| 1 | /* Memory-access and commands for inferior process, for GDB. |
| 2 | Copyright (C) 1986, 1987, 1988, 1989 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | GDB 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 1, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GDB 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 GDB; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include <stdio.h> |
| 21 | #include <signal.h> |
| 22 | #include <sys/param.h> |
| 23 | #include <string.h> |
| 24 | #include "defs.h" |
| 25 | #include "param.h" |
| 26 | #include "symtab.h" |
| 27 | #include "frame.h" |
| 28 | #include "inferior.h" |
| 29 | #include "environ.h" |
| 30 | #include "value.h" |
| 31 | #include "gdbcmd.h" |
| 32 | #include "gdbcore.h" |
| 33 | #include "target.h" |
| 34 | |
| 35 | extern char *sys_siglist[]; |
| 36 | |
| 37 | extern void until_break_command (); /* breakpoint.c */ |
| 38 | |
| 39 | #define ERROR_NO_INFERIOR \ |
| 40 | if (!target_has_execution) error ("The program is not being run."); |
| 41 | |
| 42 | /* String containing arguments to give to the program, separated by spaces. |
| 43 | Empty string (pointer to '\0') means no args. */ |
| 44 | |
| 45 | static char *inferior_args; |
| 46 | |
| 47 | /* File name for default use for standard in/out in the inferior. */ |
| 48 | |
| 49 | char *inferior_io_terminal; |
| 50 | |
| 51 | /* Pid of our debugged inferior, or 0 if no inferior now. |
| 52 | Since various parts of infrun.c test this to see whether there is a program |
| 53 | being debugged it should be nonzero (currently 3 is used) for remote |
| 54 | debugging. */ |
| 55 | |
| 56 | int inferior_pid; |
| 57 | |
| 58 | /* Last signal that the inferior received (why it stopped). */ |
| 59 | |
| 60 | int stop_signal; |
| 61 | |
| 62 | /* Address at which inferior stopped. */ |
| 63 | |
| 64 | CORE_ADDR stop_pc; |
| 65 | |
| 66 | /* Stack frame when program stopped. */ |
| 67 | |
| 68 | FRAME_ADDR stop_frame_address; |
| 69 | |
| 70 | /* Chain containing status of breakpoint(s) that we have stopped at. */ |
| 71 | |
| 72 | bpstat stop_bpstat; |
| 73 | |
| 74 | /* Flag indicating that a command has proceeded the inferior past the |
| 75 | current breakpoint. */ |
| 76 | |
| 77 | int breakpoint_proceeded; |
| 78 | |
| 79 | /* Nonzero if stopped due to a step command. */ |
| 80 | |
| 81 | int stop_step; |
| 82 | |
| 83 | /* Nonzero if stopped due to completion of a stack dummy routine. */ |
| 84 | |
| 85 | int stop_stack_dummy; |
| 86 | |
| 87 | /* Nonzero if stopped due to a random (unexpected) signal in inferior |
| 88 | process. */ |
| 89 | |
| 90 | int stopped_by_random_signal; |
| 91 | |
| 92 | /* Range to single step within. |
| 93 | If this is nonzero, respond to a single-step signal |
| 94 | by continuing to step if the pc is in this range. */ |
| 95 | |
| 96 | CORE_ADDR step_range_start; /* Inclusive */ |
| 97 | CORE_ADDR step_range_end; /* Exclusive */ |
| 98 | |
| 99 | /* Stack frame address as of when stepping command was issued. |
| 100 | This is how we know when we step into a subroutine call, |
| 101 | and how to set the frame for the breakpoint used to step out. */ |
| 102 | |
| 103 | FRAME_ADDR step_frame_address; |
| 104 | |
| 105 | /* 1 means step over all subroutine calls. |
| 106 | -1 means step over calls to undebuggable functions. */ |
| 107 | |
| 108 | int step_over_calls; |
| 109 | |
| 110 | /* If stepping, nonzero means step count is > 1 |
| 111 | so don't print frame next time inferior stops |
| 112 | if it stops due to stepping. */ |
| 113 | |
| 114 | int step_multi; |
| 115 | |
| 116 | /* Environment to use for running inferior, |
| 117 | in format described in environ.h. */ |
| 118 | |
| 119 | struct environ *inferior_environ; |
| 120 | |
| 121 | CORE_ADDR read_pc (); |
| 122 | void breakpoint_clear_ignore_counts (); |
| 123 | |
| 124 | \f |
| 125 | /* ARGSUSED */ |
| 126 | void |
| 127 | tty_command (file, from_tty) |
| 128 | char *file; |
| 129 | int from_tty; |
| 130 | { |
| 131 | if (file == 0) |
| 132 | error_no_arg ("terminal name for running target process"); |
| 133 | |
| 134 | inferior_io_terminal = savestring (file, strlen (file)); |
| 135 | } |
| 136 | |
| 137 | static void |
| 138 | run_command (args, from_tty) |
| 139 | char *args; |
| 140 | int from_tty; |
| 141 | { |
| 142 | char *exec_file; |
| 143 | |
| 144 | dont_repeat (); |
| 145 | |
| 146 | if (inferior_pid) |
| 147 | { |
| 148 | if ( |
| 149 | !query ("The program being debugged has been started already.\n\ |
| 150 | Start it from the beginning? ")) |
| 151 | error ("Program not restarted."); |
| 152 | target_kill ((char *)0, 0); |
| 153 | } |
| 154 | |
| 155 | exec_file = (char *) get_exec_file (0); |
| 156 | |
| 157 | /* The exec file is re-read every time we do an inferior_died, so |
| 158 | we just have to worry about the symbol file. */ |
