| 1 | /* Start (run) and stop the inferior process, for GDB. |
| 2 | Copyright 1986, 1987, 1988, 1989, 1991, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | /* Notes on the algorithm used in wait_for_inferior to determine if we |
| 21 | just did a subroutine call when stepping. We have the following |
| 22 | information at that point: |
| 23 | |
| 24 | Current and previous (just before this step) pc. |
| 25 | Current and previous sp. |
| 26 | Current and previous start of current function. |
| 27 | |
| 28 | If the starts of the functions don't match, then |
| 29 | |
| 30 | a) We did a subroutine call. |
| 31 | |
| 32 | In this case, the pc will be at the beginning of a function. |
| 33 | |
| 34 | b) We did a subroutine return. |
| 35 | |
| 36 | Otherwise. |
| 37 | |
| 38 | c) We did a longjmp. |
| 39 | |
| 40 | If we did a longjump, we were doing "nexti", since a next would |
| 41 | have attempted to skip over the assembly language routine in which |
| 42 | the longjmp is coded and would have simply been the equivalent of a |
| 43 | continue. I consider this ok behaivior. We'd like one of two |
| 44 | things to happen if we are doing a nexti through the longjmp() |
| 45 | routine: 1) It behaves as a stepi, or 2) It acts like a continue as |
| 46 | above. Given that this is a special case, and that anybody who |
| 47 | thinks that the concept of sub calls is meaningful in the context |
| 48 | of a longjmp, I'll take either one. Let's see what happens. |
| 49 | |
| 50 | Acts like a subroutine return. I can handle that with no problem |
| 51 | at all. |
| 52 | |
| 53 | -->So: If the current and previous beginnings of the current |
| 54 | function don't match, *and* the pc is at the start of a function, |
| 55 | we've done a subroutine call. If the pc is not at the start of a |
| 56 | function, we *didn't* do a subroutine call. |
| 57 | |
| 58 | -->If the beginnings of the current and previous function do match, |
| 59 | either: |
| 60 | |
| 61 | a) We just did a recursive call. |
| 62 | |
| 63 | In this case, we would be at the very beginning of a |
| 64 | function and 1) it will have a prologue (don't jump to |
| 65 | before prologue, or 2) (we assume here that it doesn't have |
| 66 | a prologue) there will have been a change in the stack |
| 67 | pointer over the last instruction. (Ie. it's got to put |
| 68 | the saved pc somewhere. The stack is the usual place. In |
| 69 | a recursive call a register is only an option if there's a |
| 70 | prologue to do something with it. This is even true on |
| 71 | register window machines; the prologue sets up the new |
| 72 | window. It might not be true on a register window machine |
| 73 | where the call instruction moved the register window |
| 74 | itself. Hmmm. One would hope that the stack pointer would |
| 75 | also change. If it doesn't, somebody send me a note, and |
| 76 | I'll work out a more general theory. |
| 77 | bug-gdb@prep.ai.mit.edu). This is true (albeit slipperly |
| 78 | so) on all machines I'm aware of: |
| 79 | |
| 80 | m68k: Call changes stack pointer. Regular jumps don't. |
| 81 | |
| 82 | sparc: Recursive calls must have frames and therefor, |
| 83 | prologues. |
| 84 | |
| 85 | vax: All calls have frames and hence change the |
| 86 | stack pointer. |
| 87 | |
| 88 | b) We did a return from a recursive call. I don't see that we |
| 89 | have either the ability or the need to distinguish this |
| 90 | from an ordinary jump. The stack frame will be printed |
| 91 | when and if the frame pointer changes; if we are in a |
| 92 | function without a frame pointer, it's the users own |
| 93 | lookout. |
| 94 | |
| 95 | c) We did a jump within a function. We assume that this is |
| 96 | true if we didn't do a recursive call. |
| 97 | |
| 98 | d) We are in no-man's land ("I see no symbols here"). We |
| 99 | don't worry about this; it will make calls look like simple |
| 100 | jumps (and the stack frames will be printed when the frame |
| 101 | pointer moves), which is a reasonably non-violent response. |
| 102 | */ |
| 103 | |
| 104 | #include "defs.h" |
| 105 | #include <string.h> |
| 106 | #include "symtab.h" |
| 107 | #include "frame.h" |
| 108 | #include "inferior.h" |
| 109 | #include "breakpoint.h" |
| 110 | #include "wait.h" |
| 111 | #include "gdbcore.h" |
| 112 | #include "command.h" |
| 113 | #include "terminal.h" /* For #ifdef TIOCGPGRP and new_tty */ |
| 114 | #include "target.h" |
| 115 | |
| 116 | #include <signal.h> |
| 117 | |
| 118 | /* unistd.h is needed to #define X_OK */ |
| 119 | #ifdef USG |
| 120 | #include <unistd.h> |
| 121 | #else |
| 122 | #include <sys/file.h> |
| 123 | #endif |
| 124 | |
| 125 | #ifdef SET_STACK_LIMIT_HUGE |
| 126 | #include <sys/time.h> |
| 127 | #include <sys/resource.h> |
| 128 | |
| 129 | extern int original_stack_limit; |
| 130 | #endif /* SET_STACK_LIMIT_HUGE */ |
| 131 | |
| 132 | /* Prototypes for local functions */ |
| 133 | |
| 134 | static void |
| 135 | signals_info PARAMS ((char *, int)); |
| 136 | |
| 137 | static void |
| 138 | handle_command PARAMS ((char *, int)); |
| 139 | |
| 140 | static void |
| 141 | sig_print_info PARAMS ((int)); |
| 142 | |
| 143 | static void |
| 144 | sig_print_header PARAMS ((void)); |
| 145 | |
| 146 | static void |
| 147 | remove_step_breakpoint PARAMS ((void)); |
| 148 | |
| 149 | static void |
| 150 | insert_step_breakpoint PARAMS ((void)); |
| 151 | |
| 152 | static void |
| 153 | resume PARAMS ((int, int)); |
| 154 | |
| 155 | static void |
| 156 | resume_cleanups PARAMS ((int)); |
| 157 | |
| 158 | extern char **environ; |
| 159 | |
| 160 | extern struct target_ops child_ops; /* In inftarg.c */ |
| 161 | |
| 162 | /* Sigtramp is a routine that the kernel calls (which then calls the |
| 163 | signal handler). On most machines it is a library routine that |
| 164 | is linked into the executable. |
| 165 | |
| 166 | This macro, given a program counter value and the name of the |
| 167 | function in which that PC resides (which can be null if the |
| 168 | name is not known), returns nonzero if the PC and name show |
| 169 | that we are in sigtramp. |
| 170 | |
| 171 | On most machines just see if the name is sigtramp (and if we have |
| 172 | no name, assume we are not in sigtramp). */ |
| 173 | #if !defined (IN_SIGTRAMP) |
| 174 | #define IN_SIGTRAMP(pc, name) \ |
| 175 | (name && !strcmp ("_sigtramp", name)) |
| 176 | #endif |
| 177 | |
| 178 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
| 179 | program. It needs to examine the jmp_buf argument and extract the PC |
| 180 | from it. The return value is non-zero on success, zero otherwise. */ |
| 181 | #ifndef GET_LONGJMP_TARGET |
| 182 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 |
| 183 | #endif |
| 184 | |
| 185 | |
| 186 | /* Some machines have trampoline code that sits between function callers |
| 187 | and the actual functions themselves. If this machine doesn't have |
| 188 | such things, disable their processing. */ |
| 189 | #ifndef SKIP_TRAMPOLINE_CODE |
| 190 | #define SKIP_TRAMPOLINE_CODE(pc) 0 |
| 191 | #endif |
| 192 | |
| 193 | /* For SVR4 shared libraries, each call goes through a small piece of |
| 194 | trampoline code in the ".init" section. IN_SOLIB_TRAMPOLINE evaluates |
| 195 | to nonzero if we are current stopped in one of these. */ |
| 196 | #ifndef IN_SOLIB_TRAMPOLINE |
| 197 | #define IN_SOLIB_TRAMPOLINE(pc,name) 0 |
| 198 | #endif |
| 199 | |
| 200 | /* Notify other parts of gdb that might care that signal handling may |
| 201 | have changed for one or more signals. */ |
| 202 | #ifndef NOTICE_SIGNAL_HANDLING_CHANGE |
| 203 | #define NOTICE_SIGNAL_HANDLING_CHANGE /* No actions */ |
| 204 | #endif |
| 205 | |
| 206 | #ifdef TDESC |
| 207 | #include "tdesc.h" |
| 208 | int safe_to_init_tdesc_context = 0; |
| 209 | extern dc_dcontext_t current_context; |
| 210 | #endif |
| 211 | |
| 212 | /* Tables of how to react to signals; the user sets them. */ |
| 213 | |
| 214 | static char *signal_stop; |
| 215 | static char *signal_print; |
| 216 | static char *signal_program; |
| 217 | |
| 218 | /* Nonzero if breakpoints are now inserted in the inferior. */ |
| 219 | /* Nonstatic for initialization during xxx_create_inferior. FIXME. */ |
| 220 | |
| 221 | /*static*/ int breakpoints_inserted; |
| 222 | |
| 223 | /* Function inferior was in as of last step command. */ |
| 224 | |
| 225 | static struct symbol *step_start_function; |
| 226 | |
| 227 | /* Nonzero => address for special breakpoint for resuming stepping. */ |
| 228 | |
| 229 | static CORE_ADDR step_resume_break_address; |
| 230 | |
| 231 | /* Pointer to orig contents of the byte where the special breakpoint is. */ |
| 232 | |
| 233 | static char step_resume_break_shadow[BREAKPOINT_MAX]; |
| 234 | |
| 235 | /* Nonzero means the special breakpoint is a duplicate |
| 236 | so it has not itself been inserted. */ |
| 237 | |
| 238 | static int step_resume_break_duplicate; |
| 239 | |
| 240 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ |
| 241 | |
