| 1 | /*- |
| 2 | * This code is derived from software copyrighted by the Free Software |
| 3 | * Foundation. |
| 4 | * |
| 5 | * Modified 1991 by Donn Seeley at UUNET Technologies, Inc. |
| 6 | * Modified 1990 by Van Jacobson at Lawrence Berkeley Laboratory. |
| 7 | */ |
| 8 | |
| 9 | #ifndef lint |
| 10 | static char sccsid[] = "@(#)infrun.c 6.4 (Berkeley) 5/8/91"; |
| 11 | #endif /* not lint */ |
| 12 | |
| 13 | /* Start and stop the inferior process, for GDB. |
| 14 | Copyright (C) 1986, 1987, 1988, 1989 Free Software Foundation, Inc. |
| 15 | |
| 16 | This file is part of GDB. |
| 17 | |
| 18 | GDB is free software; you can redistribute it and/or modify |
| 19 | it under the terms of the GNU General Public License as published by |
| 20 | the Free Software Foundation; either version 1, or (at your option) |
| 21 | any later version. |
| 22 | |
| 23 | GDB is distributed in the hope that it will be useful, |
| 24 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 25 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 26 | GNU General Public License for more details. |
| 27 | |
| 28 | You should have received a copy of the GNU General Public License |
| 29 | along with GDB; see the file COPYING. If not, write to |
| 30 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 31 | |
| 32 | /* Notes on the algorithm used in wait_for_inferior to determine if we |
| 33 | just did a subroutine call when stepping. We have the following |
| 34 | information at that point: |
| 35 | |
| 36 | Current and previous (just before this step) pc. |
| 37 | Current and previous sp. |
| 38 | Current and previous start of current function. |
| 39 | |
| 40 | If the start's of the functions don't match, then |
| 41 | |
| 42 | a) We did a subroutine call. |
| 43 | |
| 44 | In this case, the pc will be at the beginning of a function. |
| 45 | |
| 46 | b) We did a subroutine return. |
| 47 | |
| 48 | Otherwise. |
| 49 | |
| 50 | c) We did a longjmp. |
| 51 | |
| 52 | If we did a longjump, we were doing "nexti", since a next would |
| 53 | have attempted to skip over the assembly language routine in which |
| 54 | the longjmp is coded and would have simply been the equivalent of a |
| 55 | continue. I consider this ok behaivior. We'd like one of two |
| 56 | things to happen if we are doing a nexti through the longjmp() |
| 57 | routine: 1) It behaves as a stepi, or 2) It acts like a continue as |
| 58 | above. Given that this is a special case, and that anybody who |
| 59 | thinks that the concept of sub calls is meaningful in the context |
| 60 | of a longjmp, I'll take either one. Let's see what happens. |
| 61 | |
| 62 | Acts like a subroutine return. I can handle that with no problem |
| 63 | at all. |
| 64 | |
| 65 | -->So: If the current and previous beginnings of the current |
| 66 | function don't match, *and* the pc is at the start of a function, |
| 67 | we've done a subroutine call. If the pc is not at the start of a |
| 68 | function, we *didn't* do a subroutine call. |
| 69 | |
| 70 | -->If the beginnings of the current and previous function do match, |
| 71 | either: |
| 72 | |
| 73 | a) We just did a recursive call. |
| 74 | |
| 75 | In this case, we would be at the very beginning of a |
| 76 | function and 1) it will have a prologue (don't jump to |
| 77 | before prologue, or 2) (we assume here that it doesn't have |
| 78 | a prologue) there will have been a change in the stack |
| 79 | pointer over the last instruction. (Ie. it's got to put |
| 80 | the saved pc somewhere. The stack is the usual place. In |
| 81 | a recursive call a register is only an option if there's a |
| 82 | prologue to do something with it. This is even true on |
| 83 | register window machines; the prologue sets up the new |
| 84 | window. It might not be true on a register window machine |
| 85 | where the call instruction moved the register window |
| 86 | itself. Hmmm. One would hope that the stack pointer would |
| 87 | also change. If it doesn't, somebody send me a note, and |
| 88 | I'll work out a more general theory. |
| 89 | randy@wheaties.ai.mit.edu). This is true (albeit slipperly |
| 90 | so) on all machines I'm aware of: |
| 91 | |
| 92 | m68k: Call changes stack pointer. Regular jumps don't. |
| 93 | |
| 94 | sparc: Recursive calls must have frames and therefor, |
| 95 | prologues. |
| 96 | |
| 97 | vax: All calls have frames and hence change the |
| 98 | stack pointer. |
| 99 | |
| 100 | b) We did a return from a recursive call. I don't see that we |
| 101 | have either the ability or the need to distinguish this |
| 102 | from an ordinary jump. The stack frame will be printed |
| 103 | when and if the frame pointer changes; if we are in a |
| 104 | function without a frame pointer, it's the users own |
| 105 | lookout. |
| 106 | |
| 107 | c) We did a jump within a function. We assume that this is |
| 108 | true if we didn't do a recursive call. |
| 109 | |
| 110 | d) We are in no-man's land ("I see no symbols here"). We |
| 111 | don't worry about this; it will make calls look like simple |
| 112 | jumps (and the stack frames will be printed when the frame |
| 113 | pointer moves), which is a reasonably non-violent response. |
| 114 | |
| 115 | #if 0 |
| 116 | We skip this; it causes more problems than it's worth. |
| 117 | #ifdef SUN4_COMPILER_FEATURE |
| 118 | We do a special ifdef for the sun 4, forcing it to single step |
| 119 | into calls which don't have prologues. This means that we can't |
| 120 | nexti over leaf nodes, we can probably next over them (since they |
| 121 | won't have debugging symbols, usually), and we can next out of |
| 122 | functions returning structures (with a "call .stret4" at the end). |
| 123 | #endif |
| 124 | #endif |
| 125 | */ |
| 126 | |
| 127 | |
| 128 | |
| 129 | |
| 130 | |
| 131 | #include <stdio.h> |
| 132 | #include "defs.h" |
| 133 | #include "param.h" |
| 134 | #include "symtab.h" |
| 135 | #include "frame.h" |
| 136 | #include "inferior.h" |
| 137 | #include "wait.h" |
| 138 | |
| 139 | #include <signal.h> |
| 140 | |
| 141 | /* unistd.h is needed to #define X_OK */ |
| 142 | #ifdef USG |
| 143 | #include <unistd.h> |
| 144 | #else |
| 145 | #include <sys/file.h> |
| 146 | #endif |
| 147 | |
| 148 | #ifdef UMAX_PTRACE |
| 149 | #include <aouthdr.h> |
| 150 | #include <sys/param.h> |
| 151 | #include <sys/ptrace.h> |
| 152 | #endif /* UMAX_PTRACE */ |
| 153 | |
| 154 | /* Required by <sys/user.h>. */ |
| 155 | #include <sys/types.h> |
| 156 | /* Required by <sys/user.h>, at least on system V. */ |
| 157 | #include <sys/dir.h> |
| 158 | /* Needed by IN_SIGTRAMP on some machines (e.g. vax). */ |
| 159 | #include <sys/param.h> |
| 160 | /* Needed by IN_SIGTRAMP on some machines (e.g. vax). */ |
| 161 | #include <sys/user.h> |
| 162 | |
| 163 | extern char *sys_siglist[]; |
