[PATCH 2/2] Add support for GNAT Ravenscar run-time library.
Joel Brobecker
brobecker@adacore.com
Thu Sep 23 19:49:00 GMT 2010
gdb/ChangeLog (Jerome Guitton, Joel Brobecker):
* ravenscar-thread.c, ravenscar-thread.h, ravenscar-sparc-thread.c:
New files.
* configure.tgt (sparc-*-*): Add ravenscar-thread.o and
ravenscar-sparc-thread.o to gdb_target_obs.
---
gdb/configure.tgt | 3 +-
gdb/ravenscar-sparc-thread.c | 184 +++++++++++++++++++
gdb/ravenscar-thread.c | 409 ++++++++++++++++++++++++++++++++++++++++++
gdb/ravenscar-thread.h | 41 +++++
4 files changed, 636 insertions(+), 1 deletions(-)
create mode 100644 gdb/ravenscar-sparc-thread.c
create mode 100644 gdb/ravenscar-thread.c
create mode 100644 gdb/ravenscar-thread.h
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index 0b44005..80cfb49 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -521,7 +521,8 @@ sparc-*-rtems*)
;;
sparc-*-*)
# Target: SPARC
- gdb_target_obs="sparc-tdep.o"
+ gdb_target_obs="sparc-tdep.o ravenscar-thread.o \
+ ravenscar-sparc-thread.o"
;;
sparc64-*-*)
# Target: UltraSPARC
diff --git a/gdb/ravenscar-sparc-thread.c b/gdb/ravenscar-sparc-thread.c
new file mode 100644
index 0000000..df2fa2d
--- /dev/null
+++ b/gdb/ravenscar-sparc-thread.c
@@ -0,0 +1,184 @@
+/* Ravenscar SPARC target support.
+
+ Copyright 2004, 2010 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "regcache.h"
+#include "sparc-tdep.h"
+#include "inferior.h"
+#include "ravenscar-thread.h"
+
+static struct ravenscar_arch_ops ravenscar_sparc_ops;
+
+static void ravenscar_sparc_fetch_registers (struct regcache *regcache,
+ int regnum);
+static void ravenscar_sparc_store_registers (struct regcache *regcache,
+ int regnum);
+static void ravenscar_sparc_prepare_to_store (struct regcache *regcache);
+
+/* Register offsets from a referenced address (exempli gratia the
+ Thread_Descriptor). The referenced address depends on the register
+ number. The Thread_Descriptor layout and the stack layout are documented
+ in the GNAT sources, in sparc-bb.h. */
+
+static const int sparc_register_offsets[] =
+{
+ /* G0 - G7 */
+ -1, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
+ /* O0 - O7 */
+ 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
+ /* L0 - L7 */
+ 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
+ /* I0 - I7 */
+ 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
+ /* F0 - F31 */
+ 0x50, 0x54, 0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C,
+ 0x70, 0x74, 0x78, 0x7C, 0x80, 0x84, 0x88, 0x8C,
+ 0x90, 0x94, 0x99, 0x9C, 0xA0, 0xA4, 0xA8, 0xAC,
+ 0xB0, 0xB4, 0xBB, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC,
+ /* Y PSR WIM TBR PC NPC FPSR CPSR */
+ 0x40, 0x20, 0x44, -1, 0x1C, -1, 0x4C, -1
+};
+
+/* supply register REGNUM, which has been saved on REGISTER_ADDR, to the
+ regcache. */
+
+static void
+supply_register_at_address (struct regcache *regcache, int regnum,
+ CORE_ADDR register_addr)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ int buf_size = register_size (gdbarch, regnum);
+ char buf [buf_size];
+
+ read_memory (register_addr, buf, buf_size);
+ regcache_raw_supply (regcache, regnum, &buf);
+}
+
+/* Return true if, for a non-running thread, REGNUM has been saved on the
+ stack. */
+
+static int
+register_on_stack_p (int regnum)
+{
+ return (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
+ || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM);
+}
+
+/* Return true if, for a non-running thread, REGNUM has been saved on the
+ Thread_Descriptor. */
+
+static int
+register_in_thread_descriptor_p (int regnum)
+{
+ return (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
+ || (regnum == SPARC32_PSR_REGNUM)
+ || (regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
+ || (regnum == SPARC32_Y_REGNUM)
+ || (regnum == SPARC32_WIM_REGNUM)
+ || (regnum == SPARC32_FSR_REGNUM)
+ || (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F0_REGNUM + 31)
+ || (regnum == SPARC32_PC_REGNUM);
+}
+
+/* to_fetch_registers when inferior_ptid is different from the running
+ thread. */
+
+static void
+ravenscar_sparc_fetch_registers (struct regcache *regcache, int regnum)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ const int sp_regnum = gdbarch_sp_regnum (gdbarch);
+ const int num_regs = gdbarch_num_regs (gdbarch);
+ int current_regnum;
+ CORE_ADDR current_address;
+ CORE_ADDR thread_descriptor_address;
+ ULONGEST stack_address;
+
+ thread_descriptor_address = (CORE_ADDR) ptid_get_tid (inferior_ptid);
+ current_address = thread_descriptor_address
+ + sparc_register_offsets [sp_regnum];
+ supply_register_at_address (regcache, sp_regnum, current_address);
+ regcache_cooked_read_unsigned (regcache, sp_regnum, &stack_address);
+
+ for (current_regnum = 0; current_regnum < num_regs; current_regnum ++)
+ {
+ if (register_in_thread_descriptor_p (current_regnum))
+ {
+ current_address = thread_descriptor_address
+ + sparc_register_offsets [current_regnum];
+ supply_register_at_address (regcache, current_regnum,
+ current_address);
+ }
+ else if (register_on_stack_p (current_regnum))
+ {
+ current_address = stack_address
+ + sparc_register_offsets [current_regnum];
+ supply_register_at_address (regcache, current_regnum,
+ current_address);
+ }
+ }
+}
+
+/* to_prepare_to_store when inferior_ptid is different from the running
+ thread. */
+
+static void
+ravenscar_sparc_prepare_to_store (struct regcache *regcache)
+{
+ /* Nothing to do. */
+}
+
+/* to_store_registers when inferior_ptid is different from the running
+ thread. */
+
+static void
+ravenscar_sparc_store_registers (struct regcache *regcache, int regnum)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ int buf_size = register_size (gdbarch, regnum);
+ char buf [buf_size];
+ ULONGEST register_address;
+
+ if (register_in_thread_descriptor_p (regnum))
+ register_address =
+ ptid_get_tid (inferior_ptid) + sparc_register_offsets [regnum];
+ else if (register_on_stack_p (regnum))
+ {
+ regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM,
+ ®ister_address);
+ register_address += sparc_register_offsets [regnum];
+ }
+ else
+ return;
+
+ regcache_raw_collect (regcache, regnum, buf);
+ write_memory (register_address,
+ buf,
+ buf_size);
+}
+
+void
+_initialize_ravenscar_sparc (void)
+{
+ ravenscar_sparc_ops.to_fetch_registers = ravenscar_sparc_fetch_registers;
+ ravenscar_sparc_ops.to_store_registers = ravenscar_sparc_store_registers;
+ ravenscar_sparc_ops.to_prepare_to_store = ravenscar_sparc_prepare_to_store;
+ ravenscar_register_arch_ops (&ravenscar_sparc_ops);
+}
diff --git a/gdb/ravenscar-thread.c b/gdb/ravenscar-thread.c
new file mode 100644
index 0000000..55f8a93
--- /dev/null
+++ b/gdb/ravenscar-thread.c
@@ -0,0 +1,409 @@
+/* Ada Ravenscar thread support.
