| 1 | /* Target-struct-independent code to start (run) and stop an inferior process. |
| 2 | Copyright 1986, 1987, 1988, 1989, 1991, 1992, 1993 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | /* Notes on the algorithm used in wait_for_inferior to determine if we |
| 22 | just did a subroutine call when stepping. We have the following |
| 23 | information at that point: |
| 24 | |
| 25 | Current and previous (just before this step) pc. |
| 26 | Current and previous sp. |
| 27 | Current and previous start of current function. |
| 28 | |
| 29 | If the starts of the functions don't match, then |
| 30 | |
| 31 | a) We did a subroutine call. |
| 32 | |
| 33 | In this case, the pc will be at the beginning of a function. |
| 34 | |
| 35 | b) We did a subroutine return. |
| 36 | |
| 37 | Otherwise. |
| 38 | |
| 39 | c) We did a longjmp. |
| 40 | |
| 41 | If we did a longjump, we were doing "nexti", since a next would |
| 42 | have attempted to skip over the assembly language routine in which |
| 43 | the longjmp is coded and would have simply been the equivalent of a |
| 44 | continue. I consider this ok behaivior. We'd like one of two |
| 45 | things to happen if we are doing a nexti through the longjmp() |
| 46 | routine: 1) It behaves as a stepi, or 2) It acts like a continue as |
| 47 | above. Given that this is a special case, and that anybody who |
| 48 | thinks that the concept of sub calls is meaningful in the context |
| 49 | of a longjmp, I'll take either one. Let's see what happens. |
| 50 | |
| 51 | Acts like a subroutine return. I can handle that with no problem |
| 52 | at all. |
| 53 | |
| 54 | -->So: If the current and previous beginnings of the current |
| 55 | function don't match, *and* the pc is at the start of a function, |
| 56 | we've done a subroutine call. If the pc is not at the start of a |
| 57 | function, we *didn't* do a subroutine call. |
| 58 | |
| 59 | -->If the beginnings of the current and previous function do match, |
| 60 | either: |
| 61 | |
| 62 | a) We just did a recursive call. |
| 63 | |
| 64 | In this case, we would be at the very beginning of a |
| 65 | function and 1) it will have a prologue (don't jump to |
| 66 | before prologue, or 2) (we assume here that it doesn't have |
| 67 | a prologue) there will have been a change in the stack |
| 68 | pointer over the last instruction. (Ie. it's got to put |
| 69 | the saved pc somewhere. The stack is the usual place. In |
| 70 | a recursive call a register is only an option if there's a |
| 71 | prologue to do something with it. This is even true on |
| 72 | register window machines; the prologue sets up the new |
| 73 | window. It might not be true on a register window machine |
| 74 | where the call instruction moved the register window |
| 75 | itself. Hmmm. One would hope that the stack pointer would |
| 76 | also change. If it doesn't, somebody send me a note, and |
| 77 | I'll work out a more general theory. |
| 78 | bug-gdb@prep.ai.mit.edu). This is true (albeit slipperly |
| 79 | so) on all machines I'm aware of: |
| 80 | |
| 81 | m68k: Call changes stack pointer. Regular jumps don't. |
| 82 | |
| 83 | sparc: Recursive calls must have frames and therefor, |
| 84 | prologues. |
| 85 | |
| 86 | vax: All calls have frames and hence change the |
| 87 | stack pointer. |
| 88 | |
| 89 | b) We did a return from a recursive call. I don't see that we |
| 90 | have either the ability or the need to distinguish this |
| 91 | from an ordinary jump. The stack frame will be printed |
| 92 | when and if the frame pointer changes; if we are in a |
| 93 | function without a frame pointer, it's the users own |
| 94 | lookout. |
| 95 | |
| 96 | c) We did a jump within a function. We assume that this is |
| 97 | true if we didn't do a recursive call. |
| 98 | |
| 99 | d) We are in no-man's land ("I see no symbols here"). We |
| 100 | don't worry about this; it will make calls look like simple |
| 101 | jumps (and the stack frames will be printed when the frame |
| 102 | pointer moves), which is a reasonably non-violent response. |
| 103 | */ |
| 104 | |
| 105 | #include "defs.h" |
| 106 | #include <string.h> |
| 107 | #include <ctype.h> |
| 108 | #include "symtab.h" |
| 109 | #include "frame.h" |
| 110 | #include "inferior.h" |
| 111 | #include "breakpoint.h" |
| 112 | #include "wait.h" |
| 113 | #include "gdbcore.h" |
| 114 | #include "gdbcmd.h" |
| 115 | #include "target.h" |
| 116 | |
| 117 | #include <signal.h> |
| 118 | |
| 119 | /* unistd.h is needed to #define X_OK */ |
| 120 | #ifdef USG |
| 121 | #include <unistd.h> |
| 122 | #else |
| 123 | #include <sys/file.h> |
| 124 | #endif |
| 125 | |
| 126 | /* Prototypes for local functions */ |
| 127 | |
| 128 | static void |
| 129 | signals_info PARAMS ((char *, int)); |
| 130 | |
| 131 | static void |
| 132 | handle_command PARAMS ((char *, int)); |
| 133 | |
| 134 | static void |
| 135 | sig_print_info PARAMS ((int)); |
| 136 | |
| 137 | static void |
| 138 | sig_print_header PARAMS ((void)); |
| 139 | |
| 140 | static void |
| 141 | remove_step_breakpoint PARAMS ((void)); |
| 142 | |
| 143 | static void |
| 144 | insert_step_breakpoint PARAMS ((void)); |
| 145 | |
| 146 | static void |
| 147 | resume_cleanups PARAMS ((int)); |
| 148 | |
| 149 | static int |
| 150 | hook_stop_stub PARAMS ((char *)); |
| 151 | |
| 152 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
| 153 | program. It needs to examine the jmp_buf argument and extract the PC |
| 154 | from it. The return value is non-zero on success, zero otherwise. */ |
| 155 | #ifndef GET_LONGJMP_TARGET |
| 156 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 |
| 157 | #endif |
| 158 | |
| 159 | |
| 160 | /* Some machines have trampoline code that sits between function callers |
| 161 | and the actual functions themselves. If this machine doesn't have |
| 162 | such things, disable their processing. */ |
| 163 | #ifndef SKIP_TRAMPOLINE_CODE |
| 164 | #define SKIP_TRAMPOLINE_CODE(pc) 0 |
| 165 | #endif |
| 166 | |
| 167 | /* For SVR4 shared libraries, each call goes through a small piece of |
| 168 | trampoline code in the ".init" section. IN_SOLIB_TRAMPOLINE evaluates |
| 169 | to nonzero if we are current stopped in one of these. */ |
| 170 | #ifndef IN_SOLIB_TRAMPOLINE |
| 171 | #define IN_SOLIB_TRAMPOLINE(pc,name) 0 |
| 172 | #endif |
| 173 | |
| 174 | /* On some systems, the PC may be left pointing at an instruction that won't |
| 175 | actually be executed. This is usually indicated by a bit in the PSW. If |
| 176 | we find ourselves in such a state, then we step the target beyond the |
| 177 | nullified instruction before returning control to the user so as to avoid |
| 178 | confusion. */ |
| 179 | |
| 180 | #ifndef INSTRUCTION_NULLIFIED |
| 181 | #define INSTRUCTION_NULLIFIED 0 |
| 182 | #endif |
| 183 | |
| 184 | /* Tables of how to react to signals; the user sets them. */ |
| 185 | |
| 186 | static unsigned char *signal_stop; |
| 187 | static unsigned char *signal_print; |
| 188 | static unsigned char *signal_program; |
| 189 | |
| 190 | #define SET_SIGS(nsigs,sigs,flags) \ |
| 191 | do { \ |
| 192 | int signum = (nsigs); \ |
| 193 | while (signum-- > 0) \ |
| 194 | if ((sigs)[signum]) \ |
| 195 | (flags)[signum] = 1; \ |
| 196 | } while (0) |
| 197 | |
| 198 | #define UNSET_SIGS(nsigs,sigs,flags) \ |
| 199 | do { \ |
| 200 | int signum = (nsigs); \ |
| 201 | while (signum-- > 0) \ |
| 202 | if ((sigs)[signum]) \ |
| 203 | (flags)[signum] = 0; \ |
| 204 | } while (0) |
| 205 | |
| 206 | |
| 207 | /* Command list pointer for the "stop" placeholder. */ |
| 208 | |
| 209 | static struct cmd_list_element *stop_command; |
| 210 | |
| 211 | /* Nonzero if breakpoints are now inserted in the inferior. */ |
| 212 | |
| 213 | static int breakpoints_inserted; |
| 214 | |
| 215 | /* Function inferior was in as of last step command. */ |
| 216 | |
| 217 | static struct symbol *step_start_function; |
| 218 | |
| 219 | /* Nonzero => address for special breakpoint for resuming stepping. */ |
| 220 | |
| 221 | static CORE_ADDR step_resume_break_address; |
| 222 | |
| 223 | /* Pointer to orig contents of the byte where the special breakpoint is. */ |
