gdb/inf-child.c

   1 /* Default child (native) target interface, for GDB when running under
   2    Unix.
   3
   4    Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
   5    1999, 2000, 2001, 2002, 2004, 2005, 2007 Free Software Foundation, Inc.
   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 "defs.h"
  23 #include "regcache.h"
  24 #include "memattr.h"
  25 #include "symtab.h"
  26 #include "target.h"
  27 #include "inferior.h"
  28 #include "gdb_string.h"
  29
  30 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  31    for all registers.  */
  32
  33 static void
  34 inf_child_fetch_inferior_registers (struct regcache *regcache, int regnum)
  35 {
  36   if (regnum == -1)
  37     {
  38       for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
  39         regcache_raw_supply (regcache, regnum, NULL);
  40     }
  41   else
  42     regcache_raw_supply (regcache, regnum, NULL);
  43 }
  44
  45 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  46    this for all registers (including the floating point registers).  */
  47
  48 static void
  49 inf_child_store_inferior_registers (struct regcache *regcache, int regnum)
  50 {
  51 }
  52
  53 static void
  54 inf_child_post_attach (int pid)
  55 {
  56   /* This version of Unix doesn't require a meaningful "post attach"
  57      operation by a debugger.  */
  58 }
  59
  60 /* Get ready to modify the registers array.  On machines which store
  61    individual registers, this doesn't need to do anything.  On
  62    machines which store all the registers in one fell swoop, this
  63    makes sure that registers contains all the registers from the
  64    program being debugged.  */
  65
  66 static void
  67 inf_child_prepare_to_store (struct regcache *regcache)
  68 {
  69 }
  70
  71 static void
  72 inf_child_open (char *arg, int from_tty)
  73 {
  74   error (_("Use the \"run\" command to start a Unix child process."));
  75 }
  76
  77 static void
  78 inf_child_post_startup_inferior (ptid_t ptid)
  79 {
  80   /* This version of Unix doesn't require a meaningful "post startup
  81      inferior" operation by a debugger.  */
  82 }
  83
  84 static void
  85 inf_child_acknowledge_created_inferior (int pid)
  86 {
  87   /* This version of Unix doesn't require a meaningful "acknowledge
  88      created inferior" operation by a debugger.  */
  89 }
  90
  91 static void
  92 inf_child_insert_fork_catchpoint (int pid)
  93 {
  94   /* This version of Unix doesn't support notification of fork
  95      events.  */
  96 }
  97
  98 static int
  99 inf_child_remove_fork_catchpoint (int pid)
 100 {
 101   /* This version of Unix doesn't support notification of fork
 102      events.  */
 103   return 0;
 104 }
 105
 106 static void
 107 inf_child_insert_vfork_catchpoint (int pid)
 108 {
 109   /* This version of Unix doesn't support notification of vfork
 110      events.  */
 111 }
 112
 113 static int
 114 inf_child_remove_vfork_catchpoint (int pid)
 115 {
 116   /* This version of Unix doesn't support notification of vfork
 117      events.  */
 118   return 0;
 119 }
 120
 121 static int
 122 inf_child_follow_fork (struct target_ops *ops, int follow_child)
 123 {
 124   /* This version of Unix doesn't support following fork or vfork
 125      events.  */
 126   return 0;
 127 }
 128
 129 static void
 130 inf_child_insert_exec_catchpoint (int pid)
 131 {
 132   /* This version of Unix doesn't support notification of exec
 133      events.  */
 134 }
 135
 136 static int
 137 inf_child_remove_exec_catchpoint (int pid)
 138 {
 139   /* This version of Unix doesn't support notification of exec
 140      events.  */
 141   return 0;
 142 }
 143
 144 static int
 145 inf_child_reported_exec_events_per_exec_call (void)
 146 {
 147   /* This version of Unix doesn't support notification of exec
 148      events.  */
 149   return 1;
 150 }
 151
 152 static int
 153 inf_child_can_run (void)
 154 {
 155   return 1;
 156 }
 157
 158 static struct symtab_and_line *
 159 inf_child_enable_exception_callback (enum exception_event_kind kind,
 160                                      int enable)
 161 {
 162   return (struct symtab_and_line *) NULL;
 163 }
 164
 165 static struct exception_event_record *
 166 inf_child_get_current_exception_event (void)
 167 {
 168   return (struct exception_event_record *) NULL;
 169 }
 170
 171 static char *
 172 inf_child_pid_to_exec_file (int pid)
 173 {
 174   /* This version of Unix doesn't support translation of a process ID
 175      to the filename of the executable file.  */
 176   return NULL;
 177 }
 178
 179 struct target_ops *
 180 inf_child_target (void)
 181 {
 182   struct target_ops *t = XZALLOC (struct target_ops);
 183   t->to_shortname = "child";
 184   t->to_longname = "Unix child process";
 185   t->to_doc = "Unix child process (started by the \"run\" command).";
 186   t->to_open = inf_child_open;
 187   t->to_post_attach = inf_child_post_attach;
 188   t->to_fetch_registers = inf_child_fetch_inferior_registers;
 189   t->to_store_registers = inf_child_store_inferior_registers;
 190   t->to_prepare_to_store = inf_child_prepare_to_store;
 191   t->to_insert_breakpoint = memory_insert_breakpoint;
 192   t->to_remove_breakpoint = memory_remove_breakpoint;
 193   t->to_terminal_init = terminal_init_inferior;
 194   t->to_terminal_inferior = terminal_inferior;
 195   t->to_terminal_ours_for_output = terminal_ours_for_output;
 196   t->to_terminal_save_ours = terminal_save_ours;
 197   t->to_terminal_ours = terminal_ours;
 198   t->to_terminal_info = child_terminal_info;
 199   t->to_post_startup_inferior = inf_child_post_startup_inferior;
 200   t->to_acknowledge_created_inferior = inf_child_acknowledge_created_inferior;
 201   t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
 202   t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
 203   t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
 204   t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
 205   t->to_follow_fork = inf_child_follow_fork;
 206   t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
 207   t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
 208   t->to_reported_exec_events_per_exec_call =
 209     inf_child_reported_exec_events_per_exec_call;
 210   t->to_can_run = inf_child_can_run;
 211   t->to_enable_exception_callback = inf_child_enable_exception_callback;
 212   t->to_get_current_exception_event = inf_child_get_current_exception_event;
 213   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
 214   t->to_stratum = process_stratum;
 215   t->to_has_all_memory = 1;
 216   t->to_has_memory = 1;
 217   t->to_has_stack = 1;
 218   t->to_has_registers = 1;
 219   t->to_has_execution = 1;
 220   t->to_magic = OPS_MAGIC;
 221   return t;
 222 }