+
+ Copyright 2004, 2009, 2010 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "gdbthread.h"
+#include "ada-lang.h"
+#include "target.h"
+#include "inferior.h"
+#include "command.h"
+#include "ravenscar-thread.h"
+#include "observer.h"
+#include "gdb_string.h"
+#include "gdbcmd.h"
+#include "top.h"
+#include "regcache.h"
+
+/* If non-null, ravenscar task support is enabled. */
+static int ravenscar_task_support = 1;
+
+/* This module's target-specific operations. */
+static struct target_ops ravenscar_ops;
+
+/* Some base target uses a special value for the null PID (exempli gratia
+ remote). */
+static ptid_t base_magic_null_ptid;
+
+/* Ptid of the inferior as seen by the process stratum. */
+static ptid_t base_ptid;
+
+static const char *running_thread_name = "running_thread";
+
+static const char *known_tasks_name = "system__tasking__debug__known_tasks";
+
+static const char *ravenscar_runtime_initializer =
+"system__bb__threads__initialize";
+
+static struct observer *update_target_observer = NULL;
+
+/* Architecture-specific hooks. */
+static struct ravenscar_arch_ops* current_arch_ops;
+
+static CORE_ADDR read_thread_id (const char* symbol_name);
+
+static void ravenscar_find_new_threads (struct target_ops *ops);
+static ptid_t ravenscar_running_thread (void);
+static char * ravenscar_extra_thread_info (struct thread_info *tp);
+static int ravenscar_thread_alive (struct target_ops *ops, ptid_t ptid);
+static void ravenscar_fetch_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum);
+static void ravenscar_store_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum);
+static void ravenscar_prepare_to_store (struct regcache *regcache);
+static void ravenscar_initialize (char *name, int from_tty);
+static void ravenscar_resume (struct target_ops *ops, ptid_t ptid, int step,
+ enum target_signal siggnal);
+static void ravenscar_mourn_inferior (struct target_ops *ops);
+static void ravenscar_update_inferior_ptid (void);
+static int has_ravenscar_runtime (void);
+static int ravenscar_runtime_initialized (void);
+static void ravenscar_inferior_created (struct target_ops *target,
+ int from_tty);
+
+/* Fetch the ravenscar running thread from target memory and
+ update inferior_ptid accordingly. */
+
+static void
+ravenscar_update_inferior_ptid (void)
+{
+ base_ptid = inferior_ptid;
+
+ /* If the runtime has not been initialized yet, the inferior_ptid is
+ the only ptid that there is. */
+ if (!ravenscar_runtime_initialized ())
+ return;
+
+ /* Make sure we set base_ptid before calling ravenscar_running_thread
+ as the latter relies on it. */
+ inferior_ptid = ravenscar_running_thread ();
+ gdb_assert (!ptid_equal (inferior_ptid, null_ptid));
+
+ /* The running thread may not have been added to
+ system.tasking.debug's list yet; so ravenscar_find_new_threads
+ may not always add it to the thread list. Add it here. */
+ if (!find_thread_ptid (inferior_ptid))
+ add_thread (inferior_ptid);
+}
+
+/* Return True if the Ada Ravenscar run-time can be found in the
+ application. */
+
+static int
+has_ravenscar_runtime (void)
+{
+ struct minimal_symbol *msym_ravenscar_runtime_initializer =
+ lookup_minimal_symbol (ravenscar_runtime_initializer, NULL, NULL);
+ struct minimal_symbol *msym_known_tasks =
+ lookup_minimal_symbol (known_tasks_name, NULL, NULL);
