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 int
  91 inf_child_follow_fork (struct target_ops *ops, int follow_child)
  92 {
  93   /* This version of Unix doesn't support following fork or vfork
  94      events.  */
  95   return 0;
  96 }
  97
  98 static int
  99 inf_child_can_run (void)
 100 {
 101   return 1;
 102 }
 103
 104 static char *
 105 inf_child_pid_to_exec_file (int pid)
 106 {
 107   /* This version of Unix doesn't support translation of a process ID
 108      to the filename of the executable file.  */
 109   return NULL;
 110 }
 111
 112 struct target_ops *
 113 inf_child_target (void)
 114 {
 115   struct target_ops *t = XZALLOC (struct target_ops);
 116
 117   t->to_shortname = "child";
 118   t->to_longname = "Unix child process";
 119   t->to_doc = "Unix child process (started by the \"run\" command).";
 120   t->to_open = inf_child_open;
 121   t->to_post_attach = inf_child_post_attach;
 122   t->to_fetch_registers = inf_child_fetch_inferior_registers;
 123   t->to_store_registers = inf_child_store_inferior_registers;
 124   t->to_prepare_to_store = inf_child_prepare_to_store;
 125   t->to_insert_breakpoint = memory_insert_breakpoint;
 126   t->to_remove_breakpoint = memory_remove_breakpoint;
 127   t->to_terminal_init = terminal_init_inferior;
 128   t->to_terminal_inferior = terminal_inferior;
 129   t->to_terminal_ours_for_output = terminal_ours_for_output;
 130   t->to_terminal_save_ours = terminal_save_ours;
 131   t->to_terminal_ours = terminal_ours;
 132   t->to_terminal_info = child_terminal_info;
 133   t->to_post_startup_inferior = inf_child_post_startup_inferior;
 134   t->to_follow_fork = inf_child_follow_fork;
 135   t->to_can_run = inf_child_can_run;
 136   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
 137   t->to_stratum = process_stratum;
 138   t->to_has_all_memory = default_child_has_all_memory;
 139   t->to_has_memory = default_child_has_memory;
 140   t->to_has_stack = default_child_has_stack;
 141   t->to_has_registers = default_child_has_registers;
 142   t->to_has_execution = default_child_has_execution;
 143   t->to_magic = OPS_MAGIC;
 144   return t;
 145 }