| 224 | |
| 225 | static char step_resume_break_shadow[BREAKPOINT_MAX]; |
| 226 | |
| 227 | /* Nonzero means the special breakpoint is a duplicate |
| 228 | so it has not itself been inserted. */ |
| 229 | |
| 230 | static int step_resume_break_duplicate; |
| 231 | |
| 232 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ |
| 233 | |
| 234 | static int trap_expected; |
| 235 | |
| 236 | /* Nonzero if the next time we try to continue the inferior, it will |
| 237 | step one instruction and generate a spurious trace trap. |
| 238 | This is used to compensate for a bug in HP-UX. */ |
| 239 | |
| 240 | static int trap_expected_after_continue; |
| 241 | |
| 242 | /* Nonzero means expecting a trace trap |
| 243 | and should stop the inferior and return silently when it happens. */ |
| 244 | |
| 245 | int stop_after_trap; |
| 246 | |
| 247 | /* Nonzero means expecting a trap and caller will handle it themselves. |
| 248 | It is used after attach, due to attaching to a process; |
| 249 | when running in the shell before the child program has been exec'd; |
| 250 | and when running some kinds of remote stuff (FIXME?). */ |
| 251 | |
| 252 | int stop_soon_quietly; |
| 253 | |
| 254 | /* Nonzero if pc has been changed by the debugger |
| 255 | since the inferior stopped. */ |
| 256 | |
| 257 | int pc_changed; |
| 258 | |
| 259 | /* Nonzero if proceed is being used for a "finish" command or a similar |
| 260 | situation when stop_registers should be saved. */ |
| 261 | |
| 262 | int proceed_to_finish; |
| 263 | |
| 264 | /* Save register contents here when about to pop a stack dummy frame, |
| 265 | if-and-only-if proceed_to_finish is set. |
| 266 | Thus this contains the return value from the called function (assuming |
| 267 | values are returned in a register). */ |
| 268 | |
| 269 | char stop_registers[REGISTER_BYTES]; |
| 270 | |
| 271 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ |
| 272 | |
| 273 | static int breakpoints_failed; |
| 274 | |
| 275 | /* Nonzero after stop if current stack frame should be printed. */ |
| 276 | |
| 277 | static int stop_print_frame; |
| 278 | |
| 279 | #ifdef NO_SINGLE_STEP |
| 280 | extern int one_stepped; /* From machine dependent code */ |
| 281 | extern void single_step (); /* Same. */ |
| 282 | #endif /* NO_SINGLE_STEP */ |
| 283 | |
| 284 | \f |
| 285 | /* Things to clean up if we QUIT out of resume (). */ |
| 286 | /* ARGSUSED */ |
| 287 | static void |
| 288 | resume_cleanups (arg) |
| 289 | int arg; |
| 290 | { |
| 291 | normal_stop (); |
| 292 | } |
| 293 | |
| 294 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
| 295 | wants to interrupt some lengthy single-stepping operation |
| 296 | (for child processes, the SIGINT goes to the inferior, and so |
| 297 | we get a SIGINT random_signal, but for remote debugging and perhaps |
| 298 | other targets, that's not true). |
| 299 | |
| 300 | STEP nonzero if we should step (zero to continue instead). |
| 301 | SIG is the signal to give the inferior (zero for none). */ |
| 302 | void |
| 303 | resume (step, sig) |
| 304 | int step; |
| 305 | int sig; |
| 306 | { |
| 307 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
| 308 | QUIT; |
| 309 | |
| 310 | #ifdef NO_SINGLE_STEP |
| 311 | if (step) { |
| 312 | single_step(sig); /* Do it the hard way, w/temp breakpoints */ |
| 313 | step = 0; /* ...and don't ask hardware to do it. */ |
| 314 | } |
| 315 | #endif |
| 316 | |
| 317 | /* Handle any optimized stores to the inferior NOW... */ |
| 318 | #ifdef DO_DEFERRED_STORES |
| 319 | DO_DEFERRED_STORES; |
| 320 | #endif |
| 321 | |
| 322 | target_resume (step, sig); |
| 323 | discard_cleanups (old_cleanups); |
| 324 | } |
| 325 | |
| 326 | \f |
| 327 | /* Clear out all variables saying what to do when inferior is continued. |
| 328 | First do this, then set the ones you want, then call `proceed'. */ |
| 329 | |
| 330 | void |
| 331 | clear_proceed_status () |
| 332 | { |
| 333 | trap_expected = 0; |
| 334 | step_range_start = 0; |
| 335 | step_range_end = 0; |
| 336 | step_frame_address = 0; |
| 337 | step_over_calls = -1; |
| 338 | step_resume_break_address = 0; |
| 339 | stop_after_trap = 0; |
| 340 | stop_soon_quietly = 0; |
| 341 | proceed_to_finish = 0; |
| 342 | breakpoint_proceeded = 1; /* We're about to proceed... */ |
| 343 | |
| 344 | /* Discard any remaining commands or status from previous stop. */ |
| 345 | bpstat_clear (&stop_bpstat); |
| 346 | } |
| 347 | |
| 348 | /* Basic routine for continuing the program in various fashions. |
| 349 | |
| 350 | ADDR is the address to resume at, or -1 for resume where stopped. |
| 351 | SIGGNAL is the signal to give it, or 0 for none, |
| 352 | or -1 for act according to how it stopped. |
| 353 | STEP is nonzero if should trap after one instruction. |
| 354 | -1 means return after that and print nothing. |
| 355 | You should probably set various step_... variables |
| 356 | before calling here, if you are stepping. |
| 357 | |
| 358 | You should call clear_proceed_status before calling proceed. */ |
| 359 | |
| 360 | void |
| 361 | proceed (addr, siggnal, step) |
| 362 | CORE_ADDR addr; |
| 363 | int siggnal; |
| 364 | int step; |
| 365 | { |
| 366 | int oneproc = 0; |
| 367 | |
| 368 | if (step > 0) |
| 369 | step_start_function = find_pc_function (read_pc ()); |
| 370 | if (step < 0) |
| 371 | stop_after_trap = 1; |
| 372 | |
| 373 | if (addr == (CORE_ADDR)-1) |
| 374 | { |
| 375 | /* If there is a breakpoint at the address we will resume at, |
| 376 | step one instruction before inserting breakpoints |
| 377 | so that we do not stop right away. */ |
| 378 | |
| 379 | if (!pc_changed && breakpoint_here_p (read_pc ())) |
| 380 | oneproc = 1; |
| 381 | } |
| 382 | else |
| 383 | write_pc (addr); |
| 384 | |
| 385 | if (trap_expected_after_continue) |
| 386 | { |
| 387 | /* If (step == 0), a trap will be automatically generated after |
| 388 | the first instruction is executed. Force step one |
| 389 | instruction to clear this condition. This should not occur |
| 390 | if step is nonzero, but it is harmless in that case. */ |
| 391 | oneproc = 1; |
| 392 | trap_expected_after_continue = 0; |
| 393 | } |
| 394 | |
| 395 | if (oneproc) |
| 396 | /* We will get a trace trap after one instruction. |
| 397 | Continue it automatically and insert breakpoints then. */ |
| 398 | trap_expected = 1; |
| 399 | else |
| 400 | { |
| 401 | int temp = insert_breakpoints (); |
| 402 | if (temp) |
| 403 | { |
| 404 | print_sys_errmsg ("ptrace", temp); |
| 405 | error ("Cannot insert breakpoints.\n\ |
| 406 | The same program may be running in another process."); |
| 407 | } |
| 408 | breakpoints_inserted = 1; |
| 409 | } |
| 410 | |
| 411 | /* Install inferior's terminal modes. */ |
| 412 | target_terminal_inferior (); |
| 413 | |
| 414 | if (siggnal >= 0) |
| 415 | stop_signal = siggnal; |
| 416 | /* If this signal should not be seen by program, |
| 417 | give it zero. Used for debugging signals. */ |
| 418 | else if (stop_signal < NSIG && !signal_program[stop_signal]) |
| 419 | stop_signal= 0; |
| 420 | |
| 421 | /* Resume inferior. */ |
| 422 | resume (oneproc || step || bpstat_should_step (), stop_signal); |
| 423 | |
| 424 | /* Wait for it to stop (if not standalone) |
| 425 | and in any case decode why it stopped, and act accordingly. */ |
| 426 | |
| 427 | wait_for_inferior (); |
| 428 | normal_stop (); |
| 429 | } |
| 430 | |
| 431 | /* Record the pc and sp of the program the last time it stopped. |
| 432 | These are just used internally by wait_for_inferior, but need |
| 433 | to be preserved over calls to it and cleared when the inferior |
| 434 | is started. */ |
| 435 | static CORE_ADDR prev_pc; |
| 436 | static CORE_ADDR prev_sp; |
| 437 | static CORE_ADDR prev_func_start; |
| 438 | static char *prev_func_name; |
| 439 | |
| 440 | \f |
| 441 | /* Start remote-debugging of a machine over a serial link. */ |
| 442 | |
| 443 | void |
| 444 | start_remote () |
| 445 | { |
| 446 | init_wait_for_inferior (); |
| 447 | clear_proceed_status (); |
| 448 | stop_soon_quietly = 1; |
| 449 | trap_expected = 0; |
| 450 | wait_for_inferior (); |
| 451 | normal_stop (); |
| 452 | } |
| 453 | |
