100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/* $NetBSD: exec_aout.c,v 1.8 2016/09/21 16:25:41 christos Exp $ */
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/*
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* Copyright (c) 1996 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: exec_aout.c,v 1.8 2016/09/21 16:25:41 christos Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <stdio.h>
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#include <string.h>
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#include "extern.h"
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#if defined(NLIST_AOUT)
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#include <a.out.h>
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#define check(off, size) ((off < 0) || (off + size > mappedsize))
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#define BAD do { rv = -1; goto out; } while (0)
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int
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check_aout(const char *mappedfile, size_t mappedsize)
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{
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const struct exec *execp;
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int rv;
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rv = 0;
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if (check(0, sizeof *execp))
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BAD;
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execp = (const struct exec *)&mappedfile[0];
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if (N_BADMAG(*execp))
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BAD;
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out:
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return (rv);
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}
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int
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findoff_aout(const char *mappedfile, size_t mappedsize, u_long vmaddr,
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size_t *fileoffp, u_long text_start)
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{
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const struct exec *execp;
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int rv;
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rv = 0;
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execp = (const struct exec *)&mappedfile[0];
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if (N_TXTADDR(*execp) + (execp->a_entry & (N_PAGSIZ(*execp)-1)) !=
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execp->a_entry)
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vmaddr += N_TXTADDR(*execp) +
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(execp->a_entry & (N_PAGSIZ(*execp)-1)) - execp->a_entry;
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/* apply correction based on the supplied text start address, if any */
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if (text_start != (unsigned long)~0)
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vmaddr += N_TXTADDR(*execp) - text_start;
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if (N_TXTADDR(*execp) <= vmaddr &&
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vmaddr < (N_TXTADDR(*execp) + execp->a_text))
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*fileoffp = vmaddr - N_TXTADDR(*execp) + N_TXTOFF(*execp);
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else if (N_DATADDR(*execp) <= vmaddr &&
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vmaddr < (N_DATADDR(*execp) + execp->a_data))
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*fileoffp = vmaddr - N_DATADDR(*execp) + N_DATOFF(*execp);
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else
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BAD;
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out:
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return (rv);
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}
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#endif /* NLIST_AOUT */
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