| 1 | /* Target-struct-independent code to start (run) and stop an inferior |
| 2 | process. |
| 3 | |
| 4 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
| 5 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| 6 | Free Software Foundation, Inc. |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 23 | Boston, MA 02110-1301, USA. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "gdb_string.h" |
| 27 | #include <ctype.h> |
| 28 | #include "symtab.h" |
| 29 | #include "frame.h" |
| 30 | #include "inferior.h" |
| 31 | #include "exceptions.h" |
| 32 | #include "breakpoint.h" |
| 33 | #include "gdb_wait.h" |
| 34 | #include "gdbcore.h" |
| 35 | #include "gdbcmd.h" |
| 36 | #include "cli/cli-script.h" |
| 37 | #include "target.h" |
| 38 | #include "gdbthread.h" |
| 39 | #include "annotate.h" |
| 40 | #include "symfile.h" |
| 41 | #include "top.h" |
| 42 | #include <signal.h> |
| 43 | #include "inf-loop.h" |
| 44 | #include "regcache.h" |
| 45 | #include "value.h" |
| 46 | #include "observer.h" |
| 47 | #include "language.h" |
| 48 | #include "solib.h" |
| 49 | #include "main.h" |
| 50 | |
| 51 | #include "gdb_assert.h" |
| 52 | #include "mi/mi-common.h" |
| 53 | |
| 54 | /* Prototypes for local functions */ |
| 55 | |
| 56 | static void signals_info (char *, int); |
| 57 | |
| 58 | static void handle_command (char *, int); |
| 59 | |
| 60 | static void sig_print_info (enum target_signal); |
| 61 | |
| 62 | static void sig_print_header (void); |
| 63 | |
| 64 | static void resume_cleanups (void *); |
| 65 | |
| 66 | static int hook_stop_stub (void *); |
| 67 | |
| 68 | static int restore_selected_frame (void *); |
| 69 | |
| 70 | static void build_infrun (void); |
| 71 | |
| 72 | static int follow_fork (void); |
| 73 | |
| 74 | static void set_schedlock_func (char *args, int from_tty, |
| 75 | struct cmd_list_element *c); |
| 76 | |
| 77 | struct execution_control_state; |
| 78 | |
| 79 | static int currently_stepping (struct execution_control_state *ecs); |
| 80 | |
| 81 | static void xdb_handle_command (char *args, int from_tty); |
| 82 | |
| 83 | static int prepare_to_proceed (void); |
| 84 | |
| 85 | void _initialize_infrun (void); |
| 86 | |
| 87 | int inferior_ignoring_startup_exec_events = 0; |
| 88 | int inferior_ignoring_leading_exec_events = 0; |
| 89 | |
| 90 | /* When set, stop the 'step' command if we enter a function which has |
| 91 | no line number information. The normal behavior is that we step |
| 92 | over such function. */ |
| 93 | int step_stop_if_no_debug = 0; |
| 94 | static void |
| 95 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, |
| 96 | struct cmd_list_element *c, const char *value) |
| 97 | { |
| 98 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); |
| 99 | } |
| 100 | |
| 101 | /* In asynchronous mode, but simulating synchronous execution. */ |
| 102 | |
| 103 | int sync_execution = 0; |
| 104 | |
| 105 | /* wait_for_inferior and normal_stop use this to notify the user |
| 106 | when the inferior stopped in a different thread than it had been |
| 107 | running in. */ |
| 108 | |
| 109 | static ptid_t previous_inferior_ptid; |
| 110 | |
| 111 | /* This is true for configurations that may follow through execl() and |
| 112 | similar functions. At present this is only true for HP-UX native. */ |
| 113 | |
| 114 | #ifndef MAY_FOLLOW_EXEC |
| 115 | #define MAY_FOLLOW_EXEC (0) |
| 116 | #endif |
| 117 | |
| 118 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
| 119 | |
| 120 | static int debug_infrun = 0; |
| 121 | static void |
| 122 | show_debug_infrun (struct ui_file *file, int from_tty, |
| 123 | struct cmd_list_element *c, const char *value) |
| 124 | { |
| 125 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); |
| 126 | } |
| 127 | |
| 128 | /* If the program uses ELF-style shared libraries, then calls to |
| 129 | functions in shared libraries go through stubs, which live in a |
| 130 | table called the PLT (Procedure Linkage Table). The first time the |
| 131 | function is called, the stub sends control to the dynamic linker, |
| 132 | which looks up the function's real address, patches the stub so |
| 133 | that future calls will go directly to the function, and then passes |
| 134 | control to the function. |
| 135 | |
| 136 | If we are stepping at the source level, we don't want to see any of |
| 137 | this --- we just want to skip over the stub and the dynamic linker. |
| 138 | The simple approach is to single-step until control leaves the |
| 139 | dynamic linker. |
| 140 | |
| 141 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
| 142 | dynamic linker calls functions in the shared C library, so you |
| 143 | can't tell from the PC alone whether the dynamic linker is still |
| 144 | running. In this case, we use a step-resume breakpoint to get us |
| 145 | past the dynamic linker, as if we were using "next" to step over a |
| 146 | function call. |
| 147 | |
| 148 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic |
| 149 | linker code or not. Normally, this means we single-step. However, |
| 150 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an |
| 151 | address where we can place a step-resume breakpoint to get past the |
| 152 | linker's symbol resolution function. |
| 153 | |
| 154 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a |
| 155 | pretty portable way, by comparing the PC against the address ranges |
| 156 | of the dynamic linker's sections. |
| 157 | |
| 158 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since |
| 159 | it depends on internal details of the dynamic linker. It's usually |
| 160 | not too hard to figure out where to put a breakpoint, but it |
| 161 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of |
| 162 | sanity checking. If it can't figure things out, returning zero and |
| 163 | getting the (possibly confusing) stepping behavior is better than |
| 164 | signalling an error, which will obscure the change in the |
| 165 | inferior's state. */ |
| 166 | |
| 167 | /* This function returns TRUE if pc is the address of an instruction |
| 168 | that lies within the dynamic linker (such as the event hook, or the |
| 169 | dld itself). |
| 170 | |
| 171 | This function must be used only when a dynamic linker event has |
| 172 | been caught, and the inferior is being stepped out of the hook, or |
| 173 | undefined results are guaranteed. */ |
| 174 | |
| 175 | #ifndef SOLIB_IN_DYNAMIC_LINKER |
| 176 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 |
| 177 | #endif |
| 178 | |
| 179 | |
| 180 | /* Convert the #defines into values. This is temporary until wfi control |
| 181 | flow is completely sorted out. */ |
| 182 | |
| 183 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
| 184 | #define CANNOT_STEP_HW_WATCHPOINTS 0 |
| 185 | #else |
| 186 | #undef CANNOT_STEP_HW_WATCHPOINTS |
| 187 | #define CANNOT_STEP_HW_WATCHPOINTS 1 |
| 188 | #endif |
| 189 | |
| 190 | /* Tables of how to react to signals; the user sets them. */ |
| 191 | |
| 192 | static unsigned char *signal_stop; |
| 193 | static unsigned char *signal_print; |
| 194 | static unsigned char *signal_program; |
| 195 | |
| 196 | #define SET_SIGS(nsigs,sigs,flags) \ |
| 197 | do { \ |
| 198 | int signum = (nsigs); \ |
| 199 | while (signum-- > 0) \ |
| 200 | if ((sigs)[signum]) \ |
| 201 | (flags)[signum] = 1; \ |
| 202 | } while (0) |
| 203 | |
| 204 | #define UNSET_SIGS(nsigs,sigs,flags) \ |
| 205 | do { \ |
| 206 | int signum = (nsigs); \ |
| 207 | while (signum-- > 0) \ |
| 208 | if ((sigs)[signum]) \ |
| 209 | (flags)[signum] = 0; \ |
| 210 | } while (0) |
| 211 | |
| 212 | /* Value to pass to target_resume() to cause all threads to resume */ |
| 213 | |
| 214 | #define RESUME_ALL (pid_to_ptid (-1)) |
| 215 | |
| 216 | /* Command list pointer for the "stop" placeholder. */ |
| 217 | |
| 218 | static struct cmd_list_element *stop_command; |
| 219 | |
| 220 | /* Nonzero if breakpoints are now inserted in the inferior. */ |
| 221 | |
| 222 | static int breakpoints_inserted; |
| 223 | |
| 224 | /* Function inferior was in as of last step command. */ |
| 225 | |
| 226 | static struct symbol *step_start_function; |
| 227 | |
| 228 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ |
| 229 | |
| 230 | static int trap_expected; |
| 231 | |
| 232 | /* Nonzero if we want to give control to the user when we're notified |
| 233 | of shared library events by the dynamic linker. */ |
| 234 | static int stop_on_solib_events; |
| 235 | static void |
| 236 | show_stop_on_solib_events (struct ui_file *file, int from_tty, |
| 237 | struct cmd_list_element *c, const char *value) |
| 238 | { |
| 239 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), |
| 240 | value); |
| 241 | } |
| 242 | |
| 243 | /* Nonzero means expecting a trace trap |
| 244 | and should stop the inferior and return silently when it happens. */ |
| 245 | |
| 246 | int stop_after_trap; |
| 247 | |
| 248 | /* Nonzero means expecting a trap and caller will handle it themselves. |
| 249 | It is used after attach, due to attaching to a process; |
| 250 | when running in the shell before the child program has been exec'd; |
| 251 | and when running some kinds of remote stuff (FIXME?). */ |
| 252 | |
| 253 | enum stop_kind stop_soon; |
| 254 | |
| 255 | /* Nonzero if proceed is being used for a "finish" command or a similar |
| 256 | situation when stop_registers should be saved. */ |
| 257 | |
| 258 | int proceed_to_finish; |
| 259 | |
| 260 | /* Save register contents here when about to pop a stack dummy frame, |
| 261 | if-and-only-if proceed_to_finish is set. |
| 262 | Thus this contains the return value from the called function (assuming |
| 263 | values are returned in a register). */ |
| 264 | |
| 265 | struct regcache *stop_registers; |
| 266 | |
| 267 | /* Nonzero after stop if current stack frame should be printed. */ |
| 268 | |
| 269 | static int stop_print_frame; |
| 270 | |
| 271 | static struct breakpoint *step_resume_breakpoint = NULL; |
| 272 | |
| 273 | /* This is a cached copy of the pid/waitstatus of the last event |
| 274 | returned by target_wait()/deprecated_target_wait_hook(). This |
| 275 | information is returned by get_last_target_status(). */ |
| 276 | static ptid_t target_last_wait_ptid; |
| 277 | static struct target_waitstatus target_last_waitstatus; |
| 278 | |
| 279 | /* This is used to remember when a fork, vfork or exec event |
| 280 | was caught by a catchpoint, and thus the event is to be |
| 281 | followed at the next resume of the inferior, and not |
| 282 | immediately. */ |
| 283 | static struct |
| 284 | { |
| 285 | enum target_waitkind kind; |
| 286 | struct |
| 287 | { |
| 288 | int parent_pid; |
| 289 | int child_pid; |
| 290 | } |
| 291 | fork_event; |
| 292 | char *execd_pathname; |
| 293 | } |
| 294 | pending_follow; |
| 295 | |
| 296 | static const char follow_fork_mode_child[] = "child"; |
| 297 | static const char follow_fork_mode_parent[] = "parent"; |
| 298 | |
| 299 | static const char *follow_fork_mode_kind_names[] = { |
| 300 | follow_fork_mode_child, |
| 301 | follow_fork_mode_parent, |
| 302 | NULL |
| 303 | }; |
| 304 | |
| 305 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
| 306 | static void |
| 307 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, |
| 308 | struct cmd_list_element *c, const char *value) |
| 309 | { |
| 310 | fprintf_filtered (file, _("\ |
| 311 | Debugger response to a program call of fork or vfork is \"%s\".\n"), |
| 312 | value); |
| 313 | } |
| 314 | \f |
| 315 | |
| 316 | static int |
| 317 | follow_fork (void) |
| 318 | { |
| 319 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
| 320 | |
| 321 | return target_follow_fork (follow_child); |
| 322 | } |
| 323 | |
| 324 | void |
| 325 | follow_inferior_reset_breakpoints (void) |
| 326 | { |
| 327 | /* Was there a step_resume breakpoint? (There was if the user |
| 328 | did a "next" at the fork() call.) If so, explicitly reset its |
| 329 | thread number. |
| 330 | |
| 331 | step_resumes are a form of bp that are made to be per-thread. |
| 332 | Since we created the step_resume bp when the parent process |
| 333 | was being debugged, and now are switching to the child process, |
| 334 | from the breakpoint package's viewpoint, that's a switch of |
| 335 | "threads". We must update the bp's notion of which thread |
| 336 | it is for, or it'll be ignored when it triggers. */ |
| 337 | |
| 338 | if (step_resume_breakpoint) |
| 339 | breakpoint_re_set_thread (step_resume_breakpoint); |
| 340 | |
| 341 | /* Reinsert all breakpoints in the child. The user may have set |
| 342 | breakpoints after catching the fork, in which case those |
| 343 | were never set in the child, but only in the parent. This makes |
| 344 | sure the inserted breakpoints match the breakpoint list. */ |
| 345 | |
| 346 | breakpoint_re_set (); |
| 347 | insert_breakpoints (); |
| 348 | } |
| 349 | |
| 350 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
| 351 | |
| 352 | static void |
| 353 | follow_exec (int pid, char *execd_pathname) |
| 354 | { |
| 355 | int saved_pid = pid; |
| 356 | struct target_ops *tgt; |
| 357 | |
| 358 | if (!may_follow_exec) |
| 359 | return; |
| 360 | |
| 361 | /* This is an exec event that we actually wish to pay attention to. |
| 362 | Refresh our symbol table to the newly exec'd program, remove any |
| 363 | momentary bp's, etc. |
| 364 | |
| 365 | If there are breakpoints, they aren't really inserted now, |
| 366 | since the exec() transformed our inferior into a fresh set |
| 367 | of instructions. |
| 368 | |
| 369 | We want to preserve symbolic breakpoints on the list, since |
| 370 | we have hopes that they can be reset after the new a.out's |
| 371 | symbol table is read. |
| 372 | |
| 373 | However, any "raw" breakpoints must be removed from the list |
| 374 | (e.g., the solib bp's), since their address is probably invalid |
| 375 | now. |
| 376 | |
| 377 | And, we DON'T want to call delete_breakpoints() here, since |
| 378 | that may write the bp's "shadow contents" (the instruction |
| 379 | value that was overwritten witha TRAP instruction). Since |
| 380 | we now have a new a.out, those shadow contents aren't valid. */ |
| 381 | update_breakpoints_after_exec (); |
| 382 | |
| 383 | /* If there was one, it's gone now. We cannot truly step-to-next |
| 384 | statement through an exec(). */ |
| 385 | step_resume_breakpoint = NULL; |
| 386 | step_range_start = 0; |
| 387 | step_range_end = 0; |
| 388 | |
| 389 | /* What is this a.out's name? */ |
| 390 | printf_unfiltered (_("Executing new program: %s\n"), execd_pathname); |
| 391 | |
| 392 | /* We've followed the inferior through an exec. Therefore, the |
| 393 | inferior has essentially been killed & reborn. */ |
| 394 | |
| 395 | /* First collect the run target in effect. */ |
| 396 | tgt = find_run_target (); |
| 397 | /* If we can't find one, things are in a very strange state... */ |
| 398 | if (tgt == NULL) |
| 399 | error (_("Could find run target to save before following exec")); |
| 400 | |
| 401 | gdb_flush (gdb_stdout); |
| 402 | target_mourn_inferior (); |
| 403 | inferior_ptid = pid_to_ptid (saved_pid); |
| 404 | /* Because mourn_inferior resets inferior_ptid. */ |
| 405 | push_target (tgt); |
| 406 | |
| 407 | /* That a.out is now the one to use. */ |
| 408 | exec_file_attach (execd_pathname, 0); |
| 409 | |
| 410 | /* And also is where symbols can be found. */ |
| 411 | symbol_file_add_main (execd_pathname, 0); |
| 412 | |
| 413 | /* Reset the shared library package. This ensures that we get |
| 414 | a shlib event when the child reaches "_start", at which point |
| 415 | the dld will have had a chance to initialize the child. */ |
| 416 | #if defined(SOLIB_RESTART) |
| 417 | SOLIB_RESTART (); |
| 418 | #endif |
| 419 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
| 420 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
| 421 | #else |
| 422 | solib_create_inferior_hook (); |
| 423 | #endif |
| 424 | |
| 425 | /* Reinsert all breakpoints. (Those which were symbolic have |
| 426 | been reset to the proper address in the new a.out, thanks |
| 427 | to symbol_file_command...) */ |
| 428 | insert_breakpoints (); |
| 429 | |
| 430 | /* The next resume of this inferior should bring it to the shlib |
| 431 | startup breakpoints. (If the user had also set bp's on |
| 432 | "main" from the old (parent) process, then they'll auto- |
| 433 | matically get reset there in the new process.) */ |
| 434 | } |
| 435 | |
| 436 | /* Non-zero if we just simulating a single-step. This is needed |
| 437 | because we cannot remove the breakpoints in the inferior process |
| 438 | until after the `wait' in `wait_for_inferior'. */ |
| 439 | static int singlestep_breakpoints_inserted_p = 0; |
| 440 | |
| 441 | /* The thread we inserted single-step breakpoints for. */ |
| 442 | static ptid_t singlestep_ptid; |
| 443 | |
| 444 | /* PC when we started this single-step. */ |
| 445 | static CORE_ADDR singlestep_pc; |
| 446 | |
| 447 | /* If another thread hit the singlestep breakpoint, we save the original |
| 448 | thread here so that we can resume single-stepping it later. */ |
| 449 | static ptid_t saved_singlestep_ptid; |
| 450 | static int stepping_past_singlestep_breakpoint; |
| 451 | \f |
| 452 | |
| 453 | /* Things to clean up if we QUIT out of resume (). */ |
| 454 | static void |
| 455 | resume_cleanups (void *ignore) |
| 456 | { |
| 457 | normal_stop (); |
| 458 | } |
| 459 | |
| 460 | static const char schedlock_off[] = "off"; |
| 461 | static const char schedlock_on[] = "on"; |
| 462 | static const char schedlock_step[] = "step"; |
| 463 | static const char *scheduler_enums[] = { |
| 464 | schedlock_off, |
| 465 | schedlock_on, |
| 466 | schedlock_step, |
| 467 | NULL |
| 468 | }; |
| 469 | static const char *scheduler_mode = schedlock_off; |
| 470 | static void |
| 471 | show_scheduler_mode (struct ui_file *file, int from_tty, |
| 472 | struct cmd_list_element *c, const char *value) |
| 473 | { |
| 474 | fprintf_filtered (file, _("\ |
| 475 | Mode for locking scheduler during execution is \"%s\".\n"), |
| 476 | value); |
| 477 | } |
| 478 | |
| 479 | static void |
| 480 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
| 481 | { |
| 482 | if (!target_can_lock_scheduler) |
| 483 | { |
| 484 | scheduler_mode = schedlock_off; |
| 485 | error (_("Target '%s' cannot support this command."), target_shortname); |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | |
| 490 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
| 491 | wants to interrupt some lengthy single-stepping operation |
| 492 | (for child processes, the SIGINT goes to the inferior, and so |
| 493 | we get a SIGINT random_signal, but for remote debugging and perhaps |
| 494 | other targets, that's not true). |
| 495 | |
| 496 | STEP nonzero if we should step (zero to continue instead). |
| 497 | SIG is the signal to give the inferior (zero for none). */ |
| 498 | void |
| 499 | resume (int step, enum target_signal sig) |
| 500 | { |
| 501 | int should_resume = 1; |
| 502 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
| 503 | QUIT; |
| 504 | |
| 505 | if (debug_infrun) |
| 506 | fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n", |
| 507 | step, sig); |
| 508 | |
| 509 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
| 510 | |
| 511 | |
| 512 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
| 513 | over an instruction that causes a page fault without triggering |
| 514 | a hardware watchpoint. The kernel properly notices that it shouldn't |
| 515 | stop, because the hardware watchpoint is not triggered, but it forgets |
| 516 | the step request and continues the program normally. |
| 517 | Work around the problem by removing hardware watchpoints if a step is |
| 518 | requested, GDB will check for a hardware watchpoint trigger after the |
| 519 | step anyway. */ |
| 520 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) |
| 521 | remove_hw_watchpoints (); |
| 522 | |
| 523 | |
| 524 | /* Normally, by the time we reach `resume', the breakpoints are either |
| 525 | removed or inserted, as appropriate. The exception is if we're sitting |
