#include "event-top.h"
#include "record.h"
#include "inline-frame.h"
+#include "jit.h"
/* Prototypes for local functions */
static ptid_t previous_inferior_ptid;
+/* Default behavior is to detach newly forked processes (legacy). */
+int detach_fork = 1;
+
int debug_displaced = 0;
static void
show_debug_displaced (struct ui_file *file, int from_tty,
insert_breakpoints ();
}
+/* The child has exited or execed: resume threads of the parent the
+ user wanted to be executing. */
+
+static int
+proceed_after_vfork_done (struct thread_info *thread,
+ void *arg)
+{
+ int pid = * (int *) arg;
+
+ if (ptid_get_pid (thread->ptid) == pid
+ && is_running (thread->ptid)
+ && !is_executing (thread->ptid)
+ && !thread->stop_requested
+ && thread->stop_signal == TARGET_SIGNAL_0)
+ {
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: resuming vfork parent thread %s\n",
+ target_pid_to_str (thread->ptid));
+
+ switch_to_thread (thread->ptid);
+ clear_proceed_status ();
+ proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0);
+ }
+
+ return 0;
+}
+
+/* Called whenever we notice an exec or exit event, to handle
+ detaching or resuming a vfork parent. */
+
+static void
+handle_vfork_child_exec_or_exit (int exec)
+{
+ struct inferior *inf = current_inferior ();
+
+ if (inf->vfork_parent)
+ {
+ int resume_parent = -1;
+
+ /* This exec or exit marks the end of the shared memory region
+ between the parent and the child. If the user wanted to
+ detach from the parent, now is the time. */
+
+ if (inf->vfork_parent->pending_detach)
+ {
+ struct thread_info *tp;
+ struct cleanup *old_chain;
+ struct program_space *pspace;
+ struct address_space *aspace;
+
+ /* follow-fork child, detach-on-fork on */
+
+ old_chain = make_cleanup_restore_current_thread ();
+
+ /* We're letting loose of the parent. */
+ tp = any_live_thread_of_process (inf->vfork_parent->pid);
+ switch_to_thread (tp->ptid);
+
+ /* We're about to detach from the parent, which implicitly
+ removes breakpoints from its address space. There's a
+ catch here: we want to reuse the spaces for the child,
+ but, parent/child are still sharing the pspace at this
+ point, although the exec in reality makes the kernel give
+ the child a fresh set of new pages. The problem here is
+ that the breakpoints module being unaware of this, would
+ likely chose the child process to write to the parent
+ address space. Swapping the child temporarily away from
+ the spaces has the desired effect. Yes, this is "sort
+ of" a hack. */
+
+ pspace = inf->pspace;
+ aspace = inf->aspace;
+ inf->aspace = NULL;
+ inf->pspace = NULL;
+
+ if (debug_infrun || info_verbose)
+ {
+ target_terminal_ours ();
+
+ if (exec)
+ fprintf_filtered (gdb_stdlog,
+ "Detaching vfork parent process %d after child exec.\n",
+ inf->vfork_parent->pid);
+ else
+ fprintf_filtered (gdb_stdlog,
+ "Detaching vfork parent process %d after child exit.\n",
+ inf->vfork_parent->pid);
+ }
+
+ target_detach (NULL, 0);
+
+ /* Put it back. */
+ inf->pspace = pspace;
+ inf->aspace = aspace;
+
+ do_cleanups (old_chain);
+ }
+ else if (exec)
+ {
+ /* We're staying attached to the parent, so, really give the
+ child a new address space. */
+ inf->pspace = add_program_space (maybe_new_address_space ());
+ inf->aspace = inf->pspace->aspace;
+ inf->removable = 1;
+ set_current_program_space (inf->pspace);
+
+ resume_parent = inf->vfork_parent->pid;
+
+ /* Break the bonds. */
+ inf->vfork_parent->vfork_child = NULL;
+ }
+ else
+ {
+ struct cleanup *old_chain;
+ struct program_space *pspace;
+
+ /* If this is a vfork child exiting, then the pspace and
+ aspaces were shared with the parent. Since we're
+ reporting the process exit, we'll be mourning all that is
+ found in the address space, and switching to null_ptid,
+ preparing to start a new inferior. But, since we don't
+ want to clobber the parent's address/program spaces, we
+ go ahead and create a new one for this exiting
+ inferior. */
+
+ /* Switch to null_ptid, so that clone_program_space doesn't want
+ to read the selected frame of a dead process. */
+ old_chain = save_inferior_ptid ();
+ inferior_ptid = null_ptid;
