* target.h: Put remote_debug declaration back here. Add baud_rate.

[binutils.git] / gdb / exec.c

diff --git a/gdb/exec.c b/gdb/exec.c
index ca02ae80623426693640819b429c4140bb4d5df4..444c89ebec04c851f9ce9f2ffed3be68d91243da 100644 (file)
--- a/gdb/exec.c
+++ b/gdb/exec.c
@@ -1,28 +1,27 @@
 /* Work with executable files, for GDB. 
 /* Work with executable files, for GDB. 

-   Copyright (C) 1988, 1989 Free Software Foundation, Inc.
+   Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.

 
 This file is part of GDB.
 
 
 This file is part of GDB.
 

-GDB is free software; you can redistribute it and/or modify
+This program is free software; you can redistribute it and/or modify

 it under the terms of the GNU General Public License as published by
 it under the terms of the GNU General Public License as published by

-the Free Software Foundation; either version 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.

 
 

-GDB is distributed in the hope that it will be useful,
+This program is distributed in the hope that it will be useful,

 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License

-along with GDB; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

 
 

-#include <stdio.h>

 #include "defs.h"
 #include "defs.h"

-#include "param.h"

 #include "frame.h"
 #include "inferior.h"
 #include "target.h"
 #include "frame.h"
 #include "inferior.h"
 #include "target.h"

+#include "gdbcmd.h"

 
 #ifdef USG
 #include <sys/types.h>
 
 #ifdef USG
 #include <sys/types.h>


@@ -30,70 +29,123 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #include <sys/param.h>
 #include <fcntl.h>
 
 #include <sys/param.h>
 #include <fcntl.h>

+#include <string.h>

 
 #include "gdbcore.h"
 
 
 #include "gdbcore.h"
 

-#ifdef STILL_NEEDED_FOR_DECSTATION
-#include <sys/dir.h>           /* For DECstations */
-#include <sys/user.h>          /* After a.out.h  */
-#include <sys/file.h>
+#include <ctype.h>
+#include <sys/stat.h>
+#ifndef O_BINARY
+#define O_BINARY 0

 #endif
 
 #endif
 

-#include <sys/stat.h>
+/* Prototypes for local functions */
+
+static void
+add_to_section_table PARAMS ((bfd *, sec_ptr, PTR));
+
+static void
+exec_close PARAMS ((int));
+
+static void
+file_command PARAMS ((char *, int));
+
+static void
+set_section_command PARAMS ((char *, int));
+
+static void
+exec_files_info PARAMS ((struct target_ops *));

 
 

-extern char *getenv();
-extern void child_create_inferior (), child_attach ();
-extern void add_syms_addr_command ();
-extern void symbol_file_command ();
+extern int info_verbose;

 
 /* The Binary File Descriptor handle for the executable file.  */
 
 bfd *exec_bfd = NULL;
 
 
 /* The Binary File Descriptor handle for the executable file.  */
 
 bfd *exec_bfd = NULL;
 

-/* The base and bounds of the table of the exec file's sections.  */
+/* Whether to open exec and core files read-only or read-write.  */

 
 

-struct section_table *exec_sections, *exec_sections_end;
+int write_files = 0;
+
+/* Text start and end addresses (KLUDGE) if needed */
+
+#ifdef NEED_TEXT_START_END
+CORE_ADDR text_start = 0;
+CORE_ADDR text_end   = 0;
+#endif

 
 /* Forward decl */
 
 extern struct target_ops exec_ops;
 
 
 /* Forward decl */
 
 extern struct target_ops exec_ops;
 

-void
+/* ARGSUSED */
+static void

 exec_close (quitting)
      int quitting;
 {
   if (exec_bfd) {
 exec_close (quitting)
      int quitting;
 {
   if (exec_bfd) {

+    char *name = bfd_get_filename (exec_bfd);

     bfd_close (exec_bfd);
     bfd_close (exec_bfd);

+    free (name);

     exec_bfd = NULL;
   }
     exec_bfd = NULL;
   }

+  if (exec_ops.to_sections) {
+    free ((PTR)exec_ops.to_sections);
+    exec_ops.to_sections = NULL;
+    exec_ops.to_sections_end = NULL;
+  }