| 526 | at a permanent breakpoint; we need to step over it, but permanent |
| 527 | breakpoints can't be removed. So we have to test for it here. */ |
| 528 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) |
| 529 | { |
| 530 | if (gdbarch_skip_permanent_breakpoint_p (current_gdbarch)) |
| 531 | gdbarch_skip_permanent_breakpoint (current_gdbarch, |
| 532 | get_current_regcache ()); |
| 533 | else |
| 534 | error (_("\ |
| 535 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
| 536 | how to step past a permanent breakpoint on this architecture. Try using\n\ |
| 537 | a command like `return' or `jump' to continue execution.")); |
| 538 | } |
| 539 | |
| 540 | if (step && gdbarch_software_single_step_p (current_gdbarch)) |
| 541 | { |
| 542 | /* Do it the hard way, w/temp breakpoints */ |
| 543 | if (gdbarch_software_single_step (current_gdbarch, get_current_frame ())) |
| 544 | { |
| 545 | /* ...and don't ask hardware to do it. */ |
| 546 | step = 0; |
| 547 | /* and do not pull these breakpoints until after a `wait' in |
| 548 | `wait_for_inferior' */ |
| 549 | singlestep_breakpoints_inserted_p = 1; |
| 550 | singlestep_ptid = inferior_ptid; |
| 551 | singlestep_pc = read_pc (); |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | /* If there were any forks/vforks/execs that were caught and are |
| 556 | now to be followed, then do so. */ |
| 557 | switch (pending_follow.kind) |
| 558 | { |
| 559 | case TARGET_WAITKIND_FORKED: |
| 560 | case TARGET_WAITKIND_VFORKED: |
| 561 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| 562 | if (follow_fork ()) |
| 563 | should_resume = 0; |
| 564 | break; |
| 565 | |
| 566 | case TARGET_WAITKIND_EXECD: |
| 567 | /* follow_exec is called as soon as the exec event is seen. */ |
| 568 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| 569 | break; |
| 570 | |
| 571 | default: |
| 572 | break; |
| 573 | } |
| 574 | |
| 575 | /* Install inferior's terminal modes. */ |
| 576 | target_terminal_inferior (); |
| 577 | |
| 578 | if (should_resume) |
| 579 | { |
| 580 | ptid_t resume_ptid; |
| 581 | |
| 582 | resume_ptid = RESUME_ALL; /* Default */ |
| 583 | |
| 584 | if ((step || singlestep_breakpoints_inserted_p) |
| 585 | && (stepping_past_singlestep_breakpoint |
| 586 | || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) |
| 587 | { |
| 588 | /* Stepping past a breakpoint without inserting breakpoints. |
| 589 | Make sure only the current thread gets to step, so that |
| 590 | other threads don't sneak past breakpoints while they are |
| 591 | not inserted. */ |
| 592 | |
| 593 | resume_ptid = inferior_ptid; |
| 594 | } |
| 595 | |
| 596 | if ((scheduler_mode == schedlock_on) |
| 597 | || (scheduler_mode == schedlock_step |
| 598 | && (step || singlestep_breakpoints_inserted_p))) |
| 599 | { |
| 600 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
| 601 | resume_ptid = inferior_ptid; |
| 602 | } |
| 603 | |
| 604 | if (gdbarch_cannot_step_breakpoint (current_gdbarch)) |
| 605 | { |
| 606 | /* Most targets can step a breakpoint instruction, thus |
| 607 | executing it normally. But if this one cannot, just |
| 608 | continue and we will hit it anyway. */ |
| 609 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) |
| 610 | step = 0; |
| 611 | } |
| 612 | target_resume (resume_ptid, step, sig); |
| 613 | } |
| 614 | |
| 615 | discard_cleanups (old_cleanups); |
| 616 | } |
| 617 | \f |
| 618 | |
| 619 | /* Clear out all variables saying what to do when inferior is continued. |
| 620 | First do this, then set the ones you want, then call `proceed'. */ |
| 621 | |
| 622 | void |
| 623 | clear_proceed_status (void) |
| 624 | { |
| 625 | trap_expected = 0; |
| 626 | step_range_start = 0; |
| 627 | step_range_end = 0; |
| 628 | step_frame_id = null_frame_id; |
| 629 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
| 630 | stop_after_trap = 0; |
| 631 | stop_soon = NO_STOP_QUIETLY; |
| 632 | proceed_to_finish = 0; |
| 633 | breakpoint_proceeded = 1; /* We're about to proceed... */ |
| 634 | |
| 635 | if (stop_registers) |
| 636 | { |
| 637 | regcache_xfree (stop_registers); |
| 638 | stop_registers = NULL; |
| 639 | } |
| 640 | |
| 641 | /* Discard any remaining commands or status from previous stop. */ |
| 642 | bpstat_clear (&stop_bpstat); |
| 643 | } |
| 644 | |
| 645 | /* This should be suitable for any targets that support threads. */ |
| 646 | |
| 647 | static int |
| 648 | prepare_to_proceed (void) |
| 649 | { |
| 650 | ptid_t wait_ptid; |
| 651 | struct target_waitstatus wait_status; |
| 652 | |
| 653 | /* Get the last target status returned by target_wait(). */ |
| 654 | get_last_target_status (&wait_ptid, &wait_status); |
| 655 | |
| 656 | /* Make sure we were stopped either at a breakpoint, or because |
| 657 | of a Ctrl-C. */ |
| 658 | if (wait_status.kind != TARGET_WAITKIND_STOPPED |
| 659 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
| 660 | && wait_status.value.sig != TARGET_SIGNAL_INT)) |
| 661 | { |
| 662 | return 0; |
| 663 | } |
| 664 | |
| 665 | if (!ptid_equal (wait_ptid, minus_one_ptid) |
| 666 | && !ptid_equal (inferior_ptid, wait_ptid)) |
| 667 | { |
| 668 | /* Switched over from WAIT_PID. */ |
| 669 | CORE_ADDR wait_pc = read_pc_pid (wait_ptid); |
| 670 | |
| 671 | if (wait_pc != read_pc ()) |
| 672 | { |
| 673 | /* Switch back to WAIT_PID thread. */ |
| 674 | inferior_ptid = wait_ptid; |
| 675 | |
| 676 | /* FIXME: This stuff came from switch_to_thread() in |
| 677 | thread.c (which should probably be a public function). */ |
| 678 | reinit_frame_cache (); |
| 679 | registers_changed (); |
| 680 | stop_pc = wait_pc; |
| 681 | } |
| 682 | |
| 683 | /* We return 1 to indicate that there is a breakpoint here, |
| 684 | so we need to step over it before continuing to avoid |
| 685 | hitting it straight away. */ |
| 686 | if (breakpoint_here_p (wait_pc)) |
| 687 | return 1; |
| 688 | } |
| 689 | |
| 690 | return 0; |
| 691 | |
| 692 | } |
| 693 | |
| 694 | /* Record the pc of the program the last time it stopped. This is |
| 695 | just used internally by wait_for_inferior, but need to be preserved |
| 696 | over calls to it and cleared when the inferior is started. */ |
| 697 | static CORE_ADDR prev_pc; |
| 698 | |
| 699 | /* Basic routine for continuing the program in various fashions. |
| 700 | |
| 701 | ADDR is the address to resume at, or -1 for resume where stopped. |
| 702 | SIGGNAL is the signal to give it, or 0 for none, |
| 703 | or -1 for act according to how it stopped. |
| 704 | STEP is nonzero if should trap after one instruction. |
| 705 | -1 means return after that and print nothing. |
| 706 | You should probably set various step_... variables |
| 707 | before calling here, if you are stepping. |
| 708 | |
| 709 | You should call clear_proceed_status before calling proceed. */ |
| 710 | |
| 711 | void |
| 712 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
| 713 | { |
| 714 | int oneproc = 0; |
| 715 | |
| 716 | if (step > 0) |
| 717 | step_start_function = find_pc_function (read_pc ()); |
| 718 | if (step < 0) |
| 719 | stop_after_trap = 1; |
| 720 | |
| 721 | if (addr == (CORE_ADDR) -1) |
| 722 | { |
| 723 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
| 724 | /* There is a breakpoint at the address we will resume at, |
| 725 | step one instruction before inserting breakpoints so that |
| 726 | we do not stop right away (and report a second hit at this |
| 727 | breakpoint). */ |
| 728 | oneproc = 1; |
| 729 | else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
| 730 | && gdbarch_single_step_through_delay (current_gdbarch, |
| 731 | get_current_frame ())) |
| 732 | /* We stepped onto an instruction that needs to be stepped |
| 733 | again before re-inserting the breakpoint, do so. */ |
| 734 | oneproc = 1; |
| 735 | } |
| 736 | else |
| 737 | { |
| 738 | write_pc (addr); |
| 739 | } |
| 740 | |
| 741 | if (debug_infrun) |
| 742 | fprintf_unfiltered (gdb_stdlog, |
| 743 | "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", |
| 744 | paddr_nz (addr), siggnal, step); |
| 745 | |
| 746 | /* In a multi-threaded task we may select another thread |
| 747 | and then continue or step. |
| 748 | |
| 749 | But if the old thread was stopped at a breakpoint, it |
| 750 | will immediately cause another breakpoint stop without |
| 751 | any execution (i.e. it will report a breakpoint hit |
| 752 | incorrectly). So we must step over it first. |
| 753 | |
| 754 | prepare_to_proceed checks the current thread against the thread |
| 755 | that reported the most recent event. If a step-over is required |
| 756 | it returns TRUE and sets the current thread to the old thread. */ |
| 757 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
| 758 | oneproc = 1; |
| 759 | |
| 760 | if (oneproc) |
| 761 | /* We will get a trace trap after one instruction. |
| 762 | Continue it automatically and insert breakpoints then. */ |
| 763 | trap_expected = 1; |
| 764 | else |
| 765 | { |
| 766 | insert_breakpoints (); |
| 767 | /* If we get here there was no call to error() in |
| 768 | insert breakpoints -- so they were inserted. */ |
| 769 | breakpoints_inserted = 1; |
| 770 | } |
| 771 | |
| 772 | if (siggnal != TARGET_SIGNAL_DEFAULT) |
| 773 | stop_signal = siggnal; |
| 774 | /* If this signal should not be seen by program, |
| 775 | give it zero. Used for debugging signals. */ |
| 776 | else if (!signal_program[stop_signal]) |
| 777 | stop_signal = TARGET_SIGNAL_0; |
| 778 | |
| 779 | annotate_starting (); |
| 780 | |
| 781 | /* Make sure that output from GDB appears before output from the |
| 782 | inferior. */ |
| 783 | gdb_flush (gdb_stdout); |
| 784 | |
| 785 | /* Refresh prev_pc value just prior to resuming. This used to be |
| 786 | done in stop_stepping, however, setting prev_pc there did not handle |
| 787 | scenarios such as inferior function calls or returning from |
| 788 | a function via the return command. In those cases, the prev_pc |
| 789 | value was not set properly for subsequent commands. The prev_pc value |
| 790 | is used to initialize the starting line number in the ecs. With an |
| 791 | invalid value, the gdb next command ends up stopping at the position |
| 792 | represented by the next line table entry past our start position. |
| 793 | On platforms that generate one line table entry per line, this |
| 794 | is not a problem. However, on the ia64, the compiler generates |
| 795 | extraneous line table entries that do not increase the line number. |
| 796 | When we issue the gdb next command on the ia64 after an inferior call |
| 797 | or a return command, we often end up a few instructions forward, still |
| 798 | within the original line we started. |
| 799 | |
| 800 | An attempt was made to have init_execution_control_state () refresh |
| 801 | the prev_pc value before calculating the line number. This approach |
| 802 | did not work because on platforms that use ptrace, the pc register |
| 803 | cannot be read unless the inferior is stopped. At that point, we |
| 804 | are not guaranteed the inferior is stopped and so the read_pc () |
| 805 | call can fail. Setting the prev_pc value here ensures the value is |
| 806 | updated correctly when the inferior is stopped. */ |
| 807 | prev_pc = read_pc (); |
| 808 | |
| 809 | /* Resume inferior. */ |
| 810 | resume (oneproc || step || bpstat_should_step (), stop_signal); |
| 811 | |
| 812 | /* Wait for it to stop (if not standalone) |
| 813 | and in any case decode why it stopped, and act accordingly. */ |
| 814 | /* Do this only if we are not using the event loop, or if the target |
| 815 | does not support asynchronous execution. */ |
| 816 | if (!target_can_async_p ()) |
| 817 | { |
| 818 | wait_for_inferior (); |
| 819 | normal_stop (); |
| 820 | } |
| 821 | } |
| 822 | \f |
| 823 | |
| 824 | /* Start remote-debugging of a machine over a serial link. */ |
| 825 | |
| 826 | void |
| 827 | start_remote (int from_tty) |
| 828 | { |
| 829 | init_thread_list (); |
| 830 | init_wait_for_inferior (); |
| 831 | stop_soon = STOP_QUIETLY; |
| 832 | trap_expected = 0; |
| 833 | |
| 834 | /* Always go on waiting for the target, regardless of the mode. */ |
| 835 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
| 836 | indicate to wait_for_inferior that a target should timeout if |
| 837 | nothing is returned (instead of just blocking). Because of this, |
| 838 | targets expecting an immediate response need to, internally, set |
| 839 | things up so that the target_wait() is forced to eventually |
| 840 | timeout. */ |
| 841 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
| 842 | differentiate to its caller what the state of the target is after |
| 843 | the initial open has been performed. Here we're assuming that |
| 844 | the target has stopped. It should be possible to eventually have |
| 845 | target_open() return to the caller an indication that the target |
| 846 | is currently running and GDB state should be set to the same as |
| 847 | for an async run. */ |
| 848 | wait_for_inferior (); |
| 849 | |
| 850 | /* Now that the inferior has stopped, do any bookkeeping like |
| 851 | loading shared libraries. We want to do this before normal_stop, |
| 852 | so that the displayed frame is up to date. */ |
| 853 | post_create_inferior (¤t_target, from_tty); |
| 854 | |
| 855 | normal_stop (); |
| 856 | } |
| 857 | |
| 858 | /* Initialize static vars when a new inferior begins. */ |
| 859 | |
| 860 | void |
| 861 | init_wait_for_inferior (void) |
| 862 | { |
| 863 | /* These are meaningless until the first time through wait_for_inferior. */ |
| 864 | prev_pc = 0; |
| 865 | |
| 866 | breakpoints_inserted = 0; |
| 867 | breakpoint_init_inferior (inf_starting); |
| 868 | |
| 869 | /* Don't confuse first call to proceed(). */ |
| 870 | stop_signal = TARGET_SIGNAL_0; |
| 871 | |
| 872 | /* The first resume is not following a fork/vfork/exec. */ |
| 873 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ |
| 874 | |
| 875 | clear_proceed_status (); |
| 876 | |
| 877 | stepping_past_singlestep_breakpoint = 0; |
| 878 | } |
| 879 | \f |
| 880 | /* This enum encodes possible reasons for doing a target_wait, so that |
| 881 | wfi can call target_wait in one place. (Ultimately the call will be |
| 882 | moved out of the infinite loop entirely.) */ |
| 883 | |
| 884 | enum infwait_states |
| 885 | { |
| 886 | infwait_normal_state, |
| 887 | infwait_thread_hop_state, |
| 888 | infwait_nonstep_watch_state |
| 889 | }; |
| 890 | |
| 891 | /* Why did the inferior stop? Used to print the appropriate messages |
| 892 | to the interface from within handle_inferior_event(). */ |
| 893 | enum inferior_stop_reason |
| 894 | { |
| 895 | /* Step, next, nexti, stepi finished. */ |
| 896 | END_STEPPING_RANGE, |
| 897 | /* Inferior terminated by signal. */ |
| 898 | SIGNAL_EXITED, |
| 899 | /* Inferior exited. */ |
| 900 | EXITED, |
| 901 | /* Inferior received signal, and user asked to be notified. */ |
| 902 | SIGNAL_RECEIVED |
| 903 | }; |
| 904 | |
| 905 | /* This structure contains what used to be local variables in |
| 906 | wait_for_inferior. Probably many of them can return to being |
| 907 | locals in handle_inferior_event. */ |
| 908 | |
| 909 | struct execution_control_state |
| 910 | { |
| 911 | struct target_waitstatus ws; |
| 912 | struct target_waitstatus *wp; |
| 913 | int another_trap; |
| 914 | int random_signal; |
| 915 | CORE_ADDR stop_func_start; |
| 916 | CORE_ADDR stop_func_end; |
| 917 | char *stop_func_name; |
| 918 | struct symtab_and_line sal; |
| 919 | int current_line; |
| 920 | struct symtab *current_symtab; |
| 921 | int handling_longjmp; /* FIXME */ |
| 922 | ptid_t ptid; |
| 923 | ptid_t saved_inferior_ptid; |
| 924 | int step_after_step_resume_breakpoint; |
| 925 | int stepping_through_solib_after_catch; |
| 926 | bpstat stepping_through_solib_catchpoints; |
| 927 | int new_thread_event; |
| 928 | struct target_waitstatus tmpstatus; |
| 929 | enum infwait_states infwait_state; |
| 930 | ptid_t waiton_ptid; |
| 931 | int wait_some_more; |
| 932 | }; |
| 933 | |
| 934 | void init_execution_control_state (struct execution_control_state *ecs); |
| 935 | |
| 936 | void handle_inferior_event (struct execution_control_state *ecs); |
| 937 | |
| 938 | static void step_into_function (struct execution_control_state *ecs); |
| 939 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
| 940 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
| 941 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
| 942 | struct frame_id sr_id); |
| 943 | static void stop_stepping (struct execution_control_state *ecs); |
| 944 | static void prepare_to_wait (struct execution_control_state *ecs); |
| 945 | static void keep_going (struct execution_control_state *ecs); |
| 946 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
| 947 | int stop_info); |
| 948 | |
| 949 | /* Wait for control to return from inferior to debugger. |
| 950 | If inferior gets a signal, we may decide to start it up again |
| 951 | instead of returning. That is why there is a loop in this function. |
| 952 | When this function actually returns it means the inferior |
| 953 | should be left stopped and GDB should read more commands. */ |
| 954 | |
| 955 | void |
| 956 | wait_for_inferior (void) |
| 957 | { |
| 958 | struct cleanup *old_cleanups; |
| 959 | struct execution_control_state ecss; |
| 960 | struct execution_control_state *ecs; |
| 961 | |
| 962 | if (debug_infrun) |
| 963 | fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n"); |
| 964 | |
| 965 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
| 966 | &step_resume_breakpoint); |
| 967 | |
| 968 | /* wfi still stays in a loop, so it's OK just to take the address of |
| 969 | a local to get the ecs pointer. */ |
| 970 | ecs = &ecss; |
| 971 | |
| 972 | /* Fill in with reasonable starting values. */ |
| 973 | init_execution_control_state (ecs); |
| 974 | |
| 975 | /* We'll update this if & when we switch to a new thread. */ |
| 976 | previous_inferior_ptid = inferior_ptid; |
| 977 | |
| 978 | overlay_cache_invalid = 1; |
| 979 | |
| 980 | /* We have to invalidate the registers BEFORE calling target_wait |
| 981 | because they can be loaded from the target while in target_wait. |
| 982 | This makes remote debugging a bit more efficient for those |
| 983 | targets that provide critical registers as part of their normal |
| 984 | status mechanism. */ |
| 985 | |
| 986 | registers_changed (); |
| 987 | |
| 988 | while (1) |
| 989 | { |
| 990 | if (deprecated_target_wait_hook) |
| 991 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); |
| 992 | else |
| 993 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
| 994 | |
| 995 | /* Now figure out what to do with the result of the result. */ |
| 996 | handle_inferior_event (ecs); |
| 997 | |
| 998 | if (!ecs->wait_some_more) |
| 999 | break; |
| 1000 | } |
| 1001 | do_cleanups (old_cleanups); |
| 1002 | } |
| 1003 | |
| 1004 | /* Asynchronous version of wait_for_inferior. It is called by the |
| 1005 | event loop whenever a change of state is detected on the file |
| 1006 | descriptor corresponding to the target. It can be called more than |
| 1007 | once to complete a single execution command. In such cases we need |
| 1008 | to keep the state in a global variable ASYNC_ECSS. If it is the |
| 1009 | last time that this function is called for a single execution |
| 1010 | command, then report to the user that the inferior has stopped, and |
| 1011 | do the necessary cleanups. */ |
| 1012 | |
| 1013 | struct execution_control_state async_ecss; |
| 1014 | struct execution_control_state *async_ecs; |
| 1015 | |
| 1016 | void |
| 1017 | fetch_inferior_event (void *client_data) |
| 1018 | { |
| 1019 | static struct cleanup *old_cleanups; |
| 1020 | |
| 1021 | async_ecs = &async_ecss; |
| 1022 | |
| 1023 | if (!async_ecs->wait_some_more) |
| 1024 | { |
| 1025 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
| 1026 | &step_resume_breakpoint); |
| 1027 | |
| 1028 | /* Fill in with reasonable starting values. */ |
| 1029 | init_execution_control_state (async_ecs); |
| 1030 | |
| 1031 | /* We'll update this if & when we switch to a new thread. */ |