| 242 | static int trap_expected; |
| 243 | |
| 244 | /* Nonzero if the next time we try to continue the inferior, it will |
| 245 | step one instruction and generate a spurious trace trap. |
| 246 | This is used to compensate for a bug in HP-UX. */ |
| 247 | |
| 248 | static int trap_expected_after_continue; |
| 249 | |
| 250 | /* Nonzero means expecting a trace trap |
| 251 | and should stop the inferior and return silently when it happens. */ |
| 252 | |
| 253 | int stop_after_trap; |
| 254 | |
| 255 | /* Nonzero means expecting a trap and caller will handle it themselves. |
| 256 | It is used after attach, due to attaching to a process; |
| 257 | when running in the shell before the child program has been exec'd; |
| 258 | and when running some kinds of remote stuff (FIXME?). */ |
| 259 | |
| 260 | int stop_soon_quietly; |
| 261 | |
| 262 | /* Nonzero if pc has been changed by the debugger |
| 263 | since the inferior stopped. */ |
| 264 | |
| 265 | int pc_changed; |
| 266 | |
| 267 | /* Nonzero if proceed is being used for a "finish" command or a similar |
| 268 | situation when stop_registers should be saved. */ |
| 269 | |
| 270 | int proceed_to_finish; |
| 271 | |
| 272 | /* Save register contents here when about to pop a stack dummy frame, |
| 273 | if-and-only-if proceed_to_finish is set. |
| 274 | Thus this contains the return value from the called function (assuming |
| 275 | values are returned in a register). */ |
| 276 | |
| 277 | char stop_registers[REGISTER_BYTES]; |
| 278 | |
| 279 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ |
| 280 | |
| 281 | static int breakpoints_failed; |
| 282 | |
| 283 | /* Nonzero after stop if current stack frame should be printed. */ |
| 284 | |
| 285 | static int stop_print_frame; |
| 286 | |
| 287 | #ifdef NO_SINGLE_STEP |
| 288 | extern int one_stepped; /* From machine dependent code */ |
| 289 | extern void single_step (); /* Same. */ |
| 290 | #endif /* NO_SINGLE_STEP */ |
| 291 | |
| 292 | \f |
| 293 | /* Things to clean up if we QUIT out of resume (). */ |
| 294 | /* ARGSUSED */ |
| 295 | static void |
| 296 | resume_cleanups (arg) |
| 297 | int arg; |
| 298 | { |
| 299 | normal_stop (); |
| 300 | } |
| 301 | |
| 302 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
| 303 | wants to interrupt some lengthy single-stepping operation |
| 304 | (for child processes, the SIGINT goes to the inferior, and so |
| 305 | we get a SIGINT random_signal, but for remote debugging and perhaps |
| 306 | other targets, that's not true). |
| 307 | |
| 308 | STEP nonzero if we should step (zero to continue instead). |
| 309 | SIG is the signal to give the inferior (zero for none). */ |
| 310 | static void |
| 311 | resume (step, sig) |
| 312 | int step; |
| 313 | int sig; |
| 314 | { |
| 315 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
| 316 | QUIT; |
| 317 | |
| 318 | #ifdef NO_SINGLE_STEP |
| 319 | if (step) { |
| 320 | single_step(sig); /* Do it the hard way, w/temp breakpoints */ |
| 321 | step = 0; /* ...and don't ask hardware to do it. */ |
| 322 | } |
| 323 | #endif |
| 324 | |
| 325 | /* Handle any optimized stores to the inferior NOW... */ |
| 326 | #ifdef DO_DEFERRED_STORES |
| 327 | DO_DEFERRED_STORES; |
| 328 | #endif |
| 329 | |
| 330 | target_resume (step, sig); |
| 331 | discard_cleanups (old_cleanups); |
| 332 | } |
| 333 | |
| 334 | \f |
| 335 | /* Clear out all variables saying what to do when inferior is continued. |
| 336 | First do this, then set the ones you want, then call `proceed'. */ |
| 337 | |
| 338 | void |
| 339 | clear_proceed_status () |
| 340 | { |
| 341 | trap_expected = 0; |
| 342 | step_range_start = 0; |
| 343 | step_range_end = 0; |
| 344 | step_frame_address = 0; |
| 345 | step_over_calls = -1; |
| 346 | step_resume_break_address = 0; |
| 347 | stop_after_trap = 0; |
| 348 | stop_soon_quietly = 0; |
| 349 | proceed_to_finish = 0; |
| 350 | breakpoint_proceeded = 1; /* We're about to proceed... */ |
| 351 | |
| 352 | /* Discard any remaining commands or status from previous stop. */ |
| 353 | bpstat_clear (&stop_bpstat); |
| 354 | } |
| 355 | |
| 356 | /* Basic routine for continuing the program in various fashions. |
| 357 | |
| 358 | ADDR is the address to resume at, or -1 for resume where stopped. |
| 359 | SIGGNAL is the signal to give it, or 0 for none, |
| 360 | or -1 for act according to how it stopped. |
| 361 | STEP is nonzero if should trap after one instruction. |
| 362 | -1 means return after that and print nothing. |
| 363 | You should probably set various step_... variables |
| 364 | before calling here, if you are stepping. |
| 365 | |
| 366 | You should call clear_proceed_status before calling proceed. */ |
| 367 | |
| 368 | void |
| 369 | proceed (addr, siggnal, step) |
| 370 | CORE_ADDR addr; |
| 371 | int siggnal; |
| 372 | int step; |
| 373 | { |
| 374 | int oneproc = 0; |
| 375 | |
| 376 | if (step > 0) |
| 377 | step_start_function = find_pc_function (read_pc ()); |
| 378 | if (step < 0) |
| 379 | stop_after_trap = 1; |
| 380 | |
| 381 | if (addr == (CORE_ADDR)-1) |
| 382 | { |
| 383 | /* If there is a breakpoint at the address we will resume at, |
| 384 | step one instruction before inserting breakpoints |
| 385 | so that we do not stop right away. */ |
| 386 | |
| 387 | if (!pc_changed && breakpoint_here_p (read_pc ())) |
| 388 | oneproc = 1; |
| 389 | } |
| 390 | else |
| 391 | { |
| 392 | write_register (PC_REGNUM, addr); |
| 393 | #ifdef NPC_REGNUM |
| 394 | write_register (NPC_REGNUM, addr + 4); |
| 395 | #ifdef NNPC_REGNUM |
| 396 | write_register (NNPC_REGNUM, addr + 8); |
| 397 | #endif |
| 398 | #endif |
| 399 | } |
| 400 | |
| 401 | if (trap_expected_after_continue) |
| 402 | { |
| 403 | /* If (step == 0), a trap will be automatically generated after |
| 404 | the first instruction is executed. Force step one |
| 405 | instruction to clear this condition. This should not occur |
| 406 | if step is nonzero, but it is harmless in that case. */ |
| 407 | oneproc = 1; |
| 408 | trap_expected_after_continue = 0; |
| 409 | } |
| 410 | |
| 411 | if (oneproc) |
| 412 | /* We will get a trace trap after one instruction. |
| 413 | Continue it automatically and insert breakpoints then. */ |
| 414 | trap_expected = 1; |
| 415 | else |
| 416 | { |
| 417 | int temp = insert_breakpoints (); |
| 418 | if (temp) |
| 419 | { |
| 420 | print_sys_errmsg ("ptrace", temp); |
| 421 | error ("Cannot insert breakpoints.\n\ |
| 422 | The same program may be running in another process."); |
| 423 | } |
| 424 | breakpoints_inserted = 1; |
| 425 | } |
| 426 | |
| 427 | /* Install inferior's terminal modes. */ |
| 428 | target_terminal_inferior (); |
| 429 | |
| 430 | if (siggnal >= 0) |
| 431 | stop_signal = siggnal; |
| 432 | /* If this signal should not be seen by program, |
| 433 | give it zero. Used for debugging signals. */ |
| 434 | else if (stop_signal < NSIG && !signal_program[stop_signal]) |
| 435 | stop_signal= 0; |
| 436 | |
| 437 | /* Resume inferior. */ |
| 438 | resume (oneproc || step || bpstat_should_step (), stop_signal); |
| 439 | |
| 440 | /* Wait for it to stop (if not standalone) |
| 441 | and in any case decode why it stopped, and act accordingly. */ |
| 442 | |
| 443 | wait_for_inferior (); |
| 444 | normal_stop (); |
| 445 | } |
| 446 | |
| 447 | /* Record the pc and sp of the program the last time it stopped. |
| 448 | These are just used internally by wait_for_inferior, but need |
| 449 | to be preserved over calls to it and cleared when the inferior |
| 450 | is started. */ |
| 451 | static CORE_ADDR prev_pc; |
| 452 | static CORE_ADDR prev_sp; |
| 453 | static CORE_ADDR prev_func_start; |
| 454 | static char *prev_func_name; |
| 455 | |
| 456 | \f |
| 457 | /* Start an inferior Unix child process and sets inferior_pid to its pid. |
| 458 | EXEC_FILE is the file to run. |
| 459 | ALLARGS is a string containing the arguments to the program. |
| 460 | ENV is the environment vector to pass. Errors reported with error(). */ |
| 461 | |
| 462 | #ifndef SHELL_FILE |
| 463 | #define SHELL_FILE "/bin/sh" |
| 464 | #endif |
| 465 | |
| 466 | void |
| 467 | child_create_inferior (exec_file, allargs, env) |
| 468 | char *exec_file; |
| 469 | char *allargs; |
| 470 | char **env; |
| 471 | { |
| 472 | int pid; |
| 473 | char *shell_command; |
| 474 | char *shell_file; |
| 475 | static char default_shell_file[] = SHELL_FILE; |
| 476 | int len; |
| 477 | int pending_execs; |
| 478 | /* Set debug_fork then attach to the child while it sleeps, to debug. */ |
| 479 | static int debug_fork = 0; |
| 480 | /* This is set to the result of setpgrp, which if vforked, will be visible |
| 481 | to you in the parent process. It's only used by humans for debugging. */ |
| 482 | static int debug_setpgrp = 657473; |
| 483 | char **save_our_env; |
| 484 | |
| 485 | /* The user might want tilde-expansion, and in general probably wants |
| 486 | the program to behave the same way as if run from |
| 487 | his/her favorite shell. So we let the shell run it for us. |
