* First try a complete read. */ |
| 512 | errcode = target_xfer_memory (memaddr, myaddr, len, 0); |
| 513 | if (errcode == 0) |
| 514 | { |
| 515 | /* Got it all. */ |
| 516 | nread = len; |
| 517 | } |
| 518 | else |
| 519 | { |
| 520 | /* Loop, reading one byte at a time until we get as much as we can. */ |
| 521 | for (errcode = 0, nread = 0; len > 0 && errcode == 0; nread++, len--) |
| 522 | { |
| 523 | errcode = target_xfer_memory (memaddr++, myaddr++, 1, 0); |
| 524 | } |
| 525 | /* If an error, the last read was unsuccessful, so adjust count. */ |
| 526 | if (errcode != 0) |
| 527 | { |
| 528 | nread--; |
| 529 | } |
| 530 | } |
| 531 | if (errnoptr != NULL) |
| 532 | { |
| 533 | *errnoptr = errcode; |
| 534 | } |
| 535 | return (nread); |
| 536 | } |
| 537 | |
| 538 | int |
| 539 | target_write_memory (memaddr, myaddr, len) |
| 540 | CORE_ADDR memaddr; |
| 541 | char *myaddr; |
| 542 | int len; |
| 543 | { |
| 544 | return target_xfer_memory (memaddr, myaddr, len, 1); |
| 545 | } |
| 546 | |
| 547 | /* Move memory to or from the targets. Iterate until all of it has |
| 548 | been moved, if necessary. The top target gets priority; anything |
| 549 | it doesn't want, is offered to the next one down, etc. Note the |
| 550 | business with curlen: if an early target says "no, but I have a |
| 551 | boundary overlapping this xfer" then we shorten what we offer to |
| 552 | the subsequent targets so the early guy will get a chance at the |
| 553 | tail before the subsequent ones do. |
| 554 | |
| 555 | Result is 0 or errno value. */ |
| 556 | |
| 557 | int |
| 558 | target_xfer_memory (memaddr, myaddr, len, write) |
| 559 | CORE_ADDR memaddr; |
| 560 | char *myaddr; |
| 561 | int len; |
| 562 | int write; |
| 563 | { |
| 564 | int curlen; |
| 565 | int res; |
| 566 | struct target_ops *t; |
| 567 | |
| 568 | /* to_xfer_memory is not guaranteed to set errno, even when it returns |
| 569 | 0. */ |
| 570 | errno = 0; |
| 571 | |
| 572 | /* The quick case is that the top target does it all. */ |
| 573 | res = current_target->to_xfer_memory |
| 574 | (memaddr, myaddr, len, write, current_target); |
| 575 | if (res == len) |
| 576 | return 0; |
| 577 | |
| 578 | if (res > 0) |
| 579 | goto bump; |
| 580 | /* If res <= 0 then we call it again in the loop. Ah well. */ |
| 581 | |
| 582 | for (; len > 0;) |
| 583 | { |
| 584 | curlen = len; /* Want to do it all */ |
| 585 | for (t = current_target; |
| 586 | t; |
| 587 | t = t->to_has_all_memory? 0: t->to_next) |
| 588 | { |
| 589 | res = t->to_xfer_memory(memaddr, myaddr, curlen, write, t); |
| 590 | if (res > 0) break; /* Handled all or part of xfer */ |
| 591 | if (res == 0) continue; /* Handled none */ |
| 592 | curlen = -res; /* Could handle once we get past res bytes */ |
| 593 | } |
| 594 | if (res <= 0) |
| 595 | { |
| 596 | /* If this address is for nonexistent memory, |
| 597 | read zeros if reading, or do nothing if writing. Return error. */ |
| 598 | if (!write) |
| 599 | memset (myaddr, 0, len); |
| 600 | if (errno == 0) |
| 601 | return EIO; |
| 602 | else |
| 603 | return errno; |
| 604 | } |
| 605 | bump: |
| 606 | memaddr += res; |
| 607 | myaddr += res; |
| 608 | len -= res; |
| 609 | } |
| 610 | return 0; /* We managed to cover it all somehow. */ |
| 611 | } |
| 612 | |
| 613 | |
| 614 | /* ARGSUSED */ |
| 615 | static void |
| 616 | target_info (args, from_tty) |
| 617 | char *args; |
| 618 | int from_tty; |
| 619 | { |
| 620 | struct target_ops *t; |
| 621 | int has_all_mem = 0; |
| 622 | |
| 623 | if (symfile_objfile != NULL) |
| 624 | printf ("Symbols from \"%s\".\n", symfile_objfile->name); |
| 625 | |
| 626 | #ifdef FILES_INFO_HOOK |
| 627 | if (FILES_INFO_HOOK ()) |
| 628 | return; |
| 629 | #endif |
| 630 | |
| 631 | for (t = current_target; |
| 632 | t; |
| 633 | t = t->to_next) |
| 634 | { |
| 635 | if ((int)(t->to_stratum) <= (int)dummy_stratum) |
| 636 | continue; |
| 637 | if (has_all_mem) |
| 638 | printf("\tWhile running this, gdb does not access memory from...\n"); |
| 639 | printf("%s:\n", t->to_longname); |
| 640 | (t->to_files_info)(t); |
| 641 | has_all_mem = t->to_has_all_memory; |
| 642 | } |
| 643 | } |
| 644 | |
| 645 | /* This is to be called by the open routine before it does |