| 159 | reread_symbols (); |
| 160 | |
| 161 | if (args) |
| 162 | { |
| 163 | char *cmd; |
| 164 | cmd = concat ("set args ", args, ""); |
| 165 | make_cleanup (free, cmd); |
| 166 | execute_command (cmd, from_tty); |
| 167 | } |
| 168 | |
| 169 | if (from_tty) |
| 170 | { |
| 171 | printf ("Starting program: %s %s\n", |
| 172 | exec_file? exec_file: "", inferior_args); |
| 173 | fflush (stdout); |
| 174 | } |
| 175 | |
| 176 | target_create_inferior (exec_file, inferior_args, |
| 177 | environ_vector (inferior_environ)); |
| 178 | } |
| 179 | \f |
| 180 | void |
| 181 | continue_command (proc_count_exp, from_tty) |
| 182 | char *proc_count_exp; |
| 183 | int from_tty; |
| 184 | { |
| 185 | ERROR_NO_INFERIOR; |
| 186 | |
| 187 | /* If have argument, set proceed count of breakpoint we stopped at. */ |
| 188 | |
| 189 | if (proc_count_exp != NULL) |
| 190 | { |
| 191 | bpstat bs = stop_bpstat; |
| 192 | int num = bpstat_num (&bs); |
| 193 | if (num == 0 && from_tty) |
| 194 | { |
| 195 | printf_filtered |
| 196 | ("Not stopped at any breakpoint; argument ignored.\n"); |
| 197 | } |
| 198 | while (num != 0) |
| 199 | { |
| 200 | set_ignore_count (num, |
| 201 | parse_and_eval_address (proc_count_exp) - 1, |
| 202 | from_tty); |
| 203 | /* set_ignore_count prints a message ending with a period. |
| 204 | So print two spaces before "Continuing.". */ |
| 205 | if (from_tty) |
| 206 | printf (" "); |
| 207 | num = bpstat_num (&bs); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | if (from_tty) |
| 212 | printf ("Continuing.\n"); |
| 213 | |
| 214 | clear_proceed_status (); |
| 215 | |
| 216 | proceed ((CORE_ADDR) -1, -1, 0); |
| 217 | } |
| 218 | \f |
| 219 | /* Step until outside of current statement. */ |
| 220 | static void step_1 (); |
| 221 | |
| 222 | /* ARGSUSED */ |
| 223 | static void |
| 224 | step_command (count_string, from_tty) |
| 225 | char * count_string; |
| 226 | int from_tty; |
| 227 | { |
| 228 | step_1 (0, 0, count_string); |
| 229 | } |
| 230 | |
| 231 | /* Likewise, but skip over subroutine calls as if single instructions. */ |
| 232 | |
| 233 | /* ARGSUSED */ |
| 234 | static void |
| 235 | next_command (count_string, from_tty) |
| 236 | char * count_string; |
| 237 | int from_tty; |
| 238 | { |
| 239 | step_1 (1, 0, count_string); |
| 240 | } |
| 241 | |
| 242 | /* Likewise, but step only one instruction. */ |
| 243 | |
| 244 | /* ARGSUSED */ |
| 245 | static void |
| 246 | stepi_command (count_string, from_tty) |
| 247 | char * count_string; |
| 248 | int from_tty; |
| 249 | { |
| 250 | step_1 (0, 1, count_string); |
| 251 | } |
| 252 | |
| 253 | /* ARGSUSED */ |
| 254 | static void |
| 255 | nexti_command (count_string, from_tty) |
| 256 | char * count_string; |
| 257 | int from_tty; |
| 258 | { |
| 259 | step_1 (1, 1, count_string); |
| 260 | } |
| 261 | |
| 262 | static void |
| 263 | step_1 (skip_subroutines, single_inst, count_string) |
| 264 | int skip_subroutines; |
| 265 | int single_inst; |
| 266 | char *count_string; |
| 267 | { |
| 268 | register int count = 1; |
| 269 | FRAME fr; |
| 270 | |
| 271 | ERROR_NO_INFERIOR; |
| 272 | count = count_string ? parse_and_eval_address (count_string) : 1; |
| 273 | |
| 274 | for (; count > 0; count--) |
| 275 | { |
| 276 | clear_proceed_status (); |
| 277 | |
| 278 | |
| 279 | fr = get_current_frame (); |
| 280 | if (!fr) /* Avoid coredump here. Why tho? */ |
| 281 | error ("No current frame"); |
| 282 | step_frame_address = FRAME_FP (fr); |
| 283 | |
| 284 | if (! single_inst) |
| 285 | { |
| 286 | find_pc_line_pc_range (stop_pc, &step_range_start, &step_range_end); |
| 287 | if (step_range_end == 0) |
| 288 | { |
| 289 | int misc; |
| 290 | |
| 291 | misc = find_pc_misc_function (stop_pc); |
| 292 | target_terminal_ours (); |
| 293 | printf ("Current function has no line number information.\n"); |
| 294 | fflush (stdout); |
| 295 | |
| 296 | /* No info or after _etext ("Can't happen") */ |
| 297 | if (misc == -1 || misc == misc_function_count - 1) |
| 298 | error ("No data available on pc function."); |
| 299 | |
| 300 | printf ("Single stepping until function exit.\n"); |
| 301 | fflush (stdout); |
| 302 | |
| 303 | step_range_start = misc_function_vector[misc].address; |
| 304 | step_range_end = misc_function_vector[misc + 1].address; |
| 305 | } |
| 306 | } |
| 307 | else |
| 308 | { |
| 309 | /* Say we are stepping, but stop after one insn whatever it does. |
| 310 | Don't step through subroutine calls even to undebuggable |
| 311 | functions. */ |
| 312 | step_range_start = step_range_end = 1; |
| 313 | if (!skip_subroutines) |
| 314 | step_over_calls = 0; |
| 315 | } |
| 316 | |
| 317 | if (skip_subroutines) |
| 318 | step_over_calls = 1; |
| 319 | |
| 320 | step_multi = (count > 1); |
| 321 | proceed ((CORE_ADDR) -1, -1, 1); |
| 322 | if (! stop_step) |
| 323 | break; |
| 324 | #if defined (SHIFT_INST_REGS) |