| 488 | FIXME, this should probably search the local environment (as |
| 489 | modified by the setenv command), not the env gdb inherited. */ |
| 490 | shell_file = getenv ("SHELL"); |
| 491 | if (shell_file == NULL) |
| 492 | shell_file = default_shell_file; |
| 493 | |
| 494 | len = 5 + strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop*/ 10; |
| 495 | /* If desired, concat something onto the front of ALLARGS. |
| 496 | SHELL_COMMAND is the result. */ |
| 497 | #ifdef SHELL_COMMAND_CONCAT |
| 498 | shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + len); |
| 499 | strcpy (shell_command, SHELL_COMMAND_CONCAT); |
| 500 | #else |
| 501 | shell_command = (char *) alloca (len); |
| 502 | shell_command[0] = '\0'; |
| 503 | #endif |
| 504 | strcat (shell_command, "exec "); |
| 505 | strcat (shell_command, exec_file); |
| 506 | strcat (shell_command, " "); |
| 507 | strcat (shell_command, allargs); |
| 508 | |
| 509 | /* exec is said to fail if the executable is open. */ |
| 510 | close_exec_file (); |
| 511 | |
| 512 | /* Retain a copy of our environment variables, since the child will |
| 513 | replace the value of environ and if we're vforked, we have to |
| 514 | restore it. */ |
| 515 | save_our_env = environ; |
| 516 | |
| 517 | /* Tell the terminal handling subsystem what tty we plan to run on; |
| 518 | it will just record the information for later. */ |
| 519 | |
| 520 | new_tty_prefork (inferior_io_terminal); |
| 521 | |
| 522 | /* It is generally good practice to flush any possible pending stdio |
| 523 | output prior to doing a fork, to avoid the possibility of both the |
| 524 | parent and child flushing the same data after the fork. */ |
| 525 | |
| 526 | fflush (stdout); |
| 527 | fflush (stderr); |
| 528 | |
| 529 | #if defined(USG) && !defined(HAVE_VFORK) |
| 530 | pid = fork (); |
| 531 | #else |
| 532 | if (debug_fork) |
| 533 | pid = fork (); |
| 534 | else |
| 535 | pid = vfork (); |
| 536 | #endif |
| 537 | |
| 538 | if (pid < 0) |
| 539 | perror_with_name ("vfork"); |
| 540 | |
| 541 | if (pid == 0) |
| 542 | { |
| 543 | if (debug_fork) |
| 544 | sleep (debug_fork); |
| 545 | |
| 546 | #ifdef TIOCGPGRP |
| 547 | /* Run inferior in a separate process group. */ |
| 548 | #ifdef NEED_POSIX_SETPGID |
| 549 | debug_setpgrp = setpgid (0, 0); |
| 550 | #else |
| 551 | #if defined(USG) && !defined(SETPGRP_ARGS) |
| 552 | debug_setpgrp = setpgrp (); |
| 553 | #else |
| 554 | debug_setpgrp = setpgrp (getpid (), getpid ()); |
| 555 | #endif /* USG */ |
| 556 | #endif /* NEED_POSIX_SETPGID */ |
| 557 | if (debug_setpgrp == -1) |
| 558 | perror("setpgrp failed in child"); |
| 559 | #endif /* TIOCGPGRP */ |
| 560 | |
| 561 | #ifdef SET_STACK_LIMIT_HUGE |
| 562 | /* Reset the stack limit back to what it was. */ |
| 563 | { |
| 564 | struct rlimit rlim; |
| 565 | |
| 566 | getrlimit (RLIMIT_STACK, &rlim); |
| 567 | rlim.rlim_cur = original_stack_limit; |
| 568 | setrlimit (RLIMIT_STACK, &rlim); |
| 569 | } |
| 570 | #endif /* SET_STACK_LIMIT_HUGE */ |
| 571 | |
| 572 | /* Ask the tty subsystem to switch to the one we specified earlier |
| 573 | (or to share the current terminal, if none was specified). */ |
| 574 | |
| 575 | new_tty (); |
| 576 | |
| 577 | /* Changing the signal handlers for the inferior after |
| 578 | a vfork can also change them for the superior, so we don't mess |
| 579 | with signals here. See comments in |
| 580 | initialize_signals for how we get the right signal handlers |
| 581 | for the inferior. */ |
| 582 | |
| 583 | #ifdef USE_PROC_FS |
| 584 | /* Use SVR4 /proc interface */ |
| 585 | proc_set_exec_trap (); |
| 586 | #else |
| 587 | /* "Trace me, Dr. Memory!" */ |
| 588 | call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0); |
| 589 | #endif |
| 590 | |
| 591 | /* There is no execlpe call, so we have to set the environment |
| 592 | for our child in the global variable. If we've vforked, this |
| 593 | clobbers the parent, but environ is restored a few lines down |
| 594 | in the parent. By the way, yes we do need to look down the |
| 595 | path to find $SHELL. Rich Pixley says so, and I agree. */ |
| 596 | environ = env; |
| 597 | execlp (shell_file, shell_file, "-c", shell_command, (char *)0); |
| 598 | |
| 599 | fprintf (stderr, "Cannot exec %s: %s.\n", shell_file, |
| 600 | safe_strerror (errno)); |
| 601 | fflush (stderr); |
| 602 | _exit (0177); |
| 603 | } |
| 604 | |
| 605 | /* Restore our environment in case a vforked child clob'd it. */ |
| 606 | environ = save_our_env; |
| 607 | |
| 608 | /* Now that we have a child process, make it our target. */ |
| 609 | push_target (&child_ops); |
| 610 | |
| 611 | #ifdef CREATE_INFERIOR_HOOK |
| 612 | CREATE_INFERIOR_HOOK (pid); |
| 613 | #endif |
| 614 | |
| 615 | /* The process was started by the fork that created it, |
| 616 | but it will have stopped one instruction after execing the shell. |
| 617 | Here we must get it up to actual execution of the real program. */ |
| 618 | |
| 619 | inferior_pid = pid; /* Needed for wait_for_inferior stuff below */ |
| 620 | |
| 621 | clear_proceed_status (); |
| 622 | |
| 623 | /* We will get a trace trap after one instruction. |
| 624 | Continue it automatically. Eventually (after shell does an exec) |
| 625 | it will get another trace trap. Then insert breakpoints and continue. */ |
| 626 | |
| 627 | #ifdef START_INFERIOR_TRAPS_EXPECTED |
| 628 | pending_execs = START_INFERIOR_TRAPS_EXPECTED; |
| 629 | #else |
| 630 | pending_execs = 2; |
| 631 | #endif |
| 632 | |
| 633 | init_wait_for_inferior (); |
| 634 | |
| 635 | /* Set up the "saved terminal modes" of the inferior |
| 636 | based on what modes we are starting it with. */ |
| 637 | target_terminal_init (); |
| 638 | |
| 639 | /* Install inferior's terminal modes. */ |
| 640 | target_terminal_inferior (); |
| 641 | |
| 642 | while (1) |
| 643 | { |
| 644 | stop_soon_quietly = 1; /* Make wait_for_inferior be quiet */ |
| 645 | wait_for_inferior (); |
| 646 | if (stop_signal != SIGTRAP) |
| 647 | { |
| 648 | /* Let shell child handle its own signals in its own way */ |
| 649 | /* FIXME, what if child has exit()ed? Must exit loop somehow */ |
| 650 | resume (0, stop_signal); |
| 651 | } |
| 652 | else |
| 653 | { |
| 654 | /* We handle SIGTRAP, however; it means child did an exec. */ |
| 655 | if (0 == --pending_execs) |
| 656 | break; |
| 657 | resume (0, 0); /* Just make it go on */ |
| 658 | } |
| 659 | } |
| 660 | stop_soon_quietly = 0; |
| 661 | |
| 662 | /* We are now in the child process of interest, having exec'd the |
| 663 | correct program, and are poised at the first instruction of the |
| 664 | new program. */ |
| 665 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
| 666 | SOLIB_CREATE_INFERIOR_HOOK (pid); |
| 667 | #endif |
| 668 | |
| 669 | /* Should this perhaps just be a "proceed" call? FIXME */ |
| 670 | insert_step_breakpoint (); |
| 671 | breakpoints_failed = insert_breakpoints (); |
| 672 | if (!breakpoints_failed) |
| 673 | { |
| 674 | breakpoints_inserted = 1; |
| 675 | target_terminal_inferior(); |
| 676 | /* Start the child program going on its first instruction, single- |
| 677 | stepping if we need to. */ |
| 678 | resume (bpstat_should_step (), 0); |
| 679 | wait_for_inferior (); |
| 680 | normal_stop (); |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | /* Start remote-debugging of a machine over a serial link. */ |
| 685 | |
| 686 | void |
| 687 | start_remote () |
| 688 | { |
| 689 | init_wait_for_inferior (); |
| 690 | clear_proceed_status (); |
| 691 | stop_soon_quietly = 1; |
| 692 | trap_expected = 0; |
| 693 | wait_for_inferior (); |
| 694 | normal_stop (); |
| 695 | } |
| 696 | |
| 697 | /* Initialize static vars when a new inferior begins. */ |
| 698 | |
| 699 | void |
| 700 | init_wait_for_inferior () |
| 701 | { |
| 702 | /* These are meaningless until the first time through wait_for_inferior. */ |
| 703 | prev_pc = 0; |
| 704 | prev_sp = 0; |
| 705 | prev_func_start = 0; |
| 706 | prev_func_name = NULL; |
| 707 | |
| 708 | trap_expected_after_continue = 0; |
| 709 | breakpoints_inserted = 0; |
| 710 | mark_breakpoints_out (); |
| 711 | stop_signal = 0; /* Don't confuse first call to proceed(). */ |
| 712 | } |
| 713 | |
| 714 | |
| 715 | /* Attach to process PID, then initialize for debugging it |
| 716 | and wait for the trace-trap that results from attaching. */ |
| 717 | |
| 718 | void |
| 719 | child_attach (args, from_tty) |
| 720 | char *args; |
| 721 | int from_tty; |
| 722 | { |
| 723 | char *exec_file; |
| 724 | int pid; |
| 725 | |
| 726 | dont_repeat(); |
| 727 | |
| 728 | if (!args) |
| 729 | error_no_arg ("process-id to attach"); |
| 730 | |
| 731 | #ifndef ATTACH_DETACH |
| 732 | error ("Can't attach to a process on this machine."); |
| 733 | #else |
| 734 | pid = atoi (args); |
| 735 | |
| 736 | if (pid == getpid()) /* Trying to masturbate? */ |
| 737 | error ("I refuse to debug myself!"); |
| 738 | |
| 739 | if (target_has_execution) |
| 740 | { |
