process.
Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
- 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
- Free Software Foundation, Inc.
+ 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+ 2008 Free Software Foundation, Inc.
This file is part of GDB.
static void set_schedlock_func (char *args, int from_tty,
struct cmd_list_element *c);
-struct execution_control_state;
+struct thread_stepping_state;
-static int currently_stepping (struct execution_control_state *ecs);
+static int currently_stepping (struct thread_stepping_state *tss);
static void xdb_handle_command (char *args, int from_tty);
void _initialize_infrun (void);
-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. */
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;
+int debug_displaced = 0;
+static void
+show_debug_displaced (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value);
+}
static int debug_infrun = 0;
static void
static int stop_print_frame;
+/* Step-resume or longjmp-resume breakpoint. */
static struct breakpoint *step_resume_breakpoint = NULL;
/* This is a cached copy of the pid/waitstatus of the last event
static ptid_t target_last_wait_ptid;
static struct target_waitstatus target_last_waitstatus;
+/* Context-switchable data. */
+struct thread_stepping_state
+{
+ /* Should we step over breakpoint next time keep_going
+ is called? */
+ int stepping_over_breakpoint;
+ struct symtab_and_line sal;
+ int current_line;
+ struct symtab *current_symtab;
+ int step_after_step_resume_breakpoint;
+ int stepping_through_solib_after_catch;
+ bpstat stepping_through_solib_catchpoints;
+};
+
+struct thread_stepping_state gtss;
+struct thread_stepping_state *tss = >ss;
+
+static void context_switch (ptid_t ptid);
+
+void init_thread_stepping_state (struct thread_stepping_state *tss);
+
+void init_infwait_state (void);
+
/* 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
enum target_waitkind kind;
struct
{
- int parent_pid;
- int child_pid;
+ ptid_t parent_pid;
+ ptid_t child_pid;
}
fork_event;
char *execd_pathname;
/* EXECD_PATHNAME is assumed to be non-NULL. */
static void
-follow_exec (int pid, char *execd_pathname)
+follow_exec (ptid_t pid, char *execd_pathname)
{
- int saved_pid = pid;
+ ptid_t 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.
/* 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);
+ generic_mourn_inferior ();
/* Because mourn_inferior resets inferior_ptid. */
- push_target (tgt);
+ inferior_ptid = saved_pid;
+
+ if (gdb_sysroot && *gdb_sysroot)
+ {
+ char *name = alloca (strlen (gdb_sysroot)
+ + strlen (execd_pathname)
+ + 1);
+ strcpy (name, gdb_sysroot);
+ strcat (name, execd_pathname);
+ execd_pathname = name;
+ }
/* That a.out is now the one to use. */
exec_file_attach (execd_pathname, 0);
- /* And also is where symbols can be found. */
+ /* 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. */
+ /* Also, loading a symbol file below may trigger symbol lookups, and
+ we don't want those to be satisfied by the libraries of the
+ previous incarnation of this process. */
+ no_shared_libraries (NULL, 0);
+
+ /* Load the main file's symbols. */
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));
#else
stepping the thread user has selected. */
static ptid_t deferred_step_ptid;
\f
+/* Displaced stepping. */
+
+/* In non-stop debugging mode, we must take special care to manage
+ breakpoints properly; in particular, the traditional strategy for
+ stepping a thread past a breakpoint it has hit is unsuitable.
+ 'Displaced stepping' is a tactic for stepping one thread past a
+ breakpoint it has hit while ensuring that other threads running
+ concurrently will hit the breakpoint as they should.
+
+ The traditional way to step a thread T off a breakpoint in a
+ multi-threaded program in all-stop mode is as follows:
+
+ a0) Initially, all threads are stopped, and breakpoints are not
+ inserted.
+ a1) We single-step T, leaving breakpoints uninserted.
+ a2) We insert breakpoints, and resume all threads.
+
+ In non-stop debugging, however, this strategy is unsuitable: we
+ don't want to have to stop all threads in the system in order to
+ continue or step T past a breakpoint. Instead, we use displaced
+ stepping:
+
+ n0) Initially, T is stopped, other threads are running, and
+ breakpoints are inserted.
+ n1) We copy the instruction "under" the breakpoint to a separate
+ location, outside the main code stream, making any adjustments
+ to the instruction, register, and memory state as directed by
+ T's architecture.
+ n2) We single-step T over the instruction at its new location.
+ n3) We adjust the resulting register and memory state as directed
+ by T's architecture. This includes resetting T's PC to point
+ back into the main instruction stream.
+ n4) We resume T.
+
+ This approach depends on the following gdbarch methods:
+
+ - gdbarch_max_insn_length and gdbarch_displaced_step_location
+ indicate where to copy the instruction, and how much space must
+ be reserved there. We use these in step n1.
+
+ - gdbarch_displaced_step_copy_insn copies a instruction to a new
+ address, and makes any necessary adjustments to the instruction,
+ register contents, and memory. We use this in step n1.
+
+ - gdbarch_displaced_step_fixup adjusts registers and memory after
+ we have successfuly single-stepped the instruction, to yield the
+ same effect the instruction would have had if we had executed it
+ at its original address. We use this in step n3.
+
+ - gdbarch_displaced_step_free_closure provides cleanup.
+
+ The gdbarch_displaced_step_copy_insn and
+ gdbarch_displaced_step_fixup functions must be written so that
+ copying an instruction with gdbarch_displaced_step_copy_insn,
+ single-stepping across the copied instruction, and then applying
+ gdbarch_displaced_insn_fixup should have the same effects on the
+ thread's memory and registers as stepping the instruction in place
+ would have. Exactly which responsibilities fall to the copy and
+ which fall to the fixup is up to the author of those functions.
+
+ See the comments in gdbarch.sh for details.
+
+ Note that displaced stepping and software single-step cannot
+ currently be used in combination, although with some care I think
+ they could be made to. Software single-step works by placing
+ breakpoints on all possible subsequent instructions; if the
+ displaced instruction is a PC-relative jump, those breakpoints
+ could fall in very strange places --- on pages that aren't
+ executable, or at addresses that are not proper instruction
+ boundaries. (We do generally let other threads run while we wait
+ to hit the software single-step breakpoint, and they might
+ encounter such a corrupted instruction.) One way to work around
+ this would be to have gdbarch_displaced_step_copy_insn fully
+ simulate the effect of PC-relative instructions (and return NULL)
+ on architectures that use software single-stepping.