| 454 | /* Initialize static vars when a new inferior begins. */ |
| 455 | |
| 456 | void |
| 457 | init_wait_for_inferior () |
| 458 | { |
| 459 | /* These are meaningless until the first time through wait_for_inferior. */ |
| 460 | prev_pc = 0; |
| 461 | prev_sp = 0; |
| 462 | prev_func_start = 0; |
| 463 | prev_func_name = NULL; |
| 464 | |
| 465 | trap_expected_after_continue = 0; |
| 466 | breakpoints_inserted = 0; |
| 467 | mark_breakpoints_out (); |
| 468 | stop_signal = 0; /* Don't confuse first call to proceed(). */ |
| 469 | } |
| 470 | |
| 471 | |
| 472 | \f |
| 473 | /* Wait for control to return from inferior to debugger. |
| 474 | If inferior gets a signal, we may decide to start it up again |
| 475 | instead of returning. That is why there is a loop in this function. |
| 476 | When this function actually returns it means the inferior |
| 477 | should be left stopped and GDB should read more commands. */ |
| 478 | |
| 479 | void |
| 480 | wait_for_inferior () |
| 481 | { |
| 482 | WAITTYPE w; |
| 483 | int another_trap; |
| 484 | int random_signal; |
| 485 | CORE_ADDR stop_sp; |
| 486 | CORE_ADDR stop_func_start; |
| 487 | char *stop_func_name; |
| 488 | CORE_ADDR prologue_pc, tmp; |
| 489 | int stop_step_resume_break; |
| 490 | struct symtab_and_line sal; |
| 491 | int remove_breakpoints_on_following_step = 0; |
| 492 | int current_line; |
| 493 | int handling_longjmp = 0; /* FIXME */ |
| 494 | struct symtab *symtab; |
| 495 | |
| 496 | sal = find_pc_line(prev_pc, 0); |
| 497 | current_line = sal.line; |
| 498 | |
| 499 | while (1) |
| 500 | { |
| 501 | /* Clean up saved state that will become invalid. */ |
| 502 | pc_changed = 0; |
| 503 | flush_cached_frames (); |
| 504 | registers_changed (); |
| 505 | |
| 506 | target_wait (&w); |
| 507 | |
| 508 | #ifdef SIGTRAP_STOP_AFTER_LOAD |
| 509 | |
| 510 | /* Somebody called load(2), and it gave us a "trap signal after load". |
| 511 | Ignore it gracefully. */ |
| 512 | |
| 513 | SIGTRAP_STOP_AFTER_LOAD (w); |
| 514 | #endif |
| 515 | |
| 516 | /* See if the process still exists; clean up if it doesn't. */ |
| 517 | if (WIFEXITED (w)) |
| 518 | { |
| 519 | target_terminal_ours (); /* Must do this before mourn anyway */ |
| 520 | if (WEXITSTATUS (w)) |
| 521 | printf_filtered ("\nProgram exited with code 0%o.\n", |
| 522 | (unsigned int)WEXITSTATUS (w)); |
| 523 | else |
| 524 | if (!batch_mode()) |
| 525 | printf_filtered ("\nProgram exited normally.\n"); |
| 526 | fflush (stdout); |
| 527 | target_mourn_inferior (); |
| 528 | #ifdef NO_SINGLE_STEP |
| 529 | one_stepped = 0; |
| 530 | #endif |
| 531 | stop_print_frame = 0; |
| 532 | break; |
| 533 | } |
| 534 | else if (!WIFSTOPPED (w)) |
| 535 | { |
| 536 | char *signame; |
| 537 | |
| 538 | stop_print_frame = 0; |
| 539 | stop_signal = WTERMSIG (w); |
| 540 | target_terminal_ours (); /* Must do this before mourn anyway */ |
| 541 | target_kill (); /* kill mourns as well */ |
| 542 | #ifdef PRINT_RANDOM_SIGNAL |
| 543 | printf_filtered ("\nProgram terminated: "); |
| 544 | PRINT_RANDOM_SIGNAL (stop_signal); |
| 545 | #else |
| 546 | printf_filtered ("\nProgram terminated with signal "); |
| 547 | signame = strsigno (stop_signal); |
| 548 | if (signame == NULL) |
| 549 | printf_filtered ("%d", stop_signal); |
| 550 | else |
| 551 | /* Do we need to print the number in addition to the name? */ |
| 552 | printf_filtered ("%s (%d)", signame, stop_signal); |
| 553 | printf_filtered (", %s\n", safe_strsignal (stop_signal)); |
| 554 | #endif |
| 555 | printf_filtered ("The program no longer exists.\n"); |
| 556 | fflush (stdout); |
| 557 | #ifdef NO_SINGLE_STEP |
| 558 | one_stepped = 0; |
| 559 | #endif |
| 560 | break; |
| 561 | } |
| 562 | |
| 563 | #ifdef NO_SINGLE_STEP |
| 564 | if (one_stepped) |
| 565 | single_step (0); /* This actually cleans up the ss */ |
| 566 | #endif /* NO_SINGLE_STEP */ |
| 567 | |
| 568 | /* If PC is pointing at a nullified instruction, then step beyond it so that |
| 569 | the user won't be confused when GDB appears to be ready to execute it. */ |
| 570 | |
| 571 | if (INSTRUCTION_NULLIFIED) |
| 572 | { |
| 573 | resume (1, 0); |
| 574 | continue; |
| 575 | } |
| 576 | |
| 577 | stop_pc = read_pc (); |
| 578 | set_current_frame ( create_new_frame (read_fp (), |
| 579 | read_pc ())); |
| 580 | |
| 581 | stop_frame_address = FRAME_FP (get_current_frame ()); |
| 582 | stop_sp = read_sp (); |
| 583 | stop_func_start = 0; |
| 584 | stop_func_name = 0; |
| 585 | /* Don't care about return value; stop_func_start and stop_func_name |
| 586 | will both be 0 if it doesn't work. */ |
| 587 | find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start); |
| 588 | stop_func_start += FUNCTION_START_OFFSET; |
| 589 | another_trap = 0; |
| 590 | bpstat_clear (&stop_bpstat); |
| 591 | stop_step = 0; |
| 592 | stop_stack_dummy = 0; |
| 593 | stop_print_frame = 1; |
| 594 | stop_step_resume_break = 0; |
| 595 | random_signal = 0; |
| 596 | stopped_by_random_signal = 0; |
| 597 | breakpoints_failed = 0; |
| 598 | |
| 599 | /* Look at the cause of the stop, and decide what to do. |
| 600 | The alternatives are: |
| 601 | 1) break; to really stop and return to the debugger, |
| 602 | 2) drop through to start up again |
| 603 | (set another_trap to 1 to single step once) |
| 604 | 3) set random_signal to 1, and the decision between 1 and 2 |
| 605 | will be made according to the signal handling tables. */ |
| 606 | |
| 607 | stop_signal = WSTOPSIG (w); |
| 608 | |
| 609 | /* First, distinguish signals caused by the debugger from signals |
| 610 | that have to do with the program's own actions. |
| 611 | Note that breakpoint insns may cause SIGTRAP or SIGILL |
| 612 | or SIGEMT, depending on the operating system version. |
| 613 | Here we detect when a SIGILL or SIGEMT is really a breakpoint |
| 614 | and change it to SIGTRAP. */ |
| 615 | |
| 616 | if (stop_signal == SIGTRAP |
| 617 | || (breakpoints_inserted && |
| 618 | (stop_signal == SIGILL |
| 619 | #ifdef SIGEMT |
| 620 | || stop_signal == SIGEMT |
| 621 | #endif |
| 622 | )) |
| 623 | || stop_soon_quietly) |
| 624 | { |
| 625 | if (stop_signal == SIGTRAP && stop_after_trap) |
| 626 | { |
| 627 | stop_print_frame = 0; |
| 628 | break; |
| 629 | } |
| 630 | if (stop_soon_quietly) |
| 631 | break; |
| 632 | |
| 633 | /* Don't even think about breakpoints |
| 634 | if just proceeded over a breakpoint. |
| 635 | |
| 636 | However, if we are trying to proceed over a breakpoint |
| 637 | and end up in sigtramp, then step_resume_break_address |
| 638 | will be set and we should check whether we've hit the |
| 639 | step breakpoint. */ |
| 640 | if (stop_signal == SIGTRAP && trap_expected |
| 641 | && step_resume_break_address == 0) |
| 642 | bpstat_clear (&stop_bpstat); |
| 643 | else |
| 644 | { |
| 645 | /* See if there is a breakpoint at the current PC. */ |
| 646 | #if DECR_PC_AFTER_BREAK |
| 647 | /* Notice the case of stepping through a jump |
| 648 | that lands just after a breakpoint. |
| 649 | Don't confuse that with hitting the breakpoint. |
| 650 | What we check for is that 1) stepping is going on |
| 651 | and 2) the pc before the last insn does not match |
| 652 | the address of the breakpoint before the current pc. */ |
| 653 | if (prev_pc == stop_pc - DECR_PC_AFTER_BREAK |
| 654 | || !step_range_end |
| 655 | || step_resume_break_address |
| 656 | || handling_longjmp /* FIXME */) |
| 657 | #endif /* DECR_PC_AFTER_BREAK not zero */ |
| 658 | { |
| 659 | /* See if we stopped at the special breakpoint for |
| 660 | stepping over a subroutine call. If both are zero, |
| 661 | this wasn't the reason for the stop. */ |
| 662 | if (step_resume_break_address |
| 663 | && stop_pc - DECR_PC_AFTER_BREAK |
| 664 | == step_resume_break_address) |
| 665 | { |
| 666 | stop_step_resume_break = 1; |
| 667 | if (DECR_PC_AFTER_BREAK) |
| 668 | { |
| 669 | stop_pc -= DECR_PC_AFTER_BREAK; |
| 670 | write_pc (stop_pc); |
| 671 | } |
| 672 | } |
| 673 | else |
| 674 | { |
| 675 | stop_bpstat = |
| 676 | bpstat_stop_status (&stop_pc, stop_frame_address); |
| 677 | /* Following in case break condition called a |
| 678 | function. */ |
| 679 | stop_print_frame = 1; |
