457 lines
15 KiB
C
457 lines
15 KiB
C
/* Ada Ravenscar thread support.
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Copyright (C) 2004-2016 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "gdbthread.h"
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#include "ada-lang.h"
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#include "target.h"
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#include "inferior.h"
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#include "command.h"
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#include "ravenscar-thread.h"
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#include "observer.h"
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#include "gdbcmd.h"
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#include "top.h"
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#include "regcache.h"
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#include "objfiles.h"
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/* If non-null, ravenscar task support is enabled. */
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static int ravenscar_task_support = 1;
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/* This module's target-specific operations. */
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static struct target_ops ravenscar_ops;
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/* Some base target uses a special value for the null PID (exempli gratia
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remote). */
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static ptid_t base_magic_null_ptid;
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/* Ptid of the inferior as seen by the process stratum. */
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static ptid_t base_ptid;
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static const char running_thread_name[] = "__gnat_running_thread_table";
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static const char known_tasks_name[] = "system__tasking__debug__known_tasks";
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static const char first_task_name[] = "system__tasking__debug__first_task";
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static const char ravenscar_runtime_initializer[] =
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"system__bb__threads__initialize";
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static void ravenscar_update_thread_list (struct target_ops *ops);
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static ptid_t ravenscar_running_thread (void);
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static char *ravenscar_extra_thread_info (struct target_ops *self,
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struct thread_info *tp);
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static int ravenscar_thread_alive (struct target_ops *ops, ptid_t ptid);
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static void ravenscar_fetch_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum);
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static void ravenscar_store_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum);
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static void ravenscar_prepare_to_store (struct target_ops *self,
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struct regcache *regcache);
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static void ravenscar_resume (struct target_ops *ops, ptid_t ptid, int step,
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enum gdb_signal siggnal);
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static void ravenscar_mourn_inferior (struct target_ops *ops);
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static void ravenscar_update_inferior_ptid (void);
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static int has_ravenscar_runtime (void);
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static int ravenscar_runtime_initialized (void);
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static void ravenscar_inferior_created (struct target_ops *target,
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int from_tty);
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/* Fetch the ravenscar running thread from target memory and
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update inferior_ptid accordingly. */
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static void
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ravenscar_update_inferior_ptid (void)
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{
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base_ptid = inferior_ptid;
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/* If the runtime has not been initialized yet, the inferior_ptid is
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the only ptid that there is. */
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if (!ravenscar_runtime_initialized ())
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return;
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/* Make sure we set base_ptid before calling ravenscar_running_thread
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as the latter relies on it. */
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inferior_ptid = ravenscar_running_thread ();
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gdb_assert (!ptid_equal (inferior_ptid, null_ptid));
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/* The running thread may not have been added to
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system.tasking.debug's list yet; so ravenscar_update_thread_list
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may not always add it to the thread list. Add it here. */
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if (!find_thread_ptid (inferior_ptid))
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add_thread (inferior_ptid);
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}
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/* The Ravenscar Runtime exports a symbol which contains the ID of
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the thread that is currently running. Try to locate that symbol
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and return its associated minimal symbol.
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Return NULL if not found. */
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static struct bound_minimal_symbol
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get_running_thread_msymbol (void)
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{
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struct bound_minimal_symbol msym;
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msym = lookup_minimal_symbol (running_thread_name, NULL, NULL);
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if (!msym.minsym)
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/* Older versions of the GNAT runtime were using a different
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(less ideal) name for the symbol where the active thread ID
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is stored. If we couldn't find the symbol using the latest
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name, then try the old one. */
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msym = lookup_minimal_symbol ("running_thread", NULL, NULL);
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return msym;
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}
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/* Return True if the Ada Ravenscar run-time can be found in the
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application. */
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static int
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has_ravenscar_runtime (void)
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{
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struct bound_minimal_symbol msym_ravenscar_runtime_initializer =
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lookup_minimal_symbol (ravenscar_runtime_initializer, NULL, NULL);
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struct bound_minimal_symbol msym_known_tasks =
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lookup_minimal_symbol (known_tasks_name, NULL, NULL);
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struct bound_minimal_symbol msym_first_task =
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lookup_minimal_symbol (first_task_name, NULL, NULL);
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struct bound_minimal_symbol msym_running_thread
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= get_running_thread_msymbol ();
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return (msym_ravenscar_runtime_initializer.minsym
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&& (msym_known_tasks.minsym || msym_first_task.minsym)
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&& msym_running_thread.minsym);
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}
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/* Return True if the Ada Ravenscar run-time can be found in the
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application, and if it has been initialized on target. */
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static int
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ravenscar_runtime_initialized (void)
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{
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return (!(ptid_equal (ravenscar_running_thread (), null_ptid)));
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}
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/* Return the ID of the thread that is currently running.