+
+ In non-stop mode, we can have independent and simultaneous step
+ requests, so more than one thread may need to simultaneously step
+ over a breakpoint. The current implementation assumes there is
+ only one scratch space per process. In this case, we have to
+ serialize access to the scratch space. If thread A wants to step
+ over a breakpoint, but we are currently waiting for some other
+ thread to complete a displaced step, we leave thread A stopped and
+ place it in the displaced_step_request_queue. Whenever a displaced
+ step finishes, we pick the next thread in the queue and start a new
+ displaced step operation on it. See displaced_step_prepare and
+ displaced_step_fixup for details. */
+
+/* If this is not null_ptid, this is the thread carrying out a
+ displaced single-step. This thread's state will require fixing up
+ once it has completed its step. */
+static ptid_t displaced_step_ptid;
+
+struct displaced_step_request
+{
+ ptid_t ptid;
+ struct displaced_step_request *next;
+};
+
+/* A queue of pending displaced stepping requests. */
+struct displaced_step_request *displaced_step_request_queue;
+
+/* The architecture the thread had when we stepped it. */
+static struct gdbarch *displaced_step_gdbarch;
+
+/* The closure provided gdbarch_displaced_step_copy_insn, to be used
+ for post-step cleanup. */
+static struct displaced_step_closure *displaced_step_closure;
+
+/* The address of the original instruction, and the copy we made. */
+static CORE_ADDR displaced_step_original, displaced_step_copy;
+
+/* Saved contents of copy area. */
+static gdb_byte *displaced_step_saved_copy;
+
+/* When this is non-zero, we are allowed to use displaced stepping, if
+ the architecture supports it. When this is zero, we use
+ traditional the hold-and-step approach. */
+int can_use_displaced_stepping = 1;
+static void
+show_can_use_displaced_stepping (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c,
+ const char *value)
+{
+ fprintf_filtered (file, _("\
+Debugger's willingness to use displaced stepping to step over "
+"breakpoints is %s.\n"), value);
+}
+
+/* Return non-zero if displaced stepping is enabled, and can be used
+ with GDBARCH. */
+static int
+use_displaced_stepping (struct gdbarch *gdbarch)
+{
+ return (can_use_displaced_stepping
+ && gdbarch_displaced_step_copy_insn_p (gdbarch));
+}
+
+/* Clean out any stray displaced stepping state. */
+static void
+displaced_step_clear (void)
+{
+ /* Indicate that there is no cleanup pending. */
+ displaced_step_ptid = null_ptid;
+
+ if (displaced_step_closure)
+ {
+ gdbarch_displaced_step_free_closure (displaced_step_gdbarch,
+ displaced_step_closure);
+ displaced_step_closure = NULL;
+ }
+}
+
+static void
+cleanup_displaced_step_closure (void *ptr)
+{
+ struct displaced_step_closure *closure = ptr;
+
+ gdbarch_displaced_step_free_closure (current_gdbarch, closure);
+}
+
+/* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
+void
+displaced_step_dump_bytes (struct ui_file *file,
+ const gdb_byte *buf,
+ size_t len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ fprintf_unfiltered (file, "%02x ", buf[i]);
+ fputs_unfiltered ("\n", file);
+}
+
+/* Prepare to single-step, using displaced stepping.
+
+ Note that we cannot use displaced stepping when we have a signal to
+ deliver. If we have a signal to deliver and an instruction to step
+ over, then after the step, there will be no indication from the
+ target whether the thread entered a signal handler or ignored the
+ signal and stepped over the instruction successfully --- both cases
+ result in a simple SIGTRAP. In the first case we mustn't do a
+ fixup, and in the second case we must --- but we can't tell which.
+ Comments in the code for 'random signals' in handle_inferior_event
+ explain how we handle this case instead.
+
+ Returns 1 if preparing was successful -- this thread is going to be
+ stepped now; or 0 if displaced stepping this thread got queued. */
+static int
+displaced_step_prepare (ptid_t ptid)
+{
+ struct cleanup *old_cleanups;
+ struct regcache *regcache = get_thread_regcache (ptid);
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ CORE_ADDR original, copy;
+ ULONGEST len;
+ struct displaced_step_closure *closure;
+
+ /* We should never reach this function if the architecture does not
+ support displaced stepping. */
+ gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch));
+
+ /* For the first cut, we're displaced stepping one thread at a
+ time. */
+
+ if (!ptid_equal (displaced_step_ptid, null_ptid))
+ {
+ /* Already waiting for a displaced step to finish. Defer this
+ request and place in queue. */
+ struct displaced_step_request *req, *new_req;
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: defering step of %s\n",
+ target_pid_to_str (ptid));
+
+ new_req = xmalloc (sizeof (*new_req));
+ new_req->ptid = ptid;
+ new_req->next = NULL;
+
+ if (displaced_step_request_queue)
+ {
+ for (req = displaced_step_request_queue;
+ req && req->next;
+ req = req->next)
+ ;
+ req->next = new_req;
+ }
+ else
+ displaced_step_request_queue = new_req;
+
+ return 0;
+ }
+ else
+ {
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: stepping %s now\n",
+ target_pid_to_str (ptid));
+ }
+
+ displaced_step_clear ();
+
+ original = regcache_read_pc (regcache);
+
+ copy = gdbarch_displaced_step_location (gdbarch);
+ len = gdbarch_max_insn_length (gdbarch);
+
+ /* Save the original contents of the copy area. */
+ displaced_step_saved_copy = xmalloc (len);
+ old_cleanups = make_cleanup (free_current_contents,
+ &displaced_step_saved_copy);
+ read_memory (copy, displaced_step_saved_copy, len);
+ if (debug_displaced)
+ {
+ fprintf_unfiltered (gdb_stdlog, "displaced: saved 0x%s: ",
+ paddr_nz (copy));
+ displaced_step_dump_bytes (gdb_stdlog, displaced_step_saved_copy, len);
+ };
+
+ closure = gdbarch_displaced_step_copy_insn (gdbarch,
+ original, copy, regcache);
+
+ /* We don't support the fully-simulated case at present. */
+ gdb_assert (closure);
+
+ make_cleanup (cleanup_displaced_step_closure, closure);
+
+ /* Resume execution at the copy. */
+ regcache_write_pc (regcache, copy);
+
+ discard_cleanups (old_cleanups);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to 0x%s\n",
+ paddr_nz (copy));
+
+ /* Save the information we need to fix things up if the step
+ succeeds. */
+ displaced_step_ptid = ptid;
+ displaced_step_gdbarch = gdbarch;
+ displaced_step_closure = closure;
+ displaced_step_original = original;
+ displaced_step_copy = copy;
+ return 1;
+}
+
+static void
+displaced_step_clear_cleanup (void *ignore)
+{
