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