+ struct minimal_symbol *msym_running_thread =
+ lookup_minimal_symbol (running_thread_name, NULL, NULL);
+
+ return (msym_ravenscar_runtime_initializer
+ && msym_known_tasks
+ && msym_running_thread);
+}
+
+/* Return True if the Ada Ravenscar run-time can be found in the
+ application, and if it has been initialized on target. */
+
+static int
+ravenscar_runtime_initialized (void)
+{
+ return (!(ptid_equal (ravenscar_running_thread (), null_ptid)));
+}
+
+/* Read the thread ID whose symbol name is SYMBOL_NAME. */
+
+static CORE_ADDR
+read_thread_id (const char* symbol_name)
+{
+ const struct minimal_symbol *object_msym =
+ lookup_minimal_symbol (symbol_name, NULL, NULL);
+ int object_size;
+ int buf_size;
+ char* buf;
+ CORE_ADDR object_addr;
+ struct type *builtin_type_void_data_ptr =
+ builtin_type (target_gdbarch)->builtin_data_ptr;
+
+ if (!object_msym)
+ return 0;
+
+ object_addr = SYMBOL_VALUE_ADDRESS (object_msym);
+ object_size = TYPE_LENGTH (builtin_type_void_data_ptr);
+ buf_size = object_size;
+ buf = alloca (buf_size);
+ read_memory (object_addr, buf, buf_size);
+ return extract_typed_address (buf, builtin_type_void_data_ptr);
+}
+
+static ptid_t
+ravenscar_wait (struct target_ops *ops, ptid_t ptid,
+ struct target_waitstatus *status,
+ int options)
+{
+ struct target_ops *beneath = find_target_beneath (ops);
+
+ inferior_ptid = base_ptid;
+ beneath->to_wait (ops, base_ptid, status, 0);
+ ravenscar_find_new_threads (ops);
+ ravenscar_update_inferior_ptid ();
+ return inferior_ptid;
+}
+
+static void
+ravenscar_resume (struct target_ops *ops, ptid_t ptid, int step,
+ enum target_signal siggnal)
+{
+ struct target_ops *beneath = find_target_beneath (ops);
+
+ inferior_ptid = base_ptid;
+ beneath->to_resume (ops, base_ptid, step, siggnal);
+}
+
+/* Add the thread associated to the given TASK to the thread list
+ (if the thread has already been added, this is a no-op). */
+
+static void
+ravenscar_add_thread (struct ada_task_info *task)
+{
+ if (find_thread_ptid (task->ptid) == NULL)
+ add_thread (task->ptid);
+}
+
+static void
+ravenscar_find_new_threads (struct target_ops *ops)
+{
+ ada_build_task_list (0);
+
+ /* Do not clear the thread list before adding the Ada task, to keep
+ the thread that the process stratum has included into it
+ (base_ptid) and the running thread, that may not have been included
+ to system.tasking.debug's list yet. */
+
+ iterate_over_live_ada_tasks (ravenscar_add_thread);
+}
+
+static ptid_t
+ravenscar_running_thread (void)
+{
+ CORE_ADDR tid = read_thread_id (running_thread_name);
+
+ if (tid == 0)
+ return null_ptid;
+ else
+ return ptid_build (ptid_get_pid (base_ptid), 0, tid);
+}
+
+static char *
+ravenscar_extra_thread_info (struct thread_info *tp)
+{
+ return "Ravenscar task";
+}
+
+static int
+ravenscar_thread_alive (struct target_ops *ops, ptid_t ptid)
+{
+ /* Ravenscar tasks are non-terminating. */
+ return 1;
+}
+
+static char *
+ravenscar_pid_to_str (struct target_ops *ops, ptid_t ptid)
+{
+ static char buf[30];
+
+ snprintf (buf, sizeof (buf), "Thread %#x", (int) ptid_get_tid (ptid));
+ return buf;
+}
+
+static void
+ravenscar_fetch_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum)
+{
+ struct target_ops *beneath = find_target_beneath (ops);
+