| 741 | if (query ("A program is being debugged already. Kill it? ")) |
| 742 | target_kill (); |
| 743 | else |
| 744 | error ("Inferior not killed."); |
| 745 | } |
| 746 | |
| 747 | exec_file = (char *) get_exec_file (1); |
| 748 | |
| 749 | if (from_tty) |
| 750 | { |
| 751 | printf ("Attaching program: %s pid %d\n", |
| 752 | exec_file, pid); |
| 753 | fflush (stdout); |
| 754 | } |
| 755 | |
| 756 | attach (pid); |
| 757 | inferior_pid = pid; |
| 758 | push_target (&child_ops); |
| 759 | |
| 760 | mark_breakpoints_out (); |
| 761 | target_terminal_init (); |
| 762 | clear_proceed_status (); |
| 763 | stop_soon_quietly = 1; |
| 764 | /*proceed (-1, 0, -2);*/ |
| 765 | target_terminal_inferior (); |
| 766 | wait_for_inferior (); |
| 767 | #ifdef SOLIB_ADD |
| 768 | SOLIB_ADD ((char *)0, from_tty, (struct target_ops *)0); |
| 769 | #endif |
| 770 | normal_stop (); |
| 771 | #endif /* ATTACH_DETACH */ |
| 772 | } |
| 773 | \f |
| 774 | /* Wait for control to return from inferior to debugger. |
| 775 | If inferior gets a signal, we may decide to start it up again |
| 776 | instead of returning. That is why there is a loop in this function. |
| 777 | When this function actually returns it means the inferior |
| 778 | should be left stopped and GDB should read more commands. */ |
| 779 | |
| 780 | void |
| 781 | wait_for_inferior () |
| 782 | { |
| 783 | WAITTYPE w; |
| 784 | int another_trap; |
| 785 | int random_signal; |
| 786 | CORE_ADDR stop_sp; |
| 787 | CORE_ADDR stop_func_start; |
| 788 | char *stop_func_name; |
| 789 | CORE_ADDR prologue_pc, tmp; |
| 790 | int stop_step_resume_break; |
| 791 | struct symtab_and_line sal; |
| 792 | int remove_breakpoints_on_following_step = 0; |
| 793 | int current_line; |
| 794 | int handling_longjmp = 0; /* FIXME */ |
| 795 | |
| 796 | sal = find_pc_line(prev_pc, 0); |
| 797 | current_line = sal.line; |
| 798 | |
| 799 | while (1) |
| 800 | { |
| 801 | /* Clean up saved state that will become invalid. */ |
| 802 | pc_changed = 0; |
| 803 | flush_cached_frames (); |
| 804 | registers_changed (); |
| 805 | |
| 806 | target_wait (&w); |
| 807 | |
| 808 | #ifdef SIGTRAP_STOP_AFTER_LOAD |
| 809 | |
| 810 | /* Somebody called load(2), and it gave us a "trap signal after load". |
| 811 | Ignore it gracefully. */ |
| 812 | |
| 813 | SIGTRAP_STOP_AFTER_LOAD (w); |
| 814 | #endif |
| 815 | |
| 816 | /* See if the process still exists; clean up if it doesn't. */ |
| 817 | if (WIFEXITED (w)) |
| 818 | { |
| 819 | target_terminal_ours (); /* Must do this before mourn anyway */ |
| 820 | if (WEXITSTATUS (w)) |
| 821 | printf_filtered ("\nProgram exited with code 0%o.\n", |
| 822 | (unsigned int)WEXITSTATUS (w)); |
| 823 | else |
| 824 | if (!batch_mode()) |
| 825 | printf_filtered ("\nProgram exited normally.\n"); |
| 826 | fflush (stdout); |
| 827 | target_mourn_inferior (); |
| 828 | #ifdef NO_SINGLE_STEP |
| 829 | one_stepped = 0; |
| 830 | #endif |
| 831 | stop_print_frame = 0; |
| 832 | break; |
| 833 | } |
| 834 | else if (!WIFSTOPPED (w)) |
| 835 | { |
| 836 | stop_print_frame = 0; |
| 837 | stop_signal = WTERMSIG (w); |
| 838 | target_terminal_ours (); /* Must do this before mourn anyway */ |
| 839 | target_kill (); /* kill mourns as well */ |
| 840 | #ifdef PRINT_RANDOM_SIGNAL |
| 841 | printf_filtered ("\nProgram terminated: "); |
| 842 | PRINT_RANDOM_SIGNAL (stop_signal); |
| 843 | #else |
| 844 | printf_filtered ("\nProgram terminated with signal %d, %s\n", |
| 845 | stop_signal, safe_strsignal (stop_signal)); |
| 846 | #endif |
| 847 | printf_filtered ("The inferior process no longer exists.\n"); |
| 848 | fflush (stdout); |
| 849 | #ifdef NO_SINGLE_STEP |
| 850 | one_stepped = 0; |
| 851 | #endif |
| 852 | break; |
| 853 | } |
| 854 | |
| 855 | #ifdef NO_SINGLE_STEP |
| 856 | if (one_stepped) |
| 857 | single_step (0); /* This actually cleans up the ss */ |
| 858 | #endif /* NO_SINGLE_STEP */ |
| 859 | |
| 860 | stop_pc = read_pc (); |
| 861 | set_current_frame ( create_new_frame (read_register (FP_REGNUM), |
| 862 | read_pc ())); |
| 863 | |
| 864 | stop_frame_address = FRAME_FP (get_current_frame ()); |
| 865 | stop_sp = read_register (SP_REGNUM); |
| 866 | stop_func_start = 0; |
| 867 | stop_func_name = 0; |
| 868 | /* Don't care about return value; stop_func_start and stop_func_name |
| 869 | will both be 0 if it doesn't work. */ |
| 870 | (void) find_pc_partial_function (stop_pc, &stop_func_name, |
| 871 | &stop_func_start); |
| 872 | stop_func_start += FUNCTION_START_OFFSET; |
| 873 | another_trap = 0; |
| 874 | bpstat_clear (&stop_bpstat); |
| 875 | stop_step = 0; |
| 876 | stop_stack_dummy = 0; |
| 877 | stop_print_frame = 1; |
| 878 | stop_step_resume_break = 0; |
| 879 | random_signal = 0; |
| 880 | stopped_by_random_signal = 0; |
| 881 | breakpoints_failed = 0; |
| 882 | |
| 883 | /* Look at the cause of the stop, and decide what to do. |
| 884 | The alternatives are: |
| 885 | 1) break; to really stop and return to the debugger, |
| 886 | 2) drop through to start up again |
| 887 | (set another_trap to 1 to single step once) |
| 888 | 3) set random_signal to 1, and the decision between 1 and 2 |
| 889 | will be made according to the signal handling tables. */ |
| 890 | |
| 891 | stop_signal = WSTOPSIG (w); |
| 892 | |
| 893 | /* First, distinguish signals caused by the debugger from signals |
| 894 | that have to do with the program's own actions. |
| 895 | Note that breakpoint insns may cause SIGTRAP or SIGILL |
| 896 | or SIGEMT, depending on the operating system version. |
| 897 | Here we detect when a SIGILL or SIGEMT is really a breakpoint |
| 898 | and change it to SIGTRAP. */ |
| 899 | |
| 900 | if (stop_signal == SIGTRAP |
| 901 | || (breakpoints_inserted && |
| 902 | (stop_signal == SIGILL |
| 903 | #ifdef SIGEMT |
| 904 | || stop_signal == SIGEMT |
| 905 | #endif |
| 906 | )) |
| 907 | || stop_soon_quietly) |
| 908 | { |
| 909 | if (stop_signal == SIGTRAP && stop_after_trap) |
| 910 | { |
| 911 | stop_print_frame = 0; |
| 912 | break; |
| 913 | } |
| 914 | if (stop_soon_quietly) |
| 915 | break; |
| 916 | |
| 917 | /* Don't even think about breakpoints |
| 918 | if just proceeded over a breakpoint. |
| 919 | |
| 920 | However, if we are trying to proceed over a breakpoint |
| 921 | and end up in sigtramp, then step_resume_break_address |
| 922 | will be set and we should check whether we've hit the |
| 923 | step breakpoint. */ |
| 924 | if (stop_signal == SIGTRAP && trap_expected |
| 925 | && step_resume_break_address == 0) |
| 926 | bpstat_clear (&stop_bpstat); |
| 927 | else |
| 928 | { |
| 929 | /* See if there is a breakpoint at the current PC. */ |
| 930 | #if DECR_PC_AFTER_BREAK |
| 931 | /* Notice the case of stepping through a jump |
| 932 | that lands just after a breakpoint. |
| 933 | Don't confuse that with hitting the breakpoint. |
| 934 | What we check for is that 1) stepping is going on |
| 935 | and 2) the pc before the last insn does not match |
| 936 | the address of the breakpoint before the current pc. */ |
| 937 | if (prev_pc == stop_pc - DECR_PC_AFTER_BREAK |
| 938 | || !step_range_end |
| 939 | || step_resume_break_address |
| 940 | || handling_longjmp /* FIXME */) |
| 941 | #endif /* DECR_PC_AFTER_BREAK not zero */ |
| 942 | { |
| 943 | /* See if we stopped at the special breakpoint for |
| 944 | stepping over a subroutine call. If both are zero, |
| 945 | this wasn't the reason for the stop. */ |
| 946 | if (step_resume_break_address |
| 947 | && stop_pc - DECR_PC_AFTER_BREAK |
| 948 | == step_resume_break_address) |
| 949 | { |
| 950 | stop_step_resume_break = 1; |
| 951 | if (DECR_PC_AFTER_BREAK) |
| 952 | { |
| 953 | stop_pc -= DECR_PC_AFTER_BREAK; |
| 954 | write_register (PC_REGNUM, stop_pc); |
| 955 | pc_changed = 0; |
| 956 | } |
| 957 | } |
| 958 | else |
| 959 | { |
| 960 | stop_bpstat = |
| 961 | bpstat_stop_status (&stop_pc, stop_frame_address); |
| 962 | /* Following in case break condition called a |
| 963 | function. */ |
| 964 | stop_print_frame = 1; |
| 965 | } |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | if (stop_signal == SIGTRAP) |
| 970 | random_signal |
| 971 | = !(bpstat_explains_signal (stop_bpstat) |
| 972 | || trap_expected |
| 973 | || stop_step_resume_break |
| 974 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
| 975 | || (step_range_end && !step_resume_break_address)); |
| 976 | else |
| 977 | { |
| 978 | random_signal |
| 979 | = !(bpstat_explains_signal (stop_bpstat) |
| 980 | || stop_step_resume_break |
| 981 | /* End of a stack dummy. Some systems (e.g. Sony |
| 982 | news) give another signal besides SIGTRAP, |
| 983 | so check here as well as above. */ |
| 984 | || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address) |
| 985 | ); |
| 986 | if (!random_signal) |
| 987 | stop_signal = SIGTRAP; |
| 988 | } |
| 989 | } |
| 990 | else |
| 991 | random_signal = 1; |
| 992 | |
| 993 | /* For the program's own signals, act according to |
| 994 | the signal handling tables. */ |
| 995 | |
| 996 | if (random_signal) |
| 997 | { |