| 325 | write_register (NNPC_REGNUM, read_register (NPC_REGNUM)); |
| 326 | write_register (NPC_REGNUM, read_register (PC_REGNUM)); |
| 327 | #endif |
| 328 | } |
| 329 | } |
| 330 | \f |
| 331 | /* Continue program at specified address. */ |
| 332 | |
| 333 | static void |
| 334 | jump_command (arg, from_tty) |
| 335 | char *arg; |
| 336 | int from_tty; |
| 337 | { |
| 338 | register CORE_ADDR addr; |
| 339 | struct symtabs_and_lines sals; |
| 340 | struct symtab_and_line sal; |
| 341 | |
| 342 | ERROR_NO_INFERIOR; |
| 343 | |
| 344 | if (!arg) |
| 345 | error_no_arg ("starting address"); |
| 346 | |
| 347 | sals = decode_line_spec_1 (arg, 1); |
| 348 | if (sals.nelts != 1) |
| 349 | { |
| 350 | error ("Unreasonable jump request"); |
| 351 | } |
| 352 | |
| 353 | sal = sals.sals[0]; |
| 354 | free (sals.sals); |
| 355 | |
| 356 | if (sal.symtab == 0 && sal.pc == 0) |
| 357 | error ("No source file has been specified."); |
| 358 | |
| 359 | if (sal.pc == 0) |
| 360 | sal.pc = find_line_pc (sal.symtab, sal.line); |
| 361 | |
| 362 | { |
| 363 | struct symbol *fn = get_frame_function (get_current_frame ()); |
| 364 | struct symbol *sfn = find_pc_function (sal.pc); |
| 365 | if (fn != 0 && sfn != fn |
| 366 | && ! query ("Line %d is not in `%s'. Jump anyway? ", |
| 367 | sal.line, SYMBOL_NAME (fn))) |
| 368 | error ("Not confirmed."); |
| 369 | } |
| 370 | |
| 371 | if (sal.pc == 0) |
| 372 | error ("No line %d in file \"%s\".", sal.line, sal.symtab->filename); |
| 373 | |
| 374 | addr = ADDR_BITS_SET (sal.pc); |
| 375 | |
| 376 | if (from_tty) |
| 377 | printf ("Continuing at 0x%x.\n", addr); |
| 378 | |
| 379 | clear_proceed_status (); |
| 380 | proceed (addr, 0, 0); |
| 381 | } |
| 382 | |
| 383 | /* Continue program giving it specified signal. */ |
| 384 | |
| 385 | static void |
| 386 | signal_command (signum_exp, from_tty) |
| 387 | char *signum_exp; |
| 388 | int from_tty; |
| 389 | { |
| 390 | register int signum; |
| 391 | |
| 392 | dont_repeat (); /* Too dangerous. */ |
| 393 | ERROR_NO_INFERIOR; |
| 394 | |
| 395 | if (!signum_exp) |
| 396 | error_no_arg ("signal number"); |
| 397 | |
| 398 | signum = parse_and_eval_address (signum_exp); |
| 399 | |
| 400 | if (from_tty) |
| 401 | printf ("Continuing with signal %d.\n", signum); |
| 402 | |
| 403 | clear_proceed_status (); |
| 404 | proceed (stop_pc, signum, 0); |
| 405 | } |
| 406 | |
| 407 | /* Execute a "stack dummy", a piece of code stored in the stack |
| 408 | by the debugger to be executed in the inferior. |
| 409 | |
| 410 | To call: first, do PUSH_DUMMY_FRAME. |
| 411 | Then push the contents of the dummy. It should end with a breakpoint insn. |
| 412 | Then call here, passing address at which to start the dummy. |
| 413 | |
| 414 | The contents of all registers are saved before the dummy frame is popped |
| 415 | and copied into the buffer BUFFER. |
| 416 | |
| 417 | The dummy's frame is automatically popped whenever that break is hit. |
| 418 | If that is the first time the program stops, run_stack_dummy |
| 419 | returns to its caller with that frame already gone. |
| 420 | Otherwise, the caller never gets returned to. */ |
| 421 | |
| 422 | /* 4 => return instead of letting the stack dummy run. */ |
| 423 | |
| 424 | static int stack_dummy_testing = 0; |
| 425 | |
| 426 | void |
| 427 | run_stack_dummy (addr, buffer) |
| 428 | CORE_ADDR addr; |
| 429 | char buffer[REGISTER_BYTES]; |
| 430 | { |
| 431 | /* Now proceed, having reached the desired place. */ |
| 432 | clear_proceed_status (); |
| 433 | if (stack_dummy_testing & 4) |
| 434 | { |
| 435 | POP_FRAME; |
| 436 | return; |
| 437 | } |
| 438 | proceed_to_finish = 1; /* We want stop_registers, please... */ |
| 439 | proceed (addr, 0, 0); |
| 440 | |
| 441 | if (!stop_stack_dummy) |
| 442 | /* This used to say |
| 443 | "Cannot continue previously requested operation". */ |
| 444 | error ("\ |
| 445 | The program being debugged stopped while in a function called from GDB.\n\ |
| 446 | The expression which contained the function call has been discarded."); |
| 447 | |
| 448 | /* On return, the stack dummy has been popped already. */ |
| 449 | |
| 450 | bcopy (stop_registers, buffer, sizeof stop_registers); |
| 451 | } |
| 452 | \f |
| 453 | /* Proceed until we reach a different source line with pc greater than |
| 454 | our current one or exit the function. We skip calls in both cases. |
| 455 | |
| 456 | Note that eventually this command should probably be changed so |
| 457 | that only source lines are printed out when we hit the breakpoint |
| 458 | we set. I'm going to postpone this until after a hopeful rewrite |
| 459 | of wait_for_inferior and the proceed status code. -- randy */ |
| 460 | |
| 461 | /* ARGSUSED */ |
| 462 | void |
| 463 | until_next_command (from_tty) |
| 464 | int from_tty; |
| 465 | { |
| 466 | FRAME frame; |
