| /* Target-struct-independent code to start (run) and stop an inferior |
| process. |
| |
| Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, |
| 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free |
| Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "gdb_string.h" |
| #include <ctype.h> |
| #include "symtab.h" |
| #include "frame.h" |
| #include "inferior.h" |
| #include "exceptions.h" |
| #include "breakpoint.h" |
| #include "gdb_wait.h" |
| #include "gdbcore.h" |
| #include "gdbcmd.h" |
| #include "cli/cli-script.h" |
| #include "target.h" |
| #include "gdbthread.h" |
| #include "annotate.h" |
| #include "symfile.h" |
| #include "top.h" |
| #include <signal.h> |
| #include "inf-loop.h" |
| #include "regcache.h" |
| #include "value.h" |
| #include "observer.h" |
| #include "language.h" |
| #include "gdb_assert.h" |
| |
| /* Prototypes for local functions */ |
| |
| static void signals_info (char *, int); |
| |
| static void handle_command (char *, int); |
| |
| static void sig_print_info (enum target_signal); |
| |
| static void sig_print_header (void); |
| |
| static void resume_cleanups (void *); |
| |
| static int hook_stop_stub (void *); |
| |
| static int restore_selected_frame (void *); |
| |
| static void build_infrun (void); |
| |
| static int follow_fork (void); |
| |
| static void set_schedlock_func (char *args, int from_tty, |
| struct cmd_list_element *c); |
| |
| struct execution_control_state; |
| |
| static int currently_stepping (struct execution_control_state *ecs); |
| |
| static void xdb_handle_command (char *args, int from_tty); |
| |
| static int prepare_to_proceed (void); |
| |
| void _initialize_infrun (void); |
| |
| int inferior_ignoring_startup_exec_events = 0; |
| int inferior_ignoring_leading_exec_events = 0; |
| |
| /* When set, stop the 'step' command if we enter a function which has |
| no line number information. The normal behavior is that we step |
| over such function. */ |
| int step_stop_if_no_debug = 0; |
| |
| /* In asynchronous mode, but simulating synchronous execution. */ |
| |
| int sync_execution = 0; |
| |
| /* wait_for_inferior and normal_stop use this to notify the user |
| when the inferior stopped in a different thread than it had been |
| running in. */ |
| |
| static ptid_t previous_inferior_ptid; |
| |
| /* This is true for configurations that may follow through execl() and |
| similar functions. At present this is only true for HP-UX native. */ |
| |
| #ifndef MAY_FOLLOW_EXEC |
| #define MAY_FOLLOW_EXEC (0) |
| #endif |
| |
| static int may_follow_exec = MAY_FOLLOW_EXEC; |
| |
| static int debug_infrun = 0; |
| |
| /* If the program uses ELF-style shared libraries, then calls to |
| functions in shared libraries go through stubs, which live in a |
| table called the PLT (Procedure Linkage Table). The first time the |
| function is called, the stub sends control to the dynamic linker, |
| which looks up the function's real address, patches the stub so |
| that future calls will go directly to the function, and then passes |
| control to the function. |
| |
| If we are stepping at the source level, we don't want to see any of |
| this --- we just want to skip over the stub and the dynamic linker. |
| The simple approach is to single-step until control leaves the |
| dynamic linker. |
| |
| However, on some systems (e.g., Red Hat's 5.2 distribution) the |
| dynamic linker calls functions in the shared C library, so you |
| can't tell from the PC alone whether the dynamic linker is still |
| running. In this case, we use a step-resume breakpoint to get us |
| past the dynamic linker, as if we were using "next" to step over a |
| function call. |
| |
| IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic |
| linker code or not. Normally, this means we single-step. However, |
| if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an |
| address where we can place a step-resume breakpoint to get past the |
| linker's symbol resolution function. |
| |
| IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a |
| pretty portable way, by comparing the PC against the address ranges |
| of the dynamic linker's sections. |
| |
| SKIP_SOLIB_RESOLVER is generally going to be system-specific, since |
| it depends on internal details of the dynamic linker. It's usually |
| not too hard to figure out where to put a breakpoint, but it |
| certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of |
| sanity checking. If it can't figure things out, returning zero and |
| getting the (possibly confusing) stepping behavior is better than |
| signalling an error, which will obscure the change in the |
| inferior's state. */ |
| |
| #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE |
| #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 |
| #endif |
| |
| /* This function returns TRUE if pc is the address of an instruction |
| that lies within the dynamic linker (such as the event hook, or the |
| dld itself). |
| |
| This function must be used only when a dynamic linker event has |
| been caught, and the inferior is being stepped out of the hook, or |
| undefined results are guaranteed. */ |
| |
| #ifndef SOLIB_IN_DYNAMIC_LINKER |
| #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 |
| #endif |
| |
| /* We can't step off a permanent breakpoint in the ordinary way, because we |
| can't remove it. Instead, we have to advance the PC to the next |
| instruction. This macro should expand to a pointer to a function that |
| does that, or zero if we have no such function. If we don't have a |
| definition for it, we have to report an error. */ |
| #ifndef SKIP_PERMANENT_BREAKPOINT |
| #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) |
| static void |
| default_skip_permanent_breakpoint (void) |
| { |
| error ("\ |
| The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
| how to step past a permanent breakpoint on this architecture. Try using\n\ |
| a command like `return' or `jump' to continue execution."); |
| } |
| #endif |
| |
| |
| /* Convert the #defines into values. This is temporary until wfi control |
| flow is completely sorted out. */ |
| |
| #ifndef HAVE_STEPPABLE_WATCHPOINT |
| #define HAVE_STEPPABLE_WATCHPOINT 0 |
| #else |
| #undef HAVE_STEPPABLE_WATCHPOINT |
| #define HAVE_STEPPABLE_WATCHPOINT 1 |
| #endif |
| |
| #ifndef CANNOT_STEP_HW_WATCHPOINTS |
| #define CANNOT_STEP_HW_WATCHPOINTS 0 |
| #else |
| #undef CANNOT_STEP_HW_WATCHPOINTS |
| #define CANNOT_STEP_HW_WATCHPOINTS 1 |
| #endif |
| |
| /* Tables of how to react to signals; the user sets them. */ |
| |
| static unsigned char *signal_stop; |
| static unsigned char *signal_print; |
| static unsigned char *signal_program; |
| |
| #define SET_SIGS(nsigs,sigs,flags) \ |
| do { \ |
| int signum = (nsigs); \ |
| while (signum-- > 0) \ |
| if ((sigs)[signum]) \ |
| (flags)[signum] = 1; \ |
| } while (0) |
| |
| #define UNSET_SIGS(nsigs,sigs,flags) \ |
| do { \ |
| int signum = (nsigs); \ |
| while (signum-- > 0) \ |
| if ((sigs)[signum]) \ |
| (flags)[signum] = 0; \ |
| } while (0) |
| |
| /* Value to pass to target_resume() to cause all threads to resume */ |
| |
| #define RESUME_ALL (pid_to_ptid (-1)) |
| |
| /* Command list pointer for the "stop" placeholder. */ |
| |
| static struct cmd_list_element *stop_command; |
| |
| /* Nonzero if breakpoints are now inserted in the inferior. */ |
| |
| static int breakpoints_inserted; |
| |
| /* Function inferior was in as of last step command. */ |
| |
| static struct symbol *step_start_function; |
| |
| /* Nonzero if we are expecting a trace trap and should proceed from it. */ |
| |
| static int trap_expected; |
| |
| #ifdef SOLIB_ADD |
| /* Nonzero if we want to give control to the user when we're notified |
| of shared library events by the dynamic linker. */ |
| static int stop_on_solib_events; |
| #endif |
| |
| /* Nonzero means expecting a trace trap |
| and should stop the inferior and return silently when it happens. */ |
| |
| int stop_after_trap; |
| |
| /* Nonzero means expecting a trap and caller will handle it themselves. |
| It is used after attach, due to attaching to a process; |
| when running in the shell before the child program has been exec'd; |
| and when running some kinds of remote stuff (FIXME?). */ |
| |
| enum stop_kind stop_soon; |
| |
| /* Nonzero if proceed is being used for a "finish" command or a similar |
| situation when stop_registers should be saved. */ |
| |
| int proceed_to_finish; |
| |
| /* Save register contents here when about to pop a stack dummy frame, |
| if-and-only-if proceed_to_finish is set. |
| Thus this contains the return value from the called function (assuming |
| values are returned in a register). */ |
| |
| struct regcache *stop_registers; |
| |
| /* Nonzero if program stopped due to error trying to insert breakpoints. */ |
| |
| static int breakpoints_failed; |
| |
| /* Nonzero after stop if current stack frame should be printed. */ |
| |
| static int stop_print_frame; |
| |
| static struct breakpoint *step_resume_breakpoint = NULL; |
| |
| /* This is a cached copy of the pid/waitstatus of the last event |
| returned by target_wait()/deprecated_target_wait_hook(). This |
| information is returned by get_last_target_status(). */ |
| static ptid_t target_last_wait_ptid; |
| static struct target_waitstatus target_last_waitstatus; |
| |
| /* This is used to remember when a fork, vfork or exec event |
| was caught by a catchpoint, and thus the event is to be |
| followed at the next resume of the inferior, and not |
| immediately. */ |
| static struct |
| { |
| enum target_waitkind kind; |
| struct |
| { |
| int parent_pid; |
| int child_pid; |
| } |
| fork_event; |
| char *execd_pathname; |
| } |
| pending_follow; |
| |
| static const char follow_fork_mode_child[] = "child"; |
| static const char follow_fork_mode_parent[] = "parent"; |
| |
| static const char *follow_fork_mode_kind_names[] = { |
| follow_fork_mode_child, |
| follow_fork_mode_parent, |
| NULL |
| }; |
| |
| static const char *follow_fork_mode_string = follow_fork_mode_parent; |
| |
| |
| static int |
| follow_fork (void) |
| { |
| int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
| |
| return target_follow_fork (follow_child); |
| } |
| |
| void |
| follow_inferior_reset_breakpoints (void) |
| { |
| /* Was there a step_resume breakpoint? (There was if the user |
| did a "next" at the fork() call.) If so, explicitly reset its |
| thread number. |
| |
| step_resumes are a form of bp that are made to be per-thread. |
| Since we created the step_resume bp when the parent process |
| was being debugged, and now are switching to the child process, |
| from the breakpoint package's viewpoint, that's a switch of |
| "threads". We must update the bp's notion of which thread |
| it is for, or it'll be ignored when it triggers. */ |
| |
| if (step_resume_breakpoint) |
| breakpoint_re_set_thread (step_resume_breakpoint); |
| |
| /* Reinsert all breakpoints in the child. The user may have set |
| breakpoints after catching the fork, in which case those |
| were never set in the child, but only in the parent. This makes |
| sure the inserted breakpoints match the breakpoint list. */ |
| |
| breakpoint_re_set (); |
| insert_breakpoints (); |
| } |
| |
| /* EXECD_PATHNAME is assumed to be non-NULL. */ |
| |
| static void |
| follow_exec (int pid, char *execd_pathname) |
| { |
| int saved_pid = pid; |
| struct target_ops *tgt; |
| |
| if (!may_follow_exec) |
| return; |
| |
| /* This is an exec event that we actually wish to pay attention to. |
| Refresh our symbol table to the newly exec'd program, remove any |
| momentary bp's, etc. |
| |
| If there are breakpoints, they aren't really inserted now, |
| since the exec() transformed our inferior into a fresh set |
| of instructions. |
| |
| We want to preserve symbolic breakpoints on the list, since |
| we have hopes that they can be reset after the new a.out's |
| symbol table is read. |
| |
| However, any "raw" breakpoints must be removed from the list |
| (e.g., the solib bp's), since their address is probably invalid |
| now. |
| |
| And, we DON'T want to call delete_breakpoints() here, since |
| that may write the bp's "shadow contents" (the instruction |
| value that was overwritten witha TRAP instruction). Since |
| we now have a new a.out, those shadow contents aren't valid. */ |
| update_breakpoints_after_exec (); |
| |
| /* If there was one, it's gone now. We cannot truly step-to-next |
| statement through an exec(). */ |
| step_resume_breakpoint = NULL; |
| step_range_start = 0; |
| step_range_end = 0; |
| |
| /* What is this a.out's name? */ |
| printf_unfiltered ("Executing new program: %s\n", execd_pathname); |
| |
| /* We've followed the inferior through an exec. Therefore, the |
| inferior has essentially been killed & reborn. */ |
| |
| /* First collect the run target in effect. */ |
| tgt = find_run_target (); |
| /* If we can't find one, things are in a very strange state... */ |
| if (tgt == NULL) |
| error ("Could find run target to save before following exec"); |
| |
| gdb_flush (gdb_stdout); |
| target_mourn_inferior (); |
| inferior_ptid = pid_to_ptid (saved_pid); |
| /* Because mourn_inferior resets inferior_ptid. */ |
| push_target (tgt); |
| |
| /* That a.out is now the one to use. */ |
| exec_file_attach (execd_pathname, 0); |
| |
| /* And also is where symbols can be found. */ |
| symbol_file_add_main (execd_pathname, 0); |
| |
| /* Reset the shared library package. This ensures that we get |
| a shlib event when the child reaches "_start", at which point |
| the dld will have had a chance to initialize the child. */ |
| #if defined(SOLIB_RESTART) |
| SOLIB_RESTART (); |
| #endif |
| #ifdef SOLIB_CREATE_INFERIOR_HOOK |
| SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
| #endif |
| |
| /* Reinsert all breakpoints. (Those which were symbolic have |
| been reset to the proper address in the new a.out, thanks |
| to symbol_file_command...) */ |
| insert_breakpoints (); |
| |
| /* The next resume of this inferior should bring it to the shlib |
| startup breakpoints. (If the user had also set bp's on |
| "main" from the old (parent) process, then they'll auto- |
| matically get reset there in the new process.) */ |
| } |
| |
| /* Non-zero if we just simulating a single-step. This is needed |
| because we cannot remove the breakpoints in the inferior process |
| until after the `wait' in `wait_for_inferior'. */ |
| static int singlestep_breakpoints_inserted_p = 0; |
| |
| /* The thread we inserted single-step breakpoints for. */ |
| static ptid_t singlestep_ptid; |
| |
| /* If another thread hit the singlestep breakpoint, we save the original |
| thread here so that we can resume single-stepping it later. */ |
| static ptid_t saved_singlestep_ptid; |
| static int stepping_past_singlestep_breakpoint; |
| |
| |
| /* Things to clean up if we QUIT out of resume (). */ |
| static void |
| resume_cleanups (void *ignore) |
| { |
| normal_stop (); |
| } |
| |
| static const char schedlock_off[] = "off"; |
| static const char schedlock_on[] = "on"; |
| static const char schedlock_step[] = "step"; |
| static const char *scheduler_mode = schedlock_off; |
| static const char *scheduler_enums[] = { |
| schedlock_off, |
| schedlock_on, |
| schedlock_step, |
| NULL |
| }; |
| |
| static void |
| set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
| { |
| /* NOTE: cagney/2002-03-17: The deprecated_add_show_from_set() |
| function clones the set command passed as a parameter. The clone |
| operation will include (BUG?) any ``set'' command callback, if |
| present. Commands like ``info set'' call all the ``show'' |
| command callbacks. Unfortunately, for ``show'' commands cloned |
| from ``set'', this includes callbacks belonging to ``set'' |
| commands. Making this worse, this only occures if |
| deprecated_add_show_from_set() is called after add_cmd_sfunc() |
| (BUG?). */ |
| if (cmd_type (c) == set_cmd) |
| if (!target_can_lock_scheduler) |
| { |
| scheduler_mode = schedlock_off; |
| error ("Target '%s' cannot support this command.", target_shortname); |
| } |
| } |
| |
| |
| /* Resume the inferior, but allow a QUIT. This is useful if the user |
