/* Select target systems and architectures at runtime for GDB.
- Copyright (C) 1990-2019 Free Software Foundation, Inc.
+ Copyright (C) 1990-2020 Free Software Foundation, Inc.
Contributed by Cygnus Support.
#include "inline-frame.h"
#include "tracepoint.h"
#include "gdb/fileio.h"
-#include "common/agent.h"
+#include "gdbsupport/agent.h"
#include "auxv.h"
#include "target-debug.h"
#include "top.h"
#include "event-top.h"
#include <algorithm>
-#include "common/byte-vector.h"
+#include "gdbsupport/byte-vector.h"
#include "terminal.h"
#include <unordered_map>
static struct target_ops *the_debug_target;
-/* The target stack. */
-
-static target_stack g_target_stack;
-
/* Top of target stack. */
/* The target structure we are currently using to talk to a process
or file or whatever "inferior" we have. */
target_ops *
current_top_target ()
{
- return g_target_stack.top ();
+ return current_inferior ()->top_target ();
}
/* Command list for target. */
static struct cmd_list_element *targetlist = NULL;
-/* Nonzero if we should trust readonly sections from the
+/* True if we should trust readonly sections from the
executable when reading memory. */
-static int trust_readonly = 0;
+static bool trust_readonly = false;
/* Nonzero if we should show true memory content including
memory breakpoint inserted by gdb. */
/* These globals control whether GDB attempts to perform these
operations; they are useful for targets that need to prevent
- inadvertant disruption, such as in non-stop mode. */
+ inadvertent disruption, such as in non-stop mode. */
-int may_write_registers = 1;
+bool may_write_registers = true;
-int may_write_memory = 1;
+bool may_write_memory = true;
-int may_insert_breakpoints = 1;
+bool may_insert_breakpoints = true;
-int may_insert_tracepoints = 1;
+bool may_insert_tracepoints = true;
-int may_insert_fast_tracepoints = 1;
+bool may_insert_fast_tracepoints = true;
-int may_stop = 1;
+bool may_stop = true;
/* Non-zero if we want to see trace of target level stuff. */
return 0;
}
-int
-target_has_execution_1 (ptid_t the_ptid)
+bool
+target_has_execution_1 (inferior *inf)
{
- for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ())
- if (t->has_execution (the_ptid))
- return 1;
+ for (target_ops *t = inf->top_target ();
+ t != nullptr;
+ t = inf->find_target_beneath (t))
+ if (t->has_execution (inf))
+ return true;
- return 0;
+ return false;
}
int
target_has_execution_current (void)
{
- return target_has_execution_1 (inferior_ptid);
+ return target_has_execution_1 (current_inferior ());
}
/* This is used to implement the various target commands. */
bool
target_supports_terminal_ours (void)
{
- /* This can be called before there is any target, so we must check
- for nullptr here. */
- target_ops *top = current_top_target ();
+ /* The current top target is the target at the top of the target
+ stack of the current inferior. While normally there's always an
+ inferior, we must check for nullptr here because we can get here
+ very early during startup, before the initial inferior is first
+ created. */
+ inferior *inf = current_inferior ();
- if (top == nullptr)
+ if (inf == nullptr)
return false;
- return top->supports_terminal_ours ();
+ return inf->top_target ()->supports_terminal_ours ();
}
static void
/* See target.h. */
+void
+decref_target (target_ops *t)
+{
+ t->decref ();
+ if (t->refcount () == 0)
+ target_close (t);
+}
+
+/* See target.h. */
+
void
target_stack::push (target_ops *t)
{
- /* If there's already a target at this stratum, remove it. */
+ t->incref ();
+
strata stratum = t->stratum ();
+ /* If there's already a target at this stratum, remove it. */
+
if (m_stack[stratum] != NULL)
- {
- target_ops *prev = m_stack[stratum];
- m_stack[stratum] = NULL;
- target_close (prev);
- }
+ unpush (m_stack[stratum]);
/* Now add the new one. */
m_stack[stratum] = t;
void
push_target (struct target_ops *t)
{
- g_target_stack.push (t);
+ current_inferior ()->push_target (t);
}
-/* See target.h */
+/* See target.h. */
void
push_target (target_ops_up &&t)
{
- g_target_stack.push (t.get ());
+ current_inferior ()->push_target (t.get ());
