2007-06-25 Jan Kratochvil * inferior.h (enum resume_step): New definition. (resume): Change STEP parameter type to ENUM RESUME_STEP. * infrun.c (resume): Likewise. Extend debug printing of the STEP parameter. Lock the scheduler only for intentional stepping. (proceed): Replace the variable ONESTEP with tristate RESUME_STEP. Set the third RESUME_STEP state according to BPSTAT_SHOULD_STEP. (currently_stepping): Change the return type to ENUM RESUME_STEP. Return RESUME_STEP_NEEDED if it is just due to BPSTAT_SHOULD_STEP. * linux-nat.c (select_singlestep_lwp_callback): Do not focus on the software watchpoint events. * linux-nat.h (struct lwp_info): Redeclare STEP as ENUM RESUME_STEP. 2007-10-19 Jan Kratochvil * infrun.c (proceed): RESUME_STEP initialized for non-stepping. RESUME_STEP set according to STEP only at the end of the function. 2008-02-24 Jan Kratochvil Port to GDB-6.8pre. Index: gdb-7.6.90.20140127/gdb/inferior.h =================================================================== --- gdb-7.6.90.20140127.orig/gdb/inferior.h 2014-01-27 22:05:28.801895347 +0100 +++ gdb-7.6.90.20140127/gdb/inferior.h 2014-01-27 22:33:45.230157813 +0100 @@ -155,7 +155,15 @@ extern void reopen_exec_file (void); /* The `resume' routine should only be called in special circumstances. Normally, use `proceed', which handles a lot of bookkeeping. */ -extern void resume (int, enum gdb_signal); +enum resume_step + { + /* currently_stepping () should return non-zero for non-continue. */ + RESUME_STEP_CONTINUE = 0, + RESUME_STEP_USER, /* Stepping is intentional by the user. */ + RESUME_STEP_NEEDED /* Stepping only for software watchpoints. */ + }; + +extern void resume (enum resume_step, enum gdb_signal); extern ptid_t user_visible_resume_ptid (int step); Index: gdb-7.6.90.20140127/gdb/infrun.c =================================================================== --- gdb-7.6.90.20140127.orig/gdb/infrun.c 2014-01-27 22:05:28.804895349 +0100 +++ gdb-7.6.90.20140127/gdb/infrun.c 2014-01-27 22:35:12.781224279 +0100 @@ -83,7 +83,7 @@ static int follow_fork (void); static void set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c); -static int currently_stepping (struct thread_info *tp); +static enum resume_step currently_stepping (struct thread_info *tp); static int currently_stepping_or_nexting_callback (struct thread_info *tp, void *data); @@ -1699,7 +1699,8 @@ user_visible_resume_ptid (int step) } else if ((scheduler_mode == schedlock_on) || (scheduler_mode == schedlock_step - && (step || singlestep_breakpoints_inserted_p))) + && (step == RESUME_STEP_USER + || singlestep_breakpoints_inserted_p))) { /* User-settable 'scheduler' mode requires solo thread resume. */ resume_ptid = inferior_ptid; @@ -1717,7 +1718,7 @@ user_visible_resume_ptid (int step) 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 gdb_signal sig) +resume (enum resume_step step, enum gdb_signal sig) { int should_resume = 1; struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); @@ -1750,9 +1751,13 @@ resume (int step, enum gdb_signal sig) if (debug_infrun) fprintf_unfiltered (gdb_stdlog, - "infrun: resume (step=%d, signal=%s), " + "infrun: resume (step=%s, signal=%s), " "trap_expected=%d, current thread [%s] at %s\n", - step, gdb_signal_to_symbol_string (sig), + (step == RESUME_STEP_CONTINUE + ? "RESUME_STEP_CONTINUE" + : (step == RESUME_STEP_USER ? "RESUME_STEP_USER" + : "RESUME_STEP_NEEDED")), + gdb_signal_to_symbol_string (sig), tp->control.trap_expected, target_pid_to_str (inferior_ptid), paddress (gdbarch, pc)); @@ -2147,7 +2152,7 @@ proceed (CORE_ADDR addr, enum gdb_signal CORE_ADDR pc; struct address_space *aspace; /* GDB may force the inferior to step