gdb/gdbserver/target.c

   1 /* Target operations for the remote server for GDB.
   2    Copyright (C) 2002-2015 Free Software Foundation, Inc.
   3
   4    Contributed by MontaVista Software.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "server.h"
  22 #include "tracepoint.h"
  23
  24 struct target_ops *the_target;
  25
  26 int
  27 set_desired_thread (int use_general)
  28 {
  29   struct thread_info *found;
  30
  31   if (use_general == 1)
  32     found = find_thread_ptid (general_thread);
  33   else
  34     found = find_thread_ptid (cont_thread);
  35
  36   current_thread = found;
  37   return (current_thread != NULL);
  38 }
  39
  40 int
  41 read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
  42 {
  43   int res;
  44   res = (*the_target->read_memory) (memaddr, myaddr, len);
  45   check_mem_read (memaddr, myaddr, len);
  46   return res;
  47 }
  48
  49 /* See target/target.h.  */
  50
  51 int
  52 target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
  53 {
  54   return read_inferior_memory (memaddr, myaddr, len);
  55 }
  56
  57 /* See target/target.h.  */
  58
  59 int
  60 target_read_uint32 (CORE_ADDR memaddr, uint32_t *result)
  61 {
  62   return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result));
  63 }
  64
  65 int
  66 write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
  67                        int len)
  68 {
  69   /* Lacking cleanups, there is some potential for a memory leak if the
  70      write fails and we go through error().  Make sure that no more than
  71      one buffer is ever pending by making BUFFER static.  */
  72   static unsigned char *buffer = 0;
  73   int res;
  74
  75   if (buffer != NULL)
  76     free (buffer);
  77
  78   buffer = xmalloc (len);
  79   memcpy (buffer, myaddr, len);
  80   check_mem_write (memaddr, buffer, myaddr, len);
  81   res = (*the_target->write_memory) (memaddr, buffer, len);
  82   free (buffer);
  83   buffer = NULL;
  84
  85   return res;
  86 }
  87
  88 /* See target/target.h.  */
  89
  90 int
  91 target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
  92 {
  93   return write_inferior_memory (memaddr, myaddr, len);
  94 }
  95
  96 ptid_t
  97 mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
  98         int connected_wait)
  99 {
 100   ptid_t ret;
 101
 102   if (connected_wait)
 103     server_waiting = 1;
 104
 105   ret = (*the_target->wait) (ptid, ourstatus, options);
 106
 107   /* We don't expose _LOADED events to gdbserver core.  See the
 108      `dlls_changed' global.  */
 109   if (ourstatus->kind == TARGET_WAITKIND_LOADED)
 110     ourstatus->kind = TARGET_WAITKIND_STOPPED;
 111
 112   /* If GDB is connected through TCP/serial, then GDBserver will most
 113      probably be running on its own terminal/console, so it's nice to
 114      print there why is GDBserver exiting.  If however, GDB is
 115      connected through stdio, then there's no need to spam the GDB
 116      console with this -- the user will already see the exit through
 117      regular GDB output, in that same terminal.  */
 118   if (!remote_connection_is_stdio ())
 119     {
 120       if (ourstatus->kind == TARGET_WAITKIND_EXITED)
 121         fprintf (stderr,
 122                  "\nChild exited with status %d\n", ourstatus->value.integer);
 123       else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
 124         fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
 125                  gdb_signal_to_host (ourstatus->value.sig),
 126                  gdb_signal_to_name (ourstatus->value.sig));
 127     }
 128
 129   if (connected_wait)
 130     server_waiting = 0;
 131
 132   return ret;
 133 }
 134
 135 /* See target/target.h.  */
 136
 137 void
 138 target_stop_and_wait (ptid_t ptid)
 139 {
 140   struct target_waitstatus status;
 141   int was_non_stop = non_stop;
 142   struct thread_resume resume_info;
 143
 144   resume_info.thread = ptid;
 145   resume_info.kind = resume_stop;
 146   resume_info.sig = GDB_SIGNAL_0;
 147   (*the_target->resume) (&resume_info, 1);
 148
 149   non_stop = 1;
 150   mywait (ptid, &status, 0, 0);
 151   non_stop = was_non_stop;
 152 }
 153
 154 /* See target/target.h.  */
 155
 156 void
 157 target_continue_no_signal (ptid_t ptid)
 158 {
 159   struct thread_resume resume_info;
 160
 161   resume_info.thread = ptid;
 162   resume_info.kind = resume_continue;
 163   resume_info.sig = GDB_SIGNAL_0;
 164   (*the_target->resume) (&resume_info, 1);
 165 }
 166
 167 int
 168 start_non_stop (int nonstop)
 169 {
 170   if (the_target->start_non_stop == NULL)
 171     {
 172       if (nonstop)
 173         return -1;
 174       else
 175         return 0;
 176     }
 177
 178   return (*the_target->start_non_stop) (nonstop);
 179 }
 180
 181 void
 182 set_target_ops (struct target_ops *target)
 183 {
 184   the_target = XNEW (struct target_ops);
 185   memcpy (the_target, target, sizeof (*the_target));
 186 }
 187
 188 /* Convert pid to printable format.  */
 189
 190 const char *
 191 target_pid_to_str (ptid_t ptid)
 192 {
 193   static char buf[80];
 194
 195   if (ptid_equal (ptid, minus_one_ptid))
 196     xsnprintf (buf, sizeof (buf), "<all threads>");
 197   else if (ptid_equal (ptid, null_ptid))
 198     xsnprintf (buf, sizeof (buf), "<null thread>");
 199   else if (ptid_get_tid (ptid) != 0)
 200     xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx",
 201                ptid_get_pid (ptid), ptid_get_tid (ptid));
 202   else if (ptid_get_lwp (ptid) != 0)
 203     xsnprintf (buf, sizeof (buf), "LWP %d.%ld",
 204                ptid_get_pid (ptid), ptid_get_lwp (ptid));
 205   else
 206     xsnprintf (buf, sizeof (buf), "Process %d",
 207                ptid_get_pid (ptid));
 208
 209   return buf;
 210 }
 211
 212 int
 213 kill_inferior (int pid)
 214 {
 215   gdb_agent_about_to_close (pid);
 216
 217   return (*the_target->kill) (pid);
 218 }
 219
 220 /* Target can do hardware single step.  */
 221
 222 int
 223 target_can_do_hardware_single_step (void)
 224 {
 225   return 1;
 226 }