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, 2008
   6    Free Software Foundation, Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "regcache.h"
  25 #include "memattr.h"
  26 #include "symtab.h"
  27 #include "target.h"
  28 #include "inferior.h"
  29 #include "gdb_string.h"
  30
  31 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  32    for all registers.  */
  33
  34 static void
  35 inf_child_fetch_inferior_registers (struct regcache *regcache, int regnum)
  36 {
  37   if (regnum == -1)
  38     {
  39       for (regnum = 0;
  40            regnum < gdbarch_num_regs (get_regcache_arch (regcache));
  41            regnum++)
  42         regcache_raw_supply (regcache, regnum, NULL);
  43     }
  44   else
  45     regcache_raw_supply (regcache, regnum, NULL);
  46 }
  47
  48 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  49    this for all registers (including the floating point registers).  */
  50
  51 static void
  52 inf_child_store_inferior_registers (struct regcache *regcache, int regnum)
  53 {
  54 }
  55
  56 static void
  57 inf_child_post_attach (int pid)
  58 {
  59   /* This version of Unix doesn't require a meaningful "post attach"
  60      operation by a debugger.  */
  61 }
  62
  63 /* Get ready to modify the registers array.  On machines which store
  64    individual registers, this doesn't need to do anything.  On
  65    machines which store all the registers in one fell swoop, this
  66    makes sure that registers contains all the registers from the
  67    program being debugged.  */
  68
  69 static void
  70 inf_child_prepare_to_store (struct regcache *regcache)
  71 {
  72 }
  73
  74 static void
  75 inf_child_open (char *arg, int from_tty)
  76 {
  77   error (_("Use the \"run\" command to start a Unix child process."));
  78 }
  79
  80 static void
  81 inf_child_post_startup_inferior (ptid_t ptid)
  82 {
  83   /* This version of Unix doesn't require a meaningful "post startup
  84      inferior" operation by a debugger.  */
  85 }
  86
  87 static void
  88 inf_child_acknowledge_created_inferior (int pid)
  89 {
  90   /* This version of Unix doesn't require a meaningful "acknowledge
  91      created inferior" operation by a debugger.  */
  92 }
  93
  94 static void
  95 inf_child_insert_fork_catchpoint (int pid)
  96 {
  97   /* This version of Unix doesn't support notification of fork
  98      events.  */
  99 }
 100
 101 static int
 102 inf_child_remove_fork_catchpoint (int pid)
 103 {
 104   /* This version of Unix doesn't support notification of fork
 105      events.  */
 106   return 0;
 107 }
 108
 109 static void
 110 inf_child_insert_vfork_catchpoint (int pid)
 111 {
 112   /* This version of Unix doesn't support notification of vfork
 113      events.  */
 114 }
 115
 116 static int
 117 inf_child_remove_vfork_catchpoint (int pid)
 118 {
 119   /* This version of Unix doesn't support notification of vfork
 120      events.  */
 121   return 0;
 122 }
 123
 124 static int
 125 inf_child_follow_fork (struct target_ops *ops, int follow_child)
 126 {
 127   /* This version of Unix doesn't support following fork or vfork
 128      events.  */
 129   return 0;
 130 }
 131
 132 static void
 133 inf_child_insert_exec_catchpoint (int pid)
 134 {
 135   /* This version of Unix doesn't support notification of exec
 136      events.  */
 137 }
 138
 139 static int
 140 inf_child_remove_exec_catchpoint (int pid)
 141 {
 142   /* This version of Unix doesn't support notification of exec
 143      events.  */
 144   return 0;
 145 }
 146
 147 static int
 148 inf_child_reported_exec_events_per_exec_call (void)
 149 {
 150   /* This version of Unix doesn't support notification of exec
 151      events.  */
 152   return 1;
 153 }
 154
 155 static int
 156 inf_child_can_run (void)
 157 {
 158   return 1;
 159 }
 160
 161 static char *
 162 inf_child_pid_to_exec_file (int pid)
 163 {
 164   /* This version of Unix doesn't support translation of a process ID
 165      to the filename of the executable file.  */
 166   return NULL;
 167 }
 168
 169 struct target_ops *
 170 inf_child_target (void)
 171 {
 172   struct target_ops *t = XZALLOC (struct target_ops);
 173   t->to_shortname = "child";
 174   t->to_longname = "Unix child process";
 175   t->to_doc = "Unix child process (started by the \"run\" command).";
 176   t->to_open = inf_child_open;
 177   t->to_post_attach = inf_child_post_attach;
 178   t->to_fetch_registers = inf_child_fetch_inferior_registers;
 179   t->to_store_registers = inf_child_store_inferior_registers;
 180   t->to_prepare_to_store = inf_child_prepare_to_store;
 181   t->to_insert_breakpoint = memory_insert_breakpoint;
 182   t->to_remove_breakpoint = memory_remove_breakpoint;
 183   t->to_terminal_init = terminal_init_inferior;
 184   t->to_terminal_inferior = terminal_inferior;
 185   t->to_terminal_ours_for_output = terminal_ours_for_output;
 186   t->to_terminal_save_ours = terminal_save_ours;
 187   t->to_terminal_ours = terminal_ours;
 188   t->to_terminal_info = child_terminal_info;
 189   t->to_post_startup_inferior = inf_child_post_startup_inferior;
 190   t->to_acknowledge_created_inferior = inf_child_acknowledge_created_inferior;
 191   t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
 192   t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
 193   t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
 194   t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
 195   t->to_follow_fork = inf_child_follow_fork;
 196   t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
 197   t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
 198   t->to_reported_exec_events_per_exec_call =
 199     inf_child_reported_exec_events_per_exec_call;
 200   t->to_can_run = inf_child_can_run;
 201   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
 202   t->to_stratum = process_stratum;
 203   t->to_has_all_memory = 1;
 204   t->to_has_memory = 1;
 205   t->to_has_stack = 1;
 206   t->to_has_registers = 1;
 207   t->to_has_execution = 1;
 208   t->to_magic = OPS_MAGIC;
 209   return t;
 210 }