| wants to interrupt some lengthy single-stepping operation |
| (for child processes, the SIGINT goes to the inferior, and so |
| we get a SIGINT random_signal, but for remote debugging and perhaps |
| other targets, that's not true). |
| |
| STEP nonzero if we should step (zero to continue instead). |
| SIG is the signal to give the inferior (zero for none). */ |
| void |
| resume (int step, enum target_signal sig) |
| { |
| int should_resume = 1; |
| struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
| QUIT; |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n", |
| step, sig); |
| |
| /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
| |
| |
| /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
| over an instruction that causes a page fault without triggering |
| a hardware watchpoint. The kernel properly notices that it shouldn't |
| stop, because the hardware watchpoint is not triggered, but it forgets |
| the step request and continues the program normally. |
| Work around the problem by removing hardware watchpoints if a step is |
| requested, GDB will check for a hardware watchpoint trigger after the |
| step anyway. */ |
| if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) |
| remove_hw_watchpoints (); |
| |
| |
| /* Normally, by the time we reach `resume', the breakpoints are either |
| removed or inserted, as appropriate. The exception is if we're sitting |
| at a permanent breakpoint; we need to step over it, but permanent |
| breakpoints can't be removed. So we have to test for it here. */ |
| if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) |
| SKIP_PERMANENT_BREAKPOINT (); |
| |
| if (SOFTWARE_SINGLE_STEP_P () && step) |
| { |
| /* Do it the hard way, w/temp breakpoints */ |
| SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
| /* ...and don't ask hardware to do it. */ |
| step = 0; |
| /* and do not pull these breakpoints until after a `wait' in |
| `wait_for_inferior' */ |
| singlestep_breakpoints_inserted_p = 1; |
| singlestep_ptid = inferior_ptid; |
| } |
| |
| /* If there were any forks/vforks/execs that were caught and are |
| now to be followed, then do so. */ |
| switch (pending_follow.kind) |
| { |
| case TARGET_WAITKIND_FORKED: |
| case TARGET_WAITKIND_VFORKED: |
| pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| if (follow_fork ()) |
| should_resume = 0; |
| break; |
| |
| case TARGET_WAITKIND_EXECD: |
| /* follow_exec is called as soon as the exec event is seen. */ |
| pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| break; |
| |
| default: |
| break; |
| } |
| |
| /* Install inferior's terminal modes. */ |
| target_terminal_inferior (); |
| |
| if (should_resume) |
| { |
| ptid_t resume_ptid; |
| |
| resume_ptid = RESUME_ALL; /* Default */ |
| |
| if ((step || singlestep_breakpoints_inserted_p) |
| && (stepping_past_singlestep_breakpoint |
| || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) |
| { |
| /* Stepping past a breakpoint without inserting breakpoints. |
| Make sure only the current thread gets to step, so that |
| other threads don't sneak past breakpoints while they are |
| not inserted. */ |
| |
| resume_ptid = inferior_ptid; |
| } |
| |
| if ((scheduler_mode == schedlock_on) |
| || (scheduler_mode == schedlock_step |
| && (step || singlestep_breakpoints_inserted_p))) |
| { |
| /* User-settable 'scheduler' mode requires solo thread resume. */ |
| resume_ptid = inferior_ptid; |
| } |
| |
| if (CANNOT_STEP_BREAKPOINT) |
| { |
| /* Most targets can step a breakpoint instruction, thus |
| executing it normally. But if this one cannot, just |
| continue and we will hit it anyway. */ |
| if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) |
| step = 0; |
| } |
| target_resume (resume_ptid, step, sig); |
| } |
| |
| discard_cleanups (old_cleanups); |
| } |
| |
| |
| /* Clear out all variables saying what to do when inferior is continued. |
| First do this, then set the ones you want, then call `proceed'. */ |
| |
| void |
| clear_proceed_status (void) |
| { |
| trap_expected = 0; |
| step_range_start = 0; |
| step_range_end = 0; |
| step_frame_id = null_frame_id; |
| step_over_calls = STEP_OVER_UNDEBUGGABLE; |
| stop_after_trap = 0; |
| stop_soon = NO_STOP_QUIETLY; |
| proceed_to_finish = 0; |
| breakpoint_proceeded = 1; /* We're about to proceed... */ |
| |
| /* Discard any remaining commands or status from previous stop. */ |
| bpstat_clear (&stop_bpstat); |
| } |
| |
| /* This should be suitable for any targets that support threads. */ |
| |
| static int |
| prepare_to_proceed (void) |
| { |
| ptid_t wait_ptid; |
| struct target_waitstatus wait_status; |
| |
| /* Get the last target status returned by target_wait(). */ |
| get_last_target_status (&wait_ptid, &wait_status); |
| |
| /* Make sure we were stopped either at a breakpoint, or because |
| of a Ctrl-C. */ |
| if (wait_status.kind != TARGET_WAITKIND_STOPPED |
| || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
| && wait_status.value.sig != TARGET_SIGNAL_INT)) |
| { |
| return 0; |
| } |
| |
| if (!ptid_equal (wait_ptid, minus_one_ptid) |
| && !ptid_equal (inferior_ptid, wait_ptid)) |
| { |
| /* Switched over from WAIT_PID. */ |
| CORE_ADDR wait_pc = read_pc_pid (wait_ptid); |
| |
| if (wait_pc != read_pc ()) |
| { |
| /* Switch back to WAIT_PID thread. */ |
| inferior_ptid = wait_ptid; |
| |
| /* FIXME: This stuff came from switch_to_thread() in |
| thread.c (which should probably be a public function). */ |
| flush_cached_frames (); |
| registers_changed (); |
| stop_pc = wait_pc; |
| select_frame (get_current_frame ()); |
| } |
| |
| /* We return 1 to indicate that there is a breakpoint here, |
| so we need to step over it before continuing to avoid |
| hitting it straight away. */ |
| if (breakpoint_here_p (wait_pc)) |
| return 1; |
| } |
| |
| return 0; |
| |
| } |
| |
| /* Record the pc of the program the last time it stopped. This is |
| just used internally by wait_for_inferior, but need to be preserved |
| over calls to it and cleared when the inferior is started. */ |
| static CORE_ADDR prev_pc; |
| |
| /* Basic routine for continuing the program in various fashions. |
| |
| ADDR is the address to resume at, or -1 for resume where stopped. |
| SIGGNAL is the signal to give it, or 0 for none, |
| or -1 for act according to how it stopped. |
| STEP is nonzero if should trap after one instruction. |
| -1 means return after that and print nothing. |
| You should probably set various step_... variables |
| before calling here, if you are stepping. |
| |
| You should call clear_proceed_status before calling proceed. */ |
| |
| void |
| proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
| { |
| int oneproc = 0; |
| |
| if (step > 0) |
| step_start_function = find_pc_function (read_pc ()); |
| if (step < 0) |
| stop_after_trap = 1; |
| |
| if (addr == (CORE_ADDR) -1) |
| { |
| if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
| /* There is a breakpoint at the address we will resume at, |
| step one instruction before inserting breakpoints so that |
| we do not stop right away (and report a second hit at this |
| breakpoint). */ |
| oneproc = 1; |
| else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
| && gdbarch_single_step_through_delay (current_gdbarch, |
| get_current_frame ())) |
| /* We stepped onto an instruction that needs to be stepped |
| again before re-inserting the breakpoint, do so. */ |
| oneproc = 1; |
| } |
| else |
| { |
| write_pc (addr); |
| } |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, |
| "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", |
| paddr_nz (addr), siggnal, step); |
| |
| /* In a multi-threaded task we may select another thread |
| and then continue or step. |
| |
| But if the old thread was stopped at a breakpoint, it |
| will immediately cause another breakpoint stop without |
| any execution (i.e. it will report a breakpoint hit |
| incorrectly). So we must step over it first. |
| |
| prepare_to_proceed checks the current thread against the thread |
| that reported the most recent event. If a step-over is required |
| it returns TRUE and sets the current thread to the old thread. */ |
| if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
| oneproc = 1; |
| |
| if (oneproc) |
| /* We will get a trace trap after one instruction. |
| Continue it automatically and insert breakpoints then. */ |
| trap_expected = 1; |
| else |
| { |
| insert_breakpoints (); |
| /* If we get here there was no call to error() in |
| insert breakpoints -- so they were inserted. */ |
| breakpoints_inserted = 1; |
| } |
| |
| if (siggnal != TARGET_SIGNAL_DEFAULT) |
| stop_signal = siggnal; |
| /* If this signal should not be seen by program, |
| give it zero. Used for debugging signals. */ |
| else if (!signal_program[stop_signal]) |
| stop_signal = TARGET_SIGNAL_0; |
| |
| annotate_starting (); |
| |
| /* Make sure that output from GDB appears before output from the |
| inferior. */ |
| gdb_flush (gdb_stdout); |
| |
| /* Refresh prev_pc value just prior to resuming. This used to be |
| done in stop_stepping, however, setting prev_pc there did not handle |
| scenarios such as inferior function calls or returning from |
| a function via the return command. In those cases, the prev_pc |
| value was not set properly for subsequent commands. The prev_pc value |
| is used to initialize the starting line number in the ecs. With an |
| invalid value, the gdb next command ends up stopping at the position |
| represented by the next line table entry past our start position. |
| On platforms that generate one line table entry per line, this |
| is not a problem. However, on the ia64, the compiler generates |
| extraneous line table entries that do not increase the line number. |
| When we issue the gdb next command on the ia64 after an inferior call |
| or a return command, we often end up a few instructions forward, still |
| within the original line we started. |
| |
| An attempt was made to have init_execution_control_state () refresh |
| the prev_pc value before calculating the line number. This approach |
| did not work because on platforms that use ptrace, the pc register |
| cannot be read unless the inferior is stopped. At that point, we |
| are not guaranteed the inferior is stopped and so the read_pc () |
| call can fail. Setting the prev_pc value here ensures the value is |
| updated correctly when the inferior is stopped. */ |
| prev_pc = read_pc (); |
| |
| /* Resume inferior. */ |
| resume (oneproc || step || bpstat_should_step (), stop_signal); |
| |
| /* Wait for it to stop (if not standalone) |
| and in any case decode why it stopped, and act accordingly. */ |
| /* Do this only if we are not using the event loop, or if the target |
| does not support asynchronous execution. */ |
| if (!target_can_async_p ()) |
| { |
| wait_for_inferior (); |
| normal_stop (); |
| } |
| } |
| |
| |
| /* Start remote-debugging of a machine over a serial link. */ |
| |
| void |
| start_remote (void) |
| { |
| init_thread_list (); |
| init_wait_for_inferior (); |
| stop_soon = STOP_QUIETLY; |
| trap_expected = 0; |
| |
| /* Always go on waiting for the target, regardless of the mode. */ |
| /* FIXME: cagney/1999-09-23: At present it isn't possible to |
| indicate to wait_for_inferior that a target should timeout if |
| nothing is returned (instead of just blocking). Because of this, |
| targets expecting an immediate response need to, internally, set |
| things up so that the target_wait() is forced to eventually |
| timeout. */ |
| /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
| differentiate to its caller what the state of the target is after |
| the initial open has been performed. Here we're assuming that |
| the target has stopped. It should be possible to eventually have |
| target_open() return to the caller an indication that the target |
| is currently running and GDB state should be set to the same as |
| for an async run. */ |
| wait_for_inferior (); |
| normal_stop (); |
| } |
| |
| /* Initialize static vars when a new inferior begins. */ |
| |
| void |
| init_wait_for_inferior (void) |
| { |
| /* These are meaningless until the first time through wait_for_inferior. */ |
| prev_pc = 0; |
| |
| breakpoints_inserted = 0; |
| breakpoint_init_inferior (inf_starting); |
| |
| /* Don't confuse first call to proceed(). */ |
| stop_signal = TARGET_SIGNAL_0; |
| |
| /* The first resume is not following a fork/vfork/exec. */ |
| pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ |
| |
| clear_proceed_status (); |
| |
| stepping_past_singlestep_breakpoint = 0; |
| } |
| |
| /* This enum encodes possible reasons for doing a target_wait, so that |
| wfi can call target_wait in one place. (Ultimately the call will be |
| moved out of the infinite loop entirely.) */ |
| |
| enum infwait_states |
| { |
| infwait_normal_state, |
| infwait_thread_hop_state, |
| infwait_nonstep_watch_state |
| }; |
| |
| /* Why did the inferior stop? Used to print the appropriate messages |
| to the interface from within handle_inferior_event(). */ |
| enum inferior_stop_reason |
| { |
| /* We don't know why. */ |
| STOP_UNKNOWN, |
| /* Step, next, nexti, stepi finished. */ |
| END_STEPPING_RANGE, |
| /* Found breakpoint. */ |
| BREAKPOINT_HIT, |
| /* Inferior terminated by signal. */ |
| SIGNAL_EXITED, |
| /* Inferior exited. */ |
| EXITED, |
| /* Inferior received signal, and user asked to be notified. */ |
| SIGNAL_RECEIVED |
| }; |
| |
| /* This structure contains what used to be local variables in |
| wait_for_inferior. Probably many of them can return to being |
| locals in handle_inferior_event. */ |
| |
| struct execution_control_state |
| { |
| struct target_waitstatus ws; |
| struct target_waitstatus *wp; |
| int another_trap; |
| int random_signal; |
| CORE_ADDR stop_func_start; |
| CORE_ADDR stop_func_end; |
| char *stop_func_name; |
| struct symtab_and_line sal; |
| int current_line; |
| struct symtab *current_symtab; |
| int handling_longjmp; /* FIXME */ |
| ptid_t ptid; |
| ptid_t saved_inferior_ptid; |
| int step_after_step_resume_breakpoint; |
| int stepping_through_solib_after_catch; |
| bpstat stepping_through_solib_catchpoints; |
| int new_thread_event; |
| struct target_waitstatus tmpstatus; |
| enum infwait_states infwait_state; |
| ptid_t waiton_ptid; |
| int wait_some_more; |
| }; |
| |
| void init_execution_control_state (struct execution_control_state *ecs); |
| |
| void handle_inferior_event (struct execution_control_state *ecs); |
| |
| static void step_into_function (struct execution_control_state *ecs); |
| static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
| static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
| struct frame_id sr_id); |
| static void stop_stepping (struct execution_control_state *ecs); |
| static void prepare_to_wait (struct execution_control_state *ecs); |
| static void keep_going (struct execution_control_state *ecs); |
| static void print_stop_reason (enum inferior_stop_reason stop_reason, |
| int stop_info); |
| |
| /* Wait for control to return from inferior to debugger. |
| If inferior gets a signal, we may decide to start it up again |
| instead of returning. That is why there is a loop in this function. |
| When this function actually returns it means the inferior |
| should be left stopped and GDB should read more commands. */ |
| |
| void |
| wait_for_inferior (void) |
| { |
| struct cleanup *old_cleanups; |
| struct execution_control_state ecss; |
| struct execution_control_state *ecs; |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n"); |
| |
| old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
| &step_resume_breakpoint); |
| |
| /* wfi still stays in a loop, so it's OK just to take the address of |
| a local to get the ecs pointer. */ |
| ecs = &ecss; |
| |
| /* Fill in with reasonable starting values. */ |
| init_execution_control_state (ecs); |
| |
| /* We'll update this if & when we switch to a new thread. */ |
| previous_inferior_ptid = inferior_ptid; |
| |
| overlay_cache_invalid = 1; |
| |
| /* We have to invalidate the registers BEFORE calling target_wait |
