rdoff/rdx.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2009 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
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  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 /*
  35  * rdx.c        RDOFF Object File loader program
  36  */
  37
  38 /* note: most of the actual work of this program is done by the modules
  39    "rdfload.c", which loads and relocates the object file, and by "rdoff.c",
  40    which contains general purpose routines to manipulate RDOFF object
  41    files. You can use these files in your own program to load RDOFF objects
  42    and execute the code in them in a similar way to what is shown here. */
  43
  44 #include "compiler.h"
  45
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48
  49 #include "rdfload.h"
  50 #include "symtab.h"
  51
  52 typedef int (*main_fn) (int, char **);  /* Main function prototype */
  53
  54 int main(int argc, char **argv)
  55 {
  56     rdfmodule *m;
  57     main_fn code;
  58     symtabEnt *s;
  59
  60     if (argc < 2) {
  61         puts("usage: rdx <rdoff-executable> [params]\n");
  62         exit(255);
  63     }
  64
  65     m = rdfload(argv[1]);
  66
  67     if (!m) {
  68         rdfperror("rdx", argv[1]);
  69         exit(255);
  70     }
  71
  72     rdf_relocate(m);            /* in this instance, the default relocation
  73                                    values will work fine, but they may need changing
  74                                    in other cases... */
  75
  76     s = symtabFind(m->symtab, "_main");
  77     if (!s) {
  78         fprintf(stderr, "rdx: could not find symbol '_main' in '%s'\n",
  79                 argv[1]);
  80         exit(255);
  81     }
  82
  83     code = (main_fn)(size_t) s->offset;
  84
  85     argv++, argc--;             /* remove 'rdx' from command line */
  86
  87     return code(argc, argv);    /* execute */
  88 }