| 164 | extern int errno; |
| 165 | |
| 166 | /* Sigtramp is a routine that the kernel calls (which then calls the |
| 167 | signal handler). On most machines it is a library routine that |
| 168 | is linked into the executable. |
| 169 | |
| 170 | This macro, given a program counter value and the name of the |
| 171 | function in which that PC resides (which can be null if the |
| 172 | name is not known), returns nonzero if the PC and name show |
| 173 | that we are in sigtramp. |
| 174 | |
| 175 | On most machines just see if the name is sigtramp (and if we have |
| 176 | no name, assume we are not in sigtramp). */ |
| 177 | #if !defined (IN_SIGTRAMP) |
| 178 | #define IN_SIGTRAMP(pc, name) \ |
| 179 | name && !strcmp ("_sigtramp", name) |
| 180 | #endif |
| 181 | |
| 182 | /* Tables of how to react to signals; the user sets them. */ |
| 183 | |
| 184 | static char signal_stop[NSIG]; |
| 185 | static char signal_print[NSIG]; |
| 186 | static char signal_program[NSIG]; |
| 187 | |
| 188 | /* Nonzero if breakpoints are now inserted in the inferior. */ |
| 189 | |
| 190 | static int breakpoints_inserted; |
| 191 | |
| 192 | /* Function inferior was in as of last step command. */ |
| 193 | |
| 194 | static struct symbol *step_start_function; |
| 195 | |
| 196 | /* This is the sequence of bytes we insert for a breakpoint. */ |
| 197 | |
| 198 | static char break_insn[] = BREAKPOINT; |
| 199 | |
| 200 | /* Nonzero => address for special breakpoint for resuming stepping. */ |
| 201 | |
| 202 | static CORE_ADDR step_resume_break_address; |
| 203 | |
| 204 | /* Original contents of the byte where the special breakpoint is. */ |
| 205 | |
| 206 | static char step_resume_break_shadow[sizeof break_insn]; |
| 207 | |
| 208 | /* Nonzero means the special breakpoint is a duplicate |
| 209 | so it has not itself been inserted. */ |
| 210 | |
| 211 | static int step_resume_break_duplicate; |
| 212 | |
| 213 | /* Nonzero if we are expecting a trace trap and should proceed from it. |
| 214 | 2 means expecting 2 trace traps and should continue both times. |
| 215 | That occurs when we tell sh to exec the program: we will get |
| 216 | a trap after the exec of sh and a second when the program is exec'd. */ |
| 217 | |
| 218 | static int trap_expected; |
| 219 | |
| 220 | /* Nonzero if the next time we try to continue the inferior, it will |
| 221 | step one instruction and generate a spurious trace trap. |
| 222 | This is used to compensate for a bug in HP-UX. */ |
| 223 | |
| 224 | static int trap_expected_after_continue; |
| 225 | |
| 226 | /* Nonzero means expecting a trace trap |
| 227 | and should stop the inferior and return silently when it happens. */ |
| 228 | |
| 229 | int stop_after_trap; |
| 230 | |
| 231 | /* Nonzero means expecting a trace trap due to attaching to a process. */ |
| 232 | |
| 233 | int stop_after_attach; |
| 234 | |
| 235 | /* Nonzero if pc has been changed by the debugger |
| 236 | since the inferior stopped. */ |
| 237 | |
| 238 | int pc_changed; |
| 239 | |
| 240 | /* Nonzero if debugging a remote machine via a serial link or ethernet. */ |
| 241 | |
| 242 | int remote_debugging; |
| 243 | |
| 244 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ |
| 245 | |
| 246 | static int breakpoints_failed; |
| 247 | |
| 248 | /* Nonzero if inferior is in sh before our program got exec'd. */ |
| 249 | |
| 250 | static int running_in_shell; |
| 251 | |
| 252 | /* Nonzero after stop if current stack frame should be printed. */ |
| 253 | |
| 254 | static int stop_print_frame; |
| 255 | |
| 256 | #ifdef NO_SINGLE_STEP |
| 257 | extern int one_stepped; /* From machine dependent code */ |
| 258 | extern void single_step (); /* Same. */ |
| 259 | #endif /* NO_SINGLE_STEP */ |
| 260 | |
| 261 | static void insert_step_breakpoint (); |
| 262 | static void remove_step_breakpoint (); |
| 263 | static void wait_for_inferior (); |
| 264 | static void normal_stop (); |
| 265 | |
| 266 | \f |
| 267 | /* Clear out all variables saying what to do when inferior is continued. |
| 268 | First do this, then set the ones you want, then call `proceed'. */ |
| 269 | |
| 270 | void |
| 271 | clear_proceed_status () |
| 272 | { |
| 273 | trap_expected = 0; |
| 274 | step_range_start = 0; |
| 275 | step_range_end = 0; |
| 276 | step_frame_address = 0; |
| 277 | step_over_calls = -1; |
| 278 | step_resume_break_address = 0; |
| 279 | stop_after_trap = 0; |
| 280 | stop_after_attach = 0; |
| 281 | |
| 282 | /* Discard any remaining commands left by breakpoint we had stopped at. */ |
| 283 | clear_breakpoint_commands (); |
| 284 | } |
| 285 | |
| 286 | /* Basic routine for continuing the program in various fashions. |
| 287 | |
| 288 | ADDR is the address to resume at, or -1 for resume where stopped. |
| 289 | SIGNAL is the signal to give it, or 0 for none, |
| 290 | or -1 for act according to how it stopped. |
| 291 | STEP is nonzero if should trap after one instruction. |
| 292 | -1 means return after that and print nothing. |
| 293 | You should probably set various step_... variables |
| 294 | before calling here, if you are stepping. |
| 295 | |
| 296 | You should call clear_proceed_status before calling proceed. */ |
| 297 | |
| 298 | void |
| 299 | proceed (addr, signal, step) |
| 300 | CORE_ADDR addr; |
| 301 | int signal; |
| 302 | int step; |
| 303 | { |
| 304 | int oneproc = 0; |
| 305 | |
| 306 | if (step > 0) |
| 307 | step_start_function = find_pc_function (read_pc ()); |
| 308 | if (step < 0) |
| 309 | stop_after_trap = 1; |
| 310 | |
| 311 | if (addr == -1) |
| 312 | { |
| 313 | /* If there is a breakpoint at the address we will resume at, |
| 314 | step one instruction before inserting breakpoints |
| 315 | so that we do not stop right away. */ |
| 316 | |
| 317 | if (!pc_changed && breakpoint_here_p (read_pc ())) |
| 318 | oneproc = 1; |
| 319 | } |
| 320 | else |
| 321 | { |
| 322 | write_register (PC_REGNUM, addr); |
| 323 | #ifdef NPC_REGNUM |
| 324 | write_register (NPC_REGNUM, addr + 4); |
| 325 | #endif |
| 326 | } |
| 327 | |
| 328 | if (trap_expected_after_continue) |
| 329 | { |
| 330 | /* If (step == 0), a trap will be automatically generated after |
| 331 | the first instruction is executed. Force step one |
| 332 | instruction to clear this condition. This should not occur |
| 333 | if step is nonzero, but it is harmless in that case. */ |
| 334 | oneproc = 1; |
| 335 | trap_expected_after_continue = 0; |
| 336 | } |
| 337 | |
| 338 | if (oneproc) |
| 339 | /* We will get a trace trap after one instruction. |
| 340 | Continue it automatically and insert breakpoints then. */ |
| 341 | trap_expected = 1; |
| 342 | else |
| 343 | { |
| 344 | int temp = insert_breakpoints (); |
| 345 | if (temp) |
| 346 | { |
| 347 | print_sys_errmsg ("ptrace", temp); |
| 348 | error ("Cannot insert breakpoints.\n\ |
