Commit | Line | Data |
---|---|---|
bd5635a1 | 1 | /* Select target systems and architectures at runtime for GDB. |
49781499 | 2 | Copyright 1990, 1992, 1993 Free Software Foundation, Inc. |
bd5635a1 RP |
3 | Contributed by Cygnus Support. |
4 | ||
5 | This file is part of GDB. | |
6 | ||
e17960fb | 7 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 8 | it under the terms of the GNU General Public License as published by |
e17960fb JG |
9 | the Free Software Foundation; either version 2 of the License, or |
10 | (at your option) any later version. | |
bd5635a1 | 11 | |
e17960fb | 12 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
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 | |
e17960fb JG |
18 | along with this program; if not, write to the Free Software |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
bd5635a1 | 20 | |
80d68b1d | 21 | #include "defs.h" |
bd5635a1 RP |
22 | #include <errno.h> |
23 | #include <ctype.h> | |
bd5635a1 RP |
24 | #include "target.h" |
25 | #include "gdbcmd.h" | |
26 | #include "symtab.h" | |
27 | #include "inferior.h" | |
28 | #include "bfd.h" | |
29 | #include "symfile.h" | |
51b57ded | 30 | #include "objfiles.h" |
bd5635a1 | 31 | |
e17960fb JG |
32 | extern int errno; |
33 | ||
7919c3ed JG |
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 | ||
7919c3ed JG |
55 | static void |
56 | tcomplain PARAMS ((void)); | |
57 | ||
58 | static int | |
59 | nomemory PARAMS ((CORE_ADDR, char *, int, int)); | |
60 | ||
597dc86b SG |
61 | static int |
62 | return_zero PARAMS ((void)); | |
63 | ||
7919c3ed JG |
64 | static void |
65 | ignore PARAMS ((void)); | |
597dc86b | 66 | |
7919c3ed JG |
67 | static void |
68 | target_command PARAMS ((char *, int)); | |
bd5635a1 | 69 | |
597dc86b SG |
70 | static struct target_ops * |
71 | find_default_run_target PARAMS ((char *)); | |
72 | ||
bd5635a1 RP |
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 | ||
f2fc6e7a | 85 | struct target_ops dummy_target = {"None", "None", "", |
597dc86b SG |
86 | 0, 0, /* open, close */ |
87 | find_default_attach, 0, /* attach, detach */ | |
bd5635a1 | 88 | 0, 0, /* resume, wait */ |
dcc8abce | 89 | 0, 0, 0, /* registers */ |
bd5635a1 RP |
90 | 0, 0, /* memory */ |
91 | 0, 0, /* bkpts */ | |
92 | 0, 0, 0, 0, 0, /* terminal */ | |
fc47a10d | 93 | 0, 0, /* kill, load */ |
e17960fb | 94 | 0, /* lookup_symbol */ |
597dc86b SG |
95 | find_default_create_inferior, /* create_inferior */ |
96 | 0, /* mourn_inferior */ | |
97 | 0, /* can_run */ | |
49781499 | 98 | 0, /* notice_signals */ |
bd5635a1 RP |
99 | dummy_stratum, 0, /* stratum, next */ |
100 | 0, 0, 0, 0, 0, /* all mem, mem, stack, regs, exec */ | |
e17960fb | 101 | 0, 0, /* section pointers */ |
bd5635a1 RP |
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 | ||
f2fc6e7a JK |
114 | /* Command list for target. */ |
115 | ||
116 | static struct cmd_list_element *targetlist = NULL; | |
117 | ||
f2fc6e7a JK |
118 | /* The user just typed 'target' without the name of a target. */ |
119 | ||
e1ce8aa5 | 120 | /* ARGSUSED */ |
f2fc6e7a JK |
121 | static void |
122 | target_command (arg, from_tty) | |
123 | char *arg; | |
124 | int from_tty; | |
125 | { | |
597dc86b SG |
126 | fputs_filtered ("Argument required (target name). Try `help target'\n", |
127 | stdout); | |
f2fc6e7a | 128 | } |
bd5635a1 RP |
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 | { | |
597dc86b | 138 | fprintf(stderr, "Magic number of %s target struct wrong\n", |
bd5635a1 RP |
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; | |
7919c3ed JG |
152 | target_structs = (struct target_ops **) |
153 | xrealloc ((char *) target_structs, | |
154 | target_struct_allocsize * sizeof (*target_structs)); | |
bd5635a1 RP |
155 | } |
156 | target_structs[target_struct_size++] = t; | |
157 | cleanup_target (t); | |
f2fc6e7a JK |
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); | |
bd5635a1 RP |
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 | { | |
51b57ded | 185 | errno = EIO; /* Can't read/write this location */ |
bd5635a1 RP |
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 | ||
80d68b1d | 196 | void |
bd5635a1 RP |
197 | noprocess () |
198 | { | |
199 | error ("You can't do that without a process to debug"); | |
200 | } | |
201 | ||
e1ce8aa5 | 202 | /* ARGSUSED */ |
bd5635a1 RP |
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 | ||
e1ce8aa5 | 211 | /* ARGSUSED */ |
bd5635a1 RP |
212 | static void |
213 | default_terminal_info (args, from_tty) | |
214 | char *args; | |
215 | int from_tty; | |
216 | { | |
597dc86b | 217 | printf("No saved terminal information.\n"); |
bd5635a1 RP |
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 | { | |
bd5635a1 RP |
258 | if (target_has_execution) |
