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 void
  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   if (found == NULL)
  37     current_thread = get_first_thread ();
  38   else
  39     current_thread = 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 /* See target/target.h.  */
  52
  53 int
  54 target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
  55 {
  56   return read_inferior_memory (memaddr, myaddr, len);
  57 }
  58
  59 /* See target/target.h.  */
  60
  61 int
  62 target_read_uint32 (CORE_ADDR memaddr, uint32_t *result)
  63 {
  64   return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result));
  65 }
  66
  67 int
  68 write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
  69                        int len)
  70 {
  71   /* Lacking cleanups, there is some potential for a memory leak if the
  72      write fails and we go through error().  Make sure that no more than
  73      one buffer is ever pending by making BUFFER static.  */
  74   static unsigned char *buffer = 0;
  75   int res;
  76
  77   if (buffer != NULL)
  78     free (buffer);
  79
  80   buffer = xmalloc (len);
  81   memcpy (buffer, myaddr, len);
  82   check_mem_write (memaddr, buffer, myaddr, len);
  83   res = (*the_target->write_memory) (memaddr, buffer, len);
  84   free (buffer);
  85   buffer = NULL;
  86
  87   return res;
  88 }
  89
  90 /* See target/target.h.  */
  91
  92 int
  93 target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
  94 {
  95   return write_inferior_memory (memaddr, myaddr, len);
  96 }
  97
  98 ptid_t
  99 mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
 100         int connected_wait)
 101 {
 102   ptid_t ret;
 103
 104   if (connected_wait)
 105     server_waiting = 1;
 106
 107   ret = (*the_target->wait) (ptid, ourstatus, options);
 108
 109   /* We don't expose _LOADED events to gdbserver core.  See the
 110      `dlls_changed' global.  */
 111   if (ourstatus->kind == TARGET_WAITKIND_LOADED)
 112     ourstatus->kind = TARGET_WAITKIND_STOPPED;
 113
 114   /* If GDB is connected through TCP/serial, then GDBserver will most
 115      probably be running on its own terminal/console, so it's nice to
 116      print there why is GDBserver exiting.  If however, GDB is
 117      connected through stdio, then there's no need to spam the GDB
 118      console with this -- the user will already see the exit through
 119      regular GDB output, in that same terminal.  */
 120   if (!remote_connection_is_stdio ())
 121     {
 122       if (ourstatus->kind == TARGET_WAITKIND_EXITED)
 123         fprintf (stderr,
 124                  "\nChild exited with status %d\n", ourstatus->value.integer);
 125       else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
 126         fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
 127                  gdb_signal_to_host (ourstatus->value.sig),
 128                  gdb_signal_to_name (ourstatus->value.sig));
 129     }
 130
 131   if (connected_wait)
 132     server_waiting = 0;
 133
 134   return ret;
 135 }
 136
 137 /* See target/target.h.  */
 138
 139 void
 140 target_stop_and_wait (ptid_t ptid)
 141 {
 142   struct target_waitstatus status;
 143   int was_non_stop = non_stop;
 144   struct thread_resume resume_info;
 145
 146   resume_info.thread = ptid;
 147   resume_info.kind = resume_stop;
 148   resume_info.sig = GDB_SIGNAL_0;
 149   (*the_target->resume) (&resume_info, 1);
 150
 151   non_stop = 1;
 152   mywait (ptid, &status, 0, 0);
 153   non_stop = was_non_stop;
 154 }
 155
 156 /* See target/target.h.  */
 157
 158 void
 159 target_continue_no_signal (ptid_t ptid)
 160 {
 161   struct thread_resume resume_info;
 162
 163   resume_info.thread = ptid;
 164   resume_info.kind = resume_continue;
 165   resume_info.sig = GDB_SIGNAL_0;
 166   (*the_target->resume) (&resume_info, 1);
 167 }
 168
 169 int
 170 start_non_stop (int nonstop)
 171 {
 172   if (the_target->start_non_stop == NULL)
 173     {
 174       if (nonstop)
 175         return -1;
 176       else
 177         return 0;
 178     }
 179
 180   return (*the_target->start_non_stop) (nonstop);
 181 }
 182
 183 void
 184 set_target_ops (struct target_ops *target)
 185 {
 186   the_target = (struct target_ops *) xmalloc (sizeof (*the_target));
 187   memcpy (the_target, target, sizeof (*the_target));
 188 }
 189
 190 /* Convert pid to printable format.  */
 191
 192 const char *
 193 target_pid_to_str (ptid_t ptid)
 194 {
 195   static char buf[80];
 196
 197   if (ptid_equal (ptid, minus_one_ptid))
 198     xsnprintf (buf, sizeof (buf), "<all threads>");
 199   else if (ptid_equal (ptid, null_ptid))
 200     xsnprintf (buf, sizeof (buf), "<null thread>");
 201   else if (ptid_get_tid (ptid) != 0)
 202     xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx",
 203                ptid_get_pid (ptid), ptid_get_tid (ptid));
 204   else if (ptid_get_lwp (ptid) != 0)
 205     xsnprintf (buf, sizeof (buf), "LWP %d.%ld",
 206                ptid_get_pid (ptid), ptid_get_lwp (ptid));
 207   else
 208     xsnprintf (buf, sizeof (buf), "Process %d",
 209                ptid_get_pid (ptid));
 210
 211   return buf;
 212 }
 213
 214 int
 215 kill_inferior (int pid)
 216 {
 217   gdb_agent_about_to_close (pid);
 218
 219   return (*the_target->kill) (pid);
 220 }