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, 2010, 2011
   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_insert_fork_catchpoint (int pid)
  92 {
  93   /* This version of Unix doesn't support notification of fork
  94      events.  */
  95 }
  96
  97 static int
  98 inf_child_remove_fork_catchpoint (int pid)
  99 {
 100   /* This version of Unix doesn't support notification of fork
 101      events.  */
 102   return 0;
 103 }
 104
 105 static void
 106 inf_child_insert_vfork_catchpoint (int pid)
 107 {
 108   /* This version of Unix doesn't support notification of vfork
 109      events.  */
 110 }
 111
 112 static int
 113 inf_child_remove_vfork_catchpoint (int pid)
 114 {
 115   /* This version of Unix doesn't support notification of vfork
 116      events.  */
 117   return 0;
 118 }
 119
 120 static int
 121 inf_child_follow_fork (struct target_ops *ops, int follow_child)
 122 {
 123   /* This version of Unix doesn't support following fork or vfork
 124      events.  */
 125   return 0;
 126 }
 127
 128 static void
 129 inf_child_insert_exec_catchpoint (int pid)
 130 {
 131   /* This version of Unix doesn't support notification of exec
 132      events.  */
 133 }
 134
 135 static int
 136 inf_child_remove_exec_catchpoint (int pid)
 137 {
 138   /* This version of Unix doesn't support notification of exec
 139      events.  */
 140   return 0;
 141 }
 142
 143 static int
 144 inf_child_set_syscall_catchpoint (int pid, int needed, int any_count,
 145                                   int table_size, int *table)
 146 {
 147   /* This version of Unix doesn't support notification of syscall
 148      events.  */
 149   return 0;
 150 }
 151
 152 static int
 153 inf_child_can_run (void)
 154 {
 155   return 1;
 156 }
 157
 158 static char *
 159 inf_child_pid_to_exec_file (int pid)
 160 {
 161   /* This version of Unix doesn't support translation of a process ID
 162      to the filename of the executable file.  */
 163   return NULL;
 164 }
 165
 166 struct target_ops *
 167 inf_child_target (void)
 168 {
 169   struct target_ops *t = XZALLOC (struct target_ops);
 170
 171   t->to_shortname = "child";
 172   t->to_longname = "Unix child process";
 173   t->to_doc = "Unix child process (started by the \"run\" command).";
 174   t->to_open = inf_child_open;
 175   t->to_post_attach = inf_child_post_attach;
 176   t->to_fetch_registers = inf_child_fetch_inferior_registers;
 177   t->to_store_registers = inf_child_store_inferior_registers;
 178   t->to_prepare_to_store = inf_child_prepare_to_store;
 179   t->to_insert_breakpoint = memory_insert_breakpoint;
 180   t->to_remove_breakpoint = memory_remove_breakpoint;
 181   t->to_terminal_init = terminal_init_inferior;
 182   t->to_terminal_inferior = terminal_inferior;
 183   t->to_terminal_ours_for_output = terminal_ours_for_output;
 184   t->to_terminal_save_ours = terminal_save_ours;
 185   t->to_terminal_ours = terminal_ours;
 186   t->to_terminal_info = child_terminal_info;
 187   t->to_post_startup_inferior = inf_child_post_startup_inferior;
 188   t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
 189   t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
 190   t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
 191   t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
 192   t->to_follow_fork = inf_child_follow_fork;
 193   t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
 194   t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
 195   t->to_set_syscall_catchpoint = inf_child_set_syscall_catchpoint;
 196   t->to_can_run = inf_child_can_run;
 197   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
 198   t->to_stratum = process_stratum;
 199   t->to_has_all_memory = default_child_has_all_memory;
 200   t->to_has_memory = default_child_has_memory;
 201   t->to_has_stack = default_child_has_stack;
 202   t->to_has_registers = default_child_has_registers;
 203   t->to_has_execution = default_child_has_execution;
 204   t->to_magic = OPS_MAGIC;
 205   return t;
 206 }