+
+ /* This inferior is dead, so avoid giving the breakpoints
+ module the option to write through to it (cloning a
+ program space resets breakpoints). */
+ inf->aspace = NULL;
+ inf->pspace = NULL;
+ pspace = add_program_space (maybe_new_address_space ());
+ set_current_program_space (pspace);
+ inf->removable = 1;
+ clone_program_space (pspace, inf->vfork_parent->pspace);
+ inf->pspace = pspace;
+ inf->aspace = pspace->aspace;
+
+ /* Put back inferior_ptid. We'll continue mourning this
+ inferior. */
+ do_cleanups (old_chain);
+
+ resume_parent = inf->vfork_parent->pid;
+ /* Break the bonds. */
+ inf->vfork_parent->vfork_child = NULL;
+ }
+
+ inf->vfork_parent = NULL;
+
+ gdb_assert (current_program_space == inf->pspace);
+
+ if (non_stop && resume_parent != -1)
+ {
+ /* If the user wanted the parent to be running, let it go
+ free now. */
+ struct cleanup *old_chain = make_cleanup_restore_current_thread ();
+
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "infrun: resuming vfork parent process %d\n",
+ resume_parent);
+
+ iterate_over_threads (proceed_after_vfork_done, &resume_parent);
+
+ do_cleanups (old_chain);
+ }
+ }
+}
+
+/* Enum strings for "set|show displaced-stepping". */
+
+static const char follow_exec_mode_new[] = "new";
+static const char follow_exec_mode_same[] = "same";
+static const char *follow_exec_mode_names[] =
+{
+ follow_exec_mode_new,
+ follow_exec_mode_same,
+ NULL,
+};
+
+static const char *follow_exec_mode_string = follow_exec_mode_same;
+static void
+show_follow_exec_mode_string (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value);
+}
+
/* EXECD_PATHNAME is assumed to be non-NULL. */
static void
{
struct target_ops *tgt;
struct thread_info *th = inferior_thread ();
+ struct inferior *inf = current_inferior ();
/* 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
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. */
+
+ mark_breakpoints_out ();
+
update_breakpoints_after_exec ();
/* If there was one, it's gone now. We cannot truly step-to-next
th->stop_requested = 0;
/* What is this a.out's name? */
- printf_unfiltered (_("Executing new program: %s\n"), execd_pathname);
+ printf_unfiltered (_("%s is executing new program: %s\n"),
+ target_pid_to_str (inferior_ptid),
+ execd_pathname);
/* We've followed the inferior through an exec. Therefore, the
inferior has essentially been killed & reborn. */
execd_pathname = name;
}
- /* That a.out is now the one to use. */
- exec_file_attach (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. */
previous incarnation of this process. */
no_shared_libraries (NULL, 0);
+ if (follow_exec_mode_string == follow_exec_mode_new)
+ {
+ struct program_space *pspace;
+ struct inferior *new_inf;
+
+ /* The user wants to keep the old inferior and program spaces
+ around. Create a new fresh one, and switch to it. */
+
+ inf = add_inferior (current_inferior ()->pid);
+ pspace = add_program_space (maybe_new_address_space ());
+ inf->pspace = pspace;
+ inf->aspace = pspace->aspace;
+
+ exit_inferior_num_silent (current_inferior ()->num);
+
+ set_current_inferior (inf);
+ set_current_program_space (pspace);
+ }
+
+ gdb_assert (current_program_space == inf->pspace);
+
+ /* That a.out is now the one to use. */
+ exec_file_attach (execd_pathname, 0);
+
/* Load the main file's symbols. */
symbol_file_add_main (execd_pathname, 0);
solib_create_inferior_hook ();
#endif
+ jit_inferior_created_hook ();
+
/* Reinsert all breakpoints. (Those which were symbolic have
been reset to the proper address in the new a.out, thanks
to symbol_file_command...) */
struct displaced_step_request *head;
ptid_t ptid;
struct regcache *regcache;
+ struct gdbarch *gdbarch;
CORE_ADDR actual_pc;
+ struct address_space *aspace;
head = displaced_step_request_queue;
ptid = head->ptid;
regcache = get_thread_regcache (ptid);
actual_pc = regcache_read_pc (regcache);
+ aspace = get_regcache_aspace (regcache);
- if (breakpoint_here_p (actual_pc))
+ if (breakpoint_here_p (aspace, actual_pc))
{
if (debug_displaced)
fprintf_unfiltered (gdb_stdlog,
displaced_step_prepare (ptid);