 }
 
 }
 

+/*  Process the first arg in ARGS as the new exec file.
+
+    Note that we have to explicitly ignore additional args, since we can
+    be called from file_command(), which also calls symbol_file_command()
+    which can take multiple args. */
+

 void
 void

-exec_file_command (filename, from_tty)
-     char *filename;
+exec_file_command (args, from_tty)
+     char *args;

      int from_tty;
 {
      int from_tty;
 {

+  char **argv;
+  char *filename;
+
+  target_preopen (from_tty);

 
   /* Remove any previous exec file.  */
   unpush_target (&exec_ops);
 
   /* Now open and digest the file the user requested, if any.  */
 
 
   /* Remove any previous exec file.  */
   unpush_target (&exec_ops);
 
   /* Now open and digest the file the user requested, if any.  */
 

-  if (filename)
+  if (args)

     {
       char *scratch_pathname;
       int scratch_chan;
       
     {
       char *scratch_pathname;
       int scratch_chan;
       

-      filename = tilde_expand (filename);
+      /* Scan through the args and pick up the first non option arg
+        as the filename. */
+
+      if ((argv = buildargv (args)) == NULL)
+       {
+         nomem (0);
+       }
+      make_cleanup (freeargv, (char *) argv);
+
+      for (; (*argv != NULL) && (**argv == '-'); argv++) {;}
+      if (*argv == NULL)
+       {
+         error ("no exec file name was specified");
+       }
+
+      filename = tilde_expand (*argv);

       make_cleanup (free, filename);
       
       make_cleanup (free, filename);
       

-/* FIXME, if writeable is set, open for read/write. */
-      scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
+      scratch_chan = openp (getenv ("PATH"), 1, filename, 
+                           write_files? O_RDWR|O_BINARY: O_RDONLY|O_BINARY, 0,

                            &scratch_pathname);
       if (scratch_chan < 0)
        perror_with_name (filename);
 
                            &scratch_pathname);
       if (scratch_chan < 0)
        perror_with_name (filename);
 

-      exec_bfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan);
+      exec_bfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);

       if (!exec_bfd)
        error ("Could not open `%s' as an executable file: %s",
               scratch_pathname, bfd_errmsg (bfd_error));
       if (!exec_bfd)
        error ("Could not open `%s' as an executable file: %s",
               scratch_pathname, bfd_errmsg (bfd_error));


@@ -101,38 +153,26 @@ exec_file_command (filename, from_tty)
        error ("\"%s\": not in executable format: %s.",
               scratch_pathname, bfd_errmsg (bfd_error));
 
        error ("\"%s\": not in executable format: %s.",
               scratch_pathname, bfd_errmsg (bfd_error));
 

-#if FIXME
-/* This code needs to be incorporated into BFD */
-#ifdef COFF_ENCAPSULATE
-       /* If we have a coff header, it can give us better values for
-          text_start and exec_data_start.  This is particularly useful
-          for remote debugging of embedded systems.  */
-       if (N_FLAGS(exec_aouthdr) & N_FLAGS_COFF_ENCAPSULATE)
-       {
-               struct coffheader ch;
-               int val;
-               val = lseek (execchan, -(sizeof (AOUTHDR) + sizeof (ch)), 1);
-               if (val == -1)
-                       perror_with_name (filename);
-               val = myread (execchan, &ch, sizeof (ch));
-               if (val < 0)
-                       perror_with_name (filename);
-               text_start = ch.text_start;
-               exec_data_start = ch.data_start;
-       } else
-#endif
-              {
-               text_start =
-                 IS_OBJECT_FILE (exec_aouthdr) ? 0 : N_TXTADDR (exec_aouthdr);
-               exec_data_start = IS_OBJECT_FILE (exec_aouthdr)
-                 ? exec_aouthdr.a_text : N_DATADDR (exec_aouthdr);
-       }
-#endif FIXME
-
-      if (build_section_table (exec_bfd, &exec_sections, &exec_sections_end))
+      if (build_section_table (exec_bfd, &exec_ops.to_sections,
+                               &exec_ops.to_sections_end))

        error ("Can't find the file sections in `%s': %s", 
                exec_bfd->filename, bfd_errmsg (bfd_error));
 
        error ("Can't find the file sections in `%s': %s", 
                exec_bfd->filename, bfd_errmsg (bfd_error));
 

