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, 2009
   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 #include "inf-child.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 target_ops *ops,
  37                                     struct regcache *regcache, int regnum)
  38 {
  39   if (regnum == -1)
  40     {
  41       for (regnum = 0;
  42            regnum < gdbarch_num_regs (get_regcache_arch (regcache));
  43            regnum++)
  44         regcache_raw_supply (regcache, regnum, NULL);
  45     }
  46   else
  47     regcache_raw_supply (regcache, regnum, NULL);
  48 }
  49
  50 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  51    this for all registers (including the floating point registers).  */
  52
  53 static void
  54 inf_child_store_inferior_registers (struct target_ops *ops,
  55                                     struct regcache *regcache, int regnum)
  56 {
  57 }
  58
  59 static void
  60 inf_child_post_attach (int pid)
  61 {
  62   /* This version of Unix doesn't require a meaningful "post attach"
  63      operation by a debugger.  */
  64 }
  65
  66 /* Get ready to modify the registers array.  On machines which store
  67    individual registers, this doesn't need to do anything.  On
  68    machines which store all the registers in one fell swoop, this
  69    makes sure that registers contains all the registers from the
  70    program being debugged.  */
  71
  72 static void
  73 inf_child_prepare_to_store (struct regcache *regcache)
  74 {
  75 }
  76
  77 static void
  78 inf_child_open (char *arg, int from_tty)
  79 {
  80   error (_("Use the \"run\" command to start a Unix child process."));
  81 }
  82
  83 static void
  84 inf_child_post_startup_inferior (ptid_t ptid)
  85 {
  86   /* This version of Unix doesn't require a meaningful "post startup
  87      inferior" operation by a debugger.  */
  88 }
  89
  90 static void
  91 inf_child_acknowledge_created_inferior (int pid)
  92 {
  93   /* This version of Unix doesn't require a meaningful "acknowledge
  94      created inferior" operation by a debugger.  */
  95 }
  96
  97 static void
  98 inf_child_insert_fork_catchpoint (int pid)
  99 {
 100   /* This version of Unix doesn't support notification of fork
 101      events.  */
 102 }
 103
 104 static int
 105 inf_child_remove_fork_catchpoint (int pid)
 106 {
 107   /* This version of Unix doesn't support notification of fork
 108      events.  */
 109   return 0;
 110 }
 111
 112 static void
 113 inf_child_insert_vfork_catchpoint (int pid)
 114 {
 115   /* This version of Unix doesn't support notification of vfork
 116      events.  */
 117 }
 118
 119 static int
 120 inf_child_remove_vfork_catchpoint (int pid)
 121 {
 122   /* This version of Unix doesn't support notification of vfork
 123      events.  */
 124   return 0;
 125 }
 126
 127 static int
 128 inf_child_follow_fork (struct target_ops *ops, int follow_child)
 129 {
 130   /* This version of Unix doesn't support following fork or vfork
 131      events.  */
 132   return 0;
 133 }
 134
 135 static void
 136 inf_child_insert_exec_catchpoint (int pid)
 137 {
 138   /* This version of Unix doesn't support notification of exec
 139      events.  */
 140 }
 141
 142 static int
 143 inf_child_remove_exec_catchpoint (int pid)
 144 {
 145   /* This version of Unix doesn't support notification of exec
 146      events.  */
 147   return 0;
 148 }
 149
 150 static int
 151 inf_child_set_syscall_catchpoint (int pid, int needed, int any_count,
 152                                   int table_size, int *table)
 153 {
 154   /* This version of Unix doesn't support notification of syscall
 155      events.  */
 156   return 0;
 157 }
 158
 159 static int
 160 inf_child_can_run (void)
 161 {
 162   return 1;
 163 }
 164
 165 static char *
 166 inf_child_pid_to_exec_file (int pid)
 167 {
 168   /* This version of Unix doesn't support translation of a process ID
 169      to the filename of the executable file.  */
 170   return NULL;
 171 }
 172
 173 struct target_ops *
 174 inf_child_target (void)
 175 {
 176   struct target_ops *t = XZALLOC (struct target_ops);
 177   t->to_shortname = "child";
 178   t->to_longname = "Unix child process";
 179   t->to_doc = "Unix child process (started by the \"run\" command).";
 180   t->to_open = inf_child_open;
 181   t->to_post_attach = inf_child_post_attach;
 182   t->to_fetch_registers = inf_child_fetch_inferior_registers;
 183   t->to_store_registers = inf_child_store_inferior_registers;
 184   t->to_prepare_to_store = inf_child_prepare_to_store;
 185   t->to_insert_breakpoint = memory_insert_breakpoint;
 186   t->to_remove_breakpoint = memory_remove_breakpoint;
 187   t->to_terminal_init = terminal_init_inferior;
 188   t->to_terminal_inferior = terminal_inferior;
 189   t->to_terminal_ours_for_output = terminal_ours_for_output;
 190   t->to_terminal_save_ours = terminal_save_ours;
 191   t->to_terminal_ours = terminal_ours;
 192   t->to_terminal_info = child_terminal_info;
 193   t->to_post_startup_inferior = inf_child_post_startup_inferior;
 194   t->to_acknowledge_created_inferior = inf_child_acknowledge_created_inferior;
 195   t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
 196   t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
 197   t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
 198   t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
 199   t->to_follow_fork = inf_child_follow_fork;
 200   t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
 201   t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
 202   t->to_set_syscall_catchpoint = inf_child_set_syscall_catchpoint;
 203   t->to_can_run = inf_child_can_run;
 204   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
 205   t->to_stratum = process_stratum;
 206   t->to_has_all_memory = default_child_has_all_memory;
 207   t->to_has_memory = default_child_has_memory;
 208   t->to_has_stack = default_child_has_stack;
 209   t->to_has_registers = default_child_has_registers;
 210   t->to_has_execution = default_child_has_execution;
 211   t->to_magic = OPS_MAGIC;
 212   return t;
 213 }