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exec_elf32.c revision 1.8 
      1 /* $NetBSD: exec_elf32.c,v 1.8 2000/06/14 17:26:15 cgd 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *          This product includes software developed for the
     18  *          NetBSD Project.  See http://www.netbsd.org/ for
     19  *          information about NetBSD.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  *
     34  * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #ifndef lint
     39 __RCSID("$NetBSD: exec_elf32.c,v 1.8 2000/06/14 17:26:15 cgd Exp $");
     40 #endif /* not lint */
     41 
     42 #ifndef ELFSIZE
     43 #define	ELFSIZE		32
     44 #endif
     45 
     46 #include <sys/types.h>
     47 #include <stdio.h>
     48 #include <string.h>
     49 #include "extern.h"
     50 
     51 #if defined(NLIST_ELF32) || defined(NLIST_ELF64)
     52 #include <sys/exec_elf.h>
     53 #endif
     54 
     55 #if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \
     56     (defined(NLIST_ELF64) && (ELFSIZE == 64))
     57 
     58 #define	check(off, size)	((off < 0) || (off + size > mappedsize))
     59 #define	BAD			do { rv = -1; goto out; } while (0)
     60 
     61 int
     62 ELFNAMEEND(check)(mappedfile, mappedsize)
     63 	const char *mappedfile;
     64 	size_t mappedsize;
     65 {
     66 	Elf_Ehdr *ehdrp;
     67 	int rv;
     68 
     69 	rv = 0;
     70 
     71 	if (check(0, sizeof *ehdrp))
     72 		BAD;
     73 	ehdrp = (Elf_Ehdr *)&mappedfile[0];
     74 
     75 	if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
     76 	    ehdrp->e_ident[EI_CLASS] != ELFCLASS)
     77 		BAD;
     78 
     79 	switch (ehdrp->e_machine) {
     80 	ELFDEFNNAME(MACHDEP_ID_CASES)
     81 
     82 	default:
     83 		BAD;
     84 	}
     85 
     86 out:
     87 	return (rv);
     88 }
     89 
     90 int
     91 ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp)
     92 	const char *mappedfile;
     93 	size_t mappedsize, *fileoffp;
     94 	u_long vmaddr;
     95 {
     96 	Elf_Ehdr *ehdrp;
     97 	Elf_Shdr *shdrp;
     98 	Elf_Off shdr_off;
     99 	Elf_Word shdr_size;
    100 #if (ELFSIZE == 32)
    101 	Elf32_Half nshdr, i;
    102 #elif (ELFSIZE == 64)
    103 	Elf64_Half nshdr, i;
    104 #endif
    105 	int rv;
    106 
    107 	rv = 0;
    108 
    109 	ehdrp = (Elf_Ehdr *)&mappedfile[0];
    110 	nshdr = ehdrp->e_shnum;
    111 	shdr_off = ehdrp->e_shoff;
    112 	shdr_size = ehdrp->e_shentsize * nshdr;
    113 
    114 	if (check(shdr_off, shdr_size) ||
    115 	    (sizeof *shdrp != ehdrp->e_shentsize))
    116 		BAD;
    117 	shdrp = (Elf_Shdr *)&mappedfile[shdr_off];
    118 
    119 	for (i = 0; i < nshdr; i++) {
    120 		if (shdrp[i].sh_addr <= vmaddr &&
    121 		    vmaddr < (shdrp[i].sh_addr + shdrp[i].sh_size)) {
    122 			*fileoffp = vmaddr -
    123 			    shdrp[i].sh_addr + shdrp[i].sh_offset;
    124 			break;
    125 		}
    126 	}
    127 	if (i == nshdr)
    128 		BAD;
    129 
    130 out:
    131 	return (rv);
    132 }
    133 
    134 #endif /* include this size of ELF */
    135