+ displaced_step_clear ();
+}
+
+static void
+write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, const gdb_byte *myaddr, int len)
+{
+ struct cleanup *ptid_cleanup = save_inferior_ptid ();
+ inferior_ptid = ptid;
+ write_memory (memaddr, myaddr, len);
+ do_cleanups (ptid_cleanup);
+}
+
+static void
+displaced_step_fixup (ptid_t event_ptid, enum target_signal signal)
+{
+ struct cleanup *old_cleanups;
+
+ /* Was this event for the pid we displaced? */
+ if (ptid_equal (displaced_step_ptid, null_ptid)
+ || ! ptid_equal (displaced_step_ptid, event_ptid))
+ return;
+
+ old_cleanups = make_cleanup (displaced_step_clear_cleanup, 0);
+
+ /* Restore the contents of the copy area. */
+ {
+ ULONGEST len = gdbarch_max_insn_length (displaced_step_gdbarch);
+ write_memory_ptid (displaced_step_ptid, displaced_step_copy,
+ displaced_step_saved_copy, len);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: restored 0x%s\n",
+ paddr_nz (displaced_step_copy));
+ }
+
+ /* Did the instruction complete successfully? */
+ if (signal == TARGET_SIGNAL_TRAP)
+ {
+ /* Fix up the resulting state. */
+ gdbarch_displaced_step_fixup (displaced_step_gdbarch,
+ displaced_step_closure,
+ displaced_step_original,
+ displaced_step_copy,
+ get_thread_regcache (displaced_step_ptid));
+ }
+ else
+ {
+ /* Since the instruction didn't complete, all we can do is
+ relocate the PC. */
+ struct regcache *regcache = get_thread_regcache (event_ptid);
+ CORE_ADDR pc = regcache_read_pc (regcache);
+ pc = displaced_step_original + (pc - displaced_step_copy);
+ regcache_write_pc (regcache, pc);
+ }
+
+ do_cleanups (old_cleanups);
+
+ /* Are there any pending displaced stepping requests? If so, run
+ one now. */
+ if (displaced_step_request_queue)
+ {
+ struct displaced_step_request *head;
+ ptid_t ptid;
+
+ head = displaced_step_request_queue;
+ ptid = head->ptid;
+ displaced_step_request_queue = head->next;
+ xfree (head);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: stepping queued %s now\n",
+ target_pid_to_str (ptid));
+
+
+ displaced_step_ptid = null_ptid;
+ displaced_step_prepare (ptid);
+ target_resume (ptid, 1, TARGET_SIGNAL_0);
+ }
+}
+
+\f
+/* Resuming. */
/* Things to clean up if we QUIT out of resume (). */
static void
{
int should_resume = 1;
struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
+ struct regcache *regcache = get_current_regcache ();
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ CORE_ADDR pc = regcache_read_pc (regcache);
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! */
-
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: resume (step=%d, signal=%d), "
+ "stepping_over_breakpoint=%d\n",
+ step, sig, stepping_over_breakpoint);
/* Some targets (e.g. Solaris x86) have a kernel bug when stepping
over an instruction that causes a page fault without triggering
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)
+ if (breakpoint_here_p (pc) == permanent_breakpoint_here)
{
- if (gdbarch_skip_permanent_breakpoint_p (current_gdbarch))
- gdbarch_skip_permanent_breakpoint (current_gdbarch,
- get_current_regcache ());
+ if (gdbarch_skip_permanent_breakpoint_p (gdbarch))
+ gdbarch_skip_permanent_breakpoint (gdbarch, regcache);
else
error (_("\
The program is stopped at a permanent breakpoint, but GDB does not know\n\
a command like `return' or `jump' to continue execution."));
}
- if (step && gdbarch_software_single_step_p (current_gdbarch))
+ /* If enabled, step over breakpoints by executing a copy of the
+ instruction at a different address.
+
+ We can't use displaced stepping when we have a signal to deliver;
+ the comments for displaced_step_prepare explain why. The
+ comments in the handle_inferior event for dealing with 'random
+ signals' explain what we do instead. */
+ if (use_displaced_stepping (gdbarch)
+ && stepping_over_breakpoint
+ && sig == TARGET_SIGNAL_0)
+ {
+ if (!displaced_step_prepare (inferior_ptid))
+ /* Got placed in displaced stepping queue. Will be resumed
+ later when all the currently queued displaced stepping
+ requests finish. */
+ return;
+ }
+
+ if (step && gdbarch_software_single_step_p (gdbarch))
{
/* Do it the hard way, w/temp breakpoints */
- if (gdbarch_software_single_step (current_gdbarch, get_current_frame ()))
+ if (gdbarch_software_single_step (gdbarch, get_current_frame ()))
{
/* ...and don't ask hardware to do it. */
step = 0;
`wait_for_inferior' */
singlestep_breakpoints_inserted_p = 1;
singlestep_ptid = inferior_ptid;
- singlestep_pc = read_pc ();
+ singlestep_pc = pc;
}
}
}
if ((step || singlestep_breakpoints_inserted_p)
- && breakpoint_here_p (read_pc ())
- && !breakpoint_inserted_here_p (read_pc ()))
+ && stepping_over_breakpoint)
{
- /* We're stepping, have breakpoint at PC, and it's
- not inserted. Most likely, proceed has noticed that
- we have breakpoint and tries to single-step over it,
- so that it's not hit. In which case, we need to
- single-step only this thread, and keep others stopped,
- as they can miss this breakpoint if allowed to run.
-
- The current code either has all breakpoints inserted,
- or all removed, so if we let other threads run,
- we can actually miss any breakpoint, not the one at PC. */
+ /* We're allowing a thread to run past a breakpoint it has
+ hit, by single-stepping the thread with the breakpoint
+ removed. In which case, we need to single-step only this
+ thread, and keep others stopped, as they can miss this
+ breakpoint if allowed to run.
+
+ The current code actually removes all breakpoints when
+ doing this, not just the one being stepped over, so if we
+ let other threads run, we can actually miss any
+ breakpoint, not just the one at PC. */
resume_ptid = inferior_ptid;
}
resume_ptid = inferior_ptid;
}
- if (gdbarch_cannot_step_breakpoint (current_gdbarch))
+ if (gdbarch_cannot_step_breakpoint (gdbarch))
{
/* 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 (read_pc ()))
+ if (step && breakpoint_inserted_here_p (pc))
step = 0;
}
+
+ if (debug_displaced
+ && use_displaced_stepping (gdbarch)
+ && stepping_over_breakpoint)
+ {
+ struct regcache *resume_regcache = get_thread_regcache (resume_ptid);
+ CORE_ADDR actual_pc = regcache_read_pc (resume_regcache);
+ gdb_byte buf[4];
+
+ fprintf_unfiltered (gdb_stdlog, "displaced: run 0x%s: ",
+ paddr_nz (actual_pc));
+ read_memory (actual_pc, buf, sizeof (buf));
+ displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf));
+ }
+
target_resume (resume_ptid, step, sig);
}
discard_cleanups (old_cleanups);
}
\f
+/* Proceeding. */
/* Clear out all variables saying what to do when inferior is continued.