| 467 | CORE_ADDR pc; |
| 468 | struct symbol *func; |
| 469 | struct symtab_and_line sal; |
| 470 | |
| 471 | clear_proceed_status (); |
| 472 | |
| 473 | frame = get_current_frame (); |
| 474 | |
| 475 | /* Step until either exited from this function or greater |
| 476 | than the current line (if in symbolic section) or pc (if |
| 477 | not). */ |
| 478 | |
| 479 | pc = read_pc (); |
| 480 | func = find_pc_function (pc); |
| 481 | |
| 482 | if (!func) |
| 483 | { |
| 484 | int misc_func = find_pc_misc_function (pc); |
| 485 | |
| 486 | if (misc_func != -1) |
| 487 | error ("Execution is not within a known function."); |
| 488 | |
| 489 | step_range_start = misc_function_vector[misc_func].address; |
| 490 | step_range_end = pc; |
| 491 | } |
| 492 | else |
| 493 | { |
| 494 | sal = find_pc_line (pc, 0); |
| 495 | |
| 496 | step_range_start = BLOCK_START (SYMBOL_BLOCK_VALUE (func)); |
| 497 | step_range_end = sal.end; |
| 498 | } |
| 499 | |
| 500 | step_over_calls = 1; |
| 501 | step_frame_address = FRAME_FP (frame); |
| 502 | |
| 503 | step_multi = 0; /* Only one call to proceed */ |
| 504 | |
| 505 | proceed ((CORE_ADDR) -1, -1, 1); |
| 506 | } |
| 507 | |
| 508 | void |
| 509 | until_command (arg, from_tty) |
| 510 | char *arg; |
| 511 | int from_tty; |
| 512 | { |
| 513 | if (!target_has_execution) |
| 514 | error ("The program is not running."); |
| 515 | if (arg) |
| 516 | until_break_command (arg, from_tty); |
| 517 | else |
| 518 | until_next_command (from_tty); |
| 519 | } |
| 520 | \f |
| 521 | /* "finish": Set a temporary breakpoint at the place |
| 522 | the selected frame will return to, then continue. */ |
| 523 | |
| 524 | static void |
| 525 | finish_command (arg, from_tty) |
| 526 | char *arg; |
| 527 | int from_tty; |
| 528 | { |
| 529 | struct symtab_and_line sal; |
| 530 | register FRAME frame; |
| 531 | struct frame_info *fi; |
| 532 | register struct symbol *function; |
| 533 | |
| 534 | if (arg) |
| 535 | error ("The \"finish\" command does not take any arguments."); |
| 536 | if (!target_has_execution) |
| 537 | error ("The program is not running."); |
| 538 | if (selected_frame == NULL) |
| 539 | error ("No selected frame."); |
| 540 | |
| 541 | frame = get_prev_frame (selected_frame); |
| 542 | if (frame == 0) |
| 543 | error ("\"finish\" not meaningful in the outermost frame."); |
| 544 | |
| 545 | clear_proceed_status (); |
| 546 | |
| 547 | fi = get_frame_info (frame); |
| 548 | sal = find_pc_line (fi->pc, 0); |
| 549 | sal.pc = fi->pc; |
| 550 | set_momentary_breakpoint (sal, frame); |
| 551 | |
| 552 | /* Find the function we will return from. */ |
| 553 | |
| 554 | fi = get_frame_info (selected_frame); |
| 555 | function = find_pc_function (fi->pc); |
| 556 | |
| 557 | if (from_tty) |
| 558 | { |
| 559 | printf ("Run till exit from "); |
| 560 | print_selected_frame (); |
| 561 | } |
| 562 | |
| 563 | proceed_to_finish = 1; /* We want stop_registers, please... */ |
| 564 | proceed ((CORE_ADDR) -1, -1, 0); |
| 565 | |
| 566 | if (bpstat_momentary_breakpoint (stop_bpstat) && function != 0) |
| 567 | { |
| 568 | struct type *value_type; |
| 569 | register value val; |
| 570 | CORE_ADDR funcaddr; |
| 571 | |
| 572 | value_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (function)); |
| 573 | if (!value_type) |
| 574 | fatal ("internal: finish_command: function has no target type"); |
| 575 | |
| 576 | if (TYPE_CODE (value_type) == TYPE_CODE_VOID) |
| 577 | return; |
| 578 | |
| 579 | funcaddr = BLOCK_START (SYMBOL_BLOCK_VALUE (function)); |
| 580 | |
| 581 | val = value_being_returned (value_type, stop_registers, |
| 582 | using_struct_return (value_of_variable (function), |
| 583 | funcaddr, |
| 584 | value_type, |
| 585 | BLOCK_GCC_COMPILED (SYMBOL_BLOCK_VALUE (function)))); |
| 586 | |
| 587 | printf ("Value returned is $%d = ", record_latest_value (val)); |
| 588 | value_print (val, stdout, 0, Val_no_prettyprint); |
| 589 | putchar ('\n'); |
| 590 | } |
| 591 | } |
| 592 | \f |
| 593 | /* ARGSUSED */ |
| 594 | static void |
| 595 | program_info (args, from_tty) |
| 596 | char *args; |
| 597 | int from_tty; |
| 598 | { |
| 599 | bpstat bs = stop_bpstat; |
| 600 | int num = bpstat_num (&bs); |
| 601 | |
| 602 | if (!target_has_execution) |
| 603 | { |
| 604 | printf ("The program being debugged is not being run.\n"); |
| 605 | return; |
| 606 | } |
| 607 | |
| 608 | target_files_info (); |
| 609 | printf ("Program stopped at 0x%x.\n", stop_pc); |
| 610 | if (stop_step) |
| 611 | printf ("It stopped after being stepped.\n"); |
| 612 | else if (num != 0) |
| 613 | { |
| 614 | /* There may be several breakpoints in the same place, so this |
| 615 | isn't as strange as it seems. */ |
| 616 | while (num != 0) |
| 617 | { |
| 618 | if (num < 0) |
| 619 | printf ("It stopped at a breakpoint that has since been deleted.\n"); |
| 620 | else |