| 349 | The same program may be running in another process."); |
| 350 | } |
| 351 | breakpoints_inserted = 1; |
| 352 | } |
| 353 | |
| 354 | /* Install inferior's terminal modes. */ |
| 355 | terminal_inferior (); |
| 356 | |
| 357 | if (signal >= 0) |
| 358 | stop_signal = signal; |
| 359 | /* If this signal should not be seen by program, |
| 360 | give it zero. Used for debugging signals. */ |
| 361 | else if (stop_signal < NSIG && !signal_program[stop_signal]) |
| 362 | stop_signal= 0; |
| 363 | |
| 364 | /* Resume inferior. */ |
| 365 | resume (oneproc || step, stop_signal); |
| 366 | |
| 367 | /* Wait for it to stop (if not standalone) |
| 368 | and in any case decode why it stopped, and act accordingly. */ |
| 369 | |
| 370 | wait_for_inferior (); |
| 371 | normal_stop (); |
| 372 | } |
| 373 | |
| 374 | /* Writing the inferior pc as a register calls this function |
| 375 | to inform infrun that the pc has been set in the debugger. */ |
| 376 | |
| 377 | void |
| 378 | writing_pc (val) |
| 379 | CORE_ADDR val; |
| 380 | { |
| 381 | stop_pc = val; |
| 382 | pc_changed = 1; |
| 383 | } |
| 384 | |
| 385 | /* Start an inferior process for the first time. |
| 386 | Actually it was started by the fork that created it, |
| 387 | but it will have stopped one instruction after execing sh. |
| 388 | Here we must get it up to actual execution of the real program. */ |
| 389 | |
| 390 | void |
| 391 | start_inferior () |
| 392 | { |
| 393 | /* We will get a trace trap after one instruction. |
| 394 | Continue it automatically. Eventually (after shell does an exec) |
| 395 | it will get another trace trap. Then insert breakpoints and continue. */ |
| 396 | |
| 397 | #ifdef START_INFERIOR_TRAPS_EXPECTED |
| 398 | trap_expected = START_INFERIOR_TRAPS_EXPECTED; |
| 399 | #else |
| 400 | trap_expected = 2; |
| 401 | #endif |
| 402 | |
| 403 | running_in_shell = 0; /* Set to 1 at first SIGTRAP, 0 at second. */ |
| 404 | trap_expected_after_continue = 0; |
| 405 | breakpoints_inserted = 0; |
| 406 | mark_breakpoints_out (); |
| 407 | |
| 408 | /* Set up the "saved terminal modes" of the inferior |
| 409 | based on what modes we are starting it with. */ |
| 410 | terminal_init_inferior (); |
| 411 | |
| 412 | /* Install inferior's terminal modes. */ |
| 413 | terminal_inferior (); |
| 414 | |
| 415 | if (remote_debugging) |
| 416 | { |
| 417 | trap_expected = 0; |
| 418 | fetch_inferior_registers(); |
| 419 | set_current_frame (create_new_frame (read_register (FP_REGNUM), |
| 420 | read_pc ())); |
| 421 | stop_frame_address = FRAME_FP (get_current_frame()); |
| 422 | inferior_pid = 3; |
| 423 | if (insert_breakpoints()) |
| 424 | fatal("Can't insert breakpoints"); |
| 425 | breakpoints_inserted = 1; |
| 426 | proceed(-1, -1, 0); |
| 427 | } |
| 428 | else |
| 429 | { |
| 430 | wait_for_inferior (); |
| 431 | normal_stop (); |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | /* Start or restart remote-debugging of a machine over a serial link. */ |
| 436 | |
| 437 | void |
| 438 | restart_remote () |
| 439 | { |
| 440 | clear_proceed_status (); |
| 441 | running_in_shell = 0; |
| 442 | trap_expected = 0; |
| 443 | stop_after_attach = 1; |
| 444 | inferior_pid = 3; |
| 445 | wait_for_inferior (); |
| 446 | normal_stop(); |
| 447 | } |
| 448 | |
| 449 | void |
| 450 | start_remote () |
| 451 | { |
| 452 | breakpoints_inserted = 0; |
| 453 | mark_breakpoints_out (); |
| 454 | restart_remote(); |
| 455 | } |
| 456 | |
| 457 | #ifdef ATTACH_DETACH |
| 458 | |
| 459 | /* Attach to process PID, then initialize for debugging it |
| 460 | and wait for the trace-trap that results from attaching. */ |
| 461 | |
| 462 | void |
| 463 | attach_program (pid) |
| 464 | int pid; |
| 465 | { |
| 466 | attach (pid); |
| 467 | inferior_pid = pid; |
| 468 | |
| 469 | mark_breakpoints_out (); |
| 470 | terminal_init_inferior (); |
| 471 | clear_proceed_status (); |
| 472 | stop_after_attach = 1; |
| 473 | /*proceed (-1, 0, -2);*/ |
| 474 | terminal_inferior (); |
| 475 | wait_for_inferior (); |
| 476 | normal_stop (); |
| 477 | } |
| 478 | #endif /* ATTACH_DETACH */ |
| 479 | \f |
| 480 | /* Wait for control to return from inferior to debugger. |
| 481 | If inferior gets a signal, we may decide to start it up again |
| 482 | instead of returning. That is why there is a loop in this function. |
| 483 | When this function actually returns it means the inferior |
| 484 | should be left stopped and GDB should read more commands. */ |
| 485 | |
| 486 | static void |
| 487 | wait_for_inferior () |
| 488 | { |
| 489 | register int pid; |
| 490 | WAITTYPE w; |
| 491 | CORE_ADDR pc; |
| 492 | int tem; |
| 493 | int another_trap; |
| 494 | int random_signal; |
| 495 | CORE_ADDR stop_sp, prev_sp; |
| 496 | CORE_ADDR prev_func_start, stop_func_start; |
| 497 | char *prev_func_name, *stop_func_name; |
| 498 | CORE_ADDR prologue_pc; |
| 499 | int stop_step_resume_break; |
| 500 | CORE_ADDR step_resume_break_sp; |
| 501 | int newmisc; |
| 502 | int newfun_pc; |
| 503 | struct symtab_and_line sal; |
| 504 | int prev_pc; |
| 505 | extern CORE_ADDR text_end; |
| 506 | int remove_breakpoints_on_following_step = 0; |
| 507 | |
| 508 | prev_pc = read_pc (); |
| 509 | (void) find_pc_partial_function (prev_pc, &prev_func_name, |
| 510 | &prev_func_start); |
| 511 | prev_func_start += FUNCTION_START_OFFSET; |
| 512 | prev_sp = read_register (SP_REGNUM); |
| 513 | |
| 514 | while (1) |
| 515 | { |
| 516 | /* Clean up saved state that will become invalid. */ |
| 517 | pc_changed = 0; |
| 518 | flush_cached_frames (); |
| 519 | |
| 520 | if (remote_debugging) |
| 521 | remote_wait (&w); |
| 522 | else |
| 523 | { |
| 524 | pid = wait (&w); |
| 525 | if (pid != inferior_pid) |
| 526 | continue; |
| 527 | } |
| 528 | |
| 529 | /* See if the process still exists; clean up if it doesn't. */ |
| 530 | if (WIFEXITED (w)) |
| 531 | { |
| 532 | terminal_ours_for_output (); |
| 533 | if (WEXITSTATUS (w)) |
| 534 | printf ("\nProgram exited with code 0%o.\n", WEXITSTATUS (w)); |
| 535 | else |
| 536 | printf ("\nProgram exited normally.\n"); |
| 537 | fflush (stdout); |
| 538 | inferior_died (); |
| 539 | #ifdef NO_SINGLE_STEP |
| 540 | one_stepped = 0; |
| 541 | #endif |
| 542 | stop_print_frame = 0; |
| 543 | break; |
| 544 | } |
| 545 | else if (!WIFSTOPPED (w)) |
| 546 | { |
| 547 | kill_inferior (); |
| 548 | stop_print_frame = 0; |
| 549 | stop_signal = WTERMSIG (w); |
| 550 | terminal_ours_for_output (); |
| 551 | printf ("\nProgram terminated with signal %d, %s\n", |
| 552 | stop_signal, |
| 553 | stop_signal < NSIG |
| 554 | ? sys_siglist[stop_signal] |
| 555 | : "(undocumented)"); |
| 556 | printf ("The inferior process no longer exists.\n"); |
| 557 | fflush (stdout); |
| 558 | #ifdef NO_SINGLE_STEP |
| 559 | one_stepped = 0; |