| because they can be loaded from the target while in target_wait. |
| This makes remote debugging a bit more efficient for those |
| targets that provide critical registers as part of their normal |
| status mechanism. */ |
| |
| registers_changed (); |
| |
| while (1) |
| { |
| if (deprecated_target_wait_hook) |
| ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); |
| else |
| ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
| |
| /* Now figure out what to do with the result of the result. */ |
| handle_inferior_event (ecs); |
| |
| if (!ecs->wait_some_more) |
| break; |
| } |
| do_cleanups (old_cleanups); |
| } |
| |
| /* Asynchronous version of wait_for_inferior. It is called by the |
| event loop whenever a change of state is detected on the file |
| descriptor corresponding to the target. It can be called more than |
| once to complete a single execution command. In such cases we need |
| to keep the state in a global variable ASYNC_ECSS. If it is the |
| last time that this function is called for a single execution |
| command, then report to the user that the inferior has stopped, and |
| do the necessary cleanups. */ |
| |
| struct execution_control_state async_ecss; |
| struct execution_control_state *async_ecs; |
| |
| void |
| fetch_inferior_event (void *client_data) |
| { |
| static struct cleanup *old_cleanups; |
| |
| async_ecs = &async_ecss; |
| |
| if (!async_ecs->wait_some_more) |
| { |
| old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
| &step_resume_breakpoint); |
| |
| /* Fill in with reasonable starting values. */ |
| init_execution_control_state (async_ecs); |
| |
| /* We'll update this if & when we switch to a new thread. */ |
| previous_inferior_ptid = inferior_ptid; |
| |
| overlay_cache_invalid = 1; |
| |
| /* We have to invalidate the registers BEFORE calling target_wait |
| because they can be loaded from the target while in target_wait. |
| This makes remote debugging a bit more efficient for those |
| targets that provide critical registers as part of their normal |
| status mechanism. */ |
| |
| registers_changed (); |
| } |
| |
| if (deprecated_target_wait_hook) |
| async_ecs->ptid = |
| deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
| else |
| async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
| |
| /* Now figure out what to do with the result of the result. */ |
| handle_inferior_event (async_ecs); |
| |
| if (!async_ecs->wait_some_more) |
| { |
| /* Do only the cleanups that have been added by this |
| function. Let the continuations for the commands do the rest, |
| if there are any. */ |
| do_exec_cleanups (old_cleanups); |
| normal_stop (); |
| if (step_multi && stop_step) |
| inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
| else |
| inferior_event_handler (INF_EXEC_COMPLETE, NULL); |
| } |
| } |
| |
| /* Prepare an execution control state for looping through a |
| wait_for_inferior-type loop. */ |
| |
| void |
| init_execution_control_state (struct execution_control_state *ecs) |
| { |
| /* ecs->another_trap? */ |
| ecs->random_signal = 0; |
| ecs->step_after_step_resume_breakpoint = 0; |
| ecs->handling_longjmp = 0; /* FIXME */ |
| ecs->stepping_through_solib_after_catch = 0; |
| ecs->stepping_through_solib_catchpoints = NULL; |
| ecs->sal = find_pc_line (prev_pc, 0); |
| ecs->current_line = ecs->sal.line; |
| ecs->current_symtab = ecs->sal.symtab; |
| ecs->infwait_state = infwait_normal_state; |
| ecs->waiton_ptid = pid_to_ptid (-1); |
| ecs->wp = &(ecs->ws); |
| } |
| |
| /* Return the cached copy of the last pid/waitstatus returned by |
| target_wait()/deprecated_target_wait_hook(). The data is actually |
| cached by handle_inferior_event(), which gets called immediately |
| after target_wait()/deprecated_target_wait_hook(). */ |
| |
| void |
| get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
| { |
| *ptidp = target_last_wait_ptid; |
| *status = target_last_waitstatus; |
| } |
| |
| /* Switch thread contexts, maintaining "infrun state". */ |
| |
| static void |
| context_switch (struct execution_control_state *ecs) |
| { |
| /* Caution: it may happen that the new thread (or the old one!) |
| is not in the thread list. In this case we must not attempt |
| to "switch context", or we run the risk that our context may |
| be lost. This may happen as a result of the target module |
| mishandling thread creation. */ |
| |
| if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) |
| { /* Perform infrun state context switch: */ |
| /* Save infrun state for the old thread. */ |
| save_infrun_state (inferior_ptid, prev_pc, |
| trap_expected, step_resume_breakpoint, |
| step_range_start, |
| step_range_end, &step_frame_id, |
| ecs->handling_longjmp, ecs->another_trap, |
| ecs->stepping_through_solib_after_catch, |
| ecs->stepping_through_solib_catchpoints, |
| ecs->current_line, ecs->current_symtab); |
| |
| /* Load infrun state for the new thread. */ |
| load_infrun_state (ecs->ptid, &prev_pc, |
| &trap_expected, &step_resume_breakpoint, |
| &step_range_start, |
| &step_range_end, &step_frame_id, |
| &ecs->handling_longjmp, &ecs->another_trap, |
| &ecs->stepping_through_solib_after_catch, |
| &ecs->stepping_through_solib_catchpoints, |
| &ecs->current_line, &ecs->current_symtab); |
| } |
| inferior_ptid = ecs->ptid; |
| } |
| |
| static void |
| adjust_pc_after_break (struct execution_control_state *ecs) |
| { |
| CORE_ADDR breakpoint_pc; |
| |
| /* If this target does not decrement the PC after breakpoints, then |
| we have nothing to do. */ |
| if (DECR_PC_AFTER_BREAK == 0) |
| return; |
| |
| /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
| we aren't, just return. |
| |
| We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not |
| affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented |
| by software breakpoints should be handled through the normal breakpoint |
| layer. |
| |
| NOTE drow/2004-01-31: On some targets, breakpoints may generate |
| different signals (SIGILL or SIGEMT for instance), but it is less |
| clear where the PC is pointing afterwards. It may not match |
| DECR_PC_AFTER_BREAK. I don't know any specific target that generates |
| these signals at breakpoints (the code has been in GDB since at least |
| 1992) so I can not guess how to handle them here. |
| |
| In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS |
| would have the PC after hitting a watchpoint affected by |
| DECR_PC_AFTER_BREAK. I haven't found any target with both of these set |
| in GDB history, and it seems unlikely to be correct, so |
| HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ |
| |
| if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) |
| return; |
| |
| if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) |
| return; |
| |
| /* Find the location where (if we've hit a breakpoint) the |
| breakpoint would be. */ |
| breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; |
| |
| if (SOFTWARE_SINGLE_STEP_P ()) |
| { |
| /* When using software single-step, a SIGTRAP can only indicate |
| an inserted breakpoint. This actually makes things |
| easier. */ |
| if (singlestep_breakpoints_inserted_p) |
| /* When software single stepping, the instruction at [prev_pc] |
| is never a breakpoint, but the instruction following |
| [prev_pc] (in program execution order) always is. Assume |
| that following instruction was reached and hence a software |
| breakpoint was hit. */ |
| write_pc_pid (breakpoint_pc, ecs->ptid); |
| else if (software_breakpoint_inserted_here_p (breakpoint_pc)) |
| /* The inferior was free running (i.e., no single-step |
| breakpoints inserted) and it hit a software breakpoint. */ |
| write_pc_pid (breakpoint_pc, ecs->ptid); |
| } |
| else |
| { |
| /* When using hardware single-step, a SIGTRAP is reported for |
| both a completed single-step and a software breakpoint. Need |
| to differentiate between the two as the latter needs |
| adjusting but the former does not. */ |
| if (currently_stepping (ecs)) |
| { |
| if (prev_pc == breakpoint_pc |
| && software_breakpoint_inserted_here_p (breakpoint_pc)) |
| /* Hardware single-stepped a software breakpoint (as |
| occures when the inferior is resumed with PC pointing |
| at not-yet-hit software breakpoint). Since the |
| breakpoint really is executed, the inferior needs to be |
| backed up to the breakpoint address. */ |
| write_pc_pid (breakpoint_pc, ecs->ptid); |
| } |
| else |
| { |
| if (software_breakpoint_inserted_here_p (breakpoint_pc)) |
| /* The inferior was free running (i.e., no hardware |
| single-step and no possibility of a false SIGTRAP) and |
| hit a software breakpoint. */ |
| write_pc_pid (breakpoint_pc, ecs->ptid); |
| } |
| } |
| } |
| |
| /* Given an execution control state that has been freshly filled in |
| by an event from the inferior, figure out what it means and take |
| appropriate action. */ |
| |
| int stepped_after_stopped_by_watchpoint; |
| |
| void |
| handle_inferior_event (struct execution_control_state *ecs) |
| { |
| /* NOTE: cagney/2003-03-28: If you're looking at this code and |
| thinking that the variable stepped_after_stopped_by_watchpoint |
| isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT, |
| defined in the file "config/pa/nm-hppah.h", accesses the variable |
| indirectly. Mutter something rude about the HP merge. */ |
| int sw_single_step_trap_p = 0; |
| int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
| |
| /* Cache the last pid/waitstatus. */ |
| target_last_wait_ptid = ecs->ptid; |
| target_last_waitstatus = *ecs->wp; |
| |
| adjust_pc_after_break (ecs); |
| |
| switch (ecs->infwait_state) |
| { |
| case infwait_thread_hop_state: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
| /* Cancel the waiton_ptid. */ |
| ecs->waiton_ptid = pid_to_ptid (-1); |
| break; |
| |
| case infwait_normal_state: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
| stepped_after_stopped_by_watchpoint = 0; |
| break; |
| |
| case infwait_nonstep_watch_state: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, |
| "infrun: infwait_nonstep_watch_state\n"); |
| insert_breakpoints (); |
| |
| /* FIXME-maybe: is this cleaner than setting a flag? Does it |
| handle things like signals arriving and other things happening |
| in combination correctly? */ |
| stepped_after_stopped_by_watchpoint = 1; |
| break; |
| |
| default: |
| internal_error (__FILE__, __LINE__, "bad switch"); |
| } |
| ecs->infwait_state = infwait_normal_state; |
| |
| flush_cached_frames (); |
| |
| /* If it's a new process, add it to the thread database */ |
| |
| ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
| && !ptid_equal (ecs->ptid, minus_one_ptid) |
| && !in_thread_list (ecs->ptid)); |
| |
| if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
| && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) |
| { |
| add_thread (ecs->ptid); |
| |
| ui_out_text (uiout, "[New "); |
| ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); |
| ui_out_text (uiout, "]\n"); |
| } |
| |
| switch (ecs->ws.kind) |
| { |
| case TARGET_WAITKIND_LOADED: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
| /* Ignore gracefully during startup of the inferior, as it |
| might be the shell which has just loaded some objects, |
| otherwise add the symbols for the newly loaded objects. */ |
| #ifdef SOLIB_ADD |
| if (stop_soon == NO_STOP_QUIETLY) |
| { |
| /* Remove breakpoints, SOLIB_ADD might adjust |
| breakpoint addresses via breakpoint_re_set. */ |
| if (breakpoints_inserted) |
| remove_breakpoints (); |
| |
| /* Check for any newly added shared libraries if we're |
| supposed to be adding them automatically. Switch |
| terminal for any messages produced by |
| breakpoint_re_set. */ |
| target_terminal_ours_for_output (); |
| /* NOTE: cagney/2003-11-25: Make certain that the target |
| stack's section table is kept up-to-date. Architectures, |
| (e.g., PPC64), use the section table to perform |
| operations such as address => section name and hence |
| require the table to contain all sections (including |
| those found in shared libraries). */ |
| /* NOTE: cagney/2003-11-25: Pass current_target and not |
| exec_ops to SOLIB_ADD. This is because current GDB is |
| only tooled to propagate section_table changes out from |
| the "current_target" (see target_resize_to_sections), and |
| not up from the exec stratum. This, of course, isn't |
| right. "infrun.c" should only interact with the |
| exec/process stratum, instead relying on the target stack |
| to propagate relevant changes (stop, section table |
| changed, ...) up to other layers. */ |
| SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
| target_terminal_inferior (); |
| |
| /* Reinsert breakpoints and continue. */ |
| if (breakpoints_inserted) |
| insert_breakpoints (); |
| } |
| #endif |
| resume (0, TARGET_SIGNAL_0); |
| prepare_to_wait (ecs); |
| return; |
| |
| case TARGET_WAITKIND_SPURIOUS: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
| resume (0, TARGET_SIGNAL_0); |
| prepare_to_wait (ecs); |
| return; |
| |
| case TARGET_WAITKIND_EXITED: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
| target_terminal_ours (); /* Must do this before mourn anyway */ |
| print_stop_reason (EXITED, ecs->ws.value.integer); |
| |
| /* Record the exit code in the convenience variable $_exitcode, so |
| that the user can inspect this again later. */ |
| set_internalvar (lookup_internalvar ("_exitcode"), |
| value_from_longest (builtin_type_int, |
| (LONGEST) ecs->ws.value.integer)); |
| gdb_flush (gdb_stdout); |
| target_mourn_inferior (); |
| singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ |
| stop_print_frame = 0; |
| stop_stepping (ecs); |
| return; |
| |
| case TARGET_WAITKIND_SIGNALLED: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
| stop_print_frame = 0; |
| stop_signal = ecs->ws.value.sig; |
| target_terminal_ours (); /* Must do this before mourn anyway */ |
| |
| /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
| reach here unless the inferior is dead. However, for years |
| target_kill() was called here, which hints that fatal signals aren't |
| really fatal on some systems. If that's true, then some changes |
| may be needed. */ |
| target_mourn_inferior (); |
| |
| print_stop_reason (SIGNAL_EXITED, stop_signal); |
| singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ |
| stop_stepping (ecs); |
| return; |
| |
| /* The following are the only cases in which we keep going; |
| the above cases end in a continue or goto. */ |
| case TARGET_WAITKIND_FORKED: |
| case TARGET_WAITKIND_VFORKED: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
| stop_signal = TARGET_SIGNAL_TRAP; |
| pending_follow.kind = ecs->ws.kind; |
| |
| pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
| pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; |
| |
| stop_pc = read_pc (); |
| |
| stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
| |
| ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
| |
| /* If no catchpoint triggered for this, then keep going. */ |
| if (ecs->random_signal) |
| { |
| stop_signal = TARGET_SIGNAL_0; |
| keep_going (ecs); |
| return; |
| } |
| goto process_event_stop_test; |
| |
| case TARGET_WAITKIND_EXECD: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECED\n"); |
| stop_signal = TARGET_SIGNAL_TRAP; |
| |
| /* NOTE drow/2002-12-05: This code should be pushed down into the |
| target_wait function. Until then following vfork on HP/UX 10.20 |
| is probably broken by this. Of course, it's broken anyway. */ |
| /* Is this a target which reports multiple exec events per actual |
| call to exec()? (HP-UX using ptrace does, for example.) If so, |
| ignore all but the last one. Just resume the exec'r, and wait |
| for the next exec event. */ |
| if (inferior_ignoring_leading_exec_events) |
| { |
| inferior_ignoring_leading_exec_events--; |
| if (pending_follow.kind == TARGET_WAITKIND_VFORKED) |
| ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. |
| parent_pid); |
| target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); |
| prepare_to_wait (ecs); |
| return; |
| } |
| inferior_ignoring_leading_exec_events = |
| target_reported_exec_events_per_exec_call () - 1; |
| |
| pending_follow.execd_pathname = |
