| 1 | /* Variables that describe the inferior process running under GDB: |
| 2 | Where it is, why it stopped, and how to step it. |
| 3 | Copyright 1986, 1989, 1992 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | #if !defined (INFERIOR_H) |
| 22 | #define INFERIOR_H 1 |
| 23 | |
| 24 | /* For bpstat. */ |
| 25 | #include "breakpoint.h" |
| 26 | |
| 27 | /* For FRAME_ADDR. */ |
| 28 | #include "frame.h" |
| 29 | |
| 30 | /* |
| 31 | * Structure in which to save the status of the inferior. Save |
| 32 | * through "save_inferior_status", restore through |
| 33 | * "restore_inferior_status". |
| 34 | * This pair of routines should be called around any transfer of |
| 35 | * control to the inferior which you don't want showing up in your |
| 36 | * control variables. |
| 37 | */ |
| 38 | struct inferior_status { |
| 39 | int stop_signal; |
| 40 | CORE_ADDR stop_pc; |
| 41 | FRAME_ADDR stop_frame_address; |
| 42 | bpstat stop_bpstat; |
| 43 | int stop_step; |
| 44 | int stop_stack_dummy; |
| 45 | int stopped_by_random_signal; |
| 46 | int trap_expected; |
| 47 | CORE_ADDR step_range_start; |
| 48 | CORE_ADDR step_range_end; |
| 49 | FRAME_ADDR step_frame_address; |
| 50 | int step_over_calls; |
| 51 | CORE_ADDR step_resume_break_address; |
| 52 | int stop_after_trap; |
| 53 | int stop_soon_quietly; |
| 54 | FRAME_ADDR selected_frame_address; |
| 55 | int selected_level; |
| 56 | char stop_registers[REGISTER_BYTES]; |
| 57 | |
| 58 | /* These are here because if call_function_by_hand has written some |
| 59 | registers and then decides to call error(), we better not have changed |
| 60 | any registers. */ |
| 61 | char registers[REGISTER_BYTES]; |
| 62 | |
| 63 | int breakpoint_proceeded; |
| 64 | int restore_stack_info; |
| 65 | int proceed_to_finish; |
| 66 | }; |
| 67 | |
| 68 | extern void |
| 69 | save_inferior_status PARAMS ((struct inferior_status *, int)); |
| 70 | |
| 71 | extern void |
| 72 | restore_inferior_status PARAMS ((struct inferior_status *)); |
| 73 | |
| 74 | extern void set_sigint_trap PARAMS ((void)); |
| 75 | extern void clear_sigint_trap PARAMS ((void)); |
| 76 | |
| 77 | /* File name for default use for standard in/out in the inferior. */ |
| 78 | |
| 79 | extern char *inferior_io_terminal; |
| 80 | |
| 81 | /* Pid of our debugged inferior, or 0 if no inferior now. */ |
| 82 | |
| 83 | extern int inferior_pid; |
| 84 | |
| 85 | /* Character array containing an image of the inferior programs' registers. */ |
| 86 | |
| 87 | extern char registers[]; |
| 88 | |
| 89 | /* Array of validity bits (one per register). Nonzero at position XXX_REGNUM |
| 90 | means that `registers' contains a valid copy of inferior register XXX. */ |
| 91 | |
| 92 | extern char register_valid[NUM_REGS]; |
| 93 | |
| 94 | extern void |
| 95 | clear_proceed_status PARAMS ((void)); |
| 96 | |
| 97 | extern void |
| 98 | proceed PARAMS ((CORE_ADDR, int, int)); |
| 99 | |
| 100 | extern void |
| 101 | kill_inferior PARAMS ((void)); |
| 102 | |
| 103 | extern void |
| 104 | generic_mourn_inferior PARAMS ((void)); |
| 105 | |
| 106 | extern void |
| 107 | terminal_ours PARAMS ((void)); |
| 108 | |
| 109 | extern int run_stack_dummy PARAMS ((CORE_ADDR, char [REGISTER_BYTES])); |
| 110 | |
| 111 | extern CORE_ADDR |
| 112 | read_pc PARAMS ((void)); |
| 113 | |
| 114 | extern void |
| 115 | write_pc PARAMS ((CORE_ADDR)); |
| 116 | |
| 117 | extern CORE_ADDR |
| 118 | read_sp PARAMS ((void)); |
| 119 | |