t.release ();
}
int
unpush_target (struct target_ops *t)
{
- return g_target_stack.unpush (t);
+ return current_inferior ()->unpush_target (t);
}
/* See target.h. */
if (m_top == stratum)
m_top = t->beneath ()->stratum ();
- /* Finally close the target. Note we do this after unchaining, so
- any target method calls from within the target_close
- implementation don't end up in T anymore. */
- target_close (t);
+ /* Finally close the target, if there are no inferiors
+ referencing this target still. Note we do this after unchaining,
+ so any target method calls from within the target_close
+ implementation don't end up in T anymore. Do leave the target
+ open if we have are other inferiors referencing this target
+ still. */
+ decref_target (t);
return true;
}
pop_all_targets_above (dummy_stratum);
}
-/* Return 1 if T is now pushed in the target stack. Return 0 otherwise. */
+/* Return true if T is now pushed in the current inferior's target
+ stack. Return false otherwise. */
-int
-target_is_pushed (struct target_ops *t)
+bool
+target_is_pushed (target_ops *t)
{
- return g_target_stack.is_pushed (t);
+ return current_inferior ()->target_is_pushed (t);
}
/* Default implementation of to_get_thread_local_address. */
secp = target_section_by_addr (ops, memaddr);
if (secp != NULL
- && (bfd_get_section_flags (secp->the_bfd_section->owner,
- secp->the_bfd_section)
- & SEC_READONLY))
+ && (bfd_section_flags (secp->the_bfd_section) & SEC_READONLY))
{
table = target_get_section_table (ops);
return section_table_xfer_memory_partial (readbuf, writebuf,
agent_capability_invalidate ();
}
-/* Callback for iterate_over_inferiors. Gets rid of the given
- inferior. */
-
-static int
-dispose_inferior (struct inferior *inf, void *args)
-{
- /* Not all killed inferiors can, or will ever be, removed from the
- inferior list. Killed inferiors clearly don't need to be killed
- again, so, we're done. */
- if (inf->pid == 0)
- return 0;
-
- thread_info *thread = any_thread_of_inferior (inf);
- if (thread != NULL)
- {
- switch_to_thread (thread);
-
- /* Core inferiors actually should be detached, not killed. */
- if (target_has_execution)
- target_kill ();
- else
- target_detach (inf, 0);
- }
-
- return 0;
-}
-
/* This is to be called by the open routine before it does
anything. */
{
dont_repeat ();
- if (have_inferiors ())
+ if (current_inferior ()->pid != 0)
{
if (!from_tty
- || !have_live_inferiors ()
+ || !target_has_execution
|| query (_("A program is being debugged already. Kill it? ")))
- iterate_over_inferiors (dispose_inferior, NULL);
+ {
+ /* Core inferiors actually should be detached, not
+ killed. */
+ if (target_has_execution)
+ target_kill ();
+ else
+ target_detach (current_inferior (), 0);
+ }
else
error (_("Program not killed."));
}
prepare_for_detach ();
+ /* Hold a strong reference because detaching may unpush the
+ target. */
+ auto proc_target_ref = target_ops_ref::new_reference (inf->process_target ());
+
current_top_target ()->detach (inf, from_tty);
- registers_changed_ptid (save_pid_ptid);
+ process_stratum_target *proc_target
+ = as_process_stratum_target (proc_target_ref.get ());
+
+ registers_changed_ptid (proc_target, save_pid_ptid);
/* We have to ensure we have no frame cache left. Normally,
registers_changed_ptid (save_pid_ptid) calls reinit_frame_cache when
const char *
target_thread_name (struct thread_info *info)
{
+ gdb_assert (info->inf == current_inferior ());
+
return current_top_target ()->thread_name (info);
}
void
target_resume (ptid_t ptid, int step, enum gdb_signal signal)
{
+ process_stratum_target *curr_target = current_inferior ()->process_target ();
+
target_dcache_invalidate ();
current_top_target ()->resume (ptid, step, signal);
- registers_changed_ptid (ptid);
+ registers_changed_ptid (curr_target, ptid);
/* We only set the internal executing state here. The user/frontend
running state is set at a higher level. This also clears the
thread's stop_pc as side effect. */
- set_executing (ptid, 1);
- clear_inline_frame_state (ptid);
+ set_executing (curr_target, ptid, 1);
+ clear_inline_frame_state (curr_target, ptid);
}