| 1032 | previous_inferior_ptid = inferior_ptid; |
| 1033 | |
| 1034 | overlay_cache_invalid = 1; |
| 1035 | |
| 1036 | /* We have to invalidate the registers BEFORE calling target_wait |
| 1037 | because they can be loaded from the target while in target_wait. |
| 1038 | This makes remote debugging a bit more efficient for those |
| 1039 | targets that provide critical registers as part of their normal |
| 1040 | status mechanism. */ |
| 1041 | |
| 1042 | registers_changed (); |
| 1043 | } |
| 1044 | |
| 1045 | if (deprecated_target_wait_hook) |
| 1046 | async_ecs->ptid = |
| 1047 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
| 1048 | else |
| 1049 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
| 1050 | |
| 1051 | /* Now figure out what to do with the result of the result. */ |
| 1052 | handle_inferior_event (async_ecs); |
| 1053 | |
| 1054 | if (!async_ecs->wait_some_more) |
| 1055 | { |
| 1056 | /* Do only the cleanups that have been added by this |
| 1057 | function. Let the continuations for the commands do the rest, |
| 1058 | if there are any. */ |
| 1059 | do_exec_cleanups (old_cleanups); |
| 1060 | normal_stop (); |
| 1061 | if (step_multi && stop_step) |
| 1062 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
| 1063 | else |
| 1064 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); |
| 1065 | } |
| 1066 | } |
| 1067 | |
| 1068 | /* Prepare an execution control state for looping through a |
| 1069 | wait_for_inferior-type loop. */ |
| 1070 | |
| 1071 | void |
| 1072 | init_execution_control_state (struct execution_control_state *ecs) |
| 1073 | { |
| 1074 | ecs->another_trap = 0; |
| 1075 | ecs->random_signal = 0; |
| 1076 | ecs->step_after_step_resume_breakpoint = 0; |
| 1077 | ecs->handling_longjmp = 0; /* FIXME */ |
| 1078 | ecs->stepping_through_solib_after_catch = 0; |
| 1079 | ecs->stepping_through_solib_catchpoints = NULL; |
| 1080 | ecs->sal = find_pc_line (prev_pc, 0); |
| 1081 | ecs->current_line = ecs->sal.line; |
| 1082 | ecs->current_symtab = ecs->sal.symtab; |
| 1083 | ecs->infwait_state = infwait_normal_state; |
| 1084 | ecs->waiton_ptid = pid_to_ptid (-1); |
| 1085 | ecs->wp = &(ecs->ws); |
| 1086 | } |
| 1087 | |
| 1088 | /* Return the cached copy of the last pid/waitstatus returned by |
| 1089 | target_wait()/deprecated_target_wait_hook(). The data is actually |
| 1090 | cached by handle_inferior_event(), which gets called immediately |
| 1091 | after target_wait()/deprecated_target_wait_hook(). */ |
| 1092 | |
| 1093 | void |
| 1094 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
| 1095 | { |
| 1096 | *ptidp = target_last_wait_ptid; |
| 1097 | *status = target_last_waitstatus; |
| 1098 | } |
| 1099 | |
| 1100 | void |
| 1101 | nullify_last_target_wait_ptid (void) |
| 1102 | { |
| 1103 | target_last_wait_ptid = minus_one_ptid; |
| 1104 | } |
| 1105 | |
| 1106 | /* Switch thread contexts, maintaining "infrun state". */ |
| 1107 | |
| 1108 | static void |
| 1109 | context_switch (struct execution_control_state *ecs) |
| 1110 | { |
| 1111 | /* Caution: it may happen that the new thread (or the old one!) |
| 1112 | is not in the thread list. In this case we must not attempt |
| 1113 | to "switch context", or we run the risk that our context may |
| 1114 | be lost. This may happen as a result of the target module |
| 1115 | mishandling thread creation. */ |
| 1116 | |
| 1117 | if (debug_infrun) |
| 1118 | { |
| 1119 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", |
| 1120 | target_pid_to_str (inferior_ptid)); |
| 1121 | fprintf_unfiltered (gdb_stdlog, "to %s\n", |
| 1122 | target_pid_to_str (ecs->ptid)); |
| 1123 | } |
| 1124 | |
| 1125 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) |
| 1126 | { /* Perform infrun state context switch: */ |
| 1127 | /* Save infrun state for the old thread. */ |
| 1128 | save_infrun_state (inferior_ptid, prev_pc, |
| 1129 | trap_expected, step_resume_breakpoint, |
| 1130 | step_range_start, |
| 1131 | step_range_end, &step_frame_id, |
| 1132 | ecs->handling_longjmp, ecs->another_trap, |
| 1133 | ecs->stepping_through_solib_after_catch, |
| 1134 | ecs->stepping_through_solib_catchpoints, |
| 1135 | ecs->current_line, ecs->current_symtab); |
| 1136 | |
| 1137 | /* Load infrun state for the new thread. */ |
| 1138 | load_infrun_state (ecs->ptid, &prev_pc, |
| 1139 | &trap_expected, &step_resume_breakpoint, |
| 1140 | &step_range_start, |
| 1141 | &step_range_end, &step_frame_id, |
| 1142 | &ecs->handling_longjmp, &ecs->another_trap, |
| 1143 | &ecs->stepping_through_solib_after_catch, |
| 1144 | &ecs->stepping_through_solib_catchpoints, |
| 1145 | &ecs->current_line, &ecs->current_symtab); |
| 1146 | } |
| 1147 | inferior_ptid = ecs->ptid; |
| 1148 | reinit_frame_cache (); |
| 1149 | } |
| 1150 | |
| 1151 | static void |
| 1152 | adjust_pc_after_break (struct execution_control_state *ecs) |
| 1153 | { |
| 1154 | CORE_ADDR breakpoint_pc; |
| 1155 | |
| 1156 | /* If this target does not decrement the PC after breakpoints, then |
| 1157 | we have nothing to do. */ |
| 1158 | if (gdbarch_decr_pc_after_break (current_gdbarch) == 0) |
| 1159 | return; |
| 1160 | |
| 1161 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
| 1162 | we aren't, just return. |
| 1163 | |
| 1164 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not |
| 1165 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
| 1166 | implemented by software breakpoints should be handled through the normal |
| 1167 | breakpoint layer. |
| 1168 | |
| 1169 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
| 1170 | different signals (SIGILL or SIGEMT for instance), but it is less |
| 1171 | clear where the PC is pointing afterwards. It may not match |
| 1172 | gdbarch_decr_pc_after_break. I don't know any specific target that |
| 1173 | generates these signals at breakpoints (the code has been in GDB since at |
| 1174 | least 1992) so I can not guess how to handle them here. |
| 1175 | |
| 1176 | In earlier versions of GDB, a target with |
| 1177 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a |
| 1178 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
| 1179 | target with both of these set in GDB history, and it seems unlikely to be |
| 1180 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ |
| 1181 | |
| 1182 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) |
| 1183 | return; |
| 1184 | |
| 1185 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) |
| 1186 | return; |
| 1187 | |
| 1188 | /* Find the location where (if we've hit a breakpoint) the |
| 1189 | breakpoint would be. */ |
| 1190 | breakpoint_pc = read_pc_pid (ecs->ptid) - gdbarch_decr_pc_after_break |
| 1191 | (current_gdbarch); |
| 1192 | |
| 1193 | /* Check whether there actually is a software breakpoint inserted |
| 1194 | at that location. */ |
| 1195 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) |
| 1196 | { |
| 1197 | /* When using hardware single-step, a SIGTRAP is reported for both |
| 1198 | a completed single-step and a software breakpoint. Need to |
| 1199 | differentiate between the two, as the latter needs adjusting |
| 1200 | but the former does not. |
| 1201 | |
| 1202 | The SIGTRAP can be due to a completed hardware single-step only if |
| 1203 | - we didn't insert software single-step breakpoints |
| 1204 | - the thread to be examined is still the current thread |
| 1205 | - this thread is currently being stepped |
| 1206 | |
| 1207 | If any of these events did not occur, we must have stopped due |
| 1208 | to hitting a software breakpoint, and have to back up to the |
| 1209 | breakpoint address. |
| 1210 | |
| 1211 | As a special case, we could have hardware single-stepped a |
| 1212 | software breakpoint. In this case (prev_pc == breakpoint_pc), |
| 1213 | we also need to back up to the breakpoint address. */ |
| 1214 | |
| 1215 | if (singlestep_breakpoints_inserted_p |
| 1216 | || !ptid_equal (ecs->ptid, inferior_ptid) |
| 1217 | || !currently_stepping (ecs) |
| 1218 | || prev_pc == breakpoint_pc) |
| 1219 | write_pc_pid (breakpoint_pc, ecs->ptid); |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | /* Given an execution control state that has been freshly filled in |
| 1224 | by an event from the inferior, figure out what it means and take |
| 1225 | appropriate action. */ |
| 1226 | |
| 1227 | int stepped_after_stopped_by_watchpoint; |
| 1228 | |
| 1229 | void |
| 1230 | handle_inferior_event (struct execution_control_state *ecs) |
| 1231 | { |
| 1232 | /* NOTE: bje/2005-05-02: If you're looking at this code and thinking |
| 1233 | that the variable stepped_after_stopped_by_watchpoint isn't used, |
| 1234 | then you're wrong! See remote.c:remote_stopped_data_address. */ |
| 1235 | |
| 1236 | int sw_single_step_trap_p = 0; |
| 1237 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
| 1238 | |
| 1239 | /* Cache the last pid/waitstatus. */ |
| 1240 | target_last_wait_ptid = ecs->ptid; |
| 1241 | target_last_waitstatus = *ecs->wp; |
| 1242 | |
| 1243 | adjust_pc_after_break (ecs); |
| 1244 | |
| 1245 | switch (ecs->infwait_state) |
| 1246 | { |
| 1247 | case infwait_thread_hop_state: |
| 1248 | if (debug_infrun) |
| 1249 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
| 1250 | /* Cancel the waiton_ptid. */ |
| 1251 | ecs->waiton_ptid = pid_to_ptid (-1); |
| 1252 | break; |
| 1253 | |
| 1254 | case infwait_normal_state: |
| 1255 | if (debug_infrun) |
| 1256 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
| 1257 | stepped_after_stopped_by_watchpoint = 0; |
| 1258 | break; |
| 1259 | |
| 1260 | case infwait_nonstep_watch_state: |
| 1261 | if (debug_infrun) |
| 1262 | fprintf_unfiltered (gdb_stdlog, |
| 1263 | "infrun: infwait_nonstep_watch_state\n"); |
| 1264 | insert_breakpoints (); |
| 1265 | |
| 1266 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
| 1267 | handle things like signals arriving and other things happening |
| 1268 | in combination correctly? */ |
| 1269 | stepped_after_stopped_by_watchpoint = 1; |
| 1270 | break; |
| 1271 | |
| 1272 | default: |
| 1273 | internal_error (__FILE__, __LINE__, _("bad switch")); |
| 1274 | } |
| 1275 | ecs->infwait_state = infwait_normal_state; |
| 1276 | |
| 1277 | reinit_frame_cache (); |
| 1278 | |
| 1279 | /* If it's a new process, add it to the thread database */ |
| 1280 | |
| 1281 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
| 1282 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
| 1283 | && !in_thread_list (ecs->ptid)); |
| 1284 | |
| 1285 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
| 1286 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) |
| 1287 | { |
| 1288 | add_thread (ecs->ptid); |
| 1289 | |
| 1290 | ui_out_text (uiout, "[New "); |
| 1291 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); |
| 1292 | ui_out_text (uiout, "]\n"); |
| 1293 | } |
| 1294 | |
| 1295 | switch (ecs->ws.kind) |
| 1296 | { |
| 1297 | case TARGET_WAITKIND_LOADED: |
| 1298 | if (debug_infrun) |
| 1299 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
| 1300 | /* Ignore gracefully during startup of the inferior, as it |
| 1301 | might be the shell which has just loaded some objects, |
| 1302 | otherwise add the symbols for the newly loaded objects. */ |
| 1303 | #ifdef SOLIB_ADD |
| 1304 | if (stop_soon == NO_STOP_QUIETLY) |
| 1305 | { |
| 1306 | /* Remove breakpoints, SOLIB_ADD might adjust |
| 1307 | breakpoint addresses via breakpoint_re_set. */ |
| 1308 | if (breakpoints_inserted) |
| 1309 | remove_breakpoints (); |
| 1310 | |
| 1311 | /* Check for any newly added shared libraries if we're |
| 1312 | supposed to be adding them automatically. Switch |
| 1313 | terminal for any messages produced by |
| 1314 | breakpoint_re_set. */ |
| 1315 | target_terminal_ours_for_output (); |
| 1316 | /* NOTE: cagney/2003-11-25: Make certain that the target |
| 1317 | stack's section table is kept up-to-date. Architectures, |
| 1318 | (e.g., PPC64), use the section table to perform |
| 1319 | operations such as address => section name and hence |
| 1320 | require the table to contain all sections (including |
| 1321 | those found in shared libraries). */ |
| 1322 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
| 1323 | exec_ops to SOLIB_ADD. This is because current GDB is |
| 1324 | only tooled to propagate section_table changes out from |
| 1325 | the "current_target" (see target_resize_to_sections), and |
| 1326 | not up from the exec stratum. This, of course, isn't |
| 1327 | right. "infrun.c" should only interact with the |
| 1328 | exec/process stratum, instead relying on the target stack |
| 1329 | to propagate relevant changes (stop, section table |
| 1330 | changed, ...) up to other layers. */ |
| 1331 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
| 1332 | target_terminal_inferior (); |
| 1333 | |
| 1334 | /* Reinsert breakpoints and continue. */ |
| 1335 | if (breakpoints_inserted) |
| 1336 | insert_breakpoints (); |
| 1337 | } |
| 1338 | #endif |
| 1339 | resume (0, TARGET_SIGNAL_0); |
| 1340 | prepare_to_wait (ecs); |
| 1341 | return; |
| 1342 | |
| 1343 | case TARGET_WAITKIND_SPURIOUS: |
| 1344 | if (debug_infrun) |
| 1345 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
| 1346 | resume (0, TARGET_SIGNAL_0); |
| 1347 | prepare_to_wait (ecs); |
| 1348 | return; |
| 1349 | |
| 1350 | case TARGET_WAITKIND_EXITED: |
| 1351 | if (debug_infrun) |
| 1352 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
| 1353 | target_terminal_ours (); /* Must do this before mourn anyway */ |
| 1354 | print_stop_reason (EXITED, ecs->ws.value.integer); |
| 1355 | |
| 1356 | /* Record the exit code in the convenience variable $_exitcode, so |
| 1357 | that the user can inspect this again later. */ |
| 1358 | set_internalvar (lookup_internalvar ("_exitcode"), |
| 1359 | value_from_longest (builtin_type_int, |
| 1360 | (LONGEST) ecs->ws.value.integer)); |
| 1361 | gdb_flush (gdb_stdout); |
| 1362 | target_mourn_inferior (); |
| 1363 | singlestep_breakpoints_inserted_p = 0; |
| 1364 | stop_print_frame = 0; |
| 1365 | stop_stepping (ecs); |
| 1366 | return; |
| 1367 | |
| 1368 | case TARGET_WAITKIND_SIGNALLED: |
| 1369 | if (debug_infrun) |
| 1370 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
| 1371 | stop_print_frame = 0; |
| 1372 | stop_signal = ecs->ws.value.sig; |
| 1373 | target_terminal_ours (); /* Must do this before mourn anyway */ |
| 1374 | |
| 1375 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
| 1376 | reach here unless the inferior is dead. However, for years |
| 1377 | target_kill() was called here, which hints that fatal signals aren't |
| 1378 | really fatal on some systems. If that's true, then some changes |
| 1379 | may be needed. */ |
| 1380 | target_mourn_inferior (); |
| 1381 | |
| 1382 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
| 1383 | singlestep_breakpoints_inserted_p = 0; |
| 1384 | stop_stepping (ecs); |
| 1385 | return; |
| 1386 | |
| 1387 | /* The following are the only cases in which we keep going; |
| 1388 | the above cases end in a continue or goto. */ |
| 1389 | case TARGET_WAITKIND_FORKED: |
| 1390 | case TARGET_WAITKIND_VFORKED: |
| 1391 | if (debug_infrun) |
| 1392 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
| 1393 | stop_signal = TARGET_SIGNAL_TRAP; |
| 1394 | pending_follow.kind = ecs->ws.kind; |
| 1395 | |
| 1396 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
| 1397 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; |
| 1398 | |
| 1399 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
| 1400 | { |
| 1401 | context_switch (ecs); |
| 1402 | reinit_frame_cache (); |
| 1403 | } |
| 1404 | |
| 1405 | stop_pc = read_pc (); |
| 1406 | |
| 1407 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
| 1408 | |
| 1409 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
| 1410 | |
| 1411 | /* If no catchpoint triggered for this, then keep going. */ |
| 1412 | if (ecs->random_signal) |
| 1413 | { |
| 1414 | stop_signal = TARGET_SIGNAL_0; |
| 1415 | keep_going (ecs); |
| 1416 | return; |
| 1417 | } |
| 1418 | goto process_event_stop_test; |
| 1419 | |
| 1420 | case TARGET_WAITKIND_EXECD: |
| 1421 | if (debug_infrun) |
| 1422 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
| 1423 | stop_signal = TARGET_SIGNAL_TRAP; |
| 1424 | |
| 1425 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
| 1426 | target_wait function. Until then following vfork on HP/UX 10.20 |
| 1427 | is probably broken by this. Of course, it's broken anyway. */ |
| 1428 | /* Is this a target which reports multiple exec events per actual |
| 1429 | call to exec()? (HP-UX using ptrace does, for example.) If so, |
| 1430 | ignore all but the last one. Just resume the exec'r, and wait |
| 1431 | for the next exec event. */ |
| 1432 | if (inferior_ignoring_leading_exec_events) |
| 1433 | { |
| 1434 | inferior_ignoring_leading_exec_events--; |
| 1435 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); |
| 1436 | prepare_to_wait (ecs); |
| 1437 | return; |
| 1438 | } |
| 1439 | inferior_ignoring_leading_exec_events = |
| 1440 | target_reported_exec_events_per_exec_call () - 1; |
| 1441 | |
| 1442 | pending_follow.execd_pathname = |
| 1443 | savestring (ecs->ws.value.execd_pathname, |
| 1444 | strlen (ecs->ws.value.execd_pathname)); |
| 1445 | |
| 1446 | /* This causes the eventpoints and symbol table to be reset. Must |
| 1447 | do this now, before trying to determine whether to stop. */ |
| 1448 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); |
| 1449 | xfree (pending_follow.execd_pathname); |
| 1450 | |
| 1451 | stop_pc = read_pc_pid (ecs->ptid); |
| 1452 | ecs->saved_inferior_ptid = inferior_ptid; |
| 1453 | inferior_ptid = ecs->ptid; |
| 1454 | |
| 1455 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
| 1456 | |
| 1457 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
| 1458 | inferior_ptid = ecs->saved_inferior_ptid; |
| 1459 | |
| 1460 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
| 1461 | { |
| 1462 | context_switch (ecs); |
| 1463 | reinit_frame_cache (); |
| 1464 | } |
| 1465 | |
| 1466 | /* If no catchpoint triggered for this, then keep going. */ |
| 1467 | if (ecs->random_signal) |
| 1468 | { |
| 1469 | stop_signal = TARGET_SIGNAL_0; |
| 1470 | keep_going (ecs); |
| 1471 | return; |
| 1472 | } |
| 1473 | goto process_event_stop_test; |
| 1474 | |
| 1475 | /* Be careful not to try to gather much state about a thread |
| 1476 | that's in a syscall. It's frequently a losing proposition. */ |
| 1477 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
| 1478 | if (debug_infrun) |
| 1479 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
| 1480 | resume (0, TARGET_SIGNAL_0); |
| 1481 | prepare_to_wait (ecs); |
| 1482 | return; |
| 1483 | |
| 1484 | /* Before examining the threads further, step this thread to |
| 1485 | get it entirely out of the syscall. (We get notice of the |
| 1486 | event when the thread is just on the verge of exiting a |
| 1487 | syscall. Stepping one instruction seems to get it back |
| 1488 | into user code.) */ |
| 1489 | case TARGET_WAITKIND_SYSCALL_RETURN: |
| 1490 | if (debug_infrun) |
| 1491 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
| 1492 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
| 1493 | prepare_to_wait (ecs); |
| 1494 | return; |
| 1495 | |
| 1496 | case TARGET_WAITKIND_STOPPED: |
| 1497 | if (debug_infrun) |
| 1498 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
| 1499 | stop_signal = ecs->ws.value.sig; |
| 1500 | break; |
| 1501 | |
| 1502 | /* We had an event in the inferior, but we are not interested |
| 1503 | in handling it at this level. The lower layers have already |
| 1504 | done what needs to be done, if anything. |
| 1505 | |
| 1506 | One of the possible circumstances for this is when the |
| 1507 | inferior produces output for the console. The inferior has |
| 1508 | not stopped, and we are ignoring the event. Another possible |
| 1509 | circumstance is any event which the lower level knows will be |
| 1510 | reported multiple times without an intervening resume. */ |
| 1511 | case TARGET_WAITKIND_IGNORE: |
| 1512 | if (debug_infrun) |