| 621 | printf ("It stopped at breakpoint %d.\n", num); |
| 622 | num = bpstat_num (&bs); |
| 623 | } |
| 624 | } |
| 625 | else if (stop_signal) { |
| 626 | #ifdef PRINT_RANDOM_SIGNAL |
| 627 | PRINT_RANDOM_SIGNAL (stop_signal); |
| 628 | #else |
| 629 | printf ("It stopped with signal %d (%s).\n", |
| 630 | stop_signal, |
| 631 | (stop_signal > NSIG)? "unknown": sys_siglist[stop_signal]); |
| 632 | #endif |
| 633 | } |
| 634 | |
| 635 | if (!from_tty) |
| 636 | printf ("Type \"info stack\" or \"info registers\" for more information.\n"); |
| 637 | } |
| 638 | \f |
| 639 | static void |
| 640 | environment_info (var) |
| 641 | char *var; |
| 642 | { |
| 643 | if (var) |
| 644 | { |
| 645 | register char *val = get_in_environ (inferior_environ, var); |
| 646 | if (val) |
| 647 | printf ("%s = %s\n", var, val); |
| 648 | else |
| 649 | printf ("Environment variable \"%s\" not defined.\n", var); |
| 650 | } |
| 651 | else |
| 652 | { |
| 653 | register char **vector = environ_vector (inferior_environ); |
| 654 | while (*vector) |
| 655 | printf ("%s\n", *vector++); |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | static void |
| 660 | set_environment_command (arg) |
| 661 | char *arg; |
| 662 | { |
| 663 | register char *p, *val, *var; |
| 664 | int nullset = 0; |
| 665 | |
| 666 | if (arg == 0) |
| 667 | error_no_arg ("environment variable and value"); |
| 668 | |
| 669 | /* Find seperation between variable name and value */ |
| 670 | p = (char *) strchr (arg, '='); |
| 671 | val = (char *) strchr (arg, ' '); |
| 672 | |
| 673 | if (p != 0 && val != 0) |
| 674 | { |
| 675 | /* We have both a space and an equals. If the space is before the |
| 676 | equals and the only thing between the two is more space, use |
| 677 | the equals */ |
| 678 | if (p > val) |
| 679 | while (*val == ' ') |
| 680 | val++; |
| 681 | |
| 682 | /* Take the smaller of the two. If there was space before the |
| 683 | "=", they will be the same right now. */ |
| 684 | p = arg + min (p - arg, val - arg); |
| 685 | } |
| 686 | else if (val != 0 && p == 0) |
| 687 | p = val; |
| 688 | |
| 689 | if (p == arg) |
| 690 | error_no_arg ("environment variable to set"); |
| 691 | |
| 692 | if (p == 0 || p[1] == 0) |
| 693 | { |
| 694 | nullset = 1; |
| 695 | if (p == 0) |
| 696 | p = arg + strlen (arg); /* So that savestring below will work */ |
| 697 | } |
| 698 | else |
| 699 | { |
| 700 | /* Not setting variable value to null */ |
| 701 | val = p + 1; |
| 702 | while (*val == ' ' || *val == '\t') |
| 703 | val++; |
| 704 | } |
| 705 | |
| 706 | while (p != arg && (p[-1] == ' ' || p[-1] == '\t')) p--; |
| 707 | |
| 708 | var = savestring (arg, p - arg); |
| 709 | if (nullset) |
| 710 | { |
| 711 | printf ("Setting environment variable \"%s\" to null value.\n", var); |
| 712 | set_in_environ (inferior_environ, var, ""); |
| 713 | } |
| 714 | else |
| 715 | set_in_environ (inferior_environ, var, val); |
| 716 | free (var); |
| 717 | } |
| 718 | |
| 719 | static void |
| 720 | unset_environment_command (var, from_tty) |
| 721 | char *var; |
| 722 | int from_tty; |
| 723 | { |
| 724 | if (var == 0) |
| 725 | { |
| 726 | /* If there is no argument, delete all environment variables. |
| 727 | Ask for confirmation if reading from the terminal. */ |
| 728 | if (!from_tty || query ("Delete all environment variables? ")) |
| 729 | { |
| 730 | free_environ (inferior_environ); |
| 731 | inferior_environ = make_environ (); |
| 732 | } |
| 733 | } |
| 734 | else |
| 735 | unset_in_environ (inferior_environ, var); |
| 736 | } |
| 737 | |
| 738 | /* Handle the execution path (PATH variable) */ |
| 739 | |
| 740 | const static char path_var_name[] = "PATH"; |
| 741 | |
| 742 | /* ARGSUSED */ |
| 743 | void |
| 744 | path_info (args, from_tty) |
| 745 | char *args; |
| 746 | int from_tty; |
| 747 | { |
| 748 | printf ("Executable and object file path: %s\n", |
| 749 | get_in_environ (inferior_environ, path_var_name)); |
| 750 | } |
| 751 | |
| 752 | /* Add zero or more directories to the front of the execution path. */ |
| 753 | |
| 754 | void |
| 755 | path_command (dirname, from_tty) |
| 756 | char *dirname; |
| 757 | int from_tty; |
| 758 | { |
| 759 | char *exec_path; |
| 760 | |
| 761 | dont_repeat (); |
| 762 | exec_path = strsave (get_in_environ (inferior_environ, path_var_name)); |
| 763 | mod_path (dirname, &exec_path); |
| 764 | set_in_environ (inferior_environ, path_var_name, exec_path); |
| 765 | free (exec_path); |
| 766 | if (from_tty) |
| 767 | path_info ((char *)NULL, from_tty); |
| 768 | } |
| 769 | \f |
| 770 | CORE_ADDR |
| 771 | read_pc () |
| 772 | { |
| 773 | return ADDR_BITS_REMOVE ((CORE_ADDR) read_register (PC_REGNUM)); |
| 774 | } |
| 775 | |
| 776 | void |
| 777 | write_pc (val) |
| 778 | CORE_ADDR val; |
| 779 | { |
| 780 | write_register (PC_REGNUM, (long) val); |
| 781 | #ifdef NPC_REGNUM |
