gdb/inf-child.c

   1 /* Default child (native) target interface, for GDB when running under
   2    Unix.
   3
   4    Copyright (C) 1988-1996, 1998-2002, 2004-2005, 2007-2012 Free
   5    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 3 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, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "regcache.h"
  24 #include "memattr.h"
  25 #include "symtab.h"
  26 #include "target.h"
  27 #include "inferior.h"
  28 #include "gdb_string.h"
  29 #include "inf-child.h"
  30
  31 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  32    for all registers.  */
  33
  34 static void
  35 inf_child_fetch_inferior_registers (struct target_ops *ops,
  36                                     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 target_ops *ops,
  54                                     struct regcache *regcache, int regnum)
  55 {
  56 }
  57
  58 static void
  59 inf_child_post_attach (int pid)
  60 {
  61   /* This version of Unix doesn't require a meaningful "post attach"
  62      operation by a debugger.  */
  63 }
  64
  65 /* Get ready to modify the registers array.  On machines which store
  66    individual registers, this doesn't need to do anything.  On
  67    machines which store all the registers in one fell swoop, this
  68    makes sure that registers contains all the registers from the
  69    program being debugged.  */
  70
  71 static void
  72 inf_child_prepare_to_store (struct regcache *regcache)
  73 {
  74 }
  75
  76 static void
  77 inf_child_open (char *arg, int from_tty)
  78 {
  79   error (_("Use the \"run\" command to start a Unix child process."));
  80 }
  81
  82 static void
  83 inf_child_post_startup_inferior (ptid_t ptid)
  84 {
  85   /* This version of Unix doesn't require a meaningful "post startup
  86      inferior" operation by a debugger.  */
  87 }
  88
  89 static int
  90 inf_child_follow_fork (struct target_ops *ops, int follow_child)
  91 {
  92   /* This version of Unix doesn't support following fork or vfork
  93      events.  */
  94   return 0;
  95 }
  96
  97 static int
  98 inf_child_can_run (void)
  99 {
 100   return 1;
 101 }
 102
 103 static char *
 104 inf_child_pid_to_exec_file (int pid)
 105 {
 106   /* This version of Unix doesn't support translation of a process ID
 107      to the filename of the executable file.  */
 108   return NULL;
 109 }
 110
 111 struct target_ops *
 112 inf_child_target (void)
 113 {
 114   struct target_ops *t = XZALLOC (struct target_ops);
 115
 116   t->to_shortname = "child";
 117   t->to_longname = "Unix child process";
 118   t->to_doc = "Unix child process (started by the \"run\" command).";
 119   t->to_open = inf_child_open;
 120   t->to_post_attach = inf_child_post_attach;
 121   t->to_fetch_registers = inf_child_fetch_inferior_registers;
 122   t->to_store_registers = inf_child_store_inferior_registers;
 123   t->to_prepare_to_store = inf_child_prepare_to_store;
 124   t->to_insert_breakpoint = memory_insert_breakpoint;
 125   t->to_remove_breakpoint = memory_remove_breakpoint;
 126   t->to_terminal_init = terminal_init_inferior;
 127   t->to_terminal_inferior = terminal_inferior;
 128   t->to_terminal_ours_for_output = terminal_ours_for_output;
 129   t->to_terminal_save_ours = terminal_save_ours;
 130   t->to_terminal_ours = terminal_ours;
 131   t->to_terminal_info = child_terminal_info;
 132   t->to_post_startup_inferior = inf_child_post_startup_inferior;
 133   t->to_follow_fork = inf_child_follow_fork;
 134   t->to_can_run = inf_child_can_run;
 135   t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
 136   t->to_stratum = process_stratum;
 137   t->to_has_all_memory = default_child_has_all_memory;
 138   t->to_has_memory = default_child_has_memory;
 139   t->to_has_stack = default_child_has_stack;
 140   t->to_has_registers = default_child_has_registers;
 141   t->to_has_execution = default_child_has_execution;
 142   t->to_magic = OPS_MAGIC;
 143   return t;
 144 }