| 1513 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
| 1514 | prepare_to_wait (ecs); |
| 1515 | return; |
| 1516 | } |
| 1517 | |
| 1518 | /* We may want to consider not doing a resume here in order to give |
| 1519 | the user a chance to play with the new thread. It might be good |
| 1520 | to make that a user-settable option. */ |
| 1521 | |
| 1522 | /* At this point, all threads are stopped (happens automatically in |
| 1523 | either the OS or the native code). Therefore we need to continue |
| 1524 | all threads in order to make progress. */ |
| 1525 | if (ecs->new_thread_event) |
| 1526 | { |
| 1527 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
| 1528 | prepare_to_wait (ecs); |
| 1529 | return; |
| 1530 | } |
| 1531 | |
| 1532 | stop_pc = read_pc_pid (ecs->ptid); |
| 1533 | |
| 1534 | if (debug_infrun) |
| 1535 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); |
| 1536 | |
| 1537 | if (stepping_past_singlestep_breakpoint) |
| 1538 | { |
| 1539 | gdb_assert (singlestep_breakpoints_inserted_p); |
| 1540 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
| 1541 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); |
| 1542 | |
| 1543 | stepping_past_singlestep_breakpoint = 0; |
| 1544 | |
| 1545 | /* We've either finished single-stepping past the single-step |
| 1546 | breakpoint, or stopped for some other reason. It would be nice if |
| 1547 | we could tell, but we can't reliably. */ |
| 1548 | if (stop_signal == TARGET_SIGNAL_TRAP) |
| 1549 | { |
| 1550 | if (debug_infrun) |
| 1551 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
| 1552 | /* Pull the single step breakpoints out of the target. */ |
| 1553 | remove_single_step_breakpoints (); |
| 1554 | singlestep_breakpoints_inserted_p = 0; |
| 1555 | |
| 1556 | ecs->random_signal = 0; |
| 1557 | |
| 1558 | ecs->ptid = saved_singlestep_ptid; |
| 1559 | context_switch (ecs); |
| 1560 | if (deprecated_context_hook) |
| 1561 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); |
| 1562 | |
| 1563 | resume (1, TARGET_SIGNAL_0); |
| 1564 | prepare_to_wait (ecs); |
| 1565 | return; |
| 1566 | } |
| 1567 | } |
| 1568 | |
| 1569 | stepping_past_singlestep_breakpoint = 0; |
| 1570 | |
| 1571 | /* See if a thread hit a thread-specific breakpoint that was meant for |
| 1572 | another thread. If so, then step that thread past the breakpoint, |
| 1573 | and continue it. */ |
| 1574 | |
| 1575 | if (stop_signal == TARGET_SIGNAL_TRAP) |
| 1576 | { |
| 1577 | int thread_hop_needed = 0; |
| 1578 | |
| 1579 | /* Check if a regular breakpoint has been hit before checking |
| 1580 | for a potential single step breakpoint. Otherwise, GDB will |
| 1581 | not see this breakpoint hit when stepping onto breakpoints. */ |
| 1582 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
| 1583 | { |
| 1584 | ecs->random_signal = 0; |
| 1585 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
| 1586 | thread_hop_needed = 1; |
| 1587 | } |
| 1588 | else if (singlestep_breakpoints_inserted_p) |
| 1589 | { |
| 1590 | /* We have not context switched yet, so this should be true |
| 1591 | no matter which thread hit the singlestep breakpoint. */ |
| 1592 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); |
| 1593 | if (debug_infrun) |
| 1594 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " |
| 1595 | "trap for %s\n", |
| 1596 | target_pid_to_str (ecs->ptid)); |
| 1597 | |
| 1598 | ecs->random_signal = 0; |
| 1599 | /* The call to in_thread_list is necessary because PTIDs sometimes |
| 1600 | change when we go from single-threaded to multi-threaded. If |
| 1601 | the singlestep_ptid is still in the list, assume that it is |
| 1602 | really different from ecs->ptid. */ |
| 1603 | if (!ptid_equal (singlestep_ptid, ecs->ptid) |
| 1604 | && in_thread_list (singlestep_ptid)) |
| 1605 | { |
| 1606 | /* If the PC of the thread we were trying to single-step |
| 1607 | has changed, discard this event (which we were going |
| 1608 | to ignore anyway), and pretend we saw that thread |
| 1609 | trap. This prevents us continuously moving the |
| 1610 | single-step breakpoint forward, one instruction at a |
| 1611 | time. If the PC has changed, then the thread we were |
| 1612 | trying to single-step has trapped or been signalled, |
| 1613 | but the event has not been reported to GDB yet. |
| 1614 | |
| 1615 | There might be some cases where this loses signal |
| 1616 | information, if a signal has arrived at exactly the |
| 1617 | same time that the PC changed, but this is the best |
| 1618 | we can do with the information available. Perhaps we |
| 1619 | should arrange to report all events for all threads |
| 1620 | when they stop, or to re-poll the remote looking for |
| 1621 | this particular thread (i.e. temporarily enable |
| 1622 | schedlock). */ |
| 1623 | if (read_pc_pid (singlestep_ptid) != singlestep_pc) |
| 1624 | { |
| 1625 | if (debug_infrun) |
| 1626 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," |
| 1627 | " but expected thread advanced also\n"); |
| 1628 | |
| 1629 | /* The current context still belongs to |
| 1630 | singlestep_ptid. Don't swap here, since that's |
| 1631 | the context we want to use. Just fudge our |
| 1632 | state and continue. */ |
| 1633 | ecs->ptid = singlestep_ptid; |
| 1634 | stop_pc = read_pc_pid (ecs->ptid); |
| 1635 | } |
| 1636 | else |
| 1637 | { |
| 1638 | if (debug_infrun) |
| 1639 | fprintf_unfiltered (gdb_stdlog, |
| 1640 | "infrun: unexpected thread\n"); |
| 1641 | |
| 1642 | thread_hop_needed = 1; |
| 1643 | stepping_past_singlestep_breakpoint = 1; |
| 1644 | saved_singlestep_ptid = singlestep_ptid; |
| 1645 | } |
| 1646 | } |
| 1647 | } |
| 1648 | |
| 1649 | if (thread_hop_needed) |
| 1650 | { |
| 1651 | int remove_status; |
| 1652 | |
| 1653 | if (debug_infrun) |
| 1654 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
| 1655 | |
| 1656 | /* Saw a breakpoint, but it was hit by the wrong thread. |
| 1657 | Just continue. */ |
| 1658 | |
| 1659 | if (singlestep_breakpoints_inserted_p) |
| 1660 | { |
| 1661 | /* Pull the single step breakpoints out of the target. */ |
| 1662 | remove_single_step_breakpoints (); |
| 1663 | singlestep_breakpoints_inserted_p = 0; |
| 1664 | } |
| 1665 | |
| 1666 | remove_status = remove_breakpoints (); |
| 1667 | /* Did we fail to remove breakpoints? If so, try |
| 1668 | to set the PC past the bp. (There's at least |
| 1669 | one situation in which we can fail to remove |
| 1670 | the bp's: On HP-UX's that use ttrace, we can't |
| 1671 | change the address space of a vforking child |
| 1672 | process until the child exits (well, okay, not |
| 1673 | then either :-) or execs. */ |
| 1674 | if (remove_status != 0) |
| 1675 | { |
| 1676 | /* FIXME! This is obviously non-portable! */ |
| 1677 | write_pc_pid (stop_pc + 4, ecs->ptid); |
| 1678 | /* We need to restart all the threads now, |
| 1679 | * unles we're running in scheduler-locked mode. |
| 1680 | * Use currently_stepping to determine whether to |
| 1681 | * step or continue. |
| 1682 | */ |
| 1683 | /* FIXME MVS: is there any reason not to call resume()? */ |
| 1684 | if (scheduler_mode == schedlock_on) |
| 1685 | target_resume (ecs->ptid, |
| 1686 | currently_stepping (ecs), TARGET_SIGNAL_0); |
| 1687 | else |
| 1688 | target_resume (RESUME_ALL, |
| 1689 | currently_stepping (ecs), TARGET_SIGNAL_0); |
| 1690 | prepare_to_wait (ecs); |
| 1691 | return; |
| 1692 | } |
| 1693 | else |
| 1694 | { /* Single step */ |
| 1695 | breakpoints_inserted = 0; |
| 1696 | if (!ptid_equal (inferior_ptid, ecs->ptid)) |
| 1697 | context_switch (ecs); |
| 1698 | ecs->waiton_ptid = ecs->ptid; |
| 1699 | ecs->wp = &(ecs->ws); |
| 1700 | ecs->another_trap = 1; |
| 1701 | |
| 1702 | ecs->infwait_state = infwait_thread_hop_state; |
| 1703 | keep_going (ecs); |
| 1704 | registers_changed (); |
| 1705 | return; |
| 1706 | } |
| 1707 | } |
| 1708 | else if (singlestep_breakpoints_inserted_p) |
| 1709 | { |
| 1710 | sw_single_step_trap_p = 1; |
| 1711 | ecs->random_signal = 0; |
| 1712 | } |
| 1713 | } |
| 1714 | else |
| 1715 | ecs->random_signal = 1; |
| 1716 | |
| 1717 | /* See if something interesting happened to the non-current thread. If |
| 1718 | so, then switch to that thread. */ |
| 1719 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
| 1720 | { |
| 1721 | if (debug_infrun) |
| 1722 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
| 1723 | |
| 1724 | context_switch (ecs); |
| 1725 | |
| 1726 | if (deprecated_context_hook) |
| 1727 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); |
| 1728 | } |
| 1729 | |
| 1730 | if (singlestep_breakpoints_inserted_p) |
| 1731 | { |
| 1732 | /* Pull the single step breakpoints out of the target. */ |
| 1733 | remove_single_step_breakpoints (); |
| 1734 | singlestep_breakpoints_inserted_p = 0; |
| 1735 | } |
| 1736 | |
| 1737 | /* It may not be necessary to disable the watchpoint to stop over |
| 1738 | it. For example, the PA can (with some kernel cooperation) |
| 1739 | single step over a watchpoint without disabling the watchpoint. */ |
| 1740 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) |
| 1741 | { |
| 1742 | if (debug_infrun) |
| 1743 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
| 1744 | resume (1, 0); |
| 1745 | prepare_to_wait (ecs); |
| 1746 | return; |
| 1747 | } |
| 1748 | |
| 1749 | /* It is far more common to need to disable a watchpoint to step |
| 1750 | the inferior over it. FIXME. What else might a debug |
| 1751 | register or page protection watchpoint scheme need here? */ |
| 1752 | if (gdbarch_have_nonsteppable_watchpoint (current_gdbarch) |
| 1753 | && STOPPED_BY_WATCHPOINT (ecs->ws)) |
| 1754 | { |
| 1755 | /* At this point, we are stopped at an instruction which has |
| 1756 | attempted to write to a piece of memory under control of |
| 1757 | a watchpoint. The instruction hasn't actually executed |
| 1758 | yet. If we were to evaluate the watchpoint expression |
| 1759 | now, we would get the old value, and therefore no change |
| 1760 | would seem to have occurred. |
| 1761 | |
| 1762 | In order to make watchpoints work `right', we really need |
| 1763 | to complete the memory write, and then evaluate the |
| 1764 | watchpoint expression. The following code does that by |
| 1765 | removing the watchpoint (actually, all watchpoints and |
| 1766 | breakpoints), single-stepping the target, re-inserting |
| 1767 | watchpoints, and then falling through to let normal |
| 1768 | single-step processing handle proceed. Since this |
| 1769 | includes evaluating watchpoints, things will come to a |
| 1770 | stop in the correct manner. */ |
| 1771 | |
| 1772 | if (debug_infrun) |
| 1773 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
| 1774 | remove_breakpoints (); |
| 1775 | registers_changed (); |
| 1776 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ |
| 1777 | |
| 1778 | ecs->waiton_ptid = ecs->ptid; |
| 1779 | ecs->wp = &(ecs->ws); |
| 1780 | ecs->infwait_state = infwait_nonstep_watch_state; |
| 1781 | prepare_to_wait (ecs); |
| 1782 | return; |
| 1783 | } |
| 1784 | |
| 1785 | /* It may be possible to simply continue after a watchpoint. */ |
| 1786 | if (HAVE_CONTINUABLE_WATCHPOINT) |
| 1787 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
| 1788 | |
| 1789 | ecs->stop_func_start = 0; |
| 1790 | ecs->stop_func_end = 0; |
| 1791 | ecs->stop_func_name = 0; |
| 1792 | /* Don't care about return value; stop_func_start and stop_func_name |
| 1793 | will both be 0 if it doesn't work. */ |
| 1794 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, |
| 1795 | &ecs->stop_func_start, &ecs->stop_func_end); |
| 1796 | ecs->stop_func_start |
| 1797 | += gdbarch_deprecated_function_start_offset (current_gdbarch); |
| 1798 | ecs->another_trap = 0; |
| 1799 | bpstat_clear (&stop_bpstat); |
| 1800 | stop_step = 0; |
| 1801 | stop_stack_dummy = 0; |
| 1802 | stop_print_frame = 1; |
| 1803 | ecs->random_signal = 0; |
| 1804 | stopped_by_random_signal = 0; |
| 1805 | |
| 1806 | if (stop_signal == TARGET_SIGNAL_TRAP |
| 1807 | && trap_expected |
| 1808 | && gdbarch_single_step_through_delay_p (current_gdbarch) |
| 1809 | && currently_stepping (ecs)) |
| 1810 | { |
| 1811 | /* We're trying to step of a breakpoint. Turns out that we're |
| 1812 | also on an instruction that needs to be stepped multiple |
| 1813 | times before it's been fully executing. E.g., architectures |
| 1814 | with a delay slot. It needs to be stepped twice, once for |
| 1815 | the instruction and once for the delay slot. */ |
| 1816 | int step_through_delay |
| 1817 | = gdbarch_single_step_through_delay (current_gdbarch, |
| 1818 | get_current_frame ()); |
| 1819 | if (debug_infrun && step_through_delay) |
| 1820 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
| 1821 | if (step_range_end == 0 && step_through_delay) |
| 1822 | { |
| 1823 | /* The user issued a continue when stopped at a breakpoint. |
| 1824 | Set up for another trap and get out of here. */ |
| 1825 | ecs->another_trap = 1; |
| 1826 | keep_going (ecs); |
| 1827 | return; |
| 1828 | } |
| 1829 | else if (step_through_delay) |
| 1830 | { |
| 1831 | /* The user issued a step when stopped at a breakpoint. |
| 1832 | Maybe we should stop, maybe we should not - the delay |
| 1833 | slot *might* correspond to a line of source. In any |
| 1834 | case, don't decide that here, just set ecs->another_trap, |
| 1835 | making sure we single-step again before breakpoints are |
| 1836 | re-inserted. */ |
| 1837 | ecs->another_trap = 1; |
| 1838 | } |
| 1839 | } |
| 1840 | |
| 1841 | /* Look at the cause of the stop, and decide what to do. |
| 1842 | The alternatives are: |
| 1843 | 1) break; to really stop and return to the debugger, |
| 1844 | 2) drop through to start up again |
| 1845 | (set ecs->another_trap to 1 to single step once) |
| 1846 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
| 1847 | will be made according to the signal handling tables. */ |
| 1848 | |
| 1849 | /* First, distinguish signals caused by the debugger from signals |
| 1850 | that have to do with the program's own actions. Note that |
| 1851 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending |
| 1852 | on the operating system version. Here we detect when a SIGILL or |
| 1853 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do |
| 1854 | something similar for SIGSEGV, since a SIGSEGV will be generated |
| 1855 | when we're trying to execute a breakpoint instruction on a |
| 1856 | non-executable stack. This happens for call dummy breakpoints |
| 1857 | for architectures like SPARC that place call dummies on the |
| 1858 | stack. */ |
| 1859 | |
| 1860 | if (stop_signal == TARGET_SIGNAL_TRAP |
| 1861 | || (breakpoints_inserted |
| 1862 | && (stop_signal == TARGET_SIGNAL_ILL |
| 1863 | || stop_signal == TARGET_SIGNAL_SEGV |
| 1864 | || stop_signal == TARGET_SIGNAL_EMT)) |
| 1865 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
| 1866 | { |
| 1867 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) |
| 1868 | { |
| 1869 | if (debug_infrun) |
| 1870 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
| 1871 | stop_print_frame = 0; |
| 1872 | stop_stepping (ecs); |
| 1873 | return; |
| 1874 | } |
| 1875 | |
| 1876 | /* This is originated from start_remote(), start_inferior() and |
| 1877 | shared libraries hook functions. */ |
| 1878 | if (stop_soon == STOP_QUIETLY) |
| 1879 | { |
| 1880 | if (debug_infrun) |
| 1881 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
| 1882 | stop_stepping (ecs); |
| 1883 | return; |
| 1884 | } |
| 1885 | |
| 1886 | /* This originates from attach_command(). We need to overwrite |
| 1887 | the stop_signal here, because some kernels don't ignore a |
| 1888 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. |
| 1889 | See more comments in inferior.h. */ |
| 1890 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
| 1891 | { |
| 1892 | stop_stepping (ecs); |
| 1893 | if (stop_signal == TARGET_SIGNAL_STOP) |
| 1894 | stop_signal = TARGET_SIGNAL_0; |
| 1895 | return; |
| 1896 | } |
| 1897 | |
| 1898 | /* Don't even think about breakpoints if just proceeded over a |
| 1899 | breakpoint. */ |
| 1900 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) |
| 1901 | { |
| 1902 | if (debug_infrun) |
| 1903 | fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n"); |
| 1904 | bpstat_clear (&stop_bpstat); |
| 1905 | } |
| 1906 | else |
| 1907 | { |
| 1908 | /* See if there is a breakpoint at the current PC. */ |
| 1909 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
| 1910 | stopped_by_watchpoint); |
| 1911 | |
| 1912 | /* Following in case break condition called a |
| 1913 | function. */ |
| 1914 | stop_print_frame = 1; |
| 1915 | } |
| 1916 | |
| 1917 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
| 1918 | at one stage in the past included checks for an inferior |
| 1919 | function call's call dummy's return breakpoint. The original |
| 1920 | comment, that went with the test, read: |
| 1921 | |
| 1922 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
| 1923 | another signal besides SIGTRAP, so check here as well as |
| 1924 | above.'' |
| 1925 | |
| 1926 | If someone ever tries to get get call dummys on a |
| 1927 | non-executable stack to work (where the target would stop |
| 1928 | with something like a SIGSEGV), then those tests might need |
| 1929 | to be re-instated. Given, however, that the tests were only |
| 1930 | enabled when momentary breakpoints were not being used, I |
| 1931 | suspect that it won't be the case. |
| 1932 | |
| 1933 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
| 1934 | be necessary for call dummies on a non-executable stack on |
| 1935 | SPARC. */ |
| 1936 | |
| 1937 | if (stop_signal == TARGET_SIGNAL_TRAP) |
| 1938 | ecs->random_signal |
| 1939 | = !(bpstat_explains_signal (stop_bpstat) |
| 1940 | || trap_expected |
| 1941 | || (step_range_end && step_resume_breakpoint == NULL)); |
| 1942 | else |
| 1943 | { |
| 1944 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
| 1945 | if (!ecs->random_signal) |
| 1946 | stop_signal = TARGET_SIGNAL_TRAP; |
| 1947 | } |
| 1948 | } |
| 1949 | |
| 1950 | /* When we reach this point, we've pretty much decided |
| 1951 | that the reason for stopping must've been a random |
| 1952 | (unexpected) signal. */ |
| 1953 | |
| 1954 | else |
| 1955 | ecs->random_signal = 1; |
| 1956 | |
| 1957 | process_event_stop_test: |
| 1958 | /* For the program's own signals, act according to |
| 1959 | the signal handling tables. */ |
| 1960 | |
| 1961 | if (ecs->random_signal) |
| 1962 | { |
| 1963 | /* Signal not for debugging purposes. */ |
| 1964 | int printed = 0; |
| 1965 | |
| 1966 | if (debug_infrun) |
| 1967 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal); |
| 1968 | |
| 1969 | stopped_by_random_signal = 1; |
| 1970 | |
| 1971 | if (signal_print[stop_signal]) |
| 1972 | { |
| 1973 | printed = 1; |
| 1974 | target_terminal_ours_for_output (); |
| 1975 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); |
| 1976 | } |
| 1977 | if (signal_stop[stop_signal]) |
| 1978 | { |
| 1979 | stop_stepping (ecs); |
| 1980 | return; |
| 1981 | } |
| 1982 | /* If not going to stop, give terminal back |
| 1983 | if we took it away. */ |
| 1984 | else if (printed) |
| 1985 | target_terminal_inferior (); |
| 1986 | |
| 1987 | /* Clear the signal if it should not be passed. */ |
| 1988 | if (signal_program[stop_signal] == 0) |
| 1989 | stop_signal = TARGET_SIGNAL_0; |
| 1990 | |
| 1991 | if (prev_pc == read_pc () |
| 1992 | && !breakpoints_inserted |
| 1993 | && breakpoint_here_p (read_pc ()) |
| 1994 | && step_resume_breakpoint == NULL) |
| 1995 | { |
| 1996 | /* We were just starting a new sequence, attempting to |
| 1997 | single-step off of a breakpoint and expecting a SIGTRAP. |
| 1998 | Intead this signal arrives. This signal will take us out |
| 1999 | of the stepping range so GDB needs to remember to, when |
| 2000 | the signal handler returns, resume stepping off that |
| 2001 | breakpoint. */ |
| 2002 | /* To simplify things, "continue" is forced to use the same |
| 2003 | code paths as single-step - set a breakpoint at the |
| 2004 | signal return address and then, once hit, step off that |