First do this, then set the ones you want, then call `proceed'. */
/* Switched over from WAIT_PID. */
if (!ptid_equal (wait_ptid, minus_one_ptid)
- && !ptid_equal (inferior_ptid, wait_ptid)
- && breakpoint_here_p (read_pc_pid (wait_ptid)))
+ && !ptid_equal (inferior_ptid, wait_ptid))
{
- /* If stepping, remember current thread to switch back to. */
- if (step)
+ struct regcache *regcache = get_thread_regcache (wait_ptid);
+
+ if (breakpoint_here_p (regcache_read_pc (regcache)))
{
- deferred_step_ptid = inferior_ptid;
- }
+ /* If stepping, remember current thread to switch back to. */
+ if (step)
+ deferred_step_ptid = inferior_ptid;
- /* Switch back to WAIT_PID thread. */
- switch_to_thread (wait_ptid);
+ /* Switch back to WAIT_PID thread. */
+ switch_to_thread (wait_ptid);
- /* 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. */
- return 1;
+ /* 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. */
+ return 1;
+ }
}
return 0;
void
proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
{
+ struct regcache *regcache = get_current_regcache ();
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ CORE_ADDR pc = regcache_read_pc (regcache);
int oneproc = 0;
if (step > 0)
- step_start_function = find_pc_function (read_pc ());
+ step_start_function = find_pc_function (pc);
if (step < 0)
stop_after_trap = 1;
if (addr == (CORE_ADDR) -1)
{
- if (read_pc () == stop_pc && breakpoint_here_p (read_pc ()))
+ if (pc == stop_pc && breakpoint_here_p (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 ()))
+ 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. */
oneproc = 1;
}
else
{
- write_pc (addr);
+ regcache_write_pc (regcache, addr);
}
if (debug_infrun)
oneproc = 1;
if (oneproc)
- /* We will get a trace trap after one instruction.
- Continue it automatically and insert breakpoints then. */
- stepping_over_breakpoint = 1;
- else
+ {
+ stepping_over_breakpoint = 1;
+ /* If displaced stepping is enabled, we can step over the
+ breakpoint without hitting it, so leave all breakpoints
+ inserted. Otherwise we need to disable all breakpoints, step
+ one instruction, and then re-add them when that step is
+ finished. */
+ if (!use_displaced_stepping (gdbarch))
+ remove_breakpoints ();
+ }
+
+ /* We can insert breakpoints if we're not trying to step over one,
+ or if we are stepping over one but we're using displaced stepping
+ to do so. */
+ if (! stepping_over_breakpoint || use_displaced_stepping (gdbarch))
insert_breakpoints ();
if (siggnal != TARGET_SIGNAL_DEFAULT)
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 ()
+ are not guaranteed the inferior is stopped and so the regcache_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 ();
+ prev_pc = regcache_read_pc (get_current_regcache ());
/* Resume inferior. */
resume (oneproc || step || bpstat_should_step (), stop_signal);
does not support asynchronous execution. */
if (!target_can_async_p ())
{
- wait_for_inferior ();
+ wait_for_inferior (0);
normal_stop ();
}
}
void
start_remote (int from_tty)
{
- init_thread_list ();
init_wait_for_inferior ();
stop_soon = STOP_QUIETLY_REMOTE;
stepping_over_breakpoint = 0;
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 ();
+ wait_for_inferior (0);
/* Now that the inferior has stopped, do any bookkeeping like
loading shared libraries. We want to do this before normal_stop,
stepping_past_singlestep_breakpoint = 0;
deferred_step_ptid = null_ptid;
+
+ target_last_wait_ptid = minus_one_ptid;
+
+ init_thread_stepping_state (tss);
+ previous_inferior_ptid = null_ptid;
+ init_infwait_state ();
+
+ displaced_step_clear ();
}
+
\f
/* 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
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. */
+/* The PTID we'll do a target_wait on.*/
+ptid_t waiton_ptid;
+/* Current inferior wait state. */
+enum infwait_states infwait_state;
+
+/* Data to be passed around while handling an event. This data is
+ discarded between events. */
struct execution_control_state
{
+ ptid_t ptid;
struct target_waitstatus ws;
- struct target_waitstatus *wp;
- /* Should we step over breakpoint next time keep_going
- is called? */
- int stepping_over_breakpoint;
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;
};
static void insert_step_resume_breakpoint_at_caller (struct frame_info *);
static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal,
struct frame_id sr_id);
+static void insert_longjmp_resume_breakpoint (CORE_ADDR);
+
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);
int stop_info);
/* Wait for control to return from inferior to debugger.
+
+ If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
+ as if they were SIGTRAP signals. This can be useful during
+ the startup sequence on some targets such as HP/UX, where
+ we receive an EXEC event instead of the expected SIGTRAP.
+
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)
+wait_for_inferior (int treat_exec_as_sigtrap)
{
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");
+ fprintf_unfiltered
+ (gdb_stdlog, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
+ treat_exec_as_sigtrap);
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;
+ memset (ecs, 0, sizeof (*ecs));
+
+ /* Fill in with reasonable starting values. */
+ init_thread_stepping_state (tss);
- /* Fill in with reasonable starting values. */
- init_execution_control_state (ecs);
+ /* Reset to normal state. */
+ init_infwait_state ();
/* We'll update this if & when we switch to a new thread. */
previous_inferior_ptid = inferior_ptid;
while (1)
{
if (deprecated_target_wait_hook)
- ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp);
+ ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws);
else
- ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp);
+ ecs->ptid = target_wait (waiton_ptid, &ecs->ws);
+
+ if (treat_exec_as_sigtrap && ecs->ws.kind == TARGET_WAITKIND_EXECD)
+ {
+ xfree (ecs->ws.value.execd_pathname);
+ ecs->ws.kind = TARGET_WAITKIND_STOPPED;
+ ecs->ws.value.sig = TARGET_SIGNAL_TRAP;
+ }
/* Now figure out what to do with the result of the result. */
handle_inferior_event (ecs);
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;
+ to keep the state in a global variable 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. */
void
fetch_inferior_event (void *client_data)
{
- static struct cleanup *old_cleanups;
+ struct execution_control_state ecss;
+ struct execution_control_state *ecs = &ecss;
- async_ecs = &async_ecss;
+ memset (ecs, 0, sizeof (*ecs));
- if (!async_ecs->wait_some_more)
+ if (!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);