| 120 | extern void |
| 121 | write_sp PARAMS ((CORE_ADDR)); |
| 122 | |
| 123 | extern CORE_ADDR |
| 124 | read_fp PARAMS ((void)); |
| 125 | |
| 126 | extern void |
| 127 | write_fp PARAMS ((CORE_ADDR)); |
| 128 | |
| 129 | extern void |
| 130 | wait_for_inferior PARAMS ((void)); |
| 131 | |
| 132 | extern void |
| 133 | init_wait_for_inferior PARAMS ((void)); |
| 134 | |
| 135 | extern void |
| 136 | close_exec_file PARAMS ((void)); |
| 137 | |
| 138 | extern void |
| 139 | reopen_exec_file PARAMS ((void)); |
| 140 | |
| 141 | /* The `resume' routine should only be called in special circumstances. |
| 142 | Normally, use `proceed', which handles a lot of bookkeeping. */ |
| 143 | extern void |
| 144 | resume PARAMS ((int, int)); |
| 145 | |
| 146 | /* From misc files */ |
| 147 | |
| 148 | extern void |
| 149 | store_inferior_registers PARAMS ((int)); |
| 150 | |
| 151 | extern void |
| 152 | fetch_inferior_registers PARAMS ((int)); |
| 153 | |
| 154 | extern void |
| 155 | solib_create_inferior_hook PARAMS ((void)); |
| 156 | |
| 157 | extern void |
| 158 | child_terminal_info PARAMS ((char *, int)); |
| 159 | |
| 160 | extern void |
| 161 | term_info PARAMS ((char *, int)); |
| 162 | |
| 163 | extern void |
| 164 | terminal_ours_for_output PARAMS ((void)); |
| 165 | |
| 166 | extern void |
| 167 | terminal_inferior PARAMS ((void)); |
| 168 | |
| 169 | extern void |
| 170 | terminal_init_inferior PARAMS ((void)); |
| 171 | |
| 172 | /* From infptrace.c */ |
| 173 | |
| 174 | extern int |
| 175 | attach PARAMS ((int)); |
| 176 | |
| 177 | void |
| 178 | detach PARAMS ((int)); |
| 179 | |
| 180 | extern void |
| 181 | child_resume PARAMS ((int, int, int)); |
| 182 | |
| 183 | #ifndef PTRACE_ARG3_TYPE |
| 184 | #define PTRACE_ARG3_TYPE int /* Correct definition for most systems. */ |
| 185 | #endif |
| 186 | |
| 187 | extern int |
| 188 | call_ptrace PARAMS ((int, int, PTRACE_ARG3_TYPE, int)); |
| 189 | |
| 190 | /* From procfs.c */ |
| 191 | |
| 192 | extern int |
| 193 | proc_iterate_over_mappings PARAMS ((int (*) (int, CORE_ADDR))); |
| 194 | |
| 195 | /* From fork-child.c */ |
| 196 | |
| 197 | extern void |
| 198 | fork_inferior PARAMS ((char *, char *, char **, |
| 199 | void (*) (void), |
| 200 | void (*) (int))); |
| 201 | |
| 202 | /* From inflow.c */ |
| 203 | |
| 204 | extern void |
| 205 | new_tty_prefork PARAMS ((char *)); |
| 206 | |
| 207 | extern int gdb_has_a_terminal PARAMS ((void)); |
| 208 | |
| 209 | /* From infrun.c */ |
| 210 | |
| 211 | extern void |
| 212 | start_remote PARAMS ((void)); |
| 213 | |
| 214 | extern void |
| 215 | normal_stop PARAMS ((void)); |
| 216 | |
| 217 | extern int |
| 218 | signal_stop_state PARAMS ((int)); |
| 219 | |
| 220 | extern int |
| 221 | signal_print_state PARAMS ((int)); |
| 222 | |
| 223 | extern int |
| 224 | signal_pass_state PARAMS ((int)); |
| 225 | |
| 226 | /* From infcmd.c */ |
| 227 | |
| 228 | extern void |
| 229 | tty_command PARAMS ((char *, int)); |
| 230 | |
| 231 | extern void |
| 232 | attach_command PARAMS ((char *, int)); |
| 233 | |
| 234 | /* Last signal that the inferior received (why it stopped). */ |
| 235 | |
| 236 | extern int stop_signal; |
| 237 | |
| 238 | /* Address at which inferior stopped. */ |
| 239 | |
| 240 | extern CORE_ADDR stop_pc; |
| 241 | |
| 242 | /* Stack frame when program stopped. */ |
| 243 | |
| 244 | extern FRAME_ADDR stop_frame_address; |
| 245 | |
| 246 | /* Chain containing status of breakpoint(s) that we have stopped at. */ |