| 646 | anything. */ |
| 647 | |
| 648 | void |
| 649 | target_preopen (from_tty) |
| 650 | int from_tty; |
| 651 | { |
| 652 | dont_repeat(); |
| 653 | |
| 654 | if (target_has_execution) |
| 655 | { |
| 656 | if (query ("A program is being debugged already. Kill it? ")) |
| 657 | target_kill (); |
| 658 | else |
| 659 | error ("Program not killed."); |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | /* Detach a target after doing deferred register stores. */ |
| 664 | |
| 665 | void |
| 666 | target_detach (args, from_tty) |
| 667 | char *args; |
| 668 | int from_tty; |
| 669 | { |
| 670 | /* Handle any optimized stores to the inferior. */ |
| 671 | #ifdef DO_DEFERRED_STORES |
| 672 | DO_DEFERRED_STORES; |
| 673 | #endif |
| 674 | (current_target->to_detach) (args, from_tty); |
| 675 | |
| 676 | /* It is correct to do this because the top process can never be as high |
| 677 | as process_stratum now. This is needed at least in the case where |
| 678 | we detach a corefile, and thus need to flush the frame cache. */ |
| 679 | generic_mourn_inferior (); |
| 680 | } |
| 681 | |
| 682 | /* Look through the list of possible targets for a target that can |
| 683 | execute a run or attach command without any other data. This is |
| 684 | used to locate the default process stratum. |
| 685 | |
| 686 | Result is always valid (error() is called for errors). */ |
| 687 | |
| 688 | static struct target_ops * |
| 689 | find_default_run_target (do_mesg) |
| 690 | char *do_mesg; |
| 691 | { |
| 692 | struct target_ops **t; |
| 693 | struct target_ops *runable = NULL; |
| 694 | int count; |
| 695 | |
| 696 | count = 0; |
| 697 | |
| 698 | for (t = target_structs; t < target_structs + target_struct_size; |
| 699 | ++t) |
| 700 | { |
| 701 | if (target_can_run(*t)) |
| 702 | { |
| 703 | runable = *t; |
| 704 | ++count; |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | if (count != 1) |
| 709 | error ("Don't know how to %s. Try \"help target\".", do_mesg); |
| 710 | |
| 711 | return runable; |
| 712 | } |
| 713 | |
| 714 | void |
| 715 | find_default_attach (args, from_tty) |
| 716 | char *args; |
| 717 | int from_tty; |
| 718 | { |
| 719 | struct target_ops *t; |
| 720 | |
| 721 | t = find_default_run_target("attach"); |
| 722 | (t->to_attach) (args, from_tty); |
| 723 | return; |
| 724 | } |
| 725 | |
| 726 | void |
| 727 | find_default_create_inferior (exec_file, allargs, env) |
| 728 | char *exec_file; |
| 729 | char *allargs; |
| 730 | char **env; |
| 731 | { |
| 732 | struct target_ops *t; |
| 733 | |
| 734 | t = find_default_run_target("run"); |
| 735 | (t->to_create_inferior) (exec_file, allargs, env); |
| 736 | return; |
| 737 | } |
| 738 | |
| 739 | static int |
| 740 | return_zero () |
| 741 | { |
| 742 | return 0; |
| 743 | } |
| 744 | |
| 745 | struct target_ops * |
| 746 | find_core_target () |
| 747 | { |
| 748 | struct target_ops **t; |
| 749 | struct target_ops *runable = NULL; |
| 750 | int count; |
| 751 | |
| 752 | count = 0; |
| 753 | |
| 754 | for (t = target_structs; t < target_structs + target_struct_size; |
| 755 | ++t) |
| 756 | { |
| 757 | if ((*t)->to_stratum == core_stratum) |
| 758 | { |
| 759 | runable = *t; |
| 760 | ++count; |
| 761 | } |
| 762 | } |
| 763 | |
| 764 | return(count == 1 ? runable : NULL); |
| 765 | } |
| 766 | |
| 767 | /* Convert a normal process ID to a string. Returns the string in a static |
| 768 | buffer. */ |
| 769 | |
| 770 | char * |
| 771 | normal_pid_to_str (pid) |
| 772 | int pid; |
| 773 | { |
| 774 | static char buf[30]; |
| 775 | |
| 776 | sprintf (buf, "process %d", pid); |
| 777 | |
| 778 | return buf; |
| 779 | } |
| 780 | |
| 781 | static char targ_desc[] = |
| 782 | "Names of targets and files being debugged.\n\ |
| 783 | Shows the entire stack of targets currently in use (including the exec-file,\n\ |
| 784 | core-file, and process, if any), as well as the symbol file name."; |
| 785 | |
| 786 | void |
| 787 | _initialize_targets () |
| 788 | { |
| 789 | current_target = &dummy_target; |
| 790 | cleanup_target (current_target); |
| 791 | |
| 792 | add_info ("target", target_info, targ_desc); |
| 793 | add_info ("files", target_info, targ_desc); |
| 794 | } |