| 560 | #endif |
| 561 | break; |
| 562 | } |
| 563 | |
| 564 | #ifdef NO_SINGLE_STEP |
| 565 | if (one_stepped) |
| 566 | single_step (0); /* This actually cleans up the ss */ |
| 567 | #endif /* NO_SINGLE_STEP */ |
| 568 | |
| 569 | fetch_inferior_registers (); |
| 570 | stop_pc = read_pc (); |
| 571 | set_current_frame ( create_new_frame (read_register (FP_REGNUM), |
| 572 | read_pc ())); |
| 573 | |
| 574 | stop_frame_address = FRAME_FP (get_current_frame ()); |
| 575 | stop_sp = read_register (SP_REGNUM); |
| 576 | stop_func_start = 0; |
| 577 | stop_func_name = 0; |
| 578 | /* Don't care about return value; stop_func_start and stop_func_name |
| 579 | will both be 0 if it doesn't work. */ |
| 580 | (void) find_pc_partial_function (stop_pc, &stop_func_name, |
| 581 | &stop_func_start); |
| 582 | stop_func_start += FUNCTION_START_OFFSET; |
| 583 | another_trap = 0; |
| 584 | stop_breakpoint = 0; |
| 585 | stop_step = 0; |
| 586 | stop_stack_dummy = 0; |
| 587 | stop_print_frame = 1; |
| 588 | stop_step_resume_break = 0; |
| 589 | random_signal = 0; |
| 590 | stopped_by_random_signal = 0; |
| 591 | breakpoints_failed = 0; |
| 592 | |
| 593 | /* Look at the cause of the stop, and decide what to do. |
| 594 | The alternatives are: |
| 595 | 1) break; to really stop and return to the debugger, |
| 596 | 2) drop through to start up again |
| 597 | (set another_trap to 1 to single step once) |
| 598 | 3) set random_signal to 1, and the decision between 1 and 2 |
| 599 | will be made according to the signal handling tables. */ |
| 600 | |
| 601 | stop_signal = WSTOPSIG (w); |
| 602 | |
| 603 | /* First, distinguish signals caused by the debugger from signals |
| 604 | that have to do with the program's own actions. |
| 605 | Note that breakpoint insns may cause SIGTRAP or SIGILL |
| 606 | or SIGEMT, depending on the operating system version. |
| 607 | Here we detect when a SIGILL or SIGEMT is really a breakpoint |
| 608 | and change it to SIGTRAP. */ |
| 609 | |
| 610 | if (stop_signal == SIGTRAP |
| 611 | || (breakpoints_inserted && |
| 612 | (stop_signal == SIGILL |
| 613 | || stop_signal == SIGEMT)) |
| 614 | || stop_after_attach) |
| 615 | { |
| 616 | if (stop_signal == SIGTRAP && stop_after_trap) |
| 617 | { |
| 618 | stop_print_frame = 0; |
| 619 | break; |
| 620 | } |
| 621 | if (stop_after_attach) |
| 622 | break; |
| 623 | /* Don't even think about breakpoints |
| 624 | if still running the shell that will exec the program |
| 625 | or if just proceeded over a breakpoint. */ |
| 626 | if (stop_signal == SIGTRAP && trap_expected) |
| 627 | stop_breakpoint = 0; |
| 628 | else |
| 629 | { |
| 630 | /* See if there is a breakpoint at the current PC. */ |
| 631 | #if DECR_PC_AFTER_BREAK |
| 632 | /* Notice the case of stepping through a jump |
| 633 | that leads just after a breakpoint. |
| 634 | Don't confuse that with hitting the breakpoint. |
| 635 | What we check for is that 1) stepping is going on |
| 636 | and 2) the pc before the last insn does not match |
| 637 | the address of the breakpoint before the current pc. */ |
| 638 | if (!(prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
| 639 | && step_range_end && !step_resume_break_address)) |
| 640 | #endif /* DECR_PC_AFTER_BREAK not zero */ |
| 641 | { |
| 642 | /* See if we stopped at the special breakpoint for |
| 643 | stepping over a subroutine call. */ |
| 644 | if (stop_pc - DECR_PC_AFTER_BREAK |
| 645 | == step_resume_break_address) |
| 646 | { |
| 647 | stop_step_resume_break = 1; |
| 648 | if (DECR_PC_AFTER_BREAK) |
| 649 | { |
| 650 | stop_pc -= DECR_PC_AFTER_BREAK; |
| 651 | write_register (PC_REGNUM, stop_pc); |
| 652 | pc_changed = 0; |
| 653 | } |
| 654 | } |
| 655 | else |
| 656 | { |
| 657 | stop_breakpoint = |
| 658 | breakpoint_stop_status (stop_pc, stop_frame_address); |
| 659 | /* Following in case break condition called a |
| 660 | function. */ |
| 661 | stop_print_frame = 1; |
| 662 | if (stop_breakpoint && DECR_PC_AFTER_BREAK) |
| 663 | { |
| 664 | stop_pc -= DECR_PC_AFTER_BREAK; |
| 665 | write_register (PC_REGNUM, stop_pc); |
| 666 | #ifdef NPC_REGNUM |
| 667 | write_register (NPC_REGNUM, stop_pc + 4); |
| 668 | #endif |
| 669 | pc_changed = 0; |
| 670 | } |
| 671 | } |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | if (stop_signal == SIGTRAP) |
| 676 | random_signal |
| 677 | = !(stop_breakpoint || trap_expected |
| 678 | || stop_step_resume_break |
| 679 | #ifndef CANNOT_EXECUTE_STACK |
| 680 | || (stop_sp INNER_THAN stop_pc |
| 681 | && stop_pc INNER_THAN stop_frame_address) |
| 682 | #else |
| 683 | || stop_pc == text_end - 2 |
| 684 | #endif |
| 685 | || (step_range_end && !step_resume_break_address)); |
| 686 | else |
| 687 | { |
| 688 | random_signal |
| 689 | = !(stop_breakpoint |
| 690 | || stop_step_resume_break |
| 691 | #ifdef sony_news |
| 692 | || (stop_sp INNER_THAN stop_pc |
| 693 | && stop_pc INNER_THAN stop_frame_address) |
| 694 | #endif |
| 695 | |
| 696 | ); |
| 697 | if (!random_signal) |
| 698 | stop_signal = SIGTRAP; |
| 699 | } |
| 700 | } |
| 701 | else |
| 702 | random_signal = 1; |
| 703 | |
| 704 | /* For the program's own signals, act according to |
| 705 | the signal handling tables. */ |
| 706 | |
| 707 | if (random_signal |
| 708 | && !(running_in_shell && stop_signal == SIGSEGV)) |
| 709 | { |
| 710 | /* Signal not for debugging purposes. */ |
| 711 | int printed = 0; |
| 712 | |
| 713 | stopped_by_random_signal = 1; |
| 714 | |
| 715 | if (stop_signal >= NSIG |
| 716 | || signal_print[stop_signal]) |
| 717 | { |
| 718 | printed = 1; |
| 719 | terminal_ours_for_output (); |
| 720 | printf ("\nProgram received signal %d, %s\n", |
| 721 | stop_signal, |
| 722 | stop_signal < NSIG |
| 723 | ? sys_siglist[stop_signal] |
| 724 | : "(undocumented)"); |
| 725 | fflush (stdout); |
| 726 | } |
| 727 | if (stop_signal >= NSIG |
| 728 | || signal_stop[stop_signal]) |
| 729 | break; |
| 730 | /* If not going to stop, give terminal back |
| 731 | if we took it away. */ |
| 732 | else if (printed) |
| 733 | terminal_inferior (); |
| 734 | } |
| 735 | |
| 736 | /* Handle cases caused by hitting a breakpoint. */ |
| 737 | |
| 738 | if (!random_signal |
| 739 | && (stop_breakpoint || stop_step_resume_break)) |
| 740 | { |
| 741 | /* Does a breakpoint want us to stop? */ |
| 742 | if (stop_breakpoint && stop_breakpoint != -1 |
| 743 | && stop_breakpoint != -0x1000001) |
| 744 | { |
| 745 | /* 0x1000000 is set in stop_breakpoint as returned by |
| 746 | breakpoint_stop_status to indicate a silent |
| 747 | breakpoint. */ |
| 748 | if ((stop_breakpoint > 0 ? stop_breakpoint : |
| 749 | -stop_breakpoint) |
| 750 | & 0x1000000) |
| 751 | { |
| 752 | stop_print_frame = 0; |
| 753 | if (stop_breakpoint > 0) |
| 754 | stop_breakpoint -= 0x1000000; |
| 755 | else |
| 756 | stop_breakpoint += 0x1000000; |