| 998 | /* Signal not for debugging purposes. */ |
| 999 | int printed = 0; |
| 1000 | |
| 1001 | stopped_by_random_signal = 1; |
| 1002 | |
| 1003 | if (stop_signal >= NSIG |
| 1004 | || signal_print[stop_signal]) |
| 1005 | { |
| 1006 | printed = 1; |
| 1007 | target_terminal_ours_for_output (); |
| 1008 | #ifdef PRINT_RANDOM_SIGNAL |
| 1009 | PRINT_RANDOM_SIGNAL (stop_signal); |
| 1010 | #else |
| 1011 | printf_filtered ("\nProgram received signal %d, %s\n", |
| 1012 | stop_signal, safe_strsignal (stop_signal)); |
| 1013 | #endif /* PRINT_RANDOM_SIGNAL */ |
| 1014 | fflush (stdout); |
| 1015 | } |
| 1016 | if (stop_signal >= NSIG |
| 1017 | || signal_stop[stop_signal]) |
| 1018 | break; |
| 1019 | /* If not going to stop, give terminal back |
| 1020 | if we took it away. */ |
| 1021 | else if (printed) |
| 1022 | target_terminal_inferior (); |
| 1023 | |
| 1024 | /* Note that virtually all the code below does `if !random_signal'. |
| 1025 | Perhaps this code should end with a goto or continue. At least |
| 1026 | one (now fixed) bug was caused by this -- a !random_signal was |
| 1027 | missing in one of the tests below. */ |
| 1028 | } |
| 1029 | |
| 1030 | /* Handle cases caused by hitting a breakpoint. */ |
| 1031 | |
| 1032 | if (!random_signal) |
| 1033 | if (bpstat_explains_signal (stop_bpstat)) |
| 1034 | { |
| 1035 | CORE_ADDR jmp_buf_pc; |
| 1036 | |
| 1037 | switch (stop_bpstat->breakpoint_at->type) /* FIXME */ |
| 1038 | { |
| 1039 | /* If we hit the breakpoint at longjmp, disable it for the |
| 1040 | duration of this command. Then, install a temporary |
| 1041 | breakpoint at the target of the jmp_buf. */ |
| 1042 | case bp_longjmp: |
| 1043 | disable_longjmp_breakpoint(); |
| 1044 | remove_breakpoints (); |
| 1045 | breakpoints_inserted = 0; |
| 1046 | if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going; |
| 1047 | |
| 1048 | /* Need to blow away step-resume breakpoint, as it |
| 1049 | interferes with us */ |
| 1050 | remove_step_breakpoint (); |
| 1051 | step_resume_break_address = 0; |
| 1052 | stop_step_resume_break = 0; |
| 1053 | |
| 1054 | #if 0 /* FIXME - Need to implement nested temporary breakpoints */ |
| 1055 | if (step_over_calls > 0) |
| 1056 | set_longjmp_resume_breakpoint(jmp_buf_pc, |
| 1057 | get_current_frame()); |
| 1058 | else |
| 1059 | #endif /* 0 */ |
| 1060 | set_longjmp_resume_breakpoint(jmp_buf_pc, NULL); |
| 1061 | handling_longjmp = 1; /* FIXME */ |
| 1062 | goto keep_going; |
| 1063 | |
| 1064 | case bp_longjmp_resume: |
| 1065 | remove_breakpoints (); |
| 1066 | breakpoints_inserted = 0; |
| 1067 | #if 0 /* FIXME - Need to implement nested temporary breakpoints */ |
| 1068 | if (step_over_calls |
| 1069 | && (stop_frame_address |
| 1070 | INNER_THAN step_frame_address)) |
| 1071 | { |
| 1072 | another_trap = 1; |
| 1073 | goto keep_going; |
| 1074 | } |
| 1075 | #endif /* 0 */ |
| 1076 | disable_longjmp_breakpoint(); |
| 1077 | handling_longjmp = 0; /* FIXME */ |
| 1078 | break; |
| 1079 | |
| 1080 | default: |
| 1081 | fprintf(stderr, "Unknown breakpoint type %d\n", |
| 1082 | stop_bpstat->breakpoint_at->type); |
| 1083 | case bp_watchpoint: |
| 1084 | case bp_breakpoint: |
| 1085 | case bp_until: |
| 1086 | case bp_finish: |
| 1087 | /* Does a breakpoint want us to stop? */ |
| 1088 | if (bpstat_stop (stop_bpstat)) |
| 1089 | { |
| 1090 | stop_print_frame = bpstat_should_print (stop_bpstat); |
| 1091 | goto stop_stepping; |
| 1092 | } |
| 1093 | /* Otherwise, must remove breakpoints and single-step |
| 1094 | to get us past the one we hit. */ |
| 1095 | else |
| 1096 | { |
| 1097 | remove_breakpoints (); |
| 1098 | remove_step_breakpoint (); |
| 1099 | breakpoints_inserted = 0; |
| 1100 | another_trap = 1; |
| 1101 | } |
| 1102 | break; |
| 1103 | } |
| 1104 | } |
| 1105 | else if (stop_step_resume_break) |
| 1106 | { |
| 1107 | /* But if we have hit the step-resumption breakpoint, |
| 1108 | remove it. It has done its job getting us here. |
| 1109 | The sp test is to make sure that we don't get hung |
| 1110 | up in recursive calls in functions without frame |
| 1111 | pointers. If the stack pointer isn't outside of |
| 1112 | where the breakpoint was set (within a routine to be |
| 1113 | stepped over), we're in the middle of a recursive |
| 1114 | call. Not true for reg window machines (sparc) |
| 1115 | because the must change frames to call things and |
| 1116 | the stack pointer doesn't have to change if it |
| 1117 | the bp was set in a routine without a frame (pc can |
| 1118 | be stored in some other window). |
| 1119 | |
| 1120 | The removal of the sp test is to allow calls to |
| 1121 | alloca. Nasty things were happening. Oh, well, |
| 1122 | gdb can only handle one level deep of lack of |
| 1123 | frame pointer. */ |
| 1124 | |
| 1125 | /* |
| 1126 | Disable test for step_frame_address match so that we always stop even if the |
| 1127 | frames don't match. Reason: if we hit the step_resume_breakpoint, there is |
| 1128 | no way to temporarily disable it so that we can step past it. If we leave |
| 1129 | the breakpoint in, then we loop forever repeatedly hitting, but never |
| 1130 | getting past the breakpoint. This change keeps nexting over recursive |
| 1131 | function calls from hanging gdb. |
| 1132 | */ |
| 1133 | #if 0 |
| 1134 | if (* step_frame_address == 0 |
| 1135 | || (step_frame_address == stop_frame_address)) |
| 1136 | #endif |
| 1137 | { |
| 1138 | remove_step_breakpoint (); |
| 1139 | step_resume_break_address = 0; |
| 1140 | |
| 1141 | /* If were waiting for a trap, hitting the step_resume_break |
| 1142 | doesn't count as getting it. */ |
| 1143 | if (trap_expected) |
| 1144 | another_trap = 1; |
| 1145 | } |
| 1146 | } |
| 1147 | |
| 1148 | /* We come here if we hit a breakpoint but should not |
| 1149 | stop for it. Possibly we also were stepping |
| 1150 | and should stop for that. So fall through and |
| 1151 | test for stepping. But, if not stepping, |
| 1152 | do not stop. */ |
| 1153 | |
| 1154 | /* If this is the breakpoint at the end of a stack dummy, |
| 1155 | just stop silently. */ |
| 1156 | if (!random_signal |
| 1157 | && PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)) |
| 1158 | { |
| 1159 | stop_print_frame = 0; |
| 1160 | stop_stack_dummy = 1; |
| 1161 | #ifdef HP_OS_BUG |
| 1162 | trap_expected_after_continue = 1; |
| 1163 | #endif |
| 1164 | break; |
| 1165 | } |
| 1166 | |
| 1167 | if (step_resume_break_address) |
| 1168 | /* Having a step-resume breakpoint overrides anything |
| 1169 | else having to do with stepping commands until |
| 1170 | that breakpoint is reached. */ |
| 1171 | ; |
| 1172 | /* If stepping through a line, keep going if still within it. */ |
| 1173 | else if (!random_signal |
| 1174 | && step_range_end |
| 1175 | && stop_pc >= step_range_start |
| 1176 | && stop_pc < step_range_end |
| 1177 | /* The step range might include the start of the |
| 1178 | function, so if we are at the start of the |
| 1179 | step range and either the stack or frame pointers |
| 1180 | just changed, we've stepped outside */ |
| 1181 | && !(stop_pc == step_range_start |
| 1182 | && stop_frame_address |
| 1183 | && (stop_sp INNER_THAN prev_sp |
| 1184 | || stop_frame_address != step_frame_address))) |
| 1185 | { |
| 1186 | ; |
| 1187 | } |
| 1188 | |
| 1189 | /* We stepped out of the stepping range. See if that was due |
| 1190 | to a subroutine call that we should proceed to the end of. */ |
| 1191 | else if (!random_signal && step_range_end) |
| 1192 | { |
| 1193 | if (stop_func_start) |
| 1194 | { |
| 1195 | prologue_pc = stop_func_start; |
| 1196 | SKIP_PROLOGUE (prologue_pc); |
| 1197 | } |
| 1198 | |
| 1199 | /* Did we just take a signal? */ |
| 1200 | if (IN_SIGTRAMP (stop_pc, stop_func_name) |
| 1201 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) |
| 1202 | { |
| 1203 | /* This code is needed at least in the following case: |
| 1204 | The user types "next" and then a signal arrives (before |
| 1205 | the "next" is done). */ |
| 1206 | /* We've just taken a signal; go until we are back to |
| 1207 | the point where we took it and one more. */ |
| 1208 | step_resume_break_address = prev_pc; |
| 1209 | step_resume_break_duplicate = |
| 1210 | breakpoint_here_p (step_resume_break_address); |
| 1211 | if (breakpoints_inserted) |
| 1212 | insert_step_breakpoint (); |
| 1213 | /* Make sure that the stepping range gets us past |
| 1214 | that instruction. */ |
| 1215 | if (step_range_end == 1) |
| 1216 | step_range_end = (step_range_start = prev_pc) + 1; |
| 1217 | remove_breakpoints_on_following_step = 1; |
| 1218 | goto save_pc; |
| 1219 | } |
| 1220 | |
| 1221 | /* ==> See comments at top of file on this algorithm. <==*/ |
| 1222 | |
| 1223 | if ((stop_pc == stop_func_start |
| 1224 | || IN_SOLIB_TRAMPOLINE (stop_pc, stop_func_name)) |
| 1225 | && (stop_func_start != prev_func_start |
| 1226 | || prologue_pc != stop_func_start |
| 1227 | || stop_sp != prev_sp)) |
| 1228 | { |
| 1229 | /* It's a subroutine call. |
