/* Target-struct-independent code to start (run) and stop an inferior
process.
- Copyright (C) 1986-2019 Free Software Foundation, Inc.
+ Copyright (C) 1986-2020 Free Software Foundation, Inc.
+ Copyright (C) 2019-2020 Advanced Micro Devices, Inc. All rights reserved.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "displaced-stepping.h"
#include "infrun.h"
#include <ctype.h>
#include "symtab.h"
#include "frame.h"
#include "inferior.h"
#include "breakpoint.h"
-#include "common/gdb_wait.h"
#include "gdbcore.h"
#include "gdbcmd.h"
-#include "cli/cli-script.h"
#include "target.h"
#include "gdbthread.h"
#include "annotate.h"
#include "symfile.h"
#include "top.h"
-#include <signal.h>
#include "inf-loop.h"
#include "regcache.h"
+#include "utils.h"
#include "value.h"
#include "observable.h"
#include "language.h"
#include "solib.h"
#include "main.h"
-#include "dictionary.h"
#include "block.h"
#include "mi/mi-common.h"
#include "event-top.h"
#include "inline-frame.h"
#include "jit.h"
#include "tracepoint.h"
-#include "continuations.h"
-#include "interps.h"
#include "skip.h"
#include "probe.h"
#include "objfiles.h"
#include "solist.h"
#include "event-loop.h"
#include "thread-fsm.h"
-#include "common/enum-flags.h"
+#include "gdbsupport/enum-flags.h"
#include "progspace-and-thread.h"
-#include "common/gdb_optional.h"
+#include "gdbsupport/gdb_optional.h"
#include "arch-utils.h"
-#include "common/scope-exit.h"
+#include "gdbsupport/scope-exit.h"
+#include "gdbsupport/forward-scope-exit.h"
/* Prototypes for local functions */
/* When set, stop the 'step' command if we enter a function which has
no line number information. The normal behavior is that we step
over such function. */
-int step_stop_if_no_debug = 0;
+bool step_stop_if_no_debug = false;
static void
show_step_stop_if_no_debug (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
Exactly which branch is detached depends on 'set follow-fork-mode'
setting. */
-static int detach_fork = 1;
+static bool detach_fork = true;
-int debug_displaced = 0;
+bool debug_displaced = false;
static void
show_debug_displaced (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
/* Support for disabling address space randomization. */
-int disable_randomization = 1;
+bool disable_randomization = true;
static void
show_disable_randomization (struct ui_file *file, int from_tty,
/* User interface for non-stop mode. */
-int non_stop = 0;
-static int non_stop_1 = 0;
+bool non_stop = false;
+static bool non_stop_1 = false;
static void
set_non_stop (const char *args, int from_tty,
non-stop, in which all GDB operations that might affect the
target's execution have been disabled. */
-int observer_mode = 0;
-static int observer_mode_1 = 0;
+bool observer_mode = false;
+static bool observer_mode_1 = false;
static void
set_observer_mode (const char *args, int from_tty,
/* We can insert fast tracepoints in or out of observer mode,
but enable them if we're going into this mode. */
if (observer_mode)
- may_insert_fast_tracepoints = 1;
+ may_insert_fast_tracepoints = true;
may_stop = !observer_mode;
update_target_permissions ();
if (observer_mode)
{
pagination_enabled = 0;
- non_stop = non_stop_1 = 1;
+ non_stop = non_stop_1 = true;
}
if (from_tty)
void
update_observer_mode (void)
{
- int newval;
-
- newval = (!may_insert_breakpoints
- && !may_insert_tracepoints
- && may_insert_fast_tracepoints
- && !may_stop
- && non_stop);
+ bool newval = (!may_insert_breakpoints
+ && !may_insert_tracepoints
+ && may_insert_fast_tracepoints
+ && !may_stop
+ && non_stop);
/* Let the user know if things change. */
if (newval != observer_mode)
Can not resume the parent process over vfork in the foreground while\n\
holding the child stopped. Try \"set detach-on-fork\" or \
\"set schedule-multiple\".\n"));
- /* FIXME output string > 80 columns. */
return 1;
}
fprintf_filtered (gdb_stdlog,
_("[Detaching after %s from child %s]\n"),
has_vforked ? "vfork" : "fork",
- target_pid_to_str (process_ptid));
+ target_pid_to_str (process_ptid).c_str ());
}
}
else
fprintf_filtered (gdb_stdlog,
_("[Detaching after fork from "
"parent %s]\n"),
- target_pid_to_str (process_ptid));
+ target_pid_to_str (process_ptid).c_str ());
}
target_detach (parent_inf, 0);
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: resuming vfork parent thread %s\n",
- target_pid_to_str (thread->ptid));
+ target_pid_to_str (thread->ptid).c_str ());
switch_to_thread (thread);
clear_proceed_status (0);
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. */
+ between the parent and the child. Break the bonds. */
+ inferior *vfork_parent = inf->vfork_parent;
+ inf->vfork_parent->vfork_child = NULL;
+ inf->vfork_parent = NULL;
- if (inf->vfork_parent->pending_detach)
+ /* If the user wanted to detach from the parent, now is the
+ time. */
+ if (vfork_parent->pending_detach)
{
struct thread_info *tp;
struct program_space *pspace;
/* follow-fork child, detach-on-fork on. */
- inf->vfork_parent->pending_detach = 0;
+ vfork_parent->pending_detach = 0;
gdb::optional<scoped_restore_exited_inferior>
maybe_restore_inferior;
maybe_restore_thread.emplace ();
/* We're letting loose of the parent. */
- tp = any_live_thread_of_inferior (inf->vfork_parent);
+ tp = any_live_thread_of_inferior (vfork_parent);
switch_to_thread (tp);
/* We're about to detach from the parent, which implicitly
if (print_inferior_events)
{
- const char *pidstr
- = target_pid_to_str (ptid_t (inf->vfork_parent->pid));
+ std::string pidstr
+ = target_pid_to_str (ptid_t (vfork_parent->pid));
target_terminal::ours_for_output ();
{
fprintf_filtered (gdb_stdlog,
_("[Detaching vfork parent %s "
- "after child exec]\n"), pidstr);
+ "after child exec]\n"), pidstr.c_str ());
}
else
{
fprintf_filtered (gdb_stdlog,
_("[Detaching vfork parent %s "
- "after child exit]\n"), pidstr);
+ "after child exit]\n"), pidstr.c_str ());
}
}
- target_detach (inf->vfork_parent, 0);
+ target_detach (vfork_parent, 0);
/* Put it back. */
inf->pspace = pspace;
inf->removable = 1;
set_current_program_space (inf->pspace);
- resume_parent = inf->vfork_parent->pid;
-
- /* Break the bonds. */
- inf->vfork_parent->vfork_child = NULL;
+ resume_parent = vfork_parent->pid;
}
else
{
set_current_program_space (pspace);
inf->removable = 1;
inf->symfile_flags = SYMFILE_NO_READ;
- clone_program_space (pspace, inf->vfork_parent->pspace);
+ clone_program_space (pspace, vfork_parent->pspace);
inf->pspace = pspace;
inf->aspace = pspace->aspace;
- resume_parent = inf->vfork_parent->pid;
- /* Break the bonds. */
- inf->vfork_parent->vfork_child = NULL;
+ resume_parent = vfork_parent->pid;
}
- inf->vfork_parent = NULL;
-
gdb_assert (current_program_space == inf->pspace);
if (non_stop && resume_parent != -1)
/* EXEC_FILE_TARGET is assumed to be non-NULL. */
static void
-follow_exec (ptid_t ptid, char *exec_file_target)
+follow_exec (ptid_t ptid, const char *exec_file_target)
{
struct inferior *inf = current_inferior ();
int pid = ptid.pid ();
ptid_t process_ptid;
+ /* Switch terminal for any messages produced e.g. by
+ breakpoint_re_set. */
+ target_terminal::ours_for_output ();
+
/* 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.