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Return 0 if the ID could not be determined. */
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static CORE_ADDR
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get_running_thread_id (void)
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{
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struct bound_minimal_symbol object_msym = get_running_thread_msymbol ();
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int object_size;
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int buf_size;
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gdb_byte *buf;
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CORE_ADDR object_addr;
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struct type *builtin_type_void_data_ptr =
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builtin_type (target_gdbarch ())->builtin_data_ptr;
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if (!object_msym.minsym)
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return 0;
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object_addr = BMSYMBOL_VALUE_ADDRESS (object_msym);
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object_size = TYPE_LENGTH (builtin_type_void_data_ptr);
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buf_size = object_size;
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buf = (gdb_byte *) alloca (buf_size);
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read_memory (object_addr, buf, buf_size);
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return extract_typed_address (buf, builtin_type_void_data_ptr);
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}
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static void
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ravenscar_resume (struct target_ops *ops, ptid_t ptid, int step,
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enum gdb_signal siggnal)
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{
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struct target_ops *beneath = find_target_beneath (ops);
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inferior_ptid = base_ptid;
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beneath->to_resume (beneath, base_ptid, step, siggnal);
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}
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static ptid_t
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ravenscar_wait (struct target_ops *ops, ptid_t ptid,
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struct target_waitstatus *status,
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int options)
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{
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struct target_ops *beneath = find_target_beneath (ops);
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inferior_ptid = base_ptid;
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beneath->to_wait (beneath, base_ptid, status, 0);
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/* Find any new threads that might have been created, and update
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inferior_ptid to the active thread.
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Only do it if the program is still alive, though. Otherwise,
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this causes problems when debugging through the remote protocol,
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because we might try switching threads (and thus sending packets)
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after the remote has disconnected. */
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if (status->kind != TARGET_WAITKIND_EXITED
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&& status->kind != TARGET_WAITKIND_SIGNALLED)
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{
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ravenscar_update_thread_list (ops);
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ravenscar_update_inferior_ptid ();
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}
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return inferior_ptid;
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}
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/* Add the thread associated to the given TASK to the thread list
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(if the thread has already been added, this is a no-op). */
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static void
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ravenscar_add_thread (struct ada_task_info *task)
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{
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if (find_thread_ptid (task->ptid) == NULL)
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add_thread (task->ptid);
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}
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static void
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ravenscar_update_thread_list (struct target_ops *ops)
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{
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ada_build_task_list ();
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/* Do not clear the thread list before adding the Ada task, to keep
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the thread that the process stratum has included into it
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(base_ptid) and the running thread, that may not have been included
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to system.tasking.debug's list yet. */
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iterate_over_live_ada_tasks (ravenscar_add_thread);
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}
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static ptid_t
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ravenscar_running_thread (void)
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{
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CORE_ADDR tid = get_running_thread_id ();
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if (tid == 0)
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return null_ptid;
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else
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return ptid_build (ptid_get_pid (base_ptid), 0, tid);
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}
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static char *
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ravenscar_extra_thread_info (struct target_ops *self, struct thread_info *tp)
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{
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return "Ravenscar task";
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}
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static int
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ravenscar_thread_alive (struct target_ops *ops, ptid_t ptid)
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{
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/* Ravenscar tasks are non-terminating. */
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return 1;
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}
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static char *
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ravenscar_pid_to_str (struct target_ops *ops, ptid_t ptid)
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{
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static char buf[30];
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snprintf (buf, sizeof (buf), "Thread %#x", (int) ptid_get_tid (ptid));
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return buf;
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}
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static void
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ravenscar_fetch_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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struct target_ops *beneath = find_target_beneath (ops);
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if (!ravenscar_runtime_initialized ()
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|| ptid_equal (inferior_ptid, base_magic_null_ptid)
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|| ptid_equal (inferior_ptid, ravenscar_running_thread ()))
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beneath->to_fetch_registers (beneath, regcache, regnum);
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else
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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struct ravenscar_arch_ops *arch_ops
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= gdbarch_ravenscar_ops (gdbarch);
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arch_ops->to_fetch_registers (regcache, regnum);
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}
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}
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static void
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ravenscar_store_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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struct target_ops *beneath = find_target_beneath (ops);
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if (!ravenscar_runtime_initialized ()
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|| ptid_equal (inferior_ptid, base_magic_null_ptid)
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|| ptid_equal (inferior_ptid, ravenscar_running_thread ()))
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beneath->to_store_registers (beneath, regcache, regnum);
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else
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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struct ravenscar_arch_ops *arch_ops
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= gdbarch_ravenscar_ops (gdbarch);
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arch_ops->to_store_registers (regcache, regnum);
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}
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}
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static void
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ravenscar_prepare_to_store (struct target_ops *self,
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struct regcache *regcache)
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{
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struct target_ops *beneath = find_target_beneath (self);
