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 #include "target/target-utils.h"
  24 #include <fcntl.h>
  25
  26 struct target_ops *the_target;
  27
  28 void
  29 set_desired_thread (int use_general)
  30 {
  31   struct thread_info *found;
  32
  33   if (use_general == 1)
  34     found = find_thread_ptid (general_thread);
  35   else
  36     found = find_thread_ptid (cont_thread);
  37
  38   if (found == NULL)
  39     current_thread = get_first_thread ();
  40   else
  41     current_thread = found;
  42 }
  43
  44 int
  45 read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
  46 {
  47   int res;
  48   res = (*the_target->read_memory) (memaddr, myaddr, len);
  49   check_mem_read (memaddr, myaddr, len);
  50   return res;
  51 }
  52
  53 /* See target/target.h.  */
  54
  55 int
  56 target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
  57 {
  58   return read_inferior_memory (memaddr, myaddr, len);
  59 }
  60
  61 /* See target/target.h.  */
  62
  63 int
  64 target_read_uint32 (CORE_ADDR memaddr, uint32_t *result)
  65 {
  66   return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result));
  67 }
  68
  69 int
  70 write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
  71                        int len)
  72 {
  73   /* Lacking cleanups, there is some potential for a memory leak if the
  74      write fails and we go through error().  Make sure that no more than
  75      one buffer is ever pending by making BUFFER static.  */
  76   static unsigned char *buffer = 0;
  77   int res;
  78
  79   if (buffer != NULL)
  80     free (buffer);
  81
  82   buffer = xmalloc (len);
  83   memcpy (buffer, myaddr, len);
  84   check_mem_write (memaddr, buffer, myaddr, len);
  85   res = (*the_target->write_memory) (memaddr, buffer, len);
  86   free (buffer);
  87   buffer = NULL;
  88
  89   return res;
  90 }
  91
  92 /* See target/target.h.  */
  93
  94 int
  95 target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
  96 {
  97   return write_inferior_memory (memaddr, myaddr, len);
  98 }
  99
 100 ptid_t
 101 mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
 102         int connected_wait)
 103 {
 104   ptid_t ret;
 105
 106   if (connected_wait)
 107     server_waiting = 1;
 108
 109   ret = (*the_target->wait) (ptid, ourstatus, options);
 110
 111   /* We don't expose _LOADED events to gdbserver core.  See the
 112      `dlls_changed' global.  */
 113   if (ourstatus->kind == TARGET_WAITKIND_LOADED)
 114     ourstatus->kind = TARGET_WAITKIND_STOPPED;
 115
 116   /* If GDB is connected through TCP/serial, then GDBserver will most
 117      probably be running on its own terminal/console, so it's nice to
 118      print there why is GDBserver exiting.  If however, GDB is
 119      connected through stdio, then there's no need to spam the GDB
 120      console with this -- the user will already see the exit through
 121      regular GDB output, in that same terminal.  */
 122   if (!remote_connection_is_stdio ())
 123     {
 124       if (ourstatus->kind == TARGET_WAITKIND_EXITED)
 125         fprintf (stderr,
 126                  "\nChild exited with status %d\n", ourstatus->value.integer);
 127       else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
 128         fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
 129                  gdb_signal_to_host (ourstatus->value.sig),
 130                  gdb_signal_to_name (ourstatus->value.sig));
 131     }
 132
 133   if (connected_wait)
 134     server_waiting = 0;
 135
 136   return ret;
 137 }
 138
 139 /* See target/target.h.  */
 140
 141 void
 142 target_stop_and_wait (ptid_t ptid)
 143 {
 144   struct target_waitstatus status;
 145   int was_non_stop = non_stop;
 146   struct thread_resume resume_info;
 147
 148   resume_info.thread = ptid;
 149   resume_info.kind = resume_stop;
 150   resume_info.sig = GDB_SIGNAL_0;
 151   (*the_target->resume) (&resume_info, 1);
 152
 153   non_stop = 1;
 154   mywait (ptid, &status, 0, 0);
 155   non_stop = was_non_stop;
 156 }
 157
 158 /* See target/target.h.  */
 159
 160 void
 161 target_continue_no_signal (ptid_t ptid)
 162 {
 163   struct thread_resume resume_info;
 164
 165   resume_info.thread = ptid;
 166   resume_info.kind = resume_continue;
 167   resume_info.sig = GDB_SIGNAL_0;
 168   (*the_target->resume) (&resume_info, 1);
 169 }
 170
 171 int
 172 start_non_stop (int nonstop)
 173 {
 174   if (the_target->start_non_stop == NULL)
 175     {
 176       if (nonstop)
 177         return -1;
 178       else
 179         return 0;
 180     }
 181
 182   return (*the_target->start_non_stop) (nonstop);
 183 }
 184
 185 void
 186 set_target_ops (struct target_ops *target)
 187 {
 188   the_target = (struct target_ops *) xmalloc (sizeof (*the_target));
 189   memcpy (the_target, target, sizeof (*the_target));
 190 }
 191
 192 /* Convert pid to printable format.  */
 193
 194 const char *
 195 target_pid_to_str (ptid_t ptid)
 196 {
 197   static char buf[80];
 198
 199   if (ptid_equal (ptid, minus_one_ptid))
 200     xsnprintf (buf, sizeof (buf), "<all threads>");
 201   else if (ptid_equal (ptid, null_ptid))
 202     xsnprintf (buf, sizeof (buf), "<null thread>");
 203   else if (ptid_get_tid (ptid) != 0)
 204     xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx",
 205                ptid_get_pid (ptid), ptid_get_tid (ptid));
 206   else if (ptid_get_lwp (ptid) != 0)
 207     xsnprintf (buf, sizeof (buf), "LWP %d.%ld",
 208                ptid_get_pid (ptid), ptid_get_lwp (ptid));
 209   else
 210     xsnprintf (buf, sizeof (buf), "Process %d",
 211                ptid_get_pid (ptid));
 212
 213   return buf;
 214 }
 215
 216 int
 217 kill_inferior (int pid)
 218 {
 219   gdb_agent_about_to_close (pid);
 220
 221   return (*the_target->kill) (pid);
 222 }
 223
 224 static int
 225 target_fileio_read_stralloc_1_pread (int handle, gdb_byte *read_buf, int len,
 226                                      ULONGEST offset, int *target_errno)
 227 {
 228   int retval = pread (handle, read_buf, len, offset);
 229
 230   *target_errno = errno;
 231   return retval;
 232 }
 233
 234 static LONGEST
 235 target_fileio_read_stralloc_1 (struct inferior *inf, const char *filename,
 236                                gdb_byte **buf_p, int padding)
 237 {
 238   int fd;
 239   LONGEST retval;
 240
 241   fd = open (filename, O_RDONLY);
 242   if (fd == -1)
 243     return -1;
 244
 245   retval = read_alloc (buf_p, fd, target_fileio_read_stralloc_1_pread, padding);
 246
 247   close (fd);
 248
 249   return retval;
 250 }
 251
 252 char *
 253 target_fileio_read_stralloc (struct inferior *inf, const char *filename)
 254 {
 255   return read_stralloc (inf, filename, target_fileio_read_stralloc_1);
 256 }