| 2005 | breakpoint. */ |
| 2006 | |
| 2007 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
| 2008 | ecs->step_after_step_resume_breakpoint = 1; |
| 2009 | keep_going (ecs); |
| 2010 | return; |
| 2011 | } |
| 2012 | |
| 2013 | if (step_range_end != 0 |
| 2014 | && stop_signal != TARGET_SIGNAL_0 |
| 2015 | && stop_pc >= step_range_start && stop_pc < step_range_end |
| 2016 | && frame_id_eq (get_frame_id (get_current_frame ()), |
| 2017 | step_frame_id) |
| 2018 | && step_resume_breakpoint == NULL) |
| 2019 | { |
| 2020 | /* The inferior is about to take a signal that will take it |
| 2021 | out of the single step range. Set a breakpoint at the |
| 2022 | current PC (which is presumably where the signal handler |
| 2023 | will eventually return) and then allow the inferior to |
| 2024 | run free. |
| 2025 | |
| 2026 | Note that this is only needed for a signal delivered |
| 2027 | while in the single-step range. Nested signals aren't a |
| 2028 | problem as they eventually all return. */ |
| 2029 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
| 2030 | keep_going (ecs); |
| 2031 | return; |
| 2032 | } |
| 2033 | |
| 2034 | /* Note: step_resume_breakpoint may be non-NULL. This occures |
| 2035 | when either there's a nested signal, or when there's a |
| 2036 | pending signal enabled just as the signal handler returns |
| 2037 | (leaving the inferior at the step-resume-breakpoint without |
| 2038 | actually executing it). Either way continue until the |
| 2039 | breakpoint is really hit. */ |
| 2040 | keep_going (ecs); |
| 2041 | return; |
| 2042 | } |
| 2043 | |
| 2044 | /* Handle cases caused by hitting a breakpoint. */ |
| 2045 | { |
| 2046 | CORE_ADDR jmp_buf_pc; |
| 2047 | struct bpstat_what what; |
| 2048 | |
| 2049 | what = bpstat_what (stop_bpstat); |
| 2050 | |
| 2051 | if (what.call_dummy) |
| 2052 | { |
| 2053 | stop_stack_dummy = 1; |
| 2054 | } |
| 2055 | |
| 2056 | switch (what.main_action) |
| 2057 | { |
| 2058 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
| 2059 | /* If we hit the breakpoint at longjmp, disable it for the |
| 2060 | duration of this command. Then, install a temporary |
| 2061 | breakpoint at the target of the jmp_buf. */ |
| 2062 | if (debug_infrun) |
| 2063 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); |
| 2064 | disable_longjmp_breakpoint (); |
| 2065 | remove_breakpoints (); |
| 2066 | breakpoints_inserted = 0; |
| 2067 | if (!gdbarch_get_longjmp_target_p (current_gdbarch) |
| 2068 | || !gdbarch_get_longjmp_target (current_gdbarch, |
| 2069 | get_current_frame (), &jmp_buf_pc)) |
| 2070 | { |
| 2071 | keep_going (ecs); |
| 2072 | return; |
| 2073 | } |
| 2074 | |
| 2075 | /* Need to blow away step-resume breakpoint, as it |
| 2076 | interferes with us */ |
| 2077 | if (step_resume_breakpoint != NULL) |
| 2078 | { |
| 2079 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
| 2080 | } |
| 2081 | |
| 2082 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
| 2083 | ecs->handling_longjmp = 1; /* FIXME */ |
| 2084 | keep_going (ecs); |
| 2085 | return; |
| 2086 | |
| 2087 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
| 2088 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: |
| 2089 | if (debug_infrun) |
| 2090 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); |
| 2091 | remove_breakpoints (); |
| 2092 | breakpoints_inserted = 0; |
| 2093 | disable_longjmp_breakpoint (); |
| 2094 | ecs->handling_longjmp = 0; /* FIXME */ |
| 2095 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) |
| 2096 | break; |
| 2097 | /* else fallthrough */ |
| 2098 | |
| 2099 | case BPSTAT_WHAT_SINGLE: |
| 2100 | if (debug_infrun) |
| 2101 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
| 2102 | if (breakpoints_inserted) |
| 2103 | remove_breakpoints (); |
| 2104 | breakpoints_inserted = 0; |
| 2105 | ecs->another_trap = 1; |
| 2106 | /* Still need to check other stuff, at least the case |
| 2107 | where we are stepping and step out of the right range. */ |
| 2108 | break; |
| 2109 | |
| 2110 | case BPSTAT_WHAT_STOP_NOISY: |
| 2111 | if (debug_infrun) |
| 2112 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
| 2113 | stop_print_frame = 1; |
| 2114 | |
| 2115 | /* We are about to nuke the step_resume_breakpointt via the |
| 2116 | cleanup chain, so no need to worry about it here. */ |
| 2117 | |
| 2118 | stop_stepping (ecs); |
| 2119 | return; |
| 2120 | |
| 2121 | case BPSTAT_WHAT_STOP_SILENT: |
| 2122 | if (debug_infrun) |
| 2123 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
| 2124 | stop_print_frame = 0; |
| 2125 | |
| 2126 | /* We are about to nuke the step_resume_breakpoin via the |
| 2127 | cleanup chain, so no need to worry about it here. */ |
| 2128 | |
| 2129 | stop_stepping (ecs); |
| 2130 | return; |
| 2131 | |
| 2132 | case BPSTAT_WHAT_STEP_RESUME: |
| 2133 | /* This proably demands a more elegant solution, but, yeah |
| 2134 | right... |
| 2135 | |
| 2136 | This function's use of the simple variable |
| 2137 | step_resume_breakpoint doesn't seem to accomodate |
| 2138 | simultaneously active step-resume bp's, although the |
| 2139 | breakpoint list certainly can. |
| 2140 | |
| 2141 | If we reach here and step_resume_breakpoint is already |
| 2142 | NULL, then apparently we have multiple active |
| 2143 | step-resume bp's. We'll just delete the breakpoint we |
| 2144 | stopped at, and carry on. |
| 2145 | |
| 2146 | Correction: what the code currently does is delete a |
| 2147 | step-resume bp, but it makes no effort to ensure that |
| 2148 | the one deleted is the one currently stopped at. MVS */ |
| 2149 | |
| 2150 | if (debug_infrun) |
| 2151 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
| 2152 | |
| 2153 | if (step_resume_breakpoint == NULL) |
| 2154 | { |
| 2155 | step_resume_breakpoint = |
| 2156 | bpstat_find_step_resume_breakpoint (stop_bpstat); |
| 2157 | } |
| 2158 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
| 2159 | if (ecs->step_after_step_resume_breakpoint) |
| 2160 | { |
| 2161 | /* Back when the step-resume breakpoint was inserted, we |
| 2162 | were trying to single-step off a breakpoint. Go back |
| 2163 | to doing that. */ |
| 2164 | ecs->step_after_step_resume_breakpoint = 0; |
| 2165 | remove_breakpoints (); |
| 2166 | breakpoints_inserted = 0; |
| 2167 | ecs->another_trap = 1; |
| 2168 | keep_going (ecs); |
| 2169 | return; |
| 2170 | } |
| 2171 | break; |
| 2172 | |
| 2173 | case BPSTAT_WHAT_CHECK_SHLIBS: |
| 2174 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: |
| 2175 | { |
| 2176 | if (debug_infrun) |
| 2177 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n"); |
| 2178 | /* Remove breakpoints, we eventually want to step over the |
| 2179 | shlib event breakpoint, and SOLIB_ADD might adjust |
| 2180 | breakpoint addresses via breakpoint_re_set. */ |
| 2181 | if (breakpoints_inserted) |
| 2182 | remove_breakpoints (); |
| 2183 | breakpoints_inserted = 0; |
| 2184 | |
| 2185 | /* Check for any newly added shared libraries if we're |
| 2186 | supposed to be adding them automatically. Switch |
| 2187 | terminal for any messages produced by |
| 2188 | breakpoint_re_set. */ |
| 2189 | target_terminal_ours_for_output (); |
| 2190 | /* NOTE: cagney/2003-11-25: Make certain that the target |
| 2191 | stack's section table is kept up-to-date. Architectures, |
| 2192 | (e.g., PPC64), use the section table to perform |
| 2193 | operations such as address => section name and hence |
| 2194 | require the table to contain all sections (including |
| 2195 | those found in shared libraries). */ |
| 2196 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
| 2197 | exec_ops to SOLIB_ADD. This is because current GDB is |
| 2198 | only tooled to propagate section_table changes out from |
| 2199 | the "current_target" (see target_resize_to_sections), and |
| 2200 | not up from the exec stratum. This, of course, isn't |
| 2201 | right. "infrun.c" should only interact with the |
| 2202 | exec/process stratum, instead relying on the target stack |
| 2203 | to propagate relevant changes (stop, section table |
| 2204 | changed, ...) up to other layers. */ |
| 2205 | #ifdef SOLIB_ADD |
| 2206 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
| 2207 | #else |
| 2208 | solib_add (NULL, 0, ¤t_target, auto_solib_add); |
| 2209 | #endif |
| 2210 | target_terminal_inferior (); |
| 2211 | |
| 2212 | /* Try to reenable shared library breakpoints, additional |
| 2213 | code segments in shared libraries might be mapped in now. */ |
| 2214 | re_enable_breakpoints_in_shlibs (); |
| 2215 | |
| 2216 | /* If requested, stop when the dynamic linker notifies |
| 2217 | gdb of events. This allows the user to get control |
| 2218 | and place breakpoints in initializer routines for |
| 2219 | dynamically loaded objects (among other things). */ |
| 2220 | if (stop_on_solib_events || stop_stack_dummy) |
| 2221 | { |
| 2222 | stop_stepping (ecs); |
| 2223 | return; |
| 2224 | } |
| 2225 | |
| 2226 | /* If we stopped due to an explicit catchpoint, then the |
| 2227 | (see above) call to SOLIB_ADD pulled in any symbols |
| 2228 | from a newly-loaded library, if appropriate. |
| 2229 | |
| 2230 | We do want the inferior to stop, but not where it is |
| 2231 | now, which is in the dynamic linker callback. Rather, |
| 2232 | we would like it stop in the user's program, just after |
| 2233 | the call that caused this catchpoint to trigger. That |
| 2234 | gives the user a more useful vantage from which to |
| 2235 | examine their program's state. */ |
| 2236 | else if (what.main_action |
| 2237 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) |
| 2238 | { |
| 2239 | /* ??rehrauer: If I could figure out how to get the |
| 2240 | right return PC from here, we could just set a temp |
| 2241 | breakpoint and resume. I'm not sure we can without |
| 2242 | cracking open the dld's shared libraries and sniffing |
| 2243 | their unwind tables and text/data ranges, and that's |
| 2244 | not a terribly portable notion. |
| 2245 | |
| 2246 | Until that time, we must step the inferior out of the |
| 2247 | dld callback, and also out of the dld itself (and any |
| 2248 | code or stubs in libdld.sl, such as "shl_load" and |
| 2249 | friends) until we reach non-dld code. At that point, |
| 2250 | we can stop stepping. */ |
| 2251 | bpstat_get_triggered_catchpoints (stop_bpstat, |
| 2252 | &ecs-> |
| 2253 | stepping_through_solib_catchpoints); |
| 2254 | ecs->stepping_through_solib_after_catch = 1; |
| 2255 | |
| 2256 | /* Be sure to lift all breakpoints, so the inferior does |
| 2257 | actually step past this point... */ |
| 2258 | ecs->another_trap = 1; |
| 2259 | break; |
| 2260 | } |
| 2261 | else |
| 2262 | { |
| 2263 | /* We want to step over this breakpoint, then keep going. */ |
| 2264 | ecs->another_trap = 1; |
| 2265 | break; |
| 2266 | } |
| 2267 | } |
| 2268 | break; |
| 2269 | |
| 2270 | case BPSTAT_WHAT_LAST: |
| 2271 | /* Not a real code, but listed here to shut up gcc -Wall. */ |
| 2272 | |
| 2273 | case BPSTAT_WHAT_KEEP_CHECKING: |
| 2274 | break; |
| 2275 | } |
| 2276 | } |
| 2277 | |
| 2278 | /* We come here if we hit a breakpoint but should not |
| 2279 | stop for it. Possibly we also were stepping |
| 2280 | and should stop for that. So fall through and |
| 2281 | test for stepping. But, if not stepping, |
| 2282 | do not stop. */ |
| 2283 | |
| 2284 | /* Are we stepping to get the inferior out of the dynamic linker's |
| 2285 | hook (and possibly the dld itself) after catching a shlib |
| 2286 | event? */ |
| 2287 | if (ecs->stepping_through_solib_after_catch) |
| 2288 | { |
| 2289 | #if defined(SOLIB_ADD) |
| 2290 | /* Have we reached our destination? If not, keep going. */ |
| 2291 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) |
| 2292 | { |
| 2293 | if (debug_infrun) |
| 2294 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
| 2295 | ecs->another_trap = 1; |
| 2296 | keep_going (ecs); |
| 2297 | return; |
| 2298 | } |
| 2299 | #endif |
| 2300 | if (debug_infrun) |
| 2301 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
| 2302 | /* Else, stop and report the catchpoint(s) whose triggering |
| 2303 | caused us to begin stepping. */ |
| 2304 | ecs->stepping_through_solib_after_catch = 0; |
| 2305 | bpstat_clear (&stop_bpstat); |
| 2306 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); |
| 2307 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); |
| 2308 | stop_print_frame = 1; |
| 2309 | stop_stepping (ecs); |
| 2310 | return; |
| 2311 | } |
| 2312 | |
| 2313 | if (step_resume_breakpoint) |
| 2314 | { |
| 2315 | if (debug_infrun) |
| 2316 | fprintf_unfiltered (gdb_stdlog, |
| 2317 | "infrun: step-resume breakpoint is inserted\n"); |
| 2318 | |
| 2319 | /* Having a step-resume breakpoint overrides anything |
| 2320 | else having to do with stepping commands until |
| 2321 | that breakpoint is reached. */ |
| 2322 | keep_going (ecs); |
| 2323 | return; |
| 2324 | } |
| 2325 | |
| 2326 | if (step_range_end == 0) |
| 2327 | { |
| 2328 | if (debug_infrun) |
| 2329 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
| 2330 | /* Likewise if we aren't even stepping. */ |
| 2331 | keep_going (ecs); |
| 2332 | return; |
| 2333 | } |
| 2334 | |
| 2335 | /* If stepping through a line, keep going if still within it. |
| 2336 | |
| 2337 | Note that step_range_end is the address of the first instruction |
| 2338 | beyond the step range, and NOT the address of the last instruction |
| 2339 | within it! */ |
| 2340 | if (stop_pc >= step_range_start && stop_pc < step_range_end) |
| 2341 | { |
| 2342 | if (debug_infrun) |
| 2343 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
| 2344 | paddr_nz (step_range_start), |
| 2345 | paddr_nz (step_range_end)); |
| 2346 | keep_going (ecs); |
| 2347 | return; |
| 2348 | } |
| 2349 | |
| 2350 | /* We stepped out of the stepping range. */ |
| 2351 | |
| 2352 | /* If we are stepping at the source level and entered the runtime |
| 2353 | loader dynamic symbol resolution code, we keep on single stepping |
| 2354 | until we exit the run time loader code and reach the callee's |
| 2355 | address. */ |
| 2356 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE |
| 2357 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE |
| 2358 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc) |
| 2359 | #else |
| 2360 | && in_solib_dynsym_resolve_code (stop_pc) |
| 2361 | #endif |
| 2362 | ) |
| 2363 | { |
| 2364 | CORE_ADDR pc_after_resolver = |
| 2365 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); |
| 2366 | |
| 2367 | if (debug_infrun) |
| 2368 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
| 2369 | |
| 2370 | if (pc_after_resolver) |
| 2371 | { |
| 2372 | /* Set up a step-resume breakpoint at the address |
| 2373 | indicated by SKIP_SOLIB_RESOLVER. */ |
| 2374 | struct symtab_and_line sr_sal; |
| 2375 | init_sal (&sr_sal); |
| 2376 | sr_sal.pc = pc_after_resolver; |
| 2377 | |
| 2378 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
| 2379 | } |
| 2380 | |
| 2381 | keep_going (ecs); |
| 2382 | return; |
| 2383 | } |
| 2384 | |
| 2385 | if (step_range_end != 1 |
| 2386 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE |
| 2387 | || step_over_calls == STEP_OVER_ALL) |
| 2388 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) |
| 2389 | { |
| 2390 | if (debug_infrun) |
| 2391 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
| 2392 | /* The inferior, while doing a "step" or "next", has ended up in |
| 2393 | a signal trampoline (either by a signal being delivered or by |
| 2394 | the signal handler returning). Just single-step until the |
| 2395 | inferior leaves the trampoline (either by calling the handler |
| 2396 | or returning). */ |
| 2397 | keep_going (ecs); |
| 2398 | return; |
| 2399 | } |
| 2400 | |
| 2401 | /* Check for subroutine calls. The check for the current frame |
| 2402 | equalling the step ID is not necessary - the check of the |
| 2403 | previous frame's ID is sufficient - but it is a common case and |
| 2404 | cheaper than checking the previous frame's ID. |
| 2405 | |
| 2406 | NOTE: frame_id_eq will never report two invalid frame IDs as |
| 2407 | being equal, so to get into this block, both the current and |
| 2408 | previous frame must have valid frame IDs. */ |
| 2409 | if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id) |
| 2410 | && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) |
| 2411 | { |
| 2412 | CORE_ADDR real_stop_pc; |
| 2413 | |
| 2414 | if (debug_infrun) |
| 2415 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
| 2416 | |
| 2417 | if ((step_over_calls == STEP_OVER_NONE) |
| 2418 | || ((step_range_end == 1) |
| 2419 | && in_prologue (prev_pc, ecs->stop_func_start))) |
| 2420 | { |
| 2421 | /* I presume that step_over_calls is only 0 when we're |
| 2422 | supposed to be stepping at the assembly language level |
| 2423 | ("stepi"). Just stop. */ |
| 2424 | /* Also, maybe we just did a "nexti" inside a prolog, so we |
| 2425 | thought it was a subroutine call but it was not. Stop as |
| 2426 | well. FENN */ |
| 2427 | stop_step = 1; |
| 2428 | print_stop_reason (END_STEPPING_RANGE, 0); |
| 2429 | stop_stepping (ecs); |
| 2430 | return; |
| 2431 | } |
| 2432 | |
| 2433 | if (step_over_calls == STEP_OVER_ALL) |
| 2434 | { |
| 2435 | /* We're doing a "next", set a breakpoint at callee's return |
| 2436 | address (the address at which the caller will |
| 2437 | resume). */ |
| 2438 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
| 2439 | keep_going (ecs); |
| 2440 | return; |
| 2441 | } |
| 2442 | |
| 2443 | /* If we are in a function call trampoline (a stub between the |
| 2444 | calling routine and the real function), locate the real |
| 2445 | function. That's what tells us (a) whether we want to step |
| 2446 | into it at all, and (b) what prologue we want to run to the |
| 2447 | end of, if we do step into it. */ |
| 2448 | real_stop_pc = skip_language_trampoline (get_current_frame (), stop_pc); |
| 2449 | if (real_stop_pc == 0) |
| 2450 | real_stop_pc = gdbarch_skip_trampoline_code |
| 2451 | (current_gdbarch, get_current_frame (), stop_pc); |
| 2452 | if (real_stop_pc != 0) |
| 2453 | ecs->stop_func_start = real_stop_pc; |
| 2454 | |
| 2455 | if ( |
| 2456 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE |
| 2457 | IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start) |
| 2458 | #else |
| 2459 | in_solib_dynsym_resolve_code (ecs->stop_func_start) |
| 2460 | #endif |
| 2461 | ) |
| 2462 | { |
| 2463 | struct symtab_and_line sr_sal; |
| 2464 | init_sal (&sr_sal); |
| 2465 | sr_sal.pc = ecs->stop_func_start; |
| 2466 | |
| 2467 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
| 2468 | keep_going (ecs); |
| 2469 | return; |
| 2470 | } |
| 2471 | |
| 2472 | /* If we have line number information for the function we are |
| 2473 | thinking of stepping into, step into it. |
| 2474 | |
| 2475 | If there are several symtabs at that PC (e.g. with include |
| 2476 | files), just want to know whether *any* of them have line |
| 2477 | numbers. find_pc_line handles this. */ |
| 2478 | { |
| 2479 | struct symtab_and_line tmp_sal; |
| 2480 | |
| 2481 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
| 2482 | if (tmp_sal.line != 0) |
| 2483 | { |
| 2484 | step_into_function (ecs); |
| 2485 | return; |
| 2486 | } |
| 2487 | } |
| 2488 | |
| 2489 | /* If we have no line number and the step-stop-if-no-debug is |
| 2490 | set, we stop the step so that the user has a chance to switch |
| 2491 | in assembly mode. */ |
| 2492 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
| 2493 | { |
| 2494 | stop_step = 1; |
| 2495 | print_stop_reason (END_STEPPING_RANGE, 0); |
| 2496 | stop_stepping (ecs); |
| 2497 | return; |
| 2498 | } |
| 2499 | |
| 2500 | /* Set a breakpoint at callee's return address (the address at |
| 2501 | which the caller will resume). */ |
| 2502 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
| 2503 | keep_going (ecs); |
| 2504 | return; |
| 2505 | } |
| 2506 | |
| 2507 | /* If we're in the return path from a shared library trampoline, |
| 2508 | we want to proceed through the trampoline when stepping. */ |
