gdb/stuff.c

   1 /* Program to stuff files into a specially prepared space in kdb.
   2    Copyright 1986, 1989, 1991, 1992, 1995, 2000
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 /* Written 13-Mar-86 by David Bridgham. */
  23
  24 #include <stdio.h>
  25 #include <a.out.h>
  26 #include <sys/types.h>
  27 #include "gdb_stat.h"
  28 #include <sys/file.h>
  29 #include <varargs.h>
  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] =
  44   {0};
  45
  46   if (argc < 4)
  47     err ("Not enough arguments\nUsage: %s -o kdb file1 file2 ...\n",
  48          argv[0]);
  49
  50   outfile = 0;
  51   for (i = 1; i < argc; i++)
  52     {
  53       if (STREQ (argv[i], "-o"))
  54         outfile = argv[++i];
  55     }
  56   if (outfile == 0)
  57     err ("Output file not specified\n");
  58
  59   offset = get_offset (outfile, "_heap");
  60
  61   out_fd = open (outfile, O_WRONLY);
  62   if (out_fd < 0)
  63     err ("Error opening %s for write: %s\n", outfile, strerror (errno));
  64   if (lseek (out_fd, offset, 0) < 0)
  65     err ("Error seeking to heap in %s: %s\n", outfile, strerror (errno));
  66
  67   /* For each file listed on the command line, write it into the
  68    * 'heap' of the output file.  Make sure to skip the arguments
  69    * that name the output file. */
  70   for (i = 1; i < argc; i++)
  71     {
  72       if (STREQ (argv[i], "-o"))
  73         continue;
  74       if ((in_fd = open (argv[i], O_RDONLY)) < 0)
  75         err ("Error opening %s for read: %s\n", argv[i],
  76              strerror (errno));
  77       if (fstat (in_fd, &stat_buf) < 0)
  78         err ("Error stat'ing %s: %s\n", argv[i], strerror (errno));
  79       size = strlen (argv[i]);
  80       pad = 4 - (size & 3);
  81       size += pad + stat_buf.st_size + sizeof (int);
  82       write (out_fd, &size, sizeof (int));
  83       write (out_fd, argv[i], strlen (argv[i]));
  84       write (out_fd, zeros, pad);
  85       while ((size = read (in_fd, buf, sizeof (buf))) > 0)
  86         write (out_fd, buf, size);
  87       close (in_fd);
  88     }
  89   size = 0;
  90   write (out_fd, &size, sizeof (int));
  91   close (out_fd);
  92   return (0);
  93 }
  94
  95 /* Read symbol table from file and returns the offset into the file
  96  * where symbol sym_name is located.  If error, print message and
  97  * exit. */
  98 get_offset (char *file, 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, strerror (errno));
 109   if (read (f, &file_hdr, sizeof (file_hdr)) < 0)
 110     err ("Error reading exec structure: %s\n", strerror (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", strerror (errno));
 119   if (read (f, symbol_table, file_hdr.a_syms) == -1)
 120     err ("Error reading symbol table from %s: %s\n", file,
 121          strerror (errno));
 122
 123   /* read in string table */
 124   if (read (f, &size, 4) == -1)
 125     err ("reading string table size: %s\n", strerror (errno));
 126   if ((strings = (char *) malloc (size)) == 0)
 127     err ("Couldn't allocate memory for string table\n");
 128   if (read (f, strings, size - 4) == -1)
 129     err ("reading string table: %s\n", strerror (errno));
 130
 131   /* Find the core address at which the first byte of kdb text segment
 132      should be loaded into core when kdb is run.  */
 133   origin = find_symbol ("_etext", symbol_table, file_hdr.a_syms, strings)
 134     - file_hdr.a_text;
 135   /* Find the core address at which the heap will appear.  */
 136   coreaddr = find_symbol (sym_name, symbol_table, file_hdr.a_syms, strings);
 137   /* Return address in file of the heap data space.  */
 138   return (N_TXTOFF (file_hdr) + core_addr - origin);
 139 }
 140
 141 find_symbol (char *sym_name, struct nlist *symbol_table, int length,
 142              char *strings)
 143 {
 144   register struct nlist *sym;
 145
 146   /* Find symbol in question */
 147   for (sym = symbol_table;
 148        sym != (struct nlist *) ((char *) symbol_table + length);
 149        sym++)
 150     {
 151       if ((sym->n_type & N_TYPE) != N_DATA)
 152         continue;
 153       if (sym->n_un.n_strx == 0)
 154         continue;
 155       if (STREQ (sym_name, strings + sym->n_un.n_strx - 4))
 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 (gdb_stderr, string, args);
 172   va_end (args);
 173   exit (-1);
 174 }