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      1 /* $NetBSD: exec_aout.c,v 1.8 2016/09/21 16:25:41 christos Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1996 Christopher G. Demetriou
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  *
     29  * <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __RCSID("$NetBSD: exec_aout.c,v 1.8 2016/09/21 16:25:41 christos Exp $");
     35 #endif /* not lint */
     36 
     37 #include <sys/types.h>
     38 #include <stdio.h>
     39 #include <string.h>
     40 #include "extern.h"
     41 
     42 #if defined(NLIST_AOUT)
     43 #include <a.out.h>
     44 
     45 #define	check(off, size)	((off < 0) || (off + size > mappedsize))
     46 #define	BAD			do { rv = -1; goto out; } while (0)
     47 
     48 int
     49 check_aout(const char *mappedfile, size_t mappedsize)
     50 {
     51 	const struct exec *execp;
     52 	int rv;
     53 
     54 	rv = 0;
     55 
     56 	if (check(0, sizeof *execp))
     57 		BAD;
     58 	execp = (const struct exec *)&mappedfile[0];
     59 
     60 	if (N_BADMAG(*execp))
     61 		BAD;
     62 
     63 out:
     64 	return (rv);
     65 }
     66 
     67 int
     68 findoff_aout(const char *mappedfile, size_t mappedsize, u_long vmaddr,
     69     size_t *fileoffp, u_long text_start)
     70 {
     71 	const struct exec *execp;
     72 	int rv;
     73 
     74 	rv = 0;
     75 	execp = (const struct exec *)&mappedfile[0];
     76 
     77 	if (N_TXTADDR(*execp) + (execp->a_entry & (N_PAGSIZ(*execp)-1)) !=
     78 	    execp->a_entry)
     79 		vmaddr += N_TXTADDR(*execp) +
     80 		    (execp->a_entry & (N_PAGSIZ(*execp)-1)) - execp->a_entry;
     81 
     82 	/* apply correction based on the supplied text start address, if any */
     83 	if (text_start != (unsigned long)~0)
     84 		vmaddr += N_TXTADDR(*execp) - text_start;
     85 
     86 	if (N_TXTADDR(*execp) <= vmaddr &&
     87 	    vmaddr < (N_TXTADDR(*execp) + execp->a_text))
     88 		*fileoffp = vmaddr - N_TXTADDR(*execp) + N_TXTOFF(*execp);
     89 	else if (N_DATADDR(*execp) <= vmaddr &&
     90 	    vmaddr < (N_DATADDR(*execp) + execp->a_data))
     91 		*fileoffp = vmaddr - N_DATADDR(*execp) + N_DATOFF(*execp);
     92 	else
     93 		BAD;
     94 
     95 out:
     96 	return (rv);
     97 }
     98 
     99 #endif /* NLIST_AOUT */
    100