+ gdbarch = get_regcache_arch (regcache);
+
if (debug_displaced)
{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ CORE_ADDR actual_pc = regcache_read_pc (regcache);
gdb_byte buf[4];
fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ",
displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf));
}
- target_resume (ptid, 1, TARGET_SIGNAL_0);
+ if (gdbarch_displaced_step_hw_singlestep
+ (gdbarch, displaced_step_closure))
+ target_resume (ptid, 1, TARGET_SIGNAL_0);
+ else
+ target_resume (ptid, 0, TARGET_SIGNAL_0);
/* Done, we're stepping a thread. */
break;
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct thread_info *tp = inferior_thread ();
CORE_ADDR pc = regcache_read_pc (regcache);
+ struct address_space *aspace = get_regcache_aspace (regcache);
QUIT;
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 (pc) == permanent_breakpoint_here)
+ if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here)
{
if (gdbarch_skip_permanent_breakpoint_p (gdbarch))
gdbarch_skip_permanent_breakpoint (gdbarch, regcache);
comments in the handle_inferior event for dealing with 'random
signals' explain what we do instead. */
if (use_displaced_stepping (gdbarch)
- && tp->trap_expected
+ && (tp->trap_expected
+ || (step && gdbarch_software_single_step_p (gdbarch)))
&& sig == TARGET_SIGNAL_0)
{
if (!displaced_step_prepare (inferior_ptid))
discard_cleanups (old_cleanups);
return;
}
+
+ step = gdbarch_displaced_step_hw_singlestep
+ (gdbarch, displaced_step_closure);
}
/* Do we need to do it the hard way, w/temp breakpoints? */
- if (step)
+ else if (step)
step = maybe_software_singlestep (gdbarch, pc);
if (should_resume)
/* 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 && breakpoint_inserted_here_p (pc))
+ if (step && breakpoint_inserted_here_p (aspace, pc))
step = 0;
}
void
clear_proceed_status (void)
{
+ if (!non_stop)
+ {
+ /* In all-stop mode, delete the per-thread status of all
+ threads, even if inferior_ptid is null_ptid, there may be
+ threads on the list. E.g., we may be launching a new
+ process, while selecting the executable. */
+ iterate_over_threads (clear_proceed_status_callback, NULL);
+ }
+
if (!ptid_equal (inferior_ptid, null_ptid))
{
struct inferior *inferior;
if (non_stop)
{
- /* If in non-stop mode, only delete the per-thread status
- of the current thread. */
+ /* If in non-stop mode, only delete the per-thread status of
+ the current thread. */
clear_proceed_status_thread (inferior_thread ());
}
- else
- {
- /* In all-stop mode, delete the per-thread status of
- *all* threads. */
- iterate_over_threads (clear_proceed_status_callback, NULL);
- }
-
+
inferior = current_inferior ();
inferior->stop_soon = NO_STOP_QUIETLY;
}
{
struct regcache *regcache = get_thread_regcache (wait_ptid);
- if (breakpoint_here_p (regcache_read_pc (regcache)))
+ if (breakpoint_here_p (get_regcache_aspace (regcache),
+ regcache_read_pc (regcache)))
{
/* If stepping, remember current thread to switch back to. */
if (step)
struct gdbarch *gdbarch;
struct thread_info *tp;
CORE_ADDR pc;
+ struct address_space *aspace;
int oneproc = 0;
/* If we're stopped at a fork/vfork, follow the branch set by the
regcache = get_current_regcache ();
gdbarch = get_regcache_arch (regcache);
+ aspace = get_regcache_aspace (regcache);
pc = regcache_read_pc (regcache);
if (step > 0)
if (addr == (CORE_ADDR) -1)
{
- if (pc == stop_pc && breakpoint_here_p (pc)
+ if (pc == stop_pc && breakpoint_here_p (aspace, pc)
&& execution_direction != EXEC_REVERSE)
/* There is a breakpoint at the address we will resume at,
step one instruction before inserting breakpoints so that
static void init_execution_control_state (struct execution_control_state *ecs);
-void handle_inferior_event (struct execution_control_state *ecs);
+static void handle_inferior_event (struct execution_control_state *ecs);
static void handle_step_into_function (struct gdbarch *gdbarch,
struct execution_control_state *ecs);
char *status_string = target_waitstatus_to_string (ws);
struct ui_file *tmp_stream = mem_fileopen ();
char *text;
- long len;
/* The text is split over several lines because it was getting too long.
Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
"infrun: %s\n",
status_string);
- text = ui_file_xstrdup (tmp_stream, &len);
+ text = ui_file_xstrdup (tmp_stream, NULL);
/* This uses %s in part to handle %'s in the text, but also to avoid
a gcc error: the format attribute requires a string literal. */
ecs = &ecss;
memset (ecs, 0, sizeof (*ecs));
- overlay_cache_invalid = 1;
-
/* We'll update this if & when we switch to a new thread. */
previous_inferior_ptid = inferior_ptid;
- /* 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)
{
struct cleanup *old_chain;
+ /* 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. */
+
+ overlay_cache_invalid = 1;
+ registers_changed ();
+
if (deprecated_target_wait_hook)
ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0);
else
state. */
old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid);
+ if (ecs->ws.kind == TARGET_WAITKIND_SYSCALL_ENTRY
+ || ecs->ws.kind == TARGET_WAITKIND_SYSCALL_RETURN)
+ ecs->ws.value.syscall_number = UNKNOWN_SYSCALL;
+
/* Now figure out what to do with the result of the result. */
handle_inferior_event (ecs);
memset (ecs, 0, sizeof (*ecs));
- overlay_cache_invalid = 1;
-
- /* We can only rely on wait_for_more being correct before handling
- the event in all-stop, but previous_inferior_ptid isn't used in
- non-stop. */
- if (!ecs->wait_some_more)
- /* We'll update this if & when we switch to a new thread. */
- previous_inferior_ptid = inferior_ptid;
+ /* We'll update this if & when we switch to a new thread. */
+ previous_inferior_ptid = inferior_ptid;
if (non_stop)
/* In non-stop mode, the user/frontend should not notice a thread
targets that provide critical registers as part of their normal
status mechanism. */
+ overlay_cache_invalid = 1;
registers_changed ();
if (deprecated_target_wait_hook)
{
struct regcache *regcache;
struct gdbarch *gdbarch;
+ struct address_space *aspace;
CORE_ADDR breakpoint_pc;
/* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
if (gdbarch_decr_pc_after_break (gdbarch) == 0)
return;
+ aspace = get_regcache_aspace (regcache);
+
/* Find the location where (if we've hit a breakpoint) the
breakpoint would be. */
breakpoint_pc = regcache_read_pc (regcache)
already queued and arrive later. To suppress those spurious
SIGTRAPs, we keep a list of such breakpoint locations for a bit,
and retire them after a number of stop events are reported. */
- if (software_breakpoint_inserted_here_p (breakpoint_pc)
- || (non_stop && moribund_breakpoint_here_p (breakpoint_pc)))
+ if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc)
+ || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc)))
{
struct cleanup *old_cleanups = NULL;
if (RECORD_IS_USED)
return 0;
}
+/* Auxiliary function that handles syscall entry/return events.
+ It returns 1 if the inferior should keep going (and GDB
+ should ignore the event), or 0 if the event deserves to be
+ processed. */
+
+static int
+handle_syscall_event (struct execution_control_state *ecs)
+{
+ struct regcache *regcache;
+ struct gdbarch *gdbarch;
+ int syscall_number;
+
+ if (!ptid_equal (ecs->ptid, inferior_ptid))
+ context_switch (ecs->ptid);
+
+ regcache = get_thread_regcache (ecs->ptid);
+ gdbarch = get_regcache_arch (regcache);
+ syscall_number = gdbarch_get_syscall_number (gdbarch, ecs->ptid);
+ stop_pc = regcache_read_pc (regcache);
+
+ target_last_waitstatus.value.syscall_number = syscall_number;
+
+ if (catch_syscall_enabled () > 0
+ && catching_syscall_number (syscall_number) > 0)
+ {
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n",
+ syscall_number);
+
+ ecs->event_thread->stop_bpstat
+ = bpstat_stop_status (get_regcache_aspace (regcache),
+ stop_pc, ecs->ptid);
+ ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat);
+
+ if (!ecs->random_signal)
+ {
+ /* Catchpoint hit. */
+ ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP;
+ return 0;
+ }
+ }
+
+ /* If no catchpoint triggered for this, then keep going. */
+ ecs->event_thread->stop_signal = TARGET_SIGNAL_0;
+ keep_going (ecs);
+ return 1;
+}
+
/* 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. */
-void
+static void
handle_inferior_event (struct execution_control_state *ecs)
{
struct frame_info *frame;
struct symtab_and_line stop_pc_sal;
enum stop_kind stop_soon;
+ if (ecs->ws.kind == TARGET_WAITKIND_IGNORE)
+ {
+ /* 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. */
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n");
+ prepare_to_wait (ecs);
+ return;
+ }
+
if (ecs->ws.kind != TARGET_WAITKIND_EXITED
- && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED
- && ecs->ws.kind != TARGET_WAITKIND_IGNORE)
+ && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED)
{
struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid));
gdb_assert (inf);
/* Dependent on the current PC value modified by adjust_pc_after_break. */