| 680 | } |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | if (stop_signal == SIGTRAP) |
| 685 | random_signal |
| 686 | = !(bpstat_explains_signal (stop_bpstat) |
| 687 | || trap_expected |
| 688 | || stop_step_resume_break |
| 689 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
| 690 | || (step_range_end && !step_resume_break_address)); |
| 691 | else |
| 692 | { |
| 693 | random_signal |
| 694 | = !(bpstat_explains_signal (stop_bpstat) |
| 695 | || stop_step_resume_break |
| 696 | /* End of a stack dummy. Some systems (e.g. Sony |
| 697 | news) give another signal besides SIGTRAP, |
| 698 | so check here as well as above. */ |
| 699 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
| 700 | ); |
| 701 | if (!random_signal) |
| 702 | stop_signal = SIGTRAP; |
| 703 | } |
| 704 | } |
| 705 | else |
| 706 | random_signal = 1; |
| 707 | |
| 708 | /* For the program's own signals, act according to |
| 709 | the signal handling tables. */ |
| 710 | |
| 711 | if (random_signal) |
| 712 | { |
| 713 | /* Signal not for debugging purposes. */ |
| 714 | int printed = 0; |
| 715 | |
| 716 | stopped_by_random_signal = 1; |
| 717 | |
| 718 | if (stop_signal >= NSIG |
| 719 | || signal_print[stop_signal]) |
| 720 | { |
| 721 | char *signame; |
| 722 | printed = 1; |
| 723 | target_terminal_ours_for_output (); |
| 724 | #ifdef PRINT_RANDOM_SIGNAL |
| 725 | PRINT_RANDOM_SIGNAL (stop_signal); |
| 726 | #else |
| 727 | printf_filtered ("\nProgram received signal "); |
| 728 | signame = strsigno (stop_signal); |
| 729 | if (signame == NULL) |
| 730 | printf_filtered ("%d", stop_signal); |
| 731 | else |
| 732 | /* Do we need to print the number as well as the name? */ |
| 733 | printf_filtered ("%s (%d)", signame, stop_signal); |
| 734 | printf_filtered (", %s\n", safe_strsignal (stop_signal)); |
| 735 | #endif /* PRINT_RANDOM_SIGNAL */ |
| 736 | fflush (stdout); |
| 737 | } |
| 738 | if (stop_signal >= NSIG |
| 739 | || signal_stop[stop_signal]) |
| 740 | break; |
| 741 | /* If not going to stop, give terminal back |
| 742 | if we took it away. */ |
| 743 | else if (printed) |
| 744 | target_terminal_inferior (); |
| 745 | |
| 746 | /* Clear the signal if it should not be passed. */ |
| 747 | if (signal_program[stop_signal] == 0) |
| 748 | stop_signal = 0; |
| 749 | |
| 750 | /* Note that virtually all the code below does `if !random_signal'. |
| 751 | Perhaps this code should end with a goto or continue. At least |
| 752 | one (now fixed) bug was caused by this -- a !random_signal was |
| 753 | missing in one of the tests below. */ |
| 754 | } |
| 755 | |
| 756 | /* Handle cases caused by hitting a breakpoint. */ |
| 757 | |
| 758 | if (!random_signal) |
| 759 | { |
| 760 | CORE_ADDR jmp_buf_pc; |
| 761 | enum bpstat_what what = bpstat_what (stop_bpstat); |
| 762 | |
| 763 | switch (what) |
| 764 | { |
| 765 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
| 766 | /* If we hit the breakpoint at longjmp, disable it for the |
| 767 | duration of this command. Then, install a temporary |
| 768 | breakpoint at the target of the jmp_buf. */ |
| 769 | disable_longjmp_breakpoint(); |
| 770 | remove_breakpoints (); |
| 771 | breakpoints_inserted = 0; |
| 772 | if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going; |
| 773 | |
| 774 | /* Need to blow away step-resume breakpoint, as it |
| 775 | interferes with us */ |
| 776 | remove_step_breakpoint (); |
| 777 | step_resume_break_address = 0; |
| 778 | stop_step_resume_break = 0; |
| 779 | |
| 780 | #if 0 |
| 781 | /* FIXME - Need to implement nested temporary breakpoints */ |
| 782 | if (step_over_calls > 0) |
| 783 | set_longjmp_resume_breakpoint(jmp_buf_pc, |
| 784 | get_current_frame()); |
| 785 | else |
| 786 | #endif /* 0 */ |
| 787 | set_longjmp_resume_breakpoint(jmp_buf_pc, NULL); |
| 788 | handling_longjmp = 1; /* FIXME */ |
| 789 | goto keep_going; |
| 790 | |
| 791 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
| 792 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: |
| 793 | remove_breakpoints (); |
| 794 | breakpoints_inserted = 0; |
| 795 | #if 0 |
| 796 | /* FIXME - Need to implement nested temporary breakpoints */ |
| 797 | if (step_over_calls |
| 798 | && (stop_frame_address |
| 799 | INNER_THAN step_frame_address)) |
| 800 | { |
| 801 | another_trap = 1; |
| 802 | goto keep_going; |
| 803 | } |
| 804 | #endif /* 0 */ |
| 805 | disable_longjmp_breakpoint(); |
| 806 | handling_longjmp = 0; /* FIXME */ |
| 807 | if (what == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) |
| 808 | break; |
| 809 | /* else fallthrough */ |
| 810 | |
| 811 | case BPSTAT_WHAT_SINGLE: |
| 812 | if (breakpoints_inserted) |
| 813 | remove_breakpoints (); |
| 814 | remove_step_breakpoint (); |
| 815 | breakpoints_inserted = 0; |
| 816 | another_trap = 1; |
| 817 | /* Still need to check other stuff, at least the case |
| 818 | where we are stepping and step out of the right range. */ |
| 819 | break; |
| 820 | |
| 821 | case BPSTAT_WHAT_STOP_NOISY: |
| 822 | stop_print_frame = 1; |
| 823 | goto stop_stepping; |
| 824 | |
| 825 | case BPSTAT_WHAT_STOP_SILENT: |
| 826 | stop_print_frame = 0; |
| 827 | goto stop_stepping; |
| 828 | |
| 829 | case BPSTAT_WHAT_KEEP_CHECKING: |
| 830 | break; |
| 831 | } |
| 832 | |
| 833 | if (stop_step_resume_break) |
| 834 | { |
| 835 | /* But if we have hit the step-resumption breakpoint, |
| 836 | remove it. It has done its job getting us here. |
| 837 | The sp test is to make sure that we don't get hung |
| 838 | up in recursive calls in functions without frame |
| 839 | pointers. If the stack pointer isn't outside of |
| 840 | where the breakpoint was set (within a routine to be |
| 841 | stepped over), we're in the middle of a recursive |
| 842 | call. Not true for reg window machines (sparc) |
| 843 | because the must change frames to call things and |
| 844 | the stack pointer doesn't have to change if it |
| 845 | the bp was set in a routine without a frame (pc can |
| 846 | be stored in some other window). |
| 847 | |
| 848 | The removal of the sp test is to allow calls to |
| 849 | alloca. Nasty things were happening. Oh, well, |
| 850 | gdb can only handle one level deep of lack of |
| 851 | frame pointer. */ |
| 852 | |
| 853 | /* |
| 854 | Disable test for step_frame_address match so that we always stop even if the |
| 855 | frames don't match. Reason: if we hit the step_resume_breakpoint, there is |
| 856 | no way to temporarily disable it so that we can step past it. If we leave |
| 857 | the breakpoint in, then we loop forever repeatedly hitting, but never |
| 858 | getting past the breakpoint. This change keeps nexting over recursive |
| 859 | function calls from hanging gdb. |
| 860 | */ |
| 861 | #if 0 |
| 862 | if (* step_frame_address == 0 |
| 863 | || (step_frame_address == stop_frame_address)) |
| 864 | #endif |
| 865 | { |
| 866 | remove_step_breakpoint (); |
| 867 | step_resume_break_address = 0; |
| 868 | |
| 869 | /* If were waiting for a trap, hitting the step_resume_break |
| 870 | doesn't count as getting it. */ |
| 871 | if (trap_expected) |
| 872 | another_trap = 1; |
| 873 | } |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | /* We come here if we hit a breakpoint but should not |
| 878 | stop for it. Possibly we also were stepping |
| 879 | and should stop for that. So fall through and |
| 880 | test for stepping. But, if not stepping, |
| 881 | do not stop. */ |
| 882 | |
| 883 | /* If this is the breakpoint at the end of a stack dummy, |
| 884 | just stop silently. */ |
| 885 | if (!random_signal |
| 886 | && PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)) |
| 887 | { |
| 888 | stop_print_frame = 0; |
| 889 | stop_stack_dummy = 1; |
| 890 | #ifdef HP_OS_BUG |
| 891 | trap_expected_after_continue = 1; |
| 892 | #endif |
| 893 | break; |
| 894 | } |
| 895 | |
| 896 | if (step_resume_break_address) |
| 897 | /* Having a step-resume breakpoint overrides anything |
| 898 | else having to do with stepping commands until |
| 899 | that breakpoint is reached. */ |
| 900 | ; |
| 901 | /* If stepping through a line, keep going if still within it. */ |
| 902 | else if (!random_signal |
| 903 | && step_range_end |
| 904 | && stop_pc >= step_range_start |
