gdb/gdbserver/target.c

   1 /* Target operations for the remote server for GDB.
   2    Copyright (C) 2002, 2004, 2005, 2007, 2008, 2009
   3    Free Software Foundation, Inc.
   4
   5    Contributed by MontaVista Software.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "server.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_pid (general_thread);
  33   else
  34     {
  35       found = NULL;
  36
  37       /* If we are continuing any (all) thread(s), use step_thread
  38          to decide which thread to step and/or send the specified
  39          signal to.  */
  40       if ((!ptid_equal (step_thread, null_ptid)
  41            && !ptid_equal (step_thread, minus_one_ptid))
  42           && (ptid_equal (cont_thread, null_ptid)
  43               || ptid_equal (cont_thread, minus_one_ptid)))
  44         found = find_thread_pid (step_thread);
  45
  46       if (found == NULL)
  47         found = find_thread_pid (cont_thread);
  48     }
  49
  50   if (found == NULL)
  51     current_inferior = (struct thread_info *) all_threads.head;
  52   else
  53     current_inferior = found;
  54 }
  55
  56 int
  57 read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
  58 {
  59   int res;
  60   res = (*the_target->read_memory) (memaddr, myaddr, len);
  61   check_mem_read (memaddr, myaddr, len);
  62   return res;
  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, len);
  81   res = (*the_target->write_memory) (memaddr, buffer, len);
  82   free (buffer);
  83   buffer = NULL;
  84
  85   return res;
  86 }
  87
  88 ptid_t
  89 mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
  90         int connected_wait)
  91 {
  92   ptid_t ret;
  93
  94   if (connected_wait)
  95     server_waiting = 1;
  96
  97   ret = (*the_target->wait) (ptid, ourstatus, options);
  98
  99   if (ourstatus->kind == TARGET_WAITKIND_EXITED)
 100     fprintf (stderr,
 101              "\nChild exited with status %d\n", ourstatus->value.sig);
 102   else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
 103     fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
 104              target_signal_to_host (ourstatus->value.sig),
 105              target_signal_to_name (ourstatus->value.sig));
 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     snprintf (buf, sizeof (buf), "<all threads>");
 143   else if (ptid_equal (ptid, null_ptid))
 144     snprintf (buf, sizeof (buf), "<null thread>");
 145   else if (ptid_get_tid (ptid) != 0)
 146     snprintf (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     snprintf (buf, sizeof (buf), "LWP %d.%ld",
 150               ptid_get_pid (ptid), ptid_get_lwp (ptid));
 151   else
 152     snprintf (buf, sizeof (buf), "Process %d",
 153               ptid_get_pid (ptid));
 154
 155   return buf;
 156 }