reinit_frame_cache ();
- if (ecs->ws.kind != TARGET_WAITKIND_IGNORE)
- {
- breakpoint_retire_moribund ();
-
- /* Mark the non-executing threads accordingly. In all-stop, all
- threads of all processes are stopped when we get any event
- reported. In non-stop mode, only the event thread stops. If
- we're handling a process exit in non-stop mode, there's
- nothing to do, as threads of the dead process are gone, and
- threads of any other process were left running. */
- if (!non_stop)
- set_executing (minus_one_ptid, 0);
- else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED
- && ecs->ws.kind != TARGET_WAITKIND_EXITED)
- set_executing (inferior_ptid, 0);
- }
+ breakpoint_retire_moribund ();
+
+ /* Mark the non-executing threads accordingly. In all-stop, all
+ threads of all processes are stopped when we get any event
+ reported. In non-stop mode, only the event thread stops. If
+ we're handling a process exit in non-stop mode, there's nothing
+ to do, as threads of the dead process are gone, and threads of
+ any other process were left running. */
+ if (!non_stop)
+ set_executing (minus_one_ptid, 0);
+ else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED
+ && ecs->ws.kind != TARGET_WAITKIND_EXITED)
+ set_executing (inferior_ptid, 0);
switch (infwait_state)
{
case infwait_thread_hop_state:
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n");
- /* Cancel the waiton_ptid. */
- waiton_ptid = pid_to_ptid (-1);
break;
case infwait_normal_state:
default:
internal_error (__FILE__, __LINE__, _("bad switch"));
}
+
infwait_state = infwait_normal_state;
+ waiton_ptid = pid_to_ptid (-1);
switch (ecs->ws.kind)
{
dynamically loaded objects (among other things). */
if (stop_on_solib_events)
{
+ /* Make sure we print "Stopped due to solib-event" in
+ normal_stop. */
+ stop_print_frame = 1;
+
stop_stepping (ecs);
return;
}
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n");
inferior_ptid = ecs->ptid;
+ set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid)));
+ set_current_program_space (current_inferior ()->pspace);
+ handle_vfork_child_exec_or_exit (0);
target_terminal_ours (); /* Must do this before mourn anyway */
print_stop_reason (EXITED, ecs->ws.value.integer);
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n");
inferior_ptid = ecs->ptid;
+ set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid)));
+ set_current_program_space (current_inferior ()->pspace);
+ handle_vfork_child_exec_or_exit (0);
stop_print_frame = 0;
target_terminal_ours (); /* Must do this before mourn anyway */
stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
- ecs->event_thread->stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
+ ecs->event_thread->stop_bpstat
+ = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
+ stop_pc, ecs->ptid);
- ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat);
+ /* Note that we're interested in knowing the bpstat actually
+ causes a stop, not just if it may explain the signal.
+ Software watchpoints, for example, always appear in the
+ bpstat. */
+ ecs->random_signal = !bpstat_causes_stop (ecs->event_thread->stop_bpstat);
/* If no catchpoint triggered for this, then keep going. */
if (ecs->random_signal)
{
+ ptid_t parent;
+ ptid_t child;
int should_resume;
+ int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
ecs->event_thread->stop_signal = TARGET_SIGNAL_0;
should_resume = follow_fork ();
+ parent = ecs->ptid;
+ child = ecs->ws.value.related_pid;
+
+ /* In non-stop mode, also resume the other branch. */
+ if (non_stop && !detach_fork)
+ {
+ if (follow_child)
+ switch_to_thread (parent);
+ else
+ switch_to_thread (child);
+
+ ecs->event_thread = inferior_thread ();
+ ecs->ptid = inferior_ptid;
+ keep_going (ecs);
+ }
+
+ if (follow_child)
+ switch_to_thread (child);
+ else
+ switch_to_thread (parent);
+
ecs->event_thread = inferior_thread ();
ecs->ptid = inferior_ptid;
ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP;
goto process_event_stop_test;
+ case TARGET_WAITKIND_VFORK_DONE:
+ /* Done with the shared memory region. Re-insert breakpoints in
+ the parent, and keep going. */
+
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORK_DONE\n");
+
+ if (!ptid_equal (ecs->ptid, inferior_ptid))
+ context_switch (ecs->ptid);
+
+ current_inferior ()->waiting_for_vfork_done = 0;
+ current_inferior ()->pspace->breakpoints_not_allowed = 0;
+ /* This also takes care of reinserting breakpoints in the
+ previously locked inferior. */
+ keep_going (ecs);
+ return;
+
case TARGET_WAITKIND_EXECD:
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n");
stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
+ /* Do whatever is necessary to the parent branch of the vfork. */
+ handle_vfork_child_exec_or_exit (1);
+
/* This causes the eventpoints and symbol table to be reset.