+ init_thread_stepping_state (tcs);
+
+ init_infwait_state ();
/* We'll update this if & when we switch to a new thread. */
previous_inferior_ptid = inferior_ptid;
}
if (deprecated_target_wait_hook)
- async_ecs->ptid =
- deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp);
+ ecs->ptid =
+ deprecated_target_wait_hook (waiton_ptid, &ecs->ws);
else
- async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp);
+ ecs->ptid = target_wait (waiton_ptid, &ecs->ws);
/* Now figure out what to do with the result of the result. */
- handle_inferior_event (async_ecs);
+ handle_inferior_event (ecs);
- if (!async_ecs->wait_some_more)
+ if (!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);
+ delete_step_resume_breakpoint (&step_resume_breakpoint);
+
normal_stop ();
if (step_multi && stop_step)
inferior_event_handler (INF_EXEC_CONTINUE, NULL);
void
init_execution_control_state (struct execution_control_state *ecs)
{
- ecs->stepping_over_breakpoint = 0;
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);
+}
+
+/* Clear context switchable stepping state. */
+
+void
+init_thread_stepping_state (struct thread_stepping_state *tss)
+{
+ tss->stepping_over_breakpoint = 0;
+ tss->step_after_step_resume_breakpoint = 0;
+ tss->stepping_through_solib_after_catch = 0;
+ tss->stepping_through_solib_catchpoints = NULL;
+ tss->sal = find_pc_line (prev_pc, 0);
+ tss->current_line = tss->sal.line;
+ tss->current_symtab = tss->sal.symtab;
}
/* Return the cached copy of the last pid/waitstatus returned by
/* Switch thread contexts, maintaining "infrun state". */
static void
-context_switch (struct execution_control_state *ecs)
+context_switch (ptid_t ptid)
{
/* 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
fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ",
target_pid_to_str (inferior_ptid));
fprintf_unfiltered (gdb_stdlog, "to %s\n",
- target_pid_to_str (ecs->ptid));
+ target_pid_to_str (ptid));
}
- if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid))
+ if (in_thread_list (inferior_ptid) && in_thread_list (ptid))
{ /* Perform infrun state context switch: */
/* Save infrun state for the old thread. */
save_infrun_state (inferior_ptid, prev_pc,
stepping_over_breakpoint, step_resume_breakpoint,
step_range_start,
step_range_end, &step_frame_id,
- ecs->handling_longjmp, ecs->stepping_over_breakpoint,
- ecs->stepping_through_solib_after_catch,
- ecs->stepping_through_solib_catchpoints,
- ecs->current_line, ecs->current_symtab);
+ tss->stepping_over_breakpoint,
+ tss->stepping_through_solib_after_catch,
+ tss->stepping_through_solib_catchpoints,
+ tss->current_line, tss->current_symtab,
+ cmd_continuation, intermediate_continuation,
+ proceed_to_finish,
+ step_over_calls,
+ stop_step,
+ step_multi,
+ stop_signal,
+ stop_bpstat);
/* Load infrun state for the new thread. */
- load_infrun_state (ecs->ptid, &prev_pc,
+ load_infrun_state (ptid, &prev_pc,
&stepping_over_breakpoint, &step_resume_breakpoint,
&step_range_start,
&step_range_end, &step_frame_id,
- &ecs->handling_longjmp, &ecs->stepping_over_breakpoint,
- &ecs->stepping_through_solib_after_catch,
- &ecs->stepping_through_solib_catchpoints,
- &ecs->current_line, &ecs->current_symtab);
+ &tss->stepping_over_breakpoint,
+ &tss->stepping_through_solib_after_catch,
+ &tss->stepping_through_solib_catchpoints,
+ &tss->current_line, &tss->current_symtab,
+ &cmd_continuation, &intermediate_continuation,
+ &proceed_to_finish,
+ &step_over_calls,
+ &stop_step,
+ &step_multi,
+ &stop_signal,
+ &stop_bpstat);
}
- switch_to_thread (ecs->ptid);
+ switch_to_thread (ptid);
+}
+
+/* Context switch to thread PTID. */
+ptid_t
+context_switch_to (ptid_t ptid)
+{
+ ptid_t current_ptid = inferior_ptid;
+
+ /* Context switch to the new thread. */
+ if (!ptid_equal (ptid, inferior_ptid))
+ {
+ context_switch (ptid);
+ }
+ return current_ptid;
}
static void
adjust_pc_after_break (struct execution_control_state *ecs)
{
+ struct regcache *regcache = get_thread_regcache (ecs->ptid);
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
CORE_ADDR breakpoint_pc;
/* If this target does not decrement the PC after breakpoints, then
we have nothing to do. */
- if (gdbarch_decr_pc_after_break (current_gdbarch) == 0)
+ if (gdbarch_decr_pc_after_break (gdbarch) == 0)
return;
/* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
/* Find the location where (if we've hit a breakpoint) the
breakpoint would be. */
- breakpoint_pc = read_pc_pid (ecs->ptid) - gdbarch_decr_pc_after_break
- (current_gdbarch);
+ breakpoint_pc = regcache_read_pc (regcache)
+ - gdbarch_decr_pc_after_break (gdbarch);
/* Check whether there actually is a software breakpoint inserted
at that location. */
if (singlestep_breakpoints_inserted_p
|| !ptid_equal (ecs->ptid, inferior_ptid)
- || !currently_stepping (ecs)
+ || !currently_stepping (tss)
|| prev_pc == breakpoint_pc)
- write_pc_pid (breakpoint_pc, ecs->ptid);
+ regcache_write_pc (regcache, breakpoint_pc);
}
}
+void
+init_infwait_state (void)
+{
+ waiton_ptid = pid_to_ptid (-1);
+ infwait_state = infwait_normal_state;
+}
+
/* 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 stopped_by_watchpoint;
int stepped_after_stopped_by_watchpoint = 0;
+ breakpoint_retire_moribund ();
+
/* Cache the last pid/waitstatus. */
target_last_wait_ptid = ecs->ptid;
- target_last_waitstatus = *ecs->wp;
+ target_last_waitstatus = ecs->ws;
+
+ /* Always clear state belonging to the previous time we stopped. */
+ stop_stack_dummy = 0;
adjust_pc_after_break (ecs);
- switch (ecs->infwait_state)
+ 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. */
- ecs->waiton_ptid = pid_to_ptid (-1);
+ waiton_ptid = pid_to_ptid (-1);
break;
case infwait_normal_state:
default:
internal_error (__FILE__, __LINE__, _("bad switch"));
}
- ecs->infwait_state = infwait_normal_state;
+ infwait_state = infwait_normal_state;
reinit_frame_cache ();
if (ecs->ws.kind != TARGET_WAITKIND_EXITED
&& ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event)
- {
- add_thread (ecs->ptid);
+ 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");
- }
+ /* Mark all threads as not-executing. In non-stop, this should be
+ adjusted to only mark ecs->ptid. */
+ if (ecs->ws.kind != TARGET_WAITKIND_IGNORE)
+ set_executing (pid_to_ptid (-1), 0);
switch (ecs->ws.kind)
{
established. */
if (stop_soon == NO_STOP_QUIETLY)
{
- /* Remove breakpoints, SOLIB_ADD might adjust
- breakpoint addresses via breakpoint_re_set. */
- 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
/* NOTE drow/2007-05-11: This might be a good place to check
for "catch load". */
-
- /* Reinsert breakpoints and continue. */
