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 2 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, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 #include "defs.h"
  25 #include "regcache.h"
  26 #include "memattr.h"
  27 #include "symtab.h"
  28 #include "target.h"
  29 #include "inferior.h"
  30 #include "gdb_string.h"
  31
  32 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  33    for all registers.  */
  34
  35 static void
  36 inf_child_fetch_inferior_registers (struct regcache *regcache, int regnum)
  37 {
  38   if (regnum == -1)
  39     {
  40       for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
  41         regcache_raw_supply (regcache, regnum, NULL);
  42     }
  43   else
  44     regcache_raw_supply (regcache, regnum, NULL);
  45 }
  46
  47 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  48    this for all registers (including the floating point registers).  */
  49
  50 static void
  51 inf_child_store_inferior_registers (struct regcache *regcache, int regnum)
  52 {
  53 }
  54
  55 static void
  56 inf_child_post_attach (int pid)
  57 {
  58   /* This version of Unix doesn't require a meaningful "post attach"
  59      operation by a debugger.  */
  60 }
  61
  62 /* Get ready to modify the registers array.  On machines which store
  63    individual registers, this doesn't need to do anything.  On
  64    machines which store all the registers in one fell swoop, this
  65    makes sure that registers contains all the registers from the
  66    program being debugged.  */
  67
  68 static void
  69 inf_child_prepare_to_store (struct regcache *regcache)
  70 {
  71 }
  72
  73 static void
  74 inf_child_open (char *arg, int from_tty)
  75 {
  76   error (_("Use the \"run\" command to start a Unix child process."));
  77 }
  78
  79 static void
  80 inf_child_post_startup_inferior (ptid_t ptid)
  81 {
  82   /* This version of Unix doesn't require a meaningful "post startup
  83      inferior" operation by a debugger.  */
  84 }
  85
  86 static void
  87 inf_child_acknowledge_created_inferior (int pid)
  88 {
  89   /* This version of Unix doesn't require a meaningful "acknowledge
  90      created inferior" operation by a debugger.  */
  91 }
  92
  93 static void
  94 inf_child_insert_fork_catchpoint (int pid)
  95 {
  96   /* This version of Unix doesn't support notification of fork
  97      events.  */
  98 }
  99
 100 static int
 101 inf_child_remove_fork_catchpoint (int pid)
 102 {
 103   /* This version of Unix doesn't support notification of fork
 104      events.  */
 105   return 0;
 106 }
 107
 108 static void
 109 inf_child_insert_vfork_catchpoint (int pid)
 110 {
 111   /* This version of Unix doesn't support notification of vfork
 112      events.  */
 113 }
 114
 115 static int
 116 inf_child_remove_vfork_catchpoint (int pid)
 117 {
 118   /* This version of Unix doesn't support notification of vfork
 119      events.  */
 120   return 0;
 121 }
 122
 123 static int
 124 inf_child_follow_fork (struct target_ops *ops, int follow_child)
 125 {
 126   /* This version of Unix doesn't support following fork or vfork
 127      events.  */
 128   return 0;
 129 }
 130
 131 static void
 132 inf_child_insert_exec_catchpoint (int pid)
 133 {
 134   /* This version of Unix doesn't support notification of exec
 135      events.  */
 136 }
 137
 138 static int
 139 inf_child_remove_exec_catchpoint (int pid)
 140 {
 141   /* This version of Unix doesn't support notification of exec
 142      events.  */
 143   return 0;
 144 }
 145
 146 static int
 147 inf_child_reported_exec_events_per_exec_call (void)
 148 {
 149   /* This version of Unix doesn't support notification of exec
 150      events.  */
 151   return 1;
 152 }
 153
 154 static int
 155 inf_child_can_run (void)
 156 {
 157   return 1;
 158 }
 159
 160 static struct symtab_and_line *
 161 inf_child_enable_exception_callback (enum exception_event_kind kind,
 162                                      int enable)
 163 {
 164   return (struct symtab_and_line *) NULL;
 165 }
 166
 167 static struct exception_event_record *
 168 inf_child_get_current_exception_event (void)
 169 {
 170   return (struct exception_event_record *) NULL;
 171 }
 172
 173 static char *
 174 inf_child_pid_to_exec_file (int pid)
 175 {
 176   /* This version of Unix doesn't support translation of a process ID
 177      to the filename of the executable file.  */
 178   return NULL;
 179 }
 180
 181 struct target_ops *
 182 inf_child_target (void)
 183 {
 184   struct target_ops *t = XZALLOC (struct target_ops);
 185   t->to_shortname = "child";
 186   t->to_longname = "Unix child process";
 187   t->to_doc = "Unix child process (started by the \"run\" command).";
 188   t->to_open = inf_child_open;
 189   t->to_post_attach = inf_child_post_attach;
 190   t->to_fetch_registers = inf_child_fetch_inferior_registers;
 191   t->to_store_registers = inf_child_store_inferior_registers;
 192   t->to_prepare_to_store = inf_child_prepare_to_store;
 193   t->to_insert_breakpoint = memory_insert_breakpoint;
 194   t->to_remove_breakpoint = memory_remove_breakpoint;
 195   t->to_terminal_init = terminal_init_inferior;
 196   t->to_terminal_inferior = terminal_inferior;
 197   t->to_terminal_ours_for_output = terminal_ours_for_output;
 198   t->to_terminal_save_ours = terminal_save_ours;
 199   t->to_terminal_ours = terminal_ours;
 200   t->to_terminal_info = child_terminal_info;
 201   t->to_post_startup_inferior = inf_child_post_startup_inferior;
 202   t->to_acknowledge_created_inferior = inf_child_acknowledge_created_inferior;
 203   t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
 204   t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
 205   t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
 206   t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
 207   t->to_follow_fork = inf_child_follow_fork;
 208   t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
 209   t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
 210   t->to_reported_exec_events_per_exec_call =
 211     inf_child_reported_exec_events_per_exec_call;
 212   t->to_can_run = inf_child_can_run;
 213   t->to_enable_exception_callback = inf_child_enable_exception_callback;
 214   t->to_get_current_exception_event = inf_child_get_current_exception_event;
 215   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
 216   t->to_stratum = process_stratum;
 217   t->to_has_all_memory = 1;
 218   t->to_has_memory = 1;
 219   t->to_has_stack = 1;
 220   t->to_has_registers = 1;
 221   t->to_has_execution = 1;
 222   t->to_magic = OPS_MAGIC;
 223   return t;
 224 }