Must do this now, before trying to determine whether to
stop. */
follow_exec (inferior_ptid, ecs->ws.value.execd_pathname);
- ecs->event_thread->stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
+ ecs->event_thread->stop_bpstat
+ = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
+ stop_pc, ecs->ptid);
ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat);
/* Note that this may be referenced from inside
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;
+ /* Getting the current syscall number */
+ if (handle_syscall_event (ecs) != 0)
+ return;
+ goto process_event_stop_test;
/* Before examining the threads further, step this thread to
get it entirely out of the syscall. (We get notice of the
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;
+ if (handle_syscall_event (ecs) != 0)
+ return;
+ goto process_event_stop_test;
case TARGET_WAITKIND_STOPPED:
if (debug_infrun)
print_stop_reason (NO_HISTORY, 0);
stop_stepping (ecs);
return;
-
- /* 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;
}
if (ecs->new_thread_event)
{
struct regcache *regcache = get_thread_regcache (ecs->ptid);
struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct cleanup *old_chain = save_inferior_ptid ();
+
+ inferior_ptid = ecs->ptid;
fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n",
paddress (gdbarch, stop_pc));
fprintf_unfiltered (gdb_stdlog,
"infrun: (no data address available)\n");
}
+
+ do_cleanups (old_chain);
}
if (stepping_past_singlestep_breakpoint)
singlestep_breakpoints_inserted_p = 0;
ecs->random_signal = 0;
+ ecs->event_thread->trap_expected = 0;
context_switch (saved_singlestep_ptid);
if (deprecated_context_hook)
if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP)
{
int thread_hop_needed = 0;
+ struct address_space *aspace = get_regcache_aspace (get_current_regcache ());
/* 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 (regular_breakpoint_inserted_here_p (stop_pc))
+ if (regular_breakpoint_inserted_here_p (aspace, stop_pc))
{
ecs->random_signal = 0;
- if (!breakpoint_thread_match (stop_pc, ecs->ptid))
+ if (!breakpoint_thread_match (aspace, stop_pc, ecs->ptid))
thread_hop_needed = 1;
}
else if (singlestep_breakpoints_inserted_p)
ecs->event_thread->stepping_over_breakpoint = 1;
keep_going (ecs);
- registers_changed ();
return;
}
}
/* Single step */
hw_step = maybe_software_singlestep (gdbarch, stop_pc);
target_resume (ecs->ptid, hw_step, TARGET_SIGNAL_0);
- registers_changed ();
waiton_ptid = ecs->ptid;
if (target_have_steppable_watchpoint)
infwait_state = infwait_step_watch_state;
non-standard signals can't be explained by the breakpoint. */
if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP
|| (! ecs->event_thread->trap_expected
- && breakpoint_inserted_here_p (stop_pc)
+ && breakpoint_inserted_here_p (get_regcache_aspace (get_current_regcache ()),
+ stop_pc)
&& (ecs->event_thread->stop_signal == TARGET_SIGNAL_ILL
|| ecs->event_thread->stop_signal == TARGET_SIGNAL_SEGV
|| ecs->event_thread->stop_signal == TARGET_SIGNAL_EMT))
}
/* See if there is a breakpoint at the current PC. */
- ecs->event_thread->stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
-
+ ecs->event_thread->stop_bpstat
+ = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()),
+ stop_pc, ecs->ptid);
+
/* Following in case break condition called a
function. */
stop_print_frame = 1;
+ /* This is where we handle "moribund" watchpoints. Unlike
+ software breakpoints traps, hardware watchpoint traps are
+ always distinguishable from random traps. If no high-level
+ watchpoint is associated with the reported stop data address
+ anymore, then the bpstat does not explain the signal ---
+ simply make sure to ignore it if `stopped_by_watchpoint' is
+ set. */
+
+ if (debug_infrun
+ && ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP
+ && !bpstat_explains_signal (ecs->event_thread->stop_bpstat)
+ && stopped_by_watchpoint)
+ fprintf_unfiltered (gdb_stdlog, "\
+infrun: no user watchpoint explains watchpoint SIGTRAP, ignoring\n");
+
/* 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