And, we DON'T want to call delete_breakpoints() here, since
that may write the bp's "shadow contents" (the instruction
- value that was overwritten witha TRAP instruction). Since
+ value that was overwritten with a TRAP instruction). Since
we now have a new a.out, those shadow contents aren't valid. */
mark_breakpoints_out ();
/* What is this a.out's name? */
process_ptid = ptid_t (pid);
printf_unfiltered (_("%s is executing new program: %s\n"),
- target_pid_to_str (process_ptid),
+ target_pid_to_str (process_ptid).c_str (),
exec_file_target);
/* We've followed the inferior through an exec. Therefore, the
inferior has essentially been killed & reborn. */
- gdb_flush (gdb_stdout);
-
breakpoint_init_inferior (inf_execd);
gdb::unique_xmalloc_ptr<char> exec_file_host
to symbol_file_command...). */
insert_breakpoints ();
+ gdb::observers::inferior_execd.notify (inf);
+
/* The next resume of this inferior should bring it to the shlib
startup breakpoints. (If the user had also set bp's on
"main" from the old (parent) process, then they'll auto-
to avoid starvation, otherwise, we could e.g., find ourselves
constantly stepping the same couple threads past their breakpoints
over and over, if the single-step finish fast enough. */
-struct thread_info *step_over_queue_head;
+struct thread_info *global_thread_step_over_chain_head;
/* Bit flags indicating what the thread needs to step over. */
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
+ we have successfully 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.
displaced step operation on it. See displaced_step_prepare and
displaced_step_fixup for details. */
-/* Default destructor for displaced_step_closure. */
-
-displaced_step_closure::~displaced_step_closure () = default;
-
-/* Get the displaced stepping state of process PID. */
+/* Get the displaced stepping state of inferior INF. */
static displaced_step_inferior_state *
get_displaced_stepping_state (inferior *inf)
return &inf->displaced_step_state;
}
-/* Returns true if any inferior has a thread doing a displaced
- step. */
+/* Get the displaced stepping state of thread THREAD. */
-static bool
-displaced_step_in_progress_any_inferior ()
+static displaced_step_thread_state *
+get_displaced_stepping_state (thread_info *thread)
{
- for (inferior *i : all_inferiors ())
- {
- if (i->displaced_step_state.step_thread != nullptr)
- return true;
- }
-
- return false;
+ return &thread->displaced_step_state;
}
-/* Return true if thread represented by PTID is doing a displaced
- step. */
+/* Return true if the given thread is doing a displaced step. */
-static int
-displaced_step_in_progress_thread (thread_info *thread)
+static bool
+displaced_step_in_progress (thread_info *thread)
{
gdb_assert (thread != NULL);
- return get_displaced_stepping_state (thread->inf)->step_thread == thread;
+ return get_displaced_stepping_state (thread)->in_progress ();
}
-/* Return true if process PID has a thread doing a displaced step. */
+/* Return true if any thread of this inferior is doing a displaced step. */
-static int
+static bool
displaced_step_in_progress (inferior *inf)
{
- return get_displaced_stepping_state (inf)->step_thread != nullptr;
+ for (thread_info *thread : inf->non_exited_threads ())
+ {
+ if (displaced_step_in_progress (thread))
+ return true;
+ }
+
+ return false;
}
-/* If inferior is in displaced stepping, and ADDR equals to starting address
- of copy area, return corresponding displaced_step_closure. Otherwise,
- return NULL. */
+/* Return true if any thread is doing a displaced step. */
-struct displaced_step_closure*
-get_displaced_step_closure_by_addr (CORE_ADDR addr)
+static bool
+displaced_step_in_progress_any_thread ()
{
- displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (current_inferior ());
+ for (thread_info *thread : all_non_exited_threads ())
+ {
+ if (displaced_step_in_progress (thread))
+ return true;
+ }
+
+ return false;
+}
- /* If checking the mode of displaced instruction in copy area. */
- if (displaced->step_thread != nullptr
- && displaced->step_copy == addr)
- return displaced->step_closure;
+/* If inferior is in displaced stepping, and ADDR equals to starting address
+ of copy area, return corresponding displaced_step_copy_insn_closure. Otherwise,
+ return NULL. */
+struct displaced_step_copy_insn_closure *
+get_displaced_step_copy_insn_closure_by_addr (CORE_ADDR addr)
+{
+// FIXME: implement me (only needed on ARM).
+// displaced_step_inferior_state *displaced
+// = get_displaced_stepping_state (current_inferior ());
+//
+// /* If checking the mode of displaced instruction in copy area. */
+// if (displaced->step_thread != nullptr
+// && displaced->step_copy == addr)
+// return displaced->step_closure.get ();
+//
return NULL;
}
doesn't support it, GDB will instead use the traditional
hold-and-step approach. If AUTO (which is the default), GDB will
decide which technique to use to step over breakpoints depending on
- which of all-stop or non-stop mode is active --- displaced stepping
- in non-stop mode; hold-and-step in all-stop mode. */
+ whether the target works in a non-stop way (see use_displaced_stepping). */
static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO;
"to step over breakpoints is %s.\n"), value);
}
+/* Return true if the gdbarch implements the required methods to use
+ displaced stepping. */
+
+static bool
+gdbarch_supports_displaced_stepping (gdbarch *arch)
+{
+ /* Only check for the presence of copy_insn. Other required methods
+ are checked by the gdbarch validation to be provided if copy_insn is
+ provided. */
+ return gdbarch_displaced_step_copy_insn_p (arch);
+}
+
/* Return non-zero if displaced stepping can/should be used to step
over breakpoints of thread TP. */
-static int
-use_displaced_stepping (struct thread_info *tp)
+static bool
+use_displaced_stepping (thread_info *tp)
{
- struct regcache *regcache = get_thread_regcache (tp);
- struct gdbarch *gdbarch = regcache->arch ();
+ /* If the user disabled it explicitly, don't use displaced stepping. */
+ if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE)
+ return false;
+
+ /* If "auto", only use displaced stepping if the target operates in a non-stop
+ way. */
+ if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO
+ && !target_is_non_stop_p ())
+ return false;
+
+ gdbarch *gdbarch = get_thread_regcache (tp)->arch ();
+
+ /* If the architecture doesn't implement displaced stepping, don't use
+ it. */
+ if (!gdbarch_supports_displaced_stepping (gdbarch))
+ return false;
+
+ /* If recording, don't use displaced stepping. */
+ if (find_record_target () != nullptr)
+ return false;
+
displaced_step_inferior_state *displaced_state
= get_displaced_stepping_state (tp->inf);
- return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO
- && target_is_non_stop_p ())
- || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE)
- && gdbarch_displaced_step_copy_insn_p (gdbarch)
- && find_record_target () == NULL
- && !displaced_state->failed_before);
+ /* If displaced stepping failed before for this inferior, don't bother trying