259 | { | |
597dc86b | 260 | printf ("You are already running a program:\n"); |
bd5635a1 RP |
261 | target_files_info (); |
262 | if (query ("Kill it? ")) { | |
e17960fb | 263 | target_kill (); |
bd5635a1 RP |
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 | { | |
597dc86b | 305 | fprintf(stderr, "Magic number of %s target struct wrong\n", |
bd5635a1 RP |
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 | ||
7919c3ed | 315 | de_fault (to_open, (void (*)())tcomplain); |
bd5635a1 RP |
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); | |
7919c3ed JG |
320 | de_fault (to_wait, (int (*)())noprocess); |
321 | de_fault (to_fetch_registers, (void (*)())ignore); | |
e17960fb | 322 | de_fault (to_store_registers, (void (*)())noprocess); |
bd5635a1 | 323 | de_fault (to_prepare_to_store, (void (*)())noprocess); |
7919c3ed JG |
324 | de_fault (to_xfer_memory, (int (*)())nomemory); |
325 | de_fault (to_files_info, (void (*)())ignore); | |
bd5635a1 RP |
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); | |
7919c3ed | 334 | de_fault (to_load, (void (*)())tcomplain); |
bd5635a1 RP |
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); | |
597dc86b | 338 | de_fault (to_can_run, return_zero); |
49781499 | 339 | de_fault (to_notice_signals, (void (*)())ignore); |
bd5635a1 RP |
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; | |
49781499 JK |
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. */ | |
bd5635a1 RP |
429 | if (!current_target) /* At bottom, push dummy. */ |
430 | push_target (&dummy_target); | |
49781499 | 431 | #endif |
bd5635a1 RP |
432 | } |
433 | ||
49781499 | 434 | #undef MIN |
e17960fb JG |
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 | ||
49781499 JK |
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. | |
bd5635a1 | 480 | |
49781499 JK |
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. */ | |
bd5635a1 RP |
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 | ||
49781499 JK |
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 | ||
bd5635a1 RP |
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 | ||
49781499 JK |
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 | ||
bd5635a1 RP |
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; | |
49781499 JK |
567 | |
568 | /* to_xfer_memory is not guaranteed to set errno, even when it returns | |
569 | 0. */ | |
570 | errno = 0; | |
571 | ||
bd5635a1 | 572 | /* The quick case is that the top target does it all. */ |
e17960fb JG |
573 | res = current_target->to_xfer_memory |
574 | (memaddr, myaddr, len, write, current_target); | |
bd5635a1 RP |
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 | { | |
e17960fb | 589 | res = t->to_xfer_memory(memaddr, myaddr, curlen, write, t); |
bd5635a1 RP |
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) | |
a8e033f2 | 599 | memset (myaddr, 0, len); |
e17960fb JG |
600 | if (errno == 0) |
601 | return EIO; | |
602 | else | |
603 | return errno; | |
bd5635a1 RP |
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 | ||
e1ce8aa5 | 614 | /* ARGSUSED */ |
bd5635a1 RP |
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 | ||
80d68b1d | 623 | if (symfile_objfile != NULL) |
597dc86b | 624 | printf ("Symbols from \"%s\".\n", symfile_objfile->name); |
bd5635a1 RP |
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) | |
597dc86b SG |
638 | printf("\tWhile running this, gdb does not access memory from...\n"); |
639 | printf("%s:\n", t->to_longname); | |
e17960fb | 640 | (t->to_files_info)(t); |
bd5635a1 RP |
641 | has_all_mem = t->to_has_all_memory; |
642 | } | |
643 | } | |
644 | ||
f2fc6e7a JK |
645 | /* This is to be called by the open routine before it does |
646 | anything. */ | |
bd5635a1 | 647 | |
f2fc6e7a JK |
648 | void |
649 | target_preopen (from_tty) | |
bd5635a1 RP |
650 | int from_tty; |
651 | { | |
bd5635a1 RP |
652 | dont_repeat(); |
653 | ||
bd5635a1 RP |
654 | if (target_has_execution) |
655 | { | |
656 | if (query ("A program is being debugged already. Kill it? ")) | |
e17960fb | 657 | target_kill (); |
bd5635a1 RP |
658 | else |
659 | error ("Program not killed."); | |
660 | } | |
bd5635a1 RP |
661 | } |
662 | ||
49781499 JK |
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 | ||
597dc86b SG |
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; | |
49781499 | 693 | struct target_ops *runable = NULL; |
597dc86b SG |
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 | ||
49781499 JK |
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 | ||
bd5635a1 RP |
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 | ||
bd5635a1 RP |
792 | add_info ("target", target_info, targ_desc); |
793 | add_info ("files", target_info, targ_desc); | |
bd5635a1 | 794 | } |