| 757 | } |
| 758 | break; |
| 759 | } |
| 760 | /* But if we have hit the step-resumption breakpoint, |
| 761 | remove it. It has done its job getting us here. |
| 762 | The sp test is to make sure that we don't get hung |
| 763 | up in recursive calls in functions without frame |
| 764 | pointers. If the stack pointer isn't outside of |
| 765 | where the breakpoint was set (within a routine to be |
| 766 | stepped over), we're in the middle of a recursive |
| 767 | call. Not true for reg window machines (sparc) |
| 768 | because the must change frames to call things and |
| 769 | the stack pointer doesn't have to change if it |
| 770 | the bp was set in a routine without a frame (pc can |
| 771 | be stored in some other window). |
| 772 | |
| 773 | The removal of the sp test is to allow calls to |
| 774 | alloca. Nasty things were happening. Oh, well, |
| 775 | gdb can only handle one level deep of lack of |
| 776 | frame pointer. */ |
| 777 | if (stop_step_resume_break |
| 778 | && (step_frame_address == 0 |
| 779 | || (stop_frame_address == step_frame_address))) |
| 780 | { |
| 781 | remove_step_breakpoint (); |
| 782 | step_resume_break_address = 0; |
| 783 | } |
| 784 | /* Otherwise, must remove breakpoints and single-step |
| 785 | to get us past the one we hit. */ |
| 786 | else |
| 787 | { |
| 788 | remove_breakpoints (); |
| 789 | remove_step_breakpoint (); |
| 790 | breakpoints_inserted = 0; |
| 791 | another_trap = 1; |
| 792 | } |
| 793 | |
| 794 | /* We come here if we hit a breakpoint but should not |
| 795 | stop for it. Possibly we also were stepping |
| 796 | and should stop for that. So fall through and |
| 797 | test for stepping. But, if not stepping, |
| 798 | do not stop. */ |
| 799 | } |
| 800 | |
| 801 | /* If this is the breakpoint at the end of a stack dummy, |
| 802 | just stop silently. */ |
| 803 | #ifndef CANNOT_EXECUTE_STACK |
| 804 | if (stop_sp INNER_THAN stop_pc |
| 805 | && stop_pc INNER_THAN stop_frame_address) |
| 806 | #else |
| 807 | if (stop_pc == text_end - 2) |
| 808 | #endif |
| 809 | { |
| 810 | stop_print_frame = 0; |
| 811 | stop_stack_dummy = 1; |
| 812 | #ifdef HP_OS_BUG |
| 813 | trap_expected_after_continue = 1; |
| 814 | #endif |
| 815 | break; |
| 816 | } |
| 817 | |
| 818 | if (step_resume_break_address) |
| 819 | /* Having a step-resume breakpoint overrides anything |
| 820 | else having to do with stepping commands until |
| 821 | that breakpoint is reached. */ |
| 822 | ; |
| 823 | /* If stepping through a line, keep going if still within it. */ |
| 824 | else if (!random_signal |
| 825 | && step_range_end |
| 826 | && stop_pc >= step_range_start |
| 827 | && stop_pc < step_range_end |
| 828 | /* The step range might include the start of the |
| 829 | function, so if we are at the start of the |
| 830 | step range and either the stack or frame pointers |
| 831 | just changed, we've stepped outside */ |
| 832 | && !(stop_pc == step_range_start |
| 833 | && stop_frame_address |
| 834 | && (stop_sp INNER_THAN prev_sp |
| 835 | || stop_frame_address != step_frame_address))) |
| 836 | { |
| 837 | /* Don't step through the return from a function |
| 838 | unless that is the first instruction stepped through. */ |
| 839 | if (ABOUT_TO_RETURN (stop_pc)) |
| 840 | { |
| 841 | stop_step = 1; |
| 842 | break; |
| 843 | } |
| 844 | } |
| 845 | |
| 846 | /* We stepped out of the stepping range. See if that was due |
| 847 | to a subroutine call that we should proceed to the end of. */ |
| 848 | else if (!random_signal && step_range_end) |
| 849 | { |
| 850 | if (stop_func_start) |
| 851 | { |
| 852 | prologue_pc = stop_func_start; |
| 853 | SKIP_PROLOGUE (prologue_pc); |
| 854 | } |
| 855 | |
| 856 | /* Did we just take a signal? */ |
| 857 | if (IN_SIGTRAMP (stop_pc, stop_func_name) |
| 858 | && !IN_SIGTRAMP (prev_pc, prev_func_name)) |
| 859 | { |
| 860 | /* This code is needed at least in the following case: |
| 861 | The user types "next" and then a signal arrives (before |
| 862 | the "next" is done). */ |
| 863 | /* We've just taken a signal; go until we are back to |
| 864 | the point where we took it and one more. */ |
| 865 | step_resume_break_address = prev_pc; |
| 866 | step_resume_break_duplicate = |
| 867 | breakpoint_here_p (step_resume_break_address); |
| 868 | step_resume_break_sp = stop_sp; |
| 869 | if (breakpoints_inserted) |
| 870 | insert_step_breakpoint (); |
| 871 | /* Make sure that the stepping range gets us past |
| 872 | that instruction. */ |
| 873 | if (step_range_end == 1) |
| 874 | step_range_end = (step_range_start = prev_pc) + 1; |
| 875 | remove_breakpoints_on_following_step = 1; |
| 876 | } |
| 877 | |
| 878 | /* ==> See comments at top of file on this algorithm. <==*/ |
| 879 | |
| 880 | else if (stop_pc == stop_func_start |
| 881 | && (stop_func_start != prev_func_start |
| 882 | || prologue_pc != stop_func_start |
| 883 | || stop_sp != prev_sp)) |
| 884 | { |
| 885 | /* It's a subroutine call */ |
| 886 | if (step_over_calls > 0 |
| 887 | || (step_over_calls && find_pc_function (stop_pc) == 0)) |
| 888 | { |
| 889 | /* A subroutine call has happened. */ |
| 890 | /* Set a special breakpoint after the return */ |
| 891 | step_resume_break_address = |
| 892 | SAVED_PC_AFTER_CALL (get_current_frame ()); |
| 893 | step_resume_break_duplicate |
| 894 | = breakpoint_here_p (step_resume_break_address); |
| 895 | step_resume_break_sp = stop_sp; |
| 896 | if (breakpoints_inserted) |
| 897 | insert_step_breakpoint (); |
| 898 | } |
| 899 | /* Subroutine call with source code we should not step over. |
| 900 | Do step to the first line of code in it. */ |
| 901 | else if (step_over_calls) |
| 902 | { |
| 903 | SKIP_PROLOGUE (stop_func_start); |
| 904 | sal = find_pc_line (stop_func_start, 0); |
| 905 | /* Use the step_resume_break to step until |
| 906 | the end of the prologue, even if that involves jumps |
| 907 | (as it seems to on the vax under 4.2). */ |
| 908 | /* If the prologue ends in the middle of a source line, |
| 909 | continue to the end of that source line. |
| 910 | Otherwise, just go to end of prologue. */ |
| 911 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
| 912 | /* no, don't either. It skips any code that's |
| 913 | legitimately on the first line. */ |
| 914 | #else |
| 915 | if (sal.end && sal.pc != stop_func_start) |
| 916 | stop_func_start = sal.end; |
| 917 | #endif |
| 918 | |
| 919 | if (stop_func_start == stop_pc) |
| 920 | { |
| 921 | /* We are already there: stop now. */ |
| 922 | stop_step = 1; |
| 923 | break; |
| 924 | } |
| 925 | else |
| 926 | /* Put the step-breakpoint there and go until there. */ |
| 927 | { |
| 928 | step_resume_break_address = stop_func_start; |
| 929 | step_resume_break_sp = stop_sp; |
| 930 | |
| 931 | step_resume_break_duplicate |