+ again. */
+ if (displaced_state->failed_before)
+ return false;
+
+ return true;
}
-/* Clean out any stray displaced stepping state. */
+/* Simple function wrapper around displaced_step_thread_state::reset. */
+
static void
-displaced_step_clear (struct displaced_step_inferior_state *displaced)
+displaced_step_reset (displaced_step_thread_state *displaced)
{
- /* Indicate that there is no cleanup pending. */
- displaced->step_thread = nullptr;
-
- delete displaced->step_closure;
- displaced->step_closure = NULL;
+ displaced->reset ();
}
-static void
-displaced_step_clear_cleanup (void *arg)
-{
- struct displaced_step_inferior_state *state
- = (struct displaced_step_inferior_state *) arg;
+/* A cleanup that wraps displaced_step_reset. We use this instead of, say,
+ SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */
- displaced_step_clear (state);
-}
+using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset);
/* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
void
stepped now; 0 if displaced stepping this thread got queued; or -1
if this instruction can't be displaced stepped. */
-static int
+static displaced_step_prepare_status
displaced_step_prepare_throw (thread_info *tp)
{
regcache *regcache = get_thread_regcache (tp);
struct gdbarch *gdbarch = regcache->arch ();
- const address_space *aspace = regcache->aspace ();
- CORE_ADDR original, copy;
- ULONGEST len;
- struct displaced_step_closure *closure;
- int status;
+ displaced_step_thread_state *thread_disp_step_state
+ = get_displaced_stepping_state (tp);
/* We should never reach this function if the architecture does not
support displaced stepping. */
- gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch));
+ gdb_assert (gdbarch_supports_displaced_stepping (gdbarch));
/* Nor if the thread isn't meant to step over a breakpoint. */
gdb_assert (tp->control.trap_expected);
jump/branch). */
tp->control.may_range_step = 0;
- /* We have to displaced step one thread at a time, as we only have
- access to a single scratch space per inferior. */
-
- displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (tp->inf);
-
- if (displaced->step_thread != nullptr)
- {
- /* Already waiting for a displaced step to finish. Defer this
- request and place in queue. */
-
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog,
- "displaced: deferring step of %s\n",
- target_pid_to_str (tp->ptid));
-
- thread_step_over_chain_enqueue (tp);
- return 0;
- }
- else
- {
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog,
- "displaced: stepping %s now\n",
- target_pid_to_str (tp->ptid));
- }
-
- displaced_step_clear (displaced);
+ /* We are about to start a displaced step for this thread, if one is already
+ in progress, we goofed up somewhere. */
+ gdb_assert (!thread_disp_step_state->in_progress ());
scoped_restore_current_thread restore_thread;
switch_to_thread (tp);
- original = regcache_read_pc (regcache);
+ CORE_ADDR original_pc = regcache_read_pc (regcache);
- copy = gdbarch_displaced_step_location (gdbarch);
- len = gdbarch_max_insn_length (gdbarch);
+ displaced_step_prepare_status status =
+ current_top_target ()->displaced_step_prepare (tp);
- if (breakpoint_in_range_p (aspace, copy, len))
+ if (status == DISPLACED_STEP_PREPARE_STATUS_ERROR)
{
- /* There's a breakpoint set in the scratch pad location range
- (which is usually around the entry point). We'd either
- install it before resuming, which would overwrite/corrupt the
- scratch pad, or if it was already inserted, this displaced
- step would overwrite it. The latter is OK in the sense that
- we already assume that no thread is going to execute the code
- in the scratch pad range (after initial startup) anyway, but
- the former is unacceptable. Simply punt and fallback to
- stepping over this breakpoint in-line. */
if (debug_displaced)
- {
- fprintf_unfiltered (gdb_stdlog,
- "displaced: breakpoint set in scratch pad. "
- "Stepping over breakpoint in-line instead.\n");
- }
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: failed to prepare (%s)",
+ target_pid_to_str (tp->ptid).c_str ());
- return -1;
+ return DISPLACED_STEP_PREPARE_STATUS_ERROR;
}
-
- /* Save the original contents of the copy area. */
- displaced->step_saved_copy.resize (len);
- status = target_read_memory (copy, displaced->step_saved_copy.data (), len);
- if (status != 0)
- throw_error (MEMORY_ERROR,
- _("Error accessing memory address %s (%s) for "
- "displaced-stepping scratch space."),
- paddress (gdbarch, copy), safe_strerror (status));
- if (debug_displaced)
+ else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE)
{
- fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ",
- paddress (gdbarch, copy));
- displaced_step_dump_bytes (gdb_stdlog,
- displaced->step_saved_copy.data (),
- len);
- };
+ /* Not enough displaced stepping resources available, defer this
+ request by placing it the queue. */
- closure = gdbarch_displaced_step_copy_insn (gdbarch,
- original, copy, regcache);
- if (closure == NULL)
- {
- /* The architecture doesn't know how or want to displaced step
- this instruction or instruction sequence. Fallback to
- stepping over the breakpoint in-line. */
- return -1;
- }
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: not enough resources available, "
+ "deferring step of %s\n",
+ target_pid_to_str (tp->ptid).c_str ());
+
+ global_thread_step_over_chain_enqueue (tp);
+ tp->inf->displaced_step_state.unavailable = true;
+
+ return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE;
+ }
+
+ gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK);
+
+// FIXME: Should probably replicated in the arch implementation now.
+//
+// if (breakpoint_in_range_p (aspace, copy, len))
+// {
+// /* There's a breakpoint set in the scratch pad location range
+// (which is usually around the entry point). We'd either
+// install it before resuming, which would overwrite/corrupt the
+// scratch pad, or if it was already inserted, this displaced
+// step would overwrite it. The latter is OK in the sense that
+// we already assume that no thread is going to execute the code
+// in the scratch pad range (after initial startup) anyway, but
+// the former is unacceptable. Simply punt and fallback to
+// stepping over this breakpoint in-line. */
+// if (debug_displaced)
+// {
+// fprintf_unfiltered (gdb_stdlog,
+// "displaced: breakpoint set in scratch pad. "
+// "Stepping over breakpoint in-line instead.\n");
+// }
+//
+// gdb_assert (false);
+// gdbarch_displaced_step_release_location (gdbarch, copy);
+//
+// return -1;
+// }
/* Save the information we need to fix things up if the step
succeeds. */
- displaced->step_thread = tp;
- displaced->step_gdbarch = gdbarch;
- displaced->step_closure = closure;
- displaced->step_original = original;
- displaced->step_copy = copy;
+ thread_disp_step_state->set (gdbarch);
- cleanup *ignore_cleanups
- = make_cleanup (displaced_step_clear_cleanup, displaced);
-
- /* Resume execution at the copy. */
- regcache_write_pc (regcache, copy);
-
- discard_cleanups (ignore_cleanups);
+ // FIXME: get it from _prepare?