| savestring (ecs->ws.value.execd_pathname, |
| strlen (ecs->ws.value.execd_pathname)); |
| |
| /* This causes the eventpoints and symbol table to be reset. Must |
| do this now, before trying to determine whether to stop. */ |
| follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); |
| xfree (pending_follow.execd_pathname); |
| |
| stop_pc = read_pc_pid (ecs->ptid); |
| ecs->saved_inferior_ptid = inferior_ptid; |
| inferior_ptid = ecs->ptid; |
| |
| stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
| |
| ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
| inferior_ptid = ecs->saved_inferior_ptid; |
| |
| /* If no catchpoint triggered for this, then keep going. */ |
| if (ecs->random_signal) |
| { |
| stop_signal = TARGET_SIGNAL_0; |
| keep_going (ecs); |
| return; |
| } |
| goto process_event_stop_test; |
| |
| /* Be careful not to try to gather much state about a thread |
| that's in a syscall. It's frequently a losing proposition. */ |
| case TARGET_WAITKIND_SYSCALL_ENTRY: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
| resume (0, TARGET_SIGNAL_0); |
| prepare_to_wait (ecs); |
| return; |
| |
| /* Before examining the threads further, step this thread to |
| get it entirely out of the syscall. (We get notice of the |
| event when the thread is just on the verge of exiting a |
| syscall. Stepping one instruction seems to get it back |
| into user code.) */ |
| case TARGET_WAITKIND_SYSCALL_RETURN: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
| target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
| prepare_to_wait (ecs); |
| return; |
| |
| case TARGET_WAITKIND_STOPPED: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
| stop_signal = ecs->ws.value.sig; |
| break; |
| |
| /* We had an event in the inferior, but we are not interested |
| in handling it at this level. The lower layers have already |
| done what needs to be done, if anything. |
| |
| One of the possible circumstances for this is when the |
| inferior produces output for the console. The inferior has |
| not stopped, and we are ignoring the event. Another possible |
| circumstance is any event which the lower level knows will be |
| reported multiple times without an intervening resume. */ |
| case TARGET_WAITKIND_IGNORE: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
| prepare_to_wait (ecs); |
| return; |
| } |
| |
| /* We may want to consider not doing a resume here in order to give |
| the user a chance to play with the new thread. It might be good |
| to make that a user-settable option. */ |
| |
| /* At this point, all threads are stopped (happens automatically in |
| either the OS or the native code). Therefore we need to continue |
| all threads in order to make progress. */ |
| if (ecs->new_thread_event) |
| { |
| target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
| prepare_to_wait (ecs); |
| return; |
| } |
| |
| stop_pc = read_pc_pid (ecs->ptid); |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); |
| |
| if (stepping_past_singlestep_breakpoint) |
| { |
| gdb_assert (SOFTWARE_SINGLE_STEP_P () |
| && singlestep_breakpoints_inserted_p); |
| gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
| gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); |
| |
| stepping_past_singlestep_breakpoint = 0; |
| |
| /* We've either finished single-stepping past the single-step |
| breakpoint, or stopped for some other reason. It would be nice if |
| we could tell, but we can't reliably. */ |
| if (stop_signal == TARGET_SIGNAL_TRAP) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
| /* Pull the single step breakpoints out of the target. */ |
| SOFTWARE_SINGLE_STEP (0, 0); |
| singlestep_breakpoints_inserted_p = 0; |
| |
| ecs->random_signal = 0; |
| |
| ecs->ptid = saved_singlestep_ptid; |
| context_switch (ecs); |
| if (deprecated_context_hook) |
| deprecated_context_hook (pid_to_thread_id (ecs->ptid)); |
| |
| resume (1, TARGET_SIGNAL_0); |
| prepare_to_wait (ecs); |
| return; |
| } |
| } |
| |
| stepping_past_singlestep_breakpoint = 0; |
| |
| /* See if a thread hit a thread-specific breakpoint that was meant for |
| another thread. If so, then step that thread past the breakpoint, |
| and continue it. */ |
| |
| if (stop_signal == TARGET_SIGNAL_TRAP) |
| { |
| int thread_hop_needed = 0; |
| |
| /* Check if a regular breakpoint has been hit before checking |
| for a potential single step breakpoint. Otherwise, GDB will |
| not see this breakpoint hit when stepping onto breakpoints. */ |
| if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
| { |
| ecs->random_signal = 0; |
| if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
| thread_hop_needed = 1; |
| } |
| else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
| { |
| ecs->random_signal = 0; |
| /* The call to in_thread_list is necessary because PTIDs sometimes |
| change when we go from single-threaded to multi-threaded. If |
| the singlestep_ptid is still in the list, assume that it is |
| really different from ecs->ptid. */ |
| if (!ptid_equal (singlestep_ptid, ecs->ptid) |
| && in_thread_list (singlestep_ptid)) |
| { |
| thread_hop_needed = 1; |
| stepping_past_singlestep_breakpoint = 1; |
| saved_singlestep_ptid = singlestep_ptid; |
| } |
| } |
| |
| if (thread_hop_needed) |
| { |
| int remove_status; |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
| |
| /* Saw a breakpoint, but it was hit by the wrong thread. |
| Just continue. */ |
| |
| if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
| { |
| /* Pull the single step breakpoints out of the target. */ |
| SOFTWARE_SINGLE_STEP (0, 0); |
| singlestep_breakpoints_inserted_p = 0; |
| } |
| |
| remove_status = remove_breakpoints (); |
| /* Did we fail to remove breakpoints? If so, try |
| to set the PC past the bp. (There's at least |
| one situation in which we can fail to remove |
| the bp's: On HP-UX's that use ttrace, we can't |
| change the address space of a vforking child |
| process until the child exits (well, okay, not |
| then either :-) or execs. */ |
| if (remove_status != 0) |
| { |
| /* FIXME! This is obviously non-portable! */ |
| write_pc_pid (stop_pc + 4, ecs->ptid); |
| /* We need to restart all the threads now, |
| * unles we're running in scheduler-locked mode. |
| * Use currently_stepping to determine whether to |
| * step or continue. |
| */ |
| /* FIXME MVS: is there any reason not to call resume()? */ |
| if (scheduler_mode == schedlock_on) |
| target_resume (ecs->ptid, |
| currently_stepping (ecs), TARGET_SIGNAL_0); |
| else |
| target_resume (RESUME_ALL, |
| currently_stepping (ecs), TARGET_SIGNAL_0); |
| prepare_to_wait (ecs); |
| return; |
| } |
| else |
| { /* Single step */ |
| breakpoints_inserted = 0; |
| if (!ptid_equal (inferior_ptid, ecs->ptid)) |
| context_switch (ecs); |
| ecs->waiton_ptid = ecs->ptid; |
| ecs->wp = &(ecs->ws); |
| ecs->another_trap = 1; |
| |
| ecs->infwait_state = infwait_thread_hop_state; |
| keep_going (ecs); |
| registers_changed (); |
| return; |
| } |
| } |
| else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
| { |
| sw_single_step_trap_p = 1; |
| ecs->random_signal = 0; |
| } |
| } |
| else |
| ecs->random_signal = 1; |
| |
| /* See if something interesting happened to the non-current thread. If |
| so, then switch to that thread. */ |
| if (!ptid_equal (ecs->ptid, inferior_ptid)) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
| |
| context_switch (ecs); |
| |
| if (deprecated_context_hook) |
| deprecated_context_hook (pid_to_thread_id (ecs->ptid)); |
| |
| flush_cached_frames (); |
| } |
| |
| if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
| { |
| /* Pull the single step breakpoints out of the target. */ |
| SOFTWARE_SINGLE_STEP (0, 0); |
| singlestep_breakpoints_inserted_p = 0; |
| } |
| |
| /* It may not be necessary to disable the watchpoint to stop over |
| it. For example, the PA can (with some kernel cooperation) |
| single step over a watchpoint without disabling the watchpoint. */ |
| if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
| resume (1, 0); |
| prepare_to_wait (ecs); |
| return; |
| } |
| |
| /* It is far more common to need to disable a watchpoint to step |
| the inferior over it. FIXME. What else might a debug |
| register or page protection watchpoint scheme need here? */ |
| if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) |
| { |
| /* At this point, we are stopped at an instruction which has |
| attempted to write to a piece of memory under control of |
| a watchpoint. The instruction hasn't actually executed |
| yet. If we were to evaluate the watchpoint expression |
| now, we would get the old value, and therefore no change |
| would seem to have occurred. |
| |
| In order to make watchpoints work `right', we really need |
| to complete the memory write, and then evaluate the |
| watchpoint expression. The following code does that by |
| removing the watchpoint (actually, all watchpoints and |
| breakpoints), single-stepping the target, re-inserting |
| watchpoints, and then falling through to let normal |
| single-step processing handle proceed. Since this |
| includes evaluating watchpoints, things will come to a |
| stop in the correct manner. */ |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
| remove_breakpoints (); |
| registers_changed (); |
| target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ |
| |
| ecs->waiton_ptid = ecs->ptid; |
| ecs->wp = &(ecs->ws); |
| ecs->infwait_state = infwait_nonstep_watch_state; |
| prepare_to_wait (ecs); |
| return; |
| } |
| |
| /* It may be possible to simply continue after a watchpoint. */ |
| if (HAVE_CONTINUABLE_WATCHPOINT) |
| stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
| |
| ecs->stop_func_start = 0; |
| ecs->stop_func_end = 0; |
| ecs->stop_func_name = 0; |
| /* Don't care about return value; stop_func_start and stop_func_name |
| will both be 0 if it doesn't work. */ |
| find_pc_partial_function (stop_pc, &ecs->stop_func_name, |
| &ecs->stop_func_start, &ecs->stop_func_end); |
| ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET; |
| ecs->another_trap = 0; |
| bpstat_clear (&stop_bpstat); |
| stop_step = 0; |
| stop_stack_dummy = 0; |
| stop_print_frame = 1; |
| ecs->random_signal = 0; |
| stopped_by_random_signal = 0; |
| breakpoints_failed = 0; |
| |
| if (stop_signal == TARGET_SIGNAL_TRAP |
| && trap_expected |
| && gdbarch_single_step_through_delay_p (current_gdbarch) |
| && currently_stepping (ecs)) |
| { |
| /* We're trying to step of a breakpoint. Turns out that we're |
| also on an instruction that needs to be stepped multiple |
| times before it's been fully executing. E.g., architectures |
| with a delay slot. It needs to be stepped twice, once for |
| the instruction and once for the delay slot. */ |
| int step_through_delay |
| = gdbarch_single_step_through_delay (current_gdbarch, |
| get_current_frame ()); |
| if (debug_infrun && step_through_delay) |
| fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
| if (step_range_end == 0 && step_through_delay) |
| { |
| /* The user issued a continue when stopped at a breakpoint. |
| Set up for another trap and get out of here. */ |
| ecs->another_trap = 1; |
| keep_going (ecs); |
| return; |
| } |
| else if (step_through_delay) |
| { |
| /* The user issued a step when stopped at a breakpoint. |
| Maybe we should stop, maybe we should not - the delay |
| slot *might* correspond to a line of source. In any |
| case, don't decide that here, just set ecs->another_trap, |
| making sure we single-step again before breakpoints are |
| re-inserted. */ |
| ecs->another_trap = 1; |
| } |
| } |
| |
| /* Look at the cause of the stop, and decide what to do. |
| The alternatives are: |
| 1) break; to really stop and return to the debugger, |
| 2) drop through to start up again |
| (set ecs->another_trap to 1 to single step once) |
| 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
| will be made according to the signal handling tables. */ |
| |
| /* First, distinguish signals caused by the debugger from signals |
| that have to do with the program's own actions. Note that |
| breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending |
| on the operating system version. Here we detect when a SIGILL or |
| SIGEMT is really a breakpoint and change it to SIGTRAP. We do |
| something similar for SIGSEGV, since a SIGSEGV will be generated |
| when we're trying to execute a breakpoint instruction on a |
| non-executable stack. This happens for call dummy breakpoints |
| for architectures like SPARC that place call dummies on the |
| stack. */ |
| |
| if (stop_signal == TARGET_SIGNAL_TRAP |
| || (breakpoints_inserted |
| && (stop_signal == TARGET_SIGNAL_ILL |
| || stop_signal == TARGET_SIGNAL_SEGV |
| || stop_signal == TARGET_SIGNAL_EMT)) |
| || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
| { |
| if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
| stop_print_frame = 0; |
| stop_stepping (ecs); |
| return; |
| } |
| |
| /* This is originated from start_remote(), start_inferior() and |
| shared libraries hook functions. */ |
| if (stop_soon == STOP_QUIETLY) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
| stop_stepping (ecs); |
| return; |
| } |
| |
| /* This originates from attach_command(). We need to overwrite |
| the stop_signal here, because some kernels don't ignore a |
| SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. |
| See more comments in inferior.h. */ |
| if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
| { |
| stop_stepping (ecs); |
| if (stop_signal == TARGET_SIGNAL_STOP) |
| stop_signal = TARGET_SIGNAL_0; |
| return; |
| } |
| |
| /* Don't even think about breakpoints if just proceeded over a |
| breakpoint. */ |
| if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n"); |
| bpstat_clear (&stop_bpstat); |
| } |
| else |
| { |
| /* See if there is a breakpoint at the current PC. */ |
| stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
| stopped_by_watchpoint); |
| |
| /* Following in case break condition called a |
| function. */ |
| stop_print_frame = 1; |
| } |
| |
| /* NOTE: cagney/2003-03-29: These two checks for a random signal |
| at one stage in the past included checks for an inferior |
| function call's call dummy's return breakpoint. The original |
| comment, that went with the test, read: |
| |
| ``End of a stack dummy. Some systems (e.g. Sony news) give |
| another signal besides SIGTRAP, so check here as well as |
| above.'' |
| |
| If someone ever tries to get get call dummys on a |
| non-executable stack to work (where the target would stop |
| with something like a SIGSEGV), then those tests might need |
| to be re-instated. Given, however, that the tests were only |
| enabled when momentary breakpoints were not being used, I |
| suspect that it won't be the case. |
| |
| NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
| be necessary for call dummies on a non-executable stack on |
| SPARC. */ |
| |
| if (stop_signal == TARGET_SIGNAL_TRAP) |
| ecs->random_signal |
| = !(bpstat_explains_signal (stop_bpstat) |
| || trap_expected |
| || (step_range_end && step_resume_breakpoint == NULL)); |
| else |
| { |
| ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
| if (!ecs->random_signal) |
| stop_signal = TARGET_SIGNAL_TRAP; |
| } |
| } |
| |
| /* When we reach this point, we've pretty much decided |
| that the reason for stopping must've been a random |
| (unexpected) signal. */ |
| |
| else |
| ecs->random_signal = 1; |
| |
| process_event_stop_test: |
| /* For the program's own signals, act according to |
| the signal handling tables. */ |
| |
| if (ecs->random_signal) |
| { |
| /* Signal not for debugging purposes. */ |
| int printed = 0; |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal); |
| |
| stopped_by_random_signal = 1; |
| |
| if (signal_print[stop_signal]) |
| { |
| printed = 1; |
| target_terminal_ours_for_output (); |
| print_stop_reason (SIGNAL_RECEIVED, stop_signal); |
| } |
| if (signal_stop[stop_signal]) |
| { |
| stop_stepping (ecs); |
| return; |
| } |
| /* If not going to stop, give terminal back |
| if we took it away. */ |
| else if (printed) |
| target_terminal_inferior (); |
