1 /* $NetBSD: exec_elf32.c,v 1.2 1997/10/17 10:28:30 lukem 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 1.2 1997/10/17 10:28:30 lukem 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, Elf_e_ident, Elf_e_siz)) 78 BAD; 79 80 switch (ehdrp->e_machine) { 81 ELFDEFNNAME(MACHDEP_ID_CASES) 82 83 default: 84 BAD; 85 } 86 87 out: 88 return (rv); 89 } 90 91 int 92 ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp) 93 const char *mappedfile; 94 size_t mappedsize, *fileoffp; 95 u_long vmaddr; 96 { 97 Elf_Ehdr *ehdrp; 98 Elf_Shdr *shdrp; 99 Elf_Off shdr_off; 100 Elf_Word shdr_size; 101 #if (ELFSIZE == 32) 102 Elf32_Half nshdr, i; 103 #elif (ELFSIZE == 64) 104 Elf64_Half nshdr, i; 105 #endif 106 int rv; 107 108 rv = 0; 109 110 ehdrp = (Elf_Ehdr *)&mappedfile[0]; 111 nshdr = ehdrp->e_shnum; 112 shdr_off = ehdrp->e_shoff; 113 shdr_size = ehdrp->e_shentsize * nshdr; 114 115 if (check(shdr_off, shdr_size) || 116 (sizeof *shdrp != ehdrp->e_shentsize)) 117 BAD; 118 shdrp = (Elf_Shdr *)&mappedfile[shdr_off]; 119 120 for (i = 0; i < nshdr; i++) { 121 if (shdrp[i].sh_addr <= vmaddr && 122 vmaddr < (shdrp[i].sh_addr + shdrp[i].sh_size)) { 123 *fileoffp = vmaddr - 124 shdrp[i].sh_addr + shdrp[i].sh_offset; 125 break; 126 } 127 } 128 if (i == nshdr) 129 BAD; 130 131 out: 132 return (rv); 133 } 134 135 #endif /* include this size of ELF */ 136