+ CORE_ADDR displaced_pc = 0;
if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n",
- paddress (gdbarch, copy));
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: prepared successfully thread=%s, "
+ "original_pc=%s, displaced_pc=%s\n",
+ target_pid_to_str (tp->ptid).c_str (),
+ paddress (gdbarch, original_pc),
+ paddress (gdbarch, displaced_pc));
- return 1;
+ return DISPLACED_STEP_PREPARE_STATUS_OK;
}
/* Wrapper for displaced_step_prepare_throw that disabled further
attempts at displaced stepping if we get a memory error. */
-static int
+static displaced_step_prepare_status
displaced_step_prepare (thread_info *thread)
{
- int prepared = -1;
+ displaced_step_prepare_status status
+ = DISPLACED_STEP_PREPARE_STATUS_ERROR;
- TRY
+ try
{
- prepared = displaced_step_prepare_throw (thread);
+ status = displaced_step_prepare_throw (thread);
}
- CATCH (ex, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &ex)
{
struct displaced_step_inferior_state *displaced_state;
if (ex.error != MEMORY_ERROR
&& ex.error != NOT_SUPPORTED_ERROR)
- throw_exception (ex);
+ throw;
if (debug_infrun)
{
fprintf_unfiltered (gdb_stdlog,
"infrun: disabling displaced stepping: %s\n",
- ex.message);
+ ex.what ());
}
/* Be verbose if "set displaced-stepping" is "on", silent if
if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE)
{
warning (_("disabling displaced stepping: %s"),
- ex.message);
+ ex.what ());
}
/* Disable further displaced stepping attempts. */
= get_displaced_stepping_state (thread->inf);
displaced_state->failed_before = 1;
}
- END_CATCH
-
- return prepared;
-}
-static void
-write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr,
- const gdb_byte *myaddr, int len)
-{
- scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
-
- inferior_ptid = ptid;
- write_memory (memaddr, myaddr, len);
-}
-
-/* Restore the contents of the copy area for thread PTID. */
-
-static void
-displaced_step_restore (struct displaced_step_inferior_state *displaced,
- ptid_t ptid)
-{
- ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch);
-
- write_memory_ptid (ptid, displaced->step_copy,
- displaced->step_saved_copy.data (), len);
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n",
- target_pid_to_str (ptid),
- paddress (displaced->step_gdbarch,
- displaced->step_copy));
+ return status;
}
/* If we displaced stepped an instruction successfully, adjust
-1. If the thread wasn't displaced stepping, return 0. */
static int
-displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal)
+displaced_step_finish (thread_info *event_thread, enum gdb_signal signal)
{
- struct cleanup *old_cleanups;
- struct displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (event_thread->inf);
- int ret;
+ displaced_step_thread_state *displaced
+ = get_displaced_stepping_state (event_thread);
- /* Was this event for the thread we displaced? */
- if (displaced->step_thread != event_thread)
+ /* Was this thread performing a displaced step? */
+ if (!displaced->in_progress ())
return 0;
- old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced);
-
- displaced_step_restore (displaced, displaced->step_thread->ptid);
+ displaced_step_reset_cleanup cleanup (displaced);
/* Fixup may need to read memory/registers. Switch to the thread
that we're fixing up. Also, target_stopped_by_watchpoint checks
- the current thread. */
+ the current thread, and displaced_step_restore performs ptid-dependent
+ memory accesses using current_inferior() and current_top_target(). */
switch_to_thread (event_thread);
- /* Did the instruction complete successfully? */
- if (signal == GDB_SIGNAL_TRAP
- && !(target_stopped_by_watchpoint ()
- && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch)
- || target_have_steppable_watchpoint)))
- {
- /* 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_thread));
- ret = 1;
- }
- else
- {
- /* Since the instruction didn't complete, all we can do is
- relocate the PC. */
- struct regcache *regcache = get_thread_regcache (event_thread);
- CORE_ADDR pc = regcache_read_pc (regcache);
-
- pc = displaced->step_original + (pc - displaced->step_copy);
- regcache_write_pc (regcache, pc);
- ret = -1;
- }
-
- do_cleanups (old_cleanups);
+ /* Do the fixup, and release the resources acquired to do the displaced
+ step. */
+ displaced_step_finish_status finish_status =
+ current_top_target ()->displaced_step_finish (event_thread, signal);
- displaced->step_thread = nullptr;
-
- return ret;
+ if (finish_status == DISPLACED_STEP_FINISH_STATUS_OK)
+ return 1;
+ else
+ return -1;
}
/* Data to be passed around while handling an event. This data is
start_step_over (void)
{
struct thread_info *tp, *next;
+ int started = 0;
/* Don't start a new step-over if we already have an in-line
step-over operation ongoing. */
if (step_over_info_valid_p ())
- return 0;
+ return started;
- for (tp = step_over_queue_head; tp != NULL; tp = next)
+ /* Steal the global thread step over chain. */
+ thread_info *threads_to_step = global_thread_step_over_chain_head;
+ global_thread_step_over_chain_head = NULL;
+
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: stealing list of %d threads to step from global queue\n",
+ thread_step_over_chain_length (threads_to_step));
+
+ for (inferior *inf : all_inferiors ())
+ inf->displaced_step_state.unavailable = false;
+
+ for (tp = threads_to_step; tp != NULL; tp = next)
{
struct execution_control_state ecss;
struct execution_control_state *ecs = &ecss;
gdb_assert (!tp->stop_requested);
- next = thread_step_over_chain_next (tp);
-
- /* If this inferior already has a displaced step in process,
- don't start a new one. */
- if (displaced_step_in_progress (tp->inf))
- continue;
+ next = thread_step_over_chain_next (threads_to_step, tp);
step_what = thread_still_needs_step_over (tp);
must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT)
/* We currently stop all threads of all processes to step-over
in-line. If we need to start a new in-line step-over, let
any pending displaced steps finish first. */
- if (must_be_in_line && displaced_step_in_progress_any_inferior ())
- return 0;
+ if (must_be_in_line && displaced_step_in_progress_any_thread ())
+ continue;
- thread_step_over_chain_remove (tp);
-
- if (step_over_queue_head == NULL)
- {
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: step-over queue now empty\n");
- }
+ thread_step_over_chain_remove (&threads_to_step, tp);
if (tp->control.trap_expected
|| tp->resumed
internal_error (__FILE__, __LINE__,
"[%s] has inconsistent state: "
"trap_expected=%d, resumed=%d, executing=%d\n",
- target_pid_to_str (tp->ptid),
+ target_pid_to_str (tp->ptid).c_str (),
tp->control.trap_expected,
tp->resumed,
tp->executing);
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: resuming [%s] for step-over\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
/* keep_going_pass_signal skips the step-over if the breakpoint
is no longer inserted. In all-stop, we want to keep looking
if (!target_is_non_stop_p () && !step_what)
continue;
+ if (tp->inf->displaced_step_state.unavailable)
+ {
+ global_thread_step_over_chain_enqueue (tp);
+ continue;
+ }
+
switch_to_thread (tp);
reset_ecs (ecs, tp);
keep_going_pass_signal (ecs);
if (!ecs->wait_some_more)
error (_("Command aborted."));
- gdb_assert (tp->resumed);
+ /* If the thread's step over could not be initiated, it was re-added
+ to the global step over chain. */
+ if (tp->resumed)
+ {
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "infrun: start_step_over: [%s] was resumed.\n",
+ target_pid_to_str (tp->ptid).c_str ());
+ gdb_assert (!thread_is_in_step_over_chain (tp));
+ }
+ else
+ {
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "infrun: start_step_over: [%s] was NOT resumed.\n",
+ target_pid_to_str (tp->ptid).c_str ());
+ gdb_assert (thread_is_in_step_over_chain (tp));
+
+ }
/* If we started a new in-line step-over, we're done. */
if (step_over_info_valid_p ())
{
gdb_assert (tp->control.trap_expected);
- return 1;
+ started = 1;
+ break;
}
if (!target_is_non_stop_p ())
/* With remote targets (at least), in all-stop, we can't
issue any further remote commands until the program stops
again. */
- return 1;
+ started = 1;
+ break;
}
/* Either the thread no longer needed a step-over, or a new
displaced step on a thread of other process. */
}
- return 0;
+ /* If there are threads left in the THREADS_TO_STEP list, but we have
+ detected that we can't start anything more, put back these threads
+ in the global list. */
+ if (threads_to_step == NULL)
+ {
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: step-over queue now empty\n");
+ }
+ else
+ {
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: putting back %d threads to step in global queue\n",
+ thread_step_over_chain_length (threads_to_step));
+ while (threads_to_step != nullptr)
+ {
+ thread_info *thread = threads_to_step;
+
+ /* Remove from that list. */
+ thread_step_over_chain_remove (&threads_to_step, thread);
+
+ /* Add to global list. */
+ global_thread_step_over_chain_enqueue (thread);
+
+ }
+ }
+
+ return started;
}
/* Update global variables holding ptids to hold NEW_PTID if they were
/* True if execution commands resume all threads of all processes by
default; otherwise, resume only threads of the current inferior
process. */
-int sched_multi = 0;
+bool sched_multi = false;
/* Try to setup for software single stepping over the specified location.