| 905 | && stop_pc < step_range_end |
| 906 | /* The step range might include the start of the |
| 907 | function, so if we are at the start of the |
| 908 | step range and either the stack or frame pointers |
| 909 | just changed, we've stepped outside */ |
| 910 | && !(stop_pc == step_range_start |
| 911 | && stop_frame_address |
| 912 | && (stop_sp INNER_THAN prev_sp |
| 913 | || stop_frame_address != step_frame_address))) |
| 914 | { |
| 915 | ; |
| 916 | } |
| 917 | |
| 918 | /* We stepped out of the stepping range. See if that was due |
| 919 | to a subroutine call that we should proceed to the end of. */ |
| 920 | else if (!random_signal && step_range_end) |
| 921 | { |
| 922 | /* Did we just take a signal? */ |
| 923 | if (IN_SIGTRAMP (stop_pc, stop_func_name) |
| 924 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) |
| 925 | { |
| 926 | /* This code is needed at least in the following case: |
| 927 | The user types "next" and then a signal arrives (before |
| 928 | the "next" is done). */ |
| 929 | /* We've just taken a signal; go until we are back to |
| 930 | the point where we took it and one more. */ |
| 931 | step_resume_break_address = prev_pc; |
| 932 | step_resume_break_duplicate = |
| 933 | breakpoint_here_p (step_resume_break_address); |
| 934 | if (breakpoints_inserted) |
| 935 | insert_step_breakpoint (); |
| 936 | /* Make sure that the stepping range gets us past |
| 937 | that instruction. */ |
| 938 | if (step_range_end == 1) |
| 939 | step_range_end = (step_range_start = prev_pc) + 1; |
| 940 | remove_breakpoints_on_following_step = 1; |
| 941 | goto save_pc; |
| 942 | } |
| 943 | |
| 944 | if (stop_func_start) |
| 945 | { |
| 946 | /* Do this after the IN_SIGTRAMP check; it might give |
| 947 | an error. */ |
| 948 | prologue_pc = stop_func_start; |
| 949 | SKIP_PROLOGUE (prologue_pc); |
| 950 | } |
| 951 | |
| 952 | /* ==> See comments at top of file on this algorithm. <==*/ |
| 953 | |
| 954 | if ((stop_pc == stop_func_start |
| 955 | || IN_SOLIB_TRAMPOLINE (stop_pc, stop_func_name)) |
| 956 | && (stop_func_start != prev_func_start |
| 957 | || prologue_pc != stop_func_start |
| 958 | || stop_sp != prev_sp)) |
| 959 | { |
| 960 | /* It's a subroutine call. |
| 961 | (0) If we are not stepping over any calls ("stepi"), we |
| 962 | just stop. |
| 963 | (1) If we're doing a "next", we want to continue through |
| 964 | the call ("step over the call"). |
| 965 | (2) If we are in a function-call trampoline (a stub between |
| 966 | the calling routine and the real function), locate |
| 967 | the real function and change stop_func_start. |
| 968 | (3) If we're doing a "step", and there are no debug symbols |
| 969 | at the target of the call, we want to continue through |
| 970 | it ("step over the call"). |
| 971 | (4) Otherwise, we want to stop soon, after the function |
| 972 | prologue ("step into the call"). */ |
| 973 | |
| 974 | if (step_over_calls == 0) |
| 975 | { |
| 976 | /* I presume that step_over_calls is only 0 when we're |
| 977 | supposed to be stepping at the assembly language level. */ |
| 978 | stop_step = 1; |
| 979 | break; |
| 980 | } |
| 981 | |
| 982 | if (step_over_calls > 0) |
| 983 | goto step_over_function; |
| 984 | |
| 985 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); |
| 986 | if (tmp != 0) |
| 987 | stop_func_start = tmp; |
| 988 | |
| 989 | /* If we have line number information for the function we |
| 990 | are thinking of stepping into, step into it. |
| 991 | |
| 992 | If there are several symtabs at that PC (e.g. with include |
| 993 | files), just want to know whether *any* of them have line |
| 994 | numbers. find_pc_line handles this. */ |
| 995 | { |
| 996 | struct symtab_and_line tmp_sal; |
| 997 | |
| 998 | tmp_sal = find_pc_line (stop_func_start, 0); |
| 999 | if (tmp_sal.line != 0) |
| 1000 | goto step_into_function; |
| 1001 | } |
| 1002 | |
| 1003 | step_over_function: |
| 1004 | /* A subroutine call has happened. */ |
| 1005 | /* Set a special breakpoint after the return */ |
| 1006 | step_resume_break_address = |
| 1007 | ADDR_BITS_REMOVE |
| 1008 | (SAVED_PC_AFTER_CALL (get_current_frame ())); |
| 1009 | step_resume_break_duplicate |
| 1010 | = breakpoint_here_p (step_resume_break_address); |
| 1011 | if (breakpoints_inserted) |
| 1012 | insert_step_breakpoint (); |
| 1013 | goto save_pc; |
| 1014 | |
| 1015 | step_into_function: |
| 1016 | /* Subroutine call with source code we should not step over. |
| 1017 | Do step to the first line of code in it. */ |
| 1018 | SKIP_PROLOGUE (stop_func_start); |
| 1019 | sal = find_pc_line (stop_func_start, 0); |
| 1020 | /* Use the step_resume_break to step until |
| 1021 | the end of the prologue, even if that involves jumps |
| 1022 | (as it seems to on the vax under 4.2). */ |
| 1023 | /* If the prologue ends in the middle of a source line, |
| 1024 | continue to the end of that source line. |
| 1025 | Otherwise, just go to end of prologue. */ |
| 1026 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
| 1027 | /* no, don't either. It skips any code that's |
| 1028 | legitimately on the first line. */ |
| 1029 | #else |
| 1030 | if (sal.end && sal.pc != stop_func_start) |
| 1031 | stop_func_start = sal.end; |
| 1032 | #endif |
| 1033 | |
| 1034 | if (stop_func_start == stop_pc) |
| 1035 | { |
| 1036 | /* We are already there: stop now. */ |
| 1037 | stop_step = 1; |
| 1038 | break; |
| 1039 | } |
| 1040 | else |
| 1041 | /* Put the step-breakpoint there and go until there. */ |
| 1042 | { |
| 1043 | step_resume_break_address = stop_func_start; |
| 1044 | |
| 1045 | step_resume_break_duplicate |
| 1046 | = breakpoint_here_p (step_resume_break_address); |
| 1047 | if (breakpoints_inserted) |
| 1048 | insert_step_breakpoint (); |
| 1049 | /* Do not specify what the fp should be when we stop |
| 1050 | since on some machines the prologue |
| 1051 | is where the new fp value is established. */ |
| 1052 | step_frame_address = 0; |
| 1053 | /* And make sure stepping stops right away then. */ |
| 1054 | step_range_end = step_range_start; |
| 1055 | } |
| 1056 | goto save_pc; |
| 1057 | } |
| 1058 | |
| 1059 | /* We've wandered out of the step range (but haven't done a |
| 1060 | subroutine call or return). */ |
| 1061 | |
| 1062 | sal = find_pc_line(stop_pc, 0); |
| 1063 | |
| 1064 | if (step_range_end == 1 || /* stepi or nexti */ |
| 1065 | sal.line == 0 || /* ...or no line # info */ |
| 1066 | (stop_pc == sal.pc /* ...or we're at the start */ |
| 1067 | && current_line != sal.line)) { /* of a different line */ |
| 1068 | /* Stop because we're done stepping. */ |
| 1069 | stop_step = 1; |
| 1070 | break; |
| 1071 | } else { |
| 1072 | /* We aren't done stepping, and we have line number info for $pc. |
| 1073 | Optimize by setting the step_range for the line. |
| 1074 | (We might not be in the original line, but if we entered a |
| 1075 | new line in mid-statement, we continue stepping. This makes |
| 1076 | things like for(;;) statements work better.) */ |
| 1077 | step_range_start = sal.pc; |
| 1078 | step_range_end = sal.end; |
| 1079 | goto save_pc; |
| 1080 | } |
| 1081 | /* We never fall through here */ |
| 1082 | } |
| 1083 | |
| 1084 | if (trap_expected |
| 1085 | && IN_SIGTRAMP (stop_pc, stop_func_name) |
| 1086 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) |
| 1087 | { |
| 1088 | /* What has happened here is that we have just stepped the inferior |
| 1089 | with a signal (because it is a signal which shouldn't make |
| 1090 | us stop), thus stepping into sigtramp. |
| 1091 | |
| 1092 | So we need to set a step_resume_break_address breakpoint |
| 1093 | and continue until we hit it, and then step. */ |
| 1094 | step_resume_break_address = prev_pc; |
| 1095 | /* Always 1, I think, but it's probably easier to have |
| 1096 | the step_resume_break as usual rather than trying to |
| 1097 | re-use the breakpoint which is already there. */ |
| 1098 | step_resume_break_duplicate = |
| 1099 | breakpoint_here_p (step_resume_break_address); |
| 1100 | if (breakpoints_inserted) |
| 1101 | insert_step_breakpoint (); |
| 1102 | remove_breakpoints_on_following_step = 1; |
| 1103 | another_trap = 1; |