| |
| /* Clear the signal if it should not be passed. */ |
| if (signal_program[stop_signal] == 0) |
| stop_signal = TARGET_SIGNAL_0; |
| |
| if (prev_pc == read_pc () |
| && !breakpoints_inserted |
| && breakpoint_here_p (read_pc ()) |
| && step_resume_breakpoint == NULL) |
| { |
| /* We were just starting a new sequence, attempting to |
| single-step off of a breakpoint and expecting a SIGTRAP. |
| Intead this signal arrives. This signal will take us out |
| of the stepping range so GDB needs to remember to, when |
| the signal handler returns, resume stepping off that |
| breakpoint. */ |
| /* To simplify things, "continue" is forced to use the same |
| code paths as single-step - set a breakpoint at the |
| signal return address and then, once hit, step off that |
| breakpoint. */ |
| insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
| ecs->step_after_step_resume_breakpoint = 1; |
| keep_going (ecs); |
| return; |
| } |
| |
| if (step_range_end != 0 |
| && stop_signal != TARGET_SIGNAL_0 |
| && stop_pc >= step_range_start && stop_pc < step_range_end |
| && frame_id_eq (get_frame_id (get_current_frame ()), |
| step_frame_id) |
| && step_resume_breakpoint == NULL) |
| { |
| /* The inferior is about to take a signal that will take it |
| out of the single step range. Set a breakpoint at the |
| current PC (which is presumably where the signal handler |
| will eventually return) and then allow the inferior to |
| run free. |
| |
| Note that this is only needed for a signal delivered |
| while in the single-step range. Nested signals aren't a |
| problem as they eventually all return. */ |
| insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
| keep_going (ecs); |
| return; |
| } |
| |
| /* Note: step_resume_breakpoint may be non-NULL. This occures |
| when either there's a nested signal, or when there's a |
| pending signal enabled just as the signal handler returns |
| (leaving the inferior at the step-resume-breakpoint without |
| actually executing it). Either way continue until the |
| breakpoint is really hit. */ |
| keep_going (ecs); |
| return; |
| } |
| |
| /* Handle cases caused by hitting a breakpoint. */ |
| { |
| CORE_ADDR jmp_buf_pc; |
| struct bpstat_what what; |
| |
| what = bpstat_what (stop_bpstat); |
| |
| if (what.call_dummy) |
| { |
| stop_stack_dummy = 1; |
| } |
| |
| switch (what.main_action) |
| { |
| case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
| /* If we hit the breakpoint at longjmp, disable it for the |
| duration of this command. Then, install a temporary |
| breakpoint at the target of the jmp_buf. */ |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_SET_LONGJMP_RESUME\n"); |
| disable_longjmp_breakpoint (); |
| remove_breakpoints (); |
| breakpoints_inserted = 0; |
| if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) |
| { |
| keep_going (ecs); |
| return; |
| } |
| |
| /* Need to blow away step-resume breakpoint, as it |
| interferes with us */ |
| if (step_resume_breakpoint != NULL) |
| { |
| delete_step_resume_breakpoint (&step_resume_breakpoint); |
| } |
| |
| set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
| ecs->handling_longjmp = 1; /* FIXME */ |
| keep_going (ecs); |
| return; |
| |
| case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
| case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_CLEAR_LONGJMP_RESUME\n"); |
| remove_breakpoints (); |
| breakpoints_inserted = 0; |
| disable_longjmp_breakpoint (); |
| ecs->handling_longjmp = 0; /* FIXME */ |
| if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) |
| break; |
| /* else fallthrough */ |
| |
| case BPSTAT_WHAT_SINGLE: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_SINGLE\n"); |
| if (breakpoints_inserted) |
| { |
| remove_breakpoints (); |
| } |
| breakpoints_inserted = 0; |
| ecs->another_trap = 1; |
| /* Still need to check other stuff, at least the case |
| where we are stepping and step out of the right range. */ |
| break; |
| |
| case BPSTAT_WHAT_STOP_NOISY: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_STOP_NOISY\n"); |
| stop_print_frame = 1; |
| |
| /* We are about to nuke the step_resume_breakpointt via the |
| cleanup chain, so no need to worry about it here. */ |
| |
| stop_stepping (ecs); |
| return; |
| |
| case BPSTAT_WHAT_STOP_SILENT: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_STOP_SILENT\n"); |
| stop_print_frame = 0; |
| |
| /* We are about to nuke the step_resume_breakpoin via the |
| cleanup chain, so no need to worry about it here. */ |
| |
| stop_stepping (ecs); |
| return; |
| |
| case BPSTAT_WHAT_STEP_RESUME: |
| /* This proably demands a more elegant solution, but, yeah |
| right... |
| |
| This function's use of the simple variable |
| step_resume_breakpoint doesn't seem to accomodate |
| simultaneously active step-resume bp's, although the |
| breakpoint list certainly can. |
| |
| If we reach here and step_resume_breakpoint is already |
| NULL, then apparently we have multiple active |
| step-resume bp's. We'll just delete the breakpoint we |
| stopped at, and carry on. |
| |
| Correction: what the code currently does is delete a |
| step-resume bp, but it makes no effort to ensure that |
| the one deleted is the one currently stopped at. MVS */ |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_STEP_RESUME\n"); |
| |
| if (step_resume_breakpoint == NULL) |
| { |
| step_resume_breakpoint = |
| bpstat_find_step_resume_breakpoint (stop_bpstat); |
| } |
| delete_step_resume_breakpoint (&step_resume_breakpoint); |
| if (ecs->step_after_step_resume_breakpoint) |
| { |
| /* Back when the step-resume breakpoint was inserted, we |
| were trying to single-step off a breakpoint. Go back |
| to doing that. */ |
| ecs->step_after_step_resume_breakpoint = 0; |
| remove_breakpoints (); |
| breakpoints_inserted = 0; |
| ecs->another_trap = 1; |
| keep_going (ecs); |
| return; |
| } |
| break; |
| |
| case BPSTAT_WHAT_THROUGH_SIGTRAMP: |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_THROUGH_SIGTRAMP\n"); |
| /* If were waiting for a trap, hitting the step_resume_break |
| doesn't count as getting it. */ |
| if (trap_expected) |
| ecs->another_trap = 1; |
| break; |
| |
| case BPSTAT_WHAT_CHECK_SHLIBS: |
| case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: |
| #ifdef SOLIB_ADD |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: BPSTATE_WHAT_CHECK_SHLIBS\n"); |
| /* Remove breakpoints, we eventually want to step over the |
| shlib event breakpoint, and SOLIB_ADD might adjust |
| breakpoint addresses via breakpoint_re_set. */ |
| if (breakpoints_inserted) |
| remove_breakpoints (); |
| breakpoints_inserted = 0; |
| |
| /* Check for any newly added shared libraries if we're |
| supposed to be adding them automatically. Switch |
| terminal for any messages produced by |
| breakpoint_re_set. */ |
| target_terminal_ours_for_output (); |
| /* NOTE: cagney/2003-11-25: Make certain that the target |
| stack's section table is kept up-to-date. Architectures, |
| (e.g., PPC64), use the section table to perform |
| operations such as address => section name and hence |
| require the table to contain all sections (including |
| those found in shared libraries). */ |
| /* NOTE: cagney/2003-11-25: Pass current_target and not |
| exec_ops to SOLIB_ADD. This is because current GDB is |
| only tooled to propagate section_table changes out from |
| the "current_target" (see target_resize_to_sections), and |
| not up from the exec stratum. This, of course, isn't |
| right. "infrun.c" should only interact with the |
| exec/process stratum, instead relying on the target stack |
| to propagate relevant changes (stop, section table |
| changed, ...) up to other layers. */ |
| SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
| target_terminal_inferior (); |
| |
| /* Try to reenable shared library breakpoints, additional |
| code segments in shared libraries might be mapped in now. */ |
| re_enable_breakpoints_in_shlibs (); |
| |
| /* If requested, stop when the dynamic linker notifies |
| gdb of events. This allows the user to get control |
| and place breakpoints in initializer routines for |
| dynamically loaded objects (among other things). */ |
| if (stop_on_solib_events || stop_stack_dummy) |
| { |
| stop_stepping (ecs); |
| return; |
| } |
| |
| /* If we stopped due to an explicit catchpoint, then the |
| (see above) call to SOLIB_ADD pulled in any symbols |
| from a newly-loaded library, if appropriate. |
| |
| We do want the inferior to stop, but not where it is |
| now, which is in the dynamic linker callback. Rather, |
| we would like it stop in the user's program, just after |
| the call that caused this catchpoint to trigger. That |
| gives the user a more useful vantage from which to |
| examine their program's state. */ |
| else if (what.main_action |
| == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) |
| { |
| /* ??rehrauer: If I could figure out how to get the |
| right return PC from here, we could just set a temp |
| breakpoint and resume. I'm not sure we can without |
| cracking open the dld's shared libraries and sniffing |
| their unwind tables and text/data ranges, and that's |
| not a terribly portable notion. |
| |
| Until that time, we must step the inferior out of the |
| dld callback, and also out of the dld itself (and any |
| code or stubs in libdld.sl, such as "shl_load" and |
| friends) until we reach non-dld code. At that point, |
| we can stop stepping. */ |
| bpstat_get_triggered_catchpoints (stop_bpstat, |
| &ecs-> |
| stepping_through_solib_catchpoints); |
| ecs->stepping_through_solib_after_catch = 1; |
| |
| /* Be sure to lift all breakpoints, so the inferior does |
| actually step past this point... */ |
| ecs->another_trap = 1; |
| break; |
| } |
| else |
| { |
| /* We want to step over this breakpoint, then keep going. */ |
| ecs->another_trap = 1; |
| break; |
| } |
| } |
| #endif |
| break; |
| |
| case BPSTAT_WHAT_LAST: |
| /* Not a real code, but listed here to shut up gcc -Wall. */ |
| |
| case BPSTAT_WHAT_KEEP_CHECKING: |
| break; |
| } |
| } |
| |
| /* We come here if we hit a breakpoint but should not |
| stop for it. Possibly we also were stepping |
| and should stop for that. So fall through and |
| test for stepping. But, if not stepping, |
| do not stop. */ |
| |
| /* Are we stepping to get the inferior out of the dynamic linker's |
| hook (and possibly the dld itself) after catching a shlib |
| event? */ |
| if (ecs->stepping_through_solib_after_catch) |
| { |
| #if defined(SOLIB_ADD) |
| /* Have we reached our destination? If not, keep going. */ |
| if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
| ecs->another_trap = 1; |
| keep_going (ecs); |
| return; |
| } |
| #endif |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
| /* Else, stop and report the catchpoint(s) whose triggering |
| caused us to begin stepping. */ |
| ecs->stepping_through_solib_after_catch = 0; |
| bpstat_clear (&stop_bpstat); |
| stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); |
| bpstat_clear (&ecs->stepping_through_solib_catchpoints); |
| stop_print_frame = 1; |
| stop_stepping (ecs); |
| return; |
| } |
| |
| if (step_resume_breakpoint) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: step-resume breakpoint\n"); |
| |
| /* Having a step-resume breakpoint overrides anything |
| else having to do with stepping commands until |
| that breakpoint is reached. */ |
| keep_going (ecs); |
| return; |
| } |
| |
| if (step_range_end == 0) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
| /* Likewise if we aren't even stepping. */ |
| keep_going (ecs); |
| return; |
| } |
| |
| /* If stepping through a line, keep going if still within it. |
| |
| Note that step_range_end is the address of the first instruction |
| beyond the step range, and NOT the address of the last instruction |
| within it! */ |
| if (stop_pc >= step_range_start && stop_pc < step_range_end) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
| paddr_nz (step_range_start), |
| paddr_nz (step_range_end)); |
| keep_going (ecs); |
| return; |
| } |
| |
| /* We stepped out of the stepping range. */ |
| |
| /* If we are stepping at the source level and entered the runtime |
| loader dynamic symbol resolution code, we keep on single stepping |
| until we exit the run time loader code and reach the callee's |
| address. */ |
| if (step_over_calls == STEP_OVER_UNDEBUGGABLE |
| && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) |
| { |
| CORE_ADDR pc_after_resolver = |
| gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
| |
| if (pc_after_resolver) |
| { |
| /* Set up a step-resume breakpoint at the address |
| indicated by SKIP_SOLIB_RESOLVER. */ |
| struct symtab_and_line sr_sal; |
| init_sal (&sr_sal); |
| sr_sal.pc = pc_after_resolver; |
| |
| insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
| } |
| |
| keep_going (ecs); |
| return; |
| } |
| |
| if (step_range_end != 1 |
| && (step_over_calls == STEP_OVER_UNDEBUGGABLE |
| || step_over_calls == STEP_OVER_ALL) |
| && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
| /* The inferior, while doing a "step" or "next", has ended up in |
| a signal trampoline (either by a signal being delivered or by |
| the signal handler returning). Just single-step until the |
| inferior leaves the trampoline (either by calling the handler |
| or returning). */ |
| keep_going (ecs); |
| return; |
| } |
| |
| if (frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) |
| { |
| /* It's a subroutine call. */ |
| CORE_ADDR real_stop_pc; |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
| |
| if ((step_over_calls == STEP_OVER_NONE) |
| || ((step_range_end == 1) |
| && in_prologue (prev_pc, ecs->stop_func_start))) |
| { |
| /* I presume that step_over_calls is only 0 when we're |
| supposed to be stepping at the assembly language level |
| ("stepi"). Just stop. */ |
| /* Also, maybe we just did a "nexti" inside a prolog, so we |
| thought it was a subroutine call but it was not. Stop as |
| well. FENN */ |
| stop_step = 1; |
| print_stop_reason (END_STEPPING_RANGE, 0); |
| stop_stepping (ecs); |
| return; |
| } |
| |
| if (step_over_calls == STEP_OVER_ALL) |
| { |
| /* We're doing a "next", set a breakpoint at callee's return |
| address (the address at which the caller will |
| resume). */ |
| insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
| keep_going (ecs); |
| return; |
| } |
| |
| /* If we are in a function call trampoline (a stub between the |
| calling routine and the real function), locate the real |
| function. That's what tells us (a) whether we want to step |
| into it at all, and (b) what prologue we want to run to the |
| end of, if we do step into it. */ |
| real_stop_pc = skip_language_trampoline (stop_pc); |
| if (real_stop_pc == 0) |
| real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
| if (real_stop_pc != 0) |
| ecs->stop_func_start = real_stop_pc; |
| |
| if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)) |
| { |
| struct symtab_and_line sr_sal; |
| init_sal (&sr_sal); |
| sr_sal.pc = ecs->stop_func_start; |
| |
| insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
| keep_going (ecs); |
| return; |
| } |
| |
| /* If we have line number information for the function we are |
| thinking of stepping into, step into it. |
| |
| If there are several symtabs at that PC (e.g. with include |
| files), just want to know whether *any* of them have line |
| numbers. find_pc_line handles this. */ |
| { |
| struct symtab_and_line tmp_sal; |
| |
| tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
| if (tmp_sal.line != 0) |
| { |
| step_into_function (ecs); |
| return; |
| } |
| } |
| |
| /* If we have no line number and the step-stop-if-no-debug is |
| set, we stop the step so that the user has a chance to switch |
| in assembly mode. */ |
| if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
| { |
| stop_step = 1; |
| print_stop_reason (END_STEPPING_RANGE, 0); |
| stop_stepping (ecs); |
| return; |
| } |
| |
| /* Set a breakpoint at callee's return address (the address at |
| which the caller will resume). */ |
| insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