Return 1 if target_resume() should use hardware single step.
fprintf_unfiltered (gdb_stdlog,
"infrun: resume: thread %s has pending wait "
"status %s (currently_stepping=%d).\n",
- target_pid_to_str (tp->ptid), statstr.c_str (),
+ target_pid_to_str (tp->ptid).c_str (),
+ statstr.c_str (),
currently_stepping (tp));
}
if (sig != GDB_SIGNAL_0)
{
warning (_("Couldn't deliver signal %s to %s."),
- gdb_signal_to_name (sig), target_pid_to_str (tp->ptid));
+ gdb_signal_to_name (sig),
+ target_pid_to_str (tp->ptid).c_str ());
}
tp->suspend.stop_signal = GDB_SIGNAL_0;
"trap_expected=%d, current thread [%s] at %s\n",
step, gdb_signal_to_symbol_string (sig),
tp->control.trap_expected,
- target_pid_to_str (inferior_ptid),
+ target_pid_to_str (inferior_ptid).c_str (),
paddress (gdbarch, pc));
/* Normally, by the time we reach `resume', the breakpoints are either
&& sig == GDB_SIGNAL_0
&& !current_inferior ()->waiting_for_vfork_done)
{
- int prepared = displaced_step_prepare (tp);
+ displaced_step_prepare_status prepare_status
+ = displaced_step_prepare (tp);
- if (prepared == 0)
+ if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE)
{
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
tp->control.trap_expected = 0;
return;
}
- else if (prepared < 0)
+ else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_ERROR)
{
/* Fallback to stepping over the breakpoint in-line. */
insert_breakpoints ();
}
- else if (prepared > 0)
+ else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK)
{
- struct displaced_step_inferior_state *displaced;
-
- /* Update pc to reflect the new address from which we will
- execute instructions due to displaced stepping. */
- pc = regcache_read_pc (get_thread_regcache (tp));
-
- displaced = get_displaced_stepping_state (tp->inf);
- step = gdbarch_displaced_step_hw_singlestep (gdbarch,
- displaced->step_closure);
+ step = gdbarch_displaced_step_hw_singlestep (gdbarch, NULL);
}
+ else
+ gdb_assert_not_reached ("invalid displaced_step_prepare_status value");
}
/* Do we need to do it the hard way, w/temp breakpoints? */
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: resume: [%s] stepped breakpoint\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
tp->stepped_breakpoint = 1;
static void
resume (gdb_signal sig)
{
- TRY
+ try
{
resume_1 (sig);
}
- CATCH (ex, RETURN_MASK_ALL)
+ catch (const gdb_exception &ex)
{
/* If resuming is being aborted for any reason, delete any
single-step breakpoint resume_1 may have created, to avoid
we're running in non-stop mode. */
if (inferior_ptid != null_ptid)
delete_single_step_breakpoints (inferior_thread ());
- throw_exception (ex);
+ throw;
}
- END_CATCH
}
\f
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: clear_proceed_status_thread (%s)\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
/* If we're starting a new sequence, then the previous finished
single-step is no longer relevant. */
"infrun: clear_proceed_status: pending "
"event of %s was a finished step. "
"Discarding.\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
tp->suspend.waitstatus_pending_p = 0;
tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON;
"infrun: clear_proceed_status_thread: thread %s "
"has pending wait status %s "
"(currently_stepping=%d).\n",
- target_pid_to_str (tp->ptid), statstr.c_str (),
+ target_pid_to_str (tp->ptid).c_str (),
+ statstr.c_str (),
currently_stepping (tp));
}
}
if (!signal_pass_state (tp->suspend.stop_signal))
tp->suspend.stop_signal = GDB_SIGNAL_0;
- thread_fsm_delete (tp->thread_fsm);
+ delete tp->thread_fsm;
tp->thread_fsm = NULL;
tp->control.trap_expected = 0;
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: need to step-over [%s] first\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
- thread_step_over_chain_enqueue (tp);
+ global_thread_step_over_chain_enqueue (tp);
}
}
/* Enqueue the current thread last, so that we move all other
threads over their breakpoints first. */
if (cur_thr->stepping_over_breakpoint)
- thread_step_over_chain_enqueue (cur_thr);
+ global_thread_step_over_chain_enqueue (cur_thr);
/* If the thread isn't started, we'll still need to set its prev_pc,
so that switch_back_to_stepped_thread knows the thread hasn't
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: proceed: [%s] resumed\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p);
continue;
}
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: proceed: [%s] needs step-over\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
continue;
}
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: proceed: resuming %s\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
reset_ecs (ecs, tp);
switch_to_thread (tp);
start_step_over doesn't try to resume them
automatically. */
if (thread_is_in_step_over_chain (tp))
- thread_step_over_chain_remove (tp);
+ global_thread_step_over_chain_remove (tp);
/* If the thread is stopped, but the user/frontend doesn't
know about that yet, queue a pending event, as if the
waiton_ptid.lwp (),
waiton_ptid.tid ());
if (waiton_ptid.pid () != -1)
- stb.printf (" [%s]", target_pid_to_str (waiton_ptid));
+ stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ());
stb.printf (", status) =\n");
stb.printf ("infrun: %d.%ld.%ld [%s],\n",
result_ptid.pid (),
result_ptid.lwp (),
result_ptid.tid (),
- target_pid_to_str (result_ptid));
+ target_pid_to_str (result_ptid).c_str ());
stb.printf ("infrun: %s\n", status_string.c_str ());
/* This uses %s in part to handle %'s in the text, but also to avoid
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: Waiting for specific thread %s.\n",
- target_pid_to_str (ptid));
+ target_pid_to_str (ptid).c_str ());
/* We have a specific thread to check. */
tp = find_thread_ptid (ptid);
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: PC of %s changed. was=%s, now=%s\n",
- target_pid_to_str (tp->ptid),
+ target_pid_to_str (tp->ptid).c_str (),
paddress (gdbarch, tp->suspend.stop_pc),
paddress (gdbarch, pc));
discard = 1;
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: previous breakpoint of %s, at %s gone\n",
- target_pid_to_str (tp->ptid),
+ target_pid_to_str (tp->ptid).c_str (),
paddress (gdbarch, pc));
discard = 1;
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: pending event of %s cancelled.\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS;
tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON;
fprintf_unfiltered (gdb_stdlog,
"infrun: Using pending wait status %s for %s.\n",
statstr.c_str (),
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
}
/* Now that we've selected our final event LWP, un-adjust its PC
struct inferior *inf = current_inferior ();
ptid_t pid_ptid = ptid_t (inf->pid);
- displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf);
+ // displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf);
/* Is any thread of this process displaced stepping? If not,
there's nothing else to do. */
- if (displaced->step_thread == nullptr)
+ if (displaced_step_in_progress (inf))
return;
if (debug_infrun)
scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true);
- while (displaced->step_thread != nullptr)
+ // FIXME
+ while (false)
{
struct execution_control_state ecss;
struct execution_control_state *ecs;
{
if (ecs->event_thread != NULL
&& ecs->event_thread->thread_fsm != NULL)
- thread_fsm_clean_up (ecs->event_thread->thread_fsm,
- ecs->event_thread);
+ ecs->event_thread->thread_fsm->clean_up (ecs->event_thread);
if (!non_stop)
{
continue;
switch_to_thread (thr);
- thread_fsm_clean_up (thr->thread_fsm, thr);
+ thr->thread_fsm->clean_up (thr);
}
if (ecs->event_thread != NULL)
struct thread_fsm *thread_fsm = thr->thread_fsm;
if (thread_fsm != NULL)
- should_stop = thread_fsm_should_stop (thread_fsm, thr);
+ should_stop = thread_fsm->should_stop (thr);
}
if (!should_stop)
}
else
{
- int should_notify_stop = 1;
+ bool should_notify_stop = true;
int proceeded = 0;
clean_up_just_stopped_threads_fsms (ecs);
if (thr != NULL && thr->thread_fsm != NULL)
- {
- should_notify_stop
- = thread_fsm_should_notify_stop (thr->thread_fsm);
- }
+ should_notify_stop = thr->thread_fsm->should_notify_stop ();
if (should_notify_stop)
{
&& ecs->event_thread != inferior_thread ())
{
fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ",
- target_pid_to_str (inferior_ptid));
+ target_pid_to_str (inferior_ptid).c_str ());
fprintf_unfiltered (gdb_stdlog, "to %s\n",
- target_pid_to_str (ecs->ptid));
+ target_pid_to_str (ecs->ptid).c_str ());
}
switch_to_thread (ecs->event_thread);
{
if (!ecs->stop_func_filled_in)
{
+ const block *block;
+
/* Don't care about return value; stop_func_start and stop_func_name
will both be 0 if it doesn't work. */
- find_function_entry_range_from_pc (ecs->event_thread->suspend.stop_pc,
- &ecs->stop_func_name,
- &ecs->stop_func_start,
- &ecs->stop_func_end);
- ecs->stop_func_start
- += gdbarch_deprecated_function_start_offset (gdbarch);
-
- if (gdbarch_skip_entrypoint_p (gdbarch))
- ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch,
- ecs->stop_func_start);
+ find_pc_partial_function (ecs->event_thread->suspend.stop_pc,
+ &ecs->stop_func_name,
+ &ecs->stop_func_start,
+ &ecs->stop_func_end,
+ &block);
+
+ /* The call to find_pc_partial_function, above, will set
+ stop_func_start and stop_func_end to the start and end
+ of the range containing the stop pc. If this range
+ contains the entry pc for the block (which is always the
+ case for contiguous blocks), advance stop_func_start past
+ the function's start offset and entrypoint. Note that
+ stop_func_start is NOT advanced when in a range of a
+ non-contiguous block that does not contain the entry pc. */
+ if (block != nullptr
+ && ecs->stop_func_start <= BLOCK_ENTRY_PC (block)
+ && BLOCK_ENTRY_PC (block) < ecs->stop_func_end)
+ {
+ ecs->stop_func_start
+ += gdbarch_deprecated_function_start_offset (gdbarch);
+
+ if (gdbarch_skip_entrypoint_p (gdbarch))
+ ecs->stop_func_start
+ = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start);
+ }
ecs->stop_func_filled_in = 1;
}
fprintf_unfiltered (gdb_stdlog,
"infrun: %s executing, "
"need stop\n",
- target_pid_to_str (t->ptid));
+ target_pid_to_str (t->ptid).c_str ());
target_stop (t->ptid);
t->stop_requested = 1;
}
fprintf_unfiltered (gdb_stdlog,
"infrun: %s executing, "
"already stopping\n",
- target_pid_to_str (t->ptid));
+ target_pid_to_str (t->ptid).c_str ());
}
if (t->stop_requested)
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: %s not executing\n",
- target_pid_to_str (t->ptid));
+ target_pid_to_str (t->ptid).c_str ());
/* The thread may be not executing, but still be
resumed with a pending status to process. */
pass = -1;
event_ptid = wait_one (&ws);
-
- if (ws.kind == TARGET_WAITKIND_NO_RESUMED)
+ if (debug_infrun)
{
- /* All resumed threads exited. */
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: stop_all_threads %s %s\n",
+ target_waitstatus_to_string (&ws).c_str (),
+ target_pid_to_str (event_ptid).c_str ());
}
- else if (ws.kind == TARGET_WAITKIND_THREAD_EXITED
- || ws.kind == TARGET_WAITKIND_EXITED
- || ws.kind == TARGET_WAITKIND_SIGNALLED)
- {
- if (debug_infrun)
- {
- ptid_t ptid = ptid_t (ws.value.integer);
- fprintf_unfiltered (gdb_stdlog,
- "infrun: %s exited while "
- "stopping threads\n",
- target_pid_to_str (ptid));
- }
+ if (ws.kind == TARGET_WAITKIND_NO_RESUMED
+ || ws.kind == TARGET_WAITKIND_THREAD_EXITED
+ || ws.kind == TARGET_WAITKIND_EXITED
+ || ws.kind == TARGET_WAITKIND_SIGNALLED)
+ {
+ /* All resumed threads exited
+ or one thread/process exited/signalled. */
}
else
{
t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE;
t->suspend.waitstatus_pending_p = 0;
- if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0)
+ if (displaced_step_finish (t, GDB_SIGNAL_0) < 0)
{
/* Add it back to the step-over queue. */
if (debug_infrun)
"infrun: displaced-step of %s "
"canceled: adding back to the "
"step-over queue\n",
- target_pid_to_str (t->ptid));
+ target_pid_to_str (t->ptid).c_str ());
}
t->control.trap_expected = 0;
- thread_step_over_chain_enqueue (t);
+ global_thread_step_over_chain_enqueue (t);
}
}
else
sig = (ws.kind == TARGET_WAITKIND_STOPPED
? ws.value.sig : GDB_SIGNAL_0);
- if (displaced_step_fixup (t, sig) < 0)
+ if (displaced_step_finish (t, sig) < 0)
{
/* Add it back to the step-over queue. */
t->control.trap_expected = 0;
- thread_step_over_chain_enqueue (t);
+ global_thread_step_over_chain_enqueue (t);
}
regcache = get_thread_regcache (t);
"(currently_stepping=%d)\n",
paddress (target_gdbarch (),
t->suspend.stop_pc),
- target_pid_to_str (t->ptid),
+ target_pid_to_str (t->ptid).c_str (),
currently_stepping (t));
}
}
once). */
static void
-handle_inferior_event_1 (struct execution_control_state *ecs)
+handle_inferior_event (struct execution_control_state *ecs)
{
+ /* Make sure that all temporary struct value objects that were
+ created during the handling of the event get deleted at the
+ end. */
+ scoped_value_mark free_values;
+
enum stop_kind stop_soon;
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog, "infrun: handle_inferior_event %s\n",
+ target_waitstatus_to_string (&ecs->ws).c_str ());
+
if (ecs->ws.kind == TARGET_WAITKIND_IGNORE)
{
/* We had an event in the inferior, but we are not interested in
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_THREAD_EXITED)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_EXITED\n");
prepare_to_wait (ecs);
return;
}
{
/* No unwaited-for children left. IOW, all resumed children
have exited. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n");
-
stop_print_frame = 0;
stop_waiting (ecs);
return;
switch (ecs->ws.kind)
{
case TARGET_WAITKIND_LOADED:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n");
context_switch (ecs);
/* Ignore gracefully during startup of the inferior, as it might
be the shell which has just loaded some objects, otherwise
_("unhandled stop_soon: %d"), (int) stop_soon);
case TARGET_WAITKIND_SPURIOUS:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n");
if (handle_stop_requested (ecs))
return;
context_switch (ecs);