| 1230 | (0) If we are not stepping over any calls ("stepi"), we |
| 1231 | just stop. |
| 1232 | (1) If we're doing a "next", we want to continue through |
| 1233 | the call ("step over the call"). |
| 1234 | (2) If we are in a function-call trampoline (a stub between |
| 1235 | the calling routine and the real function), locate |
| 1236 | the real function and change stop_func_start. |
| 1237 | (3) If we're doing a "step", and there are no debug symbols |
| 1238 | at the target of the call, we want to continue through |
| 1239 | it ("step over the call"). |
| 1240 | (4) Otherwise, we want to stop soon, after the function |
| 1241 | prologue ("step into the call"). */ |
| 1242 | |
| 1243 | if (step_over_calls == 0) |
| 1244 | { |
| 1245 | /* I presume that step_over_calls is only 0 when we're |
| 1246 | supposed to be stepping at the assembly language level. */ |
| 1247 | stop_step = 1; |
| 1248 | break; |
| 1249 | } |
| 1250 | |
| 1251 | if (step_over_calls > 0) |
| 1252 | goto step_over_function; |
| 1253 | |
| 1254 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); |
| 1255 | if (tmp != 0) |
| 1256 | stop_func_start = tmp; |
| 1257 | |
| 1258 | if (find_pc_function (stop_func_start) != 0) |
| 1259 | goto step_into_function; |
| 1260 | |
| 1261 | step_over_function: |
| 1262 | /* A subroutine call has happened. */ |
| 1263 | /* Set a special breakpoint after the return */ |
| 1264 | step_resume_break_address = |
| 1265 | ADDR_BITS_REMOVE |
| 1266 | (SAVED_PC_AFTER_CALL (get_current_frame ())); |
| 1267 | step_resume_break_duplicate |
| 1268 | = breakpoint_here_p (step_resume_break_address); |
| 1269 | if (breakpoints_inserted) |
| 1270 | insert_step_breakpoint (); |
| 1271 | goto save_pc; |
| 1272 | |
| 1273 | step_into_function: |
| 1274 | /* Subroutine call with source code we should not step over. |
| 1275 | Do step to the first line of code in it. */ |
| 1276 | SKIP_PROLOGUE (stop_func_start); |
| 1277 | sal = find_pc_line (stop_func_start, 0); |
| 1278 | /* Use the step_resume_break to step until |
| 1279 | the end of the prologue, even if that involves jumps |
| 1280 | (as it seems to on the vax under 4.2). */ |
| 1281 | /* If the prologue ends in the middle of a source line, |
| 1282 | continue to the end of that source line. |
| 1283 | Otherwise, just go to end of prologue. */ |
| 1284 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
| 1285 | /* no, don't either. It skips any code that's |
| 1286 | legitimately on the first line. */ |
| 1287 | #else |
| 1288 | if (sal.end && sal.pc != stop_func_start) |
| 1289 | stop_func_start = sal.end; |
| 1290 | #endif |
| 1291 | |
| 1292 | if (stop_func_start == stop_pc) |
| 1293 | { |
| 1294 | /* We are already there: stop now. */ |
| 1295 | stop_step = 1; |
| 1296 | break; |
| 1297 | } |
| 1298 | else |
| 1299 | /* Put the step-breakpoint there and go until there. */ |
| 1300 | { |
| 1301 | step_resume_break_address = stop_func_start; |
| 1302 | |
| 1303 | step_resume_break_duplicate |
| 1304 | = breakpoint_here_p (step_resume_break_address); |
| 1305 | if (breakpoints_inserted) |
| 1306 | insert_step_breakpoint (); |
| 1307 | /* Do not specify what the fp should be when we stop |
| 1308 | since on some machines the prologue |
| 1309 | is where the new fp value is established. */ |
| 1310 | step_frame_address = 0; |
| 1311 | /* And make sure stepping stops right away then. */ |
| 1312 | step_range_end = step_range_start; |
| 1313 | } |
| 1314 | goto save_pc; |
| 1315 | } |
| 1316 | |
| 1317 | /* We've wandered out of the step range (but haven't done a |
| 1318 | subroutine call or return). */ |
| 1319 | |
| 1320 | sal = find_pc_line(stop_pc, 0); |
| 1321 | |
| 1322 | if (step_range_end == 1 || /* stepi or nexti */ |
| 1323 | sal.line == 0 || /* ...or no line # info */ |
| 1324 | (stop_pc == sal.pc /* ...or we're at the start */ |
| 1325 | && current_line != sal.line)) { /* of a different line */ |
| 1326 | /* Stop because we're done stepping. */ |
| 1327 | stop_step = 1; |
| 1328 | break; |
| 1329 | } else { |
| 1330 | /* We aren't done stepping, and we have line number info for $pc. |
| 1331 | Optimize by setting the step_range for the line. |
| 1332 | (We might not be in the original line, but if we entered a |
| 1333 | new line in mid-statement, we continue stepping. This makes |
| 1334 | things like for(;;) statements work better.) */ |
| 1335 | step_range_start = sal.pc; |
| 1336 | step_range_end = sal.end; |
| 1337 | goto save_pc; |
| 1338 | } |
| 1339 | /* We never fall through here */ |
| 1340 | } |
| 1341 | |
| 1342 | if (trap_expected |
| 1343 | && IN_SIGTRAMP (stop_pc, stop_func_name) |
| 1344 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) |
| 1345 | { |
| 1346 | /* What has happened here is that we have just stepped the inferior |
| 1347 | with a signal (because it is a signal which shouldn't make |
| 1348 | us stop), thus stepping into sigtramp. |
| 1349 | |
| 1350 | So we need to set a step_resume_break_address breakpoint |
| 1351 | and continue until we hit it, and then step. */ |
| 1352 | step_resume_break_address = prev_pc; |
| 1353 | /* Always 1, I think, but it's probably easier to have |
| 1354 | the step_resume_break as usual rather than trying to |
| 1355 | re-use the breakpoint which is already there. */ |
| 1356 | step_resume_break_duplicate = |
| 1357 | breakpoint_here_p (step_resume_break_address); |
| 1358 | if (breakpoints_inserted) |
| 1359 | insert_step_breakpoint (); |
| 1360 | remove_breakpoints_on_following_step = 1; |
| 1361 | another_trap = 1; |
| 1362 | } |
| 1363 | |
| 1364 | /* My apologies to the gods of structured programming. */ |
| 1365 | /* Come to this label when you need to resume the inferior. It's really much |
| 1366 | cleaner at this time to do a goto than to try and figure out what the |
| 1367 | if-else chain ought to look like!! */ |
| 1368 | |
| 1369 | keep_going: |
| 1370 | |
| 1371 | save_pc: |
| 1372 | /* Save the pc before execution, to compare with pc after stop. */ |
| 1373 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
| 1374 | prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER |
| 1375 | BREAK is defined, the |
| 1376 | original pc would not have |
| 1377 | been at the start of a |
| 1378 | function. */ |
| 1379 | prev_func_name = stop_func_name; |
| 1380 | prev_sp = stop_sp; |
| 1381 | |
| 1382 | /* If we did not do break;, it means we should keep |
| 1383 | running the inferior and not return to debugger. */ |
| 1384 | |
| 1385 | if (trap_expected && stop_signal != SIGTRAP) |
| 1386 | { |
| 1387 | /* We took a signal (which we are supposed to pass through to |
| 1388 | the inferior, else we'd have done a break above) and we |
| 1389 | haven't yet gotten our trap. Simply continue. */ |
| 1390 | resume ((step_range_end && !step_resume_break_address) |
| 1391 | || (trap_expected && !step_resume_break_address) |
| 1392 | || bpstat_should_step (), |
| 1393 | stop_signal); |
| 1394 | } |
| 1395 | else |
| 1396 | { |
| 1397 | /* Either the trap was not expected, but we are continuing |
| 1398 | anyway (the user asked that this signal be passed to the |
| 1399 | child) |
| 1400 | -- or -- |
| 1401 | The signal was SIGTRAP, e.g. it was our signal, but we |
| 1402 | decided we should resume from it. |
| 1403 | |
| 1404 | We're going to run this baby now! |
| 1405 | |
| 1406 | Insert breakpoints now, unless we are trying |
| 1407 | to one-proceed past a breakpoint. */ |
| 1408 | /* If we've just finished a special step resume and we don't |
| 1409 | want to hit a breakpoint, pull em out. */ |
| 1410 | if (!step_resume_break_address && |
| 1411 | remove_breakpoints_on_following_step) |
| 1412 | { |
| 1413 | remove_breakpoints_on_following_step = 0; |
| 1414 | remove_breakpoints (); |
| 1415 | breakpoints_inserted = 0; |
| 1416 | } |
| 1417 | else if (!breakpoints_inserted && |
| 1418 | (step_resume_break_address != 0 || !another_trap)) |
| 1419 | { |
| 1420 | insert_step_breakpoint (); |
| 1421 | breakpoints_failed = insert_breakpoints (); |
| 1422 | if (breakpoints_failed) |
| 1423 | break; |
| 1424 | breakpoints_inserted = 1; |
| 1425 | } |
| 1426 | |
| 1427 | trap_expected = another_trap; |
| 1428 | |
| 1429 | if (stop_signal == SIGTRAP) |
| 1430 | stop_signal = 0; |
| 1431 | |
| 1432 | #ifdef SHIFT_INST_REGS |
| 1433 | /* I'm not sure when this following segment applies. I do know, now, |
| 1434 | that we shouldn't rewrite the regs when we were stopped by a |
| 1435 | random signal from the inferior process. */ |
| 1436 | |
| 1437 | if (!bpstat_explains_signal (stop_bpstat) |
| 1438 | && (stop_signal != SIGCLD) |
| 1439 | && !stopped_by_random_signal) |
| 1440 | { |
| 1441 | CORE_ADDR pc_contents = read_register (PC_REGNUM); |
| 1442 | CORE_ADDR npc_contents = read_register (NPC_REGNUM); |
| 1443 | if (pc_contents != npc_contents) |
| 1444 | { |
| 1445 | write_register (NNPC_REGNUM, npc_contents); |
| 1446 | write_register (NPC_REGNUM, pc_contents); |
| 1447 | } |
| 1448 | } |
| 1449 | #endif /* SHIFT_INST_REGS */ |
