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      1 /* $NetBSD: exec_ecoff.c,v 1.7 2016/09/21 16:27:55 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_ecoff.c,v 1.7 2016/09/21 16:27:55 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_ECOFF)
     43 #include <sys/exec_ecoff.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_ecoff(const char *mappedfile, size_t mappedsize)
     50 {
     51 	const struct ecoff_exechdr *exechdrp;
     52 	int rv;
     53 
     54 	rv = 0;
     55 
     56 	if (check(0, sizeof *exechdrp))
     57 		BAD;
     58 	exechdrp = (const struct ecoff_exechdr *)&mappedfile[0];
     59 
     60 	if (ECOFF_BADMAG(exechdrp))
     61 		BAD;
     62 
     63 out:
     64 	return (rv);
     65 }
     66 
     67 int
     68 findoff_ecoff(const char *mappedfile, size_t mappedsize, u_long vmaddr,
     69     size_t *fileoffp, u_long text_address)
     70 {
     71 	const struct ecoff_exechdr *exechdrp;
     72 	int rv;
     73 
     74 	rv = 0;
     75 	exechdrp = (const struct ecoff_exechdr *)&mappedfile[0];
     76 
     77 	if (exechdrp->a.text_start <= vmaddr &&
     78 	    vmaddr < (exechdrp->a.text_start + exechdrp->a.tsize))
     79 		*fileoffp = vmaddr - exechdrp->a.text_start +
     80 		    ECOFF_TXTOFF(exechdrp);
     81 	else if (exechdrp->a.data_start <= vmaddr &&
     82             vmaddr < (exechdrp->a.data_start + exechdrp->a.dsize))
     83 		*fileoffp = vmaddr - exechdrp->a.data_start +
     84 		    ECOFF_DATOFF(exechdrp);
     85 	else
     86 		BAD;
     87 
     88 out:
     89 	return (rv);
     90 }
     91 
     92 #endif /* NLIST_ECOFF */
     93