return;
case TARGET_WAITKIND_THREAD_CREATED:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_CREATED\n");
if (handle_stop_requested (ecs))
return;
context_switch (ecs);
case TARGET_WAITKIND_EXITED:
case TARGET_WAITKIND_SIGNALLED:
- if (debug_infrun)
- {
- if (ecs->ws.kind == TARGET_WAITKIND_EXITED)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: TARGET_WAITKIND_EXITED\n");
- else
- fprintf_unfiltered (gdb_stdlog,
- "infrun: TARGET_WAITKIND_SIGNALLED\n");
- }
-
inferior_ptid = ecs->ptid;
set_current_inferior (find_inferior_ptid (ecs->ptid));
set_current_program_space (current_inferior ()->pspace);
the above cases end in a continue or goto. */
case TARGET_WAITKIND_FORKED:
case TARGET_WAITKIND_VFORKED:
- if (debug_infrun)
- {
- if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n");
- else
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n");
- }
-
/* Check whether the inferior is displaced stepping. */
{
struct regcache *regcache = get_thread_regcache (ecs->event_thread);
/* If checking displaced stepping is supported, and thread
ecs->ptid is displaced stepping. */
- if (displaced_step_in_progress_thread (ecs->event_thread))
+ if (displaced_step_in_progress (ecs->event_thread))
{
struct inferior *parent_inf
= find_inferior_ptid (ecs->ptid);
struct regcache *child_regcache;
CORE_ADDR parent_pc;
+ if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
+ {
+ // struct displaced_step_inferior_state *displaced
+ // = get_displaced_stepping_state (parent_inf);
+
+ /* Restore scratch pad for child process. */
+ //displaced_step_restore (displaced, ecs->ws.value.related_pid);
+ // FIXME: we should restore all the buffers that were currently in use
+ }
+
/* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED,
indicating that the displaced stepping of syscall instruction
has been done. Perform cleanup for parent process here. Note
that this operation also cleans up the child process for vfork,
because their pages are shared. */
- displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP);
+ displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP);
/* Start a new step-over in another thread if there's one
that needs it. */
start_step_over ();
- if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
- {
- struct displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (parent_inf);
-
- /* Restore scratch pad for child process. */
- displaced_step_restore (displaced, ecs->ws.value.related_pid);
- }
-
/* Since the vfork/fork syscall instruction was executed in the scratchpad,
the child's PC is also within the scratchpad. Set the child's PC
to the parent's PC value, which has already been fixed up.
/* 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");
-
context_switch (ecs);
current_inferior ()->waiting_for_vfork_done = 0;
return;
case TARGET_WAITKIND_EXECD:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n");
/* Note we can't read registers yet (the stop_pc), because we
don't yet know the inferior's post-exec architecture.
/* Be careful not to try to gather much state about a thread
that's in a syscall. It's frequently a losing proposition. */
case TARGET_WAITKIND_SYSCALL_ENTRY:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
/* Getting the current syscall number. */
if (handle_syscall_event (ecs) == 0)
process_event_stop_test (ecs);
syscall. Stepping one instruction seems to get it back
into user code.) */
case TARGET_WAITKIND_SYSCALL_RETURN:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
if (handle_syscall_event (ecs) == 0)
process_event_stop_test (ecs);
return;
case TARGET_WAITKIND_STOPPED:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n");
handle_signal_stop (ecs);
return;
case TARGET_WAITKIND_NO_HISTORY:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n");
/* Reverse execution: target ran out of history info. */
/* Switch to the stopped thread. */
}
}
-/* A wrapper around handle_inferior_event_1, which also makes sure
- that all temporary struct value objects that were created during
- the handling of the event get deleted at the end. */
-
-static void
-handle_inferior_event (struct execution_control_state *ecs)
-{
- struct value *mark = value_mark ();
-
- handle_inferior_event_1 (ecs);
- /* Purge all temporary values created during the event handling,
- as it could be a long time before we return to the command level
- where such values would otherwise be purged. */
- value_free_to_mark (mark);
-}
-
/* Restart threads back to what they were trying to do back when we
paused them for an in-line step-over. The EVENT_THREAD thread is
ignored. */
fprintf_unfiltered (gdb_stdlog,
"infrun: restart threads: "
"[%s] is event thread\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
continue;
}
fprintf_unfiltered (gdb_stdlog,
"infrun: restart threads: "
"[%s] not meant to be running\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
continue;
}
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: restart threads: [%s] resumed\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p);
continue;
}
fprintf_unfiltered (gdb_stdlog,
"infrun: restart threads: "
"[%s] needs step-over\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
gdb_assert (!tp->resumed);
continue;
}
fprintf_unfiltered (gdb_stdlog,
"infrun: restart threads: "
"[%s] has pending status\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
tp->resumed = 1;
continue;
}
internal_error (__FILE__, __LINE__,
"thread [%s] needs a step-over, but not in "
"step-over queue\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
}
if (currently_stepping (tp))
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: restart threads: [%s] was stepping\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
keep_going_stepped_thread (tp);
}
else
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: restart threads: [%s] continuing\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
reset_ecs (ecs, tp);
switch_to_thread (tp);
keep_going_pass_signal (ecs);
{
int had_step_over_info;
- displaced_step_fixup (ecs->event_thread,
- ecs->event_thread->suspend.stop_signal);
+ displaced_step_finish (ecs->event_thread,
+ ecs->event_thread->suspend.stop_signal);
had_step_over_info = step_over_info_valid_p ();
context_switch (ecs);
insert_breakpoints ();
- restart_threads (ecs->event_thread);
+ {
+ scoped_restore save_defer_tc
+ = make_scoped_defer_target_commit_resume ();
+ restart_threads (ecs->event_thread);
+ }
+ target_commit_resume ();
/* If we have events pending, go through handle_inferior_event
again, picking up a pending event at random. This avoids
"(currently_stepping=%d)\n",
paddress (target_gdbarch (),
tp->suspend.stop_pc),
- target_pid_to_str (tp->ptid),
+ target_pid_to_str (tp->ptid).c_str (),
currently_stepping (tp));
}
fprintf_unfiltered (gdb_stdlog,
"infrun: [%s] hit another thread's "
"single-step breakpoint\n",
- target_pid_to_str (ecs->ptid));
+ target_pid_to_str (ecs->ptid).c_str ());
}
ecs->hit_singlestep_breakpoint = 1;
}
fprintf_unfiltered (gdb_stdlog,