| 932 | = breakpoint_here_p (step_resume_break_address); |
| 933 | if (breakpoints_inserted) |
| 934 | insert_step_breakpoint (); |
| 935 | /* Do not specify what the fp should be when we stop |
| 936 | since on some machines the prologue |
| 937 | is where the new fp value is established. */ |
| 938 | step_frame_address = 0; |
| 939 | /* And make sure stepping stops right away then. */ |
| 940 | step_range_end = step_range_start; |
| 941 | } |
| 942 | } |
| 943 | else |
| 944 | { |
| 945 | /* We get here only if step_over_calls is 0 and we |
| 946 | just stepped into a subroutine. I presume |
| 947 | that step_over_calls is only 0 when we're |
| 948 | supposed to be stepping at the assembly |
| 949 | language level.*/ |
| 950 | stop_step = 1; |
| 951 | break; |
| 952 | } |
| 953 | } |
| 954 | /* No subroutince call; stop now. */ |
| 955 | else |
| 956 | { |
| 957 | stop_step = 1; |
| 958 | break; |
| 959 | } |
| 960 | } |
| 961 | |
| 962 | /* Save the pc before execution, to compare with pc after stop. */ |
| 963 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
| 964 | prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER |
| 965 | BREAK is defined, the |
| 966 | original pc would not have |
| 967 | been at the start of a |
| 968 | function. */ |
| 969 | prev_func_name = stop_func_name; |
| 970 | prev_sp = stop_sp; |
| 971 | |
| 972 | /* If we did not do break;, it means we should keep |
| 973 | running the inferior and not return to debugger. */ |
| 974 | |
| 975 | /* If trap_expected is 2, it means continue once more |
| 976 | and insert breakpoints at the next trap. |
| 977 | If trap_expected is 1 and the signal was SIGSEGV, it means |
| 978 | the shell is doing some memory allocation--just resume it |
| 979 | with SIGSEGV. |
| 980 | Otherwise insert breakpoints now, and possibly single step. */ |
| 981 | |
| 982 | if (trap_expected > 1) |
| 983 | { |
| 984 | trap_expected--; |
| 985 | running_in_shell = 1; |
| 986 | resume (0, 0); |
| 987 | } |
| 988 | else if (running_in_shell && stop_signal == SIGSEGV) |
| 989 | { |
| 990 | resume (0, SIGSEGV); |
| 991 | } |
| 992 | else if (trap_expected && stop_signal != SIGTRAP) |
| 993 | { |
| 994 | /* We took a signal which we are supposed to pass through to |
| 995 | the inferior and we haven't yet gotten our trap. Simply |
| 996 | continue. */ |
| 997 | resume ((step_range_end && !step_resume_break_address) |
| 998 | || trap_expected, |
| 999 | stop_signal); |
| 1000 | } |
| 1001 | else |
| 1002 | { |
| 1003 | /* Here, we are not awaiting another exec to get |
| 1004 | the program we really want to debug. |
| 1005 | Insert breakpoints now, unless we are trying |
| 1006 | to one-proceed past a breakpoint. */ |
| 1007 | running_in_shell = 0; |
| 1008 | /* If we've just finished a special step resume and we don't |
| 1009 | want to hit a breakpoint, pull em out. */ |
| 1010 | if (!step_resume_break_address && |
| 1011 | remove_breakpoints_on_following_step) |
| 1012 | { |
| 1013 | remove_breakpoints_on_following_step = 0; |
| 1014 | remove_breakpoints (); |
| 1015 | breakpoints_inserted = 0; |
| 1016 | } |
| 1017 | else if (!breakpoints_inserted && !another_trap) |
| 1018 | { |
| 1019 | insert_step_breakpoint (); |
| 1020 | breakpoints_failed = insert_breakpoints (); |
| 1021 | if (breakpoints_failed) |
| 1022 | break; |
| 1023 | breakpoints_inserted = 1; |
| 1024 | } |
| 1025 | |
| 1026 | trap_expected = another_trap; |
| 1027 | |
| 1028 | if (stop_signal == SIGTRAP) |
| 1029 | stop_signal = 0; |
| 1030 | |
| 1031 | resume ((step_range_end && !step_resume_break_address) |
| 1032 | || trap_expected, |
| 1033 | stop_signal); |
| 1034 | } |
| 1035 | } |
| 1036 | } |
| 1037 | \f |
| 1038 | /* Here to return control to GDB when the inferior stops for real. |
| 1039 | Print appropriate messages, remove breakpoints, give terminal our modes. |
| 1040 | |
| 1041 | RUNNING_IN_SHELL nonzero means the shell got a signal before |
| 1042 | exec'ing the program we wanted to run. |
| 1043 | STOP_PRINT_FRAME nonzero means print the executing frame |
| 1044 | (pc, function, args, file, line number and line text). |
| 1045 | BREAKPOINTS_FAILED nonzero means stop was due to error |
| 1046 | attempting to insert breakpoints. */ |
| 1047 | |
| 1048 | static void |
| 1049 | normal_stop () |
| 1050 | { |
| 1051 | /* Make sure that the current_frame's pc is correct. This |
| 1052 | is a correction for setting up the frame info before doing |
| 1053 | DECR_PC_AFTER_BREAK */ |
| 1054 | if (inferior_pid) |
| 1055 | (get_current_frame ())->pc = read_pc (); |
| 1056 | |
| 1057 | if (breakpoints_failed) |
| 1058 | { |
| 1059 | terminal_ours_for_output (); |
| 1060 | print_sys_errmsg ("ptrace", breakpoints_failed); |
| 1061 | printf ("Stopped; cannot insert breakpoints.\n\ |
| 1062 | The same program may be running in another process.\n"); |
| 1063 | } |
| 1064 | |
| 1065 | if (inferior_pid) |
| 1066 | remove_step_breakpoint (); |
| 1067 | |
| 1068 | if (inferior_pid && breakpoints_inserted) |
| 1069 | if (remove_breakpoints ()) |
| 1070 | { |
| 1071 | terminal_ours_for_output (); |
| 1072 | printf ("Cannot remove breakpoints because program is no longer writable.\n\ |
| 1073 | It must be running in another process.\n\ |
| 1074 | Further execution is probably impossible.\n"); |
| 1075 | } |
| 1076 | |
| 1077 | breakpoints_inserted = 0; |
| 1078 | |
| 1079 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
| 1080 | Delete any breakpoint that is to be deleted at the next stop. */ |
| 1081 | |
| 1082 | breakpoint_auto_delete (stop_breakpoint); |
| 1083 | |
| 1084 | /* If an auto-display called a function and that got a signal, |
| 1085 | delete that auto-display to avoid an infinite recursion. */ |
| 1086 | |
| 1087 | if (stopped_by_random_signal) |
| 1088 | disable_current_display (); |
| 1089 | |
| 1090 | if (step_multi && stop_step) |
| 1091 | return; |
| 1092 | |
| 1093 | terminal_ours (); |
| 1094 | |
| 1095 | if (running_in_shell) |
| 1096 | { |
| 1097 | if (stop_signal == SIGSEGV) |
| 1098 | { |
| 1099 | char *exec_file = (char *) get_exec_file (1); |
| 1100 | |
| 1101 | if (access (exec_file, X_OK) != 0) |
| 1102 | printf ("The file \"%s\" is not executable.\n", exec_file); |
| 1103 | else |
| 1104 | /* I don't think we should ever get here. |
| 1105 | wait_for_inferior now ignores SIGSEGV's which happen in |
| 1106 | the shell (since the Bourne shell (/bin/sh) has some |
| 1107 | rather, er, uh, *unorthodox* memory management |
| 1108 | involving catching SIGSEGV). */ |
| 1109 | printf ("\ |
| 1110 | You have just encountered a bug in \"sh\". GDB starts your program\n\ |
| 1111 | by running \"sh\" with a command to exec your program.\n\ |
| 1112 | This is so that \"sh\" will process wildcards and I/O redirection.\n\ |
| 1113 | This time, \"sh\" crashed.\n\ |
| 1114 | \n\ |