if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP)
ecs->random_signal
= !(bpstat_explains_signal (ecs->event_thread->stop_bpstat)
+ || stopped_by_watchpoint
|| ecs->event_thread->trap_expected
|| (ecs->event_thread->step_range_end
&& ecs->event_thread->step_resume_breakpoint == NULL));
}
break;
+ case BPSTAT_WHAT_CHECK_JIT:
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_JIT\n");
+
+ /* Switch terminal for any messages produced by breakpoint_re_set. */
+ target_terminal_ours_for_output ();
+
+ jit_event_handler (gdbarch);
+
+ target_terminal_inferior ();
+
+ /* We want to step over this breakpoint, then keep going. */
+ ecs->event_thread->stepping_over_breakpoint = 1;
+
+ break;
+
case BPSTAT_WHAT_LAST:
/* Not a real code, but listed here to shut up gcc -Wall. */
struct symtab_and_line sr_sal;
init_sal (&sr_sal);
sr_sal.pc = pc_after_resolver;
+ sr_sal.pspace = get_frame_program_space (frame);
insert_step_resume_breakpoint_at_sal (gdbarch,
sr_sal, null_frame_id);
NOTE: frame_id_eq will never report two invalid frame IDs as
being equal, so to get into this block, both the current and
previous frame must have valid frame IDs. */
+ /* The outer_frame_id check is a heuristic to detect stepping
+ through startup code. If we step over an instruction which
+ sets the stack pointer from an invalid value to a valid value,
+ we may detect that as a subroutine call from the mythical
+ "outermost" function. This could be fixed by marking
+ outermost frames as !stack_p,code_p,special_p. Then the
+ initial outermost frame, before sp was valid, would
+ have code_addr == &_start. See the commend in frame_id_eq
+ for more. */
if (!frame_id_eq (get_stack_frame_id (frame),
ecs->event_thread->step_stack_frame_id)
- && (frame_id_eq (frame_unwind_caller_id (frame),
+ && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()),
ecs->event_thread->step_stack_frame_id)
- || execution_direction == EXEC_REVERSE))
+ && (!frame_id_eq (ecs->event_thread->step_stack_frame_id,
+ outer_frame_id)
+ || step_start_function != find_pc_function (stop_pc))))
{
CORE_ADDR real_stop_pc;
/* Reverse stepping through solib trampolines. */
if (execution_direction == EXEC_REVERSE
+ && ecs->event_thread->step_over_calls != STEP_OVER_NONE
&& (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc)
|| (ecs->stop_func_start == 0
&& in_solib_dynsym_resolve_code (stop_pc))))
/* Normal function call return (static or dynamic). */
init_sal (&sr_sal);
sr_sal.pc = ecs->stop_func_start;
- insert_step_resume_breakpoint_at_sal (gdbarch,
- sr_sal, null_frame_id);
+ sr_sal.pspace = get_frame_program_space (frame);
+ insert_step_resume_breakpoint_at_sal (gdbarch,
+ sr_sal, null_frame_id);
}
else
insert_step_resume_breakpoint_at_caller (frame);
struct symtab_and_line sr_sal;
init_sal (&sr_sal);
sr_sal.pc = ecs->stop_func_start;
+ sr_sal.pspace = get_frame_program_space (frame);
insert_step_resume_breakpoint_at_sal (gdbarch,
sr_sal, null_frame_id);
struct symtab_and_line tmp_sal;
tmp_sal = find_pc_line (ecs->stop_func_start, 0);
+ tmp_sal.pspace = get_frame_program_space (frame);
if (tmp_sal.line != 0)
{
if (execution_direction == EXEC_REVERSE)
struct symtab_and_line sr_sal;
init_sal (&sr_sal);
sr_sal.pc = ecs->stop_func_start;
+ sr_sal.pspace = get_frame_program_space (frame);
insert_step_resume_breakpoint_at_sal (gdbarch,
sr_sal, null_frame_id);
}
return;
}
+ /* Reverse stepping through solib trampolines. */
+
+ if (execution_direction == EXEC_REVERSE
+ && ecs->event_thread->step_over_calls != STEP_OVER_NONE)
+ {
+ if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc)
+ || (ecs->stop_func_start == 0
+ && in_solib_dynsym_resolve_code (stop_pc)))
+ {
+ /* Any solib trampoline code can be handled in reverse
+ by simply continuing to single-step. We have already
+ executed the solib function (backwards), and a few
+ steps will take us back through the trampoline to the
+ caller. */
+ keep_going (ecs);
+ return;
+ }
+ else if (in_solib_dynsym_resolve_code (stop_pc))
+ {
+ /* Stepped backward into the solib dynsym resolver.