+ if (!ravenscar_runtime_initialized ()
+ || ptid_equal (inferior_ptid, base_magic_null_ptid)
+ || ptid_equal (inferior_ptid, ravenscar_running_thread ()))
+ beneath->to_fetch_registers (ops, regcache, regnum);
+ else
+ current_arch_ops->to_fetch_registers (regcache, regnum);
+}
+
+static void
+ravenscar_store_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum)
+{
+ struct target_ops *beneath = find_target_beneath (ops);
+
+ if (!ravenscar_runtime_initialized ()
+ || ptid_equal (inferior_ptid, base_magic_null_ptid)
+ || ptid_equal (inferior_ptid, ravenscar_running_thread ()))
+ beneath->to_store_registers (ops, regcache, regnum);
+ else
+ current_arch_ops->to_store_registers (regcache, regnum);
+}
+
+static void
+ravenscar_prepare_to_store (struct regcache *regcache)
+{
+ struct target_ops *beneath = find_target_beneath (&ravenscar_ops);
+
+ if (!ravenscar_runtime_initialized ()
+ || ptid_equal (inferior_ptid, base_magic_null_ptid)
+ || ptid_equal (inferior_ptid, ravenscar_running_thread ()))
+ beneath->to_prepare_to_store (regcache);
+ else
+ current_arch_ops->to_prepare_to_store (regcache);
+}
+
+static void
+ravenscar_mourn_inferior (struct target_ops *ops)
+{
+ struct target_ops *beneath = find_target_beneath (&ravenscar_ops);
+
+ base_ptid = null_ptid;
+ beneath->to_mourn_inferior (beneath);
+ unpush_target (&ravenscar_ops);
+}
+
+/* Observer on inferior_created: push ravenscar thread stratum if needed. */
+
+static void
+ravenscar_inferior_created (struct target_ops *target, int from_tty)
+{
+ if (ravenscar_task_support
+ && has_ravenscar_runtime ()
+ && strcmp (target_shortname, ravenscar_ops.to_shortname) != 0)
+ ravenscar_initialize (NULL, 0);
+}
+
+void
+ravenscar_register_arch_ops (struct ravenscar_arch_ops *ops)
+{
+ /* FIXME: To be clean, we would need to handle a list of
+ architectures, just like in remote-wtx-hw.c. However, for now the
+ only Ravenscar run-time for bare board that is implemented in
+ GNAT is for only one architecture: erc32-elf. So no need to care about
+ that for now...*/
+ current_arch_ops = ops;
+}
+
+/* Initialize Ravenscar support. */
+
+static void
+ravenscar_initialize (char *name, int from_tty)
+{
+ base_magic_null_ptid = inferior_ptid;
+ ravenscar_update_inferior_ptid ();
+ push_target (&ravenscar_ops);
+}
+
+static ptid_t
+ravenscar_get_ada_task_ptid (long lwp, long thread)
+{
+ return ptid_build (ptid_get_pid (base_ptid), 0, thread);
+}
+
+static void
+init_ravenscar_thread_ops (void)
+{
+ ravenscar_ops.to_shortname = "ravenscar";
+ ravenscar_ops.to_longname = "Ravenscar tasks.";
+ ravenscar_ops.to_doc = "Ravenscar tasks support.";
+ ravenscar_ops.to_wait = ravenscar_wait;
+ ravenscar_ops.to_resume = ravenscar_resume;
+ ravenscar_ops.to_fetch_registers = ravenscar_fetch_registers;
+ ravenscar_ops.to_store_registers = ravenscar_store_registers;
+ ravenscar_ops.to_prepare_to_store = ravenscar_prepare_to_store;
+ ravenscar_ops.to_thread_alive = ravenscar_thread_alive;
+ ravenscar_ops.to_find_new_threads = ravenscar_find_new_threads;
+ ravenscar_ops.to_pid_to_str = ravenscar_pid_to_str;
+ ravenscar_ops.to_extra_thread_info = ravenscar_extra_thread_info;
+ ravenscar_ops.to_get_ada_task_ptid = ravenscar_get_ada_task_ptid;
+ ravenscar_ops.to_mourn_inferior = ravenscar_mourn_inferior;