+#ifdef NEED_TEXT_START_END
+      /* This is a KLUDGE (FIXME) because a few places in a few ports
+        (29K springs to mind) need this info for now.  */
+      {
+       struct section_table *p;
+       for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++)
+         if (STREQ (".text", bfd_section_name (p->bfd, p->sec_ptr)))
+           {
+             text_start = p->addr;
+             text_end   = p->endaddr;
+             break;
+           }
+      }
+#endif
+

       validate_files ();
 
       push_target (&exec_ops);
       validate_files ();
 
       push_target (&exec_ops);


@@ -149,7 +189,7 @@ exec_file_command (filename, from_tty)
    What a novelty.  Why did GDB go through four major releases before this
    command was added?  */
 
    What a novelty.  Why did GDB go through four major releases before this
    command was added?  */
 

-void
+static void

 file_command (arg, from_tty)
      char *arg;
      int from_tty;
 file_command (arg, from_tty)
      char *arg;
      int from_tty;


@@ -161,26 +201,35 @@ file_command (arg, from_tty)
 }
 
 \f
 }
 
 \f

-/* Locate all mappable sections of a BFD file.  */
+/* Locate all mappable sections of a BFD file. 
+   table_pp_char is a char * to get it through bfd_map_over_sections;
+   we cast it back to its proper type.  */

 
 

-void
-add_to_section_table (abfd, asect, table_pp)
+static void
+add_to_section_table (abfd, asect, table_pp_char)

      bfd *abfd;
      sec_ptr asect;
      bfd *abfd;
      sec_ptr asect;

-     struct section_table **table_pp;
+     PTR table_pp_char;

 {
 {

+  struct section_table **table_pp = (struct section_table **)table_pp_char;

   flagword aflag;
 
   aflag = bfd_get_section_flags (abfd, asect);
   /* FIXME, we need to handle BSS segment here...it alloc's but doesn't load */
   if (!(aflag & SEC_LOAD))
     return;
   flagword aflag;
 
   aflag = bfd_get_section_flags (abfd, asect);
   /* FIXME, we need to handle BSS segment here...it alloc's but doesn't load */
   if (!(aflag & SEC_LOAD))
     return;

+  if (0 == bfd_section_size (abfd, asect))
+    return;
+  (*table_pp)->bfd = abfd;

   (*table_pp)->sec_ptr = asect;
   (*table_pp)->addr = bfd_section_vma (abfd, asect);
   (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect);
   (*table_pp)++;
 }
 
   (*table_pp)->sec_ptr = asect;
   (*table_pp)->addr = bfd_section_vma (abfd, asect);
   (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect);
   (*table_pp)++;
 }
 

+/* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
+   Returns 0 if OK, 1 on error.  */
+

 int
 build_section_table (some_bfd, start, end)
      bfd *some_bfd;
 int
 build_section_table (some_bfd, start, end)
      bfd *some_bfd;


@@ -189,11 +238,11 @@ build_section_table (some_bfd, start, end)
   unsigned count;
 
   count = bfd_count_sections (some_bfd);
   unsigned count;
 
   count = bfd_count_sections (some_bfd);

-  if (count == 0)
-    abort();   /* return 1? */
+  if (*start)
+    free ((PTR)*start);

   *start = (struct section_table *) xmalloc (count * sizeof (**start));
   *end = *start;
   *start = (struct section_table *) xmalloc (count * sizeof (**start));
   *end = *start;

-  bfd_map_over_sections (some_bfd, add_to_section_table, end);
+  bfd_map_over_sections (some_bfd, add_to_section_table, (char *)end);

   if (*end > *start + count)
     abort();
   /* We could realloc the table, but it probably loses for most files.  */
   if (*end > *start + count)
     abort();
   /* We could realloc the table, but it probably loses for most files.  */


@@ -202,7 +251,7 @@ build_section_table (some_bfd, start, end)
 \f
 /* Read or write the exec file.
 
