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