| 1104 | } |
| 1105 | |
| 1106 | /* My apologies to the gods of structured programming. */ |
| 1107 | /* Come to this label when you need to resume the inferior. It's really much |
| 1108 | cleaner at this time to do a goto than to try and figure out what the |
| 1109 | if-else chain ought to look like!! */ |
| 1110 | |
| 1111 | keep_going: |
| 1112 | |
| 1113 | save_pc: |
| 1114 | /* Save the pc before execution, to compare with pc after stop. */ |
| 1115 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
| 1116 | prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER |
| 1117 | BREAK is defined, the |
| 1118 | original pc would not have |
| 1119 | been at the start of a |
| 1120 | function. */ |
| 1121 | prev_func_name = stop_func_name; |
| 1122 | prev_sp = stop_sp; |
| 1123 | |
| 1124 | /* If we did not do break;, it means we should keep |
| 1125 | running the inferior and not return to debugger. */ |
| 1126 | |
| 1127 | if (trap_expected && stop_signal != SIGTRAP) |
| 1128 | { |
| 1129 | /* We took a signal (which we are supposed to pass through to |
| 1130 | the inferior, else we'd have done a break above) and we |
| 1131 | haven't yet gotten our trap. Simply continue. */ |
| 1132 | resume ((step_range_end && !step_resume_break_address) |
| 1133 | || (trap_expected && !step_resume_break_address) |
| 1134 | || bpstat_should_step (), |
| 1135 | stop_signal); |
| 1136 | } |
| 1137 | else |
| 1138 | { |
| 1139 | /* Either the trap was not expected, but we are continuing |
| 1140 | anyway (the user asked that this signal be passed to the |
| 1141 | child) |
| 1142 | -- or -- |
| 1143 | The signal was SIGTRAP, e.g. it was our signal, but we |
| 1144 | decided we should resume from it. |
| 1145 | |
| 1146 | We're going to run this baby now! |
| 1147 | |
| 1148 | Insert breakpoints now, unless we are trying |
| 1149 | to one-proceed past a breakpoint. */ |
| 1150 | /* If we've just finished a special step resume and we don't |
| 1151 | want to hit a breakpoint, pull em out. */ |
| 1152 | if (!step_resume_break_address && |
| 1153 | remove_breakpoints_on_following_step) |
| 1154 | { |
| 1155 | remove_breakpoints_on_following_step = 0; |
| 1156 | remove_breakpoints (); |
| 1157 | breakpoints_inserted = 0; |
| 1158 | } |
| 1159 | else if (!breakpoints_inserted && |
| 1160 | (step_resume_break_address != 0 || !another_trap)) |
| 1161 | { |
| 1162 | insert_step_breakpoint (); |
| 1163 | breakpoints_failed = insert_breakpoints (); |
| 1164 | if (breakpoints_failed) |
| 1165 | break; |
| 1166 | breakpoints_inserted = 1; |
| 1167 | } |
| 1168 | |
| 1169 | trap_expected = another_trap; |
| 1170 | |
| 1171 | if (stop_signal == SIGTRAP) |
| 1172 | stop_signal = 0; |
| 1173 | |
| 1174 | #ifdef SHIFT_INST_REGS |
| 1175 | /* I'm not sure when this following segment applies. I do know, now, |
| 1176 | that we shouldn't rewrite the regs when we were stopped by a |
| 1177 | random signal from the inferior process. */ |
| 1178 | |
| 1179 | if (!bpstat_explains_signal (stop_bpstat) |
| 1180 | && (stop_signal != SIGCLD) |
| 1181 | && !stopped_by_random_signal) |
| 1182 | { |
| 1183 | CORE_ADDR pc_contents = read_register (PC_REGNUM); |
| 1184 | CORE_ADDR npc_contents = read_register (NPC_REGNUM); |
| 1185 | if (pc_contents != npc_contents) |
| 1186 | { |
| 1187 | write_register (NNPC_REGNUM, npc_contents); |
| 1188 | write_register (NPC_REGNUM, pc_contents); |
| 1189 | } |
| 1190 | } |
| 1191 | #endif /* SHIFT_INST_REGS */ |
| 1192 | |
| 1193 | resume ((!step_resume_break_address |
| 1194 | && !handling_longjmp |
| 1195 | && (step_range_end |
| 1196 | || trap_expected)) |
| 1197 | || bpstat_should_step (), |
| 1198 | stop_signal); |
| 1199 | } |
| 1200 | } |
| 1201 | |
| 1202 | stop_stepping: |
| 1203 | if (target_has_execution) |
| 1204 | { |
| 1205 | /* Assuming the inferior still exists, set these up for next |
| 1206 | time, just like we did above if we didn't break out of the |
| 1207 | loop. */ |
| 1208 | prev_pc = read_pc (); |
| 1209 | prev_func_start = stop_func_start; |
| 1210 | prev_func_name = stop_func_name; |
| 1211 | prev_sp = stop_sp; |
| 1212 | } |
| 1213 | } |
| 1214 | \f |
| 1215 | /* Here to return control to GDB when the inferior stops for real. |
| 1216 | Print appropriate messages, remove breakpoints, give terminal our modes. |
| 1217 | |
| 1218 | STOP_PRINT_FRAME nonzero means print the executing frame |
| 1219 | (pc, function, args, file, line number and line text). |
| 1220 | BREAKPOINTS_FAILED nonzero means stop was due to error |
| 1221 | attempting to insert breakpoints. */ |
| 1222 | |
| 1223 | void |
| 1224 | normal_stop () |
| 1225 | { |
| 1226 | /* Make sure that the current_frame's pc is correct. This |
| 1227 | is a correction for setting up the frame info before doing |
| 1228 | DECR_PC_AFTER_BREAK */ |
| 1229 | if (target_has_execution) |
| 1230 | (get_current_frame ())->pc = read_pc (); |
| 1231 | |
| 1232 | if (breakpoints_failed) |
| 1233 | { |
| 1234 | target_terminal_ours_for_output (); |
| 1235 | print_sys_errmsg ("ptrace", breakpoints_failed); |
| 1236 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
| 1237 | The same program may be running in another process.\n"); |
| 1238 | } |
| 1239 | |
| 1240 | if (target_has_execution) |
| 1241 | remove_step_breakpoint (); |
| 1242 | |
| 1243 | if (target_has_execution && breakpoints_inserted) |
| 1244 | if (remove_breakpoints ()) |
| 1245 | { |
| 1246 | target_terminal_ours_for_output (); |
| 1247 | printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\ |
| 1248 | It might be running in another process.\n\ |
| 1249 | Further execution is probably impossible.\n"); |
| 1250 | } |
| 1251 | |
| 1252 | breakpoints_inserted = 0; |
| 1253 | |
| 1254 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
| 1255 | Delete any breakpoint that is to be deleted at the next stop. */ |
| 1256 | |
| 1257 | breakpoint_auto_delete (stop_bpstat); |
| 1258 | |
| 1259 | /* If an auto-display called a function and that got a signal, |
| 1260 | delete that auto-display to avoid an infinite recursion. */ |
| 1261 | |
| 1262 | if (stopped_by_random_signal) |
| 1263 | disable_current_display (); |
| 1264 | |
| 1265 | if (step_multi && stop_step) |
| 1266 | return; |
| 1267 | |
| 1268 | target_terminal_ours (); |
| 1269 | |
| 1270 | /* Look up the hook_stop and run it if it exists. */ |
| 1271 | |
| 1272 | if (stop_command->hook) |
| 1273 | { |
| 1274 | catch_errors (hook_stop_stub, (char *)stop_command->hook, |
| 1275 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
| 1276 | } |
| 1277 | |
| 1278 | if (!target_has_stack) |
| 1279 | return; |
| 1280 | |
| 1281 | /* Select innermost stack frame except on return from a stack dummy routine, |
| 1282 | or if the program has exited. Print it without a level number if |
| 1283 | we have changed functions or hit a breakpoint. Print source line |
| 1284 | if we have one. */ |
| 1285 | if (!stop_stack_dummy) |
| 1286 | { |
| 1287 | select_frame (get_current_frame (), 0); |
| 1288 | |
| 1289 | if (stop_print_frame) |
| 1290 | { |
| 1291 | int source_only; |
| 1292 | |
| 1293 | source_only = bpstat_print (stop_bpstat); |
| 1294 | source_only = source_only || |
| 1295 | ( stop_step |
| 1296 | && step_frame_address == stop_frame_address |
| 1297 | && step_start_function == find_pc_function (stop_pc)); |
| 1298 | |
| 1299 | print_stack_frame (selected_frame, -1, source_only? -1: 1); |
| 1300 | |
| 1301 | /* Display the auto-display expressions. */ |
| 1302 | do_displays (); |
| 1303 | } |
| 1304 | } |
| 1305 | |
| 1306 | /* Save the function value return registers, if we care. |
| 1307 | We might be about to restore their previous contents. */ |
| 1308 | if (proceed_to_finish) |
| 1309 | read_register_bytes (0, stop_registers, REGISTER_BYTES); |
| 1310 | |
| 1311 | if (stop_stack_dummy) |
| 1312 | { |
| 1313 | /* Pop the empty frame that contains the stack dummy. |
| 1314 | POP_FRAME ends with a setting of the current frame, so we |
| 1315 | can use that next. */ |
| 1316 | POP_FRAME; |
| 1317 | select_frame (get_current_frame (), 0); |
| 1318 | } |
| 1319 | } |
| 1320 | |
| 1321 | static int |
| 1322 | hook_stop_stub (cmd) |