| 247 | |
| 248 | extern bpstat stop_bpstat; |
| 249 | |
| 250 | /* Flag indicating that a command has proceeded the inferior past the |
| 251 | current breakpoint. */ |
| 252 | |
| 253 | extern int breakpoint_proceeded; |
| 254 | |
| 255 | /* Nonzero if stopped due to a step command. */ |
| 256 | |
| 257 | extern int stop_step; |
| 258 | |
| 259 | /* Nonzero if stopped due to completion of a stack dummy routine. */ |
| 260 | |
| 261 | extern int stop_stack_dummy; |
| 262 | |
| 263 | /* Nonzero if program stopped due to a random (unexpected) signal in |
| 264 | inferior process. */ |
| 265 | |
| 266 | extern int stopped_by_random_signal; |
| 267 | |
| 268 | /* Range to single step within. |
| 269 | If this is nonzero, respond to a single-step signal |
| 270 | by continuing to step if the pc is in this range. |
| 271 | |
| 272 | If step_range_start and step_range_end are both 1, it means to step for |
| 273 | a single instruction (FIXME: it might clean up wait_for_inferior in a |
| 274 | minor way if this were changed to the address of the instruction and |
| 275 | that address plus one. But maybe not.). */ |
| 276 | |
| 277 | extern CORE_ADDR step_range_start; /* Inclusive */ |
| 278 | extern CORE_ADDR step_range_end; /* Exclusive */ |
| 279 | |
| 280 | /* Stack frame address as of when stepping command was issued. |
| 281 | This is how we know when we step into a subroutine call, |
| 282 | and how to set the frame for the breakpoint used to step out. */ |
| 283 | |
| 284 | extern FRAME_ADDR step_frame_address; |
| 285 | |
| 286 | /* 1 means step over all subroutine calls. |
| 287 | -1 means step over calls to undebuggable functions. */ |
| 288 | |
| 289 | extern int step_over_calls; |
| 290 | |
| 291 | /* If stepping, nonzero means step count is > 1 |
| 292 | so don't print frame next time inferior stops |
| 293 | if it stops due to stepping. */ |
| 294 | |
| 295 | extern int step_multi; |
| 296 | |
| 297 | /* Nonzero means expecting a trap and caller will handle it themselves. |
| 298 | It is used after attach, due to attaching to a process; |
| 299 | when running in the shell before the child program has been exec'd; |
| 300 | and when running some kinds of remote stuff (FIXME?). */ |
| 301 | |
| 302 | extern int stop_soon_quietly; |
| 303 | |
| 304 | /* Nonzero if proceed is being used for a "finish" command or a similar |
| 305 | situation when stop_registers should be saved. */ |
| 306 | |
| 307 | extern int proceed_to_finish; |
| 308 | |
| 309 | /* Save register contents here when about to pop a stack dummy frame, |
| 310 | if-and-only-if proceed_to_finish is set. |
| 311 | Thus this contains the return value from the called function (assuming |
| 312 | values are returned in a register). */ |
| 313 | |
| 314 | extern char stop_registers[REGISTER_BYTES]; |
| 315 | |
| 316 | /* Nonzero if the child process in inferior_pid was attached rather |
| 317 | than forked. */ |
| 318 | |
| 319 | extern int attach_flag; |
| 320 | \f |
| 321 | /* Sigtramp is a routine that the kernel calls (which then calls the |
| 322 | signal handler). On most machines it is a library routine that |
| 323 | is linked into the executable. |
| 324 | |
| 325 | This macro, given a program counter value and the name of the |
| 326 | function in which that PC resides (which can be null if the |
| 327 | name is not known), returns nonzero if the PC and name show |
| 328 | that we are in sigtramp. |