- insert_breakpoints ();
}
/* If we are skipping through a shell, or through shared library
we're attaching or setting up a remote connection. */
if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY)
{
+ /* Loading of shared libraries might have changed breakpoint
+ addresses. Make sure new breakpoints are inserted. */
+ if (stop_soon == NO_STOP_QUIETLY
+ && !breakpoints_always_inserted_mode ())
+ insert_breakpoints ();
resume (0, TARGET_SIGNAL_0);
prepare_to_wait (ecs);
return;
stop_signal = TARGET_SIGNAL_TRAP;
pending_follow.kind = ecs->ws.kind;
- pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
+ pending_follow.fork_event.parent_pid = ecs->ptid;
pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
if (!ptid_equal (ecs->ptid, inferior_ptid))
{
- context_switch (ecs);
+ context_switch (ecs->ptid);
reinit_frame_cache ();
}
fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\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--;
- 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);
+ follow_exec (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_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
- stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
+ {
+ /* The breakpoints module may need to touch the inferior's
+ memory. Switch to the (stopped) event ptid
+ momentarily. */
+ ptid_t saved_inferior_ptid = inferior_ptid;
+ inferior_ptid = ecs->ptid;
- ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
- inferior_ptid = ecs->saved_inferior_ptid;
+ stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid);
+
+ ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
+ inferior_ptid = saved_inferior_ptid;
+ }
if (!ptid_equal (ecs->ptid, inferior_ptid))
{
- context_switch (ecs);
+ context_switch (ecs->ptid);
reinit_frame_cache ();
}
return;
}
- stop_pc = read_pc_pid (ecs->ptid);
+ /* Do we need to clean up the state of a thread that has completed a
+ displaced single-step? (Doing so usually affects the PC, so do
+ it here, before we set stop_pc.) */
+ displaced_step_fixup (ecs->ptid, stop_signal);
+
+ stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc));
+ {
+ fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n",
+ paddr_nz (stop_pc));
+ if (STOPPED_BY_WATCHPOINT (&ecs->ws))
+ {
+ CORE_ADDR addr;
+ fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n");
+
+ if (target_stopped_data_address (¤t_target, &addr))
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: stopped data address = 0x%s\n",
+ paddr_nz (addr));
+ else
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: (no data address available)\n");
+ }
+ }
if (stepping_past_singlestep_breakpoint)
{
ecs->random_signal = 0;
- ecs->ptid = saved_singlestep_ptid;
- context_switch (ecs);
+ context_switch (saved_singlestep_ptid);
if (deprecated_context_hook)
deprecated_context_hook (pid_to_thread_id (ecs->ptid));
when they stop, or to re-poll the remote looking for
this particular thread (i.e. temporarily enable
schedlock). */
- if (read_pc_pid (singlestep_ptid) != singlestep_pc)
+
+ CORE_ADDR new_singlestep_pc
+ = regcache_read_pc (get_thread_regcache (singlestep_ptid));
+
+ if (new_singlestep_pc != singlestep_pc)
{
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread,"
the context we want to use. Just fudge our
state and continue. */
ecs->ptid = singlestep_ptid;
- stop_pc = read_pc_pid (ecs->ptid);
+ stop_pc = new_singlestep_pc;
}
else
{
if (thread_hop_needed)
{
- int remove_status;
+ int remove_status = 0;
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n");
singlestep_breakpoints_inserted_p = 0;
}
- remove_status = remove_breakpoints ();
+ /* If the arch can displace step, don't remove the
+ breakpoints. */
+ if (!use_displaced_stepping (current_gdbarch))
+ 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
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;
- }
+ error (_("Cannot step over breakpoint hit in wrong thread"));
else
{ /* Single step */
if (!ptid_equal (inferior_ptid, ecs->ptid))
- context_switch (ecs);
- ecs->waiton_ptid = ecs->ptid;
- ecs->wp = &(ecs->ws);
- ecs->stepping_over_breakpoint = 1;
+ context_switch (ecs->ptid);
+
+ waiton_ptid = ecs->ptid;
+ infwait_state = infwait_thread_hop_state;
- ecs->infwait_state = infwait_thread_hop_state;
+ tss->stepping_over_breakpoint = 1;
keep_going (ecs);
registers_changed ();
return;
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n");
- context_switch (ecs);
+ context_switch (ecs->ptid);
if (deprecated_context_hook)
deprecated_context_hook (pid_to_thread_id (ecs->ptid));
&& (HAVE_STEPPABLE_WATCHPOINT
|| gdbarch_have_nonsteppable_watchpoint (current_gdbarch)))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n");
-
/* 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
remove_breakpoints ();
registers_changed ();
target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */
- ecs->waiton_ptid = ecs->ptid;
+ waiton_ptid = ecs->ptid;
if (HAVE_STEPPABLE_WATCHPOINT)
- ecs->infwait_state = infwait_step_watch_state;
+ infwait_state = infwait_step_watch_state;
else
- ecs->infwait_state = infwait_nonstep_watch_state;
+ infwait_state = infwait_nonstep_watch_state;
prepare_to_wait (ecs);
return;
}
&ecs->stop_func_start, &ecs->stop_func_end);
ecs->stop_func_start
+= gdbarch_deprecated_function_start_offset (current_gdbarch);
- ecs->stepping_over_breakpoint = 0;
+ tss->stepping_over_breakpoint = 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;
if (stop_signal == TARGET_SIGNAL_TRAP
&& stepping_over_breakpoint
&& gdbarch_single_step_through_delay_p (current_gdbarch)
- && currently_stepping (ecs))
+ && currently_stepping (tss))
{
- /* We're trying to step of a breakpoint. Turns out that we're
+ /* We're trying to step off 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 user issued a continue when stopped at a breakpoint.
Set up for another trap and get out of here. */
- ecs->stepping_over_breakpoint = 1;
+ tss->stepping_over_breakpoint = 1;
keep_going (ecs);
return;
}
case, don't decide that here, just set
ecs->stepping_over_breakpoint, making sure we
single-step again before breakpoints are re-inserted. */
- ecs->stepping_over_breakpoint = 1;
+ tss->stepping_over_breakpoint = 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->stepping_over_breakpoint to 1 to single step once)
+ 1) stop_stepping and return; to really stop and return to the debugger,
+ 2) keep_going and return to start up again
+ (set tss->stepping_over_breakpoint 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. */
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. */
+ stack.
