| /* Target operations for the remote server for GDB. |
| Copyright (C) 2002-2016 Free Software Foundation, Inc. |
| |
| Contributed by MontaVista Software. |
| |
| 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 "server.h" |
| #include "tracepoint.h" |
| |
| struct target_ops *the_target; |
| |
| int |
| set_desired_thread (int use_general) |
| { |
| struct thread_info *found; |
| |
| if (use_general == 1) |
| found = find_thread_ptid (general_thread); |
| else |
| found = find_thread_ptid (cont_thread); |
| |
| current_thread = found; |
| return (current_thread != NULL); |
| } |
| |
| /* Structure used to look up a thread to use as current when accessing |
| memory. */ |
| |
| struct thread_search |
| { |
| /* The PTID of the current general thread. This is an input |
| parameter. */ |
| ptid_t current_gen_ptid; |
| |
| /* The first thread found. */ |
| struct thread_info *first; |
| |
| /* The first stopped thread found. */ |
| struct thread_info *stopped; |
| |
| /* The current general thread, if found. */ |
| struct thread_info *current; |
| }; |
| |
| /* Callback for find_inferior. Search for a thread to use as current |
| when accessing memory. */ |
| |
| static int |
| thread_search_callback (struct inferior_list_entry *entry, void *args) |
| { |
| struct thread_info *thread = (struct thread_info *) entry; |
| struct thread_search *s = (struct thread_search *) args; |
| |
| if (ptid_get_pid (entry->id) == ptid_get_pid (s->current_gen_ptid) |
| && mythread_alive (ptid_of (thread))) |
| { |
| if (s->stopped == NULL |
| && the_target->thread_stopped != NULL |
| && thread_stopped (thread)) |
| s->stopped = thread; |
| |
| if (s->first == NULL) |
| s->first = thread; |
| |
| if (s->current == NULL && ptid_equal (s->current_gen_ptid, entry->id)) |
| s->current = thread; |
| } |
| |
| return 0; |
| } |
| |
| /* The thread that was current before prepare_to_access_memory was |
| called. done_accessing_memory uses this to restore the previous |
| selected thread. */ |
| static ptid_t prev_general_thread; |
| |
| /* See target.h. */ |
| |
| int |
| prepare_to_access_memory (void) |
| { |
| struct thread_search search; |
| struct thread_info *thread; |
| |
| memset (&search, 0, sizeof (search)); |
| search.current_gen_ptid = general_thread; |
| prev_general_thread = general_thread; |
| |
| if (the_target->prepare_to_access_memory != NULL) |
| { |
| int res; |
| |
| res = the_target->prepare_to_access_memory (); |
| if (res != 0) |
| return res; |
| } |
| |
| find_inferior (&all_threads, thread_search_callback, &search); |
| |
| /* Prefer a stopped thread. If none is found, try the current |
| thread. Otherwise, take the first thread in the process. If |
| none is found, undo the effects of |
| target->prepare_to_access_memory() and return error. */ |
| if (search.stopped != NULL) |
| thread = search.stopped; |
| else if (search.current != NULL) |
| thread = search.current; |
| else if (search.first != NULL) |
| thread = search.first; |
| else |
| { |
| done_accessing_memory (); |
| return 1; |
| } |
| |
| current_thread = thread; |
| general_thread = ptid_of (thread); |
| |
| return 0; |
| } |
| |
| /* See target.h. */ |
| |
| void |
| done_accessing_memory (void) |
| { |
| if (the_target->done_accessing_memory != NULL) |
| the_target->done_accessing_memory (); |
| |
| /* Restore the previous selected thread. */ |
| general_thread = prev_general_thread; |
| current_thread = find_thread_ptid (general_thread); |
| } |
| |
| int |
| read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
| { |
| int res; |
| res = (*the_target->read_memory) (memaddr, myaddr, len); |
| check_mem_read (memaddr, myaddr, len); |
| return res; |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| { |
| return read_inferior_memory (memaddr, myaddr, len); |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) |
| { |
| return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result)); |
| } |
| |
| int |
| write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
| int len) |
| { |
| /* Lacking cleanups, there is some potential for a memory leak if the |
| write fails and we go through error(). Make sure that no more than |
| one buffer is ever pending by making BUFFER static. */ |
| static unsigned char *buffer = 0; |
| int res; |
| |
| if (buffer != NULL) |
| free (buffer); |
| |
| buffer = (unsigned char *) xmalloc (len); |
| memcpy (buffer, myaddr, len); |
| check_mem_write (memaddr, buffer, myaddr, len); |
| res = (*the_target->write_memory) (memaddr, buffer, len); |
| free (buffer); |
| buffer = NULL; |
| |
| return res; |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) |
| { |
| return write_inferior_memory (memaddr, myaddr, len); |
| } |