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if (!ravenscar_runtime_initialized ()
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|| ptid_equal (inferior_ptid, base_magic_null_ptid)
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|| ptid_equal (inferior_ptid, ravenscar_running_thread ()))
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beneath->to_prepare_to_store (beneath, regcache);
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else
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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struct ravenscar_arch_ops *arch_ops
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= gdbarch_ravenscar_ops (gdbarch);
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arch_ops->to_prepare_to_store (regcache);
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}
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}
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static void
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ravenscar_mourn_inferior (struct target_ops *ops)
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{
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struct target_ops *beneath = find_target_beneath (ops);
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base_ptid = null_ptid;
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beneath->to_mourn_inferior (beneath);
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unpush_target (&ravenscar_ops);
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}
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/* Observer on inferior_created: push ravenscar thread stratum if needed. */
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static void
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ravenscar_inferior_created (struct target_ops *target, int from_tty)
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{
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if (!ravenscar_task_support
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|| gdbarch_ravenscar_ops (target_gdbarch ()) == NULL
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|| !has_ravenscar_runtime ())
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return;
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base_magic_null_ptid = inferior_ptid;
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ravenscar_update_inferior_ptid ();
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push_target (&ravenscar_ops);
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}
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static ptid_t
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ravenscar_get_ada_task_ptid (struct target_ops *self, long lwp, long thread)
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{
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return ptid_build (ptid_get_pid (base_ptid), 0, thread);
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}
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static void
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init_ravenscar_thread_ops (void)
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{
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ravenscar_ops.to_shortname = "ravenscar";
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ravenscar_ops.to_longname = "Ravenscar tasks.";
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ravenscar_ops.to_doc = "Ravenscar tasks support.";
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ravenscar_ops.to_resume = ravenscar_resume;
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ravenscar_ops.to_wait = ravenscar_wait;
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ravenscar_ops.to_fetch_registers = ravenscar_fetch_registers;
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ravenscar_ops.to_store_registers = ravenscar_store_registers;
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ravenscar_ops.to_prepare_to_store = ravenscar_prepare_to_store;
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ravenscar_ops.to_thread_alive = ravenscar_thread_alive;
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ravenscar_ops.to_update_thread_list = ravenscar_update_thread_list;
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ravenscar_ops.to_pid_to_str = ravenscar_pid_to_str;
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ravenscar_ops.to_extra_thread_info = ravenscar_extra_thread_info;
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ravenscar_ops.to_get_ada_task_ptid = ravenscar_get_ada_task_ptid;
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ravenscar_ops.to_mourn_inferior = ravenscar_mourn_inferior;
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ravenscar_ops.to_has_all_memory = default_child_has_all_memory;
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ravenscar_ops.to_has_memory = default_child_has_memory;
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ravenscar_ops.to_has_stack = default_child_has_stack;
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ravenscar_ops.to_has_registers = default_child_has_registers;
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ravenscar_ops.to_has_execution = default_child_has_execution;
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ravenscar_ops.to_stratum = thread_stratum;
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ravenscar_ops.to_magic = OPS_MAGIC;
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}
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/* Command-list for the "set/show ravenscar" prefix command. */
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static struct cmd_list_element *set_ravenscar_list;
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static struct cmd_list_element *show_ravenscar_list;
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/* Implement the "set ravenscar" prefix command. */
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static void
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set_ravenscar_command (char *arg, int from_tty)
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{
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printf_unfiltered (_(\
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"\"set ravenscar\" must be followed by the name of a setting.\n"));
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help_list (set_ravenscar_list, "set ravenscar ", all_commands, gdb_stdout);
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}
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/* Implement the "show ravenscar" prefix command. */
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static void
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show_ravenscar_command (char *args, int from_tty)
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{
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cmd_show_list (show_ravenscar_list, from_tty, "");
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}
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/* Implement the "show ravenscar task-switching" command. */
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static void
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show_ravenscar_task_switching_command (struct ui_file *file, int from_tty,
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struct cmd_list_element *c,
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const char *value)
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{
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if (ravenscar_task_support)
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fprintf_filtered (file, _("\
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Support for Ravenscar task/thread switching is enabled\n"));
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else
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fprintf_filtered (file, _("\
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Support for Ravenscar task/thread switching is disabled\n"));
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern void _initialize_ravenscar (void);
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/* Module startup initialization function, automagically called by
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init.c. */
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void
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_initialize_ravenscar (void)
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{
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init_ravenscar_thread_ops ();
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base_ptid = null_ptid;
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/* Notice when the inferior is created in order to push the
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ravenscar ops if needed. */
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observer_attach_inferior_created (ravenscar_inferior_created);
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complete_target_initialization (&ravenscar_ops);
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add_prefix_cmd ("ravenscar", no_class, set_ravenscar_command,
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_("Prefix command for changing Ravenscar-specific settings"),
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&set_ravenscar_list, "set ravenscar ", 0, &setlist);
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add_prefix_cmd ("ravenscar", no_class, show_ravenscar_command,
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_("Prefix command for showing Ravenscar-specific settings"),
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&show_ravenscar_list, "show ravenscar ", 0, &showlist);
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add_setshow_boolean_cmd ("task-switching", class_obscure,
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&ravenscar_task_support, _("\
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Enable or disable support for GNAT Ravenscar tasks"), _("\
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Show whether support for GNAT Ravenscar tasks is enabled"),
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_("\
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Enable or disable support for task/thread switching with the GNAT\n\
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Ravenscar run-time library for bareboard configuration."),
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NULL, show_ravenscar_task_switching_command,
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&set_ravenscar_list, &show_ravenscar_list);
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}
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