gdb/gdbserver/target.c

   1 /* Target operations for the remote server for GDB.
   2    Copyright (C) 2002-2013 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 void
  27 set_desired_inferior (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   if (found == NULL)
  37     current_inferior = (struct thread_info *) all_threads.head;
  38   else
  39     current_inferior = found;
  40 }
  41
  42 int
  43 read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
  44 {
  45   int res;
  46   res = (*the_target->read_memory) (memaddr, myaddr, len);
  47   check_mem_read (memaddr, myaddr, len);
  48   return res;
  49 }
  50
  51 int
  52 write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
  53                        int len)
  54 {
  55   /* Lacking cleanups, there is some potential for a memory leak if the
  56      write fails and we go through error().  Make sure that no more than
  57      one buffer is ever pending by making BUFFER static.  */
  58   static unsigned char *buffer = 0;
  59   int res;
  60
  61   if (buffer != NULL)
  62     free (buffer);
  63
  64   buffer = xmalloc (len);
  65   memcpy (buffer, myaddr, len);
  66   check_mem_write (memaddr, buffer, myaddr, len);
  67   res = (*the_target->write_memory) (memaddr, buffer, len);
  68   free (buffer);
  69   buffer = NULL;
  70
  71   return res;
  72 }
  73
  74 ptid_t
  75 mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
  76         int connected_wait)
  77 {
  78   ptid_t ret;
  79
  80   if (connected_wait)
  81     server_waiting = 1;
  82
  83   ret = (*the_target->wait) (ptid, ourstatus, options);
  84
  85   /* We don't expose _LOADED events to gdbserver core.  See the
  86      `dlls_changed' global.  */
  87   if (ourstatus->kind == TARGET_WAITKIND_LOADED)
  88     ourstatus->kind = TARGET_WAITKIND_STOPPED;
  89
  90   /* If GDB is connected through TCP/serial, then GDBserver will most
  91      probably be running on its own terminal/console, so it's nice to
  92      print there why is GDBserver exiting.  If however, GDB is
  93      connected through stdio, then there's no need to spam the GDB
  94      console with this -- the user will already see the exit through
  95      regular GDB output, in that same terminal.  */
  96   if (!remote_connection_is_stdio ())
  97     {
  98       if (ourstatus->kind == TARGET_WAITKIND_EXITED)
  99         fprintf (stderr,
 100                  "\nChild exited with status %d\n", ourstatus->value.integer);
 101       else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
 102         fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
 103                  gdb_signal_to_host (ourstatus->value.sig),
 104                  gdb_signal_to_name (ourstatus->value.sig));
 105     }
 106
 107   if (connected_wait)
 108     server_waiting = 0;
 109
 110   return ret;
 111 }
 112
 113 int
 114 start_non_stop (int nonstop)
 115 {
 116   if (the_target->start_non_stop == NULL)
 117     {
 118       if (nonstop)
 119         return -1;
 120       else
 121         return 0;
 122     }
 123
 124   return (*the_target->start_non_stop) (nonstop);
 125 }
 126
 127 void
 128 set_target_ops (struct target_ops *target)
 129 {
 130   the_target = (struct target_ops *) xmalloc (sizeof (*the_target));
 131   memcpy (the_target, target, sizeof (*the_target));
 132 }
 133
 134 /* Convert pid to printable format.  */
 135
 136 const char *
 137 target_pid_to_str (ptid_t ptid)
 138 {
 139   static char buf[80];
 140
 141   if (ptid_equal (ptid, minus_one_ptid))
 142     xsnprintf (buf, sizeof (buf), "<all threads>");
 143   else if (ptid_equal (ptid, null_ptid))
 144     xsnprintf (buf, sizeof (buf), "<null thread>");
 145   else if (ptid_get_tid (ptid) != 0)
 146     xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx",
 147                ptid_get_pid (ptid), ptid_get_tid (ptid));
 148   else if (ptid_get_lwp (ptid) != 0)
 149     xsnprintf (buf, sizeof (buf), "LWP %d.%ld",
 150                ptid_get_pid (ptid), ptid_get_lwp (ptid));
 151   else
 152     xsnprintf (buf, sizeof (buf), "Process %d",
 153                ptid_get_pid (ptid));
 154
 155   return buf;
 156 }
 157
 158 int
 159 kill_inferior (int pid)
 160 {
 161   gdb_agent_about_to_close (pid);
 162
 163   return (*the_target->kill) (pid);
 164 }