due to various reasons. */ - int force_step = 0; + enum resume_step resume_step = RESUME_STEP_CONTINUE; /* If we're stopped at a fork/vfork, follow the branch set by the "set follow-fork-mode" command; otherwise, we'll just proceed @@ -2187,13 +2192,13 @@ proceed (CORE_ADDR addr, enum gdb_signal actually be executing the breakpoint insn anyway. We'll be (un-)executing the previous instruction. */ - force_step = 1; + resume_step = RESUME_STEP_USER; else if (gdbarch_single_step_through_delay_p (gdbarch) && gdbarch_single_step_through_delay (gdbarch, get_current_frame ())) /* We stepped onto an instruction that needs to be stepped again before re-inserting the breakpoint, do so. */ - force_step = 1; + resume_step = RESUME_STEP_USER; } else { @@ -2225,13 +2230,13 @@ proceed (CORE_ADDR addr, enum gdb_signal is required it returns TRUE and sets the current thread to the old thread. */ if (prepare_to_proceed (step)) - force_step = 1; + resume_step = RESUME_STEP_USER; } /* prepare_to_proceed may change the current thread. */ tp = inferior_thread (); - if (force_step) + if (resume_step == RESUME_STEP_USER) { tp->control.trap_expected = 1; /* If displaced stepping is enabled, we can step over the @@ -2318,9 +2323,13 @@ proceed (CORE_ADDR addr, enum gdb_signal /* Reset to normal state. */ init_infwait_state (); + if (step) + resume_step = RESUME_STEP_USER; + if (resume_step == RESUME_STEP_CONTINUE && bpstat_should_step ()) + resume_step = RESUME_STEP_NEEDED; + /* Resume inferior. */ - resume (force_step || step || bpstat_should_step (), - tp->suspend.stop_signal); + resume (resume_step, tp->suspend.stop_signal); /* Wait for it to stop (if not standalone) and in any case decode why it stopped, and act accordingly. */ @@ -5332,13 +5341,18 @@ switch_back_to_stepped_thread (struct ex /* Is thread TP in the middle of single-stepping? */ -static int +static enum resume_step currently_stepping (struct thread_info *tp) { - return ((tp->control.step_range_end - && tp->control.step_resume_breakpoint == NULL) - || tp->control.trap_expected - || bpstat_should_step ()); + if ((tp->control.step_range_end + && tp->control.step_resume_breakpoint == NULL) + || tp->control.trap_expected) + return RESUME_STEP_USER; + + if (bpstat_should_step ()) + return RESUME_STEP_NEEDED; + + return RESUME_STEP_CONTINUE; } /* Returns true if any thread *but* the one passed in "data" is in the Index: gdb-7.6.90.20140127/gdb/linux-nat.c =================================================================== --- gdb-7.6.90.20140127.orig/gdb/linux-nat.c 2014-01-27 22:05:28.806895350 +0100 +++ gdb-7.6.90.20140127/gdb/linux-nat.c 2014-01-27 22:33:45.330157889 +0100 @@ -2697,7 +2697,11 @@ static int select_singlestep_lwp_callback (struct lwp_info *lp, void *data) { if (lp->last_resume_kind == resume_step - && lp->status != 0) + && lp->status != 0 + /* We do not focus on software watchpoints as we would not catch + STEPPING_PAST_SINGLESTEP_BREAKPOINT breakpoints in some other thread + as they would remain pending due to `Push back breakpoint for %s'. */ + && lp->step == RESUME_STEP_USER) return 1; else return 0; Index: gdb-7.6.90.20140127/gdb/linux-nat.h =================================================================== --- gdb-7.6.90.20140127.orig/gdb/linux-nat.h 2014-01-27 22:05:28.807895351 +0100 +++ gdb-7.6.90.20140127/gdb/linux-nat.h 2014-01-27 22:33:45.334157892 +0100 @@ -59,8 +59,8 @@ struct lwp_info /* If non-zero, a pending wait status. */ int status; - /* Non-zero if we were stepping this LWP. */ - int step; + /* The kind of stepping of this LWP. */ + enum resume_step step; /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data watchpoint trap. */