| keep_going (ecs); |
| return; |
| } |
| |
| /* If we're in the return path from a shared library trampoline, |
| we want to proceed through the trampoline when stepping. */ |
| if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) |
| { |
| /* Determine where this trampoline returns. */ |
| CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
| |
| /* Only proceed through if we know where it's going. */ |
| if (real_stop_pc) |
| { |
| /* And put the step-breakpoint there and go until there. */ |
| struct symtab_and_line sr_sal; |
| |
| init_sal (&sr_sal); /* initialize to zeroes */ |
| sr_sal.pc = real_stop_pc; |
| sr_sal.section = find_pc_overlay (sr_sal.pc); |
| |
| /* Do not specify what the fp should be when we stop since |
| on some machines the prologue is where the new fp value |
| is established. */ |
| insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
| |
| /* Restart without fiddling with the step ranges or |
| other state. */ |
| keep_going (ecs); |
| return; |
| } |
| } |
| |
| /* NOTE: tausq/2004-05-24: This if block used to be done before all |
| the trampoline processing logic, however, there are some trampolines |
| that have no names, so we should do trampoline handling first. */ |
| if (step_over_calls == STEP_OVER_UNDEBUGGABLE |
| && ecs->stop_func_name == NULL) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
| |
| /* The inferior just stepped into, or returned to, an |
| undebuggable function (where there is no symbol, not even a |
| minimal symbol, corresponding to the address where the |
| inferior stopped). Since we want to skip this kind of code, |
| we keep going until the inferior returns from this |
| function. */ |
| if (step_stop_if_no_debug) |
| { |
| /* If we have no line number and the step-stop-if-no-debug |
| is set, we stop the step so that the user has a chance to |
| switch in assembly mode. */ |
| stop_step = 1; |
| print_stop_reason (END_STEPPING_RANGE, 0); |
| stop_stepping (ecs); |
| return; |
| } |
| else |
| { |
| /* Set a breakpoint at callee's return address (the address |
| at which the caller will resume). */ |
| insert_step_resume_breakpoint_at_frame (get_prev_frame (get_current_frame ())); |
| keep_going (ecs); |
| return; |
| } |
| } |
| |
| if (step_range_end == 1) |
| { |
| /* It is stepi or nexti. We always want to stop stepping after |
| one instruction. */ |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
| stop_step = 1; |
| print_stop_reason (END_STEPPING_RANGE, 0); |
| stop_stepping (ecs); |
| return; |
| } |
| |
| ecs->sal = find_pc_line (stop_pc, 0); |
| |
| if (ecs->sal.line == 0) |
| { |
| /* We have no line number information. That means to stop |
| stepping (does this always happen right after one instruction, |
| when we do "s" in a function with no line numbers, |
| or can this happen as a result of a return or longjmp?). */ |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
| stop_step = 1; |
| print_stop_reason (END_STEPPING_RANGE, 0); |
| stop_stepping (ecs); |
| return; |
| } |
| |
| if ((stop_pc == ecs->sal.pc) |
| && (ecs->current_line != ecs->sal.line |
| || ecs->current_symtab != ecs->sal.symtab)) |
| { |
| /* We are at the start of a different line. So stop. Note that |
| we don't stop if we step into the middle of a different line. |
| That is said to make things like for (;;) statements work |
| better. */ |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
| stop_step = 1; |
| print_stop_reason (END_STEPPING_RANGE, 0); |
| stop_stepping (ecs); |
| return; |
| } |
| |
| /* We aren't done stepping. |
| |
| Optimize by setting the stepping range to the line. |
| (We might not be in the original line, but if we entered a |
| new line in mid-statement, we continue stepping. This makes |
| things like for(;;) statements work better.) */ |
| |
| if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
| { |
| /* If this is the last line of the function, don't keep stepping |
| (it would probably step us out of the function). |
| This is particularly necessary for a one-line function, |
| in which after skipping the prologue we better stop even though |
| we will be in mid-line. */ |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n"); |
| stop_step = 1; |
| print_stop_reason (END_STEPPING_RANGE, 0); |
| stop_stepping (ecs); |
| return; |
| } |
| step_range_start = ecs->sal.pc; |
| step_range_end = ecs->sal.end; |
| step_frame_id = get_frame_id (get_current_frame ()); |
| ecs->current_line = ecs->sal.line; |
| ecs->current_symtab = ecs->sal.symtab; |
| |
| /* In the case where we just stepped out of a function into the |
| middle of a line of the caller, continue stepping, but |
| step_frame_id must be modified to current frame */ |
| #if 0 |
| /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too |
| generous. It will trigger on things like a step into a frameless |
| stackless leaf function. I think the logic should instead look |
| at the unwound frame ID has that should give a more robust |
| indication of what happened. */ |
| if (step - ID == current - ID) |
| still stepping in same function; |
| else if (step - ID == unwind (current - ID)) |
| stepped into a function; |
| else |
| stepped out of a function; |
| /* Of course this assumes that the frame ID unwind code is robust |
| and we're willing to introduce frame unwind logic into this |
| function. Fortunately, those days are nearly upon us. */ |
| #endif |
| { |
| struct frame_id current_frame = get_frame_id (get_current_frame ()); |
| if (!(frame_id_inner (current_frame, step_frame_id))) |
| step_frame_id = current_frame; |
| } |
| |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
| keep_going (ecs); |
| } |
| |
| /* Are we in the middle of stepping? */ |
| |
| static int |
| currently_stepping (struct execution_control_state *ecs) |
| { |
| return ((!ecs->handling_longjmp |
| && ((step_range_end && step_resume_breakpoint == NULL) |
| || trap_expected)) |
| || ecs->stepping_through_solib_after_catch |
| || bpstat_should_step ()); |
| } |
| |
| /* Subroutine call with source code we should not step over. Do step |
| to the first line of code in it. */ |
| |
| static void |
| step_into_function (struct execution_control_state *ecs) |
| { |
| struct symtab *s; |
| struct symtab_and_line sr_sal; |
| |
| s = find_pc_symtab (stop_pc); |
| if (s && s->language != language_asm) |
| ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); |
| |
| ecs->sal = find_pc_line (ecs->stop_func_start, 0); |
| /* Use the step_resume_break to step until the end of the prologue, |
| even if that involves jumps (as it seems to on the vax under |
| 4.2). */ |
| /* If the prologue ends in the middle of a source line, continue to |
| the end of that source line (if it is still within the function). |
| Otherwise, just go to end of prologue. */ |
| if (ecs->sal.end |
| && ecs->sal.pc != ecs->stop_func_start |
| && ecs->sal.end < ecs->stop_func_end) |
| ecs->stop_func_start = ecs->sal.end; |
| |
| /* Architectures which require breakpoint adjustment might not be able |
| to place a breakpoint at the computed address. If so, the test |
| ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust |
| ecs->stop_func_start to an address at which a breakpoint may be |
| legitimately placed. |
| |
| Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
| made, GDB will enter an infinite loop when stepping through |
| optimized code consisting of VLIW instructions which contain |
| subinstructions corresponding to different source lines. On |
| FR-V, it's not permitted to place a breakpoint on any but the |
| first subinstruction of a VLIW instruction. When a breakpoint is |
| set, GDB will adjust the breakpoint address to the beginning of |
| the VLIW instruction. Thus, we need to make the corresponding |
| adjustment here when computing the stop address. */ |
| |
| if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
| { |
| ecs->stop_func_start |
| = gdbarch_adjust_breakpoint_address (current_gdbarch, |
| ecs->stop_func_start); |
| } |
| |
| if (ecs->stop_func_start == stop_pc) |
| { |
| /* We are already there: stop now. */ |
| stop_step = 1; |
| print_stop_reason (END_STEPPING_RANGE, 0); |
| stop_stepping (ecs); |
| return; |
| } |
| else |
| { |
| /* Put the step-breakpoint there and go until there. */ |
| init_sal (&sr_sal); /* initialize to zeroes */ |
| sr_sal.pc = ecs->stop_func_start; |
| sr_sal.section = find_pc_overlay (ecs->stop_func_start); |
| |
| /* Do not specify what the fp should be when we stop since on |
| some machines the prologue is where the new fp value is |
| established. */ |
| insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
| |
| /* And make sure stepping stops right away then. */ |
| step_range_end = step_range_start; |
| } |
| keep_going (ecs); |
| } |
| |
| /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID. |
| This is used to both functions and to skip over code. */ |
| |
| static void |
| insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
| struct frame_id sr_id) |
| { |
| /* There should never be more than one step-resume breakpoint per |
| thread, so we should never be setting a new |
| step_resume_breakpoint when one is already active. */ |
| gdb_assert (step_resume_breakpoint == NULL); |
| step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, |
| bp_step_resume); |
| if (breakpoints_inserted) |
| insert_breakpoints (); |
| } |
| |
| /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used |
| to skip a function (next, skip-no-debug) or signal. It's assumed |
| that the function/signal handler being skipped eventually returns |
| to the breakpoint inserted at RETURN_FRAME.pc. |
| |
| For the skip-function case, the function may have been reached by |
| either single stepping a call / return / signal-return instruction, |
| or by hitting a breakpoint. In all cases, the RETURN_FRAME belongs |
| to the skip-function's caller. |
| |
| For the signals case, this is called with the interrupted |
| function's frame. The signal handler, when it returns, will resume |
| the interrupted function at RETURN_FRAME.pc. */ |
| |
| static void |
| insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
| { |
| struct symtab_and_line sr_sal; |
| |
| init_sal (&sr_sal); /* initialize to zeros */ |
| |
| sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame)); |
| sr_sal.section = find_pc_overlay (sr_sal.pc); |
| |
| insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
| } |
| |
| static void |
| stop_stepping (struct execution_control_state *ecs) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
| |
| /* Let callers know we don't want to wait for the inferior anymore. */ |
| ecs->wait_some_more = 0; |
| } |
| |
| /* This function handles various cases where we need to continue |
| waiting for the inferior. */ |
| /* (Used to be the keep_going: label in the old wait_for_inferior) */ |
| |
| static void |
| keep_going (struct execution_control_state *ecs) |
| { |
| /* Save the pc before execution, to compare with pc after stop. */ |
| prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
| |
| /* If we did not do break;, it means we should keep running the |
| inferior and not return to debugger. */ |
| |
| if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) |
| { |
| /* We took a signal (which we are supposed to pass through to |
| the inferior, else we'd have done a break above) and we |
| haven't yet gotten our trap. Simply continue. */ |
| resume (currently_stepping (ecs), stop_signal); |
| } |
| else |
| { |
| /* Either the trap was not expected, but we are continuing |
| anyway (the user asked that this signal be passed to the |
| child) |
| -- or -- |
| The signal was SIGTRAP, e.g. it was our signal, but we |
| decided we should resume from it. |
| |
| We're going to run this baby now! */ |
| |
| if (!breakpoints_inserted && !ecs->another_trap) |
| { |
| breakpoints_failed = insert_breakpoints (); |
| if (breakpoints_failed) |
| { |
| stop_stepping (ecs); |
| return; |
| } |
| breakpoints_inserted = 1; |
| } |
| |
| trap_expected = ecs->another_trap; |
| |
| /* Do not deliver SIGNAL_TRAP (except when the user explicitly |
| specifies that such a signal should be delivered to the |
| target program). |
| |
| Typically, this would occure when a user is debugging a |
| target monitor on a simulator: the target monitor sets a |
| breakpoint; the simulator encounters this break-point and |
| halts the simulation handing control to GDB; GDB, noteing |
| that the break-point isn't valid, returns control back to the |
| simulator; the simulator then delivers the hardware |
| equivalent of a SIGNAL_TRAP to the program being debugged. */ |
| |
| if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) |
| stop_signal = TARGET_SIGNAL_0; |
| |
| |
| resume (currently_stepping (ecs), stop_signal); |
| } |
| |
| prepare_to_wait (ecs); |
| } |
| |
| /* This function normally comes after a resume, before |
| handle_inferior_event exits. It takes care of any last bits of |
| housekeeping, and sets the all-important wait_some_more flag. */ |
| |
| static void |
| prepare_to_wait (struct execution_control_state *ecs) |
| { |
| if (debug_infrun) |
| fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
| if (ecs->infwait_state == infwait_normal_state) |
| { |
| overlay_cache_invalid = 1; |
| |
| /* We have to invalidate the registers BEFORE calling |
| target_wait because they can be loaded from the target while |
| in target_wait. This makes remote debugging a bit more |
| efficient for those targets that provide critical registers |
| as part of their normal status mechanism. */ |
| |
| registers_changed (); |
| ecs->waiton_ptid = pid_to_ptid (-1); |
| ecs->wp = &(ecs->ws); |
| } |
| /* This is the old end of the while loop. Let everybody know we |
| want to wait for the inferior some more and get called again |
| soon. */ |
| ecs->wait_some_more = 1; |
| } |
| |
| /* Print why the inferior has stopped. We always print something when |
| the inferior exits, or receives a signal. The rest of the cases are |
| dealt with later on in normal_stop() and print_it_typical(). Ideally |
| there should be a call to this function from handle_inferior_event() |
| each time stop_stepping() is called.*/ |
| static void |
| print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) |
| { |
| switch (stop_reason) |
| { |
| case STOP_UNKNOWN: |
| /* We don't deal with these cases from handle_inferior_event() |
| yet. */ |
| break; |
| case END_STEPPING_RANGE: |
| /* We are done with a step/next/si/ni command. */ |
| /* For now print nothing. */ |
| /* Print a message only if not in the middle of doing a "step n" |
| operation for n > 1 */ |
| if (!step_multi || !stop_step) |
| if (ui_out_is_mi_like_p (uiout)) |
| ui_out_field_string (uiout, "reason", "end-stepping-range"); |
| break; |
| case BREAKPOINT_HIT: |
| /* We found a breakpoint. */ |
| /* For now print nothing. */ |
| break; |
| case SIGNAL_EXITED: |
| /* The inferior was terminated by a signal. */ |
| annotate_signalled (); |
| if (ui_out_is_mi_like_p (uiout)) |
| ui_out_field_string (uiout, "reason", "exited-signalled"); |
| ui_out_text (uiout, "\nProgram terminated with signal "); |
| annotate_signal_name (); |
| ui_out_field_string (uiout, "signal-name", |
| target_signal_to_name (stop_info)); |
| annotate_signal_name_end (); |
| ui_out_text (uiout, ", "); |
| annotate_signal_string (); |
| ui_out_field_string (uiout, "signal-meaning", |
| target_signal_to_string (stop_info)); |
| annotate_signal_string_end (); |
| ui_out_text (uiout, ".\n"); |
| ui_out_text (uiout, "The program no longer exists.\n"); |
| break; |
| case EXITED: |
| /* The inferior program is finished. */ |
| annotate_exited (stop_info); |
| if (stop_info) |
| { |
| if (ui_out_is_mi_like_p (uiout)) |
| ui_out_field_string (uiout, "reason", "exited"); |
| ui_out_text (uiout, "\nProgram exited with code "); |
| ui_out_field_fmt (uiout, "exit-code", "0%o", |
| (unsigned int) stop_info); |
| ui_out_text (uiout, ".\n"); |
| } |
| else |
| { |
| if (ui_out_is_mi_like_p (uiout)) |
| ui_out_field_string (uiout, "reason", "exited-normally"); |
| ui_out_text (uiout, "\nProgram exited normally.\n"); |