| 2509 | if (gdbarch_in_solib_return_trampoline (current_gdbarch, |
| 2510 | stop_pc, ecs->stop_func_name)) |
| 2511 | { |
| 2512 | /* Determine where this trampoline returns. */ |
| 2513 | CORE_ADDR real_stop_pc; |
| 2514 | real_stop_pc = gdbarch_skip_trampoline_code |
| 2515 | (current_gdbarch, get_current_frame (), stop_pc); |
| 2516 | |
| 2517 | if (debug_infrun) |
| 2518 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
| 2519 | |
| 2520 | /* Only proceed through if we know where it's going. */ |
| 2521 | if (real_stop_pc) |
| 2522 | { |
| 2523 | /* And put the step-breakpoint there and go until there. */ |
| 2524 | struct symtab_and_line sr_sal; |
| 2525 | |
| 2526 | init_sal (&sr_sal); /* initialize to zeroes */ |
| 2527 | sr_sal.pc = real_stop_pc; |
| 2528 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
| 2529 | |
| 2530 | /* Do not specify what the fp should be when we stop since |
| 2531 | on some machines the prologue is where the new fp value |
| 2532 | is established. */ |
| 2533 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
| 2534 | |
| 2535 | /* Restart without fiddling with the step ranges or |
| 2536 | other state. */ |
| 2537 | keep_going (ecs); |
| 2538 | return; |
| 2539 | } |
| 2540 | } |
| 2541 | |
| 2542 | ecs->sal = find_pc_line (stop_pc, 0); |
| 2543 | |
| 2544 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
| 2545 | the trampoline processing logic, however, there are some trampolines |
| 2546 | that have no names, so we should do trampoline handling first. */ |
| 2547 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE |
| 2548 | && ecs->stop_func_name == NULL |
| 2549 | && ecs->sal.line == 0) |
| 2550 | { |
| 2551 | if (debug_infrun) |
| 2552 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
| 2553 | |
| 2554 | /* The inferior just stepped into, or returned to, an |
| 2555 | undebuggable function (where there is no debugging information |
| 2556 | and no line number corresponding to the address where the |
| 2557 | inferior stopped). Since we want to skip this kind of code, |
| 2558 | we keep going until the inferior returns from this |
| 2559 | function - unless the user has asked us not to (via |
| 2560 | set step-mode) or we no longer know how to get back |
| 2561 | to the call site. */ |
| 2562 | if (step_stop_if_no_debug |
| 2563 | || !frame_id_p (frame_unwind_id (get_current_frame ()))) |
| 2564 | { |
| 2565 | /* If we have no line number and the step-stop-if-no-debug |
| 2566 | is set, we stop the step so that the user has a chance to |
| 2567 | switch in assembly mode. */ |
| 2568 | stop_step = 1; |
| 2569 | print_stop_reason (END_STEPPING_RANGE, 0); |
| 2570 | stop_stepping (ecs); |
| 2571 | return; |
| 2572 | } |
| 2573 | else |
| 2574 | { |
| 2575 | /* Set a breakpoint at callee's return address (the address |
| 2576 | at which the caller will resume). */ |
| 2577 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
| 2578 | keep_going (ecs); |
| 2579 | return; |
| 2580 | } |
| 2581 | } |
| 2582 | |
| 2583 | if (step_range_end == 1) |
| 2584 | { |
| 2585 | /* It is stepi or nexti. We always want to stop stepping after |
| 2586 | one instruction. */ |
| 2587 | if (debug_infrun) |
| 2588 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
| 2589 | stop_step = 1; |
| 2590 | print_stop_reason (END_STEPPING_RANGE, 0); |
| 2591 | stop_stepping (ecs); |
| 2592 | return; |
| 2593 | } |
| 2594 | |
| 2595 | if (ecs->sal.line == 0) |
| 2596 | { |
| 2597 | /* We have no line number information. That means to stop |
| 2598 | stepping (does this always happen right after one instruction, |
| 2599 | when we do "s" in a function with no line numbers, |
| 2600 | or can this happen as a result of a return or longjmp?). */ |
| 2601 | if (debug_infrun) |
| 2602 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
| 2603 | stop_step = 1; |
| 2604 | print_stop_reason (END_STEPPING_RANGE, 0); |
| 2605 | stop_stepping (ecs); |
| 2606 | return; |
| 2607 | } |
| 2608 | |
| 2609 | if ((stop_pc == ecs->sal.pc) |
| 2610 | && (ecs->current_line != ecs->sal.line |
| 2611 | || ecs->current_symtab != ecs->sal.symtab)) |
| 2612 | { |
| 2613 | /* We are at the start of a different line. So stop. Note that |
| 2614 | we don't stop if we step into the middle of a different line. |
| 2615 | That is said to make things like for (;;) statements work |
| 2616 | better. */ |
| 2617 | if (debug_infrun) |
| 2618 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
| 2619 | stop_step = 1; |
| 2620 | print_stop_reason (END_STEPPING_RANGE, 0); |
| 2621 | stop_stepping (ecs); |
| 2622 | return; |
| 2623 | } |
| 2624 | |
| 2625 | /* We aren't done stepping. |
| 2626 | |
| 2627 | Optimize by setting the stepping range to the line. |
| 2628 | (We might not be in the original line, but if we entered a |
| 2629 | new line in mid-statement, we continue stepping. This makes |
| 2630 | things like for(;;) statements work better.) */ |
| 2631 | |
| 2632 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
| 2633 | { |
| 2634 | /* If this is the last line of the function, don't keep stepping |
| 2635 | (it would probably step us out of the function). |
| 2636 | This is particularly necessary for a one-line function, |
| 2637 | in which after skipping the prologue we better stop even though |
| 2638 | we will be in mid-line. */ |
| 2639 | if (debug_infrun) |
| 2640 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n"); |
| 2641 | stop_step = 1; |
| 2642 | print_stop_reason (END_STEPPING_RANGE, 0); |
| 2643 | stop_stepping (ecs); |
| 2644 | return; |
| 2645 | } |
| 2646 | step_range_start = ecs->sal.pc; |
| 2647 | step_range_end = ecs->sal.end; |
| 2648 | step_frame_id = get_frame_id (get_current_frame ()); |
| 2649 | ecs->current_line = ecs->sal.line; |
| 2650 | ecs->current_symtab = ecs->sal.symtab; |
| 2651 | |
| 2652 | /* In the case where we just stepped out of a function into the |
| 2653 | middle of a line of the caller, continue stepping, but |
| 2654 | step_frame_id must be modified to current frame */ |
| 2655 | #if 0 |
| 2656 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too |
| 2657 | generous. It will trigger on things like a step into a frameless |
| 2658 | stackless leaf function. I think the logic should instead look |
| 2659 | at the unwound frame ID has that should give a more robust |
| 2660 | indication of what happened. */ |
| 2661 | if (step - ID == current - ID) |
| 2662 | still stepping in same function; |
| 2663 | else if (step - ID == unwind (current - ID)) |
| 2664 | stepped into a function; |
| 2665 | else |
| 2666 | stepped out of a function; |
| 2667 | /* Of course this assumes that the frame ID unwind code is robust |
| 2668 | and we're willing to introduce frame unwind logic into this |
| 2669 | function. Fortunately, those days are nearly upon us. */ |
| 2670 | #endif |
| 2671 | { |
| 2672 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
| 2673 | if (!(frame_id_inner (current_frame, step_frame_id))) |
| 2674 | step_frame_id = current_frame; |
| 2675 | } |
| 2676 | |
| 2677 | if (debug_infrun) |
| 2678 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
| 2679 | keep_going (ecs); |
| 2680 | } |
| 2681 | |
| 2682 | /* Are we in the middle of stepping? */ |
| 2683 | |
| 2684 | static int |
| 2685 | currently_stepping (struct execution_control_state *ecs) |
| 2686 | { |
| 2687 | return ((!ecs->handling_longjmp |
| 2688 | && ((step_range_end && step_resume_breakpoint == NULL) |
| 2689 | || trap_expected)) |
| 2690 | || ecs->stepping_through_solib_after_catch |
| 2691 | || bpstat_should_step ()); |
| 2692 | } |
| 2693 | |
| 2694 | /* Subroutine call with source code we should not step over. Do step |
| 2695 | to the first line of code in it. */ |
| 2696 | |
| 2697 | static void |
| 2698 | step_into_function (struct execution_control_state *ecs) |
| 2699 | { |
| 2700 | struct symtab *s; |
| 2701 | struct symtab_and_line sr_sal; |
| 2702 | |
| 2703 | s = find_pc_symtab (stop_pc); |
| 2704 | if (s && s->language != language_asm) |
| 2705 | ecs->stop_func_start = gdbarch_skip_prologue |
| 2706 | (current_gdbarch, ecs->stop_func_start); |
| 2707 | |
| 2708 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); |
| 2709 | /* Use the step_resume_break to step until the end of the prologue, |
| 2710 | even if that involves jumps (as it seems to on the vax under |
| 2711 | 4.2). */ |
| 2712 | /* If the prologue ends in the middle of a source line, continue to |
| 2713 | the end of that source line (if it is still within the function). |
| 2714 | Otherwise, just go to end of prologue. */ |
| 2715 | if (ecs->sal.end |
| 2716 | && ecs->sal.pc != ecs->stop_func_start |
| 2717 | && ecs->sal.end < ecs->stop_func_end) |
| 2718 | ecs->stop_func_start = ecs->sal.end; |
| 2719 | |
| 2720 | /* Architectures which require breakpoint adjustment might not be able |
| 2721 | to place a breakpoint at the computed address. If so, the test |
| 2722 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust |
| 2723 | ecs->stop_func_start to an address at which a breakpoint may be |
| 2724 | legitimately placed. |
| 2725 | |
| 2726 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
| 2727 | made, GDB will enter an infinite loop when stepping through |
| 2728 | optimized code consisting of VLIW instructions which contain |
| 2729 | subinstructions corresponding to different source lines. On |
| 2730 | FR-V, it's not permitted to place a breakpoint on any but the |
| 2731 | first subinstruction of a VLIW instruction. When a breakpoint is |
| 2732 | set, GDB will adjust the breakpoint address to the beginning of |
| 2733 | the VLIW instruction. Thus, we need to make the corresponding |
| 2734 | adjustment here when computing the stop address. */ |
| 2735 | |
| 2736 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
| 2737 | { |
| 2738 | ecs->stop_func_start |
| 2739 | = gdbarch_adjust_breakpoint_address (current_gdbarch, |
| 2740 | ecs->stop_func_start); |
| 2741 | } |
| 2742 | |
| 2743 | if (ecs->stop_func_start == stop_pc) |
| 2744 | { |
| 2745 | /* We are already there: stop now. */ |
| 2746 | stop_step = 1; |
| 2747 | print_stop_reason (END_STEPPING_RANGE, 0); |
| 2748 | stop_stepping (ecs); |
| 2749 | return; |
| 2750 | } |
| 2751 | else |
| 2752 | { |
| 2753 | /* Put the step-breakpoint there and go until there. */ |
| 2754 | init_sal (&sr_sal); /* initialize to zeroes */ |
| 2755 | sr_sal.pc = ecs->stop_func_start; |
| 2756 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); |
| 2757 | |
| 2758 | /* Do not specify what the fp should be when we stop since on |
| 2759 | some machines the prologue is where the new fp value is |
| 2760 | established. */ |
| 2761 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
| 2762 | |
| 2763 | /* And make sure stepping stops right away then. */ |
| 2764 | step_range_end = step_range_start; |
| 2765 | } |
| 2766 | keep_going (ecs); |
| 2767 | } |
| 2768 | |
| 2769 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
| 2770 | This is used to both functions and to skip over code. */ |
| 2771 | |
| 2772 | static void |
| 2773 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
| 2774 | struct frame_id sr_id) |
| 2775 | { |
| 2776 | /* There should never be more than one step-resume breakpoint per |
| 2777 | thread, so we should never be setting a new |
| 2778 | step_resume_breakpoint when one is already active. */ |
| 2779 | gdb_assert (step_resume_breakpoint == NULL); |
| 2780 | |
| 2781 | if (debug_infrun) |
| 2782 | fprintf_unfiltered (gdb_stdlog, |
| 2783 | "infrun: inserting step-resume breakpoint at 0x%s\n", |
| 2784 | paddr_nz (sr_sal.pc)); |
| 2785 | |
| 2786 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, |
| 2787 | bp_step_resume); |
| 2788 | if (breakpoints_inserted) |
| 2789 | insert_breakpoints (); |
| 2790 | } |
| 2791 | |
| 2792 | /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used |
| 2793 | to skip a potential signal handler. |
| 2794 | |
| 2795 | This is called with the interrupted function's frame. The signal |
| 2796 | handler, when it returns, will resume the interrupted function at |
| 2797 | RETURN_FRAME.pc. */ |
| 2798 | |
| 2799 | static void |
| 2800 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
| 2801 | { |
| 2802 | struct symtab_and_line sr_sal; |
| 2803 | |
| 2804 | init_sal (&sr_sal); /* initialize to zeros */ |
| 2805 | |
| 2806 | sr_sal.pc = gdbarch_addr_bits_remove |
| 2807 | (current_gdbarch, get_frame_pc (return_frame)); |
| 2808 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
| 2809 | |
| 2810 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
| 2811 | } |
| 2812 | |
| 2813 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
| 2814 | but a breakpoint at the previous frame's PC. This is used to |
| 2815 | skip a function after stepping into it (for "next" or if the called |
| 2816 | function has no debugging information). |
| 2817 | |
| 2818 | The current function has almost always been reached by single |
| 2819 | stepping a call or return instruction. NEXT_FRAME belongs to the |
| 2820 | current function, and the breakpoint will be set at the caller's |
| 2821 | resume address. |
| 2822 | |
| 2823 | This is a separate function rather than reusing |
| 2824 | insert_step_resume_breakpoint_at_frame in order to avoid |
| 2825 | get_prev_frame, which may stop prematurely (see the implementation |
| 2826 | of frame_unwind_id for an example). */ |
| 2827 | |
| 2828 | static void |
| 2829 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) |
| 2830 | { |
| 2831 | struct symtab_and_line sr_sal; |
| 2832 | |
| 2833 | /* We shouldn't have gotten here if we don't know where the call site |
| 2834 | is. */ |
| 2835 | gdb_assert (frame_id_p (frame_unwind_id (next_frame))); |
| 2836 | |
| 2837 | init_sal (&sr_sal); /* initialize to zeros */ |
| 2838 | |
| 2839 | sr_sal.pc = gdbarch_addr_bits_remove |
| 2840 | (current_gdbarch, frame_pc_unwind (next_frame)); |
| 2841 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
| 2842 | |
| 2843 | insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame)); |
| 2844 | } |
| 2845 | |
| 2846 | static void |
| 2847 | stop_stepping (struct execution_control_state *ecs) |
| 2848 | { |
| 2849 | if (debug_infrun) |
| 2850 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
| 2851 | |
| 2852 | /* Let callers know we don't want to wait for the inferior anymore. */ |
| 2853 | ecs->wait_some_more = 0; |
| 2854 | } |
| 2855 | |
| 2856 | /* This function handles various cases where we need to continue |
| 2857 | waiting for the inferior. */ |
| 2858 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ |
| 2859 | |
| 2860 | static void |
| 2861 | keep_going (struct execution_control_state *ecs) |
| 2862 | { |
| 2863 | /* Save the pc before execution, to compare with pc after stop. */ |
| 2864 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
| 2865 | |
| 2866 | /* If we did not do break;, it means we should keep running the |
| 2867 | inferior and not return to debugger. */ |
| 2868 | |
| 2869 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) |
| 2870 | { |
| 2871 | /* We took a signal (which we are supposed to pass through to |
| 2872 | the inferior, else we'd have done a break above) and we |
| 2873 | haven't yet gotten our trap. Simply continue. */ |
| 2874 | resume (currently_stepping (ecs), stop_signal); |
| 2875 | } |
| 2876 | else |
| 2877 | { |
| 2878 | /* Either the trap was not expected, but we are continuing |
| 2879 | anyway (the user asked that this signal be passed to the |
| 2880 | child) |
| 2881 | -- or -- |
| 2882 | The signal was SIGTRAP, e.g. it was our signal, but we |
| 2883 | decided we should resume from it. |
| 2884 | |
| 2885 | We're going to run this baby now! */ |
| 2886 | |
| 2887 | if (!breakpoints_inserted && !ecs->another_trap) |
| 2888 | { |
| 2889 | /* Stop stepping when inserting breakpoints |
| 2890 | has failed. */ |
| 2891 | if (insert_breakpoints () != 0) |
| 2892 | { |
| 2893 | stop_stepping (ecs); |
| 2894 | return; |
| 2895 | } |
| 2896 | breakpoints_inserted = 1; |
| 2897 | } |
| 2898 | |
| 2899 | trap_expected = ecs->another_trap; |
| 2900 | |
| 2901 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly |
| 2902 | specifies that such a signal should be delivered to the |
| 2903 | target program). |
| 2904 | |
| 2905 | Typically, this would occure when a user is debugging a |
| 2906 | target monitor on a simulator: the target monitor sets a |
| 2907 | breakpoint; the simulator encounters this break-point and |
| 2908 | halts the simulation handing control to GDB; GDB, noteing |
| 2909 | that the break-point isn't valid, returns control back to the |
| 2910 | simulator; the simulator then delivers the hardware |
| 2911 | equivalent of a SIGNAL_TRAP to the program being debugged. */ |
| 2912 | |
| 2913 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) |
| 2914 | stop_signal = TARGET_SIGNAL_0; |
| 2915 | |
| 2916 | |
| 2917 | resume (currently_stepping (ecs), stop_signal); |
| 2918 | } |
| 2919 | |
| 2920 | prepare_to_wait (ecs); |
| 2921 | } |
| 2922 | |
| 2923 | /* This function normally comes after a resume, before |
| 2924 | handle_inferior_event exits. It takes care of any last bits of |
| 2925 | housekeeping, and sets the all-important wait_some_more flag. */ |
| 2926 | |
| 2927 | static void |
| 2928 | prepare_to_wait (struct execution_control_state *ecs) |
| 2929 | { |
| 2930 | if (debug_infrun) |
| 2931 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
| 2932 | if (ecs->infwait_state == infwait_normal_state) |
| 2933 | { |
| 2934 | overlay_cache_invalid = 1; |
| 2935 | |
| 2936 | /* We have to invalidate the registers BEFORE calling |
| 2937 | target_wait because they can be loaded from the target while |
| 2938 | in target_wait. This makes remote debugging a bit more |
| 2939 | efficient for those targets that provide critical registers |
| 2940 | as part of their normal status mechanism. */ |
| 2941 | |
| 2942 | registers_changed (); |
| 2943 | ecs->waiton_ptid = pid_to_ptid (-1); |
| 2944 | ecs->wp = &(ecs->ws); |
| 2945 | } |
| 2946 | /* This is the old end of the while loop. Let everybody know we |
| 2947 | want to wait for the inferior some more and get called again |
| 2948 | soon. */ |
| 2949 | ecs->wait_some_more = 1; |
| 2950 | } |
| 2951 | |
| 2952 | /* Print why the inferior has stopped. We always print something when |
| 2953 | the inferior exits, or receives a signal. The rest of the cases are |
| 2954 | dealt with later on in normal_stop() and print_it_typical(). Ideally |
| 2955 | there should be a call to this function from handle_inferior_event() |
| 2956 | each time stop_stepping() is called.*/ |
| 2957 | static void |
| 2958 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) |
| 2959 | { |
| 2960 | switch (stop_reason) |
| 2961 | { |
| 2962 | case END_STEPPING_RANGE: |
| 2963 | /* We are done with a step/next/si/ni command. */ |
| 2964 | /* For now print nothing. */ |
| 2965 | /* Print a message only if not in the middle of doing a "step n" |
| 2966 | operation for n > 1 */ |
| 2967 | if (!step_multi || !stop_step) |
| 2968 | if (ui_out_is_mi_like_p (uiout)) |
| 2969 | ui_out_field_string |
| 2970 | (uiout, "reason", |
| 2971 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
| 2972 | break; |
| 2973 | case SIGNAL_EXITED: |
| 2974 | /* The inferior was terminated by a signal. */ |
| 2975 | annotate_signalled (); |
| 2976 | if (ui_out_is_mi_like_p (uiout)) |
| 2977 | ui_out_field_string |
| 2978 | (uiout, "reason", |
| 2979 | async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); |
| 2980 | ui_out_text (uiout, "\nProgram terminated with signal "); |
| 2981 | annotate_signal_name (); |
| 2982 | ui_out_field_string (uiout, "signal-name", |
| 2983 | target_signal_to_name (stop_info)); |
| 2984 | annotate_signal_name_end (); |
| 2985 | ui_out_text (uiout, ", "); |
| 2986 | annotate_signal_string (); |
| 2987 | ui_out_field_string (uiout, "signal-meaning", |
| 2988 | target_signal_to_string (stop_info)); |
| 2989 | annotate_signal_string_end (); |
| 2990 | ui_out_text (uiout, ".\n"); |