| 1450 | |
| 1451 | resume ((!step_resume_break_address |
| 1452 | && !handling_longjmp |
| 1453 | && (step_range_end |
| 1454 | || trap_expected)) |
| 1455 | || bpstat_should_step (), |
| 1456 | stop_signal); |
| 1457 | } |
| 1458 | } |
| 1459 | |
| 1460 | stop_stepping: |
| 1461 | if (target_has_execution) |
| 1462 | { |
| 1463 | /* Assuming the inferior still exists, set these up for next |
| 1464 | time, just like we did above if we didn't break out of the |
| 1465 | loop. */ |
| 1466 | prev_pc = read_pc (); |
| 1467 | prev_func_start = stop_func_start; |
| 1468 | prev_func_name = stop_func_name; |
| 1469 | prev_sp = stop_sp; |
| 1470 | } |
| 1471 | } |
| 1472 | \f |
| 1473 | /* Here to return control to GDB when the inferior stops for real. |
| 1474 | Print appropriate messages, remove breakpoints, give terminal our modes. |
| 1475 | |
| 1476 | STOP_PRINT_FRAME nonzero means print the executing frame |
| 1477 | (pc, function, args, file, line number and line text). |
| 1478 | BREAKPOINTS_FAILED nonzero means stop was due to error |
| 1479 | attempting to insert breakpoints. */ |
| 1480 | |
| 1481 | void |
| 1482 | normal_stop () |
| 1483 | { |
| 1484 | /* Make sure that the current_frame's pc is correct. This |
| 1485 | is a correction for setting up the frame info before doing |
| 1486 | DECR_PC_AFTER_BREAK */ |
| 1487 | if (target_has_execution) |
| 1488 | (get_current_frame ())->pc = read_pc (); |
| 1489 | |
| 1490 | if (breakpoints_failed) |
| 1491 | { |
| 1492 | target_terminal_ours_for_output (); |
| 1493 | print_sys_errmsg ("ptrace", breakpoints_failed); |
| 1494 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
| 1495 | The same program may be running in another process.\n"); |
| 1496 | } |
| 1497 | |
| 1498 | if (target_has_execution) |
| 1499 | remove_step_breakpoint (); |
| 1500 | |
| 1501 | if (target_has_execution && breakpoints_inserted) |
| 1502 | if (remove_breakpoints ()) |
| 1503 | { |
| 1504 | target_terminal_ours_for_output (); |
| 1505 | printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\ |
| 1506 | It might be running in another process.\n\ |
| 1507 | Further execution is probably impossible.\n"); |
| 1508 | } |
| 1509 | |
| 1510 | breakpoints_inserted = 0; |
| 1511 | |
| 1512 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
| 1513 | Delete any breakpoint that is to be deleted at the next stop. */ |
| 1514 | |
| 1515 | breakpoint_auto_delete (stop_bpstat); |
| 1516 | |
| 1517 | /* If an auto-display called a function and that got a signal, |
| 1518 | delete that auto-display to avoid an infinite recursion. */ |
| 1519 | |
| 1520 | if (stopped_by_random_signal) |
| 1521 | disable_current_display (); |
| 1522 | |
| 1523 | if (step_multi && stop_step) |
| 1524 | return; |
| 1525 | |
| 1526 | target_terminal_ours (); |
| 1527 | |
| 1528 | if (!target_has_stack) |
| 1529 | return; |
| 1530 | |
| 1531 | /* Select innermost stack frame except on return from a stack dummy routine, |
| 1532 | or if the program has exited. Print it without a level number if |
| 1533 | we have changed functions or hit a breakpoint. Print source line |
| 1534 | if we have one. */ |
| 1535 | if (!stop_stack_dummy) |
| 1536 | { |
| 1537 | select_frame (get_current_frame (), 0); |
| 1538 | |
| 1539 | if (stop_print_frame) |
| 1540 | { |
| 1541 | int source_only; |
| 1542 | |
| 1543 | source_only = bpstat_print (stop_bpstat); |
| 1544 | source_only = source_only || |
| 1545 | ( stop_step |
| 1546 | && step_frame_address == stop_frame_address |
| 1547 | && step_start_function == find_pc_function (stop_pc)); |
| 1548 | |
| 1549 | print_stack_frame (selected_frame, -1, source_only? -1: 1); |
| 1550 | |
| 1551 | /* Display the auto-display expressions. */ |
| 1552 | do_displays (); |
| 1553 | } |
| 1554 | } |
| 1555 | |
| 1556 | /* Save the function value return registers, if we care. |
| 1557 | We might be about to restore their previous contents. */ |
| 1558 | if (proceed_to_finish) |
| 1559 | read_register_bytes (0, stop_registers, REGISTER_BYTES); |
| 1560 | |
| 1561 | if (stop_stack_dummy) |
| 1562 | { |
| 1563 | /* Pop the empty frame that contains the stack dummy. |
| 1564 | POP_FRAME ends with a setting of the current frame, so we |
| 1565 | can use that next. */ |
| 1566 | POP_FRAME; |
| 1567 | select_frame (get_current_frame (), 0); |
| 1568 | } |
| 1569 | } |
| 1570 | \f |
| 1571 | static void |
| 1572 | insert_step_breakpoint () |
| 1573 | { |
| 1574 | if (step_resume_break_address && !step_resume_break_duplicate) |
| 1575 | target_insert_breakpoint (step_resume_break_address, |
| 1576 | step_resume_break_shadow); |
| 1577 | } |
| 1578 | |
| 1579 | static void |
| 1580 | remove_step_breakpoint () |
| 1581 | { |
| 1582 | if (step_resume_break_address && !step_resume_break_duplicate) |
| 1583 | target_remove_breakpoint (step_resume_break_address, |
| 1584 | step_resume_break_shadow); |
| 1585 | } |
| 1586 | \f |
| 1587 | int signal_stop_state (signo) |
| 1588 | int signo; |
| 1589 | { |
| 1590 | return ((signo >= 0 && signo < NSIG) ? signal_stop[signo] : 0); |
| 1591 | } |
| 1592 | |
| 1593 | int signal_print_state (signo) |
| 1594 | int signo; |
| 1595 | { |
| 1596 | return ((signo >= 0 && signo < NSIG) ? signal_print[signo] : 0); |
| 1597 | } |
| 1598 | |
| 1599 | int signal_pass_state (signo) |
| 1600 | int signo; |
| 1601 | { |
| 1602 | return ((signo >= 0 && signo < NSIG) ? signal_program[signo] : 0); |
| 1603 | } |
| 1604 | |
| 1605 | static void |
| 1606 | sig_print_header () |
| 1607 | { |
| 1608 | printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n"); |
| 1609 | } |
| 1610 | |
| 1611 | static void |
| 1612 | sig_print_info (number) |
| 1613 | int number; |
| 1614 | { |
| 1615 | char *name; |
| 1616 | |
| 1617 | if ((name = strsigno (number)) == NULL) |
| 1618 | printf_filtered ("%d\t\t", number); |
| 1619 | else |
| 1620 | printf_filtered ("%s (%d)\t", name, number); |
| 1621 | printf_filtered ("%s\t", signal_stop[number] ? "Yes" : "No"); |
| 1622 | printf_filtered ("%s\t", signal_print[number] ? "Yes" : "No"); |
| 1623 | printf_filtered ("%s\t\t", signal_program[number] ? "Yes" : "No"); |
| 1624 | printf_filtered ("%s\n", safe_strsignal (number)); |
| 1625 | } |
| 1626 | |
| 1627 | /* Specify how various signals in the inferior should be handled. */ |
| 1628 | |
| 1629 | static void |
| 1630 | handle_command (args, from_tty) |
| 1631 | char *args; |
| 1632 | int from_tty; |
| 1633 | { |
| 1634 | register char *p = args; |
| 1635 | int signum = 0; |
| 1636 | register int digits, wordlen; |
| 1637 | char *nextarg; |
| 1638 | |
| 1639 | if (!args) |
| 1640 | error_no_arg ("signal to handle"); |
| 1641 | |
| 1642 | while (*p) |
| 1643 | { |
| 1644 | /* Find the end of the next word in the args. */ |
| 1645 | for (wordlen = 0; |
| 1646 | p[wordlen] && p[wordlen] != ' ' && p[wordlen] != '\t'; |
| 1647 | wordlen++); |
| 1648 | /* Set nextarg to the start of the word after the one we just |
| 1649 | found, and null-terminate this one. */ |
| 1650 | if (p[wordlen] == '\0') |
| 1651 | nextarg = p + wordlen; |
| 1652 | else |
| 1653 | { |
| 1654 | p[wordlen] = '\0'; |
| 1655 | nextarg = p + wordlen + 1; |
| 1656 | } |
| 1657 | |
| 1658 | |
| 1659 | for (digits = 0; p[digits] >= '0' && p[digits] <= '9'; digits++); |
| 1660 | |
| 1661 | if (signum == 0) |
| 1662 | { |
| 1663 | /* It is the first argument--must be the signal to operate on. */ |
| 1664 | if (digits == wordlen) |
| 1665 | { |
| 1666 | /* Numeric. */ |
| 1667 | signum = atoi (p); |
| 1668 | if (signum <= 0 || signum > signo_max ()) |
| 1669 | { |
| 1670 | p[wordlen] = '\0'; |
| 1671 | error ("Invalid signal %s given as argument to \"handle\".", p); |
| 1672 | } |
| 1673 | } |
| 1674 | else |
| 1675 | { |
| 1676 | /* Symbolic. */ |
| 1677 | signum = strtosigno (p); |
| 1678 | if (signum == 0) |
| 1679 | error ("No such signal \"%s\"", p); |
| 1680 | } |
| 1681 | |
| 1682 | if (signum == SIGTRAP || signum == SIGINT) |
| 1683 | { |
| 1684 | if (!query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum))) |
| 1685 | error ("Not confirmed."); |
| 1686 | } |
| 1687 | } |
| 1688 | /* Else, if already got a signal number, look for flag words |
| 1689 | saying what to do for it. */ |
| 1690 | else if (!strncmp (p, "stop", wordlen)) |
| 1691 | { |
| 1692 | signal_stop[signum] = 1; |
| 1693 | signal_print[signum] = 1; |
| 1694 | } |
| 1695 | else if (wordlen >= 2 && !strncmp (p, "print", wordlen)) |
| 1696 | signal_print[signum] = 1; |
| 1697 | else if (wordlen >= 2 && !strncmp (p, "pass", wordlen)) |
| 1698 | signal_program[signum] = 1; |
| 1699 | else if (!strncmp (p, "ignore", wordlen)) |
| 1700 | signal_program[signum] = 0; |
| 1701 | else if (wordlen >= 3 && !strncmp (p, "nostop", wordlen)) |
| 1702 | signal_stop[signum] = 0; |
| 1703 | else if (wordlen >= 4 && !strncmp (p, "noprint", wordlen)) |
| 1704 | { |
| 1705 | signal_print[signum] = 0; |
| 1706 | signal_stop[signum] = 0; |
| 1707 | } |
| 1708 | else if (wordlen >= 4 && !strncmp (p, "nopass", wordlen)) |