| 782 | write_register (NPC_REGNUM, (long) val+4); |
| 783 | #endif |
| 784 | pc_changed = 0; |
| 785 | } |
| 786 | |
| 787 | char *reg_names[] = REGISTER_NAMES; |
| 788 | |
| 789 | /* Print out the machine register regnum. If regnum is -1, |
| 790 | print all registers. |
| 791 | For most machines, having all_registers_info() print the |
| 792 | register(s) one per line is good enough. If a different format |
| 793 | is required, (eg, for SPARC or Pyramid 90x, which both have |
| 794 | lots of regs), or there is an existing convention for showing |
| 795 | all the registers, define the macro DO_REGISTERS_INFO(regnum) |
| 796 | to provide that format. */ |
| 797 | #if !defined (DO_REGISTERS_INFO) |
| 798 | #define DO_REGISTERS_INFO(regnum) do_registers_info(regnum) |
| 799 | static void do_registers_info (regnum) |
| 800 | int regnum; |
| 801 | { |
| 802 | register int i; |
| 803 | |
| 804 | if (regnum == -1) |
| 805 | printf_filtered ( |
| 806 | "Register Contents (relative to selected stack frame)\n\n"); |
| 807 | |
| 808 | for (i = 0; i < NUM_REGS; i++) |
| 809 | { |
| 810 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; |
| 811 | char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; |
| 812 | |
| 813 | if (regnum != -1 && i != regnum) |
| 814 | continue; |
| 815 | |
| 816 | fputs_filtered (reg_names[i], stdout); |
| 817 | print_spaces_filtered (15 - strlen (reg_names[i]), stdout); |
| 818 | |
| 819 | /* Get the data in raw format, then convert also to virtual format. */ |
| 820 | if (read_relative_register_raw_bytes (i, raw_buffer)) |
| 821 | { |
| 822 | printf_filtered ("Invalid register contents\n"); |
| 823 | continue; |
| 824 | } |
| 825 | |
| 826 | target_convert_to_virtual (i, raw_buffer, virtual_buffer); |
| 827 | |
| 828 | /* If virtual format is floating, print it that way, and in raw hex. */ |
| 829 | if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (i)) == TYPE_CODE_FLT |
| 830 | && ! INVALID_FLOAT (virtual_buffer, REGISTER_VIRTUAL_SIZE (i))) |
| 831 | { |
| 832 | register int j; |
| 833 | |
| 834 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, |
| 835 | stdout, 0, 1, 0, Val_pretty_default); |
| 836 | |
| 837 | printf_filtered ("\t(raw 0x"); |
| 838 | for (j = 0; j < REGISTER_RAW_SIZE (i); j++) |
| 839 | printf_filtered ("%02x", (unsigned char)raw_buffer[j]); |
| 840 | printf_filtered (")"); |
| 841 | } |
| 842 | |
| 843 | /* FIXME! val_print probably can handle all of these cases now... */ |
| 844 | |
| 845 | /* Else if virtual format is too long for printf, |
| 846 | print in hex a byte at a time. */ |
| 847 | else if (REGISTER_VIRTUAL_SIZE (i) > sizeof (long)) |
| 848 | { |
| 849 | register int j; |
| 850 | printf_filtered ("0x"); |
| 851 | for (j = 0; j < REGISTER_VIRTUAL_SIZE (i); j++) |
| 852 | printf_filtered ("%02x", (unsigned char)virtual_buffer[j]); |
| 853 | } |
| 854 | /* Else print as integer in hex and in decimal. */ |
| 855 | else |
| 856 | { |
| 857 | val_print (REGISTER_VIRTUAL_TYPE (i), raw_buffer, 0, |
| 858 | stdout, 'x', 1, 0, Val_pretty_default); |
| 859 | printf_filtered ("\t"); |
| 860 | val_print (REGISTER_VIRTUAL_TYPE (i), raw_buffer, 0, |
| 861 | stdout, 0, 1, 0, Val_pretty_default); |
| 862 | } |
| 863 | |
| 864 | /* The SPARC wants to print even-numbered float regs as doubles |
| 865 | in addition to printing them as floats. */ |
| 866 | #ifdef PRINT_REGISTER_HOOK |
| 867 | PRINT_REGISTER_HOOK (i); |
| 868 | #endif |
| 869 | |
| 870 | printf_filtered ("\n"); |
| 871 | } |
| 872 | } |
| 873 | #endif /* no DO_REGISTERS_INFO. */ |
| 874 | |
| 875 | static void |
| 876 | registers_info (addr_exp) |
| 877 | char *addr_exp; |
| 878 | { |
| 879 | int regnum; |
| 880 | |
| 881 | if (!target_has_registers) |
| 882 | error ("The program has no registers now."); |
| 883 | |
| 884 | if (addr_exp) |
| 885 | { |
| 886 | if (*addr_exp >= '0' && *addr_exp <= '9') |
| 887 | regnum = atoi (addr_exp); |
| 888 | else |
| 889 | { |
| 890 | register char *p = addr_exp; |
| 891 | if (p[0] == '$') |
| 892 | p++; |
| 893 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
| 894 | if (!strcmp (p, reg_names[regnum])) |
| 895 | break; |
| 896 | if (regnum == NUM_REGS) |
| 897 | error ("%s: invalid register name.", addr_exp); |
| 898 | } |
| 899 | } |
| 900 | else |
| 901 | regnum = -1; |
| 902 | |
| 903 | DO_REGISTERS_INFO(regnum); |
| 904 | } |
| 905 | \f |
| 906 | /* |
| 907 | * TODO: |
| 908 | * Should save/restore the tty state since it might be that the |
| 909 | * program to be debugged was started on this tty and it wants |
| 910 | * the tty in some state other than what we want. If it's running |
| 911 | * on another terminal or without a terminal, then saving and |
| 912 | * restoring the tty state is a harmless no-op. |
| 913 | * This only needs to be done if we are attaching to a process. |
| 914 | */ |
| 915 | |
| 916 | /* |