| } |
| break; |
| case SIGNAL_RECEIVED: |
| /* Signal received. The signal table tells us to print about |
| it. */ |
| annotate_signal (); |
| ui_out_text (uiout, "\nProgram received signal "); |
| annotate_signal_name (); |
| if (ui_out_is_mi_like_p (uiout)) |
| ui_out_field_string (uiout, "reason", "signal-received"); |
| ui_out_field_string (uiout, "signal-name", |
| target_signal_to_name (stop_info)); |
| annotate_signal_name_end (); |
| ui_out_text (uiout, ", "); |
| annotate_signal_string (); |
| ui_out_field_string (uiout, "signal-meaning", |
| target_signal_to_string (stop_info)); |
| annotate_signal_string_end (); |
| ui_out_text (uiout, ".\n"); |
| break; |
| default: |
| internal_error (__FILE__, __LINE__, |
| "print_stop_reason: unrecognized enum value"); |
| break; |
| } |
| } |
| |
| |
| /* Here to return control to GDB when the inferior stops for real. |
| Print appropriate messages, remove breakpoints, give terminal our modes. |
| |
| STOP_PRINT_FRAME nonzero means print the executing frame |
| (pc, function, args, file, line number and line text). |
| BREAKPOINTS_FAILED nonzero means stop was due to error |
| attempting to insert breakpoints. */ |
| |
| void |
| normal_stop (void) |
| { |
| struct target_waitstatus last; |
| ptid_t last_ptid; |
| |
| get_last_target_status (&last_ptid, &last); |
| |
| /* As with the notification of thread events, we want to delay |
| notifying the user that we've switched thread context until |
| the inferior actually stops. |
| |
| There's no point in saying anything if the inferior has exited. |
| Note that SIGNALLED here means "exited with a signal", not |
| "received a signal". */ |
| if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
| && target_has_execution |
| && last.kind != TARGET_WAITKIND_SIGNALLED |
| && last.kind != TARGET_WAITKIND_EXITED) |
| { |
| target_terminal_ours_for_output (); |
| printf_filtered ("[Switching to %s]\n", |
| target_pid_or_tid_to_str (inferior_ptid)); |
| previous_inferior_ptid = inferior_ptid; |
| } |
| |
| /* NOTE drow/2004-01-17: Is this still necessary? */ |
| /* Make sure that the current_frame's pc is correct. This |
| is a correction for setting up the frame info before doing |
| DECR_PC_AFTER_BREAK */ |
| if (target_has_execution) |
| /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to |
| DECR_PC_AFTER_BREAK, the program counter can change. Ask the |
| frame code to check for this and sort out any resultant mess. |
| DECR_PC_AFTER_BREAK needs to just go away. */ |
| deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
| |
| if (target_has_execution && breakpoints_inserted) |
| { |
| if (remove_breakpoints ()) |
| { |
| target_terminal_ours_for_output (); |
| printf_filtered ("Cannot remove breakpoints because "); |
| printf_filtered ("program is no longer writable.\n"); |
| printf_filtered ("It might be running in another process.\n"); |
| printf_filtered ("Further execution is probably impossible.\n"); |
| } |
| } |
| breakpoints_inserted = 0; |
| |
| /* Delete the breakpoint we stopped at, if it wants to be deleted. |
| Delete any breakpoint that is to be deleted at the next stop. */ |
| |
| breakpoint_auto_delete (stop_bpstat); |
| |
| /* If an auto-display called a function and that got a signal, |
| delete that auto-display to avoid an infinite recursion. */ |
| |
| if (stopped_by_random_signal) |
| disable_current_display (); |
| |
| /* Don't print a message if in the middle of doing a "step n" |
| operation for n > 1 */ |
| if (step_multi && stop_step) |
| goto done; |
| |
| target_terminal_ours (); |
| |
| /* Look up the hook_stop and run it (CLI internally handles problem |
| of stop_command's pre-hook not existing). */ |
| if (stop_command) |
| catch_errors (hook_stop_stub, stop_command, |
| "Error while running hook_stop:\n", RETURN_MASK_ALL); |
| |
| if (!target_has_stack) |
| { |
| |
| goto done; |
| } |
| |
| /* Select innermost stack frame - i.e., current frame is frame 0, |
| and current location is based on that. |
| Don't do this on return from a stack dummy routine, |
| or if the program has exited. */ |
| |
| if (!stop_stack_dummy) |
| { |
| select_frame (get_current_frame ()); |
| |
| /* Print current location without a level number, if |
| we have changed functions or hit a breakpoint. |
| Print source line if we have one. |
| bpstat_print() contains the logic deciding in detail |
| what to print, based on the event(s) that just occurred. */ |
| |
| if (stop_print_frame && deprecated_selected_frame) |
| { |
| int bpstat_ret; |
| int source_flag; |
| int do_frame_printing = 1; |
| |
| bpstat_ret = bpstat_print (stop_bpstat); |
| switch (bpstat_ret) |
| { |
| case PRINT_UNKNOWN: |
| /* FIXME: cagney/2002-12-01: Given that a frame ID does |
| (or should) carry around the function and does (or |
| should) use that when doing a frame comparison. */ |
| if (stop_step |
| && frame_id_eq (step_frame_id, |
| get_frame_id (get_current_frame ())) |
| && step_start_function == find_pc_function (stop_pc)) |
| source_flag = SRC_LINE; /* finished step, just print source line */ |
| else |
| source_flag = SRC_AND_LOC; /* print location and source line */ |
| break; |
| case PRINT_SRC_AND_LOC: |
| source_flag = SRC_AND_LOC; /* print location and source line */ |
| break; |
| case PRINT_SRC_ONLY: |
| source_flag = SRC_LINE; |
| break; |
| case PRINT_NOTHING: |
| source_flag = SRC_LINE; /* something bogus */ |
| do_frame_printing = 0; |
| break; |
| default: |
| internal_error (__FILE__, __LINE__, "Unknown value."); |
| } |
| /* For mi, have the same behavior every time we stop: |
| print everything but the source line. */ |
| if (ui_out_is_mi_like_p (uiout)) |
| source_flag = LOC_AND_ADDRESS; |
| |
| if (ui_out_is_mi_like_p (uiout)) |
| ui_out_field_int (uiout, "thread-id", |
| pid_to_thread_id (inferior_ptid)); |
| /* The behavior of this routine with respect to the source |
| flag is: |
| SRC_LINE: Print only source line |
| LOCATION: Print only location |
| SRC_AND_LOC: Print location and source line */ |
| if (do_frame_printing) |
| print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
| |
| /* Display the auto-display expressions. */ |
| do_displays (); |
| } |
| } |
| |
| /* Save the function value return registers, if we care. |
| We might be about to restore their previous contents. */ |
| if (proceed_to_finish) |
| /* NB: The copy goes through to the target picking up the value of |
| all the registers. */ |
| regcache_cpy (stop_registers, current_regcache); |
| |
| if (stop_stack_dummy) |
| { |
| /* Pop the empty frame that contains the stack dummy. POP_FRAME |
| ends with a setting of the current frame, so we can use that |
| next. */ |
| frame_pop (get_current_frame ()); |
| /* Set stop_pc to what it was before we called the function. |
| Can't rely on restore_inferior_status because that only gets |
| called if we don't stop in the called function. */ |
| stop_pc = read_pc (); |
| select_frame (get_current_frame ()); |
| } |
| |
| done: |
| annotate_stopped (); |
| observer_notify_normal_stop (stop_bpstat); |
| } |
| |
| static int |
| hook_stop_stub (void *cmd) |
| { |
| execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
| return (0); |
| } |
| |
| int |
| signal_stop_state (int signo) |
| { |
| return signal_stop[signo]; |
| } |
| |
| int |
| signal_print_state (int signo) |
| { |
| return signal_print[signo]; |
| } |
| |
| int |
| signal_pass_state (int signo) |
| { |
| return signal_program[signo]; |
| } |
| |
| int |
| signal_stop_update (int signo, int state) |
| { |
| int ret = signal_stop[signo]; |
| signal_stop[signo] = state; |
| return ret; |
| } |
| |
| int |
| signal_print_update (int signo, int state) |
| { |
| int ret = signal_print[signo]; |
| signal_print[signo] = state; |
| return ret; |
| } |
| |
| int |
| signal_pass_update (int signo, int state) |
| { |
| int ret = signal_program[signo]; |
| signal_program[signo] = state; |
| return ret; |
| } |
| |
| static void |
| sig_print_header (void) |
| { |
| printf_filtered ("\ |
| Signal Stop\tPrint\tPass to program\tDescription\n"); |
| } |
| |
| static void |
| sig_print_info (enum target_signal oursig) |
| { |
| char *name = target_signal_to_name (oursig); |
| int name_padding = 13 - strlen (name); |
| |
| if (name_padding <= 0) |
| name_padding = 0; |
| |
| printf_filtered ("%s", name); |
| printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
| printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
| printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); |
| printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); |
| printf_filtered ("%s\n", target_signal_to_string (oursig)); |
| } |
| |
| /* Specify how various signals in the inferior should be handled. */ |
| |
| static void |
| handle_command (char *args, int from_tty) |
| { |
| char **argv; |
| int digits, wordlen; |
| int sigfirst, signum, siglast; |
| enum target_signal oursig; |
| int allsigs; |
| int nsigs; |
| unsigned char *sigs; |
| struct cleanup *old_chain; |
| |
| if (args == NULL) |
| { |
| error_no_arg ("signal to handle"); |
| } |
| |
| /* Allocate and zero an array of flags for which signals to handle. */ |
| |
| nsigs = (int) TARGET_SIGNAL_LAST; |
| sigs = (unsigned char *) alloca (nsigs); |
| memset (sigs, 0, nsigs); |
| |
| /* Break the command line up into args. */ |
| |
| argv = buildargv (args); |
| if (argv == NULL) |
| { |
| nomem (0); |
| } |
| old_chain = make_cleanup_freeargv (argv); |
| |
| /* Walk through the args, looking for signal oursigs, signal names, and |
| actions. Signal numbers and signal names may be interspersed with |
| actions, with the actions being performed for all signals cumulatively |
| specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
| |
| while (*argv != NULL) |
| { |
| wordlen = strlen (*argv); |
| for (digits = 0; isdigit ((*argv)[digits]); digits++) |
| {; |
| } |
| allsigs = 0; |
| sigfirst = siglast = -1; |
| |
| if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) |
| { |
| /* Apply action to all signals except those used by the |
| debugger. Silently skip those. */ |
| allsigs = 1; |
| sigfirst = 0; |
| siglast = nsigs - 1; |
| } |
| else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) |
| { |
| SET_SIGS (nsigs, sigs, signal_stop); |
| SET_SIGS (nsigs, sigs, signal_print); |
| } |
| else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) |
| { |
| UNSET_SIGS (nsigs, sigs, signal_program); |
| } |
| else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) |
| { |
| SET_SIGS (nsigs, sigs, signal_print); |
| } |
| else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) |
| { |
| SET_SIGS (nsigs, sigs, signal_program); |
| } |
| else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) |
| { |
| UNSET_SIGS (nsigs, sigs, signal_stop); |
| } |
| else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) |
| { |
| SET_SIGS (nsigs, sigs, signal_program); |
| } |
| else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) |
| { |
| UNSET_SIGS (nsigs, sigs, signal_print); |
| UNSET_SIGS (nsigs, sigs, signal_stop); |
| } |
| else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) |
| { |
| UNSET_SIGS (nsigs, sigs, signal_program); |
| } |
| else if (digits > 0) |
| { |
| /* It is numeric. The numeric signal refers to our own |
| internal signal numbering from target.h, not to host/target |
| signal number. This is a feature; users really should be |
| using symbolic names anyway, and the common ones like |
| SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ |
| |
| sigfirst = siglast = (int) |
| target_signal_from_command (atoi (*argv)); |
| if ((*argv)[digits] == '-') |
| { |
| siglast = (int) |
| target_signal_from_command (atoi ((*argv) + digits + 1)); |
| } |
| if (sigfirst > siglast) |
| { |
| /* Bet he didn't figure we'd think of this case... */ |
| signum = sigfirst; |
| sigfirst = siglast; |
| siglast = signum; |
| } |
| } |
| else |
| { |
| oursig = target_signal_from_name (*argv); |
| if (oursig != TARGET_SIGNAL_UNKNOWN) |
| { |
| sigfirst = siglast = (int) oursig; |
| } |
| else |
| { |
| /* Not a number and not a recognized flag word => complain. */ |
| error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); |
| } |
| } |
| |
| /* If any signal numbers or symbol names were found, set flags for |
| which signals to apply actions to. */ |
| |
| for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
| { |
| switch ((enum target_signal) signum) |
| { |
| case TARGET_SIGNAL_TRAP: |
| case TARGET_SIGNAL_INT: |
| if (!allsigs && !sigs[signum]) |
| { |
| if (query ("%s is used by the debugger.\n\ |
| Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
| { |
| sigs[signum] = 1; |
| } |
| else |
| { |
| printf_unfiltered ("Not confirmed, unchanged.\n"); |
| gdb_flush (gdb_stdout); |
| } |
| } |
| break; |
| case TARGET_SIGNAL_0: |
| case TARGET_SIGNAL_DEFAULT: |
| case TARGET_SIGNAL_UNKNOWN: |
| /* Make sure that "all" doesn't print these. */ |
| break; |
| default: |
| sigs[signum] = 1; |
| break; |
| } |
| } |
| |
| argv++; |
| } |
| |
| target_notice_signals (inferior_ptid); |
| |
| if (from_tty) |
| { |
| /* Show the results. */ |
| sig_print_header (); |
| for (signum = 0; signum < nsigs; signum++) |
| { |
| if (sigs[signum]) |
| { |
| sig_print_info (signum); |
| } |
| } |
| } |
| |
| do_cleanups (old_chain); |
| } |
| |
| static void |
| xdb_handle_command (char *args, int from_tty) |
| { |
| char **argv; |
| struct cleanup *old_chain; |
| |
| /* Break the command line up into args. */ |
| |
| argv = buildargv (args); |
| if (argv == NULL) |
| { |
| nomem (0); |
| } |
| old_chain = make_cleanup_freeargv (argv); |
| if (argv[1] != (char *) NULL) |
| { |
| char *argBuf; |
| int bufLen; |
| |
| bufLen = strlen (argv[0]) + 20; |
| argBuf = (char *) xmalloc (bufLen); |
| if (argBuf) |
| { |
| int validFlag = 1; |
| enum target_signal oursig; |
| |
| oursig = target_signal_from_name (argv[0]); |
| memset (argBuf, 0, bufLen); |
| if (strcmp (argv[1], "Q") == 0) |
| sprintf (argBuf, "%s %s", argv[0], "noprint"); |
| else |
| { |
| if (strcmp (argv[1], "s") == 0) |
| { |
| if (!signal_stop[oursig]) |
| sprintf (argBuf, "%s %s", argv[0], "stop"); |
| else |
| sprintf (argBuf, "%s %s", argv[0], "nostop"); |
| } |
| else if (strcmp (argv[1], "i") == 0) |
| { |
| if (!signal_program[oursig]) |
| sprintf (argBuf, "%s %s", argv[0], "pass"); |
| else |
| sprintf (argBuf, "%s %s", argv[0], "nopass"); |
| } |
| else if (strcmp (argv[1], "r") == 0) |
| { |
| if (!signal_print[oursig]) |
| sprintf (argBuf, "%s %s", argv[0], "print"); |
| else |
| sprintf (argBuf, "%s %s", argv[0], "noprint"); |
| } |
| else |
| validFlag = 0; |
| } |
| if (validFlag) |
| handle_command (argBuf, from_tty); |
| else |
| printf_filtered ("Invalid signal handling flag.\n"); |
| if (argBuf) |
| xfree (argBuf); |
| } |
| } |
| do_cleanups (old_chain); |
| } |
| |
| /* Print current contents of the tables set by the handle command. |
| It is possible we should just be printing signals actually used |
| by the current target (but for things to work right when switching |
| targets, all signals should be in the signal tables). */ |
| |
| static void |
| signals_info (char *signum_exp, int from_tty) |
| { |
| enum target_signal oursig; |
| sig_print_header (); |
| |
| if (signum_exp) |
| { |
| /* First see if this is a symbol name. */ |
| oursig = target_signal_from_name (signum_exp); |
| if (oursig == TARGET_SIGNAL_UNKNOWN) |
| { |
| /* No, try numeric. */ |
| oursig = |
| target_signal_from_command (parse_and_eval_long (signum_exp)); |
| } |
| sig_print_info (oursig); |
| return; |
| } |
| |
| printf_filtered ("\n"); |
| /* These ugly casts brought to you by the native VAX compiler. */ |
| for (oursig = TARGET_SIGNAL_FIRST; |
| (int) oursig < (int) TARGET_SIGNAL_LAST; |
| oursig = (enum target_signal) ((int) oursig + 1)) |
| { |
| QUIT; |
| |
| if (oursig != TARGET_SIGNAL_UNKNOWN |
| && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
| sig_print_info (oursig); |
| } |
| |
| printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); |
| } |
| |
| struct inferior_status |
| { |
| enum target_signal stop_signal; |