| 1323 | char *cmd; |
| 1324 | { |
| 1325 | execute_user_command ((struct cmd_list_element *)cmd, 0); |
| 1326 | return (0); |
| 1327 | } |
| 1328 | |
| 1329 | \f |
| 1330 | static void |
| 1331 | insert_step_breakpoint () |
| 1332 | { |
| 1333 | if (step_resume_break_address && !step_resume_break_duplicate) |
| 1334 | target_insert_breakpoint (step_resume_break_address, |
| 1335 | step_resume_break_shadow); |
| 1336 | } |
| 1337 | |
| 1338 | static void |
| 1339 | remove_step_breakpoint () |
| 1340 | { |
| 1341 | if (step_resume_break_address && !step_resume_break_duplicate) |
| 1342 | target_remove_breakpoint (step_resume_break_address, |
| 1343 | step_resume_break_shadow); |
| 1344 | } |
| 1345 | \f |
| 1346 | int signal_stop_state (signo) |
| 1347 | int signo; |
| 1348 | { |
| 1349 | return ((signo >= 0 && signo < NSIG) ? signal_stop[signo] : 0); |
| 1350 | } |
| 1351 | |
| 1352 | int signal_print_state (signo) |
| 1353 | int signo; |
| 1354 | { |
| 1355 | return ((signo >= 0 && signo < NSIG) ? signal_print[signo] : 0); |
| 1356 | } |
| 1357 | |
| 1358 | int signal_pass_state (signo) |
| 1359 | int signo; |
| 1360 | { |
| 1361 | return ((signo >= 0 && signo < NSIG) ? signal_program[signo] : 0); |
| 1362 | } |
| 1363 | |
| 1364 | static void |
| 1365 | sig_print_header () |
| 1366 | { |
| 1367 | printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n"); |
| 1368 | } |
| 1369 | |
| 1370 | static void |
| 1371 | sig_print_info (number) |
| 1372 | int number; |
| 1373 | { |
| 1374 | char *name; |
| 1375 | |
| 1376 | if ((name = strsigno (number)) == NULL) |
| 1377 | printf_filtered ("%d\t\t", number); |
| 1378 | else |
| 1379 | printf_filtered ("%s (%d)\t", name, number); |
| 1380 | printf_filtered ("%s\t", signal_stop[number] ? "Yes" : "No"); |
| 1381 | printf_filtered ("%s\t", signal_print[number] ? "Yes" : "No"); |
| 1382 | printf_filtered ("%s\t\t", signal_program[number] ? "Yes" : "No"); |
| 1383 | printf_filtered ("%s\n", safe_strsignal (number)); |
| 1384 | } |
| 1385 | |
| 1386 | /* Specify how various signals in the inferior should be handled. */ |
| 1387 | |
| 1388 | static void |
| 1389 | handle_command (args, from_tty) |
| 1390 | char *args; |
| 1391 | int from_tty; |
| 1392 | { |
| 1393 | char **argv; |
| 1394 | int digits, wordlen; |
| 1395 | int sigfirst, signum, siglast; |
| 1396 | int allsigs; |
| 1397 | int nsigs; |
| 1398 | unsigned char *sigs; |
| 1399 | struct cleanup *old_chain; |
| 1400 | |
| 1401 | if (args == NULL) |
| 1402 | { |
| 1403 | error_no_arg ("signal to handle"); |
| 1404 | } |
| 1405 | |
| 1406 | /* Allocate and zero an array of flags for which signals to handle. */ |
| 1407 | |
| 1408 | nsigs = signo_max () + 1; |
| 1409 | sigs = (unsigned char *) alloca (nsigs); |
| 1410 | memset (sigs, 0, nsigs); |
| 1411 | |
| 1412 | /* Break the command line up into args. */ |
| 1413 | |
| 1414 | argv = buildargv (args); |
| 1415 | if (argv == NULL) |
| 1416 | { |
| 1417 | nomem (0); |
| 1418 | } |
| 1419 | old_chain = make_cleanup (freeargv, (char *) argv); |
| 1420 | |
| 1421 | /* Walk through the args, looking for signal numbers, signal names, and |
| 1422 | actions. Signal numbers and signal names may be interspersed with |
| 1423 | actions, with the actions being performed for all signals cumulatively |
| 1424 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
| 1425 | |
| 1426 | while (*argv != NULL) |
| 1427 | { |
| 1428 | wordlen = strlen (*argv); |
| 1429 | for (digits = 0; isdigit ((*argv)[digits]); digits++) {;} |
| 1430 | allsigs = 0; |
| 1431 | sigfirst = siglast = -1; |
| 1432 | |
| 1433 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) |
| 1434 | { |
| 1435 | /* Apply action to all signals except those used by the |
| 1436 | debugger. Silently skip those. */ |
| 1437 | allsigs = 1; |
| 1438 | sigfirst = 0; |
| 1439 | siglast = nsigs - 1; |
| 1440 | } |
| 1441 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) |
| 1442 | { |
| 1443 | SET_SIGS (nsigs, sigs, signal_stop); |
| 1444 | SET_SIGS (nsigs, sigs, signal_print); |
| 1445 | } |
| 1446 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) |
| 1447 | { |
| 1448 | UNSET_SIGS (nsigs, sigs, signal_program); |
| 1449 | } |
| 1450 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) |
| 1451 | { |
| 1452 | SET_SIGS (nsigs, sigs, signal_print); |
| 1453 | } |
| 1454 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) |
| 1455 | { |
| 1456 | SET_SIGS (nsigs, sigs, signal_program); |
| 1457 | } |
| 1458 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) |
| 1459 | { |
| 1460 | UNSET_SIGS (nsigs, sigs, signal_stop); |
| 1461 | } |
| 1462 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) |
| 1463 | { |
| 1464 | SET_SIGS (nsigs, sigs, signal_program); |
| 1465 | } |
| 1466 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) |
| 1467 | { |
| 1468 | UNSET_SIGS (nsigs, sigs, signal_print); |
| 1469 | UNSET_SIGS (nsigs, sigs, signal_stop); |
| 1470 | } |
| 1471 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) |
| 1472 | { |
| 1473 | UNSET_SIGS (nsigs, sigs, signal_program); |
| 1474 | } |
| 1475 | else if (digits > 0) |
| 1476 | { |
| 1477 | sigfirst = siglast = atoi (*argv); |
| 1478 | if ((*argv)[digits] == '-') |
| 1479 | { |
| 1480 | siglast = atoi ((*argv) + digits + 1); |
| 1481 | } |
| 1482 | if (sigfirst > siglast) |
| 1483 | { |
| 1484 | /* Bet he didn't figure we'd think of this case... */ |
| 1485 | signum = sigfirst; |
| 1486 | sigfirst = siglast; |
| 1487 | siglast = signum; |
| 1488 | } |
| 1489 | if (sigfirst < 0 || sigfirst >= nsigs) |
| 1490 | { |
| 1491 | error ("Signal %d not in range 0-%d", sigfirst, nsigs - 1); |
| 1492 | } |
| 1493 | if (siglast < 0 || siglast >= nsigs) |
| 1494 | { |
| 1495 | error ("Signal %d not in range 0-%d", siglast, nsigs - 1); |
| 1496 | } |
| 1497 | } |
| 1498 | else if ((signum = strtosigno (*argv)) != 0) |
| 1499 | { |
| 1500 | sigfirst = siglast = signum; |
| 1501 | } |
| 1502 | else |
| 1503 | { |
| 1504 | /* Not a number and not a recognized flag word => complain. */ |
| 1505 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); |
| 1506 | } |
| 1507 | |
| 1508 | /* If any signal numbers or symbol names were found, set flags for |
| 1509 | which signals to apply actions to. */ |
| 1510 | |
| 1511 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
| 1512 | { |
| 1513 | switch (signum) |
| 1514 | { |
| 1515 | case SIGTRAP: |
| 1516 | case SIGINT: |
| 1517 | if (!allsigs && !sigs[signum]) |
| 1518 | { |
| 1519 | if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum))) |
| 1520 | { |
| 1521 | sigs[signum] = 1; |
| 1522 | } |
| 1523 | else |
| 1524 | { |
| 1525 | printf ("Not confirmed, unchanged.\n"); |
| 1526 | fflush (stdout); |
| 1527 | } |
| 1528 | } |
| 1529 | break; |
| 1530 | default: |
| 1531 | sigs[signum] = 1; |
| 1532 | break; |
| 1533 | } |
| 1534 | } |
| 1535 | |
| 1536 | argv++; |
| 1537 | } |
| 1538 | |
| 1539 | target_notice_signals(); |
| 1540 | |
| 1541 | if (from_tty) |
| 1542 | { |
| 1543 | /* Show the results. */ |
| 1544 | sig_print_header (); |
| 1545 | for (signum = 0; signum < nsigs; signum++) |
| 1546 | { |
| 1547 | if (sigs[signum]) |
| 1548 | { |
| 1549 | sig_print_info (signum); |
| 1550 | } |
| 1551 | } |
| 1552 | } |
| 1553 | |
| 1554 | do_cleanups (old_chain); |
| 1555 | } |
| 1556 | |
| 1557 | /* Print current contents of the tables set by the handle command. */ |
| 1558 | |
| 1559 | static void |
| 1560 | signals_info (signum_exp, from_tty) |
| 1561 | char *signum_exp; |
| 1562 | int from_tty; |
| 1563 | { |
| 1564 | register int i; |
| 1565 | sig_print_header (); |
| 1566 | |
| 1567 | if (signum_exp) |
| 1568 | { |
| 1569 | /* First see if this is a symbol name. */ |
| 1570 | i = strtosigno (signum_exp); |
| 1571 | if (i == 0) |
| 1572 | { |
| 1573 | /* Nope, maybe it's an address which evaluates to a signal |
| 1574 | number. */ |
| 1575 | i = parse_and_eval_address (signum_exp); |
| 1576 | if (i >= NSIG || i < 0) |
| 1577 | error ("Signal number out of bounds."); |
| 1578 | } |
| 1579 | sig_print_info (i); |
| 1580 | return; |
| 1581 | } |
| 1582 | |
| 1583 | printf_filtered ("\n"); |
| 1584 | for (i = 0; i < NSIG; i++) |
| 1585 | { |