| 917 | * attach_command -- |
| 918 | * takes a program started up outside of gdb and ``attaches'' to it. |
| 919 | * This stops it cold in its tracks and allows us to start tracing it. |
| 920 | * For this to work, we must be able to send the process a |
| 921 | * signal and we must have the same effective uid as the program. |
| 922 | */ |
| 923 | void |
| 924 | attach_command (args, from_tty) |
| 925 | char *args; |
| 926 | int from_tty; |
| 927 | { |
| 928 | dont_repeat (); /* Not for the faint of heart */ |
| 929 | target_attach (args, from_tty); |
| 930 | } |
| 931 | |
| 932 | /* |
| 933 | * detach_command -- |
| 934 | * takes a program previously attached to and detaches it. |
| 935 | * The program resumes execution and will no longer stop |
| 936 | * on signals, etc. We better not have left any breakpoints |
| 937 | * in the program or it'll die when it hits one. For this |
| 938 | * to work, it may be necessary for the process to have been |
| 939 | * previously attached. It *might* work if the program was |
| 940 | * started via the normal ptrace (PTRACE_TRACEME). |
| 941 | */ |
| 942 | |
| 943 | static void |
| 944 | detach_command (args, from_tty) |
| 945 | char *args; |
| 946 | int from_tty; |
| 947 | { |
| 948 | dont_repeat (); /* Not for the faint of heart */ |
| 949 | target_detach (args, from_tty); |
| 950 | } |
| 951 | |
| 952 | /* ARGSUSED */ |
| 953 | static void |
| 954 | float_info (addr_exp) |
| 955 | char *addr_exp; |
| 956 | { |
| 957 | #ifdef FLOAT_INFO |
| 958 | FLOAT_INFO; |
| 959 | #else |
| 960 | printf ("No floating point info available for this processor.\n"); |
| 961 | #endif |
| 962 | } |
| 963 | \f |
| 964 | struct cmd_list_element *unsetlist = NULL; |
| 965 | |
| 966 | /* ARGSUSED */ |
| 967 | static void |
| 968 | unset_command (args, from_tty) |
| 969 | char *args; |
| 970 | int from_tty; |
| 971 | { |
| 972 | printf ("\"unset\" must be followed by the name of an unset subcommand.\n"); |
| 973 | help_list (unsetlist, "unset ", -1, stdout); |
| 974 | } |
| 975 | |
| 976 | void |
| 977 | _initialize_infcmd () |
| 978 | { |
| 979 | struct cmd_list_element *c; |
| 980 | |
| 981 | add_com ("tty", class_run, tty_command, |
| 982 | "Set terminal for future runs of program being debugged."); |
| 983 | |
| 984 | add_show_from_set |
| 985 | (add_set_cmd ("args", class_run, var_string_noescape, (char *)&inferior_args, |
| 986 | |
| 987 | "Set arguments to give program being debugged when it is started.\n\ |
| 988 | Follow this command with any number of args, to be passed to the program.", |
| 989 | &setlist), |
| 990 | &showlist); |
| 991 | |
| 992 | c = add_cmd |
| 993 | ("environment", no_class, environment_info, |
| 994 | "The environment to give the program, or one variable's value.\n\ |
| 995 | With an argument VAR, prints the value of environment variable VAR to\n\ |
| 996 | give the program being debugged. With no arguments, prints the entire\n\ |
| 997 | environment to be given to the program.", &showlist); |
| 998 | c->completer = noop_completer; |
| 999 | |
| 1000 | add_prefix_cmd ("unset", no_class, unset_command, |
| 1001 | "Complement to certain \"set\" commands", |
| 1002 | &unsetlist, "unset ", 0, &cmdlist); |
| 1003 | |
| 1004 | c = add_cmd ("environment", class_run, unset_environment_command, |
| 1005 | "Cancel environment variable VAR for the program.\n\ |
| 1006 | This does not affect the program until the next \"run\" command.", |
| 1007 | &unsetlist); |
| 1008 | c->completer = noop_completer; |
| 1009 | |
| 1010 | c = add_cmd ("environment", class_run, set_environment_command, |
| 1011 | "Set environment variable value to give the program.\n\ |
| 1012 | Arguments are VAR VALUE where VAR is variable name and VALUE is value.\n\ |
| 1013 | VALUES of environment variables are uninterpreted strings.\n\ |
| 1014 | This does not affect the program until the next \"run\" command.", |
| 1015 | &setlist); |
| 1016 | c->completer = noop_completer; |
| 1017 | |
| 1018 | add_com ("path", class_files, path_command, |
| 1019 | "Add directory DIR(s) to beginning of search path for object files.\n\ |
| 1020 | $cwd in the path means the current working directory.\n\ |
| 1021 | This path is equivalent to the $PATH shell variable. It is a list of\n\ |
| 1022 | directories, separated by colons. These directories are searched to find\n\ |
| 1023 | fully linked executable files and separately compiled object files as needed."); |
| 1024 | |
| 1025 | add_info ("path", path_info, |
| 1026 | "Current search path for finding object files.\n\ |
| 1027 | $cwd in the path means the current working directory.\n\ |
| 1028 | This path is equivalent to the $PATH shell variable. It is a list of\n\ |
| 1029 | directories, separated by colons. These directories are searched to find\n\ |
| 1030 | fully linked executable files and separately compiled object files as needed."); |