| 1115 | One known bug in \"sh\" bites when the environment takes up a lot of space.\n\ |
| 1116 | Try \"info env\" to see the environment; then use \"delete env\" to kill\n\ |
| 1117 | some variables whose values are large; then do \"run\" again.\n\ |
| 1118 | \n\ |
| 1119 | If that works, you might want to put those \"delete env\" commands\n\ |
| 1120 | into a \".gdbinit\" file in this directory so they will happen every time.\n"); |
| 1121 | } |
| 1122 | /* Don't confuse user with his program's symbols on sh's data. */ |
| 1123 | stop_print_frame = 0; |
| 1124 | } |
| 1125 | |
| 1126 | if (inferior_pid == 0) |
| 1127 | return; |
| 1128 | |
| 1129 | /* Select innermost stack frame except on return from a stack dummy routine, |
| 1130 | or if the program has exited. */ |
| 1131 | if (!stop_stack_dummy) |
| 1132 | { |
| 1133 | select_frame (get_current_frame (), 0); |
| 1134 | |
| 1135 | if (stop_print_frame) |
| 1136 | { |
| 1137 | if (stop_breakpoint > 0) |
| 1138 | printf ("\nBpt %d, ", stop_breakpoint); |
| 1139 | print_sel_frame (stop_step |
| 1140 | && step_frame_address == stop_frame_address |
| 1141 | && step_start_function == find_pc_function (stop_pc)); |
| 1142 | /* Display the auto-display expressions. */ |
| 1143 | do_displays (); |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | if (stop_stack_dummy) |
| 1148 | { |
| 1149 | /* Pop the empty frame that contains the stack dummy. |
| 1150 | POP_FRAME ends with a setting of the current frame, so we |
| 1151 | can use that next. */ |
| 1152 | #ifndef NEW_CALL_FUNCTION |
| 1153 | POP_FRAME; |
| 1154 | #endif |
| 1155 | select_frame (get_current_frame (), 0); |
| 1156 | } |
| 1157 | } |
| 1158 | \f |
| 1159 | static void |
| 1160 | insert_step_breakpoint () |
| 1161 | { |
| 1162 | if (step_resume_break_address && !step_resume_break_duplicate) |
| 1163 | { |
| 1164 | read_memory (step_resume_break_address, |
| 1165 | step_resume_break_shadow, sizeof break_insn); |
| 1166 | write_memory (step_resume_break_address, |
| 1167 | break_insn, sizeof break_insn); |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | static void |
| 1172 | remove_step_breakpoint () |
| 1173 | { |
| 1174 | if (step_resume_break_address && !step_resume_break_duplicate) |
| 1175 | write_memory (step_resume_break_address, step_resume_break_shadow, |
| 1176 | sizeof break_insn); |
| 1177 | } |
| 1178 | \f |
| 1179 | /* Specify how various signals in the inferior should be handled. */ |
| 1180 | |
| 1181 | static void |
| 1182 | handle_command (args, from_tty) |
| 1183 | char *args; |
| 1184 | int from_tty; |
| 1185 | { |
| 1186 | register char *p = args; |
| 1187 | int signum = 0; |
| 1188 | register int digits, wordlen; |
| 1189 | |
| 1190 | if (!args) |
| 1191 | error_no_arg ("signal to handle"); |
| 1192 | |
| 1193 | while (*p) |
| 1194 | { |
| 1195 | /* Find the end of the next word in the args. */ |
| 1196 | for (wordlen = 0; p[wordlen] && p[wordlen] != ' ' && p[wordlen] != '\t'; |
| 1197 | wordlen++); |
| 1198 | for (digits = 0; p[digits] >= '0' && p[digits] <= '9'; digits++); |
| 1199 | |
| 1200 | /* If it is all digits, it is signal number to operate on. */ |
| 1201 | if (digits == wordlen) |
| 1202 | { |
| 1203 | signum = atoi (p); |
| 1204 | if (signum <= 0 || signum >= NSIG) |
| 1205 | { |
| 1206 | p[wordlen] = '\0'; |
| 1207 | error ("Invalid signal %s given as argument to \"handle\".", p); |
| 1208 | } |
| 1209 | if (signum == SIGTRAP || signum == SIGINT) |
| 1210 | { |
| 1211 | if (!query ("Signal %d is used by the debugger.\nAre you sure you want to change it? ", signum)) |
| 1212 | error ("Not confirmed."); |
| 1213 | } |
| 1214 | } |
| 1215 | else if (signum == 0) |
| 1216 | error ("First argument is not a signal number."); |
| 1217 | |
| 1218 | /* Else, if already got a signal number, look for flag words |
| 1219 | saying what to do for it. */ |
| 1220 | else if (!strncmp (p, "stop", wordlen)) |
| 1221 | { |
| 1222 | signal_stop[signum] = 1; |
| 1223 | signal_print[signum] = 1; |
| 1224 | } |
| 1225 | else if (wordlen >= 2 && !strncmp (p, "print", wordlen)) |
| 1226 | signal_print[signum] = 1; |
| 1227 | else if (wordlen >= 2 && !strncmp (p, "pass", wordlen)) |
| 1228 | signal_program[signum] = 1; |
| 1229 | else if (!strncmp (p, "ignore", wordlen)) |
| 1230 | signal_program[signum] = 0; |
| 1231 | else if (wordlen >= 3 && !strncmp (p, "nostop", wordlen)) |
| 1232 | signal_stop[signum] = 0; |
| 1233 | else if (wordlen >= 4 && !strncmp (p, "noprint", wordlen)) |
| 1234 | { |
| 1235 | signal_print[signum] = 0; |
| 1236 | signal_stop[signum] = 0; |
| 1237 | } |
| 1238 | else if (wordlen >= 4 && !strncmp (p, "nopass", wordlen)) |
| 1239 | signal_program[signum] = 0; |
| 1240 | else if (wordlen >= 3 && !strncmp (p, "noignore", wordlen)) |
| 1241 | signal_program[signum] = 1; |
| 1242 | /* Not a number and not a recognized flag word => complain. */ |
| 1243 | else |
| 1244 | { |
| 1245 | p[wordlen] = 0; |
| 1246 | error ("Unrecognized flag word: \"%s\".", p); |
| 1247 | } |
| 1248 | |
| 1249 | /* Find start of next word. */ |
| 1250 | p += wordlen; |
| 1251 | while (*p == ' ' || *p == '\t') p++; |
| 1252 | } |
| 1253 | |
| 1254 | if (from_tty) |
| 1255 | { |
| 1256 | /* Show the results. */ |
| 1257 | printf ("Number\tStop\tPrint\tPass to program\tDescription\n"); |
| 1258 | printf ("%d\t", signum); |
| 1259 | printf ("%s\t", signal_stop[signum] ? "Yes" : "No"); |
| 1260 | printf ("%s\t", signal_print[signum] ? "Yes" : "No"); |
| 1261 | printf ("%s\t\t", signal_program[signum] ? "Yes" : "No"); |
| 1262 | printf ("%s\n", sys_siglist[signum]); |
| 1263 | } |
| 1264 | } |
| 1265 | |
| 1266 | /* Print current contents of the tables set by the handle command. */ |
| 1267 | |
| 1268 | static void |
| 1269 | signals_info (signum_exp) |
| 1270 | char *signum_exp; |
| 1271 | { |
| 1272 | register int i; |
| 1273 | printf_filtered ("Number\tStop\tPrint\tPass to program\tDescription\n"); |
| 1274 | |
| 1275 | if (signum_exp) |
| 1276 | { |
| 1277 | i = parse_and_eval_address (signum_exp); |
| 1278 | if (i >= NSIG || i < 0) |
| 1279 | error ("Signal number out of bounds."); |
| 1280 | printf_filtered ("%d\t", i); |
| 1281 | printf_filtered ("%s\t", signal_stop[i] ? "Yes" : "No"); |
| 1282 | printf_filtered ("%s\t", signal_print[i] ? "Yes" : "No"); |
| 1283 | printf_filtered ("%s\t\t", signal_program[i] ? "Yes" : "No"); |
| 1284 | printf_filtered ("%s\n", sys_siglist[i]); |
| 1285 | return; |
| 1286 | } |
| 1287 | |
| 1288 | printf_filtered ("\n"); |
| 1289 | for (i = 0; i < NSIG; i++) |
| 1290 | { |
| 1291 | QUIT; |
| 1292 | |
| 1293 | printf_filtered ("%d\t", i); |
| 1294 | printf_filtered ("%s\t", signal_stop[i] ? "Yes" : "No"); |
| 1295 | printf_filtered ("%s\t", signal_print[i] ? "Yes" : "No"); |
| 1296 | printf_filtered ("%s\t\t", signal_program[i] ? "Yes" : "No"); |