 \f
 /* Read or write the exec file.
 

-   Args are address within exec file, address within gdb address-space,
+   Args are address within a BFD file, address within gdb address-space,

    length, and a flag indicating whether to read or write.
 
    Result is a length:
    length, and a flag indicating whether to read or write.
 
    Result is a length:


@@ -219,18 +268,17 @@ build_section_table (some_bfd, start, end)
     we just tail-call it with more arguments to select between them.  */
 
 int
     we just tail-call it with more arguments to select between them.  */
 
 int

-xfer_memory (memaddr, myaddr, len, write, abfd, sections, sections_end)
+xfer_memory (memaddr, myaddr, len, write, target)

      CORE_ADDR memaddr;
      char *myaddr;
      int len;
      int write;
      CORE_ADDR memaddr;
      char *myaddr;
      int len;
      int write;

-     bfd *abfd;
-     struct section_table *sections, *sections_end;
+     struct target_ops *target;

 {
   boolean res;
   struct section_table *p;
   CORE_ADDR nextsectaddr, memend;
 {
   boolean res;
   struct section_table *p;
   CORE_ADDR nextsectaddr, memend;

-  boolean (*xfer_fn) ();
+  boolean (*xfer_fn) PARAMS ((bfd *, sec_ptr, PTR, file_ptr, bfd_size_type));

 
   if (len <= 0)
     abort();
 
   if (len <= 0)
     abort();


@@ -239,13 +287,13 @@ xfer_memory (memaddr, myaddr, len, write, abfd, sections, sections_end)
   xfer_fn = write? bfd_set_section_contents: bfd_get_section_contents;
   nextsectaddr = memend;
 
   xfer_fn = write? bfd_set_section_contents: bfd_get_section_contents;
   nextsectaddr = memend;
 

-  for (p = sections; p < sections_end; p++)
+  for (p = target->to_sections; p < target->to_sections_end; p++)

     {
       if (p->addr <= memaddr)
        if (p->endaddr >= memend)
          {
            /* Entire transfer is within this section.  */
     {
       if (p->addr <= memaddr)
        if (p->endaddr >= memend)
          {
            /* Entire transfer is within this section.  */

-           res = xfer_fn (abfd, p->sec_ptr, myaddr, memaddr - p->addr, len);
+           res = xfer_fn (p->bfd, p->sec_ptr, myaddr, memaddr - p->addr, len);

            return (res != false)? len: 0;
          }
        else if (p->endaddr <= memaddr)
            return (res != false)? len: 0;
          }
        else if (p->endaddr <= memaddr)


@@ -257,7 +305,7 @@ xfer_memory (memaddr, myaddr, len, write, abfd, sections, sections_end)
          {
            /* This section overlaps the transfer.  Just do half.  */
            len = p->endaddr - memaddr;
          {
            /* This section overlaps the transfer.  Just do half.  */
            len = p->endaddr - memaddr;

-           res = xfer_fn (abfd, p->sec_ptr, myaddr, memaddr - p->addr, len);
+           res = xfer_fn (p->bfd, p->sec_ptr, myaddr, memaddr - p->addr, len);

            return (res != false)? len: 0;
          }
       else if (p->addr < nextsectaddr)
            return (res != false)? len: 0;
          }
       else if (p->addr < nextsectaddr)


@@ -270,20 +318,6 @@ xfer_memory (memaddr, myaddr, len, write, abfd, sections, sections_end)
     return - (nextsectaddr - memaddr); /* Next boundary where we can help */
 }
 
     return - (nextsectaddr - memaddr); /* Next boundary where we can help */
 }
 

-/* The function called by target_xfer_memory via our target_ops */
-
-int
-exec_xfer_memory (memaddr, myaddr, len, write)
-     CORE_ADDR memaddr;
-     char *myaddr;
-     int len;
-     int write;
-{
-  return xfer_memory (memaddr, myaddr, len, write,
-                     exec_bfd, exec_sections, exec_sections_end);
-}
-
-