| CORE_ADDR stop_pc; |
| bpstat stop_bpstat; |
| int stop_step; |
| int stop_stack_dummy; |
| int stopped_by_random_signal; |
| int trap_expected; |
| CORE_ADDR step_range_start; |
| CORE_ADDR step_range_end; |
| struct frame_id step_frame_id; |
| enum step_over_calls_kind step_over_calls; |
| CORE_ADDR step_resume_break_address; |
| int stop_after_trap; |
| int stop_soon; |
| struct regcache *stop_registers; |
| |
| /* These are here because if call_function_by_hand has written some |
| registers and then decides to call error(), we better not have changed |
| any registers. */ |
| struct regcache *registers; |
| |
| /* A frame unique identifier. */ |
| struct frame_id selected_frame_id; |
| |
| int breakpoint_proceeded; |
| int restore_stack_info; |
| int proceed_to_finish; |
| }; |
| |
| void |
| write_inferior_status_register (struct inferior_status *inf_status, int regno, |
| LONGEST val) |
| { |
| int size = register_size (current_gdbarch, regno); |
| void *buf = alloca (size); |
| store_signed_integer (buf, size, val); |
| regcache_raw_write (inf_status->registers, regno, buf); |
| } |
| |
| /* Save all of the information associated with the inferior<==>gdb |
| connection. INF_STATUS is a pointer to a "struct inferior_status" |
| (defined in inferior.h). */ |
| |
| struct inferior_status * |
| save_inferior_status (int restore_stack_info) |
| { |
| struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
| |
| inf_status->stop_signal = stop_signal; |
| inf_status->stop_pc = stop_pc; |
| inf_status->stop_step = stop_step; |
| inf_status->stop_stack_dummy = stop_stack_dummy; |
| inf_status->stopped_by_random_signal = stopped_by_random_signal; |
| inf_status->trap_expected = trap_expected; |
| inf_status->step_range_start = step_range_start; |
| inf_status->step_range_end = step_range_end; |
| inf_status->step_frame_id = step_frame_id; |
| inf_status->step_over_calls = step_over_calls; |
| inf_status->stop_after_trap = stop_after_trap; |
| inf_status->stop_soon = stop_soon; |
| /* Save original bpstat chain here; replace it with copy of chain. |
| If caller's caller is walking the chain, they'll be happier if we |
| hand them back the original chain when restore_inferior_status is |
| called. */ |
| inf_status->stop_bpstat = stop_bpstat; |
| stop_bpstat = bpstat_copy (stop_bpstat); |
| inf_status->breakpoint_proceeded = breakpoint_proceeded; |
| inf_status->restore_stack_info = restore_stack_info; |
| inf_status->proceed_to_finish = proceed_to_finish; |
| |
| inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
| |
| inf_status->registers = regcache_dup (current_regcache); |
| |
| inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
| return inf_status; |
| } |
| |
| static int |
| restore_selected_frame (void *args) |
| { |
| struct frame_id *fid = (struct frame_id *) args; |
| struct frame_info *frame; |
| |
| frame = frame_find_by_id (*fid); |
| |
| /* If inf_status->selected_frame_id is NULL, there was no previously |
| selected frame. */ |
| if (frame == NULL) |
| { |
| warning ("Unable to restore previously selected frame.\n"); |
| return 0; |
| } |
| |
| select_frame (frame); |
| |
| return (1); |
| } |
| |
| void |
| restore_inferior_status (struct inferior_status *inf_status) |
| { |
| stop_signal = inf_status->stop_signal; |
| stop_pc = inf_status->stop_pc; |
| stop_step = inf_status->stop_step; |
| stop_stack_dummy = inf_status->stop_stack_dummy; |
| stopped_by_random_signal = inf_status->stopped_by_random_signal; |
| trap_expected = inf_status->trap_expected; |
| step_range_start = inf_status->step_range_start; |
| step_range_end = inf_status->step_range_end; |
| step_frame_id = inf_status->step_frame_id; |
| step_over_calls = inf_status->step_over_calls; |
| stop_after_trap = inf_status->stop_after_trap; |
| stop_soon = inf_status->stop_soon; |
| bpstat_clear (&stop_bpstat); |
| stop_bpstat = inf_status->stop_bpstat; |
| breakpoint_proceeded = inf_status->breakpoint_proceeded; |
| proceed_to_finish = inf_status->proceed_to_finish; |
| |
| /* FIXME: Is the restore of stop_registers always needed. */ |
| regcache_xfree (stop_registers); |
| stop_registers = inf_status->stop_registers; |
| |
| /* The inferior can be gone if the user types "print exit(0)" |
| (and perhaps other times). */ |
| if (target_has_execution) |
| /* NB: The register write goes through to the target. */ |
| regcache_cpy (current_regcache, inf_status->registers); |
| regcache_xfree (inf_status->registers); |
| |
| /* FIXME: If we are being called after stopping in a function which |
| is called from gdb, we should not be trying to restore the |
| selected frame; it just prints a spurious error message (The |
| message is useful, however, in detecting bugs in gdb (like if gdb |
| clobbers the stack)). In fact, should we be restoring the |
| inferior status at all in that case? . */ |
| |
| if (target_has_stack && inf_status->restore_stack_info) |
| { |
| /* The point of catch_errors is that if the stack is clobbered, |
| walking the stack might encounter a garbage pointer and |
| error() trying to dereference it. */ |
| if (catch_errors |
| (restore_selected_frame, &inf_status->selected_frame_id, |
| "Unable to restore previously selected frame:\n", |
| RETURN_MASK_ERROR) == 0) |
| /* Error in restoring the selected frame. Select the innermost |
| frame. */ |
| select_frame (get_current_frame ()); |
| |
| } |
| |
| xfree (inf_status); |
| } |
| |
| static void |
| do_restore_inferior_status_cleanup (void *sts) |
| { |
| restore_inferior_status (sts); |
| } |
| |
| struct cleanup * |
| make_cleanup_restore_inferior_status (struct inferior_status *inf_status) |
| { |
| return make_cleanup (do_restore_inferior_status_cleanup, inf_status); |
| } |
| |
| void |
| discard_inferior_status (struct inferior_status *inf_status) |
| { |
| /* See save_inferior_status for info on stop_bpstat. */ |
| bpstat_clear (&inf_status->stop_bpstat); |
| regcache_xfree (inf_status->registers); |
| regcache_xfree (inf_status->stop_registers); |
| xfree (inf_status); |
| } |
| |
| int |
| inferior_has_forked (int pid, int *child_pid) |
| { |
| struct target_waitstatus last; |
| ptid_t last_ptid; |
| |
| get_last_target_status (&last_ptid, &last); |
| |
| if (last.kind != TARGET_WAITKIND_FORKED) |
| return 0; |
| |
| if (ptid_get_pid (last_ptid) != pid) |
| return 0; |
| |
| *child_pid = last.value.related_pid; |
| return 1; |
| } |
| |
| int |
| inferior_has_vforked (int pid, int *child_pid) |
| { |
| struct target_waitstatus last; |
| ptid_t last_ptid; |
| |
| get_last_target_status (&last_ptid, &last); |
| |
| if (last.kind != TARGET_WAITKIND_VFORKED) |
| return 0; |
| |
| if (ptid_get_pid (last_ptid) != pid) |
| return 0; |
| |
| *child_pid = last.value.related_pid; |
| return 1; |
| } |
| |
| int |
| inferior_has_execd (int pid, char **execd_pathname) |
| { |
| struct target_waitstatus last; |
| ptid_t last_ptid; |
| |
| get_last_target_status (&last_ptid, &last); |
| |
| if (last.kind != TARGET_WAITKIND_EXECD) |
| return 0; |
| |
| if (ptid_get_pid (last_ptid) != pid) |
| return 0; |
| |
| *execd_pathname = xstrdup (last.value.execd_pathname); |
| return 1; |
| } |
| |
| /* Oft used ptids */ |
| ptid_t null_ptid; |
| ptid_t minus_one_ptid; |
| |
| /* Create a ptid given the necessary PID, LWP, and TID components. */ |
| |
| ptid_t |
| ptid_build (int pid, long lwp, long tid) |
| { |
| ptid_t ptid; |
| |
| ptid.pid = pid; |
| ptid.lwp = lwp; |
| ptid.tid = tid; |
| return ptid; |
| } |
| |
| /* Create a ptid from just a pid. */ |
| |
| ptid_t |
| pid_to_ptid (int pid) |
| { |
| return ptid_build (pid, 0, 0); |
| } |
| |
| /* Fetch the pid (process id) component from a ptid. */ |
| |
| int |
| ptid_get_pid (ptid_t ptid) |
| { |
| return ptid.pid; |
| } |
| |
| /* Fetch the lwp (lightweight process) component from a ptid. */ |
| |
| long |
| ptid_get_lwp (ptid_t ptid) |
| { |
| return ptid.lwp; |
| } |
| |
| /* Fetch the tid (thread id) component from a ptid. */ |
| |
| long |
| ptid_get_tid (ptid_t ptid) |
| { |
| return ptid.tid; |
| } |
| |
| /* ptid_equal() is used to test equality of two ptids. */ |
| |
| int |
| ptid_equal (ptid_t ptid1, ptid_t ptid2) |
| { |
| return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp |
| && ptid1.tid == ptid2.tid); |
| } |
| |
| /* restore_inferior_ptid() will be used by the cleanup machinery |
| to restore the inferior_ptid value saved in a call to |
| save_inferior_ptid(). */ |
| |
| static void |
| restore_inferior_ptid (void *arg) |
| { |
| ptid_t *saved_ptid_ptr = arg; |
| inferior_ptid = *saved_ptid_ptr; |
| xfree (arg); |
| } |
| |
| /* Save the value of inferior_ptid so that it may be restored by a |
| later call to do_cleanups(). Returns the struct cleanup pointer |
| needed for later doing the cleanup. */ |
| |
| struct cleanup * |
| save_inferior_ptid (void) |
| { |
| ptid_t *saved_ptid_ptr; |
| |
| saved_ptid_ptr = xmalloc (sizeof (ptid_t)); |
| *saved_ptid_ptr = inferior_ptid; |
| return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); |
| } |
| |
| |
| static void |
| build_infrun (void) |
| { |
| stop_registers = regcache_xmalloc (current_gdbarch); |
| } |
| |
| void |
| _initialize_infrun (void) |
| { |
| int i; |
| int numsigs; |
| struct cmd_list_element *c; |
| |
| DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
| deprecated_register_gdbarch_swap (NULL, 0, build_infrun); |
| |
| add_info ("signals", signals_info, |
| "What debugger does when program gets various signals.\n\ |
| Specify a signal as argument to print info on that signal only."); |
| add_info_alias ("handle", "signals", 0); |
| |
| add_com ("handle", class_run, handle_command, |
| concat ("Specify how to handle a signal.\n\ |
| Args are signals and actions to apply to those signals.\n\ |
| Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
| from 1-15 are allowed for compatibility with old versions of GDB.\n\ |
| Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ |
| The special arg \"all\" is recognized to mean all signals except those\n\ |
| used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
| \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
| Stop means reenter debugger if this signal happens (implies print).\n\ |
| Print means print a message if this signal happens.\n\ |
| Pass means let program see this signal; otherwise program doesn't know.\n\ |
| Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
| Pass and Stop may be combined.", NULL)); |
| if (xdb_commands) |
| { |
| add_com ("lz", class_info, signals_info, |
| "What debugger does when program gets various signals.\n\ |
| Specify a signal as argument to print info on that signal only."); |
| add_com ("z", class_run, xdb_handle_command, |
| concat ("Specify how to handle a signal.\n\ |
| Args are signals and actions to apply to those signals.\n\ |
| Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
| from 1-15 are allowed for compatibility with old versions of GDB.\n\ |
| Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ |
| The special arg \"all\" is recognized to mean all signals except those\n\ |
| used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
| \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
| nopass), \"Q\" (noprint)\n\ |
| Stop means reenter debugger if this signal happens (implies print).\n\ |
| Print means print a message if this signal happens.\n\ |
| Pass means let program see this signal; otherwise program doesn't know.\n\ |
| Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
| Pass and Stop may be combined.", NULL)); |
| } |
| |
| if (!dbx_commands) |
| stop_command = |
| add_cmd ("stop", class_obscure, not_just_help_class_command, |
| "There is no `stop' command, but you can set a hook on `stop'.\n\ |
| This allows you to set a list of commands to be run each time execution\n\ |
| of the program stops.", &cmdlist); |
| |
| add_set_cmd ("infrun", class_maintenance, var_zinteger, |
| &debug_infrun, "Set inferior debugging.\n\ |
| When non-zero, inferior specific debugging is enabled.", &setdebuglist); |
| |
| numsigs = (int) TARGET_SIGNAL_LAST; |
| signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
| signal_print = (unsigned char *) |
| xmalloc (sizeof (signal_print[0]) * numsigs); |
| signal_program = (unsigned char *) |
| xmalloc (sizeof (signal_program[0]) * numsigs); |
| for (i = 0; i < numsigs; i++) |
| { |
| signal_stop[i] = 1; |
| signal_print[i] = 1; |
| signal_program[i] = 1; |
| } |
| |
| /* Signals caused by debugger's own actions |
| should not be given to the program afterwards. */ |
| signal_program[TARGET_SIGNAL_TRAP] = 0; |
| signal_program[TARGET_SIGNAL_INT] = 0; |
| |
| /* Signals that are not errors should not normally enter the debugger. */ |
| signal_stop[TARGET_SIGNAL_ALRM] = 0; |
| signal_print[TARGET_SIGNAL_ALRM] = 0; |
| signal_stop[TARGET_SIGNAL_VTALRM] = 0; |
| signal_print[TARGET_SIGNAL_VTALRM] = 0; |
| signal_stop[TARGET_SIGNAL_PROF] = 0; |
| signal_print[TARGET_SIGNAL_PROF] = 0; |
| signal_stop[TARGET_SIGNAL_CHLD] = 0; |
| signal_print[TARGET_SIGNAL_CHLD] = 0; |
| signal_stop[TARGET_SIGNAL_IO] = 0; |
| signal_print[TARGET_SIGNAL_IO] = 0; |
| signal_stop[TARGET_SIGNAL_POLL] = 0; |
| signal_print[TARGET_SIGNAL_POLL] = 0; |
| signal_stop[TARGET_SIGNAL_URG] = 0; |
| signal_print[TARGET_SIGNAL_URG] = 0; |
| signal_stop[TARGET_SIGNAL_WINCH] = 0; |
| signal_print[TARGET_SIGNAL_WINCH] = 0; |
| |
| /* These signals are used internally by user-level thread |
| implementations. (See signal(5) on Solaris.) Like the above |
| signals, a healthy program receives and handles them as part of |
| its normal operation. */ |
| signal_stop[TARGET_SIGNAL_LWP] = 0; |
| signal_print[TARGET_SIGNAL_LWP] = 0; |
| signal_stop[TARGET_SIGNAL_WAITING] = 0; |
| signal_print[TARGET_SIGNAL_WAITING] = 0; |
| signal_stop[TARGET_SIGNAL_CANCEL] = 0; |
| signal_print[TARGET_SIGNAL_CANCEL] = 0; |
| |
| #ifdef SOLIB_ADD |
| deprecated_add_show_from_set |
| (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, |
| (char *) &stop_on_solib_events, |
| "Set stopping for shared library events.\n\ |
| If nonzero, gdb will give control to the user when the dynamic linker\n\ |
| notifies gdb of shared library events. The most common event of interest\n\ |
| to the user would be loading/unloading of a new library.\n", |
| &setlist), |
| &showlist); |
| #endif |
| |
| c = add_set_enum_cmd ("follow-fork-mode", |
| class_run, |
| follow_fork_mode_kind_names, &follow_fork_mode_string, |
| "Set debugger response to a program call of fork \ |
| or vfork.\n\ |
| A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
| parent - the original process is debugged after a fork\n\ |
| child - the new process is debugged after a fork\n\ |
| The unfollowed process will continue to run.\n\ |
| By default, the debugger will follow the parent process.", &setlist); |
| deprecated_add_show_from_set (c, &showlist); |
| |
| c = add_set_enum_cmd ("scheduler-locking", class_run, |
| scheduler_enums, /* array of string names */ |
| &scheduler_mode, /* current mode */ |
| "Set mode for locking scheduler during execution.\n\ |
| off == no locking (threads may preempt at any time)\n\ |
| on == full locking (no thread except the current thread may run)\n\ |
| step == scheduler locked during every single-step operation.\n\ |
| In this mode, no other thread may run during a step command.\n\ |
| Other threads may run while stepping over a function call ('next').", |
| &setlist); |
| |
| set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
| deprecated_add_show_from_set (c, &showlist); |
| |
| c = add_set_cmd ("step-mode", class_run, |
| var_boolean, (char *) &step_stop_if_no_debug, |
| "Set mode of the step operation. When set, doing a step over a\n\ |
| function without debug line information will stop at the first\n\ |
| instruction of that function. Otherwise, the function is skipped and\n\ |
| the step command stops at a different source line.", &setlist); |
| deprecated_add_show_from_set (c, &showlist); |
| |
| /* ptid initializations */ |
| null_ptid = ptid_build (0, 0, 0); |
| minus_one_ptid = ptid_build (-1, 0, 0); |
| inferior_ptid = null_ptid; |
| target_last_wait_ptid = minus_one_ptid; |
| } |