| 1297 | printf_filtered ("%s\n", sys_siglist[i]); |
| 1298 | } |
| 1299 | |
| 1300 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); |
| 1301 | } |
| 1302 | \f |
| 1303 | /* Save all of the information associated with the inferior<==>gdb |
| 1304 | connection. INF_STATUS is a pointer to a "struct inferior_status" |
| 1305 | (defined in inferior.h). */ |
| 1306 | |
| 1307 | struct command_line *get_breakpoint_commands (); |
| 1308 | |
| 1309 | void |
| 1310 | save_inferior_status (inf_status, restore_stack_info) |
| 1311 | struct inferior_status *inf_status; |
| 1312 | int restore_stack_info; |
| 1313 | { |
| 1314 | inf_status->pc_changed = pc_changed; |
| 1315 | inf_status->stop_signal = stop_signal; |
| 1316 | inf_status->stop_pc = stop_pc; |
| 1317 | inf_status->stop_frame_address = stop_frame_address; |
| 1318 | inf_status->stop_breakpoint = stop_breakpoint; |
| 1319 | inf_status->stop_step = stop_step; |
| 1320 | inf_status->stop_stack_dummy = stop_stack_dummy; |
| 1321 | inf_status->stopped_by_random_signal = stopped_by_random_signal; |
| 1322 | inf_status->trap_expected = trap_expected; |
| 1323 | inf_status->step_range_start = step_range_start; |
| 1324 | inf_status->step_range_end = step_range_end; |
| 1325 | inf_status->step_frame_address = step_frame_address; |
| 1326 | inf_status->step_over_calls = step_over_calls; |
| 1327 | inf_status->step_resume_break_address = step_resume_break_address; |
| 1328 | inf_status->stop_after_trap = stop_after_trap; |
| 1329 | inf_status->stop_after_attach = stop_after_attach; |
| 1330 | inf_status->breakpoint_commands = get_breakpoint_commands (); |
| 1331 | inf_status->restore_stack_info = restore_stack_info; |
| 1332 | |
| 1333 | read_register_bytes(0, inf_status->register_context, REGISTER_BYTES); |
| 1334 | record_selected_frame (&(inf_status->selected_frame_address), |
| 1335 | &(inf_status->selected_level)); |
| 1336 | return; |
| 1337 | } |
| 1338 | |
| 1339 | void |
| 1340 | restore_inferior_status (inf_status) |
| 1341 | struct inferior_status *inf_status; |
| 1342 | { |
| 1343 | FRAME fid; |
| 1344 | int level = inf_status->selected_level; |
| 1345 | |
| 1346 | pc_changed = inf_status->pc_changed; |
| 1347 | stop_signal = inf_status->stop_signal; |
| 1348 | stop_pc = inf_status->stop_pc; |
| 1349 | stop_frame_address = inf_status->stop_frame_address; |
| 1350 | stop_breakpoint = inf_status->stop_breakpoint; |
| 1351 | stop_step = inf_status->stop_step; |
| 1352 | stop_stack_dummy = inf_status->stop_stack_dummy; |
| 1353 | stopped_by_random_signal = inf_status->stopped_by_random_signal; |
| 1354 | trap_expected = inf_status->trap_expected; |
| 1355 | step_range_start = inf_status->step_range_start; |
| 1356 | step_range_end = inf_status->step_range_end; |
| 1357 | step_frame_address = inf_status->step_frame_address; |
| 1358 | step_over_calls = inf_status->step_over_calls; |
| 1359 | step_resume_break_address = inf_status->step_resume_break_address; |
| 1360 | stop_after_trap = inf_status->stop_after_trap; |
| 1361 | stop_after_attach = inf_status->stop_after_attach; |
| 1362 | set_breakpoint_commands (inf_status->breakpoint_commands); |
| 1363 | |
| 1364 | write_register_bytes(0, inf_status->register_context, REGISTER_BYTES); |
| 1365 | |
| 1366 | /* The inferior can be gone if the user types "print exit(0)" |
| 1367 | (and perhaps other times). */ |
| 1368 | if (have_inferior_p() && inf_status->restore_stack_info) |
| 1369 | { |
| 1370 | flush_cached_frames(); |
| 1371 | set_current_frame(create_new_frame(read_register (FP_REGNUM), |
| 1372 | read_pc())); |
| 1373 | |
| 1374 | fid = find_relative_frame (get_current_frame (), &level); |
| 1375 | |
| 1376 | if (fid == 0 || |
| 1377 | FRAME_FP (fid) != inf_status->selected_frame_address || |
| 1378 | level != 0) |
| 1379 | { |
| 1380 | /* I'm not sure this error message is a good idea. I have |
| 1381 | only seen it occur after "Can't continue previously |
| 1382 | requested operation" (we get called from do_cleanups), in |
| 1383 | which case it just adds insult to injury (one confusing |
| 1384 | error message after another. Besides which, does the |
| 1385 | user really care if we can't restore the previously |
| 1386 | selected frame? */ |
| 1387 | fprintf (stderr, "Unable to restore previously selected frame.\n"); |
| 1388 | select_frame (get_current_frame (), 0); |
| 1389 | return; |
| 1390 | } |
| 1391 | |
| 1392 | select_frame (fid, inf_status->selected_level); |
| 1393 | } |
| 1394 | return; |
| 1395 | } |
| 1396 | |
| 1397 | \f |
| 1398 | void |
| 1399 | _initialize_infrun () |
| 1400 | { |
| 1401 | register int i; |
| 1402 | |
| 1403 | add_info ("signals", signals_info, |
| 1404 | "What debugger does when program gets various signals.\n\ |
| 1405 | Specify a signal number as argument to print info on that signal only."); |
| 1406 | |
| 1407 | add_com ("handle", class_run, handle_command, |
| 1408 | "Specify how to handle a signal.\n\ |
| 1409 | Args are signal number followed by flags.\n\ |
| 1410 | Flags allowed are \"stop\", \"print\", \"pass\",\n\ |
| 1411 | \"nostop\", \"noprint\" or \"nopass\".\n\ |
| 1412 | Print means print a message if this signal happens.\n\ |
| 1413 | Stop means reenter debugger if this signal happens (implies print).\n\ |
| 1414 | Pass means let program see this signal; otherwise program doesn't know.\n\ |
| 1415 | Pass and Stop may be combined."); |
| 1416 | |
| 1417 | for (i = 0; i < NSIG; i++) |
| 1418 | { |
| 1419 | signal_stop[i] = 1; |
| 1420 | signal_print[i] = 1; |
| 1421 | signal_program[i] = 1; |
| 1422 | } |
| 1423 | |
| 1424 | /* Signals caused by debugger's own actions |
| 1425 | should not be given to the program afterwards. */ |
| 1426 | signal_program[SIGTRAP] = 0; |
| 1427 | signal_program[SIGINT] = 0; |
| 1428 | |
| 1429 | /* Signals that are not errors should not normally enter the debugger. */ |
| 1430 | #ifdef SIGALRM |
| 1431 | signal_stop[SIGALRM] = 0; |
| 1432 | signal_print[SIGALRM] = 0; |
| 1433 | #endif /* SIGALRM */ |
| 1434 | #ifdef SIGVTALRM |
| 1435 | signal_stop[SIGVTALRM] = 0; |
| 1436 | signal_print[SIGVTALRM] = 0; |
| 1437 | #endif /* SIGVTALRM */ |
| 1438 | #ifdef SIGPROF |
| 1439 | signal_stop[SIGPROF] = 0; |
| 1440 | signal_print[SIGPROF] = 0; |
| 1441 | #endif /* SIGPROF */ |
| 1442 | #ifdef SIGCHLD |
| 1443 | signal_stop[SIGCHLD] = 0; |
| 1444 | signal_print[SIGCHLD] = 0; |
| 1445 | #endif /* SIGCHLD */ |
| 1446 | #ifdef SIGCLD |
| 1447 | signal_stop[SIGCLD] = 0; |
| 1448 | signal_print[SIGCLD] = 0; |
| 1449 | #endif /* SIGCLD */ |
| 1450 | #ifdef SIGIO |
| 1451 | signal_stop[SIGIO] = 0; |
| 1452 | signal_print[SIGIO] = 0; |
| 1453 | #endif /* SIGIO */ |
| 1454 | #ifdef SIGURG |
| 1455 | signal_stop[SIGURG] = 0; |
| 1456 | signal_print[SIGURG] = 0; |
| 1457 | #endif /* SIGURG */ |
| 1458 | } |
| 1459 | |