| 1031 | |
| 1032 | add_com ("attach", class_run, attach_command, |
| 1033 | "Attach to a process or file outside of GDB.\n\ |
| 1034 | This command attaches to another target, of the same type as your last\n\ |
| 1035 | `target' command (`info files' will show your target stack).\n\ |
| 1036 | The command may take as argument a process id or a device file.\n\ |
| 1037 | For a process id, you must have permission to send the process a signal,\n\ |
| 1038 | and it must have the same effective uid as the debugger.\n\ |
| 1039 | When using \"attach\", you should use the \"file\" command to specify\n\ |
| 1040 | the program running in the process, and to load its symbol table."); |
| 1041 | |
| 1042 | add_com ("detach", class_run, detach_command, |
| 1043 | "Detach a process or file previously attached.\n\ |
| 1044 | If a process, it is no longer traced, and it continues its execution. If you\n\ |
| 1045 | were debugging a file, the file is closed and gdb no longer accesses it."); |
| 1046 | |
| 1047 | add_com ("signal", class_run, signal_command, |
| 1048 | "Continue program giving it signal number SIGNUMBER."); |
| 1049 | |
| 1050 | add_com ("stepi", class_run, stepi_command, |
| 1051 | "Step one instruction exactly.\n\ |
| 1052 | Argument N means do this N times (or till program stops for another reason)."); |
| 1053 | add_com_alias ("si", "stepi", class_alias, 0); |
| 1054 | |
| 1055 | add_com ("nexti", class_run, nexti_command, |
| 1056 | "Step one instruction, but proceed through subroutine calls.\n\ |
| 1057 | Argument N means do this N times (or till program stops for another reason)."); |
| 1058 | add_com_alias ("ni", "nexti", class_alias, 0); |
| 1059 | |
| 1060 | add_com ("finish", class_run, finish_command, |
| 1061 | "Execute until selected stack frame returns.\n\ |
| 1062 | Upon return, the value returned is printed and put in the value history."); |
| 1063 | |
| 1064 | add_com ("next", class_run, next_command, |
| 1065 | "Step program, proceeding through subroutine calls.\n\ |
| 1066 | Like the \"step\" command as long as subroutine calls do not happen;\n\ |
| 1067 | when they do, the call is treated as one instruction.\n\ |
| 1068 | Argument N means do this N times (or till program stops for another reason)."); |
| 1069 | add_com_alias ("n", "next", class_run, 1); |
| 1070 | |
| 1071 | add_com ("step", class_run, step_command, |
| 1072 | "Step program until it reaches a different source line.\n\ |
| 1073 | Argument N means do this N times (or till program stops for another reason)."); |
| 1074 | add_com_alias ("s", "step", class_run, 1); |
| 1075 | |
| 1076 | add_com ("until", class_run, until_command, |
| 1077 | "Execute until the program reaches a source line greater than the current\n\ |
| 1078 | or a specified line or address or function (same args as break command).\n\ |
| 1079 | Execution will also stop upon exit from the current stack frame."); |
| 1080 | add_com_alias ("u", "until", class_run, 1); |
| 1081 | |
| 1082 | add_com ("jump", class_run, jump_command, |
| 1083 | "Continue program being debugged at specified line or address.\n\ |
| 1084 | Give as argument either LINENUM or *ADDR, where ADDR is an expression\n\ |
| 1085 | for an address to start at."); |
| 1086 | |
| 1087 | add_com ("continue", class_run, continue_command, |
| 1088 | "Continue program being debugged, after signal or breakpoint.\n\ |
| 1089 | If proceeding from breakpoint, a number N may be used as an argument:\n\ |
| 1090 | then the same breakpoint won't break until the Nth time it is reached."); |
| 1091 | add_com_alias ("c", "cont", class_run, 1); |
| 1092 | add_com_alias ("fg", "cont", class_run, 1); |
| 1093 | |
| 1094 | add_com ("run", class_run, run_command, |
| 1095 | "Start debugged program. You may specify arguments to give it.\n\ |
| 1096 | Args may include \"*\", or \"[...]\"; they are expanded using \"sh\".\n\ |
| 1097 | Input and output redirection with \">\", \"<\", or \">>\" are also allowed.\n\n\ |
| 1098 | With no arguments, uses arguments last specified (with \"run\" or \"set args\".\n\ |
| 1099 | To cancel previous arguments and run with no arguments,\n\ |
| 1100 | use \"set args\" without arguments."); |
| 1101 | add_com_alias ("r", "run", class_run, 1); |
| 1102 | |
| 1103 | add_info ("registers", registers_info, |
| 1104 | "List of registers and their contents, for selected stack frame.\n\ |
| 1105 | Register name as argument means describe only that register."); |
| 1106 | |
| 1107 | add_info ("program", program_info, |
| 1108 | "Execution status of the program."); |
| 1109 | |
| 1110 | add_info ("float", float_info, |
| 1111 | "Print the status of the floating point unit\n"); |
| 1112 | |
| 1113 | inferior_args = savestring ("", 1); /* Initially no args */ |
| 1114 | inferior_environ = make_environ (); |
| 1115 | init_environ (inferior_environ); |
| 1116 | } |