| 2991 | ui_out_text (uiout, "The program no longer exists.\n"); |
| 2992 | break; |
| 2993 | case EXITED: |
| 2994 | /* The inferior program is finished. */ |
| 2995 | annotate_exited (stop_info); |
| 2996 | if (stop_info) |
| 2997 | { |
| 2998 | if (ui_out_is_mi_like_p (uiout)) |
| 2999 | ui_out_field_string (uiout, "reason", |
| 3000 | async_reason_lookup (EXEC_ASYNC_EXITED)); |
| 3001 | ui_out_text (uiout, "\nProgram exited with code "); |
| 3002 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
| 3003 | (unsigned int) stop_info); |
| 3004 | ui_out_text (uiout, ".\n"); |
| 3005 | } |
| 3006 | else |
| 3007 | { |
| 3008 | if (ui_out_is_mi_like_p (uiout)) |
| 3009 | ui_out_field_string |
| 3010 | (uiout, "reason", |
| 3011 | async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
| 3012 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
| 3013 | } |
| 3014 | /* Support the --return-child-result option. */ |
| 3015 | return_child_result_value = stop_info; |
| 3016 | break; |
| 3017 | case SIGNAL_RECEIVED: |
| 3018 | /* Signal received. The signal table tells us to print about |
| 3019 | it. */ |
| 3020 | annotate_signal (); |
| 3021 | ui_out_text (uiout, "\nProgram received signal "); |
| 3022 | annotate_signal_name (); |
| 3023 | if (ui_out_is_mi_like_p (uiout)) |
| 3024 | ui_out_field_string |
| 3025 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); |
| 3026 | ui_out_field_string (uiout, "signal-name", |
| 3027 | target_signal_to_name (stop_info)); |
| 3028 | annotate_signal_name_end (); |
| 3029 | ui_out_text (uiout, ", "); |
| 3030 | annotate_signal_string (); |
| 3031 | ui_out_field_string (uiout, "signal-meaning", |
| 3032 | target_signal_to_string (stop_info)); |
| 3033 | annotate_signal_string_end (); |
| 3034 | ui_out_text (uiout, ".\n"); |
| 3035 | break; |
| 3036 | default: |
| 3037 | internal_error (__FILE__, __LINE__, |
| 3038 | _("print_stop_reason: unrecognized enum value")); |
| 3039 | break; |
| 3040 | } |
| 3041 | } |
| 3042 | \f |
| 3043 | |
| 3044 | /* Here to return control to GDB when the inferior stops for real. |
| 3045 | Print appropriate messages, remove breakpoints, give terminal our modes. |
| 3046 | |
| 3047 | STOP_PRINT_FRAME nonzero means print the executing frame |
| 3048 | (pc, function, args, file, line number and line text). |
| 3049 | BREAKPOINTS_FAILED nonzero means stop was due to error |
| 3050 | attempting to insert breakpoints. */ |
| 3051 | |
| 3052 | void |
| 3053 | normal_stop (void) |
| 3054 | { |
| 3055 | struct target_waitstatus last; |
| 3056 | ptid_t last_ptid; |
| 3057 | |
| 3058 | get_last_target_status (&last_ptid, &last); |
| 3059 | |
| 3060 | /* As with the notification of thread events, we want to delay |
| 3061 | notifying the user that we've switched thread context until |
| 3062 | the inferior actually stops. |
| 3063 | |
| 3064 | There's no point in saying anything if the inferior has exited. |
| 3065 | Note that SIGNALLED here means "exited with a signal", not |
| 3066 | "received a signal". */ |
| 3067 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
| 3068 | && target_has_execution |
| 3069 | && last.kind != TARGET_WAITKIND_SIGNALLED |
| 3070 | && last.kind != TARGET_WAITKIND_EXITED) |
| 3071 | { |
| 3072 | target_terminal_ours_for_output (); |
| 3073 | printf_filtered (_("[Switching to %s]\n"), |
| 3074 | target_pid_or_tid_to_str (inferior_ptid)); |
| 3075 | previous_inferior_ptid = inferior_ptid; |
| 3076 | } |
| 3077 | |
| 3078 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
| 3079 | /* Make sure that the current_frame's pc is correct. This |
| 3080 | is a correction for setting up the frame info before doing |
| 3081 | gdbarch_decr_pc_after_break */ |
| 3082 | if (target_has_execution) |
| 3083 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to |
| 3084 | gdbarch_decr_pc_after_break, the program counter can change. Ask the |
| 3085 | frame code to check for this and sort out any resultant mess. |
| 3086 | gdbarch_decr_pc_after_break needs to just go away. */ |
| 3087 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
| 3088 | |
| 3089 | if (target_has_execution && breakpoints_inserted) |
| 3090 | { |
| 3091 | if (remove_breakpoints ()) |
| 3092 | { |
| 3093 | target_terminal_ours_for_output (); |
| 3094 | printf_filtered (_("\ |
| 3095 | Cannot remove breakpoints because program is no longer writable.\n\ |
| 3096 | It might be running in another process.\n\ |
| 3097 | Further execution is probably impossible.\n")); |
| 3098 | } |
| 3099 | } |
| 3100 | breakpoints_inserted = 0; |
| 3101 | |
| 3102 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
| 3103 | Delete any breakpoint that is to be deleted at the next stop. */ |
| 3104 | |
| 3105 | breakpoint_auto_delete (stop_bpstat); |
| 3106 | |
| 3107 | /* If an auto-display called a function and that got a signal, |
| 3108 | delete that auto-display to avoid an infinite recursion. */ |
| 3109 | |
| 3110 | if (stopped_by_random_signal) |
| 3111 | disable_current_display (); |
| 3112 | |
| 3113 | /* Don't print a message if in the middle of doing a "step n" |
| 3114 | operation for n > 1 */ |
| 3115 | if (step_multi && stop_step) |
| 3116 | goto done; |
| 3117 | |
| 3118 | target_terminal_ours (); |
| 3119 | |
| 3120 | /* Set the current source location. This will also happen if we |
| 3121 | display the frame below, but the current SAL will be incorrect |
| 3122 | during a user hook-stop function. */ |
| 3123 | if (target_has_stack && !stop_stack_dummy) |
| 3124 | set_current_sal_from_frame (get_current_frame (), 1); |
| 3125 | |
| 3126 | /* Look up the hook_stop and run it (CLI internally handles problem |
| 3127 | of stop_command's pre-hook not existing). */ |
| 3128 | if (stop_command) |
| 3129 | catch_errors (hook_stop_stub, stop_command, |
| 3130 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
| 3131 | |
| 3132 | if (!target_has_stack) |
| 3133 | { |
| 3134 | |
| 3135 | goto done; |
| 3136 | } |
| 3137 | |
| 3138 | /* Select innermost stack frame - i.e., current frame is frame 0, |
| 3139 | and current location is based on that. |
| 3140 | Don't do this on return from a stack dummy routine, |
| 3141 | or if the program has exited. */ |
| 3142 | |
| 3143 | if (!stop_stack_dummy) |
| 3144 | { |
| 3145 | select_frame (get_current_frame ()); |
| 3146 | |
| 3147 | /* Print current location without a level number, if |
| 3148 | we have changed functions or hit a breakpoint. |
| 3149 | Print source line if we have one. |
| 3150 | bpstat_print() contains the logic deciding in detail |
| 3151 | what to print, based on the event(s) that just occurred. */ |
| 3152 | |
| 3153 | if (stop_print_frame) |
| 3154 | { |
| 3155 | int bpstat_ret; |
| 3156 | int source_flag; |
| 3157 | int do_frame_printing = 1; |
| 3158 | |
| 3159 | bpstat_ret = bpstat_print (stop_bpstat); |
| 3160 | switch (bpstat_ret) |
| 3161 | { |
| 3162 | case PRINT_UNKNOWN: |
| 3163 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
| 3164 | (or should) carry around the function and does (or |
| 3165 | should) use that when doing a frame comparison. */ |
| 3166 | if (stop_step |
| 3167 | && frame_id_eq (step_frame_id, |
| 3168 | get_frame_id (get_current_frame ())) |
| 3169 | && step_start_function == find_pc_function (stop_pc)) |
| 3170 | source_flag = SRC_LINE; /* finished step, just print source line */ |
| 3171 | else |
| 3172 | source_flag = SRC_AND_LOC; /* print location and source line */ |
| 3173 | break; |
| 3174 | case PRINT_SRC_AND_LOC: |
| 3175 | source_flag = SRC_AND_LOC; /* print location and source line */ |
| 3176 | break; |
| 3177 | case PRINT_SRC_ONLY: |
| 3178 | source_flag = SRC_LINE; |
| 3179 | break; |
| 3180 | case PRINT_NOTHING: |
| 3181 | source_flag = SRC_LINE; /* something bogus */ |
| 3182 | do_frame_printing = 0; |
| 3183 | break; |
| 3184 | default: |
| 3185 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
| 3186 | } |
| 3187 | |
| 3188 | if (ui_out_is_mi_like_p (uiout)) |
| 3189 | ui_out_field_int (uiout, "thread-id", |
| 3190 | pid_to_thread_id (inferior_ptid)); |
| 3191 | /* The behavior of this routine with respect to the source |
| 3192 | flag is: |
| 3193 | SRC_LINE: Print only source line |
| 3194 | LOCATION: Print only location |
| 3195 | SRC_AND_LOC: Print location and source line */ |
| 3196 | if (do_frame_printing) |
| 3197 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
| 3198 | |
| 3199 | /* Display the auto-display expressions. */ |
| 3200 | do_displays (); |
| 3201 | } |
| 3202 | } |
| 3203 | |
| 3204 | /* Save the function value return registers, if we care. |
| 3205 | We might be about to restore their previous contents. */ |
| 3206 | if (proceed_to_finish) |
| 3207 | { |
| 3208 | /* This should not be necessary. */ |
| 3209 | if (stop_registers) |
| 3210 | regcache_xfree (stop_registers); |
| 3211 | |
| 3212 | /* NB: The copy goes through to the target picking up the value of |
| 3213 | all the registers. */ |
| 3214 | stop_registers = regcache_dup (get_current_regcache ()); |
| 3215 | } |
| 3216 | |
| 3217 | if (stop_stack_dummy) |
| 3218 | { |
| 3219 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
| 3220 | ends with a setting of the current frame, so we can use that |
| 3221 | next. */ |
| 3222 | frame_pop (get_current_frame ()); |
| 3223 | /* Set stop_pc to what it was before we called the function. |
| 3224 | Can't rely on restore_inferior_status because that only gets |
| 3225 | called if we don't stop in the called function. */ |
| 3226 | stop_pc = read_pc (); |
| 3227 | select_frame (get_current_frame ()); |
| 3228 | } |
| 3229 | |
| 3230 | done: |
| 3231 | annotate_stopped (); |
| 3232 | observer_notify_normal_stop (stop_bpstat); |
| 3233 | } |
| 3234 | |
| 3235 | static int |
| 3236 | hook_stop_stub (void *cmd) |
| 3237 | { |
| 3238 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
| 3239 | return (0); |
| 3240 | } |
| 3241 | \f |
| 3242 | int |
| 3243 | signal_stop_state (int signo) |
| 3244 | { |
| 3245 | return signal_stop[signo]; |
| 3246 | } |
| 3247 | |
| 3248 | int |
| 3249 | signal_print_state (int signo) |
| 3250 | { |
| 3251 | return signal_print[signo]; |
| 3252 | } |
| 3253 | |
| 3254 | int |
| 3255 | signal_pass_state (int signo) |
| 3256 | { |
| 3257 | return signal_program[signo]; |
| 3258 | } |
| 3259 | |
| 3260 | int |
| 3261 | signal_stop_update (int signo, int state) |
| 3262 | { |
| 3263 | int ret = signal_stop[signo]; |
| 3264 | signal_stop[signo] = state; |
| 3265 | return ret; |
| 3266 | } |
| 3267 | |
| 3268 | int |
| 3269 | signal_print_update (int signo, int state) |
| 3270 | { |
| 3271 | int ret = signal_print[signo]; |
| 3272 | signal_print[signo] = state; |
| 3273 | return ret; |
| 3274 | } |
| 3275 | |
| 3276 | int |
| 3277 | signal_pass_update (int signo, int state) |
| 3278 | { |
| 3279 | int ret = signal_program[signo]; |
| 3280 | signal_program[signo] = state; |
| 3281 | return ret; |
| 3282 | } |
| 3283 | |
| 3284 | static void |
| 3285 | sig_print_header (void) |
| 3286 | { |
| 3287 | printf_filtered (_("\ |
| 3288 | Signal Stop\tPrint\tPass to program\tDescription\n")); |
| 3289 | } |
| 3290 | |
| 3291 | static void |
| 3292 | sig_print_info (enum target_signal oursig) |
| 3293 | { |
| 3294 | char *name = target_signal_to_name (oursig); |
| 3295 | int name_padding = 13 - strlen (name); |
| 3296 | |
| 3297 | if (name_padding <= 0) |
| 3298 | name_padding = 0; |
| 3299 | |
| 3300 | printf_filtered ("%s", name); |
| 3301 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
| 3302 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
| 3303 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); |
| 3304 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); |
| 3305 | printf_filtered ("%s\n", target_signal_to_string (oursig)); |
| 3306 | } |
| 3307 | |
| 3308 | /* Specify how various signals in the inferior should be handled. */ |
| 3309 | |
| 3310 | static void |
| 3311 | handle_command (char *args, int from_tty) |
| 3312 | { |
| 3313 | char **argv; |
| 3314 | int digits, wordlen; |
| 3315 | int sigfirst, signum, siglast; |
| 3316 | enum target_signal oursig; |
| 3317 | int allsigs; |
| 3318 | int nsigs; |
| 3319 | unsigned char *sigs; |
| 3320 | struct cleanup *old_chain; |
| 3321 | |
| 3322 | if (args == NULL) |
| 3323 | { |
| 3324 | error_no_arg (_("signal to handle")); |
| 3325 | } |
| 3326 | |
| 3327 | /* Allocate and zero an array of flags for which signals to handle. */ |
| 3328 | |
| 3329 | nsigs = (int) TARGET_SIGNAL_LAST; |
| 3330 | sigs = (unsigned char *) alloca (nsigs); |
| 3331 | memset (sigs, 0, nsigs); |
| 3332 | |
| 3333 | /* Break the command line up into args. */ |
| 3334 | |
| 3335 | argv = buildargv (args); |
| 3336 | if (argv == NULL) |
| 3337 | { |
| 3338 | nomem (0); |
| 3339 | } |
| 3340 | old_chain = make_cleanup_freeargv (argv); |
| 3341 | |
| 3342 | /* Walk through the args, looking for signal oursigs, signal names, and |
| 3343 | actions. Signal numbers and signal names may be interspersed with |
| 3344 | actions, with the actions being performed for all signals cumulatively |
| 3345 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
| 3346 | |
| 3347 | while (*argv != NULL) |
| 3348 | { |
| 3349 | wordlen = strlen (*argv); |
| 3350 | for (digits = 0; isdigit ((*argv)[digits]); digits++) |
| 3351 | {; |
| 3352 | } |
| 3353 | allsigs = 0; |
| 3354 | sigfirst = siglast = -1; |
| 3355 | |
| 3356 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) |
| 3357 | { |
| 3358 | /* Apply action to all signals except those used by the |
| 3359 | debugger. Silently skip those. */ |
| 3360 | allsigs = 1; |
| 3361 | sigfirst = 0; |
| 3362 | siglast = nsigs - 1; |
| 3363 | } |
| 3364 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) |
| 3365 | { |
| 3366 | SET_SIGS (nsigs, sigs, signal_stop); |
| 3367 | SET_SIGS (nsigs, sigs, signal_print); |
| 3368 | } |
| 3369 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) |
| 3370 | { |
| 3371 | UNSET_SIGS (nsigs, sigs, signal_program); |
| 3372 | } |
| 3373 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) |
| 3374 | { |
| 3375 | SET_SIGS (nsigs, sigs, signal_print); |
| 3376 | } |
| 3377 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) |
| 3378 | { |
| 3379 | SET_SIGS (nsigs, sigs, signal_program); |
| 3380 | } |
| 3381 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) |
| 3382 | { |
| 3383 | UNSET_SIGS (nsigs, sigs, signal_stop); |
| 3384 | } |
| 3385 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) |
| 3386 | { |
| 3387 | SET_SIGS (nsigs, sigs, signal_program); |
| 3388 | } |
| 3389 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) |
| 3390 | { |
| 3391 | UNSET_SIGS (nsigs, sigs, signal_print); |
| 3392 | UNSET_SIGS (nsigs, sigs, signal_stop); |
| 3393 | } |
| 3394 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) |
| 3395 | { |
| 3396 | UNSET_SIGS (nsigs, sigs, signal_program); |
| 3397 | } |
| 3398 | else if (digits > 0) |
| 3399 | { |
| 3400 | /* It is numeric. The numeric signal refers to our own |
| 3401 | internal signal numbering from target.h, not to host/target |
| 3402 | signal number. This is a feature; users really should be |
| 3403 | using symbolic names anyway, and the common ones like |
| 3404 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ |
| 3405 | |
| 3406 | sigfirst = siglast = (int) |
| 3407 | target_signal_from_command (atoi (*argv)); |
| 3408 | if ((*argv)[digits] == '-') |
| 3409 | { |
| 3410 | siglast = (int) |
| 3411 | target_signal_from_command (atoi ((*argv) + digits + 1)); |
| 3412 | } |
| 3413 | if (sigfirst > siglast) |
| 3414 | { |
| 3415 | /* Bet he didn't figure we'd think of this case... */ |
| 3416 | signum = sigfirst; |
| 3417 | sigfirst = siglast; |
| 3418 | siglast = signum; |
| 3419 | } |
| 3420 | } |
| 3421 | else |
| 3422 | { |
| 3423 | oursig = target_signal_from_name (*argv); |
| 3424 | if (oursig != TARGET_SIGNAL_UNKNOWN) |
| 3425 | { |
| 3426 | sigfirst = siglast = (int) oursig; |
| 3427 | } |
| 3428 | else |
| 3429 | { |
| 3430 | /* Not a number and not a recognized flag word => complain. */ |
| 3431 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
| 3432 | } |
| 3433 | } |
| 3434 | |
| 3435 | /* If any signal numbers or symbol names were found, set flags for |
| 3436 | which signals to apply actions to. */ |
| 3437 | |
| 3438 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
| 3439 | { |
| 3440 | switch ((enum target_signal) signum) |
| 3441 | { |
| 3442 | case TARGET_SIGNAL_TRAP: |
| 3443 | case TARGET_SIGNAL_INT: |
| 3444 | if (!allsigs && !sigs[signum]) |
| 3445 | { |
| 3446 | if (query ("%s is used by the debugger.\n\ |
| 3447 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
| 3448 | { |
| 3449 | sigs[signum] = 1; |
| 3450 | } |
| 3451 | else |
| 3452 | { |
| 3453 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
| 3454 | gdb_flush (gdb_stdout); |
| 3455 | } |
| 3456 | } |
| 3457 | break; |
| 3458 | case TARGET_SIGNAL_0: |
| 3459 | case TARGET_SIGNAL_DEFAULT: |
| 3460 | case TARGET_SIGNAL_UNKNOWN: |
| 3461 | /* Make sure that "all" doesn't print these. */ |
| 3462 | break; |
| 3463 | default: |
| 3464 | sigs[signum] = 1; |
| 3465 | break; |
| 3466 | } |
| 3467 | } |
| 3468 | |
| 3469 | argv++; |
| 3470 | } |
| 3471 | |
| 3472 | target_notice_signals (inferior_ptid); |
| 3473 | |
| 3474 | if (from_tty) |
| 3475 | { |
| 3476 | /* Show the results. */ |
| 3477 | sig_print_header (); |
| 3478 | for (signum = 0; signum < nsigs; signum++) |
| 3479 | { |
| 3480 | if (sigs[signum]) |
| 3481 | { |
| 3482 | sig_print_info (signum); |
| 3483 | } |
| 3484 | } |
| 3485 | } |
| 3486 | |
| 3487 | do_cleanups (old_chain); |
| 3488 | } |
| 3489 | |
| 3490 | static void |
| 3491 | xdb_handle_command (char *args, int from_tty) |
| 3492 | { |
| 3493 | char **argv; |
| 3494 | struct cleanup *old_chain; |
| 3495 | |
| 3496 | /* Break the command line up into args. */ |
| 3497 | |
| 3498 | argv = buildargv (args); |
| 3499 | if (argv == NULL) |
| 3500 | { |
| 3501 | nomem (0); |
| 3502 | } |
| 3503 | old_chain = make_cleanup_freeargv (argv); |
| 3504 | if (argv[1] != (char *) NULL) |
| 3505 | { |
| 3506 | char *argBuf; |
| 3507 | int bufLen; |
| 3508 | |
| 3509 | bufLen = strlen (argv[0]) + 20; |
| 3510 | argBuf = (char *) xmalloc (bufLen); |
| 3511 | if (argBuf) |
| 3512 | { |
| 3513 | int validFlag = 1; |
| 3514 | enum target_signal oursig; |
| 3515 | |
| 3516 | oursig = target_signal_from_name (argv[0]); |
| 3517 | memset (argBuf, 0, bufLen); |
| 3518 | if (strcmp (argv[1], "Q") == 0) |
| 3519 | sprintf (argBuf, "%s %s", argv[0], "noprint"); |
| 3520 | else |
| 3521 | { |
| 3522 | if (strcmp (argv[1], "s") == 0) |
| 3523 | { |
| 3524 | if (!signal_stop[oursig]) |
| 3525 | sprintf (argBuf, "%s %s", argv[0], "stop"); |
| 3526 | else |
| 3527 | sprintf (argBuf, "%s %s", argv[0], "nostop"); |
| 3528 | } |
| 3529 | else if (strcmp (argv[1], "i") == 0) |
| 3530 | { |
| 3531 | if (!signal_program[oursig]) |
| 3532 | sprintf (argBuf, "%s %s", argv[0], "pass"); |
| 3533 | else |
| 3534 | sprintf (argBuf, "%s %s", argv[0], "nopass"); |
| 3535 | } |
| 3536 | else if (strcmp (argv[1], "r") == 0) |
| 3537 | { |
| 3538 | if (!signal_print[oursig]) |
| 3539 | sprintf (argBuf, "%s %s", argv[0], "print"); |
| 3540 | else |
| 3541 | sprintf (argBuf, "%s %s", argv[0], "noprint"); |
| 3542 | } |
| 3543 | else |
| 3544 | validFlag = 0; |
| 3545 | } |
| 3546 | if (validFlag) |
| 3547 | handle_command (argBuf, from_tty); |
| 3548 | else |
| 3549 | printf_filtered (_("Invalid signal handling flag.\n")); |
| 3550 | if (argBuf) |
| 3551 | xfree (argBuf); |
| 3552 | } |
| 3553 | } |
| 3554 | do_cleanups (old_chain); |
| 3555 | } |
| 3556 | |
| 3557 | /* Print current contents of the tables set by the handle command. |
| 3558 | It is possible we should just be printing signals actually used |
| 3559 | by the current target (but for things to work right when switching |
| 3560 | targets, all signals should be in the signal tables). */ |
| 3561 | |
| 3562 | static void |
| 3563 | signals_info (char *signum_exp, int from_tty) |
| 3564 | { |
| 3565 | enum target_signal oursig; |
| 3566 | sig_print_header (); |
| 3567 | |
