gdb/stuff.c

   1 /* Program to stuff files into a specially prepared space in kdb.
   2    Copyright (C) 1986, 1989, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* Written 13-Mar-86 by David Bridgham. */
  21
  22 #include <stdio.h>
  23 #include <a.out.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <sys/file.h>
  27 #include <varargs.h>
  28
  29 extern char *sys_errlist[];
  30
  31 main (argc, argv)
  32      int argc;
  33      char *argv[];
  34 {
  35   register char *cp;
  36   char *outfile;
  37   register int i;
  38   int offset;
  39   int out_fd, in_fd;
  40   struct stat stat_buf;
  41   int size, pad;
  42   char buf[1024];
  43   static char zeros[4] = {0};
  44
  45   if (argc < 4)
  46     err("Not enough arguments\nUsage: %s -o kdb file1 file2 ...\n",
  47         argv[0]);
  48
  49   outfile = 0;
  50   for (i = 1; i < argc; i++)
  51     {
  52       if (strcmp (argv[i], "-o") == 0)
  53         outfile = argv[++i];
  54     }
  55   if (outfile == 0)
  56     err("Output file not specified\n");
  57
  58   offset = get_offset (outfile, "_heap");
  59
  60   out_fd = open (outfile, O_WRONLY);
  61   if (out_fd < 0)
  62     err ("Error opening %s for write: %s\n", outfile, sys_errlist[errno]);
  63   if (lseek (out_fd, offset, 0) < 0)
  64     err ("Error seeking to heap in %s: %s\n", outfile, sys_errlist[errno]);
  65
  66   /* For each file listed on the command line, write it into the
  67    * 'heap' of the output file.  Make sure to skip the arguments
  68    * that name the output file. */
  69   for (i = 1; i < argc; i++)
  70     {
  71       if (strcmp (argv[i], "-o") == 0)
  72         continue;
  73       if ((in_fd = open (argv[i], O_RDONLY)) < 0)
  74         err ("Error opening %s for read: %s\n", argv[i], sys_errlist[errno]);
  75       if (fstat (in_fd, &stat_buf) < 0)
  76         err ("Error stat'ing %s: %s\n", argv[i], sys_errlist[errno]);
  77       size = strlen (argv[i]);
  78       pad = 4 - (size & 3);
  79       size += pad + stat_buf.st_size + sizeof (int);
  80       write (out_fd, &size, sizeof (int));
  81       write (out_fd, argv[i], strlen (argv[i]));
  82       write (out_fd, zeros, pad);
  83       while ((size = read (in_fd, buf, sizeof (buf))) > 0)
  84         write (out_fd, buf, size);
  85       close (in_fd);
  86     }
  87   size = 0;
  88   write (out_fd, &size, sizeof (int));
  89   close (out_fd);
  90   return (0);
  91 }
  92
  93 /* Read symbol table from file and returns the offset into the file
  94  * where symbol sym_name is located.  If error, print message and
  95  * exit. */
  96 get_offset (file, sym_name)
  97      char *file;
  98      char *sym_name;
  99 {
 100   int f;
 101   struct exec file_hdr;
 102   struct nlist *symbol_table;
 103   int size;
 104   char *strings;
 105
 106   f = open (file, O_RDONLY);
 107   if (f < 0)
 108     err ("Error opening %s: %s\n", file, sys_errlist[errno]);
 109   if (read (f, &file_hdr, sizeof (file_hdr)) < 0)
 110     err ("Error reading exec structure: %s\n", sys_errlist[errno]);
 111   if (N_BADMAG (file_hdr))
 112     err ("File %s not an a.out file\n", file);
 113
 114   /* read in symbol table */
 115   if ((symbol_table = (struct nlist *)malloc (file_hdr.a_syms)) == 0)
 116     err ("Couldn't allocate space for symbol table\n");
 117   if (lseek (f, N_SYMOFF (file_hdr), 0) == -1)
 118     err ("lseek error: %s\n", sys_errlist[errno]);
 119   if (read (f, symbol_table, file_hdr.a_syms) == -1)
 120     err ("Error reading symbol table from %s: %s\n", file, sys_errlist[errno]);
 121
 122   /* read in string table */
 123   if (read (f, &size, 4) == -1)
 124     err ("reading string table size: %s\n", sys_errlist[errno]);
 125   if ((strings = (char *)malloc (size)) == 0)
 126     err ("Couldn't allocate memory for string table\n");
 127   if (read (f, strings, size - 4) == -1)
 128     err ("reading string table: %s\n", sys_errlist[errno]);
 129
 130   /* Find the core address at which the first byte of kdb text segment
 131      should be loaded into core when kdb is run.  */
 132   origin = find_symbol ("_etext", symbol_table, file_hdr.a_syms, strings)
 133     - file_hdr.a_text;
 134   /* Find the core address at which the heap will appear.  */
 135   coreaddr = find_symbol (sym_name, symbol_table, file_hdr.a_syms, strings);
 136   /* Return address in file of the heap data space.  */
 137   return (N_TXTOFF (file_hdr) + core_addr - origin);
 138 }
 139
 140 find_symbol (sym_name, symbol_table, length, strings)
 141      char *sym_name;
 142      struct nlist *symbol_table;
 143      int length;
 144      char *strings;
 145 {
 146   register struct nlist *sym;
 147
 148   /* Find symbol in question */
 149   for (sym = symbol_table;
 150        sym != (struct nlist *)((char *)symbol_table + length);
 151        sym++)
 152       {
 153         if ((sym->n_type & N_TYPE) != N_DATA) continue;
 154         if (sym->n_un.n_strx == 0) continue;
 155         if (strcmp (sym_name, strings + sym->n_un.n_strx - 4) == 0)
 156           return sym->n_value;
 157       }
 158     err ("Data symbol %s not found in %s\n", sym_name, file);
 159 }
 160
 161 /* VARARGS */
 162 void
 163 err (va_alist)
 164      va_dcl
 165 {
 166   va_list args;
 167   char *string;
 168
 169   va_start (args);
 170   string = va_arg (args, char *);
 171   vfprintf (stderr, string, args);
 172   va_end (args);
 173   exit (-1);
 174 }