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exec_elf32.c revision 1.6 
      1 /*	$NetBSD: exec_elf32.c,v 1.6 1999/11/04 02:00:19 erh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Christopher G. Demetriou
     17  *	for the NetBSD Project.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 #ifndef lint
     35 __RCSID("$NetBSD: exec_elf32.c,v 1.6 1999/11/04 02:00:19 erh Exp $");
     36 #endif /* not lint */
     37 
     38 #ifndef ELFSIZE
     39 #define	ELFSIZE		32
     40 #endif
     41 
     42 #include <sys/types.h>
     43 #include <stdio.h>
     44 #include <string.h>
     45 #include "extern.h"
     46 
     47 #if defined(NLIST_ELF32) || defined(NLIST_ELF64)
     48 #include <sys/exec_elf.h>
     49 #endif
     50 
     51 #if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \
     52     (defined(NLIST_ELF64) && (ELFSIZE == 64))
     53 
     54 #define	check(off, size)	((off < 0) || (off + size > mappedsize))
     55 #define	BAD			do { rv = -1; goto out; } while (0)
     56 
     57 int
     58 ELFNAMEEND(check)(mappedfile, mappedsize)
     59 	const char *mappedfile;
     60 	size_t mappedsize;
     61 {
     62 	Elf_Ehdr *ehdrp;
     63 	int rv;
     64 
     65 	rv = 0;
     66 
     67 	if (check(0, sizeof *ehdrp))
     68 		BAD;
     69 	ehdrp = (Elf_Ehdr *)&mappedfile[0];
     70 
     71 	if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
     72 	    ehdrp->e_ident[EI_CLASS] != ELFCLASS)
     73 		BAD;
     74 
     75 	switch (ehdrp->e_machine) {
     76 	ELFDEFNNAME(MACHDEP_ID_CASES)
     77 
     78 	default:
     79 		BAD;
     80 	}
     81 
     82 out:
     83 	return (rv);
     84 }
     85 
     86 int
     87 ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp)
     88 	const char *mappedfile;
     89 	size_t mappedsize, *fileoffp;
     90 	u_long vmaddr;
     91 {
     92 	Elf_Ehdr *ehdrp;
     93 	Elf_Shdr *shdrp;
     94 	Elf_Off shdr_off;
     95 	Elf_Word shdr_size;
     96 #if (ELFSIZE == 32)
     97 	Elf32_Half nshdr, i;
     98 #elif (ELFSIZE == 64)
     99 	Elf64_Half nshdr, i;
    100 #endif
    101 	int rv;
    102 
    103 	rv = 0;
    104 
    105 	ehdrp = (Elf_Ehdr *)&mappedfile[0];
    106 	nshdr = ehdrp->e_shnum;
    107 	shdr_off = ehdrp->e_shoff;
    108 	shdr_size = ehdrp->e_shentsize * nshdr;
    109 
    110 	if (check(shdr_off, shdr_size) ||
    111 	    (sizeof *shdrp != ehdrp->e_shentsize))
    112 		BAD;
    113 	shdrp = (Elf_Shdr *)&mappedfile[shdr_off];
    114 
    115 	for (i = 0; i < nshdr; i++) {
    116 		if (shdrp[i].sh_addr <= vmaddr &&
    117 		    vmaddr < (shdrp[i].sh_addr + shdrp[i].sh_size)) {
    118 			*fileoffp = vmaddr -
    119 			    shdrp[i].sh_addr + shdrp[i].sh_offset;
    120 			break;
    121 		}
    122 	}
    123 	if (i == nshdr)
    124 		BAD;
    125 
    126 out:
    127 	return (rv);
    128 }
    129 
    130 #endif /* include this size of ELF */
    131