+ Set a breakpoint at its start and continue, then
+ one more step will take us out. */
+ struct symtab_and_line sr_sal;
+ init_sal (&sr_sal);
+ sr_sal.pc = ecs->stop_func_start;
+ sr_sal.pspace = get_frame_program_space (frame);
+ insert_step_resume_breakpoint_at_sal (gdbarch,
+ sr_sal, null_frame_id);
+ 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 (gdbarch_in_solib_return_trampoline (gdbarch,
init_sal (&sr_sal); /* initialize to zeroes */
sr_sal.pc = real_stop_pc;
sr_sal.section = find_pc_overlay (sr_sal.pc);
+ sr_sal.pspace = get_frame_program_space (frame);
/* Do not specify what the fp should be when we stop since
on some machines the prologue is where the new fp value
init_sal (&sr_sal); /* initialize to zeroes */
sr_sal.pc = ecs->stop_func_start;
sr_sal.section = find_pc_overlay (ecs->stop_func_start);
+ sr_sal.pspace = get_frame_program_space (get_current_frame ());
/* Do not specify what the fp should be when we stop since on
some machines the prologue is where the new fp value is
gdbarch = get_frame_arch (return_frame);
sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame));
sr_sal.section = find_pc_overlay (sr_sal.pc);
+ sr_sal.pspace = get_frame_program_space (return_frame);
insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal,
get_stack_frame_id (return_frame));
sr_sal.pc = gdbarch_addr_bits_remove (gdbarch,
frame_unwind_caller_pc (next_frame));
sr_sal.section = find_pc_overlay (sr_sal.pc);
+ sr_sal.pspace = frame_unwind_program_space (next_frame);
insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal,
frame_unwind_caller_id (next_frame));
static void
keep_going (struct execution_control_state *ecs)
{
+ /* Make sure normal_stop is called if we get a QUIT handled before
+ reaching resume. */
+ struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
+
/* Save the pc before execution, to compare with pc after stop. */
ecs->event_thread->prev_pc
= regcache_read_pc (get_thread_regcache (ecs->ptid));
/* We took a signal (which we are supposed to pass through to
the inferior, else we'd not get here) and we haven't yet
gotten our trap. Simply continue. */
+
+ discard_cleanups (old_cleanups);
resume (currently_stepping (ecs->event_thread),
ecs->event_thread->stop_signal);
}
}
if (e.reason < 0)
{
+ exception_print (gdb_stderr, e);
stop_stepping (ecs);
return;
}
&& !signal_program[ecs->event_thread->stop_signal])
ecs->event_thread->stop_signal = TARGET_SIGNAL_0;
+ discard_cleanups (old_cleanups);
resume (currently_stepping (ecs->event_thread),
ecs->event_thread->stop_signal);
}
{
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n");
- if (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 ();
- waiton_ptid = pid_to_ptid (-1);
- }
/* 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. */
Delete any breakpoint that is to be deleted at the next stop. */
breakpoint_auto_delete (inferior_thread ()->stop_bpstat);
}
+
+ /* Try to get rid of automatically added inferiors that are no
+ longer needed. Keeping those around slows down things linearly.
+ Note that this never removes the current inferior. */
+ prune_inferiors ();
}
static int
return 1;
}
+int
+inferior_has_called_syscall (ptid_t pid, int *syscall_number)
+{
+ struct target_waitstatus last;
+ ptid_t last_ptid;
+
+ get_last_target_status (&last_ptid, &last);
+
+ if (last.kind != TARGET_WAITKIND_SYSCALL_ENTRY &&
+ last.kind != TARGET_WAITKIND_SYSCALL_RETURN)
+ return 0;
+
+ if (!ptid_equal (last_ptid, pid))
+ return 0;
+
+ *syscall_number = last.value.syscall_number;
+ return 1;
+}
+
/* Oft used ptids */
ptid_t null_ptid;
ptid_t minus_one_ptid;
show_follow_fork_mode_string,
&setlist, &showlist);
+ add_setshow_enum_cmd ("follow-exec-mode", class_run,
+ follow_exec_mode_names,
+ &follow_exec_mode_string, _("\
+Set debugger response to a program call of exec."), _("\
+Show debugger response to a program call of exec."), _("\
+An exec call replaces the program image of a process.\n\
+\n\
+follow-exec-mode can be:\n\
+\n\
+ new - the debugger creates a new inferior and rebinds the process \n\
+to this new inferior. The program the process was running before\n\
+the exec call can be restarted afterwards by restarting the original\n\
+inferior.\n\
+\n\
+ same - the debugger keeps the process bound to the same inferior.\n\
+The new executable image replaces the previous executable loaded in\n\
+the inferior. Restarting the inferior after the exec call restarts\n\
+the executable the process was running after the exec call.\n\
+\n\
+By default, the debugger will use the same inferior."),
+ NULL,
+ show_follow_exec_mode_string,
+ &setlist, &showlist);
+
add_setshow_enum_cmd ("scheduler-locking", class_run,
scheduler_enums, &scheduler_mode, _("\
Set mode for locking scheduler during execution."), _("\
set_exec_direction_func, show_exec_direction_func,
&setlist, &showlist);
+ /* Set/show detach-on-fork: user-settable mode. */
+
+ add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\
+Set whether gdb will detach the child of a fork."), _("\
+Show whether gdb will detach the child of a fork."), _("\
+Tells gdb whether to detach the child of a fork."),
+ NULL, NULL, &setlist, &showlist);
+
/* ptid initializations */
null_ptid = ptid_build (0, 0, 0);
minus_one_ptid = ptid_build (-1, 0, 0);
projects / deliverable / binutils-gdb.git / blobdiff