gdb/inf-child.c

   1 /* Default child (native) target interface, for GDB when running under
   2    Unix.
   3
   4    Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   5    1998, 1999, 2000, 2001, 2002, 2004 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., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, 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 (int regnum)
  37 {
  38   if (regnum == -1)
  39     {
  40       for (regnum = 0; regnum < NUM_REGS; regnum++)
  41         regcache_raw_supply (current_regcache, regnum, NULL);
  42     }
  43   else
  44     regcache_raw_supply (current_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 (int regnum)
  52 {
  53 }
  54
  55 void
  56 inf_child_post_wait (ptid_t ptid, int wait_status)
  57 {
  58   /* This version of Unix doesn't require a meaningful "post wait"
  59      operation.
  60    */
  61 }
  62
  63 static void
  64 inf_child_post_attach (int pid)
  65 {
  66   /* This version of Unix doesn't require a meaningful "post attach"
  67      operation by a debugger.  */
  68 }
  69
  70 /* Get ready to modify the registers array.  On machines which store
  71    individual registers, this doesn't need to do anything.  On
  72    machines which store all the registers in one fell swoop, this
  73    makes sure that registers contains all the registers from the
  74    program being debugged.  */
  75
  76 static void
  77 inf_child_prepare_to_store (void)
  78 {
  79 }
  80
  81 static void
  82 inf_child_open (char *arg, int from_tty)
  83 {
  84   error ("Use the \"run\" command to start a Unix child process.");
  85 }
  86
  87 static void
  88 inf_child_post_startup_inferior (ptid_t ptid)
  89 {
  90   /* This version of Unix doesn't require a meaningful "post startup
  91      inferior" operation by a debugger.  */
  92 }
  93
  94 static void
  95 inf_child_acknowledge_created_inferior (int pid)
  96 {
  97   /* This version of Unix doesn't require a meaningful "acknowledge
  98      created inferior" operation by a debugger.  */
  99 }
 100
 101 static int
 102 inf_child_insert_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 int
 110 inf_child_remove_fork_catchpoint (int pid)
 111 {
 112   /* This version of Unix doesn't support notification of fork
 113      events.  */
 114   return 0;
 115 }
 116
 117 static int
 118 inf_child_insert_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_remove_vfork_catchpoint (int pid)
 127 {
 128   /* This version of Unix doesn't support notification of vfork
 129      events.  */
 130   return 0;
 131 }
 132
 133 static int
 134 inf_child_follow_fork (int follow_child)
 135 {
 136   /* This version of Unix doesn't support following fork or vfork
 137      events.  */
 138   return 0;
 139 }
 140
 141 static int
 142 inf_child_insert_exec_catchpoint (int pid)
 143 {
 144   /* This version of Unix doesn't support notification of exec
 145      events.  */
 146   return 0;
 147 }
 148
 149 static int
 150 inf_child_remove_exec_catchpoint (int pid)
 151 {
 152   /* This version of Unix doesn't support notification of exec
 153      events.  */
 154   return 0;
 155 }
 156
 157 static int
 158 inf_child_reported_exec_events_per_exec_call (void)
 159 {
 160   /* This version of Unix doesn't support notification of exec
 161      events.  */
 162   return 1;
 163 }
 164
 165 static int
 166 inf_child_can_run (void)
 167 {
 168   return 1;
 169 }
 170
 171 static struct symtab_and_line *
 172 inf_child_enable_exception_callback (enum exception_event_kind kind,
 173                                      int enable)
 174 {
 175   return (struct symtab_and_line *) NULL;
 176 }
 177
 178 static struct exception_event_record *
 179 inf_child_get_current_exception_event (void)
 180 {
 181   return (struct exception_event_record *) NULL;
 182 }
 183
 184 static char *
 185 inf_child_pid_to_exec_file (int pid)
 186 {
 187   /* This version of Unix doesn't support translation of a process ID
 188      to the filename of the executable file.  */
 189   return NULL;
 190 }
 191
 192 struct target_ops *
 193 inf_child_target (void)
 194 {
 195   struct target_ops *t = XZALLOC (struct target_ops);
 196   t->to_shortname = "child";
 197   t->to_longname = "Unix child process";
 198   t->to_doc = "Unix child process (started by the \"run\" command).";
 199   t->to_open = inf_child_open;
 200   t->to_post_attach = inf_child_post_attach;
 201   t->to_post_wait = inf_child_post_wait;
 202   t->to_fetch_registers = inf_child_fetch_inferior_registers;
 203   t->to_store_registers = inf_child_store_inferior_registers;
 204   t->to_prepare_to_store = inf_child_prepare_to_store;
 205   t->to_insert_breakpoint = memory_insert_breakpoint;
 206   t->to_remove_breakpoint = memory_remove_breakpoint;
 207   t->to_terminal_init = terminal_init_inferior;
 208   t->to_terminal_inferior = terminal_inferior;
 209   t->to_terminal_ours_for_output = terminal_ours_for_output;
 210   t->to_terminal_save_ours = terminal_save_ours;
 211   t->to_terminal_ours = terminal_ours;
 212   t->to_terminal_info = child_terminal_info;
 213   t->to_post_startup_inferior = inf_child_post_startup_inferior;
 214   t->to_acknowledge_created_inferior = inf_child_acknowledge_created_inferior;
 215   t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
 216   t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
 217   t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
 218   t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
 219   t->to_follow_fork = inf_child_follow_fork;
 220   t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
 221   t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
 222   t->to_reported_exec_events_per_exec_call =
 223     inf_child_reported_exec_events_per_exec_call;
 224   t->to_can_run = inf_child_can_run;
 225   t->to_enable_exception_callback = inf_child_enable_exception_callback;
 226   t->to_get_current_exception_event = inf_child_get_current_exception_event;
 227   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
 228   t->to_stratum = process_stratum;
 229   t->to_has_all_memory = 1;
 230   t->to_has_memory = 1;
 231   t->to_has_stack = 1;
 232   t->to_has_registers = 1;
 233   t->to_has_execution = 1;
 234   t->to_magic = OPS_MAGIC;
 235   return t;
 236 }