+ If we're doing a displaced step past a breakpoint, then the
+ breakpoint is always inserted at the original instruction;
+ non-standard signals can't be explained by the breakpoint. */
if (stop_signal == TARGET_SIGNAL_TRAP
- || (breakpoint_inserted_here_p (stop_pc)
+ || (! stepping_over_breakpoint
+ && breakpoint_inserted_here_p (stop_pc)
&& (stop_signal == TARGET_SIGNAL_ILL
|| stop_signal == TARGET_SIGNAL_SEGV
|| stop_signal == TARGET_SIGNAL_EMT))
/* 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)
+ SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
+ See more comments in inferior.h. On the other hand, if we
+ get a non-SIGSTOP, report it to the user - assume the backend
+ will handle the SIGSTOP if it should show up later. */
+ if (stop_soon == STOP_QUIETLY_NO_SIGSTOP
+ && stop_signal == TARGET_SIGNAL_STOP)
{
stop_stepping (ecs);
- if (stop_signal == TARGET_SIGNAL_STOP)
- stop_signal = TARGET_SIGNAL_0;
+ stop_signal = TARGET_SIGNAL_0;
return;
}
target_terminal_ours_for_output ();
print_stop_reason (SIGNAL_RECEIVED, stop_signal);
}
- if (signal_stop[stop_signal])
+ if (signal_stop_state (stop_signal))
{
stop_stepping (ecs);
return;
stop_signal = TARGET_SIGNAL_0;
if (prev_pc == read_pc ()
- && breakpoint_here_p (read_pc ())
- && !breakpoint_inserted_here_p (read_pc ())
+ && stepping_over_breakpoint
&& 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
+ Instead 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. */
code paths as single-step - set a breakpoint at the
signal return address and then, once hit, step off that
breakpoint. */
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: signal arrived while stepping over "
+ "breakpoint\n");
insert_step_resume_breakpoint_at_frame (get_current_frame ());
- ecs->step_after_step_resume_breakpoint = 1;
+ tss->step_after_step_resume_breakpoint = 1;
keep_going (ecs);
return;
}
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. */
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: signal may take us out of "
+ "single-step range\n");
+
insert_step_resume_breakpoint_at_frame (get_current_frame ());
keep_going (ecs);
return;
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: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
- disable_longjmp_breakpoint ();
- remove_breakpoints ();
+ /* If we hit the breakpoint at longjmp while stepping, we
+ install a momentary breakpoint at the target of the
+ jmp_buf. */
+
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
+
+ tss->stepping_over_breakpoint = 1;
+
if (!gdbarch_get_longjmp_target_p (current_gdbarch)
|| !gdbarch_get_longjmp_target (current_gdbarch,
get_current_frame (), &jmp_buf_pc))
{
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "\
+infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
keep_going (ecs);
return;
}
- /* Need to blow away step-resume breakpoint, as it
- interferes with us */
+ /* We're going to replace the current step-resume breakpoint
+ with a longjmp-resume breakpoint. */
if (step_resume_breakpoint != NULL)
- {
- delete_step_resume_breakpoint (&step_resume_breakpoint);
- }
+ delete_step_resume_breakpoint (&step_resume_breakpoint);
+
+ /* Insert a breakpoint at resume address. */
+ insert_longjmp_resume_breakpoint (jmp_buf_pc);
- 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: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
- remove_breakpoints ();
- disable_longjmp_breakpoint ();
- ecs->handling_longjmp = 0; /* FIXME */
- if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
- break;
- /* else fallthrough */
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
+
+ gdb_assert (step_resume_breakpoint != NULL);
+ delete_step_resume_breakpoint (&step_resume_breakpoint);
+
+ stop_step = 1;
+ print_stop_reason (END_STEPPING_RANGE, 0);
+ stop_stepping (ecs);
+ return;
case BPSTAT_WHAT_SINGLE:
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n");
- remove_breakpoints ();
- ecs->stepping_over_breakpoint = 1;
+ tss->stepping_over_breakpoint = 1;
/* Still need to check other stuff, at least the case
where we are stepping and step out of the right range. */
break;
bpstat_find_step_resume_breakpoint (stop_bpstat);
}
delete_step_resume_breakpoint (&step_resume_breakpoint);
- if (ecs->step_after_step_resume_breakpoint)
+ if (tss->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 ();
- ecs->stepping_over_breakpoint = 1;
+ tss->step_after_step_resume_breakpoint = 0;
+ tss->stepping_over_breakpoint = 1;
keep_going (ecs);
return;
}
{
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_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. */
- remove_breakpoints ();
/* Check for any newly added shared libraries if we're
supposed to be adding them automatically. Switch
friends) until we reach non-dld code. At that point,
we can stop stepping. */
bpstat_get_triggered_catchpoints (stop_bpstat,
- &ecs->
+ &tss->
stepping_through_solib_catchpoints);
- ecs->stepping_through_solib_after_catch = 1;
+ tss->stepping_through_solib_after_catch = 1;
/* Be sure to lift all breakpoints, so the inferior does
actually step past this point... */
- ecs->stepping_over_breakpoint = 1;
+ tss->stepping_over_breakpoint = 1;
break;
}
else
{
/* We want to step over this breakpoint, then keep going. */
- ecs->stepping_over_breakpoint = 1;
+ tss->stepping_over_breakpoint = 1;
break;
}
}
/* 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 (tss->stepping_through_solib_after_catch)
{
#if defined(SOLIB_ADD)
/* Have we reached our destination? If not, keep going. */
{
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n");
- ecs->stepping_over_breakpoint = 1;
+ tss->stepping_over_breakpoint = 1;
keep_going (ecs);
return;
}
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;
+ tss->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_bpstat = bpstat_copy (tss->stepping_through_solib_catchpoints);
+ bpstat_clear (&tss->stepping_through_solib_catchpoints);
stop_print_frame = 1;
stop_stepping (ecs);
return;
}
}
- ecs->sal = find_pc_line (stop_pc, 0);
+ tss->sal = find_pc_line (stop_pc, 0);
/* 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
- && ecs->sal.line == 0)
+ && tss->sal.line == 0)
{
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n");
return;
}
- if (ecs->sal.line == 0)
+ if (tss->sal.line == 0)
{
/* We have no line number information. That means to stop
stepping (does this always happen right after one instruction,
return;
}
- if ((stop_pc == ecs->sal.pc)
- && (ecs->current_line != ecs->sal.line
- || ecs->current_symtab != ecs->sal.symtab))
+ if ((stop_pc == tss->sal.pc)
+ && (tss->current_line != tss->sal.line
+ || tss->current_symtab != tss->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.
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_range_start = tss->sal.pc;
+ step_range_end = tss->sal.end;
step_frame_id = get_frame_id (get_current_frame ());
- ecs->current_line = ecs->sal.line;
- ecs->current_symtab = ecs->sal.symtab;
+ tss->current_line = tss->sal.line;
+ tss->current_symtab = tss->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
/* Are we in the middle of stepping? */
static int
-currently_stepping (struct execution_control_state *ecs)
+currently_stepping (struct thread_stepping_state *tss)
{
- return ((!ecs->handling_longjmp
- && ((step_range_end && step_resume_breakpoint == NULL)
- || stepping_over_breakpoint))
- || ecs->stepping_through_solib_after_catch
+ return (((step_range_end && step_resume_breakpoint == NULL)
+ || stepping_over_breakpoint)
+ || tss->stepping_through_solib_after_catch
|| bpstat_should_step ());
}
ecs->stop_func_start = gdbarch_skip_prologue
(current_gdbarch, ecs->stop_func_start);
- ecs->sal = find_pc_line (ecs->stop_func_start, 0);