"infrun: [%s] hit its "
"single-step breakpoint\n",
- target_pid_to_str (ecs->ptid));
+ target_pid_to_str (ecs->ptid).c_str ());
}
}
}
return;
}
- /* Note: step_resume_breakpoint may be non-NULL. This occures
+ /* Note: step_resume_breakpoint may be non-NULL. This occurs
when either there's a nested signal, or when there's a
pending signal enabled just as the signal handler returns
(leaving the inferior at the step-resume-breakpoint without
{
fprintf_unfiltered (gdb_stdlog,
"infrun: need to finish step-over of [%s]\n",
- target_pid_to_str (ecs->event_thread->ptid));
+ target_pid_to_str (ecs->event_thread->ptid).c_str ());
}
keep_going (ecs);
return 1;
fprintf_unfiltered (gdb_stdlog,
"infrun: need to step [%s] over single-step "
"breakpoint\n",
- target_pid_to_str (ecs->ptid));
+ target_pid_to_str (ecs->ptid).c_str ());
}
keep_going (ecs);
return 1;
{
fprintf_unfiltered (gdb_stdlog,
"infrun: thread [%s] still needs step-over\n",
- target_pid_to_str (ecs->event_thread->ptid));
+ target_pid_to_str (ecs->event_thread->ptid).c_str ());
}
keep_going (ecs);
return 1;
internal_error (__FILE__, __LINE__,
"[%s] has inconsistent state: "
"trap_expected=%d\n",
- target_pid_to_str (tp->ptid),
+ target_pid_to_str (tp->ptid).c_str (),
tp->control.trap_expected);
}
struct frame_info *frame,
struct symbol *sym)
{
- TRY
+ try
{
struct block_symbol vsym;
struct value *value;
CORE_ADDR handler;
struct breakpoint *bp;
- vsym = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym),
+ vsym = lookup_symbol_search_name (sym->search_name (),
b, VAR_DOMAIN);
value = read_var_value (vsym.symbol, vsym.block, frame);
/* If the value was optimized out, revert to the old behavior. */
inferior_thread ()->control.exception_resume_breakpoint = bp;
}
}
- CATCH (e, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &e)
{
/* We want to ignore errors here. */
}
- END_CATCH
}
/* A helper for check_exception_resume that sets an
if (!func)
return;
- TRY
+ try
{
const struct block *b;
struct block_iterator iter;
}
}
}
- CATCH (e, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &e)
{
}
- END_CATCH
}
static void
fprintf_unfiltered (gdb_stdlog,
"infrun: %s has trap_expected set, "
"resuming to collect trap\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
/* We haven't yet gotten our trap, and either: intercepted a
non-signal event (e.g., a fork); or took a signal which we
fprintf_unfiltered (gdb_stdlog,
"infrun: step-over already in progress: "
"step-over for %s deferred\n",
- target_pid_to_str (tp->ptid));
- thread_step_over_chain_enqueue (tp);
+ target_pid_to_str (tp->ptid).c_str ());
+ global_thread_step_over_chain_enqueue (tp);
}
else
{
fprintf_unfiltered (gdb_stdlog,
"infrun: step-over in progress: "
"resume of %s deferred\n",
- target_pid_to_str (tp->ptid));
+ target_pid_to_str (tp->ptid).c_str ());
}
}
else
stop_all_threads ();
/* Stop stepping if inserting breakpoints fails. */
- TRY
+ try
{
insert_breakpoints ();
}
- CATCH (e, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &e)
{
exception_print (gdb_stderr, e);
stop_waiting (ecs);
clear_step_over_info ();
return;
}
- END_CATCH
ecs->event_thread->control.trap_expected = (remove_bp || remove_wps);
print_exited_reason (struct ui_out *uiout, int exitstatus)
{
struct inferior *inf = current_inferior ();
- const char *pidstr = target_pid_to_str (ptid_t (inf->pid));
+ std::string pidstr = target_pid_to_str (ptid_t (inf->pid));
annotate_exited (exitstatus);
if (exitstatus)
{
if (uiout->is_mi_like_p ())
uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED));
- uiout->text ("[Inferior ");
- uiout->text (plongest (inf->num));
- uiout->text (" (");
- uiout->text (pidstr);
- uiout->text (") exited with code ");
- uiout->field_fmt ("exit-code", "0%o", (unsigned int) exitstatus);
- uiout->text ("]\n");
+ std::string exit_code_str
+ = string_printf ("0%o", (unsigned int) exitstatus);
+ uiout->message ("[Inferior %s (%s) exited with code %pF]\n",
+ plongest (inf->num), pidstr.c_str (),
+ string_field ("exit-code", exit_code_str.c_str ()));
}
else
{
if (uiout->is_mi_like_p ())
uiout->field_string
("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY));
- uiout->text ("[Inferior ");
- uiout->text (plongest (inf->num));
- uiout->text (" (");
- uiout->text (pidstr);
- uiout->text (") exited normally]\n");
+ uiout->message ("[Inferior %s (%s) exited normally]\n",
+ plongest (inf->num), pidstr.c_str ());
}
}
const char *name;
uiout->text ("\nThread ");
- uiout->field_fmt ("thread-id", "%s", print_thread_id (thr));
+ uiout->field_string ("thread-id", print_thread_id (thr));
name = thr->name != NULL ? thr->name : target_thread_name (thr);
if (name != NULL)
{
uiout->text (" \"");
- uiout->field_fmt ("name", "%s", name);
+ uiout->field_string ("name", name);
uiout->text ("\"");
}
}
/* See infrun.h. */
void
-print_stop_event (struct ui_out *uiout)
+print_stop_event (struct ui_out *uiout, bool displays)
{
struct target_waitstatus last;
ptid_t last_ptid;
print_stop_location (&last);
/* Display the auto-display expressions. */
- do_displays ();
+ if (displays)
+ do_displays ();
}
tp = inferior_thread ();
if (tp->thread_fsm != NULL
- && thread_fsm_finished_p (tp->thread_fsm))
+ && tp->thread_fsm->finished_p ())
{
struct return_value_info *rv;
- rv = thread_fsm_return_value (tp->thread_fsm);
+ rv = tp->thread_fsm->return_value ();
if (rv != NULL)
print_return_value (uiout, rv);
}
{
target_terminal::ours_for_output ();
printf_filtered (_("[Switching to %s]\n"),
- target_pid_to_str (inferior_ptid));
+ target_pid_to_str (inferior_ptid).c_str ());
annotate_thread_changed ();
}
previous_inferior_ptid = inferior_ptid;
{
stop_context saved_context;
- TRY
+ try
{
execute_cmd_pre_hook (stop_command);
}
- CATCH (ex, RETURN_MASK_ALL)
+ catch (const gdb_exception &ex)
{
exception_fprintf (gdb_stderr, ex,
"Error while running hook_stop:\n");
}
- END_CATCH
/* If the stop hook resumes the target, then there's no point in
trying to notify about the previous stop; its context is
if (target_has_execution)
{
if (last.kind != TARGET_WAITKIND_SIGNALLED
- && last.kind != TARGET_WAITKIND_EXITED)
+ && last.kind != TARGET_WAITKIND_EXITED
+ && last.kind != TARGET_WAITKIND_NO_RESUMED)
/* 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 (inferior_thread ()->control.stop_bpstat);
sigs[signum] = 1;
}
else
- {
- printf_unfiltered (_("Not confirmed, unchanged.\n"));
- gdb_flush (gdb_stdout);
- }
+ printf_unfiltered (_("Not confirmed, unchanged.\n"));
}
break;
case GDB_SIGNAL_0:
/* The point of the try/catch is that if the stack is clobbered,
walking the stack might encounter a garbage pointer and
error() trying to dereference it. */
- TRY
+ try
{
restore_selected_frame (inf_status->selected_frame_id);
}
- CATCH (ex, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &ex)
{
exception_fprintf (gdb_stderr, ex,
"Unable to restore previously selected frame:\n");
innermost frame. */
select_frame (get_current_frame ());
}
- END_CATCH
}
delete inf_status;
projects / deliverable / binutils-gdb.git / blobdiff