/* If true, target_commit_resume is a nop. */
/* Whether GDB is allowed to fall back to the default run target for
"run", "attach", etc. when no target is connected yet. */
-static int auto_connect_native_target = 1;
+static bool auto_connect_native_target = true;
static void
show_auto_connect_native_target (struct ui_file *file, int from_tty,
return target_read_stralloc (t, TARGET_OBJECT_OSDATA, type);
}
-
/* Determine the current address space of thread PTID. */
struct address_space *
target_ops *
target_ops::beneath () const
{
- return g_target_stack.find_beneath (this);
+ return current_inferior ()->find_target_beneath (this);
}
void
return gdb::unique_xmalloc_ptr<char> (nullptr);
if (transferred == 0)
- return gdb::unique_xmalloc_ptr<char> (xstrdup (""));
+ return make_unique_xstrdup ("");
bufstr[transferred] = 0;
struct target_ops *
find_target_at (enum strata stratum)
{
- return g_target_stack.at (stratum);
+ return current_inferior ()->target_at (stratum);
}
\f
static dummy_target the_dummy_target;
+/* See target.h. */
+
+target_ops *
+get_dummy_target ()
+{
+ return &the_dummy_target;
+}
+
static const target_info dummy_target_info = {
"None",
N_("None"),
void
target_pass_ctrlc (void)
{
- current_top_target ()->pass_ctrlc ();
+ /* Pass the Ctrl-C to the first target that has a thread
+ running. */
+ for (inferior *inf : all_inferiors ())
+ {
+ target_ops *proc_target = inf->process_target ();
+ if (proc_target == NULL)
+ continue;
+
+ for (thread_info *thr : inf->threads ())
+ {
+ /* A thread can be THREAD_STOPPED and executing, while
+ running an infcall. */
+ if (thr->state == THREAD_RUNNING || thr->executing)
+ {
+ /* We can get here quite deep in target layers. Avoid
+ switching thread context or anything that would
+ communicate with the target (e.g., to fetch
+ registers), or flushing e.g., the frame cache. We
+ just switch inferior in order to be able to call
+ through the target_stack. */
+ scoped_restore_current_inferior restore_inferior;
+ set_current_inferior (inf);
+ current_top_target ()->pass_ctrlc ();
+ return;
+ }
+ }
+ }
}
/* See target.h. */
target_stop_and_wait (ptid_t ptid)
{
struct target_waitstatus status;
- int was_non_stop = non_stop;
+ bool was_non_stop = non_stop;
- non_stop = 1;
+ non_stop = true;
target_stop (ptid);
memset (&status, 0, sizeof (status));
ui_out_emit_tuple tuple_emitter (current_uiout, "erased-regions");
current_uiout->message (_("Erasing flash memory region at address "));
- current_uiout->field_fmt ("address", "%s", paddress (gdbarch, m.lo));
+ current_uiout->field_core_addr ("address", gdbarch, m.lo);
current_uiout->message (", size = ");
- current_uiout->field_fmt ("size", "%s", hex_string (m.hi - m.lo));
+ current_uiout->field_string ("size", hex_string (m.hi - m.lo));
current_uiout->message ("\n");
}
}
/* Controls if targets can report that they can/are async. This is
just for maintainers to use when debugging gdb. */
-int target_async_permitted = 1;
+bool target_async_permitted = true;
/* The set command writes to this variable. If the inferior is
executing, target_async_permitted is *not* updated. */
-static int target_async_permitted_1 = 1;
+static bool target_async_permitted_1 = true;
static void
maint_set_target_async_command (const char *args, int from_tty,
/* Temporary copies of permission settings. */
-static int may_write_registers_1 = 1;
-static int may_write_memory_1 = 1;
-static int may_insert_breakpoints_1 = 1;
-static int may_insert_tracepoints_1 = 1;
-static int may_insert_fast_tracepoints_1 = 1;
-static int may_stop_1 = 1;
+static bool may_write_registers_1 = true;
+static bool may_write_memory_1 = true;
+static bool may_insert_breakpoints_1 = true;
+static bool may_insert_tracepoints_1 = true;
+static bool may_insert_fast_tracepoints_1 = true;
+static bool may_stop_1 = true;
/* Make the user-set values match the real values again. */
}
void
-initialize_targets (void)
+_initialize_target ()
{
- push_target (&the_dummy_target);
-
the_debug_target = new debug_target ();
add_info ("target", info_target_command, targ_desc);
projects / deliverable / binutils-gdb.git / blobdiff