| 1709 | signal_program[signum] = 0; |
| 1710 | else if (wordlen >= 3 && !strncmp (p, "noignore", wordlen)) |
| 1711 | signal_program[signum] = 1; |
| 1712 | /* Not a number and not a recognized flag word => complain. */ |
| 1713 | else |
| 1714 | { |
| 1715 | error ("Unrecognized or ambiguous flag word: \"%s\".", p); |
| 1716 | } |
| 1717 | |
| 1718 | /* Find start of next word. */ |
| 1719 | p = nextarg; |
| 1720 | while (*p == ' ' || *p == '\t') p++; |
| 1721 | } |
| 1722 | |
| 1723 | NOTICE_SIGNAL_HANDLING_CHANGE; |
| 1724 | |
| 1725 | if (from_tty) |
| 1726 | { |
| 1727 | /* Show the results. */ |
| 1728 | sig_print_header (); |
| 1729 | sig_print_info (signum); |
| 1730 | } |
| 1731 | } |
| 1732 | |
| 1733 | /* Print current contents of the tables set by the handle command. */ |
| 1734 | |
| 1735 | static void |
| 1736 | signals_info (signum_exp, from_tty) |
| 1737 | char *signum_exp; |
| 1738 | int from_tty; |
| 1739 | { |
| 1740 | register int i; |
| 1741 | sig_print_header (); |
| 1742 | |
| 1743 | if (signum_exp) |
| 1744 | { |
| 1745 | /* First see if this is a symbol name. */ |
| 1746 | i = strtosigno (signum_exp); |
| 1747 | if (i == 0) |
| 1748 | { |
| 1749 | /* Nope, maybe it's an address which evaluates to a signal |
| 1750 | number. */ |
| 1751 | i = parse_and_eval_address (signum_exp); |
| 1752 | if (i >= NSIG || i < 0) |
| 1753 | error ("Signal number out of bounds."); |
| 1754 | } |
| 1755 | sig_print_info (i); |
| 1756 | return; |
| 1757 | } |
| 1758 | |
| 1759 | printf_filtered ("\n"); |
| 1760 | for (i = 0; i < NSIG; i++) |
| 1761 | { |
| 1762 | QUIT; |
| 1763 | |
| 1764 | sig_print_info (i); |
| 1765 | } |
| 1766 | |
| 1767 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); |
| 1768 | } |
| 1769 | \f |
| 1770 | /* Save all of the information associated with the inferior<==>gdb |
| 1771 | connection. INF_STATUS is a pointer to a "struct inferior_status" |
| 1772 | (defined in inferior.h). */ |
| 1773 | |
| 1774 | void |
| 1775 | save_inferior_status (inf_status, restore_stack_info) |
| 1776 | struct inferior_status *inf_status; |
| 1777 | int restore_stack_info; |
| 1778 | { |
| 1779 | inf_status->pc_changed = pc_changed; |
| 1780 | inf_status->stop_signal = stop_signal; |
| 1781 | inf_status->stop_pc = stop_pc; |
| 1782 | inf_status->stop_frame_address = stop_frame_address; |
| 1783 | inf_status->stop_step = stop_step; |
| 1784 | inf_status->stop_stack_dummy = stop_stack_dummy; |
| 1785 | inf_status->stopped_by_random_signal = stopped_by_random_signal; |
| 1786 | inf_status->trap_expected = trap_expected; |
| 1787 | inf_status->step_range_start = step_range_start; |
| 1788 | inf_status->step_range_end = step_range_end; |
| 1789 | inf_status->step_frame_address = step_frame_address; |
| 1790 | inf_status->step_over_calls = step_over_calls; |
| 1791 | inf_status->step_resume_break_address = step_resume_break_address; |
| 1792 | inf_status->stop_after_trap = stop_after_trap; |
| 1793 | inf_status->stop_soon_quietly = stop_soon_quietly; |
| 1794 | /* Save original bpstat chain here; replace it with copy of chain. |
| 1795 | If caller's caller is walking the chain, they'll be happier if we |
| 1796 | hand them back the original chain when restore_i_s is called. */ |
| 1797 | inf_status->stop_bpstat = stop_bpstat; |
| 1798 | stop_bpstat = bpstat_copy (stop_bpstat); |
| 1799 | inf_status->breakpoint_proceeded = breakpoint_proceeded; |
| 1800 | inf_status->restore_stack_info = restore_stack_info; |
| 1801 | inf_status->proceed_to_finish = proceed_to_finish; |
| 1802 | |
| 1803 | (void) memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
| 1804 | |
| 1805 | record_selected_frame (&(inf_status->selected_frame_address), |
| 1806 | &(inf_status->selected_level)); |
| 1807 | return; |
| 1808 | } |
| 1809 | |
| 1810 | void |
| 1811 | restore_inferior_status (inf_status) |
| 1812 | struct inferior_status *inf_status; |
| 1813 | { |
| 1814 | FRAME fid; |
| 1815 | int level = inf_status->selected_level; |
| 1816 | |
| 1817 | pc_changed = inf_status->pc_changed; |
| 1818 | stop_signal = inf_status->stop_signal; |
| 1819 | stop_pc = inf_status->stop_pc; |
| 1820 | stop_frame_address = inf_status->stop_frame_address; |
| 1821 | stop_step = inf_status->stop_step; |
| 1822 | stop_stack_dummy = inf_status->stop_stack_dummy; |
| 1823 | stopped_by_random_signal = inf_status->stopped_by_random_signal; |
| 1824 | trap_expected = inf_status->trap_expected; |
| 1825 | step_range_start = inf_status->step_range_start; |
| 1826 | step_range_end = inf_status->step_range_end; |
| 1827 | step_frame_address = inf_status->step_frame_address; |
| 1828 | step_over_calls = inf_status->step_over_calls; |
| 1829 | step_resume_break_address = inf_status->step_resume_break_address; |
| 1830 | stop_after_trap = inf_status->stop_after_trap; |
| 1831 | stop_soon_quietly = inf_status->stop_soon_quietly; |
| 1832 | bpstat_clear (&stop_bpstat); |
| 1833 | stop_bpstat = inf_status->stop_bpstat; |
| 1834 | breakpoint_proceeded = inf_status->breakpoint_proceeded; |
| 1835 | proceed_to_finish = inf_status->proceed_to_finish; |
| 1836 | |
| 1837 | (void) memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
| 1838 | |
| 1839 | /* The inferior can be gone if the user types "print exit(0)" |
| 1840 | (and perhaps other times). */ |
| 1841 | if (target_has_stack && inf_status->restore_stack_info) |
| 1842 | { |
| 1843 | fid = find_relative_frame (get_current_frame (), |
| 1844 | &level); |
| 1845 | |
| 1846 | /* If inf_status->selected_frame_address is NULL, there was no |
| 1847 | previously selected frame. */ |
| 1848 | if (fid == 0 || |
| 1849 | FRAME_FP (fid) != inf_status->selected_frame_address || |
| 1850 | level != 0) |
| 1851 | { |
| 1852 | #if 1 |
| 1853 | /* I'm not sure this error message is a good idea. I have |
| 1854 | only seen it occur after "Can't continue previously |
| 1855 | requested operation" (we get called from do_cleanups), in |
| 1856 | which case it just adds insult to injury (one confusing |
| 1857 | error message after another. Besides which, does the |
| 1858 | user really care if we can't restore the previously |
| 1859 | selected frame? */ |
| 1860 | fprintf (stderr, "Unable to restore previously selected frame.\n"); |
| 1861 | #endif |
| 1862 | select_frame (get_current_frame (), 0); |
| 1863 | return; |
| 1864 | } |
| 1865 | |
| 1866 | select_frame (fid, inf_status->selected_level); |
| 1867 | } |
| 1868 | } |
| 1869 | |
| 1870 | \f |
| 1871 | void |
| 1872 | _initialize_infrun () |
| 1873 | { |
| 1874 | register int i; |
| 1875 | register int numsigs; |
| 1876 | |
| 1877 | add_info ("signals", signals_info, |
| 1878 | "What debugger does when program gets various signals.\n\ |
| 1879 | Specify a signal number as argument to print info on that signal only."); |
| 1880 | |
| 1881 | add_com ("handle", class_run, handle_command, |
| 1882 | "Specify how to handle a signal.\n\ |
| 1883 | Args are signal number followed by flags.\n\ |
| 1884 | Flags allowed are \"stop\", \"print\", \"pass\",\n\ |
| 1885 | \"nostop\", \"noprint\" or \"nopass\".\n\ |
| 1886 | Print means print a message if this signal happens.\n\ |
| 1887 | Stop means reenter debugger if this signal happens (implies print).\n\ |
| 1888 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
| 1889 | Pass and Stop may be combined."); |
| 1890 | |
| 1891 | numsigs = signo_max () + 1; |
| 1892 | signal_stop = xmalloc (sizeof (signal_stop[0]) * numsigs); |
| 1893 | signal_print = xmalloc (sizeof (signal_print[0]) * numsigs); |
| 1894 | signal_program = xmalloc (sizeof (signal_program[0]) * numsigs); |
| 1895 | for (i = 0; i < numsigs; i++) |
| 1896 | { |
| 1897 | signal_stop[i] = 1; |
| 1898 | signal_print[i] = 1; |
| 1899 | signal_program[i] = 1; |
| 1900 | } |
| 1901 | |
| 1902 | /* Signals caused by debugger's own actions |
| 1903 | should not be given to the program afterwards. */ |
| 1904 | signal_program[SIGTRAP] = 0; |
| 1905 | signal_program[SIGINT] = 0; |
| 1906 | |
| 1907 | /* Signals that are not errors should not normally enter the debugger. */ |
| 1908 | #ifdef SIGALRM |
| 1909 | signal_stop[SIGALRM] = 0; |
| 1910 | signal_print[SIGALRM] = 0; |
| 1911 | #endif /* SIGALRM */ |
| 1912 | #ifdef SIGVTALRM |
| 1913 | signal_stop[SIGVTALRM] = 0; |
| 1914 | signal_print[SIGVTALRM] = 0; |
| 1915 | #endif /* SIGVTALRM */ |
| 1916 | #ifdef SIGPROF |
| 1917 | signal_stop[SIGPROF] = 0; |
| 1918 | signal_print[SIGPROF] = 0; |
| 1919 | #endif /* SIGPROF */ |
| 1920 | #ifdef SIGCHLD |
| 1921 | signal_stop[SIGCHLD] = 0; |
| 1922 | signal_print[SIGCHLD] = 0; |
| 1923 | #endif /* SIGCHLD */ |
| 1924 | #ifdef SIGCLD |
| 1925 | signal_stop[SIGCLD] = 0; |
| 1926 | signal_print[SIGCLD] = 0; |
| 1927 | #endif /* SIGCLD */ |
| 1928 | #ifdef SIGIO |
| 1929 | signal_stop[SIGIO] = 0; |
| 1930 | signal_print[SIGIO] = 0; |
| 1931 | #endif /* SIGIO */ |
| 1932 | #ifdef SIGURG |
| 1933 | signal_stop[SIGURG] = 0; |
| 1934 | signal_print[SIGURG] = 0; |
| 1935 | #endif /* SIGURG */ |
| 1936 | } |