| 1586 | QUIT; |
| 1587 | |
| 1588 | sig_print_info (i); |
| 1589 | } |
| 1590 | |
| 1591 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); |
| 1592 | } |
| 1593 | \f |
| 1594 | /* Save all of the information associated with the inferior<==>gdb |
| 1595 | connection. INF_STATUS is a pointer to a "struct inferior_status" |
| 1596 | (defined in inferior.h). */ |
| 1597 | |
| 1598 | void |
| 1599 | save_inferior_status (inf_status, restore_stack_info) |
| 1600 | struct inferior_status *inf_status; |
| 1601 | int restore_stack_info; |
| 1602 | { |
| 1603 | inf_status->pc_changed = pc_changed; |
| 1604 | inf_status->stop_signal = stop_signal; |
| 1605 | inf_status->stop_pc = stop_pc; |
| 1606 | inf_status->stop_frame_address = stop_frame_address; |
| 1607 | inf_status->stop_step = stop_step; |
| 1608 | inf_status->stop_stack_dummy = stop_stack_dummy; |
| 1609 | inf_status->stopped_by_random_signal = stopped_by_random_signal; |
| 1610 | inf_status->trap_expected = trap_expected; |
| 1611 | inf_status->step_range_start = step_range_start; |
| 1612 | inf_status->step_range_end = step_range_end; |
| 1613 | inf_status->step_frame_address = step_frame_address; |
| 1614 | inf_status->step_over_calls = step_over_calls; |
| 1615 | inf_status->step_resume_break_address = step_resume_break_address; |
| 1616 | inf_status->stop_after_trap = stop_after_trap; |
| 1617 | inf_status->stop_soon_quietly = stop_soon_quietly; |
| 1618 | /* Save original bpstat chain here; replace it with copy of chain. |
| 1619 | If caller's caller is walking the chain, they'll be happier if we |
| 1620 | hand them back the original chain when restore_i_s is called. */ |
| 1621 | inf_status->stop_bpstat = stop_bpstat; |
| 1622 | stop_bpstat = bpstat_copy (stop_bpstat); |
| 1623 | inf_status->breakpoint_proceeded = breakpoint_proceeded; |
| 1624 | inf_status->restore_stack_info = restore_stack_info; |
| 1625 | inf_status->proceed_to_finish = proceed_to_finish; |
| 1626 | |
| 1627 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
| 1628 | |
| 1629 | record_selected_frame (&(inf_status->selected_frame_address), |
| 1630 | &(inf_status->selected_level)); |
| 1631 | return; |
| 1632 | } |
| 1633 | |
| 1634 | void |
| 1635 | restore_inferior_status (inf_status) |
| 1636 | struct inferior_status *inf_status; |
| 1637 | { |
| 1638 | FRAME fid; |
| 1639 | int level = inf_status->selected_level; |
| 1640 | |
| 1641 | pc_changed = inf_status->pc_changed; |
| 1642 | stop_signal = inf_status->stop_signal; |
| 1643 | stop_pc = inf_status->stop_pc; |
| 1644 | stop_frame_address = inf_status->stop_frame_address; |
| 1645 | stop_step = inf_status->stop_step; |
| 1646 | stop_stack_dummy = inf_status->stop_stack_dummy; |
| 1647 | stopped_by_random_signal = inf_status->stopped_by_random_signal; |
| 1648 | trap_expected = inf_status->trap_expected; |
| 1649 | step_range_start = inf_status->step_range_start; |
| 1650 | step_range_end = inf_status->step_range_end; |
| 1651 | step_frame_address = inf_status->step_frame_address; |
| 1652 | step_over_calls = inf_status->step_over_calls; |
| 1653 | step_resume_break_address = inf_status->step_resume_break_address; |
| 1654 | stop_after_trap = inf_status->stop_after_trap; |
| 1655 | stop_soon_quietly = inf_status->stop_soon_quietly; |
| 1656 | bpstat_clear (&stop_bpstat); |
| 1657 | stop_bpstat = inf_status->stop_bpstat; |
| 1658 | breakpoint_proceeded = inf_status->breakpoint_proceeded; |
| 1659 | proceed_to_finish = inf_status->proceed_to_finish; |
| 1660 | |
| 1661 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
| 1662 | |
| 1663 | /* The inferior can be gone if the user types "print exit(0)" |
| 1664 | (and perhaps other times). */ |
| 1665 | if (target_has_stack && inf_status->restore_stack_info) |
| 1666 | { |
| 1667 | fid = find_relative_frame (get_current_frame (), |
| 1668 | &level); |
| 1669 | |
| 1670 | /* If inf_status->selected_frame_address is NULL, there was no |
| 1671 | previously selected frame. */ |
| 1672 | if (fid == 0 || |
| 1673 | FRAME_FP (fid) != inf_status->selected_frame_address || |
| 1674 | level != 0) |
| 1675 | { |
| 1676 | #if 1 |
| 1677 | /* I'm not sure this error message is a good idea. I have |
| 1678 | only seen it occur after "Can't continue previously |
| 1679 | requested operation" (we get called from do_cleanups), in |
| 1680 | which case it just adds insult to injury (one confusing |
| 1681 | error message after another. Besides which, does the |
| 1682 | user really care if we can't restore the previously |
| 1683 | selected frame? */ |
| 1684 | fprintf (stderr, "Unable to restore previously selected frame.\n"); |
| 1685 | #endif |
| 1686 | select_frame (get_current_frame (), 0); |
| 1687 | return; |
| 1688 | } |
| 1689 | |
| 1690 | select_frame (fid, inf_status->selected_level); |
| 1691 | } |
| 1692 | } |
| 1693 | |
| 1694 | \f |
| 1695 | void |
| 1696 | _initialize_infrun () |
| 1697 | { |
| 1698 | register int i; |
| 1699 | register int numsigs; |
| 1700 | |
| 1701 | add_info ("signals", signals_info, |
| 1702 | "What debugger does when program gets various signals.\n\ |
| 1703 | Specify a signal number as argument to print info on that signal only."); |
| 1704 | add_info_alias ("handle", "signals", 0); |
| 1705 | |
| 1706 | add_com ("handle", class_run, handle_command, |
| 1707 | "Specify how to handle a signal.\n\ |
| 1708 | Args are signal numbers and actions to apply to those signals.\n\ |
| 1709 | Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\ |
| 1710 | Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\ |
| 1711 | The special arg \"all\" is recognized to mean all signals except those\n\ |
| 1712 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
| 1713 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
| 1714 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
| 1715 | Stop means reenter debugger if this signal happens (implies print).\n\ |
| 1716 | Print means print a message if this signal happens.\n\ |
| 1717 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
| 1718 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
| 1719 | Pass and Stop may be combined."); |
| 1720 | |
| 1721 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, |
| 1722 | "There is no `stop' command, but you can set a hook on `stop'.\n\ |
| 1723 | This allows you to set a list of commands to be run each time execution\n\ |
| 1724 | of the program stops.", &cmdlist); |
| 1725 | |
| 1726 | numsigs = signo_max () + 1; |
| 1727 | signal_stop = (unsigned char *) |
| 1728 | xmalloc (sizeof (signal_stop[0]) * numsigs); |
| 1729 | signal_print = (unsigned char *) |
| 1730 | xmalloc (sizeof (signal_print[0]) * numsigs); |
| 1731 | signal_program = (unsigned char *) |
| 1732 | xmalloc (sizeof (signal_program[0]) * numsigs); |
| 1733 | for (i = 0; i < numsigs; i++) |
| 1734 | { |
| 1735 | signal_stop[i] = 1; |
| 1736 | signal_print[i] = 1; |
| 1737 | signal_program[i] = 1; |
| 1738 | } |
| 1739 | |
| 1740 | /* Signals caused by debugger's own actions |
| 1741 | should not be given to the program afterwards. */ |
| 1742 | signal_program[SIGTRAP] = 0; |
| 1743 | signal_program[SIGINT] = 0; |
| 1744 | |
| 1745 | /* Signals that are not errors should not normally enter the debugger. */ |
| 1746 | #ifdef SIGALRM |
| 1747 | signal_stop[SIGALRM] = 0; |
| 1748 | signal_print[SIGALRM] = 0; |
| 1749 | #endif /* SIGALRM */ |
| 1750 | #ifdef SIGVTALRM |
| 1751 | signal_stop[SIGVTALRM] = 0; |
| 1752 | signal_print[SIGVTALRM] = 0; |
| 1753 | #endif /* SIGVTALRM */ |
| 1754 | #ifdef SIGPROF |
| 1755 | signal_stop[SIGPROF] = 0; |
| 1756 | signal_print[SIGPROF] = 0; |
| 1757 | #endif /* SIGPROF */ |
| 1758 | #ifdef SIGCHLD |
| 1759 | signal_stop[SIGCHLD] = 0; |
| 1760 | signal_print[SIGCHLD] = 0; |
| 1761 | #endif /* SIGCHLD */ |
| 1762 | #ifdef SIGCLD |
| 1763 | signal_stop[SIGCLD] = 0; |
| 1764 | signal_print[SIGCLD] = 0; |
| 1765 | #endif /* SIGCLD */ |
| 1766 | #ifdef SIGIO |
| 1767 | signal_stop[SIGIO] = 0; |
| 1768 | signal_print[SIGIO] = 0; |
| 1769 | #endif /* SIGIO */ |
| 1770 | #ifdef SIGURG |
| 1771 | signal_stop[SIGURG] = 0; |
| 1772 | signal_print[SIGURG] = 0; |
| 1773 | #endif /* SIGURG */ |
| 1774 | } |