| 329 | |
| 330 | On most machines just see if the name is sigtramp (and if we have |
| 331 | no name, assume we are not in sigtramp). */ |
| 332 | #if !defined (IN_SIGTRAMP) |
| 333 | # if defined (SIGTRAMP_START) |
| 334 | # define IN_SIGTRAMP(pc, name) \ |
| 335 | ((pc) >= SIGTRAMP_START \ |
| 336 | && (pc) < SIGTRAMP_END \ |
| 337 | ) |
| 338 | # else |
| 339 | # define IN_SIGTRAMP(pc, name) \ |
| 340 | (name && STREQ ("_sigtramp", name)) |
| 341 | # endif |
| 342 | #endif |
| 343 | \f |
| 344 | /* Possible values for CALL_DUMMY_LOCATION. */ |
| 345 | #define ON_STACK 1 |
| 346 | #define BEFORE_TEXT_END 2 |
| 347 | #define AFTER_TEXT_END 3 |
| 348 | #define AT_ENTRY_POINT 4 |
| 349 | |
| 350 | #if !defined (CALL_DUMMY_LOCATION) |
| 351 | #define CALL_DUMMY_LOCATION ON_STACK |
| 352 | #endif /* No CALL_DUMMY_LOCATION. */ |
| 353 | |
| 354 | /* Are we in a call dummy? The code below which allows DECR_PC_AFTER_BREAK |
| 355 | below is for infrun.c, which may give the macro a pc without that |
| 356 | subtracted out. */ |
| 357 | #if !defined (PC_IN_CALL_DUMMY) |
| 358 | #if CALL_DUMMY_LOCATION == BEFORE_TEXT_END |
| 359 | extern CORE_ADDR text_end; |
| 360 | #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \ |
| 361 | ((pc) >= text_end - CALL_DUMMY_LENGTH \ |
| 362 | && (pc) <= text_end + DECR_PC_AFTER_BREAK) |
| 363 | #endif /* Before text_end. */ |
| 364 | |
| 365 | #if CALL_DUMMY_LOCATION == AFTER_TEXT_END |
| 366 | extern CORE_ADDR text_end; |
| 367 | #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \ |
| 368 | ((pc) >= text_end \ |
| 369 | && (pc) <= text_end + CALL_DUMMY_LENGTH + DECR_PC_AFTER_BREAK) |
| 370 | #endif /* After text_end. */ |
| 371 | |
| 372 | #if CALL_DUMMY_LOCATION == ON_STACK |
| 373 | /* Is the PC in a call dummy? SP and FRAME_ADDRESS are the bottom and |
| 374 | top of the stack frame which we are checking, where "bottom" and |
| 375 | "top" refer to some section of memory which contains the code for |
| 376 | the call dummy. Calls to this macro assume that the contents of |
| 377 | SP_REGNUM and FP_REGNUM (or the saved values thereof), respectively, |
| 378 | are the things to pass. |
| 379 | |
| 380 | This won't work on the 29k, where SP_REGNUM and FP_REGNUM don't |
| 381 | have that meaning, but the 29k doesn't use ON_STACK. This could be |
| 382 | fixed by generalizing this scheme, perhaps by passing in a frame |
| 383 | and adding a few fields, at least on machines which need them for |
| 384 | PC_IN_CALL_DUMMY. |
| 385 | |
| 386 | Something simpler, like checking for the stack segment, doesn't work, |
| 387 | since various programs (threads implementations, gcc nested function |
| 388 | stubs, etc) may either allocate stack frames in another segment, or |
| 389 | allocate other kinds of code on the stack. */ |
| 390 | |
| 391 | #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \ |
| 392 | ((sp) INNER_THAN (pc) && (frame_address != 0) && (pc) INNER_THAN (frame_address)) |
| 393 | #endif /* On stack. */ |
| 394 | |
| 395 | #if CALL_DUMMY_LOCATION == AT_ENTRY_POINT |
| 396 | extern CORE_ADDR |
| 397 | entry_point_address PARAMS ((void)); |
| 398 | #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \ |
| 399 | ((pc) >= entry_point_address () \ |
| 400 | && (pc) <= (entry_point_address () + DECR_PC_AFTER_BREAK)) |
| 401 | #endif /* At entry point. */ |
| 402 | #endif /* No PC_IN_CALL_DUMMY. */ |
| 403 | |
| 404 | #endif /* !defined (INFERIOR_H) */ |