 #ifdef FIXME
 #ifdef REG_STACK_SEGMENT
 /* MOVE TO BFD... */
 #ifdef FIXME
 #ifdef REG_STACK_SEGMENT
 /* MOVE TO BFD... */


@@ -297,57 +331,148 @@ exec_xfer_memory (memaddr, myaddr, len, write)
        wanna_xfer = coredata;
       }
 #endif                         /* REG_STACK_SEGMENT */
        wanna_xfer = coredata;
       }
 #endif                         /* REG_STACK_SEGMENT */

-#endif FIXME
+#endif /* FIXME */

 \f
 \f

+void
+print_section_info (t, abfd)
+  struct target_ops *t;
+  bfd *abfd;
+{
+  struct section_table *p;
+
+  printf_filtered ("\t`%s', ", bfd_get_filename(abfd));
+  wrap_here ("        ");
+  printf_filtered ("file type %s.\n", bfd_get_target(abfd));
+  printf_filtered ("\tEntry point: %s\n",
+                  local_hex_string (bfd_get_start_address (exec_bfd)));
+  for (p = t->to_sections; p < t->to_sections_end; p++) {
+    printf_filtered ("\t%s", local_hex_string_custom (p->addr, "08"));
+    printf_filtered (" - %s", local_hex_string_custom (p->endaddr, "08"));
+    if (info_verbose)
+      printf_filtered (" @ %s",
+                      local_hex_string_custom (p->sec_ptr->filepos, "08"));
+    printf_filtered (" is %s", bfd_section_name (p->bfd, p->sec_ptr));
+    if (p->bfd != abfd) {
+      printf_filtered (" in %s", bfd_get_filename (p->bfd));
+    }
+    printf_filtered ("\n");
+  }
+}
+

 static void
 static void

-exec_files_info ()
+exec_files_info (t)
+  struct target_ops *t;
+{
+  print_section_info (t, exec_bfd);
+}
+
+static void
+set_section_command (args, from_tty)
+     char *args;
+     int from_tty;

 {
   struct section_table *p;
 {
   struct section_table *p;

+  char *secname;
+  unsigned seclen;
+  unsigned long secaddr;
+  char secprint[100];
+  long offset;
+
+  if (args == 0)
+    error ("Must specify section name and its virtual address");
+
+  /* Parse out section name */
+  for (secname = args; !isspace(*args); args++) ;
+  seclen = args - secname;
+
+  /* Parse out new virtual address */
+  secaddr = parse_and_eval_address (args);
+
+  for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++) {
+    if (!strncmp (secname, bfd_section_name (exec_bfd, p->sec_ptr), seclen)
+       && bfd_section_name (exec_bfd, p->sec_ptr)[seclen] == '\0') {
+      offset = secaddr - p->addr;
+      p->addr += offset;
+      p->endaddr += offset;
+      if (from_tty)
+       exec_files_info(&exec_ops);
+      return;
+    }
+  } 
+  if (seclen >= sizeof (secprint))
+    seclen = sizeof (secprint) - 1;
+  strncpy (secprint, secname, seclen);
+  secprint[seclen] = '\0';
+  error ("Section %s not found", secprint);
+}

 
 

-  printf ("\tExecutable file `%s'.\n", bfd_get_filename(exec_bfd));
+/* If mourn is being called in all the right places, this could be say
+   `gdb internal error' (since generic_mourn calls mark_breakpoints_out).  */

 
 

-  for (p = exec_sections; p < exec_sections_end; p++)
-    printf("\texecutable from 0x%08x to 0x%08x is %s\n",
-       p->addr, p->endaddr,
-       bfd_section_name (exec_bfd, p->sec_ptr));
+static int
+ignore (addr, contents)
+     CORE_ADDR addr;
+     char *contents;
+{
+  return 0;