+ tss->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;
+ if (tss->sal.end
+ && tss->sal.pc != ecs->stop_func_start
+ && tss->sal.end < ecs->stop_func_end)
+ ecs->stop_func_start = tss->sal.end;
/* Architectures which require breakpoint adjustment might not be able
to place a breakpoint at the computed address. If so, the test
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
+ /* There should never be more than one step-resume or longjmp-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);
insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame));
}
+/* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
+ new breakpoint at the target of a jmp_buf. The handling of
+ longjmp-resume uses the same mechanisms used for handling
+ "step-resume" breakpoints. */
+
+static void
+insert_longjmp_resume_breakpoint (CORE_ADDR pc)
+{
+ /* There should never be more than one step-resume or longjmp-resume
+ breakpoint per thread, so we should never be setting a new
+ longjmp_resume_breakpoint when one is already active. */
+ gdb_assert (step_resume_breakpoint == NULL);
+
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
+ paddr_nz (pc));
+
+ step_resume_breakpoint =
+ set_momentary_breakpoint_at_pc (pc, bp_longjmp_resume);
+}
+
static void
stop_stepping (struct execution_control_state *ecs)
{
/* 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);
+ resume (currently_stepping (tss), stop_signal);
}
else
{
already inserted breakpoints. Therefore, we don't
care if breakpoints were already inserted, or not. */
- if (!ecs->stepping_over_breakpoint)
+ if (tss->stepping_over_breakpoint)
+ {
+ if (! use_displaced_stepping (current_gdbarch))
+ /* Since we can't do a displaced step, we have to remove
+ the breakpoint while we step it. To keep things
+ simple, we remove them all. */
+ remove_breakpoints ();
+ }
+ else
{
struct gdb_exception e;
/* Stop stepping when inserting breakpoints
}
}
- stepping_over_breakpoint = ecs->stepping_over_breakpoint;
+ stepping_over_breakpoint = tss->stepping_over_breakpoint;
/* Do not deliver SIGNAL_TRAP (except when the user explicitly
specifies that such a signal should be delivered to the
stop_signal = TARGET_SIGNAL_0;
- resume (currently_stepping (ecs), stop_signal);
+ resume (currently_stepping (tss), stop_signal);
}
prepare_to_wait (ecs);
{
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n");
- if (ecs->infwait_state == infwait_normal_state)
+ if (infwait_state == infwait_normal_state)
{
overlay_cache_invalid = 1;
as part of their normal status mechanism. */
registers_changed ();
- ecs->waiton_ptid = pid_to_ptid (-1);
- ecs->wp = &(ecs->ws);
+ 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
{
target_terminal_ours_for_output ();
printf_filtered (_("[Switching to %s]\n"),
- target_pid_or_tid_to_str (inferior_ptid));
+ target_pid_to_str (inferior_ptid));
+ annotate_thread_changed ();
previous_inferior_ptid = inferior_ptid;
}
gdbarch_decr_pc_after_break needs to just go away. */
deprecated_update_frame_pc_hack (get_current_frame (), read_pc ());
- if (target_has_execution)
+ if (!breakpoints_always_inserted_mode () && target_has_execution)
{
if (remove_breakpoints ())
{
}
}
- /* 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. */
bpstat_print() contains the logic deciding in detail
what to print, based on the event(s) that just occurred. */
- if (stop_print_frame)
+ /* If --batch-silent is enabled then there's no need to print the current
+ source location, and to try risks causing an error message about
+ missing source files. */
+ if (stop_print_frame && !batch_silent)
{
int bpstat_ret;
int source_flag;
done:
annotate_stopped ();
- observer_notify_normal_stop (stop_bpstat);
+ if (!suppress_stop_observer && !step_multi)
+ observer_notify_normal_stop (stop_bpstat);
+ /* 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);
+ set_running (pid_to_ptid (-1), 0);
}
static int
int
signal_stop_state (int signo)
{
- return signal_stop[signo];
+ /* Always stop on signals if we're just gaining control of the
+ program. */
+ return signal_stop[signo] || stop_soon != NO_STOP_QUIETLY;
}
int
}
int
-inferior_has_forked (int pid, int *child_pid)
+inferior_has_forked (ptid_t pid, ptid_t *child_pid)
{
struct target_waitstatus last;
ptid_t last_ptid;
if (last.kind != TARGET_WAITKIND_FORKED)
return 0;
- if (ptid_get_pid (last_ptid) != pid)
+ if (!ptid_equal (last_ptid, pid))
return 0;
*child_pid = last.value.related_pid;
}
int
-inferior_has_vforked (int pid, int *child_pid)
+inferior_has_vforked (ptid_t pid, ptid_t *child_pid)
{
struct target_waitstatus last;
ptid_t last_ptid;
if (last.kind != TARGET_WAITKIND_VFORKED)
return 0;
- if (ptid_get_pid (last_ptid) != pid)
+ if (!ptid_equal (last_ptid, pid))
return 0;
*child_pid = last.value.related_pid;
}
int
-inferior_has_execd (int pid, char **execd_pathname)
+inferior_has_execd (ptid_t pid, char **execd_pathname)
{
struct target_waitstatus last;
ptid_t last_ptid;
if (last.kind != TARGET_WAITKIND_EXECD)
return 0;
- if (ptid_get_pid (last_ptid) != pid)
+ if (!ptid_equal (last_ptid, pid))
return 0;
*execd_pathname = xstrdup (last.value.execd_pathname);
}
\f
+int non_stop = 0;
+static int non_stop_1 = 0;
+
+static void
+set_non_stop (char *args, int from_tty,
+ struct cmd_list_element *c)
+{
+ if (target_has_execution)
+ {
+ non_stop_1 = non_stop;
+ error (_("Cannot change this setting while the inferior is running."));
+ }
+
+ non_stop = non_stop_1;
+}
+
+static void
+show_non_stop (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file,
+ _("Controlling the inferior in non-stop mode is %s.\n"),
+ value);
+}
+
+
void
_initialize_infrun (void)
{
show_debug_infrun,
&setdebuglist, &showdebuglist);
+ add_setshow_boolean_cmd ("displaced", class_maintenance, &debug_displaced, _("\
+Set displaced stepping debugging."), _("\
+Show displaced stepping debugging."), _("\
+When non-zero, displaced stepping specific debugging is enabled."),
+ NULL,
+ show_debug_displaced,
+ &setdebuglist, &showdebuglist);
+
+ add_setshow_boolean_cmd ("non-stop", no_class,
+ &non_stop_1, _("\
+Set whether gdb controls the inferior in non-stop mode."), _("\
+Show whether gdb controls the inferior in non-stop mode."), _("\
+When debugging a multi-threaded program and this setting is\n\
+off (the default, also called all-stop mode), when one thread stops\n\
+(for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
+all other threads in the program while you interact with the thread of\n\
+interest. When you continue or step a thread, you can allow the other\n\
+threads to run, or have them remain stopped, but while you inspect any\n\
+thread's state, all threads stop.\n\
+\n\
+In non-stop mode, when one thread stops, other threads can continue\n\
+to run freely. You'll be able to step each thread independently,\n\
+leave it stopped or free to run as needed."),
+ set_non_stop,
+ show_non_stop,
+ &setlist,
+ &showlist);
+
numsigs = (int) TARGET_SIGNAL_LAST;
signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs);
signal_print = (unsigned char *)
show_step_stop_if_no_debug,
&setlist, &showlist);
+ add_setshow_boolean_cmd ("can-use-displaced-stepping", class_maintenance,
+ &can_use_displaced_stepping, _("\
+Set debugger's willingness to use displaced stepping."), _("\
+Show debugger's willingness to use displaced stepping."), _("\
+If zero, gdb will not use displaced stepping to step over\n\
+breakpoints, even if such is supported by the target."),
+ NULL,
+ show_can_use_displaced_stepping,
+ &maintenance_set_cmdlist,
+ &maintenance_show_cmdlist);
+
/* 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;
+ displaced_step_ptid = null_ptid;
}
projects / deliverable / binutils-gdb.git / blobdiff