| 3568 | if (signum_exp) |
| 3569 | { |
| 3570 | /* First see if this is a symbol name. */ |
| 3571 | oursig = target_signal_from_name (signum_exp); |
| 3572 | if (oursig == TARGET_SIGNAL_UNKNOWN) |
| 3573 | { |
| 3574 | /* No, try numeric. */ |
| 3575 | oursig = |
| 3576 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
| 3577 | } |
| 3578 | sig_print_info (oursig); |
| 3579 | return; |
| 3580 | } |
| 3581 | |
| 3582 | printf_filtered ("\n"); |
| 3583 | /* These ugly casts brought to you by the native VAX compiler. */ |
| 3584 | for (oursig = TARGET_SIGNAL_FIRST; |
| 3585 | (int) oursig < (int) TARGET_SIGNAL_LAST; |
| 3586 | oursig = (enum target_signal) ((int) oursig + 1)) |
| 3587 | { |
| 3588 | QUIT; |
| 3589 | |
| 3590 | if (oursig != TARGET_SIGNAL_UNKNOWN |
| 3591 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
| 3592 | sig_print_info (oursig); |
| 3593 | } |
| 3594 | |
| 3595 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
| 3596 | } |
| 3597 | \f |
| 3598 | struct inferior_status |
| 3599 | { |
| 3600 | enum target_signal stop_signal; |
| 3601 | CORE_ADDR stop_pc; |
| 3602 | bpstat stop_bpstat; |
| 3603 | int stop_step; |
| 3604 | int stop_stack_dummy; |
| 3605 | int stopped_by_random_signal; |
| 3606 | int trap_expected; |
| 3607 | CORE_ADDR step_range_start; |
| 3608 | CORE_ADDR step_range_end; |
| 3609 | struct frame_id step_frame_id; |
| 3610 | enum step_over_calls_kind step_over_calls; |
| 3611 | CORE_ADDR step_resume_break_address; |
| 3612 | int stop_after_trap; |
| 3613 | int stop_soon; |
| 3614 | |
| 3615 | /* These are here because if call_function_by_hand has written some |
| 3616 | registers and then decides to call error(), we better not have changed |
| 3617 | any registers. */ |
| 3618 | struct regcache *registers; |
| 3619 | |
| 3620 | /* A frame unique identifier. */ |
| 3621 | struct frame_id selected_frame_id; |
| 3622 | |
| 3623 | int breakpoint_proceeded; |
| 3624 | int restore_stack_info; |
| 3625 | int proceed_to_finish; |
| 3626 | }; |
| 3627 | |
| 3628 | void |
| 3629 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
| 3630 | LONGEST val) |
| 3631 | { |
| 3632 | int size = register_size (current_gdbarch, regno); |
| 3633 | void *buf = alloca (size); |
| 3634 | store_signed_integer (buf, size, val); |
| 3635 | regcache_raw_write (inf_status->registers, regno, buf); |
| 3636 | } |
| 3637 | |
| 3638 | /* Save all of the information associated with the inferior<==>gdb |
| 3639 | connection. INF_STATUS is a pointer to a "struct inferior_status" |
| 3640 | (defined in inferior.h). */ |
| 3641 | |
| 3642 | struct inferior_status * |
| 3643 | save_inferior_status (int restore_stack_info) |
| 3644 | { |
| 3645 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
| 3646 | |
| 3647 | inf_status->stop_signal = stop_signal; |
| 3648 | inf_status->stop_pc = stop_pc; |
| 3649 | inf_status->stop_step = stop_step; |
| 3650 | inf_status->stop_stack_dummy = stop_stack_dummy; |
| 3651 | inf_status->stopped_by_random_signal = stopped_by_random_signal; |
| 3652 | inf_status->trap_expected = trap_expected; |
| 3653 | inf_status->step_range_start = step_range_start; |
| 3654 | inf_status->step_range_end = step_range_end; |
| 3655 | inf_status->step_frame_id = step_frame_id; |
| 3656 | inf_status->step_over_calls = step_over_calls; |
| 3657 | inf_status->stop_after_trap = stop_after_trap; |
| 3658 | inf_status->stop_soon = stop_soon; |
| 3659 | /* Save original bpstat chain here; replace it with copy of chain. |
| 3660 | If caller's caller is walking the chain, they'll be happier if we |
| 3661 | hand them back the original chain when restore_inferior_status is |
| 3662 | called. */ |
| 3663 | inf_status->stop_bpstat = stop_bpstat; |
| 3664 | stop_bpstat = bpstat_copy (stop_bpstat); |
| 3665 | inf_status->breakpoint_proceeded = breakpoint_proceeded; |
| 3666 | inf_status->restore_stack_info = restore_stack_info; |
| 3667 | inf_status->proceed_to_finish = proceed_to_finish; |
| 3668 | |
| 3669 | inf_status->registers = regcache_dup (get_current_regcache ()); |
| 3670 | |
| 3671 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
| 3672 | return inf_status; |
| 3673 | } |
| 3674 | |
| 3675 | static int |
| 3676 | restore_selected_frame (void *args) |
| 3677 | { |
| 3678 | struct frame_id *fid = (struct frame_id *) args; |
| 3679 | struct frame_info *frame; |
| 3680 | |
| 3681 | frame = frame_find_by_id (*fid); |
| 3682 | |
| 3683 | /* If inf_status->selected_frame_id is NULL, there was no previously |
| 3684 | selected frame. */ |
| 3685 | if (frame == NULL) |
| 3686 | { |
| 3687 | warning (_("Unable to restore previously selected frame.")); |
| 3688 | return 0; |
| 3689 | } |
| 3690 | |
| 3691 | select_frame (frame); |
| 3692 | |
| 3693 | return (1); |
| 3694 | } |
| 3695 | |
| 3696 | void |
| 3697 | restore_inferior_status (struct inferior_status *inf_status) |
| 3698 | { |
| 3699 | stop_signal = inf_status->stop_signal; |
| 3700 | stop_pc = inf_status->stop_pc; |
| 3701 | stop_step = inf_status->stop_step; |
| 3702 | stop_stack_dummy = inf_status->stop_stack_dummy; |
| 3703 | stopped_by_random_signal = inf_status->stopped_by_random_signal; |
| 3704 | trap_expected = inf_status->trap_expected; |
| 3705 | step_range_start = inf_status->step_range_start; |
| 3706 | step_range_end = inf_status->step_range_end; |
| 3707 | step_frame_id = inf_status->step_frame_id; |
| 3708 | step_over_calls = inf_status->step_over_calls; |
| 3709 | stop_after_trap = inf_status->stop_after_trap; |
| 3710 | stop_soon = inf_status->stop_soon; |
| 3711 | bpstat_clear (&stop_bpstat); |
| 3712 | stop_bpstat = inf_status->stop_bpstat; |
| 3713 | breakpoint_proceeded = inf_status->breakpoint_proceeded; |
| 3714 | proceed_to_finish = inf_status->proceed_to_finish; |
| 3715 | |
| 3716 | /* The inferior can be gone if the user types "print exit(0)" |
| 3717 | (and perhaps other times). */ |
| 3718 | if (target_has_execution) |
| 3719 | /* NB: The register write goes through to the target. */ |
| 3720 | regcache_cpy (get_current_regcache (), inf_status->registers); |
| 3721 | regcache_xfree (inf_status->registers); |
| 3722 | |
| 3723 | /* FIXME: If we are being called after stopping in a function which |
| 3724 | is called from gdb, we should not be trying to restore the |
| 3725 | selected frame; it just prints a spurious error message (The |
| 3726 | message is useful, however, in detecting bugs in gdb (like if gdb |
| 3727 | clobbers the stack)). In fact, should we be restoring the |
| 3728 | inferior status at all in that case? . */ |
| 3729 | |
| 3730 | if (target_has_stack && inf_status->restore_stack_info) |
| 3731 | { |
| 3732 | /* The point of catch_errors is that if the stack is clobbered, |
| 3733 | walking the stack might encounter a garbage pointer and |
| 3734 | error() trying to dereference it. */ |
| 3735 | if (catch_errors |
| 3736 | (restore_selected_frame, &inf_status->selected_frame_id, |
| 3737 | "Unable to restore previously selected frame:\n", |
| 3738 | RETURN_MASK_ERROR) == 0) |
| 3739 | /* Error in restoring the selected frame. Select the innermost |
| 3740 | frame. */ |
| 3741 | select_frame (get_current_frame ()); |
| 3742 | |
| 3743 | } |
| 3744 | |
| 3745 | xfree (inf_status); |
| 3746 | } |
| 3747 | |
| 3748 | static void |
| 3749 | do_restore_inferior_status_cleanup (void *sts) |
| 3750 | { |
| 3751 | restore_inferior_status (sts); |
| 3752 | } |
| 3753 | |
| 3754 | struct cleanup * |
| 3755 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) |
| 3756 | { |
| 3757 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); |
| 3758 | } |
| 3759 | |
| 3760 | void |
| 3761 | discard_inferior_status (struct inferior_status *inf_status) |
| 3762 | { |
| 3763 | /* See save_inferior_status for info on stop_bpstat. */ |
| 3764 | bpstat_clear (&inf_status->stop_bpstat); |
| 3765 | regcache_xfree (inf_status->registers); |
| 3766 | xfree (inf_status); |
| 3767 | } |
| 3768 | |
| 3769 | int |
| 3770 | inferior_has_forked (int pid, int *child_pid) |
| 3771 | { |
| 3772 | struct target_waitstatus last; |
| 3773 | ptid_t last_ptid; |
| 3774 | |
| 3775 | get_last_target_status (&last_ptid, &last); |
| 3776 | |
| 3777 | if (last.kind != TARGET_WAITKIND_FORKED) |
| 3778 | return 0; |
| 3779 | |
| 3780 | if (ptid_get_pid (last_ptid) != pid) |
| 3781 | return 0; |
| 3782 | |
| 3783 | *child_pid = last.value.related_pid; |
| 3784 | return 1; |
| 3785 | } |
| 3786 | |
| 3787 | int |
| 3788 | inferior_has_vforked (int pid, int *child_pid) |
| 3789 | { |
| 3790 | struct target_waitstatus last; |
| 3791 | ptid_t last_ptid; |
| 3792 | |
| 3793 | get_last_target_status (&last_ptid, &last); |
| 3794 | |
| 3795 | if (last.kind != TARGET_WAITKIND_VFORKED) |
| 3796 | return 0; |
| 3797 | |
| 3798 | if (ptid_get_pid (last_ptid) != pid) |
| 3799 | return 0; |
| 3800 | |
| 3801 | *child_pid = last.value.related_pid; |
| 3802 | return 1; |
| 3803 | } |
| 3804 | |
| 3805 | int |
| 3806 | inferior_has_execd (int pid, char **execd_pathname) |
| 3807 | { |
| 3808 | struct target_waitstatus last; |
| 3809 | ptid_t last_ptid; |
| 3810 | |
| 3811 | get_last_target_status (&last_ptid, &last); |
| 3812 | |
| 3813 | if (last.kind != TARGET_WAITKIND_EXECD) |
| 3814 | return 0; |
| 3815 | |
| 3816 | if (ptid_get_pid (last_ptid) != pid) |
| 3817 | return 0; |
| 3818 | |
| 3819 | *execd_pathname = xstrdup (last.value.execd_pathname); |
| 3820 | return 1; |
| 3821 | } |
| 3822 | |
| 3823 | /* Oft used ptids */ |
| 3824 | ptid_t null_ptid; |
| 3825 | ptid_t minus_one_ptid; |
| 3826 | |
| 3827 | /* Create a ptid given the necessary PID, LWP, and TID components. */ |
| 3828 | |
| 3829 | ptid_t |
| 3830 | ptid_build (int pid, long lwp, long tid) |
| 3831 | { |
| 3832 | ptid_t ptid; |
| 3833 | |
| 3834 | ptid.pid = pid; |
| 3835 | ptid.lwp = lwp; |
| 3836 | ptid.tid = tid; |
| 3837 | return ptid; |
| 3838 | } |
| 3839 | |
| 3840 | /* Create a ptid from just a pid. */ |
| 3841 | |
| 3842 | ptid_t |
| 3843 | pid_to_ptid (int pid) |
| 3844 | { |
| 3845 | return ptid_build (pid, 0, 0); |
| 3846 | } |
| 3847 | |
| 3848 | /* Fetch the pid (process id) component from a ptid. */ |
| 3849 | |
| 3850 | int |
| 3851 | ptid_get_pid (ptid_t ptid) |
| 3852 | { |
| 3853 | return ptid.pid; |
| 3854 | } |
| 3855 | |
| 3856 | /* Fetch the lwp (lightweight process) component from a ptid. */ |
| 3857 | |
| 3858 | long |
| 3859 | ptid_get_lwp (ptid_t ptid) |
| 3860 | { |
| 3861 | return ptid.lwp; |
| 3862 | } |
| 3863 | |
| 3864 | /* Fetch the tid (thread id) component from a ptid. */ |
| 3865 | |
| 3866 | long |
| 3867 | ptid_get_tid (ptid_t ptid) |
| 3868 | { |
| 3869 | return ptid.tid; |
| 3870 | } |
| 3871 | |
| 3872 | /* ptid_equal() is used to test equality of two ptids. */ |
| 3873 | |
| 3874 | int |
| 3875 | ptid_equal (ptid_t ptid1, ptid_t ptid2) |
| 3876 | { |
| 3877 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp |
| 3878 | && ptid1.tid == ptid2.tid); |
| 3879 | } |
| 3880 | |
| 3881 | /* restore_inferior_ptid() will be used by the cleanup machinery |
| 3882 | to restore the inferior_ptid value saved in a call to |
| 3883 | save_inferior_ptid(). */ |
| 3884 | |
| 3885 | static void |
| 3886 | restore_inferior_ptid (void *arg) |
| 3887 | { |
| 3888 | ptid_t *saved_ptid_ptr = arg; |
| 3889 | inferior_ptid = *saved_ptid_ptr; |
| 3890 | xfree (arg); |
| 3891 | } |
| 3892 | |
| 3893 | /* Save the value of inferior_ptid so that it may be restored by a |
| 3894 | later call to do_cleanups(). Returns the struct cleanup pointer |
| 3895 | needed for later doing the cleanup. */ |
| 3896 | |
| 3897 | struct cleanup * |
| 3898 | save_inferior_ptid (void) |
| 3899 | { |
| 3900 | ptid_t *saved_ptid_ptr; |
| 3901 | |
| 3902 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); |
| 3903 | *saved_ptid_ptr = inferior_ptid; |
| 3904 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); |
| 3905 | } |
| 3906 | \f |
| 3907 | |
| 3908 | void |
| 3909 | _initialize_infrun (void) |
| 3910 | { |
| 3911 | int i; |
| 3912 | int numsigs; |
| 3913 | struct cmd_list_element *c; |
| 3914 | |
| 3915 | add_info ("signals", signals_info, _("\ |
| 3916 | What debugger does when program gets various signals.\n\ |
| 3917 | Specify a signal as argument to print info on that signal only.")); |
| 3918 | add_info_alias ("handle", "signals", 0); |
| 3919 | |
| 3920 | add_com ("handle", class_run, handle_command, _("\ |
| 3921 | Specify how to handle a signal.\n\ |
| 3922 | Args are signals and actions to apply to those signals.\n\ |
| 3923 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
| 3924 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ |
| 3925 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ |
| 3926 | The special arg \"all\" is recognized to mean all signals except those\n\ |
| 3927 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
| 3928 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
| 3929 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
| 3930 | Stop means reenter debugger if this signal happens (implies print).\n\ |
| 3931 | Print means print a message if this signal happens.\n\ |
| 3932 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
| 3933 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
| 3934 | Pass and Stop may be combined.")); |
| 3935 | if (xdb_commands) |
| 3936 | { |
| 3937 | add_com ("lz", class_info, signals_info, _("\ |
| 3938 | What debugger does when program gets various signals.\n\ |
| 3939 | Specify a signal as argument to print info on that signal only.")); |
| 3940 | add_com ("z", class_run, xdb_handle_command, _("\ |
| 3941 | Specify how to handle a signal.\n\ |
| 3942 | Args are signals and actions to apply to those signals.\n\ |
| 3943 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
| 3944 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ |
| 3945 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ |
| 3946 | The special arg \"all\" is recognized to mean all signals except those\n\ |
| 3947 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
| 3948 | Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
| 3949 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
| 3950 | nopass), \"Q\" (noprint)\n\ |
| 3951 | Stop means reenter debugger if this signal happens (implies print).\n\ |
| 3952 | Print means print a message if this signal happens.\n\ |
| 3953 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
| 3954 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
| 3955 | Pass and Stop may be combined.")); |
| 3956 | } |
| 3957 | |
| 3958 | if (!dbx_commands) |
| 3959 | stop_command = add_cmd ("stop", class_obscure, |
| 3960 | not_just_help_class_command, _("\ |
| 3961 | There is no `stop' command, but you can set a hook on `stop'.\n\ |
| 3962 | This allows you to set a list of commands to be run each time execution\n\ |
| 3963 | of the program stops."), &cmdlist); |
| 3964 | |
| 3965 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
| 3966 | Set inferior debugging."), _("\ |
| 3967 | Show inferior debugging."), _("\ |
| 3968 | When non-zero, inferior specific debugging is enabled."), |
| 3969 | NULL, |
| 3970 | show_debug_infrun, |
| 3971 | &setdebuglist, &showdebuglist); |
| 3972 | |
| 3973 | numsigs = (int) TARGET_SIGNAL_LAST; |
| 3974 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
| 3975 | signal_print = (unsigned char *) |
| 3976 | xmalloc (sizeof (signal_print[0]) * numsigs); |
| 3977 | signal_program = (unsigned char *) |
| 3978 | xmalloc (sizeof (signal_program[0]) * numsigs); |
| 3979 | for (i = 0; i < numsigs; i++) |
| 3980 | { |
| 3981 | signal_stop[i] = 1; |
| 3982 | signal_print[i] = 1; |
| 3983 | signal_program[i] = 1; |
| 3984 | } |
| 3985 | |
| 3986 | /* Signals caused by debugger's own actions |
| 3987 | should not be given to the program afterwards. */ |
| 3988 | signal_program[TARGET_SIGNAL_TRAP] = 0; |
| 3989 | signal_program[TARGET_SIGNAL_INT] = 0; |
| 3990 | |
| 3991 | /* Signals that are not errors should not normally enter the debugger. */ |
| 3992 | signal_stop[TARGET_SIGNAL_ALRM] = 0; |
| 3993 | signal_print[TARGET_SIGNAL_ALRM] = 0; |
| 3994 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; |
| 3995 | signal_print[TARGET_SIGNAL_VTALRM] = 0; |
| 3996 | signal_stop[TARGET_SIGNAL_PROF] = 0; |
| 3997 | signal_print[TARGET_SIGNAL_PROF] = 0; |
| 3998 | signal_stop[TARGET_SIGNAL_CHLD] = 0; |
| 3999 | signal_print[TARGET_SIGNAL_CHLD] = 0; |
| 4000 | signal_stop[TARGET_SIGNAL_IO] = 0; |
| 4001 | signal_print[TARGET_SIGNAL_IO] = 0; |
| 4002 | signal_stop[TARGET_SIGNAL_POLL] = 0; |
| 4003 | signal_print[TARGET_SIGNAL_POLL] = 0; |
| 4004 | signal_stop[TARGET_SIGNAL_URG] = 0; |
| 4005 | signal_print[TARGET_SIGNAL_URG] = 0; |
| 4006 | signal_stop[TARGET_SIGNAL_WINCH] = 0; |
| 4007 | signal_print[TARGET_SIGNAL_WINCH] = 0; |
| 4008 | |
| 4009 | /* These signals are used internally by user-level thread |
| 4010 | implementations. (See signal(5) on Solaris.) Like the above |
| 4011 | signals, a healthy program receives and handles them as part of |
| 4012 | its normal operation. */ |
| 4013 | signal_stop[TARGET_SIGNAL_LWP] = 0; |
| 4014 | signal_print[TARGET_SIGNAL_LWP] = 0; |
| 4015 | signal_stop[TARGET_SIGNAL_WAITING] = 0; |
| 4016 | signal_print[TARGET_SIGNAL_WAITING] = 0; |
| 4017 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; |
| 4018 | signal_print[TARGET_SIGNAL_CANCEL] = 0; |
| 4019 | |
| 4020 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
| 4021 | &stop_on_solib_events, _("\ |
| 4022 | Set stopping for shared library events."), _("\ |
| 4023 | Show stopping for shared library events."), _("\ |
| 4024 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
| 4025 | notifies gdb of shared library events. The most common event of interest\n\ |
| 4026 | to the user would be loading/unloading of a new library."), |
| 4027 | NULL, |
| 4028 | show_stop_on_solib_events, |
| 4029 | &setlist, &showlist); |
| 4030 | |
| 4031 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
| 4032 | follow_fork_mode_kind_names, |
| 4033 | &follow_fork_mode_string, _("\ |
| 4034 | Set debugger response to a program call of fork or vfork."), _("\ |
| 4035 | Show debugger response to a program call of fork or vfork."), _("\ |
| 4036 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
| 4037 | parent - the original process is debugged after a fork\n\ |
| 4038 | child - the new process is debugged after a fork\n\ |
| 4039 | The unfollowed process will continue to run.\n\ |
| 4040 | By default, the debugger will follow the parent process."), |
| 4041 | NULL, |
| 4042 | show_follow_fork_mode_string, |
| 4043 | &setlist, &showlist); |
| 4044 | |
| 4045 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
| 4046 | scheduler_enums, &scheduler_mode, _("\ |
| 4047 | Set mode for locking scheduler during execution."), _("\ |
| 4048 | Show mode for locking scheduler during execution."), _("\ |
| 4049 | off == no locking (threads may preempt at any time)\n\ |
| 4050 | on == full locking (no thread except the current thread may run)\n\ |
| 4051 | step == scheduler locked during every single-step operation.\n\ |
| 4052 | In this mode, no other thread may run during a step command.\n\ |
| 4053 | Other threads may run while stepping over a function call ('next')."), |
| 4054 | set_schedlock_func, /* traps on target vector */ |
| 4055 | show_scheduler_mode, |
| 4056 | &setlist, &showlist); |
| 4057 | |
| 4058 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
| 4059 | Set mode of the step operation."), _("\ |
| 4060 | Show mode of the step operation."), _("\ |
| 4061 | When set, doing a step over a function without debug line information\n\ |
| 4062 | will stop at the first instruction of that function. Otherwise, the\n\ |
| 4063 | function is skipped and the step command stops at a different source line."), |
| 4064 | NULL, |
| 4065 | show_step_stop_if_no_debug, |
| 4066 | &setlist, &showlist); |
| 4067 | |
| 4068 | /* ptid initializations */ |
| 4069 | null_ptid = ptid_build (0, 0, 0); |
| 4070 | minus_one_ptid = ptid_build (-1, 0, 0); |
| 4071 | inferior_ptid = null_ptid; |
| 4072 | target_last_wait_ptid = minus_one_ptid; |
| 4073 | } |