 }
 
 struct target_ops exec_ops = {
        "exec", "Local exec file",
 }
 
 struct target_ops exec_ops = {
        "exec", "Local exec file",

+       "Use an executable file as a target.\n\
+Specify the filename of the executable file.",

        exec_file_command, exec_close, /* open, close */
        exec_file_command, exec_close, /* open, close */

-       child_attach, 0, 0, 0, /* attach, detach, resume, wait, */
+       find_default_attach, 0, 0, 0, /* attach, detach, resume, wait, */

        0, 0, /* fetch_registers, store_registers, */
        0, 0, /* fetch_registers, store_registers, */

-       0, 0, 0, /* prepare_to_store, conv_to, conv_from, */
-       exec_xfer_memory, exec_files_info,
-       0, 0, /* insert_breakpoint, remove_breakpoint, */
+       0, /* prepare_to_store, */
+       xfer_memory, exec_files_info,
+       ignore, ignore, /* insert_breakpoint, remove_breakpoint, */

        0, 0, 0, 0, 0, /* terminal stuff */
        0, 0, /* kill, load */
        0, 0, 0, 0, 0, /* terminal stuff */
        0, 0, /* kill, load */

-       add_syms_addr_command,
-       0, 0, /* call fn, lookup sym */
-       child_create_inferior,
+       0, /* lookup sym */
+       find_default_create_inferior,

        0, /* mourn_inferior */
        0, /* mourn_inferior */

+       0, /* can_run */
+       0, /* notice_signals */

        file_stratum, 0, /* next */
        0, 1, 0, 0, 0,  /* all mem, mem, stack, regs, exec */
        file_stratum, 0, /* next */
        0, 1, 0, 0, 0,  /* all mem, mem, stack, regs, exec */

+       0, 0,                   /* section pointers */

        OPS_MAGIC,              /* Always the last thing */
 };
 
 void
 _initialize_exec()
 {
        OPS_MAGIC,              /* Always the last thing */
 };
 
 void
 _initialize_exec()
 {

+  struct cmd_list_element *c;

 
 

-  add_com ("file", class_files, file_command,
-          "Use FILE as program to be debugged.\n\
+  c = add_cmd ("file", class_files, file_command,
+              "Use FILE as program to be debugged.\n\

 It is read for its symbols, for getting the contents of pure memory,\n\
 and it is the program executed when you use the `run' command.\n\
 If FILE cannot be found as specified, your execution directory path\n\
 ($PATH) is searched for a command of that name.\n\
 It is read for its symbols, for getting the contents of pure memory,\n\
 and it is the program executed when you use the `run' command.\n\
 If FILE cannot be found as specified, your execution directory path\n\
 ($PATH) is searched for a command of that name.\n\

-No arg means to have no executable file and no symbols.");
+No arg means to have no executable file and no symbols.", &cmdlist);
+  c->completer = filename_completer;

 
 

-  add_com ("exec-file", class_files, exec_file_command,
+  c = add_cmd ("exec-file", class_files, exec_file_command,

           "Use FILE as program for getting contents of pure memory.\n\
 If FILE cannot be found as specified, your execution directory path\n\
 is searched for a command of that name.\n\
           "Use FILE as program for getting contents of pure memory.\n\
 If FILE cannot be found as specified, your execution directory path\n\
 is searched for a command of that name.\n\

-No arg means have no executable file.");
-
+No arg means have no executable file.", &cmdlist);
+  c->completer = filename_completer;
+
+  add_com ("section", class_files, set_section_command,
+   "Change the base address of section SECTION of the exec file to ADDR.\n\
+This can be used if the exec file does not contain section addresses,\n\
+(such as in the a.out format), or when the addresses specified in the\n\
+file itself are wrong.  Each section must be changed separately.  The\n\
+``info files'' command lists all the sections and their addresses.");
+
+  add_show_from_set
+    (add_set_cmd ("write", class_support, var_boolean, (char *)&write_files,
+                 "Set writing into executable and core files.",
+                 &setlist),
+     &showlist);
+  

   add_target (&exec_ops);
 }
   add_target (&exec_ops);
 }