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exec_elf32.c revision 1.5 
      1 /*	$NetBSD: exec_elf32.c,v 1.5 1999/10/25 13:57:12 kleink 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 1.5 1999/10/25 13:57:12 kleink 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	CONCAT(x,y)	__CONCAT(x,y)
     55 #define	ELFNAME(x)	CONCAT(elf,CONCAT(ELFSIZE,CONCAT(_,x)))
     56 #define	ELFNAME2(x,y)	CONCAT(x,CONCAT(_elf,CONCAT(ELFSIZE,CONCAT(_,y))))
     57 #define	ELFNAMEEND(x)	CONCAT(x,CONCAT(_elf,ELFSIZE))
     58 #define	ELFDEFNNAME(x)	CONCAT(ELF,CONCAT(ELFSIZE,CONCAT(_,x)))
     59 
     60 #define	check(off, size)	((off < 0) || (off + size > mappedsize))
     61 #define	BAD			do { rv = -1; goto out; } while (0)
     62 
     63 int
     64 ELFNAMEEND(check)(mappedfile, mappedsize)
     65 	const char *mappedfile;
     66 	size_t mappedsize;
     67 {
     68 	Elf_Ehdr *ehdrp;
     69 	int rv;
     70 
     71 	rv = 0;
     72 
     73 	if (check(0, sizeof *ehdrp))
     74 		BAD;
     75 	ehdrp = (Elf_Ehdr *)&mappedfile[0];
     76 
     77 	if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
     78 	    ehdrp->e_ident[EI_CLASS] != ELFCLASS)
     79 		BAD;
     80 
     81 	switch (ehdrp->e_machine) {
     82 	ELFDEFNNAME(MACHDEP_ID_CASES)
     83 
     84 	default:
     85 		BAD;
     86 	}
     87 
     88 out:
     89 	return (rv);
     90 }
     91 
     92 int
     93 ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp)
     94 	const char *mappedfile;
     95 	size_t mappedsize, *fileoffp;
     96 	u_long vmaddr;
     97 {
     98 	Elf_Ehdr *ehdrp;
     99 	Elf_Shdr *shdrp;
    100 	Elf_Off shdr_off;
    101 	Elf_Word shdr_size;
    102 #if (ELFSIZE == 32)
    103 	Elf32_Half nshdr, i;
    104 #elif (ELFSIZE == 64)
    105 	Elf64_Half nshdr, i;
    106 #endif
    107 	int rv;
    108 
    109 	rv = 0;
    110 
    111 	ehdrp = (Elf_Ehdr *)&mappedfile[0];
    112 	nshdr = ehdrp->e_shnum;
    113 	shdr_off = ehdrp->e_shoff;
    114 	shdr_size = ehdrp->e_shentsize * nshdr;
    115 
    116 	if (check(shdr_off, shdr_size) ||
    117 	    (sizeof *shdrp != ehdrp->e_shentsize))
    118 		BAD;
    119 	shdrp = (Elf_Shdr *)&mappedfile[shdr_off];
    120 
    121 	for (i = 0; i < nshdr; i++) {
    122 		if (shdrp[i].sh_addr <= vmaddr &&
    123 		    vmaddr < (shdrp[i].sh_addr + shdrp[i].sh_size)) {
    124 			*fileoffp = vmaddr -
    125 			    shdrp[i].sh_addr + shdrp[i].sh_offset;
    126 			break;
    127 		}
    128 	}
    129 	if (i == nshdr)
    130 		BAD;
    131 
    132 out:
    133 	return (rv);
    134 }
    135 
    136 #endif /* include this size of ELF */
    137