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      1 /* $NetBSD: exec_coff.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_coff.c,v 1.7 2016/09/21 16:27:55 christos Exp $");
     35 #endif /* not lint */
     36 
     37 #include <sys/param.h>
     38 #include <sys/time.h>
     39 #include <sys/proc.h>
     40 #include <sys/types.h>
     41 #include <stdio.h>
     42 #include <string.h>
     43 #include "extern.h"
     44 
     45 #if defined(NLIST_COFF)
     46 #include <sys/exec_coff.h>
     47 
     48 #define	check(off, size)	((off < 0) || (off + size > mappedsize))
     49 #define	BAD			do { rv = -1; goto out; } while (0)
     50 
     51 int
     52 check_coff(const char *mappedfile, size_t mappedsize)
     53 {
     54 	const struct coff_exechdr *exechdrp;
     55 	int rv;
     56 
     57 	rv = 0;
     58 
     59 	if (check(0, sizeof *exechdrp))
     60 		BAD;
     61 	exechdrp = (const struct coff_exechdr *)&mappedfile[0];
     62 
     63 	if (COFF_BADMAG(&(exechdrp->f)))
     64 		BAD;
     65 
     66 out:
     67 	return (rv);
     68 }
     69 
     70 int
     71 findoff_coff(const char *mappedfile, size_t mappedsize, u_long vmaddr,
     72     size_t *fileoffp, u_long text_addr)
     73 {
     74 	const struct coff_exechdr *exechdrp;
     75 	int rv;
     76 
     77 	rv = 0;
     78 	exechdrp = (const struct coff_exechdr *)&mappedfile[0];
     79 
     80 #define COFF_TXTOFF_XXX(fp, ap) \
     81          (COFF_ROUND(COFF_HDR_SIZE + (fp)->f_nscns * \
     82 		    sizeof(struct coff_scnhdr), \
     83 		     COFF_SEGMENT_ALIGNMENT(fp, ap)))
     84 
     85 #define COFF_DATOFF_XXX(fp, ap) \
     86         (COFF_TXTOFF_XXX(fp, ap) + (ap)->a_tsize)
     87 
     88 	if ((u_long)exechdrp->a.a_tstart <= vmaddr &&
     89 	    vmaddr < (u_long)(exechdrp->a.a_tstart + exechdrp->a.a_tsize))
     90 		*fileoffp = vmaddr - exechdrp->a.a_tstart +
     91 		    COFF_TXTOFF(&exechdrp->f, &(exechdrp->a));
     92 	else if ((u_long)exechdrp->a.a_dstart <= vmaddr &&
     93             vmaddr < (u_long)(exechdrp->a.a_dstart + exechdrp->a.a_dsize))
     94 		*fileoffp = vmaddr - exechdrp->a.a_dstart +
     95 		    COFF_DATOFF_XXX(&exechdrp->f, &(exechdrp->a));
     96 	else
     97 		BAD;
     98 
     99 out:
    100 	return (rv);
    101 }
    102 
    103 #endif /* NLIST_COFF */
    104