+ ravenscar_ops.to_has_all_memory = default_child_has_all_memory;
+ ravenscar_ops.to_has_memory = default_child_has_memory;
+ ravenscar_ops.to_has_stack = default_child_has_stack;
+ ravenscar_ops.to_has_registers = default_child_has_registers;
+ ravenscar_ops.to_has_execution = default_child_has_execution;
+ ravenscar_ops.to_stratum = thread_stratum;
+ ravenscar_ops.to_magic = OPS_MAGIC;
+}
+
+
+/* Command-list for the "set/show ravenscar" prefix command. */
+static struct cmd_list_element *set_ravenscar_list;
+static struct cmd_list_element *show_ravenscar_list;
+
+/* Implement the "set ravenscar" prefix command. */
+
+static void
+set_ravenscar_command (char *arg, int from_tty)
+{
+ printf_unfiltered (_(\
+"\"set ravenscar\" must be followed by the name of a setting.\n"));
+ help_list (set_ravenscar_list, "set ravenscar ", -1, gdb_stdout);
+}
+
+/* Implement the "show ravenscar" prefix command. */
+
+static void
+show_ravenscar_command (char *args, int from_tty)
+{
+ cmd_show_list (show_ravenscar_list, from_tty, "");
+}
+
+/* Module startup initialization function, automagically called by
+ init.c. */
+
+void
+_initialize_ravenscar (void)
+{
+ extern struct cmd_list_element *cmdlist;
+
+ init_ravenscar_thread_ops ();
+ base_ptid = null_ptid;
+
+ /* Notice when the inferior is created in order to push the
+ ravenscar ops if needed. */
+ observer_attach_inferior_created (ravenscar_inferior_created);
+
+ add_target (&ravenscar_ops);
+
+ add_prefix_cmd ("ravenscar", no_class, set_ravenscar_command,
+ _("Prefix command for changing Ravenscar-specific settings"),
+ &set_ravenscar_list, "set ravenscar ", 0, &setlist);
+
+ add_prefix_cmd ("ravenscar", no_class, show_ravenscar_command,
+ _("Prefix command for showing Ravenscar-specific settings"),
+ &show_ravenscar_list, "set ravenscar ", 0, &showlist);
+
+ add_setshow_boolean_cmd ("task-switching", class_obscure,
+ &ravenscar_task_support, _("\
+Enable or disable support for GNAT Ravenscar tasks"), _("\
+Show whether supported for GNAT Ravenscar tasks is enabled"),
+ _("\
+Enable or disable support for task/thread switching\n\
+with the GNAT Ravenscar run-time lib for bareboard configuration."),
+ NULL, NULL, &set_ravenscar_list,
+ &show_ravenscar_list);
+}
diff --git a/gdb/ravenscar-thread.h b/gdb/ravenscar-thread.h
new file mode 100644
index 0000000..c8844e3
--- /dev/null
+++ b/gdb/ravenscar-thread.h
@@ -0,0 +1,41 @@
+/* Ada Ravenscar thread support.
+
+ Copyright 2004, 2010 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef RAVENSCAR_THREAD_H
+#define RAVENSCAR_THREAD_H
+
+/* Architecture-specific hooks. */
+
+struct ravenscar_arch_ops
+{
+ void (*to_fetch_registers) (struct regcache *, int);
+ void (*to_store_registers) (struct regcache *, int);
+ void (*to_prepare_to_store) (struct regcache *);
+};
+
+/* Register implementations for target ops to_store_registers,
+ to_prepare_to_store and to_fetch_registers when the inferior_ptid
+ is different from the running thread. In that case, the registers
+ are saved in a architecture-specific location. */
+/* FIXME: only one architecture can be registered for now. See
+ implementation. */
+
+extern void ravenscar_register_arch_ops (struct ravenscar_arch_ops *ops);
+
+#endif /* !defined (RAVENSCAR_THREAD_H) */
--
1.7.1
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