| |
| ptid_t |
| mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options, |
| int connected_wait) |
| { |
| ptid_t ret; |
| |
| if (connected_wait) |
| server_waiting = 1; |
| |
| ret = target_wait (ptid, ourstatus, options); |
| |
| /* We don't expose _LOADED events to gdbserver core. See the |
| `dlls_changed' global. */ |
| if (ourstatus->kind == TARGET_WAITKIND_LOADED) |
| ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| |
| /* If GDB is connected through TCP/serial, then GDBserver will most |
| probably be running on its own terminal/console, so it's nice to |
| print there why is GDBserver exiting. If however, GDB is |
| connected through stdio, then there's no need to spam the GDB |
| console with this -- the user will already see the exit through |
| regular GDB output, in that same terminal. */ |
| if (!remote_connection_is_stdio ()) |
| { |
| if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
| fprintf (stderr, |
| "\nChild exited with status %d\n", ourstatus->value.integer); |
| else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
| fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", |
| gdb_signal_to_host (ourstatus->value.sig), |
| gdb_signal_to_name (ourstatus->value.sig)); |
| } |
| |
| if (connected_wait) |
| server_waiting = 0; |
| |
| return ret; |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_stop_and_wait (ptid_t ptid) |
| { |
| struct target_waitstatus status; |
| int was_non_stop = non_stop; |
| struct thread_resume resume_info; |
| |
| resume_info.thread = ptid; |
| resume_info.kind = resume_stop; |
| resume_info.sig = GDB_SIGNAL_0; |
| (*the_target->resume) (&resume_info, 1); |
| |
| non_stop = 1; |
| mywait (ptid, &status, 0, 0); |
| non_stop = was_non_stop; |
| } |
| |
| /* See target/target.h. */ |
| |
| ptid_t |
| target_wait (ptid_t ptid, struct target_waitstatus *status, int options) |
| { |
| return (*the_target->wait) (ptid, status, options); |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_mourn_inferior (ptid_t ptid) |
| { |
| (*the_target->mourn) (find_process_pid (ptid_get_pid (ptid))); |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_continue_no_signal (ptid_t ptid) |
| { |
| struct thread_resume resume_info; |
| |
| resume_info.thread = ptid; |
| resume_info.kind = resume_continue; |
| resume_info.sig = GDB_SIGNAL_0; |
| (*the_target->resume) (&resume_info, 1); |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_continue (ptid_t ptid, enum gdb_signal signal) |
| { |
| struct thread_resume resume_info; |
| |
| resume_info.thread = ptid; |
| resume_info.kind = resume_continue; |
| resume_info.sig = gdb_signal_to_host (signal); |
| (*the_target->resume) (&resume_info, 1); |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_supports_multi_process (void) |
| { |
| return (the_target->supports_multi_process != NULL ? |
| (*the_target->supports_multi_process) () : 0); |
| } |
| |
| int |
| start_non_stop (int nonstop) |
| { |
| if (the_target->start_non_stop == NULL) |
| { |
| if (nonstop) |
| return -1; |
| else |
| return 0; |
| } |
| |
| return (*the_target->start_non_stop) (nonstop); |
| } |
| |
| void |
| set_target_ops (struct target_ops *target) |
| { |
| the_target = XNEW (struct target_ops); |
| memcpy (the_target, target, sizeof (*the_target)); |
| } |
| |
| /* Convert pid to printable format. */ |
| |
| const char * |
| target_pid_to_str (ptid_t ptid) |
| { |
| static char buf[80]; |
| |
| if (ptid_equal (ptid, minus_one_ptid)) |
| xsnprintf (buf, sizeof (buf), "<all threads>"); |
| else if (ptid_equal (ptid, null_ptid)) |
| xsnprintf (buf, sizeof (buf), "<null thread>"); |
| else if (ptid_get_tid (ptid) != 0) |
| xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx", |
| ptid_get_pid (ptid), ptid_get_tid (ptid)); |
| else if (ptid_get_lwp (ptid) != 0) |
| xsnprintf (buf, sizeof (buf), "LWP %d.%ld", |
| ptid_get_pid (ptid), ptid_get_lwp (ptid)); |
| else |
| xsnprintf (buf, sizeof (buf), "Process %d", |
| ptid_get_pid (ptid)); |
| |
| return buf; |
| } |
| |
| int |
| kill_inferior (int pid) |
| { |
| gdb_agent_about_to_close (pid); |
| |
| return (*the_target->kill) (pid); |
| } |
| |
| /* Target can do hardware single step. */ |
| |
| int |
| target_can_do_hardware_single_step (void) |
| { |
| return 1; |
| } |
| |
| /* Default implementation for breakpoint_kind_for_pc. |
| |
| The default behavior for targets that don't implement breakpoint_kind_for_pc |
| is to use the size of a breakpoint as the kind. */ |
| |
| int |
| default_breakpoint_kind_from_pc (CORE_ADDR *pcptr) |
| { |
| int size = 0; |
| |
| gdb_assert (the_target->sw_breakpoint_from_kind != NULL); |
| |
| (*the_target->sw_breakpoint_from_kind) (0, &size); |
| return size; |
| } |